JP2015213543A - Absorbent article - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an absorbent article combinedly having a stable absorptive power when being worn and favorable use feeling by prevention of liquid leak and stuffiness, capable of fully exerting original absorptive power of an absorbent core, and stably inhibiting leak of liquid such as excretory fluid and stuffiness when being worn.SOLUTION: An absorber 13 includes: an absorbent core 15 extending in the length direction of the absorber 13 and absorbing and holding liquid; and a cover sheet 16 with liquid permeability, wound around the outer peripheral surface of the absorbent core 15, about an axial line in the length direction of the absorber core 15. The cover sheet 16 includes an extension part 18 that extends from an end in the width direction of the absorber core 15 and an inner peripheral surface which is mutually brought into non-contact with a surface on a liquid-permeable sheet 11 side and a surface on a liquid-impermeable sheet 12 side in the absorbent core 15. An absorbent material 19 with liquid absorbing property is bonded to the inner peripheral surface side of the extension part 18 with an adhesive.

Description

  The present invention relates to an absorbent article, and particularly to an absorbent article suitable for use as a disposable diaper.

As an absorbent article, for example, a disposable diaper that absorbs excretory fluid such as urine is a liquid-permeable sheet (so-called top sheet) located on the wearer's skin side and a liquid-impermeable sheet (so-called so-called top sheet). It is common to provide a back sheet) and an absorbent body long in one direction provided between the liquid-permeable sheet and the liquid-impermeable sheet.
And about the said absorber, it adheres to the absorption core in the state which coat | covered the absorption core which absorbs and hold | maintains liquids, such as excretion liquid extended in the length direction of this absorber, and the outer peripheral surface of this absorption core And a coating sheet having liquid permeability.

Since the absorbent core is formed by laminating a water absorbent material such as pulp and a super absorbent material such as a water absorbent polymer, the shape is relatively easily broken. Therefore, the said covering sheet has the function to coat | cover the outer peripheral surface of this absorption core, hold | maintain the shape of the absorption core, and also hold | maintain the shape of the whole absorber.
On the other hand, when the absorbent core absorbs and holds liquid such as excretory liquid, it expands as a whole, but at this time, the covering sheet covering the absorbent core suppresses expansion of the absorbent core, There is a possibility that the expansion may be hindered. As a result, a predetermined amount of liquid cannot be absorbed, and the absorption power of the absorption core may not be sufficiently exhibited.

Therefore, for example, as described in Patent Document 1, the absorbent body absorbs the covering sheet so that space portions separated from the absorbent core are formed at both side ends in the width direction of the absorbent core. It is widely known that it is wound around a core and has a configuration in which no adhesive is applied to the inner peripheral surface of the portion of the covering sheet that forms the space.
In the case of the thing of this patent document 1, since the part of the coating sheet which forms the said space part is not adhere | attached on an absorption core, and does not restrain movement of this absorption core, the absorption core absorbs excretion fluid etc. Even if it expands, the space portion becomes an expansion margin and does not suppress the expansion of the absorbent core. Thereby, there exists an advantage that it is easy to exhibit original absorbency, without inhibiting the absorptivity of an absorption core.

However, since the covering sheet itself is excellent in liquid permeability but poor in absorption, in the case of the one described in Patent Document 1, the portion of the covering sheet that forms the space is almost in the absence of absorption. ing. In the case where some pressure acts, for example, when a wearer of a disposable diaper sits down, the absorbent core may be pushed out and part of the liquid once absorbed, in this case, Since the said covering sheet cannot absorb the liquid which flowed out, it is possible that the liquid leaks out to the exterior of an absorber.
In addition, when the wearer of the disposable diaper sweats, the internal space of the disposable diaper increases due to the absence of the absorption core, and thus the humidity inside the disposable diaper increases and becomes steamed. there is a possibility.

JP 2013-99451 A

  The technical problem of the present invention is that the absorbent core can fully exert its original absorbency, and can stably prevent liquid leakage such as excreta and stuffiness during wearing. It is an object of the present invention to provide an absorbent article that has both a stable absorbing power at the time and a good feeling of use by preventing liquid leakage and stuffiness.

  In order to solve the above problems, an absorbent article according to the present invention includes a liquid-permeable sheet, a liquid-impermeable sheet disposed on one side of the liquid-permeable sheet, and these liquid-permeable sheets and liquid-impermeable sheets. An absorbent article provided with an absorbent body that is long in one direction and disposed between the absorbent sheet and the absorbent body that absorbs and retains liquid that extends in the longitudinal direction of the absorbent body. A core, and a liquid-permeable covering sheet wound around an axis in the length direction of the absorbent core on the outer peripheral surface of the absorbent core, and the covering sheet extends in the width direction of the absorbent core. An extending portion that extends from the end and has an inner peripheral surface side that is not in contact with the liquid-permeable sheet-side surface and the liquid-impermeable sheet-side surface of the absorbent core; Absorbent absorbent material is bonded to the inner peripheral surface of the protruding part with an adhesive A.

  The absorbent core is provided with leg portions that are curved so as to protrude toward the center side in the width direction of the absorbent core at both ends in the width direction, and the covering sheet extends from the leg portions. It is wound around the absorbent core in a state of extending outward in the width direction of the absorbent body, and a portion extending from the leg portion in the covering sheet is the extended portion. be able to.

  In this case, the absorbent article includes a pair of leak-proof walls extending in the length direction of the absorbent body that can rise up on the surface of the liquid-permeable sheet opposite to the absorbent body. In addition, the pair of leak-proof walls can rise from a position corresponding to a portion located closest to the center in the width direction of the absorber in the leg portion of the absorber as a base end portion. It is preferable.

In this invention, the said absorptive material shall be adhere | attached on the whole inner peripheral surface side of the said extension part.
Moreover, in this invention, it is preferable that the said coating sheet shall be wound with the frame shape with respect to the said absorption core.

  Furthermore, in the present invention, the covering sheet has an overlapping portion interconnected by an adhesive in a state where both end portions in the direction wound around the absorbent core are overlapped, and the overlapping portion is The absorbent material is fixed to the liquid permeable sheet side of the absorbent core, and the overlapping material is disposed between the one end side and the other end side of the covering sheet in the direction wound around the absorbent core. It can be arranged.

  In the present invention, the covering sheet has a pair of lengthwise side extending portions extending from both end portions in the lengthwise direction of the absorbent core, and each of the lengthwise side extending portions An absorbent material having liquid absorbency may be adhered to the peripheral surface side with an adhesive.

In this case, the absorbent article has the absorbent body and is joined to a crotch sheet member long in one direction covering the crotch of the wearer and one end side in the length direction of the crotch sheet member. A disposable diaper comprising a ventral sheet member covering the abdomen side of the wearer and a dorsal sheet member covering the back side of the wearer joined to the other end side in the longitudinal direction of the crotch sheet member Because
The ventral sheet member has a plurality of ventral elastic members extending in a direction orthogonal to the length direction of the crotch sheet member and extending along the seat surface of the ventral sheet member, and the back seat The member has a plurality of dorsal elastic members extending in a direction perpendicular to the length direction of the crotch seat member and extending along the seat surface of the dorsal seat member, and a part of the ventral elastic member; At least one of the back elastic member and a portion of the pair of lengthwise side extending portions of the covering sheet overlaps with a position corresponding to the nearest lengthwise side extending portion. It can be arranged.

  At this time, the basis weight of the absorbent material bonded to the inner peripheral surface side of the pair of lengthwise side extending portions is the lengthwise side extending portion located on the ventral sheet member side. It is preferable that there are more than the length direction side extension part located in the back | dorsal sheet | seat member side.

According to the present invention, the covering sheet wound around the outer circumferential surface of the absorbent core around the longitudinal axis of the absorbent core extends from the end in the width direction of the absorbent core, and the inner circumferential surface side is the absorbent core. The core has an extending part that is not in contact with the liquid-permeable sheet-side surface and the liquid-impermeable sheet-side surface of the core, and has an absorbent property on the inner peripheral surface side of the extending part. The absorptive material which has is adhere | attached with the adhesive agent.
Therefore, when the absorbent core expands due to absorption of liquid such as excretory fluid, the extension portion serves as a bulge allowance for the absorbent core, so that the absorbent core does not hinder the expansion of the absorbent core. It becomes possible to fully demonstrate the original absorption power.
Moreover, since the absorbent material is bonded to the inner peripheral surface side of the extending portion, even if the liquid once absorbed from the absorbent core oozes out into the extending portion, the absorbent material The absorbent material absorbs again, and the absorbent material absorbs even if the sweat of the wearer of the absorbent article adheres to the extension. As a result, it is possible to stably suppress liquid leakage such as excretory liquid and stuffiness during wearing.
Therefore, it is possible to simultaneously ensure both a stable absorption power when worn and a good feeling of use due to prevention of liquid leakage and stuffiness.

FIG. 1 is a partially broken perspective view schematically showing an embodiment of a disposable diaper according to the present invention. FIG. 2 is a schematic perspective view of the disposable diaper according to the embodiment of the present invention as viewed from a position different from that in FIG. FIG. 3 is a plan view schematically showing a state where the disposable diaper of FIG. 1 is developed. However, the state seen from the liquid-permeable sheet side of the crotch sheet member is shown. FIG. 4 is a schematic enlarged end view of the main part of the absorber. However, the state which cut | disconnected the center part of the length direction of the absorber in the direction orthogonal to the length direction of this absorber is shown. FIG. 5 is a schematic cross-sectional view of the main part of the absorber at a position different from that in FIG. However, the state which cut | disconnected the absorber at the approximate center part of the thickness direction of this absorber is shown. FIG. 6 is a schematic enlarged cross-sectional view of the main part of the disposable diaper of FIG. 1 cut at the center of the crotch sheet member in the length direction of the crotch sheet member. FIG. 7 shows a state in which the first adhesive application region in the first adhesive part and the second adhesive application region in the second adhesive part are crossed and joined in the state where the disposable diaper of FIG. 1 is developed. FIG. FIG. 8 is a schematic view of an outline of an apparatus for forming a continuous body of absorbent bodies. FIG. 9 is a diagram schematically showing each stage of forming a continuous body of absorber. However, (a) the principal part top view which shows typically the state at the time of the application | coating process in the process of forming the continuous body of an absorber, (b) the principal part top view which shows typically the state at the time of a mounting process, ( c) A perspective view schematically showing the state during the bending step, and (d) a cross-sectional view schematically showing the state during the pressing step. FIG. 10 is a diagram for explaining a process for producing a disposable diaper according to the present invention. FIG. 11 is a schematic enlarged cross-sectional view of an essential part showing an absorber having a form different from that in FIG. However, the state which cut | disconnected the center part of the length direction of the absorber in the direction orthogonal to the length direction of this absorber is shown.

FIGS. 1-7 shows one Embodiment of the absorbent article of this invention, In this embodiment, the case where an absorbent article is a disposable diaper is demonstrated.
That is, the disposable diaper 1 of this embodiment is a so-called three-piece type mainly composed of three substantially rectangular sheet members that respectively cover the wearer's belly side, back side, and crotch.
Specifically, the disposable diaper 1 includes a crotch sheet member 2 that is long in one direction that covers the wearer's crotch, and the crotch sheet member 2 that overlaps the crotch sheet member 2 on one end side in the length direction of the crotch sheet member 2. And a ventral sheet member 3 covering the abdomen of the wearer, which is joined in a state where it is applied.
Further, as a separate member from the abdominal sheet member 3, the back of the wearer is joined to the other end in the longitudinal direction of the crotch sheet member 2 in a state of being overlapped with the crotch sheet member 2. And a back sheet member 4 covering the side.
And the said crotch sheet | seat member 2, the abdominal sheet member 3, and the back | dorsal sheet | seat member 4 are mutually joined by the adhesive agent in the part which each overlapped.

As shown in FIGS. 1 and 2, the disposable diaper 1 is a so-called pants type in which the abdomen sheet member 3 and the back sheet member 4 are joined by various means such as fusion. The disposable diaper 1 has a waist opening 1a formed by the ventral sheet member 3 and the dorsal seat member 4 on the upper side when worn (standing), and on the lower side, the ventral sheet member 3 and The back seat member 4 and the crotch seat member 2 form a pair of leg openings 1b, 1b through which the wearer's leg passes.
In addition, the both ends of the crotch sheet member 2 are covered with a joint between the abdomen sheet member 3 and the back sheet member 4 joined to the crotch sheet member 2 to improve the touch. And the strip-shaped cover sheet | seat member 6 formed with the nonwoven fabric excellent in air permeability is each attached.

The crotch sheet member 2 is formed in a substantially rectangular shape in plan view, extending from the abdominal sheet member 3 through the lower side of the wearer's crotch part toward the back sheet member 4.
The crotch sheet member 2 is located on the skin surface side of the wearer and extends in the length direction of the crotch sheet member 2. The liquid permeable sheet 11 (so-called top sheet) having liquid permeability and the wear A liquid impervious sheet 12 (so-called back sheet) having liquid impermeability and extending in the length direction of the crotch sheet member 2 located on the side opposite to the skin surface side of the person.
Further, the crotch sheet member 2 absorbs and holds excretion fluid such as urine excreted from the wearer, disposed between the liquid permeable sheet 11 and the liquid impermeable sheet 12. An absorbent body 13 extending long in the length direction of the crotch sheet member 2 and a pair of leak-proof walls 14, 14 extending in the length direction of the crotch sheet member 2 along the absorbent body 13 are provided. .
The liquid-impermeable sheet 12, the ventral sheet member 3 and the dorsal sheet member 4 are bonded to each other at the portions where the crotch sheet member 2, the ventral sheet member 3 and the dorsal sheet member 4 are overlapped. It is joined directly by the agent.

  The liquid-permeable sheet 11 is in contact with the wearer's skin and quickly absorbs the wearer's urine and transfers it to the absorbent body 13 in one direction, specifically the length direction of the absorbent body 13. And is formed in a generally rectangular shape in plan view that is larger than the absorber 13 as a whole, and is joined to the absorber 13 by any joining means such as bonding with a hot-melt adhesive. .

The liquid-impermeable sheet 12 prevents permeation of excreted excreted liquid and prevents the excreted liquid from leaking to the outside. By means, the absorber 13 and the liquid permeable sheet 11 are joined to each other.
The liquid-impermeable sheet 12 is formed in a substantially rectangular shape in plan view that is longer in one direction, specifically in the length direction of the absorber 13 and larger than the absorber 13 as a whole. The absorbent body 13 and the liquid-permeable sheet 11 are bonded to each other by any bonding means such as bonding with an adhesive.

Further, the absorbent body 13 has an absorbent core 15 that substantially absorbs and retains excretory fluid, and a liquid-permeable covering sheet 16 that covers the outer surface of the absorbent core 15.
The covering sheet 16 has a substantially rectangular sheet surface in a plan view when deployed, and the outer peripheral surface of the absorbent core 15 (the liquid permeable sheet side and the liquid impermeable sheet side of the absorbent core, and the absorbent core). 15 can be surrounded over the entire circumference of the outer peripheral surface of the absorbent core 15 and wound around the absorbent core 15. At this time, the length in the direction along the length direction of the absorbent core 15 is sufficiently longer than the length in the length direction of the absorbent core 15. In addition, this coating sheet 16 is formed with the tissue etc. which are shape | molded with a wet method by making a pulverized pulp a main material, for example.
On the other hand, the absorbent core 15 includes a water-absorbing material such as pulp and a high-absorbing material such as a water-absorbing polymer, and passes through the lower side of the wearer's crotch from the abdominal sheet member 3 side. It is elongated in the direction of the side sheet member 4, that is, the length direction of the crotch sheet member 2, and is formed in a belt shape having a certain thickness.

Also, as shown in FIGS. 3 and 5, the absorbent core 15 is disposed on both ends in the width direction of the absorbent core 15 so that the absorbent body 13 can easily fit the base of the thigh of the wearer. Leg portions 17 and 17 are formed so as to be convex toward the center in the width direction of the absorbent core 15.
In this embodiment, the leg portions 17 and 17 are formed such that the central portion in the length direction of the absorbent core 15 is the apex of the curved portion. Therefore, the absorption core 15 has a shape in which the central portion in the lengthwise direction is narrowest when the absorption core 15 is viewed from the liquid-permeable sheet 11 side (hereinafter referred to as “plan view”) (so-called “planar view”). Hourglass shape).
Further, the absorbent core 15 has a curved shape with chamfered corners in plan view.

In the present invention, the water-absorbing material forming the absorbent core includes, for example, wood pulp, mercerized pulp or cross-linked pulp, non-wood pulp, regenerated cellulose such as rayon, acetate, etc. obtained from coniferous or hardwood And semisynthetic cellulose.
Examples of the superabsorbent material include starch-based, cellulose-based, and synthetic polymer-based superabsorbent materials. Examples of starch-based or cellulose-based superabsorbent materials include starch-acrylic acid (salt) graft copolymers, and synthetic polymer-based superabsorbent materials include, for example, polyacrylate salts (particularly, , Sodium polyacrylate-based) super absorbent polymer (SAP). Examples of the shape of the superabsorbent material include a particulate shape, a fibrous shape, and a scaly shape. In the case of the particulate shape, the particle size is preferably 50 to 1000 μm, more preferably 100 to 600 μm. .

On the outer peripheral surface of the absorbent core 15, the covering sheet 16 is arranged around the longitudinal axis of the absorbent core 15, that is, the surface of the absorbent core 15 on the liquid permeable sheet 11 side and the liquid impermeable sheet. It is wound so as to surround the surface on the side of the permeable sheet 12 and both end sides in the width direction.
Further, the liquid-permeable sheet 11 side surface and the liquid-impermeable sheet 12 side surface of the absorbent core 15 and the covering sheet 16 are bonded to each other with an adhesive, whereby the absorbent core 15 and The covering sheet 16 is bonded to each other.
As the adhesive, any adhesive can be used as long as the absorbent core 15 and the covering sheet 16 can be securely and stably adhered, and a hot-melt adhesive is most preferable. Examples of the hot-melt adhesive include polyolefin-based, ethylene / vinyl acetate copolymer systems, and synthetic rubber-based adhesives. In addition, as other adhesives, an acrylic resin-based pressure-sensitive adhesive can be used.

Further, in this embodiment, as shown in FIGS. 4 and 5, the covering sheet 16 has a frame shape with respect to the absorbent core 15, that is, each corner of the maximum width portion W of the absorbent core 15. In the portion 15a, the absorbent core 15 is bent along a straight line extending in the length direction of the absorbent core 15 and wraps around the absorbent core 15 from the liquid-impermeable sheet side to the liquid-permeable sheet side. It is rolled up.
Therefore, the covering sheet 16 is wound around the absorbent core 15 so that the absorbent body 13 as a whole has a substantially rectangular shape in plan view.

Here, in the state where the covering sheet 16 is wound around the absorbent core 15, the covering sheet 16 extends from the end portion in the width direction of the absorbent core 15, and the inner peripheral surface side is the liquid permeable sheet 11 side of the absorbent core 15. And the liquid impervious sheet 12 side surface have an extending portion 18 that is not in contact with each other.
In this embodiment, as described above, the covering sheet 16 is wound around the absorbent core 15 in a frame shape so that the absorber 13 as a whole has a substantially rectangular shape in plan view. Since it is wound around the absorbent core 15, the extending portion 18 is in a state where it is formed in a portion where the leg portion 17 of the absorbent core 15 is provided.

That is, the covering sheet 16 is wound around the absorbent core 15 in a state of extending outward from the leg portion 17 in the width direction of the absorber 13, and the leg portion in the covering sheet 16. A portion extending from 17 is the extending portion 18.
More specifically, as described above, the leg portions 17 and 17 are respectively curved so as to protrude toward the center in the width direction of the absorbent core 15. Therefore, the covering sheet 16 extends from the leg portions 17, 17 outward in the width direction of the absorber 13, and the inner periphery of the portions where these leg portions 17, 17 are provided. Extended portions are formed in which the surface side is not in contact with the surface of the absorbent core 15 on the liquid permeable sheet 11 side and the surface on the liquid impermeable sheet 12 side, and these extended portions Are the extension portions 18 and 18.
The extension 18 is not bonded to the absorbent core 15 and does not restrain the movement of the absorbent core 15. In this embodiment, as shown in FIGS. 4 and 5, the inner peripheral surface side of the extending portion 18 is basically not in contact with the absorbent core 15 and is a hollow space. Is formed.

Further, an absorbent material 19 that is liquid-absorbing and separate from the absorbent core 15 is formed on the inner peripheral surface side of the extended portions 18, 18, that is, on the surface side of the absorbent core 15 by an adhesive. It is glued.
The absorbent material 19 is the same material as the water-absorbing material and the superabsorbent material used for the absorbent core 15, and the SAP is particularly preferable. In addition to the SAP, the absorbent material 19 may be pulp, or both SAP and pulp.
The adhesive is the same as the adhesive that bonds the absorbent core 15 and the covering sheet 16 to each other, and a hot-melt adhesive is most preferable.

In this embodiment, the absorbent material 19 is basically bonded to the entire inner peripheral surface of the extending portions 18 and 18. Therefore, when the disposable diaper 1 is worn (when the wearer is standing), the absorbent material 19 is an upward region on the inner peripheral surface side of the extension portions 18, 18, that is, the extension portion. The liquid-impermeable sheet 12 side is bonded to the inner peripheral surface side of the 18,18. Similarly, it is bonded to a downward-facing region on the inner peripheral surface side of the extending portions 18, 18, that is, a region on the liquid permeable sheet 11 side on the inner peripheral surface side of the extending portions 18, 18. Yes. In the present invention, the absorbent material is adhered to the entire inner peripheral surface of the extension portion when the absorbent material is uniformly spread over the entire inner peripheral surface of the extension portion. Of course, the case where it is bonded to the inner peripheral surface in a state of being scattered unevenly over the entire inner peripheral surface of the extending portion is included.
Furthermore, in this embodiment, the absorbent material 19 is disposed in a state where it is also adhered between the liquid permeable sheet 11 side of the absorbent core 15 and the liquid permeable sheet 11, Substantially, the absorbent material 19 is interposed between the absorbent core 15 and the liquid-permeable sheet 11.

Thereby, since the said absorber 13 always has the said absorbent material 19 in the part which contact | connects the said coating sheet 16 in the said liquid permeable sheet 11, the wearer who wore the said disposable diaper 1 is said disposable diaper. When sweat is generated in 1 or the humidity increases, the absorbent material 19 can quickly absorb moisture such as sweat contained in the liquid permeable sheet 11 and the covering sheet 16.
Therefore, the liquid permeable sheet 11 can be maintained in a dry state, and a wet state can be suppressed in the environment in the disposable diaper 1.

Further, the covering sheet 16 has an overlapping portion 20 extending in the length direction of the absorbent body 13 that is mutually connected by an adhesive in a state where both end portions in the direction wound around the absorbent core 15 are overlapped. doing. The overlapping portion 20 is fixed to the liquid permeable sheet 11 side in the absorbent core 15.
Further, in the overlapping portion 20, the absorbent material 19 is disposed between one end side and the other end side in the direction wound around the absorbent core 15 in the covering sheet 16 constituting the overlapping portion 20. Has been.

More specifically, the covering sheet 16 is bent so that both end sides in the winding direction of the absorbent core 15 are along the surface of the absorbent core 15 on the liquid permeable sheet 11 side, and the liquid permeable sheet. The overlapping portion 20 is formed by being overlapped on the surface on the 11th side. Then, the absorbent material 19 is bonded in the overlapping portion 20, that is, between one end side and the other end side in the direction wound around the absorbent core 15 in the covering sheet 16 that forms the overlapping portion 20. It is interposed in the state.
In the case of this embodiment, the overlapping portion 20 is located at the approximate center in the width direction of the absorbent core 15 on the liquid permeable sheet 11 side of the absorbent core 15.

As described above, the disposable diaper 1 is worn because the overlapping portion 20 is disposed on the liquid permeable sheet 11 side in the absorbent core 15 and the absorbent material 19 is disposed in the overlapping portion 20. This is because the absorbent material 19 efficiently absorbs the sweat worn by the worn wearer with the buttocks.
Specifically, since the wearer who wears the disposable diaper is likely to sweat the central portion (cracked portion) in the width direction of the buttocks, the portion covering the wearer's buttocks in the disposable diaper is It is desirable to increase the liquid absorption capacity at the part corresponding to the cracked part.
Therefore, in this embodiment, after the overlapping portion 20 of the covering sheet 16 is arranged on the liquid permeable sheet 11 side of the absorbent core 15, the absorbent material is placed in the overlapping portion 20. By disposing 19, the liquid-absorbing ability of the absorbent body 13 on the liquid-permeable sheet side, which is the position corresponding to the cracked part of the wearer, can be enhanced so that sweat in the cracked part can be efficiently absorbed. I have to. In particular, in this embodiment, since the overlapping portion 20 is located at the approximate center in the width direction of the absorbent core 15 on the liquid permeable sheet 11 side of the absorbent core 15, it is more stable and effective. It is possible to absorb the sweat of the rupture part.

The pair of leak-proof walls 14, 14 rises toward the surface of the liquid-permeable sheet 11 opposite to the absorber 13, that is, toward the skin surface of the wearer when worn, and the tip side is the wearer's skin surface. This is to prevent the excretion fluid from leaking outside between the skin surface of the wearer and the crotch sheet member 2 by coming into contact with the skin surface.
In addition, it is preferable that these pair of leak-proof walls 14 and 14 have hydrophobicity or water repellency so that leakage of excretory fluid can be prevented. For example, depending on materials such as spunbond nonwoven fabric, SMS nonwoven fabric, and air-through nonwoven fabric. Can be configured. Furthermore, elastic members 14a, 14a for leak-proof walls, such as thread-like rubber, extending in the length direction of the leak-proof walls 14, 14 are arranged on the upper ends of the leak-proof walls 14, 14. In addition, the leak-proof walls 14 and 14 are elastically raised, and the leak-proof walls 14 and 14 are easily adhered to the skin surface of the wearer.

The pair of leak-proof walls 14, 14, in a standing state, have base ends on the outer side in the width direction of the crotch sheet member 2 with respect to the positions of both end portions in the width direction of the absorber 13. Placed in position.
In this embodiment, as described above, the leg cores that are curved so that the absorbent core 15 of the absorbent body 13 protrudes toward both ends in the width direction toward the center in the width direction of the absorbent core 15. Since the portions 17 and 17 are provided, the pair of leak-proof walls 14 and 14 has a base end portion that conforms to the shape of the leg under portions 17 and 17 in the portions of the leg under portions 17 and 17. To stand up like that. In particular, with respect to the portion of the leg portion 17, 17 that is located closest to the center in the width direction of the absorber 13, the position corresponding to the portion that is closest to the center in the width direction of the absorber 13 is the base end portion. The pair of leak-proof walls 14 and 14 can stand up in accordance with the shape of the inner crotch portion of the wearer of the disposable diaper 1.

At this time, as shown in FIG. 6, with respect to the extending portion 18, the leakage preventing wall 14 is opposite to the absorber 13 in the liquid permeable sheet 11 as the leakage preventing wall 14 rises. It is pushed up in the direction of the surface side, that is, the skin surface side of the wearer. Further, at that time, the extension portion 18 is in a state in which the space on the inner peripheral surface side of the extension portion 18 is crushed and deformed along the wall surface of the leakage prevention wall 14.
Thereby, since the said extension part 18 becomes a shape along the inner crotch part of the wearer of the disposable diaper 1, the inner crotch part which is one of the parts which are easy to sweat in the wearer who wears this disposable diaper 1 The absorbent material 19 of the extension 18 can absorb the base of the leg and the sweat in the vicinity thereof. As a result, the usability of the disposable diaper 1 can be kept better, and a wet state can be effectively suppressed for the environment in the disposable diaper 1.

By the way, the covering sheet 16 is formed with a pair of lengthwise side extending portions 21 and 22 extending from both end portions in the lengthwise direction of the absorbent core 15 in a state of being wound around the absorbent core 15. Has been.
The pair of lengthwise side extending portions 21 and 22 will be described in detail. As described above, the covering sheet 16 is wound around the absorbent core 15 about the longitudinal axis of the absorbent core 15. The length in the direction along the length direction of the absorbent core 15 is sufficiently longer than the length in the length direction of the absorbent core 15. Accordingly, the covering sheet 16 wound around the absorbent core 15 protrudes from both ends in the length direction of the absorbent core 15 in the direction of the abdominal sheet member and the back sheet member in the absorbent core 15. Thus, an extended portion is formed.
Therefore, these extended portions are extended to the ventral sheet member in the lengthwise direction on the abdomen side, and extended in the lengthwise direction on the back side in the direction of the back sheet member. Part 22.

In this embodiment, the length direction extension portion 21 on the abdomen side and the length direction extension portion 22 on the back side have substantially the same length in the length direction of the absorbent core 15. It has become.
Further, the abdominal length direction side extension portion 21 and the back length direction extension portion 22 are respectively free end sides in the length direction of the absorption core 15 (opposite side to the absorption core 15). At the time when the covering sheet 16 is wound around the absorbent core 15, the end portion located on the side is in an open state (not closed). However, the absorbent body 13 is disposed between the liquid-permeable sheet 11 and the liquid-impermeable sheet 12, and the liquid-permeable sheet 11 and the liquid-impermeable sheet 12 have their peripheral edges. When the portions are joined to each other, the lengthwise free end side of the absorbent core 15 in the lengthwise side extending portion 21 on the ventral side and the lengthwise side extending portion 22 on the dorsal side is also together. It will be joined and closed.

In addition, the absorbent material 19 having liquid absorbency is bonded to the inner peripheral surface side of the pair of lengthwise side extending portions 21 and 22 with an adhesive.
The absorbent material 19 is the same as the water-absorbing material or the superabsorbent material used for the absorbent core 15, that is, adhered to the inner peripheral surface side of the extending portion 18. It is the same as the thing.
The adhesive is the same as the adhesive that bonds the absorbent core 15 and the covering sheet 16 to each other, and a hot-melt adhesive is most preferable.

In this way, a pair of lengthwise side extending portions 21, 22 on the abdominal side and the back side are formed, and the absorbent material 19 is bonded to the lengthwise side extending portions 21, 22 respectively. It absorbs sweat on the stomach and back of the wearer to prevent stuffiness in the disposable diaper 1 and also allows liquid that has oozed out of the absorbent core 15 when the absorbent core 15 is pressed. It is for absorbing and preventing the liquid from leaking out of the disposable diaper 1 from the ventral sheet member 3 side or the dorsal sheet member 4 side.
Thereby, the pair of lengthwise side extending portions 21 and 22 can keep the environment in the disposable diaper 1 together with the extending portion 18 stably in a dry state, and more reliably prevent liquid leakage. Can be prevented.

Here, among the pair of lengthwise side extending portions 21, 22, the abdominal lengthwise side extending portion 21 has a basis weight of the absorbent material 19 bonded to the inner peripheral surface side. More than the lengthwise side extension 22 on the back side.
This is because, for example, when a male wears the disposable diaper 1, excretion fluid such as urine is often excreted on the front side of the wearer, that is, on the abdomen side. It is because it is preferable to make the absorption capacity of excretory fluid as high as possible.
In this embodiment, the abdominal length direction side extension portion 21 is bonded to the inner peripheral surface side more than the back length direction extension portion 22 of the absorbent material 19. Therefore, the absorption capacity of the excretion fluid on the abdominal end side is higher than that of the dorsal side. Thereby, the excretory fluid excreted on the ventral side can be quickly absorbed, and the environment in the disposable diaper 1 can be maintained in a dry state more effectively and stably.

The abdominal sheet member 3 is formed in a substantially rectangular shape extending long in the direction along the width direction of the crotch sheet member 2, that is, in the left and right direction of the wearer at the time of wearing. The length in the length direction is formed larger than the length in the width direction of the crotch sheet member 2.
More specifically, the ventral sheet member 3 includes an inner surface side sheet 26 positioned on the skin surface side of the wearer and an outer surface positioned on the opposite side of the wearer's skin surface, that is, on the outer side of the disposable diaper 1. In the direction along the width direction of the crotch sheet portion 2 material disposed between the side sheet 27 and the inner surface side sheet 26 and the outer surface side sheet 27, that is, in the length direction of the ventral sheet member 3. And a plurality of ventral elastic members 28 extending linearly.

The inner surface side sheet 26 and the outer surface side sheet 27 in the abdominal sheet member 3 are formed in the same shape and size from each other by a non-woven fabric having excellent air permeability. In addition, about the inner surface side sheet | seat 26 and the outer surface side sheet | seat 27, it can form with the nonwoven fabric similar to the liquid permeable sheet 11 of the said crotch part sheet | seat member 2. FIG.
On the other hand, the plurality of ventral elastic members 28 elastically expand and contract in the axial direction, that is, the length direction of the ventral sheet member 3 (the direction along the width direction of the crotch sheet member 2). In the embodiment, rubber formed in a thread shape is used. These abdominal elastic members 28 are arranged in the width direction of the abdominal sheet member 3 at a predetermined interval, that is, in a state of being arranged in the vertical direction when worn (standing position). It is accommodated between the seat 27. In addition, the adhesive agent is apply | coated to the outer peripheral surface of each belly side elastic member 28, and each belly side elastic member 28 is mutually joined with the said inner surface side sheet | seat 26 and the outer surface side sheet | seat 27 with this adhesive agent.

On the other hand, the dorsal seat member 4, like the ventral seat member 3, has a substantially rectangular shape extending long in the direction orthogonal to the length direction of the crotch seat member 2, that is, in the left and right directions of the wearer. It is formed in a shape, and the length in the length direction of the back sheet member 4 is formed larger than the length in the width direction of the crotch sheet member 2.
Specifically, the back sheet member 4 includes an inner surface side sheet 31 positioned on the wearer's skin surface side, and an outer surface side positioned on the opposite side of the wearer's skin surface, that is, on the outer side of the disposable diaper 1. A plurality of sheets 32 and a plurality of sheets extending between the inner sheet 31 and the outer sheet 32 extending in the width direction of the crotch sheet member 2, that is, in the length direction of the back sheet member 4. The back side elastic member is provided.
In addition, this back side sheet member 4 and the said stomach side sheet member 3 are mutually joined in the junction part 5 of the both ends of the length direction of these back side sheet members 4 and the stomach side sheet member 3, and wear It is designed to adhere to the waist or abdomen of the person.

The inner surface side sheet 31 and the outer surface side sheet 32 in the back sheet member 4 are formed in the same shape and size from each other by a non-woven fabric having excellent air permeability. The inner surface side sheet 31 and the outer surface side sheet 32 are made of the same nonwoven fabric as the liquid permeable sheet 11 of the crotch sheet member 2 and the inner surface side sheet 26 and the outer surface side sheet 27 of the abdominal sheet member 3. Can be formed.
The plurality of back-side elastic members extend in a direction along the width direction of the crotch sheet member 2 and elastically expand and contract in the length direction. In this embodiment, the rubber formed in a thread shape Are used respectively. In addition, the adhesive agent is apply | coated to the outer peripheral surface of each back side elastic member, and each back side elastic member is mutually joined with the said inner surface side sheet | seat 31 and the outer surface side sheet | seat 32 with this adhesive agent.

By the way, this back seat member 4 is formed such that the length of the back seat member 4 in the width direction (vertical direction when worn (standing position)) is larger than the length in the width direction of the ventral seat member 3. It is configured so that it can be covered from around the wearer's waist to the buttocks when worn.
Specifically, the back sheet member 4 includes a base portion 8 that covers the waist of the wearer and is joined to the ventral sheet member 3, and the length of the crotch sheet member 3 beyond the base portion 8. It is the structure by which the collar part covering part 9 which is arrange | positioned in the position near the center part of a direction and which covers a wearer's collar part was formed integrally.
The base portion 8 is formed in a substantially rectangular shape that is substantially the same size and shape as the ventral sheet member 3, and a part of the plurality of backside elastic members is in the length direction of the backside sheet member 4. That is, the first elastic member 33 extending in the length direction of the base body 8 is provided. The first elastic members 33 are arranged at predetermined intervals in the width direction of the base portion 8, that is, in the vertical direction when worn (standing position), and the base portion 8 in the back side seat member 4. It is accommodated between the inner surface side sheet 31 and the outer surface side sheet 32 which are located in the range. In this embodiment, the same number of the first elastic members 33 are provided at the same intervals as the ventral elastic members 28 of the ventral sheet member 3.

The buttock covering portion 9 is an edge portion on the center side in the length direction of the crotch sheet member 2 in the width direction of the back sheet member 4 (vertical direction when worn (standing position)) (hereinafter simply referred to as a buttock covering). The lower end of the crotch sheet member 2 (the lower side when worn (standing position)). It is the structure protruded so that it may become convex toward.
In this embodiment, the central portion in the length direction of the back sheet member 4 in the edge portion 9a of the collar covering portion 9, that is, the center in the length direction of the protruding portion is formed. The portion is a linear portion extending substantially linearly in the same direction as the length direction of the flange covering portion 9. In addition, a portion other than the linear portion in the edge portion 9a of the flange covering portion 9 is a curved portion that is gently curved.

In the buttock covering portion 9, among the plurality of backside elastic members, the backside elastic member other than the first elastic member 33 disposed on the base portion 8 is the crotch portion in the buttock covering portion 9. The second elastic member 34 is disposed on the edge portion 9 a on the center side in the length direction of the sheet member 2.
The second elastic member 34 extends in the length direction of the back seat member 4 along the edge portion 9a on the center side in the length direction of the crotch seat member 2 in the buttock covering portion 9, and Elastically stretchable in the axial direction.
In addition, the second elastic member 34 is disposed along the edge portion 9a of the flange covering portion 9 as a whole, while both end portions are in the length direction of the base portion 8. It has a mode in which it has entered even a part of the region on the side of the flange covering portion 9 on both ends.
In this embodiment, three second elastic members 34 are provided, and these second elastic members 34 are arranged at a constant interval in the width direction of the base portion 8, that is, in the vertical direction when worn. Are arranged between the inner surface side sheet 31 and the outer surface side sheet 32 located in the range of the flange covering portion 9.

Here, as shown in FIGS. 3 and 7, the first elastic member 33 and the second elastic member 34 are respectively located on the end side in the length direction of the back seat member 4. A part on the end side in the axial direction is fixed to an inner surface side sheet 31 and an outer surface side sheet 32 forming the back side sheet member 4 in a state of crossing each other. That is, both end portions of the second elastic member 34 are in a state in which the portions that have entered the base portion intersect with a part of the first elastic member 33 disposed on the base portion 8. It has become.
In this way, the first elastic member 33 and the second elastic member 34 are partly arranged on the end sides in the axial direction of the back side seat member 4 on the end side in the length direction. This is because of the following reasons. That is, even if the absorber 13 becomes heavier due to absorbing and holding excretory fluid and the like, the first elastic member 33 and the second elastic member 34 cooperate to move the crotch sheet member upward. This is because the crotch sheet member 2 is pulled up to fit the wearer's wearing site.

In this embodiment, the end portions of the two first elastic members 33a and 33b located on the base portion 8 on the heel portion covering portion 9 side (the lower side of the base portion 8 when worn (standing)); Part of the three second elastic members 34 a to 34 c on the end side is fixed in a state of intersecting with each other at the joint 5.
Note that the first elastic member and the second elastic member intersect with each other at the joint portion only if the intersection between the first elastic member and the second elastic member is located at the joint portion. However, although the intersection of the first elastic member and the second elastic member is not located at the joint, the end portions in the axial direction of the first elastic member and the second elastic member, respectively. It also includes a state in which the state where a part of the sides cross each other is maintained and the closest joint portion is reached.

Here, as shown in FIG. 3, a part of the ventral elastic member 28 extends in the ventral length direction side of the pair of lengthwise extension portions 21 and 22 in the covering sheet 16. It arrange | positions so that the position corresponding to the protrusion part 21 may overlap.
Further, a part of the back side elastic member is disposed so as to overlap with a position corresponding to the lengthwise side extension 22 on the back side of the covering sheet 16. In this embodiment, among the back side elastic members, several of the plurality of first elastic members 33 disposed on the base portion 8 of the back side sheet member 4 are long on the back side. It arrange | positions so that it may overlap with the position corresponding to the length direction side extension part 22. FIG.
In this way, a part of the abdominal elastic member 23 or the back elastic member overlaps with the position corresponding to the abdominal length direction extension portion 21 or the back length direction extension portion 22. The reason for the arrangement is as follows.
That is, due to the elastic force of the abdominal elastic member 23 or the back elastic member, the abdominal length direction extension portion 21 or the back length direction extension portion 22 is moved in the width direction of the absorber 13. By contracting and as much as possible gathering the absorbent material 19 bonded to the inner peripheral surface side of these lengthwise side extending portions 21, 22, the lengthwise side extending portion 21 , 22 in order to improve the liquid absorption capacity as much as possible.
The abdominal side lengthwise extension portion 21 and the back side lengthwise extension portion 22 contract in the width direction of the absorber 13 by the elastic force of the abdominal side elastic member 28 and the back side elastic member ( And the density of the region where the absorbent material 19 is present increases in a plan view of the abdominal side lengthwise extension portion 21 and the back side lengthwise extension portion 22, Thereby, the liquid absorption capability in the pair of lengthwise side extending portions 21 and 22 can be increased.

And these liquid-impermeable sheets 12 and the ventral side in the liquid-impervious sheet 12 on both ends in the longitudinal direction of the crotch sheet member 2 and the ventral-side sheet member 3 and the back-side sheet member 4 The seat member 3 and the back side seat member 4 are joined to each other at a portion where they are overlapped and in contact with each other.
For joining the liquid-impermeable sheet 12 on both end sides in the length direction of the crotch sheet member 2 to the abdomen-side sheet member 3 and the back-side sheet member 4, a known joining means may be used. However, in this embodiment, they are bonded to each other by bonding with an adhesive.
Specifically, in this embodiment, in the liquid-impermeable sheet 12 of the crotch sheet member 2, the liquid-impermeable sheet 12, the ventral sheet member 3, and the back-side sheet member 4 abut. First adhesive portions 36 and 37 are respectively formed on both ends of the portion, that is, the liquid-impermeable sheet 12 in the length direction.
On the other hand, in the abdomen sheet member 3 and the back sheet member 4, second adhesive portions 38 and 39 are respectively formed on the portions of the liquid impervious sheet 12 that are in contact with both end portions in the length direction. ing.

As shown in FIG. 7, the first adhesive portions 36 and 37 are disposed on the center side in the width direction of the liquid-impermeable sheet 12 in the crotch sheet member 2. In addition, the first adhesive application region 40 is formed on the first adhesive portion 36 formed on the end side joined to the ventral sheet member 3, and the end portion joined to the ventral sheet member 3. A first adhesive application region 41 is provided in each of the first adhesive portions 37 formed on the side. In this embodiment, the first adhesive portions 36 and 37 are provided such that the first adhesive application regions 40 and 41 extend in the length direction of the crotch sheet member 2.
On the other hand, the second adhesive portions 38, 39 are the liquid-impermeable sheet 12 of the crotch sheet member 2 in the inner surface side sheet 26 of the ventral sheet member 3 and the inner surface side sheet 31 of the back side sheet member 4. More specifically, a position overlapping the first adhesive portions 36 and 37 provided on the liquid-impermeable sheet 12. Further, the second adhesive portion 38 provided on the ventral sheet member 3 is continuously provided in the width direction of the crotch sheet member 2, that is, in the length direction of the ventral sheet member 3. An extended second adhesive application region 43 is provided. The second adhesive portion 39 provided on the back sheet member 4 continuously extends in the width direction of the crotch sheet member 2, that is, in the length direction of the back sheet member 4. A second adhesive application region 44 is provided.
Any adhesive can be used as the adhesive applied to the first adhesive application areas 40 and 41 and the second adhesive application areas 43 and 44, but a hot melt adhesive is most preferable.

The crotch sheet member 2 (more specifically, the liquid-impermeable sheet 12) and the ventral sheet member 3, and the crotch sheet member 2 (more specifically, the liquid-impermeable sheet 12) and the back-side sheet. The member 4 intersects the first adhesive application regions 40 and 41 in the first adhesive portions 36 and 37 and the second adhesive application regions 43 and 44 in the second adhesive portions 38 and 39. In this state, they are joined to each other.
Therefore, the first adhesive is applied in a state where the adhesive applied to the first adhesive application areas 40 and 41 and the adhesive applied to the second adhesive application areas 43 and 44 also intersect each other. The adhesive application regions 40 and 41 are in contact with the second adhesive portions 38 and 39, and the second adhesive application regions 43 and 44 are in contact with the first adhesive portions 36 and 37, and are bonded to each other by the respective adhesives. The Rukoto.
As a result, the crotch sheet member 2 is pulled up by the first adhesive application regions 40 and 41 continuous in the length direction of the crotch sheet member 2 and held so as not to sag as much as possible. In the second adhesive application areas 43 and 44 intersecting with the first adhesive application areas 40 and 41, a downward tensile force acting on the first adhesive application areas 40 and 41 is applied to the crotch portion. It becomes possible to disperse in the width direction of the sheet member 2. As a result, even if the absorbent becomes heavy due to absorption and retention of the excretion fluid of the wearer, the first adhesive application areas 40 and 41 and the second adhesive application areas 43 and 44 cooperate. Thus, it is possible to suppress the crotch sheet member 2 from sagging and to maintain the pulled-up state stably.

Hereinafter, the manufacturing method which manufactures the disposable diaper which has the said structure using FIGS. 8-11 is demonstrated.
As a basic flow of the manufacturing method of the disposable diaper, the step S1 of forming a laminate for the crotch sheet member is performed, and a composite member for the abdomen seat member and a composite member for the back seat member are provided. Step S2 of forming is performed.
Thereafter, the step S3 of forming the crotch sheet member and the first adhesive portion from the laminate for the crotch sheet member, and the second member in the composite member for the abdominal sheet member and the composite member for the back sheet member The process S4 which forms the adhesion part, and the process S5 for joining the crotch sheet member, the composite member for the abdomen sheet member, and the composite member for the back sheet member are performed. Further, a step S6 is performed in which the composite member for the back side sheet member is cut (leg cut) in accordance with a predetermined shape of the buttock covering portion in the back side sheet member 4 of the disposable diaper 1.
Thereafter, as a finishing step, the step S7 of superposing the composite member for the abdominal sheet member and the composite member for the back side sheet member, and bonding the composite member of the abdominal side sheet member and the composite member of the back side sheet member to each other Then, the cutting step S8 is performed.

The step S1 for forming the laminate for the crotch sheet member will be described.
That is, this step S1 includes a step of forming a continuous body of the absorbent body, a liquid permeable sheet, a liquid impermeable sheet, the absorbent body, and a pair of leakage barriers constituting the crotch sheet member 2, respectively. And a stacking step of stacking.

In the step of forming the absorber continuum, the absorber continuum 67 is formed using an apparatus 60 as shown in FIG. In addition, the continuous body 67 of the absorbent body formed in this step is a plurality of absorbent bodies in a state in which a long nonwoven fabric 61 for a covering sheet serving as a covering sheet for the absorbent body is wound around the plurality of absorbent cores 5. Means a long series of lines before being cut into a single absorber 13.
The apparatus 60 is an application that applies an adhesive to the nonwoven fabric roll 62 wound with the long nonwoven fabric 61 for the covering sheet and the nonwoven fabric 61 for the covering sheet drawn out from the nonwoven fabric roll 62 onto the conveying line. The apparatus 63 and the suction drum 64 which shape | molds the said absorption core 15 and mounts the shape | molded absorption core 15 on the nonwoven fabric 61 for the said covering sheets are provided. Further, the folding device (sailor) 65 for folding the covering sheet non-woven fabric 61 on which the absorbent core 15 is placed, the covering sheet non-woven fabric 61 folded by the bending device 65 and the absorbing core 15 are absorbed. And a pressing device 66 for pressing in the thickness direction of the core 15.

And the formation of the said continuous body 67 of the said absorber is the said application | coating apparatus 63 on the upper surface of the nonwoven fabric 61 for coating sheets on the conveyance line, drawing the nonwoven fabric 61 for coating sheets on the conveyance line from the said nonwoven fabric roll 62. An application process for applying an adhesive is performed.
Furthermore, on the non-woven fabric 61 for the coating sheet whose adhesive was applied to the upper surface in the coating process, the mounting process of mounting the absorbent core 15 by the suction drum 64, and the absorbent core 15 was mounted after the mounting process. A folding step of bending the non-woven fabric 61 for the covering sheet by the bending device 65 is performed.
Then, the continuous body 67 of an absorber is formed by performing the press process which presses the nonwoven fabric 61 for coating sheets and the absorption core 15 which were bent in the bending process with the said pressing device 66 in the thickness direction of the said absorption core 15. The continuum 67 of the absorbent body is conveyed to the stacking step which is the next step.

In the coating step, as shown in FIG. 9A, the coating device 63 is used to cover the entire width (the length in the horizontal direction perpendicular to the transport direction) of the covering sheet nonwoven fabric 61 on the transport line. The adhesive such as a melt-type adhesive is applied. In this embodiment, the adhesive is continuously applied to the upper surface of the nonwoven fabric 61 for the covering sheet along the conveying direction of the nonwoven fabric 61 for the covering sheet.
In addition, the said coating device 63 can use the thing of arbitrary structures, if the said adhesive agent can be apply | coated over the full width of the width direction of the nonwoven fabric 61 for said coating sheets. For example, a plurality of nozzles capable of discharging an adhesive with a predetermined width are arranged in the width direction of the nonwoven fabric 61 for the covering sheet, and the entire width in the width direction of the nonwoven fabric 61 for the covering sheet is arranged by the plurality of nozzles. The thing of the structure which apply | coats an adhesive agent can be used.

In the placing step, the water absorbing material or the super absorbent material constituting the absorbent core 15 is provided on the outer peripheral surface of the suction drum 64 above the suction drum 64 while the suction drum 64 rotates. In addition, it is sucked and laminated in the concave mold 64a having a predetermined shape, thereby forming the absorbent core 15 in the mold 64a. As the suction drum 64 rotates, the absorption core 15 in the mold 64a moves to the lower side of the suction drum 64. When the suction core 64 faces the upper surface of the non-woven fabric 61 for the cover sheet, the suction drum By stopping suction of the absorbent core 15 by 64, the absorbent core 15 in the mold 64a is detached from the mold 64a, transferred onto the nonwoven fabric 61 for covering sheet, and placed.
The suction drum 64 may be a known one as long as it has a mold that matches the shape of the desired absorbent core on the outer peripheral surface. The arrow marked on the suction drum 64 in FIG. 8 indicates the suction direction.

Here, as shown in FIG. 9B, when the absorbent core 15 is placed on the upper surface of the nonwoven fabric 61 for the covering sheet, the water absorption that constitutes the absorbent core 15 due to impact or the like at the time of placement. A part of the absorbent material and the superabsorbent material is detached from the absorbent core 15 and falls on the nonwoven fabric 61 for the covering sheet. The dropped water-absorbing material and superabsorbent material are adhered to the nonwoven fabric 61 for the covering sheet by an adhesive on the upper surface of the nonwoven fabric 61 for the covering sheet.
These dropped water-absorbing materials and superabsorbent materials become part of the absorbent material 19 of the extending portions 18 and 18 and the lengthwise-side extending portions 21 and 22.
At this time, the water-absorbing material and the superabsorbent material dropped on the non-woven fabric 61 for the covering sheet are basically fixed to the entire width of the non-woven fabric 61 for the covering sheet and both end sides in the length direction of the absorbent core 15. It becomes the state which spreads over the range. However, the closer to the absorbent core 15, the larger the basis weight of the water-absorbing material or the superabsorbent material, and the basis weight tends to gradually decrease as the distance from the absorbent core 15 increases. Moreover, about the said extension parts 18 and 18, a water absorptive material and a superabsorbent material are easy to fall out from the surface of the both ends side of the width direction of the absorption core 14. FIG. Further, the surfaces on both end sides in the width direction of the absorbent core 14 have a larger area than the surfaces on both end sides in the length direction of the absorbent core 14, and the basis weight from which the water-absorbing material and the superabsorbent material fall out is relatively high. Therefore, the basis weight of the absorbent material 19 adhered to the inner peripheral surface side tends to be larger than that of the lengthwise side extending portions 21 and 22.

On the other hand, in the mounting step, as described above, the suction drum 64 rotates to move the absorption core 15 in the mold 64a to the lower side of the suction drum 64. Also, when the is rotated, a part of the water-absorbing material or the superabsorbent material constituting the absorbent core 15 falls out of the mold 64a of the suction drum 64.
At this time, the dropped water-absorbing material or superabsorbent material falls onto the upper surface of the non-woven fabric 61 for the covering sheet, and becomes the non-woven fabric 61 for the covering sheet by the adhesive on the upper surface of the non-woven fabric 61 for the covering sheet. Glued.
These dropped water-absorbing materials and superabsorbent materials also become part of the absorbent material 19 of the extending portions 18 and 18 and the lengthwise side extending portions 21 and 22.

At this time, as the suction drum 64 rotates, the water-absorbing material and the superabsorbent material that fall out of the absorption core 15 in the mold 64 a of the suction drum 64 are transferred to the mold 64 a by the rotation of the suction drum 64. It falls mainly between the position inclined about 90 degrees and the position facing the upper surface of the nonwoven fabric 61 for covering sheets. Therefore, on the upper surface of the nonwoven fabric 61 for the covering sheet on the transport line, there are many opportunities for the water absorbent material or the super absorbent material to fall downstream in the transport direction from the position where the absorbent core 15 is placed. Since the time during which the absorbent core 15 can be dropped is long, a large amount of water-absorbing material or superabsorbent material falls more downstream in the transport direction than the position where the absorbent core 15 is placed. On the contrary, on the upstream side in the transport direction from the position where the absorbent core 15 is placed, there are fewer opportunities for the water-absorbing material or the superabsorbent material to fall compared to the downstream side (the time during which the absorbent core 15 can fall is short). For this reason, the basis weight of the falling water-absorbing material or superabsorbent material is smaller than that on the downstream side. As a result, a state in which the basis weight of the absorbent material is large on one side in the length direction of the absorbent core 15 on the upper surface of the nonwoven fabric 61 for the covering sheet and the other side is small is formed.
Therefore, in step S3 of forming the crotch sheet member 2 and the first adhesive portions 36 and 37 from the later-described laminate 45 for crotch sheet member, which is a later step, the laminate 45 for crotch sheet member is formed. When one crotch sheet member 2 is cut and a pair of lengthwise extending portions are formed on the covering sheet 16, the one having the larger basis weight of the absorbent material adhered to the covering sheet 16 Let the length direction side extension part be the length direction side extension part 21 of the abdominal side located in the stomach side sheet member side. On the contrary, the lengthwise side extending portion 22 having the smaller basis weight of the absorbent material 19 is referred to as a lengthwise side extending portion 22 on the back side located on the backside sheet member side.
Thereby, as for the covering sheet 16 of the absorber 13, the length direction side extension part 21 of the abdominal side among the pair of length direction side extension parts is made of the absorbent material 19 bonded to the inner peripheral surface side. It becomes possible to set it as the structure whose basic weight is more than the length direction side extension part 22 of the back side.

In the bending step, the folding device 65 having various known configurations causes the covering sheet non-woven fabric 61 on which the absorbent core 15 is placed, the non-woven fabric 61 around the outer peripheral surface of the absorbent core 15 about the axis. Fold it so that it is wound into a frame. Specifically, as shown in FIG. 9 (c), the nonwoven fabric 61 for the covering sheet extends in the length direction of the absorbent core 15 at each corner 15 a of the maximum width portion W of the absorbent core 15. Bend along a straight line.
At this time, both end portions in the width direction of the non-woven fabric 61 for the covering sheet are overlapped with the center portion in the width direction of the absorbent core 15 on the upper surface side of the absorbent core 15, and the adhesive applied in the coating step is used. Adhere and connect to each other. Thereby, a portion corresponding to the overlapping portion 20 of the covering sheet 16 is formed.
Here, since the upper surface of the nonwoven fabric 61 for the covering sheet is in a state in which the water-absorbing material or the superabsorbent material is bonded over the entire width in the placing step, the width direction of the nonwoven fabric 61 for the covering sheet In the portion where the both end portions are overlapped, the absorbent material 19 is disposed between one end side and the other end side in the width direction of the nonwoven fabric 61 for the covering sheet.

On the other hand, leg portions 17 and 17 that are curved so as to protrude toward the center side in the width direction of the absorption core 15 are respectively formed on both ends in the width direction of the absorption core 15. Therefore, as shown in FIG. 9 (d), the extending portions 18 and 18 are formed in the leg portions 17 and 17 in the nonwoven fabric 61 for covering sheet.
That is, the non-woven fabric 61 for the covering sheet extends from the end portion in the width direction of the absorbent core 15 to the leg portions 17 and 17 in the state of being wound around the absorbent core 15 and has an inner peripheral surface. The extending portions 18 and 18 that are not in contact with the surface of the absorbent core 15 on the liquid-permeable sheet side and the surface of the liquid-impermeable sheet side are formed.
At this time, the absorbent material 19 which is a water-absorbing material or a superabsorbent material that has fallen off from the absorbent core 15 is adhered to the inner peripheral surface side of the extending portions 18 and 18.
Note that the water absorbent material and the super absorbent material in the absorbent core 15 may fall off even during the bending step, and even if the water absorbent material or super absorbent material that has already fallen off is covered, the coated sheet Some of them are not completely adhered to the nonwoven fabric 61 for use. Then, such a water-absorbing material and a superabsorbent material that have not been bonded to the nonwoven fabric 61 for the covering sheet are below the absorbent core 15 in the nonwoven fabric 61 for the covering sheet (liquid-impermeable sheet side). Since it tends to move to the bent portion, it is easy to adhere to that portion. Therefore, compared with the other part by the side of the inner peripheral surface of the extension parts 18 and 18, the bending part of the downward side of the said absorption core 15 has much basic weight of an absorptive material, and its absorption capacity is high. The bent portion on the lower side of the absorbent core 15 on the inner peripheral surface side of the extending portions 18, 18 is relatively easy to sweat when the disposable diaper 1 is worn, and the root of the leg on the wearer's inner crotch side. Since it hits the portion, it is possible to effectively absorb sweat by the absorbent material 19 adhered to the bent portion on the lower side of the absorbent core 15 and to keep the environment in the diaper 1 in a more stable and dry state. It becomes.

In the pressing step, the non-woven fabric 61 for the covering sheet is wound around the outer periphery of the absorbent core 15 in a frame shape around the axis in the bending step. Press in the thickness direction. Thereby, while stabilizing the shape of the said absorption core 15, the adhesion of the nonwoven fabric 61 for coating sheets and the absorption core 15, and the part which overlapped the both ends of the width direction of the nonwoven fabric 61 for said coating sheets are overlapped Mutual adhesion is more reliably performed.
The pressing device 66 may have any configuration, for example, a plurality of upper and lower pairs of pressing rolls are provided, and the covering sheet non-woven fabric 61 and the absorbent core are provided between the pair of pressing rolls. 15 can be used.

In the process of forming the series of absorbent bodies 67, a part of the water-absorbing material and the superabsorbent material is absorbed from the absorbent core 15 not only in the placing process and the bending process but also in the pressing process. There is a possibility of falling out.
Further, most of the dropped water-absorbing material and superabsorbent material are adhered to the nonwoven fabric 61 for the covering sheet, but a part of the water-absorbing material and the superabsorbent material can be moved without being completely adhered to the nonwoven fabric 61 for the covering sheet. Even such a thing functions as an absorptive material, and can absorb and hold when it comes into contact with liquids such as excretion fluid and sweat.

Then, after the step of forming the absorber continuous body 67, the stacking step is performed.
In the laminating step, a liquid-permeable sheet, a liquid-impermeable sheet, a continuous body 67 of the absorber, and a pair of leak-proof walls are laminated, and a laminate 45 for a long crotch sheet member that is long in the conveying direction. (However, the liquid-permeable sheet, the liquid-impermeable sheet, and the pair of leak-proof walls are long and long in the conveying direction). Thereafter, as shown in FIG. 11, the crotch sheet member laminate 45 is conveyed toward the next step S <b> 3 in which the crotch sheet member 2 and the first adhesive portions 36 and 37 are formed.
The laminate 45 for the crotch sheet member is in a state before the individual crotch sheet members 2 are formed, in which the plurality of crotch sheet members 2 are substantially continuous in the length direction, and the rear Individual crotch sheet members 2 are obtained by cutting into a predetermined length in the process.

Next, step S2 of forming a composite member for the abdominal sheet member and the back sheet member will be described.
As shown in FIG. 10, this step S2 is performed while conveying the nonwoven fabric 46 for a long outer surface sheet that forms the outer surface sheets 27 and 32 of the abdominal sheet member 3 and the back sheet member 4. A plurality of lengths on the nonwoven fabric 46 for the outer surface side, extending in the length direction of the nonwoven fabric 46 for the outer surface side sheet, and expanding and contracting in the length direction (axial direction) from a natural length to a predetermined magnification. The elastic members 47 to 49 having a scale are disposed at a predetermined interval.
The composite member 50 for the abdominal sheet member is the abdominal sheet member 3 in the disposable diaper 1 as a finished product, and the composite member 51 for the back side sheet member is the back side sheet member of the disposable diaper 1. 4 is formed.
Then, on the non-woven fabric 46 for the outer sheet on which the long elastic member 47 for the ventral sheet member and the elastic members 48 and 49 for the long dorsal sheet member are arranged, the ventral sheet member 3 is provided. And the elongate composite member 53 extended in a conveyance direction is formed by laminating | stacking the nonwoven fabric 52 for elongate inner surface side sheets which forms the inner surface side sheets 26 and 31 of the back side sheet member 4, respectively. The composite member 53 is a combination of the composite member 50 for the ventral seat member and the composite member 51 for the back seat member.

Here, about the elastic members 48 and 49 for the back side sheet member, for the first back side sheet member disposed at a position corresponding to the base portion 8 in the back side sheet member 4 in the disposable diaper 1. The elastic member 48 and the second elastic member 49 for the back-side sheet member disposed at a position corresponding to the buttock covering portion 9 are different in the disposition method for the nonwoven fabric 46 for the outer surface-side sheet.
That is, with respect to the first elastic member 48 for the back side seat member, the plurality of elongated belly side seat member elastic members 47 disposed at positions corresponding to the composite member 50 for the abdominal side seat member, At substantially the same intervals, the outer surface side non-woven fabric 46 is arranged in a substantially straight line.
On the other hand, the second elastic member 49 for the back side seat member is convex toward the shape of the predetermined edge portion 9a of the buttock covering portion 9, that is, the central side in the length direction of the crotch seat member. It arrange | positions on the nonwoven fabric 46 for said outer surface side sheets, curving according to the shape protruded so that it may become.
The first elastic member 48 for the back seat member is the first elastic member 33 among the back elastic members provided on the back seat member 4 in the disposable diaper 1 as a finished product, The second elastic member 49 for the back seat member is the second elastic member 34 among the back elastic members provided on the back seat member 4 in the disposable diaper 1.

Then, while conveying the long composite member 53 in the length direction, the composite member 53 is cut and divided into two by a cutter 55 at a predetermined position in the width direction of the composite member 53, The long compound member 50 for the abdomen sheet member and the long compound member 51 for the dorsal sheet member in a state before being divided into the individual abdomen sheet member 3 and the back sheet member 4. Respectively.
At this stage, the abdominal sheet member composite member 50 and the back sheet member composite member 51 include the abdomen sheet member 3 and the back sheet member 4 of the disposable diaper 1 as a finished product. It is a state in which a plurality are connected, and is divided into an individual belly side seat member 3 and a back side seat member 4 in a subsequent process. Further, the conveyance direction MD of the composite member 50 for the ventral sheet member and the composite member 51 for the back seat member is the length direction of each of the ventral sheet member 3 and the back seat member 4.
Then, while maintaining the state where the composite member 50 for the abdominal seat member and the composite member 51 for the back seat member are arranged at a certain distance from each other, the second bonding portion which is the next step is performed. It conveys toward process S4 to form.

After the step S1 of forming the crotch sheet member laminate, the step S3 of forming the crotch sheet member 2 and the first adhesive portions 36 and 37 from the crotch sheet member laminate 45 is performed. .
In this step S3, as shown in FIG. 10, various adhesives such as a hot-melt adhesive are applied to the liquid-impermeable sheet in the laminate 45 for the crotch sheet member that has been conveyed by the adhesive application device 56. By applying, the first adhesive portions 36 and 37 are formed.
In forming the first adhesive portions 36 and 37, the length of the crotch sheet member 2 in the longitudinal direction is determined with respect to the laminate 45 for the crotch sheet member. An adhesive is applied to the portions corresponding to both end portions of the liquid-impermeable sheet 12 in the crotch sheet member 2 and in contact with the abdomen-side sheet member 3 and the back-side sheet member 4. . When applying the adhesive, first adhesive application regions 40 and 41 that are continuous in the length direction of the liquid-impermeable sheet 12 in the crotch sheet member 2 are provided.
In this embodiment, the laminate 45 for the crotch sheet member is transported in a state where the liquid-impermeable sheet side is positioned on the upper surface for the convenience of manufacturing. It is applied from the upper side of the laminate 45 for the crotch sheet member.

Further, the laminate 45 for the crotch sheet member is later cut into individual crotch sheet members 2. In this embodiment, when the adhesive 41 is applied, the laminate 45 is applied to the conveyance direction MD. The position on the tail end side of the portion corresponding to the preceding crotch sheet member 2 and the tip side of the portion corresponding to the subsequent crotch sheet member 2 adjacent to the portion corresponding to the preceding crotch sheet member 2 The first adhesive portions 36 and 37 of the crotch sheet members 2 and 2 are formed simultaneously by applying the adhesive to the position.
Specifically, the adhesive is applied to the laminate 45 for the crotch sheet member in consideration of a predetermined length in the length direction of the crotch sheet member 2 and the adhesive 41 is applied at regular intervals. By applying, the first adhesive application region 41 over both the tail end side of the portion corresponding to the preceding crotch sheet member 2 and the position on the tip end side of the portion corresponding to the adjacent subsequent crotch sheet member 2. , 40, and the first adhesive portions 37, 36 (in the case of FIG. 9, the first adhesive portion 37 on the tail end side of the portion corresponding to the preceding crotch sheet member 2 and the subsequent crotch sheet member 2). The first adhesive portion 36) is simultaneously formed on the tip side of the portion corresponding to. In this embodiment, when the first adhesive portions 36 and 37 are formed, the first adhesive application regions 40 and 41 are arranged in the width direction of the laminate 45 for the crotch sheet member. In this state, a plurality of laminated bodies 45 for the crotch sheet member are formed in the length direction, that is, in the length direction of the portion corresponding to the crotch sheet member 2.

Then, after forming the first adhesive portions 36, 37, the laminate 45 for the crotch sheet member was sequentially cut to a predetermined length, and one absorbent core 15 was included. Individual crotch sheet members 2 are sequentially formed. At this time, the first adhesive portions 36 and 37 are formed on both end sides of the crotch sheet member 2, respectively.
Further, when the laminate 45 for the crotch sheet member is cut, the covering sheet nonwoven fabric 61 in a state in which the outer peripheral surface of the absorbent core 15 is wound is removed from both ends in the length direction of the absorbent core 15. The absorbent core 15 is cut at a certain length in the length direction. As a result, the pair of lengthwise side extending portions 21 and 22 are formed on the covering sheet 16. Here, on the inner peripheral surface side of these lengthwise side extending portions 21 and 22, the water-absorbing material or the The absorbent material 19 which is an absorbent material has already been adhered by an adhesive.
In this embodiment, the non-woven fabric 61 for the covering sheet is cut so as to have substantially the same length as the length direction of the crotch sheet member 2, and the pair of lengthwise side extensions. Among the portions, the side on which the absorptive material is adhered to the inner peripheral surface side is the abdominal lengthwise extension portion 21, and the other is the back lengthwise extension portion 22.

On the other hand, the composite member 50 for the ventral sheet member and the composite member 51 for the back seat member are formed after the step S2 of forming the composite members 50 and 51 for the ventral sheet member and the back seat member. Step S4 for forming the second adhesive portions 38 and 39 is performed.
As shown in FIG. 10, this step S4 is performed on the upper surface side of the composite member 50 for the ventral sheet member and the composite member 51 for the back sheet member that has been conveyed, that is, the nonwoven fabric 52 for the inner surface sheet. The second adhesive portions 38 and 39 are formed by applying various adhesives such as hot-melt adhesives with the adhesive applicators 57 and 58.
In forming the second adhesive portions 38 and 39, the individual abdominal sheet member 3 and the back sheet member are separated from the composite member 50 for the abdominal sheet member and the composite member 51 for the back sheet member. 4, an adhesive is applied to a position corresponding to a portion that comes into contact with the crotch sheet member 2 in an overlapping state. At this time, when applying the adhesive, the second adhesive continuous in the length direction (that is, the conveying direction) of the composite member 50 for the abdomen sheet member and the composite member 51 for the back sheet member. Application regions 43 and 44 are provided, respectively.

Furthermore, after the step S4 is completed, a step S5 of joining the crotch sheet member, the composite member for the abdomen seat member, and the composite member for the back seat member is performed.
As shown in FIG. 10, this step S5 is performed on the abdominal sheet member composite member 50 and the back sheet member composite member 51 on which the second adhesive portions 38 and 39 are formed, respectively. The both ends of the liquid-impermeable sheet 12 in the crotch sheet member 2 on which the first adhesive portions 36 and 37 are formed are brought into contact with each other, and the first adhesive portions 36 and 37 and the second adhesive portions are contacted. 38 and 39 are brought into close contact with each other.
Thereby, the 1st adhesive application area | regions 40 and 41 in the said 1st adhesion parts 36 and 37 and the 2nd adhesive application area | regions 43 and 44 in the said 2nd adhesion parts 38 and 39 crossed. Thus, the liquid-impermeable sheet 12 of the crotch sheet member 2, the composite member 50 for the abdomen sheet member, and the composite member 51 for the back sheet member are joined to each other.

At this time, the composite member 50 for the abdominal sheet member and the composite member 51 for the back side sheet member are conveyed in a state where a certain distance is maintained, and the crotch sheet member 2 has its length. The direction is along the seat surface of the composite member 50 for the abdomen seat member and the composite member 51 for the back seat member, and in a direction substantially orthogonal to the length direction of both the composite members 50 and 51. Set up.
As a result, the first adhesive application areas 40 and 41 and the second adhesive application areas 43 and 44 are in close contact with each other, and the adhesives of these first adhesive application areas 40 and 41 The adhesives in the second adhesive application areas 43 and 44 are integrated and joined to each other.
In this embodiment, the crotch sheet member 2 is conveyed with the liquid-impermeable sheet 12 on which the first adhesive portions 36 and 37 are formed positioned on the upper surface side. The crotch sheet member 2 needs to be brought into contact with the composite member 50 for the abdomen-side sheet member and the composite member 51 for the back-side sheet member after being turned upside down.

After the step S5 is completed, a step S6 of cutting the composite member for the back sheet member in accordance with a predetermined shape of the buttock covering portion is performed.
As shown in FIG. 10, this step S6 is performed on the shape of a predetermined edge portion 9a of the buttock covering portion 9 in the disposable diaper 1 as a product, that is, on the central side in the length direction of the crotch sheet member 2. A portion corresponding to the edge portion 9a of the buttock covering portion 9 in the composite member 51 for the back seat member is cut (legs cut) so as to conform to the shape projected so as to be convex.
In addition, the cut in this process S6 is performed so that the said 2nd elastic member 49 for back | dorsal sheet | seat members arrange | positioned in the said process S1 may be followed.

  Thereafter, in the step S7 of overlapping the composite member for the abdominal sheet member and the composite member for the back sheet member, as shown in FIG. The abdomen sheet member composite member 50 and the back sheet member composite member 51 joined to the member 2 are overlapped with each other.

And after completion | finish of the said process S7, the process S8 which adhere | attaches and cut | disconnects the composite member for a stomach side sheet member and the composite member for a back side sheet member mutually is implemented.
In this step S8, as shown in FIG. 10, the abdomen sheet member 3 and the dorsal sheet member, which are preliminarily determined, are combined with the compound member 50 for the abdomen sheet member and the compound member 51 for the dorsal sheet member. In order to adapt to the length in the length direction of 4, bonding is performed at a constant width by any means such as heat sealing or fusion by ultrasonic sealing, with a certain interval. Thereby, the both ends of the length direction of the abdominal sheet member 3 and the back | dorsal sheet member 4 are joined mutually. In addition, a part of this joined part becomes the junction part 5 of each disposable diaper 1 as a finished product. At this time, a part of the portion where the first back-side seat member elastic member 48 and the second back-side seat member elastic member 49 intersect is a joint between the ventral-side seat member 3 and the back-side seat member 4. It is preferable that it is located in the part and its vicinity.
Thereafter, the joined portions of the composite member 50 for the abdominal sheet member and the composite member 51 for the back seat member are joined so as to become individual disposable diapers 1 so that the joint portions 5 and 5 are joined. By forming, the pants-type disposable diaper 1 will be completed.

As described above, according to the disposable diaper 1 having the above-described configuration, the covering sheet 16 wound around the longitudinal axis of the absorbent core 15 on the outer peripheral surface of the absorbent core 15 has the width of the absorbent core 15. Extending portions 18, 18 extending from the end in the direction and having an inner peripheral surface side that is not in contact with the liquid-permeable sheet-side surface and the liquid-impermeable sheet-side surface of the absorbent core 15. doing.
Therefore, when the absorption core 15 expands due to the absorption of liquid such as excretory fluid, the extension portions 18 and 18 serve as expansion allowances for the absorption core 15, so that the expansion of the absorption core 15 is not hindered. As a result, the absorbent core 15 can sufficiently exhibit its original absorption power.

Further, the extending portions 18, 18 have an absorbent material 19 bonded to the inner peripheral surface side. Therefore, even if the liquid once absorbed from the absorbent core 15 oozes out into the extending portions 18, 18, the absorbent material absorbs the liquid again, while the sweat of the wearer of the disposable diaper 1 is absorbed. Even if it adheres to the extension parts 18, 18, the absorbent material 19 absorbs it.
Thereby, it becomes possible to suppress stably the liquid leakage of the excrement liquid etc. of the said disposable diaper 1, and the stuffiness at the time of wear.
As a result, the disposable diaper 1 can simultaneously ensure both a stable absorbability when worn and a good feeling of use due to prevention of liquid leakage and dampness.

In the above-described embodiment, the absorbent core 15 includes leg portions 17 and 17 that are curved so as to protrude toward the center side in the width direction of the absorbent core 15 at both ends in the width direction. The covering sheet 16 is wound around the absorbent core 15 so as to extend from the leg portions 17, 17 outward in the width direction of the absorber 13, and the leg hole in the covering sheet The portions extending from the portions are the extending portions 18 and 18.
However, the absorbent core does not necessarily have a leg portion. Even in the case where there is no leg hole, the covering sheet extends from the end of the absorbent core in the width direction, and the inner peripheral surface is the surface of the absorbent core on the liquid-permeable sheet side and What is necessary is just to provide the extension part which is mutually non-contact with the surface at the side of the said liquid-impermeable sheet.

In the embodiment, the disposable diaper 1 as an absorbent article can stand up on the surface of the liquid permeable sheet opposite to the absorbent body, and a pair of the diapers 1 extending in the length direction of the absorbent body. However, it is not always necessary to provide these leakage barriers.
Further, even when the pair of leak-proof walls is provided, the pair of leak-proof walls is most at the leg underside of the absorber (absorbing core 15) as in the embodiment. It is not necessary to be able to stand up with the position corresponding to the portion located on the center side in the width direction of the absorbent body as the base end part, and if the leak of the excrement of the wearer can be prevented, the base end part at the time of rising The position of can be arbitrarily set.

In the embodiment, the absorbent material 19 is bonded to the entire inner peripheral surface side of the extending portions 18 and 18. However, the absorbent material does not necessarily have to be adhered to the entire inner peripheral surface side of the extending portion, and a part of the inner peripheral surface side of the extending portion, for example, the liquid-impermeable sheet side in the absorbent core The absorbent material may be bonded only at the position or only at the position on the liquid permeable sheet side.
Further, even when the absorbent material is bonded to the entire inner peripheral surface side of the extension portion, the absorbent material is bonded substantially uniformly to the entire inner peripheral surface side of the extension portion. Or may be bonded in a state of being biased to a part of the inner peripheral surface side of the extending portion.

  In the embodiment, the covering sheet 16 is wound around the absorbent core 15 in a frame shape. However, the winding of the covering sheet around the absorbent core is performed on the outer peripheral surface of the absorbent core. As long as it is wound around the longitudinal axis of the absorbent core and the extension portion is formed, any winding method can be employed. Further, even when the covering sheet is wound around the absorbent core in a frame shape, it is not necessary to bend at each corner of the maximum width portion of the absorbent core as in the embodiment, and the extension If it is a position where a part is formed, you may bend along the straight line extended in the length direction of an absorption core in arbitrary positions.

Moreover, in the said embodiment, the said extension parts 18 and 18 become a mode in which the space was formed in the inner peripheral surface side, and it deform | transforms with a standup of the said pair of leak-proof walls 14 and 14. It has become a thing.
However, the extending portion extends from the end portion in the width direction of the absorbent core, and the inner peripheral surface side is mutually opposite to the surface on the liquid permeable sheet side and the surface on the liquid impermeable sheet side of the absorbent core. If it is non-contact, for example, as shown in FIG. 12, the space on the inner peripheral surface side of the extending portion 18 ′ is crushed in the normal state, and the inner peripheral surfaces of the extending portion 18 ′ are bonded to each other. There may be.
The configuration of the absorbent body in FIG. 12 is basically the same as that of the above-described embodiment except that the shape of the extending portion is different, and the same reference numerals are given to achieve the same operational effects. Detailed description will be omitted.

In the embodiment, the covering sheet 16 has overlapping portions 20 that are connected to each other by an adhesive in a state where both end portions in the direction wound around the absorbent core 15 are overlapped, and the overlapping The portion 20 is fixed to the liquid permeable sheet side in the absorbent core, but the overlapping portion may be disposed on the liquid impermeable sheet side.
Moreover, in the said embodiment, the said absorptive material 19 is arrange | positioned between the one end side of the direction wound around the said absorption core 15 in the said covering sheet 16 which comprises the said overlap part 20, and the other end side. However, it is not always necessary to dispose an absorbent material between one end side and the other end side of the covering sheet 16 in the overlapping portion in the direction wound around the absorbent core 15.

In the embodiment, the covering sheet 16 has a pair of lengthwise side extending portions 21 and 22 extending from both ends in the lengthwise direction of the absorbent core 15, and each length. An absorbent material 19 having liquid absorbency is bonded to the inner peripheral surface side of the direction side extending portions 21 and 22 with an adhesive.
However, the covering sheet does not necessarily have a pair of lengthwise side extending portions, or the lengthwise side extending portion is provided only at one end side in the lengthwise direction of the absorbent core. May be.
Moreover, even if the said covering sheet has a length direction side extension part in the one end side or both ends side of the length direction of the said absorption core, the inner periphery of the length direction side extension part The absorbent material may not be adhered to the surface side.

In the embodiment, a part of the ventral elastic member 28 and a part of the back elastic member (in this case, a part of the first elastic member 33) are the pair in the covering sheet 16. Are disposed so as to overlap the positions corresponding to the latest length direction side extension portions 21 and 22.
However, the ventral elastic member and the dorsal elastic member are such that at least one of the ventral elastic member and the dorsal elastic member is the pair of long portions in the covering sheet. What is necessary is just to be arrange | positioned so that it may overlap in the position corresponding to the nearest length direction side extension part among the length direction side extension parts. Alternatively, both the ventral elastic member and the dorsal elastic member may not overlap the position corresponding to the nearest lengthwise side extension.

In the embodiment, of the pair of lengthwise side extending portions 21, 22, the lengthwise abdominal side direction extending portion 21 located on the ventral sheet member 3 side has an inner peripheral surface. The basis weight of the absorbent material 19 bonded to the side is larger than the lengthwise side extending portion 22 on the back side located on the back side sheet member side.
However, the basis weight of the absorbent material bonded to each inner peripheral surface of the pair of lengthwise side extending portions can be arbitrarily set, even if the basis weight is the same, You may increase the length direction side extension part of the back side more than the length direction side extension part of the ventral side.

In the embodiment, the first adhesive portions 36 and 37 are provided on both ends of the crotch sheet member 2 in the length direction, and the second adhesive portions 38 and 39 are provided on the ventral side. The seat member 3 and the back seat member 4 are provided.
However, when the crotch sheet member, the abdominal sheet member, and the back sheet member are bonded with respect to the arrangement positions of the first bonding section and the second bonding section, the first bonding section and the second bonding section are disposed. Can be arbitrarily set to the crotch sheet member, the ventral sheet member, and the dorsal sheet member. That is, either the crotch sheet member or the back sheet member is provided with the first adhesive part on one side of the crotch sheet member and the ventral sheet member and the second adhesive part on the other side. The first adhesive portion may be provided on one side and the second adhesive portion may be provided on the other side.
Alternatively, the crotch sheet member and the abdominal sheet member and the back sheet member can be bonded by any method without using the first bonding section and the second bonding section as in the above embodiment. Or you may adhere | attach by the adhesion | attachment method which used the 1st adhesion part and the 2nd adhesion part for a part.
As described above, known joining means other than adhesion using an adhesive can be used for joining the crotch sheet member, the abdominal sheet member, and the back sheet member.

  In the said embodiment, although the example of the disposable diaper is shown as an absorptive material, as an absorptive article of the present invention, other than a disposable diaper may be used, for example, a sanitary napkin and an incontinence pad besides this Etc.

DESCRIPTION OF SYMBOLS 1 Disposable diaper 2 Crotch part sheet | seat member 3 Abdominal sheet | seat member 4 Back | dorsal sheet | seat member 11 Liquid permeable sheet 12 Liquid impervious sheet 13 Absorber 14 Leak-proof wall 15 Absorption core 16 Cover sheet 17 Leg part 18, 18 ' Extension part 19 Absorbent material 20 Overlapping part 21, 22 Lengthwise extension part 28 Abdominal elastic member 33 First elastic member (back elastic member)
34 Second elastic member (back elastic member)
W The maximum width of the absorption core

Claims (9)

A liquid-permeable sheet, a liquid-impermeable sheet disposed on one side of the liquid-permeable sheet, and a long one-way disposed between the liquid-permeable sheet and the liquid-impermeable sheet An absorbent article comprising an absorber,
The absorbent body has an absorbent core that absorbs and retains a liquid that extends in the length direction of the absorbent body, and a liquid permeability that is wound around an axis in the longitudinal direction of the absorbent core on the outer peripheral surface of the absorbent core. And a covering sheet having
The covering sheet extends from the end of the absorbent core in the width direction, and the inner peripheral surface side is not in contact with the liquid-permeable sheet-side surface and the liquid-impermeable sheet-side surface of the absorbent core. An absorbent article having an extension part, wherein an absorbent material having liquid absorbency is adhered to the inner peripheral surface side of the extension part with an adhesive.   The absorbent core is provided with leg portions that are curved so as to protrude toward the center side in the width direction of the absorbent core at both ends in the width direction, and the covering sheet extends from the leg portions. The coil is wound around the absorbent core in a state of extending outward in the width direction of the absorbent body, and a portion of the covering sheet that extends from the leg portion is the extended portion. 2. The absorbent article according to 1.   The absorbent article includes a pair of leak-proof walls extending in the length direction of the absorbent body, which can rise up on the surface of the liquid-permeable sheet opposite to the absorbent body. The pair of leak-proof walls according to claim 2, wherein the pair of leak-proof walls can rise with a position corresponding to a portion located closest to a center side in a width direction of the absorber in a leg portion of the absorber as a base end portion. Sex goods.   The absorptive article according to any one of claims 1 to 3 in which said absorptive material is pasted up to the whole inner peripheral surface side of said extension part.   The absorbent article according to any one of claims 1 to 4, wherein the cover sheet is wound around the absorbent core in a framed form.   The covering sheet has an overlapping portion interconnected by an adhesive in a state where both end portions in a direction wound around the absorbing core are overlapped, and the overlapping portion is the liquid-permeable portion in the absorbing core. The absorbent material is disposed between the one end side and the other end side of the covering sheet in a direction wound around the absorbent core, and is fixed to the absorbent sheet side. Item 6. The absorbent article according to any one of Items 1 to 5.   The covering sheet has a pair of lengthwise side extending portions extending from both end portions in the lengthwise direction of the absorbent core, and on the inner peripheral surface side of each lengthwise side extending portion, The absorbent article according to any one of claims 1 to 6, wherein the absorbent material having liquid absorbency is adhered by an adhesive. The absorbent article has the absorbent body and has a crotch sheet member that is long in one direction covering the crotch of the wearer, and the abdomen of the wearer that is joined to one end side in the length direction of the crotch sheet member. A disposable diaper comprising a ventral sheet member covering the side and a back sheet member covering the back side of the wearer, joined to the other end side in the length direction of the crotch sheet member;
The ventral sheet member has a plurality of ventral elastic members extending in a direction orthogonal to the length direction of the crotch sheet member and extending along the seat surface of the ventral sheet member, and the back seat The member has a plurality of back side elastic members extending in a direction perpendicular to the length direction of the crotch sheet member and along the seat surface of the back side sheet member,
At least one of the part of the belly side elastic member and the part of the back side elastic member is the nearest length direction side extension of the pair of length direction side extension parts of the covering sheet. The absorbent article of Claim 7 arrange | positioned so that it may overlap in the position corresponding to a part.   Among the pair of lengthwise side extending portions, the lengthwise side extending portion located on the abdominal sheet member side has a basis weight of the absorbent material bonded to the inner peripheral surface side. The absorptive article according to claim 8 which is more than the length direction side extension part located in the sheet member side.

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