JP6271413B2 - Disposable diapers - Google Patents

Description

  The present disclosure relates to disposable diapers.

In the disposable diaper, various ideas have been made to achieve good comfort while preventing leakage of excrement.
For example, in FIG. 5 of Patent Document 1, an absorbent core 34 including an hourglass-shaped central absorbent body 34A and a pair of side absorbent bodies 34B and 34B provided symmetrically on both sides of the central absorbent body 34A. Is described. In the absorbent core 34, cut-out portions 34C and 34C each having a hollow shape are formed between the central absorbent body 34A and the pair of side absorbent bodies 34B and 34B.

  According to Patent Document 1, when the absorbent core 34 has the separation portion 34C, both side edges of the absorbent core 34 are easily raised, and when the absorbent core 34 is pressed in the width direction, It is described that since the width of the entire absorbent core 34 becomes narrow, the shrinkage in the width direction of the outer packaging material 2 is difficult to be inhibited.

JP 2008-131968 A

However, since the disposable diaper described in Patent Document 1 bends in the width direction, the disposable diaper described in Patent Document 1 follows the left and right lines of the wearer's body. The design is not made.
Therefore, this indication aims at providing the disposable diaper which follows the solid shape of a wearer's body in a wearing state.

  The present disclosure includes a liquid-permeable layer, a liquid-impermeable layer, and an absorbent layer having one side edge, the other side edge, a longitudinal axis, a front end, and a rear end therebetween, A disposable diaper partitioned into a waist area, a back waist area, and a front crotch area and a back crotch area between the front waist area and the back waist area, wherein the disposable diaper is: A first bending guide line disposed in the front crotch region of the absorbent layer between the longitudinal axis and one side edge and extending in the direction of the longitudinal axis, and between the longitudinal axis and the other side edge And a second bending guide line extending in the direction of the longitudinal axis, and each of the first bending guide line and the second bending guide line is at least a compression part, a groove part, or a slit of the absorption layer. And the disposable diaper is located between the first bending guide line and the second bending guide line. In the region have found the disposable diaper characterized by having a compression section formed by compressing the absorbent layer.

  The disposable diaper of this indication follows a solid shape of a wearer's body in a wearing state.

FIG. 1 is a perspective view of a disposable diaper 1 according to one of the embodiments of the present disclosure. FIG. 2 is a plan view of the disposable diaper 1 shown in FIG. FIG. 3 is a plan view of the absorbent layer 4 of the disposable diaper 1 shown in FIG. 2, the core wrap 4 a covering the absorbent layer 4, and the first elastic member 21 and the second elastic member 22. FIG. 4 is an end view taken along the IV-IV end face of FIG. 5 is an end view taken along the VV end face of FIG. 6 is an end view corresponding to the VV end surface of FIG. 3 of the absorbent layer 4 and the core wrap 4a before the bending guide wire embossed portions 30a and 30b are formed. FIG. 7 is a diagram illustrating a wearing state of the disposable diaper 1 illustrated in FIG. 1. FIG. 8 is a view for explaining a disposable diaper 1 according to another embodiment of the present disclosure. FIG. 9 is a view for explaining a waist region and a crotch region of a tape-type disposable diaper.

[Definition]
Definitions of terms used in this specification will be described.
[Front and rear ends]
In the present specification, “front end” and “rear end” regarding the absorbent layer refer to the wearer as a reference, and the end in the abdomen direction of the absorbent layer and the back end of the absorbent layer, respectively.

[Front body and back body]
In this specification, “front body” and “rear body” are a straight line extending in the width direction of the disposable diaper and the front part and the rear when the disposable diaper is divided into two in the longitudinal direction of the disposable diaper, respectively. It is a side part.

[Body circumference area and crotch area]
In the present specification, “trunk region” and “crotch region” have the following meanings.
(1) Pants-type disposable diaper In the pants-type disposable diaper, the waist area includes a front waist area that exists in the front body and a back waist area that exists in the back body.
The front waist area means an area sandwiched between a pair of joints joining the front body and the back body of the front body, and the back waist area is sandwiched between the pair of joints of the back body. Means the designated area.

  Further, in the pants-type disposable diaper, the crotch region means a region between the front waistline region and the back waistline region, and the front crotch region existing in the front body and the back crotch existing in the back body. It consists of sub-regions. The crotch region corresponds to a region sandwiched between a pair of leg opening portions (reference numeral 64 in FIG. 8).

(2) Tape-type disposable diaper In the tape-type disposable diaper, as shown in FIG. 9, the tape fastener 27 is fixed in a predetermined fixing area 27b for the tape fastener so that the tips 27a of the pair of tape fasteners 27 face each other. In the state, the waist region and the crotch region are partitioned.

  Specifically, the waistline region (FW + RW) is a state where the waistline forming member 61 of the front body F and the waistline forming member 62 of the back body R of the disposable diaper 1 are fixed in the state described above. A determination is made based on a pair of overlapping portions 63 that overlap. The front waistline region FW means a region between the pair of overlapping portions 63 in the front body F of the disposable diaper 1. Similarly, the back waistline region RW means a region between the pair of overlapping portions 63 in the back body R of the disposable diaper 1.

  The crotch region (FC + RC) means a region between the front waistline region FW and the back waistline region RW. The front crotch region FC present in the front body F and the back crotch present in the back body R It consists of partial area RC.

The disposable diaper of the present disclosure will be described in detail below using the drawings as necessary.
1 to 5 and 7 are diagrams for explaining a disposable diaper 1 according to one of the embodiments of the present disclosure (hereinafter, may be referred to as “first embodiment”). Specifically, FIG. 1 shows a disposable diaper 1 according to the first embodiment in a worn state with a first bending guide line, a second bending guide line, a third bending guide line, and a fourth bending guide line. It is a perspective view of the state bent to the wearer side (liquid permeable layer 2 side).

FIG. 2 is a plan view of the disposable diaper 1 shown in FIG. FIG. 3 is a plan view of the absorbent layer 4 of the disposable diaper 1 shown in FIG. 2, the core wrap 4 a covering the absorbent layer 4, and the first elastic member 21 and the second elastic member 22. 4 is an end view at the IV-IV end face of FIG. 2, and FIG. 5 is an end view at the VV end face of FIG. Moreover, FIG. 7 is a figure which shows the wearing condition of the disposable diaper 1 shown by FIG.
In the first embodiment, the disposable diaper 1 includes a pair of three-dimensional gathers 25 including an elastic member 26a, an elastic member 26b, a tape fastener 27, and the like.

  In the first embodiment, the disposable diaper 1 has a liquid permeable layer 2 as a top sheet, a liquid impermeable layer 3 as a back sheet, and absorption between the liquid permeable layer 2 and the liquid impermeable layer 3. Layer 4. The disposable diaper 1 is divided into a front body F and a back body R, and the front body F is further partitioned into a front waist region FW and a front crotch region FC, and the back body R is a back waist region RW. And further divided into a rear crotch region RC. The absorption layer 4 has one side edge 5a, the other side edge 5b, a longitudinal axis LA, a front end FE, and a rear end RE.

  In the first embodiment, the disposable diaper 1 is disposed in the front crotch region FC of the absorbent layer 4 between the longitudinal axis LA and one side edge 5a and extends in the direction of the longitudinal axis LA. 6 and a second bending guide line 7 disposed between the longitudinal axis LA and the other side edge 5b and extending in the direction of the longitudinal axis LA.

  In the first embodiment, the disposable diaper 1 has a compression portion, specifically, in the central region 15 between the first bending guide wire 6 and the second bending guide wire 7 in the front crotch region FC. It has the 1st embossed part 13 and the 2nd embossed part 14 which were formed by compressing the absorption layer 4.

Each of the first embossed portion 13 and the second embossed portion 14 is a linear embossed portion that extends in a direction that is not parallel to or orthogonal to the direction of the longitudinal axis LA line. Moreover, the 1st embossing part 13 and the 2nd embossing part 14 are not parallel.
Since the disposable diaper of the present disclosure has the compression portion in the above-described central region, the rigidity of the absorbent layer in the central region is increased, and the disposable diaper is based on the first folding guide line and the second folding guide line. As described above, the disposable diaper is easily bent in the width direction and on the wearer side.

  The disposable diaper of this indication can have a compression part in the above-mentioned central field without being limited especially if it is between the 1st bending induction line and the 2nd bending induction line. The disposable diaper of the present disclosure preferably has the compression portion in the central region in at least the front crotch region, and more preferably in the front crotch region and the front waistline region. This is because the disposable diaper is easily bent in the width direction and on the wearer side with the first bending guide line and the second bending guide line as a basic axis.

  Moreover, it is preferable that the disposable diaper of this indication has the said compression part in the center area | region of the front end side rather than the 2nd base point of a 1st bending guide line, and the 2nd base point of a 2nd bending guide line. This is because the disposable diaper is easily bent in the width direction and on the wearer side with the first bending guide line and the second bending guide line as a basic axis.

In the disposable diaper of the present disclosure, the rigidity of the absorbent layer in the above-described central region is preferably higher than the rigidity of the absorbent layer in regions other than the central region of the absorbent layer. This is because the disposable diaper is easily bent in the width direction of the disposable diaper and on the wearer side with the first and second bending guide lines as the basic axes.
Examples of the region other than the central region include a region between one side edge of the absorption layer and the first bending guide line, a region between the other side edge of the absorption layer and the second bending guide line, and the like.

In the disposable diaper of the present disclosure, the compression portion, for example, the embossed portion, formed in the above-described central region includes, for example, an absorbent layer; an absorbent layer and a core wrap; an absorbent layer, a core wrap and a liquid permeable layer; It is formed by compressing, for example, embossing a sheet and a liquid permeable layer.
In addition, from a viewpoint of a feeling of wear, it is preferable that the compression part formed in a center area | region is axisymmetric with respect to the longitudinal axis of an absorption layer.

  In the first embodiment, the first bending guide line 6 has a first base point 16a on the front end FE side and a second base point 17a on the rear end RE side, and the second bending guide line 7 is on the front end. It has a first base point 16b on the FE side and a second base point 17b on the rear end RE side.

In the direction D from the front end FE to the rear end RE, the first bending guide line 6 approaches the longitudinal axis LA as it approaches the first base point 16a, and moves away from the first base point 16a to increase the distance from the longitudinal axis LA. Do not change. Further, in the direction D from the front end FE to the rear end RE, the second bending guide line 7 approaches the longitudinal axis LA as it approaches the first base point 16b, and then moves away from the first base point 16b to the longitudinal axis LA. Does not change the distance.
By doing so, the disposable diaper of this indication becomes easy to bend in the longitudinal direction of a disposable diaper and the wearer side in the 1st basic point of the 1st bending guide line, and the 1st basic point of the 2nd bending guide line ( It becomes easier to have a third bending guide line to be described later).

In the direction D from the front end FE to the rear end RE, the first bending guide line 6 approaches the longitudinal axis LA as it approaches the second base point 17a, and moves away from the longitudinal axis LA as it moves away from the second base point 17a. Similarly, in the direction D from the front end FE to the rear end RE, the second bending guide line 7 approaches the longitudinal axis LA as it approaches the second base point 17b, and moves away from the longitudinal axis LA as it moves away from the second base point 17b. .
By doing so, the disposable diaper of this indication becomes easy to bend in the longitudinal direction of a disposable diaper and a wearer side in the 2nd base point of the 1st bending guide line, and the 2nd base point of the 2nd bending guide line ( It becomes easy to have the 4th bending guide line mentioned below).

In the first embodiment, the distance D ₂ between the second base point 17a and the longitudinal axis LA of the first folding guide line 6, the distance between the first base point 16a and the longitudinal axis LA of the first folding guide line 6 D less than _one. Similarly, the distance D ₂ between the second base point 17b and the longitudinal axis LA of the second folding guide line 7 than the distance D ₁ of the between the first base point 16b and the longitudinal axis LA of the second folding guide line 7 Also short.
By doing so, the disposable diaper of this indication becomes easy to follow a wearer's body, especially the solid shape of an inguinal part. This is because the inguinal portion of the wearer becomes narrower from the abdominal side toward the back side.

Distance D ₂ between the second base point 17a and the longitudinal axis LA of the first folding guide line 6 is shorter than the distance D ₃ between the second base point 17a and one side edge 5a, i.e., the second base point 17a Is closer to the longitudinal axis than one side edge 5a. Similarly, the distance D ₂ between the second base point 17b and the longitudinal axis LA of the second folding guide line 7 is shorter than the distance D ₃ between the second base point 17b and the other side edge 5b, i.e., the The two base points 17b are closer to the longitudinal axis than the other side edge 5b.
By doing so, the disposable diaper of this indication becomes easy to follow a wearer's body, especially the solid shape of an inguinal part.

  In 1st Embodiment, the disposable diaper 1 is further equipped with the 3rd bending induction line 8 and the 4th bending induction line 9 which are extended in the width direction W of the disposable diaper 1, and the 3rd bending induction line 8 is 1st. The first bending guide line 6 includes the first base point 16a of the first bending guide line 6 and the first base point 16b of the second bending guide line 7, and the fourth bending guide line 9 is the second base point 17a of the first bending guide line 6. And a second base point 17b of the second bending guide line 7.

  In the disposable diaper of the present disclosure, the third folding guide line includes the first base point of the first bending guide line and the first base point of the second bending guide line, so that the disposable diaper of the present disclosure has the third folding point. It becomes easy to bend in the longitudinal direction of a disposable diaper and a wearer side on the basis of a bending guide line. When the disposable diaper of the present disclosure is bent with the first bending guide line and the second bending guide line as the basic axes, the ease of standing up at both ends in the longitudinal direction of the disposable diaper is the first bending guide line and the second bending guide line. The third bending guide line includes the first base point of the first bending guide line and the first base point of the second bending guide line, although it varies depending on the extending direction of the bending guide line and the elastic member of the disposable diaper. By this, a disposable diaper becomes easy to bend | fold in the state (state with few wrinkles etc.) excellent in the beauty | look in the longitudinal direction and wearer side of a disposable diaper on the basis of the 3rd bending guide line.

  In the disposable diaper of the present disclosure, the fourth folding guide line includes the second base point of the first bending guide line and the second base point of the second bending guide line, so that the disposable diaper of the present disclosure has the fourth folding point. It becomes easy to bend in the longitudinal direction of a disposable diaper and a wearer side on the basis of a bending guide line. The operation is the same as that of the third bending guide line.

  In an embodiment in which the disposable diaper of the present disclosure includes a third folding guide line and a fourth folding guide line, each of the third folding guide line and the fourth folding guide line is an absorbent layer (or disposable diaper). It is preferable to be orthogonal to the longitudinal axis. The wearer's body is basically symmetrical, from the viewpoint of wearing feeling.

  In the first embodiment, the third bending guide line 8 includes a pair of notches 23a and 23b extending from both the one side edge 5a and the other side edge 5b toward the longitudinal axis LA, and the fourth fold. The bending guide line 9 includes a pair of notches 24a and 24b extending from both the one side edge 5a and the other side edge 5b toward the longitudinal axis LA.

  In the disposable diaper of the present disclosure, the third bending guide line and / or the fourth bending guide line includes a pair of cutout portions, whereby the rigidity of the third bending guide line and / or the fourth bending guide line is increased. The longitudinal direction of the disposable diaper is lower than the rigidity of the region other than the bending guide line, that is, the region having no notch, and the disposable diaper is based on the third and fourth bending guide lines. And it becomes easy to bend to the wearer side. In addition, since the disposable diaper of the present disclosure has the cutout portion, the third bending guide line is easily formed by the position including the first base point, and the fourth bending guide line includes the second base point. It becomes easy to form.

In the first embodiment, the disposable diaper 1 is partitioned by the first base point 16a and the second base point 17a of the first bending guide line 6 and the first base point 16b and the second base point 17b of the second bending guide line 7. The groin part which has the groin part contact area | region 10 and the disposable diaper 1 was formed in the wearing state by the groin part contact area | region 10 and the groin part surrounding area | region 11 adjacent to a groin part contact area | region It includes a substantially quadrangular frustum-shaped portion 12 with the contact region 10 as an upper base.
In the first embodiment, the groin portion contact area 10 is surrounded by the first bending guide line 6, the second bending guide line 7, the third bending guide line 8, and the fourth bending guide line 9. It is also an area.

  When the wearer wears the disposable diaper 1, the front crotch region is mainly sandwiched between the wearer's legs, and the disposable diaper 1 is disposable with the first bending guide wire 6 and the second bending guide wire 7 as a base axis. The diaper 1 is bent in the width direction and on the wearer side. Next, when the first bending guide line 6 and the second bending guide line 7 are bent, the disposable diaper 1 is changed to the disposable diaper 1 with the third bending guide line 8 and the fourth bending guide line 9 as a base axis. It bends in the longitudinal direction and on the wearer side. As a result, the disposable diaper 1 is likely to include the substantially quadrangular frustum-shaped portion 12.

In the first embodiment, the first base point 16 a of the first bending guide line 6, the first base point 16 b (third bending guide line 8) of the second bending guide line 7, and the first bending guide line 6 The second base point 17a and the second base point 17b (fourth bending guide line 9) of the second bending guide line 7 are arranged in the front crotch region FC, and the entire groin portion contact region 10 is The front torso region FW and the rear crotch region RC are separated from each other and exist inside the front crotch region FC.
By doing so, the disposable diaper of the present disclosure is likely to include a substantially quadrangular frustum-shaped portion with the groin portion contact region as an upper base in a worn state, and easily follows the three-dimensional shape of the wearer's body. Become.

In 1st Embodiment, in the expansion | deployment state of the disposable diaper 1, the absorption layer 4 has a substantially rectangular shape.
In this technical field, emphasis is placed on the ease of movement of the wearer, and the absorbent layer is formed into an hourglass shape in the deployed state. However, the hourglass type absorbent layer has a small area for receiving liquid. Therefore, there is a risk of leakage. In the disposable diaper of the present disclosure, even if the absorbent layer has a substantially rectangular shape, it can conform to the wearer's body, particularly the three-dimensional shape of the groin, while maintaining the ease of movement of the wearer. Leakage is unlikely to occur.
In the disposable diaper of the present disclosure, the absorbent layer may have an hourglass shape in the deployed state.

  In the first embodiment, the first bending guide line 6 has a curved shape that protrudes from one side edge 5a toward the longitudinal axis LA, and the second bending guide line 7 has the other side edge 5b. And has a curved shape protruding toward the longitudinal axis LA.

  Since the first folding guide line and the second folding guide line have the above-described curved shape, the disposable diaper of the present disclosure is a disposable diaper with the first folding guide line and the second folding guide line as a basic axis. It becomes easy to bend in the longitudinal direction and the wearer side in a state excellent in aesthetic appearance (a state in which there are few wrinkles or the like).

In the disposable diaper of the present disclosure, the first fold guide line and the second fold guide line have a curved shape, so that when the front crotch region is sandwiched between both legs of the wearer, the disposable diaper is guided to the first fold. The wire and the second bending guide line are used as a base axis, and the disposable diaper is bent in the width direction and on the wearer side. Next, when the disposable diaper is bent with the first bending guide line and the second bending guide line as the basic axes, both ends in the longitudinal direction of the disposable diaper are raised, and the disposable diaper can easily follow the three-dimensional shape of the wearer's body. Based on the same principle as a picture book that pops out.
In the present specification, the curved shape is not limited to an arc shape, and the curved shape may have a protruding portion, a hollow portion, or the like.

  In the first embodiment, the start point 6 ′ on the front end FE side of one side edge 5 a of the first bending guide line 6 exists in the front waistline region FW, and the other end of the second bending guide line 7. A starting point 7 'on the front end FE side of the side edge 5b exists in the front waistline region FW.

In the disposable diaper of the present disclosure, among the two intersections of the front end side of the two intersections of the first bending guide line and the one side edge and the two intersections of the second bending guide line and the other side edge When the front end side start point is present in the front waistline region, the disposable diaper is likely to have a three-dimensional shape along the wearer's groin portion (which is likely to have a groin portion contact region described later). .
In the disposable diaper according to another embodiment of the present disclosure, the start point on the front end side of the first folding guide line and the second folding guide line exists in the front crotch region.

  Further, an end point 6 '' on the rear end RE side of one side edge 5a of the first bending guide line 6 exists in the rear crotch region R, and the other side edge of the second bending guide line 7 The end point 7 ″ on the rear end RE side 5b exists in the rear crotch region RC.

By doing so, the disposable diaper of this indication becomes easy to have a solid shape along a wearer's groin part. Specifically, since a force is applied to the rear waist region of the disposable diaper so as to be in close contact with the wearer's waist when worn, the end point on the rear end side of the first folding guide line and the second folding When the end point on the rear end side of the guide wire is present in the rear waist area, the three-dimensional shape along the wearer's inguinal portion is liable to be crushed and it is difficult to maintain the shape. On the other hand, when the said end point exists in a back crotch part area | region, the solid shape along a wearer's groin part will not be crushed, and the fit property to a wearer of a disposable diaper can be improved.
In the disposable diaper according to another embodiment of the present disclosure, the end points on the rear end side of the first bending guide line and the second bending guide line exist in the rear waistline region.

  In the first embodiment, the disposable diaper 1 is arranged in the vicinity of one side edge 5a of the absorbent layer 4 (specifically, inside the one side edge 5a) along the direction of the longitudinal axis LA of the absorbent layer 4. And is disposed in the vicinity of the other side edge 5b of the absorbent layer 4 (specifically, inside the other side edge 5b) along the longitudinal direction L of the absorbent layer 4. A second elastic member 22 is provided.

When the disposable diaper of this indication has the 1st elastic member and the 2nd elastic member, in the wearing state, the disposable diaper becomes easy to bend in the longitudinal direction of a disposable diaper and a wearer side.
In the present specification, the vicinity of the side edge includes coincidence with the side edge and the inside and outside of the side edge.

  In the first embodiment, the end 21 ′ on the front end FE side of the first elastic member 21 is from the first base point 16 a of the first bending guide line 6 (and the first base point 16 b of the second bending guide line 7). Is also disposed on the front end FE side, and the end 22 'on the front end FE side of the second elastic member 22 is the first base point 16b of the second bending guide line 7 (and the first base point of the first bending guide line 6). 16a) is arranged on the front end FE side. Further, the end 21 ″ on the rear end RE side of the first elastic member 21 is behind the second base point 17a of the first bending guide line 6 (and the second base point 17b of the second bending guide line 7). The end 22 ″ on the rear end RE side of the second elastic member 22 is disposed on the end RE side, and the second base point 17b of the second bending guide line 7 (and the second end of the first bending guide line 6). It is arranged closer to the rear end RE than the base point 17a).

By doing so, the disposable diaper is the first base point of the first folding guide line and the first base point of the second bending guide line (for example, the third bending guide line), and the longitudinal direction of the disposable diaper and the wearer The first fold guide line second base point and the second fold guide line second base point (for example, the fourth fold guide line), the longitudinal direction of the disposable diaper and the wearer side It becomes easy to bend.
As the elastic member including the first elastic member and the second elastic member, those known in the art can be used, and examples thereof include polyurethane elastic fibers of about 470 to 940 dtex.

In the first embodiment, the first bending guide wire 6 and the second bending guide wire 7 are compression portions formed by compressing the liquid permeable layer 2 and the absorption layer 4. Specifically, the first bending guide line 6 is formed by intermittently embossing the liquid permeable layer 2 and the absorbent layer 4 along the first bending guide line 6 as a compression part. An embossed portion 30a is provided. Similarly, the second bending guide line 7 is formed by intermittently embossing the liquid permeable layer 2 and the absorption layer 4 along the second bending guide line 7, and an embossed part as a compression part. 30b.
In the first embodiment, the first bending guide wire 6 and the second bending guide wire 7 are also groove portions formed by intermittently embossing the liquid permeable layer 2 and the absorption layer 4.

  In the disposable diaper of the present disclosure, the first bending guide line and the second bending guide line include the compression part and / or the groove part, so that the thickness of the first bending guide line and the second bending guide line is thin. Therefore, the disposable diaper is easily bent in the width direction of the disposable diaper and on the wearer side with the first and second bending guide lines as the basic axes.

  Further, the first bending guide line 6 is a low basis weight region extending along the first bending guide line 6 and having a certain width on the absorbent layer 4, and is more than the average basis weight of the absorbent layer 4. A low basis weight region 28a having a low basis weight is provided. Similarly, the second bending guide line 7 is a low basis weight region that extends along the second bending guide line 7 and has a certain width to the absorbent layer 4, and is based on the average basis weight of the absorbent layer 4. A low basis weight region 28b having a low basis weight.

  In the disposable diaper of the present disclosure, the first fold guide line and / or the second fold guide line has a low basis weight region, so that the disposable diaper has the first fold guide line and / or the second fold guide. It becomes easy to bend | fold in the width direction of a disposable diaper and a wearer side centering on a line.

In embodiments where the disposable diaper of the present disclosure has a low basis weight region, the low basis weight region is preferably 30-90% by weight and more preferably 40-80% by weight of the average basis weight of the absorbent layer. Have quantity. When the ratio is less than 30%, the absorbed liquid tends to be difficult to move beyond the first bending guide line and the second bending guide line, and when the ratio is more than 90%, disposable diapers However, it may become difficult to bend | fold in the width direction of a disposable diaper and a wearer side on the basis of a 1st bending induction line and a 2nd bending induction line.
In addition, it is preferable that the average basic weight of the said absorption layer is 300-700 g / m < ² >.

In 1st Embodiment, the 1st bending induction line 6 is provided with the hollow part 29a formed in the surface of the liquid permeable layer 2 side of the absorption layer 4 in the low basic weight area | region 28a, and 2nd bending induction | guidance | derivation is carried out. The line 7 includes a depression 29b formed on the surface of the absorbent layer 4 on the liquid permeable layer 2 side in the low basis weight region 28b.
By doing so, the disposable diaper of this indication becomes easy to bend in the hollow part side, ie, a wearer side, using the 1st bending induction line and the 2nd bending induction line as a basic axis.

  6 is an end view corresponding to the VV end surface of FIG. 3 of the absorbent layer 4 and the core wrap 4a before the bending guide wire embossed portions 30a and 30b are formed. The absorbent layer 4 shown in FIG. 6 has a low basis weight region 28a that is a depression 29a, and the low basis weight region 28a includes a bottom portion 28aa on which the bending guide wire embossed portion 30a is formed, and both sides thereof. And an inclined portion 28ab. Further, the absorbent layer 4 shown in FIG. 5 has a low basis weight region 28b which is a recess 29b, and the low basis weight region 28b includes a bottom portion 28ba on which the bending guide wire embossed portion 30b is formed, and its bottom portion 28ba. And inclined portions 28bb on both sides.

In the low basis weight regions 28a and 28b, the bottom portions 28aa and 28ba have the smallest basis weight, and in the inclined portions 28ab and 28bb, the basis weight gradually increases as the distance from the bottom portions 28aa and 28ba increases.
The basis weight of the place where the first embossed portion 13 and the second embossed portion 14 are formed is the same as the area around the first embossed portion 13 and the second embossed portion 14.

By forming the low basis weight region, the disposable diaper is easily bent in the width direction of the disposable diaper and on the wearer side with the first and second bending guide lines as the basic axes.
The said low basic weight area | region can be formed in accordance with the method of Unexamined-Japanese-Patent No. 2010-233839 of the same applicant, for example.

  In the first embodiment, the first bending guide line 6 and the second bending guide line 7 are respectively connected to the liquid permeable layer 2 along the first bending guide line 6 and the second bending guide line 7. The core wrap 4a and the embossed portions 30a and 30b formed by intermittently embossing the low basis weight regions 28a and 28b of the absorbent layer 4 should be embossed in the disposable diaper of the present disclosure. It has an embossed part formed by embossing a layer continuously or intermittently. From the viewpoint of making it difficult for the wearer to feel hardness, the embossed portion is preferably formed by intermittently embossing the layer to be embossed.

The layer to be embossed is not particularly limited as long as the first bending guide line and the second bending guide line function as a bending guide line. Absorbing layer; absorbing layer and core wrap; absorbing layer, core wrap And a liquid-permeable layer; an absorbent layer, a core wrap, an auxiliary sheet, a liquid-permeable layer, and the like.
Furthermore, a part of the low basis weight region of the absorbent layer can be embossed and the whole may be embossed.

In an embodiment in which the first bending guide line and the second bending guide line include at least the above-mentioned embossed portion and the above-mentioned low basis weight region in the absorbent layer, the absorbent layer is made of pulp fibers and a superabsorbent material. In addition, the mass ratio of the superabsorbent material in the low basis weight region is preferably lower than the mass ratio of the superabsorbent material in the region other than the low basis weight region in the absorbent layer. By doing so, an embossed part can be formed in the first bending guide line and the second bending guide line without breaking the core wrap and the like, and the first bending guide line and the second bending guide line However, it becomes easy to function as a bending guide line.
Examples of the superabsorbent material include starch, cellulose, and synthetic polymer superabsorbent materials.

The mass ratio of the superabsorbent material is measured as follows.
(1) A predetermined amount of low basis weight sample is cut out from the low basis weight region of the absorbent layer, and the area s ₀ (cm ² ) and mass m ₀ (g) are measured.
(2) A low basis weight sample is put in a 400 mesh nylon bag, immersed in 1000 mL of physiological saline (concentration: 0.9 mass%) for 30 minutes, dehydrated at 150 G (850 rpm) for 2 minutes, and dehydrated. The latter low basis weight sample is taken out from the nylon bag, and its mass m ₁ (g) is measured.
The water absorption A _lb (%) is _expressed by the following formula:
A _lb (%) = 100 × (m ₁ −m ₀ ) / s ₁
Calculated by

(3) A predetermined amount of sample is cut out from the region other than the low basis weight region of the absorbent layer, and the water absorption rate A _nb (%) is calculated in the same manner as the low basis weight sample.
(4) If water absorption rate A _lb (%) <water absorption rate A _nb (%), the mass ratio of the high absorbent material in the low basis weight region is high absorption in the region other than the low basis weight region in the absorbent layer. It is judged that it is lower than the mass ratio of the functional material.
The measurement is performed at 20 ° C.

  The disposable diaper of the present disclosure is not limited to the above-described embodiment, and in the disposable diaper according to another embodiment of the present disclosure, in principle, by reducing the fiber density of the absorbent layer, the height of the absorbent layer is kept constant, A basis weight region can be formed. In the disposable diaper according to another embodiment of the present disclosure, the first folding guide line and the second folding guide line extend to the absorption layer along the first folding guide line and the second folding guide line, respectively. And having a low basis weight region having a certain width, and in the low basis weight region, the absorbent layer has a fiber density lower than the average fiber density of the absorbent layer, and as a rule, the height of the absorbent layer is constant. However, it has a lower basis weight than the average basis weight of the absorbent layer. The first bending guide line and the second bending guide line can also be the bending guide lines by reducing the fiber density of the absorbent layer.

In the embodiment shown in FIGS. 1 to 5, the low basis weight regions 28 a and 28 b have groove-shaped depressions 29 a and 29 b formed on the surface of the absorbent layer 4 on the liquid permeable layer 2 side, respectively. However, in the disposable diaper of this indication, a hollow part is not limited to a groove-shaped thing.
FIG. 8 is a view for explaining a disposable diaper according to another embodiment of the present disclosure, which corresponds to an end view of the VV end face of FIG. 3 but before the bending guide wire embossing portion is formed. FIG.

The absorption layer 4 shown in FIG. 8 includes an absorption layer 4 ′ between the first bending guide line 6 and the second bending guide line 7, and an absorption layer 4 ″ outside the first bending guide line 6. , The first folding guide line 6 and the second folding guide line 7 are respectively the first folding guide line 6 and the second bending guide line 7. The slit portions 31 a and 31 b of the absorption layer 4 extending along the bending guide line 7 are provided. The slit portion 31a is defined by the absorption layer 4 ′ and the absorption layer 4 ″, and the slit portion 31b is defined by the absorption layer 4 ′ and the absorption layer 4 ′ ″.
By doing so, in the disposable diaper of this indication, it becomes easy to bend in the width direction of a disposable diaper and the wearer side on the basis of the 1st bending induction line and the 2nd bending induction line.

  In an embodiment in which the disposable diaper of the present disclosure includes an absorbent layer and a core wrap, and the first folding guide line and / or the second folding guide line includes a slit part, in the slit part, one surface of the absorbent layer It is preferable that the core wrap and the core wrap on the other surface of the absorbent layer are joined (joining of the core wraps). Even when the wearer moves, the spacing between the absorbent layers adjacent to the slit portion is kept constant, and the first bending guide line and / or the second bending guide line can continue to function. It is.

  For joining core wraps, hot melt adhesives such as synthetic rubber (SIS, SBS, SEPS, SEBS), EVA, polyolefin (PE, PP) hot melt adhesives, embossed core wraps are used. Examples include heat fusion.

  It is preferable that the bonding of the core wrap is maintained even when wet. This is because even when the disposable diaper absorbs liquid such as urine, the first bending guide line and / or the second bending guide line can continue to function.

Bonding between core wraps when wet can be evaluated as follows.
(1) Measurement of liquid absorption capacity (i) A sample (absorption layer and core wrap) is taken out from the disposable diaper to be evaluated, and its mass: M ₀ (g) is measured. When removing the absorbent layer, the elastic member is removed as much as possible.
(Ii) Put the sample in a 400-mesh nylon bag, soak it in 1000 mL of physiological saline (concentration: 0.9 mass%) for 30 minutes, and then place the sample so that the skin side of the sample faces the outside of the centrifuge. Set and dehydrate at 150 G (850 rpm) for 2 minutes.
(Iii) Mass of sample taken out from nylon bag: M ₁ (g) is measured.
(Iv) The liquid absorption capacity of the sample is expressed by the following formula:
Liquid absorption capacity (g) = M ₁ (g) −M ₀ (g)
Calculated by

(2) Confirmation of bonding between core wraps after liquid absorption (i) A sample (absorbing layer and core wrap) is taken out from the disposable diaper to be evaluated.
(Ii) Put a physiological saline solution (concentration: 0.9% by mass) of 70% of the liquid absorption capacity in a tray slightly larger than the sample, and place the sample in the physiological saline on the tray. Soak side down.
(Iii) After leaving for 5 minutes, a sample is taken out and it is confirmed whether or not the core wraps are joined to each other in the slit portion.
In addition, the said measurement is implemented at 20 degreeC.
In the disposable diaper of the present disclosure, it is preferable that the core wraps are joined to each other in the slit portion after the measurement.

  In the first embodiment, the disposable diaper 1 includes a pair of three-dimensional gathers 25 on both sides in the longitudinal direction L of the disposable diaper 1. Each of the pair of three-dimensional gathers 25 has a free end 25a close to the longitudinal axis of the disposable diaper 1 and a fixed end 25b farther from the longitudinal axis LA of the disposable diaper 1 than the free end 25a. The fixed end 25 b is fixed to the liquid permeable layer 2. The free end 25a has elasticity in the longitudinal direction L of the disposable diaper 1 by including the elastic member 26a, and the free end 25a is a top at both ends of the disposable diaper 1 in the longitudinal direction L via the fixing portions 32. It is fixed to the sheet 2.

In 1st Embodiment, in the expansion | deployment state of the disposable diaper 1, the inguinal part contact area | region 10 does not overlap with a pair of solid gathers 25 and the thickness direction of the disposable diaper 1. FIG.
By doing so, in the disposable diaper of this indication, an inguinal part contact field becomes easy to keep the shape, and a disposable diaper becomes easy to follow a three-dimensional shape of a wearer's body in a wearing state.

  Moreover, in the disposable diaper of this indication, it is preferable that a 1st bending induction line and a 2nd bending induction line are axisymmetric with respect to the longitudinal axis of an absorption layer. The wearer's body is basically symmetrical, from the viewpoint of wearing feeling.

  In the disposable diaper of the present disclosure, it is preferable that each of the first bending guide line and the second bending guide line does not intersect with the longitudinal axis of the absorbent layer. The first base point and the second base point of the first bending guide line, and the groin portion contact region formed by the first base point and the second base point of the second bending guide line (the disposable diaper of the present disclosure is the third fold) In the embodiment including the bent guide line and the fourth bent guide line, the inguinal portion formed by the first bent guide line, the second bent guide line, the third bent guide line, and the fourth bent guide line. This is because the contact region is formed on the longitudinal axis of the absorption layer.

In the disposable diaper of the present disclosure, one or both of the first bending guide line and the second bending guide line may further include an additional base point between the first base point and the second base point. Since the disposable diaper has a new bending guide line for bending the disposable diaper in the longitudinal direction and the wearer side between the third bending guide line and the fourth bending guide line, the disposable diaper However, in a wearing state, it is easier to have a shape along the three-dimensional shape of the wearer's body.
As the additional base point, in the direction from the front end to the rear end, the distance from the longitudinal axis is not changed as the additional base point is approached, or the distance from the longitudinal axis is not changed, and as the distance from the additional base point is approached, the longitudinal axis is approached. Things.

  As shown in the first embodiment, the disposable diaper of the present disclosure, in the wearing state, the first base point and the second base point of the first bending guide line, and the first base point and the second base point of the second bending guide line. A substantially rectangular inguinal portion contact area defined by a base point (a substantially rectangular shape surrounded by a first bending guide line, a second bending guide line, a third bending guide line, and a fourth bending guide line) It is preferable to include a substantially quadrangular frustum-shaped portion with the groin portion contact region as an upper base, by the (groin portion contact region) and the groin portion surrounding region adjacent to the groin portion contact region. This is because, in the wearing state, it can conform to the three-dimensional shape of the wearer's body, specifically the shape of the groin. Moreover, when a disposable diaper follows the shape of an inguinal part, urination can be received in a wider area and the leakage of urination decreases.

  The disposable diaper of the present disclosure can be manufactured by combining methods known in the art. For example, the absorption layer of 1st Embodiment can be manufactured according to the method as described in Unexamined-Japanese-Patent No. 2010-233839 of the same applicant.

DESCRIPTION OF SYMBOLS 1 Disposable diaper 2 Liquid permeable layer 3 Liquid impermeable layer 4 Absorbing layer 4a Core wrap 5a One side edge 5b The other side edge 6 1st bending induction line 7 2nd bending induction line 8 3rd bending induction line 9 Inclining part contact area 11 Inguinal part surrounding area 12 Shaped part of substantially quadrangular pyramid 13 First embossed part 14 Second embossed part 15 Central area 16 First base point 17 Second base point 21 First Elastic member 22 Second elastic member 23, 24 Notch 25 Solid gather 26 Elastic member 27 Tape fastener 28 Low basis weight area 29 Recessed portion 30 Embossed portion for bending guide wire 31 Slit portion F Front body R Rear body FW Front waist Area FC Front crotch area RW Rear waist area RC Rear crotch area LA Longitudinal axis

Claims (11)

A liquid-permeable layer, a liquid-impermeable layer, and an absorbent layer having one side edge, the other side edge, a longitudinal axis, a front end, and a rear end therebetween, a front waistline region, and a rear A disposable diaper partitioned into a waist area and a front crotch area and a back crotch area between the front waist area and the back waist area,
The disposable diaper is disposed between the longitudinal axis and one side edge in the back crotch region, the front crotch region, and the front waistline region of the absorbent layer, and extends in the direction of the longitudinal axis. A first bending guide line and a second bending guide line disposed between the longitudinal axis and the other side edge and extending in the direction of the longitudinal axis;
Each of the first bending guide line and the second bending guide line is at least a compression part, a groove part or a slit part of the absorbent layer, and the disposable diaper is in the front crotch region and the front waistline region , in the central region between the first folding guide line and the second folding guide line, it has a compression section formed by compressing the absorbent layer,
It, and
Each of the first bending guide line and the second bending guide line has a curved shape protruding from the one side edge and the other side edge toward the longitudinal axis, and in the front crotch region And a first base point on the front end side and a second base point on the rear end side, and each of the first bending guide line and the second bending guide line is in a direction from the front end toward the rear end. As the first base point is approached, the longitudinal axis is approached, and as the distance from the first base point is not changed, the distance from the longitudinal axis is not changed, or the distance from the longitudinal axis is not changed, and the first folding guide line and the second folding guide line In the direction from the front end to the rear end, the distance from the longitudinal axis does not change or the distance from the longitudinal axis does not change as it approaches the second base point, and from the longitudinal axis as it moves away from the second base point. Distant Hunt,
The said disposable diaper characterized by the above-mentioned.   The disposable diaper of Claim 1 in which the compression part of the said center area | region contains the embossing part formed by embossing the said absorption layer.   The disposable diaper according to claim 2, wherein the embossed portion is a linear embossed portion that extends in one or more directions that are not parallel to or perpendicular to the direction of the longitudinal axis. The second base points of the first folding guide line and the second folding guide line have a distance from the longitudinal axis that is shorter than the first base point of the first folding guide line and the second folding guide line, respectively. The disposable diaper according to claim 1 . The second base point of the first folding guide line and the second folding guide line, respectively, shorter than the distance between the side edges and the other side edge of said one, with the distance between the longitudinal axis claim 1 the disposable diaper according to any one of to 4. The disposable diaper further includes a third bending guide line and a fourth bending guide line extending in the width direction of the disposable diaper, and the third bending guide line includes the first folding guide line and the second folding line. includes a first base point of the guiding line, the fourth folding guide line comprises a second base point of the first folding guide line and the second folding guide line, according to any one of claims 1 to 5 Disposable diapers. At least one of the third folding guide line and the fourth folding guide line includes a pair of cutouts extending from said both one side edge and the other side edge toward said longitudinal axis, according to claim 6 Disposable diapers. The disposable diaper has a first base point and a second base point of the first bending guide line, and an inguinal portion contact region defined by the first base point and the second base point of the second bending guide line, and the disposable diaper When the diaper is in a worn state, the diaper is formed of the groin portion contact region and the groin portion surrounding region adjacent to the groin portion contact region. The disposable diaper as described in any one of Claims 1-7 containing a shape part. The first folding guide line and the second folding guide line, respectively, side edges and the other side edge of said one, the start point of the front end is present in the front waist region, claims 1-8 The disposable diaper as described in any one of . The first folding guide line and the second folding guide line, respectively, side edges and the other side edge of said one end point of the rear end side is present in the rear crotch region, according to claim 1 or 9. The disposable diaper according to 9 . The disposable diaper, the near one side edge and near the other side edge of each, arranged along the direction of the longitudinal axis, comprising a first elastic member and the second elastic member, according to claim 1-10 The disposable diaper as described in any one of.

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