RU2677078C1 - Pants-type disposable diaper - Google Patents

Abstract

FIELD: satisfaction of human vital requirements.SUBSTANCE: elastic elements (5) located below the belt, which are stretched in the lateral direction (Y), are provided with gaps in the longitudinal direction (X) between sheet (31) forming the outer layer and sheet (32) forming the inner layer in a stretchable part, which is made with the possibility of stretching in the lateral direction (Y) in outer covering element (3), and formed compressive zone (35) of the outer covering element. On the side facing the skin, the surface of compressive zone (35) of the outer covering element, comb-shaped protruding parts (36) and parts (37) with grooves that extend in the longitudinal direction (X) are alternately in the lateral direction (Y). In parts (37) with grooves, which are located outside the part of absorbent element (23), end in the longitudinal direction, in compressing zone (35) of the outer covering element, sheets (31, 32) have through holes (33). Plurality of protrusions (210) and depressions (211), which extend in the longitudinal direction (X), are formed on the surface of top sheet (2) facing the skin, and recesses (211) are located in the same places in the lateral direction (Y) as grooved parts (37).EFFECT: present invention is intended to create a pull-on disposable diaper that has very good breathability and can prevent leakage of liquid while simultaneously effectively preventing an increase in moisture and skin problems.33 cl, 10 dwg

Description

Description

FIELD OF THE INVENTION

[0001]

The present invention relates to a pull-on disposable diaper in which a waist opening and two leg openings are formed.

State of the art

[0002]

A stretchable disposable diaper is traditionally known, which includes: an absorbent assembly that includes a fluid holding unit, an absorbent member and a top sheet that is provided on the surface side of the absorbent member facing the skin, and an outer covering member that is provided with side of the surface of the absorbent assembly, not facing the skin, and provides fixation of the absorbent assembly, while the outer covering element has a multilayer structure, incl. sistent sheet forming the inner layer, which is attached to the absorbent assembly, and a sheet forming an outer layer which is not attached to the skin facing surface of the sheet forming the inner layer. There are cases of using a stretch sheet that is stretchable in a direction (lateral direction of the diaper) perpendicular to the direction (longitudinal direction of the diaper) from the front side to the rear side of the wearer of the diaper as the outer covering element, due to considerations related to improving the fit of the diaper and the like.

[0003]

For example, Patent Literature 1 discloses a pull-on disposable diaper that has a configuration similar to that described above, and in which a plurality of below-waist belts, elastic elements that are laterally stretched, are provided in a part that corresponds to the waist of the user, and provided between the sheet forming the inner layer, and a sheet forming the outer layer, and some of the many located below the belt, elastic elements are provided so that they overlap part of the absorbent core, end in the longitudinal direction, when viewed from a top view. The arrangement of the elastic elements located below the belt described above is preferable due to the fact that the region in which the part of the absorbent core is located, the end in the longitudinal direction, is likely to come into close contact with the skin of the user, which prevents leakage of liquid and the like. The solution of Patent Literature 1 is intended primarily to eliminate the problem of wrinkles arising in the absorbent core due to the placement of the elastic elements described above, and therefore a specific means to solve this problem is directed to the absorbent core. Accordingly, in Patent Literature 1, in particular, a permeability problem is not disclosed, an improvement in the top sheet to solve this problem, and the like.

[0004]

Patent Literature 2 discloses a disposable diaper in which a sheet that has protrusions and recesses that are formed by performing alternately protruding protruding parts having a relatively high surface density and recessed parts having a low surface density is provided as an upper sheet so that the protruding parts are on the side facing the skin. In this top sheet, fluid secretions, such as urine, pass into parts with grooves that have a low surface density and are quickly absorbed. The following advantages are also disclosed in Patent Literature 2: “The stiffness of the sides of the protruding parts is high because the fibers are highly densified. Since the central parts located between the sides of the protruding parts contain many fibers oriented in the thickness direction, it is unlikely that the protruding parts will be easily flattened even under the influence of an additional weight. " However, Patent Literature 2 does not provide any means to solve the problem caused by the grooves of the recessed parts of this structure, which is that there is a gap between the diaper and the skin, and there is the possibility of leakage of liquid secretions, such as urine.

List of links

Patent Literature

[0005]

Patent Literature 1: JP 2013-255561 A

Patent Literature 2: US 2007298671 A1

SUMMARY OF THE INVENTION

[0006]

The present invention relates to a pull-on disposable diaper, including: a front portion configured to be placed on the abdominal side of the user, a rear portion configured to be placed on the dorsal side of the user, and a crotch portion provided between the front portion and the rear portion, the pull-on disposable diaper has a longitudinal direction extending from the front to the back through the crotch, and the lateral direction perpendicular to in the olfactory direction, and the pull-on disposable diaper further includes: an absorbent assembly including an absorbent member and a top sheet that is provided on the surface side of the absorbent member facing the skin, and an outer cover member that is provided on the surface side of the absorbent assembly, not facing the skin, and provides fixation of the absorbent assembly, and both side edge parts of the outer covering element in the front part and both side edge parts of the outer cover The backing member is fastened to form a waist hole and two leg holes.

The outer covering member includes a sheet forming an outer layer that is located on a side that is relatively distant from the absorbent assembly, and a sheet forming an inner layer that is located on a side that is relatively relative to the absorbent assembly, and further includes in itself stretching part in at least one of the front part and the rear part, while the stretching part is made with the possibility of stretching in the lateral direction.

A plurality of elastic elements located below the belt that are laterally stretched are provided at intervals in the longitudinal direction between the sheet forming the outer layer and the sheet forming the inner layer in the stretch portion so that a part of the plurality of elastic elements located below the belt passes through an overlapping portion that overlaps a longitudinally end portion of the absorbent member and intersects a longitudinally end portion in a lateral direction as viewed in the top view.

The stretch part is compressed laterally due to compression of the elastic elements located below the waist in the stretch part to form a compressible zone of the outer covering element, and the compressible zone of the outer covering element has an uneven structure on the side of the surface facing the skin in which the crest-like protruding parts and parts with grooves that extend in the longitudinal direction are alternately in the lateral direction.

At least one of the sheet forming the outer layer and the sheet forming the inner layer in the contracting area of the outer covering element has through holes that pass through it in the direction of its thickness in parts with grooves that are on the side that is outer in the longitudinal a direction with respect to a longitudinal end portion of the absorbent element.

On the surface of the top sheet facing the skin, a plurality of protrusions that protrude toward the skin of the user and a plurality of recesses that are located between the protrusions adjacent in the lateral direction and extend in the longitudinal direction are formed so that at least some of the many recesses are in the same places in the lateral direction as the parts with grooves in the compressible zone of the outer covering element.

Brief Description of the Drawings

[0007]

[Fig. 1] Fig. 1 is a perspective view schematically showing a pull-on disposable diaper according to an embodiment of the present invention.

[Fig. 2] Fig. 2 is a plan view schematically showing the side of the surface facing the skin (side of the inner surface) of the diaper of Fig. 1 in its flat unfolded and unstretched state.

[Fig. 3] Fig. 3 is an exploded perspective view schematically showing the diaper shown in Fig. 1 in its disassembled state.

[Fig. 4] Fig. 4 is a vertical sectional view schematically showing a sectional view taken along line I-I of Fig. 2.

[Fig. 5] Fig. 5 is a horizontal sectional view schematically showing a sectional view taken along line II-II of Fig. 2.

[Fig. 6] Fig. 6 is a horizontal sectional view schematically showing a section taken along line I-I shown in Fig. 2 when the diaper shown in Fig. 1 is in its natural or wearing state.

[Fig. 7] Fig. 7 is a perspective view schematically showing a portion of the absorbent assembly endwise in the longitudinal direction and an area near it when the diaper shown in Fig. 1 is in its natural or wearing state.

[Fig. 8] Fig. 8 is a perspective view schematically showing the contracting area of the outer covering member when the diaper shown in Fig. 1 is in its natural or wearing state.

[Fig. 9] Fig. 9 is a plan view schematically showing the outer covering element of the diaper shown in Fig. 1.

[Fig. 10] Fig. 10 is a partially exploded perspective view schematically showing an example of a sheet forming an outer layer that forms an outer covering element of the diaper shown in Fig. 1.

Description of Embodiments

[0008]

In a disposable diaper, liquid secretions, such as urine, that have been absorbed and held in the absorbent element, evaporate from the surface of the skin, due to the temperature of the wearer's body, and exit towards the wearer's skin as water vapor, resulting in internal space the diaper when it is worn or, in other words, in the space between the skin of the wearer and the diaper surface facing the skin, moisture increases, which can cause skin problems such as itching and rash. In particular, in a pull-on disposable diaper similar to that disclosed in Patent Literature 1, which includes lower belts, elastic elements that can stretch laterally when compressing the outer covering element in the lateral direction due to compression of the lower elastic belts when wearing a diaper, an absorbent assembly attached to the outer covering element, in particular an overlapping part that overlaps the lower belts, e astichnye elements when viewed in a plan view, it is also compressed in the lateral direction and is brought into contact with a skin member, which prevents the movement of water vapor in the longitudinal direction of the diaper and makes it difficult to yield steam outside through the waist-hole and it may cause increase in humidity. As a method of preventing a decrease in the breathability caused by the compression of the absorbent assembly, as described above, a method can be considered in which, for example, the overlapping portion of the elastic bands located below the belt, which is blocked by the absorbent assembly when viewed from above, is cut for suppressing the extensibility of lower elasticity of the elastic elements in the lateral direction. However, in this method, the absorbent assembly can be separated from the outer coating element in an upward direction, and as a result of separating the absorbent assembly in an upward direction from the outer coating element, not only does water vapor escape, which causes an increase in humidity, but also liquid leakage can occur discharge

[0009]

Accordingly, the present invention is intended to provide a stretchable disposable diaper that has very good breathability and can prevent leakage of liquid secretions while effectively preventing an increase in moisture and skin problems.

[0010]

Hereinafter, the present invention will be described by means of a preferred embodiment of the present invention with reference to the drawings. 1-7 show a schematic configuration of a pull-on disposable diaper 1, which is a pull-on disposable diaper according to an embodiment of the present invention, and a configuration of its respective components. The diaper 1 includes a front portion 1A configured to be placed on the abdominal side of the user, a rear portion 1C configured to be placed on the dorsal side of the user, and a crotch portion 1B that is provided between the front portion 1A and the rear portion 1C. The diaper 1 also has a longitudinal direction X, which extends from the front part 1A to the rear part 1C through the crotch part 1B, and the lateral direction Y, which is perpendicular to the longitudinal direction X.

[0011]

The diaper 1 includes: an absorbent assembly 2, which includes an absorbent element 23 and a top sheet 21, which is provided on the surface side of the absorbent element 23 facing the skin, and an outer covering element 3, which is located on the surface side of the absorbent assembly 2, not facing the skin, and ensures the fixation of the absorbent assembly 2. Both side edge parts of the outer covering element 3 in the front part 1A, which extend in the longitudinal direction X, and both side edge parts of the outer cover its element 3 in the rear part 1C, which extend in the longitudinal direction X, is fastened together to form two parts S and S, which are side seams, as well as holes WH for the waist, which "passes" around the waist of the user, and two holes LH and LH for the legs through which the user's legs pass.

[0012]

As used herein, the term “skin-facing surface” refers to the surface of a disposable diaper or its constituent element (eg, top sheet) that is intended to face the skin side of the wearer when wearing the diaper, or, in other words, the side , which is in relative proximity to the skin of the user. Similarly, the term “non-skin surface” refers to the surface of a disposable diaper or its constituent element, which is intended to face the side (side of the garment) that is opposite to the wearer's skin when wearing the diaper, or in other words, to a surface that is relatively distant from the user's skin. As used herein, the phrase “when wearing a disposable diaper” means a normal and proper position when wearing, or, in other words, a state in which the disposable diaper is correctly positioned when worn and does not cover a condition in which the disposable diaper is not in the correct wearing position.

[0013]

The front part 1A and the rear part 1C are parts that are provided in the same places in the longitudinal direction X as the parts S, which are the side seams, and are parts located below the belt, which should be placed around the user's waist when worn the diaper 1. The crotch portion 1B is a zone in which the recesses for forming the holes LH and LH for the legs are formed in both lateral edge parts of the outer covering element 3, which extend in the longitudinal direction X. The body part 1B includes a part facing the part in which the discharge is released and to be placed opposite the part of the user's body in which the discharge is released when wearing the diaper 1, and a part facing the part in which the discharge is released is usually provided center or near the center of the diaper 1 in the longitudinal direction X.

[0014]

As shown by the contour line in FIG. 2, the absorbent assembly 2 has an elongated rectangular shape when viewed from a top view. The absorbent assembly 2 is attached in the center of the outer covering element 3 in the lateral direction Y, while its longitudinal direction coincides with the longitudinal direction X of the diaper 1 in its flat unfolded and unstretched condition. The outer covering element 3 forms the outer contour of the diaper 1 in its flat unfolded and unstretched state, shown in FIG. 2, and the peripheral edge of the outer covering element 3 forms a contour line of the diaper 1 in the flat unfolded and unstretched state. As used herein, the expression “flattened and non-contracted state” of the diaper 1 refers to a state in which the diaper 1 is unfolded by separating portions S representing the side seams and the unfolded diaper 1 is stretched to the design dimensions (which are the same as the dimensions the diaper when it is flattened, without taking into account the influence of elastic elements) by stretching the elastic elements of the constituent elements.

[0015]

The absorbent assembly 2 includes a liquid permeable top sheet 21 that forms a skin facing surface, a liquid impermeable or less liquid permeable, or water repellent back sheet 22 that forms a skin non surface and configured to fluid retention, an absorbent element 23, which is provided between both sheets 21 and 22. They are bonded by using known bonding means, such as adhesive, to form an integrated structure Ry. The absorbent element 23 is located in the center of the diaper 1 (outer covering element 3) in the lateral direction Y. As the top sheet 21 and the back sheet 22, any type of sheet that is commonly used in an absorbent article of this type can be used without any limitation. For example, a nonwoven material, a porous film or the like can be used as the top sheet 21, and a polymer film, a laminate of a polymer film and a nonwoven material or the like can be used as the back sheet 22.

[0016]

When viewed from the top view shown in FIG. 2, the absorbent element 23 has a substantially elongated rectangular shape in the longitudinal direction X and extends from the front portion 1A to the rear portion 1C. The absorbent element 23 includes a fluid-retaining absorbent core 24 that contains absorbent material, and a core wrapping sheet 25 that covers the skin-facing surface and the non-skin-facing surface of the absorbent core 24. The absorbent core 24 and the sheet 25 for wrapping, the cores are bonded using a known bonding agent, such as hot melt adhesive.

[0017]

The absorbent core 24 has a single layer structure and is formed by stacking fibers of a core forming material that contains absorbent material. Any absorbent material that is commonly used to form this type of absorbent core can be used as an absorbent material without any particular limitation. For example, wood pulp, hydrophilic fibers, such as synthetic fibers that have been treated with a hydrophilicity agent, and absorbent polymer particles can be used. That is, the absorbent core 24 may be formed from a stack of fibers formed from hydrophilic fibers, or from particles of an absorbent polymer that rest on a stack of fibers. As the sheet 25 for wrapping the core can be used permeable sheet material. You can use, for example, paper, non-woven material and the like.

[0018]

As shown in FIGS. 2 and 5, on both sides of the surface of the absorbent assembly 2 facing the skin, which extend in the longitudinal direction X, two cuffs 28 and 28 are provided to prevent leakage, which are formed from a sheet material that is resistant to liquids or water repellent and breathable. One or more (one in this embodiment) elastic elements 29 in the form of a thread, designed to form cuffs that prevent leakage, are provided in a stretched state next to the free end portion of each cuff 28 that prevents leakage. Leakage cuffs 28 rise upward at least in the crotch portion 1B due to the compression of the elastic members 29 provided in the stretched state when the diaper 1 is worn, and thereby prevent fluid secretions, such as urine, from escaping outward in the lateral direction Y.

[0019]

As shown in FIG. 2, the outer covering member 3 is configured to extend from edge to edge of the front portion 1A, which corresponds to the lower portion of the front main portion, the rear portion 1C, which corresponds to the lower portion of the rear main portion, and the crotch portion 1B, which is provided between the front portion 1A and the rear portion 1C. Each of the two lateral edges that extend in the longitudinal direction X is bent to form an inwardly directed arc in the crotch portion 1B and to form two edge portions of the legs thereby. As shown in the plan view of FIG. 2, the outer covering element 2 has an hourglass shape in which the area central in the longitudinal direction X is curved inward in the lateral direction Y. In the outer covering element 3, both side edge parts A1 and A2 of the front parts 1A that extend in the longitudinal direction X and both side edge parts C1 and C2 of the rear portion 1C that extend in the longitudinal direction X are attached to each other by known bonding means, such as adhesive, heat sealing or ultrasonic welding. As a result of the fastening, as shown in FIG. 1, two parts S and S are formed in the diaper 1, which are side seams, as well as a hole WH for the waist and two holes LH and LH for the legs. In the area of the outer covering element 3, which forms the edge part of the hole, representing the hole LH for the legs, the elastic element 4 for the legs, designed to form assemblies for the legs, is provided in a stretched state. The elastic element 4 for the leg has the form of a thread or strip and is provided between the sheet 31 forming the outer layer and the sheet 32 forming the inner layer, which form the outer covering element 3, and is fixed between them by using an adhesive.

[0020]

As shown in FIGS. 3-5, the outer covering member 3 includes a sheet 31 forming an outer layer that is located on a side that is relatively distant from the absorbent assembly 2, and a sheet 32 forming an inner layer that is located on a side , which is in relative proximity to the absorbent assembly 2. When wearing the diaper 1, the sheet 32 forming the inner layer is located on the side close to the wearer's body and forms the surface (inner surface) of the diaper 1. The sheet 31, forming the outer outer layer, located on the side remote from the user's body, and forms a non-skin surface (outer surface) of the diaper 1. The sheet 31 forming the outer layer and the sheet 32 forming the inner layer are attached to each other in a predetermined area at using a known bonding agent such as an adhesive.

[0021]

The sheet 31 forming the outer layer further includes, in addition to a part that has the same shape and dimensions as the shape and dimensions of the sheet 32 forming the inner layer, a front protruding portion 31E that projects on the side of the front portion 1A outward from the sheet portion 32 forming the inner layer, which is end in the longitudinal direction X, when both sheets 31 and 32 are stacked, and the rear protruding portion 31E, which protrudes on the side of the rear part 1C outward from the part of the sheet 32 forming the inner layer, which is lateral in the longitudinal direction X. As shown in FIG. 2, both protruding parts 31E and 31E of the sheet 31 forming the outer layer are bent over the sheet 32 forming the inner layer so as to respectively close both ends end in the longitudinal direction X of the absorbent assembly 2 which is provided with its fixation on the sheet 32 forming the inner layer, and attached by adhesive to other constituent elements (sheet 32 forming the inner layer, the absorbent assembly 2 and cuffs 28 preventing leakage) of the diaper 1, which are enes to both protrusions 31E and 31E. The protruding parts 31E of the sheet 31 forming the outer layer serve as hydrophobic sheets, which will be described later.

[0022]

The outer covering member 3 includes, in at least one of the front portion 1A and the rear portion 1C, a stretch portion that is configured to stretch laterally Y. As used herein, “stretch portion of the outer cover member” refers to the area of the outer covering element 3, which can be stretched in the lateral direction Y, and in this embodiment, the part of the outer covering element 3, which is located in the front part 1A, and the part of the outer coating yvayuschego member 3 which is disposed in the rear portion 1C represent stretching part. More specifically, in this embodiment, the sheet 31 forming the outer layer and the sheet 32 forming the inner layer, which form the outer covering element 3, are non-stretch sheets that cannot be stretched. However, in each of the front portion 1A and the rear portion 1C, as will be described later, a plurality of below-belt elastic members 5 that are laterally stretched Y are provided between both sheets 31 and 32. Accordingly, due to the extensibility of the plurality of lower belts, elastic elements 5 in the lateral direction Y, the entire area of each of the "part of the outer covering element 3, which is located in the front part 1A", and "the part of the outer covering element 3, which is located in the rear part 1C", is a yazhimoy Y in the lateral direction and therefore is called "stretchable part".

[0023]

As shown in FIGS. 2-4, in the above “stretchable parts” or, in other words, in the part of the outer covering element 3, which is located in the front part 1A, and the part of the outer covering element 3, which is located in the back part 1C, many below the belt, elastic elements 5 that are stretched in the lateral direction Y are provided with gaps in the longitudinal direction X between the sheet 31 forming the outer layer and the sheet 32 forming the inner layer. When viewed from a top view, a part of the plurality of elastic elements located below the belt 5 passes through a part that is overlapped by a part 230 of the absorbent element 23, end in the longitudinal direction X, and intersects with the part 230, end in the longitudinal direction, in the lateral direction Y. More specifically, in each of the front part 1A and the rear part 1C, the longitudinally defined end 2X of the absorbent assembly 2 is located at a location located inside in the longitudinal direction X with respect to the longitudinally defined occurrence 3X outer end of the cover body 3 (i.e., the open edge of the waist opening WH). That is, each of the front part 1A and the rear part 1C is divided in the longitudinal direction X into a zone 10 without an absorbent assembly, which is located on the side farthest from the center in the longitudinal direction X, and a zone 11 with an absorbent assembly, which is located on the inside zones 10 without an absorbent assembly in the longitudinal direction X. Located below the belt, elastic elements 5 are provided in each of the zones 10 and 11. Each part 230 of the absorbent element 23, end in the longitudinal direction, is a zone that includes the end defined in the longitudinal direction, which forms part of the contour of the absorbent element 23, and the area near this end, defined in the longitudinal direction. In this embodiment, as shown in FIG. 4, the end of the absorbent member 23 in the longitudinal direction is provided at the same location in the longitudinal direction X as the end 2X of the absorbent assembly 2 in the longitudinal direction.

[0024]

When the diaper 1 is in its natural or wearing state shown in FIGS. 6 and 7, due to the compression of the lower belts, the elastic elements 5 in the “stretch parts” or, in other words, in each part of the outer covering element 3, which located in the front part 1A, and the part of the outer covering element 3, which is located in the rear part 1C, the "stretchable parts" are pulled together in the lateral direction Y, and thereby a compressible zone 35 of the outer covering element is formed, and on the side of the skin-facing surface of the compression zone 35 of the outer covering element, an uneven structure is formed in which the ridge-shaped protruding parts 36 and the grooved parts 37 that extend in the longitudinal direction X are provided alternately in the lateral direction Y. That is, the compression zone 35 of the outer covering the element is the “stretch portion” described above. Figures 6 and 7 show only the front portion 1A, but the compressible region 35 of the outer covering member is also formed in the rear portion 1C in the same manner as in the front portion 1A. In the configuration shown in FIG. 5, which shows the same area as that shown in FIG. 6, and which is a schematic view showing part of the diaper 1 in the flat unfolded and unstretched state shown in FIG. 2, the outer covering member 3 and below the belt, the elastic elements 5 are stretched in the lateral direction Y, and therefore, a compressible region 35 of the outer covering element is not formed.

[0025]

In each of the front portion 1A and the rear portion 1C, a compression zone 35 of the outer covering element is formed at least in a zone in which the elastic elements 5 are located below the waistband. In this embodiment, the compression zone 35 of the outer covering element is formed with coverage of the zone 10 without an absorbent assembly and zone 11 with an absorbent assembly and, as shown in FIG. 6, is also formed on an overlapping portion of zone 11 with an absorbent assembly that overlaps with the absorbent assembly 2 as viewed from above. A compressible zone 35 of the outer covering member is formed in the front portion 1A and the rear portion 1C. In other words, when the outer covering member 3 or, in other words, the “stretch portion” that is present in each of the front portion 1A and the rear portion 1C is compressed in the lateral direction Y, as shown in FIG. 6, the other constituent elements of the diaper (rear the sheet 22, the absorbent element 23, the top sheet 21 and the protruding part 31E of the sheet 31 forming the outer layer), which are integrally formed with the outer covering element 3 directly or indirectly, are also compressed in the lateral direction Y. Fig. 7 schematically shows with a melting in which the protruding portion 31E of the sheet 31 forming the outer layer is compressed in the lateral direction Y. The contracted state of the protruding portion 31E is substantially the same as the contracted state of the outer covering member 3, and as shown in FIG. 7, an uneven structure which is similar to the uneven structure (see FIG. 8) of the outer covering member 3, which is pulled in the lateral direction Y, is formed in the protruding portion 31E.

[0026]

Fig. 8 shows a portion of the contracting zone 35 of the outer covering element of the diaper 1 when it is in its natural state or in a wearing state. As shown in FIGS. 6 and 8, in this embodiment, in the contracting area 35 of the outer covering element, an uneven structure in which ridge-shaped protruding parts 36 and grooved parts 37 that extend in the longitudinal direction X are alternately provided in the lateral direction Y is formed not only on the surface facing the skin, or, in other words, on the surface on which the absorbent assembly 2 is located, but also on the surface not facing the skin. The crest-shaped protruding parts 36 on the side of the surface facing the skin and the comb-like protruding parts 36 on the side of the surface not facing the skin are in the same places in the lateral direction Y, and the part 37 with grooves on the side of the surface facing the skin , and parts 37 with grooves on the side of the surface not facing the skin are also in the same places in the lateral direction Y.

[0027]

In this embodiment, in the outer covering member 3, which is provided at least in the front portion 1A and the rear portion 1C, as shown in FIGS. 8 and 9, a sheet 31 forming an outer layer and a sheet 32 forming an inner layer, attached to each other in a plurality of fastened parts 38 of the outer covering element, which are spaced apart both in the longitudinal direction X and in the lateral direction Y, and located below the belt, elastic elements 5 are provided so that they do not pass through the fastened parts 38 zhnogo covering member. A plurality of elastic elements 5 located below the belt are attached to both sheets 31 and 32 only in both end parts of the below the belt elastic elements 5 in the direction of their length, in particular in the parts S, which are side seams, or in parts near them and not attached to both sheets 31 and 32 in other parts. In the outer covering element 3 having the above-described configuration, each of the sheet 31 forming the outer layer and the sheet 32 forming the inner layer forms a plurality of folds that overlap the plurality of lower elastic bands 5 extending across them and extend continuously into the longitudinal direction X, when the diaper 1 is in its natural state or condition when worn. The folds serve as ridge-shaped protruding parts 36 in the compressible zone 35 of the outer covering element, and the gaps between the folds serve as grooved parts 37 in the compressible zone 35 of the outer covering element. As the outer covering element that has pleats similar to those described above, for example, the composite stretch element disclosed in JP 2009-118986 A, which is an earlier application filed by the applicant for this application, can be used.

[0028]

This embodiment has such a configuration that the compressible region 35 of the outer covering element is formed in a more reliable manner in the region in which each part 230 of the absorbent element 23 is located, end in the longitudinal direction, and in the region near it, in particular at each end of the absorbent element 23 in the longitudinal direction and in the area near it (at each end 2X of the absorbent assembly 2 in the longitudinal direction and in the area near it).

That is, as shown in FIG. 4, the top sheet 21 has a protruding portion 21E that protrudes outward in the longitudinal direction X from that portion of the absorbent core 24 that is end in the longitudinal direction. If you look at the top view shown in FIG. 2, the protruding portion 21E overlaps the elastic elements 5 located below the waistband. More specifically, in this embodiment, as shown in FIG. 4, not only the top sheet 21, but also each of the back sheet 22 and the sheet for wrapping the core 25 has a protruding part that protrudes in the longitudinal direction X outward from that part of the absorbent core 24, which is end in the longitudinal direction. The ends in the protruding direction of the protruding parts of the sheets 21, 22 and 25 are in the same place in the longitudinal direction X and together form the end 2X of the absorbent assembly 2 in the longitudinal direction. In addition, the end of the absorbent element 23 in the longitudinal direction is the end of the core wrapping sheet 25, defined in the longitudinal direction, which is located on the side furthest from the center in the longitudinal direction X of the constituent elements of the absorbent assembly 23 and is flush with the end 2X absorbent assembly 2 in the longitudinal direction. That is, at the end of the absorbent element 23 in the longitudinal direction and in the area near it (at the end 2X of the absorbent assembly 2 in the longitudinal direction and in the area near it) there is a zone in which the absorbent core 24, which has high stiffness, is not provided, and located below the belt, the elastic elements 5 intersect with the zone without the absorbent core in the lateral direction Y. With this configuration, when the lower belts are elastic, the elastic elements 5 are pulled in the lateral direction Y when the diaper 1 is in its natural position. When worn or worn, the end of the absorbent element 23 in the longitudinal direction and the area near it are more easily compressed in the same direction, and therefore the compressible area 35 of the outer covering element, which has an uneven structure with a pronounced height difference between the comb-shaped protruding parts 36 and the parts 37 with grooves is likely to be formed in the area in which the portion 230 of the absorbent element 23 is located, end in the longitudinal direction, and in the area near it. The formation of a compressible zone 35 of the outer covering element, which has an uneven structure with a pronounced height difference, can further increase the breathability of the diaper 1 in combination with the uneven structure consisting of protrusions 210 and recesses 211 formed on the skin surface of the upper sheet 21, which will be described later.

[0029]

As shown in FIGS. 4 and 7, the sheet 31 forming the outer layer and the sheet 32 forming the inner layer have through holes 33 in the compressible zone 35 of the outer covering element passing through both sheets 31 and 32 in the thickness direction in parts 37 c grooves that are on the side external in the longitudinal direction X, with respect to the portion 230 of the absorbent element 23, end in the longitudinal direction (end 2X of the absorbent assembly 2 in the longitudinal direction). In this embodiment, as shown in FIG. 7, in each grooved part 37, a plurality of through holes 33 are made at intervals with a predetermined interval in the longitudinal direction X. However, both sheets 31 and 32 do not have through holes 33 in the ridge-shaped protruding parts 36 in compressible area 35 of the outer covering element.

[0030]

The through holes 33 serve as outlet pores for the release of water vapor generated from liquid secretions, such as urine, which can cause increased humidity when wearing the diaper 1. If we consider the function of releasing steam through the through holes 33, then when as a sheet 31, forming the outer layer, and the sheet 32 forming the inner layer, have many through holes 33, it is preferable that at least some of the through holes 33 of the sheet 31 forming the outer layer and the sheet 32 forming the inner layer overlap with each other, and more preferably, all the through holes 33 of the sheet 31 forming the outer layer and the sheet 32 forming the inner layer overlap with each other in a one-to-one correspondence with each other. There is no particular limitation on the shape of each through hole 33 when viewed from a plan view, and any suitable shape, such as a round shape, a triangular shape, or another polygonal shape, can be selected. In addition, the size and shape of each through hole 33, when viewed from a top view, may be the same in the sheet 31 forming the outer layer and the sheet 32 forming the inner layer, or may vary. Regarding the degree of overlap between the through holes 33 of the sheet 31 forming the outer layer and the through holes 33 of the sheet 32 forming the inner layer, in the case where the through holes 33 of the sheet 31 forming the outer layer and the through holes 33 of the sheet 32 forming the inner layer layer, have the same size and shape, when viewed from a top view, they do not necessarily completely overlap each other and can partially overlap each other.

[0031]

In this embodiment, as shown in FIG. 4, the through holes 33 extend in the thickness direction through the bonded portions 38 of the outer covering element, in which the sheet 31 forming the outer layer and the sheet 32 forming the inner layer are bonded. That is, it can be argued that in this embodiment, each of the sheet 31 forming the outer layer and the sheet 32 forming the inner layer has a plurality of through holes 33, and each of the through holes 33 of the sheet 31 forming the outer layer overlaps a corresponding one from the through holes 33 of the sheet 32 forming the inner layer at the location of the corresponding one of the bonded parts 38 of the outer covering element. With this configuration, the shape retaining ability of the through holes 33 is improved, and the steam in the diaper 1 can more reliably be vented out through the through holes 33, and therefore there is the possibility of effectively preventing an increase in humidity.

[0032]

In this embodiment, the through hole, denoted by 33 ′ in FIG. 4, is located between the lower elastic band 5 ′ and the absorbent element portion 230 that is lateral in the longitudinal direction, as shown in the schematic, while below the belt, the elastic element 5 'is one of a plurality of elastic elements 5 located below the belt, which is not overlapped by the portion 230 of the absorbent element 23, endwise in the longitudinal direction, and is closest to part 230 of the absorbent element 23, lateral in the longitudinal direction (towards the end 2X of the absorbent assembly 2 in the longitudinal direction), when viewed from a top view. Since the through hole 33 'is made in the above-described specific place, the through hole 33' has a particularly good shape retention ability compared to the other through holes 33, which are made in places farther from the absorbent element 23 than the through hole 33 '. Accordingly, the through hole 33 'can stably perform the function of releasing steam while wearing the diaper 1. That is, when the outer covering element 3 (the front protruding portion 31E) comes into tight contact with the skin due to the compression of the lower belts, the elastic elements 5 when wearing the diaper 1, in the compressible zone 35 of the outer covering element in which the through holes 33 are made, the through holes 33 formed in this contact zone may be closed due to deformation of the outer covering e element 3, which prevents the penetration of air. However, the through hole 33 'is made in a place closer to the absorbent element 23 than to the contact zone, and therefore it is less likely to be affected by the absorbent element 23, which has high rigidity, and deformation and closure of this hole will be unlikely and thus, it will be unlikely to prevent air penetration. For this reason, the above-described effect of preventing an increase in humidity can be further enhanced. In the embodiment shown in the schematic diagram, only one through hole 33 'is shown, but a plurality of through holes 33' can be formed. The through holes 33 'have the same configuration as the through holes 33, except for the place where the through holes 33' are made.

[0033]

For reasons related to the more reliable provision of through-holes 33 for their function and effect, it is preferable to set their sizes and the like in the following manner.

The maximum length of each through hole 33 when viewed from a top view (or the diameter when the through hole 33 is round when viewed from above) is preferably 1 mm or more, more preferably 1.5 mm or more, and preferably 5 mm or less and more preferably 4 mm or less.

The number of through holes 33 in the compressible zone 35 of the outer covering member is preferably 1 or more, more preferably 2 or more and preferably 15 or less and more preferably 12 or less per unit area, representing a square area of 10 mm square (with a square side length component of 10 mm) when viewed from a top view.

[0034]

As described above, in the outer covering element 3, parts (stretchable parts), which are respectively located in the front part 1A and the rear part 1C, are pulled together in the lateral direction Y when the diaper 1 is in its natural or wearing state, and therefore contracted zones 35 of the outer covering element, which have an uneven structure consisting of comb-shaped protruding parts 36 and grooved parts 37, are formed on the side of the surface facing the skin. The top sheet 21 also has an uneven structure that corresponds to an uneven structure on its surface facing the skin.

[0035]

That is, as shown in FIGS. 6 and 7, on the surface of the top sheet 21 facing the skin, a plurality of protrusions 210 are formed that protrude towards the skin of the user, and a plurality of recesses 211, each of which is located between the protrusions 210 and 210, adjacent in the lateral direction Y and extending in the longitudinal direction X. In the top sheet 21 of this embodiment, protrusions 210 that extend in the longitudinal direction X and recesses 211 that extend in the longitudinal direction X are alternately made in the lateral direction Y, and as a result of this, an uneven structure is formed on the surface of the upper sheet 21 facing the skin. The protrusions 210 and the recesses 211 are continuous along the entire length of the top sheet 21 in the longitudinal direction X. The top sheet 21 may have an uneven structure similar to that described above, at least on the surface facing the skin. The surface of the top sheet 21, not facing the skin, may have an uneven structure, as in this embodiment, but may not have an uneven structure.

[0036]

In an uneven structure consisting of protrusions 210 and recesses 211 in the top sheet 21, when the diaper 1 is in its flat unfolded and unstretched condition, or, in other words, when located below the waist, the elastic elements 5 of the outer covering element 3 are laterally stretched Y as shown in FIG. 5, the sub-protrusions 210 'and the sub-recesses 211' are provided alternately in the lateral direction Y, and therefore, the top sheet 21 as a whole has a wavy shape with regularly located protrusions and recesses. However, when the diaper 1 is in its natural state or when worn or, in other words, when located below the waistband, the elastic elements 5 are pulled together in the lateral direction Y, as shown in FIG. 6, the sub-protrusions 210 'and the indentations 211' are pulled in the lateral the Y direction together with other constituent elements which are integrally formed with the outer covering element 3, as a result of which one or more sub-protrusions 210 'and one or more sub-depressions 211' are connected to form one protrusion 210, and part m a plurality of sub-depressions 211 'forms a recess 211, which protrudes in a direction opposite to the protrusion direction of the protrusions 210 (towards the absorbent element 23). That is, each protrusion 210 of the topsheet 21, when the diaper 1 is in its natural or wearing state, is a combination of the sub-protrusions 210 'and the sub-cavities 211', and relatively small protrusions are formed on the outer surface (facing the skin surface) of the protrusion 210 and depressions, which consist of sub-protrusions 210 'and sub-depressions 211'. Accordingly, the protrusions 210 are not in full contact with the hydrophobic sheet 31E (described later), which covers the outer surface of the protrusions 210, and therefore, hollow portions are formed between the protrusions 210 and the hydrophobic sheet 31E. The recesses 211 'and the recesses 211 usually have different shapes and / or sizes, but can have substantially the same shapes and / or sizes.

[0037]

In addition, in the diaper 1 according to this embodiment, as shown in FIG. 7, at least some of the plurality of recesses 211 of the top sheet 21 are in the same places in the lateral direction Y as the grooved part 37 in the compressible zone 35 outer covering element. That is, the grooved portions 37 in the contracting region 35 of the outer covering member are located on the longitudinal extension lines X extending in at least some of the plurality of recesses 211 of the top sheet 21. In the embodiment shown in FIG. 7, the plurality of recesses 211 on the surface of the upper sheet 21 facing the skin, there is a one-to-one correspondence with each of the plurality of grooved parts 37 in the compressible area 35 of the outer covering element. That is, each recess 211 is made in the same place in the lateral direction Y as the corresponding one of the grooved parts 37. With this configuration, the breathability of the diaper 1 is improved, and therefore an increase in humidity in the diaper 1 when it is worn is unlikely to occur. As a result, skin problems such as pruritus and rash are effectively prevented.

[0038]

That is, since in the diaper 1 of the part 37 with the grooves of the outer covering element 3 (the contracting zone 35 of the outer covering element) in the contracted state, lateral direction Y is provided at the same places as the recesses 211 of the top sheet 21, “air passage channels, which extend in the longitudinal direction X ”, which are formed from recesses 211 and grooved parts 37, which are provided at the same places in the lateral direction Y, are formed so that they extend from the absorbent assembly 2 to the end 3X of the outer coating length 3 (i.e., to the open edge of the waist opening WH). As a result, air permeability increases, and therefore, an increase in humidity in the diaper 1 is unlikely to occur when worn. That is, even if liquid secretions, such as urine and sweat, absorbed and held in the absorbent element 23 (absorbent core 24) of the absorbent assembly 2, evaporate due to the temperature of the body of the user and exit the top sheet 21 towards the skin of the user in the form of water vapor while wearing the diaper 1, water vapor passes through the recesses 211 and grooved parts 37 and is discharged out of the diaper 1 through the waist hole WH or is discharged out of the diaper 1 through the through holes 33 formed in the parts 37 c grooves. Accordingly, an increase in humidity in the diaper 1 is unlikely to occur while it is being worn, and therefore, the user is unlikely to have skin problems. The interval (step of the protrusions / recesses) between the protrusions 210 and the recesses 211 of the top sheet 21 is usually less than the interval (the step of the comb-shaped protrusions / grooves) between the comb-shaped protruding parts 36 and the parts 37 with the grooves of the outer covering element 3. Accordingly, the parts 37 with grooves that have a relatively large length in the lateral direction Y or, in other words, a relatively large width, are always located in the same places in the lateral direction Y as the recesses 211, which have a relatively short length in the lateral direction SRI Y or, in other words, a relatively small width, but not necessarily vice versa. At least a portion of the plurality of recesses 211 is located at the same locations in the lateral direction Y as the grooved parts 37. In particular, it is preferable that one of the three recesses 211 is located in the same place as one part 37 with a groove.

[0039]

As used herein, the expression “recess 211 of the top sheet 21 is located at the same position in the lateral direction Y as the part 37 with a groove in the compressible area 35 of the outer covering element (in the outer covering element 3)” means that the imaginary center line , which divides the grooved parts 37 in half in the lateral direction Y and extends in the longitudinal direction X, passes through an area with a size within 1 mm defined in the lateral direction Y from the baseline, which is an imaginary axis a line that divides the recess 211 in half in the lateral direction Y and runs in the longitudinal direction X.

[0040]

In addition, in the diaper 1, when viewed from a top view located below the belt, the elastic elements 5 pass through the overlapping part, which overlaps with the part 230 of the absorbent element 23, end in the longitudinal direction, and intersect with the overlapping part in the lateral direction Y. Accordingly when the outer covering element 3 (the compressible region 35 of the outer covering element) is compressed in the lateral direction Y when the diaper 1 is worn, it is unlikely that the absorbent element 23 will separate or, in other words, abs rbiruyuschego unit 2 in an upward direction from the outer covering member 3. This also improves breathability and prevents moisture and leaking liquid.

[0041]

Furthermore, even if the absorbent assembly 2 is compressed laterally Y and comes into contact with the skin of the wearer when wearing the diaper 1, or even if the absorbent assembly 2 is separated upward from the outer covering element 3 and comes into contact with the skin of the wearer when the diaper 1 is worn since the skin surface of the top sheet 21, which is the skin contact surface, has an uneven structure consisting of protrusions 210 and recesses 211, the skin surface of the top sheet 21 as a whole not in full contact with the user's skin. It also improves breathability and prevents moisture increase. If the surface of the upper sheet facing the skin is a flat surface without an uneven structure, the flat surface as a whole may come into full contact with the skin of the user, and thus, it may not be possible to prevent an increase in humidity.

[0042]

For reasons related to the more reliable functioning of the diaper 1 described above and the effects thereof, it is preferable to set the dimensions and the like characteristics of the constituent elements as follows.

On the surface of the upper sheet 21 facing the skin, the distance between all the vertices (portions of the protrusions that protrude farthest towards the user's skin) of the protrusions 210 and 210 adjacent to each other in the lateral direction Y is preferably 1.5 mm or more and more preferably 2 mm or more and preferably 5 mm or less and more preferably 4.5 mm or less. The dividing distance between the vertices of the protrusions 210 in the lateral direction Y is closely related to the length in the lateral direction Y or, in other words, to the width of the recesses 211.

The length of the recesses 211 in the longitudinal direction X is preferably 7 mm or more and more preferably 10 mm or more and preferably 60 mm or less and more preferably 50 mm or less.

When the diaper 1 is in its natural or wearing state, the number of recesses 211 of the top sheet 21 at the location of the end 2X of the absorbent assembly 2 in the longitudinal direction is preferably 15 or more and more preferably 20 or more and preferably 50 or less and more preferably 40 or less.

[0043]

The number of elastic elements 5 below the belt in the front portion 1A or the rear portion 1C is preferably 10 or more and more preferably 12 or more and preferably 35 or less and more preferably 30 or less.

In the front part 1A or the rear part 1C, when viewed from a top view, the number of elastic elements 5 located below the belt that pass through the overlapping part that overlaps the absorbent element 23 and intersect with the absorbent element 23 in the lateral direction Y is preferably 1 or more and preferably is 15 or less and more preferably 12 or less.

[0044]

In the diaper 1 according to this embodiment, as shown in FIGS. 2, 4 and 5, the top sheet 21 overlaps the portions 230 of the absorbent element 23, longitudinally end, in the contractible zones 35 of the outer covering element (zone 10 with the absorbent assembly and zone 11 without an absorbent assembly), and in each compressible area 35 of the outer covering element, the skin-facing surface of the top sheet 21 is covered by a hydrophobic sheet 31E as viewed from above. The hydrophobic sheet 31E of the present invention is, as described above, a protruding portion 31E, which is a portion of the sheet 31 forming the outer layer.

[0045]

The hydrophobic sheet 31E is used mainly for reasons related to improving air permeability, and can eliminate the disadvantages caused by the uneven structure of the surface of the top sheet 21 facing the skin. That is, for reasons related to breathability, it is advisable to form recesses 211 that extend in the longitudinal direction X on the surface of the upper sheet 21 facing the skin, but recesses 211 can serve not only as channels for the passage of water vapor, but also in as channels for the movement of fluid secretions such as urine. Accordingly, there is a possibility that liquid discharges will leak out through recesses 211, causing leakage of liquid. On the contrary, as shown in FIGS. 2, 4 and 5, the surface of the upper sheet 21 facing the skin and having an uneven structure is covered by a hydrophobic sheet 31E. Accordingly, liquid precipitates that can extend in the longitudinal direction X through recesses 211 can be blocked by a hydrophobic sheet 31E, and therefore, fluid leakage can be effectively prevented.

[0046]

The hydrophobic sheet 31E is preferably attached to the top sheet 21 in the region of the protrusions 210, more preferably at the tops of the protrusions 210, by means of the fastened parts 6 and is not attached to the top sheet 21 in the recesses 211. With this configuration, even when the skin surface of the top sheet 21 is closed hydrophobic sheet 31E, cavities are formed between the recesses 211 and the hydrophobic sheet 31E at the locations of the recesses 211 on the surface of the upper sheet 21 facing the skin. Accordingly, there is no possibility of obstructing the functioning of the recesses 211 as channels for the passage of air. The connection between the hydrophobic sheet 31E and the top sheet 21 can be made using known bonding means, such as hot-melt adhesive. In this embodiment, the bonded parts 6 are parts in which the adhesive is applied.

[0047]

In this embodiment, as shown in FIG. 4, bonded portions 6 between the hydrophobic sheet 31E and the topsheet 21 are provided with gaps in the longitudinal direction X. More specifically, FIG. 5 shows a linear bonded portion 6 that is continuous over the entire length of the portion , in which the hydrophobic sheet 31E and the top sheet 21 overlap, in the lateral direction Y and extends linearly in the lateral direction Y, when viewed from a top view. Many (three in FIG. 4) of such linear bonded parts 6 are formed at a predetermined interval in the longitudinal direction X. The bonded parts 6 themselves are capable of blocking fluid secretions, such as urine. When bonded parts 6 having such a function are performed in the manner described above in combination with the liquid leakage prevention effect provided by the hydrophobic sheet 31E, liquid leakage can be more effectively prevented.

[0048]

In addition, in this embodiment, as shown in FIG. 4, the portion 31EX of the hydrophobic sheet 31E, which is laterally provided in the longitudinal direction X, is a free end portion that is not attached to the top sheet 21. In this configuration, the portion 31EX of the hydrophobic of sheet 31E, which is laterally on the inside in the longitudinal direction X, rises up towards the skin, and the effect of blocking fluid secretions, such as urine, can be easily achieved.

[0049]

In the present invention, whether the sheet or the partial zone of the sheet is hydrophilic (s) or hydrophobic (s) is determined based on the fiber contact angle measured by the method described below. In particular, fibers are defined as hydrophilic when they have a contact angle of less than 90 degrees, and are defined as hydrophobic when they have a contact angle of 90 degrees or more. The smaller the fiber contact angle measured by the method described below, the higher the hydrophilicity (the lower the hydrophobicity), and the larger the contact angle, the lower the hydrophilicity (the higher the hydrophobicity). In the hydrophobic sheet 31E according to this embodiment, the fibers in their entire area have a contact angle, measured by the method described below, which is less than 90 degrees.

[0050]

<Contact Angle Measurement Method>

The target sheet for measurements (non-woven material) is placed so that its cross section in the thickness direction is facing up. A plurality of fibers are randomly selected as samples from a portion of the upper surface of the sheet with a dimension in the thickness direction of up to 1/10 of the thickness, and the contact angle of water is measured. An MCA-J automatic angle measuring instrument supplied by Kyowa Interface Science Co., Ltd. is used as a measuring device. Distilled water is used to measure the contact angle. The amount of liquid exiting the inkjet device for ejecting water droplets (Pulse Injector CTC-25, supplied by Cluster Technology Co., Ltd., with an injector opening size of 25 μm) is set to 15 picoliters. A drop of water is dripped directly onto the center of each fiber, and the process of dropping the drop is recorded by means of a horizontally mounted, high-speed video recorder that is connected to the camera. The DVR is preferably a personal computer equipped with a high-speed image capture device, taking into account the later image analysis. With this measurement, images are recorded every 17 milliseconds. In the recorded video material, the first image of a drop of water that fell first on the fiber is subjected to image analysis using the accompanying FAMAS software (version: 2.6.2; measurement method: method of a resting drop; analysis method: method θ / 2; image processing algorithm: non-reflective; type of processed image: frame; threshold level: 200; curvature correction: none). After that, the angle between the fiber and the surface of the water droplet, which is in contact with air, is calculated, and the calculated value is determined as the contact angle. The fiber used is a fiber that is cut off with a fiber length of approximately 1 mm, and the fiber is placed on a sample support in a contact angle measuring apparatus and held horizontally. The value obtained by measuring the contact angles of five fibers to the first decimal place and determining the average value of the measured angles obtained in a total of ten places (which is rounded to the first decimal place) is defined as the contact angle. A fiber with a lower contact angle has a higher hydrophilicity. The following characteristics of the measurement medium were set: the indoor temperature of 22 ± 2 ° C and the relative humidity of 65 ± 2%.

[0051]

The hydrophobic sheet 31E according to this embodiment is a part of the sheet 31 forming the outer layer, but the hydrophobic sheet according to the present invention is not limited to this. The hydrophobic sheet may be a hydrophobic sheet provided separately from the other constituent elements of the diaper 1. As a hydrophobic sheet according to the present invention, a non-woven material is preferred that lends itself to lateral stretching Y. When using a hydrophobic sheet 31E formed from such a stretch sheet, it is hydrophobic the sheet 31E is attached to the top sheet 21 on the tops of the protrusions 210 by means of the fastened parts 6, but not attached to the top sheet 21 at recesses 6, and therefore cavities are likely to be formed between the hydrophobic sheet 31E and the top sheet 21 at the locations of the recesses 211 on the surface of the top sheet 21 facing the skin. Accordingly, it is possible to obtain an effect consisting in the fact that it will be unlikely to impede the functioning of the recesses 211 as channels for the passage of air.

[0052]

As used herein, the term “stretch sheet” refers to a sheet that lends itself to stretching in a predetermined direction (e.g., laterally), and more specifically, to a sheet that has a maximum elongation in a predetermined direction (e.g., laterally), component of 100% or more, and the degree of recovery after elongation (the degree of recovery after elongation at a relative elongation of 100%) of at least 70% or more, while the degree of recovery after elongation is radiated by stretching the sheet in a predetermined direction to a relative elongation of 100%, and then allowing compression of the sheet.

[0053]

The hydrophobic sheet 31E, which lends itself to stretching in the lateral direction Y, is configured to stretch it in the lateral direction Y to a greater extent than in the longitudinal direction X. More specifically, the sheet 31 forming the outer layer stretches substantially in the lateral direction Y and then it shrinks (with a maximum elongation of 100% or more, and the degree of recovery after elongation of 70% or more), but it stretches only slightly to the longitudinal direction (n for example, with a maximum elongation of 50% or less). The degree of recovery of the sheet after elongation is determined using the method below.

[0054]

<Method for measuring the degree of recovery after elongation>

A sample having a length of 50 mm and a width of 25 mm is obtained from the target sheet for measurements. The sample is secured between the clamps (at a distance of K0 between the clamps) in a tensile testing machine (TENSILON RTC-1150A supplied by Orientec, Co. Ltd.). By increasing the distance between the clamps with a stroke speed of 300 mm / min, the sample is pulled and stretched to a length K2 (= K0 × 2), which is the length of the sample with a relative elongation of 100%, and then the distance between the clamps is reduced with speed, same as speed. The length of the sample at the moment when the tensile stress reaches 0 is set as the length K1 after recovery after elongation. The degree of recovery after elongation of the target sheet for measurements with an elongation of 100% is calculated by the following equation:

the degree (%) of recovery after elongation at 100% relative elongation = [(K2 - K1) / (K2 - K0)] × 100

[0055]

Preferred examples of the stretchable hydrophobic sheet 31E include: (1) a stretchable sheet in which the stretchable fibrous layer is integrally formed on both sides or on one side of the elastic fibrous layer; (2) a stretch sheet in which a stretch fibrous layer is formed on both sides or on one side of the mesh elastic sheet as a whole with it; (3) a stretch sheet in which a fibrous layer that can be stretched is formed on both sides or on one side of an elastic sheet made of an elastic film as a whole with it, and (4) a stretch sheet in which a large number of elastic filament yarns arranged so that they extend in the same direction without intersecting with each other are attached along the entire length of the stretchable nonwoven fabric in a substantially unstretched state. As a method for forming the elastic fibrous layer and the stretchable fibrous layer as a whole, for example, methods such as stacking and hydraulically entangling the elastic fibrous layer and the stretchable fibrous layer, tangling the fibers using a method for passing through and bonding the elastic fibrous layer and, for example, can be used. stretchable fibrous layer through the use of thermal bonding, adhesive or ultrasonic welding.

[0056]

10 shows a preferred example of a stretchable hydrophobic sheet 31E. The hydrophobic sheet 31E shown in FIG. 10 corresponds to the stretch sheet (4) described above and is configured so that elastic filament fibers in the form of filaments are attached to one surface of the stretch fibrous layer consisting mainly of non-elastic fibers. The hydrophobic sheet 31E includes both fibrous sheets 310 and 311, which serve as fibrous layers, and elastic elements 312, which are provided between both sheets 310 and 311 and serve as elastic filament yarns. Stretchable hydrophobic sheet 31E, which has the above configuration, can be manufactured, for example, using the method disclosed in JP 2009-61743A.

[0057]

Both of the two sheets 310 and 311, which form the stretchable hydrophobic sheet 31E, are stretchable. Sheets 310 and 311 are stretchable in the same direction as the direction in which the elastic members 312 are stretched (in the lateral direction Y). As used herein, the term “stretchable” covers the following cases: (i) the constituent fiber of the sheets 301 and 311 is stretchable and (ii) the constituent fiber is not stretchable, but the sheets 310 and 311 are generally stretchable due to the fact that the fibers that bonded at intersections, a three-dimensional structure formed by a plurality of bonded fibers or the like is separated from one another, structurally changed, or constituent fibers are broken.

[0058]

The elastic members 312, which form the stretchable hydrophobic sheet 31E, are elastic filament yarns obtained by stretching a molten or softened elastic resin. Each of the plurality of elastic members 312 is substantially continuous over the entire length of the sheet 31E (the entire length of the outer covering member 3 in the lateral direction Y). Many elastic elements 312 are arranged so that they extend in the same direction (in the lateral direction Y), without intersecting each other. The elastic elements 312 are attached in a substantially unstretched state to both sheets 310 and 311. The elastic elements 312 are attached between the sheets 310 and 311 in the sheet 31E by connecting the constituent fibers (inelastic fibers) that form the sheets 310 and 311 with the elastic elements 312 and fusion with elastic members 312 and, therefore, is not performed by using an adhesive, such as hot-melt adhesive. Accordingly, between the sheets 310 and 311 (stretchable fibrous layers consisting mainly of inelastic fibers) and the elastic elements 312 that are attached to the sheets 310 and 311, there is no adhesive.

[0059]

The stretchable hydrophobic sheet 31E is configured to stretch in the same direction as the direction (lateral direction Y) in which the elastic elements 312 are stretched. The elongation of the sheet 31E is ensured by the elasticity of the elastic elements 312. When the sheet 31E is stretched in the same direction as and the direction in which the elastic elements 312 are stretched, the elastic elements 312 and the sheets 310 and 311 are stretched. When the stretching of the sheet 31E is stopped, the elastic elements 312 are pulled together, and as a result of compression, the sheets 310 and 311 return to their original state before stretching the sheet 31E. In addition, there is no other elastic element attached to the sheet 31E perpendicularly to the elastic elements 312. Accordingly, when the sheet 31E is stretched in the same direction as the direction (lateral direction Y) in which the elastic elements 312 are stretched, sheet 31E stretches without any “shrinkage” of the sheet 31E in the lateral direction Y or, in other words, without the so-called reduction in width.

[0060]

Both sheets 310 and 311, which form a stretchable hydrophobic sheet 31E, may be non-woven materials made using staple fiber. Examples of nonwoven materials include nonwovens held together by passing air through, nonwovens held together by heated rollers, nonwovens obtained by hydro-entangling, nonwovens of a spunbond manufacturing method, and nonwovens obtained by melt aerodynamics. Sheet 310 and sheet 311 may be sheets of the same types or may be sheets of different types. As used herein, the expression “sheets of the same type” refers to sheets that are the same in terms of the manufacturing process of the sheets, such as the constituent fibers of the sheet, the diameter of the fibers and the length of the constituent fibers and the thickness and surface density of the sheet. Sheets that differ in relation to at least one of these characteristics are “sheets of different types”.

[0061]

The elastic elements 312 (elastic filament yarns) that are included in the stretchable hydrophobic sheet 31E are made by using, for example, a thermoplastic elastomer, rubber or the like as a starting material. In particular, if a thermoplastic elastomer is used as a starting material, it is possible to perform melt spinning / spinning using an extruder, as in the case of a conventional thermoplastic resin. In addition, elastic filament yarns obtained by melt spinning can be easily fused, and therefore they are preferably used to form sheet 31E. Examples of a thermoplastic elastomer include: styrene-based elastomers such as SBS (a block alternating block copolymer of styrene and butadiene), SIS (a block alternating block copolymer of styrene and isoprene), SEBS (an alternating block copolymer of styrene and ethylene-butadiene alternating blocks) and SEPS (block copolymer of styrene and ethylene-propylene with alternating blocks); olefin-based elastomers (ethylene-based α-olefin elastomer and propylene-based elastomer obtained by copolymerization of ethylene, butane, octene and the like); polyester-based elastomers and polyurethane-based elastomers. They can be used singly or in combination of two or more. In addition, it is also possible to use a multicomponent fiber with a core and cladding or with the arrangement of components side by side, made of any of the resins listed above.

[0062]

On the other hand, the sheet 31 forming the outer layer and the sheet 32 forming the inner layer, which form the outer covering element 3, are, as described above, non-stretch sheets that are not stretch. As used herein, the term “non-stretch sheet” refers to a sheet that has a degree of recovery after elongation as defined by the <Method for determining the degree of recovery after elongation> described above, which is 20% or less, or a sheet that is torn before the sheet will be stretched to a relative elongation of 100%.

[0063]

As the sheet 31 forming the outer layer and the sheet 32 forming the inner layer, which are non-stretch, non-woven materials made using various manufacturing methods can preferably be used. Examples include spunbond nonwovens, nonwovens held together by passing air through, and needle-punched nonwovens. The constituent fiber of nonwoven materials that can be used as non-stretch sheets 31 and 32 can be, for example, a fiber made from a complex polyester such as polyethylene (PE), polypropylene (PP), polyethylene terephthalate (PET) or polybutylene terephthalate (PBT) ), or polyamide. The fiber that forms nonwoven materials that can be used as non-stretch sheets 31 and 32 may be a staple fiber or a long fiber and may be hydrophilic or hydrophobic. You can also use a multicomponent fiber with a core and cladding or with the arrangement of components side by side, split fiber, fiber with a modified cross-section, crimped fiber, heat-shrinkable fiber, or the like. These fibers may be used alone or in combination of two or more.

[0064]

So far, the present invention has been described by means of a preferred embodiment of the present invention, but the present invention is not limited to the embodiment described above.

For example, in the above embodiment, protrusions 210 and recesses 211, which form an uneven surface structure of the upper sheet 21 facing the skin, are continuous along the entire length of the upper sheet 21 in the longitudinal direction X to form a structure with comb-like protrusions / grooves. However, the protrusions 210 and the recesses 211 do not necessarily form such a structure with ridge-shaped protrusions / grooves, and, in a word, it is only necessary that a plurality of recesses 211 that extend in the longitudinal direction X are located between the protrusions 210 and 210 adjacent in the lateral direction Y,

In addition, in the above embodiment, the top sheet 21 is provided so that it overlaps the portions 230 of the absorbent element 23 that are longitudinal end that are present in the contracting zones 35 of the outer covering element when viewed from above, and in each compressible zone 35 of the outer of the covering element, the surface of the upper sheet 21 facing the skin is covered by a hydrophobic sheet 31E, but such a configuration is not necessary in the present invention. However, as described above, with this configuration, in particular, due to the fact that the surface of the top sheet 21 facing the skin and having an uneven structure is covered by a hydrophobic sheet 31E, the problem of leakage of liquid secretions, such as urine, to the outside is more effectively prevented. through the recesses 211, which form an uneven structure.

In addition, in the above embodiment, the sheet 31 forming the outer layer is one continuous sheet, like the sheet 32 forming the inner layer, but may be a combination of many sheets.

In addition, the outer covering element 3 can be divided into a front zone of the outer covering element located in the front part, and a rear zone of the outer covering element located in the back part, and the absorbent assembly 2 can be secured so that it connects like the bridge, the front zone of the outer covering element and the rear zone of the outer covering element.

The following additional statements will be further disclosed in view of the above-described embodiment of the present invention.

[0065]

<1> A stretchable disposable diaper comprising:

a front part configured to be placed on the abdominal side of the user, a rear part configured to be placed on the dorsal side of the user, and a crotch part that is provided between the front part and the rear part,

wherein the pull-on disposable diaper has a longitudinal direction that extends from the front to the rear through the crotch portion, and a lateral direction that is perpendicular to the longitudinal direction, and

the pull-on disposable diaper further includes:

an absorbent assembly including an absorbent element and a top sheet that is provided on the surface side of the absorbent element facing the skin; and

an outer covering element, which is provided on the surface side of the absorbent assembly not facing the skin, and which fixes the absorbent assembly, and

both side edge parts of the outer covering element in the front and both side edge parts of the outer covering element in the back are bonded to form a waist hole and two leg openings,

wherein the outer covering element includes a sheet forming an outer layer that is located on a side that is relatively distant from the absorbent assembly, and a sheet forming an inner layer that is located on a side that is relatively close to the absorbent assembly, and additionally includes a stretchable part in at least one of the front part and the rear part, while the stretchable part is configured to stretch in the lateral direction,

a plurality of elastic elements located below the belt that are laterally stretched are provided with gaps in the longitudinal direction between the sheet forming the outer layer and the sheet forming the inner layer in the stretch portion so that part of the plurality of elastic elements located below the belt passes through the overlapping part, which overlaps the part of the absorbent element, end in the longitudinal direction, and intersects with the part, end in the longitudinal direction, in the lateral direction, if a third in the top view,

the stretch part is compressed laterally due to the compression of the elastic elements located below the belt in the stretch part to form a compressible zone of the outer covering element, and the compressible zone of the outer covering element has an uneven structure on the side of the surface facing the skin in which the protruding protruding parts and parts with grooves that extend in the longitudinal direction are alternately in the lateral direction,

at least one of the sheet forming the outer layer and the sheet forming the inner layer in the contracting area of the outer covering element has through holes that pass through it in the direction of its thickness in parts with grooves that are on the side that is outer in the longitudinal the direction with respect to the portion of the absorbent element, end in the longitudinal direction, and

on the surface of the top sheet facing the skin, a plurality of protrusions that protrude toward the skin of the user, and a plurality of recesses that are located between the protrusions adjacent in the lateral direction and extend in the longitudinal direction, are formed so that at least some of the many recesses are in the same places in the lateral direction as the parts with grooves in the compressible zone of the outer covering element.

[0066]

<2> A pull-on disposable diaper according to <1>,

in which the top sheet overlaps a portion of the absorbent element, end in the longitudinal direction, which is located in the contracting area of the outer covering element, when viewed from a top view.

<3> A pull-on disposable diaper according to <1> or <2>,

in which the absorbent element includes an absorbent core that contains absorbent material,

the top sheet includes a part that protrudes outward in the longitudinal direction from that part of the absorbent core that is end in the longitudinal direction, and

the protruding part of the upper sheet overlaps the elastic elements located below the waist when viewed from a top view.

<4> A pull-on disposable diaper according to any one of paragraphs <1> - <3>,

in which the through holes include a through hole, which is located between the part of the absorbent element, the end in the longitudinal direction, and one of the many located below the belt, elastic elements that are not blocked by the part of the absorbent element, the end in the longitudinal direction, and is closest to the part of the absorbent element, end in the longitudinal direction, when viewed from a top view.

<5> A pull-on disposable diaper according to any one of paragraphs <1> - <4>,

in which both the sheet forming the outer layer and the sheet forming the inner layer have a plurality of through holes, and at least some of the through holes of the sheet forming the outer layer and the sheet forming the inner layer overlap with each other.

<6> A stretchable disposable diaper according to any one of paragraphs <1> - <5>,

in which, in the contracting zone of the outer covering element, the sheet forming the outer layer and the sheet forming the inner layer are attached to each other in a plurality of bonded parts of the outer covering element, which are made at intervals both in the longitudinal direction and in the lateral direction, and

located below the belt, elastic elements are provided so that they do not pass through the fastened parts of the outer covering element.

<7> A pull-on disposable diaper according to <5> or <6>,

in which, in the contracting zone of the outer covering element, the sheet forming the outer layer and the sheet forming the inner layer are attached to each other in a plurality of bonded parts of the outer covering element, which are made at intervals both in the longitudinal direction and in the lateral direction, and

through holes pass through the bonded parts of the outer covering element in the thickness direction.

[0067]

<8> A pull-on disposable diaper according to any one of paragraphs <1> - <7>,

in which the sheet forming the outer layer further includes, in addition to a part that has the same shape and dimensions as the shape and dimensions of the sheet forming the inner layer, a front protruding part that protrudes on the side of the front part outward from the part of the sheet forming the inner a layer that is lateral in the longitudinal direction when the sheet forming the outer layer and the sheet forming the inner layer are stacked and the rear protruding portion that protrudes on the back side outward from the sheet portion, uyuschego inner layer, which is an end in the longitudinal direction.

<9> A pull-on disposable diaper according to <8>,

in which the front protruding part and the rear protruding part are each bent over the sheet forming the inner layer, so as to close both end parts in the longitudinal direction of the absorbent assembly, which is provided with its fixation on the sheet forming the inner layer, and fixed.

<10> A pull-on disposable diaper according to <8> or <9>,

in which in the contracting area of the outer covering element, the skin-facing surface of the top sheet is covered with a hydrophobic sheet, and

the hydrophobic sheet serves as a front protruding part or a rear protruding part.

[0068]

<11> A stretchable disposable diaper according to any one of paragraphs <1> - <9>,

in which in the contracting area of the outer covering element the skin-facing surface of the top sheet is covered by a hydrophobic sheet.

<12> A pull-on disposable diaper according to <10> or <11>,

in which the hydrophobic sheet is attached to the top sheet on the protrusions, but is not attached to the top sheet in the recesses.

<13> A pull-on disposable diaper according to <12>,

in which the bonded parts, in which the hydrophobic sheet and the top sheet are bonded, are made with gaps in the longitudinal direction.

<14> A pull-on disposable diaper according to any one of paragraphs <10> - <13>,

in which the part of the hydrophobic sheet, end on the inner side in the longitudinal direction, is a free end part, which is not attached to the top sheet.

<15> A stretchable disposable diaper according to any one of paragraphs <10> - <14>,

in which the hydrophobic sheet is made of non-woven material, which lends itself to stretching in the lateral direction.

<16> A stretchable disposable diaper according to any one of paragraphs <10> - <15>,

in which the hydrophobic sheet is attached to the top sheet at the tops of the protrusions, but is not attached to the top sheet in the recesses.

[0069]

<17> A stretchable disposable diaper according to any one of paragraphs <1> - <16>,

in which each of the front and rear parts is longitudinally divided into an area without an absorbent assembly in which an absorbent assembly is not provided, and a zone with an absorbent assembly that is located on the inside of the zone without an absorbent assembly in a longitudinal direction, and

located below the belt, elastic elements are provided both in the zone without the absorbent node, and in the zone with the absorbent node.

<18> A pull-on disposable diaper according to paragraph <17>,

in which a compressible zone of the outer covering member is formed over the entire area of each of the zone without the absorbent assembly and the zone with the absorbent assembly and is also formed on the overlapping portion of the zone with the absorbent assembly that overlaps the absorbent assembly when viewed from above.

[0070]

<19> A pull-on disposable diaper according to any one of paragraphs <1> - <18>,

in which the compressible zone of the outer covering element has an uneven structure on the side of the surface not facing the skin, in which the comb-like protruding parts and the parts with grooves that extend in the longitudinal direction are alternately made in the lateral direction.

<20> A pull-on disposable diaper according to <19>,

in which, in the contracting area of the outer covering member, the comb-like protruding parts on the side of the surface facing the skin and the comb-like protruding parts on the side of the surface not facing the skin are located in the same places in the lateral direction, and

parts with grooves on the side of the surface facing the skin, and parts with grooves on the side of the surface not facing the skin, are located in the same places in the lateral direction.

<21> A stretchable disposable diaper according to any one of paragraphs <1> - <20>,

in which each of both side edge parts of the outer covering element in the front part and both side edge parts of the outer covering element in the rear part are bonded to form two parts, which are side seams, and

a plurality of elastic elements located below the belt are attached both to the sheet forming the outer layer and to the sheet forming the inner layer, only in parts representing the side seams or in parts adjacent to parts representing the side seams, but not attached to both of these sheets in other parts.

<22> A stretchable disposable diaper according to any one of paragraphs <1> - <21>,

in which, when the diaper is in its natural or wearing state, each of the sheet forming the outer layer and the sheet forming the inner layer forms a plurality of folds that overlap the plurality of elastic elements located below the belt extending across them and pass continuously in the longitudinal direction,

folds serve as ridge-shaped protruding parts, and

the gaps between the folds adjacent in the lateral direction serve as parts with grooves.

[0071]

<23> A stretchable disposable diaper according to any one of paragraphs <1> - <22>,

in which in each of the parts with grooves, many through holes are made at intervals with a predetermined interval in the longitudinal direction.

<24> A stretchable disposable diaper according to any one of paragraphs <1> to <23>,

in which both the sheet forming the outer layer and the sheet forming the inner layer have many through holes, and all the through holes of the sheet forming the outer layer and the sheet forming the inner layer overlap with one-to-one correspondence with each other.

<25> A stretchable disposable diaper according to any one of paragraphs <1> - <24>,

in which, in the contracting zone of the outer covering element, the sheet forming the outer layer and the sheet forming the inner layer are attached to each other in a plurality of bonded parts of the outer covering element, which are made at intervals both in the longitudinal direction and in the lateral direction,

both the sheet forming the outer layer and the sheet forming the inner layer have many through holes, and

one of the through holes of the sheet forming the outer layer overlaps one of the through holes of the sheet forming the inner layer at the location of one of the bonded parts of the outer covering element.

<26> A stretchable disposable diaper according to any one of paragraphs <1> - <25>,

in which each of the through holes has a maximum length when viewed from a top view, preferably 1 mm or more, more preferably 1.5 mm or more, and preferably 5 mm or less, more preferably 4 mm or less.

<27> A stretchable disposable diaper according to any one of paragraphs <1> - <26>,

in which the number of through holes in the compressible zone of the outer covering element is preferably 1 or more, more preferably 2 or more and preferably 15 or less, more preferably 12 or less per unit area, representing the area of the square shape with a square side length of 10 mm when viewed from above.

<28> A pull-on disposable diaper according to any one of paragraphs <1> - <27>,

in which, as regards at least some of the plurality of recesses of the top sheet, the parts with grooves of the compressible zone of the outer covering element are on the extension lines of the recesses extending in the longitudinal direction.

<29> A stretchable disposable diaper according to any one of paragraphs <1> to <28>,

in which each of the many recesses on the surface of the upper sheet facing the skin is in one-to-one correspondence with the corresponding one of the many parts with grooves in the compressible area of the outer covering element and is in the same place in the lateral direction as the corresponding one of parts with grooves.

[0072]

<30> A stretchable disposable diaper according to any one of paragraphs <1> - <29>,

in which on the surface of the top sheet facing the skin, the dividing distance between the vertices of the protrusions adjacent to each other in the lateral direction is preferably 1.5 mm or more, more preferably 2 mm or more and preferably 5 mm or less, more preferably 4.5 mm or less.

<31> A pull-on disposable diaper according to any one of paragraphs <1> to <30>,

in which each of the recesses has a length in the longitudinal direction, preferably comprising 7 mm or more, more preferably 10 mm or more, and preferably 60 mm or less, more preferably 50 mm or less.

<32> A stretchable disposable diaper according to any one of paragraphs <1> - <31>,

in which the number located below the waist, elastic elements that are present in the front or rear, is preferably 10 or more, more preferably 12 or more and preferably 35 or less, more preferably 30 or less.

<33> A stretchable disposable diaper according to any one of paragraphs <1> - <32>,

wherein in the front or rear, the number of elastic elements located below the belt that extend through the part that overlaps the absorbent element and intersect the absorbent element in the lateral direction when viewed from above is preferably 1 or more and preferably 15 or less, more preferably 12 or less.

Industrial applicability

[0073]

According to the present invention, there is provided a stretchable disposable diaper that has very good breathability and can prevent leakage of liquid secretions while effectively preventing an increase in moisture and skin problems.

Claims (88)

1. A stretchable disposable diaper comprising: a front part configured to be placed on the abdominal side of the user, a rear part configured to be placed on the dorsal side of the user, and a crotch portion provided between the front part and the rear part, wherein the pull-on disposable diaper has a longitudinal direction extending from the front to the back through the crotch portion, and a lateral direction perpendicular to the longitudinal direction, and the pull-on disposable diaper further includes: an absorbent assembly including an absorbent element and a top sheet provided from a surface of the absorbent element facing the skin; and an outer covering element provided on the surface side of the absorbent assembly not facing the skin, and configured to fix the absorbent assembly, and both side edge parts of the outer covering element in the front and both side edge parts of the outer covering element in the back are bonded to form a waist hole and two leg openings, wherein the outer covering element includes a sheet forming an outer layer located on a side located at a relative distance from the absorbent assembly, and a sheet forming an inner layer located on a side located relative to the absorbent assembly, and further includes stretchable part in at least one of the front part and the rear part, while the stretchable part is configured to stretch in the lateral direction, a plurality of laterally stretched elastic elements extending laterally are provided with gaps in the longitudinal direction between the sheet forming the outer layer and the inner layer forming sheet in the stretch part such that a part of the plurality of elastic elements located below the belt passes through the overlapping part, which overlaps the part of the absorbent element, end in the longitudinal direction, and part of the set of elastic elements located below the belt intersects the end in the longitudinal systematic way portion in a lateral direction, when viewed in a top, the stretch part is capable of laterally compressing due to the compression of the elastic elements located below the belt in the stretch part to form a compressible zone of the outer cover element, and the compressible zone of the outer cover element has an uneven structure on the side of the surface facing the skin in which the crest-like protruding parts and parts with grooves extending in the longitudinal direction are alternately in the lateral direction, at least one of the sheet forming the outer layer and the sheet forming the inner layer in the contracting area of the outer covering element has through holes passing through it in the direction of its thickness in parts with grooves located on the side that is outer in the longitudinal direction with respect to to the longitudinal end portion of the absorbent element, and on the surface of the top sheet facing the skin, a plurality of protrusions protruding toward the skin of the user and a plurality of recesses located between protrusions adjacent in the lateral direction and extending in the longitudinal direction are formed so that at least a portion of the plurality of recesses located in the same places in the lateral direction as the parts with grooves in the compressible area of the outer covering element. 2. The diaper according to claim 1, in which the top sheet overlaps the longitudinally end portion of the absorbent element, which is located in the contracting area of the outer covering element, when viewed from a top view. 3. The diaper according to claim 1, in which the absorbent element includes an absorbent core that contains absorbent material, the top sheet includes a part that protrudes outward in the longitudinal direction from that part of the absorbent core that is end in the longitudinal direction, and the protruding part of the upper sheet overlaps the elastic elements located below the belt when viewed from above. 4. The diaper according to claim 1, in which the through holes include a through hole, which is located between the part of the absorbent element, the end in the longitudinal direction, and one of the many located below the belt of elastic elements, which is not blocked by the part of the absorbent element, the end in the longitudinal direction, and is closest to the part of the absorbent element end in the longitudinal direction when viewed from a top view. 5. The diaper according to claim 1, in which the sheet forming the outer layer and the sheet forming the inner layer have a plurality of through holes, and at least a portion of the through holes of the sheet forming the outer layer and the sheet forming the inner layer overlap with each other. 6. The diaper according to claim 1, in which, in the contracting zone of the outer covering element, the sheet forming the outer layer and the sheet forming the inner layer are attached to each other in a plurality of bonded parts of the outer covering element, which are made at intervals both in the longitudinal direction and in the lateral direction, and the elastic elements located below the belt are provided so that they do not pass through the fastened parts of the outer covering element. 7. The diaper according to claim 5, in which, in the contracting zone of the outer covering element, the sheet forming the outer layer and the sheet forming the inner layer are attached to each other in a plurality of bonded parts of the outer covering element, which are made at intervals both in the longitudinal direction and in the lateral direction, and through holes pass through the bonded parts of the outer covering element in the thickness direction. 8. The diaper according to claim 1, in which the sheet forming the outer layer further includes, in addition to a part that has the same shape and dimensions as the shape and dimensions of the sheet forming the inner layer, a front protruding part that protrudes on the side of the front part outward from the part of the sheet forming the inner a layer that is lateral in the longitudinal direction when the sheet forming the outer layer and the sheet forming the inner layer are stacked and the rear protruding portion that protrudes on the back side outward from the sheet portion, uyuschego inner layer, which is an end in the longitudinal direction. 9. The diaper according to claim 8, in which the front protruding part and the rear protruding part are each bent over the sheet forming the inner layer, so as to close both end parts in the longitudinal direction of the absorbent assembly, which is provided with its fixation on the sheet forming the inner layer, and fixed. 10. The diaper according to claim 8, in which in the contracting area of the outer covering element, the skin-facing surface of the top sheet is covered with a hydrophobic sheet, and the hydrophobic sheet serves as a front protruding part or a rear protruding part. 11. The diaper according to claim 1, in which in the contracting area of the outer covering element the skin-facing surface of the top sheet is covered by a hydrophobic sheet. 12. The diaper according to claim 10, in which the hydrophobic sheet is attached to the top sheet on the protrusions, but is not attached to the top sheet in the recesses. 13. The diaper according to claim 12, in which the bonded parts, in which the hydrophobic sheet and the top sheet are bonded, are made with gaps in the longitudinal direction. 14. The diaper according to claim 1, in which the part of the hydrophobic sheet, end on the inner side in the longitudinal direction, is a free end part, which is not attached to the top sheet. 15. The diaper according to claim 10, in which the hydrophobic sheet is made of non-woven material, which lends itself to stretching in the lateral direction. 16. The diaper according to claim 10, in which the hydrophobic sheet is attached to the top sheet at the tops of the protrusions, but is not attached to the top sheet in the recesses. 17. The diaper according to claim 1, in which each of the front and rear parts is longitudinally divided into an area without an absorbent assembly in which an absorbent assembly is not provided, and a zone with an absorbent assembly that is located on the inside of the zone without an absorbent assembly in a longitudinal direction, and the elastic elements located below the belt are provided both in the zone without the absorbent assembly and in the zone with the absorbent assembly. 18. The diaper according to claim 17, in which a compressible zone of the outer covering member is formed over the entire area of each of the zone without the absorbent assembly and the zone with the absorbent assembly and is also formed on the overlapping portion of the zone with the absorbent assembly that overlaps the absorbent assembly when viewed from above. 19. The diaper according to claim 1, in which the compressible zone of the outer covering element has an uneven structure on the side of the surface not facing the skin, in which the comb-like protruding parts and the parts with grooves that extend in the longitudinal direction are alternately made in the lateral direction. 20. The diaper according to claim 19, in which, in the contracting area of the outer covering member, the comb-like protruding parts on the side of the surface facing the skin and the comb-like protruding parts on the side of the surface not facing the skin are located in the same places in the lateral direction, and parts with grooves on the side of the surface facing the skin, and parts with grooves on the side of the surface not facing the skin, are located in the same places in the lateral direction. 21. The diaper according to claim 1, in which both side edge parts of the outer covering element in the front part and both side edge parts of the outer covering element in the back part are bonded to form two parts representing the side seams, and each of the plurality of elastic elements located below the belt is attached both to the sheet forming the outer layer and to the sheet forming the inner layer, only in parts representing the side seams, or in parts next to parts representing the side seams, but not attached to both of these sheets in other parts. 22. The diaper according to claim 1, in which, when the diaper is in its natural or wearing state, each of the sheet forming the outer layer and the sheet forming the inner layer forms a plurality of folds that overlap the plurality of elastic elements located below the belt, extending across them and extend continuously in the longitudinal direction folds serve as ridge-shaped protruding parts, and the gaps between the folds adjacent in the lateral direction serve as parts with grooves. 23. The diaper according to claim 1, in which in each of the parts with grooves, many through holes are made at intervals with a predetermined interval in the longitudinal direction. 24. The diaper according to claim 1, in which the sheet forming the outer layer and the sheet forming the inner layer have a plurality of through holes, and all the through holes of the sheet forming the outer layer and the sheet forming the inner layer overlap with one-to-one correspondence. 25. The diaper according to claim 1, in which, in the contracting zone of the outer covering element, the sheet forming the outer layer and the sheet forming the inner layer are attached to each other in a plurality of bonded parts of the outer covering element, which are made at intervals both in the longitudinal direction and in the lateral direction, the sheet forming the outer layer and the sheet forming the inner layer have many through holes, and one of the through holes of the sheet forming the outer layer overlaps one of the through holes of the sheet forming the inner layer at the location of one of the bonded parts of the outer covering element. 26. The diaper according to claim 1, in which each of the through holes has a maximum length when viewed from a top view of 1 mm or more and 5 mm or less. 27. The diaper according to claim 1, in which the number of through holes in the compressible zone of the outer covering element is 1 or more and 15 or less per unit area, which is the area of the square-shaped zone of 10 mm when viewed from above. 28. The diaper according to claim 1, in which relatively at least parts of the plurality of recesses of the top sheet of the grooved part of the contracting zone of the outer covering element are on the extension lines of the recesses extending in the longitudinal direction. 29. The diaper according to claim 1, in which each of the many recesses on the surface of the upper sheet facing the skin is in one-to-one correspondence with the corresponding one of the many parts with grooves in the compressible area of the outer covering element and is in the same place in the lateral direction as the corresponding one of the parts with grooves. 30. The diaper according to claim 1, in which on the surface of the upper sheet facing the skin, the dividing distance between the vertices of the protrusions adjacent to each other in the lateral direction is 1.5 mm or more and 5 mm or less. 31. The diaper according to claim 1, in which each of the recesses has a length in the longitudinal direction of 7 mm or more and 60 mm or less. 32. The diaper according to claim 1, in which the number of elastic elements located below the belt, which are present in the front or rear, is 10 or more and 35 or less. 33. The diaper according to claim 1, in which in the front or rear, the number of elastic elements located below the belt that pass through the part that overlaps the absorbent element and intersect the absorbent element in the lateral direction, when viewed from above, is 1 or more and 15 or less.

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