CN108348373B

CN108348373B - Absorbent article

Info

Publication number: CN108348373B
Application number: CN201680063658.4A
Authority: CN
Inventors: 铃木阳一; 富田美奈; 针生涉
Original assignee: Kao Corp
Current assignee: Kao Corp
Priority date: 2015-11-20
Filing date: 2016-10-28
Publication date: 2021-04-20
Anticipated expiration: 2036-10-28
Also published as: TWI727997B; WO2017086133A1; CN108348373A; JP6170986B2; RU2700955C1; JP2017093733A; TW201722383A

Abstract

The invention provides an absorbent article comprising a front sheet (12) including a composite sheet, a back sheet (13), and an absorbent body (14) disposed between the two sheets, wherein the composite sheet (1) has a first direction (X) in the longitudinal direction of the article and a second direction (Y) in the width direction of the article, the first sheet (1) and the second sheet (2) which are stacked are joined at a plurality of joining portions, the first sheet (1) is formed with a convex portion (4) protruding toward the skin of the wearer and protruding in a direction away from the second sheet (2) except for the joint portion, in the composite sheet (10), a plurality of continuous protrusions (40) extending in the second direction (Y) are formed at intervals in the first direction (X) as the protrusions (4), and the plurality of continuous protrusions (40) have curved portions that curve convexly toward one end side in the longitudinal direction of the article (100).

Description

Absorbent article

Technical Field

The present invention relates to an absorbent article such as a disposable diaper, a sanitary napkin, and an incontinence pad.

Background

Conventionally, as a topsheet of an absorbent article such as a disposable diaper, a sanitary napkin, an incontinence pad, or the like, a sheet having an uneven shape formed by embossing or the like on a skin-side surface facing the skin of a wearer has been known. In addition, the following techniques are also known: by forming the uneven shape on the skin side surface of the topsheet, the contact area with the skin of the wearer is reduced, the air permeability is improved, or the adhesion to the skin is reduced.

In addition, a technique of forming a convex portion and a concave portion extending in a specific direction on a skin side surface of an absorbent article is also known.

For example, patent document 1 describes an absorbent article in which a concave portion extending in the width direction of the absorbent article is formed in an absorbent body, and a portion of a front sheet overlapping the concave portion is arranged so as to extend along the inner surface of the concave portion; patent document 2 also describes the following: an embossed row extending in the width direction of the absorbent article is formed on the skin-side surface of the absorbent article by embossing, and the embossed row is formed in a curved shape protruding toward one end in the longitudinal direction of the absorbent article.

As a three-dimensional sheet usable as a topsheet of an absorbent article, the present applicant has previously proposed the following: the first and second sheets laminated are joined to each other at a plurality of joining portions, and the first sheet projects in a direction away from the second sheet at a portion other than the joining portions, and a projection projecting toward the skin of the wearer is formed (for example, see patent document 3).

Documents of the prior art

Patent document

Patent document 1: japanese patent laid-open No. Hei 11-318976

Patent document 2: japanese patent laid-open No. 2003-230593

Patent document 3: japanese patent laid-open No. 2009-201964

Disclosure of Invention

In patent documents 1 and 2, regarding the convex portions formed between the embossed rows or between the groove portions, since the sheet forming the convex portions is in contact with a member disposed thereunder, the convex portions are inferior in flexibility.

On the other hand, in the three-dimensional sheet described in patent document 3, since the convex portions include portions of the first sheet which are not joined to the absorbent member or the second sheet, the convex portions are soft and have a good tactile sensation to the skin, but it is desired to further improve the flexibility and the air permeability.

The present invention provides an absorbent article having a front sheet including a composite sheet, a back sheet, and an absorbent body disposed between the two sheets.

The composite sheet has a first direction along the longitudinal direction of the article and a second direction along the width direction of the article, and the laminated first sheet and second sheet are joined to each other at a plurality of joining portions. The first sheet projects in a direction away from the second sheet at a portion other than the joining portion, and a projection projecting toward the skin of the wearer is formed.

In the composite sheet, a plurality of continuous projections extending in the second direction are formed as the projections at intervals in the first direction.

The plurality of continuous protrusions have curved portions that are convexly curved toward the front end side or the rear end side in the longitudinal direction of the article when the composite sheet is viewed in plan.

Drawings

Fig. 1 is a plan view showing a basic structure of a disposable diaper which is one embodiment of the absorbent article of the present invention.

Fig. 2 is a sectional view taken along line II-II of fig. 1.

Fig. 3 is a plan view showing a topsheet (composite sheet) of the disposable diaper according to the first embodiment.

Fig. 4 is an enlarged perspective view of a part of the composite sheet used as the front sheet in the first embodiment.

Fig. 5 is a partially enlarged plan view of fig. 3.

Fig. 6 is a schematic sectional view taken along line VI-VI of fig. 5.

Fig. 7 is a schematic plan view for explaining a preferable size and arrangement of continuous protrusions of the composite sheet used in the first embodiment.

Fig. 8(a) to 8(c) are schematic plan views (corresponding to fig. 7) showing another mode of the continuous convex portion in the present invention.

Fig. 9 is an enlarged plan view of the vicinity of the boundary between the central region and the side region of the composite sheet used in the first embodiment.

Fig. 10 is an enlarged plan view showing a part of the composite sheet used in the second embodiment, which is disposed in the crotch portion, in an enlarged manner.

Detailed Description

The present invention relates to an absorbent article which can eliminate the drawbacks of the prior art described above.

Hereinafter, the present invention will be described based on preferred embodiments thereof with reference to the accompanying drawings.

Fig. 1 and 2 show a basic structure of a disposable diaper 100 (hereinafter, also simply referred to as a diaper 100) as an embodiment of the absorbent article of the present invention.

As shown in fig. 1 and 2, the diaper 100 includes a liquid-permeable front sheet 12, a liquid-impermeable back sheet 13, and an absorbent body 14 disposed between the two

sheets

12, 13. The liquid impermeability of the back sheet 13 is a concept including liquid impermeability, and the back sheet 13 may include a sheet having water repellency and the like, as well as a case where the back sheet 13 does not allow liquid to pass at all.

The diaper 100 has: an article longitudinal direction Xa which is a direction coinciding with the front-rear direction of the wearer when worn; and an article width direction Ya orthogonal to the article longitudinal direction Xa in a state where the diaper 100 is spread in a planar shape as shown in fig. 1. The diaper 100 has, in the article longitudinal direction Xa, a stomach-side portion a disposed on the stomach side of the wearer when worn, a back-side portion B disposed on the back side of the wearer when worn, and a crotch portion C located between the stomach-side portion a and the back-side portion B. The diaper 100 is an open-type disposable diaper, and has fastener tapes 17 provided on both side edges of a back portion B, and a fastening region 18 for fixing the fastener tapes 17 provided on an outer surface of a front portion a.

The absorbent body 14 of the diaper 100 includes an absorbent core 14a and a core-spun sheet 14b wrapping the absorbent core 14 a. The absorbent core 14a may be formed of a fiber stack of liquid-absorbent fibers such as pulp fibers, or a mixed fiber stack of liquid-absorbent fibers and a water-absorbent polymer. Examples of the liquid-absorbent fibers include cellulose-based hydrophilic fibers such as pulp fibers, rayon fibers, cotton fibers, and cellulose acetate. In addition to the cellulose-based hydrophilic fibers, fibers obtained by hydrophilizing fibers made of synthetic resins such as polyolefin, polyester, and polyamide with a surfactant or the like can be used. As the core-wrapped sheet 14b, for example, tissue paper or water-permeable nonwoven fabric can be used. The core sheet 14b may be formed by wrapping the entire absorbent core 14a with 1 sheet, or may be formed by wrapping the absorbent core 14a with 2 or more sheets. As the back sheet 13, a liquid impermeable or water repellent resin film, a laminate of a resin film and a nonwoven fabric, or the like can be used.

Sheets 15 for forming three-dimensional gathers having elastic members 15a are disposed on both sides of the diaper 100 in the longitudinal direction Xa, and the three-dimensional gathers that rise toward the skin of the wearer are formed in the crotch portion C in the worn state by contraction of the elastic members 15 a. Further, leg elastic members 16 are disposed in the extended state at the crotch portion C at the portions disposed around the legs, and by contraction thereof, leg gathers are formed in the crotch portion C in the worn state to improve the fit to the legs of the wearer.

The topsheet 12 of the disposable diaper 100 according to the first embodiment is composed of the composite sheet 10 shown in fig. 3.

As shown in fig. 3, the composite sheet 10 has a first direction X along the longitudinal direction (article longitudinal direction) Xa of the diaper 100 and a second direction Y along the width direction (article width direction) Ya of the diaper 100. As shown in fig. 3, the composite sheet 10 has a central region M in which the projections 4 are formed in different patterns, and a pair of side regions S, S located on both sides of the central region M. The central region M is located in the central portion in the width direction (article width direction) Ya of the diaper 100, and the pair of side regions S, S are formed outside both side edges of the central region M in the second direction Y.

Fig. 4 is an enlarged perspective view showing a part of the composite sheet 10, and fig. 5 is an enlarged plan view showing a part of the composite sheet 10. Fig. 4 and 5 show a part of the composite sheet 10 disposed in the crotch portion C. The side regions S are formed at positions that are bilaterally symmetric with respect to a center line Lc along the longitudinal direction Xa of the diaper 100, and the side regions S are formed with irregularities in the same pattern.

As shown in fig. 5 and 6, in the composite sheet 10, the first sheet 1 and the second sheet 2 stacked in the central region M and the side regions S are partially joined by embossing to form a plurality of joined portions 3, and the first sheet 1 and the second sheet 2 stacked in the plurality of joined portions 3 are joined to each other. In either of the central region M and the side regions S, the first sheet 1 projects in a direction away from the second sheet 2 at a portion other than the joining portion 3, and a projection 4 projecting toward the skin of the wearer is formed. In the composite sheet 10, in either the central region M or the side region S, the surface on the second sheet 2 side is substantially flat, and the first sheet 1 side has irregularities with large undulations.

The first sheet 1 and the second sheet 2 are made of sheet material. As the sheet material, for example, a nonwoven fabric, a fiber sheet such as a woven fabric or a knitted fabric, a film or the like can be used, and from the viewpoint of the touch of the skin or the like, a fiber sheet is preferably used, and a nonwoven fabric is particularly preferably used. The types of sheet materials constituting the first sheet 1 and the second sheet 2 may be the same or different.

Examples of the nonwoven fabric in the case where a nonwoven fabric is used as the sheet material constituting the first sheet 1 and the second sheet 2 include a through-air nonwoven fabric, a spunbond nonwoven fabric, a spunlace nonwoven fabric, a meltblown nonwoven fabric, a resin-bonded nonwoven fabric, and a needle-punched nonwoven fabric. A laminate obtained by combining 2 or more kinds of these nonwoven fabrics, or a laminate obtained by combining these nonwoven fabrics with a film or the like can also be used. Among these, a through-air nonwoven fabric or a spunbond nonwoven fabric is preferably used. The grammage of the nonwoven fabric used as the sheet material constituting the first sheet 1 and the second sheet 2 is preferably 10g/m²Above, more preferably 15g/m²The above is preferably 40g/m²Hereinafter, more preferably 35g/m²The following. The grammage of the nonwoven fabric is preferably 10g/m²Above 40g/m²Hereinafter, it is more preferably 15g/m²Above 35g/m²The following.

As the fibers constituting the nonwoven fabric, fibers containing various thermoplastic resins can be used. Examples of the thermoplastic resin include polyolefins such as polyethylene and polypropylene, polyesters such as polyethylene terephthalate, polyamides such as nylon 6 and nylon 66, polyacrylic acid, polyalkyl methacrylate, polyvinyl chloride, and polyvinylidene chloride. These resins can be used alone in 1 kind, or as a blend of 2 or more kinds. The fiber can be used in the form of a core-sheath type or side-by-side (side by side) type composite fiber.

As shown in fig. 4 to 6, a plurality of continuous protrusions 40 continuously extending in the second direction Y are formed in the central region M of the composite sheet 10 at a predetermined distance in the first direction X.

Each of the plurality of continuous protrusions 40 has a curved portion, and the curved portions are curved so as to protrude toward the front end 1a side in the article longitudinal direction Xa, which is the longitudinal direction of the diaper 100, when the composite sheet 10 is viewed in plan. The front end 1a side is a side disposed on the abdominal side of the wearer when worn, and the rear end 1b side is a side facing the back side of the wearer when worn. In the absorbent article having no difference in front and rear, one of both ends in the article longitudinal direction Xa is set as the front side, and the other is set as the rear side. The continuous protrusion 40 in the present invention may have a curved portion that is convexly curved toward the rear end 1b in the article longitudinal direction Xa.

Here, the expression "having a curved portion" includes a case where one curved portion is provided between both

end portions

4s, 4s of the continuous protrusion 40 in the second direction Y as shown in fig. 7, and a case where a plurality of curved portions R are provided between both

end portions

4s, 4s of the continuous protrusion 40 in the second direction Y as shown in fig. 8 (a). The expression "having a curved portion" also includes a case where the continuous protrusion 40 is entirely the curved portion R.

The continuous convex portion 40 of the composite sheet 10 of the present embodiment has one bent portion R between both

end portions

4s, 4 s. Further, the continuous protrusions 40 are curved portions R as a whole, and are curved so as to be convex toward the front end 1a (or the rear end 1 b) in the article longitudinal direction Xa as a whole.

In the composite sheet 10 of the present embodiment, as shown in fig. 3, the convex directions of the curved portions of all the continuous protrusions 40 are uniform. In the examples shown in fig. 8(b) and 8(c), the convex directions of the curved portions of the plurality of continuous protrusions 40 are also uniform.

As shown in fig. 5, in the pair of side regions S, S of the composite sheet 10, first protrusions 41 and second protrusions 42 are formed as protrusions 4 formed by the first sheet 1 protruding in a direction away from the second sheet 2 at a portion other than the joint 3. As shown in fig. 5, the convex portions 4 (the first convex portions 41 and the second convex portions 42) formed in the side region S are formed in a scattered state in a plan view, and are formed in a state of being scattered in the first direction X and the second direction Y, respectively.

The convex portions 4 (the first convex portions 41 and the second convex portions 42) formed in the side region S are formed in a pattern different from the continuous convex portions 40 which are the convex portions formed in the central region M. The expression that the patterns of the convex portions are different includes any of a case where only the arrangement of the convex portions is different, a case where the form of the convex portions is different, and a case where both of them are different. The different arrangement of the convex portions includes the case where the distance between the convex portions is different. The different shapes of the convex portions include different shapes of the convex portions in a plan view.

In the composite sheet 10 of the present embodiment, the arrangement and form of the protrusions are different between the pair of side regions S, S and the central region M.

In addition, the joint portions 3 in the central region M and the side regions S are formed in a state in which the resin constituting the fibers of one or both of the first sheet 1 and the second sheet 2 is melted and solidified, and the first sheet 1 and the second sheet 2 in the joint portions 3 have a higher density than other portions (portions other than the joint portions). That is, the joint 3 of the composite sheet 10 is a thermally fused part formed by integrally heating and pressing the first sheet 1 and the second sheet 2, and the two sheets are bonded to each other by melting of the constituent resin of the fibers of one or both sheets and subsequent solidification. In each joint 3, both the first sheet 1 and the second sheet 2 are preferably melted and solidified. In either of the central region M and the side regions S, the joint 3 may be formed by a joining means other than thermal fusion, for example, an adhesive such as a hot melt adhesive, between the first sheet 1 and the second sheet 2.

In the diaper 100 of the first embodiment, since the composite sheet 10 constituting the front sheet 12 has a plurality of continuous protrusions 40 extending in the second direction Y, the contact area with the wearer's skin is reduced, and breathability is ensured between the sheet and the wearer's skin.

Further, since the continuous protrusions 40 have the bent portions R, the continuous protrusions 40 are less likely to be crushed than the case where the bent portions are not provided. Therefore, even when a wearing pressure is applied during wearing, the continuous protrusions 40 are not easily crushed, and the ventilation paths between the continuous protrusions 40 and the like are stably maintained, so that the diaper 100 is excellent in air permeability and moisture barrier properties.

Further, since the continuous convex portions 40 are bent so that the continuous convex portions 40 are less likely to be crushed, the top portions of the continuous convex portions 40 formed by the first sheet 1 which is not joined to the second sheet 2 are excellent in flexibility and also good in touch with the skin.

Further, since the continuous protrusions 40 of the composite sheet 10 in the first embodiment each have only one bent portion R, there are advantages in that, for example, as shown in fig. 8(a), the continuous protrusions 40 have good followability to the movement of the skin of the wearer in the longitudinal direction and are less likely to rub against the skin of the wearer, as compared with the case where the continuous protrusions 40 have a plurality of bent portions R.

Further, the continuous protrusions 40 in the present embodiment are curved so as to be convex toward the front end 1a in the article longitudinal direction Xa as a whole, and thus have an advantage of being easily fitted to the body of the wearer. Such an effect is also effective when the diaper is curved so as to be convex toward the rear end 1b in the article longitudinal direction Xa, but in terms of being able to easily follow the shape of the bulging abdomen and being more excellent in conformability, it is preferable to curve the diaper so as to be convex toward the front end 1a in the article longitudinal direction Xa as in the diaper 100 of the present embodiment.

Further, it is preferable in terms of preventing the difficulty of crushing each continuous convex portion from decreasing because the convex directions of the curved portions of the plurality of continuous convex portions 40 are aligned so that the curved portions of the adjacent continuous convex portions 40 are in close proximity, and the curved portions function integrally easily as a whole, and the force is dispersed against the stress.

In the diaper 100 of the first embodiment, as shown in fig. 3, the central region M having the projections 4 formed in different patterns and the side regions S, S on both sides thereof are formed over the entire length of the diaper 100 in the longitudinal direction, and in the absorbent article of the present invention, the region including the plurality of continuous projections 40 having the curved portion R may be formed only at any portion in the longitudinal direction of the article, for example, only at the crotch portion C, only at the abdominal side portion a, or only at the back side portion B.

The plurality of continuous protrusions 40 having the curved portions R are preferably formed at least in the crotch portion C in the longitudinal direction Xa of the diaper 100 so that the continuous protrusion region which is less likely to be crushed is located in the vicinity of the excretion point, and therefore, the ventilation path (continuous recess) formed in this region can function effectively to remove the factor of wetness.

In addition, from the viewpoint of bringing the continuous convex portion region which is less likely to be crushed closer to the excretion point, the plurality of continuous convex portions 40 having the curved portion R are preferably formed at least in the widthwise central portion of the crotch portion.

The region including the plurality of continuous protrusions 40 having the curved portion R is more preferably formed from the crotch portion C to either or both of the stomach-side portion a and the back-side portion B, or is formed over the entire length of the absorbent body 14, and is more preferably formed over the entire length of the diaper 100.

As shown in fig. 5, embossed regions E, which are curved similarly to the continuous protrusions 40, are formed between the continuous protrusions 40 in the central region M of the composite sheet 10. In other words, the continuous protrusions 40 and the embossed regions E that are not joined between the first sheet 1 and the second sheet 2 are alternately arranged in the first direction X. In the embossed region E, a first joint portion 31 and a second joint portion 32 are formed as a joint portion 3 formed by partially joining the first sheet 1 and the second sheet 2 stacked by embossing.

The first joint 31 has a rectangular shape elongated in the first direction X, and 4 second joints 32 each having a square shape with 1 side having the same length as the short side of the rectangular shape of the first joint 31 are disposed in the vicinity of the first joint 31 with their respective corners facing 4 corners of the first joint 31. Thus, a set of joint portions 30 including 1 first

joint portion

31 and 4 second joint portions 32 located therearound is formed. In each embossed region E, the joint portion groups 30 having the same configuration are arranged at regular intervals in the second direction Y so as to form rows curved similarly to the continuous protrusions 40, and third joint portions 33 having the same shape as the second joint portions 32 are interposed between the adjacent joint portion groups 30.

In the embossed region E of the central region M of the composite sheet 10 used in the first embodiment, the groove portions 5 (see fig. 6) having a height lower than the continuous protrusions 40 on both sides of the embossed region E are formed, and the inside of the groove portions 5 serves as a main ventilation path.

Further, from the viewpoint of guiding the wetness sensation factor to the absorbent body end in a shorter distance and time without causing wetness sensation to stagnate, the continuous protrusions 40 are preferably formed so as to extend substantially in the second direction.

In the central region M of the composite sheet 10, the first to third joint portions 31 to 33 and the portions of the first sheet 1 corresponding to the continuous protrusions 40, which are pressed from the back side or sucked from the front side in the production of the composite sheet 10, are formed in the embossed region E formed in a predetermined pattern in the above-described manner, and the continuous protrusions 40 having the planar shape and the sectional shape shown in fig. 5 and 6 are formed in the central region M of the composite sheet 10.

In addition, in the side region S of the composite sheet 10, the joint portion 3 and the portions corresponding to the first convex portions 41 or the second convex portions 42 of the first sheet 1, which are pressed from the back side or sucked from the front side at the time of manufacturing the composite sheet 10, are formed as shown in fig. 5, so that the first convex portions 41 and the second convex portions 42 protruding toward the skin side in the plan view shape shown in fig. 5 are formed in the side region S of the composite sheet 10.

In the composite sheet 10 used in the first embodiment, the groove portions 5 having a lower height than the continuous protrusions 40 on both sides of the embossed region E are formed in the embossed region E of the central region M. As shown in fig. 9, in the side region S, the continuous grid-shaped concave portions 5S are formed between the convex portions 4 (the first convex portions 41 and the second convex portions 42), and in the side region S, the air flows in a plurality of directions along the grid-shaped concave portions 5S.

By forming the groove portions 5 for circulating air in the width direction in the center portion in the width direction of the absorbent article, and forming the grid-like concave portions 5S for circulating air in a plurality of directions in the side regions S, the wetness sensation factors generated in the center region M can be guided to the side regions S, rapidly separated from the center portion, and diffused from the center portion to other portions, thereby being guided to the absorbent body edge portion without staying. In addition, it is preferable that the entire or a part of the side region S in the article width direction is covered with the three-dimensional gather forming sheet 15 or the three-dimensional gather in a state where the diaper 100 is spread out in a planar shape as shown in fig. 1.

In addition, in terms of uniformly applying the external force to the continuous convex portions 40, the continuous convex portions 40 preferably have a shape that is bilaterally symmetrical with respect to a center line Lc extending in the longitudinal direction Xa of the diaper 100 (article), as shown in fig. 5. In order to prevent the continuous protrusions 40 from being crushed due to unidirectional concentration of external force such as stress during wearing, it is preferable to apply the external force uniformly.

From the viewpoint of more reliably achieving one or two or more of the above-described effects, the convex portion of the composite sheet preferably has the following configuration.

The height H1 (see fig. 6) of the maximum height portion of the continuous protrusions 40 formed in the central region M is preferably 0.5mm or more, more preferably 1.0mm or more, and further preferably 10mm or less, more preferably 5.0mm or less, and further preferably 0.5mm or more and 10mm or less, and further preferably 1.0mm or more and 5.0mm or less.

The height of the first convex portion 41, which is the highest-height convex portion formed in the side region S, is preferably 0.3mm or more, more preferably 0.6mm or more, and is preferably 4.0mm or less, more preferably 3.0mm or less, and is preferably 0.3mm or more and 4.0mm or less, and more preferably 0.6mm or more and 3.0mm or less.

The height of the projection 4 of the composite sheet is defined as the distance from the lower surface of the second sheet 2 to the upper surface of the first sheet 1 as shown in fig. 6. The height is set to a value obtained by observing the cross section of each convex portion using a digital microscope (manufactured by Keyence) and measuring the shortest distance between the lower surface of the second sheet 2 and the top of the convex portion.

The length L1 (see fig. 7) of the continuous projection 40 in the second direction Y is preferably 0.9 times or more, more preferably 5 times or more, further preferably 50 times or less, more preferably 25 times or less, further preferably 0.9 times or more and 50 times or less, and further preferably 5 times or more and 25 times or less the length L2 (see fig. 7) in the first direction X.

The maximum depth d (see fig. 7) of the curved concave portion C4 of the continuous protrusion 40 is preferably 10% or more, more preferably 15% or more, further preferably 90% or less, further preferably 70% or less, further preferably 10% or more and 90% or less, and further preferably 15% or more and 70% or less of the length L2 (see fig. 7) of the continuous protrusion 40 in the first direction X.

The pitch P (distance between the same positions) between the continuous protrusions 40 adjacent to each other in the first direction X is preferably 15% or more, more preferably 100% or more, further preferably 300% or less, more preferably 200% or less, further preferably 15% or more and 300% or less, and further preferably 100% or more and 200% or less of the length L2 (see fig. 7) of the continuous protrusions 40 in the first direction X.

The length L1 (see fig. 7) of the continuous projection 40 in the second direction Y is preferably 20% or more, more preferably 30% or more, further preferably 90% or less, further preferably 50% or less, further preferably 20% or more and 90% or less, and further preferably 30% or more and 50% or less of the minimum width L (see fig. 1) of the crotch portion C of the diaper 100 (absorbent article). The length L1 (see fig. 7) of the continuous projection 40 in the second direction Y is preferably 20mm or more, more preferably 50mm or more, and preferably 200mm or less, more preferably 100mm or less, and preferably 20mm or more and 200mm or less, and more preferably 50mm or more and 100mm or less.

In the production of the composite sheet 10 having the above-described structure, in the same manner as in the method described in japanese patent laid-open No. 2015-112343, the strip-shaped first sheet 1 is fed between the first roller and the second roller having circumferential surfaces in mesh with each other, the first sheet 1 is deformed into a concave-convex shape, the first sheet 1 is moved from the mesh portion along the circumferential surface portion of the first roller, the second sheet 2 is fed so as to overlap the first sheet 1, and the two sheets 1 and 2 are sandwiched between the convex portion of the first roller and the heating roller under heating to be partially joined. In this case, the uneven shape of the first roller and the second roller and the pattern of the joint formed by the first roller and the heat roller are made different between the center portion and the side portion of the first sheet. When the first sheet 1 is nipped into the meshing portion between the first roll and the second roll and deformed into the uneven shape, it is preferable to suck the first sheet in the roll inner direction to promote the deformation of the first sheet 1 into the uneven shape.

Next, a second embodiment of the present invention will be explained.

A disposable diaper as an absorbent article of the second embodiment uses, as a composite sheet constituting a front sheet, a composite sheet having a central region M and side regions S in which projections and joints are formed in a pattern shown in fig. 10, instead of the central region M and the side regions S of the composite sheet 10.

In the central region M of the composite sheet shown in fig. 10, as in the composite sheet 10, a plurality of continuous protrusions 40, which are bent portions as a whole, are formed at intervals in the first direction X. Therefore, the same effect as in the case of using the composite sheet 10 described above can be achieved.

The present invention has been described above based on preferred embodiments of the present invention, but the present invention is not limited to the above embodiments and can be modified as appropriate. For example, the shape and arrangement of each joint portion constituting the embossed region E can be determined as appropriate, and the shape of each joint portion may be any shape such as a circle, an ellipse, an oval, a triangle, a quadrangle, a pentagon, a hexagon, a star, a heart, and a triangle, in addition to a rectangle or a square. The embossed region E sandwiching the continuous protrusions 40 is preferably curved in substantially the same shape as the continuous protrusions 40 as a whole.

The composite sheet of the present invention may have the following two regions: one region is formed with a plurality of continuous convex portions having curved portions convexly curved toward the front end 1a side in the article longitudinal direction Xa, and the other region is formed with a plurality of continuous convex portions having curved portions convexly curved toward the rear end 1b side in the article longitudinal direction Xa.

The absorbent article of the present invention may be a pants-type (pull-on type) disposable diaper instead of an open-type disposable diaper, or may be a pants-type or ordinary non-pants-type sanitary napkin, or may be an incontinence pad, a panty liner, or the like.

The present invention also discloses the following absorbent article according to the above embodiment.

＜1＞

An absorbent article having a front sheet including a composite sheet, a back sheet, and an absorbent body disposed between the sheets,

the composite sheet has a first direction along the longitudinal direction of the article and a second direction along the width direction of the article, and the laminated first sheet and second sheet are joined to each other at a plurality of joining portions, and the first sheet protrudes in a direction away from the second sheet at a portion other than the joining portions, and is formed with a convex portion protruding toward the skin of the wearer,

the composite sheet has a plurality of continuous projections extending in a second direction as the projections at intervals in a first direction,

＜2＞

The absorbent article according to < 1 > above, wherein each of the continuous protrusions has only one of the bent portions.

＜3＞

The absorbent article according to the above < 1 > or < 2 >, wherein the entirety of each of the continuous protrusions is convexly curved toward the front end side or the rear end side in the longitudinal direction of the article.

＜4＞

The absorbent article according to any one of the above items < 1 > to < 3 >, wherein the convex directions of the curved portions of the plurality of continuous protrusions are uniform.

＜5＞

The absorbent article according to any one of the above items < 1 > to < 4 >, wherein the absorbent article has a front side portion disposed on the front side of the wearer when worn, a back side portion disposed on the back side of the wearer when worn, and a crotch portion located between the front side portion and the back side portion, and the plurality of continuous protrusions are formed at least in the crotch portion.

＜6＞

The absorbent article according to any one of the above items < 1 > to < 5 >, wherein the continuous protrusions have a shape that is bilaterally symmetric about a center line extending in the longitudinal direction of the article.

＜7＞

The absorbent article according to any one of the above items < 1 > to < 6 >, which has a central region in which the projections are formed in different patterns from each other and a pair of side regions located on both sides of the central region,

the convex portions (first convex portions and second convex portions) formed in the side regions are formed in a pattern different from the continuous convex portions that are the convex portions formed in the central region.

＜8＞

The absorbent article according to any one of the above items < 1 > to < 7 > having a central region in which the projections are formed in different patterns from each other and a pair of side regions located on both sides of the central region,

the arrangement and form of the convex portions of the composite sheet are different between the central region and the pair of side regions.

＜9＞

The absorbent article according to any one of the above items < 1 > to < 8 > has a central region in which a plurality of the continuous protrusions are formed and side regions located on both sides of the central region, the protrusions are formed in a scattered manner in the side regions, and continuous recesses are formed in a lattice pattern between the protrusions.

＜10＞

The absorbent article according to any one of the above items < 1 > to < 9 >, wherein the central region having the convex portions formed in different patterns and the pair of side regions located on both sides thereof are formed so as to extend over the entire length of the absorbent article in the longitudinal direction.

＜11＞

The absorbent article according to any one of the above items < 1 > to < 10 > has a curved portion that is convexly curved toward a front end side in an article longitudinal direction when the composite sheet is viewed in plan, the article longitudinal direction being a longitudinal direction of the absorbent article, the front end side being a side that is disposed on a wearer's abdominal side when worn.

＜12＞

The absorbent article according to any one of the above items < 1 > to < 11 >, wherein the absorbent article has a front side portion disposed on the front side of the wearer when worn, a back side portion disposed on the back side of the wearer when worn, and a crotch portion located between the front side portion and the back side portion, and the plurality of continuous protrusions are formed at least in the widthwise central portion of the crotch portion.

＜13＞

The absorbent article according to any one of the above items < 1 > to < 12 >, wherein the absorbent article has a stomach-side portion disposed on the stomach-side of a wearer when worn, a back-side portion disposed on the back-side of the wearer when worn, and a crotch portion located between the stomach-side portion and the back-side portion, and the region including the plurality of continuous protrusions having the bent portion is preferably formed from the crotch portion to either or both of the stomach-side portion and the back-side portion.

＜14＞

The absorbent article according to any one of the above items < 1 > to < 13 >, wherein the absorbent article has an absorbent body,

the region including the plurality of continuous protrusions having the bent portion preferably extends over the entire length of the absorbent body, and more preferably over the entire length of the absorbent article.

＜15＞

The absorbent article according to any one of the above items < 1 > to < 14 >, which has a central region in which the projections are formed in different patterns from each other and a pair of side regions located on both sides of the central region,

embossing regions which are curved in the same manner as the continuous protrusions are formed between the continuous protrusions in the central region of the composite sheet,

the continuous protrusions that are not joined between the first sheet and the second sheet are arranged alternately with the embossed regions in the first direction X.

＜16＞

The absorbent article according to any one of the above items < 1 > to < 15 > having a central region in which the projections are formed in different patterns from each other and a pair of side regions located on both sides of the central region,

in the composite sheet, the embossed region in the central region is formed with grooves having a height lower than that of the continuous protrusions on both sides of the embossed region.

＜17＞

The absorbent article according to any one of the above items < 1 > to < 16 > having a central region in which the projections are formed in different patterns from each other and a pair of side regions located on both sides of the central region,

the embossed region sandwiching the continuous convex portion is preferably curved in substantially the same shape as the continuous convex portion as a whole.

＜18＞

The absorbent article according to any one of the above items < 1 > to < 17 > having a central region in which the projections are formed in different patterns from each other and a pair of side regions located on both sides of the central region,

in the joining portions in the central region and the side regions, the resin constituting the fibers of one or both of the first sheet and the second sheet is melted and solidified, and the first sheet and the second sheet in the joining portions have a higher density than other portions (portions other than the joining portions).

＜19＞

The absorbent article according to any one of the above items < 1 > to < 18 >, wherein a nonwoven fabric is used as a constituent of the first componentIn the case of the sheet material of the sheet and the second sheet, the grammage of the nonwoven fabric used as the sheet material constituting the first sheet and the second sheet is preferably 10g/m²Above, more preferably 15g/m²The above is preferably 40g/m²Hereinafter, more preferably 35g/m²The following.

＜20＞

The absorbent article according to any one of the above items < 1 > to < 19 >, which has a central region in which the projections are formed in different patterns from each other and a pair of side regions located on both sides of the central region,

the height of the maximum height portion of the continuous protrusions formed in the central region is preferably 0.5mm or more, more preferably 1mm or more, and preferably 10mm or less, more preferably 5mm or less.

＜21＞

The absorbent article according to any one of the above items < 1 > to < 20 > having a central region in which the projections are formed in different patterns from each other and a pair of side regions located on both sides of the central region,

the height of the first convex portion, which is the highest-height convex portion formed in the side region, is preferably 0.3mm or more, more preferably 0.6mm or more, and is preferably 4mm or less, more preferably 3mm or less.

＜22＞

The absorbent article according to any one of the above items < 1 > to < 21 >, wherein the length of the continuous protrusions in the second direction is preferably 0.9 times or more, more preferably 5 times or more, and preferably 50 times or less, more preferably 25 times or less the length in the first direction.

＜23＞

The absorbent article according to any one of the above < 1 > to < 22 >, wherein the maximum depth of the concavely curved concave portion of the continuous projection is preferably 10% or more, more preferably 15% or more, further preferably 90% or less, and further preferably 70% or less of the length of the continuous projection in the first direction.

＜24＞

The absorbent article according to any one of the above items < 1 > to < 23 >, wherein the pitch P (distance between the same positions) between the continuous protrusions adjacent in the first direction is preferably 15% or more, more preferably 100% or more, further preferably 300% or less, and even more preferably 200% or less of the length of the continuous protrusions in the first direction.

＜25＞

The absorbent article according to any one of the above < 1 > to < 24 >, wherein the absorbent article has a stomach-side portion disposed on the stomach-side of a wearer when worn, a back-side portion disposed on the back-side of the wearer when worn, and a crotch portion located between the stomach-side portion and the back-side portion,

the length L1 of the continuous projection in the second direction is preferably 20% or more, more preferably 30% or more, and further preferably 90% or less, and more preferably 50% or less of the minimum width of the crotch portion of the absorbent article.

Industrial applicability of the invention

According to the absorbent article of the present invention, the top of the continuous projection is soft and the skin touch on the side of the skin is good, and the projection is less likely to be crushed, so that the ventilation path between the projections is stably maintained, and the absorbent article is excellent in air permeability and moisture barrier properties.

Claims

1. An absorbent article characterized by:

comprising a front sheet comprising a composite sheet, a back sheet and an absorbent body disposed between the sheets,

the composite sheet has a plurality of continuous projections formed as the projections in the first direction at intervals and extending in the second direction,

the plurality of continuous protrusions have curved portions that are convexly curved toward the front end side or the rear end side in the longitudinal direction of the article when the composite sheet is viewed in plan,

the absorbent article has a stomach-side portion disposed on the stomach-side of a wearer when worn, a back-side portion disposed on the back-side of the wearer when worn, and a crotch portion located between the stomach-side portion and the back-side portion, and a region including the plurality of continuous protrusions having the bent portion is formed from the crotch portion to either or both of the stomach-side portion and the back-side portion.

2. The absorbent article of claim 1, wherein:

the continuous protrusions each have only one of the curved portions.

3. The absorbent article of claim 1 or 2, wherein:

the entirety of each of the continuous protrusions is curved so as to protrude toward the front end side or the rear end side in the longitudinal direction of the article.

4. The absorbent article of claim 1 or 2, wherein:

the convex orientation of the curved portions of the plurality of continuous protrusions is uniform.

5. The absorbent article of claim 1 or 2, wherein:

the continuous protrusion has a shape that is bilaterally symmetric with respect to a center line extending in the longitudinal direction of the article.

6. The absorbent article of claim 1 or 2, wherein:

has a central region in which the projections are formed in different patterns from each other and a pair of side regions located on both sides of the central region,

the convex portions formed in the side regions are formed in a pattern different from that of the continuous convex portions formed in the central region.

7. The absorbent article of claim 1 or 2, wherein:

the arrangement and form of the projections of the composite sheet are different in the central region and the pair of side regions.

8. The absorbent article of claim 1 or 2, wherein:

the projection display device comprises a central area formed with a plurality of continuous projections and side areas positioned on both sides of the central area, wherein the projections are scattered in the side areas, and grid-shaped continuous recesses are formed between the projections.

9. The absorbent article of claim 1 or 2, wherein:

the absorbent article has a central region having the convex portions formed in different patterns and a pair of side regions located on both sides of the central region, and is formed so as to extend over the entire length in the longitudinal direction of the absorbent article.

10. The absorbent article of claim 1 or 2, wherein:

the absorbent article has a curved portion that is curved so as to project toward a front end side in a longitudinal direction of the article, the longitudinal direction of the article being the longitudinal direction of the absorbent article, the front end side being a side that is disposed on a wearer's abdominal side when worn, in a plan view of the composite sheet.

11. The absorbent article of claim 1 or 2, wherein:

the absorbent article has an absorbent body,

the region including the plurality of continuous protrusions having the curved portion extends over the entire length of the absorbent body.

12. The absorbent article of claim 1 or 2, wherein:

embossing regions which are curved similarly to the continuous projections are formed between the continuous projections in the central region of the composite sheet,

the continuous protrusions that are not joined between the first sheet and the second sheet are arranged alternately with the embossed regions in the first direction.

13. The absorbent article of claim 1 or 2, wherein:

in the composite sheet, the embossed region in the central region is formed with a groove portion having a height lower than that of the continuous protrusions on both sides of the embossed region.

14. The absorbent article of claim 1 or 2, wherein:

the embossed region sandwiching the continuous convex portion is curved in the same shape as the continuous convex portion as a whole.

15. The absorbent article of claim 1 or 2, wherein:

in the joining portions in the central region and the side regions, the resin constituting the fibers of one or both of the first sheet and the second sheet is melted and solidified, and the first sheet and the second sheet in the joining portions have a higher density than those in the portions other than the joining portions.

16. The absorbent article of claim 1 or 2, wherein:

in the case where a nonwoven fabric is used as the sheet material constituting the first sheet and the second sheet, the grammage of the nonwoven fabric used as the sheet material constituting the first sheet and the second sheet is 10g/m²Above 40g/m²The following.

17. The absorbent article of claim 1 or 2, wherein:

the height of the maximum height portion of the continuous protrusions formed in the central region is 0.5mm to 10 mm.

18. The absorbent article of claim 1 or 2, wherein:

the height of the first convex part which is the highest height convex part formed in the side part area is more than 0.3mm and less than 4 mm.

19. The absorbent article of claim 1 or 2, wherein:

the length of the continuous projection in the second direction is 0.9 to 50 times the length in the first direction.

20. The absorbent article of claim 1 or 2, wherein:

the maximum depth of the concavely curved concave portion of the continuous convex portion is 10% to 90% of the length of the continuous convex portion in the first direction.

21. The absorbent article of claim 1 or 2, wherein:

the pitch between the continuous convex portions adjacent in the first direction is 15% to 300% of the length of the continuous convex portions in the first direction.

22. The absorbent article of claim 1 or 2, wherein:

the absorbent article has a stomach-side portion disposed on the stomach-side of a wearer when worn, a back-side portion disposed on the back-side of the wearer when worn, and a crotch portion located between the stomach-side portion and the back-side portion,

the length of the continuous projection in the second direction is 20% to 90% of the minimum width of the crotch portion of the absorbent article.