TWI734717B - Absorbent articles - Google Patents

Abstract

The present invention is an absorbent article provided with a front sheet (12) comprising a composite sheet, a back sheet (13) and an absorbent body (14) arranged between the two sheets, and the composite sheet (10) has an edge The first direction (X) in the longitudinal direction of the article and the second direction (Y) in the width direction of the article, and the laminated first sheet (1) and second sheet (2) are partially joined to form a plurality of joints Part, the first sheet (1) protrudes away from the second sheet (2) at parts other than the joints (31, 32, 33), and is formed with a convex part protruding toward the wearer's skin side, The composite sheet (10) has a central area (M) and a pair of side areas (S, S) with convex portions formed in different patterns, and the convex portion (41) with the largest height in the central area (M) The height is higher than the convex part (41') with the largest height in the side area (S), and the compression deformation of the central area (M) is greater than that of the side area (S).

Description

Absorbent articles

The invention relates to absorbent articles such as disposable diapers, menstrual sanitary napkins, and incontinence pads.

Previously, as front sheets of absorbent articles such as disposable diapers, menstrual napkins, and incontinence pads, it has been known that the skin side facing the wearer's skin is formed with uneven shapes by embossing or the like. In addition, a technique is also known that forms a concave-convex shape on the skin side of the front sheet to reduce the contact area with the wearer's skin, thereby improving air permeability or reducing stickiness to the skin.

From the viewpoint of improving the air permeability or reducing the stickiness of the skin, the concave-convex shape of the front sheet is preferably higher in shape retention. However, in general, if the shape retention is to be improved, the texture (feel on the skin) is deteriorated, or the introduction of the liquid from the surface of the front sheet to the absorber side is reduced.

In Patent Documents 1 and 2, it is described that a surface sheet of a disposable diaper is provided with a plurality of uneven regions having different shapes or heights of the protrusions.

As a representative form of an absorbent article, there are those provided with a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorber arranged in the longitudinal direction between the two sheets. As an absorber, a liquid-retaining absorbent core containing an absorbent material such as wood pulp or a water-absorbent polymer is generally used as the main body, and there are also those that further contain paper, non-woven fabric, etc. covering the absorbent core.

As the front sheet of absorbent articles, it is known that there is a skin pair facing the wearer’s skin. The facing surface is formed with uneven shapes by pressing processing such as embossing. In addition, the following technology is also known, that is, by forming a concave-convex shape on the skin facing surface of the front sheet, the contact area with the wearer's skin is reduced, and the air permeability is improved or the stickiness to the skin is reduced. sex. For example, in Patent Document 2, a non-woven fabric having a concavo-convex shape that can be used for a surface sheet of an absorbent article is described in the provision of ridges and grooves extending in one direction perpendicular to the one direction. The non-woven fabric with patterns arranged alternately in the direction forms a plurality of regions with different heights of the bulges, and the diameter of the constituent fibers in the regions where the height of the bulges is relatively high in the plural regions is relatively larger than the height of the bulges The diameter of the constituent fibers in the low area is small. Furthermore, Patent Document 2 focuses on the easy production of such a non-woven fabric with partially different uneven patterns as the main subject, and does not specifically describe the use form or effect of the non-woven fabric.

In addition, as an absorbent core of an absorbent article, a block-shaped absorbent core provided with a groove-shaped space extending in a plane direction is known. Because of its structure, the block-shaped absorbent core system is easy to deform softly with respect to external forces, so it is adapted to the body of the body that deforms with complex undulating skin and abuts with a surface without gaps, or fits the wearer's body The movement to deform and maintain the state in which the face is in contact with the skin surface is excellent in action followability. For example, in Patent Document 3, it is described that the central region in the width direction of the longitudinal block-shaped absorbent core is formed with a low rigidity region including a block region so as to extend in the longitudinal direction. The low-rigidity area forms a high-rigidity area including non-block areas on the left and right sides. Furthermore, in Patent Document 3, there is no description of using a surface sheet having a concave-convex shape together with a block-shaped absorbent core.

[Prior Technical Literature] [Patent Literature]

[Patent Document 1] Japanese Patent Laid-Open No. 2009-136349

[Patent Document 2] Japanese Patent Laid-Open No. 2012-214938

[Patent Document 3] Japanese Patent Laid-Open No. 2013-255566

The present invention (first invention) is an absorbent article provided with a front sheet including a composite sheet, a back sheet, and an absorber arranged between the two sheets. The composite sheet has a first direction along the longitudinal direction of the article and a second direction along the width direction of the article, and the laminated first sheet and second sheet are partially joined to form a plurality of joints, the first sheet A part other than the above-mentioned joint part protrudes in a direction away from the second sheet material to form a convex part protruding toward the wearer's skin side. The composite sheet has a central area in which the protrusions are formed in mutually different patterns and a pair of side areas located on both sides of the central area. The protrusion with the largest height in the central area is the first central protrusion. The height is higher than that of the convex portion having the largest height in the side portion region, that is, the first side portion convex portion, and the compression deformation amount of the central region is greater than the compression deformation amount of the side portion region.

The present invention (the second invention) includes an absorbent body provided with an absorbent core containing an absorbent material, and a front material arranged on the skin facing side of the absorbent body, and has a longitudinal direction corresponding to the front and back direction of the wearer And the horizontal absorbent article orthogonal to it. The absorbent body has: a low-rigidity core region, which is located at the center of the absorptive core in the transverse direction and extends in the longitudinal direction; The core has a low rigidity area. The front material has a low rigidity area of the front material and a high rigidity area of the front material, and the high rigidity area of the front material and the high rigidity area of the core are overlapped in a plan view, and the low rigidity area of the front material is overlapped with the core in a plan view. The low-rigidity areas overlap and extend in the longitudinal direction, and the high-rigidity areas of the front material are located on both lateral sides of the low-rigidity areas of the front material and have higher rigidity than the low-rigidity areas of the front material. The absorbent article of the first invention preferably includes all or part of the constituent elements of the absorbent article of the second invention, or all or part of the absorbent article of the following embodiments. The longitudinal direction in the second invention is equivalent to the article longitudinal direction in the first invention, and the longitudinal direction in the second invention The horizontal direction corresponds to the article width direction in the first invention.

1: The first sheet

1F: Ventral

1M: Lower crotch

1R: dorsal part

2: The second sheet

2H: High rigidity area of the front material

2L: Low rigidity area of front material

2S: Side edge

4: Convex

5: Side sheet

6: Velcro

7: Fixed area

10: Composite sheet

11a: Convex

12: Front sheet

13: Back sheet

14: Absorber

14a: Absorbent core

14b: package chip material

15: Sheets for forming three-dimensional folds

15a: Elastic member

16: leg elastic member

17: Velcro

17a: With base material

17b: Fixed part

17c: Fixed part

18: buckle area

19: Elastic member

19s: elastic sheet

20: The first sheet

21: The second sheet

25: recess

26: Convex

26H: Convex

26L: Convex

27: Continuous convex

27A: Small convex

27B: Small convex

28: Junction

30: Joint group

31: The first joint

32: The second junction

33: 3rd junction

34: Joint pair

40: Central continuous convex

40a: The opposite side of the skin

40b: Non-skin facing side

40A: Absorbent core

40H: High rigidity area of the core

40L: core low rigidity area

40V: continuous hollow part

41: The first convex part in the center

41': 1st convex part on the side

42: Central second convex part

43: The third convex part in the center

43V: cavity

44: 4th convex part

44': Tiny convexity

45: package chip material

50: Elastic member

51: Elastic member

100: disposable diapers

102: front sheet

103: back sheet

111: Roll 1

112: Roll 2

113: The first hot roller

114: The second hot roller

140: Absorbent core

141: Groove

142: Low base weight

143: High Basis Weight

200: disposable diapers

A: Ventral

B: dorsal part

B1: Top part

B2: nearby part

BM: Elastic member configuration area

C: Lower crotch

Da, Db: the direction that crosses the second direction Y

E: Embossed area

H1: Height of the first convex part 41 in the center

H1': The height of the first protrusion 41' on the side

H2: Height of convex part 42

H3: Height of convex part 43

H4: Height of protrusion 46

H4': the height of the convex part 44'

K: Near the root of the convex part

L1: The length of the first joint 31 along the second direction Y

L2: The length of the second joint 32 along the second direction Y

L3: The first imaginary straight line

L4: The second imaginary straight line

L41: Length of the central first protrusion 41

L42: The length of the second central protrusion 42

La: first interval

Lb: second interval

M: Central area

N: non-embossed area

P1: The width of the central continuous convex portion 40 in the elastic member arrangement area BM

P2: Interval between elastic member 19

P3: The interval between the central portions of the central continuous convex portion 40

P4: Pitch

P5: Pitch

P6: The distance between continuous convex parts 27

R: 2nd direction junction row

R1: No. 1 joint row

R2: The second joint row

R3: The first joint row in the second direction

R4: The second joint row in the second direction

R5: 3rd direction junction row

R6: 4th direction junction row

S: side area

T: rotation direction

U: Arrow

V: Arrow

W: width

X: 1st direction

Xa: the length of the article

Y: 2nd direction

Ya: Item width direction

θ: Angle

Fig. 1 is a plan view showing the basic structure of a disposable diaper as an embodiment of the absorbent article of the present invention (first invention).

Fig. 2 is a cross-sectional view taken along line II-II of Fig. 1;

Fig. 3 is a plan view showing the front sheet of the disposable diaper of the first embodiment.

Fig. 4 is an enlarged perspective view showing a part of the central area of the composite sheet used in the first embodiment.

Fig. 5 is an enlarged perspective view showing a part of the side area of the composite sheet used in the first embodiment.

Fig. 6 is an explanatory diagram of the effect of the present invention (first invention), Fig. 6(a) is a schematic cross-sectional view in the width direction of the front sheet (composite sheet) in a non-pressurized state, and Fig. 6(b) is when worn A cross-sectional view in the width direction of the front sheet (composite sheet) in the pressurized state.

Fig. 7 is a schematic diagram showing a state where the fiber density near the root of the central first convex portion is increased by pressure.

Fig. 8 is an enlarged plan view showing a part of the central area of the composite sheet used in the first embodiment.

Fig. 9(a) is a cross-sectional view taken along line Va-Va in Fig. 8, Fig. 9(b) is a cross-sectional view taken along line Vb-Vb in Fig. 8, and Fig. 9(c) is a cross-sectional view taken along line Vc-Vc in Fig. 8.

Fig. 10 is an enlarged plan view showing a part of the side region of the composite sheet used in the first embodiment.

Fig. 11 is a cross-sectional view taken along the line Vd-Vd in Fig. 10;

Figure 12 shows the arrangement of elastic members formed on the back side of the disposable diaper of the first embodiment A schematic top view of the preferred arrangement of the central continuous convex portion and the elastic member in the placement area.

FIG. 13 is a schematic diagram showing a device that can be preferably used for the production of the composite sheet shown in FIG. 3.

Fig. 14 is a view obtained by unfolding the state where the convex portion of the second roller is meshed with the peripheral surface of the central region forming portion of the first roller into a plane.

Fig. 15 is a view obtained by unfolding the state where the convex portion of the second roller is meshed with the peripheral surface of the side region forming portion of the first roller into a plane.

Fig. 16 is a plan view schematically showing the skin-facing surface of the disposable diaper as one embodiment of the absorbent article of the present invention (the second invention), that is, the front sheet side, and the elastic members of each part are expanded and unfolded A top view of a flat unfolded state.

Fig. 17 is a cross-sectional view schematically showing the section along the line I-I in Fig. 16.

Fig. 18 is a plan view schematically showing a part of the skin facing surface of the front sheet of the diaper shown in Fig. 16.

Fig. 19 is a perspective view schematically showing a part of the low-rigidity area of the front material of the front sheet of the diaper shown in Fig. 16 in an enlarged manner.

Fig. 20 is a perspective view schematically showing a part of the high rigidity area of the front material of the front sheet of the diaper shown in Fig. 16 in an enlarged manner.

Fig. 21 is a plan view schematically showing the skin-facing surface of the absorbent core of another embodiment of the absorbent article of the present invention (second invention).

Patent Document 1 discloses a technique for preventing leakage by controlling the diffusion direction of the liquid in the horizontal direction by a convex portion, and does not mention a structure that improves both air permeability and liquid introduction. Patent Document 2 also fails to disclose a structure that improves both air permeability and liquid introduction.

The present invention (first invention) relates to an absorbent article that can eliminate the above-mentioned disadvantages of the prior art.

Hereinafter, the present invention (first invention) will be described based on its preferred embodiments with reference to the drawings.

Fig. 1 and Fig. 2 show the basic structure of a disposable diaper 100 (hereinafter, also simply referred to as diaper 100) as an embodiment of the absorbent article of the present invention (first invention).

The diaper 100 is equipped with the liquid-permeable front sheet 12, the liquid-impermeable back sheet 13, and the absorber 14 arrange|positioned between the two sheets 12 and 13 as shown in FIG. 1 and FIG. Regarding the back sheet 13, the so-called liquid impermeability system also includes the concept of impermeability to liquids. In addition to the case where the back sheet 13 does not allow liquid to pass through at all, it also includes the case where a water-repellent sheet or the like is included.

The diaper 100 has: the article length direction Xa, which is the same direction as the wearer's front and back direction when worn; The longitudinal direction Xa is orthogonal. In addition, the diaper 100 has an ventral portion A arranged on the wearer's ventral side when worn, a dorsal portion B arranged on the wearer's back side when worn, and a ventral portion A located in the article length direction Xa. The lower part of the crotch C between and the dorsal part B. The diaper 100 is an unfolded disposable diaper. The side edges of the back side B are provided with hook and loop fasteners 17 and the outer surface of the ventral side A is provided with a fastening area 18 for fixing the hook and loop fasteners 17.

The absorber 14 in the diaper 100 includes an absorptive core 14a and an core-covering material 14b that wraps the absorptive core 14a. The absorbent core 14a may be composed of, for example, a fiber accumulation of liquid-absorbent fibers such as pulp fibers, or a mixed fiber accumulation of liquid-absorbent fibers and a water-absorbent polymer. Examples of liquid-absorbent fibers include cellulose-based hydrophilic fibers such as pulp fibers, rayon fibers, cotton fibers, and cellulose acetate. In addition to cellulose-based hydrophilic fibers, a fiber containing synthetic resins such as polyolefin, polyester, and polyamide may be hydrophilized with a surfactant or the like. As corespun For the sheet 14b, for example, toilet paper or a water-permeable nonwoven fabric can be used. The core covering material 14b can wrap the entire absorbent core 14a with one sheet, or can wrap the absorbent core 14a in combination with two or more sheets. As the back sheet 13, a liquid-impermeable or water-repellent resin film, a laminate sheet of a resin film and a non-woven fabric, or the like can be used.

On both sides of the article length direction Xa of the diaper 100, three-dimensional wrinkle forming sheets 15 with elastic members 15a are arranged. By contraction of the elastic members 15a, the lower part C of the crotch in the wearing state is formed facing the wearer Three-dimensional folds on the side of the skin. In addition, in the lower part C of the crotch, the leg elastic member 16 is arranged in an extended state, and the elastic member 16 of the leg is arranged in a stretched state, and by its contraction, the lower part C of the crotch in the wearing state is formed to enhance the fit around the wearer's legs. Sex leg folds.

The hook and loop fastener 17 in the diaper 100 includes a tape base material 17a and a male member of a mechanical surface fastener joined to the tape substrate 17a to form a fixed portion 17c. The fastening area 18 is connected to the mechanical surface fastener element The mother member or a non-woven fabric with rich fastening properties is formed on the back sheet 13. A part of the tape base material 17a of the hook and loop tape 17 is formed in a fixing portion 17b that is fixed in a state of being sandwiched between the back sheet 13 and the three-dimensional wrinkle forming sheet 15. A plurality of elastic members 19 that shrink the diaper 100 in the width direction are arranged at intervals between the left and right hook and loop fasteners 17 and 17 in the longitudinal direction Xa of the diaper. The plurality of elastic members 19 are arranged in a manner of an elastic sheet 19s fixed between two non-woven fabrics or non-woven fabrics folded in two, the end of the elastic sheet 19s or the elastic members 19 included in the elastic sheet 19s The end portion preferably overlaps with the fixed portion 17b. Furthermore, the fixing portion 17c of the hook and loop fastener 17 may also be an adhesive portion formed by applying an adhesive to the tape base material 17a. As the tape base material 17a, various known materials such as nonwoven fabric can be used.

The front sheet 12 in the disposable diaper 100 of the first embodiment is composed of the composite sheet 10 shown in FIG. 3.

As shown in FIG. 3, the composite sheet 10 has Xa along the length direction of the diaper 100 (the article length direction) The first direction X and the second direction Y along the width direction (article width direction) Ya of the diaper 100. In addition, as shown in FIG. 3, the composite sheet 10 has a central area M in which convex portions 4 are formed in different patterns and a pair of side areas S and S located on both sides of the central area M. The central area M is located at the center of the width direction (article width direction) Ya of the diaper 100, and a pair of side areas S and S are formed on the outside of both side edges of the central area M in the second direction Y. The central area M and the side areas S, S on both sides of the convex portion 4 formed in mutually different patterns are preferably formed at least on the lower part C of the crotch in the longitudinal direction Xa of the diaper 100, and preferably It is formed from the lower part of the crotch C and either or both of the ventral part A and the back part B, or is formed across the entire length of the absorbent body 14, and preferably spans the entire length of the diaper 100 form.

FIG. 4 shows a perspective view showing a part of the central region M of the composite sheet 10 enlarged, and FIG. 5 shows a perspective view showing a part of the side region S of the composite sheet 10 enlarged. The side regions S are formed at symmetrical positions with respect to the center line (not shown) in the longitudinal direction Xa of the diaper 100. Each of the side regions S is formed with unevenness in the pattern shown in FIG. 5 .

As shown in FIGS. 4 and 5, the composite sheet 10 is located in either of the central area M and the side area S, and the first sheet 1 and the second sheet 2 are laminated by embossing. A plurality of joints are formed by joining locally, and the first sheet 1 protrudes away from the second sheet 2 at locations other than the joints, and a convex part protruding toward the wearer's skin is formed. The composite sheet 10 is located in either of the central region M and the side region S, and both have a substantially flat surface on the second sheet 2 side, and large undulations are formed on the first sheet 1 side.

The first sheet 1 and the second sheet 2 are made of sheet materials. As the sheet material, for example, fiber sheets such as non-woven fabrics, woven fabrics, and woven fabrics, or films, etc. can be used. From the viewpoint of skin touch and the like, fiber sheets are preferably used, and non-woven fabrics are particularly preferred. Sheets constituting the first sheet 1 and the second sheet 2 The types of materials can be the same or different.

Examples of non-woven fabrics in the case of using non-woven fabrics as the sheet materials constituting the first sheet 1 and the second sheet 2 include: Needle punched non-woven fabrics, etc. A laminate obtained by combining two or more kinds of these nonwoven fabrics, or a laminate obtained by combining these nonwoven fabrics and films, etc. can also be used. Among them, it is preferable to use hot-air non-woven fabric or spun-bonded non-woven fabric. The basis weight of the non-woven fabric used as the sheet material constituting the first sheet 1 and the second sheet 2 is preferably 10 g/m ² or more, more preferably 15 g/m ² or more, and more preferably 40 g/m ² Or less, more preferably 35 g/m ² or less. The basis weight of the nonwoven fabric is preferably 10 g/m ² or more and 40 g/m ² or less, and more preferably 15 g/m ² or more and 35 g/m ² or less.

As the fibers constituting the nonwoven fabric, fibers containing various thermoplastic resins can be used. Examples of thermoplastic resins include polyolefins such as polyethylene or polypropylene, polyesters such as polyethylene terephthalate, polyamides such as nylon 6 or nylon 66, polyacrylic acid, polyalkyl acrylate, and polyvinyl chloride. , Polyvinylidene chloride, etc. These resins can be used individually by 1 type or as a blend of 2 or more types. In addition, it can be used in the form of composite fibers such as a core-sheath type or a side by side type.

The composite sheet 10 has the central first convex portion 41 as the convex portion with the largest height in the central region M, and has the side first convex portion 41 ′ as the convex portion with the largest height in the side region S. Moreover, the height of the center first convex portion 41 is higher than the side first convex portion 41'. In addition, the amount of compressive deformation of the central area M having the central first convex portion 41 is greater than that of the side area S having the side first convex portion 41'.

By making the height of the central first convex portion 41 higher than the height of the side first convex portion 41', and the compression deformation amount of the central region M having the central first convex portion 41 is greater than that of the side first convex portion 41' According to the disposable diaper 100 of the first embodiment, the following effects can be exerted by the amount of compression deformation of the side region S.

That is, as shown in Fig. 6, if the diaper 100 is worn, the pressure from the wearer’s skin When the composite sheet 10 is pressurized by the force, the height of the central first convex portion 41 in the central area M near the liquid discharge portion of the wearer is higher than the side first convex portion 41', and is used as the central area The amount of compression deformation of M is greater than the amount of compression deformation of the side area S, and as shown in Fig. 6(b) and Fig. 7, the vicinity of the top portion is softly deformed to reflect a good skin touch. On the other hand, the convex portion 41 has a The fiber density of K near the root becomes higher by compression. Therefore, by arranging the central region M at a location arranged near the wearer's liquid discharge portion to form a plurality of points for rapidly absorbing liquid, a diaper 100 with excellent absorption performance can be obtained.

On the other hand, by making the height of the side first convex portion 41' formed in the side region S lower than that of the central first convex portion 41, and the amount of compression deformation of the side regions S and S is also smaller than that of the central region M Even if the composite sheet 10 is pressurized due to the pressure from the wearer’s skin, it is relatively difficult to be crushed, and the contact area with the skin can be maintained relatively stably. Therefore, the air permeability of the diaper 100 is improved, and the stuffiness can be suppressed more effectively.

Due to this effect, the disposable diaper 100 of the first embodiment is excellent in both air permeability and liquid introduction.

From the viewpoint of more reliably exerting this effect, the height H1 of the central first convex portion 41 [refer to FIG. 9(a)] is relative to the height H1' of the side first convex portion 41' [refer to FIG. 11]. Preferably it is 105% or more, more preferably 110% or more, more preferably 200% or less, still more preferably 150% or less, more preferably 105% or more and 200% or less, and still more preferably 110 % Above and below 150%.

In addition, the height H1 of the central first convex portion 41 is preferably 0.5 mm or more, more preferably 1 mm or more, more preferably 5 mm or less, still more preferably 4 mm or less, and more preferably 0.5 mm or more and 5 mm Below, it is more preferable that it is 1 mm or more and 4 mm or less.

In addition, the height H1' of the side first convex portion 41' is preferably 0.3 mm or more, more preferably 0.6 mm Above, it is more preferably 4 mm or less, more preferably 3 mm or less, more preferably 0.3 mm or more and 4 mm or less, and still more preferably 0.6 mm or more and 3 mm or less.

In addition, the difference between the height H1 of the central first convex portion 41 and the height H1' of the side first convex portion 41' is based on the premise that the above-mentioned height H1>the above-mentioned height H1', and is preferably 0.1 mm or more, and more preferably It is 0.2 mm or more, more preferably 2 mm or less, more preferably 1 mm or less, more preferably 0.1 mm or more and 2 mm or less, and still more preferably 0.2 mm or more and 1 mm or less.

Regarding the convex portion 4 of the composite sheet 10, the so-called height refers to the distance from the lower surface of the second sheet 2 facing the absorber 14 side to the upper surface of the first sheet 1 forming the top of the convex portion 4.

The amount of compression deformation of the central region M and the amount of compression deformation of the side regions are measured as follows.

〔Method of measuring compression deformation〕

The sample is cut into a specific size, and after measuring the thickness in a state where the measurement site is pressurized at 0.1 kPa, the thickness is measured in a state where the pressure is applied at 2.0 kPa. The difference obtained by subtracting the thickness measured at 2.0 kPa from the thickness measured at 0.1 kPa was used as the amount of compression deformation.

The measurement part is set to any 3 points or more per one piece, and the thickness is calculated|required by the average of 2 samples (6 points or more of the measurement part).

As a sample for measurement, two samples cut from two front sheets (composite sheets) were used. The measurement location is for each of the center area and the left and right side areas of each sample, and set to any three locations. above.

Place a 20mm×30mm rectangular flat plate on each measurement location, and measure the thickness under a load of 2.0kPa and the thickness under a load of 0.1kPa for each measurement location.

The so-called thickness here refers to the central region M including a plurality of central first convex portions 41, or The thickness of the side region S including a plurality of side first convex portions 41'.

Then, for each measurement site, the thickness under a load of 0.1 kPa was subtracted from the thickness under a load of 2.0 kPa to calculate the thickness difference.

Regarding the central region M, the average value of the above-mentioned thickness differences for the measurement locations of 6 or more locations in total is set as the amount of compression deformation of the central first convex portion 41, and the left and right side regions S are 12 or more locations in total. The average value of the above-mentioned thickness difference of the measured part is taken as the compression deformation amount of the first convex part 41' of the side part.

For example, when measuring a diaper sample that is compressed and filled in a packaged state, a sample that has been peeled off from the diaper and left for more than 1 day is cut into a specific size with a sharp razor. To cover the entire surface of the cut sample, place the plate after the load has been adjusted to 0.1kPa, and after more than 1 minute, measure from the horizontal support surface on which the sample is placed to the plate The distance to the point. Thereafter, the same measurement was performed at 2.0 kPa.

When it is difficult to measure with the naked eye, for example, a microscope (VHX-1000 manufactured by KEYENCE) can be used to observe the cross-section of the above-mentioned cut sample at a magnification of 20 to 100 times for measurement.

The height H1 of the center first convex portion 41 and the height H1' of the side first convex portion 41' are measured as follows.

〔Method of measuring the height of convex part〕

The sample was cut with a sharp razor, the cut end surface was observed, and the shortest distance between the bottom surface of the second sheet 2 and the top surface of each convex portion was measured. Let the obtained value be the height of each convex part. When it is difficult to measure with the naked eye, for example, a microscope (VHX-1000 manufactured by KEYENCE) can be used to observe the section of the cut sample at a magnification of 20 to 100 times for measurement. Also, for example, when taking a sample of a diaper that has been compressed and filled in a package In the case of measurement, the sample which peeled off the top sheet from the diaper and left it for 1 day or longer was measured in the same manner as above, and the obtained value was used. The height of each convex part is measured under no load.

Furthermore, the said composite sheet 10 used for the surface sheet 12 of the diaper 100 of 1st Embodiment is demonstrated.

[Construction of the central area M of the composite sheet 10]

In FIG. 8, an enlarged plan view of the central area M of the composite sheet 10 shown in FIG. 3 is shown. 9(a) to 9(c) are the Va-Va line cross-sectional view, the Vb-Vb line cross-sectional view, and the Vc-Vc line cross-sectional view of FIG. 8.

As shown in Figures 3, 4, and 8, in the central area M of the composite sheet 10, a plurality of central continuous strips extending continuously in the second direction Y are formed at a fixed distance in the first direction X Convex 40. As shown in Fig. 8 and Fig. 9(a) in each of the central continuous convex portions 40, the central first convex portions 41, which are alternately arranged in the second direction Y, and the first convex portions 41 whose height is lower than the central The central second convex portion 42 is connected to each other. In this specification, the so-called connection of convex parts means that two adjacent convex parts are not separated by a joining part, but a part of one of the convex parts forms a part of the other convex part, and the other convex part A part forms a part of one of the convex parts.

It is preferable that the central first convex portion 41 and the central second convex portion 42 constituting the central continuous convex portion 40 have a cavity at least on the back side of the central first convex portion 41, and more preferably have a cavity on the back side of each of them. The cavity on the back of the central first convex portion 41 is continuous with the cavity on the back of the central second convex portion 42, and a continuous extending in the second direction Y is formed on the back side of the central continuous convex portion 40 The hollow part is 40V.

The central first convex portion 41 and the central second convex portion 42 constituting the central continuous convex portion 40 are both substantially circular in plan view as shown in FIG. 8. In addition, the central first convex portion 41 and the second convex portion 42 are present in The cross-section in any one of the first direction X and the second direction Y has a top shape.

As shown in FIG. 8, in the central area M of the composite sheet 10, there are alternately formed in the first direction X: non-embossed areas N extending in the second direction Y and extending in the second direction Y The upper surface is continuous without joints; and the embossed area E, which extends in the second direction Y, and is formed with joints in a regular pattern.

In the embossing area E, as a joining part formed by partially joining the laminated first sheet 1 and the second sheet 2 by embossing, a first joining part 31 and a second joining part 32 are formed . At these junctions 31, 32, the first sheet 1 and the second sheet 2 are integrally pressed by embossing, and both sheets have a higher density than the other parts, preferably by The two sheets are thermally fused by melting and solidifying the constituent resins of one or two of the sheets.

In each embossing area E, the arrangement positions of the first joining portion 31 and the second joining portion 32 in the second direction Y are different as shown in FIG. 8. In addition, the lengths L1 and L2 of the first joining portion 31 and the second joining portion 32 along the second direction Y are also different. The first joining portion 31 has a rectangular shape in plan view, and each side of the rectangular shape coincides with the first direction X or the second direction Y. The planar shape of the second joining portion 32 is a substantially square, and each side of the square coincides with the first direction X or the second direction Y.

The long sides of the first joining portion 31 having a rectangular shape are aligned with the first direction X, and are arranged in a row at intervals along the second direction Y. Thereby, the first joining portion row R1 along the second direction Y is formed. One of the two sides orthogonal to each other of the second joining portion 32 is aligned with the second direction Y, and the other side is aligned with the first direction X, and are arranged in a row with an interval in the second direction Y. Thereby, the second joining portion row R2 along the second direction Y is formed.

In each first joining part row R1, the arrangement interval of the first joining parts 31 in the second direction Y is constant. In each of the second joining portion rows R2, the arrangement intervals of the second joining portions 32 in the second direction Y have two types of intervals, alternately having a portion with a wider interval and a portion with a narrow interval. In each first joint In the row R1, the arrangement positions of the first joining portions 31 when viewed in the second direction Y are all the same. Regarding each second joining portion row R2, the arrangement position of the second joining portion 32 when viewed in the second direction Y is also all the same.

Each embossing area E includes one first joining portion row R1 and two second joining portion rows R2 located on both sides of the first joining portion row R1 in the first direction X as shown in FIG. 8.

Focusing on one first joining part 31 constituting the first joining part row R1, a total of four second joining parts 32 constituting the two second joining part rows R2 are located around the first joining part 31 and are close to It is arranged in a state where the corners of each are opposed to the four corners of the first joining portion 31. Thereby, a joining part group 30 including one first joining part 31 and four second joining parts 32 located around it is formed. In each embossing area E, a plurality of the same joining part groups 30 are formed along the second direction Y at regular intervals.

By forming the first joining portion 31 and the second joining portion 32 in the composite sheet 10 in the above-mentioned manner, and the corresponding non-embossed area N in the first sheet 1 during the production of the composite sheet 10 The part or the part corresponding to the part between the first joining parts 31 in the embossing area E is pressed from the back side, or sucked from the front side, and the central area M of the composite sheet 10 is formed as shown in FIG. 8 9 includes the central continuous convex portion 40 of the central first convex portion 41, or the central third convex portion 43, etc., as shown in the plan shape and the cross-sectional shape as shown in FIG.

The central continuous convex portion 40 used in the central region M of the composite sheet 10 of the first embodiment extends continuously in the second direction Y, and forms a portion with a regular width shrinking in the second direction Y. In detail, as shown in FIG. 8, between a pair of first joining portions 31 that face each other across the non-embossed area N, a central first convex portion 41 is formed. The area surrounded by the total of the four second joining portions 32 of the two pairs of second joining portions 32 facing the area N is formed with a central second convex portion 42. Regarding the length along the first direction X, the central second convex The length L42 of the part 42 is the first The length L41 of the convex portion 41 is short. The portion of the central continuous convex portion 40 including the central second convex portion 42 is a portion having a narrower width (length in the first direction X) in the middle than the portion including the central first convex portion 41.

In addition, the composite sheet 10 used in the first embodiment, as shown in FIGS. 8 and 9(c), has a discontinuous central third convex portion surrounded by a ring-shaped concave portion in the embossed area E 43. The central third convex portion 43 has a shape having a top in a cross section in any one of the first direction X and the second direction Y. The height of the central third convex portion 43 is lower than that of the central first convex portion 41. The center third convex portion 43 has a cavity 43V on the back side of each, but it may not have such a cavity 43V.

As shown in FIG. 8, the center 3rd convex part 43 is spaced apart in the 2nd direction Y by a fixed distance, and plural pieces are linearly arrange|positioned in a row, and comprise the center 3rd convex part row. The central second convex portion 42 and the central third convex portion 43 are formed at the same position in the second direction Y. In more detail, the central second convex portions 42 and the central third convex portions 43 are alternately arranged in a linear shape along the first direction X. The central third convex portion 43 is located in the directions Da and Db intersecting the second direction Y, and is located between the central first convex portions 41 and 41. In this embodiment, the directions Da and Db intersecting the second direction Y are oblique directions with respect to each of the first direction X and the second direction Y, but the central third convex portion 43 may also be used as a direction opposite to the second direction. In the first direction X of the direction Y intersects, the center first convex portions 41 and 41 are located between each other.

Furthermore, as shown in FIG. 8, if attention is paid to the fourth convex portion 44 in addition to the central second convex portion 42 and the central third convex portion 43, the three types of convex portions are referred to as the central second convex portion 42 and the central third convex portion 43. The 4th convex part 44, the center 3rd convex part 43, and the 4th convex part 44 are arrange|positioned regularly and linearly along the 1st direction X in this order.

The upper surface of the fourth convex portion 44 is substantially flat. Furthermore, the fourth convex portion 44 literally means "convex portion", but since the height of the fourth convex portion 44 and any of the central first and second convex portions 41, 42 constituting the central continuous convex portion 40 One is relatively low compared to the center third convex portion 43, and therefore relatively becomes a concave portion from the perspective of these convex portions.

The central region M of the composite sheet 10 used in the present embodiment is formed with the above-mentioned central first convex portion 41, central second convex portion 42, central third convex portion 43, and fourth Convex 44. The height of the fourth convex portion 44 is lower than any one of the central first convex portion 41, the central second convex portion 42, and the central third convex portion 43.

[The structure of the side area S of the composite sheet 10]

As shown in FIG. 3, in one of the pair of side regions S and S of the composite sheet 10, the first sheet 1 is formed in a pattern different from the convex portion in the central region M in the direction other than the joining portion. A convex part formed by protruding away from the second sheet 2. The expression of the different patterns of the protrusions includes any of the cases where only the arrangement of the protrusions is different, the case where the shapes of the protrusions are different, and the case where the two are different. The different configurations of the convex parts also include the different distances between the convex parts. In addition, the state where the shape of the convex portion is different also includes the case where the shape of the convex portion is different in plan view.

In the composite sheet 10 of the present embodiment, the central area M and the pair of side areas S and S differ in the arrangement and form of the convex parts.

In FIG. 10, an enlarged plan view of the side region S of the composite sheet 10 shown in FIG. 3 is shown. Fig. 11 is a sectional view taken along the line Vd-Vd in Fig. 10;

As shown in these figures, in the side area S of the composite sheet 10, a plurality of rows are formed in the first direction X, and the third joining portions 33 are regularly arranged along the second direction Y at two kinds of intervals La and Lb. The second direction junction row R. In more detail, the second direction joint portion row R has a first interval La and a second interval Lb wider than the first interval La as the interval between the third joint portions 33 in the second direction Y. The plurality of third joints 33 in the two-direction joint row R are intermittently arranged in the second direction Y so as to alternately have the two kinds of intervals in the second direction Y.

The length and arrangement position in the first direction X of a plurality of third joint portions 33 constituting each second direction joint portion row R are the same, and are formed between adjacent second direction joint portion rows R in the first direction X There is a gap of fixed width W. In addition, a plurality of rows of second-direction joining portion rows R are formed in the first direction X, and every other row, the arrangement positions of the third joining portions 33 in the second direction Y are the same, and adjacent second-direction joining The arrangement positions of the third joining portions 33 in the second direction Y of the row R are different from each other. In detail, in the side region S of the composite sheet 10 in this embodiment, as shown in FIG. The arrangement positions of the upper third joining portions 33 are different from each other in the second direction first joining portion row R3 and the second direction second joining portion row R4, and regarding the arrangement position of the third joining portion 33 in the second direction Y , In the second direction first joining portion row R3 and the second direction second joining portion row R4 in the other joining portion row R, a pair of the third joining portion 33 adjacent to each other at a first interval La is located at one of the joining portions The third joining portions 33 adjacent to each other at the second interval Lb in the row R are between each other.

Furthermore, as shown in FIG. 10, the side portion is formed in an area surrounded by a total of six joint portions 33 including two adjacent third joint portions 33, 33 in the second direction joint portion row R. The first convex portion 41'.

In the composite sheet 10 of the present embodiment, in each of the second-direction joint portion rows R, the intermittently arranged in the second direction Y at an interval Lb that is more than twice the first interval La and included in the second direction Y The joining part pair 34 of a pair of the third joining part 33 is arranged close to each other at a first interval La, and the side first convex part 41 ′ is formed between the joining part pairs 34 and 34 adjacent to each other in the second direction Y. The bonding portion pair 34 includes a pair of third bonding portions 33 adjacent to each other at the narrowest interval La in the second direction bonding portion row R.

In the composite sheet 10, the third joint 33 is formed in the above-mentioned manner, and when the composite sheet 10 is manufactured, the first sheet 1 is equivalent to a total of six third joints 33. The part of the enclosed area is pressed from the back side, or sucked from the front side, and the side areas S and S of the composite sheet 10 are formed with a plurality of top-view shapes and cross-sections as shown in FIGS. 10 and 11 The first convex part 41' of the side part of the shape.

As shown in FIGS. 3, 5, and 10, in the side region S of the composite sheet 10, the composite sheet 10 is formed in a scatter shape in plan view, more specifically, in a staggered shape. '. The side first convex portion 41 ′ is surrounded by the six third joining portions 33 described above. The part between the six third joining parts 33 and the six third joining parts 33 that surround the first convex part 41' of the side part between the adjacent third joining parts 33 is the part of the first convex part 41' of the side part. A ring-shaped concave portion is formed around the center portion, and the side first convex portions 41 ′ are formed in a state of being dispersed in the planar direction of the composite sheet 10.

In more detail, as shown in FIG. 10, a plurality of first imaginary straight lines L3 that are assumed to be parallel to each other in a plan view of the composite sheet 10, and an angle θ with the first imaginary straight line L3 (refer to FIG. 10) When a plurality of second imaginary straight lines L4 are parallel to each other, the side first convex portion 41' is located at each intersection of the first imaginary straight line L3 and the second imaginary straight line L4. The angle θ formed by the first virtual straight line L3 and the second virtual straight line L4 (see FIG. 10) is preferably 30° or more and 165° or less, and more preferably 45° or more and 150° or less. The first imaginary straight line L3 and the second imaginary straight line L4 may be drawn so that the side first convex portion 41' is located at each intersection point of the two. Furthermore, in the example shown in FIG. 10, both the first imaginary straight line L3 and the second imaginary straight line L4 are inclined with respect to the first direction X and the second direction Y, but the first imaginary straight line L3 or the second imaginary straight line L3 may be Either or both of the straight lines L4 are set to be parallel to the first direction X or the second direction Y.

In the side region S of the composite sheet 10, there are formed a plurality of third-direction convex portions rows, which are a plurality of side first convex portions 41' arranged in series along the first imaginary straight line L3 at fixed intervals Into; and a plurality of rows of convex portions in the fourth direction, which are a plurality of first convex portions 41 ′ of the side portion arranged in series along the second imaginary straight line L4 at a fixed interval. In addition, between adjacent rows of convex portions in the third direction, there are formed a plurality of pairs of joint portions 34 in series with a fixed interval in the third direction joint portion row R5, in the adjacent fourth direction convex portion row Between each other, a fourth-direction junction row R6 in which a plurality of junction pairs 34 are arranged in series at a fixed interval is formed. Preferably, it is assumed that the first imaginary straight line L3 is arranged at a fixed interval between the connecting portion rows (third connecting portion row) R5 formed by the plurality of connecting portion pairs 34 (or the plurality of connecting portions 33). It is assumed that the second imaginary straight line L4 extends in parallel with each other at a fixed interval between a plurality of joint portion pairs 34 (or plural joint portions 33) and a joint portion row (third joint portion row) R6. Equally extend in parallel.

Between the pair of third joints constituting each of the joint pair 34 and the joint pair 34 adjacent to each other around the first convex portion 41' of the side portion, the small convex portion 44' is formed between the small convex portion 44'. The height to the extent that it protrudes slightly from the upper surface of the third joining portion 33, usually, the height H4' is less than 1/3 of the side first convex portion 41'.

Therefore, the third-direction convex portion rows and the fourth-direction convex portion rows become ventilation ducts through which air can easily circulate, and excellent air permeability can be obtained.

In the first embodiment, as described above, in the central region M of the composite sheet 10 used as the front sheet 12, there are formed a plurality of rows of central continuous convex portions 40 composed of the central first convex portion 41, and On the one hand, in the side region S, side first convex portions 41' are formed in a scattered dot shape.

Therefore, the high-density region of fibers generated near the root K of the convex portion by the compression of the central first convex portion 41 is generated in multiple or continuously along the central continuous convex portion 40, and the liquid in the central area M is absorbed Performance is further improved. In addition, in the side region S, the first side convex portions 41 ′ are formed in a scattered dot shape, and the first side convex portions 41 ′ are less easily deformed with respect to pressure.

By these, the air permeability and the introduction of liquid can be further improved.

Furthermore, the central continuous convex portion 40 preferably extends in the article width direction Ya (second direction Y), but the same effect can also be obtained when it extends in the article length direction Xa (first direction X).

Furthermore, in the first embodiment, the central continuous convex portion 40 formed in the central region M of the composite sheet 10 has a central first convex portion 41 and a central second convex portion 42 whose height is lower than the central first convex portion 41 The structure is alternately connected, but instead of it, only the central first convex part, which is the convex part with the largest height, may be connected to each other. In this case, the same effect can also be obtained.

Moreover, in the side region S, as in the present embodiment, only the side first convex portion 41' and the above-mentioned minute convex portion 44' may be formed with the largest height, but may be further formed with an intermediate height. For the second convex portion (not shown), for example, the side first convex portion 41' and the second convex portion (not shown) may be distributed so as to be mixed in the planar direction.

Furthermore, in the first embodiment, the central continuous convex portion 40 formed in the central region M of the composite sheet 10 extends in the article width direction Ya (second direction Y), and in the side region S, the side The first convex portion 41' is located at each intersection of the above-mentioned grid. Therefore, the moisture generated from the liquid absorbed by the high-density region of the fibers formed near the root of the convex portion K formed in the central region M can pass through the continuous hollow portion 40V formed in the central continuous convex portion 40, or The central continuous convex portions 40 spread in the width direction between each other, and pass between the third direction convex portion rows and the fourth direction convex portion rows formed in the side region S to effectively spread over the entire surface of both sides. Diffusion, so it can further suppress the stuffiness when wearing.

In the composite sheet 10 used in the first embodiment, the central first convex portion 41 is sandwiched by the central third convex portion 43 in the central area M. Therefore, when the pressure is applied, the central first convex portion 41 is The part higher than the height of the central third convex part 43 is deformed in the plane direction, and the part lower than the height of the central third convex part 43 is not easily deformed in the planar direction, thereby, the inner part of the central first convex part 41 Between the top part B1 deformed by pressure and the part B2 near the junction with the second sheet 2, a fiber density gradient that increases from the part B1 toward the part B2 is likely to occur. Thereby, the introduction property of the liquid from the 1st sheet material 1 to the 2nd sheet material 2 is more excellent.

In addition, the height H3 of the center third convex portion 43 in the central region M is equal to the height H1' of the side first convex portion 41'.

By making the heights equal, the pressure applied to the front sheet 12 can be dispersed when the central first protrusion 41 is crushed. Therefore, the side first protrusion 41' of the side region S is less likely to be deformed with respect to the pressure. and The air permeability of the side region S can be ensured more reliably.

Furthermore, in the expression of equal height, in addition to the case where the height H3 of the central third convex portion 43 is strictly equal to the height H1' of the side first convex portion 41', the height of the central third convex portion 43 is also included. The difference (the absolute value of H3-H1') between H3 and the height H1' of the side first convex portion 41' is within 10% of the height H3 of the central third convex portion 43.

In the composite sheet 10 used in the first embodiment, as shown in FIG. 8, the central third convex portion 43 in the central region M is formed in plural along the second direction Y, and is formed in the second direction Y Between the upper adjacent third convex portions 43 at the center, a first joining portion 31 which is a longitudinal joining portion of a shape elongated in the first direction X is formed. The presence of the first joining part 31 as a longitudinal joining part between the central third convex part 43 makes it easier to form the fiber density from the top of the central first convex part 41 toward the first joining part 31 and the fiber density increases Gradient, and the absorption of the liquid is further improved.

In addition, in the disposable diaper 100 of the first embodiment, the elastic member arrangement area BM (refer to FIG. 1) in which a plurality of elastic members 19 are arranged in at least the widthwise central portion of the back side portion B is arranged with the above-mentioned composite The central area M of the sheet 10 and the elastic member arrangement area BM respectively extend in the second direction Y to form a plurality of rows of central continuous convex portions 40 including the central first convex portion 41 described above.

Furthermore, as shown in FIG. 12, the width of the central continuous convex portion 40 in the elastic member arrangement area BM is set to P1, the interval between the above-mentioned elastic members 19 is set to P2, and the central portion of the central continuous convex portion 40 When the distance between each other is set as P3, the relationship of P1<P2<P3 is satisfied.

The plurality of elastic members 19 in the disposable diaper 100 is one that shrinks the diaper in the width direction to improve the conformability of the back side portion B, but if the structure overlaps with the area BM where the plurality of elastic members 19 are arranged, it is arranged The central continuous convex portion 40 and the elastic member 19 of the composite sheet 10 of the front sheet 12 satisfy the above-mentioned relationship. The elastic member 19 makes the back side portion B of the diaper 100, especially relatively Even if the portion of the absorbent body 14 that extends toward the back end side is contracted in the second direction Y along the article width direction Ya, it is easy to maintain the shape of the central continuous convex portion 40 without impairing the liquid absorption effect. Thereby, the liquid absorption effect of the back side part B becomes high, and the liquid leakage from the back side part B side can be suppressed.

Furthermore, if the first joints 31 as the above-mentioned longitudinal joints are arranged at equal intervals in the second direction Y along the article width direction Ya, the contraction of the central continuous convex part 40 accompanying the contraction of the elastic member 19 becomes regular. , A density gradient of fiber density is also formed in the central continuous convex portion 40, and the liquid absorption effect of the back side portion B is further increased.

The length along the first direction X of the first joining portion 31 as the longitudinal joining portion is preferably 1.2 times or more of the length along the second direction Y, more preferably 1.5 times or more, and more preferably 5 times or less, It is particularly preferably 3 times or less, more specifically, 1.2 times or more and 5 times or less, and particularly preferably 1.5 times or more and 3 times or less.

In addition, the length of the first joining portion 31 as the longitudinal joining portion along the first direction X is preferably 1.2 times or more, more preferably 1.5 times or more, of the length along the first direction X of the second joining portion 32, and , Preferably 5 times or less, more preferably 3 times or less, more specifically, preferably 1.2 times or more and 5 times or less, particularly preferably 1.5 times or more and 3 times or less.

The length along the first direction X of the first joint 31 as the longitudinal joint is preferably 0.5 mm or more, more preferably 1 mm or more, more preferably 10 mm or less, particularly preferably 5 mm or less, more specifically , Preferably 0.5 mm or more and 10 mm or less, particularly preferably 1 mm or more and 5 mm or less.

In addition, the length of the second joining portion 32 along the first direction X is preferably 0.1 mm or more and 5 mm or less, more preferably 0.5 mm or more and 3 mm or less, and the length along the second direction Y is preferably 0.1 mm or more and 5 mm. Or less, more preferably 0.5 mm or more and 3 mm or less.

In addition, the length of the third joining portion 33 along the first direction X is preferably 0.1 mm or more and 5 mm or less, more preferably 0.5 mm or more and 3 mm or less, and the length along the second direction Y is preferably 0.1 mm or more and 5 mm. Or less, more preferably 0.5 mm or more and 3 mm or less.

In addition, the interval Lb of the portion with the larger interval between the third engagement portion 33 in the second direction Y of the second direction engagement portion row R of the third engagement portion 33 is the third engagement with respect to the portion with the smaller interval The interval La between the portions 33 is preferably 2 times or more, more preferably 2.5 times or more, preferably 5 times or less, particularly preferably 4 times or less, preferably 2 times or more and 5 times or less, particularly preferably 2.5 times More than 4 times and less than 4 times.

The heights H2, H3, H4, and H4' of the convex portions 42, 43, 46, and 44' are defined as self-facing absorber 14 in the same way as the central first convex portion 41 and the side first convex portion 41'. The distance from the lower surface of the second sheet 2 on the side to the upper surface of the first sheet 1 forming the top of the convex portion 4 (FIG. 9 and FIG. 11), and the height H1 of the above-mentioned central first convex portion 41 The measurement method of the height H1' of the side part 1st convex part 41' is performed similarly.

Next, referring to FIGS. 13 to 15, a preferred method of manufacturing the composite sheet 10 constructed as described above will be described. The method of manufacturing the composite sheet 10 has the following shaping steps, that is, as shown in FIG. 13, the first roller 111 whose peripheral surface has a concave and convex shape is meshed with the concave and convex shape on the peripheral surface of the first roll. The second roller 112 of the concave-convex shape of the same shape rotates in opposite directions, and while feeding the first sheet 1 to the meshing portion of the two rollers 111 and 112, the first sheet 1 is concave-convex shaped. In addition, the manufacturing method of the composite sheet 10 has the following joining step after the shaping step, that is, after the first sheet 1 is moved along the peripheral surface of the first roller 111 and maintained in this state and moved from the meshing portion , The second sheet 2 is fed so as to overlap the first sheet 1, and the two sheets 1 and 2 are heated between the convex portion of the first roller 111 and the first heat roller 113 and the second heat roller 114 Partially join by crimping.

As shown in FIG. 13, the second roller 112, the first heat roller 113, and the second heat roller 114 are relative to the first roller. The circumference of 111 is oppositely arranged. The second roller 112, the first heat roller 113, and the second heat roller 114 are arranged in this order from the upstream side to the downstream side in the rotation direction T of the first roller 111. The details of the first roller 111 and the second roller 112 whose peripheral surface is a concave-convex shape will be described below. The first heat roller 113 and the second heat roller 114 are flat anvil rollers having no unevenness on the peripheral surface, respectively.

First, the first sheet 1 is successively fed out from the original sheet roll (not shown) of the first sheet 1. In addition, separately from this, the second sheet 2 is successively fed out from the original sheet roll (not shown) of the second sheet 2. Then, as shown in FIG. 13, the first sheet 1 that has been fed out one after another is bitten into the meshing portion of the first roller 111 and the second roller 112 to shape the first sheet 1 into concavities and convexities. At this time, the first roller 111 is sucked from its peripheral surface toward the inside of the roller, and the unevenness of the first sheet 1 is promoted.

Then, as shown in FIG. 13, the first sheet 1 is continuously sucked to the peripheral surface of the first roller 111 and kept in a shaped state, superimposed on the second sheet 2, and the superimposed one is placed on the first roller 111 It is pinched with the first heat roller 113 whose peripheral surface is smooth. At this time, both of the first roller 111 and the first heat roller 113 or only the first heat roller 113 are heated to a specific temperature in advance. Thereby, the 1st sheet material 1 and the 2nd sheet material 2 located on the convex part 11a of the 1st roller 111 are joined by heat fusion, and the joining part 31-33 is formed.

Then, the superposed body of the first sheet 1 and the second sheet 2 joined by heat fusion is moved while being continuously attracted to and held on the peripheral surface of the first roller 111, and the superposed body is moved to the first The roller 111 and the second heat roller 114 having a smooth peripheral surface are nipped. At this time, both of the first roller 111 and the second heat roller 114 or only the second heat roller 114 are heated to a specific temperature in advance. Thereby, the joining parts 31, 32 on the convex part 11a of the first roller 111, the material constituting the first sheet 1 and the second sheet 2, for example, the thermoplastic resin melts, and the joining parts 31 to 33 are further strengthened. form. In this way, the target composite sheet 10 can be continuously manufactured.

In the manufacture of the above-mentioned composite sheet 10, as the first roller 111 and the second roller 112, a central region forming part having the above-mentioned central region M formed in the composite sheet 10 is used in the central part of the axial length direction. Furthermore, it is provided with the side area formation part which forms the said side area|region S and S in the composite sheet 10 on both sides of the center part sandwiching the axial length direction.

The first roller 111 and the second roller 112 combine a plurality of gears and spacers with different tooth patterns in the circumferential direction, and install the gears and spacers concentrically on the shaft core to gather them into a roller shape. The first roller 111 and the second roller 112 are formed in the central region forming part and the side region forming part, and the pitch between the teeth of the gears used, the combination of the gears, the arrangement of spacers, etc. are different.

In FIG. 14, there is shown a state in which the convex portion of the second roller 112 is meshed with the peripheral surface of the central region forming portion of the first roller 111 and expanded into a flat state. In FIG. 15, the second roller 112 is shown The convex portion is meshed with the peripheral surface of the side region forming portion of the first roller 111 and spreads out into a flat state. In FIGS. 14 and 15, the direction indicated by the arrow U is the rotation direction of the first roller 111 and the second roller 112, and the direction indicated by the arrow V is the axis of the first roller 111 and the second roller 112 Core direction. In addition, in the two figures of FIGS. 14 and 15, the rectangular or square-shaped area represented by the thin dots represents the tooth top surface of the gear of the first roller 111, and the area represented by the thick dots represents the second roller The tooth top surface of the 112 gear.

In the above-mentioned forming step of forming irregularities on the first sheet 1, in each of the central area forming portion and the side area forming portion, the first sheet 1 passes through the teeth of the gears of the second roller 112 The top surface is pressed into the concave portion formed on the peripheral surface of the first roller 111, and three-dimensional shaping corresponding to each convex portion of the central area M and the side areas S and S is performed. Thereafter, by bonding the second sheet 2 to the first sheet 1 that has been three-dimensionally shaped, the target composite sheet 10 can be obtained. The composite sheet 10 obtained in the above manner is introduced into the production line of the diaper 100, and is set as the front sheet 12 of the disposable diaper 100 by a known method. When the first sheet 1 is bitten into the meshing portion of the first roller 111 and the second roller 112 to deform into a concave-convex shape, it is preferable to attract the first sheet 1 toward the inner direction of the first roller to promote The deformation of the first sheet 1 to the uneven shape.

In an absorbent article, the lower part of the crotch that is placed under the wearer’s crotch during wearing is sandwiched by the wearer’s thigh during wearing. Therefore, the direction corresponding to the wearer’s front and back direction is set When it is a longitudinal direction, when the direction orthogonal to the longitudinal direction is set to a lateral direction, it is easy to be compressed in the lateral direction. Previous absorbent articles have the following problems: Since the lower part of the crotch is irregularly bent and deformed when it is compressed in the lateral direction, the skin of the lower part of the crotch is less tactile, and the excretory part of the self-wearing author is relative to the lower part of the crotch. The excreted urine and other excretion fluids cannot be blocked by specific parts due to the irregular bending and deformation of the lower part of the crotch, and it is easy to splash to the non-presumed parts, which will cause the liquid to splash. Even a small amount of excretion fluid is easy to leak.

Therefore, the present invention (the second invention) relates to providing an absorbent article that has a good touch to the skin under the crotch, is excellent in wear, and is less likely to leak.

Hereinafter, the absorbent article of the present invention (the second invention) will be described based on its preferred embodiment with reference to the drawings. In FIG. 16 and FIG. 17, the disposable diaper 200 which is an embodiment of the absorbent article of this invention (2nd invention) is shown. The diaper 200 has a ventral part 1F arranged on the ventral side of the wearer when worn, a dorsal part 1R arranged on the back side, and a lower part of the crotch 1M between them. It extends to the back side 1R and corresponds to the longitudinal direction X in the front and back direction of the wearer and the transverse direction Y perpendicular to it. The abdominal part 1F, the crotch part 1M, and the back part 1R correspond to each area when the diaper 200 is divided into three equal parts in the longitudinal direction X. The crotch portion 1M has an excretion opposing portion arranged opposite to the excretion of the wearer's penis when the diaper 200 is worn, and the excretion opposing portion is usually located at or near the center of the longitudinal X of the diaper 200.

As shown in FIGS. 16 and 17, the diaper 200 includes an absorbent body 4 having an absorbent core 140, and is arranged on the skin facing side of the absorbent body 4 and used as a front material that can contact the wearer's skin when worn The liquid-permeable front sheet 102, and the liquid-impermeable or water-repellent back sheet 103 arranged on the non-skin facing side of the absorbent body 4, and are located on the crotch in a plan view as shown in FIG. The central part of the longitudinal X of the lower part 1M is retracted to the inside and is longer in one direction, that is, the longitudinal X, and is in the shape of a longitudinal hourglass. The front sheet 102 and the back sheet 103 each have a size larger than the absorber 4 interposed and disposed between the two sheets 102 and 103.

The front sheet 102 is longer than the absorber 4 with respect to the length in the longitudinal direction X, but is approximately the same as the absorber 4 in terms of the length in the transverse direction Y, that is, the width, as shown in FIG. The side edges 2S and 2S are consistent with the side edges of the absorbent body 4 along the longitudinal direction X. In addition, as described below, the absorbent body 4 includes the absorbent core 140 and the core covering material 45. As a result, the side edges 2S, 2S of the front sheet 102 and the maximum width portion of the absorbent core 140 are along the longitudinal direction X The edges on both sides are the same (refer to Figure 17).

On the other hand, the back sheet 103 has a size larger than the front sheet 102 in the transverse direction Y as shown in FIG. 17, and extends from the periphery of the absorbent body 4 to the outside, and is formed as shown in FIG. The outer shape of the diaper 200 in the expanded state. As the back sheet 103, various back sheets previously used for such absorbent articles can be used without particular limitation, and resin films, laminates such as resin films and non-woven fabrics, and the like can be used.

In this specification, the "skin facing surface" refers to the surface of the absorbent article or its constituent members (for example, absorbent body 4) that faces the wearer's skin side when the absorbent article is worn, that is, relatively approaching On the side of the wearer’s skin, the so-called "non-skin facing surface" refers to the surface of the absorbent article or its constituent members that faces the side opposite to the skin side (clothing side) when the absorbent article is worn, that is, Relatively away from the side of the wearer's skin. Furthermore, the term "wearing" here refers to the state of maintaining the usual proper wearing position, that is, the correct wearing position of the absorbent article, and does not include the state in which the absorbent article deviates from the wearing position .

In addition, side sheets 5 are arranged on the left and right sides along the longitudinal direction X on the side of the front sheet 102 of the diaper 200, respectively. The side sheet 5 has an inner edge along the longitudinal direction X, and is located more than the inner edge. On the outer side of the lateral direction Y and along the longitudinal direction X, the inner edge overlaps with the absorbent body 4 as shown in FIG. The side edge along the longitudinal direction X extends to the outer side of the lateral direction Y and is joined to the back sheet 103. Between the side sheet 5 and the back sheet 103 in the left and right legs arranged around the leg of the wearer, the linear elastic member 50 is fixed in an extended state along the longitudinal direction X, thus, the diaper 200 When the legs are worn, a pair of leg folds are formed by the contraction of the elastic member 50. In addition, at the inner edge of the side sheet 5, a linear elastic member 51 is fixed in an extended state along the longitudinal direction X. Therefore, when the diaper 200 is worn, the elastic member 51 shrinks at least at the lower part of the crotch 1M The side sheet 5 uses the junction with the back sheet 103 as a starting point, and the inner edge side stands up toward the wearer's skin side to form a leak-proof cuff. The anti-leakage cuffs can prevent urine and other excretion fluids from flowing out to the lateral side Y, that is, side leakage. The front sheet 102, the back sheet 103, the absorber 4, the side sheets 5, and the elastic members 50 and 51 are joined to each other by a well-known joining method such as a heat-fusion type adhesive.

The diaper 200 is a so-called unfolded disposable diaper. As shown in FIG. The hook and loop fastener 6 is equipped with a fixing part (not shown) of a male member including a mechanical surface fastener. In addition, on the non-skin facing surface of the ventral portion 1F of the diaper 200, a fixed region 7 including a mother member of a mechanical surface fastener is formed. The fixed area 7 is the non-skin-facing back sheet 103 that connects the mother member of the mechanical surface fastener to the back sheet 103 forming the non-skin facing surface of the ventral portion 1F by a known joining method, such as an adhesive or heat sealing. The skin facing surface is formed, and the above-mentioned fixing part of the hook and loop fastener 6 is made to be detachably fixed.

Hereinafter, the absorber 4 will be described.

The absorber 4 has a shape elongated in the longitudinal direction X in a plan view as shown in FIG. 16, and extends from the ventral portion 1F including the crotch portion 1M and the back portion 1R. The absorbent body 4 is composed of the following components: The result is a liquid-retaining absorbent core 140, which includes an absorbent material, and a core-coating material 45, which covers the skin-facing surface 40a and the non-skin-facing surface 40b of the absorbent core 140. The absorptive core 140 and the core covering material 45 are joined by a well-known joining method such as a heat-fusion adhesive. The absorber 4 (absorbent core 140) is formed symmetrically with respect to an imaginary straight line (not shown) that divides the diaper 200 into two parts in the transverse direction Y and extends in the longitudinal direction X.

The absorbent core 140 has a single-layer structure, and as shown in FIG. 16, as shown in FIG. 16, as shown in FIG. The absorbent core 140 is formed by stacking core-forming material fibers containing absorbent materials. As the absorbent material, those generally used as the material for forming such absorbent cores can be used without particular limitation. Examples include: wood pulp, hydrophilic fibers such as synthetic fibers treated with a hydrophilizing agent, or water-absorbent polymers.物particles. That is, the absorbent core 140 may be a fiber accumulation of hydrophilic fibers, or a fiber accumulation that supports water-absorbent polymer particles.

As the core-coating material 45, a water-permeable sheet can be used, for example, paper, non-woven fabric, etc. can be used. In the diaper 200 of the present embodiment, the core-covering material 45 is a continuous core-covering material 45 having a width of at least 2 times and 3 times the width of the transverse direction Y of the absorbent core 140. The material 45 covers the entire area of the skin-facing surface 40a of the absorbent core 140 as shown in FIG. 17, and extends from both sides of the absorbent core 140 along the longitudinal direction X to the outside of the transverse direction Y. The part is rolled down to below the absorbent core 140, and covers the entire area of the non-skin facing surface 40b of the absorbent core 140. Furthermore, the form of the core covering material 45 is not limited to this. For example, it may be a skin-side core covering material including the skin facing surface 40a covering the absorbent core 140, and a non-skin covering material covering the absorbent core 140. The non-skin side of the facing surface 40b is covered with a core sheet, and the two sheets are independent individual sheets.

The absorbent body 4 has: a core low-rigidity region 40L, which is located at the center of the absorptive core 140 in the transverse direction Y and extends along the longitudinal direction X; and a core high-rigidity region 40H, which is located in the core low-rigidity region The two sides of the domain 40L in the transverse direction Y have higher rigidity than the core low-rigidity region 40L.

The core low-rigidity region 40L is a region in which a plurality of linear grooves 141 are formed in a lattice shape in a plan view as shown in FIG. The entire length of the core low-rigidity region 40L in the longitudinal direction X is shorter than the entire length of the absorbent core 140 in the longitudinal direction X. The front and rear ends are closer to the inside of the longitudinal X. The length of the core low rigidity region 40L in the transverse direction Y, that is, the length between the pair of grooves 141 and 141 located on the outermost side of the transverse direction Y, is fixed across the entire length of the longitudinal direction X of the region 40L.

On the other hand, the core high-rigidity region 40H is a region of the absorbent core 140 other than the core low-rigidity region 40L, and surrounds the core low-rigidity region 40L.

In the diaper 200 of this embodiment, the basis weight of the low-rigidity core region 40L is lower than that of the high-rigidity core region 40H. Therefore, the rigidity of the low-rigidity core region 40L is lower than that of the high-rigidity core region 40H. The reason why the basis weight of the core low-rigidity region 40L is lower than that of the core high-rigidity region 40H is that grooves 141 are formed in the non-skin facing surface 40b of the core low-rigidity region 40L as shown in FIGS. 16 and 17. In the core high-rigidity region 40H, a recess is not formed like the groove 141, and in the core high-rigidity region 40H, the skin-facing surface 40a and the non-skin-facing surface 40b are flat.

The groove 141 is a recess formed by deliberately reducing the fiber accumulation amount of the core-forming material containing the absorbent material compared to the peripheral portion in a known manufacturing method of an absorbent core using a fiber accumulation device. It is not a so-called embossed groove, that is, a recess formed by embossing (pressing processing) a flat-plate-shaped absorbent core with a uniform basis weight and no unevenness on the surface. Therefore, the usual embossed grooves are denser than the peripheral part because the core-forming material is compacted by embossing, but the grooves 141 are not compacted during the formation process, so There is no substantial difference in density compared with the peripheral part (non-groove forming part).

A known method for manufacturing an absorbent core that can be used for the formation of the groove 141 has, for example, the steps of attracting and depositing the core-forming material supplied on the air stream to the fiber stacking device (rotary drum, etc.). The bottom of the accumulation recess on the outer surface. As a result, in this step, it is possible to use the accumulation recess with the bottom opening rate partially different, specifically, the opening at the bottom corresponding to the groove 141 to be formed. The accumulation recesses adjusted to a relatively low rate form an absorbent core 140 having a core low-rigidity region 40L in which grooves 141 are formed, and a core high-rigidity region 40H in which grooves (recesses) are not formed. In the absorbent core 140 formed in this way, as shown in FIGS. 16 and 17, the portion where the fiber accumulation amount of the core-forming material is relatively small becomes the low basis weight portion 142 located at the formation portion of the groove 141. The portion where the fiber accumulation amount of the core forming material is relatively large becomes the high basis weight portion 143 as the non-formation portion of the groove (recess).

The core low rigidity region 40L has: a high basis weight portion 143, which has a relatively high basis weight and has a convex shape protruding toward the non-skin facing surface 40b; and a low basis weight portion 142, which is in line with the high basis weight The portions 143 are adjacent and have a relatively low basis weight and are recessed toward the skin facing surface 40a side; and the high basis weight portion 143 and the low basis weight portion 142 are integrally formed. Moreover, the low-rigidity core region 40L is ingeniously set as a low-basis-weight and low-rigidity groove 141 in comparison with the core high-rigidity region 40H, which is formed on the non-skin facing surface of the low-basis-weight portion 142. The recess on the side 40b. That is, the low basis weight portion 142 as the formation portion of the groove 141 has a lower basis weight and thickness than the high basis weight portion 143 as the non-formation portion of the groove (recess) in the core low rigidity region 40L. Smaller.

In the core low rigidity region 40L, as shown in FIG. 17, the non-skin facing surface 40b has a concave-convex structure due to the presence of a plurality of grooves 141. In contrast, the skin facing surface 40a does not have such grooves. (Concave) and flat. In this way, if the non-skin facing surface 40b side of the absorbent core 140 is made into a concavo-convex structure, the absorbent core 140 is likely to be softly deformed due to external force applied to the absorbent core 140, and therefore the diaper 200 can be worn Sexual improvement.

In the core low-rigidity region 40L, as shown in FIGS. 16 and 17, a plurality of linear grooves 141 extend in the longitudinal direction X, and a plurality of linear grooves 141 also extend in the transverse direction Y. A plurality of linear grooves 141 is the low basis weight portion 142, and the core low rigidity region 40L is divided into a plurality of small areas, and the small area is the high basis weight portion 143. That is, each high basis weight portion 143 is divided by the low basis weight portion 142 (groove 141), and is independent of each other. The shapes of the plurality of high basis weight portions 143 are substantially the same as each other, and all have a rectangular shape in a plan view, and the length in the longitudinal direction X is longer than the length in the lateral direction Y. On the other hand, regarding the low basis weight portion 142, the low basis weight portion 142 extends in the two directions of the longitudinal direction X and the lateral direction Y and is connected to each other to become a continuous body. The width of the low basis weight portion 142 extending in the longitudinal direction X (the length in the direction orthogonal to the longitudinal direction) and the width of the low basis weight portion 142 extending in the transverse direction Y may be the same or different.

In this way, the core low-rigidity region 40L has a block structure having a plurality of linear low-basis-weight portions 142 including a high-basis-weight portion 143 and a linear low-basis-weight portion 142 that spans the entire periphery of the high-basis-weight portion 143 and surrounds the block structure. The block area, and each block area is independent. The outermost periphery of the block structure is formed by the low base weight portion 142 as shown in FIG. 16. In addition, the recessed portion on the non-skin facing surface 40 b side of the absorbent core 140 at the formation position of the low basis weight portion 142 is a groove 141.

With the existence of the core low-rigidity region 40L of such a block structure, the absorbent core 140 becomes soft in both the longitudinal direction X and the transverse direction Y. Therefore, the absorbent core 140 becomes easy to follow the wearer's body In the shape of. Furthermore, by guiding the excretion fluid such as urine to the low basis weight portion 142 with a relatively thin thickness and flowing along the low basis weight portion 142, the diffusibility of the absorptive core 140 in the longitudinal direction X and the lateral direction Y can be improved.

The ratio of the basis weight of the low basis weight portion 142 to the basis weight of the high basis weight portion 143, that is, the basis weight of the low basis weight portion 142/the basis weight of the high basis weight portion 143 is preferably 20% or more, and more preferably 30% or more, more preferably 80% or less, more preferably 70% or less.

The basis weight of the low basis weight portion 142 itself is preferably 100 g/m ² or more, more preferably 150 g/m ² or more, and more preferably 500 g/m ² or less, and still more preferably 400 g/m ² or less.

The basis weight of the high basis weight portion 143 itself is preferably 300 g/m ² or more, more preferably 350 g/m ² or more, and more preferably 900 g/m ² or less, and still more preferably 800 g/m ² or less.

The basis weight is measured in the following manner.

<Method of Measuring Basis Weight>

A single-edged razor manufactured by FEATHER was used to cut along the boundary line between the low basis weight portion 142 and the high basis weight portion 143 in the absorbent core 140. The 10 small pieces of the high basis weight 143 obtained by cutting were measured using an electronic balance (electronic balance GR-300 manufactured by A & D Company, accuracy: 4 digits below the decimal point), and each high basis was determined. The average weight of the small pieces of the weight part 143. The calculated average weight is divided by the average area of each small piece of the high basis weight portion 143 to calculate the basis weight of the high basis weight portion 143. The basis weight of the core high rigidity region 40H described below is also calculated in the same way as the basis weight of the high basis weight portion 143.

Then, along the boundary line extending along the longitudinal direction X of the diaper 200 in the boundary line between the low basis weight portion 142 and the high basis weight portion 143, using a single-edged razor manufactured by Feather Company, cut 5 pieces of 100mm in length, width and low basis. The width of the heavy part 142 is a small piece of the longitudinal X of the thin stripe-shaped low basis weight part 142 that matches the design size. The 5 pieces obtained were measured using an electronic balance (electronic balance GR-300 manufactured by A & D Company, accuracy: 4 digits below the decimal point), and averaged to obtain the value of each low basis weight 142 The average weight of the small piece. The calculated average weight is divided by the average area of the small pieces in the longitudinal direction X of each low basis weight portion 142 to calculate the basis weight of the longitudinal direction X of the low basis weight portion 142. With regard to the lateral Y of the low basis weight portion 142, the basis weight is also calculated in the same manner as the longitudinal direction X of the low basis weight portion 142.

The high basis weight part 143 is not only larger than the low basis weight part 142, but also has a greater thickness than the low basis weight part 142. The ratio of the thickness of the low basis weight portion 142 to the thickness of the high basis weight portion 143, that is, the thickness of the low basis weight portion 142/the thickness of the high basis weight portion 143 is preferably 30% or more, and more preferably 40% or more, and In addition, it is preferably 90% or less, and more preferably 80% or less.

The thickness of the low basis weight portion 142 itself is preferably 1.5 mm or more, more preferably 2.5 mm or more, and more preferably 4.5 mm or less, and more preferably 4 mm or less.

The thickness of the high basis weight portion 143 itself is preferably 2 mm or more, more preferably 3 mm or more, and more preferably 8 mm or less, and still more preferably 7 mm or less.

The thickness is measured as follows.

<Method of Measuring Thickness>

Cut the sample to a specific size, apply pressure to the measurement site at 5 kPa for 10 minutes, and perform the measurement immediately after weight removal. The measurement site was set to 3 or more points including any one of the ventral part, the lower crotch, and the dorsal part per sheet, and the thickness was obtained by averaging two samples (6 points or more of the measurement site). For example, the diaper 200 is cut along the longitudinal direction X or the transverse direction Y of the diaper 200 with a sharp razor, and the cross section of the cut sample is measured. When it is difficult to measure with the naked eye, for example, a microscope (VHX-1000 manufactured by KEYENCE) can be used to observe the cross-section of the above-mentioned cut sample at a magnification of 20 to 100 times for measurement.

On the other hand, the core high-rigidity region 40H surrounds the outer periphery of the core low-rigidity region 40L of the block structure and the entire area as shown in FIG. 16. The core low-rigidity region 40L and the core high-rigidity region 40H are divided by the low basis weight portion 142 located at the outermost periphery of the core low-rigidity region 40L. In the high-rigidity region 40H of the core, the thickness and basis weight at any position are fixed.

As shown in FIG. 17, in the diaper 200 of this embodiment, the thickness of the core high-rigidity region 40H is substantially the same as the thickness of the high basis weight portion 143 of the core low-rigidity region 40L. However, the relationship between the thickness of the core high rigidity region 40H and the thickness of the high basis weight portion 143 is not limited to this, and any one of them may be relatively large. Specifically, the thickness of the core high rigidity region 40H is preferably 2 mm or more, more preferably 3 mm or more, and more preferably 8 mm or less, and still more preferably 7 mm or less. The thickness measurement method is as described above.

The low basis weight portion 142 and the high basis weight portion 143 of the core low rigidity region 40L are integrally formed as described above. In addition, the block area including the low basis weight portion 142 and the high basis weight portion 143 and the core high rigidity area 40H located on the outer periphery thereof are also integrally formed. In this specification, the term "integral molding" refers to a plurality of parts, such as the low basis weight part 142 and the high basis weight part 143, which cannot be separated from each other without joining methods such as adhesives or thermal fusion, and are integrated with the same material.地 formed. If a plurality of parts of the absorbent core 140 are integrally formed, it has continuity that allows excreted fluids such as urine to move smoothly.

As described above, the absorbent core 140 is formed with the core low-rigidity region 40L and the core high-rigidity region 40H. As a result, the core low-rigidity region 40L has the low basis weight portion including the groove 141 as the formation portion. The block structure of 142 and the high base weight portion 143 is soft. In contrast, the core high rigidity region 40H is harder due to the fixed thickness and basis weight. Therefore, the core low rigidity region 40L has lower rigidity than the core Body high rigidity area 40H.

In this specification, the term "rigidity" refers to the degree of difficulty in bending the constituent members of absorbent articles such as absorbent cores and front materials, and the so-called higher rigidity means that the constituent members are difficult to bend. The method of measuring the rigidity differs according to the type of the constituent member, and the rigidity of the absorbent core can be evaluated based on the bending rigidity measured by the following method. It can be evaluated that the smaller the measured value of the bending rigidity, the lower the rigidity of the measurement object and the easier it is to bend.

<Measuring Method of Flexural Rigidity of Absorbent Core>

Take out the absorbent core from the absorbent article. The "absorbent core" referred to here includes a member mainly composed of an absorbent material such as pulp and water-absorbing polymer particles, and a so-called core-coating material that wraps the member. That is, strictly speaking, the measurement target of this method does not only include the absorbent core, but further includes an absorber made of a core-clad material. However, usually, the bending of the chip The flexural rigidity is extremely small compared to the flexural rigidity of the absorbent core. Therefore, the measured value of the flexural rigidity of the absorbent body can be regarded as the measured value of the flexural rigidity of the absorbent core itself. Furthermore, when the absorbent article taken out of the absorbent core is a new product sealed in a packaging bag, open the packaging bag and leave the taken out absorbent article at room temperature and pressure for more than 1 day, then take out the absorbent Core body. A specific measurement target part is cut out from the taken-out absorbent core to prepare a measurement sample. For example, from each of the core low-rigidity region 40L and the core high-rigidity region 40H in the absorbent core 140 of the diaper 200, 4 rectangular shapes with a length (width) of 20 mm in the transverse direction Y and a length of 50 mm in the longitudinal direction X are cut out Part of it is made into a measurement sample. More specifically, the above-mentioned rectangular-shaped portion is cut every two pieces from each of the ventral portion 1F and the dorsal portion 1R from a position symmetrical in the lateral direction Y. 1R and when the measurement sample cannot ensure the specific size, it can also be cut across the lower part of the crotch 1M.

A softness tester is used to measure the bending rigidity of the sample. For example, a texture tester (softness test method) "HOM-3" manufactured by Daiei Scientific Seiki Mfg. Co., Ltd. can be used. The measurement sample is placed on the support table of the softness tester in such a way that the length direction of the measurement sample is orthogonal to the 30mm width groove engraved on the support table, and the center of the measurement sample is performed with a spatula with a thickness of 2mm Press and measure the force required during the pressing. For example, the bending rigidity is measured for 4 measurement samples of each of the above-mentioned core body low rigidity region 40L and core body high rigidity region 40H, and the average value of the measured values of the 4 measurement samples is set as 40L or 40H in this region The bending rigidity.

The flexural rigidity of the core low rigidity region 40L is preferably 3 g or more, more preferably 4 g or more, and more preferably 10 g or less, and more preferably 9 g or less.

The flexural rigidity of the core high rigidity region 40H is preferably 5 g or more, more preferably 6 g or more, and more preferably 20 g or less, and more preferably 15 g or less.

The difference in bending rigidity between the core low rigidity region 40L and the core high rigidity region 40H is preferably 1 g or more.

The flexural rigidity of each region 40L, 40H of the absorbent core 140 can be adjusted by appropriately adjusting the selection of the core forming material and the basis weight (the arrangement form of the groove 141 in the region 40L).

Hereinafter, the surface sheet 102 (surface material) will be described in detail.

The front sheet 102 has, as shown in FIG. 16, a front sheet low-rigidity region 2L that overlaps the core low-rigidity region 40L and extends in the longitudinal direction X in the top view of the diaper 200, and is located in the front sheet low-rigidity region 2L On both sides of the lateral direction Y, the rigidity is higher than the front material high rigidity area 2H of the front material low rigidity area 2L. Furthermore, in the diaper 200 of this embodiment, the length of the lateral Y of the front sheet 102, that is, the width, is substantially the same as the width of the absorber 4.

As shown in FIG. 17, the front material low rigidity area 2L is located in the center part of the horizontal direction Y of the diaper 200, and a pair of front material high rigidity areas 2H, 2H are located on both sides of the horizontal direction Y with this area|region 2L interposed. In the diaper 200 of this embodiment, a pair of front material high rigidity regions 2H, 2H are formed symmetrically with respect to an imaginary straight line (not shown) that divides the diaper 200 into two parts in the transverse direction Y and extends in the longitudinal direction X. The two regions 2L and 2H with different rigidities are in the longitudinal direction X, preferably formed at least at the lower part of the crotch 1M, and preferably spanning from the lower part of the crotch 1M to any one of the ventral part 1F and the dorsal part 1R Or both are formed, or formed across the entire length of the absorbent body 4, and more preferably formed across the entire length of the longitudinal direction X of the diaper 200 as in this embodiment.

In FIG. 18, the skin facing surface of the front sheet 102 is enlarged and shown. As shown in FIGS. 17 and 18, the front sheet 102 has a convex portion 26 protruding toward the wearer's skin side, and a concave portion 25 existing around the convex portion 26, and is in the low rigidity region 2L of the front material and the front material In the high-rigidity region 2H, the formation patterns of the protrusions 26 and/or the recesses 25 are different. As a result, the difference in the formation pattern of the depressions and protrusions becomes one of the reasons for the difference in rigidity between the front material low-rigidity area 2L and the front material high-rigidity area 2H.

In this specification, the expression "different formation patterns of the protrusions" includes any one of the case where only the arrangement of the protrusions is different, the case where the shapes of the protrusions are different, and the case where the two are different. The different configurations of the convex parts also include the different distances between the convex parts. In addition, the state where the shape of the convex portion is different also includes the case where the shape of the convex portion is different in plan view. In the diaper 200 of this embodiment, as described below, the arrangement and the form of the convex part 26 are different in the front material low rigidity area 2L and the front material high rigidity area 2H. In addition, the meaning of the expression "different formation patterns of the recesses" is substantially the same as the expression "different formation patterns of the protrusions", and the explanation for the aforementioned protrusions can be appropriately applied.

The front sheet 102 is formed by locally performing a well-known embossing process on the entire sheet as its raw material. As a result, the forming material of the entire sheet at the location where the embossing process is performed is compacted. It becomes a concave portion 25, and the portion that has not been embossed protrudes to one side in the thickness direction, specifically to the side facing the skin, and becomes a convex portion 26. In addition, the density of the concave portion 25 is relatively high according to the presence or absence of the embossing. The high-density portion, and the convex portion 26 is the low-density portion with relatively low density. In the front sheet 102, generally, the area where the ratio of the recesses 25 is greater (the ratio of the protrusions 26 is less) is harder and harder to bend.

In this way, there is a density difference between the concave portion 25 and the convex portion 26, so the "formation pattern of the concave portion 25", such as the top view shape, area (embossed area), position, etc. of the concave portion, and the "formation pattern of the convex portion 26", such as convex Both the shape, size, and position of the portion 26 affect the rigidity of the front sheet 102. For example, between the two regions to be compared in the front sheet 102, even if the formation positions of a plurality of convex portions 26 are the same, when the area ratio of the concave portion 25 is different, the area ratio of the concave portion 25 is relatively larger. It can become the high rigidity area 2H of the front material. In addition, even if the area ratio of the concave portion 25 is the same between the two regions for comparison, when the formation position of the convex portion 26 is different, there will be a difference in rigidity between the two regions, resulting in low rigidity of the front material Area 2L and high rigidity area of the front material 2H. Therefore, in order to create a difference in rigidity between one part and the other part of one front sheet 102 to form a front material low rigidity area 2L and a front material high rigidity area 2H, the following method is more effective, that is, in the other part and the other part , The formation pattern of the recesses 25 and the formation pattern of the protrusions 26 are made different or both.

The rigidity of each part of the surface sheet (front material) can be evaluated by the bending rigidity measured by the following method. It can be evaluated that the smaller the measured value of the bending rigidity, the lower the rigidity of the measurement object and the easier it is to bend.

<Method for Measuring the Bending Rigidity of Front Sheets>

According to the ring crush method JIS P8126. Specifically, a specific measurement target portion is cut out from the front sheet to prepare a measurement sample. For example, from each of the front material low-rigidity area 2L and the front material high-rigidity area 2H of the front sheet 102, a rectangular portion with a length of 30 mm in the longitudinal direction X and a length of 110 mm in the transverse direction Y is cut to make a test piece. A sheet, the skin facing surface of the test sheet is set to the outside, and the test sheet is rolled into a cylindrical shape in the longitudinal direction of the test sheet, and one end and the other end of the test sheet in the longitudinal direction are fixed by ultrasonic sealing, and Make a cylindrical measuring sample with a height of 30mm. The produced cylindrical measurement sample is erected in such a way that its axial direction coincides with the vertical direction, and the measurement sample is compressed from its upper end side in the axial direction at a compression speed of 10 mm/min using a compression tester, and Record the maximum load shown during the compression. Prepare 5 measurement samples for each measurement target area and measure the maximum load of each, and set the average value of them as the measurement target area (for example, the front material low rigidity area 2L or the front material high rigidity area 2H ) Is the value of bending rigidity.

The ratio of the flexural rigidity of the front material high rigidity area 2H to the flexural rigidity of the front material low rigidity area 2L is the latter/the former, and is preferably 1.1 or more, and more preferably 1.2 or more.

The bending rigidity of the front material high rigidity area 2H is greater than the bending rigidity of the front material low rigidity area 2L As a prerequisite, the bending stiffness is preferably 10 cN or more, more preferably 15 cN or more, more preferably 50 cN or less, still more preferably 40 cN or less, more preferably 10 cN or more and 50 cN or less, and more preferably 15 cN Above and below 40cN.

The flexural rigidity of the front material low-rigidity area 2L is based on the premise that it is less than the flexural rigidity of the front material high-rigidity area 2H, and is preferably 40 cN or less, more preferably 30 cN or less, more preferably 5 cN or more, and more preferably 10 cN or more, more preferably 5 cN or more and 40 cN or less, and more preferably 10 cN or more and 30 cN or less.

In FIG. 19, a part of the front material low rigidity area 2L of the front sheet 102 is enlarged and shown, and in FIG. 20, a part of the front material high rigidity area 2H of the front sheet 102 is enlarged and shown. The surface sheet 102 in the diaper 200 of this embodiment is a composite sheet including a laminate of two sheets 20 and 21. The front sheet 102 is in either of the two regions 2L and 2H. The laminated first sheet 20 and the second sheet 21 are partially joined by embossing to form a plurality of joints, namely The concave portion 25 (high-density portion), the first sheet 20 protrudes away from the second sheet 21 at a location other than the concave portion 25, and forms a convex portion 26 (low-density portion) protruding toward the wearer's skin side. In the recess 25, the two sheets 20 and 21 are integrally pressurized by embossing. The sheets 20 and 21 are thermally fused. The surface sheet 102 is in either of the two regions 2L and 2H, the surface on the second sheet 21 side is substantially flat, and the first sheet 20 side has large undulations.

The first sheet 20 and the second sheet 21 include sheet materials. As the sheet material, for example, in addition to non-woven fabrics such as hot-air non-woven fabrics or spun-bonded non-woven fabrics, woven fabrics, woven fabrics and other fibrous sheets, a film or the like can be used. It is better to use non-woven fabrics. The types of the sheet materials constituting the two sheets 20 and 21 may be the same or different. The basis weight of the non-woven fabric used as the sheet material constituting the two sheets 20, 21 is preferably 10 g/m ² or more, more preferably 15 g/m ² or more, and more preferably 40 g/m ² or less, and further Preferably it is 35 g/m ² or less.

In the low-rigidity region 2L of the front material and the high-rigidity region 2H of the front material, the main differences related to the formation pattern of the protrusions 26 include the following points, namely, as shown in FIGS. 17-20, the front material The low-rigidity area 2L has a continuous convex portion 27 of a shape in which a plurality of small convex portions 27A, 27B are connected in the lateral direction Y as the convex portion 26 (low-density portion). On the other hand, the front material high-rigidity area 2H does not have such a continuous A convex portion, but a plurality of convex portions 26H exist independently as the convex portion 26.

In the low-rigidity region 2L of the front material, as shown in FIGS. 17 to 19, the continuous convex portions 27 continuously extending in the horizontal direction Y are formed in plural with a certain interval in the vertical direction X. Regarding the continuous convex portion 27, a plurality of small convex portions 27A and 27B are connected to each other to be formed. In this specification, the so-called "convex part connection" means that two adjacent convex parts (small convex parts) are not separated by the concave part 25 (joining part), but a part of one convex part constitutes the other convex part. A part of the convex part and a part of the other convex part constitute a part of one of the convex parts.

The existence of such continuous convex portions 27 continuously extending in the transverse direction Y greatly contributes to maintaining the three-dimensional structure of the front sheet 102 during the wearing of the diaper 200. That is, during the wearing of the diaper 200, especially the lower part of the crotch 1M, the wearer’s thighs are compressed by the external force applied from the two outer sides of the transverse direction Y. As a result, due to the compression from the transverse direction Y, the front sheet The three-dimensional structure of the material 102 including the concave portion 25 (high-density portion) and the convex portion 26 (low-density portion) is crushed, and there is a concern that the three-dimensional structure may not be able to exert its original function and effect. For example, when a continuous convex portion (not shown) extending in the longitudinal direction X is formed on the front sheet 102, that is, a continuous convex portion whose extending direction differs from the continuous convex portion 27 by 90°, if the continuous convex portion When compressed from the lateral direction Y, the plurality of small convex portions constituting the continuous convex portion are respectively compressed in the lateral direction Y, and therefore the degree of deformation caused by the compression as a whole of the continuous convex portion is relatively large. In contrast, the continuous convex portion 27 extends along the transverse direction Y, which is easily compressed during wearing of the diaper 200. Therefore, even if an external force is applied from both outer sides of the transverse direction Y, When compressed, it is not easy to be crushed, and it is easy to maintain its three-dimensional structure. Therefore, by forming the continuous convex portion 27 continuously extending in the lateral direction Y on the front sheet 102, it is easy to maintain the original texture of the front sheet 102, and it is easy to maintain the texture of the wearer's skin under the crotch and liquid leakage. The performance can be expected to improve.

In the present embodiment, as shown in FIGS. 17 and 19, the continuous convex portion 27 is alternately connected in the lateral direction Y to form two types of small convex portions 27A and 27B having different heights. The height of the small convex portion 27A is relatively high, and the height of the small convex portion 27B is relatively low. Either one of the two convex portions 27A, 27B has a substantially circular shape in a plan view, and has a shape having a top in a cross section in any one of the longitudinal direction X and the lateral direction Y. In addition, the continuous convex portion 27 is hollow, and the hollow portion extends continuously across substantially the entire length of the continuous convex portion 27 in the lateral direction Y.

Furthermore, in the present embodiment, the continuous convex portion 27 is continuous across the entire length of the lateral direction Y of the front material low rigidity region 2L, but the shape of the continuous convex portion 27 is not limited to this. For example, a plurality of continuous protrusions 27 are arranged linearly in a row with a certain interval in the transverse direction Y, and the row of protrusions including the plurality of continuous protrusions 27 can also cross the low rigidity area of the front material in the transverse direction Y Formed in 2L way.

As shown in Figs. 18 and 19, the front material low rigidity area 2L has a continuous convex portion 27 and a plurality of surrounding areas surrounded by concave portions 25 (high-density portions), that is, the joining portions of the sheets 20 and 21 The convex portion 26L serves as the convex portion 26 (low-density portion). Each convex portion 26L is formed in an area surrounded by a total of six concave portions 25, and has a shape having a top in a cross section in any one of the longitudinal direction X and the lateral direction Y. The height of each convex portion 26L is lower than the small convex portion 27A (small convex portion with relatively high height) constituting the continuous convex portion 27. Furthermore, in this embodiment, each convex part 26L is hollow, but it may not be a hollow structure, but a solid structure filled with the forming material of the front sheet 102 inside.

In the front material low-rigidity region 2L, as shown in FIG. 18 and FIG. 19, a plurality of protrusions 26L are arranged linearly in a row at a predetermined interval in the lateral direction Y to form a row of protrusions. In addition, the small convex portions 27B (small convex portions with relatively low height) constituting the continuous convex portion 27 are also a plurality of which are arranged linearly in a row at a certain interval in the lateral direction Y to form a convex portion row. In addition, the rows of convex portions formed by the plurality of convex portions 26L and the continuous convex portions 27 are alternately and linearly arranged along the longitudinal direction X, and one convex portion 26L and one small convex portion 27B are arranged in the horizontal direction Y Formed in the same location.

The front material high rigidity area 2H is as shown in FIGS. 17, 18 and 20, and has a plurality of convex parts 26H surrounded by concave parts 25 (high-density parts), that is, the joining parts of the sheets 20 and 21. Each convex portion 26H is formed in an area surrounded by a total of six concave portions 25, and has a shape having a top in a cross section in any one of the longitudinal X and the transverse Y. The height of each convex portion 26H is lower than the small convex portion 27A (small convex portion with relatively high height) constituting the continuous convex portion 27. Furthermore, in this embodiment, each convex part 26H is hollow, but it may not be a hollow structure, but a solid structure filled with the forming material of the front sheet 102 inside.

In the high rigidity region 2H of the front material, the convex part 26H is formed in the shape of scattered dots in plan view, as shown in FIG. 18 and FIG. That is, in the high-rigidity region 2H of the front material, the convex portion row formed by linearly arranging a plurality of convex portions 26H in a row with a certain interval in the horizontal direction Y is arranged in the vertical direction X, and in the horizontal direction Y Above, in the adjacent rows of convex portions, the convex portions 26H are staggered from each other. In other words, in the high-rigidity region 2H of the front material, the plurality of convex portions 26H are arranged linearly with a certain interval in the longitudinal direction X, and the plurality of convex portions 26H are arranged along the transverse direction orthogonal to the longitudinal direction X. During Y projection, the projection image of the projection 26H in another projection row adjacent to the specific projection row in the lateral Y is arranged between the projection images of each projection 26H in the specific projection row ( For example, in the method of the middle position of two adjacent convex parts 26H and 26H in a specific convex part row, a plurality of convex parts 26H are arranged in a staggered shape.

The front sheet 102 having the above-mentioned structure can be manufactured according to, for example, the method for manufacturing a composite sheet described in Japanese Patent Application Laid-Open No. 2015-112343. Specifically, it can be obtained by, for example, a method in which a belt-shaped first sheet 20 is fed between a first roller and a second roller having a shape in which the peripheral surfaces are meshed with each other, so that the first sheet The material 20 is deformed into a concave-convex shape, and then the first sheet 20 is moved along the peripheral surface of the first roller from the meshing portion, and then the second sheet 21 is fed so as to overlap with the first sheet 20, and the two sheets 20 , 21 is pressed under heating between the convex part of the first roller and the heat roller to locally join them. At this time, the first roller and the second The uneven shape of the two rollers and the pattern of the joint formed by the first roller and the heat roller are different. When the first sheet 20 is bitten into the meshing portion of the first roller and the second roller to deform into a concave-convex shape, it is preferable to attract the first sheet 20 toward the inner direction of the roller to promote the first sheet 20 Deformation of concave-convex shape.

As one of the main features of the diaper 200 of the present embodiment, the following aspects can be cited. That is, as shown in FIGS. 16 and 17, the front sheet 102 has the core low-rigidity region 40L overlapped with the core low-rigidity region 40L in a plan view and extends along the longitudinal direction X. The extended front material low-rigidity area 2L and the front material high-rigidity area 2H located on both sides of the lateral Y, and the front material high-rigidity area 2H and the core high-rigidity area 40H overlap in a plan view. That is, in the diaper 200, the low-rigidity region 2L of the frontal material with relatively low rigidity in the surface sheet 102 and the low-rigidity core region 40L of the absorbent core 140 with relatively low rigidity are tied in the transverse direction of the diaper 200 The central part of Y overlaps in the thickness direction, and the high rigidity region 2H of the front material in the front sheet 102, which has relatively high rigidity, and the high rigidity region 40H of the core which has relatively high rigidity in the absorbent core 140. The two sides of the transverse direction Y of the diaper 200 overlap in the thickness direction. That is, when the high rigidity area 2H of the front material is projected along the thickness direction of the diaper 200, at least a part of this area 2H overlaps the high rigidity area 40H of the core body, and the low rigidity area 2L of the front material is along the diaper. When projecting in the thickness direction of 200, at least a part of the area 2L The points overlap with the core low-rigidity region 40L.

In the diaper 200, as described below, the boundary between the core low-rigidity region 40L and the core high-rigidity region 40H (a pair of grooves 141, 141 located on the outermost side of the transverse direction Y) is defined by the lower span and its entire length in a plan view. It overlaps the boundary 28 between the front material low rigidity area 2L and the front material high rigidity area 2H. Therefore, the front material low rigidity area 2L and the core low rigidity area 40L are integrally overlapped in a plan view (refer to FIGS. 16 and 17) . In addition, as described above, the side edges 2S and 2S of the front sheet 102 coincide with the side edges along the longitudinal direction X of the maximum width portion of the absorbent core 140. Therefore, the entire core high rigidity region 40H is The front material high rigidity area 2H overlaps in a plan view.

In this way, if the front material low-rigidity region 2L overlaps with the core low-rigidity region 40L, the center part of the diaper 200 in the transverse direction Y (especially the center part of the absorbent core 140 in the transverse direction Y) is relatively low in rigidity. And the front material high-rigidity area 2H overlaps with the core high-rigidity area 40H, and the two sides of the central part (especially the two sides of the horizontal Y of the absorbent core 140) are relatively high rigidity. When the wearer’s thighs are compressed from the two outer sides of the lateral direction Y during the wearing of the diaper 200, the central part is crushed and relatively deformed. In contrast, the two side parts are not easily crushed. The degree of deformation is relatively small. Therefore, it is easy to maintain the original three-dimensional structure of the front material high rigidity area 2H of the front sheet 102 and the core high rigidity area 40H of the absorbent core 140 existing on both sides. Moreover, in this way, the three-dimensional structure of the lateral Y sides of the diaper 200 is maintained without being substantially crushed during the wearing of the diaper 200, and the skin feel of the lower part of the crotch 1M becomes better, and the excretion of the wearer can be suppressed. With respect to the 1M of the lower part of the crotch, the excretion liquid, such as urine, is splashed to the non-presumed part, so-called liquid splash, so it can effectively prevent leakage.

From the viewpoint of making use of the superposition of the front material high rigidity area 2H and the core high rigidity area 40H (overlap of the front material low rigidity area 2L and the core low rigidity area 40L) more reliably exerted, The entire area of one of the high rigidity regions 40H and 40H of a pair of cores The ratio of the area of the overlapped portion of the front material high rigidity region 2H overlapping with the one occupied by the one is preferably 50% or more, and more preferably 70% or more. From the same viewpoint, the ratio of the area of the overlapping portion of the low-rigidity region 2L of the front material to the entire area of the low-rigidity core region 40L is preferably 60% or more, and more preferably 80% or more. In the diaper 200 of this embodiment, the above-mentioned ratios are all 100%.

In addition, especially in the diaper 200 of this embodiment, as described above, the low-rigidity region 2L of the front material existing in the center part of the transverse direction Y of the diaper 200 is formed with a continuous convex portion continuously extending in the transverse direction Y 27. Therefore, although the front material low-rigidity area 2L is in a state where it is easily compressed during wearing of the diaper 200 due to the influence of the core low-rigidity area 40L overlapping with the thickness direction, the front material low-rigidity area 2L is likely to be compressed during wearing. The original three-dimensional structure is maintained. Therefore, the front sheet 102 is easy to maintain the original texture, and further improvement in performance can be expected in terms of the touch to the wearer's skin under the crotch and leakage.

From the viewpoint of more reliably exerting the effects obtained by using the front sheet 102 and the absorbent core 140 as described above, the skin facing surface of the core low-rigidity region 40L (the formation region of the block structure) The ratio of the area of 40a to the entire area of the skin facing surface 40a of the absorbent core 140 is preferably 20% or more, more preferably 30% or more, more preferably 70% or less, and more preferably It is less than 60%.

In the diaper 200 of this embodiment, as shown in FIG. 18, a plurality of protrusions 26 (26L, 27) are intermittently formed in the longitudinal direction X in the low-rigidity region 2L of the front material at a predetermined pitch P4. As shown in FIG. 16, in the low rigidity region 40L of the core body, a plurality of grooves 141, that is, a low basis weight portion 142, are intermittently formed at a predetermined pitch P5 in the longitudinal direction X. As a result, the diaper 200 in the longitudinal direction X is fitted From the viewpoint of improving performance, the ratio of pitch P5 to pitch P4 is set to pitch P5/pitch P4, and is preferably 2 or more, more preferably 3 or more, and preferably 7 or less, and still more preferably It is 6 or less.

In addition, from the same point of view and the point of view that the above-mentioned functions and effects obtained by using the continuous convex portions 27 can be exerted more reliably, the distance P6 (refer to FIG. 18) between the continuous convex portions 27 is preferably 3 mm or more, and more preferably 4 mm As above, it is preferably 9 mm or less, and more preferably 8 mm or less.

Moreover, in the diaper 200 of this embodiment, as shown in FIG. 16, the boundary between the core low-rigidity region 40L and the core high-rigidity region 40H (located on the outermost pair of grooves 141, 141 in the lateral direction Y) as shown in FIG. It overlaps the boundary 28 of the front material low rigidity area 2L and the front material high rigidity area 2H. That is, when the groove 141 at the boundary between the forming area 40L and the area 40H in the absorbent core 140 is projected in the thickness direction of the diaper 200, at least a part of the groove 141 and the area 2L in the front sheet 102 are The junction 28 of area 2H overlaps. In the diaper 200, the groove 141 and the junction 28 overlap across the entire length thereof. With this configuration, when the wearer’s thigh is compressed from the outer side of the lateral direction Y during the wearing of the diaper 200, the overlapping part of the two junctions 28 and 141 is easy to form a curved part, thereby making it easy to maintain the presence The three-dimensional structure of the constituent members on both sides of the diaper 200 in the transverse direction Y (the front material high-rigidity area 2H, the core high-rigidity area 40H), and the central part of the diaper 200 in the transverse direction Y (the front material low-rigidity area 2L, the core The body low rigidity area 40L) is easy to bend and deform.

Furthermore, in the diaper 200 of this embodiment, the boundary 28 between the low-rigidity region 2L of the frontal material and the high-rigidity region 2H of the frontal material in the front sheet 102, and the low-rigidity core region 40L of the absorbent core 140 and The boundary of the core high-rigidity region 40H (a pair of grooves 141, 141 located on the outermost side of the transverse direction Y) overlaps across the entire length of the two boundaries 28, 141, but it can also be another embodiment as shown in FIG. 21 Generally, the boundary 28 in the front sheet 102 and the boundary in the absorbent core 140 (the outermost groove 141 in the transverse direction Y) partially overlap. In FIG. 21, the absorbent core 40A in another embodiment of the absorbent article of this invention (2nd invention) is shown. In addition, another embodiment shown in FIG. 21 will be mainly described with different components from the above-mentioned diaper 200, and the same components will be explained. Some parts are marked with the same symbols and the description is omitted. The components of the other embodiment shown in FIG. 21 that are not specifically described can be suitably applied to the description of the diaper 200.

In another embodiment shown in FIG. 21, the dotted line indicated by the symbol 28 is the boundary between the front material low rigidity area 2L and the front material high rigidity area 2H, which is not shown, and spans the absorbent core 40A. The entire length of the longitudinal direction X extends along the longitudinal direction X. As shown in FIG. 21, in the ventral portion 1F and the dorsal portion 1R, the boundary between the core low-rigidity region 40L and the core high-rigidity region 40H, that is, in the ventral portion 1F and the dorsal portion 1R, is located in the transverse direction Y The outermost pair of grooves 141, 141 are located on the outer side of the transverse direction Y than the boundary 28 between the low rigidity area 2L of the front material and the high rigidity area 2H of the front material. In the lower part 1M of the crotch, the core low rigidity area 40L and the core The boundary of the high-rigidity region 40H, that is, the pair of grooves 141 and 141 located at the outermost side in the lateral direction Y in the lower part 1M of the crotch are located more inside the lateral direction Y than the boundary 28 in the front sheet 102. According to another embodiment shown in FIG. 21, the same effect as the above-mentioned diaper 200 can also be exhibited.

As mentioned above, the present invention (first invention) has been described based on its preferred embodiments, but the present invention (first invention) is not limited to the above-mentioned embodiments. For example, as a surface sheet of an absorbent article, the first joining portion 31 and the second joining portion 32 in the central region M of the composite sheet 10 may have the same width in the second direction Y, and the width in the second direction Y The two directions Y are alternately arranged at equal intervals at intervals.

In addition, the elastic member 19 that shrinks the absorbent article in the width direction of the article, which is the width direction thereof, may also be arranged only in the center of the width direction of the back side portion, for example, the rectangular shape of the elastic member arrangement area is shown in FIG. 1 Within the box. In addition, the number of elastic members arranged in the elastic member arrangement area BM may also be only two.

In addition, as an elastic member that shrinks the absorbent article in the longitudinal direction of the article as its longitudinal direction, it is also possible to arrange only the elastic member 15a forming the three-dimensional pleats and the elastic member forming the leg pleats Any one of 16. In addition, the elastic member 15a forming the three-dimensional pleats and the elastic member 16 forming the leg pleats may each be arranged only one on the left and right sides of the absorbent article, or plural pieces may be arranged on each. Moreover, it is not necessary to arrange|position the elastic member which shrinks an absorbent article in the article longitudinal direction which is its longitudinal direction.

In addition, the absorbent article of the present invention (first invention) may be a shorts type (pull on type) disposable diaper instead of an unfolded disposable diaper, and may also be a shorts type or a normal non-disposable diaper. Shorts-type menstrual sanitary napkins can also be incontinence pads, sanitary pads, etc.

In addition, the present invention (second invention) has been described, but the present invention (second invention) is not limited to the above-mentioned embodiment, and can be appropriately modified without departing from the gist of the present invention (second invention). For example, for the purpose of preventing the migration of excreted fluid from the absorbent core 140 to the wearer's skin side (so-called liquid back), it may be interposed between the front sheet 102 and the absorber 4 (the core covering material 45). The placement configuration is also called the secondary layer and other liquid-permeable antibody liquid countercurrent layer. In addition, the surface sheet 102 in the above-mentioned embodiment includes a laminate of two sheets 20 and 21, but may include one sheet.

The absorbent article of the present invention (the second invention) is not limited to the unfolded disposable diaper as in the above-mentioned embodiment, but broadly encompasses the absorption of body fluids (urine, menstrual blood, soft stools, sweat, etc.) discharged from the human body The items may also include shorts-type disposable diapers, menstrual sanitary napkins, menstrual shorts, etc.

Regarding the above-mentioned embodiment, the present invention (first invention) further discloses the following absorbent articles.

<1>

An absorbent article comprising a front sheet including a composite sheet, a back sheet, and an absorbent body arranged between the two sheets, and the composite sheet has a first sheet along the length of the article. Direction and the second direction along the width direction of the article, and the laminated first sheet and second sheet are partially joined to form a plurality of joints. The first sheet is located away from the 2 The direction of the sheet is protruding, and the shape is The composite sheet has a convex portion protruding toward the skin side of the wearer; and the composite sheet has a central area where the convex portions are formed in different patterns and a pair of side areas located on both sides of the central area; and The height of the convex portion with the largest height in the central region, that is, the central first convex portion, is higher than the convex portion with the largest height in the side region, that is, the first side convex portion; and the amount of compression deformation in the central region is greater than that of the side portions The amount of compression deformation of the area.

<2>

The absorbent article of the above item <1>, wherein a plurality of rows of central continuous convex portions including the central first convex portion are formed in the central area, and the convex portions are formed in scattered dots in the side area .

<3>

The absorbent article of the above item <1> or <2>, wherein a plurality of rows of central continuous convex portions are formed in the central region; The central second convex parts of one convex part are connected alternately, or only a plurality of the above-mentioned central first convex parts are connected.

<4>

The absorbent article as in the above item <2> or <3>, wherein the central continuous convex portion extends in the second direction respectively; and the first convex portion of the side portion in the side region is regarded as in the side region When the composite sheet is assumed to have a plurality of parallel first imaginary straight lines and a plurality of parallel second imaginary straight lines that have an angle with the first imaginary straight line, they are located between the first imaginary straight line and the second imaginary straight line. Points of intersection of imaginary straight lines.

<5>

The absorbent article according to any one of the above <1> to <4>, wherein in the central region, a central third convex portion having a height lower than that of the central first convex portion is formed; and the central third convex portion is The arrangement position in the first direction is located between the center first convex portions, and the height thereof is equal to the height of the side first convex portions.

<6>

The absorbent article according to any one of the above <1> to <5>, wherein in the central region, a central third convex portion having a height lower than that of the central first convex portion is formed; and the central third convex portion is A plurality of them are formed along the second direction, and a longitudinally long joint part having a shape that is longer in the first direction is formed between adjacent central third convex parts in the second direction.

<7>

The absorbent article of any one of the above <1> to <6>, wherein the height of the first convex portion in the center is relative to the height of the first convex portion in the side portion, preferably 105% or more, more preferably It is 110% or more, more preferably 200% or less, and more preferably 150% or less.

<8>

The absorbent article according to any one of the above <1> to <7>, wherein the height of the first central convex portion is preferably 0.5 mm or more, more preferably 1 mm or more, more preferably 5 mm or less, and further Preferably it is 4 mm or less.

<9>

The absorbent article according to any one of the above <1> to <8>, wherein the height of the first convex portion of the side portion is preferably 0.3 mm or more, and more preferably 0.6 mm or less Above, it is more preferably 4 mm or less, and more preferably 3 mm or less.

<10>

The absorbent article according to any one of the above <1> to <9>, wherein the difference between the height of the first convex portion at the center and the height of the first convex portion at the side is preferably 0.1 mm or more, more preferably 0.2 mm or more, more preferably 2 mm or less, and still more preferably 1 mm or less.

<11>

The absorbent article of any one of the above <1> to <10>, wherein a plurality of rows of central continuous convex portions are formed in the central region; and the central first convex portion constituting the central continuous convex portion has a low height It is preferable that the central second convex portion of the central first convex portion has a cavity at least on the back side of the central first convex portion 41.

<12>

The absorbent article of any one of the above <1> to <11>, wherein a plurality of rows of central continuous convex portions are formed in the central region; and the central first convex portion and height constituting the central continuous convex portion There are cavities on the back side of each of the central second convex portions lower than the central first convex portion, and the cavity on the back surface of the central first convex portion is continuous with the cavity on the back surface of the central second convex portion, On the back side of the central continuous convex portion, a continuous hollow portion continuously extending in the second direction is formed.

<13>

The absorbent article according to any one of the above items <1> to <12>, wherein the first joining portion in a rectangular shape is arranged in a row by aligning the long side with the first direction and spaced apart along the second direction , A row of first joints along the second direction is formed.

<14>

The absorbent article as described in any one of <1> to <13>, wherein one of the two orthogonal sides is aligned with the second direction, and the other side is aligned with the first direction, and is aligned along the second direction. The second joint portions arranged in a row at intervals in the direction are formed with a second joint portion row along the second direction.

<15>

The absorbent article according to any one of the above items <1> to <14>, wherein the first joint in a rectangular shape is arranged in a row by making its long side coincide with the first direction and spaced apart in the second direction Portion, formed with a row of first joining portions along the second direction; and by making one of the two orthogonal sides coincide with the second direction, the other side coincides with the first direction, and is spaced apart along the second direction The second joint parts arranged in a row at intervals are formed with a second joint part row R2 along the second direction; and in each first joint part row, the arrangement interval of the first joint parts in the second direction is constant, In each row of the second joining portion, the arrangement interval of the second joining portion in the second direction has two types of intervals, and there are alternately wider portions and narrower portions.

<16>

The absorbent article of any one of the above items <1> to <15>, wherein the first joint in a rectangular shape is arranged in a row by making its long side coincide with the first direction and spaced apart in the second direction Portion, formed with a row of first joining portions along the second direction; and by making one of the two orthogonal sides coincide with the second direction, the other side coincides with the first direction, and is spaced apart along the second direction The second joints arranged in a row at intervals are formed with a second joint row R2 along the second direction; and in each of the first joints rows, the first joints when viewed in the second direction The arrangement positions are all the same, and the rows of each of the above-mentioned second joints are also the above-mentioned when viewed in the second direction. The arrangement positions of the second joints are all the same.

<17>

The absorbent article of any one of the above items <1> to <16>, wherein the first joint in a rectangular shape is arranged in a row by making its long side coincide with the first direction and spaced apart in the second direction Portion, formed with a row of first joining portions along the second direction; and by making one of the two orthogonal sides coincide with the second direction, the other side coincides with the first direction, and is spaced apart along the second direction The second joining parts arranged in a row at intervals are formed with a second joining part row R2 along the second direction; A total of four of the second joints in the row of the second joints are arranged around the first joints, and are arranged close to each other so that the corners of each are opposed to the four corners of the first joints.

<18>

The absorbent article according to any one of the above items <1> to <17>, wherein the first joints are arranged in a row in a rectangular shape by making their long sides coincide with the first direction and spaced apart in the second direction Portion, formed with a row of first joining portions along the second direction; and by making one of the two orthogonal sides coincide with the second direction, the other side coincides with the first direction, and is spaced apart along the second direction The second joints arranged in a row at intervals are formed with a second joint row R2 along the second direction; and are formed with a first joint and four second joints located around it. In each embossing area E, a plurality of the same joining part groups are formed at regular intervals along the second direction.

<19>

Absorbent articles such as any one of <1> to <18> above, wherein The central region of the composite sheet is formed with the central first convex portion, the central second convex portion, the central third convex portion, and the first central convex portion having a height lower than the central first convex portion on the first sheet constituting it. 4 convex parts; and if you also focus on the central second convex part, the central third convex part and the fourth convex part whose height is lower than the above central first convex part, then the three kinds of convex parts are based on the center The second convex portion, the fourth convex portion, the central third convex portion, and the fourth convex portion are arranged regularly and linearly in the first direction in this order.

<20>

The absorbent article according to any one of the above <1> to <19>, wherein the central region of the composite sheet is formed with the central first convex portion on the first sheet constituting it, and the height is lower than the The central second convex portion, the central third convex portion, and the fourth convex portion of the central first convex portion, and the height of the fourth convex portion is lower than that of the central first convex portion, the central second convex portion, and the central first convex portion. Any of 3 convex parts.

<21>

The absorbent article according to any one of the above <1> to <20>, wherein in the side region of the composite sheet, a plurality of rows are formed in the first direction at regular intervals of two types along the second direction A row of second-direction joints where the third joint is arranged.

<22>

The absorbent article of the above item <21>, wherein the row of second-direction joints has a first interval and a second interval wider than the first interval, as the third joint in the second direction between each other Intervals, the plurality of third joints in the row of joints in the second direction are intermittently arranged in the second direction so as to alternately have the two kinds of spaces in the second direction.

<23>

The absorbent article of the above item <21> or <22>, wherein the plurality of the third engaging parts constituting each of the second direction engaging part rows have the same length and arrangement position in the first direction, and in the first direction A gap of a fixed width is formed between adjacent rows of the above-mentioned second-direction joint portions.

<24>

The absorbent article of any one of <21> to <23> above, wherein a plurality of rows of the second direction joining portion rows formed in the first direction are every other row and the third joining in the second direction The disposition positions of the parts are the same, and the disposition positions of the third joint parts in the second direction of the adjacent second-direction joint part rows are different from each other.

<25>

The absorbent article of any one of the above <21> to <24>, wherein as the second direction joint part row, the arrangement positions of the third joint part in the second direction are alternately formed in the first direction The first joining portion row in the second direction and the second joining portion row in the second direction are different from each other, and regarding the arrangement position of the third joining portion in the second direction, the first joining portion row in the second direction and the second direction The second joining portion row is one pair of the third joining portions adjacent to each other at the first interval in the other joining portion row between the third joining portions adjacent to each other at the second interval in one of the joining portion rows.

<26>

The absorbent article of any one of the above <1> to <25>, wherein the composite sheet in the side region is assumed to have a plurality of first imaginary straight lines parallel to each other, and the first imaginary line When there are a plurality of second imaginary straight lines parallel to each other with an angle between the straight lines, the angle θ formed by the first imaginary straight line and the second imaginary straight line is preferably 30° or more and 165° or less, more preferably 45° or more and 150° or less.

<27>

The absorbent article of any one of the above <1> to <26>, wherein the composite sheet in the side region is assumed to have a plurality of first imaginary straight lines parallel to each other and the first imaginary line When there are a plurality of second imaginary straight lines parallel to each other with an angle between the straight lines, in the side area of the composite sheet, there are formed a plurality of third-direction convex portions rows, which are the first side portions of the plurality of side portions. The convex portions are arranged in series along the above-mentioned first imaginary straight line at fixed intervals; and a plurality of fourth-direction convex portion rows are formed by a plurality of the above-mentioned side first convex portions at fixed intervals along the above-mentioned second imaginary straight line string Listed.

<28>

The absorbent article of the above item <27>, wherein between adjacent rows of convex portions in the third direction, a plurality of pairs of joint portions are formed in series with a fixed interval in the third direction joint portion rows; Between the adjacent rows of fourth-direction convex portions, there are formed fourth-direction joint portion rows in which a plurality of joint portion pairs are arranged in series at a fixed interval.

<29>

The absorbent article according to any one of the above <1> to <28>, in which minute protrusions are formed in the side region; and the height of the minute protrusions is less than 1/3 of the first protrusion on the side.

<30>

The absorbent article of any one of <1> to <29> above, which has a ventral part arranged on the wearer's ventral side when worn, and a dorsal part arranged on the wearer's back side when worn , And disposable diapers located at the lower part of the crotch between the ventral and dorsal parts; and A plurality of elastic members for shrinking the disposable diaper in the width direction are arranged at least in the width direction central part of the back side part at intervals in the longitudinal direction of the disposable diaper; and the above-mentioned disposable diaper is arranged The elastic member arrangement area of a plurality of elastic members is arranged with the central area of the composite sheet, and the elastic member arrangement area respectively extends in the second direction to form a center constituted by a plurality of rows including the central first convex portion Continuous convex portion; and when the width of the central continuous convex portion is set to P1, the interval between the elastic members is set to P2, and the interval between the central portions of the central continuous convex portion is set to P3, P1<P2 is satisfied <P3 relationship.

<31>

The absorbent article of any one of the above <1> to <30>, wherein a plurality of rows of central continuous convex portions are formed in the central region; and the central continuous convex portions adjacent in the first direction are between each other Longitudinal joints of a shape elongated in the first direction are formed at equal intervals in the second direction.

<32>

The absorbent article as in the above item <31>, wherein the length along the first direction of the first joining portion 31 as the longitudinal joining portion is preferably 1.2 times or more, particularly 1.5 times or more, of the length along the second direction, Moreover, it is preferably 5 times or less, and particularly preferably 3 times or less.

<33>

The absorbent article of the above-mentioned <31> or <32>, wherein the length of the first joint 31 as the longitudinal joint part in the first direction is preferably 1.2 times the length of the second joint part in the first direction Above, more preferably 1.5 times or more, more preferably 5 times or less, Especially preferably, it is 3 times or less.

<34>

The absorbent article according to any one of the above <31> to <33>, wherein the length of the first joint part as the longitudinal joint part along the first direction is preferably 0.5 mm or more, particularly preferably 1 mm or more, and , Preferably 10 mm or less, particularly preferably 5 mm or less.

<35>

The absorbent article of any one of the above items <1> to <34>, wherein one of the two orthogonal sides is aligned with the second direction, and the other side is aligned with the first direction, and is separated in the second direction. The length of the second joints arranged in a row at intervals along the first direction is preferably 0.1mm or more and 5mm or less, more preferably 0.5mm or more and 3mm or less, and the length along the second direction is preferably 0.1mm or more And 5 mm or less, particularly preferably 0.5 mm or more and 3 mm or less.

<36>

The absorbent article according to any one of the above <1> to <35>, wherein the length of the third joint formed in the side region of the composite sheet along the first direction is preferably 0.1 mm or more and 5 mm Below, more preferably 0.5 mm or more and 3 mm or less, and the length along the second direction is preferably 0.1 mm or more and 5 mm or less, and particularly preferably 0.5 mm or more and 3 mm or less.

<37>

The absorbent article of the above-mentioned <36>, wherein the third joining part is regularly arranged at two intervals along the second direction, and the second direction joining part row is the interval between the third joining parts in the second direction The interval of the larger part is preferably 2 times or more, more preferably 2.5 times or more, more preferably 5 times or less, especially 4 times the interval between the third joining parts of the narrower part. Less than times.

<38>

The absorbent article of any one of the above <1> to <37>, wherein the composite sheet is in either of the central area and the side area, and the surface of the second sheet side is approximately It is flat and has large undulations on the side of the first sheet.

<39>

The absorbent article of any one of the above <1> to <38>, wherein any one of the central first convex portion and the central second convex portion formed with a plurality of central continuous convex portions formed in the central region All are, and the shape in plan view is roughly circular.

<40>

The absorbent article according to any one of the above <1> to <39>, wherein the central area of the composite sheet is alternately formed in the first direction: non-embossed areas extending in the second direction , And continuous in the second direction without joining parts; and embossed areas, which extend along the second direction and are formed with the joining parts in a regular pattern.

<41>

The absorbent article as in the above item <1>, which includes an absorbent body with an absorbent core containing an absorbent material, and a front sheet arranged on the skin facing side of the absorbent body, and has the equivalent of a wearer An absorbent article in the longitudinal direction of the front and rear directions and the transverse direction orthogonal thereto; and the above-mentioned absorbent body has: a core low-rigidity region which is located in the transverse central part of the above-mentioned absorbent core and extends in the longitudinal direction; and a core high-rigidity region , It is located on both lateral sides of the core low-rigidity region and has higher rigidity than the core low-rigidity region; and the above-mentioned front sheet has: Extending in the longitudinal direction; and the high rigidity area of the front material, which is located on the lateral sides of the low rigidity area of the front material and the rigidity is higher than the low rigidity area of the front material; and the high rigidity area of the front material The high-rigidity region with the above-mentioned core body overlaps in a plan view.

<42>

The absorbent article of the above-mentioned <41>, wherein the basis weight of the low-rigidity region of the core is lower than that of the high-rigidity region of the core.

<43>

The absorbent article of the above-mentioned <41> or <42>, wherein the high-rigidity core region is the region of the absorbent core other than the low-rigidity core region, and surrounds the low-rigidity core region.

<44>

The absorbent article of the above item <42> or <43>, wherein a groove is formed on the skin-facing surface or the non-skin-facing surface of the low-rigidity area of the core body, and the basis weight of the forming part of the groove is lower than that of the core body The non-formed part of the groove in the low rigidity area.

<45>

The absorbent article of the above-mentioned <44>, which has a ventral part arranged on the ventral side of the wearer, a dorsal part arranged on the back side, and the lower part of the crotch between them in the longitudinal direction; and the above-mentioned core body The low-rigidity region is a region in which a plurality of linear grooves are formed in a lattice shape in a plan view, and extends from the abdomen side to the back side.

<46>

The absorbent article of the above-mentioned <44> or <45>, wherein the longitudinal length of the low-rigidity region of the core is shorter than that of the absorbent core, and one of the pairs of grooves located at the outermost side in the longitudinal direction is located longer than the absorbent core. The longitudinal front and rear ends are closer to the inner side of the longitudinal direction.

<47>

The absorbent article of any one of the above items <44> to <46>, wherein the lateral length of the low rigidity region of the core, that is, the length of the outermost pair of the grooves in the lateral direction, is lower than that of the core. The entire longitudinal length of the rigid area is fixed.

<48>

The absorbent article according to any one of the above <44> to <47>, wherein the low rigidity region of the core body has: a high basis weight portion, which has a relatively high basis weight and has a protruding surface toward the non-skin facing side A convex shape; and a low basis weight portion, which is adjacent to the high basis weight portion, has a relatively low basis weight and is recessed toward the opposite side of the skin; and the groove is formed on the formation position of the low basis weight portion The concave part of the non-skin facing side.

<49>

The absorbent article as in the above item <48>, wherein in the low rigidity region of the core, the non-skin facing surface has a concave-convex structure due to the presence of a plurality of the grooves. In contrast, the skin facing surface does not have the grooves. Is flat.

<50>

The absorbent article of the above item <48> or <49>, wherein in the low-rigidity region of the core, a plurality of linear grooves extend in the longitudinal direction, and a plurality of linear grooves also extend in the transverse direction. A plurality of linear grooves orthogonal to each other, and the core low rigidity area is divided into a plurality of small areas, and the small area is the high basis weight portion.

<51>

The absorbent article according to any one of the above-mentioned <48> to <50>, wherein each of the above-mentioned high basis weight parts is divided by the above-mentioned low basis weight part, and each is independent.

<52>

The absorbent article of any one of <48> to <51> above, wherein the ratio of the basis weight of the low basis weight portion to the basis weight of the high basis weight portion is set to the latter/the former, and preferably 20% or more, more preferably 30% or more, more preferably 80% or less, and still more preferably 70% or less.

<53>

The absorbent article according to any one of the above items <48> to <52>, wherein the basis weight of the low basis weight portion is preferably 100 g/m ² or more, more preferably 150 g/m ² or more, and more preferably It is 500 g/m ² or less, more preferably 400 g/m ² or less.

<54>

The absorbent article according to any one of the above items <48> to <53>, wherein the basis weight of the high basis weight portion is preferably 300 g/m ² or more, more preferably 350 g/m ² or more, and more preferably It is 900 g/m ² or less, more preferably 800 g/m ² or less.

<55>

The absorbent article of any one of <48> to <54> above, wherein the thickness of the high basis weight part is greater than the thickness of the low basis weight part, and the thickness of the low basis weight part is relative to the thickness of the high basis weight part The ratio is set to the latter/the former, and is preferably 30% or more, more preferably 40% or more, and more preferably 90% or less, and still more preferably 80% or less.

<56>

The absorbent article according to any one of the above items <48> to <55>, wherein the thickness of the low basis weight portion is preferably 1.5 mm or more, more preferably 2.5 mm or more, and more preferably 4.5 mm or less, More preferably, it is 4 mm or less.

<57>

Absorbent articles such as any one of <48> to <56> above, wherein The thickness of the high basis weight portion is preferably 2 mm or more, more preferably 3 mm or more, and more preferably 8 mm or less, and still more preferably 7 mm or less.

<58>

The absorbent article according to any one of <48> to <57>, wherein the thickness of the high-rigidity region of the core is approximately the same as the thickness of the high-basis-weight portion of the low-rigidity region of the core.

<59>

The absorbent article according to any one of <41> to <58>, wherein the flexural rigidity of the core low-rigidity region is preferably 3g or more, more preferably 4g or more, and more preferably 10g or less, and further Preferably it is 9 g or less.

<60>

The absorbent article according to any one of the above <41> to <59>, wherein the flexural rigidity of the high-rigidity region of the core body is preferably 5 g or more, more preferably 6 g or more, and more preferably 20 g or less, and further Preferably it is 15 g or less.

<61>

The absorbent article according to any one of the above <41> to <60>, wherein the difference in bending rigidity between the low-rigidity core region and the high-rigidity core region is 1 g or more.

<62>

The absorbent article according to any one of the above <44> to <61>, wherein the front sheet has a convex portion protruding toward the wearer's skin side and a concave portion existing on the periphery of the convex portion, and the front sheet The low-rigidity area is different from the high-rigidity area of the front material, and the formation pattern of the convex portion and/or the concave portion is different.

<63>

The absorbent article of the above item <62>, wherein the concave portion is a high-density portion that has been embossed, and the convex portion is a low-density portion that has not been embossed.

<64>

The absorbent article of the above-mentioned <62> or <63>, wherein in the high-rigidity region of the front surface material, the convex portion is formed in a scattered dot shape in a plan view, more specifically, a staggered shape.

<65>

The absorbent article according to any one of the above items <62> to <64>, wherein the low-rigidity region of the front material has a plurality of continuous protrusions in a shape in which the protrusions are connected in the transverse direction as the protrusions.

<66>

The absorbent article of the above-mentioned <65>, wherein the high-rigidity region of the front material does not have the continuous convex portion, and a plurality of the convex portions exist independently in the high-rigidity region of the front material.

<67>

The absorbent article of the above-mentioned <65> or <66>, wherein the continuous convex portion is hollow, and the hollow portion extends continuously across substantially the entire lateral length of the continuous convex portion.

<68>

The absorbent article according to any one of the above <65> to <67>, wherein the continuous convex portion is formed by alternately connecting two types of small convex portions with different heights in the lateral direction.

<69>

The absorbent article of the above-mentioned item <68>, wherein in the low-rigidity area of the front material, the convex portion rows formed by a plurality of the convex portions and the continuous convex portion are alternately and linearly arranged in the longitudinal direction, and 1 One of the convex portions and one of the aforementioned small convex portions are formed at the same position in the lateral direction.

<70>

The absorbent article according to any one of the above <65> to <69>, wherein the distance between the continuous protrusions is preferably 3 mm or more, more preferably 4 mm or more, more preferably 9 mm or less, and more preferably Below 8mm.

<71>

The absorbent article of any one of <62> to <70> above, wherein in the low-rigidity region of the front material, a plurality of the above-mentioned protrusions are intermittently formed in the longitudinal direction at a specific pitch P4, and the above-mentioned core In the low-rigidity region of the body, a plurality of the above-mentioned grooves are intermittently formed at a predetermined pitch P5 in the longitudinal direction. It is preferably 3 or more, more preferably 7 or less, and more preferably 6 or less.

<72>

The absorbent article of any one of <41> to <71> above, wherein the ratio of the flexural rigidity of the high-rigidity area of the front material to the flexural rigidity of the low-rigidity area of the front material is set to the latter/the former, which is more Preferably it is 1.1 or more, More preferably, it is 1.2 or more.

<73>

The absorbent article of any one of <41> to <72> above, wherein the flexural rigidity of the high-rigidity area of the front material is greater than that of the low-rigidity area of the front material As a prerequisite, the bending rigidity is preferably 10 cN or more, more preferably 15 cN or more, and more preferably 50 cN or less, and still more preferably 40 cN or less.

<74>

The absorbent article according to any one of <41> to <73>, wherein the flexural rigidity of the low-rigidity area of the front material is based on the premise that the flexural rigidity of the front material is less than the high-rigidity area of the front material, and is preferably 40 cN or less, It is more preferably 30 cN or less, more preferably 5 cN or more, and still more preferably 10 cN or more.

<75>

The absorbent article of any one of the above items <41> to <74>, wherein the area of the skin facing surface of the low rigidity region of the core occupies the entire area of the skin facing surface of the absorbent core The ratio is preferably 20% or more, more preferably 30% or more, and more preferably 70% or less, and still more preferably 60% or less.

<76>

The absorbent article of any one of <41> to <75> above, wherein in a plan view, the boundary between the low-rigidity region of the core and the high-rigidity region of the core overlaps the low-rigidity region of the front material and the front material The junction of high rigidity areas.

<77>

The absorbent article of any one of the above-mentioned <41> to <76>, which has a ventral part arranged on the ventral side of the wearer and a dorsal part arranged on the back of the wearer in the longitudinal direction, and between them The lower part of the crotch; and on the abdomen and back, the boundary between the low-rigidity region of the core and the high-rigidity region of the core is located more laterally than the boundary between the low-rigidity region of the front material and the high-rigidity region of the front material Outside; and In the lower part of the crotch, the boundary between the low-rigidity region of the core and the high-rigidity region of the core is located more laterally inward than the boundary between the low-rigidity region of the front material and the high-rigidity region of the front material.

<78>

The absorbent article of any one of the above items <41> to <77>, wherein the absorbent core system has a single-layer structure and is in the shape of an hourglass with a longitudinal center portion retracted to the inside in a plan view.

<79>

An absorbent article comprising an absorbent body with an absorbent core containing an absorbent material, and a front material arranged on the opposite side of the skin of the absorbent body, and having longitudinal and An absorbent article in a transverse direction orthogonal to the absorbent article; and the absorbent body has: a core low-rigidity region located in the transverse central portion of the absorbent core and extending in the longitudinal direction; and a core high-rigidity region located in the core The lateral sides of the low-rigidity region have higher rigidity than the core low-rigidity region; and the front material has: a low-rigidity region of the front material, which overlaps the low-rigidity region of the core in a plan view and extends in the longitudinal direction; and the front material The high rigidity area is located on both lateral sides of the low rigidity area of the front material and has higher rigidity than the low rigidity area of the front material; and the high rigidity area of the front material and the high rigidity area of the core overlap in a plan view.

[Industrial availability]

The absorbent article of the present invention (first invention) is excellent in both air permeability and liquid introduction.

According to the present invention (the second invention), it is possible to provide an absorbent article that has a good touch to the skin under the crotch, is excellent in wear, and is less likely to leak.

10‧‧‧Composite sheet

12‧‧‧Front sheet

13‧‧‧Back sheet

14‧‧‧Absorber

14a‧‧‧Absorbent core

14b‧‧‧Packing chip material

15‧‧‧Three-dimensional wrinkle forming sheet

15a‧‧‧Elastic member

16‧‧‧Leg elastic member

100‧‧‧Disposable diapers

Ya‧‧‧Item width direction

Claims (48)

An absorbent article comprising a front sheet comprising a composite sheet, a back sheet, and an absorbent body arranged between the two sheets; and the composite sheet has a first sheet along the length of the article Direction and the second direction along the width direction of the article, and the laminated first sheet and second sheet are partially joined to form a plurality of joints. The first sheet is located away from the 2. The direction of the sheet is protruding, and convex portions protruding toward the wearer's skin are formed; and the composite sheet has a central area where the convex portions are formed in different patterns and two sides of the central area A pair of side regions; and the height of the convex portion with the largest height in the central region, that is, the first convex portion in the center, is higher than the convex portion with the largest height in the side region, that is, the first side convex portion; and the central region The amount of compression deformation is greater than the amount of compression deformation of the side region; by making the long sides coincide with the first direction and spaced apart along the second direction to form a row of rectangular first joints, formed along the second The first joint row of the direction. An absorbent article comprising a front sheet comprising a composite sheet, a back sheet, and an absorbent body arranged between the two sheets; and the composite sheet has a first sheet along the length of the article Direction and the second direction along the width direction of the article, and the laminated first sheet and second sheet are partially joined to form a plurality of joints. The first sheet is located away from the 2 The direction of the sheet is protruding, and convex portions protruding toward the wearer's skin side are formed; and the composite sheet has a central area in which the convex portions are formed in different patterns, and A pair of side regions located on both sides of the central region; and the height of the convex portion with the largest height in the central region, that is, the first central convex portion, is higher than the height of the convex portion with the largest height in the side region, that is, the first side portion 1 convex portion; and the compression deformation amount of the central region is greater than the compression deformation amount of the side region; in the side region of the composite sheet, a plurality of rows are formed in the first direction at two intervals along the second direction The second direction joint part rows of the third joint part are regularly arranged. The absorbent article of claim 1 or 2, wherein a plurality of rows of central continuous convex portions including the central first convex portion are formed in the central area, and the side portions are formed in scattered dots. Convex. The absorbent article of claim 1 or 2, wherein a plurality of rows of central continuous protrusions are formed in the central area; and the central continuous protrusions, the central first protrusion and the height lower than the central first protrusion The central second convex portions are alternately connected, or only a plurality of the central first convex portions are connected. The absorbent article of claim 3, wherein the central continuous convex portions extend in the second direction respectively; and the first lateral convex portion in the side region is equivalent to the composite sheet in the side region, Assuming that there are a plurality of parallel first imaginary straight lines and a plurality of parallel second imaginary straight lines that have an angle with the first imaginary straight line, they are located at each intersection of the above-mentioned first imaginary straight line and the above-mentioned second imaginary straight line . The absorbent article of claim 1 or 2, wherein in the central region, a central third convex portion having a height lower than that of the central first convex portion is formed; and an arrangement position of the central third convex portion in the first direction The first convex portions are located between each other in the center, and their height is equal to the height of the first convex portions of the side portions. The absorbent article of claim 1 or 2, wherein in the central area, a central third convex portion is formed with a height lower than the central first convex portion; and the central third convex portion is formed along the second direction Plurally, a longitudinally long joint part of a shape elongated in the first direction is formed between the center third convex parts adjacent in the second direction. The absorbent article according to claim 1 or 2, wherein the height of the first convex portion in the center is 105% or more and 200% or less with respect to the height of the first convex portion of the side portion. The absorbent article of claim 1 or 2, wherein the height of the central first convex portion is 0.5 mm or more and 5 mm or less. The absorbent article of claim 1 or 2, wherein the height of the first convex portion of the side portion is 0.3 mm or more and 4 mm or less. Such as the absorbent article of claim 1 or 2, where The difference between the height of the center first convex portion and the height of the side first convex portion is 0.1 mm or more and 2 mm or less. The absorbent article of claim 1 or 2, wherein a plurality of rows of central continuous convex portions are formed in the central region; and the central first convex portion constituting the central continuous convex portion and the height thereof are lower than the central first convex portion The central second convex portion has a cavity on the back side of the central first convex portion. The absorbent article of claim 1 or 2, wherein a plurality of rows of central continuous convex portions are formed in the central region; and the central first convex portion constituting the central continuous convex portion and the height lower than the central first convex There is a cavity on the back side of each of the central second convex portion, and the cavity on the back of the central first convex portion is continuous with the cavity on the back of the central second convex portion on the back of the central continuous convex portion. A continuous hollow portion continuously extending in the second direction is formed on the side. The absorbent article of claim 1 or 2, wherein one of the two orthogonal sides is aligned with the second direction, the other side is aligned with the first direction, and the second direction is spaced apart. A row of second joints is formed with a row of second joints along the second direction. Such as the absorbent article of claim 1 or 2, wherein the first joint part in a rectangular shape is arranged in a row by making its long side coincide with the first direction and spaced apart along the second direction, and is formed along the second The first joint row of the direction; and By making one of the two sides orthogonal to each other coincide with the second direction, the other side coincides with the first direction, and are arranged in a row along the second direction at intervals, the second joint portion is formed along the second direction. And in each row of the first joint, the arrangement interval of the first joint in the second direction is fixed, and in each row of the second joint, the first joint in the second direction There are two types of intervals for the arrangement interval of the two joints, and there are alternately wider intervals and narrower intervals. Such as the absorbent article of claim 1 or 2, wherein the first joint part in a rectangular shape is arranged in a row by making its long side coincide with the first direction and spaced apart along the second direction, and is formed along the second The first joining part row in the direction; and by making one of the two sides orthogonal to each other coincide with the second direction, the other side coincides with the first direction, and spaced apart along the second direction to arrange the first in a row 2 junctions, a second junction row along the second direction is formed; and in each of the first junction rows, the arrangement positions of the first junctions when viewed in the second direction are all the same. Regarding each of the first junctions The 2 rows of joints also mean that the arrangement positions of the above-mentioned second joints when viewed in the second direction are all the same. Such as the absorbent article of claim 1 or 2, wherein the first joint part in a rectangular shape is arranged in a row by making its long side coincide with the first direction and spaced apart along the second direction, and is formed along the second The first joining part row in the direction; and by making one of the two sides orthogonal to each other coincide with the second direction, the other side coincides with the first direction, and spaced apart along the second direction to arrange the first in a row 2 Joints, formed with a row of second joints along the second direction; and Focusing on one of the first joints constituting the row of the first joints, a total of four of the rows of the second joints constituting the two rows of the second joints are arranged around the first joints and are arranged close to each other The corners of each are opposed to the four corners of the first joint. Such as the absorbent article of claim 1 or 2, wherein the first joint part in a rectangular shape is arranged in a row by making its long side coincide with the first direction and spaced apart along the second direction, and is formed along the second The first joining part row in the direction; and by making one of the two sides orthogonal to each other coincide with the second direction, the other side coincides with the first direction, and spaced apart along the second direction to arrange the first in a row 2 joints, formed with a row of second joints along the second direction; and formed with a joint group consisting of a first joint and 4 second joints located around it, and in each In the embossing area, a plurality of the same joining part groups are formed at regular intervals along the second direction. The absorbent article of claim 1 or 2, wherein the central region of the composite sheet is formed with the central first convex portion on the first sheet constituting the composite sheet, and the height is lower than the center of the central first convex portion The second convex portion, the central third convex portion, and the fourth convex portion; and if you also focus on the central second convex portion, the central third convex portion, and the fourth convex portion that are lower in height than the central first convex portion , The three types of convex portions are arranged regularly and linearly along the first direction in the order of the central second convex portion, the fourth convex portion, the central third convex portion, and the fourth convex portion. Such as the absorbent article of claim 1 or 2, where The central region of the composite sheet is formed with the central first convex portion, the central second convex portion, the central third convex portion, and the first central convex portion having a height lower than the central first convex portion on the first sheet constituting it. 4 convex portions, and the height of the fourth convex portion is lower than any one of the central first convex portion, the central second convex portion, and the central third convex portion. An absorbent article according to claim 2, wherein the row of the second direction joints has a first interval and a second interval wider than the first interval as the interval between the third joints in the second direction, and The plurality of third joints in the row of joints in the second direction are intermittently arranged in the second direction so as to alternately have these two types of intervals in the second direction. Such as the absorbent article of claim 2, wherein a plurality of said third joints constituting each row of said second direction joints have the same length and arrangement position in the first direction, and said first joints adjacent to each other in the first direction A gap of a fixed width is formed between the rows of the two-direction joints. The absorbent article of claim 2, wherein the rows of the second direction joints formed in the first direction are every other row, and the arrangement positions of the third joints in the second direction are the same and adjacent to each other The rows of the second-direction joint portions are different from each other in the arrangement positions of the third joint portions in the second direction. The absorbent article of claim 2, wherein as the above-mentioned second direction joint portion row, the second direction is alternately formed in the first direction The arrangement position of the third joining portion is different from the first joining portion row in the second direction and the second joining portion row in the second direction. Regarding the arrangement position of the third joining portion in the second direction, the first joining portion in the second direction The row of joints and the row of the second joint in the second direction are one pair of the other joint row adjacent to each other at a first interval. Between the third joints. The absorbent article of claim 1 or 2, wherein the composite sheet in the side region is assumed to have a plurality of first imaginary straight lines that are parallel to each other, and a mutual angle between the first imaginary straight line and the first imaginary straight line. In the case of a plurality of parallel second imaginary straight lines, the angle θ formed by the first imaginary straight line and the second imaginary straight line is 30° or more and 165° or less. The absorbent article of claim 1 or 2, wherein the composite sheet in the side region is assumed to have a plurality of first imaginary straight lines that are parallel to each other, and a mutual angle between the first imaginary straight line and the first imaginary straight line. In the case of a plurality of parallel second imaginary straight lines, in the side region of the composite sheet, there are formed a plurality of third-direction convex portions rows, which are the plural first side convex portions at fixed intervals It is formed by tandem along the first imaginary straight line; and a plurality of rows of convex portions in the fourth direction, which are formed by arranging a plurality of the first convex portions of the side portion in series along the second imaginary straight line at a fixed interval. Such as the absorbent article of claim 26, where Between adjacent rows of protrusions in the third direction, a plurality of pairs of joints are formed in series with a fixed interval between the rows of third-direction joints, between adjacent rows of fourth-direction protrusions. , A fourth-direction junction row formed by a plurality of junction pairs arranged in series at a fixed interval is formed. The absorbent article according to claim 1 or 2, wherein micro-protrusions are formed in the side region; and the height of the micro-protrusions is less than 1/3 of the first protrusion of the side. For example, the absorbent article of claim 1 or 2, which has a ventral portion arranged on the wearer's ventral side when worn, a dorsal portion arranged on the wearer's dorsal side when worn, and a dorsal portion located on the ventral side and Disposable diapers at the lower part of the crotch between the back side parts; and at least the widthwise central part of the back side part, spaced apart in the longitudinal direction of the disposable diaper, a plurality of pieces are arranged so that the disposable diaper is in the width A plurality of elastic members contracted in the direction; and in the elastic member arrangement area where the plurality of elastic members are arranged, the central area of the composite sheet is arranged, and the elastic member arrangement area is respectively formed by extending in the second direction There are a plurality of rows including the central continuous convex portion composed of the first central convex portion; and the width of the central continuous convex portion is set to P1, the interval between the elastic members is set to P2, and the center of the central continuous convex portion When the interval between the parts is set to P3, the relationship of P1<P2<P3 is satisfied. The absorbent article of claim 1 or 2, wherein a plurality of rows of central continuous convex portions are formed in the aforementioned central area; and Between the aforementioned central continuous convex portions adjacent to each other in the first direction, longitudinal joint portions having a shape elongated in the first direction are formed at equal intervals in the second direction. The absorbent article of claim 30, wherein the length of the first joint as the longitudinal joint in the first direction is 1.2 times or more and 5 times the length in the second direction. The absorbent article according to claim 30, wherein the length of the first joint as the longitudinal joint in the first direction is 1.2 times or more and 5 times the length of the second joint in the first direction. The absorbent article of claim 30, wherein the length in the first direction of the first joint as the longitudinal joint is 0.5 mm or more and 10 mm or less. Such as the absorbent article of claim 1 or 2, wherein one of the two sides orthogonal to each other is aligned with the second direction, the other side is aligned with the first direction, and is arranged in a row with an interval in the second direction The length of the second joining portion along the first direction is 0.1 mm or more and 5 mm or less, and the length along the second direction is 0.1 mm or more and 5 mm or less. The absorbent article of claim 1 or 2, wherein the third joining portion formed in the side region of the composite sheet has a length in the first direction of 0.1 mm or more and 5 mm or less, and the length in the second direction is 0.1mm or more and 5mm or less Down. Such as the absorbent article of claim 35, wherein the second direction joint part row in which the third joint part is regularly arranged at two intervals along the second direction is the interval between the third joint part in the second direction. The interval of the large part is 2 times or more and 5 times or less with respect to the interval between the third joining parts of the narrow part. The absorbent article of claim 1 or 2, wherein the composite sheet is substantially flat on the side of the second sheet in any of the central region and the side region, and is on the first sheet Large undulations are formed on the side of the material. The absorbent article of claim 1 or 2, wherein any one of the central first convex portion and the central second convex portion formed with a plurality of central continuous convex portions formed in the central region has a shape in a plan view. Roughly round shape. The absorbent article of claim 1 or 2, wherein the central area of the composite sheet is alternately formed in the first direction with non-embossed areas extending in the second direction and in the second direction It is continuous without a joint; and an embossed area, which extends in the second direction and is formed with the joint in a regular pattern. An absorbent article according to claim 1 or 2, which includes the above-mentioned absorbent body provided with an absorbent core containing an absorbent material, and the above-mentioned front sheet disposed on the skin facing side of the absorbent body, and has equivalent In front of and behind the author Absorbent articles in the longitudinal direction and the transverse direction orthogonal thereto; and the absorbent body has: a core low rigidity area located in the transverse central portion of the absorbent core and extending in the longitudinal direction; and a core high rigidity area located in the The lateral sides of the core low-rigidity region have higher rigidity than the core low-rigidity region; and the front sheet has: a frontal low-rigidity region that overlaps the core low-rigidity region and extends in the longitudinal direction in a plan view; And the front material high rigidity area, which is located on both lateral sides of the front material low rigidity area and has higher rigidity than the front material low rigidity area; and the front material high rigidity area and the core high rigidity area overlap in a plan view. The absorbent article according to claim 40, wherein the basis weight of the low-rigidity region of the core is lower than that of the high-rigidity region of the core. The absorbent article according to claim 41, wherein a groove is formed on the skin-facing surface or the non-skin-facing surface of the low-rigidity region of the core body, and the basis weight of the forming part of the groove is lower than that in the low-rigidity region of the core body The non-formed part of the groove. The absorbent article according to claim 42, wherein the front sheet has a convex portion protruding toward the wearer's skin side and a concave portion existing around the convex portion, and is located in the low rigidity area of the front material and the high rigidity of the front material Regions, the formation patterns of the protrusions and/or the recesses are different. The absorbent article of claim 43, wherein the low-rigidity region of the front material has a continuous shape in which a plurality of convex portions are connected in the transverse direction The convex portion serves as the above-mentioned convex portion. An absorbent article according to claim 43, wherein a plurality of the convex portions are intermittently formed in the low-rigidity region of the front material at a predetermined pitch P1 in the longitudinal direction, and in the low-rigidity region of the core body, a plurality of the protrusions are intermittently formed in the longitudinal direction. A plurality of the above-mentioned grooves are intermittently formed in the pitch P2, and the ratio of the pitch P2 to the pitch P1 is set as the pitch P2/pitch P1, which is 2 or more and 7 or less. The absorbent article according to claim 40, wherein the area of the skin-facing surface of the low-rigidity region of the core occupies more than 20% of the entire area of the skin-facing surface of the absorbent core. The absorbent article according to claim 40, wherein the boundary between the low-rigidity region of the core and the high-rigidity region of the core overlaps the boundary between the low-rigidity region of the front material and the high-rigidity region of the front material. Such as the absorbent article of claim 40, which has a ventral part arranged on the ventral side of the wearer, a dorsal part arranged on the back side, and the lower part of the crotch between them in the longitudinal direction; and on the aforementioned ventral side The boundary between the low-rigidity region of the core and the high-rigidity region of the core is located on the laterally outer side of the boundary between the low-rigidity region of the front material and the high-rigidity region of the front material; and at the lower part of the crotch, The boundary between the low-rigidity region of the core and the high-rigidity region of the core is located more laterally inward than the boundary between the low-rigidity region of the front material and the high-rigidity region of the front material.

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