JP2008136667A - Absorbent article - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an absorbent article capable of improving a side leakage prevention property from planar expansion/contraction parts of side cuffs and a skin in the absorbent article with the side cuffs. <P>SOLUTION: This absorbent article has an absorbent body and the side cuffs 35; each side cuff 35 has a side cuff formation sheet 37, side-cuff longitudinal elastic members 36 and side-cuff width-directional elastic members 38; from a composite expansion/contraction part formed of facing sheets 37 and 45 and the elastic members 38 therebetween, the side cuff 35 is formed with a planar composite expansion/contraction part 4 expanding/contracting in the width direction near its free end; the composite expansion/contraction part 4 is so formed that the facing sheets 37 and 45 are mutually joined by joint parts intermittent in the expansion/contraction direction of the composite expansion/contraction part 4 and in the direction orthogonal thereto; the elastic members 38 are disposed not to pass through the joint parts and non-fixed to the sheets 37 and 45 at parts excluding the both ends of the elastic member 38, and the sheets 37 and 45 are formed into a plurality of folds 43 continuously extending across the plurality of elastic members 38 respectively. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to absorbent articles such as disposable diapers and sanitary napkins.

Conventionally, in a disposable diaper having an absorbent main body including an absorbent core, in order to prevent side leakage from the absorbent main body, it is arranged along both sides of the absorbent main body and stands on the skin contact surface side. There are known side cuffs (also called “side solid gathers” etc.). The standing property of the side cuff is expressed by the contraction force of the elastic member fixed to the upper part along the longitudinal direction. Moreover, it is preferable that the upper part of a side cuff is planar so that it may contact | abut with a wearer's skin planarly. In the following description, a planar upper portion of a side cuff that exhibits elasticity by an elastic member is also referred to as a “planar stretchable portion”.
Since the planar stretchable part is a part that comes into contact with the skin of the wearer, it is desired that the planar stretchable part has a soft touch and is excellent in air permeability and cushioning properties.

  The applicant of the present application previously described, as a means for realizing a side cuff having a planar stretchable portion that is soft to the touch and excellent in breathability and cushioning properties, “two sheet materials and a space between these two sheet materials. A composite stretchable member having a stretchable portion composed of a plurality of elastic members arranged, wherein the two sheet materials are intermittently joined to each other in a stretchable direction of the stretchable portion and a direction perpendicular thereto. The elastic member is disposed in the stretchable portion so as not to pass through the joint portion between the two sheet materials, and is fixed to the two sheet materials at both ends thereof, and each of the two sheet materials includes a plurality of each. Use of a composite stretchable member forming a plurality of ridges extending continuously over the elastic member of the book as a planar stretchable portion (skin contact surface) of a side cuff (leakage barrier) It has been proposed (see Patent Document 1 below).

JP 2005-80859 A

  By the way, in the side cuff provided with a planar stretchable part, the followability of the planar stretchable part to the wearer's skin is improved, and the lateral leakage prevention property between the planar stretchable part and the wearer's skin is improved. Further improvement is desired. This also applies to absorbent articles other than disposable diapers, such as sanitary napkins.

  Therefore, an object of the present invention is an absorbent article comprising an absorbent main body including an absorbent core, and side cuffs that are arranged along both sides of the absorbent main body and stand on the skin contact surface side. An object of the present invention is to provide an absorbent article that can further improve the ability to prevent side leakage from between the planar elastic part of the side cuff and the skin of the wearer.

  The present invention is an absorbent article comprising an absorbent main body including an absorbent core, and side cuffs arranged along both side portions of the absorbent main body and standing on the skin contact surface side. The cuff includes a side cuff forming sheet, a side cuff longitudinal elastic member fixed along the longitudinal direction of the absorbent main body to the side cuff forming sheet in the vicinity of the free end of the side cuff, and the free end of the side cuff. Side cuff width direction elastic members arranged along the width direction of the absorbent main body in the vicinity, a composite stretchable part forming sheet facing each other, and a plurality of side cuff widths disposed between both facing sheets From the elastic member forming the composite elastic part formed of the directional elastic member, a planar composite elastic part extending and contracting in the width direction of the absorbent main body is formed in the vicinity of the free end of the side cuff, and the composite elastic part faces each other. Composite stretchable part forming sheet stretches the composite stretchable part In addition, the elastic members forming the composite stretchable parts are arranged so as not to pass through the joints in the direction orthogonal to the joints, and the composites are formed in the parts excluding both ends of the elastic parts forming the composite stretchable parts. Each of the facing composite stretchable part forming sheets that are not fixed to the stretchable part forming sheet is formed by forming a plurality of ridges that continuously extend across a plurality of composite stretchable part forming elastic members. The object is achieved by providing an absorbent article.

  According to the absorbent article of the present invention, an absorbent article comprising an absorbent main body including an absorbent core, and side cuffs arranged along both side portions of the absorbent main body and standing on the skin contact surface side. In this case, it is possible to further improve the side leakage preventing property from between the planar stretchable portion of the side cuff and the skin of the wearer. In particular, when applied to a disposable diaper, the side leakage prevention property of soft stool from between the planar elastic part of the side cuff and the wearer's skin is improved.

Hereinafter, the absorbent article of the present invention will be described based on a first embodiment which is a preferred embodiment thereof with reference to the drawings. In the following description of the embodiment, when referring to “disposable diapers” or “diapers”, they are substantially synonymous with the “absorbent article” of the present invention.
1st Embodiment applies the absorptive article of the present invention to underpants type disposable diaper 1, and as shown in Drawing 1-Drawing 4, absorptive main part 3 containing absorptive core 34, and absorptive main part 3 Side cuffs 35 that are arranged along both sides of the skin and stand on the skin contact surface side. The pants-type disposable diaper according to the present embodiment further includes an outer packaging material 2 joined to the non-skin contact surface side of the absorbent main body 3, and the outer packaging material 2 is abdominal side A, crotch C and back side in the longitudinal direction. The side edges of the ventral side A and the back side B of the outer packaging material 2 are joined to each other, and a pair of side seal parts 11, a waist opening part 12, and a pair of leg opening parts 13 are formed. It is a formed pants-type disposable diaper.

  The outer packaging material 2 is formed of an outer layer sheet 21, an inner layer sheet 22, and a plurality of outer packaging material forming elastic members 23, 24, 25, and 26 disposed between the sheets 21, 22. The outer packaging material 2 The waist part D and the waist part F in the abdomen side part A and the back part B are provided with a waist part gather G1 and a waist gather G2 formed from the composite stretchable part 4 (see FIG. 17), respectively.

  More specifically, the disposable diaper 1 of the present embodiment includes a liquid-permeable top sheet 32, a liquid-impermeable or water-repellent back sheet 33, and both sheets 32, 33 as shown in FIGS. A substantially vertically long absorbent main body 3 having a liquid-retaining absorbent core 34 disposed therebetween, and an outer packaging material 2 joined to the back sheet 33 side (non-skin contact surface side) of the absorbent main body 3 It has. The absorbent main body 3 is disposed across the ventral side A to the back side B of the outer packaging material 2, but the longitudinal end of the absorbent main body 3 is more than the longitudinal end of the outer packaging 2. Retreats inward in the longitudinal direction. The absorptive main body 3 is joined to the inner layer sheet 22 of the outer packaging material 2 by a main body joining portion 15 by a heat fusion method such as heat sealing or ultrasonic sealing, an adhesive material or an adhesive bonding method, or the like.

  The outer wrapping material 2 has an hourglass shape in which both side edges are bound inward in the central portion in the longitudinal direction, and defines the outline of the diaper. The outer packaging material 2 is divided in the longitudinal direction into an abdominal side A disposed on the abdomen side of the wearer, a back side B disposed on the back side, and a crotch C positioned therebetween. The ventral side A and the back side B correspond to the longitudinal front and rear portions of the outer packaging material 2, respectively, and the crotch portion C corresponds to the longitudinal central portion of the outer packaging material 2. As for the outer packaging material 2, the both-sides edge part of the ventral | abdominal side part A and the both-sides edge part of the back side part B are mutually joined, and the waist opening part 12 and a pair of leg opening part 13 are formed in the disposable diaper 1. . By this joining, a pair of side seal parts 11 and 11 are formed on the left and right side edges of the disposable diaper 1 to form a pant-type. For this joining, heat sealing, high frequency sealing, ultrasonic sealing or the like is used.

  The top sheet 32, the back sheet 33, and the absorbent core 34 are each rectangular, and are integrated to form the vertically long absorbent main body 3. As the surface sheet 32, the back surface sheet 33, and the absorptive core 34, the thing similar to what was conventionally used for this kind of diaper can be used, respectively. For example, the absorbent core 34 may be made of absorbent polymer particles and a fiber material and covered with tissue paper (not shown).

  As shown in FIG. 5, the absorbent core 34 in the present embodiment includes an hourglass-shaped central absorbent body 34 </ b> A and a pair of side absorbent bodies 34 </ b> B and 34 </ b> B provided symmetrically on both sides of the central absorbent body 34 </ b> A. It has. The central absorbent body 34A and the pair of side absorbent bodies 34B and 34B are separated at least in the central part in the longitudinal direction. One side in the longitudinal direction and the other side in the longitudinal direction of the side absorbent body 34B are connected to each other at one side in the longitudinal direction and the other side in the longitudinal direction of the central absorbent body 34A, respectively. Therefore, the cut-out portions 34C and 34C are formed between the central absorbent body 34A and the pair of side absorbent bodies 34B and 34B, respectively.

The one part in the longitudinal direction, the central part in the longitudinal direction, and the other part in the longitudinal direction are each region when the absorbent core 34 is divided into three regions so as to be divided into approximately three equal parts in the longitudinal direction.
When the absorbent core 34 has the separation portion 34 </ b> C, both side edges of the absorbent core 34 easily stand up. Further, when the absorbent core 34 is pressed in the width direction, the entire width of the absorbent core 34 is narrowed, so that the shrinkage in the width direction of the outer packaging material 2 is difficult to be inhibited.

  The shape of the absorbent core 34 in plan view is not limited to the shape shown in FIG. 5. For example, the side absorbent body 34 </ b> B is connected to the central absorbent body 34 </ b> A only in one of the longitudinal direction one part or the longitudinal direction other part. May be a shape in which the side absorber 34B is not connected (separated) to the central absorber 34A, or a shape that does not have the separation portion 34C (none of which is shown).

Side cuffs 35, 35 are provided on both sides along the longitudinal direction of the absorbent main body 3, as shown in FIGS. 2 to 4. The side cuffs 35 are arranged along both side portions of the absorbent main body 3 and stand on the skin contact surface side.
As shown in FIGS. 4 and 6, the side cuff 35 includes a side cuff forming sheet 37 joined to the absorbent main body 3, and the side cuff forming sheet 37 near the free end of the side cuff 35. The side cuff longitudinal direction elastic member 36 fixed along the longitudinal direction 3 and the side cuff width direction elastic member 38 disposed along the width direction of the absorbent main body 3 in the vicinity of the free end of the side cuff 35. It has. 2 to 4, the side cuff width direction elastic member 38 is not shown.

The side cuff forming sheet 37 is preferably made of a liquid resistant or water repellent and breathable nonwoven fabric. Examples of such a nonwoven fabric include an air-through nonwoven fabric, a heat roll nonwoven fabric, a spunlace nonwoven fabric, a spunbond nonwoven fabric, and a meltblown nonwoven fabric. As shown in FIGS. 3 and 4, the side cuff forming sheet 37 has a predetermined width portion 37 </ b> A wound down to the non-skin contact surface side of the back sheet 33 in the diaper state, It is fixed between the inner layer sheet 22 of the material 2.
The cross-sectional shape of the side cuff forming sheet 37 will be described in more detail. As shown in FIGS. 4 and 6, the inner side of the side cuff forming sheet 37 is formed between the back sheet 33 and the inner layer sheet 22 of the outer packaging material 2. It stands up from between, and its inner edge is located in the vicinity of the inner edge of the composite elastic part 4 (details will be described later) which is a planar elastic part. The outer side of the side cuff forming sheet 37 rises between the back sheet 33 and the inner layer sheet 22 of the outer packaging material 2, passes through the vicinity of the inner edge of the composite stretchable part 4, and goes to the outer edge of the composite stretchable part 4. It extends over and is folded back further.
That is, the standing wall portion of the side cuff 35 is formed from the side cuff forming sheet 37 having a double structure.

As shown in FIG. 6, the side cuff longitudinal elastic members 36 are arranged in an extended state in the vicinity of both side portions of the composite stretchable portion 4 that is a planar stretchable portion of the side cuff 35 (that is, two). Yes.
As shown in FIG. 6, of the two lateral cuff longitudinal elastic members 36, the lateral cuff longitudinal elastic member 36 in the width direction is sandwiched between the side cuff forming sheets 37 having a double structure. And bonded by an adhesive 35B. The lateral cuff longitudinal direction elastic member 36 at the outer side in the width direction is sandwiched between the outer portions of the side cuff forming sheet 37 folded back and joined by an adhesive 35B.
Since the lateral cuff longitudinal elastic member 36 is provided on the lateral cuff 35, when the disposable diaper 1 is worn, the lateral cuff longitudinal elastic member 36 contracts to cause the lateral cuff 35 to stand up. The liquid outflow in the width direction of the absorbent main body 3 is prevented.

  As shown in FIG. 6, the side cuff width direction elastic member 38 is disposed in the vicinity of the free end of the side cuff 35 along the width direction of the absorbent main body 3. The number of the side cuff width direction elastic members 38 is, for example, 5 to 30. The side cuff width direction elastic member 38 is sandwiched between the outer side of the side cuff forming sheet 37 and another composite stretchable part upper surface forming sheet 45 along the width direction of the absorbent main body 3. Both ends of the side cuff width direction elastic member 38 are joined by the adhesive 35A, but portions other than the both ends of the side cuff width direction elastic member 38 are not joined by the adhesive 35A.

As described above, the side cuff 35 is disposed between the side cuff forming sheet 37 and the facing composite stretchable part forming sheet composed of the composite stretchable part upper surface forming sheet 45 different from the side cuff forming sheet 37 and both the sheets 37 and 45. Further, a planar composite stretchable part 4 that stretches in the width direction of the absorbent main body 3 from the composite stretchable part forming elastic member 42 including a plurality of lateral cuff widthwise elastic members 38 in the vicinity of the free end of the side cuff 35. Is formed. The composite stretchable part 4 is preferably 50%, more preferably 80% or more, and most preferably 100% (that is, over the full length) of the total length of the planar stretchable part of the side cuff 35.
The details of the composite stretchable part 4 in the side cuff 35 will be described after describing the composite stretchable part 4 forming the waistline gather G1 and the waist gather G2.

  As shown in FIGS. 2, 3, and 7, the outer packaging material 2 includes an outer layer sheet 21, an inner layer sheet 22, and a plurality of outer packaging material forming elastic members 23, 24, 25 disposed between the sheets 21, 22. , 26. 7 is a developed plan view of the outer packaging material 2 viewed from the inner surface side of the outer layer sheet 21 in a state where the inner layer sheet 22 is virtually removed. The outer layer sheet 21 forms the outer surface of the diaper, and the inner layer sheet 22 is disposed on the inner surface side of the outer layer sheet 21.

  In the disposable diaper 1 of the present embodiment, as shown in FIGS. 2, 3, and 7, the outer layer sheet 21 is more than the portion where the waist elastic members 24 and 24 are sandwiched and fixed by the outer layer sheet 21 and the inner layer sheet 22. Furthermore, the extension area | regions 21B and 21B which have the length extended and are extended rather than the inner layer sheet | seat 22 in the outer layer sheet | seat 21 are return | folded by the absorptive main body 3 side. The area other than the extension area 21B in the outer layer sheet 21 is referred to as a non-extension area 21A. The inner layer sheet 22 has the same shape as the non-extending region 21 </ b> A of the outer layer sheet 21.

The skin contact surface side at both longitudinal ends of the absorbent main body 3 is covered with the extended region 21 </ b> B of the folded outer layer sheet 21 together with the side cuffs 35. In the extension region 21B of the outer layer sheet 21, the portion overlapping the both ends in the longitudinal direction of the absorbent main body 3 is bonded through an adhesive (not shown) over substantially the entire width of the absorbent main body 3, Thus, both ends in the longitudinal direction of the absorbent main body 3 are fixed to the outer packaging material 2.
The skin contact surface side at both longitudinal ends of the absorbent main body 3 is covered with the extended region 21B of the folded outer layer sheet 21, so that both longitudinal ends of the absorbent main body 3 are in direct contact with the wearer. It is possible to prevent the leakage of the absorbent polymer of the absorbent core 34 from both longitudinal ends of the absorbent main body 3.

The inner surface of the outer layer sheet 21 (the surface facing the inner layer sheet 22) is coated with an adhesive Q such as a hot melt adhesive in the coating shape shown in FIG. As shown in FIG. 8, the adhesive Q includes almost the entire region corresponding to the side seal portion 11, the region corresponding to the non-functionalized region 51 (described later) of the waistline elastic member 23, and the leg elastic member cutting region 52 (described later). ) Is applied to the area corresponding to.
On the other hand, the adhesive Q is not applied to almost the entire region corresponding to the composite stretchable part 4 (details will be described later) and almost all the region corresponding to the crotch C.

On the surface of the inner layer sheet 22 facing the outer layer sheet 21, an adhesive Q such as a hot-melt adhesive is applied in the coating shape shown in FIG. As shown in FIG. 9, the adhesive Q is applied to almost the entire region other than the region corresponding to the composite stretchable portion 4.
On the other hand, the adhesive Q is not applied to almost the entire region corresponding to the composite stretchable portion 4, similarly to the inner surface of the outer layer sheet 21.

  Thus, the coating shape of the adhesive Q on the surface facing the outer layer sheet 21 in the inner layer sheet 22 includes the coating shape of the adhesive Q on the inner surface of the outer layer sheet 21. Therefore, when the outer layer sheet 21 and the inner layer sheet 22 are bonded together, the adhesive Q applied to the inner surface of the outer layer sheet 21 on the surface facing the outer layer sheet 21 is also disposed on the inner layer sheet 21, The adhesive Q is also applied to the inner surface of the outer layer sheet 21 in the coating shape of the inner layer sheet 22 facing the outer layer sheet 21.

  In the disposable diaper 1 of this embodiment, as shown in FIG.3 and FIG.4, between the outer-layer sheet | seat 21 and the inner-layer sheet | seat 22 in each of the ventral | abdominal part A and the back | dorsal part B, in the side seal part 11, They are joined to each other by a heat-sealing method such as a seal, a high-frequency seal, and an ultrasonic seal.

  Further, waist gathers G <b> 2 are provided in the waist portions F in the ventral side portion A and the back side portion B of the outer packaging material 2. The waist portion F refers to a region from the peripheral edge of the waist opening 12 to a position spaced 30 mm downward, for example, the position of the peripheral edge of the abdominal waist opening 12 and the waist opening 12 on the back side. In the case where the position of the peripheral edge is shifted (not shown), the range of the waist portion F is determined on the assumption that there is no shifted and extended region.

  The waist part F will be described in detail. A plurality of waist elastic members 24 are arranged along the peripheral edge of the waist opening 12 in the waist part F in each of the ventral part A and the back part B. A composite stretchable part 4 (details will be described later) is formed mainly of the outer layer sheet 21, the inner layer sheet 22 and the waist elastic member 24. The composite stretchable part 4 extends between the pair of side seal parts 11. A waist gather G2 is formed (over the entire circumference of the waist portion F).

  The outer packaging material 2 is provided with a leg gather G3 along a pair of leg openings 13. More specifically, a plurality of leg elastic members 25 are arranged along each peripheral edge of the leg opening 13 curved in the crotch part C. The leg elastic member 25 is fixed in an expanded state between the outer layer sheet 21 and the inner layer sheet 22 via the adhesive Q. Thereby, a leg gather G3 is formed along the leg opening 13.

  In the present embodiment, the leg elastic member 25 includes a member disposed over the half of the peripheral edge of the leg opening 13 near the ventral side A and the back side in relation to the manufacturing method described later. By combining with a member arranged over half of the part B, it is arranged so as to extend over the entire peripheral edge of the leg opening 13, but depending on the manufacturing method, the leg elastic member 25 is One can be disposed over the entire periphery of the leg opening 13.

  A waistline gather D1 formed of a composite stretchable part 4 (details will be described later) is provided on the waistline part D of the abdomen A and back side B of the outer packaging material 2. The waistline portion D is a region from the lower portion of the waist portion F to the upper end of the leg opening 13. The waistline portion D will be described in detail. The waistline portion D is provided with a plurality of waistline elastic members 23 along the width direction. The waistline elastic member 23 extends between the vicinity of the side edge of the absorbent main body 3 and the side seal portion 11, and is not disposed between the vicinity of the side edge of the absorbent main body 3.

And the composite elastic part 4 is formed mainly by the outer layer sheet 21, the inner layer sheet 22, and the waistline elastic member 23. By this composite elastic part 4, the vicinity of the side edge part of the absorbent main body 3 and the side seal part 11 are formed. A pair of waistline gathers G1 arranged in the width direction is formed in the width direction. The waistline gather G1 is not disposed between the side edge portions of the absorbent main body 3.
The term “in the vicinity of the side edge of the absorbent main body 3” means a region within 25 mm inward in the width direction and within 25 mm outward in the width direction from the side edge of the absorbent main body 3.

  The waistline portion D is further divided in the longitudinal direction into an upper waistline portion D1 and a lower waistline portion D2 below the upper waistline portion D1. The upper waistline portion D1 is preferably located in a region that abuts on a portion (hereinafter also referred to as “iliac region”) from the wearer's iliac crest to the upper anterior iliac spine when the diaper 1 is worn. The iliac crest and superior anterior iliac spine are anatomical terms. The iliac crest is a part indicated by reference sign Q1 in FIG. 10, and the superior anterior iliac spine is a part indicated by reference sign Q2 in FIG.

Conventionally, in order to prevent slipping off during wearing of a pants-type diaper, particularly when the diaper is for infants, the tightening pressure of the elastic member disposed on the waist portion is increased, and the waist portion It has been considered effective to bring the pants-type diaper into close contact with the wearer's body by tightening.
However, in order to effectively prevent slipping during wearing of pants-type diapers, the tightening pressure of the diaper corresponding to the wearer's iliac region is higher than the conventional tightening pressure of the waist. It has also been found that it is effective to increase it. The reason for this is that the wearer (especially infants) overhangs the abdomen as a physical feature, so if the tightening pressure of the waist that abuts the overhanging abdomen is increased, the tightening pressure is high, so the waist This is because the waist part is shifted down to the part where the part is gradually narrowed down and the abdomen becomes thinner.

FIG. 11 shows a state in which a baby's body is regarded as a cone. In the figure, θ represents an angle formed by a perpendicular to the tangent at the waist (point A) and a horizontal line toward the center of the body. F indicates the tightening force of the elastic member, P indicates the frictional force resulting from the tightening force F, f1 indicates the displacement force due to the tightening force F, and f2 indicates the vertical drag. Here, since f1 = Fsinθ and P = νN = νf2 = νFcosθ (ν represents a friction coefficient), the “slip-off force Z” directed downward at the point A is represented by the following equation.
Z = f1−P = Fsinθ−νFcosθ = F (sinθ−νcosθ)
From this equation, it can be understood that when the waist portion is in a state where slipping occurs, the slipping force increases as the tightening force F increases.

  A portion (iliac region) from the wearer's iliac crest to the upper anterior iliac spine has a certain width, and the upper waistline portion D1 of the diaper 1 is fixed to the iliac region within the range of the width. The diaper 1 can be effectively prevented from falling off. From this viewpoint, in the diaper 1 of the present embodiment, the width of the upper waistline portion D1 (that is, the length of the upper waistline portion D1 along the longitudinal direction of the diaper 1) is set to 12 to 35 mm. When this width is 20 to 35 mm, particularly 25 to 30 mm, the diaper 1 can be prevented from slipping off more effectively, and the appearance of the diaper 1 in the wearing state and the wearing operation of the diaper 1 (easy to wear) Etc.) can be further improved.

  In the state where the diaper 1 is worn, the size of the diaper 1 and the wearer are determined so that the upper waistline portion D1 abuts on a portion (iliac region) from the wearer's iliac crest to the upper anterior iliac spine. The relationship with the physique is important. For example, when considering an infant who is a main wearer of a pants-type diaper, as shown in FIG. 7, the center position of the upper waistline D1 of the abdominal side A (the longitudinal direction of the diaper 1) Center distance CL between the longitudinal center line CL of the diaper 1 and 180 to 230 mm, and in the unfolded state of the diaper 1, the center position of the upper waistline portion D1 of the back side B (the diaper 1 The upper waistline portion D1 can be successfully brought into contact with the wearer's iliac region by setting the distance K2 between the longitudinal center line CL of the diaper 1 and the longitudinal center line CL of the diaper 1 to 180 to 230 mm. it can.

This value is determined by carrying out body measurements of about 350 infants who are the main wearees of pants-type diapers. Specifically, as shown in FIG. 12, this value is obtained by setting the center point of the ventral side at the horizontal position height of the upper anterior iliac spine as “the upper anterior iliac spine height front center” The center point of the dorsal side at the horizontal position of the iliac spine is defined as the “upper center of the upper anterior iliac spine” and the upper anterior iliac bone via the crotch from the center of the upper anterior iliac spine. The length to the center after the height of the spine is defined as the “upper and lower length of the superior anterior iliac spine”, and the numerical value obtained by adding the necessary length considering the thickness of the diaper material, etc. It is a bisection. By setting the distances K1 and K2 to 185 to 220 mm, particularly 195 to 215 mm, the upper waistline portion D1 can be brought into more successful contact with the wearer's iliac region.
In the case of an adult diaper, the upper waistline D1 can be brought into more successful contact with the wearer's iliac region by setting the distances K1 and K2 to 300 to 350 mm, particularly 305 to 335 mm.

In addition, in the case where the position of the peripheral edge of the waist opening 12 on the ventral side and the position of the peripheral edge of the waist opening 12 on the back side are not substantially deviated from the longitudinal center line CL of the diaper 1. , Refers to a straight line along the diaper width direction that passes through the midpoint in the longitudinal direction of the diaper 1 in the developed state.
On the other hand, for example, when the position of the peripheral edge of the waist opening 12 on the ventral side and the position of the peripheral edge of the waist opening 12 on the back side are shifted (not shown), they are shifted and extended. A diaper longitudinal center line CL is defined on the assumption that there is no region.

  In the diaper 1 according to the present embodiment, the diaper 1 is fixed to the wearer's body mainly by the fastening force of the waistline elastic member 23 disposed in the upper waistline portion D1. In other words, unlike the conventional pants-type diaper, the tightening force by the waist elastic member 24 arranged on the waist portion F is the main for fixing the diaper 1 to the wearer's body in the diaper 1 of the present embodiment. It is not a means. On the other hand, if the tightening force of the waist portion F is increased, the diaper 1 may be displaced.

  When the diaper 1 is worn, the lower waistline portion D2 is preferably in contact with the lower region (lower abdomen) of the wearer's iliac region. The width of the lower waistline portion D2 (that is, the length of the lower waistline portion D2 along the longitudinal direction of the diaper 1) is preferably 40 to 70 mm, particularly 45 to 65 mm.

  Next, the front crotch E will be described. The front crotch portion E refers to the foremost region when the crotch portion C is divided into four in the longitudinal direction. In the front crotch part E, a plurality of front crotch elastic members 26 are arranged over the entire width direction. The front crotch elastic member 26 is fixed in an extended state between the outer layer sheet 21 and the inner layer sheet 22 via the adhesive Q. Thereby, the front crotch gather G4 is formed in the front crotch E.

  A non-functionalized region 51 that prevents the elastic member from contracting is formed in a region of the outer packaging material 2 facing the absorbent main body 3. The non-functionalized region 51 in the present embodiment is formed without expressing the contraction force of the waistline elastic member 23 and the front crotch elastic member 26. As described in detail in the description of the manufacturing method described later, the non-functionalized region 51 is a continuous body 23S of the waistline elastic member 23 and the front crotch elastic that are disposed across the entire width direction of the outer packaging material 2 in the raw material state. The continuous body 26S of the member 26 is a region formed without partially expressing the contraction force. In order to prevent the contraction force from appearing, for example, a large number of convex portions and cutter blades that divide the elastic member, a large number of emboss pins that harden the elastic member by heat sealing, and the like are used.

By forming the non-functionalized region 51, a pair of separated in the width direction from the waistline elastic member continuous body 23 </ b> S and the front crotch elastic member continuous body 26 </ b> S disposed over the entire width direction of the outer packaging material 2. A waistline gather G1 and a front crotch gather G4 are formed.
The non-functionalized region 51 located between the pair of waistline gathers G1 in the width direction is formed without causing the contraction force to be exerted on the waistline elastic member continuous body 23S joined to the outer layer sheet 21 and the inner layer sheet 22. On the other hand, the non-functionalized region 51 located between the pair of front crotch gathers G4 in the width direction is the front crotch elastic member continuous body 26S joined to the outer layer sheet 21 and the inner layer sheet 22. It is formed without developing the contractile force.

A leg elastic member cutting region 52 is formed at a position that is the center of the crotch C in the width direction. The leg elastic member cutting region 52 is a continuous body 25S of leg elastic members 25 arranged in a curved shape in the entire width direction of the outer packaging material 2 in the raw material state, as will be described in detail in the description of the manufacturing method described later. Is a region cut at a position that is the central portion in the width direction of the crotch portion C. In order to form the leg elastic member cutting region 52, for example, a large number of convex portions and cutter blades that divide the elastic member are used.
By forming the leg elastic member cutting region 52, the leg elastic member continuous body 25 </ b> S disposed in a curved shape in the entire width direction of the outer packaging material 2, in the width direction center of the crotch C in the width direction. A pair of separated leg elastic members 25, 25 are formed.

In the present embodiment, the composite stretchable part 4 is not provided in the crotch part C of the outer packaging material 2.
As the leg elastic member 25 and the front crotch elastic member 26, elastic materials such as natural rubber, polyurethane resin, foamed urethane resin, and hot melt elastic member are formed into a thread shape (thread rubber) or a belt shape (flat rubber), respectively. Those formed are preferably used.

Next, the composite elastic part 4 which forms the waistline gather G1 and the waist gather G2 in this embodiment is explained in full detail. As shown in FIGS. 13 and 17, the composite stretchable part 4 has the following configurations (1) to (3).
(1) The outer layer sheet 21 and the inner layer sheet 22 are joined to each other by an intermittent joining portion 41 in the stretching direction (X direction) of the composite stretchable portion 4 and the direction (Y direction) perpendicular thereto.
(2) The composite stretchable portion forming elastic member 42 is disposed so as not to pass through the joint portion 41 and is fixed to the outer layer sheet 21 and the inner layer sheet 22 at portions excluding both ends of the composite stretchable portion forming elastic member 42. Not.
(3) Each of the outer layer sheet 21 and the inner layer sheet 22 forms a plurality of ridges 43 extending continuously across a plurality of composite stretchable part forming elastic members 42.

  In the present embodiment, the waistline gather G1 formed from the composite stretchable part 4 is composed mainly of the outer layer sheet 21, the inner layer sheet 22, and the waistline elastic member 23, and the waist gather G2 formed from the composite stretchable part 4. Is mainly composed of an outer layer sheet 21, an inner layer sheet 22, and a waist elastic member 24. Thus, although the elastic member which comprises it differs with gathers, in the following description of the composite expansion-contraction part 4, the elastic member which comprises the composite expansion-contraction part 4 is demonstrated as the "composite expansion-contraction part formation elastic member 42".

  As shown in FIGS. 13 and 17, the outer layer sheet 21 and the inner layer sheet 22 constituting the composite stretchable part 4 are respectively in the stretch direction (X direction) of the composite stretchable part 4 and the direction (Y direction) perpendicular thereto. The joints 41 are intermittently joined together. The joint portion 41 is formed by, for example, a heat-sealing method such as heat sealing, high-frequency sealing, or ultrasonic sealing, or an adhesive or adhesive bonding method, and is preferably formed by a heat-sealing method. The composite stretchable part 4 is preferably configured such that all the composite stretchable part forming elastic members 42 do not pass through all the joints 41.

  If the joint portion 41 can be formed without cutting the elastic member 42, for example, in the case of the joint portion 41 formed by the bonding method, some composite stretchable portion forming elastic members 42 are partly due to manufacturing errors. It may pass through the joint 41. Even if some composite stretchable part forming elastic member 42 passes through a part of the joints 41, the effect of the present invention is sufficiently achieved. Therefore, in the case where the composite stretchable part forming elastic member 42 does not pass through 80% (pieces / pieces) or more of the joined parts 41 provided in the composite stretchable part 4, the composite stretchable part forming elastic member It is assumed that 42 is configured not to pass through the joint portion 41.

  The plurality of composite stretchable part forming elastic members 42 are arranged in parallel to each other and extend along the longitudinal direction of the composite stretchable part 4. When a plurality of composite stretchable part forming elastic members 42 are arranged in parallel to each other as in this embodiment, the stretchable direction of the composite stretchable part 4 is the same direction as the direction in which the composite stretchable part forming elastic member 42 extends. It is. In the case where the plurality of composite stretchable part forming elastic members 42 are not arranged in parallel to each other, the stretchable direction of the composite stretchable part 4 extends over a plurality of composite stretchable part forming elastic members 42 (described later). In the direction perpendicular to the direction in which the ridges 43 extend.

  FIG. 13 is a diagram illustrating an arrangement pattern of the joint portions 41. The joint portions 41 are formed so as to form rows in the stretching direction (X direction) of the composite stretchable portion 4 and the direction (Y direction) perpendicular thereto, and the joint portions 41 constituting the row in the perpendicular direction are formed. It is formed between each of the composite stretchable part forming elastic members 42. In a natural state (a state where no external force is applied), the composite stretchable part forming elastic member 42 contracts, and each of the outer layer sheet 21 and the inner layer sheet 22 extends over a plurality of composite stretchable part forming elastic members 42. A plurality of gathers 43 that are continuously extended are formed. In the present embodiment, a single collar 43 is formed between the joint portions 41, 41 adjacent to each other in the stretching direction (X direction) of the composite stretchable portion 4.

  From the viewpoint of reliably forming the flange 43 extending continuously over the plurality of composite stretchable part forming elastic members 42, when the composite stretchable part 4 extends, the joint part in the stretchable direction (X direction) of the composite stretchable part 4 The pitch P2 of 41 (see FIG. 13) is preferably 1 to 20 mm, particularly 3 to 10 mm, and the length L2 (see FIG. 13) of each joint 41 is 0.1 to 5 mm, particularly 0.2. It is preferable that it is -1.5mm. The ratio (P2 / L2) between the pitch P2 and the length L2 is preferably 1.1 to 200, particularly 2 to 50.

  In the composite stretchable part 4, the pitch P3 (see FIG. 13) of the joints 41 in the direction orthogonal to the stretch direction (Y direction) is preferably 1 to 40 mm, particularly 2 to 15 mm. The length L3 (see FIG. 13) is preferably 0.5 to 20 mm, particularly 1 to 10 mm. The ratio (P3 / L3) between the pitch P3 and the length L3 is preferably 1.05 to 80, particularly 1.05 to 15.

  In the composite stretchable part 4, the outer layer sheet 21 and the inner layer sheet 22 are preferably not joined to each other at a part other than the joint part 41. Each composite stretchable part forming elastic member 42 is arranged in the composite stretchable part 4 so as not to pass through the joint part 41 between the outer layer sheet 21 and the inner layer sheet 22, and excludes both ends of the composite stretchable part forming elastic member 42. The portion is not fixed to the outer layer sheet 21 and the inner layer sheet 22. That is, each composite stretchable part forming elastic member 42 is fixed to the outer layer sheet 21 and the inner layer sheet 22 only at both ends thereof.

The both ends of the composite stretchable part forming elastic member 42 are located between the outer layer sheet 21 and the inner layer sheet 22 in a state sandwiched between the outer layer sheet 21 and the inner layer sheet 22 at both ends 44 (only one shown) of the composite stretchable part 4. It is fixed to. Both end portions 44 of the composite stretchable portion 4 differ depending on the gathers formed thereby. In the embodiment shown in FIG. 1, both end portions 44 of the composite stretchable part 4 that forms the waistline gather G1 are the vicinity of the side edge of the absorbent main body 3 and the side seal part 11, and the composite stretchable part that forms the waist gather G2. Both end portions 44 of the portion 4 are both side seal portions 11, 11.
In addition, you may form the both ends 44 of the composite expansion-contraction part 4 so that expansion-contraction is possible.

  Each ridge 43 in the outer layer sheet 21 and the inner layer sheet 22 is formed so as to protrude from both surfaces of the composite stretchable portion 4, and a convex curved surface having an arcuate cross section is formed at the tip in the protruding direction of each ridge 43. Has been. The convex curved surface continuously extends in a direction (Y direction) orthogonal to the expansion / contraction direction of the composite expansion / contraction part 4. In this embodiment, one ridge 43 is formed between the joint portions 41 and 41 adjacent to each other in the expansion / contraction direction (X direction) of the composite expansion / contraction part 4, and these ridges 43 are composed of the composite expansion / contraction part. It extends continuously in a direction (Y direction) orthogonal to the expansion / contraction direction of the composite expansion / contraction part 4 without being divided at a portion overlapping the forming elastic member 42.

  In the composite stretchable part 4 in the present embodiment, each of a large number of ridges 43, 43 formed by contraction of the composite stretchable part forming elastic member 42 is continuous in a direction (Y direction) orthogonal to the stretchable direction of the composite stretchable part 4. Because it stretches, it looks very beautiful.

Moreover, the composite elastic part 4 in this embodiment can prevent the increase in rigidity, and the degree of freedom of deformation of the flange 43 with respect to external force is improved. The prevention of the increase in rigidity and the improvement in the degree of freedom of deformation of the flange 43 are such that the composite stretchable portion forming elastic member 42 has a trough between the flange 43 and the flange 43 in the outer layer sheet 21, and the flange 43 in the inner layer sheet 22. It exists in the state pinched | interposed between the trough part between the ridges 43, and is not joined to any of the outer layer sheet 21 and the inner layer sheet 22 including the part sandwiched between those trough parts. And the outer layer sheet 21 and the inner layer sheet 22 in the composite stretchable part 4 are continuously joined in any of the stretchable direction (X direction) of the composite stretchable part 4 and the direction (Y direction) perpendicular thereto. Is not based on that.
Furthermore, due to a synergistic effect with the tip of the collar 43 forming a convex curved surface, a volume appears in the thickness direction of the outer layer sheet 21 and the inner layer sheet 22 and the touch when touching the surface of the composite stretchable part 4 is felt. It is very soft and feels very good.

  Moreover, since the composite elastic part forming elastic member 42 in the composite elastic part 4 is present in a state where it is not joined to the outer layer sheet 21 and the inner layer sheet 22, the amount of hot melt adhesive used is suppressed to zero or a small amount. Can do. In particular, as in the present embodiment, when the outer layer sheet 21 and the inner layer sheet 22 are joined to each other by the joining portion 41 by heat fusion, the effect of reducing the amount of adhesive used is more remarkable. Since the amount of hot-melt adhesive used is small, air permeability and moisture permeability are not impaired.

The material for forming the composite stretchable part 4 in this embodiment will be described.
The outer layer sheet 21 and the inner layer sheet 22 may be an air-through nonwoven fabric, a heat roll nonwoven fabric, a spunlace nonwoven fabric, a spunbond nonwoven fabric, a melt blown nonwoven fabric, etc. preferable.

  In the composite stretchable part 4, the outer layer sheet 21 and the inner layer sheet 22 are deformed by the shrinkage of the composite stretchable part forming elastic member 42 to form the flange 43. That is, the rigidity of the outer layer sheet 21 and the inner layer sheet 22 is one of the factors that determine the formability and cushioning properties of the collar 43 of the composite stretchable part 4. The rigidity of each sheet can be expressed by its buckling strength. The buckling strength of the sheet used for the composite stretchable part 4 is preferably 100 cN or less, particularly preferably 70 cN or less. Here, the buckling strength is measured by a compression test mode of a Tensilon universal testing device (manufactured by Orientec Co., Ltd.) as shown below.

Buckling strength test method (CD):
A rectangular test piece having a length of 150 mm in the machine flow direction (MD direction) and a length of 30 mm in a direction orthogonal to the machine flow direction (CD direction) is rounded to create a cylinder having a diameter of 45 mm. The upper and lower ends are stopped with a stapler or the like to obtain a measurement sample. This is measured in the measurement environment of 20 ° C. and 65% RH under the measurement conditions of a compression speed of 10 mm / min and a measurement distance of 20 mm by the compression test mode of the Tensilon universal testing apparatus. The maximum strength when the measurement sample is compressed by 20 mm is measured for each measurement sample, the average value is obtained, and this is taken as the buckling strength.

As described above, non-woven cloth is preferably used as the outer layer sheet 21 and the inner layer sheet 22. The basis weight of the nonwoven fabric is preferably 5 to 50 g / m ² , particularly preferably 18 to 30 g / m ² . The buckling strength of the nonwoven fabric having such a basis weight is preferably 50 cN or less, particularly preferably 30 cN or less in the CD direction, and preferably 70 cN or less, particularly preferably 50 cN or less in the MD direction.

In addition, the outer layer sheet 21 and the inner layer sheet 22 are made of a heat-fusible resin from the viewpoint of facilitating joining by heat-sealing (formation of the joining portion 41). Is preferred. Examples of the heat-fusible resin include polyethylene and polypropylene. The fiber may be a core-sheath type composite fiber whose sheath is made of a heat-fusible resin.
The outer layer sheet 21 and the inner layer sheet 22 may be formed of the same material or different materials.

The outer layer sheet 21 and the inner layer sheet 22 have different shapes in the embodiment shown in FIG. 1, but may have the same shape in the present invention. In that case, as an alternative to the extension region 21B of the outer layer sheet 21 in the embodiment shown in FIG. 1, a pressing sheet separate from the outer layer sheet 21 and the inner layer sheet 22 is used, and the pressing body allows the absorbent main body to be used. It is preferable to cover the skin contact surface side at both longitudinal ends of 3. As for this pressing sheet, the part which overlaps with the longitudinal direction both ends of the absorptive main body 3 is adhere | attached through the adhesive agent over the substantially full width of the absorptive main body 3, and, thereby, the longitudinal direction both ends of the absorptive main body 3 Is preferably fixed to the outer packaging material 2.
Further, the outer layer sheet 21 and the inner layer sheet 22 are not limited to two separate sheets, but one sheet is folded to form two opposing surfaces, and a portion constituting one surface is an outer layer. The portion constituting the sheet 21 and the other surface may be the inner layer sheet 22.

  As a material for forming the composite stretchable part forming elastic member 42 in the composite stretchable part 4, various known elastic materials used for absorbent articles such as disposable diapers and sanitary napkins can be used without particular limitation. Examples of the elastic material include synthetic rubber such as styrene-butadiene, butadiene, isoprene, and neoprene, natural rubber, EVA, stretchable polyolefin, and polyurethane. As a form of the elastic member 42 for forming the composite stretchable part, the cross section is a rectangular shape, a square shape, a circular shape, a polygonal shape or the like (thread rubber or the like) or a string (flat rubber or the like), or a multifilament type thread or the like. Can be used.

  Another factor that determines the formability of the collar 43 of the composite stretchable part 4 is the expansion ratio and the stretch stress of the composite stretchable part forming elastic member 42. In order to make the cross-sectional shape of the flange 43 convex, the required expansion ratio and expansion / contraction stress of the composite elastic part forming elastic member 42 are required. The composite stretchable part forming elastic member 42 is preferably bonded to the outer layer sheet 21 and the inner layer sheet 22 in a stretched state of 20 to 1000%, particularly preferably 50 to 400%. Then, the composite stretchable portion forming elastic member 42 contracts, and the contracted portion of the outer layer sheet 21 and the inner layer sheet 22 remain, and the remaining outer layer sheet 21 and inner layer sheet 22 are on the opposite side of the bonding surface of the joint portion 41. The flange 43 is formed by deforming in a direction (outside) into a convex shape in cross section.

  As described above, the height of the flange 43 is an important element related to the moldability and cushioning properties, and the selection of the arrangement pattern and interval of the joint portions 41, the material of the outer layer sheet 21 and the inner layer sheet 22, the elastic member, and the like. Thus, it can be arbitrarily designed. The height of the flange 43 is preferably about 1 to 15 mm on one side. In order to increase the height of the ridge 43, the composite stretchable portion forming elastic member 42 is contracted to the extent that the interval between the adjacent joint portions 41 is narrowed to form the convex ridge 43. The stretchable part 4 can be formed. When forming the collar 43 having a height h on one side, the interval between the joint portions 41 needs to be at least 2 × h, and when the interval between the joint portions 41 is 2 × h, the composite stretchable portion The forming elastic member 42 needs to contract to such an extent that the adjacent joint portions 41 are adjacent to each other.

  One of the preferable elastic members for forming a composite stretchable part 42 is natural rubber (or synthetic rubber). Examples of natural rubber (synthetic rubber) include low modulus elastic members having a thickness of 0.05 to 1.5 mm and a width of 0.2 to 5 mm. In this elastic member, the stress at 100% elongation in a single yarn is preferably 1 to 70 gf, more preferably 1 to 40 gf, and particularly preferably 1 to 30 gf. By providing a plurality of single yarns of the elastic member having a low modulus at a high elongation ratio of preferably 100% or more, particularly preferably 200% or more, a composite stretchable part 4 having a beautiful heel 43 that stretches softly is obtained. Can do.

  Other preferred elastic members include polyurethane spandex elastic fibers. As the elastic fiber, one having a single yarn size of 10 to 3360 denier, particularly preferably 70 to 1120 denier is used. Denier is a unit representing the thickness of a yarn, and a yarn of 1 g at 9000 m is called 1 denier. It is preferable to use the spandex elastic fiber by stretching it to 30 to 500%.

  Next, the composite elastic part 4 in the side cuff 35 will be described. As described above, in the side cuff 35, the facing side elastic cuff forming sheet 37, which is composed of the side cuff forming sheet 37, and another composite elastic part upper surface forming sheet 45, and the both sides 37, 45 are disposed. A planar composite stretchable part that stretches in the width direction of the absorbent main body 3 in the vicinity of the free end of the side cuff 35 from the composite stretchable part forming elastic member 42 composed of the plurality of lateral cuff widthwise elastic members 38 4 is formed.

The composite stretchable portion 4 in the side cuff 35 also has the same configuration as the composite stretchable portion 4 that forms the waistline gather G1 and the waist gather G2. Therefore, the composite stretchable portion 4 in the side cuff 35 is The description regarding the composite elastic part 4 which forms the gather G1 and the waist gather G2 is used suitably.
The main difference between the composite stretchable part 4 in the side cuff 35 and the composite stretchable part 4 forming the waistline gather G1 and the waist gathers G2 will be described. The composite stretchable part forming sheet includes the waistline gather G1 and the waist gathers G2. In the composite stretchable part 4 to be formed, the outer layer sheet 21 and the inner layer sheet 22 are formed. On the other hand, in the composite stretchable part 4 in the side cuff 35, the side surface of the side cuff forming sheet 37 and another composite stretchable part are formed. This is a sheet 45. Further, the composite stretchable part forming elastic members are the waistline elastic member 23 and the waist elastic member 24 in the composite stretchable part 4 forming the waistline gather G1 and the waist gather G2, respectively, whereas the composite stretchable part 4 is formed in the side cuff 35. In the stretchable part 4, it is a side cuff width direction elastic member 38.
As described above, the composite stretchable part 4 in the side cuff 35 and the composite stretchable part 4 forming the waistline gather G1 and the waist gather G2 are different from each other in the composite stretchable part forming sheet and the composite stretchable part forming elastic member. The structure of the composite stretchable part 4 itself is the same.

In this embodiment, the composite expansion-contraction part 4 in the side cuff 35 is equipped with the structure of following (1)-(3), as shown in FIG.6, FIG13 and FIG.17.
(1) The composite stretchable part forming sheet (the side cuff forming sheet 37 and the composite stretchable part upper surface forming sheet 45) is intermittent in the stretchable direction (X direction) of the composite stretchable part 4 and the direction (Y direction) perpendicular thereto. They are joined to each other by the joint 41.
(2) The composite stretchable portion forming elastic member 42 (side cuff width direction elastic member 38) is arranged so as not to pass through the joint portion 41, and in a portion excluding both ends of the composite stretchable portion forming elastic member 42. It is not fixed to the side cuff forming sheet 37 and the composite stretchable part upper surface forming sheet 45.
(3) Each of the side cuff forming sheet 37 and the composite stretchable part upper surface forming sheet 45 forms a plurality of ridges 43 extending continuously over a plurality of composite stretchable part forming elastic members 42.

Next, the expansion ratio of the waist part F will be described. In the disposable diaper of the present invention, the waist portion F has an elongation rate at the center portion 2A in the width direction of the outer packaging material 2 lower than an elongation rate at the outer side portion 2B in the width direction of the outer packaging material 2. Such a difference in elongation rate can be easily realized by forming the waist gather G2 from the composite stretchable part 4.
The central portion 2A (see FIG. 14) in the width direction of the outer packaging material 2 is a region facing the absorbent main body 3 in the outer packaging material 2 in the unfolded state, and as in the embodiment shown in FIG. In the case where the longitudinal end of the outer casing 2 is retracted inward in the longitudinal direction from the longitudinal end of the outer packaging material 2, the longitudinal end of the absorbent main body 3, the longitudinal end of the outer packaging material 2, And the area | region enclosed by the straight line extended toward the longitudinal direction both ends of the outer packaging material 2 from each longitudinal direction both ends of the absorptive main body 3 is also contained in the width direction center part 2A of the outer packaging material 2.
The width direction outer side part 2B of the outer packaging material 2 is an area | region located in the width direction both sides of 2 A of width direction center parts, as shown in FIG.

The elongation rate of the waist part F is measured by the following method.
[Measurement method of elongation rate of waist F]
(1) About the diaper 1 of the unstretched state, the mark of 20 mm in length is attached to the width direction center part 2A of the waist F along the width direction.
(2) The both ends of this mark are gripped and the diaper 1 is extended in the width direction.
(3) The length of the mark after extension (distance between both ends) L4 is measured.
(4) Let (L4 / 20) × 100 (%) be the elongation ratio of the center portion 2A in the width direction of the waist F.
(5) The elongation rate of the width direction outer side portion 2B of the waist F is also measured in the same manner as the elongation rate of the width direction center portion 2A of the waist F (differing in that the position to be marked is the width direction outer side portion 2B). Can do.

  The elongation ratio of the center portion 2A in the width direction of the waist portion F is preferably 130 to 280%, more preferably 150 to 250%. The elongation ratio of the width direction outer side portion 2B of the waist portion F is preferably 150 to 400%, more preferably 200 to 320%. The difference between the elongation rate of the width direction outer side portion 2B of the waist portion F and the elongation rate of the width direction center portion 2A of the waist portion F is preferably 20 to 120%, more preferably 50 to 70%.

  Next, the tensile load of the waist part F will be described. The waist portion F preferably has a tensile load of 20 gf or more, and more preferably 30 gf or more when the circumference is extended to 300 mm. The reason why the load when the circumferential length of the waist portion F is extended to 300 mm is defined in the infant diaper because the circumferential length of the waist portion F in the non-wearing state is about 300 mm. If the load when the circumference of the waist portion F is extended to 300 mm is less than 20 gf, the appearance is poor.

In addition, the waist portion F preferably has a load of 200 gf or less, more preferably 180 gf or less, when the circumference is extended to 500 mm. The reason why the stress when the circumference of the waist F is extended to 500 mm is specified is that the circumference around the stomach of a large infant, that is, the maximum circumference of the waist F in the worn state is about 500 mm. is there. If the load when the circumference of the waist portion F is extended to 500 mm is more than 200 gf, the force required to stretch and expand the waist portion F (waist opening 12) when the diaper is mounted is not preferable.
The tensile load of the waist part F can be set, for example, by adjusting the material, thickness, elongation rate, disposition interval, disposition number, and the like of the waist elastic member 24.

The tensile load of the waist part F is measured by the following method.
[Measurement method of tensile load of waist F]
(1) The waist part F is cut out from the diaper in a ring-like state where the side seal part 11 is connected, and this is used as a sample. This sample was placed on a horizontal surface, and the length between both ends of the sample (between the pair of side seal portions 11 and 11) in a naturally contracted state was measured. To do.
(2) Both ends of the sample are fixed between chucks of a Tensilon tensile tester [Orientec Co., Ltd., “RTC-1150A”], and the load at that time is set to zero.
(3) The load when extending between the both ends of the sample at the speed of 300 mm / min from the initial length in the same direction as the width direction of the diaper until the circumference of the waist F becomes 300 mm or 500 mm, It is referred to as “load when the length is extended to 300 mm” or “load when the circumference is extended to 500 mm”.

Further, when the tensile loads of the waist portion F, the upper waistline portion D1, and the lower waistline portion D2 are compared, the tensile load of the upper waistline portion D1 is the highest, then the tensile load of the waist portion F is high, and the lower waistline portion D2 It is preferable that the tensile load is the lowest. The tensile load in the upper waistline portion D1 and the lower waistline portion D2 can be set by adjusting, for example, the material, thickness, elongation rate, placement interval, number of placements, and the like of the waistline elastic member 23.
By providing such an order in the tensile load of each part, the diaper 1 during wearing is effectively prevented from slipping off, and the diaper 1 adheres to the wearer's body without a sense of incongruity, and liquid leakage is effective. Is prevented. The tensile load of the upper waistline portion D1 and the lower waistline portion D2 is measured in the same manner as the tensile load of the waist portion F.

  Next, physical properties when the space between the pair of side seal portions 11 and 11 is extended in a diaper state will be described. The circumferential length of the waist portion F when the pair of side seal portions 11, 11 are extended in the width direction up to a load of 2400 gf is preferably 650 mm or more, and more preferably 660 mm or more. “The circumference of the waist portion F when the width between the pair of side seal portions 11 and 11 is extended in the width direction to a load of 2400 gf” means that the entire diaper is grasped by gripping the pair of side seal portions 11 and 11. It is the circumference when the extension load reaches 2400 gf by gradually extending in the width direction. The larger the circumference of the waist part F, the easier it is to put an infant's foot and the easier it is to wear it.

  And it is preferable that the energy required for expansion | extension of this waist part F is 4 N * m or less, and it is still more preferable that it is 3.5 N * m or less. The reason why the load of 2400 gf is defined is that the maximum load that the mother can expand the diaper in the width direction is generally about 2400 gf. If the energy required for stretching the waist portion F exceeds 4 N · m, it is difficult for the mother to expand the diaper in the width direction. The smaller the energy, the easier the diaper 1 is stretched in the width direction, and thus the easier it is to put the diaper 1 on.

The energy required for extension of the waist part F is measured by the following method.
[Measurement method of energy required for stretching waist part F]
(1) The diaper itself is used as a sample. This sample was placed on a horizontal surface, and the length between both ends of the sample (between the pair of side seal portions 11 and 11) in a naturally contracted state was measured. To do.
(2) Both ends of the sample are fixed between chucks of the Tensilon tensile tester “RTC-1150A”, and the load at that time is set to zero.
(3) The both ends of the sample are extended from the initial length at a speed of 300 mm / min in the same direction as the width direction of the diaper until the load reaches 2400 gf.
(4) From the area of the SS curve (load-strain curve) obtained at that time, the energy required for expansion of the waist portion F is obtained.

  According to the pants-type disposable diaper of the first embodiment having the above configuration, the planar stretchable part in the vicinity of the free end of the side cuff 35 is formed from the composite stretchable part 4, so that the composite stretchable part forming sheet (side The original texture of the side cuff forming sheet 37 and the composite stretchable portion upper surface forming sheet 45) can be utilized, the feel of the planar stretchable portion is soft, and the rubber marks are not easily attached by the planar stretchable portion. In addition, since the stretchability of the planar stretchable part can be exhibited without substantially using a hot melt adhesive, the planar stretchable part and the wearer's skin are excellent in air permeability at the planar stretchable part. Since the heel 43 of the composite stretchable part 4 becomes a contact surface with the wearer, the cushioning property of the planar stretchable part is excellent.

  Further, in the composite stretchable part 4 in the side cuff 35, a composite stretchable part forming elastic member (side cuff width direction elastic member 38) is arranged along the width direction of the absorbent main body 3, and the composite stretchable part 4. Since the heel 43 extends along the longitudinal direction of the absorbent main body 3, the followability of the planar stretchable part to the wearer's skin is high, and the side leakage from between the planar stretchable part and the wearer's skin It is excellent in preventing property, especially in preventing the side leakage of soft stool. Further, the standing property of the side cuff 35 is improved.

  In addition, the waist gather G1 and the waist gather G2 are formed from the composite stretchable portion 4, and the stretchability of the gather can be expressed without substantially using a hot melt adhesive. And the breathability in the back side part B is excellent. Moreover, the raw material original texture of the outer-layer sheet 21 and the inner-layer sheet 22 of the outer packaging material 2 can be utilized, and it is soft and not stiff.

  In the composite stretchable part 4, the contractile force of the composite stretchable part forming elastic member 42 is not inhibited at all (or almost), so the contractive force is utilized to the maximum extent. For example, when the expansion and contraction characteristics are graphed by taking the circumference of the waistline D on the horizontal axis and the tensile load of the waistline D on the vertical axis, it can be seen that the slope of the characteristic curve is gentle, that is, the stretchability is high. In addition, the stress difference between the characteristic curve at the time of expansion and the characteristic curve at the time of contraction is small, i.e., the stress fluctuation with respect to the fluctuation of the circumference is small. It can be seen that the size application range of the person increases.

Therefore, since the shrinkage force is high, it fits gently to the wearer and is difficult to slip off. Moreover, since the whole diaper shrinks to the maximum extent, there is an advantage that it looks compact. Moreover, since the usage-amount of the composite elastic part formation elastic member 42 can be reduced, it is advantageous also in terms of cost.
Since the heel 43 is formed on the outer surface of the composite stretchable portion 4 and the heel 43 is a contact surface with the wearer, the composite stretchable portion 4 has a high cushioning property when worn and fits gently to the wearer's skin. Less damage. Moreover, since the collar 43 is also arranged on the outer surface of the outer packaging material 2 (the outer surface when worn), the outer surface feels excellent.

  Next, one manufacturing method for continuously producing the pants-type disposable diaper shown in FIG. 1 will be described with reference to the drawings. FIG. 15 is a perspective view showing the entire manufacturing method. FIG. 16 is a conceptual diagram showing mainly the steps of forming the composite stretchable part, the non-functionalized region, and the leg elastic member cutting region in the outer packaging material in the present manufacturing method. FIG. 17 is a conceptual diagram showing mainly the step of forming the composite stretchable part in the present manufacturing method. FIG. 20 is a perspective view showing a step of forming a side cuff in the manufacturing method. FIG. 21 is a conceptual diagram showing a step of joining side cuffs to the absorbent main body in the present manufacturing method.

As shown in FIGS. 15 to 17, the manufacturing method includes a step of joining the outer layer sheet 21 and the inner layer sheet 22 with the joint portion 41 to form the composite stretchable portion 4, and the outer packaging material forming elastic members 23 and 26. The same roll 62 is used to perform the step of forming the non-functionalized region 51 without expressing the contraction force.
In this manufacturing method, as shown in FIG. 15, the continuous body 21S of the outer layer sheet 21 and the continuous body 22S of the inner layer sheet 22 are interposed between the continuous bodies 23S of the outer packaging material forming elastic members 23, 24, 25, 26. 24S, 25S, and 26S are sandwiched and joined to form a continuous body 2S of the outer packaging material 2, and then the absorbent main body 3 is placed on the inner layer sheet continuous body 22S side of the outer packaging material continuous body 2S on the main body joint portion 15 (FIG. 4). The diaper continuum 1S is formed by joining the diapers, and then the diaper continuum 1S is divided to form individual diapers 1.

This manufacturing method will be described in detail. The outer layer sheet continuous body 21 </ b> S is used as the original sheet of the outer layer sheet 21, and the inner layer sheet continuous body 22 </ b> S is used as the original sheet of the inner layer sheet 22.
Each continuous body 23S, 24S, 25S, 26S of each outer packaging material forming elastic member 23, 24, 25, 26 is introduced between the outer layer sheet continuous body 21S and the inner layer sheet continuous body 22S in an expanded state. . In addition, in FIG. 16, illustration of the continuous body 26S of the front crotch elastic member 26 is abbreviate | omitted. Before the outer layer sheet continuum 21S and the inner layer sheet continuum 22S merge, the coating positions shown in FIGS. 8 and 9 are formed on the respective facing surfaces by the adhesive coating device 64 (see FIG. 16) or the like. The hot melt adhesive Q is applied to the surface. Further, the continuous body 25S of the leg elastic member 25 is swung so as to follow the shape of the leg opening 13 by a swing guide 65 (see FIG. 16), while the outer layer sheet continuous body 21S and the inner layer sheet continuous body 22S. Introduced between.

Both sheet continuums 21S, 22S are narrowly pressed between the pair of nip rolls 61, 61 with the outer packaging material forming elastic member continuums 23S, 24S, 25S, 26S interposed therebetween. As a result, an outer packaging material continuous body 2S is obtained in which the outer packaging material forming elastic member continuous bodies 23S, 24S, 25S, and 26S are sandwiched and joined between the two sheet continuous bodies 21S and 22S. Here, the waistline elastic member 23 is not joined by the hot-melt adhesive Q in a region between the side edge portion of the absorbent main body 3 and the side seal portion 11. Similarly, the waist elastic member 24 is not joined by the hot melt adhesive Q in a region between the pair of side seal portions 11.
At this time, the composite stretchable part 4, the non-functionalized region 51, and the leg elastic member cutting region 52 are not formed in the outer packaging material continuous body 2S.

Next, the outer wrapping material continuous body 2 </ b> S in which the composite stretchable part 4 or the like is not formed is introduced between the composite stretchable part forming roll 62 and the anvil roll 63. The composite stretchable part forming roll 62 includes a composite stretchable part forming part 62A that forms the composite stretchable part 4 on its peripheral surface, and a non-functionalized region forming part 62B that forms the nonfunctionalized region 51 and leg elastic member cutting. A leg elastic member cutting region forming part 62 </ b> C that forms the region 52 is provided.
The anvil roll 63 is a receiving roll for the composite stretchable part forming roll 62, and its peripheral surface is a smooth surface.

  A plurality of embossed pins 62D (see FIG. 17) are provided in the composite stretchable part forming part 62A of the composite stretchable part forming roll 62 in correspondence with the joint part 41 of the composite stretchable part 4, and the composite stretchable part forming part 62A. According to this, the joining part 41 can be formed in the area | region corresponding to the composite expansion-contraction part 4 in the outer packaging material continuous body 2S in which the composite expansion-contraction part 4 is not formed. The emboss spin 62D may be a heat emboss spin or an ultrasonic emboss spin. FIG. 17 is a conceptual diagram showing only elements closely related to the process of forming the composite stretchable part 4. Therefore, for example, only the composite stretchable part forming part 62A is illustrated on the peripheral surface of the composite stretchable part forming roll 62, and only the composite stretchable part 4 is illustrated for the outer packaging material continuous body 2S.

Then, as shown in FIGS. 18 and 19, the composite stretchable part forming elastic member 42 (corresponding to the waistline elastic member 23 and the waist elastic member 24 in the present manufacturing method) is contracted to each of the two sheet continuous bodies 21S and 22S. By forming the plurality of ridges 43, the composite stretchable part 4 forming the waistline gather G1 and the waist gather G2 is obtained in a predetermined region of the outer packaging material continuum 2S. In the region where the extended region 21B of the outer layer sheet 21 exists, the extended region 21B also has a hook shape as shown in FIG.
18 is a cross-sectional view showing the composite stretchable part 4 in a region where the extension region 21B does not exist, and FIG. 19 is a cross-sectional view showing the composite stretchable unit 4 in a region where the extension region 21B exists.

  The non-functionalized region forming part 62B of the composite stretchable part forming roll 62 is a part that prevents the contractive force of the elastic member from being expressed, and can form the non-functionalized region 51 in the outer packaging material continuous body 2S. The non-functionalized region forming part 62B is composed of a large number of convex portions and cutter blades that divide the elastic member, and a large number of emboss pins that harden the elastic member by heat sealing.

  The leg elastic member cutting region forming part 62C of the composite stretchable part forming roll 62 is a part for cutting the leg elastic member continuous body 25S existing at the position of the crotch part C in the center in the width direction. Can be formed. The leg elastic member cutting region forming part 62C is composed of, for example, a large number of convex parts and cutter blades. According to the leg elastic member cutting region forming portion 62C, the leg elastic members 25, 25 separated in the width direction at the center in the width direction of the crotch C can be obtained by cutting the leg elastic member continuous body 25S.

  Between the composite stretchable part forming roll 62 having the above configuration and the anvil roll 63, the outer envelope material continuous body 2S in which the composite stretchable part 4, the non-functionalized area 51, and the leg elastic member cutting area 52 are not formed is inserted. By doing so, the outer packaging material continuous body 2S in which the composite stretchable part 4, the non-functionalized region 51, and the leg elastic member cutting region 52 are formed in a predetermined region is obtained.

  Next, the formation process of the side cuff 35 will be described. The process of forming the composite stretchable part 4 in the side cuff 35 is the same as the process of forming the composite stretchable part 4 in the waistline gather G1 and the waist gather G2. Therefore, for the formation process of the composite stretchable part 4 in the side cuff 35, the description of the formation process of the composite stretchable part 4 in the waistline gather G1 and the waist gather G2 is appropriately incorporated.

  As shown in FIG. 20, a side cuff forming sheet continuous body 37 </ b> S is used as a raw material of the side cuff forming sheet 37. The adhesive 35 </ b> A is intermittently applied in the flow direction at a predetermined position on the upper surface of the lateral cuff forming sheet continuous body 37 </ b> S by the adhesive application device 74. Further, the continuous body 38S of the lateral cuff width direction elastic members 38 is supplied to the upper surface of the lateral cuff forming sheet continuous body 37S in parallel with the direction orthogonal to the flow direction in the stretched state, and the adhesive 35A. Joined by. Thereafter, the composite stretchable part upper surface forming sheet 45 cut in advance to a predetermined size so as to straddle the pair of adhesives 35A is intermittently provided in the flow direction on the upper surface of the lateral cuff forming sheet continuous body 37S. Be joined.

The lateral cuff forming sheet continuous body 37S, the composite stretchable part upper surface forming sheet 45, and the lateral cuff width direction elastic member continuous body 38S interposed therebetween are narrowed between the pair of nip rolls 71, 71. As a result, a side cuff continuous body 35S is obtained in which the side cuff width direction elastic member continuous body 38S is sandwiched and joined between the side cuff forming sheet continuous body 37S and the composite stretchable part upper surface forming sheet 45. Here, the side cuff width direction elastic member continuous body 38S is joined to the side cuff forming sheet continuous body 37S and the composite stretchable part upper surface forming sheet 45 only by the adhesive 35A.
At this time, the composite expansion / contraction part 4 is not formed in the side cuff continuous body 35S.

Next, the side cuff continuous body 35 </ b> S in which the composite stretchable part 4 is not formed is introduced between the composite stretchable part forming roll 72 and the anvil roll 73. The composite stretchable part forming roll 72 includes a composite stretchable part forming part 72A that forms the composite stretchable part 4 and a non-functionalized area forming part 72B that forms the nonfunctionalized area 51A on the peripheral surface thereof. The composite stretchable part forming part 72A of the composite stretchable part forming roll 72 has the same configuration as the composite stretchable part forming part 62A of the composite stretchable part forming roll 62 that forms the composite stretchable part 4 in the outer packaging material continuous body 2S. Yes. The non-functionalized region forming part 72B of the composite stretchable part forming roll 72 has the same configuration as the nonfunctionalized region forming part 62B of the composite stretchable part forming roll 62 that forms the nonfunctionalized region 51 in the outer packaging material continuous body 2S. Have.
The anvil roll 73 is a receiving roll for the composite stretchable part forming roll 72, and its peripheral surface is a smooth surface.

  By inserting the lateral cuff continuum 35S in which the composite stretchable part 4 and the non-functionalized region 51A are not formed between the composite stretchable part forming roll 72 having the above configuration and the anvil roll 73, the side In the region where the cuff width direction elastic member 38 is sandwiched between the side cuff forming sheet continuous body 37S and the composite stretchable portion upper surface forming sheet 45, the composite stretchable portion 4 is formed, and the adjacent composite stretchable portions 4, 4 A lateral cuff continuum 35S having a non-functionalized region 51A formed therebetween is obtained.

  Next, the side cuff continuous body 35S in which the composite stretchable part 4 and the non-functionalized region 51A are formed is cut at a predetermined position between the composite stretchable part upper surface forming sheets 45 separated in the flow direction (not shown). ) In the direction perpendicular to the flow direction. As a result, the side cuff forming sheet continuous body 37S is cut at a predetermined width to obtain a developed side cuff forming sheet 37 having a predetermined width, and the side cuff width direction elastic member continuous body 38S has a predetermined length. The side cuff width direction elastic member 38 having a predetermined length is obtained by being completely cut by (however, in many cases, already cut by the non-functionalized region forming portion 72B of the composite stretchable portion forming roll 72). .

In the side cuff forming sheet 37 thus obtained, side cuff longitudinal direction elastic members 36 are disposed in the vicinity of both side portions of the side cuff width direction elastic member 38, respectively. That is, the side cuff longitudinal direction elastic member 36 is disposed on the side cuff forming sheet 37 so as to connect the end portions of the side cuff width direction elastic members 38 arranged side by side.
Then, the inner side of the side cuff forming sheet 37 is folded so that the folded portion is positioned on the lower side to form a double structure, and between the side cuff forming sheets 37 of the double structure, The side cuff longitudinal elastic member 36 is sandwiched and joined by an adhesive 35B. Further, the outer side portion of the side cuff forming sheet 37 is folded downward, the lateral cuff longitudinal elastic member 36 on the outer side in the width direction is sandwiched, and bonded by the adhesive 35B.

Next, as shown in FIGS. 6 and 21, the side cuff width direction elastic member 38 is contracted to form a plurality of ridges 43 on each of the side cuff forming sheet 37 and the composite stretchable part upper surface forming sheet 45. At the same time, by folding the side cuff forming sheet 37 into a predetermined shape, the side cuff 35 having the composite stretchable part 4 in the vicinity of the free end is obtained.
A pair of such side cuffs 35 are formed symmetrically, and the obtained pair of side cuffs 35 are joined to both side portions of the absorbent main body 3 as shown in FIG.

  The pants-type disposable diaper 1 according to the embodiment includes a composite stretchable portion 4, a non-functionalized region 51, an outer packaging material continuous body 2S in which a leg elastic member cutting region 52 is formed, and a side cuff in which the composite stretchable portion 4 is formed. It can manufacture by performing each process after that using 35, similarly to each process in the manufacturing method of the conventional pants type disposable diaper of a so-called cross-flow type.

  For example, as shown in FIG. 15, the absorbent main body 3 obtained by cutting the absorbent main body continuous body 3S on the outer packaging material continuous body 2S is rotated 90 degrees with respect to the flow direction. Together with the side cuff 35 (not shown in FIG. 15), the main body joint 15 (see FIG. 4) is intermittently joined and fixed. The absorptive main body 3 and the side cuffs 35 are fixed to the outer packaging material continuum 2S while the stretched state of the outer packaging material continuum 2S is maintained. In other words, the absorbent main body 3 and the side cuffs 35 are fixed to the outer packaging material continuous body 2S while maintaining the outer packaging material continuous body 2S so as not to be contracted by the contraction force of the composite stretchable part 4 or the like.

  Next, as shown in FIG. 15, both sides of the outer packaging material continuum 2 </ b> S are folded back so as to cover both ends of the absorbent main body 3, and both sides of the outer packaging material continuum 2 </ b> S are formed at both ends of the absorbent main body 3. Then, the outer packaging material continuum 2S is folded in two with the absorbent main body 3. An adhesive is applied in advance to a predetermined position of the inner side of the region to be the extension region 21B in the outer packaging material continuous body 2S, the inner layer continuous sheet 22S, the absorbent main body 3, and the like.

Moreover, as shown in FIG.15 and FIG.16, the trim 13S for leg opening part formation is removed from the outer packaging material continuous body 2S with a rotary cutter, a laser cutter, etc., and the diaper continuous body 1S is obtained.
Then, the diaper continuous body 1S is folded back in the width direction (longitudinal direction of the disposable diaper 1) and folded in two. Next, after forming the side seal portions 11 and 11 by heat sealing, ultrasonic sealing, high frequency sealing or the like, or simultaneously with the formation of the side seal portions 11 and 11, the side seal portions 11 and 11 are divided into individual diapers. A pants-type disposable diaper 1 can be obtained.

  As a method of intermittently fixing the absorbent main body 3 by 90 degrees and intermittently fixing it on the outer packaging material continuum 2S, for example, a method described in JP-A-4-166150 can be used. Further, the main body joint 15 (see FIG. 4) for fixing the absorbent main body 3 to the outer packaging material continuum 2S may be applied to one or both of the absorbent main body 3 and the outer packaging material continuum 2S. it can. The trim 13S for forming the leg opening can be removed before the absorbent main body 3 is fixed to the outer packaging material continuous body 2S.

  According to this manufacturing method, the outer layer sheet 21 and the inner layer sheet 22 are joined by the joining part 41 to form the composite stretchable part 4, and the shrinkage force of the outer packaging material forming elastic members 23 and 26 is not expressed. Since the step of forming the functionalized region 51 is performed using the same roll 62, a pants-type disposable diaper provided with the composite stretchable part 4 and the non-functionalized region 51 can be efficiently produced.

  Next, other embodiment of the absorbent article of this invention is described. In the other embodiments, differences from the first embodiment described above will be mainly described, and the same points are denoted by the same reference numerals and description thereof will be omitted. For the points that are not particularly described, the description of the first embodiment is applied as appropriate. In other embodiments, the same effects as those of the first embodiment can be obtained.

  In the first embodiment, as shown in FIG. 22, the standing wall portion of the side cuff 35 may be formed from a side cuff forming sheet 37 having a single structure. In that case, the lateral cuff longitudinal direction elastic member 36 on the inner side in the width direction is sandwiched by, for example, the folded side cuff forming sheet 37 and joined by the adhesive 35B.

  In addition, as shown in FIG. 23, the pants-type disposable diaper of the second embodiment is different in the configuration of the composite stretchable part 4 in the side cuff 35 from the first embodiment. Specifically, in the composite stretchable part 4 in the side cuff 35, the facing composite stretchable part forming sheet is composed of two sheets 46 and 47 different from the side cuff forming sheet 37. That is, the side cuff forming sheet 37 is not a constituent member of the composite stretchable part 4. In other words, the composite stretchable part 4 is configured separately from the side cuff forming sheet 37.

  According to the second embodiment, since the composite stretchable part 4 in the side cuff 35 is configured separately from the side cuff forming sheet 37, the two composite stretchable part forming sheets 46, 47 and both sheets 46 are provided. , 47 can be easily manufactured with the composite stretchable part 4 mainly composed of the side cuff width direction elastic member 38. Therefore, since the side cuff 35 can be formed by joining the separate composite stretchable part 4 to the side cuff forming sheet 37, there is an advantage that there are few restrictions on the manufacturing process.

The configuration of the composite stretchable portion 4 is not limited to the configuration of the composite stretchable portion 4 shown in FIGS. 13 and 17. For example, the joint portions 41 may be arranged in a staggered manner as shown in FIG. That is, an array pattern in which the positions of the joint portions 41 are shifted by a half pitch (P1 / 2) between the row in the stretch direction (X direction) of the composite stretchable portion 4 and the row adjacent thereto.
More specifically, the joint portion 41 is formed so as to form a line (form a seal line) in the expansion / contraction direction (X direction) of the composite expansion / contraction portion 4 and the direction orthogonal to the expansion direction (Y direction). One joining portion 41 forming a row in the direction (Y direction) is formed for every two elastic members.
Between the column in the expansion / contraction direction (X direction) of the composite stretchable portion 4 and the row adjacent thereto, a region where the joint portion 41 does not exist is continuously formed between both end portions 44 of the composite stretchable portion 4. In this region, the composite stretchable part forming elastic member 42 is arranged in a non-joined state. As a result, two ridges 43 are formed between the joint portions 41 and 41 adjacent to each other in the stretching direction (X direction) of the composite stretchable portion 4.

  From the viewpoint of reliably forming the flange 43 extending continuously over the plurality of composite stretchable part forming elastic members 42, in the state where the composite stretchable part 4 is extended (the state shown in FIG. 24), The pitch P1 (see FIG. 24) of the joint portions 41 in the expansion / contraction direction (X direction) is preferably 1 to 30 mm, particularly 6 to 20 mm, and the length L1 (see FIG. 24) of each joint portion 41 is 0.1 to 5 mm, particularly preferably 0.2 to 1.5 mm. The ratio (P1 / L1) between the pitch P1 and the length L1 is preferably 1.1 to 300, particularly 4 to 100.

As mentioned above, although this invention was demonstrated based on the preferable embodiment, this invention is not restrict | limited to the said embodiment.
For example, in the composite stretchable portion 4 in the side cuff 35, the facing composite stretchable portion forming sheet can be composed of two side cuff forming sheets 37, and the folded double-structure side cuff It can also be configured from a forming sheet 37.
Only one side cuff longitudinal direction elastic member 36 may be provided per side cuff 35.

Both or one of the waistline gather G1 and the waist gather G2 may not be formed from the composite stretchable part 4. Moreover, the composite expansion-contraction part 4 can also be applied to gathers other than the waistline gather G1 and the waist gather G2.
The composite stretchable part 4 that forms the waistline gather G1 may be provided only in a region outward in the width direction from the absorbent main body 3.
The outer packaging material 2 is formed of a laminated body of an outer layer sheet 21 having the same shape as the outer packaging material 2 and a separated inner layer sheet 22 that exists only in the abdominal side A and the back side B and does not exist in the crotch C. May be. In the outer packaging material 2 having this configuration, the crotch portion C is formed only from the outer layer sheet 21.

  Although the said embodiment is a pants type disposable diaper provided with the outer packaging material, this invention is not restrict | limited to this and can be applied to the pants type disposable diaper which is not provided with the outer packaging material. Moreover, it is not restrict | limited to a pants type disposable diaper, It can apply to a deployment type disposable diaper. Moreover, if it is an absorbent article provided with the absorptive main body containing an absorptive core and the side cuff which is arranged along the both sides of the absorptive main body and stands on the skin contact surface side, it is limited to disposable diapers. It can be applied to sanitary napkins, incontinence pads and the like.

  The flanges 43 in the composite stretchable part 4 in the embodiment are continuously provided between the two composite stretchable part forming elastic members 42 located at both ends in the direction (Y direction) orthogonal to the stretchable direction of the composite stretchable part 4. However, the composite stretchable part forming elastic member 42 located in the vicinity of the end in the Y direction of the composite stretchable part 4 may be present in a state of being joined to the composite stretchable part forming sheet. However, it is preferable that the heel 43 is continuous over at least three, preferably half, particularly preferably 70% or more of the total number of the composite stretchable part forming elastic members 42. Further, the end of the composite stretchable part forming elastic member 42 bonded to the composite stretchable part forming sheet may be present inside the end 44 in the stretchable direction (X direction) of the composite stretchable part 4.

The number of the composite stretchable part forming elastic members 42 in the composite stretchable part 4 can be appropriately determined according to the size and use of the composite stretchable part 4, and can be, for example, 5 to 30. Further, the joining portion 41 can be formed by joining with an adhesive such as ultrasonic joining or hot-melt adhesive other than heat fusion.
Further, the arrangement pattern of the joint portions 41 can be changed as appropriate. The shape of the joint portion 41 can be an appropriate shape such as a rectangular shape, an oval shape, a circular shape, or a rhombus shape.

FIG. 1 is a perspective view showing a pants-type disposable diaper that is a first embodiment of the absorbent article of the present invention. FIG. 2 is a plan view showing a state in which the pants-type disposable diaper shown in FIG. 1 is developed and extended. FIG. 3 is an exploded perspective view of the pants-type disposable diaper shown in FIG. 4 is a cross-sectional view taken along line IV-IV shown in FIG. FIG. 5 is a view showing an absorbent core in the pants-type disposable diaper shown in FIG. 1, wherein (a) is a plan view, (b) is a cross-sectional view along BB shown in (a), and (c) is (a). It is CC sectional drawing shown in FIG. 6A and 6B are diagrams showing the side cuffs in the first embodiment, in which FIG. 6A is a partial plan view, and FIG. 6B is a cross-sectional view taken along line BB shown in FIG. FIG. 7 is a developed plan view of the outer packaging material viewed from the inner surface side of the outer layer sheet with the inner layer sheet virtually removed. FIG. 8 is a developed plan view showing the application position of the adhesive in the outer layer sheet. FIG. 9 is a developed plan view showing the application position of the adhesive in the inner layer sheet. FIG. 10 is an explanatory view showing the iliac bone. FIG. 11 is an explanatory diagram illustrating a method of calculating the slip-off force at the wearer's waist. FIG. 12 is an explanatory diagram showing a method for measuring the length of the superior anterior iliac spine height. FIG. 13 is a plan view showing the composite stretchable part in an expanded state. FIG. 14 is a schematic front view showing the density of wrinkles in a gather composed of composite stretchable parts. FIG. 15 is a perspective view showing the entire contents of one manufacturing method of the pants-type disposable diaper shown in FIG. FIG. 16 is a conceptual diagram centering on the process of forming the composite stretchable part, the non-functionalized region, and the leg elastic member cutting region in the manufacturing method of the pants-type disposable diaper shown in FIG. 15. FIG. 17 is a conceptual diagram centering on the step of forming the composite stretchable part in the method for manufacturing the pants-type disposable diaper shown in FIG. 15. 18A and 18B are partially enlarged views of a longitudinal section of a composite stretchable part in the outer packaging material, where FIG. 18A is a diagram showing an expanded state, and FIG. 18B is a diagram showing a state in which folds are formed and wrinkles are formed. FIG. 19 is a partially enlarged view of another longitudinal section of the composite stretchable part in the outer packaging material. FIG. 19A is a diagram showing an extended state, and FIG. FIG. 20 is a perspective view showing a step of forming a side cuff. FIG. 21 is a conceptual diagram showing a process of joining side cuffs to the absorbent main body. FIG. 22 is a cross-sectional view (corresponding to FIG. 6B) showing a modification of the side cuff in the first embodiment. FIG. 23 is a view (a view corresponding to FIG. 6) showing a side cuff in the second embodiment, wherein (a) is a partial plan view, and (b) is a BB cross-sectional view shown in (a). FIG. 24 is a plan view (corresponding to FIG. 13) showing another form of the composite stretchable part in an expanded state.

Explanation of symbols

1 Pants-type disposable diaper (absorbent article)
DESCRIPTION OF SYMBOLS 11 Side seal part 12 Waist opening part 13 Leg opening part 2 Outer packaging material 2A Width direction center part of outer packaging material 2B Width direction outer side part of outer packaging material 21 Outer layer sheet 21A Non-extension area | region 21B Extension area | region 22 Inner layer sheet | seat 23 Girth circumference elastic member 24 Waist elastic member 25 Leg elastic member 26 Front crotch elastic member 3 Absorbent body 32 Top sheet 33 Back sheet 34 Absorbent core 35 Side cuff 36 Side cuff longitudinal direction elastic member 37 Side cuff forming sheet 38 Side cuff width Direction elastic member 4 Composite elastic part 41 Joint part 42 Composite elastic part forming elastic member 43 ４４ 44 End 45 Composite elastic part upper surface forming sheet 51 Non-functional area 52 Leg elastic member cutting area 61 Nip roll 62 Composite elastic part forming roll 62A Composite Stretchable part forming part 62B Non-functionalized area forming part 62C Leg bullet Member cutting region forming portion 63 Anvil roll 64 Adhesive coating device 65 Swing guide 71 Nip roll 72 Composite stretchable portion forming roll 72A Composite stretchable portion forming portion 72B Non-functionalized region forming portion 73 Anvil roll 74 Adhesive coating device G1 Gather G2 Waist Gather G3 Leg Gather G4 Front Gather Gather 1S Diaper continuum 13S Trim 2S Outer packaging continuum 21S Outer layer continuum 22S Inner layer continuum 3S Absorbent body continuum 35S Side cuff continuum 37S Side cuff forming sheet Continuous body 38S Side cuff width direction elastic member continuum A Abdominal side B Back side C Crotch part D Girth part D1 Upper girth part D2 Lower girth part E Front crotch part F Waist part

Claims (5)

An absorbent article comprising an absorbent main body including an absorbent core, and side cuffs arranged along both sides of the absorbent main body and standing on the skin contact surface side,
The side cuffs include a side cuff forming sheet, a side cuff longitudinal elastic member fixed along the longitudinal direction of the absorbent main body to the side cuff forming sheet in the vicinity of the free end of the side cuff, and the side cuff. A side cuff width direction elastic member arranged along the width direction of the absorbent main body in the vicinity of the free end,
Absorbing property near the free end of the side cuffs from the composite elastic part forming elastic member consisting of the composite elastic part forming sheet facing and the multiple side cuff width direction elastic members arranged between the facing sheets A planar compound stretchable part that stretches in the width direction of the main body is formed,
The composite stretchable part is formed such that the composite stretchable part forming sheets facing each other are joined to each other by intermittent joints in the stretchable direction of the composite stretchable part and the direction orthogonal thereto, so that the composite stretchable part forming elastic member does not pass through the joined part. The composite stretchable part forming elastic member is not fixed to the composite stretchable part forming sheet except for both ends of the composite stretchable part forming elastic member. An absorbent article configured by forming a plurality of ridges extending continuously over.   The absorbent article according to claim 1, wherein the side cuff longitudinal direction elastic members are respectively disposed in the vicinity of both side portions of the composite stretchable portion.   The absorptive article according to claim 1 or 2 in which said composite elastic part formation sheet which counters consists of said side cuff formation sheet and a sheet different from it.   The absorbent article according to claim 1 or 2, wherein the facing composite stretchable part forming sheet is composed of two sheets different from the side cuff forming sheet. The absorbent article further includes an outer packaging material joined to the non-skin-contacting surface side of the absorbent main body, and the outer packaging material is divided into an abdominal side portion, a crotch portion, and a back side portion in the longitudinal direction. A pants-type disposable diaper in which a pair of side seal parts, a waist opening part and a pair of leg opening parts are formed by joining both side edges of the abdomen and back side parts in the material,
The outer packaging material is formed from an outer layer sheet, an inner layer sheet, and a plurality of outer packaging material forming elastic members disposed between both sheets,
A waistline gather and / or a waist gather formed from the composite stretchable part are provided on the waistline part and / or the waist part in the ventral side and the back side part of the outer packaging material, and the composite stretchable part faces each other. The absorbent article according to any one of claims 1 to 4, wherein the composite stretchable part forming sheet is composed of an outer layer sheet and an inner layer sheet, and the composite stretchable part forming elastic member is composed of an outer packaging material forming elastic member.

Images