JP2023075941A - absorbent article - Google Patents

Abstract

To provide an absorbent article capable of inhibiting excrement such as feces from adhering to the skin.SOLUTION: An absorbent article 1 includes a surface sheet 2 and an absorber 4, has a longitudinal direction X and a transverse direction Y, and includes a belly side part A, a crotch part C, and a back side part B along the longitudinal direction X. The surface sheet 2 includes an uneven structure. The absorber 4 has an upper layer absorber 41 and a lower layer absorber 43, each of the upper layer absorber 41 and the lower layer absorber 43 including an absorbent core. When the thickness of the upper layer absorber 41, the thickness of the lower layer absorber 43, and the thickness of the surface sheet 2 in a state that the absorbent article 1 is developed and placed under no pressure are represented as T1, T2, and T3 respectively, the conditions of (1) and (2) are preferably satisfied at least in the crotch part C. T1>T2...(1) and T3>T2...(2)SELECTED DRAWING: Figure 4

Description

The present invention relates to absorbent articles.

Absorbent articles such as disposable diapers are provided with a topsheet that comes into contact with the wearer's skin and an absorbent body that is the main liquid absorbing part. Absorbent articles are required to have sufficient absorption performance to prevent leakage of excrement to the outside, and to be thin and soft, and to be comfortable to wear. From such a point of view, the present applicant previously proposed a first layer having a large number of protrusions protruding to the surface side and having cavities therein and recesses located between the protrusions, and a planarly formed layer. proposed an absorbent article comprising a surface sheet comprising a second layer and an absorbent body containing a superabsorbent polymer having a liquid permeation rate of 60 ml / min or more under a pressure of 2.0 kPa (Patent Reference 1).

JP 2009-153631 A

Reducing the thickness of the absorbent body is effective in improving wearing comfort, but tends to reduce the ability to retain excrement in the absorbent article. In particular, in order to stably retain stool, which is more viscous than urine, it has been common to employ a bulky absorbent. However, when an absorbent article having a bulky absorbent body is worn, the gap between the skin and the absorbent article becomes narrow, and excrement such as stool may adhere to the skin and contaminate the skin. The above-mentioned patent documents do not disclose a technique for preventing excrement such as stool from adhering to the skin.

Accordingly, the present invention relates to providing an absorbent article capable of suppressing adhesion of excrement such as stool to the skin.

The present invention comprises a surface sheet and an absorbent body, has a longitudinal direction corresponding to the front-rear direction of the wearer and a lateral direction orthogonal to the longitudinal direction, and has an abdominal part, a crotch part and a back part along the longitudinal direction. An absorbent article with sides.
It is preferable that the surface sheet has an uneven structure.
Preferably, the absorbent body has an upper absorbent body and a lower absorbent body, and each of the upper absorbent body and the lower absorbent body includes an absorbent core.
In a state in which the absorbent article is unfolded and placed under no pressure, at least the crotch portion, where T1 is the thickness of the upper absorbent body, T2 is the thickness of the lower absorbent body, and T3 is the thickness of the topsheet, WHEREIN: It is preferable to satisfy the following conditions (1) and (2).
T1>T2 (1)
T3>T2 (2)

According to the absorbent article of the present invention, it is possible to suppress adhesion of excrement such as stool to the skin.

FIG. 1 is an unfolded plan view schematically showing the skin facing surface side (inner surface side) in an unfolded and stretched state, which is an embodiment of the absorbent article of the present invention. 2 is a cross-sectional view along the lateral direction of the crotch portion of the absorbent article shown in FIG. 1. FIG. 3 is an enlarged cross-sectional view of the absorbent main body shown in FIG. 2. FIG. 4 is a longitudinal sectional view of the absorbent article shown in FIG. 1. FIG. FIG. 5 is a developed plan view showing the arrangement of the absorbent body shown in FIG. 4 in the absorbent article. FIG. 6 is a view corresponding to FIG. 4 showing another embodiment of the upper absorbent body according to the present invention. 7 is a plan view of the absorbent body shown in FIG. 6 on the side facing the skin. FIG. FIG. 8 is a plan view showing still another embodiment of the upper absorbent body according to the present invention. FIG. 9 is a view equivalent to FIG. 4 showing still another embodiment of the upper absorbent body according to the present invention. FIG. 10 is a plan view of the absorbent body shown in FIG. 9 on the side facing the skin. 1 is a drawing-substituting image showing an embodiment of a concave-convex sheet that is preferably used as a surface sheet according to the present invention, and is an image photographed from the first surface Z1 side. FIG. 12(A) is a partial cross-sectional view corresponding to the AA line portion of FIG. 11, and FIG. 12(B) is the unevenness shown in FIG. 11 when the height of the horizontal ridges is uniform between the vertical ridges. 4 is a partial cross-sectional view corresponding to the AA line portion of the seat; FIG. FIG. 12 is a partial cross-sectional view taken along line BB of FIG. 11; 12 is a partial cross-sectional view taken along line CC of FIG. 11; FIG. FIG. 12 is a partial cross-sectional view taken along line DD of FIG. 11; 12 is an image taken from the side of the second surface Z2 of the concave-convex sheet shown in FIG. 11; FIG. 17 is a partial cross-sectional view taken along line EE of FIG. 16; 17 is a partial cross-sectional view taken along line FF of FIG. 16; FIG. FIG. 17 is a partial cross-sectional view taken along line GG of FIG. 16; 17 is a partial cross-sectional view taken along line HH of FIG. 16; FIG. FIG. 12 is a diagram schematically showing an example of a preferred method of manufacturing the uneven sheet shown in FIG. 11; 21(A) is a top view showing the female support member, FIG. 21(B) is a top view showing the male support member, and FIG. 21(C) is a fiber web arranged on the male support member. and FIG. 11 is a cross-sectional view showing a step of pushing the female support member into the male support member from above the fiber web. FIG. 22(A) is a top view showing a state in which the male member of the support is inserted into the female member of the support (however, illustration of the web is omitted), and FIG. 22(B) is a sectional view of the above state. FIG. 4 is a cross-sectional view showing a step of removing the female support material and blowing hot air from above the formed fiber web to fuse the fibers. FIG. 24 is a cross-sectional view showing another embodiment of the topsheet according to the present invention.

Hereinafter, the absorbent article of the present invention will be described based on its preferred embodiments. 1 to 5 show a spreadable disposable diaper (hereinafter also simply referred to as "diaper") which is one embodiment of the absorbent article of the present invention. FIG. 1 shows the configuration of the diaper 1 viewed from the side facing the skin. The diaper 1 shown in FIG. It has a longitudinal direction X extending from the side to the dorsal side through the crotch portion and a lateral direction Y perpendicular to the longitudinal direction X. The diaper 1 has an abdominal portion A and a dorsal portion B arranged on the wearer's abdomen and a crotch portion C positioned between the abdomen portion A and the dorsal portion B when the diaper 1 is worn. Prepare. The abdominal portion A, the crotch portion C, and the back portion B are regions obtained by dividing the entire length of the diaper 1 in the longitudinal direction X into three equal parts, and extend continuously in the front-rear direction of the wearer. The crotch part C has an excretion part facing part (not shown) that is arranged to face the wearer's excretion part when the diaper 1 is worn.
As shown in FIG. 1, the diaper 1 extends in the vertical direction X and is symmetrical with respect to a vertical center line CL that bisects the diaper 1 in the horizontal direction Y. As shown in FIG.

In this specification, the "unfolded and stretched state" of the diaper 1 means that the diaper 1 is in the unfolded state, and the elastic members of each part of the diaper 1 in the unfolded state are stretched to the design dimensions (the influence of the elastic members is completely eliminated). It is the same as the dimension when it is spread flat in the state).
In addition, when focusing on the diaper or its constituent members (for example, an absorbent body), the "skin-facing surface" is the surface facing the wearer's skin when the diaper is worn, and the "non-skin-facing surface" is the diaper. This is the side facing away from the wearer's skin when worn. That is, the skin-facing surface is the surface relatively close to the wearer's skin, and the non-skin-facing surface is the surface relatively far from the wearer's skin. "During wearing" and "wearing state" refer to a state in which the diaper is worn while maintaining a proper position.

As shown in FIGS. 1 and 2, the diaper 1 includes a liquid-permeable topsheet 2 forming a skin-facing surface and a backsheet 3 forming a non-skin-facing surface. The backsheet 3 of this embodiment is a liquid-impermeable or water-repellent sheet.
An absorbent body 4 is arranged between the topsheet 2 and the backsheet 3 , and the topsheet 2 , the backsheet 3 , and the absorbent body 4 constitute an absorbent body 5 . Each of the top sheet 2 and the back sheet 3 has a dimension larger than that of the absorbent body 4 and extends outward from the outer peripheral edge of the absorbent body 4 . The top sheet 2 and the back sheet 3 extend outward in the lateral direction Y from both side edges along the longitudinal direction X of the absorbent body 4, as shown in FIG. Both longitudinal edges of the top sheet 2 and the back sheet 3 in this embodiment substantially match the longitudinal X edges of the diaper 1 .

The surface sheet 2 has an uneven structure. More specifically, the surface sheet 2 has a plurality of convex portions and a plurality of concave portions formed on the surface. The surface sheet 2 of the present embodiment has an uneven structure in the region overlapping the absorbent body 4, and convex portions and concave portions located between the convex portions are formed on the skin-facing side. Alternatively, the surface sheet 2 may have an uneven structure over its entire area.
The surface sheet 2 may have an uneven structure on the skin-facing surface and a flat non-skin-facing surface, or conversely, the skin-facing surface may be flat and the non-skin-facing surface may have an uneven structure. may be

The surface sheet 2 of this embodiment has an uneven shape on both the skin-facing side and the non-skin facing side, and the uneven shape on the skin-facing side corresponds to the uneven shape on the non-skin facing side. (See Figures 2 and 3). That is, the topsheet 2 of the present embodiment has a first surface (skin-facing surface) and a second surface (non-skin-facing surface). The second surface has an uneven shape corresponding to the first surface. In this case, the protrusions protruding on the first surface side (skin-facing surface side) of the topsheet 2 correspond to the recesses on the second surface side (non-skin-facing surface side) on the back side, and the second surface side (non-skin-facing surface side) On the back side, the protrusions protruding toward the skin-facing surface side) correspond to the recesses on the first surface side (skin-facing surface side).

From the viewpoint of further improving feces retention, which will be described later, the uneven structure of the surface sheet 2 preferably has a height of 1.5 mm or more, more preferably 2 mm, on the skin-facing side or the non-skin-facing side. .5 mm or more, more preferably 3.0 mm or more, preferably 5.0 mm or less, more preferably 4.5 mm or less, and preferably 1.5 mm or more and 5.0 mm or less, more preferably 2.5 mm 5.0 mm or more, more preferably 3.0 mm or more and 4.5 mm or less.
The height of the convex portion is the height from the top of the convex portion to the concave portion in the thickness direction Z of the surface sheet 2 . When convex portions having different heights are formed on the surface sheet 2, the height of the highest convex portion is preferably within the range described above.
Details of the concave-convex structure of the surface sheet 2 will be described later.

The diaper 1 of this embodiment further comprises an exterior nonwoven fabric 3a arranged on the non-skin facing side of the backsheet 3 (see FIG. 2). The exterior nonwoven fabric 3a forms the non-skin facing surface of the diaper 1. As shown in FIG. The outer nonwoven fabric 3a forms the outer shape of the diaper 1 in the unfolded and stretched state, and the peripheral edges of the outer nonwoven fabric 3a form the outlines of the abdominal portion A, the crotch portion C, and the back portion B, respectively.

In the diaper 1 of the present embodiment, as shown in FIG. 1, a pair of leak-proof cuffs 6, 6 are provided so as to overlap both sides of the absorber 4 along the longitudinal direction X. As shown in FIG. The leak-proof cuff 6 is composed of a water-repellent and air-permeable cuff-forming sheet 60 . One or more filamentous cuff-forming elastic members 61 are arranged in the longitudinal direction X in the vicinity of the free end of each leak-proof cuff 6 . The leakage-preventing cuff 6 stands up at least at the crotch portion C by contracting the cuff-forming elastic member 61 arranged in a stretched state when the diaper 1 is put on. prevent it from flowing out.

The exterior nonwoven fabric 3a extends outward in the lateral direction Y from both side edges along the longitudinal direction X of the absorbent body 4, and forms the side flap portion SF together with the cuff forming sheet 60 constituting the leak-proof cuff 6. there is The side flap portions SF are portions made of members extending outward in the lateral direction Y from both side edges along the longitudinal direction X of the absorber 4 . The side flap portion SF is composed of at least the cuff forming sheet 60 and the exterior nonwoven fabric 3a, and includes sheets extending outward in the lateral direction Y from both side edges along the longitudinal direction X of the absorbent body 4. . The side flap portion SF of the present embodiment includes a cuff forming sheet 60, a top sheet 2, a back sheet 3, and an exterior nonwoven fabric 3a.
The side flap portions SF continue from the abdominal portion A to the dorsal portion B via the crotch portion C and extend outward in the horizontal direction Y from both side edges of the absorbent body 4 . The sheets forming the side flap portions SF are joined to each other at the portions extending from the side edges of the absorber 4 by known joining means such as adhesive, heat sealing, and ultrasonic sealing.

In the diaper 1 of the present embodiment, as shown in FIG. 1, elastic members 63 (hereinafter referred to as "leg ) is arranged in a stretched state so as to extend in the longitudinal direction X through the crotch portion C. As shown in FIG. Due to the contraction of the leg elastic members 63, leg gathers are formed on the left and right portions around the legs of the wearer, that is, on both sides in the longitudinal direction X of the diaper 1. As shown in FIG. In this embodiment, the leg elastic members 63 are fixed in a stretched state along the longitudinal direction X between the cuff forming sheet 60 and the outer nonwoven fabric 3a in the side flap portions SF.

The diaper 1 of this embodiment has a waist flap portion WF extending outward in the longitudinal direction X from the edge of the absorber 4 in the longitudinal direction X at the back portion B. As shown in FIG. The waist flap portion WF is a portion made of a member that extends outward in the longitudinal direction X from the edge of the absorber 4 in the longitudinal direction X. As shown in FIG. In this embodiment, the waist flap portion WF is composed of a cuff-forming sheet 60 extending outward in the longitudinal direction X from the edge of the absorber 4, a top sheet 2, a back sheet 3, and an exterior nonwoven fabric 3a. These sheets are bonded to each other at the extending portions from the edge of the absorbent body 4 by known bonding means such as adhesive, heat sealing, ultrasonic sealing, and the like. The waist flap portion WF corresponds to the circumference of the wearer's waist when the diaper 1 is worn.
An elastic member extending in the lateral direction Y may be arranged in the waist flap portion WF in a stretched state so that the waist gathers are formed by contraction of the elastic member.

The diaper 1 of this embodiment is provided with a pair of fastening members positioned at both side edges along the longitudinal direction X of the back side portion B and extending in the lateral direction Y from the both side edges. Such fastening members are composed of side panels 7 extending outward in the lateral direction Y from both side edges of the side flap portions SF in the dorsal portion B, and further laterally from the leading end portion of the side panel 7 in the extending direction. and a fastening tape 8 fixed so as to extend outward in the Y direction.

The side panel 7 includes two rectangular panel members in plan view and a plurality of elastic members fixed in a stretched state between the panel members and extending in the horizontal direction Y ( not shown). A plurality of elastic members provided in the side panel 7 are arranged at predetermined intervals in the vertical direction X to form a stretchable portion that can be stretched in the horizontal direction Y, which is the extension direction of the elastic members. That is, the side panel 7 has elasticity in the horizontal direction Y. As shown in FIG. In the side panel 7, the side edge on the inner side in the lateral direction Y is bonded between the sheets forming the side flap portion SF (for example, between the cuff forming sheet 60 and the exterior nonwoven fabric 3a) by a known bonding agent such as an adhesive. fixed by means.

The fastening tape 8 includes a tape base material and a fastening portion, and the tape base material forms the outer shape of the fastening tape 8 . The fastening portion of the fastening tape 8 is arranged on the skin-facing surface of the tape substrate. By detachably attaching such a tape base material to a fixing area described later, the fastening tape 8 can be detachably attached to the fixing area. The fastening tape 8 has a rectangular shape in plan view, and the inner side edge in the horizontal direction Y is fixed to the non-skin-facing surface of the tip of the side panel 7 by a known bonding means such as an adhesive.

The abdominal portion A of the diaper 1 is provided with a fastening region (not shown) to which the fastening portion of the fastening tape 8 can be detachably fastened. An appropriate material for the fastening region is selected according to the material of the fastening portion of the fastening tape 8 . For example, when the fastening portion is the male member of a mechanical fastener, the fastening region can be made of a fiber sheet that can be engaged with the male member, such as a knitted fabric or a non-woven fabric, as the female member of the mechanical fastener. . Further, when the fastening part is an adhesive, for example, a smooth synthetic resin film can be used as the fastening region. In this embodiment, the exterior nonwoven fabric 3a forming the non-skin-facing surface of the abdominal portion A of the diaper 1 serves as a fastening region.

In the diaper 1 of the present embodiment, a pair of abdominal flaps 67 extending outward in the lateral direction Y are provided on both side edges along the longitudinal direction X of the side flap portions SF in the abdominal portion A. It has 67. The ventral flap 67 is made of a non-stretchable sheet material, and like the side panel 7, the side edge portion inward in the lateral direction Y extends between the sheets forming the side flap portion SF (for example, the cuff forming sheet 60). and the exterior nonwoven fabric 3a) by a known joining means such as an adhesive.
When the diaper 1 having the abdominal flaps 67 is put on, the diaper 1 is passed below the crotch of the wearer, and one hand holds one of the abdominal flaps 67 and the other hand holds the diaper 1. By gripping the back side portion B, the diaper 1 can be easily pulled up toward the wearer (the crotch portion), and each portion of the diaper can be easily applied around the waist and the crotch portion of the wearer. .

The diaper 1 includes a liquid-retentive absorbent body 4, as shown in FIGS. The absorber 4 shown in the figure has a substantially rectangular shape, and is arranged so that its longitudinal direction is aligned with the longitudinal direction X of the diaper. As shown in FIG. 1, the absorber 4 of the present embodiment is continuous from the abdominal portion A to the dorsal portion B via the crotch portion C. As shown in FIG. Specifically, both the upper layer absorbent body 41 and the lower layer absorbent body 43, which will be described later, are continuous from the abdomen portion A to the back portion B via the crotch portion C. As shown in FIG.
The absorber 4 in this embodiment has both side edges extending in the longitudinal direction X in a straight line. Alternatively, the absorbent body 4 may have a portion constricted in the lateral direction Y at the crotch portion C. As shown in FIG. In this case, both longitudinal edges of the absorbent body 4 are located inward of the longitudinal edges of the diaper 1 .

The absorbent body 4 has an upper absorbent body 41 and a lower absorbent body 43 . In the thickness direction Z of the diaper 1 , the upper absorbent core 41 is arranged closer to the skin-facing side than the lower absorbent core 43 . The absorbent body 4 of this embodiment has a two-layer structure consisting of an upper absorbent body 41 and a lower absorbent body 43 .
Each of the upper layer absorbent body 41 and the lower layer absorbent body 43 includes an absorbent core having absorbent performance. The absorbent core is the main liquid-absorbing portion of the diaper 1, and is composed of a water-absorbing material such as pulp or water-absorbing polymer.
Each of the upper absorbent body 41 and the lower absorbent body 43 may be formed by covering the absorbent core with a liquid-permeable core wrap sheet, or may not include the core wrap sheet. In addition, the absorbent body 4 may be configured such that the upper absorbent body 41 includes an absorbent core and a core wrap sheet covering it, and the lower absorbent body 43 consists of only the absorbent core. The body 41 may be composed only of the absorbent core, and the lower absorbent body 43 may be composed of the absorbent core and a core wrap sheet covering the absorbent core.

The diaper 1 satisfies the following conditions (1) and (2) at least at the crotch portion C when the diaper 1 is unfolded and placed under no pressure. "Unfolding the diaper 1" means that the diaper 1 is put into an unfolded and stretched state as shown in FIG.
T1>T2 (1)
T3>T2 (2)
T1: Thickness of upper absorbent core 41 T2: Thickness of lower absorbent core 43 T3: Thickness of topsheet 2 In the following description, thickness T1 of upper absorbent core 41, thickness T2 of lower absorbent core 43, and thickness of topsheet 2 Unless otherwise specified, each of T3 and the relationship between the thicknesses means the thickness when the diaper 1 is unfolded and placed under no pressure, and the relationship between the thicknesses.

[Method for measuring thickness]
Each thickness of the upper layer absorbent body 41, the lower layer absorbent body 43 and the surface sheet 2 in the diaper 1 is measured by the following method.
First, the diaper 1 is unfolded and stretched, and the diaper 1 is cut along the lateral direction Y at the position of the crotch portion C. As shown in FIG. Then, the cut diaper 1 is placed so that the side facing the skin faces upward, and the cut surface of the diaper 1 is magnified and observed under no load using a microscope (digital microscope VHX-1000 manufactured by Keyence Corporation). Then, the thicknesses of the upper absorbent core 41, the lower absorbent core 43 and the surface sheet 2 are measured on the cut surface. The measurement is performed at arbitrary five points on the cut surface, and the average value of these numerical values is used as the thickness of the upper absorbent core 41, the lower absorbent core 43, or the topsheet 2. FIG. Moreover, the thickness T3 of the surface sheet 2 is measured at a portion where the convex portions of the concave-convex structure are not crushed. In addition, when fluffing affects the thickness, it is preferable to measure under a low load of 0.05 kPa in order to suppress the influence. A laser displacement meter may be used instead of image observation.

The thickness T1 (see FIG. 3) of the upper layer absorbent body 41 is the thickness of the upper layer absorbent body 41 as a whole. That is, when the upper layer absorbent body 41 includes a core wrap sheet, the thickness of the upper layer absorbent body 41 depends on the thickness of the absorbent core included in the upper layer absorbent body 41, the skin facing surface side and the non-skin facing surface side of the absorbent core. It is the total thickness with the core wrap sheet.
The thickness T2 (see FIG. 3) of the lower absorbent body 43 is the thickness of the entire lower absorbent body 43. As shown in FIG. That is, when the lower absorbent body 43 includes a core wrap sheet, the thickness of the lower absorbent body 43 is determined by the thickness of the absorbent core included in the lower absorbent body 43, the skin facing surface side and the non-skin facing surface side of the absorbent core. It is the total thickness with the core wrap sheet.
When the absorbent body 4 comprises a laminate consisting of upper and lower two layers of absorbent cores, and the skin-facing surface and the non-skin-facing surface of the laminate are each covered with a core wrap sheet, the skin of the laminate is The core wrap sheet on the facing surface side and the upper absorbent core are referred to as an upper absorbent body 41 , and the core wrap sheet and lower absorbent core on the non-skin facing side of the laminate are referred to as a lower absorbent core 43 . In this case, the thickness of the upper absorbent body 41 is the total thickness of the absorbent core (upper absorbent core) in the upper absorbent body 41 and the core wrap sheet on the side facing the skin of the absorbent core. The thickness of 43 is the total thickness of the absorbent core (lower absorbent core) in the lower absorbent body 43 and the core wrap sheet on the non-skin facing side of the absorbent core.

In the example shown in FIG. 3, the core wrap sheet covering the non-skin facing surface of the upper absorbent core and the core wrap sheet covering the skin facing surface of the lower absorbent core are in direct contact. A liquid-permeable intermediate sheet (not shown) may be interposed between both core wrap sheets. In that case, the thickness T1 of the upper absorbent body 41 is the thickness including the thickness of the intermediate sheet. Specifically, the thickness of the upper layer absorbent body 41 and the thickness of the intermediate sheet are measured according to the [Method for measuring thickness] described above, and the total value of the two measured values is defined as the thickness T1 of the upper layer absorbent body 41 .
Examples of the intermediate sheet include fibrous sheets composed of single-layer or multi-layer nonwoven fabrics, paper, laminates thereof, and the like. The intermediate sheet may be a mesh sheet, woven fabric, or the like.

The thickness T3 (see FIG. 3) of the topsheet 2 is the maximum thickness of the topsheet 2 . For example, in the topsheet 2 of the present embodiment, the distance between the apex of the protrusions protruding toward the skin-facing side and the apex of the protrusions protruding toward the non-skin-facing side in the thickness direction Z is thickness.
Between the topsheet 2 and the absorbent body 4, for example, between the topsheet 2 and the upper absorbent body 41, a second sheet (not shown) made of nonwoven fabric or paper, also called a sublayer sheet, may be arranged. . When another liquid-permeable sheet such as a second sheet is arranged between the topsheet 2 and the absorbent body 4, the thickness T3 of the topsheet 2 is the thickness including the thickness of the other sheet. do. Specifically, the thickness of the top sheet and the thickness of the other sheet are measured according to the [Method for measuring thickness] described above, and the sum of the measured values is taken as the thickness T3 of the top sheet.

The diaper 1 of this embodiment satisfies the conditions (1) and (2) at least in the crotch portion C when the diaper 1 is unfolded and placed under no pressure, so the gap between the skin and the diaper 1 is satisfied. can be easily secured. This means that the thickness T2 of the lower absorbent body 43 is made smaller than the thickness T1 of the upper absorbent body 41, and the thickness T2 of the lower absorbent body 43 is made smaller than the thickness T3 of the topsheet 2 (T1>T2, T3> T2) makes it possible to effectively prevent the thickness of the entire absorbent body 4 from becoming too large, that is, the absorbent body 4 from being excessively bulky. Moreover, the absorber 4 satisfying the condition (1) above has a multi-layered structure composed of the upper absorber 41 and the lower absorber 43, and the surface sheet 2 satisfying the above (2) has an uneven structure. Therefore, highly viscous excrement can be easily retained inside the surface sheet 2 (for example, inside the recesses of the uneven structure) or inside the upper absorbent body 41 . As a result, it is possible to effectively prevent excrement excreted in the diaper 1 from adhering to the skin.
In addition, the diaper 1 of the present embodiment can reduce the bulkiness of the absorber 4 and reduce the thickness of the entire diaper 1 as described above, so that a good feeling of wearing can be obtained.

Conditions (1) and (2) above and conditions (3) and (4) described later are based on the basis weight of the pulp in the absorbent cores of the upper layer absorbent body 41 and the lower layer absorbent body 43, and the surface sheet. can be satisfied by adjusting the basis weight of 2 and the uneven structure of the surface sheet 2 .

From the viewpoint of ensuring the effects described above, the diaper 1 preferably satisfies the following condition (3) at least at the crotch portion C when the diaper 1 is unfolded and placed under no pressure.
T3>T1 (3)
That is, it is preferable that the following magnitude relationship (I) that satisfies all the conditions (1) to (3) is established. As a result, the bulkiness of the absorbent body 4 can be further suppressed, and the gap between the skin and the diaper 1 can be secured more reliably.
T3>T1>T2 (I)

The conditions (1) to (3) and the magnitude relationship (I) described in detail below are the upper absorbent body 41, the lower absorbent body 43, and the surface sheet in the state where the diaper 1 is unfolded and placed under no pressure. 2 each thickness.

From the viewpoint of achieving both suppression of the bulkiness of the absorbent body 4 and retention of excrement, when the size relationship (I) is satisfied at least in the crotch part C, the upper layer absorbent body 41, the lower layer absorbent body 43, and the topsheet 2 are combined. Each thickness is preferably within the following range.
The ratio (T3/T1) of the thickness T3 (see FIG. 3) of the topsheet 2 to the thickness T1 (see FIG. 3) of the upper absorbent body 41 is preferably 1.05 or more, more preferably 1.10 or more. , preferably 1.50 or less, more preferably 1.40 or less, more preferably 1.05 or more and 1.50 or less, more preferably 1.10 or more and 1.40 or less.
The ratio (T1/T2) of the thickness T1 (see FIG. 3) of the upper absorbent body 41 to the thickness T2 (see FIG. 3) of the lower absorbent body 43 is preferably 1.50 or more, more preferably 2.00 or more. , preferably 4.50 or less, more preferably 4.00 or less, preferably 1.50 or more and 4.50 or less, more preferably 2.00 or more and 4.00 or less.

The thickness T3 (see FIG. 3) of the surface sheet 2 is preferably 2.5 mm or more, more preferably 3.0 mm or more, and preferably 5.0 mm or less, more preferably 4.5 mm or less. is 2.5 mm or more and 5.0 mm or less, more preferably 3.0 mm or more and 4.5 mm or less.
The thickness T1 (see FIG. 3) of the upper absorbent core 41 is preferably 2.0 mm or more, more preferably 2.5 mm or more, and preferably 4.5 mm or less, more preferably 4.0 mm or less, and It is preferably 2.0 mm or more and 4.5 mm or less, more preferably 2.5 mm or more and 4.0 mm or less.
The thickness T2 (see FIG. 3) of the lower absorbent body 43 is preferably 0.5 mm or more, more preferably 1.0 mm or more, and preferably 3.0 mm or less, more preferably 2.5 mm or less, and It is preferably 0.5 mm or more and 3.0 mm or less, more preferably 1.0 mm or more and 2.5 mm or less.

In addition, from the viewpoint of improving the absorption performance of the absorbent body and further suppressing the bulkiness of the diaper 1 as a whole, the diaper 1 has the following characteristics at least in the crotch part C when the diaper 1 is unfolded and placed under no pressure. It is preferable to satisfy the condition (4).
T1>T3 (4)
That is, it is preferable that the following magnitude relationship (II) that satisfies all the conditions (1), (2) and (4) is established. As a result, the bulkiness of the diaper 1 as a whole can be suppressed, and a gap between the skin and the diaper 1 can be ensured more reliably while improving the absorption performance.
T1>T3>T2 (II)
The above conditions (1), (2) and (4) and the size relationship (II) are respectively the upper layer absorbent body 41, the lower layer absorbent body 43, and the surface sheet in the state where the diaper 1 is unfolded and placed under no pressure. 2 each thickness.

From the viewpoint of achieving both suppression of bulkiness and absorption performance of the diaper 1 as a whole, when the size relationship (II) is satisfied at least in the crotch portion C, each thickness of the upper absorbent core 41, the lower absorbent core 43, and the topsheet 2 is It is preferably within the following range.
The ratio (T3/T1) of the thickness T3 (see FIG. 3) of the topsheet 2 to the thickness T1 (see FIG. 3) of the upper absorbent body 41 is preferably 0.30 or more, more preferably 0.50 or more, and It is preferably 0.70 or more, preferably 0.95 or less, more preferably 0.90 or less, and preferably 0.30 or more and 0.95 or less, more preferably 0.50 or more and 0.95 or less. , more preferably 0.70 or more and 0.90 or less.
The ratio (T1/T2) of the thickness T1 (see FIG. 3) of the upper absorbent body 41 to the thickness T2 (see FIG. 3) of the lower absorbent body 43 is preferably 2.50 or more, more preferably 3.00 or more. , preferably 4.50 or less, more preferably 4.00 or less, more preferably 2.50 or more and 4.50 or less, more preferably 3.00 or more and 4.00 or less.

When the size relationship (II) is satisfied at least in the crotch portion C, each thickness is preferably within the following range.
The thickness T3 (see FIG. 3) of the surface sheet 2 is preferably 1.5 mm or more, more preferably 2.5 mm or more, and preferably 4.5 mm or less, more preferably 4.0 mm or less. is 1.5 mm or more and 4.5 mm or less, more preferably 2.5 mm or more and 4.0 mm or less.
The thickness T1 (see FIG. 3) of the upper absorbent core 41 is preferably 3.0 mm or more, more preferably 3.5 mm or more, and preferably 5.0 mm or less, more preferably 4.8 mm or less, and It is preferably 3.0 mm or more and 5.0 mm or less, more preferably 3.5 mm or more and 4.8 mm or less.
The thickness T2 (see FIG. 3) of the lower absorbent core 43 is preferably 0.5 mm or more, more preferably 1.0 mm or more, and preferably 2.0 mm or less, more preferably 1.5 mm or less, and It is preferably 0.5 mm or more and 2.0 mm or less, more preferably 1.0 mm or more and 1.5 mm or less.

The diaper 1 preferably satisfies the above conditions (1) and (2) at the crotch portion C, and the conditions (1) to (3), that is, the size relationship (I), or the above (1), (2) and (4), that is, the magnitude relationship (II) is more preferably satisfied. Further, the diaper 1 may satisfy the above conditions (1) and (2) in one or both of the abdominal portion A and the dorsal portion B.

The diaper 1 of this embodiment includes the side panels 7 extending outward in the lateral direction Y from both side edges of the dorsal portion B as described above. In the diaper 1, the upper layer absorbent body 41 and the lower layer absorbent body 43 are positioned at the position of the dorsal horizontal center line BL (see FIGS. 4 and 5) that bisects the side panel 7 in the vertical direction X and extends in the horizontal direction Y. both are provided.
The diaper 1 preferably satisfies the above condition (2) (T3>T2) at the position of the dorsal lateral center line BL in the longitudinal direction X. With such a configuration, the stretchability of the side panel 7 can further improve the retention of feces in the absorbent body 4 of the back side portion B and the wearing comfort of the back side portion B. As shown in FIG.
From the viewpoint of achieving the same effect as above, it is preferable that the position of the dorsal lateral center line BL in the longitudinal direction X satisfy the condition (3) (T3>T1), and that the magnitude relationship (I) is satisfied. (T3>T1>T2) is more preferable.

The diaper 1 of this embodiment includes the abdomen flaps 67 extending outward in the lateral direction Y from both side edges of the abdomen portion A as described above. In the diaper 1, the upper layer absorbent body 41 and the lower layer absorbent body 43 are positioned at the position of the abdominal lateral center line AL (see FIGS. 4 and 5) extending in the lateral direction Y by bisected the abdominal flap 67 in the longitudinal direction X. are provided.
The diaper 1 preferably satisfies the above condition (2) (T3>T2) at the position of the ventral lateral center line AL in the longitudinal direction X. With such a configuration, the retention of excrement in the absorber 4 of the ventral portion A can be further improved.
From the viewpoint of achieving the same effects as above, it is preferable that the position of the ventral lateral center line AL in the longitudinal direction X satisfy the condition (1) (T1>T2).

In the ventral part A, the absorber 4 mainly absorbs and retains urine. From the viewpoint of further improving the retention of urine in the abdominal portion A, the condition (4) is satisfied at the position of the abdominal lateral center line AL in the longitudinal direction X when the diaper 1 is unfolded and placed under no pressure. is preferred. That is, it is preferable that the thickness T1 of the upper absorbent core 41 is larger than the thickness T3 of the topsheet 2 .
T1>T3 (4)

When condition (4) above is satisfied at the position of the ventral lateral center line AL in the longitudinal direction X, the thicknesses of the upper absorbent core 41 and the topsheet 2 are preferably within the following ranges.
At the position of the ventral lateral center line AL in the longitudinal direction X, the ratio (T3/T1) of the thickness T3 (see FIG. 3) of the topsheet 2 to the thickness T1 (see FIG. 3) of the upper absorbent core 41 is preferably 0.70 or more, more preferably 0.75 or more, preferably 0.95 or less, more preferably 0.90 or less, and preferably 0.70 or more and 0.95 or less, more preferably 0.95 or less. It is 75 or more and 0.90 or less.
At the position of the ventral lateral center line AL in the longitudinal direction X, the thickness T3 (see FIG. 3) of the topsheet 2 is preferably 2.3 mm or more, more preferably 2.8 mm or more, and preferably 4.8 mm or less. , more preferably 4.3 mm or less, more preferably 2.3 mm or more and 4.8 mm or less, more preferably 2.8 mm or more and 4.3 mm or less.
At the position of the ventral lateral center line AL in the longitudinal direction X, the thickness T1 (see FIG. 3) of the upper absorbent core 41 is preferably 3.0 mm or more, more preferably 3.5 mm or more, and preferably 6.0 mm. Below, it is more preferably 5.5 mm or less, more preferably 3.0 mm or more and 6.0 mm or less, and more preferably 3.5 mm or more and 5.5 mm or less.

If the conditions (1) and (2) and the magnitude relationship (I) are satisfied in the crotch portion C, and the condition (4) is satisfied at the position of the ventral lateral center line AL in the longitudinal direction X, the crotch portion It is preferable that the thickness T1 of the upper absorbent core 41 is different between C and the position of the ventral lateral center line AL in the longitudinal direction X, or the thickness T3 of the topsheet 2 is different.
For example, in a diaper, the thickness T1 of the upper absorbent body 41 is different between the crotch portion C and the back portion B and the abdominal portion A, and the thickness T1 in the abdominal portion A is different from the crotch portion C and the back portion. When the thickness is larger than the thickness T1 in B (not shown), the position of the ventral lateral center line AL in the longitudinal direction X satisfies the condition (4).

From the viewpoint of more easily satisfying the above condition (1) and further improving the retention of feces, it is preferable that the absorbent core of the upper absorbent body 41 is composed of pulp and a water absorbent polymer. . For example, the absorbent core in the upper absorbent body 41 is preferably a mixed fiber stack containing a water absorbent polymer and pulp. In this case, the upper absorbent body 41 preferably comprises a core wrap sheet covering the surface of the absorbent core made of the mixed laminated body.

Plant-derived pulp, recycled pulp, or the like can be used as the pulp constituting the absorbent core. Examples of plant-derived pulp include wood pulp such as softwood pulp and hardwood pulp, cotton pulp such as cotton linter and cotton lint, and non-wood pulp such as straw pulp and bagasse pulp. As the pulp, it is preferable to use defibrated fluff pulp.

The water-absorbent polymer that constitutes the absorbent core can be selected from various hydrogel materials such as cross-linked polymers or copolymers of acrylic acid or alkali metal acrylate salts, polyacrylic acid and its salts, and polyacrylate graft polymers. Cross-linked products of coalescence, cross-linked products of starch or carboxymethylated cellulose, cross-linked products of hydrolysis products of starch-acrylate graft copolymers, cross-linked products of vinyl alcohol-acrylate copolymers, maleic anhydride grafts Composed of a crosslinked product of polyvinyl alcohol, a crosslinked isobutylene-maleic anhydride copolymer, a saponified product of a vinyl acetate-acrylic acid ester copolymer, etc., and these components may be used alone or in combination of two or more. can be done. Examples of the shape of the particles of the water-absorbent polymer include spherical, massive, bale-shaped, and irregular shapes.

From the viewpoint of easily reducing the thickness of the lower absorbent core 43 and further improving the retention of urine in the absorbent core 4, the absorbent core of the lower absorbent core 43 is preferably composed mainly of a water-absorbing polymer. preferable. The phrase “mainly composed of a water-absorbing polymer” means that the content of the water-absorbing polymer in the absorbent core is more than 50% by mass and 100% by mass or less.
In this case, for example, the absorbent core in the lower absorbent body 43 is preferably a polymer sheet having a structure in which a water absorbent polymer is held between two sheets. Moreover, it is preferably a laminate of a core wrap sheet and a water-absorbent polymer deposit, or a laminate of a core wrap sheet and a dried mixture containing a water-absorbent polymer. The dried mixed product is obtained, for example, by drying a mixed liquid containing a water-absorbent polymer and a water-soluble polymer.

From the viewpoint of more easily satisfying the above condition (1) and further improving fecal retention, the upper absorbent core 41 preferably has a higher basis weight of the pulp constituting the absorbent core than the lower absorbent core 43. preferable. In the diaper 1, it is preferable that at least the crotch part C, and more preferably the back part B, the crotch part C and the abdominal part A satisfy the basis weight of the pulp of the absorbent core.
The above-mentioned "basis weight of pulp constituting the absorbent core" does not include the basis weight of pulp sheets such as non-woven fabrics and mounts.

Hereinafter, the basis weight of the pulp constituting the absorbent core in the upper absorbent body 41 is also referred to as "upper core pulp basis weight", and the basis weight of the pulp constituting the absorbent core in the lower absorbent body 43 is also referred to as "lower layer core pulp basis weight". say. From the viewpoint of more easily satisfying the above condition (1) and further improving the retention of stool, the basis weight of the upper core pulp and the basis weight of the lower core pulp are preferably within the following ranges.
When the absorbent core in the lower absorbent body 43 contains pulp, the ratio of the upper layer core pulp basis weight to the lower layer core pulp basis weight (upper layer core pulp basis weight/lower layer core pulp basis weight) is preferably 3 or more, more preferably 5 or more. , preferably 15 or less, more preferably 12 or less, more preferably 3 or more and 15 or less, more preferably 5 or more and 12 or less.
The basis weight of the upper core pulp is preferably 70 g/m ² or more, more preferably 80 g/m ² or more, and preferably 170 g/m ² or less, more preferably 160 g/m ² or less, and preferably 70 g/m 2 or less. m ² or more and 170 g/m ² or less, more preferably 80 g/m ² or more and 160 g/m ² or less.
The basis weight of the lower core pulp is preferably 0 g/m ² or more, more preferably 10 g/m ² or more, preferably 200 g/m ² or less, more preferably 80 g/m ² or less, and preferably 0 g/m 2 or less. m ² or more and 100 g/m ² or less, more preferably 10 g/m ² or more and 80 g/m ² or less.

From the viewpoint of absorbing and retaining more water contained in feces, it is preferable that the upper absorbent core 41 has a higher basis weight of the absorbent polymer constituting the absorbent core than the lower absorbent core 43 . In the diaper 1, the basis weight of the absorbent polymer of the absorbent core is preferably satisfied at least in the crotch portion C, and more preferably in the back portion B, the crotch portion C and the abdominal portion A. .

Hereinafter, the basis weight of the water absorbent polymer constituting the absorbent core in the upper absorbent body 41 is also referred to as "upper layer core SAP basis weight", and the basis weight of the water absorbent polymer constituting the absorbent core in the lower absorbent body 43 is referred to as "lower layer Also referred to as "core SAP basis weight". From the viewpoint of more easily satisfying the above condition (1) and further improving the retention of stool, the upper layer core SAP basis weight and the lower layer core SAP basis weight are preferably within the following ranges.
The ratio of the lower core SAP basis weight to the upper core SAP basis weight (lower core SAP basis weight/upper core SAP basis weight) is preferably 0.4 or more, more preferably 0.5 or more, and preferably 0.5. It is 9 or less, more preferably 0.8 or less, preferably 0.4 or more and 0.9 or less, more preferably 0.5 or more and 0.8 or less.
The upper core SAP basis weight is preferably 100 g/m ² or more, more preferably 120 g/m ² or more, preferably 300 g/m ² or less, more preferably 280 g/m ² or less, and preferably 100 g /m ² or more and 300 g/m ² or less, more preferably 120 g/m ² or more and 280 g/m ² or less.
The lower core SAP basis weight is preferably 80 g/m ² or more, more preferably 100 g/m ² or more, preferably 200 g/m ² or less, more preferably 180 g/m ² or less, and preferably 80 g /m ² or more and 200 g/m ² or less, more preferably 100 g/m ² or more and 180 g/m ² or less.

[Method for measuring each basis weight of pulp or water-absorbing polymer constituting absorbent core]
The upper layer absorbent body 41 and the lower layer absorbent body 43 are taken out from the absorbent body, the absorbent core is further taken out, and the mass of the absorbent core is measured. Next, the absorbent polymer and fibrous material (pulp) of each absorbent core are separated, and the respective masses of the absorbent polymer and fibrous material are measured. For the separation of the water-absorbing polymer and the fibrous material, various methods capable of almost completely separating the water-absorbing polymer and the fibrous material can be used without particular limitation. For example, using the difference in particle size, it may be sieved with a fine mesh, and using the difference in mass, the pulp is placed under an air flow that scatters only the pulp, and the mass before and after scattering is measured. good too. In addition, each absorbent core is immersed in an ascorbic acid solution and exposed to sunlight to dissolve the water-absorbing polymer, and the remaining fiber mass after washing is determined, and the mass of the remaining fiber after washing is calculated from the weight of the cut absorbent core. can be calculated by subtracting JIS L 1030-1 (Part 1 Fiber Identification), JIS L 1030-2 (Part 1 Fiber Identification), JIS L 1030-2 ( Part 2: Mixing rate test method for textile products) can be used as appropriate.

Next, another embodiment of the absorbent article according to the present invention will be described. In the following, another embodiment will be described mainly with respect to components that are different from those of the embodiment shown in FIGS. The description of the embodiment shown in FIGS. 1 to 5 is appropriately applied to components that are not particularly described.

The basis weight of the absorbent core in the upper layer absorbent body 41 may be the same throughout the upper layer absorbent body 41 or may be partially different.
The upper absorbent body 41a shown in FIGS. 6 and 7 is continuous from the abdominal part A to the back part B via the crotch part C, and the basis weight of the absorbent core is the same as the abdominal part A and the crotch part C. , the dorsal part B is different. Specifically, the basis weight differs near the boundary between the back side portion B and the crotch portion C, and the basis weight of the absorbent core in the upper layer absorbent body 41 is higher in the abdominal side portion A than in the back side portion B. expensive. The upper absorbent body 41a shown in FIGS. 6 and 7 has a high basis weight region 46a located in the ventral portion A and the crotch portion C, and a low basis weight region 46b located in the back portion B. The basis weight of the absorbent core in the high basis weight regions 46a is higher than the basis weight of the absorbent core in the low basis weight regions 46b. With such a configuration, it is possible to further improve the absorbency of urine on the abdominal portion A side, and more reliably secure a gap between the skin and the diaper 1 on the dorsal portion B side.

From the viewpoint of further improving the above effect, the basis weight of the absorbent core in each of the high basis weight region 46a and the low basis weight region 46b is preferably within the following ranges.
The ratio of the basis weight of the absorbent core in the high basis weight regions 46a to the basis weight of the absorbent core in the low basis weight regions 46b (basis weight of the absorbent core in the high basis weight regions 46a/absorbent in the low basis weight regions 46b The basis weight of the core) is preferably 1.1 or more, more preferably 1.2 or more, preferably 2.0 or less, more preferably 1.8 or less, and preferably 1.1 or more. 0.0 or less, more preferably 1.2 or more and 1.8 or less.
The basis weight of the absorbent core in the high basis weight region 46a is preferably 180 g/m ² or more, more preferably 200 g/m ² or more, preferably 500 g/m ² or less, more preferably 450 g/m ² or less. It is preferably 180 g/m ² or more and 500 g/m ² or less, more preferably 200 g/m ² or more and 450 g/m ² or less.
The basis weight of the absorbent core in the low basis weight region 46b is preferably 100 g/m ² or more, more preferably 120 g/m ² or more, preferably 400 g/m ² or less, more preferably 350 g/m ² or less. It is preferably 100 g/m ² or more and 400 g/m ² or less, more preferably 120 g/m ² or more and 350 g/m ² or less.

The upper absorbent core 41 may have the same area in the abdominal part A, the crotch part C, and the back part B in plan view, or may have different areas.
The upper absorbent core 41b shown in FIG. 8 is continuous from the abdominal portion A to the dorsal portion B via the crotch portion C, and the abdominal portion A and the dorsal portion B have different areas. Specifically, the width (the length in the lateral direction Y) of the upper absorbent core 41b differs near the boundary between the dorsal portion B and the crotch portion C, and the ventral portion A The width (the length in the horizontal direction Y) of the upper layer absorbent body 41b is long, and due to this, the area of the upper layer absorbent body 41b is larger in the abdominal side portion A than in the dorsal side portion B. With such a configuration, it is possible to further improve the absorbency of urine on the abdominal portion A side, and more reliably secure a gap between the skin and the diaper 1 on the dorsal portion B side.

From the viewpoint of further improving the above effect, it is preferable that the area of the upper absorbent core 41b in each of the ventral portion A and the dorsal portion B is within the following ranges.
Ratio of the area of the upper absorbent core 41b in the ventral part A to the area of the upper absorbent core 41b in the dorsal part B (area of the upper absorbent core 41b in the ventral part A/area of the upper absorbent core 41b in the dorsal part B ) is preferably 1.1 or more, more preferably 1.2 or more, preferably 1.8 or less, more preferably 1.6 or less, and preferably 1.1 or more and 1.8 or less, It is more preferably 1.2 or more and 1.6 or less.
The area of the upper absorbent core 41b in the ventral part A is preferably 10000 mm ² or more, more preferably 12000 mm ² or more, preferably 18000 mm ² or less, more preferably 16000 mm ^{2 or} less, and more preferably 10000 mm ² or more. 18000 mm ² or less, more preferably 12000 mm ² or more and 16000 mm ² or less.
The area of the upper absorbent core 41b in the dorsal portion B is preferably 6000 mm ² or more, more preferably 7000 mm ² or more, preferably 12000 mm ² or less, more preferably 11000 mm ² or less, and more preferably 6000 mm ² or more. 12000 mm ² or less, more preferably 7000 mm ² or more and 11000 mm ² or less.

In the absorbent body 4 of the embodiment shown in FIGS. 1 to 5 described above, both the upper layer absorbent body 41 and the lower layer absorbent body 43 are continuous from the abdominal portion A to the dorsal portion B via the crotch portion C. there were. Alternatively, the upper absorbent core 41 or the lower absorbent core 43 may not extend to the end regions in the longitudinal direction X of the dorsal portion B or the abdominal portion A.
In the absorbent body 4 shown in FIGS. 9 and 10, the lower absorbent body 43 is continuous from the abdominal part A to the dorsal part B via the crotch part C. As shown in FIG. On the other hand, the upper absorbent core 41c extends from the abdominal portion A to the crotch portion C in the longitudinal direction X, but does not reach the dorsal portion B. As shown in FIG. In other words, the lower absorbent core 43 of the present embodiment extends in the longitudinal direction X toward the dorsal portion B from the upper absorbent core 41c. With such a configuration, the gap between the skin and the diaper 1 can be secured more reliably on the back side portion B side.
From the viewpoint of obtaining the same effects as above, it is preferable that the upper absorbent core 41c does not extend to the dorsal lateral center line BL.

In the case where the lower absorbent core 43 extends in the longitudinal direction X toward the dorsal side portion B than the upper absorbent core 41c, the length of the upper absorbent core 41c in the longitudinal direction X is The ratio (L1/L3) of L1 (see FIG. 10) to the length L3 (see FIG. 10) of the lower absorbent core 43 in the longitudinal direction X is preferably 0.60 or more, more preferably 0.70 or more. , preferably 0.95 or less, more preferably 0.90 or less, more preferably 0.60 or more and 0.95 or less, more preferably 0.70 or more and 0.90 or less.
The length L1 (see FIG. 10) of the upper absorbent body 41c in the longitudinal direction X is preferably 270 mm or more, more preferably 300 mm or more, and preferably 430 mm or less, more preferably 400 mm or less, and preferably 270 mm. 430 mm or less, more preferably 300 mm or more and 400 mm or less.
The length L3 (see FIG. 10) of the lower absorbent core 43 in the longitudinal direction X is preferably 300 mm or more, more preferably 330 mm or more, and preferably 450 mm or less, more preferably 420 mm or less, and preferably 300 mm. 450 mm or less, more preferably 330 mm or more and 420 mm or less.

The material forming each part of the diaper in the embodiment described above will be described in detail. As the topsheet 2, the backsheet 3 and the absorbent body 4, those conventionally used in absorbent articles can be used without particular limitation.
As the surface sheet 2, for example, a liquid-permeable nonwoven fabric or the like can be used. From the viewpoint of easily providing the uneven structure, the surface sheet 2 is preferably a nonwoven fabric containing thermoplastic fibers. Examples of thermoplastic fiber constituent resins (thermoplastic resins) include polyolefins such as polyethylene and polypropylene; polyesters such as polyethylene terephthalate; polyamides such as nylon 6 and nylon 66; polyacrylic acid, polymethacrylic acid alkyl esters, polyvinyl chloride , polyvinylidene chloride, etc., and these can be used alone or in combination of two or more. Further, the thermoplastic fiber may be a composite fiber such as a core-sheath type or a side-by-side type. The conjugate fiber may be configured including a plurality of resin components.

As the back sheet 3, a liquid impermeable resin film, a laminate of a resin film and a nonwoven fabric, or the like can be used.
The absorber 4 can use, as an absorbent core, an aggregate of hydrophilic fibers such as wood pulp and hydrophilized synthetic fibers, or an aggregate holding a water-absorbent polymer. As the cuff-forming sheet 60, a water-repellent nonwoven fabric can be used.
When the upper absorbent body 41 or the lower absorbent body 43 is provided with a core wrap sheet, various papers and non-woven fabrics can be used as the core wrap sheet.

For the exterior nonwoven fabric 3a, for example, nonwoven fabrics produced by various manufacturing methods can be used. A spunbond (SMS) nonwoven fabric) or the like can be used. The exterior nonwoven fabric 3a may be composed of a single sheet as shown in FIG. 2, or alternatively may be composed of a laminate of a plurality of sheets.

The elastic members provided in the diaper 1, specifically, the elastic members such as the cuff-forming elastic member 61 and the leg elastic member 63, are made of various known elastic materials that are commonly used in this type of absorbent article without any particular limitations. be able to. Examples of elastic materials include synthetic rubbers such as styrene-butadiene, butadiene, isoprene and neoprene, natural rubbers, EVA, elastic polyolefins, and polyurethanes. As for the shape of the elastic member, it is preferable to use a thread-like (string rubber, etc.) or string-like (flat rubber, etc.) having a rectangular, square, circular, polygonal cross section, etc., or a multi-filament type thread-like one. can.
The elastic member provided in the side panel 7 can also be made of the elastic material described above.

Next, the concave-convex sheet 10 having a concave-convex structure, which is preferably used for the topsheet 2 according to the present invention, will be described based on preferred embodiments thereof.
The concave-convex sheet 10 shown in FIGS. 11 and 16 is a nonwoven fabric having a concave-convex structure, and has front and back surfaces of a first surface Z1 and a second surface Z2 opposite to the first surface Z1. When the first surface Z1 of the concave-convex sheet 10 is viewed in plan, the first surface Z1 side has a plurality of vertical ribs 11 projecting in the thickness direction of the concave-convex sheet 10 and space between the vertical ribs 11, 11. A plurality of horizontal ridges 21 arranged in a continuous manner are formed. The vertical ridges 11 extend in one direction (hereinafter also referred to as “Y1 direction”) in plan view, and are spaced apart and arranged side by side in the X1 direction orthogonal to the Y1 direction. The horizontal ridges 21 extend in the X1 direction, and the horizontal ridges 21 adjacent to each other with the vertical ridges 11 interposed therebetween are arranged in a straight line so that the horizontal ridges 21 are aligned with the vertical ridges 11, 11. connecting between Between the horizontal ridges 21 adjacent to each other with the vertical ridge 11 interposed therebetween, each width center line of these horizontal ridges 21 exists within the width range of the other adjacent horizontal ridges 21 . That is, the width center lines of the horizontal ribs 21 adjacent to each other with the vertical ribs 11 interposed therebetween are substantially aligned in the Y1 direction, and the positional deviation in the Y1 direction is, for example, within 5 mm. A portion surrounded by the vertical ridge 11 and the horizontal ridge 21 is a valley 14 recessed from the first surface Z1 side to the second surface Z2 side.

The concave-convex sheet 10 has a grid-like concave-convex surface on the first surface Z1 side by the vertical ribs 11 and the horizontal ribs 21 . The term “lattice” as used herein means that the vertical ridges 11 and the horizontal ridges 21 form a shape having lattice points and sides in a plan view. Includes various grid shapes such as grids. When the X1 direction and the Y1 direction on the first surface Z1 side are orthogonal to each other, when viewed from the first surface Z1 side, the ridges composed of the vertical ridges 11 and the horizontal ridges 21 are arranged in an orthogonal lattice. be. Since the ridges 11 and 21 are arranged in a grid pattern in this way, when a load is applied to the concave-convex sheet 10 from the first surface Z1 side, the load applied to the vertical ridges 11 is distributed to the horizontal ridges 21. When the uneven sheet 10 is used as the top sheet 2, excellent cushioning properties can be obtained. From the viewpoint of obtaining such cushioning properties, the uneven sheet 10 of the present embodiment may be used with the first surface Z1 side facing the skin.

The vertical ridges 11 have the same height along one direction (Y1 direction). This "equivalent height" means that the height is within the range of 0.9 to 1.1 times the measured average value.
As shown in FIGS. 12 and 13, the vertical ridges 11 are divided into a top region 11T and a wall portion 11W in the thickness direction of the uneven sheet 10. The top region 11T has the same height in one direction (Y1 direction). Well, it's extended. The top region 11T forms an outer fiber layer on the side of the first surface Z1. The wall portion 11W extends in the thickness direction from the top region 11T toward the second surface Z2. As shown in FIG. 14, the vertical ridge 11 has an internal space 12 extending in one direction (Y1 direction) inside the ridge 11 .

As shown in FIG. 15 , the horizontal ridges 21 are divided into top regions 21T and wall portions 21W in the thickness direction of the uneven sheet 10 . The top region 21T is positioned on the first surface Z1 side, and the wall portion 21W extends in the thickness direction from the top region 21T toward the second surface Z2 side. The horizontal rib portion 21 has an internal space 22 . The internal space 22 of the horizontal rib portion 21 and the internal space 12 of the vertical rib portion 11 communicate with each other on the second surface Z2 side.

In the uneven sheet 10, the Y1 direction on the first surface Z1 side corresponds to the Y1 direction on the second surface Z2 side, and the X1 direction on the first surface Z1 side corresponds to the X1 direction on the second surface Z2 side. ing. That is, the Y1 direction on the first surface Z1 side and the Y1 direction on the second surface Z2 side match, and the X1 direction on the first surface Z1 side and the X1 direction on the second surface Z2 side match.

On the side of the second surface Z2 of the uneven sheet 10, as shown in FIGS. 16 and 19, a plurality of ridges 31 extend in the Y1 direction on the side of the second surface Z2 in plan view and extend in the direction X1 orthogonal to the Y1 direction. are arranged side by side with a space in each direction. Further, a concave streak portion 36 sandwiched between adjacent protruding streak portions 31, 31 extends in the Y1 direction. On the second surface Z2 of the rugged sheet 10, a plurality of ridges 31 and ridges 36 extending in one direction (Y1 direction) are alternately arranged to form a linear rugged surface. The ridge portion 31 has an internal space 32 extending in the Y1 direction. The internal space 32 of the protruded streak portion 31 forms the valley portion 14 of the first surface Z1. As shown in FIG. 20, the grooved portion 36 corresponds to the internal space 12 of the vertical rib portion 11 on the side of the first surface Z1 described above. In other words, the back surface side of the vertical rib portion 11 is the recessed streak portion 36 . In this way, it is preferable that the first surface Z1 in the uneven structure has an uneven shape, and the second surface Z2 has an uneven shape corresponding to the first surface. With such a configuration, excrement such as stool can be easily held in the recesses on both the first surface Z1 and the second surface Z2.

As shown in FIGS. 17 and 18, the ridge portion 31 is divided into a top portion region 31T and a wall portion 31W in the thickness direction of the uneven sheet 10. As shown in FIGS. A wall portion 31W is common to the wall portion 11W. In other words, in a cross-sectional view of the concave-convex sheet 10 (in the thickness direction of the concave-convex sheet 10), each of the protrusions (vertical ribs 11) on the first surface Z1 and the protrusions (ridges 31) on the second surface Z2 are The convex portion (vertical ridge portion 11) on the first surface Z1 and the convex portion (ridge portion 31) on the second surface Z2 are continuous via common wall portions 11W and 31W.
The top region 31T refers to the upper side in the thickness direction (the second surface Z2 side), that is, the upper side (the second surface Z2 side) of the center of the thickness of the uneven sheet 10 . A plurality of protrusions 34 are arranged in a ridge-like manner in the top region 31T. Specifically, the protruding portion 31 is formed of a plurality of protruding portions 34, 34 arranged along the Y1 direction. A recess 35 recessed in the thickness direction is formed on the first surface Z1 side. As a result, the top region 31T has an uneven structure in which the convex portions 34 and the concave portions 35 are alternately arranged in a ridge-like manner. This convex portion 34 is hollow. Further, since the plurality of protrusions 34 are connected in a ridge-like manner, the protrusions 31 are arranged so that thin portions and thick portions are alternately connected in the Y1 direction.

In the thickness direction of the concave-convex sheet 10, the height h1 of each convex portion 34 is the same. Moreover, the height h2 of each concave portion 35 is substantially the same, and is lower than the height h1 of the convex portion 34. As shown in FIG. These heights h1 and h2 are heights using the surface of the top region 11T on the side of the first surface Z1 as a reference surface. The height h2 of the concave portion 35 is preferably less than 0.9 times the height h1 of the convex portion .
Regarding the height of each part forming the uneven structure such as the vertical ridge 11 and the horizontal ridge 21, "equal" means that the cross section of the nonwoven fabric is observed using a digital microscope VHX-1000 manufactured by Keyence Corporation, and the cross section of the nonwoven fabric is measured. When the height is measured, it means that the height is within the range of 0.9 to 1.1 times the measured average value.

When the concave-convex sheet 10 of the present embodiment is used as the topsheet 2, the concave-convex sheet 10 may be used with the second surface Z2 side facing the skin. In this case, the protrusions 34 of the uneven structure (protrusions 34 and recesses 35) in the top region 31T of the protrusions 31 are in a state of point contact, and further the recesses 36 function as air passages, so air permeability is excellent. . In addition, the ridge portion 31 has an undulating shape in which a plurality of ridge portions 34 are connected in a ridge-like manner. , with moderate elasticity and excellent cushioning properties. Moreover, since the protrusions 34 are hollow as described above, the amount of compressive deformation can be increased, and the cushioning property can be further improved.

In the uneven sheet 10 of the present embodiment, the vertical ridges 11 and the valleys 14, the horizontal ridges 21 and the valleys 14, and the vertical ridges 11 and the horizontal ridges 21 are mutually arranged on the first surface Z1. The fibers are fused together and integrated seamlessly. In addition, on the second surface Z2, the protruded streak portion 31 and the recessed streak portion 36 are seamlessly integrated by fusion bonding of at least some of the fibers to each other. In this way, each part is continuous, and these parts are connected to each other and support each other, so that it is bulky and thick.
In the concave-convex sheet 10 of the present embodiment, at least some of the fibers are fused at intersections other than the connecting portions.
The uneven sheet 10 may have crossing points where the fibers are not fused. Further, the uneven sheet 10 may contain fibers other than thermoplastic fibers. That is, in the uneven sheet 10, the thermoplastic fibers may be fused at intersections with other fibers.

From the viewpoint of providing excellent flexibility and cushioning properties, the thickness of the uneven sheet 10 is preferably the same as the thickness T3 of the topsheet 2 described above.

From the viewpoint of further improving the retention of feces in the uneven sheet 10, each dimension of the uneven structure is preferably within the following ranges.
The height H1 of the vertical rib portion 11 is preferably 2.5 mm or more, more preferably 3.0 mm or more, and preferably 5.0 mm or less, more preferably 4.5 mm or less. It is 5 mm or more and 5.0 mm or less, more preferably 3.0 mm or more and 4.5 mm or less.
The height H2 of the horizontal rib portion 21 is preferably 0.3 mm or more, more preferably 0.4 mm or more, preferably 1.1 mm or less, more preferably 1.0 mm or less, and preferably 0.4 mm or more. It is 3 mm or more and 1.1 mm or less, more preferably 0.4 mm or more and 1.0 mm or less.
The height h1 of the protrusions 34 in the protrusions 31 is preferably 0.7 mm or more, more preferably 0.8 mm or more, and preferably 1.5 mm or less, more preferably 1.4 mm or less, and It is preferably 0.7 mm or more and 1.5 mm or less, more preferably 0.8 mm or more and 1.4 mm or less.
The height h2 of the concave portion 35 in the convex portion 31 is preferably 0.6 mm or more, more preferably 0.7 mm or more, and preferably 1.4 mm or less, more preferably 1.3 mm or less. is 0.6 mm or more and 1.4 mm or less, more preferably 0.7 mm or more and 1.3 mm or less.

[Method for measuring height of uneven structure in nonwoven fabric (uneven sheet)]
Cut the nonwoven fabric to be measured into 10 cm x 10 cm. If the size of 10 cm x 10 cm cannot be obtained, cut it into as large an area as possible. Then, using a microscope (Digital Microscope VHX-1000 manufactured by KEYENCE CORPORATION), the thickness (height) of each portion is measured under no load. The measurement is performed at five different locations, and the average value of the measurements is taken as the height of each location. In addition, the height of each portion is measured at a portion where the convex portion in the concave-convex structure is not crushed. Through such measurements, in the thickness direction of the concave-convex sheet 10, the height H1 of the vertical ribs 11, the height H2 of the horizontal ribs 21, the height h1 of the protrusions 34 in the protrusions 31, and the height h1 of the recesses 35 Height h2 can be measured.

From the viewpoint of providing excellent flexibility and cushioning properties, the basis weight of the entire uneven sheet 10 is preferably within the following ranges.
The basis weight of the entire uneven sheet 10 is preferably 100 g/m ² or less, more preferably 60 g/m ² or less, and even more preferably 40 g/m ² or less.
The lower limit of the basis weight is not particularly limited, but from the viewpoint of further improving the texture of the nonwoven fabric, it is preferably 8 g/m ² or more, more preferably 10 g/m ² or more, and still more preferably 15 g/m ² or more. is.

[Method for measuring basis weight of nonwoven fabric]
Cut the nonwoven fabric to be measured into 10 cm x 10 cm. If 10 cm x 10 cm is not available, cut into as large an area as possible. The weight is measured using a balance, divided by the area of the nonwoven fabric, and the resulting value is taken as the basis weight.
When removing the nonwoven fabric to be measured from a commercially available absorbent article, etc., use cooling means such as cold spray to solidify the adhesive used in the absorbent article, and carefully peel off the nonwoven fabric to be measured and measure. . At this time, the adhesive is removed using an organic solvent. The means are the same for all other nonwoven measurements herein.

The uneven sheet 10 of this embodiment has a two-layer structure consisting of a first fiber layer forming the first surface Z1 and a second fiber layer forming the second surface Z2. In this case, the first fiber layer and the second fiber layer may contain the same type of constituent fibers, or may contain different types of constituent fibers.
Further, the basis weight of the constituent fibers of the first fiber layer and the second fiber layer may be the same, or the basis weight may be different.

A method for manufacturing the uneven sheet 10 of the present embodiment will be described. In the manufacturing method of this embodiment, a male support material 120 shown in FIG. 21A and a female support material 130 shown in FIG. At this time, the support male member 120 has protrusions 121 spaced apart in one direction and a direction orthogonal thereto. On the other hand, the support female member 130 has projections 131 continuous in one direction. The protrusion 121 of the support male member 120 and the protrusion 131 of the support female member 130 have a shape that allows them to be loosely inserted without interfering with each other. Then, as shown in FIG. 21(C), the fiber web 110 is placed on the support male member 120, and the fiber web 110 is pressed and sandwiched by the support female member 130 to be shaped.

The support male member 120 has a plurality of protrusions 121 corresponding to the positions where the valleys 14 surrounded by the vertical ribs 11, 11 and the horizontal ribs 21, 21 of the uneven sheet 10 are formed. Between the protrusions 121, 121 is a support recess 122 corresponding to the position where the top region 11T of the vertical ridge 11 on the first surface Z1 side is formed. As a result, the support male member 120 has an uneven shape, and the protrusions 121 and the support recesses 122 are alternately arranged in different directions in plan view. A support bottom portion 123 of the support recess 122 has a structure through which hot air blows through, for example, a plurality of holes are arranged (not shown). When the conveyed fiber web 110 is continuously or sequentially shaped to produce the uneven sheet 10, Y1 of the uneven sheet 10 in the supports (male support material, female support material) for manufacturing the uneven sheet 10 is The direction and the X1 direction correspond to, for example, the machine flow direction (MD direction) and the CD direction orthogonal to the MD direction.

From the viewpoint of applying hot air to the fiber web 110 more effectively, the support male member 120 corresponding to the support recess 122 may be perforated. The protrusion 121 may be prismatic or cylindrical. When viewed from the top, the figure shows a square shape with respect to the machine flow direction (MD direction) of the uneven sheet 10, but the shape from the top view is not particularly limited, and may be, for example, a rhombus. From the viewpoint of making it easier for the fibers to enter the support male member 120 and maintaining the moldability of the uneven sheet 10 and the thickness of the uneven sheet 10, the shape of the projections 121 is a prism, and the shape when viewed from above is A square shape is preferred.

The support female member 130 has a projection 131 corresponding to the support recess 122 of the support male member 120 and continuous in one direction in plan view. Between the protrusions 131, 131 is a support recess 132 corresponding to the protrusion 121 of the support male member 120 and continuous in the one direction. As a result, the support female member 130 has an uneven shape, and the protrusions 131 and the support recesses 132 are alternately arranged. A support bottom portion 133 of the support recess 132 has a structure through which hot air blows, and is provided with, for example, a plurality of holes. The distance between the protrusions 131 , 131 is wider than the width of the protrusion 121 of the support male member 120 . The distance is appropriately set so that the fibrous web 110 is sandwiched between the projections 121 of the male support member 120 and the projections 131 of the female support member 130 so that the wall portion in which the fibers are oriented in the thickness direction can be suitably shaped.

In the manufacturing method of the present embodiment, first, a fiber web 110 is supplied from a carding machine (not shown) to a device for shaping the web so as to have a predetermined thickness. The fiber web 110 may have a multilayer structure. For example, it may be a laminated web in which a first fiber web and a second fiber web are laminated.

Next, as shown in FIG. 21C, a fibrous web 110 containing thermoplastic fibers is placed on the male support material 120, and the female support material 130 is pushed into the male support material 120 from above the fibrous web 110. As shown in FIG. At this time, the protrusion 121 of the support male member 120 is inserted into the support recess 132 of the support female member 130 . Also, the protrusion 131 of the female support member 130 is inserted into the support concave portion 122 of the support male member 120 (see FIG. 22). This causes the fibers to be oriented in the thickness and plane directions. Further, the support female member 130 does not enter the support member recess 122 between the protrusions 121 , 121 of the support member 120 , corresponding to the support member recess 132 of the support female member 130 . However, since the fiber web 110 is sandwiched between the protrusions 131 at both ends of the support female member 130, the fibers in the support recesses 122 are stretched and the orientation of the fibers is changed. The fibers oriented in one direction along which the normal projections 131 extend change their orientation by pulling the fibers in the support recesses 122 . A nonwoven fibrous web 110 can now be produced that changes orientation when viewed from above.

22A and 22B show a state in which the protrusion 121 of the support male member 120 is inserted into the support recess 132 of the support female member 130. FIG. By setting such a state, a fiber layer corresponding to the bottom of the valley portion 14 is shaped. In addition, the fibers are oriented in the planar direction between the bottom of the support recess 122 and the top of the projection 131 . Since the protrusions 131 block the hot air, the fibrous layer to be formed has little fusion and a smooth fibrous layer is realized. As a result, a fiber layer corresponding to the top region 11T of the vertical rib portion 11 on the side of the first surface Z1 is formed.

Next, the female support member 130 inserted into the male support member 120 is removed, and as shown in FIG. Fusing.
In this case, hot air W is blown to the fiber web 110 from the opposite side of the uneven sheet 10 . The temperature of the hot air W at this time is preferably 0° C. or more and 70° C. or less higher than the melting point of the thermoplastic fibers that make up the fiber web 110, considering common fiber materials used in this type of product. It is more preferable that the temperature is 5°C or higher and 50°C or lower.
The wind speed of the hot air W is preferably 2 m/sec or more, more preferably 3 m/sec or more, although it depends on the height of the projections 121 of the support male member 120 . As a result, heat transfer to the fibers is sufficient, and the fibers are fused to each other, so that the uneven shape can be sufficiently fixed. Also, the wind speed of the hot air W is preferably 100 m/sec or less, more preferably 80 m/sec or less. As a result, excessive heat transfer to the fibers can be suppressed, and the texture of the uneven sheet 10 can be improved.

If the surface roughness of the female support member is reduced, it is possible to remove the female support member 130 in the step of blowing the hot air W without unfused fibers clinging to it. That is, after the web is produced, the male support member 120 can be inserted into the female support member 130, the female support member 130 can be removed as it is, and the web can be treated with the hot air W described above. This makes the processing easier. In addition, in the present embodiment, the surface to which hot air is applied at the time of manufacturing is the second surface Z2 side, but hot air is applied from the surface that will be the first surface Z1, and the fibers on the first surface Z1 side are separated from each other. You may make it have many fusion points.

23 is the first surface Z1 side, and the opposite surface of the obtained uneven sheet 10 is the second surface Z2 side. That is, the first surface Z1 side of the concave-convex sheet 10 is the side on which the male supporting member 120 is arranged, and the second surface Z2 side is the side to which the hot air W is blown. Therefore, due to the difference in the blowing amount of the hot air W, there are more fusion points between fibers in the top region 31T on the second surface Z2 side than in the top region 11T on the first surface Z1 side. Furthermore, due to the difference in the amount of heat, the surface of the top region 11T on the side of the first surface Z1 is less rough and has a better texture than the surface of the top region 31T on the side of the second surface Z2. Also, the same effect can be obtained depending on the distance from the hot air W. Further, by inserting the male support member 120 into the female support member 130 with the fiber web 110 sandwiched therebetween, the fibers in the top region 31T on the second surface Z2 side are pulled further toward the male support member 120. Head. Therefore, the top portion on the second surface Z2 side formed on the top portion of the projection 121 of the male support member 120 is higher than the top portion region 11T on the side of the first surface Z1 formed on the bottom portion of the recessed portion 122 of the support member 120 . The amount of fiber in region 31T is reduced.

Although the present invention has been described above based on its preferred embodiments, the present invention is not limited to the above-described embodiments. Moreover, you may combine embodiment mentioned above. For example, the absorbent article of the present invention may comprise the uneven sheet 10 shown in FIGS. It may be provided as the sheet 2 and provided with an upper absorbent body 41b shown in FIG.
Also, the surface sheet is not limited to the forms shown in FIGS. For example, the surface sheet is a composite sheet 70 in which a first sheet 71 and a second sheet 72 are laminated to each other at a plurality of joints 73 , and the first sheet 71 is the first sheet at a site other than the joints 73 . A convex portion projecting in a direction away from the second sheet 72 may be formed, and the joint portion 73 may be a concave portion (see FIG. 24). Sheets of such a configuration include those described in JP-A-2015-112343 and JP-A-2019-205685.

The present invention will be described in more detail below with reference to examples. However, the scope of the invention is not limited to such examples.

[Example 1]
In Example 1, a surface sheet having an uneven structure was produced by the following method.
A first fiber web (basis weight: 10 g) was prepared using thermoplastic fibers of a core-sheath type (polyethylene terephthalate (PET) (core): polyethylene (PE) (sheath) = 6:4 (mass ratio)) with a fineness of 1.3 dtex. /m ² ), and using thermoplastic fibers of core-sheath type (polyethylene terephthalate (PET) (core): polyethylene (PE) (sheath) = 6: 4 (mass ratio)) with a fineness of 4.4 dtex A second fibrous web (basis weight 25 g/m ² ) was produced. A laminated web was produced by laminating these first and second fiber webs. Next, the laminated web was arranged between the support male material 120 and the support female material 130 shown in FIGS. Next, the female support member 130 was removed, and fusion bonding was performed by blowing hot air W to produce a nonwoven fabric having a first surface and a second surface shown in FIGS. At this time, as the support male member 120, one provided with a cylindrical projection 121 having a height of 10 mm and a diameter of 2 mm when viewed from above was used. The pitch of the protrusions 121 was 5 mm in each of the MD and CD directions. As the female support member 130 , a metal member having linear protrusions 131 with a width of 2 mm was used and pushed between the protrusions 121 of the male support member 120 . The adjacent protrusions 121, 121 of the female support member 130 are arranged at a pitch of 5 mm, and the space for the fibers when the male support member 120 and the female support member 130 are pushed is 0.5 mm on one side. Both sides of the projection 121 of the support male member 120 were 1 mm together. This was used as the nonwoven fabric sample of Example 1. The hot air blowing treatment was performed under conditions of a temperature of 160° C., a wind speed of 6 m/sec, and a blowing time of 6 seconds.

In Example 1, an upper absorbent body was produced by the following method.
The fluff pulp and the water-absorbent polymer were uniformly mixed to produce a mixed stack. This mixed fiber stack was covered with a core wrap sheet (basis weight: 10 g/m ² ) made of nonwoven fabric to obtain an upper absorbent body.

In Example 1, a lower absorbent body was produced by the following method.
A water-absorbent polymer was placed between a backing paper (14 g/m ² basis weight) and an SMS nonwoven fabric (10 g/m ² basis weight) to produce a lower absorbent body. The water-absorbing polymer was fixed with a hot melt (basis weight: 10 g/m ² ) applied to each of the mount and the nonwoven fabric.

An absorbent body 4 was manufactured using the obtained upper layer absorbent body and lower layer absorbent body. Then, the surface sheet 2 was placed on the skin facing surface of the absorbent body 4 to form a composite. The composite was formed with the first surface (see FIG. 11) of the topsheet facing the skin. Other than such a composite, the constituent members of a commercially available diaper "Merries Tape Type S Size" were used to produce the diaper shown in FIG. 1 comprising the composite.

[Example 2]
A single-layer web (basis weight 40 g/ m ² ), and a surface sheet having an uneven structure was produced in the same manner as in Example 1, except that the single-layer web was subjected to shaping treatment.
Also, a diaper was manufactured using the absorbent body 4 having the specifications shown in Table 1 below. The absorbent body 4 and the diaper were manufactured in the same manner as in Example 1.

[Example 3]
A surface sheet having an uneven structure was produced in the same manner as in Example 1, except that the basis weight of the first fibrous web was 20 g/m ² and the basis weight of the second fibrous web was 50 g/m ² . .
Also, a diaper was manufactured using the absorbent body 4 having the specifications shown in Table 1 below. The absorbent body 4 and the diaper were manufactured in the same manner as in Example 1.

[Example 4]
In Example 4, a surface sheet having an uneven structure was produced by the following method.
In the same manner as the method described in JP-A-2015-112343, the belt-shaped first sheet is supplied between a first roll and a second roll whose peripheral surfaces are meshed with each other, and the first The sheet was deformed into an uneven shape. Next, after moving the first sheet 1 along the peripheral surface of the first roll from the meshing portion, the second sheet is supplied so as to be superimposed on the first sheet, and both sheets are placed on the convex portion of the first roll. and a heat roll while being heated, and partially bonded. At this time, the uneven shapes of the first roll and the second roll and the patterns of the joints formed by the first roll and the heat roll were made different between the central portion and the side portion of the first sheet.

In such a method, the depth of engagement between the first roll and the second roll was adjusted. Specifically, the ratio L7/L2 is 1.0 when L7 is the outer circumference length of the projections in the thickness direction cross-section along the longitudinal direction of the uneven sheet, and L2 is the length of the bottom of the projections in the same direction. 5 (see FIG. 24). The recessed portions of this uneven sheet are formed at portions other than the projected portions. A sheet having a first layer and a second layer was used as the first sheet. Nonwoven fabrics having a basis weight of 18 g/m ² produced by an air-through method were used as the sheets constituting the first layer and the second layer. The nonwoven fabric forming the first layer is made of first fibers. The nonwoven fabric constituting the second layer was composed of first fibers and second fibers, and the mass ratio of the first fibers to the second fibers in the second layer was first fibers/second fibers=70/30. As the first fiber and the second fiber, fibers having a core-sheath structure with a core component of polyethylene terephthalate (PET) and a sheath component of polyethylene (PE) were used. The first fiber has a diameter ratio of the core component to the sheath component, that is, the core component/sheath component is 1.57. The second fiber has the diameter ratio of the core component to the sheath component, that is, the core component/sheath component is was 1.17. As the second sheet, the same nonwoven fabric as that constituting the first layer was used.

In Example 4, a diaper was manufactured using the surface sheet obtained by the method described above and the absorbent body 4 having the specifications shown in Table 1 below. The absorbent body 4 and the diaper were manufactured in the same manner as in Example 1.

[Comparative Examples 1 to 3]
In Comparative Example 1, a topsheet was produced in the same manner as in Example 1, except that the shaping treatment was not performed. Such a surface sheet did not have an uneven structure. In Comparative Example 1, an absorbent body having the same structure as the upper absorbent body in Example 1 was used as the lower absorbent body, and an absorbent body having the same structure as the lower absorbent body in Example 1 was used as the upper absorbent body.
In Comparative Example 2, the same surface sheet as in Example 1 was used. In Comparative Example 2, an absorbent body having the same structure as the lower layer absorbent body of Example 2 was used as the upper layer absorbent body, and an absorbent body having the same structure as the upper layer absorbent body of Example 3 was used as the lower layer absorbent body.
In Comparative Example 3, the same topsheet as in Comparative Example 1 was used. In Comparative Example 3, an absorbent body having the same structure as the upper absorbent body in Example 2 was used as the upper absorbent body, and a lower absorbent body having the specifications shown in Table 1 below was used. Such a lower absorbent body was produced in the same manner as in Example 1.
Furthermore, in Comparative Examples 1 to 3, diapers were manufactured in the same manner as in Example 1.

Table 1 below shows the thickness T3 and basis weight of the surface sheet, the thickness T1 of the upper layer absorbent body, the thickness T2 of the lower layer absorbent body, and the absorbent core in each of the upper layer absorbent body and the lower layer absorbent body in each example and each comparative example. indicates the basis weight of the pulp that constitutes the Each of the thickness T1 of the upper absorbent body, the thickness T2 of the lower absorbent body, and the thickness T3 of the topsheet shown in Table 1 is the thickness at the crotch portion when the diaper is unfolded and placed under no pressure.

[Performance evaluation]
A model doll (made of acrylic) provided with excretion points was fitted with the diapers of each example and each comparative example, and the amount of feces adhering to the skin was measured by the following method. First, the diaper was put on the model doll, and the model doll was tilted so that the tilt angle of the model doll was 20° with respect to the horizontal plane. Next, 10 g of pseudo watery stool was injected into the site corresponding to the excretion point of the model doll, and left to stand for 30 seconds after injection. Thereafter, the diaper was removed from the model doll, and the amount of pseudo watery stool attached to the model doll was measured. The above operation was performed three times for each evaluation object, and the average value thereof was used as the measurement result.

The composition of the pseudo watery stool is 22.5% by mass of bentonite, 0.5% by mass of Poise 530 (40% by mass of solids, manufactured by Kao Corporation), and 0.03% by mass of Emulgen 130K (manufactured by Kao Corporation). ) is an aqueous solution of 1.5% by mass and ion-exchanged water is 75.5% by mass, and the viscosity is 40 mPa s (23 ° C., vibration type viscometer: SV-10 manufactured by A&D Co., Ltd.), surface tension was 55 mN/m.

As is clear from Table 1, Examples 1 to 4 satisfied the above conditions (1) and (2). On the other hand, Comparative Examples 1 and 2 did not satisfy the conditions (1) and (2), and Comparative Example 3 did not satisfy the condition (2).
Moreover, as is clear from Table 1, the diapers of Examples 1 to 4 had less fecal matter adhering to the skin than those of Comparative Examples 1 to 3.
From the above results, it was shown that the absorbent article of the present invention can effectively suppress adhesion of stool and the like to the skin.

1 Absorbent article 2 Top sheet 3 Back sheet 3a Exterior nonwoven fabric 4 Absorbent body 5 Absorbent main body 6 Leak-proof cuff 7 Side panel 8 Fastening tape 10 Concavo-convex sheet 41, 41a, 41b, 41c Upper layer absorbent body 43 Lower layer absorbent body 46a High tsubo Weight region 46b Low basis weight region 60 Cuff-forming sheet 61 Cuff-forming elastic member 63 Leg elastic member A Abdominal portion B Dorsal portion C Crotch portion AL Abdominal horizontal center line BL Dorsal horizontal center line X Vertical direction Y Horizontal direction

Claims (15)

Equipped with a surface sheet and an absorbent body, having a longitudinal direction corresponding to the front-rear direction of the wearer and a lateral direction orthogonal to the longitudinal direction, and having an abdominal portion, a crotch portion and a back portion along the longitudinal direction Also, an absorbent article,
The surface sheet has an uneven structure,
The absorbent body has an upper absorbent body and a lower absorbent body, and each of the upper absorbent body and the lower absorbent body includes an absorbent core,
In a state in which the absorbent article is unfolded and placed under no pressure, at least the crotch portion, where T1 is the thickness of the upper absorbent body, T2 is the thickness of the lower absorbent body, and T3 is the thickness of the topsheet, In the above, the absorbent article satisfies the following conditions (1) and (2).
T1>T2 (1)
T3>T2 (2) In the upper absorbent body, the absorbent core contains pulp and a water absorbent polymer,
2. The absorbent article according to claim 1, wherein the absorbent core of the lower absorbent body is mainly composed of a water absorbent polymer. 3. The absorbent article according to claim 1, wherein said upper layer absorbent body has a higher basis weight of pulp constituting said absorbent core than said lower layer absorbent body. The absorbent article according to any one of claims 1 to 3, wherein the upper layer absorbent body has a higher basis weight of the water-absorbing polymer constituting the absorbent core than the lower layer absorbent body. 2. The surface sheet has a first surface and a second surface, and in the uneven structure, the first surface has an uneven shape, and the second surface has an uneven shape corresponding to the first surface. 5. The absorbent article according to any one of 1 to 4. In a cross-sectional view of the surface sheet, when each of the convex portions of the uneven shape on the first surface and the convex portions of the uneven shape on the second surface are divided into a top region and a wall portion, the convex portions of the first surface 6. The absorbent article according to claim 5, wherein the portion and the convex portion on the second surface are continuous via a common wall portion. The upper absorbent body is continuous from the abdominal portion to the dorsal portion via the crotch portion,
The absorbent article according to any one of claims 1 to 6, wherein the absorbent core in the upper absorbent body has a higher basis weight in the abdominal side portion than in the dorsal side portion. The upper absorbent body is continuous from the abdominal portion to the dorsal portion via the crotch portion,
8. The absorbent article according to any one of claims 1 to 7, wherein the area of the upper absorbent body is larger in the abdominal portion than in the dorsal portion in plan view. The lower layer absorbent body is continuous from the abdominal side portion to the dorsal side portion via the crotch portion, and extends further toward the dorsal portion side than the upper layer absorbent body in the longitudinal direction. Item 9. The absorbent article according to any one of items 1 to 8. Side flap portions extending outward in the horizontal direction from both longitudinal side edges of the absorbent body, and a pair of fastening members positioned at both longitudinal side edges of the dorsal portion. cage,
The fastening member includes side panels extending outward in the lateral direction from both side edges of the side flap portion of the dorsal portion,
10. When assuming a dorsal lateral center line extending in the lateral direction by halving the side panel in the longitudinal direction, the upper absorbent body does not extend to the dorsal lateral center line. The absorbent article described. Side flap portions extending outward in the horizontal direction from both longitudinal side edges of the absorbent body, and a pair of fastening members positioned at both longitudinal side edges of the dorsal portion. cage,
The fastening member includes side panels extending outward in the lateral direction from both side edges of the side flap portion of the dorsal portion,
When the side panel is bisected in the longitudinal direction and a dorsal lateral center line extending in the lateral direction is assumed, the position of the dorsal lateral center line in the longitudinal direction satisfies the condition (2), The absorbent article according to any one of claims 1-10. Side flap portions extending outward in the horizontal direction from both longitudinal side edges of the absorbent body, and a pair of fastening members positioned at both longitudinal side edges of the dorsal portion. cage,
The fastening member includes side panels extending outward in the lateral direction from both side edges of the side flap portion of the dorsal portion,
When the side panel is bisected in the longitudinal direction and a dorsal lateral center line extending in the lateral direction is assumed, the following condition (3) is satisfied at the position of the dorsal lateral center line in the longitudinal direction: The absorbent article according to any one of claims 1-11.
T3>T1 (3) side flap portions extending outward in the horizontal direction from both side edges along the longitudinal direction of the absorber; It has a pair of ventral flaps,
Assuming that the ventral flap is bisected in the longitudinal direction and a ventral lateral centerline extending in the lateral direction is assumed, the condition (1) is satisfied at the position of the ventral lateral centerline in the longitudinal direction. , The absorbent article according to any one of claims 1 to 12. side flap portions extending outward in the horizontal direction from both side edges along the longitudinal direction of the absorber; It has a pair of ventral flaps,
Assuming that the ventral flap is bisected in the longitudinal direction and a ventral lateral centerline extending in the lateral direction is assumed, the following condition (4) is satisfied at the position of the ventral lateral centerline in the longitudinal direction. , The absorbent article according to any one of claims 1 to 12.
T1>T3 (4) side flap portions extending outward in the horizontal direction from both side edges along the longitudinal direction of the absorber; It has a pair of ventral flaps,
Assuming that the ventral flap is bisected in the longitudinal direction and a ventral lateral centerline extending in the lateral direction is assumed, the condition (2) is satisfied at the position of the ventral lateral centerline in the longitudinal direction. , The absorbent article according to any one of claims 1 to 14.

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