RU2713985C1 - Absorbent product - Google Patents

Abstract

FIELD: satisfaction of human vital needs.

SUBSTANCE: present invention relates to an absorbent article comprising a sweat absorbing sheet having a sweat soaking function. Hydrophobic sheet (11) is provided on the side farther from the user's skin than absorbing sheet (10) from absorbent element (23) to the outer side elongated part (3E) of elastic sheet (3) along longitudinal edge (23a) of absorbent element (23). Longitudinal inner edge (10b) of the absorbent perspiration of sheet (10) is located outside in the longitudinal direction (X) from the longitudinal inner edge (11b) of hydrophobic sheet (11), and hydrophobic sheet (11) partially overlaps with absorbing sweat sheet (10) in top view and has inner lateral elongated portion (11E) extending inwardly in longitudinal direction (X) from longitudinal inner edge (10b). In absorptive article (1) ratio of stretching force in lateral direction (Y) corresponds to condition region A < region B, where region A coincides in longitudinal direction (X) with absorbing sweat sheet (10), and region B coincides in longitudinal direction (X) with inner side additional part (11E).

EFFECT: object of the present invention is to provide an absorbent article comprising: a sweat absorbing sheet which softly comes into contact with skin and quickly absorbs sweat; and an absorbent member that absorbs the body fluid, but virtually does not let it out through the sweat absorbing sheet.

11 cl, 6 dwg

Description

FIELD OF THE INVENTION

[0001]

The present invention relates to an absorbent article including a sweat-absorbing sheet having a sweat-absorbing function.

BACKGROUND

[0002]

In conventional absorbent articles, such as a disposable diaper, a sweat-absorbing sheet containing a hydrophilic material capable of absorbing sweat is provided in that section that may come into contact with the skin of the wearer of the diaper to suppress the occurrence of skin problems, including pruritus.

[0003]

Patent Document 1 discloses a wear-on disposable diaper in which a hydrophilic sheet containing long fibers as a material having high water absorption capacity is provided as a sweat-absorbing sheet on a back end valve that extends outward from the end of the absorbent member. The hydrophilic fabric is provided so that it can come into contact with the skin of the user, and the valve of the rear end is provided on the side that is more remote from the skin of the user than the hydrophilic fabric. The valve of the rear end includes two sheet materials, and between these two sheet materials, elastic elements extending in the lateral direction of the diaper are provided in a stretched state at some intervals in the longitudinal direction. This structure allows the valve of the rear end to have lateral elasticity. According to Patent Document 1, sweat released at the user's waist is quickly absorbed by the hydrophilic sheet, as a result of which the waist of the user is kept dry with low humidity, and skin problems are unlikely to occur. Here, the longitudinal direction is a direction coinciding with the direction of the absorbent article extending from the front side through the crotch to the rear side of the user, while the lateral direction is the direction orthogonal to the longitudinal direction.

[0004]

Patent Document 2 discloses a sweat-absorbing sheet attached to a hydrophobic sheet that covers the inner surface of the front and back waist region in a disposable diaper. The hydrophobic sheet is larger in plan view than the sweat-absorbing sheet. The longitudinal inner edge of the sweat-absorbing sheet is located in the longitudinal direction outside of the longitudinal inner edge of the hydrophobic sheet, and the hydrophobic sheet has an inner lateral elongated portion extending inward in the longitudinal direction from the longitudinal inner edge of the sweat-absorbing sheet. The disposable diaper according to Patent Document 2 is structured so as not to impair the function of the sweat-absorbing sheet, which does not bend even when the unbound region of the hydrophobic sheet bends while wearing.

LIST OF REFERENCES

PATENT LITERATURE

[0005]

Patent Document 1: JP 2006-141549 A

Patent Document 2: JP 2007-259874 A

SUMMARY OF THE INVENTION

[0006]

The present invention is an absorbent article having a longitudinal direction and a lateral direction orthogonal to the longitudinal direction coinciding with the direction from the front side through the crotch to the rear side of the user. An absorbent article includes: a liquid retaining absorbent member; an elastic sheet located further from the skin of the user than the absorbent element, and having elasticity in the lateral direction; and a sweat-absorbing sheet having a hydrophilic region capable of absorbing sweat, and located in a section capable of contacting the skin of the wearer of the diaper. The elastic sheet has an outer lateral elongated portion extending outward in a longitudinal direction from the longitudinal edge of the absorbent element. The hydrophobic sheet is located on the elastic sheet so that the hydrophobic sheet is further away from the wearer's skin than the sweat-absorbing sheet, and the hydrophobic sheet extends from the absorbent member to the outer lateral elongated portion of the elastic sheet along the longitudinal edge of the absorbent member. The longitudinal inner edge of the sweat-absorbing sheet is located in the longitudinal direction outside of the longitudinal inner edge of the hydrophobic sheet. The hydrophobic sheet partially overlaps with the sweat-absorbing sheet in a plan view and has an inner lateral elongate portion extending inward in a longitudinal direction from a longitudinal inner edge of the sweat-absorbing sheet. The absorbent article includes: a region A that is located in the longitudinal direction in the same position as the sweat-absorbing sheet; as well as region B, which is located in the longitudinal direction in the same position as the inner lateral elongated part of the hydrophobic sheet, and region B has a greater tensile force in the lateral direction than region A.

BRIEF DESCRIPTION OF THE DRAWINGS

[0007]

[FIG. 1] FIG. 1 is a perspective view schematically showing a put on disposable diaper as one embodiment of an absorbent article.

[FIG. 2] FIG. 2 is an expanded plan view schematically showing the skin surface (inner surface) of the diaper shown in FIG. 1, in the expanded uncompressed state.

[FIG. 3] FIG. 3 is a sectional view schematically showing a cross section along line I-I of FIG. 2 (cross section along the lateral direction).

[FIG. 4] FIG. 4 is a sectional view schematically showing a cross-section along line II-II of FIG. 2 (cross section along the longitudinal direction).

[FIG. 5] FIG. 5 is a sectional view schematically showing an end portion of a longitudinal cross section of a diaper shown in FIG. 4.

[FIG. 6] FIG. 6 shows a put on disposable diaper as another embodiment of the absorbent article of the present invention corresponding to FIG. 2.

DESCRIPTION OF EMBODIMENTS

[0008]

In order to allow the sweat-absorbing sheet included in the absorbent article to absorb sweat, the sweat-absorbing sheet must come into contact with the skin of the user, but the sweat-absorbing sheet in close contact with the skin can damage it. In particular, when the sweat-absorbing sheet is provided at the edge of the absorbent element and the sweat-absorbing sheet is in close contact with the skin due to the compressive force of the area with the sweat-absorbing sheet, body fluids, including urine, absorbed by the absorbent element, can leak from the edge of the absorbent element and can leak through the sweat-absorbing sheet to the outside of the absorbent article.

[0009]

Therefore, the present invention seeks to provide an absorbent article comprising: a sweat-absorbing sheet that gently comes into contact with the skin and quickly absorbs sweat; and an absorbent element that absorbs body fluid, but practically does not pass it out through the sweat-absorbing sheet.

[0010]

The present invention will now be described based on its preferred embodiments with reference to the drawings. FIG. 1-4 show a put on disposable diaper 1 as one embodiment of an absorbent article of the present invention. The diaper 1, as shown in FIG. 1-4 has a longitudinal direction X coinciding with a direction extending from the front side through the crotch to the rear side of the user, and a lateral direction Y orthogonal to the longitudinal direction X. The diaper 1 has a crotch part M; the front part F extending in the longitudinal direction X from the front side of the crotch part M; and a rear portion R extending in the longitudinal direction X from the rear side of the crotch portion M. The diaper 1 includes a liquid retaining absorbent element 23 in the crotch portion M. The crotch part M is a section placed on the crotch of the wearer of the diaper 1, the front part F is the section located on the front side of the wearer of the diaper 1, that is, on the front side in the longitudinal direction X, and the rear part R is the section located closer to the rear side of the wearer of the diaper 1 than the crotch portion M, i.e., from the rear side in the longitudinal direction X.

[0011]

The diaper 1 includes: an absorbent assembly 2 including an absorbent element 23 in a central portion in a lateral direction Y; and an outer cover 3 provided on the non-skin surface of the absorbent assembly 2, i.e. farther from the wearer's body than the absorbent assembly 2. Both side edge parts FS, RS along the longitudinal direction X of the outer cover 3 in each of the front part F and the rear part Rs are connected by known bonding means, such as adhesive, heat sealing and ultrasonic welding, to form a pair of side seals S, S, a waist opening WH, through which the user's body passes, and a pair of leg openings LH, LH, through which The legs of the wearer pass as shown in FIG. 1.

[0012]

In the diaper 1 in its unfolded, uncompressed state, as shown in FIG. 2, the absorbent assembly 2 is rectangular in plan view and extends in the longitudinal direction X from the front F to the rear R. The absorbent assembly 2 is provided in the central part in the lateral direction Y of the outer cover 3 so that the length direction of the absorbent assembly 2 coincides with the longitudinal direction X of the diaper 1 in its unfolded, uncompressed state, and is connected to the outer coating 3 by means of an adhesive. “Unfolded uncompressed state” of the diaper 1 means a state in which the side seals S are cut to make the diaper 1 flat, and each elastic element of the diaper 1 in its unfolded state is stretched to structural dimensions (equal to the dimensions when the diaper is laid out on a plane, while while the effects of elastic elements are completely eliminated).

[0013]

The absorbent assembly 2, as shown in FIG. 3 includes a liquid permeable topsheet 21, which constitutes a skin-facing surface, a liquid impermeable, liquid-impervious or water-repellent bottom sheet 22, which constitutes a skin-non-skinable surface, and a liquid-retaining absorbent member 23 located between the sheets 21, 22, and is formed by combining these elements with a known bonding agent, such as an adhesive. The total length in the longitudinal direction X of the absorbent assembly 2 is the same as that of the absorbent member 23, and both longitudinal edges 23a, 23a coincide with the longitudinal edges of the absorbent assembly 2, as shown in FIG. 2.

[0014]

As used herein, a “skin-facing surface” is one surface of the absorbent article or its constituent element (eg, top sheet), and faces the skin of the wearer while wearing the absorbent article, or is a surface that is relatively close to the skin of the wearer, and “not reversed skin surface "is the other surface of the absorbent product or its constituent element, and is the surface opposite to the surface facing the skin of the user while wearing the absorbent product, or is a surface relatively remote from the skin of the user. As used herein, the phrase “while wearing” means a state in which a typical, suitable wearing position or normal wearing position of an absorbent article is maintained.

[0015]

As each of the top sheet 21, the bottom sheet 22, and the absorbent element 23, various materials conventionally used in such absorbent products can be used without any limitation. For example, various non-woven materials, porous films, and the like can be used as the top sheet 21, and a polymer film, a laminate, for example, of a polymer film and non-woven material, and the like can be used as the bottom sheet 22. The absorbent element 23 typically comprises an absorbent core including a layer of core-forming material containing absorbent material, and the outer surface of the absorbent core can be wrapped with a core-wrapping sheet, including a liquid-permeable sheet such as paper and non-woven materials. As the absorbent material, without limitation, materials commonly used as forming materials of such absorbent nuclei can be used, and examples thereof include wood pulp, hydrophilic fibers such as artificial fibers treated with a hydrophilizing agent, and water-absorbing polymer particles.

[0016]

As shown in FIG. 2 and FIG. 3, a pair of tight cuffs 24, 24 is provided on both sides along the longitudinal direction X on the skin-facing surface of the absorbent assembly 2 from a liquid-tight or water-repellent tight-cuff sheet 25 having air permeability. Near the free end of each dense cuff 24 in the longitudinal direction X in the extended state, at least one threadlike elastic cuff forming the cuff is provided. Each dense cuff 24 is located in at least part M of the crotch while wearing the diaper 1 by compressing the elastic member 26 provided in the stretched state, and this prevents the outflow of fluid, such as urine, from flowing outward in the lateral direction Y.

[0017]

The outer coating 3, as shown in FIG. 1, FIG. 2 and FIG. 4, is divided into a front panel 3F placed on the front side of the wearer of the diaper, and a rear panel 3R placed on its rear side. In other words, the diaper 1 includes a front panel 3F placed on the front side of the user, a rear panel 3R placed on the rear side of the user, and an absorbent assembly 2 that connects the panels 3F, 3R is attached to them, and is oblong in the longitudinal direction .

[0018]

Each of the front panel 3F and the rear panel 3R includes an outer sheet 31 forming their non-skin surface, that is, forming the outer surface of the diaper 1, an inner sheet 32 provided on the side of the inner surface of the outer sheet 31, and a plurality of filiform or continuous waist elastic elements 33 fixed between sheets 31, 32 by an adhesive (not shown), and has a rectangular shape, elongated in the lateral direction Y in the unfolded state of the diaper 1 shown in FIG. 2. The outer sheet 31 and the inner sheet 32 included in each of the front panel 3F and the rear panel 3R have the same shape and the same size in a plan view. The sheets 31, 32 are joined together in predetermined positions by an adhesive (not shown). In each of the front panel 3F and the rear panel 3R, as shown in FIG. 2, a plurality of waist elastic members 33 are stretched in the lateral direction Y and at some intervals in the longitudinal direction X, and are fixed to both sheets 31, 32 by means of a connecting means, such as hot melt adhesive. The waist elastic elements 33 are arranged in a stretched state as described above, and thus substantially continuous, annular waist folds are formed around the entire circumference of the edge of the waist opening WH.

[0019]

In the section with the absorbent member 23 in each of the front panel 3F and the rear panel 3R, more specifically, in the section with the absorbent assembly 2, the waist elastic members 33 have lower elasticity due to disruption of the processing, such as cutting and heating. In other words, in the diaper 1 in a plan view, as shown in FIG. 2, the absorbent member 23 (absorbent assembly 2) overlaps with the lateral central portion 3M of the outer cover 3 (front panel 3F, rear panel 3R), and the lateral central portion 3M of the outer coating 3 has lower elasticity than both lateral portions 3S, 3S of the outer a coating 3 located outside the lateral central portion 3M and not overlapping with the absorbent member 23 (absorbent assembly 2). The lateral central portion 3M of the outer cover 3 may not be elastic or may have weak lateral elasticity Y due to the residual elasticity of the waist elastic elements 33 after the elasticity-breaking treatment. A weakly elastic region is formed in the lateral central part 3M, which overlaps with the absorbent assembly 2, in the outer cover 3, as described above, and thus each edge in the longitudinal direction X of the absorbent assembly 2 can abut against the user's body without longitudinal folds on the absorbent assembly 2 including an absorbent member 23. This effectively prevents leakage and effectively suppresses inconvenience, including traces of creased vertices that could form on the absorbent assembly 2 and come into contact with the skin.

[0020]

The outer sheet 31 and the inner sheet 32 may be of the same type, or may be of different types. Examples of the latter case include sheets having differing elasticities. In particular, for example, an elastic sheet having lateral elasticity Y can be used as the outer sheet 31, and a non-elastic sheet not having elasticity can be used as the inner sheet 32. Examples of the elastic sheet used as the outer cover 3, include an elastic sheet in which a stretch fiber layer is integrated on both sides or on one side of the elastic fiber layer. Examples of a method for integrating a layer of elastic fiber and a layer of stretchable fiber include a method for hydraulically entangling their laminate, a method for entangling the fibers by blowing air and the like, as well as a method of bonding with heat embossing, adhesive, ultrasound, and the like. Examples of the inelastic sheet used as the outer cover 3 include non-woven materials produced by various methods, and in particular include spunbond non-woven fabric, blow-off non-woven fabric and needle-punched non-woven fabric.

[0021]

As mentioned above, in the present embodiment, the outer cover 3 (front panel 3F, rear panel 3R) is provided further from the skin of the wearer of the diaper 1 of the user than the absorbent element 23. The outer cover 3, which includes waist elastic elements 33, fixed in stretched state in the lateral direction Y, has elasticity in the lateral direction Y, and is an elastic sheet having elasticity in the lateral direction. The outer coating 3 as an elastic sheet, as shown in FIG. 2, has in each of the front part F and the rear part R an external lateral elongated part 3E extending outward in the longitudinal direction X from the longitudinal edge 23a of the absorbent member 23.

[0022]

In the present description, "elastic" means the property of extensibility in a predetermined direction and compression after tension release. A sheet essentially lacking elasticity (being inelastic) in a certain direction means that the sheet practically does not stretch even when a tensile force is applied to it in a certain direction. For example, when a specimen having a length of 15 cm and a width of 5 cm is stretched in the length direction using a dynamometer such as Tensilon, and the specimen breaks when the fracture elongation is 10% or less, such a specimen is substantially non-elastic in the length direction. The fracture elongation can be calculated in accordance with the formula (the length of the sample at break is the original length of the sample) / (initial length of the sample) × 100.

[0023]

In that section of the diaper 1 which comes into contact with the skin of the wearer of the diaper, a sweat-absorbing sheet 10 is provided having a hydrophilic region capable of absorbing sweat. Sweat-absorbing sheet 10, primarily used to absorb sweat around the user's waist, is provided in the diaper 1 on each skin-facing surface of the front part F (front panel 3F) and rear part R (rear panel 3R), outward in the longitudinal direction X from an imaginary a straight line (not shown) dividing the front part F or the rear part R in the longitudinal direction X into two parts, i.e. closer to the waist opening WH than this imaginary straight line, and as close to the skin of the wearer of the diaper 1 user, as shown but in FIG. 1, FIG. 2 and FIG. 4. The sweat-absorbing sheet 10 has a shape that is oblong in one direction in a plan view, in particular a rectangular shape (continuous shape), and is provided along the entire length in the lateral direction Y of each of the front part F and the back part R, while the length direction coincides with the lateral direction Y. An absorbent sweat sheet 10 is provided along the corresponding longitudinal edge 23a of the absorbent element 23 and overlaps with the longitudinal edge. The sweat-absorbent sheet 10 has a longitudinal outer edge 10a relatively close to the waist hole WH, and a longitudinal inner edge 10b relatively remote from the waist hole WH, and both longitudinal edges 10a, 10b extend parallel to the lateral direction Y. The longitudinal outer edge 10a of the absorbent the sweat of the sheet 10 is located outside in the longitudinal direction X from the longitudinal edge 23a of the absorbent element 23, and the longitudinal inner edge 10b of the absorbent sweat of the sheet 10 is located inside in the longitudinal direction X of the longitudinal edge 23a of absorbed vayuschego member 23.

[0024]

FIG. 5 shows a cross section along the longitudinal direction X of the end portion in the longitudinal direction X of the front portion F of the diaper 1. In some cases, the sweat-absorbing sheet 10 in the front portion F of the diaper 1 is mainly described, but this description also applies to the rear portion R, if explicitly not specified otherwise.

[0025]

As shown in FIG. 4 and FIG. 5, from a side farther away from the wearer's skin than the sweat-absorbing sheet 10, that is, on the non-skin surface, a hydrophobic sheet 11 is provided, and no sweat is absorbed from the absorbent member 23 to the corresponding outer lateral elongated portion 3E of the outer coating 3 (front panel 3F, rear panel 3R) as an elastic sheet along the longitudinal edge 23a of the absorbent member 23. A hydrophobic sheet 11, intended primarily to prevent the problem of leakage of body fluid outward, so like urine absorbed by the absorbent element 23, through the sweat-absorbing sheet 10, is provided in the diaper 1 on each skin-facing surface of the front part F (front panel 3F) and the rear part R (rear panel 3R), outward in the longitudinal direction X from an imaginary a straight line (not shown) dividing the front part F or the rear part R in the longitudinal direction X into two parts, i.e. closer to the waist hole WH than this imaginary straight line, and is provided on the sweat-absorbing sheet surface 10 in provisions and shown in FIG. 1, FIG. 2 and FIG. 4. The hydrophobic sheet 11 has the same flat shape as the sweat-absorbing sheet 10, elongated in one direction in a plan view, in particular a rectangular shape (continuous shape). A hydrophobic sheet 11 is provided along the entire length in the lateral direction Y of each of the front part F and the rear part R so that the length direction of the hydrophobic sheet 11 coincides with the lateral direction Y. The hydrophobic sheet 11 is provided along the corresponding longitudinal edge 23a of the absorbent element 23 and overlaps with longitudinal edge. The hydrophobic sheet 11 has a longitudinal outer edge 11a relatively close to the waist hole WH, and a longitudinal inner edge 11b relatively remote from the waist hole WH, and both longitudinal edges 11a, 11b extend parallel to the lateral direction Y. The longitudinal outer edge 11a of the hydrophobic sheet 11 is located externally in the longitudinal direction X from the longitudinal edge 23a of the absorbent element 23, and the longitudinal inner edge 11b of the hydrophobic sheet 11 is located inside in the longitudinal direction X from the longitudinal edge 23a of the absorbent element 23.

[0026]

As shown in FIG. 4 and FIG. 5, the longitudinal inner edge 10b of the sweat-absorbing sheet 10 is located externally in the longitudinal direction X from the longitudinal inner edge 11b of the hydrophobic sheet 11, i.e. closer to the waist opening WH. The hydrophobic sheet 11 partially overlaps with the sweat-absorbing sheet 10 in a plan view, as shown in FIG. 2, and has an inner lateral elongated portion 11E extending inward in the longitudinal direction X from the longitudinal inner edge 10b of the sweat-absorbing sheet 10.

[0027]

As shown in FIG. 2 and FIG. 5, the diaper 1 includes: a region A that is located in the longitudinal direction X in the same position as the sweat-absorbing sheet 10; as well as region B, which is located in the longitudinal direction X in the same position as the inner lateral elongated portion 11E of the hydrophobic sheet 11, and region B has a greater tensile force in the lateral direction Y than region A. Tensile force in the lateral direction Y correlates with the tightening of the diaper 1 on the wearer, and a greater tensile force in the lateral direction Y indicates a greater degree of tightening. Therefore, in the diaper 1, in which the correlation of the tensile force in the lateral direction Y corresponds to the condition region A <region B, as mentioned above, region B, which is adjacent to region A in the longitudinal direction X and has no sweat-absorbing sheet 10, but has a hydrophobic sheet 11 (inner lateral elongated portion 11E), it draws the user more strongly than the sweat-absorbing region of the sheet 10. The tensile force is measured in the following manner.

[0028]

<Method of measuring tensile force>

The diaper 1 is laid out on a plane and cut along straight lines parallel to the lateral direction Y of the diaper 1, in order to obtain regions A, B (region A includes region A1, A2, described below. The same applies hereinafter) as samples for measuring. When cutting, not only the outer cover 3 is cut, but also the entire diaper 1, including the absorbent assembly 2, etc. The corresponding ends in the length direction (lateral Y direction) of each measurement sample (inside the side seals S) are fixed in the clamps of the ORIENTEC universal Tensilon tester (RTC-1210A), and then the measurement sample is stretched in the length direction at a speed of 300 mm / min, and the tensile force of the sample is measured. In particular, the sample is stretched until the length reaches 80 (for example, 280 mm), where the inner dimension of the outer cover 3 (the length between the pair of side seals S, S is in such a state that the sheets 31, 32 of the outer cover 3 are not compressed elastic elements 33) is 100 (for example, 350 mm), and then it is allowed to compress until the length reaches 71 (for example, 250 mm), and the tensile load (cN) is measured as the tensile force of the sample. The tensile force of the measurement sample, that is, the tensile force of each of the regions A1, B, is converted to a specific value per unit length in the length direction (in the lateral direction Y) of each region, and is accordingly calculated as the average tensile force.

The reason that the return force at a length of 71, when the inner size of the outer cover is 100, is defined as the tensile force of the measurement sample (areas A1, B), is because the waist length of the child who is the typical owner of such a worn diaper as diaper 1 is approximately 71% of the internal size of the diaper. Here, the waist length is the average of the lengths measured in a standing position and a sitting position, taking into account variations in the length of the waist when the child’s posture changes.

[0029]

In the diaper 1 having the structure as described above, the sweat-absorbing sheet 10 is provided as close as possible to the skin of the wearer of the diaper 1 of the user, in the section corresponding to the waist of the user, on the skin-facing surface of each of the front part F and the back part R. External coating 3 (front panel 3F, rear panel 3R) as an elastic sheet having lateral elasticity Y is provided on the side farther from the skin of the user than the absorbent member 23 (absorbent assembly 2) in each of the front part F and the back part R. Therefore, while wearing the diaper 1, the tightening resulting from the compressive force of the outer cover 3 allows the absorbent sweat sheet 10 to come into contact with the skin with satisfactory fit properties and the sweat released from the skin, can be quickly absorbed and vaporized.

[0030]

Sweat-absorbing sheets 10 are provided in sections capable of matching the waist of the user, as mentioned above, and therefore sweat-absorbing sheets 10 in the diaper 1 are provided along the respective longitudinal edges 23a of the absorbent element 23, as shown in FIG. 2, FIG. 4 and FIG. 5. If no hydrophobic sheets 11 are provided, then the sweat-absorbing sheets 10 are provided so that they are in direct contact with the absorbent assembly 2 along the respective longitudinal edges 23a of the absorbent member 23, and the sweat-absorbing sheets 10 come into contact with the skin of the user due to the compressive forces of the outer coating 3, a body fluid such as urine absorbed by the absorbent element 23 can flow out from the longitudinal edges 23a and seep through the sweat-absorbing sheets 10 to the outside of the diaper 1. In the diaper 1, however, each An electrophobic sheet 11 is provided on the non-skin surface of the corresponding sweat-absorbing sheet 10, that is, on the surface facing the absorbent assembly 2, from the absorbent member 23 to the corresponding outer lateral elongated portion 3E of the outer coating 3 as an elastic sheet along the longitudinal edge 23a of the absorbent member 23. Therefore, even when the body fluid flows out from the longitudinal edge 23a, the flow of body fluid is prevented from spreading in the plane direction by the hydrophobic sheet 11, and samples The fact that the body fluid comes into contact with and flows through the absorbent sweat sheet 10 is effectively suppressed.

[0031]

In the diaper 1, the longitudinal inner edge 10b of the sweat-absorbing sheet 10 is located outside in the longitudinal direction X from the longitudinal inner edge 11b of the hydrophobic sheet 11, and the hydrophobic sheet 11 has an inner lateral elongated portion 11E extending inward in the longitudinal direction X from the longitudinal inner edge 10b. Therefore, the longitudinal edge 23a of the absorbent element 23 as a source of the leakage liquid and its surroundings are covered with a hydrophobic sheet 11, and thus the leakage resulting from the leakage of the liquid absorbed by the absorbent element 23 is effectively suppressed.

[0032]

If sweat-absorbing sheets 10 are in close contact with the skin of the wearer of the diaper 1 of the user, the skin may be damaged. In the diaper 1, as mentioned above, the correlation of the lateral tensile force Y corresponds to the condition region A <region B in each of the front part F and the back part R, and accordingly, the region with sweat-absorbing sheet 10 is relatively softly pressed against the skin, and the region B, not having a sweat-absorbing sheet 10, but having an inner lateral elongated portion 11E of the hydrophobic sheet 11, is relatively strongly pressed against the skin. Therefore, the sweat-absorbing sheet 10 in region A is in soft contact with the skin and is unlikely to damage the skin, while the inner lateral elongated portion 11E of the hydrophobic sheet 11 in region B is in fairly tight contact with the skin and effectively suppresses the problem of liquid sticking to the skin, flowing from the longitudinal edge 23a of the absorbent member 23. In the region A near the inner side extension 11E of the hydrophobic sheet 11 in the region B, sweat-absorbing sheet 10 is provided closer to the skin of the user than the inner lateral elongated portion 11E of the hydrophobic sheet 11. Therefore, even when the tightening in region B is strong to some extent, the inner lateral elongated portion 11E of the hydrophobic sheet 11 is in contact with such a force so as not to damage the skin.

[0033]

Due to the combination of the above-mentioned beneficial effects, the absorbent sweat sheet 10 is in gentle contact with the skin and quickly absorbs the sweat, and the diaper 1 is unlikely to cause a problem that the body fluid absorbed by the absorbent element 23 will flow out through the absorbent sweat sheet 10, thus reaching "Softness to the skin."

[0034]

In order to more confidently exhibit the above-mentioned beneficial effects, each part of the diaper 1 should preferably have the following dimensions and the like.

The length in the longitudinal direction X of the sweat-absorbing sheet 10 (the length in the width direction orthogonal to the length direction of the sweat-absorbing sheet 10, i.e. the width) is preferably 20 mm or more, more preferably 30 mm or more, and preferably 100 mm or less, more preferably 80 mm or less.

The length in the longitudinal direction X (width) of the hydrophobic sheet 11 is preferably 20 mm or more, more preferably 30 mm or more, and preferably 100 mm or less, more preferably 80 mm or less.

The lateral length Y, that is, the length in the length direction of the sweat-absorbing sheet 10, is preferably 40% or more, more preferably 70% or more, and at most 100% of the total length in the same direction of the diaper 1, provided that the sweat-absorbing sheet 10 is located in the central part in the lateral direction Y of the diaper 1 (front part F, rear part R) (in the side center part 3M of the outer cover 3).

The lateral length Y, that is, the length in the length direction of the hydrophobic sheet 11, is preferably 110% or more, more preferably 120% or more, and preferably 300% or less, more preferably 250% or less of the total length in the same the direction of the absorbent element 23, and the upper limit is 100% of the full length in the same direction of the diaper 1, provided that the hydrophobic sheet 11 is located between the absorbent element 23 and the sweat-absorbing sheet 10 along the longitudinal edge 23a of the absorbent element 23.

The length in the longitudinal direction X of the inner side extension 11E of the hydrophobic sheet 11, i.e., the length of region B, is preferably 3 mm or more, more preferably 5 mm or more, and preferably 25 mm or less, more preferably 15 mm or less.

[0035]

The bulk of the sweat-absorbing sheet 10 is preferably 5 g / m ² or more, more preferably 8 g / m ² or more, and preferably 50 g / m ² or less, more preferably 40 g / m ² or less.

The thickness of the sweat-absorbing sheet 10 is preferably 0.05 mm or more, more preferably 0.1 mm or more, and preferably 1 mm or less, more preferably 0.8 mm or less.

The bulk of the hydrophobic sheet 11 is preferably 5 g / m ² or more, more preferably 8 g / m ² or more, and preferably 30 g / m ² or less, more preferably 20 g / m ² or less.

The thickness of the hydrophobic sheet 11 is preferably 0.05 mm or more, more preferably 0.1 mm or more, and preferably 0.8 mm or less, more preferably 0.6 mm or less.

Each of the thicknesses of the sweat-absorbing sheet 10 and the hydrophobic sheet 11 is measured using a thickness gauge with a load of 0.05 kPa applied to the measured sheet. A laser displacement meter manufactured by Omron Corporation is used as a thickness gauge. Thickness is measured at any 10 points on the sheet, and the average is calculated as the thickness of the sheet.

[0036]

The ratio of the lateral tensile force Y of region B to the lateral tensile force Y of region A is preferably 1.04 or more, more preferably 1.06 or more, and preferably 2 or less, more preferably 1.8 or less.

The lateral tensile force Y of region A is preferably 0.006 N / mm or more, more preferably 0.008 N / mm or more, and preferably 0.055 N / mm or less, more preferably 0.045 N / mm or less, provided that the tensile force region A <tensile force of region B.

The lateral tensile force Y of region B is preferably 0.008 N / mm or more, more preferably 0.01 N / mm or more, and preferably 0.07 N / mm or less, more preferably 0.06 N / mm or less, provided that the tensile force of region A <the tensile force of region B.

[0037]

Each of the tensile forces (elasticities) in the lateral direction Y of region A and region B can be adjusted by appropriately controlling the number of waist elastic elements 33 provided in region A, region B and their vicinity, thickness of elastic elements 33, spacing between elastic elements 33, the type (elasticity) of the sheet element to which the elastic elements 33 are attached, that is, the outer sheet 31 and the inner sheet 32, and the like.

[0038]

In the diaper 1, each sweat-absorbing sheet 10 has an outer lateral elongated portion 10E extending outward in the longitudinal direction X from the corresponding longitudinal outer edge 11a of the hydrophobic sheet 11, as shown in FIG. 4 and FIG. 5. This structure increases the sweat-absorbing area and improves the air permeability. Therefore, the effect of sweat absorption and quick drying provided by the sweat-absorbing sheet 10 can be further improved.

For a more reliable manifestation of these beneficial effects, the length in the longitudinal direction X of the outer lateral elongated portion 10E of the sweat-absorbing sheet 10 (corresponding to the length in the longitudinal direction X of the region A1 to be described later) is preferably 3 mm or more, more preferably 5 mm or more, and preferably 50 mm or less, more preferably 40 mm or less.

[0039]

In the diaper 1, the sweat-absorbing sheet 10 is connected in the outer lateral elongated portion 10E to the additional portion 3E of the outer cover 3 as an elastic sheet, and also connected in the portion close to the outer lateral elongated portion 10E of the sweat-absorbing leaf 10 with the hydrophobic sheet 11. B As the connecting means of the sweat-absorbing sheet 10, the outer lateral elongated portion 3E of the outer coating 3 and the hydrophobic sheet 11, known connecting means such as adhesive, heat sealing and ultrasound can be used th welding. FIG. 5 shows a state in which the outer lateral elongated portion 10E of the sweat-absorbing sheet 10 and the outer lateral elongated portion 3E of the outer coating 3 are connected with an adhesive 12. The absorbent sweat sheet 10 is connected to the hydrophobic sheet 11 together with the additional portion 3E of the outer coating 3 as an elastic sheet as described above, and thus, the adherence properties of the sweat-absorbing sheet 10 to the skin are improved while wearing the diaper 1, and the effect of sweat absorption and quick drying provided by the sweat-absorbing 100, can be further improved. The connected region of the sweat-absorbing sheet 10, the outer lateral elongated portion 3E of the outer coating 3 and the hydrophobic sheet 11 (adhesive 12 in FIG. 5) may extend along the lateral direction Y of the sweat-absorbing sheet 10, or may be intermittently provided in the same direction.

[0040]

In the diaper 1, as mentioned above, the absorbent member 23 (absorbent assembly 2) overlaps with the lateral center portion 3M of the outer cover 3 (the front panel 3F, the rear panel 3R), which is an elastic sheet, and the lateral center portion 3M has a lower elasticity, than both side parts 3S, 3S of the outer cover 3. With this structure, wrinkles of the absorbent element 23 are unlikely to form, and thus the skin-sticking properties and the sweat-absorbing and quick-drying effect provided by the sweat-absorbing sheet 10 can be further improved.

[0041]

As shown in FIG. 5, region A includes: region A1, which is located in the same position as the outer lateral elongated portion 10E of the sweat-absorbing sheet 10 in the longitudinal direction X; as well as region A2, which is a region different from region A1, that is, a region overlapping with the hydrophobic sheet 11 of region B, which has no sweat-absorbing sheet 10, but has a hydrophobic sheet 11 (inner lateral elongated portion 11E), and preferably has a greater tensile force in the lateral direction Y than region A1. Under this condition, region A1 <region B in terms of tensile force, the above-mentioned beneficial effects due to the fact that region A <region B are further enhanced, and the adhesion properties of the sweat-absorbing sheet 10 to the skin, the effect of sweat absorption and quick drying provided by the absorbent sweat sheet 10, and the effectiveness of leakage protection by the hydrophobic sheet 11 is further improved. In addition to this, these elements are not in strong contact with the skin, and thus softness to the skin is more reliably achieved. The tensile force of each part for region A <region B can be adjusted in essentially the same way as for region A1 <region B, which was described above.

[0042]

The ratio of the lateral tensile force Y of region B to the lateral tensile force Y of region A1 is preferably 1.06 or more, more preferably 1.08 or more, and preferably 2.2 or less, more preferably 2 or less.

The lateral tensile force Y of the region A1 is preferably 0.005 N / mm or more, more preferably 0.0075 N / mm or more, and preferably 0.05 N / mm or less, more preferably 0.04 N / mm or less, provided that the tensile force of region A1 <the tensile force of region B.

[0043]

In order to improve the adhesion properties of the sweat-absorbing sheet 10 to the skin, the sweat-absorbing and quick drying effect provided by the sweat-absorbing sheet 10 and the leakage protection effect of the hydrophobic sheet 11, as well as to achieve softness to the skin, is a particularly preferred embodiment of the correlation of tensile forces in the lateral direction Y in each of the front part F and the rear part R is such that in each of the front part F and the rear part R, tensile forces in the lateral direction Y in decreasing order located as follows: Region B, the area A2 and the area A1, that is, the tensile force in the lateral direction Y of the area B is the maximum, and the tensile force in the Y direction of the region A1 side is minimal.

[0044]

The ratio of the lateral tensile force Y of region B to the lateral tensile force Y of region A2 is preferably 1.02 or more, more preferably 1.04 or more, and preferably 1.8 or less, more preferably 1.6 or less.

The ratio of the lateral tensile force Y of the region A2 to the lateral tensile force Y of the region A1 is preferably 1.04 or more, more preferably 1.06 or more, and preferably 2 or less, more preferably 1.8 or less.

The lateral tensile force Y of the region A2 is preferably 0.007 N / mm or more, more preferably 0.009 N / mm or more, and preferably 0.06 N / mm or less, more preferably 0.05 N / mm or less, provided that the tensile force of the region A1 <the tensile force of the region A2 <the tensile force of the region B.

[0045]

As a sweat-absorbing sheet of the present invention, a sheet having a hydrophilic region capable of absorbing sweat can be used. The "sweat" absorbed by the sweat-absorbing sheet of the present invention contains 99% by weight or more of water, and thus the sweat-absorbing sheet must have a hydrophilic region in order to allow the sweat-absorbing sheet in the absorbent article to exhibit sufficient sweat absorption efficiency in practice. The sweat absorbent sheet of the present invention may be completely hydrophilic or may partially have a hydrophilic region. When the sweat-absorbing sheet of the present invention partially has a hydrophilic region, this hydrophilic region can be located in any position, and may be discontinuously located in the plane direction of the sweat-absorbing sheet. Alternatively, one face, for example, a sweat-absorbing sheet surface facing the skin, may be a completely hydrophilic region, and the other side, for example, a skin-not facing surface of the sweat, may be a completely non-hydrophilic region, i.e. a hydrophobic region.

[0046]

In the present invention, the determination of whether a sheet or a partial region thereof is hydrophilic or hydrophobic is based on the edge angle of the fibers, as measured by the following method. In particular, fibers having a contact angle of less than 90 degrees are hydrophilic, while fibers having a contact angle of not less than 90 degrees are hydrophobic. Fibers having a lower contact angle have higher hydrophilicity (lower hydrophobicity), while fibers having a larger contact angle have lower hydrophilicity (higher hydrophobicity), where the contact angle is measured in the following manner. For example, in the aforementioned diaper 1, the hydrophilic region of the sweat-absorbing sheet 10 is a region having a fiber edge angle of less than 90 degrees, as measured by the following method. In contrast, the entire hydrophobic sheet 11 has a fiber edge angle of not less than 90 degrees, as measured by the following method.

[0047]

<Method of measuring the contact angle>

The measured sheet (non-woven material) is set so that the cross section along the thickness direction is facing up, then a plurality of fibers in the section from the outer surface of the sheet in the thickness direction to 1/10 of the sheet thickness are randomly selected, and the angles for water are measured. As a measuring device, an automatic MCA-J edge angle meter manufactured by Kyowa Interface Science Co., Ltd. is used. Distilled water is used to measure edge angles. The amount of liquid discharged from the water droplet discharge device such as an ink jet printer head (manufactured by Cluster Technology Co., Ltd., a CTC-25 pulse injector having an opening size of 25 μm) is set to 15 pl, and a water droplet drips directly above the center each fiber. This process is recorded using a high-speed video recorder connected to a horizontal camera. From the point of view of subsequent image analysis, the video recorder is preferably a personal computer integrated with a high-speed camera. When measuring, images are recorded every 17 ms. Of the recorded images, the first image in which a water droplet reaches the fiber is subjected to image analysis using FAMAS software (version 2.6.2; the analytical method is a droplet; the analytical method is θ / 2; the image processing algorithm is non-reflective; the image processing mode is frame ; the threshold value is 200; without correcting the curvature) in order to calculate the angle between the surface of the water droplet in contact with air and the fiber, and to obtain the contact angle. Each fiber is cut to a length of approximately 1 mm, and the cut fiber is placed on the stage of the edge angle meter and held horizontally. The edge angles for five fibers are measured with an accuracy of one decimal place, and the arithmetic average of the measured values in 10 places (rounded to the nearest whole) is defined as the edge angle. A lower contact angle indicates a higher hydrophilicity. The measuring medium has a room temperature of 22 ± 2 ° C and a relative humidity of 65 ± 2%.

[0048]

When a constituent element (for example, an absorbent sweat sheet) must be removed from the absorbent article and subjected to measurement and evaluation, but this constituent element is attached to other constituent elements by adhesive or fusion, the non-attached part is measured, or the fixing part is removed, and then the sample is removed . In this case, in order to minimize the effect on the hydrophilizing agent applied to the constituent element, it is preferable that the method of removing the fixing part is not in such a way as solvent coating and hot air blowing, which can degrade or destroy the hydrophilizing agent.

[0049]

The sweat absorbent sheet of the present invention typically includes a nonwoven fabric as a main component. As the non-woven material included in the sweat-absorbing sheet of the present invention, any non-woven material used as a constituent element of an absorbent article such as a top sheet and produced by various methods can be used without any restrictions, and examples include non-woven material, non-woven fabricated by combing technology, non-woven fabricated by spunbond technology, non-woven fabric aerodynamically sprayed from melt, manufactured by spunbond technology dc non-woven fabric and needle-punched nonwoven.

[0050]

When the absorbent sweat sheet of the present invention has a hydrophilic region including hydrophilic fibers, and has a region different from the hydrophilic region, i.e. the hydrophobic region, the hydrophobic region includes hydrophobic fibers. The sweat absorbent sheet of the present invention preferably includes both hydrophilic fibers and hydrophobic fibers.

[0051]

As hydrophobic fibers used in the absorbent sweat sheet of the present invention, fibers made from various thermoplastic resins (hot-melt fibers) can be used. Examples of the thermoplastic resin include polyolefins, such as polyethylene and polypropylene; polyester such as polyethylene terephthalate; polyamides such as nylon 6 and nylon 66; as well as polyacrylic acid, polyalkyl methacrylate, polyvinyl chloride and polyvinylidene chloride, and these resins can be used individually or in combination of two or more of them. Hydrophobic fibers can be short fibers or long fibers. Bicomponent fibers, such as core-shell fibers or fibers with parallel component placement, split fibers, modified cross-sectional fibers, shrink fibers, and the like can also be used as hydrophobic fibers.

[0052]

As hydrophilic fibers used in the absorbent sweat sheet of the present invention, fibers obtained by hydrophilizing hydrophobic fibers, in particular, for example, hydrophobic fibers with a mixed hydrophilizing agent, hydrophobic fibers having surfaces with an adhered hydrophilizing agent, and also plasma-treated hydrophobic can be used fiber. Fibers originally having hydrophilicity, for example, natural or semi-natural fibers, such as cellulose fibers, can also be used.

[0053]

An absorbent sweat sheet of the present invention can be produced, for example, by applying a hydrophilizing agent to a hydrophobic nonwoven material including hydrophobic fibers. In this case, the part to which the hydrophilizing agent adheres is the hydrophilic region. The method of applying a hydrophilizing agent to a hydrophobic nonwoven material is not limited to specific methods, and examples include applying or spraying a film-forming solution containing a hydrophilizing agent. The hydrophilizing agent may be any hydrophilizing agent commonly used for sanitary products.

[0054]

As the hydrophobic sheet of the present invention, a non-woven material comprising hydrophobic fibers (hot-melt fibers) is preferably used. As the non-woven material, the non-woven material used as the sweat-absorbing sheet of the present invention can be used.

[0055]

Examples of the sweat-absorbing sheet of the present invention include the following sweat-absorbing sheets A to C. Each of the sweat-absorbing sheets A to C is a laminate of a skin-friendly hydrophobic layer located as close as possible to the skin of the user and including hydrophobic fibers, and not facing the skin of a hydrophilic layer located on the surface of the hydrophobic layer facing the skin, which is not turned to the skin, and which includes hydrophilic fibers. As a hydrophobic layer facing the skin, for example, a hydrophobic non-woven material including hydrophobic fibers (a fully hydrophobic non-woven material) can be used, and as a hydrophilic layer not turned on the skin, for example, a hydrophilic non-woven material including hydrophilic fibers (a fully hydrophilic non-woven material).

[0056]

The main feature of the sweat-absorbing sheet A is that in the connected region (fused region) between the hydrophobic layer facing the skin and the hydrophilic layer not facing the skin, the constituent fibers in the layers are mixed.

The main feature of the sweat-absorbing sheet B is that the hydrophobic layer facing the skin has recesses recessed to the hydrophilic layer not facing the skin and has fused portions in these recesses near the hydrophilic layer not facing the skin.

The main feature of the sweat-absorbing sheet C is that the hydrophobic layer facing the skin has recesses deepened to the hydrophilic layer not facing the skin and has pores located in these recesses and penetrating through the hydrophobic layer facing the skin in the thickness direction.

[0057]

Sweat Absorbing Sheet A:

The sweat-absorbent sheet A includes: a hydrophobic layer facing the skin constituting a surface facing the skin; and a non-skin hydrophilic layer located on a non-skin surface of a skin-hydrophobic layer and a skin-hydrophobic layer and a non-skin hydrophilic layer are joined together by a plurality of connected regions that are provided by dispersion in the plane direction of the layers.

Around these connected regions, hydrophobic fibers included in the hydrophobic layer facing the skin enter the gaps between the hydrophilic fibers included in the hydrophilic layer untreated to the skin, while hydrophilic fibers included in the hydrophilic layer not turned to the skin enter the spaces between the hydrophobic fibers included in the hydrophobic layer facing the skin, and hydrophilic fibers included in the hydrophilic layer not turned to the skin, reach the skin-facing surface of the hydrophobic layer facing the skin wow layer.

[0058]

In sweat-absorbing sheet A, the term “fibers enter” means that in a cross section along the thickness direction of the sweat-absorbing sheet A, the constituent fibers of at least one of the hydrophobic layer facing the skin and the hydrophilic layer not facing the skin penetrate the other layer in the thickness direction and protrude from the surface of this other layer (from the surface opposite to that surface that faces this one layer).

The bonded regions are formed by hot stamping a laminate prepared by laying a hydrophobic layer facing the skin onto a hydrophilic layer not facing the skin, and in these connected regions, the constituent fibers of both layers melt and solidify.

[0059]

In the sweat-absorbing sheet A, the sweat of the wearer of the absorbent article easily moves, especially around the connected areas, to the non-skin-facing hydrophilic layer through hydrophilic fibers, which are included in the non-skin-hydrophilic layer but reach the skin-facing hydrophobic layer. Between the sweat of the user who has moved into the hydrophilic layer not turned to the skin and the skin of the user is located the hydrophobic layer facing the skin having hydrophobicity, and thus the sweat is difficult to return back to the skin. Therefore, the sweat-absorbing sheet can effectively prevent skin problems such as prickly heat.

[0060]

In the absorbent sweat sheet A, a hydrophobic non-woven material including hydrophobic fibers and a hydrophilic non-woven material including hydrophilic fibers are joined by a plurality of connected regions that are provided by dispersion. A nonwoven fabric produced by layering hydrophobic fibers and hydrophilic fibers and then melting and fixing both types of fibers with heat can also be used as the sweat-absorbing sheet of the present invention. This non-woven material is hereinafter referred to as “sweat-absorbing sheet A1”. The description for the sweat-absorbing sheet A will be appropriately applied to the features of the sweat-absorbing sheet A1, not specifically described.

[0061]

Sweat-absorbing sheet A1 includes: a hydrophobic layer facing the skin, placed as close as possible to the skin of the wearer, and including hydrophobic fibers; and a non-skin-hydrophilic layer located on a non-skin surface of the skin-facing hydrophobic layer and including hydrophilic fibers, and the skin-hydrophobic layer and the skin-non-skin hydrophilic layer are connected by a plurality of fused parts. Sweat-absorbent sheet A1 includes a single non-woven fabric. On its surface facing the skin there is a hydrophobic layer facing the skin including hydrophobic fibers, and on its surface not facing the skin is a hydrophilic layer not facing the skin including hydrophilic fibers. The sweat-absorbent sheet A1 has fused parts that fix the constituent fibers in the hydrophobic layer facing the skin and the constituent fibers in the hydrophilic layer not turned to the skin. These fused portions of the sweat-absorbing sheet A1 and the connected areas of the sweat-absorbing sheet A (the connected areas between the skin-facing hydrophobic sheet and the non-skin-hydrophilic sheet) are the same in joining and fixing the skin-facing hydrophobic layer including hydrophobic fibers ( facing the skin of a hydrophobic sheet), and a hydrophilic layer that is not turned to the skin, including hydrophilic fibers (hydrophilic sheet not turned to the skin), but differ in that the fused parts of the abs sweat-absorbing sheet A1, including a single non-woven fabric, is formed in the production of the non-woven fabric, and the bonded areas of the sweat-absorbing sheet including a stacked structure of two non-woven fabrics are formed after laying these non-woven fabrics. The fused portions of the sweat-absorbing sheet A1 are formed to fix the constituent fibers of the hydrophobic layer and the constituent fibers of the hydrophilic layer in order to maintain the sweat-absorbing sheet A1 as the only non-woven material. The fused portions of the sweat-absorbing sheet A1 can be distributed evenly or unevenly if the shape of the nonwoven material is substantially maintained.

[0062]

Sweat Absorbing Sheet B:

Sweat-absorbing sheet B includes: a hydrophobic layer facing the skin constituting a surface facing the skin; and a non-skin-hydrophilic layer located on a skin-non-skin surface of a hydrophobic layer facing the skin.

The hydrophobic layer facing the skin includes a plurality of depressions pressed in toward the hydrophilic layer not facing the skin, and the fused portions are located at the vertices of the respective depressions.

Each fused portion includes a portion in which the constituent fibers of the hydrophobic layer facing the skin melt and the constituent fibers are fused tightly together.

[0063]

In the absorbent sweat sheet B, the fused parts are formed by hot stamping only the hydrophobic layer facing the skin, and in the fused parts, the constituent fibers in the hydrophobic layer facing the skin melt and solidify.

In the “part in which the constituent fibers are densely fused together” in each fused part, the constituent fibers in the skin-facing sheet are fused together to form, for example, a film. Therefore, the “part in which the constituent fibers are densely fused together” is the liquid impermeable part through which the liquid does not pass.

[0064]

In the sweat-absorbing sheet B, “the part in which the constituent fibers are densely fused together” in the hydrophobic layer facing the skin, which is hydrophobic, is a liquid-impermeable part through which the liquid does not pass, but is a part having a relatively high affinity for water, and thus, the sweat of the wearer of the absorbent article is likely to be pulled from parts other than the recesses into the recesses, and the sweat will easily and quickly move from the periphery of the fused parts to the neobra ennomu to the skin hydrophilic layer has hydrophilic. Such a sweat of the user, having moved from a hydrophobic layer facing the skin to a hydrophilic layer not facing the skin, is difficult to return to the hydrophobic layer facing the skin or to the skin. Therefore, sweat-absorbing sheet B can effectively prevent skin problems such as prickly heat.

[0065]

Sweat Absorbing Sheet C:

Sweat-absorbent sheet C includes: a hydrophobic layer facing the skin, constituting a surface facing the skin; and a non-skin-hydrophilic layer located on a skin-non-skin surface of a hydrophobic layer facing the skin.

The hydrophobic layer facing the skin includes a plurality of depressions directed towards the hydrophilic layer not facing the skin, as well as pores located in the respective depressions and penetrating through the hydrophobic layer facing the skin in the thickness direction.

Each recess of the hydrophobic layer facing the skin has a smaller thickness, since the recess is located closer to the pore.

[0066]

The sweat-absorbent sheet C has an fused part in each recess in which the constituent fibers in the hydrophobic layer facing the skin are fused together, and a pore is formed in this fused part. Each fused portion includes a portion in which the constituent fibers of the hydrophobic layer facing the skin melt and the constituent fibers are fused tightly together. The “part in which the constituent fibers are densely fused together” is the same as that of the absorbent sweat sheet B. The fused parts are formed by hot stamping only the hydrophobic layer facing the skin. When hot stamping is performed under more severe conditions, in particular, for example, at a higher heating temperature or at a longer heating time, pores are formed in the formed fused parts.

[0067]

In the sweat-absorbing sheet C, the sweat of the wearer absorbent article of the user is likely to be pulled into the recesses from parts other than the recesses. In addition, each recess has a smaller thickness, since the recess is located closer to the pore, i.e. the distance between the constituent fibers in the hydrophobic layer facing the skin gradually decreases towards the pore, and thus the sweat easily and quickly moves through the pores to the hydrophilic non-skin hydrophilic layer. Such a sweat of the user, having moved from a hydrophobic layer facing the skin to a hydrophilic layer not facing the skin, is difficult to return to the hydrophobic layer facing the skin or to the skin. Therefore, sweat-absorbing sheet C can effectively prevent skin problems such as prickly heat.

[0068]

The present invention has been described based on embodiments, but the present invention may be suitably modified without limitation by these embodiments. For example, in embodiments, the hydrophobic sheet 11 is a separate sheet from the outer cover 3, but part of the outer cover 3, that is, the outer sheet 31 and / or the inner sheet 32, can be a hydrophobic sheet 11. In particular, for example, as is customary in the wearable disposable diaper, when the outer sheet 31, including the hydrophobic nonwoven material, is stretched in front of the front part F and / or the rear part R from the edge in the longitudinal direction X of the inner sheet 32 and folds to the skin facing surface of the inner sheet 32, which s to form a folded portion, the folded portion of this outer sheet 31 may be used as the hydrophobic sheet 11.

[0069]

In the diaper 1 in embodiments, the hydrophobic sheet 11 is provided along the entire lateral direction Y of the diaper 1, but the hydrophobic sheet 11 can be provided between the absorbent element 23 and the sweat-absorbing sheet 10 along the longitudinal edge 23a of the absorbent element 23, and is not necessarily provided throughout the lateral length of the absorbent article. In the diaper 1A shown in FIG. 6, a hydrophobic sheet 11 is provided in a section that is shorter than the full length in the lateral direction Y of the diaper 1A, and longer than the full length in the same direction of the absorbent element 23, and partially provided in the central part in the lateral direction Y diaper 1A.

[0070]

In embodiments, the outer cover 3 is divided into a front panel 3F and a rear panel 3R, and the absorbent assembly 2 connects and attaches to the panels 3F, 3R, but the outer coating of the present invention is not limited to such a continuous shape. For example, an outer cover may be used that is not divided into a front part and a back part, but having a continuous shape such as an hourglass shape including a front part, a crotch part and a back part. The absorbent article of the present invention is not limited to such a put on disposable diaper as the above-described diaper 1, but can be applied to conventional products used to absorb body fluids, for example, to an open type disposable diaper. In view of the above embodiments of the present invention, the following aspects are further disclosed.

[0071]

<1> An absorbent article having a longitudinal direction and a lateral direction orthogonal to the longitudinal direction coinciding with the direction from the front side through the crotch to the rear side of the user,

containing:

liquid retaining absorbent element;

an elastic sheet farther away from the skin of the user than the absorbent element, and having elasticity in the lateral direction; and

sweat-absorbing sheet having a hydrophilic region capable of absorbing sweat, and located in a section capable of contacting the skin of a wearer of a diaper, in which

the elastic sheet has an outer lateral elongated portion extending outward in a longitudinal direction from the longitudinal edge of the absorbent element,

a hydrophobic sheet is located on the elastic sheet so that the hydrophobic sheet is located further from the skin of the user than the sweat-absorbing sheet, and the hydrophobic sheet extends from the absorbent element to the outer lateral elongated portion of the elastic sheet along the longitudinal edge of the absorbent element,

the longitudinal inner edge of the sweat-absorbing sheet is located in the longitudinal direction outside of the longitudinal inner edge of the hydrophobic sheet,

the hydrophobic sheet partially overlaps with the sweat-absorbing sheet in a plan view and has an inner lateral elongate portion extending inwardly in a longitudinal direction from a longitudinal inner edge of the sweat-absorbing sheet, and

the absorbent article includes: a region A that is located in the longitudinal direction in the same position as the sweat-absorbing sheet; as well as region B, which is located in the longitudinal direction in the same position as the inner lateral elongated part of the hydrophobic sheet, and region B has a greater tensile force in the lateral direction than region A.

[0072]

<2> An absorbent article according to <1>, wherein the sweat-absorbing sheet has an outer lateral elongate portion extending outward in a longitudinal direction from a longitudinal outer edge of the hydrophobic sheet.

<3> An absorbent article according to <2>, wherein the outer lateral elongated portion of the sweat-absorbing sheet has a length in the longitudinal direction of preferably 3 mm or more, more preferably 5 mm or more, and preferably 50 mm or less, more preferably 40 mm or less.

<4> An absorbent article according to <2> or <3>, wherein the sweat-absorbing sheet is joined in the outer lateral elongated portion of the sweat-absorbing sheet to the elastic sheet, and is joined in a portion close to the outer lateral elongated portion of the sweat-absorbing sheet, with a hydrophobic sheet.

[0073]

<5> An absorbent article according to any one of <2> to <4>, wherein region A has: region A1, which is located in the same position as the outer lateral elongated portion of the sweat-absorbing sheet in the longitudinal direction; and region A2, which is a region different from region A1, and

region B has a greater lateral tensile force than region A1.

<6> An absorbent article according to any one of <2> to <5>, wherein regions in decreasing order of tensile force in the lateral direction are as follows: region B, region A2, and region A1.

<7> An absorbent article according to <5> or <6>, wherein the ratio of the lateral tensile force of region B to the lateral tensile force of region A1 is preferably 1.06 or more, more preferably 1.08 or more and preferably 2.2 or less, more preferably 2 or less.

<8> An absorbent article according to any one of <5> to <7>, wherein the lateral tensile force of the region A1 is less than the tensile force of the region B, and is preferably 0.005 N / mm or more, more preferably 0, 0075 N / mm or more, and preferably 0.05 N / mm or less, more preferably 0.04 N / mm or less.

<9> An absorbent article according to any one of <5> to <8>, wherein the ratio of the lateral tensile force of region B to the lateral tensile stress of region A2 is preferably 1.02 or more, more preferably 1.04 or more, and preferably 1.8 or less, more preferably 1.6 or less.

<10> An absorbent article according to any one of <5> to <9>, wherein the ratio of the lateral tensile force of the region A2 to the lateral tensile force of the region A1 is preferably 1.04 or more, more preferably 1.06 or more, and preferably 2 or less, more preferably 1.8 or less.

[0074]

<11> An absorbent article according to any one of <1> to <10>, wherein the absorbent member overlaps with the lateral central portion of the elastic sheet and the lateral central portion of the elastic sheet has lower elasticity than both side portions of the elastic sheet.

<12> An absorbent article according to any one of <1> to <11>, wherein the sweat absorbent sheet includes hydrophilic fibers and hydrophobic fibers.

<13> An absorbent article according to any one of <1> to <12>, wherein the sweat-absorbing sheet includes: a hydrophobic layer facing the skin located as close as possible to the user's skin and including hydrophobic fibers; and a non-skin-hydrophilic layer located on a non-skin surface of the skin-facing hydrophobic layer and including hydrophilic fibers, and a skin-facing hydrophobic layer and a skin-non-skin hydrophilic layer are connected by a plurality of fused parts.

<14> An absorbent article according to any one of <1> to <12>, wherein

sweat-absorbing sheet includes: a hydrophobic layer facing the skin constituting the surface of the sweat-absorbing sheet facing the skin; and a non-skin-hydrophilic layer located on a non-skin surface of a skin-hydrophobic layer and a skin-hydrophobic layer and a skin-non-skin hydrophilic layer are joined together by a plurality of connected regions that are provided by dispersion in the plane direction of the layers, and

around these connected regions, hydrophobic fibers included in the hydrophobic layer facing the skin enter the gaps between the hydrophilic fibers included in the hydrophilic layer untreated to the skin, hydrophilic fibers included in the hydrophilic layer not turned to the skin enter the gaps between the hydrophobic fibers included in a hydrophobic layer facing the skin, and hydrophilic fibers included in the hydrophilic layer unrefined to the skin reach the skin-facing surface of the hydrophobic layer facing the skin.

<15> An absorbent article according to any one of <1> to <14>, wherein

the sweat-absorbing sheet includes a hydrophobic layer facing the skin located as close as possible to the skin of the wearer and including hydrophobic fibers,

a recess is formed on the skin-facing surface of the hydrophobic layer facing the skin, the fused portion is located at the top of the recess, and this fused portion includes a part in which the constituent fibers of the hydrophobic layer facing the skin are fused together.

<16> An absorbent article according to any one of <1> to <14>, wherein

the sweat-absorbing sheet includes a hydrophobic layer facing the skin located as close as possible to the skin of the wearer and including hydrophobic fibers,

a recess is formed on the skin-facing surface of the hydrophobic layer facing the skin, and a pore penetrating the hydrophobic layer facing the skin in the thickness direction is formed in this recess.

[0075]

<17> An absorbent article according to any one of <1> to <16>, wherein the sweat-absorbing sheet has a length in the longitudinal direction of preferably 20 mm or more, more preferably 30 mm or more, and preferably 100 mm or less, more preferably 80 mm or less.

<18> An absorbent article according to any one of <1> to <17>, wherein the hydrophobic sheet has a length in the longitudinal direction of preferably 20 mm or more, more preferably 30 mm or more, and preferably 100 mm or less, more preferably 80 mm or less.

<19> An absorbent article according to any one of <1> to <18>, wherein the sweat-absorbent sheet is provided in a side center portion of the absorbent article, and the lateral length (length in the length direction) of the sweat-absorbent sheet is preferably 40% or more, more preferably 70% or more, and at most 100% of the total lateral length of the absorbent article.

<20> An absorbent article according to any one of <1> to <19>, wherein a hydrophobic sheet is provided along a longitudinal edge of the absorbent element between the absorbent element and the sweat-absorbing sheet, and a lateral length (length in the length direction) of the hydrophobic sheet preferably 110% or more, more preferably 120% or more, and preferably 300% or less, more preferably 250% or less of the full length in the lateral direction of the absorbent element.

<21> An absorbent article according to any one of <1> to <20>, wherein the inner lateral elongated portion of the hydrophobic sheet has a length in the longitudinal direction (length of the region B in the longitudinal direction), preferably 3 mm or more, more preferably 5 mm or more, and preferably 25 mm or less, more preferably 15 mm or less.

[0076]

<22> An absorbent article according to any one of <1> to <21>, wherein the sweat absorbent sheet has a bulk of preferably 5 g / m ² or more, more preferably 8 g / m ² or more, and preferably 50 g / m ² or less, more preferably 40 g / m ² or less.

<23> An absorbent article according to any one of <1> to <22>, wherein the sweat-absorbing sheet has a thickness of preferably 0.05 mm or more, more preferably 0.1 mm or more, and preferably 1 mm or less, more preferably 0.8 mm or less.

<24> An absorbent article according to any one of <1> to <23>, wherein the hydrophobic sheet has a bulk of preferably 5 g / m ² or more, more preferably 8 g / m ² or more, and preferably 30 g / m ² or less, more preferably 20 g / m ² or less.

<25> An absorbent article according to any one of <1> to <24>, wherein the hydrophobic sheet has a thickness of preferably 0.05 mm or more, more preferably 0.1 mm or more, and preferably 0.8 mm or less more preferably 0.6 mm or less.

[0077]

<26> An absorbent article according to any one of <1> to <25>, wherein the ratio of the lateral tensile force of region B to the lateral tensile stress of region A is preferably 1.04 or more, more preferably 1.06 or more, and preferably 2 or less, more preferably 1.8 or less.

<27> An absorbent article according to any one of <1> to <26>, wherein the lateral tensile force of region A is less than the tensile force of region B, and preferably is 0.006 N / mm or more, more preferably 0.008 N / mm or more, and preferably 0.055 N / mm or less, more preferably 0.045 N / mm or less.

<28> An absorbent article according to any one of <1> to <27>, wherein the lateral tensile force of region B is greater than the tensile stress of region A, and is preferably 0.008 N / mm or more, more preferably 0, 01 N / mm or more, and preferably 0.07 N / mm or less, more preferably 0.06 N / mm or less.

[0078]

<29> An absorbent article according to any one of <1> to <28>, wherein the sweat-absorbing sheet is a nonwoven material.

<30> An absorbent article according to any one of <1> to <29>, wherein in the sweat-absorbing sheet, the hydrophilic region includes hydrophilic fibers and a region other than the hydrophilic region includes hydrophobic fibers.

<31> An absorbent article according to any one of <1> to <30>, wherein the elastic sheet (outer sheet) includes an elastic element fixed laterally in an extended state.

[0079]

<32> An absorbent article according to any one of <1> to <31>, wherein

the absorbent article includes: a part of the crotch that will be placed on the crotch of the user; a front portion extending longitudinally from the front side of the crotch portion; and a back extending in a longitudinal direction from the back of the perineum, and

sweat-absorbing sheet is provided at least at the rear.

<33> An absorbent article according to <32>, wherein the sweat-absorbing sheet is provided on a skin-facing surface in each of the front and back, outwardly in a longitudinal direction from an imaginary straight line that divides the front or back into longitudinal direction in two parts.

<34> An absorbent article according to <32> or <33>, wherein the sweat-absorbing sheet has an oblong shape in one direction in a plan view (rectangular shape), and is provided along the entire length in the lateral direction of each of the front and back parts in such a way that the length direction of the sweat-absorbing sheet coincides with the lateral direction.

<35> An absorbent article according to any one of <32> to <34>, wherein the hydrophobic sheet has a flat shape identical to that of a sweat-absorbing sheet, elongated in one direction in a plan view (rectangular shape), and provided along the entire length in the lateral direction of each of the front part and the rear part so that the length direction of the hydrophobic sheet coincides with the lateral direction.

INDUSTRIAL APPLICABILITY

[0080]

The present invention provides an absorbent article comprising a sweat-absorbing sheet that gently comes into contact with the skin and quickly absorbs sweat, as well as an absorbent element that absorbs body fluid but practically does not pass it out through the sweat-absorbing sheet.

Claims (27)

1. An absorbent article having a longitudinal direction and a lateral direction orthogonal to a longitudinal direction coinciding with a direction extending from the front side through the crotch to the rear side of the user, containing: liquid retaining absorbent element; an elastic sheet farther away from the skin of the user than the absorbent element, and having elasticity in the lateral direction; and sweat-absorbing sheet having a hydrophilic region capable of absorbing sweat, and located in a section capable of contacting the skin of a wearer of a diaper, in which the elastic sheet has an outer lateral elongated portion extending outward in a longitudinal direction from the longitudinal edge of the absorbent element, a hydrophobic sheet is located on the elastic sheet so that the hydrophobic sheet is located on a side farther from the wearer's skin than the sweat-absorbing sheet, and the hydrophobic sheet extends from the absorbent member to the outer lateral elongated portion of the elastic sheet along the longitudinal edge of the absorbent member, the longitudinal inner edge of the sweat-absorbing sheet is located in the longitudinal direction outside of the longitudinal inner edge of the hydrophobic sheet, the hydrophobic sheet partially overlaps with the sweat-absorbing sheet in a plan view and has an inner lateral elongate portion extending inwardly in a longitudinal direction from a longitudinal inner edge of the sweat-absorbing sheet, and the absorbent article includes: a region A that is located in the longitudinal direction in the same position as the sweat-absorbing sheet; and region B, which is located in the longitudinal direction in the same position as the inner lateral elongated portion of the hydrophobic sheet, and region B has a greater tensile force in the lateral direction than region A. 2. The absorbent article of claim 1, wherein the sweat-absorbing sheet has an outer lateral elongate portion extending outwardly in a longitudinal direction from a longitudinal outer edge of the hydrophobic sheet. 3. The absorbent article of claim 2, wherein the sweat-absorbing sheet is joined in the outer lateral elongated portion of the sweat-absorbing sheet to the elastic sheet and connected in a portion close to the outer lateral elongated portion of the sweat-absorbing sheet to a hydrophobic sheet. 4. The absorbent article of claim 2, wherein region A has: region A1, which is located in the same position as the outer lateral elongated portion of the sweat-absorbing sheet in the longitudinal direction; and region A2, which is a region different from region A1, and region B has a greater lateral tensile force than region A1. 5. Absorbent product according to claim 4, in which the areas in decreasing order of the tensile force in the lateral direction are as follows: region B, region A2 and region A1. 6. The absorbent article of claim 1, wherein the absorbent member overlaps with the lateral central portion of the elastic sheet and the lateral central portion of the elastic sheet has lower elasticity than both side portions of the elastic sheet. 7. The absorbent article of claim 1, wherein the sweat absorbent sheet includes hydrophilic fibers and hydrophobic fibers. 8. The absorbent article of claim 1, wherein the sweat-absorbing sheet includes: a hydrophobic layer facing the skin located as close to the skin of the user as possible and comprising hydrophobic fibers; and a non-skin-hydrophilic layer located on a non-skin surface of the skin-facing hydrophobic layer and including hydrophilic fibers, and a skin-facing hydrophobic layer and a skin-non-skin hydrophilic layer are connected by a plurality of fused parts. 9. Absorbent product according to claim 1, in which sweat-absorbing sheet includes: a hydrophobic layer facing the skin constituting the surface of the sweat-absorbing sheet facing the skin; and a non-skin-hydrophilic layer located on a non-skin surface of a skin-hydrophobic layer and a skin-hydrophobic layer and a skin-non-skin hydrophilic layer are joined together by a plurality of connected regions that are provided by dispersion in the plane direction of the layers, and around these connected regions, hydrophobic fibers included in the hydrophobic layer facing the skin enter the gaps between the hydrophilic fibers included in the hydrophilic layer untreated to the skin, hydrophilic fibers included in the hydrophilic layer not turned to the skin enter the gaps between the hydrophobic fibers included in a hydrophobic layer facing the skin, and hydrophilic fibers included in the hydrophilic layer unrefined to the skin reach the skin-facing surface of the hydrophobic layer facing the skin. 10. Absorbent product according to claim 1, in which the sweat-absorbing sheet includes a hydrophobic layer facing the skin located as close as possible to the skin of the wearer and including hydrophobic fibers, a recess is formed on the skin-facing surface of the hydrophobic layer facing the skin, and a pore penetrating through the hydrophobic layer facing the skin in the thickness direction is formed in this recess. 11. Absorbent product according to claim 1, in which the absorbent article includes: a part of the crotch that will be placed on the crotch of the user; a front portion extending longitudinally from the front side of the crotch portion; and a back extending in a longitudinal direction from the back of the perineum, and sweat-absorbing sheet is provided at least at the rear.

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