JP5980262B2 - Disposable diapers - Google Patents

Description

  The present invention relates to a disposable diaper, and more particularly, to a disposable diaper capable of improving strength without impairing the feeling of use at the time of wearing.

As a disposable diaper that absorbs excreted fluid such as urine, a so-called three-piece type is widely known.
This three-piece disposable diaper generally has a crotch sheet member that is long in one direction covering the crotch of the wearer, and one end side in the length direction of the crotch sheet member. And a backside sheet member that covers the back side of the wearer and is connected to the other end side in the length direction of the crotch sheet member. The crotch sheet member, the abdominal sheet member, and the back sheet member are usually joined to each other by an adhesive at the overlapping portion.

By the way, such a three-piece type disposable diaper is roughly classified into two types depending on the structure of the crotch sheet member.
First, as shown in Patent Document 1, for example, a liquid-permeable sheet (so-called top sheet), a liquid-impermeable sheet (so-called back sheet) disposed on one side of the liquid-permeable sheet, and these There is a so-called complete three-piece type having a basic configuration of an absorbent body disposed between a liquid-permeable sheet and a liquid-impermeable sheet. In this complete three-piece type, the liquid impervious sheet is directly placed on the ventral side of the crotch sheet member where the both end sides of the crotch sheet member are overlapped with the ventral sheet member and the dorsal sheet member. It is joined to the seat member and the back seat member.
Second, as shown in Patent Document 2, in addition to the liquid-permeable sheet, the liquid-impermeable sheet, and the absorber, the liquid-impermeable sheet is made of a non-woven fabric on the surface opposite to the liquid-permeable sheet. There is also a so-called incomplete three-piece type in which an auxiliary sheet is provided. The incomplete three-piece type is different from the complete three-piece type in that the auxiliary seat is stretched between the abdominal seat member and the back seat member, and the crotch seat member The auxiliary sheet is configured to be joined to the ventral sheet member and the dorsal sheet member in the portion where the both end sides are overlapped with the ventral sheet member and the dorsal sheet member, respectively.

Moreover, in the disposable diaper, in order to make it easier to move the leg when worn, a leg cut that cuts the edge portion of the leg opening that inserts the wearer's leg into a predetermined shape may be performed. The complete three-piece type and the incomplete three-piece type subjected to such leg cuts are different in their manufacturing methods due to the difference in configuration.
That is, in the case of the complete three-piece type, the crotch sheet member is conveyed with respect to the long sheet forming the ventral sheet member and the long sheet forming the back sheet member, which are conveyed substantially in parallel. Are directly joined in a direction orthogonal to the conveying direction of the sheets forming the ventral sheet member and the back sheet member, and then the leg cuts are applied to the dorsal sheet member and the like.
On the other hand, in the case of the incomplete three-piece type, in the manufacturing process, a long sheet that forms a ventral sheet member and a long sheet that forms a back sheet member that are conveyed substantially in parallel with a constant interval. The auxiliary sheet is joined to the other sheet so as to span between the sheet forming the ventral sheet member and the back sheet member at a predetermined interval. Then, after attaching the absorber, the liquid-permeable sheet, and the liquid-impermeable sheet on the auxiliary sheet, the leg-cut is performed on the back sheet member and the like. At this time, in the case of the incomplete three-piece type, even if the abdomen sheet member and the back sheet member are pulled in the conveyance direction and the direction orthogonal to the conveyance direction, the auxiliary sheet attached in advance keeps the gap between these sheets. In order to contribute to the maintenance, the leg cut is relatively easy to perform.

However, in the case of the incomplete three-piece type, the size in the width direction of the auxiliary sheet is basically larger than the size in the width direction of each of the absorber, liquid permeable sheet, and liquid impermeable sheet. Since it is formed, a part of both ends in the width direction of the auxiliary sheet is in a state of protruding from the leg opening that allows the wearer's leg to pass in the disposable diaper.
Then, since a part of both ends in the width direction of the auxiliary sheet that protrudes from the leg opening is like a frill, the leg is caught when the wearer passes the leg through the leg opening, It may be difficult to wear a disposable diaper by preventing the wearer's leg from being inserted into the leg opening by causing friction more than necessary between the skin and the like. In particular, in the case of an elderly person, it is difficult to lift the leg and the posture tends to become unstable, and thus it may be difficult to pass the leg while avoiding the frill-shaped auxiliary sheet.

On the other hand, in the case of the complete three-piece type, there is no auxiliary sheet that spans between the abdominal seat member and the back seat member as in the incomplete three-piece type. No frills are formed in the opening. Therefore, compared with the incomplete three-piece type, it is easier for the wearer to pass the leg through the leg opening and to wear it.
However, the crotch sheet member tends to hang down as much as there is no auxiliary sheet such as the incomplete three-piece type. Therefore, if no measures are taken, when the absorbent body absorbs and retains excretory fluid such as urine of the wearer and becomes heavy, the crotch sheet member as a whole by the weight of the absorbent body, It may hang down from the abdominal seat member or the back seat member and may not fit in the crotch of the wearer or may become difficult to walk, which may impair the feeling of use.
In addition, when worn, friction occurs between the wearer's leg and the edge of the leg opening, regardless of whether it is a complete 3 piece type or an incomplete 3 piece type. As a result of this friction, the entire crotch sheet member remains on the thigh and cannot be completely pulled up, making it difficult to fit the wearer's crotch, and the feeling of use may still be impaired.

JP 2005-87622 A JP 2008-194161 A

  The technical problem of the present invention is a disposable diaper that can be worn stably without impairing the wearer's feeling of use even when the crotch sheet member is pulled downward when worn or when excrement is absorbed or held. Is to provide.

  In order to solve the above problems, the disposable diaper of 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. A crotch sheet member long in one direction covering the crotch of the wearer having an absorbent body disposed between the crotch sheet, and the crotch sheet member on one end side in the length direction of the crotch sheet member; An abdomen sheet member that covers the abdomen side of the wearer and is joined to the liquid-impermeable sheet in a superimposed state and is formed long in a direction orthogonal to the length direction of the crotch sheet member; The sheet member is joined to the liquid-impermeable sheet in a state of being overlapped with the crotch sheet member on the other end side in the length direction of the sheet member, and is formed to be long in a direction perpendicular to the length direction of the crotch sheet member. The wearer as a separate member from the ventral sheet member A dorsal sheet member covering the dorsal side, and the ventral sheet member and the dorsal sheet member are joined to each other at both end portions in the length direction of the ventral sheet member and the dorsal sheet member. In the disposable diaper, the back sheet member is joined to the abdomen sheet member and covers a base part covering the waist of the wearer, and closer to the crotch sheet member than the base part. A wearer that is disposed and has an end on the crotch sheet member side in the width direction of the back side sheet member protruding so as to protrude toward the center in the length direction of the crotch sheet member The base part and at least a part of the base part and the crotch sheet member are joined to each other, and the base part is formed of the back sheet member. It extends in the length direction and is elastic in the axial direction And at least one first elastic member that can be expanded and contracted, and the buttock covering portion is formed on the edge portion of the heel portion covering portion at the center side in the longitudinal direction of the crotch sheet member. And at least one second elastic member that is elastically stretchable in the axial direction, and the first elastic member and the second elastic member are the back seat member. A part of each axial end portion located on the end side in the length direction is fixed in a state of crossing each other.

  In the present invention, the crotch sheet member is formed such that the absorbent body is formed longer in the direction along the length direction of the crotch sheet member, and the crotch sheet member is crotch than the positions of both end portions in the width direction of the absorbent body. A pair of leak-proof walls positioned on the outer side in the width direction of the part seat member and extending in the length direction of the crotch seat member, and the pair of leak-proof walls and the back seat member It is preferable that the portion where the second elastic member is disposed in the collar cover portion is not joined to each other.

  Further, in the present invention, the crotch sheet member has non-joining regions that are not joined to the back side sheet member in the portion overlapped with the back side sheet member on both ends in the width direction. Can be.

  Further, in the present invention, the non-joint region of the crotch sheet member is such that the inner side in the width direction of the crotch sheet member in the non-joint region is wider than the widthwise ends of the absorber. It may extend to a portion corresponding to a position that enters the inside of the direction.

  In the present invention, the buttock covering portion of the back seat member is a discontinuous portion where the second elastic member is discontinuous in a part of the crotch seat member where the absorber is located. It can have.

  Further, in the present invention, the second elastic member is a portion that is not joined to the crotch sheet member rather than a portion that is joined to the crotch sheet member in the buttock covering portion of the back sheet member. In a contracted state, it is fixed to the edge portion on the center side in the length direction of the crotch sheet member in the buttock covering portion.

  Furthermore, in the present invention, the first elastic member and the second elastic member are fixed in a state in which a part of each axial end portion intersects each other at the joint portion. Preferably.

According to the present invention, in the complete three-piece type disposable diaper, the first elastic member of the base portion of the back sheet member and the second elastic member provided along the edge portion of the buttock covering portion are A part of each axial end portion located on the end portion side in the length direction of the back side seat member is fixed in a state of crossing each other.
Therefore, when the waist part of the disposable diaper is pushed and expanded when worn, and the back sheet member is pulled in the length direction of the back sheet member, the first elastic member is pulled in the length direction. Since the second elastic member intersecting with the first elastic member is pulled up, the collar covering portion is pulled up. As a result, the crotch sheet member joined to the buttock covering part is pulled up, so that the crotch sheet member is easily fitted to the wearer.

Moreover, even if the crotch sheet member is pulled downward by absorption and holding of excrement by the absorbent body, the second elastic member pulls the crotch sheet member upward through the buttock covering portion. In addition, since the first elastic member intersecting with the second elastic member disperses the force acting on the second elastic member in the axial direction of the first elastic member, the second elastic member The burden on the member can be reduced, and the crotch sheet member can be pulled up more stably.
Therefore, since the state in which the crotch sheet member is fitted to the wearer can be stably maintained, the feeling of use at the time of wearing can be kept good.

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 rear view schematically showing one embodiment of the disposable diaper according to the present invention. FIG. 4 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. 5 is a diagram schematically showing a state in which the disposable diaper of FIG. 1 is expanded as seen from a direction different from FIG. However, the state seen from the liquid-permeable sheet side of the crotch sheet member is shown. FIG. 6 is a schematic enlarged cross-sectional view of a main part of the disposable diaper of FIG. 1 cut by a crotch sheet member. FIG. 7 is a diagram schematically showing a state in which the first elastic member and the second elastic member in the back seat member intersect each other. FIG. 8 schematically shows (a) a state where the second adhesive portion is formed on the ventral sheet member and the back side sheet member, and (b) a state where the first adhesive portion is formed on the crotch sheet member. FIG. FIG. 9 is a diagram for explaining a process for producing a disposable diaper according to the present invention. FIG. 10 is a rear view schematically showing another embodiment of the disposable diaper according to the present invention.

FIGS. 1-8 shows one Embodiment of the disposable diaper of this invention, and the disposable diaper 1 of this embodiment is mainly three each covering a wearer's belly side, back side, and crotch part, respectively. This is a so-called three-piece type made of a substantially rectangular sheet member.
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 is overlapped with 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. The crotch sheet member 2 and the ventral sheet member 3, and the crotch sheet member 2 and the back sheet member 4 are joined to each other by an adhesive at the portion where they are overlapped.

As shown in FIGS. 1 and 2, the disposable diaper 1 includes a ventral sheet member 3 and a dorsal sheet member 4 in the length direction of the ventral sheet member 3 and the dorsal sheet member 4. In the joint portions 5 and 5 formed at both ends of each of the two, a so-called underpants type is obtained that is joined to each other by various means such as heat sealing or fusion by ultrasonic sealing.
The disposable diaper 1 has a waist opening 1b formed by the ventral sheet member 3 and the dorsal seat member 4 on the upper side when worn (standing position), 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 has a liquid-permeable liquid-permeable sheet 11 (so-called top sheet) that is located on the skin surface side of the wearer and extends in the length direction of the crotch sheet member 2, and the wearer. And a liquid-impermeable sheet 12 (so-called back sheet) having liquid-impermeable properties, which is located on the opposite side to the skin surface side and extends in the length direction of the crotch sheet member 2.
Furthermore, the length of the crotch sheet member 2 that is disposed between the liquid-permeable sheet 11 and the liquid-impermeable sheet 12 and absorbs and holds excretion liquid such as urine excreted from the wearer. An absorbent body 13 extending in the lengthwise direction and a pair of leak-proof walls 14 extending in the lengthwise direction of the crotch sheet member 2 along the absorbent body 13 are provided.
And in each part where the said crotch sheet | seat member 2, the said stomach side sheet member 3, and the back | dorsal sheet member 4 were piled up, the said liquid-impermeable sheet | seat 12, the stomach side sheet member 3, and the back | dorsal sheet member 4 become It is directly joined by an adhesive.
Therefore, the said disposable diaper 1 has the structure of a complete 3 piece type disposable diaper among 3 piece type disposable diapers.

  In addition, the said absorber 13 has an absorber core which absorbs and hold | maintains a waste fluid substantially, and a coating sheet which has the liquid permeability which coat | covers the outer surface of this absorber core. In addition, as shown in FIG. 3, in this embodiment, the absorbent body 13 absorbs the absorbent core on both end sides in the width direction so that the absorbent body 13 can easily fit the base of the thigh of the wearer. Leg necks 13a, 13a that are curved so as to protrude toward the center of the width direction of the body 13 are formed.

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 substantially rectangular shape in plan view that is larger than the absorbent body 13 as a whole, and is joined to the absorbent body 13 by any joining means such as bonding with a hot-melt adhesive. .
The liquid permeable sheet 11 is formed of a nonwoven fabric, a woven fabric, a synthetic resin film in which liquid permeable holes are formed, a net-like sheet having a mesh, or the like.

In the present invention, examples of the nonwoven fabric used for the liquid-permeable sheet include natural fibers (for example, cotton), regenerated fibers (for example, rayon), synthetic resin fibers (for example, polyolefin such as polyethylene; polyethylene terephthalate, etc.). Polyester; polyamide such as nylon).
Non-woven fabrics include core-sheath fibers, side-by-side fibers, island-sea fibers, etc .; hollow fibers, flat fibers, Y-shaped fibers, C-shaped fibers, latent crimps, or actual wrinkles Three-dimensional crimped fibers of shrinkage; split fibers that are split by a physical load such as water flow, heat, embossing, and the like may be mixed.

On the other hand, the liquid-impermeable sheet 12 prevents permeation of excreted excreted liquid and prevents the excreted liquid from leaking to the outside. By means, they are joined to the absorber 13.
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 is bonded to each other by any bonding means such as bonding with an adhesive.
In addition, as this liquid-impermeable sheet, for example, a waterproof nonwoven fabric, a synthetic resin (for example, polyethylene, polypropylene, polyethylene terephthalate, etc.) film, a highly water-resistant meltblown nonwoven fabric is sandwiched between strong spunbond nonwoven fabrics An SMS nonwoven fabric or the like can be used.

  The absorbent core of the absorbent body 13 includes a water absorbent material such as pulp and a highly absorbent material such as a water absorbent polymer, and the lower side of the crotch portion of the wearer from the abdominal sheet member side. It extends long in the direction toward the back side seat member, and is formed in a band shape having a certain thickness.

  In the present invention, as the water-absorbing material forming the absorbent core, for example, wood pulp obtained from softwood or hardwood (for example, mechanical pulp such as crushed wood pulp; chemical pulp such as kraft pulp; semi-chemical pulp or the like) ); Mercerized pulp or cross-linked pulp obtained by chemically treating wood pulp; Non-wood pulp such as bagasse, kenaf, bamboo, hemp, cotton; Regenerated cellulose such as rayon and fibrillar rayon; Semi-synthetic such as acetate and triacetate Although cellulose etc. are mentioned, a ground pulp is preferable from the point that cost is low and it is easy to shape | mold.

  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, saponified starch-acrylonitrile copolymers, and crosslinked products of sodium carboxymethyl cellulose, and synthetic polymers. Examples of high water-absorbing materials include polyacrylates, polysulfonates, maleic anhydrides, polyacrylamides, polyvinyl alcohols, polyethylene oxides, polyaspartates, polyglutamates , Polyalginate-based, starch-based, and cellulose-based superabsorbent polymers (SAP), and the like. Among these, polyacrylate-based (particularly, sodium polyacrylate-based) superabsorbent Resins are preferred. Examples of the shape of the superabsorbent material include a particulate shape, a fibrous shape, a scale shape, and the like. .

  The covering sheet of the absorbent body 13 is not particularly limited as long as it has liquid permeability and absorbent body retainability, but is formed by a wet method using pulverized pulp as a main material from the viewpoint of low cost and absorbent body retainability. The tissue to be used is preferred.

In addition, as shown in FIGS. 1, 2, and 6, the pair of leak-proof walls 14 and 14 rises toward the skin surface of the wearer when worn, and the tip side comes into contact with the wearer, This is to prevent the excreted liquid from leaking outside between the skin surface of the wearer and the crotch sheet member 2.
The pair of leak-proof walls 14 and 14 are basically located 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, and the absorber The absorber 13 extends in the length direction so as to extend along both ends of the width direction of the absorber 13.
These leak-proof walls 14 and 14 preferably have hydrophobicity or water repellency so as to prevent leakage of excretory fluid, and may be made of a material such as a spunbond nonwoven fabric, an SMS nonwoven fabric, or an air-through nonwoven fabric. it can. In addition, elastic members 14a and 14a for leak-proof walls such as thread-like rubber extending in the length direction of the leak-proof walls 14 and 14 are disposed on the upper ends of the leak-proof walls 14 and 14, respectively. Each of the leak-proof walls 14 and 14 is easily adhered to the skin surface of the wearer.

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 abdomen side sheet member 3 includes an inner surface side sheet 16 positioned on the skin surface side of the wearer and an outer surface positioned on the side opposite to the skin surface of the wearer, 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 17 and the inner surface side sheet 16 and the outer surface side sheet 17, that is, in the length direction of the ventral sheet member 3. And a plurality of elastic members 18 extending linearly.

The inner surface side sheet 16 and the outer surface side sheet 17 in the ventral 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 these inner surface side sheet | seat 16 and outer surface side sheet | seat 17, 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 elastic members 18 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 form, rubber formed in a thread shape is used. These elastic members 18 are arranged between the inner surface side sheet 16 and the outer surface side sheet 17 in a state of being arranged in the width direction of the abdominal sheet member 3 at a predetermined interval, that is, in the vertical direction when worn. Contained. In addition, the adhesive agent is apply | coated to the outer peripheral surface of each elastic member 18, and each elastic member 18 is mutually joined with the said inner surface side sheet | seat 16 and the outer surface side sheet | seat 17 with this adhesive agent.
In addition, although the thickness of the elastic member of the abdominal sheet member in this invention is based also on the magnitude | size of the said disposable diaper whole, and the magnitude | size of the abdominal sheet member, it can be 400-1250 dtex, for example, Preferably it is 470. To 940 dtex, more preferably 620 to 780 dtex.
In this embodiment, the elastic member 18 is formed to be thicker than the other elastic members 18 (four in this embodiment) on the side of the waist opening 1a. The thick elastic members 18 on the part 1a side are all the same thickness (for example, about 940 dtex), and for the other elastic members 18, the other elastic members 18 are all the same thickness (for example, about 780 dtex). Yes.

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 sheet 21 positioned on the skin surface side of the wearer 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 22 and a plurality of sheets extending between the inner sheet 21 and the outer sheet 22 and extending in the width direction of the crotch sheet member 2, that is, in the length direction of the back sheet member 4. The elastic member is provided.

The inner surface side sheet 21 and the outer surface side sheet 22 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 21 and the outer surface side sheet 22 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 16 and the outer surface side sheet 17 of the abdominal sheet member 3. Can be formed.
The plurality of 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 is respectively used. Used. In addition, the adhesive agent is apply | coated to the outer peripheral surface of each elastic member, and each elastic member is mutually joined with the said inner surface side sheet | seat 21 and the outer surface side sheet | seat 22 with this adhesive agent.

By the way, the back sheet member 4 is formed such that the length in the width direction (vertical direction when worn) of the back sheet member 4 is larger than the length in the width direction of the ventral sheet member 3. At the time of wearing, it is the structure which can cover from a wearer's waist to the buttocks.
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 in this base | substrate part 8, some of these elastic members provided in the said back | dorsal sheet member 4 are the length direction of this back | dorsal sheet | seat member 4, ie, the length of this base | substrate part 8. It arrange | positions as the 1st elastic member 23 extended in a direction. The first elastic members 23 are positioned in the range of the base portion 8 in the back side seat member 4 in a state where they are arranged in the width direction of the base portion 8 at a predetermined interval, that is, in the vertical direction when worn. The inner sheet 21 and the outer sheet 22 are accommodated. In this embodiment, the same number of the first elastic members 23 are provided at the same intervals as the elastic members 18 of the ventral sheet member 3.
In addition, although the thickness of the 1st elastic member in this invention is based also on the magnitude | size of the said disposable diaper whole, and the magnitude | size of a back seat member, it can be 400-1250 dtex, for example, Preferably it is 470-940 dtex. More preferably, it is 620 to 780 dtex.
In this embodiment, the first elastic member 23 is formed to be thicker than the other first elastic members 23 in the number of four on the waist opening 1a side (four in this embodiment). In addition, the thick first elastic members 23 on the side of the waist opening 1a are all the same thickness (for example, about 940 dtex), and the other first elastic members 23 are also the same thickness (for example, 780 dtex). Degree).

On the other hand, as shown in FIGS. 3 to 5, the buttock covering portion 9 is an edge on the center side in the length direction of the crotch sheet member 2 in the width direction (vertical direction when worn) of the back side sheet member 4. A portion (hereinafter, simply referred to as an edge portion of the buttock covering portion (9)), that is, a lower end portion when worn is a central side in the length direction of the crotch sheet member 2 (a lower side when worn). It is the structure which protruded so that it might become convex.
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 collar cover portion 9, among the plurality of elastic members disposed on the back sheet member 4, an elastic member other than the first elastic member 23 disposed on the base portion is the collar cover portion. 9 is disposed as a second elastic member 24 at the edge portion 9a on the center side in the length direction of the crotch sheet member 2, that is, the edge portion on the lower end side when worn.
The second elastic member 24 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 24 as a whole is disposed along the edge portion 9a of the flange covering portion 9, 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 24 are provided, and these second elastic members 24 are arranged in the width direction of the base portion 8 at regular intervals, that is, in the vertical direction when worn. Are arranged between the inner surface side sheet 21 and the outer surface side sheet 22 positioned in the range of the flange covering portion 9.
The thickness of the second elastic member 24 is the same. The thickness of each second elastic member 24 can be set to, for example, 400 to 1250 dtex, preferably 470 to 940 dtex, and more preferably 620 dtex. In addition, the thickness of the second elastic member 24 is the first elasticity described in detail later in order to cover the buttocks without biting into the buttocks of the wearer and maintaining a comfortable wearing feeling. It is preferable to make the thickness smaller than the thickness of the members 23a and 23b (for example, the thickness of the second elastic member 24 is 620 dtex with respect to the thickness 780 dtex of the first elastic members 23a and 23b).

As shown in FIGS. 3, 5, and 7, the first elastic member 23 and the second elastic member 24 are located on the end side in the length direction of the back seat member 4. A part of each axial end portion is fixed to an inner sheet 21 and an outer sheet 22 that form the back sheet member 4 in a state of crossing each other.
Specifically, as described above, both end portions of the second elastic member 24 are in a state where they enter into a part of the base portion 8 on the side of the flange covering portion 9 as described above. However, the portion of the second elastic member 24 that has entered the base portion intersects with a part of the first elastic member 23 provided on the base portion 8.

In this embodiment, the end portions of the two first elastic members 23a, 23b located on the base portion 8 on the side of the buttock covering portion 9 (the lower side of the base portion 8 when worn), and three pieces Part of the second elastic members 24 a to 24 c on the end side is fixed in a state of intersecting with each other at the joint 5. Here, in the present invention, the fact that the first elastic member and the second elastic member intersect each other at the joint portion means that the intersection of the first elastic member and the second elastic member is located at the joint portion. In addition to the state where the first elastic member and the second elastic member are not located at the junction, each of the first elastic member and the second elastic member It also includes a state in which a part on the end side in the axial direction has reached the nearest joint part while maintaining a state where the parts cross each other.
In the case of this embodiment, among the three second elastic members 24a to 24c, the second elastic member 24a located closest to the base portion side has the two end side portions in the axial direction at the two ends. The first elastic members 23a, 23b of the back side sheet member 4 are crossed at positions close to the joint portion 5 (near the joint portion 5) at both end portions of the back-side sheet member 4, and both end portions remain in the crossed state. Is configured to reach both end portions of the back side seat member 4 (more specifically, the base portion 8), that is, the joining portions 5 and 5.
Of the three second elastic members 24a to 24c, the second elastic member 24b positioned between the two second elastic members 23a and 23c has both end portions in the axial direction. The first elastic member 23b positioned closest to the buttock covering portion of the two first elastic members, and intersecting at the positions near the joint portion 5 at both end portions of the back seat member 4, and While maintaining the crossed state, it reaches the both ends of the back side seat member 4 (base portion 8), that is, the joint portions 5 and 5 without crossing the other first elastic member 23a. The structure is
Further, the second elastic member 24c disposed at the position farthest from the base end portion 8 has both end portions in the axial direction at the most covering portion of the two first elastic members 23, 23. The first elastic member 23b located on the side of the portion 9 and the crossed first elastic member 23b are maintained in a state of being intersected at positions near the joint portion 5 at both end portions of the back seat member 4. The back sheet member 4 (base portion 8) is configured to extend to both ends of the back side sheet member 4 (base portion 8), that is, the joining portions 5 and 5.

  In this way, the first elastic member 23 and the second elastic member 24 are part of the respective axial end portions located on the end portions in the length direction of the back seat member 4. Are in a state in which the crotch sheet member 2 is pulled upward to fit the crotch sheet member 2 to the wear site of the wearer.

As described above, when the wearer lifts the disposable diaper, the crotch sheet member lifts the disposable diaper due to friction between the wearer's thigh and the edge of the crotch opening of the disposable diaper. Since a force in the direction opposite to the direction acts, the crotch sheet member is easily pulled down by being pulled downward, and may not be easily fitted to the wearing site. In addition, when the absorbent body absorbs and holds excrement such as urine after wearing the disposable diaper, the crotch sheet member tends to hang downward due to the weight of the absorbent body. In this case, the crotch sheet member is less likely to fit the wearer's wearing site.
Therefore, in this invention, about the said 1st elastic member 23 and the said 2nd elastic member 24, the edge part side of each axial direction located in the edge part side of the length direction of the said back | dorsal seat member 4 The first elastic member 23 and the second elastic member 24 cooperate to pull up the crotch sheet member upward so that the state can be maintained. Thereby, the fitting feeling of the crotch sheet member 2 at the time of wearing and after wearing can be ensured.

More specifically, when the back-side sheet member 4 is pulled in the length direction of the back-side sheet member 4 by expanding the waist opening 1a of the disposable diaper 1 when worn, the first elastic member 23 is pulled in the length direction, and the second elastic member 24 (that is, the second elastic member 24 intersecting with the first elastic member 23 (first elastic members 23a and 23b in this embodiment)). The elastic members 24a-24c) are pulled up.
At this time, the buttock covering portion 9 on which the second elastic member 24 is disposed is pulled upward, and the crotch sheet member 2 joined to the buttock covering portion 9 is lifted upward. As a result, the crotch sheet member 2 rises to the height of the leg opening 1b, 1b, so that the opening direction of the leg opening 1b, 1b approaches the pulling direction of the disposable diaper 1.

On the other hand, when the disposable diaper 1 is pulled upward, the abdominal sheet member 3 or the back sheet member 4 is pulled. At this time, the first elastic member 23 or the second elastic member alone is pulled. 24 elastically raises the crotch sheet member 2 upward.
Thereby, even if a downward force acts on the crotch sheet member 2 due to friction between the wearer's thigh and the edge portions of the leg opening portions 1b and 1b, Since the second elastic member 24 can pull the crotch sheet member 2 up to the wearer's wear site, the crotch sheet member 2 can be fitted to the wear site.
Even when the crotch sheet member 2 is pulled downward by absorption and retention of excrement by the absorbent body 13, the second elastic member 24 is connected to the crotch sheet member through the buttock covering portion 9. 2 is elastically pulled upward. Further, the first elastic member 23 intersecting the second elastic member 24 has a first elastic force that pulls the crotch sheet member 2 acting on the second elastic member 24 downward. The members 23 are dispersed in the axial direction.
Accordingly, in order to reduce the load acting on the second elastic member 24, the crotch sheet member 2 is lifted more stably regardless of the weight of the absorbent body 13, and the raised state is stable. As a result, it is possible to ensure a good fit of the crotch sheet member 2 after wearing.

In this embodiment, since the first elastic member 23 and the second elastic member 24 intersect at the joint portions 5 and 5, the first elastic members intersect each other. 23 and the second elastic member 24 are interlocked with the movements of the ventral sheet member 3 and the dorsal seat member 4 or the movements of both the ventral sheet member 3 and the dorsal seat member 4. Can be expanded and contracted.
That is, the first elastic member 23 (23a, 23b) and the second elastic member 24 intersecting each other are, for example, when the waist opening is pushed out or when the disposable diaper 1 is pulled up. Since it can expand and contract in conjunction with the movement of the abdominal sheet member 3 and the dorsal sheet member 4, the crotch sheet member 2 can be fitted to the wearing site more efficiently, and thereby the disposable diaper 1 can be further improved.

Here, the second elastic member 24 has a crotch rather than a portion (hereinafter referred to as a first portion) joined to the crotch sheet member 2 in the buttock covering portion 9 of the back sheet member 4. The portion not joined to the part sheet member 2 (hereinafter referred to as the second portion) is fixed to the edge portion 9a of the collar covering portion 9 in a contracted state.
That is, at the time of manufacturing the disposable diaper 1, a portion of the second elastic member 24 that is located in the second portion of the buttock covering portion 9 is extended as compared with a portion that is located in the first portion. By fixing to the inner surface side sheet 17 and the outer surface side sheet 18 that form the collar part covering part 9, the edge part 9a of the collar part covering part 9 and the vicinity thereof contract more in the second part than in the first part. It is in a state of being.
Thereby, in the edge part 9a of the collar cover part 9 and its vicinity, the 2nd part of the said collar part cover part 9 has a big bending compared with the said 1st part, and is the axis line from the natural length of the 2nd elastic member 24. The extension length in the direction is also large. In addition, as the second elastic member 24 extends, the second portion has a strong elastic contraction force due to the elastic force of the portion of the second elastic member 24 located at the second portion. Become.

Therefore, when the wearer wears the second portion of the buttock covering portion 9, the edge portion 9a of the buttock covering portion 9 is appropriately extended according to the size and bulge of the wearer's buttock, By the expansion and contraction due to the elastic force of the portion located in the second portion of the second elastic member 24, it is possible to stably fit the wearer's buttocks and make it difficult to bend.
Further, the portion of the second elastic member 24 positioned at the second portion can be extended longer than the portion of the second elastic member 24 positioned at the first portion. Since the part located in the second part of the elastic member 24 tends to contract with a strong force according to the extension length, the crotch sheet member 2 can be pulled up more effectively.
Moreover, about the 1st part of the said collar part coating | coated part 9, the stretchability to the said crotch sheet member 2 is moderately stretched by the expansion-contraction of the part located in this 1st part in the said 2nd elastic member 24. On the other hand, the collar cover portion 9 prevents the crotch sheet member 2 from being compressed in the width direction of the crotch sheet member 2 by the elastic force of the second elastic member 24 as much as possible. be able to. Thereby, compression of the said absorber 13 can be suppressed as much as possible, and a fall of an absorptivity and the reduction | decrease of the area which receives excrement in the liquid-impermeable sheet 12 side can be suppressed.

In addition, about the said 2nd elastic member 24, the part located in the 1st part of the said collar part covering part 9 is 1.2 of natural length of this 2nd elastic member 24 at the time of manufacture of the said disposable diaper 1. As shown in FIG. It is preferable to fix to the inner surface side sheet member 21 and the outer surface side sheet member 22 that form the flange covering portion in a state of being stretched about twice. On the other hand, the portion of the second elastic member 24 that is located at the second portion of the collar cover portion 9 is 2.0 times the natural length of the second elastic member 24 when the disposable diaper 1 is manufactured. It is preferable to fix to the inner surface side sheet member 21 and the outer surface side sheet member 22 which form the said collar part coating | coated part in the state extended | stretched to the extent.
Further, in this embodiment, the first portion of the flange covering portion 9 is the curved portion of the edge portion 9a of the flange covering portion, and the second portion is the straight portion of the edge portion 9a of the flange covering portion 9. As part.

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 Adhesive portions 5 and 6 to be joined to each other by an adhesive are provided at portions where the seat member 3 and the back seat member 4 are overlapped and abutted with each other. Therefore, the liquid-impermeable sheet 12 and the abdominal sheet member 3 of the crotch sheet member 2 are bonded by the adhesive part 5, and the liquid-impermeable sheet 12 and the back-side sheet member 4 of the crotch sheet member 2 are Are joined by the adhesive portions 6.
Specifically, a portion of the liquid-impermeable sheet 12 of the crotch sheet member 2 where the liquid-impermeable sheet 12 comes into contact with the abdomen-side sheet member 3 and the back-side sheet member 4, that is, liquid-impermeable. First adhesive portions 26 and 27 are formed on both ends of the sheet 12 in the length direction.
On the other hand, in the abdomen side sheet member 3 and the back side sheet member 4, second adhesive portions 28 and 29 are respectively formed at portions that contact the both end sides in the length direction of the liquid-impermeable sheet 12. ing.

As shown in FIGS. 5 and 8B, the first adhesive portions 26 and 27 are respectively disposed on the center side in the width direction of the liquid-impermeable sheet 12 in the crotch sheet member 2. ing.
The first adhesive portions 26 and 27 are provided with first adhesive application regions 30 and 31 that are continuous in the length direction of the liquid-impermeable sheet 12, respectively. It should be noted that the first adhesive application region 30 is formed on the first adhesive portion 26 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 30 is provided in each of the first adhesive portions 26 formed on the side.
Therefore, the crotch sheet member 2 is formed on the inner side sheet member 16, 21 respectively. At this time, there are regions where the first adhesive portions 26 and 27 do not exist on both end sides in the width direction of the liquid-impermeable sheet 12. Further, the first adhesive portions 26, 27 do not exist on the pair of leak-proof walls 14, 14 in the crotch sheet member 2.

Further, as shown in FIG. 5, of the first adhesive portions 26 and 27, a part of the first adhesive portion 27 located on the end side to be joined to the back sheet member 4 is bonded at the time of joining. In the back side sheet member 4, the liquid impervious sheet 12 extends to the center side in the length direction until it overlaps with a portion where the second elastic member 24 of the collar covering portion 9 is located.
Thus, the crotch sheet member 2 and the portion of the buttock covering portion 9 of the back sheet member 4 where the second elastic member is positioned are joined to each other through the first adhesive portion 27. It becomes.

In this way, a part of the first adhesive portion 27 provided on the end portion side to be joined to the back sheet member 4 is joined to the second portion of the collar covering portion 9 in the back side sheet member 4 at the time of joining. The reason why the liquid impervious sheet 12 is configured to extend to the center side in the longitudinal direction up to a position overlapping the portion where the elastic member 24 is located is as follows.
That is, when the disposable diaper 1 is worn or when the absorbent body 13 becomes heavy due to absorption and retention of excrement, the crotch sheet member 2 hangs down and the crotch sheet member 2 This is to suppress as much as possible the difficulty of fitting to the wearing site.
As described above, the diaper is absorbed and retained by friction between the thigh of the wearer and the edge of the leg opening 1b, 1b of the disposable diaper 1 or when the disposable diaper is worn. Since the crotch sheet member 2 tends to hang downward due to the weight of the absorbent body 13, the crotch sheet member 2 may not easily fit the wearer's wearing site.
Therefore, a part of the first adhesive portion 27 is extended to a position overlapping the portion where the second elastic member 24 of the flange covering portion 9 is located, and the second elastic member 24 in the flange covering portion 9 is arranged. The installed position and the crotch sheet member 4 can be joined, and the downward force acting on the crotch sheet member 9 is reliably transmitted to the second elastic member 24. As a result, the crotch sheet member 2 is stably lifted upward by the elastic force of the second elastic member 24, so that the crotch sheet member 2 is worn when and after the disposable diaper 1 is worn. It can be made to fit stably by a person's wearing part.

The first adhesive application areas 30 and 31 are located within the range of the first adhesive portions 26 and 27 from the position of the closest end portion side in the length direction of the liquid-impermeable sheet 12. The liquid-impermeable sheet 12 is applied toward the central position in the length direction.
Depending on the width of the first adhesive application regions 30 and 31 and the application pattern of the adhesive 29 to be described later, it may be singular or plural. In this embodiment, the first adhesive portion 26 and 27 are a mode in which a plurality of the first adhesive application regions 30 and 31 are provided in a state of being arranged in the width direction of the liquid-impermeable sheet 12.
Further, as shown in FIG. 8, the first adhesive application area 31 of the first adhesive part 27 is arranged on the first adhesive part 27 provided on the end part side to be joined to the back sheet member 4. Of these, the first adhesive application areas 31 a and 31 a located on both end sides in the width direction of the crotch sheet member 2 are compared to the other first adhesive application areas 31. The length in the length direction is shortened. Here, the length in the length direction of the crotch sheet member 2 of the first adhesive application regions 31a and 31a located on both ends in the width direction of the crotch sheet member 2 is the back sheet. The length of the second adhesive portion 29 provided on the member 4 in the width direction of the back sheet member 4 is substantially the same. The first adhesive application region 31 other than the first adhesive application regions 31a, 31a located on both end sides in the width direction of the crotch sheet member 2 is the second elastic member of the buttock covering portion 9 The liquid impervious sheet 12 extends to the center side in the length direction up to a position where it overlaps with a portion where 24 is located.

Here, the reason why the first adhesive portions 26 and 27 are provided on the liquid-impermeable sheet 12 of the crotch sheet member 2 is that the adhesive 29 is efficiently applied to the liquid-impermeable sheet 12. This is for the purpose and stability.
Usually, when manufacturing a disposable diaper, the crotch sheet member is conveyed in the length direction of the crotch sheet member up to a predetermined position before being joined to the abdominal sheet member or the back sheet member. The Therefore, the application of the adhesive to the liquid-impermeable sheet during the conveyance of the crotch sheet member is most efficient when applied along the length direction that is the conveyance direction of the crotch sheet member, In addition, since the application itself is easy and there are few failures, the application can be performed stably.

Any adhesive 29 can be used as the adhesive 29 applied to the first adhesive application areas 30 and 31, but a hot melt adhesive is most preferable.
Examples of the hot melt adhesive include polyolefin (for example, polyethylene and polypropylene), ethylene / vinyl acetate copolymer system, synthetic rubber (for example, styrene / isoprene / styrene (SIS), styrene / butadiene / styrene (SBS)). ), Styrene-based polymers such as styrene-ethylene-butylene-styrene (SEBS), butadiene-based polymers, isoprene-based polymers).
In addition, as other adhesives, an acrylic resin-based pressure-sensitive adhesive can be used.

Moreover, as an application pattern of the adhesive 29 applied to the first adhesive application regions 30 and 31, any pattern can be used, for example, spiral, omega (Ω) shape, broken line, curve An arbitrary coating pattern such as a straight (bead) shape or a strip shape wider than the linear coating pattern can be used.
As for the application pattern of the adhesive 29, if the first adhesive application areas 30, 31 themselves are considered to be continuous in the length direction of the crotch sheet member 2, the adhesive 29 is The application pattern need not be applied continuously in the first adhesive application areas 30 and 31.
That is, for example, in the first adhesive application areas 30 and 31, the adhesive 29 is intermittently applied in the form of dots (dots) or broken lines in the length direction of the crotch sheet member 2. You may do it.
Furthermore, as a method of applying the adhesive 29, a method of spraying an adhesive from one or a plurality of nozzles to apply a single or a plurality of linear or dotted various application patterns, or a site to be applied by a roll or the like. Any coating method can be used, such as a method of coating the adhesive with a surface or a dot pattern on the surface, or a method of spraying and coating the adhesive from a nozzle.

It should be noted that the application amount of each adhesive 29 in each first adhesive application region 30, 31 is the total number or length of the first adhesive application regions 30, 31 in the first adhesive portions 26, 27. Depending on the application pattern of the adhesive 29, it can be selected appropriately. The application amount of the adhesive in each first adhesive application region in the present invention is preferably ² to 25 g / m ² , more preferably 4 to 22 g / m ² , more preferably 5 to 19 g / m ^2. It is to be about.
If it is less than 2 g / m ² , the adhesive force is insufficient, and the second adhesive part cannot be joined well, and may be easily peeled off. Conversely, if it exceeds 25 g / m ² , each sheet member 2 ~ 4 can be hardened by the adhesive 29 and stiff.

Furthermore, as shown in FIG. 8 (b), in this embodiment, the plurality of first adhesive application regions 30, 31 are the same among the first adhesive application regions 30, 31. The first adhesive application areas 30 and 31 located on both ends in the width direction of the liquid-impermeable sheet 12 in the crotch sheet member 2 are adjacent to the other adjacent first adhesive application areas 30 and 31. The gaps 39 and 40 are provided between them, respectively.
By providing the gaps 39 and 40, the first adhesive application region 30 located on both ends in the width direction of the liquid-impermeable sheet 12 that is most susceptible to the movement of the crotch sheet member 2. , 31 can be suppressed as much as possible from spreading to other adjacent first adhesive application regions 30, 31. As a result, the crotch sheet member 2 (more specifically, the liquid-impermeable sheet 12) is pulled away from the abdominal sheet member 3 and the back sheet member 4 in the first adhesive application regions 30 and 31. , It is possible to deter the dropout.

On the other hand, as shown in FIGS. 5 and 8A, the second adhesive portions 28 and 29 are provided on the inner surface side sheet 16 of the ventral sheet member 3 and the inner surface side sheet 21 of the back side sheet member 4. The crotch sheet member 2 is provided at a position where the crotch sheet member 2 comes into contact with the liquid-impermeable sheet 12, more specifically, at a position where the crotch sheet member 2 overlaps the first adhesive portions 26 and 27 provided on the liquid-impermeable sheet 12. ing.
Further, the second adhesive portion 28 provided on the ventral sheet member 3 has a second continuous portion in the width direction of the crotch sheet member 2, that is, in the length direction of the ventral sheet member 3. Two adhesive application areas 33 are provided. On the other hand, the second adhesive portion 29 provided on the back sheet member has a second continuous portion in the width direction of the crotch sheet member 2, that is, in the length direction of the back sheet member 4. An adhesive application region 34 is provided.
In this embodiment, the second adhesive portions 28 and 29 have the second adhesive application regions 33 and 34 in the length direction of the crotch sheet member 2, that is, the ventral sheet member 3 and It is the aspect provided with two or more in the state located in a line with each width direction of the back | dorsal sheet | seat member 4. FIG.

Further, as shown in FIG. 5, the lengths of the second adhesive portions 28 and 29, that is, the lengths of the abdominal sheet member 3 and the back sheet member 4 in the length direction, are the second lengths. The width of the first adhesive portions 26 and 27 joined to the adhesive portions 28 and 29, that is, the length in the width direction of the crotch sheet member 2 in the first adhesive portions 26 and 27 is formed to be approximately the same length. Has been. And these 2nd adhesion parts 28 and 29 and the 1st adhesion parts 26 and 27 are the position of the both ends of the length direction in these 2nd adhesion parts 28 and 29, and this 1st adhesion part. It joins in the state which the position of the both ends of the width direction in 26 and 27 substantially corresponded mutually.
Therefore, the crotch sheet member 2 has the width direction of the ventral sheet member 3 and only in the region where both the first adhesive portions 26 and 27 and the second adhesive portions 28 and 29 exist. Joining with the back seat member 4 is performed.
At this time, as described above, since there is a region where the first adhesive portions 26 and 27 do not exist on both end sides in the width direction of the liquid impermeable sheet 12, the crotch sheet member 2 includes: The crotch sheet member 2 is not joined to the abdomen sheet member 3 and the dorsal sheet member 4 at both end portions in the width direction of the crotch sheet member 2 in the portion overlapped with the ventral sheet member 3 and the dorsal sheet member 4. Non-joining regions 36, 36, 37, and 37 are formed, respectively.

As shown in FIG. 5, the non-joining regions 36, 36, 37, and 37 are located on the inner side (the center in the width direction) of the crotch sheet member 2 in the non-joining regions 36, 36, 37, and 37. Further, it extends to the portion corresponding to the position entering the inner side in the width direction of the absorber 13 (the center side in the width direction) rather than the both end portions in the width direction of the absorber 13.
That is, the non-joining regions 36 and 36 are provided between the liquid-impermeable sheet 12 and the ventral sheet member 3 of the crotch sheet member 2, and the non-joining regions 37 and 37 are provided on the crotch sheet member 2. Between the liquid-impermeable sheet 12 and the back sheet member 4, it is formed so as to enter the inner side in the width direction of the absorber 13 with respect to the positions on both ends in the width direction of the absorber 13. .

As described above, the non-joining regions 36, 36, 37, and 37 are provided so that the absorber 13 is free without being restricted by the presence or movement of the ventral seat member 3 and the back seat member 4. This is because it can be easily stretched and deformed to easily fit the wearer's skin, and the volume of the absorbent body 13 and the area of the liquid-permeable sheet 11 that receives the excrement are widened.
In particular, in the buttock covering portion 9 of the back side seat member 4, the second elastic member 24 exerts a force that the buttock covering portion 9 elastically contracts in the width direction. When the joining regions 37, 37 do not exist, a force that compresses in the width direction acts on the absorber 13 through the flange covering portion 9. If it does so, the magnitude | size of the said absorber 13 will become small and not only the area at the side of the liquid-permeable sheet 11 which receives excrement will become small, but the volume may become small and an absorptivity may be impaired. Since the free deformation and expansion / contraction of the absorbent body 13 are restricted, it is difficult to fit the wearer's skin.
Therefore, the non-joining regions 36, 36, 37, 37 are provided so that the absorber 13 can be contracted and deformed relatively easily without being restrained by the abdominal sheet member 3 and the back sheet member 4. ing.

In addition, since the non-bonding regions 36, 36, 37, and 37 are formed, the second adhesive portions 28 and 29 do not contact the pair of leak-proof walls 14 and 14. The leak-proof walls 14 and 14 themselves are basically not joined to the abdominal sheet member 3 and the base portion 8 and the buttock covering portion 9 of the back-side sheet member 4.
Thereby, the pair of leak-proof walls 14 and 14 are not affected by the movement of the base portion 8 and the buttock covering member 9 of the abdominal side sheet member 3 and further the back side sheet member 4 when worn. It is possible to stably maintain the state in which the distal end side rises upward, and it is possible to reliably fit the distal end side of each leakage prevention wall 14, 14 to the wearer's skin.

Further, in the non-joining regions 36, 36, 37, 37, the deformation / extension of the absorber 13 is relatively free without being constrained by the ventral seat member 3 and the back seat member 4, As shown in FIG. 6, the end portions of the absorbent body 13 in the width direction are easily curved along the rising direction of the pair of leak-proof walls 14 and 14, thereby allowing the excrement to flow outward. It becomes possible to prevent leakage more reliably.
In particular, with respect to the back sheet member 4 side of the crotch sheet member 2, in general, when the wearer lies on his back, excrement can easily leak out from the leg openings 1b and 1b. It is effective because of its characteristics. That is, the crotch sheet member when the entire absorbent body 13 is worn is provided by providing the non-joining regions 36, 36, 37, and 37 so as to stably maintain the state in which the pair of leak-proof walls 14 and 14 are raised. In accordance with the curve in the width direction 2, both ends in the width direction are curved along the rising direction of the leakage prevention walls 14, 14, so that excrement can be efficiently absorbed and leakage is effectively performed. Can be prevented.

In the range of the second adhesive portions 28 and 29, the second adhesive application areas 33 and 34 are the first adhesive of the crotch sheet member 2 in the second adhesive portions 28 and 29. The adhesive 26 is applied so as to extend from a position corresponding to one end in the width direction toward a position corresponding to the other end.
In this embodiment, second adhesive application regions 33 and 34 are arranged in the second adhesive portions 28 and 29 in the width direction of the ventral sheet member 3 and the back sheet member 4, respectively. In this state, a plurality are provided.

As shown in FIG. 8 (a), in this embodiment, each second adhesive application region 33, 34 itself is spaced from another adjacent second adhesive application region 33, 34. Instead, they are arranged in contact with each other.
In this case, the adhesive applied to each of the second adhesive application regions 33 and 34 is in contact with or overlapped with the adhesive applied to the other adjacent second adhesive application regions 33 and 34. There is a part that has been made, and the adhesive is integrated into that part.
However, even if the second adhesive application areas 33 and 34 are in contact with each other or overlap, the adhesives may not be in contact with each other or may not overlap depending on the application pattern, but the adhesives are not necessarily in contact with each other or overlap. Since it is not necessary, an appropriate application pattern can be freely selected.

Here, the second adhesive portions 28 and 29 are provided on the ventral sheet member 3 and the dorsal sheet member 4, respectively, because the adhesive is applied to the ventral sheet member 3 and the dorsal sheet member 4. It is for performing application | coating efficiently and stably.
Usually, when manufacturing a disposable diaper, the abdominal sheet member and the back sheet member are conveyed in the length direction of the abdomen sheet member and the back sheet member to a predetermined position. Therefore, the application of the adhesive during the conveyance of the abdominal sheet member and the back sheet member is performed along the length direction which is the conveyance direction of these abdominal sheet member and the back sheet member. Since it is the most efficient, the application itself is easy to perform, and there are few failures, it is possible to perform the application stably.

As for the adhesive applied to the second adhesive application areas 33, 34, it is preferable to basically use the same adhesive as that used in the first adhesive application areas 30, 31. As in the case of the first adhesive application areas 30 and 31, a hot melt adhesive is most preferable. The material of the hot melt adhesive is the same as that in the first adhesive application areas 30 and 31.
The adhesive application pattern applied to the second adhesive application areas 33 and 34 is basically the same as the adhesive application pattern in the first adhesive application areas 30 and 31. However, it may be a different coating pattern. The type and application method of the adhesive application pattern applied to the second adhesive application areas 33 and 34 are basically the same as those of the first adhesive application area. Omitted.

Further, the amount of each adhesive applied in each of the second adhesive application regions 33 and 34 is the total number, length, and length of the second adhesive application regions 33 and 34 in the second adhesive portions 28 and 29. It is set according to the application pattern of the adhesive. The application amount of the adhesive in each second adhesive application region is preferably ² to 25 g / m ² , more preferably 4 to 22 g / m ² , more preferably about 5 to 19 g / m ² . That is. If less than 2 g / m ^2, junction unsuccessful the first adhesive portion 26 adhesion is insufficient, and may peel off easily pull becomes 25 g / m ² than the opposite of each sheet member 2 to 4 are hardened by the adhesive and may be stiff.

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 30 and 31 in the first adhesive portions 26 and 27 and the second adhesive application regions 33 and 34 in the second adhesive portions 28 and 29. 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 30 and 31 and the adhesive applied to the second adhesive application areas 33 and 34 also intersect each other. The adhesive application regions 30 and 31 are in contact with the second adhesive portions 28 and 29, and the second adhesive application regions 33 and 34 are in contact with the first adhesive portions 26 and 27, respectively. The Rukoto.

In this way, the first adhesive application areas 30 and 31 in the first adhesive portions 26 and 27 intersect with the second adhesive application areas 33 and 34 in the second adhesive portions 28 and 29. The crotch sheet member 2 and the abdominal sheet member 3 and the back sheet member 4 are joined together so that the crotch sheet member 2 that has become heavy due to the excrement fluid of the wearer is held firmly. It is to do. Furthermore, this is to prevent the crotch sheet member 2 from being separated from the ventral sheet member 3 and the back sheet member 4 due to its weight and falling off.
That is, as already described, when the disposable diaper excretes excretory fluid such as urine from the wearer, the disposable diaper absorbs and holds the excreted fluid by the absorber provided in the crotch sheet member. Therefore, the crotch sheet member becomes heavy, and the crotch sheet member is pulled downward by the weight.
Therefore, the crotch sheet member 2 is pulled up by the first adhesive application regions 33 and 34 continuous in the length direction of the crotch sheet member 2 so as not to sag as much as possible. . On the other hand, in the second adhesive application regions 33 and 34 intersecting with the first adhesive application regions 30 and 31, a downward tensile force acting on the first adhesive application region 28 is applied to the crotch sheet. The members 2 are dispersed in the width direction. As a result, the first adhesive application region and the second adhesive application region cooperate to make it difficult for the crotch sheet member to hang down and stably maintain the pulled-up state.

By the way, as shown in FIG. 5 and FIG. 8A, the abdominal sheet member 3 and the back sheet member 4 are at least a part of the plurality of elastic members 18 disposed on the abdominal sheet member 3, In addition, at least a part of the plurality of first elastic members 23 disposed on the base portion 8 of the back seat member 4 is disposed at a position corresponding to the second bonding portions 28 and 29. .
As a result, the downward force acting on the joint portion between the second adhesive portions 28 and 29 and the first adhesive portions 26 and 27 due to the weight of the crotch sheet member 2 is applied to the ventral sheet member 3. Through the elastic member 18 and the first elastic member 23 disposed on the base portion 8 of the back side sheet member 4, it can be dispersed in the length direction of the abdominal side sheet member 3 and the back side sheet member 4. Therefore, the crotch sheet member 2 is less likely to hang down, and the pulled-up state can be more stably maintained.

Hereinafter, the manufacturing method which manufactures the disposable diaper which has the said structure using FIG. 9 is demonstrated.
As a basic flow of the manufacturing method of the disposable diaper, as a preparation step, a step S1 of forming a laminate for the crotch sheet member, a composite member for a ventral sheet member, and a composite member for a back sheet member 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.

First, as a preparatory step, step S1 for forming the laminate for the crotch sheet member and step S2 for forming a composite member for the abdomen sheet member and a composite member for the back sheet member are performed.
The step S1 for forming the laminate for the crotch sheet member will be described.
That is, in this step S1, a liquid-permeable sheet, a liquid-impermeable sheet, an absorber, and a pair of leak-proof walls constituting the crotch sheet member 2 are laminated. And the long laminated body 41 for crotch sheet members is formed in the conveying direction (however, the liquid-permeable sheet, the liquid-impermeable sheet, and the pair of leak-proof walls are long formed in the conveying direction. Scale). Thereafter, the laminate 41 for the crotch sheet member is transported toward the next step S3 in which the crotch sheet member 2 and the first adhesive portions 26 and 27 are formed.
The laminate 41 for the crotch sheet member is in a state before the individual crotch sheet members 2 are formed, in which a plurality of crotch sheet members 2 are substantially continuous in the length direction. 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.
This process S2 is carrying out the nonwoven fabric 46 for the outer surface side sheet | seats 4 while conveying the nonwoven fabric 46 for elongate outer surface side sheets which forms the outer surface side sheets 17 and 22 of the said stomach side sheet member 3 and the back side sheet member 4. A plurality of long elastic members 47 to 49 that extend in the length direction of the nonwoven fabric 46 for the outer surface side sheet, and are expanded or contracted from the natural length to a predetermined magnification in the length direction (axial direction). Is disposed.
At this time, at a position corresponding to the plurality of elongated belly sheet member elastic members 47 disposed at positions corresponding to the composite member 50 for the ventral sheet member and the composite member 51 for the back sheet member. The plurality of long elastic members 48 and 49 for the back-side seat member are arranged at predetermined intervals. Further, the plurality of long elastic members 47 to 49 are arranged in a state in which the axial direction of the plurality of long elastic members 47 to 49 faces the length direction of the nonwoven fabric 46 for the outer surface side sheet. Is done.
The abdomen sheet member composite member 50 forms the abdomen sheet member 3 in the finished disposable diaper 1, and the back sheet member composite member 51 is the disposable diaper 1. The back seat member 4 is formed.

Here, the elastic members 48 and 49 for the back-side sheet member are 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.
In addition, the said 1st elastic member 48 for back side seat members becomes the 1st elastic member 23 provided in the back side seat member 4 in the said disposable diaper 1 as a finished product, The said 2nd back side seat member The elastic member 49 is a second elastic member provided on the back sheet member 4 of the disposable diaper 1.

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.
In this embodiment, as described above, the central portion in the width direction of the back sheet member at the edge portion 9a of the collar cover portion 9 is substantially straight in the same direction as the length direction of the collar cover portion. It becomes the linear part extended in the shape. Therefore, about the part of the elastic member 49 for 2nd back side sheet members located in this linear part, the axial direction is arrange | positioned in the state which faced the length direction of the nonwoven fabric 46 for the said outer surface side sheets.
As for the second elastic member 49 for the back side seat member, the portion located in the linear portion has a natural length of about 1 per unit length of the elastic member 49 for the second back side seat member. About the curved portion which is a portion other than the linear portion in the edge portion 9a of the flange covering portion 9, the outer surface side in a state where the natural length per unit length is approximately doubled. It is preferable to arrange on the nonwoven fabric 46 for sheets substantially linearly.

At this time, a predetermined number (two in this embodiment) of the first dorsal sheet member elastic members 48 in the first dorsal sheet member elastic member 48 on the side of the collar covering portion 9 is used. The member 48 and the second elastic member 49 for the back sheet member are arranged in the length direction of the back sheet member 4 of the disposable diaper 1 as a finished product on the nonwoven fabric 46 for the outer sheet. It arrange | positions so that it may be in the state which mutually crossed in the vicinity of the part corresponded to an edge part side.
Thus, the disposable diaper 1 as a finished product has both ends in the axial direction of the first elastic member 23 and the second elastic member 24 at both ends in the length direction of the back sheet member 4. A state in which the part sides cross each other is formed.

Then, on the non-woven fabric 46 for the outer side sheet on which the long elastic member 47 for the ventral sheet member and the long elastic members 48, 49 for the back dorsal sheet member are arranged, the ventral sheet member 3 and a long non-woven fabric 52 for inner surface side sheets forming the inner surface side sheets 16 and 21 of the back side sheet member 4 are laminated to form a long composite member 53 extending in the conveying direction.
The composite member 53 is a combination of the composite member 50 for the ventral sheet member and the composite member 51 for the back seat member.

And while conveying the said composite member 49 to a length direction, this composite member 53 is cut | disconnected and divided | segmented into two by the cutter 55 in the predetermined position of the width direction of the composite member 53, and it becomes individual belly. A long composite member 50 for the abdomen seat member and a long composite member 51 for the back seat member are formed before being divided into the side seat member 3 and the back seat member 4, respectively. To do.
In this stage, the abdomen sheet member composite member 50 and the back sheet member composite members 50 and 51 are formed of the abdomen sheet member 3 and the back sheet member 4 of the disposable diaper 1 as a finished product. Each of them is in a state of being connected in a plurality, and is divided into individual abdominal sheet members 3 and back sheet members 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.
Thereafter, the second adhesive portion, which is the next process, is formed while maintaining the state where the abdomen-side sheet member composite member 50 and the back-side sheet member composite member 51 are arranged at a constant interval. It conveys toward process S4.

After step S1 of forming the laminate for the crotch sheet member, step S3 of forming the crotch sheet member 2 and the first adhesive portions 26 and 27 from the laminate 41 for the crotch sheet member is performed. .
In this step S3, the first adhesive portions 26 and 27 are formed by applying various adhesives such as a hot melt adhesive to the liquid-impermeable sheet in the laminate 41 for the crotch sheet member that has been conveyed. Form.
In forming the first adhesive portions 26 and 27, the length of the crotch sheet member 2 in the longitudinal direction is determined with respect to the laminate 41 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. .
And the 1st adhesive agent application | coating area | regions 30 and 31 which continue toward the length direction of the liquid-impermeable sheet 12 in the said crotch sheet | seat member 2 are provided.
In this embodiment, the laminate 41 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 41 for the crotch sheet member.

Further, the laminate 41 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 41 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 26 and 27 of the crotch sheet members 2 and 2 are formed simultaneously by applying the adhesive to the position.
Specifically, the adhesive 29 is applied to the laminate 41 for the crotch sheet member in consideration of a predetermined length in the length direction of the crotch sheet member 2 at a predetermined interval. By applying the first adhesive application region over both the tail end side of the portion corresponding to the preceding crotch sheet member 2 and the position of the tip end side of the portion corresponding to the adjacent subsequent crotch sheet member 2 31 and 30 and the first adhesive portions 27 and 26 (in the case of FIG. 9, the first adhesive portion 27 on the tail end side of the portion corresponding to the preceding crotch sheet member 2 and the subsequent crotch sheet member The first adhesive portion 26) is simultaneously formed on the tip side of the portion corresponding to 2.

In this embodiment, when the first adhesive portions 26 and 27 are formed, the first adhesive application regions 30 and 31 are arranged in the width direction of the laminate 41 for the crotch sheet member. A plurality are provided in the state. At this time, the first adhesive application regions 30 and 31 are formed in the length direction of the crotch sheet member laminate 41, that is, in the length direction of the portion corresponding to the crotch sheet member 2. .
Further, among the plurality of first adhesive application regions 30 and 31, the first adhesive application regions 30 and 31 positioned on both end sides in the width direction of the laminate 41 for the crotch sheet member are adjacent to each other. It arrange | positions in the state which provided the clearance gap between the other suitable 1st adhesive agent application | coating areas 30 and 31, respectively. As a result, the gap 39 between the first adhesive application regions 30, 31 located on both end sides in the width direction of the crotch sheet member 2 is adjacent to the other adjacent first adhesive application regions 30, 31. Will be arranged in a state where each is provided.

Note that when forming the first adhesive portions 26 and 27, the adhesive material, the application pattern, and the application method of the first adhesive application regions 30 and 31 are arbitrarily selected as described above. can do.
As for the application method, for example, as shown in FIG. 9, a crotch part being conveyed using an adhesive application device 56 in which a plurality of nozzles (not shown) are arranged in the width direction of the crotch sheet member. A plurality of first adhesive application regions 30 and 31 having a predetermined application pattern can be simultaneously formed on the upper surface of the laminate 41 for sheet members, that is, the surface on the liquid-impermeable sheet side.
In addition, it is not always necessary to form the gap 39 between the other adjacent first adhesive application regions 30 and 31, and in this case, the other adjacent first adhesive application regions 30 and 31 are adjacent to each other. Are arranged adjacent to or in contact with each other, the first adhesive application regions 30 and 31 are disposed.

  And after forming the said 1st adhesion parts 26 and 27, the laminated body 41 for said crotch sheet members is cut | disconnected sequentially to predetermined length, and the individual crotch sheet member 2 is formed sequentially. . At this time, the first adhesive portions 26 and 27 are formed on both ends of the crotch sheet member 2, respectively.

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 28 and 29 is performed.
In this step S4, hot melt adhesive or the like is applied to the upper surface of the composite member 50 for the stomach side sheet member and the composite member 51 for the back side sheet member that has been conveyed, that is, the nonwoven fabric 52 for the inner surface side sheet. The second adhesive portions 28 and 29 are formed by applying the various adhesives.
In forming the second adhesive portions 28 and 29, the individual abdominal sheet member 3 and the back sheet member are separated from the composite member 50 for the ventral 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. Then, second adhesive application regions 33 and 34 that are continuous in the length direction (that is, the conveying direction) of the composite member 50 for the ventral sheet member and the composite member 51 for the back sheet member are provided.
In forming the second adhesive portions 28 and 29, for example, the plurality of nozzles (not shown) are provided for the composite member 50 for the abdomen seat member and the composite member 51 for the back seat member. A plurality of second adhesive application regions 33 and 34 are simultaneously formed by applying the adhesive in a predetermined application pattern by the adhesive application devices 57 and 58 arranged in the width direction.

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.
In this step S5, the first adhesive portion 26, the composite member 50 for the abdomen sheet member and the composite member 51 for the back sheet member in which the second adhesive portions 28, 29 are formed, respectively. In the crotch sheet member 2 formed with 27, both end portions of the liquid-impermeable sheet 12 are brought into contact with each other, and the first adhesive portions 26 and 27 and the second adhesive portions 28 and 29 are brought into close contact with each other. Let
Thereby, the 1st adhesive application area | regions 30 and 31 in the said 1st adhesion parts 26 and 27 and the 2nd adhesive application area | regions 33 and 34 in the said 2nd adhesion parts 28 and 29 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 seat member and the composite member 51 for the back seat member are conveyed in a state where a certain distance is maintained, and the crotch seat member 2 is in the length direction thereof. However, they are disposed along the composite member 50 for the abdominal 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. As a result, the first adhesive application areas 30 and 31 and the second adhesive application areas 33 and 34 are in close contact with each other, and the adhesives in the first adhesive application areas 30 and 31 The adhesives in the second adhesive application areas 33 and 34 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 26 and 27 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.
When the liquid-impermeable sheet 12 of the crotch sheet member 2 is brought into contact with the composite member 50 for the ventral sheet member and the composite member 51 for the dorsal sheet member, these crotch sheet members 2 and the composite member 50 for the abdomen seat member and the composite member 51 for the back seat member are preferably brought into pressure contact with each other with an appropriate force, whereby the adhesive in the first adhesive application regions 30 and 31 and the first The integration of the adhesives in the adhesive application areas 33 and 34 of No. 2 progresses, and the mutual bonding becomes stronger.

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.
This step S6 is convex toward the shape of the predetermined edge portion 9a of the butt covering portion 9 in the disposable diaper 1 as a product, that is, 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 (leg cut) so as to conform to the protruding shape.
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 abdomen seat member and the composite member for the back seat member, the crotch sheet member 2 is bent to join the crotch sheet member 2 to each other. The compound member 50 for the ventral sheet member and the compound member 51 for the back sheet member 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, the overlapped composite member 50 for the abdominal sheet member and the composite member 51 for the back side sheet member are set to a predetermined length in the length direction of the abdominal side sheet member 3 and the back side sheet member 4. In order to meet the requirements, 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, in the complete three-piece type disposable diaper, the first elastic member 23 of the base portion 8 of the back-side sheet member 4 and the edge of the collar covering portion 9 are used. The second elastic member 24 provided along the portion 9a and a part of each axial end portion located on the end portion side in the length direction of the back seat member 4 intersect each other. It is fixed in the state.
Thus, when the back side seat member 4 is pulled in the length direction of the back side seat member 4 by expanding the waist opening 1a of the disposable diaper 1 when worn, the first elastic member 23 is Pulled in the length direction, the second elastic member 24 intersecting with the first elastic member 23 is pulled up, and the collar cover 9 is pulled up and joined to the collar cover 9. The crotch sheet member 2 is pulled upward.
As a result, even if a downward force acts on the crotch sheet member 2 due to friction between the wearer's thigh and the edge portions of the leg opening 1b, 1b, the crotch sheet member 2 The crotch sheet member 2 can be fitted by firmly pulling up to the wear site of the wearer.
In addition, the disposable diaper 1 is a complete three-piece type, and no frill is formed by an auxiliary sheet that is obstructive when worn like the incomplete three-piece type. There is no such thing that the wearer can wear the disposable diaper stably.

Further, even if the crotch sheet member 2 is pulled downward due to the increase in the weight of the absorbent body 13 due to the absorption and retention of excrement, the second elastic member 24 is not removed through the buttock covering portion 9. The crotch sheet member 2 is pulled upward.
In addition, the first elastic member 23 intersecting the second elastic member 24 applies a downward force acting on the second elastic member 24 in the axial direction of the first elastic member 23. In order to reduce the burden on the second elastic member 24 by dispersing, the crotch sheet member 2 can be pulled up more stably and the state can be maintained.
As a result, not only when the disposable diaper 1 is worn, but also after wearing, the state in which the crotch sheet member 2 is fitted to the wearer can be stably maintained, so that the feeling of use can be kept good. It becomes possible.

In the said embodiment, the said collar part coating | coated part 9 is the structure by which three 2nd elastic members 24 (24a-24c) extended continuously over the full length of the length direction of this collar part coating | coated part 9 were arrange | positioned. It has become.
However, as shown in FIG. 10, it is good also as a structure which has the discontinuous part in which the 2nd elastic member is discontinuous in a part of the part in which the said absorber is located in the said crotch sheet | seat member.
In the case of the disposable diaper 60 shown in FIG. 10, a total of six second elastic members 61 are provided on the buttock cover portion 9 of the back side sheet member 2, three on each side. Each of these second elastic members 61 extends from the left and right end portions of the back seat member 2 toward the center in the length direction of the buttock covering portion 9, and The crotch sheet member 2 has a mode that reaches a position corresponding to a portion where the absorber 13 is located. At this time, the three second elastic members 60 located on the left side and the three second elastic members 61 located on the right side are not in contact with each other. Thereby, the area | region where any 2nd elastic member 61 does not exist is formed in the center side of the length direction of the said collar part coating | covering part 9, This part and the discontinuous part 62 of a 2nd elastic member are formed. It has become.
The disposable diaper 60 shown in FIG. 10 is the same as the embodiment described above except for the second elastic member 61, and therefore, the same reference numerals are given and detailed description thereof is omitted.

As described above, the second elastic member 61 is discontinuous in a part of the crotch sheet member 2 where the absorber 13 is located in the buttock covering portion 9 of the back sheet member 4. By providing a certain discontinuous portion, the crotch sheet member 2 is more reliably suppressed from being compressed in the width direction of the crotch sheet member 2 by the elastic force of the second elastic member 61. It is done.
Thereby, since the compression of the absorber 13 is further suppressed, it is possible to stably suppress a decrease in the absorption performance of the absorber 13 due to the compression and a decrease in the excretion receiving area on the liquid-permeable sheet side of the absorber 13. be able to.

In the above-described embodiment, the base portion 8 of the back seat member 4 is provided with a plurality of the first elastic members 23. At least one first elastic member is provided. Any number can be provided. Further, as in the above-described embodiment, the number of elastic members 18 provided on the ventral sheet member 3 is not necessarily the same.
Furthermore, in the said embodiment, although the three 2nd elastic members 24 (24a-24c) are provided in the said collar cover part 9, this 2nd elastic member is provided at least one. 2 or 4 or more can be provided, and an arbitrary number can be set.
In the embodiment, any one of the three second elastic members 24 provided on the flange covering portion 9 intersects the plurality of first elastic members 23 provided on the base portion 8. However, in the case where a plurality of the second elastic members are provided, it is sufficient that at least one of them intersects with at least one of the elastic members.
Note that the number of the first elastic member and the second elastic member can be arbitrarily set, and when a plurality of second elastic members are provided, at least one of them is the first elastic member. About the point which should just cross | intersect, it is the same also in the case of the disposable diaper 60 of the structure shown in the said FIG.

Moreover, in the said embodiment, among the said 1st adhesion parts 26 and 27, the 1st adhesion part 27 located in the edge part side joined to the said back side sheet member 4 is the said back side sheet member. 4 extends to the center side in the length direction of the liquid-impermeable sheet 12 up to a position overlapping the portion where the second elastic member 24 of the collar covering portion 9 is located.
However, about the 1st adhesion part located in the end side joined with the back side sheet member, it is not necessarily in the position which overlaps with the part where the 2nd elastic member of the buttock covering part in the back side sheet member is located. It does not need to be extended, and can be set to an arbitrary length within a range where the joining can be reliably performed.

  In the embodiment described above, the crotch sheet member 2 has a pair of leak-proof walls 14, 14. It is not always necessary to provide a leakage barrier. Further, when the pair of leak-proof walls is provided, the pair of leak-proof walls and the portion where the second elastic member in the buttock covering portion of the back seat member is not necessarily provided. There is no need for non-bonding to each other, and bonding may be performed by various means such as an adhesive as necessary.

In the above-described embodiment, the crotch sheet member 2 is disposed at both end portions in the width direction in the portion where the abdomen sheet member 3 and the back sheet member 4 are overlapped with each other. Non-joining regions 36, 36, 37, and 37 that are not joined to the back sheet member 4 are provided.
However, when providing this non-joining area | region, it should just be provided in the part with which the crotch part sheet | seat member and the back | dorsal sheet | seat member were piled up at least. Or you may abbreviate | omit about the said non-joining area | region.
In the embodiment, the non-joining regions 36, 36, 37, and 37 are formed so that the inner side in the width direction of the crotch sheet member 2 in the non-joining regions 36, 36, 37, and 37 It extends to the part corresponding to the position which entered the inner side of the width direction of this absorber 13 rather than the both ends of the width direction. However, the range of the non-bonded region can be formed in an arbitrary range in consideration of the width of the crotch sheet member, the shape of the absorbent body, the ranges of the first and second adhesive portions, and the like.

In the embodiment, the second elastic member 24 has a crotch rather than a portion (first portion) joined to the crotch sheet member 2 in the buttock covering portion 9 of the back sheet member 4. The portion (second portion) that is not joined to the part sheet member 2 is fixed to the edge portion 9a of the flange covering portion 9 in a contracted state.
However, the second elastic member does not necessarily have to be fixed to the edge portion of the buttock covering portion in a state in which the heel covering member necessarily has a difference in the contraction state between the first portion and the second portion. Absent.

In the embodiment, the first adhesive portions 26 and 27 are respectively provided on both end sides in the length direction of the crotch sheet member 2, and the second adhesive portions 28 and 29 are provided in the length direction. The crotch sheet member 2 is provided on the abdominal sheet member 3 and the back sheet member 4, respectively, and these first adhesive portions 26 and 27 and second adhesive portions 28 and 29 are adhered to each other. And the ventral sheet member 3 and the dorsal sheet member 4 are joined to each other.
However, the crotch sheet member, the abdominal sheet member, and the back sheet member need not be joined by providing the first adhesive portion and the second adhesive portion as in the above-described embodiment. May be joined.

In the embodiment, a part of the plurality of elastic members 18 disposed on the ventral sheet member 3 and the plurality of first elastic members 23 disposed on the base portion 8 of the back sheet member 4. Are disposed at positions corresponding to the second adhesive portions 28 and 29 provided on the abdominal sheet member 3 and the back sheet member 4, respectively.
However, the first elastic member disposed on the base member of the ventral sheet member and the back sheet member is not necessarily disposed at a position corresponding to the second adhesive portion. In addition, also when the 1st adhesion part is arranged in the abdominal sheet member and back side sheet member, the elastic member and back side of the abdominal side sheet member are in the position corresponding to the 1st adhesion part. It is not always necessary to dispose the first elastic member disposed on the base portion of the sheet member.
However, in order to more effectively prevent the crotch sheet member from sagging or dropping, at least one of the elastic member of the abdominal sheet member and the first elastic member disposed on the base portion of the back sheet member is used. Of course, it is preferable to arrange the portions at positions corresponding to the first adhesive portion or the second adhesive portion respectively provided on the ventral sheet member and the back sheet member.

In the above-described embodiment, the first elastic member 23 and the second elastic member 24 are configured such that a part of each axial end portion of each of the ventral seat member 3 and the back seat member 4 is the same. Crossing at the position near the joint 5 where the abdomen sheet member 3 and the back sheet member 4 are joined (near the joint 5) formed at both ends in the length direction, and intersecting It is the structure fixed in the nearest junction part 5 with the state left.
However, in the first elastic member and the second elastic member, a part of each axial end portion located on the end portion side in the length direction of the back seat member intersects each other. As long as it is fixed in a state, it may be crossed and fixed at a position other than the joint.

DESCRIPTION OF SYMBOLS 1,60 Disposable diaper 2 Crotch part sheet | seat member 3 Abdominal sheet | seat member 4 Back | dorsal sheet | seat member 8 Base | substrate part 9 Buttocks cover part 11 Liquid permeable sheet 12 Liquid impervious sheet 13 Absorber 14 Leakage barrier 23 Member 24, 61 2nd elastic member 26, 27 1st adhesion part 28, 29 2nd adhesion part 36, 37 Non-joining area 62 Non-continuous part

Claims (7)

A liquid-permeable sheet, a liquid-impermeable sheet disposed on one surface side of the liquid-permeable sheet, and an absorber disposed between the liquid-permeable sheet and the liquid-impermeable sheet, A crotch sheet member that is long in one direction covering the wearer's crotch, and is joined to the liquid-impermeable sheet in a state of being overlapped with the crotch sheet member on one end side in the length direction of the crotch sheet member. An abdominal sheet member covering the abdomen side of the wearer, which is long in a direction orthogonal to the length direction of the crotch sheet member; and the crotch on the other end side in the length direction of the crotch sheet member. A wearer as a separate member from the ventral sheet member, which is joined to the liquid-impermeable sheet in a state of being overlapped with the part sheet member and formed long in a direction orthogonal to the length direction of the crotch sheet member A dorsal sheet member covering the dorsal side of the ventral sheet The wood and the back side sheet member, a disposable diaper that are joined to each other at joint portions provided at both ends of each of the longitudinal direction of these ventral sheet member and the dorsal sheet member,
The dorsal seat member is disposed on a base portion that covers the waist of the wearer, joined to the ventral seat member, and at a position closer to the crotch seat member than the base portion. A buttock covering portion covering the wearer's buttocks, wherein the end portion on the crotch sheet member side in the width direction of the member protrudes toward the center side in the length direction of the crotch sheet member; The base portion and the buttock covering portion are joined to the crotch sheet member,
The base portion includes at least one first elastic member that extends in the length direction of the back seat member and is elastically stretchable in the axial direction.
The buttock covering portion is disposed at an edge portion of the buttock covering portion on the center side in the length direction of the crotch sheet member so as to be along the edge portion, and is at least elastically stretchable in the axial direction. Comprising one second elastic member,
The first elastic member and the second elastic member are in a state where a part of each axial end portion located on the end portion side in the length direction of the back seat member intersects each other. in have been fixed,
Further, the crotch sheet member is provided with first adhesive placement regions that are continuous in the length direction of the crotch sheet member on both ends in the length direction of the crotch sheet member. The abdomen-side sheet member and the back-side sheet member are each provided with a second adhesive arrangement region that is continuous in the width direction of the crotch sheet member at a position where it comes into contact with the crotch sheet member. And
The crotch sheet member and the ventral sheet member, and the crotch sheet member and the back sheet member are in a state in which the first adhesive placement region and the second adhesive placement region intersect each other. , that have been joined together, respectively, disposable diapers.   In the crotch sheet member, the absorbent body is formed longer in the direction along the length direction of the crotch sheet member, and the width of the crotch sheet member is larger than the positions of both end portions in the width direction of the absorbent body. A pair of leak-proof walls located on the outer side in the direction and extending in the length direction of the crotch seat member, and the pair of leak-proof walls and the buttock covering portion of the back seat member The disposable diaper according to claim 1, wherein the second elastic member is not joined to a portion where the second elastic member is disposed.   The said crotch part sheet | seat member has the non-joining area | region which is not joined to this back | dorsal sheet | seat member in the part overlapped with the said back | dorsal sheet | seat member in the both ends part side of the width direction, respectively. The disposable diaper according to 2.   The non-joint region of the crotch sheet member is a position where the inner side in the width direction of the crotch sheet member in the non-joint region enters the inner side in the width direction of the absorbent body than both ends in the width direction of the absorbent body. The disposable diaper according to claim 3, which extends to a portion corresponding to.   The buttock covering portion of the back seat member has a discontinuous portion where the second elastic member is discontinuous in a portion of the crotch seat member where the absorber is located. The disposable diaper of any one of Claims 1-4.   The second elastic member is in a state in which a portion not joined to the crotch seat member is contracted rather than a portion joined to the crotch seat member in the buttock covering portion of the back sheet member, The disposable diaper of any one of Claims 1-5 currently fixed to the edge part of the center side of the length direction of the said crotch part sheet | seat member in the said collar part coating | coated part.   The first elastic member and the second elastic member are fixed in a state where a part of each axial end portion crosses each other at the joint portion. The disposable diaper of any one of Claims.

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