CN113891699A

CN113891699A - Absorbent article

Info

Publication number: CN113891699A
Application number: CN202080039414.9A
Authority: CN
Inventors: 富田美奈; 幸田拓也; 白川贵史
Original assignee: Kao Corp
Current assignee: Kao Corp
Priority date: 2019-05-30
Filing date: 2020-05-25
Publication date: 2022-01-04
Anticipated expiration: 2040-05-25
Also published as: WO2020241553A1; JP7252831B2; DE112020002768T5; GB2597193B; TW202100119A; JP2020195424A; CN113891699B; GB202116207D0; GB2597193A

Abstract

The absorbent article comprises an absorbent main body (1A) including a liquid-permeable topsheet (2), an absorbent body (4), and a leakage-preventive sheet (3), has a longitudinal direction (X) corresponding to the front-back direction of the wearer and a width direction (Y) orthogonal thereto, and includes a ventral region (F), a crotch region (M), and a back region (R) along the longitudinal direction (X), and the absorbent body (4) is disposed from the ventral region (F) to the back region (R). An exterior sheet (5) is disposed on the non-skin-facing surface side of the absorbent body (1A). The exterior sheet (5) is formed with a longitudinal ridge-groove shape (5A), and the longitudinal ridge-groove shape (5A) alternately has a longitudinal ridge portion (51) and a longitudinal groove portion (52) extending in the longitudinal direction (X). The longitudinal ridge-groove shape (5A) is formed in a region overlapping the absorbent body (4) in the thickness direction (Z) in the crotch region (M).

Description

Absorbent article

Technical Field

The present invention relates to an absorbent article.

Background

An absorbent article such as a disposable diaper typically includes: an absorbent body containing an absorbent material such as hydrophilic fibers or water-absorbent polymers; a front sheet disposed closer to the skin of the wearer than the absorber; and a leakproof sheet which is arranged on the side closer to the skin of the wearer than the absorber and is composed of a resin film and the like; if necessary, an exterior sheet may be disposed outside the leakproof sheet. Various improvements have been made to such absorbent articles in order to improve the appearance and wearability.

Patent document 1 describes: in order to improve visibility of a pattern disposed outside a diaper, a pattern is printed on an outer surface of a target tape made of a nonwoven fabric, and a bonding line formed by bonding constituent fibers of the nonwoven fabric is formed in a corrugated shape extending in a width direction of the diaper.

Patent document 2 discloses a diaper in which an extensible film is disposed between a topsheet and a backsheet on the back side of an absorbent body in order to improve the wearability of the back side of a wearer when changing the diaper. This document also describes: the stretch film is formed on a backsheet so that a plurality of gathers extending in the longitudinal direction of the product reach the back-side edge in the natural state of the diaper, with at least 1 stretch layer sandwiched between 2 non-stretch layers.

Documents of the prior art

Patent document

Patent document 1: japanese Kohyo publication No. 2012-526642

Patent document 2: japanese laid-open patent publication No. 2015-202251

Disclosure of Invention

The present invention relates to an absorbent article including an absorbent main body including a liquid-permeable topsheet, an absorbent body, and a leakage-preventive sheet, the absorbent body having a longitudinal direction corresponding to a front-back direction of a wearer and a width direction orthogonal to the longitudinal direction, and including a front side region, a crotch region, and a back side region along the longitudinal direction, the absorbent body being disposed from the front side region to the back side region.

An exterior sheet is disposed on the non-skin-facing surface side of the absorbent body.

The exterior sheet is formed with a longitudinal ridge groove shape having a longitudinal ridge portion and a longitudinal groove portion extending in the longitudinal direction alternately.

The longitudinal groove is formed in a region overlapping the absorbent body in the thickness direction in the crotch region.

Drawings

Fig. 1 is an expanded plan view schematically showing a skin-facing surface side (inner surface side) in an expanded and stretched state of an embodiment of the absorbent article of the present invention.

Fig. 2 is a sectional view taken along line I-I of the absorbent article shown in fig. 1.

Fig. 3 is an expanded plan view schematically showing the non-skin-facing surface side (outer surface side) of the absorbent article shown in fig. 1 in an expanded and stretched state.

Fig. 4 is a sectional view of the absorbent article shown in fig. 1 at line II-II.

Fig. 5 is a developed plan view schematically showing a non-skin-facing surface side (outer surface side) in a developed and stretched state of another embodiment of the absorbent article of the present invention.

Fig. 6 is a developed plan view schematically showing a non-skin-facing surface side (outer surface side) in a developed and stretched state of yet another embodiment of the absorbent article of the present invention.

Fig. 7 is a developed plan view schematically showing a non-skin-facing surface side (outer surface side) in a developed and stretched state of yet another embodiment of the absorbent article of the present invention.

Fig. 8 is a developed plan view schematically showing a non-skin-facing surface side (outer surface side) in a developed and stretched state of yet another embodiment of the absorbent article of the present invention.

Fig. 9 is a developed plan view schematically showing a non-skin-facing surface side (outer surface side) in a developed and stretched state of yet another embodiment of the absorbent article of the present invention.

Fig. 10 is a perspective view schematically showing a state in which the absorbent article shown in fig. 9 is worn.

Fig. 11 (a) is an enlarged view of a main portion of the cross section of the absorbent article shown in fig. 2, and fig. 11 (b) is an enlarged view of a main portion of the non-skin-facing surface side of the absorbent article shown in fig. 5.

Detailed Description

However, in absorbent articles such as diapers, the humidity inside the diaper may increase due to sweat of a wearer or water vapor generated by absorption of retained excretory fluid in a worn state. Since the increase in humidity may cause uncomfortable wearing feeling or cause skin rash, a leakproof sheet is generally formed of a resin film which is hardly permeable to liquid and has moisture permeability in order to prevent such a situation. In this case, depending on the surrounding environment, the water vapor released to the outside through the leakproof sheet may condense on the non-skin-facing surface of the diaper or the like.

Although the moisture generated by condensation does not seep out of the absorbent article, various uncomfortable feelings may occur such as: the wet diaper can be used for making clothes positioned at the abdomen or the leg surrounding part wet, inducing the leakage of urine of a wearer by sensing the moisture of the clothes, or increasing the uneasiness for the leakage of urine. In addition, the moisture generated by condensation may cause a user to misunderstand that leakage from the absorbent article has occurred. The techniques described in the above patent documents have not been studied at all for the suppression of such condensation.

The present invention relates to an absorbent article that suppresses a feeling of discomfort or misrecognition of leakage due to water vapor released to the outside of the absorbent article, and improves comfort when worn.

Hereinafter, the absorbent article of the present invention will be described based on preferred embodiments thereof. Fig. 1 to 4 show an open-type disposable diaper (hereinafter, also simply referred to as "diaper") as a preferred embodiment of the absorbent article of the present invention. Fig. 1 shows the structure of the diaper 1 as viewed from the skin-facing surface side. The diaper 1 shown in the figure has a longitudinal direction X corresponding to the front-back direction of the wearer and extending from the abdomen side to the back side of the wearer through the crotch portion, and a width direction Y perpendicular thereto, in its unfolded and extended state. The diaper 1 has a stomach-side region F disposed on the stomach side of the wearer when worn, a back-side region R disposed on the back side, and a crotch region M located between the stomach-side region F and the back-side region R. Each region is a region obtained by trisecting the entire length of the diaper 1 in the longitudinal direction X, and extends continuously in the front-rear direction of the wearer. The crotch region M has a excretory part facing portion (not shown) disposed to face the excretory part of the wearer when the diaper 1 is worn.

As shown in fig. 1 and 2, the diaper 1 includes a liquid-permeable topsheet 2 forming a skin-facing surface and a liquid-impermeable barrier sheet 3 forming a non-skin-facing surface and having low liquid permeability (including water repellency). An absorbent body 4 is disposed between the topsheet 2 and the leakproof sheet 3, and these members constitute an absorbent main body 1A. The topsheet 2 and the leakproof sheet 3 each have a size larger than that of the absorbent member 4 and extend outward from the outer periphery of the absorbent member 4. As shown in fig. 1, the topsheet 2 and the leakproof sheet 3 extend outward in the width direction Y from both side edges of the absorbent member 4 in the longitudinal direction X. Both longitudinal end edges of the topsheet 2 and the leakproof sheet 3 in the present embodiment substantially coincide with both longitudinal end edges of the diaper 1.

As shown in fig. 1 and 2, the diaper 1 includes an absorbent body 4 having liquid retainability. The absorbent member 4 shown in the figure is substantially rectangular and is disposed so that the longitudinal direction thereof coincides with the longitudinal direction X of the diaper. The absorber 4 is disposed from the ventral region F to the dorsal region R. As shown in fig. 2, the absorbent body 4 is formed by covering an absorbent core 41 having absorbent performance with a liquid-permeable core-covering sheet 42. The absorbent body 4 in the present embodiment has a portion narrowed in the width direction Y in the crotch region M. Both longitudinal end edges of the absorbent member 4 are positioned inward of both longitudinal end edges of the diaper 1.

In the present specification, the "developed and extended state" of the diaper 1 refers to a state in which the diaper 1 is in a developed state, and elastic members of the respective portions of the diaper 1 in the developed state are extended to be extended to a designed size (the same size as a size when the diaper is expanded in a flat shape in a state in which the influence of the elastic members is completely eliminated). When attention is paid to a diaper or a component thereof (e.g., an absorber), the "skin-facing surface" is a surface facing the skin of a wearer when the diaper is worn, and the "non-skin-facing surface" is a surface facing the opposite side of the skin of the wearer when the diaper is worn. That is, the skin-facing surface is a surface on the side relatively close to the skin of the wearer, and the non-skin-facing surface is a surface on the side relatively far from the skin of the wearer. "worn" and "worn state" refer to a state in which a diaper is worn while being maintained in a proper wearing position.

Fig. 3 shows the structure of the diaper 1 as viewed from the non-skin-facing surface side. Although the leak-proof cuffs 6 and the

elastic members

62 and 85, which will be described later, are not shown in the figure, they are shown only for convenience of description and are actually the same as the diaper 1 shown in fig. 1.

As shown in fig. 2 and 3, the exterior sheet 5 is disposed on the non-skin-facing surface side of the absorbent main body 1A. The outer sheet 5 is a member forming the outer surface of the diaper 1 which can be visually recognized from the outside in a worn state of the diaper 1. The exterior sheet 5 shown in the figure is disposed on the non-skin-facing surface of the absorbent body 1A from the abdomen-side region F to the back-side region R in the longitudinal direction X. The outer sheet 5 forms the outer shape of the diaper 1 in an unfolded and stretched state, and the peripheral edge of the outer sheet 5 forms the contour lines of each of the abdomen-side region F, the crotch region M, and the back-side region R.

As shown in fig. 2 and 3, the exterior sheet 5 is formed with a ridge-groove shape 5A, and the ridge-groove shape 5A alternately has a plurality of ridges 51 protruding toward the non-skin-facing surface side and extending in one direction, and a groove 52 located between the ridges 51. The exterior sheet 5 is joined to the leakproof sheet 3 via an adhesive 53 at a position where the groove portion 52 is formed. In the embodiment shown in the figure, the adhesive 53 forms a bonding region extending in the longitudinal direction X and arranged at an interval in the width direction Y. That is, the exterior sheet 5 and the leakproof sheet 3 are bonded to each other at intervals in the width direction Y in a plurality of bonding regions extending in the longitudinal direction X. The ridge portion 51 shown in the figure is formed to protrude with a space from the leakproof sheet 3, and the region of the ridge portion 51 defined by the exterior sheet 5 and the leakproof sheet 3 is hollow. On the other hand, the leakage preventing sheet 3 is substantially flat. The ridge-groove shape 5A having the ridge portion 51 and the groove portion 52 is formed at least in a region overlapping with the absorbent body 4 in the thickness direction Z in the crotch region M.

The exterior sheet 5 may be formed of a single layer as shown in fig. 2, or a sheet obtained by stacking a plurality of sheets may be used instead. More specifically, the exterior sheet 5 may be formed of 2 nonwoven fabrics joined to a plurality of locations at intervals in the width direction Y of the diaper 1, and the ridge portion 51 may be formed in a portion where one nonwoven fabric of the 2 nonwoven fabrics is not joined to the other nonwoven fabric, so as to protrude in a direction away from the other nonwoven fabric. In this case, the ridge portion 51 is preferably hollow in a region defined by one nonwoven fabric and the other nonwoven fabric. The 2 nonwoven fabrics may each independently have a single-layer structure or a laminate structure of 2 or more layers. The ridge portion 51 may have a low-density portion having a fiber density smaller than that of the surface portion of the ridge portion inside the ridge portion instead of forming a hollow portion between the exterior sheet 5 and the leakproof sheet 3 or between 2 nonwoven fabrics constituting the exterior sheet 5.

In the embodiment shown in fig. 1 to 3, a plurality of ridge portions 51 and groove portions 52 formed in the exterior sheet 5 are linearly formed so as to extend in the longitudinal direction X, and are alternately arranged in the width direction Y. The ridge portions 51 and the groove portions 52 are formed parallel to each other. The ridge-groove shape 5A having the ridge portion 51 and the groove portion 52 is formed from the abdomen-side region F to the back-side region R so as to include a region overlapping with the absorbent body 4 in the thickness direction Z in the crotch region M, and is formed so as to reach both longitudinal end edges of the diaper 1. The ridge groove shapes 5A are formed not only in the region overlapping the absorbent body 4 in the thickness direction Z but also outside in the width direction Y of both side edges of the absorbent body 4 along the longitudinal direction X. In the following description, the ridge portion 51 extending in the longitudinal direction X of the diaper 1 is also referred to as a "longitudinal ridge portion 51", the groove portion 52 extending in the longitudinal direction X of the diaper 1 is also referred to as a "longitudinal groove portion 52", and the ridge groove shape 5A formed so as to extend in the longitudinal direction X of the diaper 1 is also referred to as a "longitudinal ridge groove shape 5A". Preferably, neither the longitudinal ridge portions 51 nor the longitudinal groove portions 52 is formed by a compacting treatment such as embossing. The method of forming the longitudinal ridge portions 51 and the longitudinal groove portions 52 in the exterior sheet 5 will be described below.

As shown in fig. 1 and 2, a pair of

leakage preventing cuffs

6, 6 may be provided on both side portions of the skin-facing surface of the diaper 1 in the longitudinal direction X. The leak-proof cuff 6 is composed of a water repellent and air permeable leak-proof cuff forming sheet 61. One or more linear elastic members 62 for forming the leakage preventing cuffs are disposed in an extended state in the longitudinal direction X in the vicinity of the free end of each leakage preventing cuff 6. The leakage preventive cuff 6 is contracted by the elastic member 62 disposed in an extended state when the diaper 1 is worn, and rises at least in the crotch region M, thereby preventing the outflow of excrement such as urine to the outside in the width direction Y.

As shown in fig. 1 to 4, the outer sheet 5 extends outward in the width direction Y from both side edges of the absorbent main body 1A in the longitudinal direction X, and forms a flap portion S together with the leakage preventing cuff forming sheet 61 constituting the leakage preventing cuff 6. The flank portion S has a pair of ventral flank portions Sf, Sf formed in the ventral region F, and a pair of dorsal flank portions Sr, Sr formed in the dorsal region R. The absorbent main body 1A has the width of the minimum width portion of the crotch region M and extends over the entire area in the longitudinal direction X of the diaper 1, and the abdominal side wing portions Sf and the back side wing portions Sr are portions of the abdominal side region F and the back side region R that are located on the outer sides in the width direction Y than both side edges of the absorbent main body 1A in the longitudinal direction X. Fig. 1 shows a one-dot chain line of the diaper 1 along the boundary between the absorbent body 1A and the abdominal side flap Sf or the back side flap Sr. The wing S is not limited to being formed by the outer sheet 5 and the leak-proof cuff forming sheet 61. For example, the absorbent article may further include members such as the topsheet 2 and the leakproof sheet 3 that extend outward in the width direction Y from both side edges of the absorbent body 4. The members constituting the flap section S are preferably joined to each other by a known joining method such as adhesive, heat sealing, ultrasonic sealing, or the like at extending portions extending from the both side edges of the absorbent body 4.

As shown in fig. 1 and 3, the diaper 1 of the present embodiment is provided with a pair of

fastening tapes

7, 7 on a pair of back-side wing portions Sr, Sr formed in the back-side region R. Each of the hook and loop fasteners 7 is disposed so as to extend from both side edges of each of the back-side flap portions in the width direction Y. As shown in fig. 4, one end of each of the fastening tapes 7 is fixed between the exterior sheet 5 and the leakage-preventing-cuff forming sheet 61.

As shown in fig. 1 and 4, air-permeable portions 1T are preferably formed in the wing portions S on the ventral and dorsal sides, and the air-permeable portions 1T are portions of the wing portions S having fewer components than portions other than the wing portions S. In the present embodiment, the air-permeable portion 1T in the back-side wing portion Sr is a portion located on the outer side in the width direction Y of the absorbent main body 1A and on the inner side in the width direction Y of the hook and loop fastener 7, and the air-permeable portion 1T in the abdominal-side wing portion Sf is formed substantially over the entire region of the abdominal-side wing portion Sf. As shown in fig. 4, the ventilation portion 1T in the present embodiment is a portion of the flap portion S that is formed by the outer covering sheet 5 and the leak-proof cuff forming sheet 61, and these sheets are not joined to each other by an adhesive or the like.

A fixing region 7A is provided on the non-skin-facing surface in the abdominal region F of the diaper 1, and the fixing portion 71 of the hook and loop fastener 7 can be detachably fixed to the fixing region 7A. The fixing region 7A may be made of an appropriate material selected according to the material of the fixing portion 71 of the surface fastener 7. For example, when the fixing portion 71 is a male member of a mechanical hook and loop fastener, a fiber sheet, for example, a woven fabric or a nonwoven fabric, which can be engaged with the male member, may be used as the female member of the mechanical hook and loop fastener as the fixing region 7A. When the fixing portion 71 is an adhesive, a smooth film made of, for example, a synthetic resin may be used as the fixing region 7A. In the embodiment shown in fig. 3, the exterior sheet 5 forming the non-skin-facing surface in the abdomen-side region F of the diaper 1 is a fastening region 7A.

As shown in fig. 1, a plurality of leg elastic members 85 for forming leg gathers are disposed in an extended state along the longitudinal direction X on both side portions of the diaper 1 along the longitudinal direction X, and the leg gathers can be formed by contraction of the leg elastic members 85. In the present embodiment, no elastic member is present in each longitudinal end region in the abdomen-side region F and the back-side region R of the diaper 1, but as long as the effects of the present invention can be achieved, for example, an elastic member may be further disposed in an extended state in the width direction Y, and a waist gather may be formed by contraction of the elastic member.

The topsheet 2, the leakproof sheet 3 and the absorbent member 4 may be made of materials conventionally used in absorbent articles, without any particular limitation. As the topsheet 2, for example, a liquid-permeable nonwoven fabric, an apertured film, or the like can be used. As the leakproof sheet 3, a resin film having poor liquid permeability, a laminate of a resin film and a nonwoven fabric, or the like can be used. In the absorbent core 41 of the absorbent body 4, an aggregate of hydrophilic fibers such as wood pulp and hydrophilized synthetic fibers, or a core in which a water-absorbent polymer is held in the aggregate can be used. As the core sheet 42, the same sheet as the front sheet 2 may be used. Further, as the leak-proof cuff-forming sheet 61, a water repellent nonwoven fabric may be used.

Further, as the exterior sheet 5, it is preferable to use a non-stretchable sheet having no stretchability. For example, nonwoven fabrics obtained by various production methods can be used as the exterior sheet 5, and for example, spun bond nonwoven fabrics, hot air nonwoven fabrics, spunlace nonwoven fabrics, hot rolled nonwoven fabrics, melt blown nonwoven fabrics, or laminated nonwoven fabrics thereof can be used. The exterior sheet 5 may be formed of one sheet as shown in fig. 2, or may be formed of a laminate of a plurality of sheets instead.

Among them, from the viewpoint of improving the breathability of the diaper to improve the comfort of the wearer and from the viewpoint of improving the efficiency of forming the ridge groove shape 5A, it is preferable to use a hot air nonwoven fabric as the exterior sheet 5, and it is also preferable to use a single layer nonwoven fabric.

The ridge-groove shape 5A having the above-described form can be formed, for example, by applying a plurality of adhesive strips in a band shape on one surface of one sheet to which tension is applied, laminating another sheet to which tension higher than that of the one sheet is applied on the adhesive-applied surface of the one sheet to prepare a bonded sheet, and then setting the tension applied to the bonded sheet lower than that of the other sheet.

To explain the leakproof sheet 3 and the outer sheet 5 constituting the diaper 1 in detail by way of example, first, a plurality of strips of adhesive are applied to one surface of a long strip-shaped leakproof sheet 3 in a strip shape so as to extend in the conveying direction of the leakproof sheet 3, preferably so as to extend in the direction along the conveying direction of the leakproof sheet 3. That is, the leakproof sheet 3 is formed with the coated portions (joint regions) to which the adhesive is attached and the non-coated portions to which no adhesive is attached alternately in a direction intersecting the conveying direction of the leakproof sheet 3, preferably in a direction orthogonal to the conveying direction of the leakproof sheet 3.

Then, the leakproof sheet 3 coated with the adhesive is bonded to the long belt-shaped exterior sheet 5 in a state where tension is applied in the same direction as the conveying direction of the leakproof sheet 3. At this time, the tension applied to the exterior sheet 5 is set in the same direction as the conveyance direction of the leakproof sheet 3, and is set in a state of being higher than the tension at the time of conveying the leakproof sheet 3 (hereinafter, this state is also referred to as a "high tension state"). Since the exterior sheet 5 in a high tension state is elongated in the conveying direction compared to the exterior sheet 5 to which no tension is applied, the leak-proof sheet 3 is bonded to the exterior sheet 5 in a state where the width of the exterior sheet 5 is reduced.

Then, the bonding sheet is conveyed to a downstream process after the tension applied to the bonding sheet is set to the tension at the time of conveying the leakproof sheet 3. Since the tension applied to exterior sheet 5 after the sheets are bonded to each other is lower than the tension applied to exterior sheet 5 before the sheets are bonded to each other, the high-tension state of exterior sheet 5 is released. Thereby, the width of the exterior sheet 5 is restored to expand in the width direction Y, and the exterior sheet 5 positioned in the non-application portion protrudes with a space from the leakproof sheet 3 to form the ridge portion 51 extending in the application direction of the adhesive. Further, since the exterior sheet 5 positioned in the application section is fixed without being separated from the leakproof sheet 3, the exterior sheet 5 positioned in the application section is a groove 52 extending in the application direction of the adhesive. In this way, the ridge-groove shape 5A extending in one direction is formed in the exterior sheet 5. In the case of manufacturing the diaper 1 in which the ridge-and-groove shape 5A is arranged so as to extend in the longitudinal direction, the bonded sheet including the outer sheet 5 may be cut so that the longitudinal direction of the target diaper 1 coincides with the extending direction of the ridge portions 51 and the groove portions 52, thereby forming the diaper.

In the case of forming the ridge-and-groove shape 5A in the exterior sheet 5 composed of a plurality of sheets, for example, a plurality of adhesive tapes are applied to the inner-layer side sheet constituting the skin-facing surface side of the diaper 1 in the exterior sheet 5, and then the inner-layer side sheet is bonded to the other sheet in a high-tension state. After that, the high tension state of the other sheet is released, and the ridge groove shape 5A is formed in the other sheet. The exterior sheet 5 of the present embodiment preferably uses a through-air nonwoven fabric for at least one other sheet.

According to the absorbent article of the present invention having the above configuration, since the longitudinal groove shape including the ridge portion and the groove portion extending in the longitudinal direction is formed in the crotch region, it is possible to easily move the water vapor generated from the excretory fluid such as urine absorbed and held by the absorbent body from the crotch region toward the front side region and the back side region, as compared with an absorbent article in which the groove shape is not formed. As a result, the uncomfortable feeling and the erroneous recognition of leakage due to the water vapor released to the outside of the absorbent article can be suppressed.

Specifically, since an excretion liquid such as urine is absorbed by the excretion portion-facing portion and the vicinity thereof in the crotch region, the following state is generally adopted: water vapor generated from the discharged liquid is easily generated in the crotch region, and the water vapor is released from the crotch region to the outside of the absorbent article in a large amount. In this regard, according to the present invention, since the longitudinal ridge groove is formed in the crotch region and the ridge portion and the groove portion function as a flow path for water vapor, water vapor generated from the excretory fluid easily moves from the crotch region to the front side region and the back side region, respectively, and diffuses and releases in the front-back direction of the wearer. As a result, the absorbent article of the present invention is less likely to cause condensation of water vapor generated from the excretory fluid when worn. Further, it is possible to reduce the occurrence of wetness of the clothes due to moisture generated by condensation, the induction of leakage of urine from the wearer, uneasiness in leakage of urine, and erroneous recognition of leakage around the legs, waist, and the like. Further, since the release of water vapor in the diaper can be promoted, the wetness during wearing can be reduced. That is, the absorbent article of the present invention can improve the comfort of wearing.

In order to make the above-described effect more remarkable, as shown in fig. 3, in the diaper 1, the longitudinal-direction ridge groove shape 5A having the longitudinal-direction ridge portion 51 and the longitudinal-direction groove portion 52 is preferably formed from the abdomen-side region F to the back-side region R so as to include a region overlapping with the absorbent body 4 in the thickness direction Z in the crotch region M, and more preferably so as to reach both longitudinal-direction edges of the diaper 1. The longitudinal ridge groove shape 5A also more preferably includes a region overlapping with the absorbent body 4 located in each of the ventral region F and the dorsal region R in the thickness direction Z.

As another embodiment different from the embodiments shown in fig. 1 to 4, the embodiment of the diaper 1 on the non-skin-facing surface shown in fig. 5 to 8 is also preferably used. The embodiments to be described below are mainly described as being different from the above-described embodiments, and the description of the above-described embodiments can be appropriately applied to the portions not specifically described. The same reference numerals are given to the same parts as those of the above embodiment, and the description thereof is omitted.

In the embodiment shown in fig. 5, a width direction ridge groove shape 5B is formed on the non-skin-facing surface side of the exterior sheet 5 in the abdomen-side region F, and the width direction ridge groove shape 5B alternately has a plurality of width direction ridge portions 56 and width direction groove portions 57 extending in the width direction Y of the diaper. As shown in the drawing, the widthwise ridge groove shape 5B may be formed in a wavy shape in a plan view of the diaper 1, or may be formed in a straight line shape extending in the widthwise direction. The widthwise ridge groove shape 5B is disposed so as to extend over the central region and both side regions in the widthwise direction Y of the absorbent article 1, and preferably overlaps with the region in which the lengthwise ridge groove shape 5A is formed in the thickness direction Z. The formation region of the widthwise ridge groove shape 5B and the fixing region 7A may or may not overlap each other. With such a configuration, the flow path of the water vapor extending in the width direction Y of the diaper 1 is further formed, so that the water vapor moving from the crotch region M to the abdomen-side region F and the water vapor generated from the abdomen-side region F and the vicinity thereof can be diffused and released in the directions of the abdomen and the waist. As a result, it is possible to reduce the false recognition of the leakage particularly at the abdomen.

In the embodiment shown in fig. 6, the width direction ridge groove shapes 5B having the width direction ridge portions 56 and the width direction groove portions 57 alternately are formed on the non-skin-facing surface side of the exterior sheet 5 in the abdomen-side region F and the back-side region R, respectively. Each of the widthwise ridge groove shapes 5B shown in the figure is formed into a wavy shape in a plan view of the diaper 1, as in the embodiment shown in fig. 5.

The widthwise ridge groove shape 5B is disposed so as to extend over the central region and both side regions in the widthwise direction Y of the absorbent article 1, and preferably overlaps with the region in which the lengthwise ridge groove shape 5A is formed in the thickness direction Z. As shown in this figure, regarding the width direction groove shape 5B formed in the back side region R, the formation region of the width direction groove shape 5B overlaps the arrangement position of the fastening tape 7 when viewed along the width direction Y. Alternatively, the widthwise groove shape 5B formed in the back region R may be formed at a position inward in the longitudinal direction from the position where the fastening tape 7 is arranged in a plan view of the diaper 1. With such a configuration, since the flow paths of the water vapor extending in the width direction Y of the diaper 1 are formed on both the front and back sides, the water vapor moving from the crotch region M to the front and back regions F and R and the water vapor generated from the front and back regions F and R and their vicinities can be diffused and released in the respective directions of the front and back direction and the waist circumference direction of the wearer. As a result, it is possible to reduce the false recognition of leakage in the abdomen and the back, in particular. In addition, since sweat of the wearer and water vapor generated therefrom are easily generated in the back region R, the efficiency of evaporation of sweat can be improved, and the stuffiness and wetness during wearing can be further reduced. As a result, the comfort of wearing can be further improved.

In the embodiment shown in fig. 7, a second exterior member separate from the exterior sheet is disposed on the non-skin-facing surface side of the exterior sheet 5, and the width direction ridge groove shape 5B is formed in the second exterior member. The second exterior member shown in the figure is a fastening tape 7B constituting a fixing region 7A of the fastening tape 7. The fastening band 7B is a separate piece from the exterior sheet 5, and is disposed on the non-skin-facing surface side of the abdominal region F. In the present embodiment, the formation region of the widthwise ridge groove shape 5B and the fixing region 7A overlap each other.

The fastening tape 7B has a rectangular shape in plan view, and is disposed so that the longitudinal direction of the fastening tape 7B, the width direction Y of the diaper 1, and the extending direction of the width-direction ridge groove shape 5B are aligned. The fastening tape 7B is joined to at least the central region in the width direction Y of the non-opposing surface in the abdominal region F by a known joining method such as adhesive, heat sealing, or ultrasonic sealing. The fastening band 7B in the present embodiment may be formed with the widthwise ridge-and-groove shape 5B, for example, and then the fastening band 7B may be joined to the exterior sheet 5. With such a configuration, the water vapor generated from the excretory fluid and the sweat can be diffused and released in the direction around the waist portion, and the water vapor released to the outside of the diaper can be prevented from flowing into the diaper again, and as a result, the comfort of the wearer can be improved. In order to make this effect remarkable, the fastening band 7B is preferably disposed so as to overlap the longitudinal ridge groove shape 5A formed in the ventral region F in the thickness direction Z.

In the embodiment shown in fig. 8, a second exterior member (fastening tape 7B) formed with a widthwise ridge-groove shape 5B is disposed on the non-skin-facing surface side of the exterior sheet 5 in the ventral region F. In addition, a width-direction ridge groove shape 5B is further arranged on the non-skin-facing surface side of the exterior sheet 5 in the back-side region R. The width-direction ridge groove shape 5B formed in the back-side region R is formed in a portion of the exterior sheet 5 where the second exterior member is not disposed. In the present embodiment, the width-direction ridge groove shape 5B formed in the back-side region R is formed directly on the exterior sheet 5. With such a configuration, the water vapor generated from the excreted liquid absorbed by the crotch region M can be diffused and released in a plurality of directions, and the water vapor released to the outside of the diaper can be prevented from flowing into the diaper again by the second exterior member. In addition, since the second exterior member is not disposed in the rear region R, the width direction ridge groove shape 5B is formed, and therefore, the efficiency of evaporation of sweat can be improved, and the tightness of wearing can be reduced. As a result, the comfort of wearing can be further improved. In order to make this effect more remarkable, it is also preferable that the width-direction ridge groove shapes 5B formed in the ventral region F and the dorsal region R are formed so as to overlap the length-direction ridge groove shapes 5A extending in the ventral region F and the dorsal region R in the thickness direction Z.

In the embodiment shown in fig. 9, a plurality of blade elastic members 87 extending in the width direction Y are arranged in each of the back-side blade portions Sr, Sr. The wing elastic members 87 are disposed from the air-permeable portion 1T in the back-side wing portion Sr to the leakproof sheet 3 in the absorbent main body 1A, and the wing elastic members 87 extend substantially parallel to each other. For convenience of explanation, the second exterior member (fastening band 7B) formed with the widthwise ridge-groove shape 5B is disposed in the ventral region F, and the widthwise ridge-groove shape 5B is not formed in the dorsal region R in the present embodiment. For example, in the diaper 1, the width-direction ridge groove shape 5B may be formed in both the abdomen-side region F and the back-side region R.

Fig. 10 schematically shows the diaper 1 of the embodiment shown in fig. 9 in a worn state. When the diaper 1 is worn, the abdominal side wing portion Sf and the back side wing portion Sr are disposed so as to overlap each other. More specifically, in a state where the ventral-side wing portion Sf is disposed on the skin-facing surface side and the dorsal-side wing portion Sr is disposed so as to cover the non-skin-facing surface side of the ventral-side wing portion Sf, the hook and loop fastener 7 is fixed to the fastening band 7B serving as the fixing region 7A, and the wearing state is maintained. The ventral flap Sf and the dorsal flap Sr are arranged in this order as viewed from the body surface of the wearer toward the outside.

In this state, it is preferable that a highly air-permeable region 1V having high air permeability exists in a region where the ventral-side wing portion Sf and the dorsal-side wing portion Sr overlap each other. Further, it is also preferable that the high air-permeable region 1V is formed so as to be located in the extending direction of the widthwise ridge groove shape 5B. The high air permeation region 1V is a region where at least the leakproof sheet 3 is not arranged in a worn state of the diaper 1. With this configuration, the water vapor diffusing in the direction along the waist circumference via the widthwise ridge groove shapes 5B is easily released from the high-permeability regions 1V, and therefore, the wetness in the diaper can be further reduced.

The flap elastic member 87 extending in the width direction Y is preferably disposed so as to overlap the high air-permeability region 1V formed by overlapping the ventral and dorsal flap portions Sf and Sr. With such a configuration, the high-permeability regions 1V are easily expanded and contracted along with the elastic members 87 in accordance with the posture change of the wearer, and therefore, the water vapor diffused in the girth direction through the widthwise ridge groove shapes 5B is more easily released from the high-permeability regions 1V, and therefore, the wetness in the diaper can be further reduced.

In order to further improve the above-described effect, the high air-permeability region 1V is preferably formed by overlapping the components of the ventral and dorsal wing portions Sf and Sr with each other less than the number of components of the other portions of the wing portion S, and more preferably by overlapping the air-permeability portions 1T of the ventral and dorsal wing portions Sf and Sr with each other.

In the case where the width direction ridge groove shape 5B is formed in the diaper 1, the cross-sectional area of the width direction groove portion 57 in the longitudinal direction X is preferably larger than the cross-sectional area of the longitudinal direction groove portion 52 in the width direction Y in order to efficiently release the water vapor that has moved from the crotch portion M to the stomach-side portion F in the width direction Y and improve the wearing comfort. In detail, the cross-sectional area of the widthwise groove portion 57 along the longitudinal direction X is preferably 0.5mm²Above, more preferably 0.8mm²The thickness is preferably 10mm or more²Hereinafter, more preferably 5mm²The following. Also, the longitudinal groove partThe cross-sectional area of 52 in the width direction Y is preferably 0.1mm²Above, more preferably 0.3mm²The thickness is preferably 5mm²Hereinafter, more preferably 2mm²The following.

The cross-sectional area of each

groove

52, 57 can be measured, for example, by the following method. The exterior sheet 5 is cut with a sharp razor along a direction orthogonal to the extending direction of the groove portion to be measured at a portion of the exterior sheet 5 where the longitudinal groove portion 52 or the width groove portion 57 is formed, and a cut surface is obtained. The cut surface is observed with a microscope (for example, a digital microscope VHX-1000 manufactured by KEYENCE) at a magnification of 10 to 100 times without load so that a portion where 2 adjacent ridges and a groove portion arranged between the ridges are present is included in a visual field. Next, the contour of the non-skin-facing surface of the ridge portion and the groove portion in the cut surface and the top portion of the ridge portion are identified from the obtained observation image, and the area of the region surrounded by the virtual straight line connecting the top portions of the ridge portion and the contour of the non-skin-facing surface of the ridge portion and the groove portion is measured. The measurement is performed for a groove portion having at least 5 points, and the arithmetic average of the areas is set as the cross-sectional area of the groove portion to be measured. In the case where an external force acts on an external sheet to be measured for a long time, specifically, for example, in the case where the external sheet is assembled to an absorbent article such as a disposable diaper and the absorbent article is stored in a state of being packed in a package, the external sheet is taken out from the absorbent article, left to stand in an environment of normal temperature and pressure for 1 day or more, and then cut with a razor as described above, in order to eliminate the influence of the external force.

In the case where the second exterior member is further provided in a sheet form, the second exterior member is preferably made of a material having a higher air permeation resistance than the exterior sheet 5, from the viewpoint of effectively preventing the water vapor released to the outside of the diaper from flowing into the diaper again.

Specifically, the air permeability resistance of the second exterior member is preferably 0.005kPa · s/m or more, more preferably 0.01kPa · s/m or more, and is preferably 0.2kPa · s/m or less, more preferably 0.1kPa · s/m or less. The air permeation resistance of the exterior sheet 5 is preferably 0.001kPa · s/m or more, more preferably 0.003kPa · s/m or more, and is preferably 0.1kPa · s/m or less, more preferably 0.05kPa · s/m or less. The AIR PERMEABILITY resistance can be measured, for example, by using AUTOMATIC AIR-PERMEABILITY TESTER KES-F8-AP1 (AIR PERMEABILITY tester) manufactured by KATO TECH. A large value of the air permeation resistance obtained by the above-described measurement method means that it takes time for air to pass through, and therefore means that the air permeability of the material to be measured is low.

When the second exterior member is the fastening tape 7B, the fastening tape 7B is preferably made of a material capable of fixing the fastening tape 7, and for example, a fiber sheet such as various nonwoven fabrics similar to the exterior sheet 5, a resin film, or the like can be used. From the viewpoint of enhancing air permeability, it is preferable to use a fibrous sheet such as various nonwoven fabrics similar to the exterior sheet 5.

The width direction groove portions 57 in the width direction ridge groove shape 5B are preferably formed by compacting the constituent material forming the width direction ridge groove shape 5B. Since the portions having a high density and the portions having a low density of the constituent material are formed at regular intervals by the widthwise groove portions 57 being compressed, the efficiency of releasing water vapor to the outside of the diaper can be maintained, and the water vapor released to the outside of the diaper can be prevented from flowing into the diaper again, and as a result, the comfort of the wearer can be improved. When the widthwise groove portions 57 are formed by the compression, the widthwise ridge portions 56 located between the widthwise groove portions 57 are not compressed or are compressed to a lesser extent than the widthwise groove portions 57.

In order to form such a widthwise ridge groove shape 5B, for example, embossing processing may be performed on a constituent member or a constituent material to be formed, or processing of shaping by pressing against a mold or a member having a shape complementary to a desired shaping shape may be performed. When diapers 1 in which the second exterior member having the width direction ridge groove shape 5B is formed in the abdomen-side region F are stored in a plurality of adjacent and compressed states when the diapers are distributed to the market, the second exterior member in one diaper 1 comes into contact with and is pressed against the exterior sheet of the other diaper 1. In this way, in the process of distribution to the market, a shape complementary to the widthwise ridge-and-groove shape 5B formed in the second exterior member can be formed in the back-side region R of the other diaper 1.

In order to reduce the unpleasant feeling and the erroneous recognition of leakage caused by water vapor released to the outside of the diaper and to improve the feel of the diaper, the number of each of the ridge portions 51 and the groove portions 52 constituting the ridge-and-groove shape 5A is preferably 8 pieces/10 cm or more, more preferably 16 pieces/10 cm or more, and further preferably 100 pieces/10 cm or less, and further preferably 80 pieces/10 cm or less, independently. The number of the ridge portions 51 and the groove portions 52 can be appropriately adjusted by changing the application width of the adhesive applied in a line shape to the exterior sheet 5 and the interval between the rows of the adhesive, for example. The number of the ridge portions 51 and the groove portions 52 is counted as follows: when a virtual straight line extending in a direction orthogonal to the extending direction of the ridge portions 51 and the groove portions 52 is drawn at an arbitrary position where the ridge portions 51 and the groove portions 52 are present in a plan view of the sheet, the number of the ridge portions intersecting the virtual straight line is defined as the number of the ridge portions 51, and the number of the groove portions intersecting the virtual straight line is defined as the number of the groove portions 52, whereby the number of the ridge portions 51 and the number of the groove portions 52 present on the virtual straight line per 10cm are obtained. When the number of the ridge portions 51 and the number of the grooves 52 are different depending on the position where the virtual straight line is drawn, the maximum number of the ridge portions 51 is defined as the number of the grooves 52 present per 10cm or the number of the grooves 51 present per 10 cm.

From the same viewpoint, the height H1 (see fig. 11 (a)) of the longitudinal ridge portion 51 is preferably 0.2mm or more, more preferably 0.4mm or more, and further preferably 3mm or less, and more preferably 2mm or less. The height H1 of ridge portion 51 is the distance between the surface of outer sheet 5 on which groove portion 52 is formed and the upper surface of the top of ridge portion 51. The height H1 of the ridge portion 51 can be appropriately adjusted by changing the application width of the adhesive applied in a line shape to the exterior sheet 5 and the interval between the rows of the adhesive, changing the constituent material of the exterior sheet 5, or changing the tension of the exterior sheet 5 applied in a high tension state, for example.

From the same viewpoint, the total width W1 (see fig. 11 (a)) of the longitudinal ridge portion 51 in the width direction Y is preferably 0.2mm or more, more preferably 0.4mm or more, further preferably 12mm or less, and further preferably 6mm or less. The full width W2 (see fig. 11 (a)) of the longitudinal groove portion 52 along the width direction Y is preferably substantially absent (i.e., the full width W2 is zero), more preferably exceeds 0mm, even more preferably 0.2mm or more, and further preferably 5mm or less, even more preferably 2mm or less. The respective full widths W1, W2 can be adjusted as appropriate by changing the width of the adhesive applied to the exterior sheet 5 or the interval between the adhesive rows, for example.

The height H1, the full width W1, and the full width W2 can be measured by, for example, the following methods. That is, the sample on which the ridge portions 51 and the groove portions 52 were formed was cut with a sharp razor in a direction orthogonal to the extending direction of the ridge portions 51 and the groove portions 52, the cut surface thereof was observed with the microscope, the shortest distance between the non-skin-facing surface on which the groove portions 52 were formed and the upper surface (non-skin-facing surface) of the top portions of the ridge portions 51 was measured, and the obtained value was taken as the height H1 of the ridge portions. In the cut surface, boundary points between the ridge portions 51 and the groove portions 52 are identified on the basis of the contour lines of the ridge portions 51 and the groove portions 52 on the non-skin-facing surface, the shortest distance between the boundary points measured so as to be spaced apart from the ridge portions 51 (see fig. 11 a) is defined as a full width W1, and the shortest distance between the boundary points measured so as to be spaced apart from the groove portions 52 (see fig. 11 a) is defined as a full width W2. The boundary point is a point at the boundary between a straight line extending along the contour of the groove portion from a convex shape and a straight line observed in the cut surface, and a point at the boundary between the straight line and the convex shape, and can be specified by finding an inflection point from a tangent line drawn to the contour of the ridge portion 51 and the groove portion 52. When the boundary point cannot be specified, the intersection point of a virtual straight line connecting the midpoints of the heights H1 of the ridge portions 51 and the contour line of the ridge portion 51 on the non-skin-facing surface is measured as the boundary point, and the shortest distance between the measured boundary points is set to the full width W1 and the full width W2 is set to zero. In the case where an external force acts on the exterior sheet to be measured for a long time, specifically, for example, in the case where the absorbent article is assembled to a disposable diaper or the like and stored in a state of being packed in a package, the exterior sheet is taken out from the absorbent article in order to eliminate the influence of the external force, left to stand in an environment of normal temperature and pressure for 1 day or more, and then cut with a razor as described above.

In addition, from the viewpoint of reducing the false recognition of the uncomfortable feeling or leakage caused by the water vapor released to the outside of the diaper and improving the hand feeling of the diaper, the number of each of the widthwise ridges 56 and the widthwise grooves 57 constituting the widthwise ridge groove shape 5B is preferably 5 or more/10 cm, more preferably 10 or more/10 cm, further preferably 50 or less/10 cm, and further preferably 30 or less/10 cm, independently. The number of the width direction ridges 56 and the width direction grooves 57 can be adjusted by, for example, appropriately changing the processing dimension in the shaping of the width direction ridge groove shape. The number of the width direction ridge portions 56 and the width direction groove portions 57 is counted as follows: when a virtual straight line extending in a direction orthogonal to the extending direction of the width direction ridge portions 56 and the width direction groove portions 57 is drawn in a sheet plan view, the number of ridge portions intersecting the virtual straight line is defined as the number of width direction ridge portions 56, and the number of groove portions intersecting the virtual straight line is defined as the number of width direction groove portions 57, and the number of width direction ridge portions 56 and the number of width direction groove portions 57 present on the virtual straight line of 10cm is determined. When the number of the width-direction ridge portions 56 and the number of the width-direction groove portions 57 are different depending on the positions where the virtual straight lines are drawn, the maximum number of the width-direction ridge portions 56 per 10cm or the number of the width-direction groove portions 57 per 10cm is defined as the number of the width-direction ridge portions 56 per 10 cm.

From the same viewpoint, the full width W3 (see fig. 11 (b)) of the widthwise ridge portion 56 along the longitudinal direction X is preferably 1mm or more, more preferably 2mm or more, and further preferably 10mm or less, and more preferably 5mm or less. The full width W4 (see fig. 11 (b)) of the widthwise groove portion 57 along the longitudinal direction X is preferably substantially absent (i.e., the full width W4 is zero), more preferably exceeds 0mm, even more preferably 0.5mm or more, further preferably 3mm or less, and even more preferably 1.5mm or less. The full widths W3 and W4 can be adjusted by appropriately changing the machining dimension in the shaping of the widthwise ridge groove shape, for example. The full widths W3 and W4 were set as the minimum lengths in the measurement.

The above-mentioned full widths W3 and W4 can be measured by, for example, the following methods. That is, the cut surface is observed with the microscope by cutting with a sharp razor in a direction orthogonal to the extending direction of the widthwise ridge portion 56 and the widthwise groove portion 57. The shortest distance between the non-skin-facing surface forming the widthwise groove portion 57 and the upper surface (non-skin-facing surface) of the top portion of the widthwise ridge portion 56 is measured, and the obtained value is set as the height of the widthwise ridge portion 56 (not shown). In the cut surfaces, boundary points between the width-direction ridges 56 and the width-direction grooves 57 are identified on the basis of the contour lines of the width-direction ridges 56 and the width-direction grooves 57 on the non-skin-facing surface, the shortest distance between the boundary points measured across the width-direction ridges 56 (see fig. 11 (b)) is defined as the full width W3, and the shortest distance between the boundary points measured across the width-direction grooves 57 (see fig. 11 (b)) is defined as the full width W4. The boundary points may be determined in the same manner as described above. When the boundary points are not clear, the intersection points of the virtual straight lines connecting the respective midpoints of the heights of the respective widthwise ridges 56 and the contour lines of the widthwise grooves 57 on the non-skin-facing surface are measured as boundary points, and the shortest distance between the measured boundary points is set to the full width W3 and the full width W4 is set to zero. In the case where an external force acts on the exterior sheet to be measured for a long time, specifically, for example, in the case where the absorbent article is assembled to a disposable diaper or the like and stored in a state of being packed in a package, the exterior sheet is taken out from the absorbent article in order to eliminate the influence of the external force, left to stand in an environment of normal temperature and pressure for 1 day or more, and then cut with a razor as described above.

The present invention has been described above based on preferred embodiments thereof, but the present invention is not limited to the above embodiments. For example, although the longitudinal ridge groove shape 5A in each embodiment has been described as being linear, it may be modified as long as the effect of the present invention is exhibited, and may be a wave shape or the like. Similarly, although the widthwise ridge groove shape 5B in each embodiment has been described as a wave shape, it may be modified as long as the effect of the present invention can be exhibited, and may be a linear shape or the like, for example.

The following absorbent article is further disclosed with respect to the above-described embodiment of the present invention.

＜1＞

An absorbent article comprising an absorbent main body including a liquid-permeable topsheet, an absorbent body and a leakage-preventive sheet, the absorbent body having a longitudinal direction corresponding to the front-back direction of a wearer and a width direction orthogonal to the longitudinal direction, and including a ventral region, a crotch region and a back region along the longitudinal direction, the absorbent body being disposed from the ventral region to the back region and including a back region

An exterior sheet is disposed on the non-skin-facing surface side of the absorbent body,

the exterior sheet is formed with a longitudinal ridge groove shape having a longitudinal ridge portion and a longitudinal groove portion extending in the longitudinal direction alternately,

＜2＞

The absorbent article according to the above < 1 >, wherein the exterior sheet and the leakproof sheet are bonded at intervals in the width direction in a bonding region extending in the longitudinal direction,

the longitudinal ridge portion is formed to protrude with a space from the leakage preventive sheet.

＜3＞

The absorbent article according to < 2 > above, wherein the longitudinal ridge portion is hollow in a region defined by the exterior sheet and the leakage-preventive sheet.

＜4＞

The absorbent article according to any one of the above items < 1 > to < 3 >, wherein the exterior sheet is a through-air nonwoven fabric.

＜5＞

The absorbent article according to any one of the above items < 1 > to < 4 >, wherein the longitudinal groove shape is formed from the abdomen-side region to the back-side region.

＜6＞

The absorbent article according to any one of the above items < 1 > to < 5 >, wherein a width-direction ridge groove shape having a width-direction ridge portion and a width-direction groove portion extending in the width direction alternately is formed on the non-skin-facing surface side of the exterior sheet in the stomach-side region.

＜7＞

The absorbent article according to any one of the above items < 1 > to < 6 >, wherein the non-skin-facing surface side of the exterior sheet in each of the front side region and the back side region has a widthwise groove shape alternately having widthwise ridges and widthwise grooves extending in the widthwise direction.

＜8＞

The absorbent article according to the above < 6 > or < 7 >, wherein a second exterior member is disposed on a non-skin-facing surface side of the exterior sheet, and the width-direction ridge groove shape is formed in the second exterior member.

＜9＞

The absorbent article according to < 8 > above, wherein the width-direction ridge groove shape in the stomach-side region is formed in a second exterior member disposed on a non-skin-facing surface side of the exterior sheet,

the width direction ridge groove shape in the back region is formed in the outer sheet where the second outer member is not disposed.

＜10＞

The absorbent article according to the above < 8 > or < 9 >, wherein the second exterior member has a higher air permeation resistance than a material constituting the exterior sheet.

＜11＞

The absorbent article according to the above < 10 >, wherein the air permeation resistance of the second exterior member is 0.005kPa · s/m or more and 0.2kPa · s/m or less, preferably 0.01kPa · s/m or more and 0.1kPa · s/m or less.

＜12＞

The absorbent article according to the above < 10 > or < 11 >, wherein the air permeation resistance of the outer sheet is 0.001kPa · s/m or more and 0.1kPa · s/m or less, preferably 0.003kPa · s/m or more and 0.05kPa · s/m or less.

＜13＞

The absorbent article according to any one of the above < 6 > to < 12 >, wherein the number of the width-direction ridge portions and the number of the width-direction groove portions constituting the width-direction ridge groove shape are each independently preferably 5 or more/10 cm, more preferably 10 or more/10 cm, further preferably 50 or less/10 cm, further preferably 30 or less/10 cm.

＜14＞

The absorbent article according to any one of the above items < 6 > to < 13 >, wherein the width of the widthwise ridge portion along the longitudinal direction is 1mm to 10mm, preferably 2mm to 5 mm.

＜15＞

The absorbent article according to any one of the above < 6 > to < 14 >, wherein the width of the widthwise groove portion along the longitudinal direction is substantially absent, or preferably exceeds 0mm and is 3mm or less, and more preferably 0.5mm to 1.5 mm.

＜16＞

The absorbent article according to any one of the above < 6 > to < 15 >, wherein the cross-sectional area of the widthwise groove portion is larger than the cross-sectional area of the lengthwise groove portion.

＜17＞

The absorbent article according to < 16 >, wherein the transverse cross-sectional area of the widthwise groove along the longitudinal direction is 0.5mm²Above 10mm²Preferably 0.8mm or less²Above 5mm²The following.

＜18＞

The absorbent article according to the above < 16 > or < 17 >, wherein the longitudinal directionThe cross-sectional area of the groove portion along the width direction is 0.1mm²Above 5mm²Preferably 0.3mm or less²Above 2mm²The following.

＜19＞

The absorbent article according to any one of the above items < 6 > to < 18 >, wherein the widthwise groove portions are formed by compressing a material forming the widthwise groove portions.

＜20＞

An absorbent article as described in any of the above < 1 > to < 19 >, comprising:

a pair of abdominal side wing portions extending outward in the width direction of the absorbent main body in the abdominal side region; and

a pair of back-side wing portions extending outward in the width direction of the absorbent main body in the back-side region; and is

A hook and loop fastener is disposed on each of the back-side wing parts,

a fastening tape for fixing the fastening tape is disposed in the ventral region,

and is formed so that the abdominal-side wing part and the back-side wing part overlap each other when the absorbent article is worn,

a high air permeability region is present in a region where the ventral-side wing portion and the dorsal-side wing portion overlap each other.

＜21＞

The absorbent article according to the above < 20 >, wherein an elastic member is disposed on each of the back-side flaps,

the elastic member overlaps with the high air-permeable region in a worn state of the absorbent article.

＜22＞

The absorbent article according to any one of the above items < 1 > to < 21 >, wherein the number of the longitudinal ridge portions is 8 to 100, preferably 16 to 80/10 cm.

＜23＞

The absorbent article according to any one of the above items < 1 > to < 22 >, wherein the number of the longitudinal grooves is 8 to 100/10 cm, preferably 16 to 80/10 cm.

＜24＞

The absorbent article according to any one of the above items < 1 > to < 23 >, wherein the height of the longitudinal ridge portion is 0.2mm or more and 3mm or less, preferably 0.4mm or more and 2mm or less.

＜25＞

The absorbent article according to any one of the above items < 1 > to < 24 >, wherein the width of the longitudinal ridge portion in the width direction is 0.2mm to 12mm, preferably 0.4mm to 6 mm.

＜26＞

The absorbent article according to any one of the above < 1 > to < 25 >, wherein the full width of the longitudinal groove portion in the width direction is substantially absent, or preferably exceeds 0mm and is 5mm or less, and more preferably 0.2mm or more and 2mm or less.

Industrial applicability

According to the present invention, an absorbent article is provided which suppresses a feeling of discomfort or misrecognition of leakage caused by water vapor released to the outside of the absorbent article and improves the comfort when worn.

Claims

1. An absorbent article including an absorbent main body including a liquid-permeable topsheet, an absorber, and a leakage-preventive sheet, the absorbent main body having a longitudinal direction corresponding to a front-back direction of a wearer and a width direction orthogonal to the longitudinal direction, and including a ventral region, a crotch region, and a back region along the longitudinal direction, the absorber being disposed from the ventral region to the back region, the absorbent article being characterized in that:

a longitudinal ridge groove shape is formed in the exterior sheet, the longitudinal ridge groove shape alternately having a longitudinal ridge portion and a longitudinal groove portion extending in the longitudinal direction,

the longitudinal ridge groove shape is formed in a region overlapping with the absorbent body in the thickness direction in the crotch region.

2. The absorbent article of claim 1, wherein:

the exterior sheet and the leakproof sheet are jointed at intervals in the width direction in a joint area extending in the length direction,

the longitudinal ridge portion is formed to protrude with a space from the leakage prevention piece.

3. The absorbent article of claim 2, wherein:

the area formed by dividing the outer sheets and the leakage-proof sheets in the ridge part in the length direction is hollow.

4. The absorbent article according to any one of claims 1 to 3, wherein:

the outer sheet is a hot air non-woven fabric.

5. The absorbent article according to any one of claims 1 to 4, wherein:

the lengthwise ridge groove shape is formed from the ventral region to the dorsal region.

6. The absorbent article according to any one of claims 1 to 5, wherein:

a width-direction ridge groove shape having a width-direction ridge portion and a width-direction groove portion extending in the width direction alternately is formed on a non-skin-facing surface side of the exterior sheet in the ventral region.

7. The absorbent article according to any one of claims 1 to 6, wherein:

the non-skin-facing surface side of the exterior sheet in each of the front-side region and the back-side region has a width-direction ridge groove shape that alternately has a width-direction ridge portion and a width-direction groove portion that extend in the width direction.

8. The absorbent article of claim 6 or 7, wherein:

a second exterior member is disposed on a non-skin-facing surface side of the exterior sheet, and the second exterior member has a width-direction ridge groove shape formed therein.

9. The absorbent article of claim 8, wherein:

the width direction ridge groove shape in the ventral region is formed in a second exterior member disposed on a non-skin-facing surface side of the exterior sheet,

10. The absorbent article of claim 8 or 9, wherein:

the second exterior member has an air permeation resistance higher than that of a material constituting the exterior sheet.

11. The absorbent article of claim 10, wherein:

the second exterior member has an air permeation resistance of 0.005kPa · s/m or more and 0.2kPa · s/m or less.

12. The absorbent article of claim 10 or 11, wherein:

the air permeability resistance of the exterior sheet is 0.001kPa · s/m or more and 0.1kPa · s/m or less.

13. The absorbent article according to any one of claims 6 to 12, wherein:

the number of the width direction ridge portions and the number of the width direction groove portions forming the shape of the width direction ridge groove are respectively and independently 5/10 cm to 50/10 cm.

14. The absorbent article according to any one of claims 6 to 13, wherein:

the width direction ridge portion has a full width in the longitudinal direction of 1mm to 10 mm.

15. The absorbent article according to any one of claims 6 to 14, wherein:

the width of the widthwise groove portion in the longitudinal direction is substantially not present or exceeds 0mm and is 3mm or less.

16. The absorbent article according to any one of claims 6 to 15, wherein:

the cross-sectional area of the widthwise groove portion is larger than the cross-sectional area of the lengthwise groove portion.

17. The absorbent article of claim 16, wherein:

the cross-sectional area of the width direction groove portion along the length direction is 0.5mm²Above 10mm²The following.

18. The absorbent article of claim 16 or 17, wherein:

the cross-sectional area of the longitudinal groove portion along the width direction is 0.1mm²Above 5mm²The following.

19. The absorbent article according to any one of claims 6 to 18, wherein:

the width direction groove portion is formed by compacting a material forming the width direction groove portion.

20. An absorbent article as defined in any of claims 1-19, comprising:

a pair of back-side wing portions extending outward in the width direction of the absorbent main body in the back-side region, respectively; and is

A hook and loop fastener is disposed on each of the back-side wing portions,

the absorbent article is formed such that the abdominal-side wing portion and the back-side wing portion overlap each other in a worn state of the absorbent article,

a highly breathable region exists in a region where the ventral-side flap portion and the dorsal-side flap portion overlap each other.

21. The absorbent article of claim 20, wherein:

an elastic member is disposed on each of the back-side wing portions,

22. The absorbent article according to any one of claims 1 to 21, wherein:

the number of the ridge parts in the length direction is more than 8/10 cm and less than 100/10 cm.

23. The absorbent article according to any one of claims 1 to 22, wherein:

the number of the longitudinal grooves is 16 to 80/10 cm.

24. The absorbent article according to any one of claims 1 to 23, wherein:

the height of the ridge part in the length direction is more than 0.2mm and less than 3 mm.

25. The absorbent article according to any one of claims 1 to 24, wherein:

the width of the longitudinal ridge portion in the width direction is not less than 0.2mm and not more than 12 mm.

26. The absorbent article according to any one of claims 1 to 25, wherein:

the full width of the longitudinal groove portion in the width direction is substantially not present, or exceeds 0mm and is 5mm or less.