JP2013000304A - Disposable diaper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a disposable diaper having excellent flexibility, cushion property, air permeability and dehumidification property in a part where a stretchable material is arranged, while being easily manufactured and effectively preventing leaking of excrement from the part where the stretchable material is arranged.SOLUTION: The disposable diaper 1 includes front and rear cover portions for covering a waist of a wearer, and a crotch cover portion for covering a crotch of the wearer. Also, stretchable sections 80 has stretchable nonwoven cloth formed at the portion such as the rear cover portion, and the stretchable section 80 is formed to stretch/contract in the direction along the waist. Further, a cell forming sheet 82 comprising nonwoven cloth is disposed in a part of the skin-contact surface on the portion where the stretchable section 80 is formed, while a joint part 84 is formed for joining the cell forming sheet 82 and the stretchable section 80. By the joint part 84, cells 86 extending in the cross direction for intersecting the direction the stretchable section 80 stretches/contracts are defined and formed between the layers of the cell forming sheet 82 and the stretchable section 80. The one end of the cell 86 is open and the other end is closed, and thus, the cell 86 does not pass through.

Description

  The present invention relates to a disposable diaper.

  The disposable diaper is an absorbent article that is worn so as to wrap around the waist of the wearer, and includes an absorbent body for absorbing and holding excrement.

  In the disposable diaper as described above, it extends along the waist edge of the portion enveloping the waist or along the side edge of the portion enveloping the crotch (for example, along the periphery of the leg opening). Fixing the stretchable material in a state is performed. This stretchable material is fixed for the purpose of improving the feeling of wearing and fitting and preventing the excrement from leaking from the waist opening or the leg opening.

  However, simply fixing the stretchable stretchable material can impart stretchability to the stretchable material fixing portion, but the flexibility, cushioning properties, and the like may be insufficient. For example, 1) Tightening with an elastic material is too strong, and rubber marks (timer marks) are attached to the wearer's skin. 2) The elastic material fixing part tends to become hard due to application of adhesive or thermal fusion of the elastic material. Therefore, the flexibility and feel of the diaper are impaired. 3) When the waist opening or leg opening periphery is hard, the wearer's own skin as well as the fingers of the person performing the replacement work are damaged. There was a problem that there was.

  Therefore, in the disposable diaper, various proposals have been made to improve flexibility, cushioning properties, etc. while imparting stretchability to the stretchable material fixing portion. For example, an outer layer sheet, an inner layer sheet and a plurality of elastic members form an outer packaging material of an absorbent article, and the outer layer sheet and the inner layer sheet are intermittently formed in the waist circumference direction and the orthogonal direction thereof. Pants-type absorbent articles are proposed that are arranged in the waist circumference direction so that the elastic member does not pass through the joining portion while being joined to each other (see Patent Documents 1 to 5).

  In this pant-type absorbent article, the elastic member is configured not to be fixed to the outer layer sheet and the inner layer sheet. Therefore, when the elastic member contracts, the outer layer sheet and the inner layer sheet are bent so as to be separated from each other, and a plurality of ridges extending from the outer end portion of the waist portion to the inner end portion are formed on the entire circumference of the waist portion. (Unevenness) is formed.

JP 2008-136793 A JP 2008-136794 A JP 2008-142316 A JP 2008-142341 A JP 2008-142342 A

  The pants-type absorbent articles described in Patent Documents 1 to 5 have a volume in the stacking direction of the outer layer sheet and the inner layer sheet by the protrusions of the heel, and improve the flexibility, cushioning properties, etc. of the stretchable material arrangement portion. It is thought that he was planning.

  However, in the structures described in Patent Documents 1 to 5, since the outer layer sheet and the inner layer sheet are coupled in both the waist circumference direction and the orthogonal direction, the movement of the outer layer sheet and the inner layer sheet is restricted. Even when the elastic member contracts, the outer layer sheet and the inner layer sheet are difficult to bend. Therefore, it is difficult to form high convex portions, and the improvement effect of flexibility and cushioning properties is poor.

  Moreover, in the said structure, the air and moisture inside a diaper are discharged | emitted outside the diaper through the recessed part of a bag, and improvement of air permeability and dehumidification can be anticipated. However, there is a problem in that the moisture condenses on the concave surface of the heel and moisture adheres to the wearer's skin. If the stretchable part is rubbed against the skin that is soft with moisture, it causes skin troubles, which is not preferable.

  There is a possibility that a part of the air or moisture inside the diaper passes through the inner sheet without passing through the concave part of the bag and flows into the space formed between the convex part of the outer layer sheet and the convex part of the inner layer sheet There is also. However, since this space is a closed space without an opening, air and moisture tend to stay in the closed space. Therefore, it is thought that ventilation and dehumidification do not proceed easily.

  Moreover, the said structure is a special structure by which the elastic member was distribute | arranged so that it might not pass through the intermittent junction part of an outer layer sheet | seat and an inner layer sheet | seat. In this structure, the elastic member is not restricted by either the outer layer sheet or the inner layer sheet, and can be freely extended. For example, even when the elastic member is disposed at a stretch rate of 300% at the time of manufacture, the elastic member may stretch locally exceeding the stretch rate of 300% at the time of use. That is, the elastic member may extend excessively beyond an ideal expansion rate. Therefore, there is a problem that the elastic member that is tightly stretched may come into contact with the skin through the inner layer sheet to cause pain and discomfort.

  Furthermore, in order to obtain the special structure described above, a precise joining technique is required at the time of manufacture, and there is a problem that the manufacture is difficult.

  The present invention has been made in view of the problems of the prior art as described above. That is, it has excellent flexibility, cushioning properties, breathability, and dehumidifying properties of the stretchable material placement portions such as the waist end portion of the waist envelopment portion and the side edge portion of the crotch envelopment portion (for example, the peripheral edge portion of the leg opening) Disclosed is a disposable diaper that can be easily manufactured and can effectively prevent leakage of excrement in an elastic material arrangement portion.

  As a result of intensive studies to solve the problems of the prior art as described above, the present inventor 1) arranges a cell-forming sheet made of a nonwoven fabric on a part of the skin contact surface in the portion where the stretchable portion is formed. 2) A joining portion that joins the cell forming sheet and the stretchable portion is formed, and cells extending in the crossing direction intersecting the shrinking direction of the stretchable portion are defined between the cell forming sheet and the stretchable portion by the joining portion. 3) The present invention has been completed by conceiving that the above-mentioned problems can be solved by forming a non-penetrating cell having one end opened and the other end closed. Specifically, the following disposable diapers are provided by the present invention.

[1] A front enveloping part and a rear enveloping part that enclose the circumference of the wearer's torso, and an inseam enveloping part in which an absorber is arranged and encapsulates the wearer's inseam, A stretchable portion made of a stretchable nonwoven fabric is formed on at least one portion of the waist portion, the back-wrapped portion, and the crotch-wrapped portion, and the stretchable portion extends in the direction along the waist and the crotch-wrapped portion. It is formed so as to shrink in at least one of the directions along the side edge, and a cell-forming sheet made of a nonwoven fabric is disposed on a part of the skin contact surface in the portion where the stretchable part is formed, A joining portion that joins the cell forming sheet and the stretchable portion is formed, and cells that extend in an intersecting direction intersecting a shrinking direction of the stretchable portion are defined between the cell forming sheet and the stretchable portion by the joining portion. Formed, the cell is open at one end and closed at the other end. Disposable diapers are non-through of cells.

[2] As the cell, an outward cell in which an end portion closer to the outer space of the diaper is opened and an end portion far from the outer space of the diaper is closed by the joining portion, and a farther side from the outer space of the diaper The disposable diaper according to [1], wherein an inward cell in which an end portion of the diaper is opened and an end portion closer to the outer space of the diaper is closed by the joint portion is formed.

[3] A cell row in which a plurality of cells are arranged in parallel in the contraction direction is formed, and the cell row is formed by alternately arranging the outward cells and the inward cells. ] The disposable diaper as described in.

[4] The joint is a zigzag or wavy joint continuous in the contraction direction, and the outward cells and the inward cells are alternately partitioned by the joint. [3] Disposable diapers described in 1.

[5] A cell row in which a plurality of cells are arranged in parallel in the shrinking direction is formed, and the cell row is arranged in a plurality of stages in the intersecting direction to form cells in one cell row. A portion extending in the intersecting direction of the joining portion to be arranged and a portion extending in the intersecting direction of the joining portion forming a cell in the cell row adjacent to the one cell row are not arranged on a straight line. The disposable diaper according to any one of [1] to [4], wherein the plurality of cell rows are arranged.

[6] The plurality of cells such that an extension line of a portion extending in the intersecting direction among the joints forming the cells in one cell row passes through the cells in the cell row adjacent to the one cell row. The disposable diaper according to [5], wherein the rows are arranged.

  The disposable diaper of the present invention has flexibility, cushioning properties, breathability, and the like of elastic material arrangement portions such as the waist end portion of the waist-wrapped portion and the side edge portion of the crotch-wrapped portion (for example, the peripheral edge portion of the leg opening). It has excellent dehumidifying properties and can be easily manufactured. Moreover, the leakage of excrement in the elastic material arrangement part can be effectively prevented.

It is a front view showing typically one embodiment of the disposable diaper of the present invention. It is an outline top view showing typically the state where the disposable diaper shown in Drawing 1A was developed and it looked from the top sheet direction. It is a schematic end view which shows typically the A-A 'cutting | disconnection end surface of the disposable diaper shown to FIG. 1B. It is a schematic end view which shows typically the B-B 'cut end surface of the disposable diaper shown in FIG. 1B. It is a schematic plan view which shows typically the state which developed the disposable diaper shown in Drawing 1A, and was seen from the outer sheet direction. It is a perspective view which shows typically the expansion-contraction part vicinity of the disposable diaper shown to FIG. 1A. It is a schematic end view which shows typically the X-X 'cut end surface of the disposable diaper shown to FIG. 1F. It is the schematic plan view which expands the form of the junction part of the disposable diaper shown to FIG. 1B, and shows the state seen from the top sheet direction. It is a schematic end view schematically showing an X-X ′ cut end surface of the disposable diaper shown in FIG. 2A. FIG. 2B is a schematic end view schematically showing a Y-Y ′ cut end surface of the disposable diaper shown in FIG. 2A. It is a schematic plan view which expands the form of the junction part of the disposable diaper of this invention, and shows typically the state seen from the top sheet direction. FIG. 3B is a schematic end view schematically showing a Y-Y ′ cut end surface of the disposable diaper shown in FIG. 3A. It is a schematic plan view which expands another form of the junction part of the disposable diaper of this invention, and shows typically the state seen from the top sheet direction. FIG. 4B is a schematic end view schematically showing an X-X ′ cut end surface of the disposable diaper shown in FIG. 4A. FIG. 4B is a schematic end view schematically showing a Y-Y ′ cut end surface of the disposable diaper shown in FIG. 4A. It is a schematic plan view which expands another form of the junction part of the disposable diaper of this invention, and shows typically the state seen from the top sheet direction. FIG. 5B is a schematic end view schematically showing an X-X ′ cut end surface of the disposable diaper shown in FIG. 5A. It is a schematic plan view which expands still another form of the junction part of the disposable diaper of this invention, and shows typically the state seen from the top sheet direction. FIG. 6B is a schematic end view schematically showing an X-X ′ cut end surface of the disposable diaper shown in FIG. 6A. FIG. 6B is a schematic end view schematically showing a Y-Y ′ cut end surface of the disposable diaper shown in FIG. 6A. It is a schematic plan view which expands another form of the junction part of the disposable diaper of this invention, and shows typically the state seen from the top sheet direction. FIG. 7B is a schematic end view schematically showing an X-X ′ cut end surface of the disposable diaper shown in FIG. 7A. FIG. 7B is a schematic end view schematically showing a Y-Y ′ cut end surface of the disposable diaper shown in FIG. 7A. It is a schematic plan view which expands another form of the junction part of the disposable diaper of this invention, and shows typically the state seen from the top sheet direction. FIG. 8B is a schematic end view schematically showing an X-X ′ cut end surface of the disposable diaper shown in FIG. 8A. FIG. 8B is a schematic end view schematically showing a Y-Y ′ cut end surface of the disposable diaper shown in FIG. 8A. It is a schematic plan view which expands still another form of the junction part of the disposable diaper of this invention, and shows typically the state seen from the top sheet direction. It is a figure which shows the modification of the disposable diaper shown to FIG. 8A, and is a schematic end elevation which shows typically the end surface corresponded to the X-X 'cutting | disconnection end surface of FIG. 8A. It is a figure which shows another modification of the disposable diaper shown to FIG. 8A, and is a schematic end elevation which shows typically the end surface corresponded to the X-X 'cut end surface of FIG. 8A. It is a schematic process figure which shows typically the manufacturing process of the disposable diaper shown to FIG. 1A, and shows each process seen from the inner sheet | seat direction. 11A is a schematic end view schematically showing a cut end surface cut at the center in the width direction of the structural unit shown in FIG. 11A in each step shown in FIG. 11A. It is a perspective view showing typically another embodiment of the disposable diaper of the present invention. It is a partially notched schematic plan view which expand | deploys the disposable diaper shown to FIG. 12A, and shows the state seen from the top sheet direction. FIG. 12B is a schematic end view schematically showing an A-A ′ cut end surface of the disposable diaper shown in FIG. 12B. FIG. 12B is a schematic end view schematically showing a B-B ′ cut end surface of the disposable diaper shown in FIG. 12B. It is a schematic plan view which shows typically the state which developed the disposable diaper shown in Drawing 12A, and was seen from the outer sheet direction. FIG. 12B is a schematic end view schematically showing an A-A ′ cut end face of the disposable diaper shown in FIG. 12B in use. It is a schematic plan view which shows typically another embodiment of the disposable diaper of this invention. FIG. 13B is a schematic end view schematically showing an A-A ′ cut end surface of the disposable diaper shown in FIG. 13A. FIG. 13B is a schematic end view schematically showing a B-B ′ cut end surface of the disposable diaper shown in FIG. 13A. It is a schematic back view of the disposable diaper shown to FIG. 13A. It is a schematic plan view which shows typically the elastic nonwoven fabric which is a structural member of the disposable diaper shown to FIG. 13A. FIG. 14B is a schematic end view schematically showing an A-A ′ cut end surface of the stretchable nonwoven fabric shown in FIG. 14A. FIG. 14B is a schematic end view schematically showing a B-B ′ cut end face of the stretchable nonwoven fabric shown in FIG. 14A.

  Hereinafter, the form for implementing the disposable diaper of this invention is demonstrated concretely.

[1] Basic configuration of the disposable diaper of the present invention:
The disposable diaper according to the present invention includes, as in the disposable diaper 1 shown in FIGS. 1A, 1B, and 1D, a front enveloping part 2 and a rear enveloping part 6 that enclose the circumference of the wearer, and an absorbent body 22. The crotch enveloping part 4 which is arrange | positioned and encapsulates a wearer's inseam is included.

[1-1] Disposable diapers:
The “disposable diaper” includes various forms such as a pants type and a tape type. However, the present invention broadly includes disposable diapers having the specific items, and is not limited to the pants type, the tape type and the like shown below.

[1-2] Front enveloping part and rear enveloping part:
The “front enveloping part” and the “rear enveloping part” are parts of the disposable diaper that encapsulate around the wearer's torso.

  In this specification, in the case where the absorber is continuously arranged from the crotch envelopment portion to the front envelopment portion and the rear envelopment portion, the end of the absorber in the front encapsulation portion and the rear encapsulation portion A portion on the side of the waist edge from the edge and an extension line of the end edge is referred to as a “waist enveloping portion”, and a portion on the crotch side from the edge of the absorber and the extension line of the end edge is referred to as a “tammy encapsulation portion”. To.

  “Envelop around the torso” means a form in which a cylindrical structure surrounding the wearer's torso is formed by a part of the disposable diaper or a form in which the cylindrical structure can be formed. An example of a diaper having a “tubular structure” is a pants-type disposable diaper.

  The “pants-type” refers to a disposable diaper having a pant-type shape in which one waist opening 10 and a pair of left and right leg openings 12 are formed in advance, like the disposable diaper 1 shown in FIG. 1A.

  The disposable diaper 1 shown in FIGS. 1A, 1B, and 1E is a cylinder that surrounds the wearer's torso by joining the side edges 62a and 62b of the front exterior body 62 and the side edges 65a and 65b of the rear exterior body 65 to each other. This is a form in which a shape structure is formed. In such a form, the cylindrical structure is formed by the region between the left and right joints 7 and 8 in the exterior body 16. Therefore, the region will be referred to as the front encapsulation part 2 or the rear encapsulation part 6.

  As for the disposable diaper 1 shown to FIG. 1A, FIG. 1B, and FIG. 1E, the exterior body 16 is comprised from the front exterior body 62 and the back exterior body 65. FIG. However, it is also one form of the “pants type” that the exterior body is not separated into front and rear but is integrally formed and has one waist opening and a pair of left and right leg openings formed in advance.

  For example, in the disposable diaper 201 shown in FIGS. 12A, 12B and 12E, the side edges 202a and 202b and the side edges 206a and 206b of the integrally formed exterior body 216 are joined to each other so that the wearer's torso It is the form in which the surrounding cylindrical structure was formed. In such a form, the cylindrical structure is formed by the region between the left and right joints 207 and 208 in the exterior body 216. Therefore, the region is referred to as the front enveloping part 202 or the rear encapsulating part 206.

  As a diaper “a form in which a tubular structure can be formed”, a pseudo-pants-type or tape-type disposable diaper can be mentioned.

  “Pseudo-pants” refers to the joints 7 and 8 or the joint 207 in the same form as the disposable diaper 1 shown in FIGS. 1A, 1B and 1E or the disposable diaper 201 shown in FIGS. 12A, 12B and 12E. , 208 refers to a disposable diaper having a removable fastener (such as a mechanical fastener).

  In such a “pseudo-pants type”, a portion covering the wearer's front side and a portion covering the rear side of the exterior body can be detachably engaged at both side edges by the engaging force of the fastener. Therefore, a cylindrical structure surrounding the wearer's torso can be formed. In the “pseudo pants type”, the cylindrical structure is formed by the region between the fasteners on the left and right side edges of the exterior body. Therefore, the region will be referred to as a front encapsulation portion or a rear encapsulation portion.

  As in the disposable diaper 301 shown in FIGS. 13A and 13D, the “tape type” includes left and right side edges of a portion covering the back side of the wearer (in the illustrated example, side edges 374 a, The disposable diaper which the fastening tape 311 was attached so that it might extend from 374b) may be pointed out.

  As shown in FIGS. 13A and 13D, the “tape type” includes a fastening member (in the illustrated example, a hook material 348 of a mechanical fastener) on a base material 350 constituting the fastening tape 311. Therefore, the fastening member (the loop material 346 of the mechanical fastener that forms the front patch 313 in the illustrated example) is fastened to the portion of the fastening member that encloses the front side of the wearer, thereby forming a cylindrical structure that surrounds the wearer's torso. be able to.

  The “tape type” does not have a cylindrical structure formed in advance like the “pants type”. Therefore, the “front enveloping part” and the “rear enveloping part” in the “tape type” are diaper main bodies constituted by an absorbent body and a sheet material (top sheet, back sheet, side sheet, etc.) for covering the absorbent body It is defined as follows according to the shape of.

  When the diaper body is formed in an hourglass shape (a shape with wide front and rear waist edges and a narrow constriction on the crotch side, a shape similar to the exterior body 216 shown in FIG. 12B), the waist end on the front side of the diaper A straight line connecting the constriction starting points on the edge side and a waist end edge on the front side of the diaper is a "front enveloping part", a straight line connecting the constriction starting points on the waist edge side on the back side of the diaper, and a diaper A region between the rear waist edge is referred to as a “rear envelope”.

  Like the disposable diaper 301 shown to FIG. 13A and FIG. 13D, while the rear side flap 374 separate from the diaper main body 370 is attached to the waist edge 370c side of the diaper main body 370, the waist edge 370d side is also attached. When the front side flap 372 is provided separately from the diaper main body 370, a straight line connecting the intersections of the front side flap 372 and the side edges 370a and 370b of the diaper main body 370 on the diaper crotch side, and the waist The area between the edge 370d is the "front envelope part", the straight line connecting the intersections of the rear side flap 374 and the side edges 370a, 370b of the diaper body 370 on the diaper crotch side, and the waist edge 370c This region will be referred to as a “rear envelope”.

  If the diaper body has only a rear side flap that is separate from the diaper body and no front side flap, the intersection of the rear side flap on the diaper crotch side and the side edge of the diaper body The area between the straight line connecting the waist and the edge of the waist is the `` back cover part '', and when the diaper body is folded so that the waist edges overlap each other, the area that overlaps the `` back cover part '' It will be referred to as a “pack”.

[1-3] Inseam enveloping part:
“Inseam enveloping part” refers to a part of the disposable diaper that encloses the inseam of the wearer. In other words, it is a portion between the front encapsulation portion and the rear encapsulation portion.

  An absorber for absorbing and holding excrement is disposed in the crotch envelope. It does not specifically limit about the structure of an absorber, The absorber used for a conventionally well-known absorbent article can be used. A specific configuration of the absorber will be described later.

  In the disposable diaper 1 shown in FIG. 1A, FIG. 1B, FIG. 1D and FIG. 1E, the absorbent main body 14 is arranged and joined so as to be bridged between the front exterior body 62 and the rear exterior body 65 ( Junction 28). In this embodiment, the front envelope part 2 is formed by the front exterior body 62, the rear envelope part 6 is formed by a part of the rear exterior body 65, and the crotch cover is formed by a part of the rear exterior body 65 and a part of the absorbent main body 14. A packet part 4 is formed. The absorber 22 is disposed as a constituent member of the absorbent main body 14.

  In the disposable diaper 201 shown in FIGS. 12A, 12B, 12D, and 12E, a crotch envelope portion 204 is formed by the absorbent main body 14 and the exterior body 216. An area between the straight line connecting the constriction starting points on the side of the waist edge 202c on the side edge of the exterior body 216 and the straight line connecting the constriction starting points on the side of the waist edge 206c is the crotch enveloping portion 204. .

  In the disposable diaper 301 shown in FIGS. 13A and 13D, a crotch envelope portion 304 is formed by the diaper main body 370. Then, a straight line connecting the intersections of the front side flap 372 and the side edges 370a and 370b of the diaper main body 370 on the crotch side of the diaper, and an intersection of the rear side flap 374 and the side edges 370a and 370b of the diaper main body 370 on the crotch side of the diaper. The area between the straight lines connecting each other is the crotch envelope portion 304.

[2] Characteristic configuration of the disposable diaper of the present invention:
In the disposable diaper of the present invention, like the disposable diaper 1 shown in FIG. 1B and FIG. 1D, a stretchable portion 80 made of a stretchable nonwoven fabric is formed on the back cover 6 and the stretchable portion 80 is along the waist. It is a disposable diaper formed so as to shrink. And 1) that the cell forming sheet 82 made of non-woven fabric is disposed on a part of the skin contact surface in the portion where the stretchable part 80 is formed, and 2) joining that joins the cell forming sheet 82 and the stretchable part 80. Part 84 is formed, and cells 86 extending in a crossing direction intersecting with the shrinking direction of the stretchable part 80 are partitioned and formed between the cell forming sheet 82 and the stretchable part 80 by the joining part 84, and 3) the cell 86 Is a non-penetrating cell having one end opened and the other end closed.

  In such a disposable diaper, as shown in FIGS. 1F and 1G, the distance between the cell forming sheet 82 and the joint portion 84 of the stretchable part 80 is also narrowed by the shrinkage of the stretchable part 80. As a result, the cell forming sheet 82 and the expansion / contraction part 80 are bent and deformed into a corrugated shape, and the cell forming sheet 82 and the expansion / contraction part 80 other than the joining part 84 (non-joining part) are separated from each other. A functioning cell 86 is formed.

  In the structure described above, moisture staying in the inner space of the diaper can be taken into the cell 86. Therefore, it is possible to prevent moisture from accumulating on the surface of the cell forming sheet 82 laminated on the stretchable portion 80 (skin contact surface immediately above the stretchable portion 80) and causing skin troubles. Moreover, since moisture hardly condenses on the skin contact surface directly above the stretchable part 80, the dry state of the skin contact surface can be maintained, and a comfortable wearing feeling can be obtained.

  Further, when the wearer moves (moving from a standing position to sitting, walking, etc.), the diaper is deformed, and the cell 86 is also deformed following the deformation. With the deformation of the cell 86, air and moisture in the inner space of the diaper are taken into the cell 86 and discharged. In particular, in the structure, one end of the cell 86 is opened as shown in FIGS. 1F and 2B, and the end of the cell forming sheet 82 in the opening is a free end. Therefore, the movement of the cell forming sheet 82 and the stretchable part 80 is not restricted in the opening, and the cell forming sheet 82 and the stretchable part 80 can be sufficiently bent. That is, the cell 86 can be greatly opened. Therefore, ventilation and dehumidification of the inner space of the diaper are promoted, and the inner space of the diaper can be made a comfortable environment.

  Furthermore, the cell exhibits a buffering function like an air cushion. Therefore, the skin contact is soft and the flexibility around the waist of the diaper can be improved. That is, the wearer can obtain a comfortable wearing feeling. In particular, in the said structure, since the cell formation sheet 82 and the expansion-contraction part 80 can be bent sufficiently, a high convex part can be formed with the cell formation sheet 82 and the expansion-contraction part 80. FIG. Accordingly, the cell 86 has a bulky structure, and the effect of filling the gap between the wearer's skin and the stretchable part 80 is high. That is, it is excellent in flexibility, cushioning properties, and leakage prevention effects.

  Furthermore, in the disposable diaper of the present invention, since the cell is a non-penetrating cell having one end opened and the other end closed, excrement does not leak through the cell. Moreover, the excrement which has flowed can also be captured in the cell. Therefore, the flexibility and breathability of the stretchable part can be improved while preventing the excrement from leaking.

[2-1] Expansion / contraction part:
The stretchable part is made of a stretchable nonwoven fabric. “Stretchable nonwoven fabric” is not only stretchable nonwoven fabric itself, but also stretched elastic material (elastic material such as rubber or thermoplastic elastomer) is fixed (bonded) to the nonwoven fabric used as the base material. Nonwoven fabrics imparted with properties are also included.

  As what a nonwoven fabric itself has a stretching property, a commercially available elastic nonwoven fabric, an elastomer spunbonded nonwoven fabric, etc. can be mentioned, for example. Specifically, Straflex (produced by Idemitsu Unitech Co., Ltd.), Espancione (produced by KB Seiren Co., Ltd.) and the like can be suitably used under the trade names below. These elastic nonwoven fabrics and elastomer spunbond nonwoven fabrics are stretchable by themselves.

  A non-woven fabric in which a stretchable stretchable material is fixed to the non-woven fabric and imparted with stretchability can be configured by appropriately combining and joining the non-woven fabric and the stretchable material. For example, in the disposable diaper 301 shown in FIGS. 13A and 13C, an elastic material 399 in an expanded state is disposed between a plurality of nonwoven fabric sheets 397 and 398 as shown in FIGS. 14A to 14C as a material constituting the elastic part 381. In addition, the stretchable material 399 is fixed to the plurality of nonwoven fabric sheets 397 and 398, and a stretchable nonwoven fabric in which the plurality of nonwoven fabric sheets 397 and 398 and the stretchable material 399 behave integrally is used. By using the stretchable nonwoven fabric in which the nonwoven fabric and the stretchable material behave integrally, the stretchable material does not extend beyond the sheet width unlike the pant-type absorbent articles of Patent Documents 1 to 5. In addition, the stretchable material is not excessively stretched beyond the ideal stretch rate.

  Generally, a disposable diaper has a structure in which a linear elastic material is disposed between layers of a nonwoven fabric. Therefore, it is not always necessary to provide an independent stretchable nonwoven fabric to configure the stretchable portion, and the stretchable portion may be configured using a part of the structure of a conventional disposable diaper as the stretchable nonwoven fabric.

  The disposable diaper 1 shown in FIG. 1D includes an interlayer between the folded portion 88 and the pressing sheet 68 of the outer sheet 63 that constitutes the front exterior body 62, and a folded portion 88 and the retaining sheet 68 of the outer sheet 66 that constitute the rear exterior body 65. The stretchable waist elastic material 42 is disposed between the layers. The waist elastic material 42 is fixed to the folded portion 88 and the pressing sheet 68. That is, a stretchable nonwoven fabric (stretchable portion 80) that behaves integrally is formed by the folded portion 88, the pressing sheet 68, and the waist stretchable material 42.

  In the disposable diaper 201 illustrated in FIG. 12C, the stretched three-dimensional gather stretchable material 36 is disposed between the base and the folded portion of the nonwoven fabric sheet 32 that forms the three-dimensional gather 26. The three-dimensional gather stretchable material 36 is fixed to the base portion and the folded portion of the nonwoven fabric sheet 32. That is, a stretchable nonwoven fabric (stretchable portion 280) that behaves integrally with the base portion, the folded portion, and the three-dimensional gather stretchable material 36 of the nonwoven fabric sheet 32 is configured.

  In the disposable diaper 301 shown in FIG. 13B, the stretchable leg stretchable material 340 is disposed between the side sheet 319 and the cover sheet 324 constituting the diaper main body 370. The leg elastic material 340 is fixed to the side sheet 319 and the cover sheet 324. That is, a stretchable nonwoven fabric (stretchable portion 380) that behaves integrally is configured by the side sheet 319, the cover sheet 324, and the leg stretchable material 340.

  The stretchable part is at least one of the front enveloping part, the rear enveloping part, and the crotch enveloping part, in at least one direction of the direction along the waist and the direction along the side edge of the crotch enveloping part. It is formed to shrink.

  For example, in the disposable diaper 1 shown in FIG. 1D, the stretchable part 80 is formed so as to shrink in a direction along the circumference of the trunk of the front exterior body 62 constituting the front envelope part 2. And the expansion / contraction part 80 is formed in the back exterior body 65 which comprises the back envelope part 6 so that it may shrink | contract in the direction along a trunk periphery. Moreover, the disposable diaper 201 shown to FIG. 12C has the expansion-contraction part 280 formed in the absorptive main body 14 which comprises a crotch envelope part so that it may shrink | contract in the direction along the side edge. Further, the disposable diaper 301 shown in FIG. 13C is arranged on the diaper main body 370 constituting the front enveloping part 302 and the rear enveloping part 306 in a direction along the periphery of the diaper (that is, a direction along the waist edge 370c, 370d). A stretchable portion 381 (stretchable nonwoven fabric 396) is formed so as to shrink.

  “Forming to shrink in the direction along the circumference of the trunk” means that the stretchable nonwoven fabric is arranged so that it can be stretched and contracted in the direction along the circumference of the diaper. As the simplest structure, like the disposable diaper 1 shown in FIG. 1E, the waist edge of the front envelope part 2 (in this example, the waist edge 62c of the front exterior body 62) or the waist edge of the rear envelope part 6 A configuration in which a linear elastic material (waist elastic material 42 in this example) is disposed along the edge (in this example, the waist edge 65c of the rear exterior body 65) can be given.

  “Forming to shrink in the direction along the side edge of the crotch envelope” means that the stretchable nonwoven fabric is arranged so that it can be stretched and contracted in the direction along the side edge of the crotch envelope Means that. As the simplest structure, like a disposable diaper 301 shown in FIGS. 13B and 13D, linear expansion and contraction is performed along the side edges of the crotch envelope portion 304 (in this example, the side edges 370a and 370b of the diaper main body 370). The structure which arrange | positions material (in this example leg elastic material 340) can be mentioned.

  However, the configuration is not limited to the above as long as the stretchable nonwoven fabric contracts in at least one of the direction along the waist and the direction along the side edge of the crotch envelope. For example, the elastic material may be arranged so as to draw a convex curve upward or downward with respect to the direction along the waist of the diaper, or left with respect to the direction along the side edge of the crotch envelope. An elastic material may be arranged so as to draw a convex or right convex curve.

  In the disposable diaper of this invention, the said expansion-contraction part should just be formed in the at least 1 part of the front covering part, the back covering part, and the crotch covering part. By joining the cell forming sheet to these portions, flexibility can be imparted while preventing leakage of excrement. That is, the formation part of the expansion / contraction part is not limited to the vicinity of the already described waist edge or the side edge of the crotch envelope.

  For example, the disposable diaper 201 shown in FIG. 12C has a linear elastic material (in this example, a three-dimensional gather expansion / contraction) at the upper end of the three-dimensional gather 26 provided along the side edge of the absorbent main body 14 constituting the crotch envelope portion 204. The material 36) is arranged, and the stretchable part 280 is formed. A cell forming sheet 282 is joined to the stretchable part 280.

  Moreover, as shown in FIG. 1B and FIG. 1E, when the tammy stretchable material 44 is arranged in the front enveloping part 2 or the rear wrapping part 6 and a tammy stretchable part is formed, a cell is placed in the tammy stretchable part. The forming sheet may be joined.

  Furthermore, like the disposable diaper 1 shown in FIG. 1A, FIG. 1B and FIG. 1E, the expansion / contraction part formed by the tammy expansion / contraction material 44 at the end part on the crotch enveloping part 4 side of the front enveloping part 2 and the inseam enveloping part An elastic part formed by the leg elastic material 38 or the three-dimensional gather elastic material 36 at the side edge part 4 and an elastic part formed by the leg elastic material 40 at the end of the crotch envelope part 4 on the rear envelope part 6 side In the case of continuous arrangement, it is preferable to join the cell forming sheet to these stretchable parts. Such a form can form a cell structure so as to surround the wearer's leg. Therefore, flexibility can be imparted around the leg opening while preventing leakage of excrement from the leg opening.

[2-2] Cell forming sheet:
As for the disposable diaper of this invention, the cell formation sheet 82 which consists of a water-repellent nonwoven fabric is arrange | positioned in a part of skin contact surface in the part in which the expansion-contraction part 80 was formed like the disposable diaper 1 shown to FIG. 1D and FIG. 1F. . The cell forming sheet 82 forms a cell structure that functions as a vent pipe and a cushion.

  The “skin contact surface” means a surface that directly contacts the wearer's skin when the disposable diaper is worn, that is, an innermost surface of the disposable diaper. As the “water-repellent nonwoven fabric”, the same material as the side sheet described later can be used. By using the water-repellent nonwoven fabric, it becomes difficult for leakage of excrement transmitted through the cell forming sheet to occur.

  “Partial” means that the cell forming sheet may not be disposed on the entire skin contact surface of the portion where the stretchable portion is formed. It does not specifically limit about the site | part which arrange | positions a cell formation sheet.

  However, as shown in FIG. 1D, it is preferable to arrange the cell forming sheet 82 in the vicinity of the waist edge of the rear envelope 6 (in this example, the waist edge 65c of the rear exterior body 65). The cell forming sheet 82 is preferably disposed in the vicinity of the second waist edge (in this example, the waist edge 62c of the front exterior body 62). Moreover, as shown in FIG. 13A, it is preferable to arrange the cell forming sheet 382 on the left and right side edges of the crotch envelope 4 (in the vicinity of the side edges 370a and 370b of the diaper main body 370 in this example). In any case, it is preferable to arrange so as to cover 60% or more of the side edge of the waist edge or crotch envelope, and to cover the entire side edge of the waist edge or crotch envelope. More preferably.

The basis weight of the cell forming sheet is preferably 10 to 50 g / m ² . If it is less than 10 g / m ² , the bulk of the sheet is too small, and there is a risk of causing problems such as the adhesive that fixes the stretchable material permeates through the sheet. On the other hand, if it exceeds 50 g / m ² , 1) the sheet rigidity is too high and it becomes difficult to bend in conjunction with the contraction of the elastic material, and it becomes difficult to form a cell structure. However, there is a risk that the feeling of wear will be reduced.

  The cell forming sheet 282 shown in FIGS. 12B and 12C and the cell forming sheet 382 shown in FIGS. 13A and 13B are configured as members independent of other members. However, the cell forming sheet need not be configured as an independent member. For example, in the disposable diaper 1 shown in FIG. 1D, a part of the outer sheet 66 constituting the stretchable nonwoven fabric (stretchable part 80) is folded to form the folded part 88, and the folded part 88 is used as the cell forming sheet 82. Yes. Similarly, in the disposable diaper 201 shown in FIG. 12C, it is possible to adopt a configuration in which a folded portion is formed by folding a part of the nonwoven fabric sheet 32 constituting the three-dimensional gather 26 and the folded portion is used as a cell forming sheet. .

  In addition, in the disposable diaper 201 shown to FIG. 12B and FIG. 12C, the cell formation sheet 282 is arrange | positioned on the inner surface of the solid gathers 26. FIG. When the disposable diaper 201 is used, as shown in FIG. 12F, the three-dimensional gather 26 comes into contact with the wearer's skin in a state of falling outward. Therefore, the cell forming sheet 282 disposed on the inner surface of the three-dimensional gather 26 comes into contact with the wearer's skin, and the effect of the present invention is exhibited. In addition, the dashed-dotted line in FIG. 12F shows a wearer's buttocks.

  The cell forming sheet may be formed with a hole for communicating the inner space of the diaper with the cell formed by the cell forming sheet. By setting it as such a structure, since moisture flows into a cell via a hole from the interior space of a diaper, a new thing becomes difficult to dew condensation on the skin contact surface of a diaper.

  The “hole” means an opening that allows the internal space of the diaper and the cell to communicate with each other, and the shape thereof is not particularly limited. For example, shapes such as a circle, an ellipse, and a polygon (triangle, square, etc.) can be mentioned.

  The “hole” includes not only one that is always open, but also one that can be opened and closed. For example, by forming slits with convex trajectories or a plurality of intersecting slits in the cell forming sheet, a hole having a tongue piece functioning as a valve can be obtained. The tongue piece allows moisture to pass through while preventing urine and body fluid from entering the cell.

  The form of the slit is not particularly limited. Examples of the “slit having a convex locus” include a) a slit having a curved portion (such as an inverted U-shaped slit) and b) a slit having a bent portion (such as an inverted V-shaped slit). Examples of “a plurality of intersecting slits” include c) a cross-shaped slit formed by intersecting two slits, and d) a star-shaped slit formed by intersecting three slits. Can do.

  The holes are preferably formed in a portion of the cell forming sheet where cells are formed (that is, the region between the joints). In particular, when the cell forming sheet 82 is formed by the folded portion 88 as in the disposable diaper 1 shown in FIG. 1D, a hole is formed in the vicinity of the tip of the folded portion, and the folded portion further than the hole. It is preferable that the part near the tip of the is joined to the stretchable part. Such a form is preferable because the hole is forcibly opened by the contraction of the stretchable portion.

  In the above configuration, the forcibly opened holes serve as the end openings of the cells. Accordingly, moisture in the diaper inner space flows into the cell through the forcibly opened hole, passes through the cell, and is formed at the folded line portion (waist end edges 62c and 65c in the example of FIG. 1D). Permeated through and discharged into the outer space of the diaper. Such a configuration is preferable in that moisture is likely to flow into the cell and moisture is easily discharged to the outside of the diaper as compared with a structure in which holes are simply formed in the cell forming sheet.

  A plurality of holes may be formed in the cell forming sheet. By forming a plurality of holes, the air permeability is improved and the moisture is easily discharged to the outside of the diaper.

The specific number of “plurality” is not particularly limited. It depends on the opening area of the hole. If the opening area is 0.5 to 10 mm ² , 5 to ²⁰⁰ holes are preferably formed, more preferably 10 to 100 holes. The effect of improving air permeability can be obtained by setting the number to 5 or more. On the other hand, by setting it to 200 or less, it is possible to effectively prevent urine and body fluid from flowing into the cell.

  It is also a preferable form that the drug is adhered to the cell forming sheet. By attaching the drug, it is possible to impart a medicinal effect based on the drug to the cell-forming sheet that is in direct contact with the skin of the wearer.

  The type of drug is not particularly limited. For example, moisturizing agents (aloe extract, propylene glycol, etc.); in addition to providing moisturizing effect, skin care additives having urease inhibitory activity (eucalyptus extract, etc.); Luconium etc.), deodorants (various polyphenol compounds etc.), etc. can be mentioned.

[2-3] Cell:
In the disposable diaper of the present invention, as shown in FIG. 1D and FIG. 1F, a joining portion 84 that joins the cell forming sheet 82 and the stretchable portion 80 is formed. Then, cells 86 extending in the crossing direction intersecting with the shrinking direction of the stretchable part 80 are partitioned and formed between the cell forming sheet 82 and the stretchable part 80 by the joining part 84. The cell 86 is a non-penetrating cell having one end opened and the other end closed.

  In the structure, following the contraction of the expansion / contraction part 80, the distance between the joint part 84 of the cell forming sheet 82 and the expansion / contraction part 80 is also narrowed, and the cell 86 is formed. This cell 86 improves the breathability and flexibility of the diaper. Moreover, if it is the said structure, the precise joining techniques, such as joining sheets in consideration of the position of an elastic material like the underpants type absorbent article of patent documents 1-5, are unnecessary. Therefore, it can be manufactured easily. Further, since one end of the cell 86 is opened and the other end is closed, excrement does not leak through the internal space of the cell 86.

  In order to reliably form the cells, a structure in which the cell-forming sheet is loosely bonded to a stretchable nonwoven fabric in a natural state (a state where no stretch force is applied to the stretchable portion) is preferable. That is, the structure in which the cell-forming sheet is longer in the natural state than the stretchable nonwoven fabric is preferable. According to the said structure, expansion | extension of an expansion-contraction part is hard to be prevented by the cell formation sheet. Further, the cells are reliably formed in the natural state.

  The structure can be formed by the following method, for example. A stretchable nonwoven fabric in which the nonwoven fabric itself, such as an elastic nonwoven fabric, is stretchable is in its original size in a natural state (a state where no tension is applied). Therefore, when the stretchable part is formed of the stretchable nonwoven fabric, it is preferable to join the cell forming sheet in a state where the stretchable nonwoven fabric is stretched from its original size.

  On the other hand, the stretchable nonwoven fabric in which stretched stretchable materials are arranged between layers of a plurality of nonwoven fabric sheets is in a state of being contracted from its original size in a natural state. Therefore, when the stretchable part is formed by the stretchable nonwoven fabric, it is preferable to join the cell forming sheet in a state where the stretchable nonwoven fabric is stretched from the contracted state.

  In addition, when the stretchable part is formed by a stretchable nonwoven fabric in which stretched stretchable materials are arranged between layers of a plurality of nonwoven fabric sheets, the nonwoven fabric sheet and the cell forming sheet, which are constituent materials of the stretchable nonwoven fabric, are laminated and joined. As a result, cells are formed in advance. Then, it is preferable to form a stretchable nonwoven fabric by a method in which a stretchable stretch material is disposed and fixed between layers of the nonwoven fabric sheet to which the cell forming sheet is bonded and another nonwoven fabric sheet.

  In the said method, a cell formation sheet is joined with respect to the nonwoven fabric sheet to which shrinkage force does not act. Therefore, the cell forming sheet can be easily bonded as compared with the case where the cell forming sheet is bonded to the stretchable nonwoven fabric. On the other hand, when joining a cell formation sheet with an elastic nonwoven fabric, it is necessary to join in the state which extended the elastic nonwoven fabric. Therefore, the cell forming sheet cannot be bonded to a desired state, and there may be a problem that the cell forming sheet is wrinkled or a device for bonding becomes complicated.

  Bonding of the stretchable nonwoven fabric and the cell-forming sheet can be fixed by adhesion using an adhesive, welding by heat, ultrasonic waves, or the like. As the adhesive, a hot-melt adhesive or other highly fluid adhesive can be used. Examples of the welding method include heat sealing.

  The form of the joint is not particularly limited as long as it can form a non-penetrating cell that extends in the crossing direction intersecting the contraction direction of the stretchable part and is open at one end and closed at the other end. However, since the cells extending in the intersecting direction intersecting the contraction direction of the stretchable part are formed, the joint part is intermittently formed with respect to the contraction direction of the stretchable part.

  As such a form, for example, the joint portion 84 shown in FIGS. 1F and 2A, the joint portion 84D shown in FIG. 7A, the joint portion 84E shown in FIG. 8A, and the joint portion 84F shown in FIG. An example is a zigzag shape continuous in the shrinking direction. Moreover, it is good also as a wavy shape which follows the shrinkage | contraction direction of the expansion-contraction part 80 like the junction part 84A shown to FIG. 4A, the junction part 84B shown to FIG. 5A, and the junction part 84C shown to FIG.

  The distance between the joints at the open end of the cell is preferably 2 to 50 mm, particularly preferably 5 to 10 mm.

  In the disposable diaper 1 shown in FIG. 1D, the folded-back portions 88 of the outer sheets 63 and 66 serving as the cell forming sheet 82 are joined to the pressing sheet 68 constituting the stretchable portion 80 (stretchable nonwoven fabric) (joint portion 84). . FIG. 2A is a schematic plan view schematically showing an enlarged form of the joint portion 84 of the disposable diaper 1 shown in FIG. 1B.

  As shown in FIG. 2A, the joint portion 84 is formed in a zigzag shape toward the diaper waist direction (left and right direction in the drawing). That is, the joint portion 84 is intermittently formed in the contraction direction (the left-right direction in the drawing) of the stretchable portion 80. Each of the cells 86 is formed so that the shape in plan view is a triangular shape.

  And as a cell, as shown to FIG. 2A and FIG. 2C, the edge part (end part by the side of the waist edge 65c) near the outer space of a diaper is opened, and the edge part far from the outer space of a diaper is opened. Closed cell 86 (outward cell), and a cell whose end far from the outer space of the diaper is opened and whose end closer to the outer space of the diaper is closed as shown in FIGS. 2A and 2B 86 (inward cell) are formed.

  In the example shown in FIGS. 2A to 2C, a cell row is formed in which a plurality of cells 86 are arranged in parallel in the shrinking direction of the stretchable portion 80. Therefore, moisture or the like can easily flow in the front-rear direction of the diaper, and exhaust of moisture or the like from the inner space of the diaper can be promoted. Moreover, it is easy to make a diaper follow the curvilinear shape around a wearer's waist, and it is excellent also in fitting property and a feeling of wear.

  In this cell row, outward cells and inward cells are alternately arranged. In such a form, the air in the external space of the diaper is taken into the outward cell, and the moisture in the internal space of the diaper is taken into the inward cell. Therefore, the air and the moisture are exchanged between adjacent outward cells and inward cells, and the exhaust of the moisture is promoted. In the example shown in FIG. 2A, outward cells and inward cells are alternately partitioned by zigzag joints 84.

  2A is formed in a continuous linear shape. However, you may form as an aggregate | assembly of a some dot-shaped junction part. Such a form has an effect that it is difficult to cause pain even when a joint portion that tends to become hard to touch touches the skin. In order to grasp a plurality of dot-like joints as an “aggregate”, the interval between adjacent dot-like joints needs to be 5 mm or less. A circular shape etc. can be mentioned as a shape of a dot-shaped junction part.

  3A and 3B are as follows: 1) A cell row in which a plurality of cells 86 are arranged in parallel toward the contraction direction of the expansion / contraction section 80 is formed by the joint section 84; 2) 2A to 2C are common in that outward cells and inward cells are alternately arranged in the cell row. Therefore, the effects resulting from these forms are the same as those shown in FIGS. 2A to 2C. On the other hand, the form shown in FIGS. 3A and 3B is different from the form shown in FIGS. 2A to 2C in that a slit 89 is formed in the vicinity of the waist edge 65c of the cell forming sheet 82. By forming the slit 89, the opening of the outward cell can be exposed to the waist edge 65c side, and air permeability and dehumidification can be improved.

  The form shown in FIGS. 4A to 4C uses a nonwoven fabric sheet 69 as the cell forming sheet 82A. 1) A plurality of cells 86A are arranged in parallel toward the contraction direction of the stretchable portion 80 by the joint portion 84A. The point that the cell row is formed, and 2) The point that the outward cells and the inward cells are alternately arranged in the cell row is the same as the form shown in FIGS. 2A to 2C. Therefore, the effects resulting from these forms are the same as those shown in FIGS. 2A to 2C. However, in the form shown in FIGS. 4A to 4C, the joint portion 84 </ b> A is formed in a wavy line shape toward the waist circumference direction of the diaper.

  5A and 5B uses a nonwoven fabric sheet 69 as the cell forming sheet 82A. 1) A plurality of cells 86B are arranged in parallel toward the contraction direction of the stretchable portion 80 by the joint portion 84B. In the point where the cell row | line | column is formed, it is common with the form shown to FIG. 2A-FIG. 2C. Therefore, the effects resulting from these forms are the same as those shown in FIGS. 2A to 2C.

  However, the form shown in FIGS. 5A and 5B is that the cell rows of a plurality of stages (in this example, two stages) are arranged in the intersecting direction intersecting the contraction direction of the expansion / contraction part 80. It is different from the form shown in FIG. 2C. Further, cell rows close to the waist edge 65c (upper cell row) are arranged in parallel with outward cells, and cell rows far from the waist edge 65c (cell row below the drawing) are arranged in parallel with inward cells. It has been done. Compared with the forms shown in FIGS. 2A to 2C, such a form is easily deformed following the wearer's movement because the cell row is divided into multiple stages. That is, it is preferable in terms of high flexibility and fit. In the form shown in FIGS. 5A and 5B, the joining portion 84 </ b> B is formed in a wavy line shape so that the U-shape continues in the circumferential direction of the diaper.

  6A to 6C use the folded portion 88 of the outer sheet 66 as the cell forming sheet 82B and the non-woven fabric sheet 67 as the cell forming sheet 82C. 1) The cell forming sheet 82B faces the crossing direction intersecting with the shrinking direction of the stretchable portion 80. A plurality of (two in this example) cell rows are arranged, and 2) the joining portion 84C is formed in a wavy shape arranged so that the U-shape is continuous toward the circumference of the diaper. In this respect, the configuration shown in FIGS. 5A and 5B is common. Therefore, the effects resulting from these forms are the same as those shown in FIGS. 5A and 5B. However, in the forms shown in FIGS. 6A to 6C, inward cells are arranged in parallel in all the cell rows.

  6A to 6C, it intersects with the contraction direction (the left-right direction in the drawing) of the expansion / contraction part 80 in the joint portion 84C that partitions and forms the cell 86C in one cell row (the cell row on the lower side in the drawing). A portion extending in the intersecting direction (vertical direction in the drawing) and a portion extending in the intersecting direction of the joint portion 84C that partitions and forms the cell 86C in the cell row adjacent to the one cell row (cell row on the upper side in the drawing). The plurality of cell rows are arranged so as not to be arranged on a straight line.

  In other words, an extension line of a portion extending in the intersecting direction (vertical direction in the drawing) of the joint portion 84C that defines the cell 86C in one cell row (the cell row on the lower side of the drawing) is adjacent to the one cell row. A plurality of cell columns are arranged so as to pass through the cell 86C in the cell column to be processed.

  When the cell 86C rises due to the contraction of the expansion / contraction part 80, a part of the joint part 84C becomes a trough part, and there is a possibility that excrement leaks through the trough part. However, in the forms shown in FIGS. 6A to 6C, the position of the joint portion 84 </ b> C is shifted so that the valleys of the cell rows formed in multiple stages are not continuous. Therefore, there is an advantage that excrement is less likely to leak through the valley. In addition, the inward cells in the upper cell row in the drawing capture the excrement transmitted through the joint 84C of the lower cell row in the drawing by arranging the inward cells in the upper cell row in the drawing. It is excellent in leakage prevention effect.

  The form shown in FIGS. 7A to 7C uses a nonwoven fabric sheet 67 as the cell forming sheet 82C. 1) The joining portion 84D is formed in a zigzag shape toward the waist of the diaper (the left-right direction in the drawing). 3) A cell row in which a plurality of cells 86D are arranged in parallel in the contraction direction of the expansion / contraction part 80 is formed. 3) A cell row is formed by alternately arranging outward cells and inward cells. In this respect, the configuration shown in FIGS. 2A to 2C is common. Therefore, the effects resulting from these forms are the same as those shown in FIGS. 2A to 2C.

  Moreover, the form shown in FIGS. 7A to 7C is different from that shown in FIGS. 5A and 5C in that a plurality of (two in this example) cell rows are arranged in the crossing direction that intersects the shrinking direction of the expansion / contraction part 80. This is the same as that shown in FIG. 5B. Therefore, the effect resulting from this embodiment is the same as that shown in FIGS. 5A and 5B.

  Furthermore, in the form shown in FIGS. 7A to 7C, two independent cell forming sheets 82C corresponding to each cell row are provided. That is, the folded portion 88 of the outer sheet 66 is not used as a cell forming sheet. By providing the independent cell forming sheet 82C, all the cells 86D are exposed toward the inner space of the diaper, the waist edge 65c.

  The form shown in FIGS. 8A to 8C uses a nonwoven fabric sheet 67 as the cell forming sheet 82C. 1) The joint portion 84E is formed in a zigzag shape toward the waist of the diaper (the left-right direction in the drawing). 3) A cell row in which a plurality of cells 86E are arranged in parallel in the contraction direction of the expansion / contraction part 80 is formed. 3) The cell row is formed by alternately arranging outward cells and inward cells. 4) A point in which a plurality of cell rows (two in this example) are arranged in the crossing direction intersecting with the shrinking direction of the expansion / contraction part 80, and 5) a cell corresponding to each cell row. In the point provided with formation sheet 82A, 82B, it is common with the form shown to FIG. 7A-FIG. 7C. Therefore, the effect which arises from this form is the same as that of the form shown to FIG. 7A-FIG. 7C.

  However, in the form shown in FIGS. 8A to 8C, it intersects with the contraction direction (horizontal direction in the drawing) of the expansion / contraction part 80 in the joint portion 84E that defines the cell 86E in one cell row (the cell row on the lower side in the drawing). A portion extending in the intersecting direction (vertical direction in the drawing) and a portion extending in the intersecting direction of the joint portion 84E that defines the cell 86E in the cell row adjacent to the one cell row (cell row on the upper side in the drawing). The plurality of cell rows are arranged so as not to be arranged on a straight line.

  In other words, an extension line of a portion extending in the intersecting direction (vertical direction in the drawing) of the joint portion 84E that defines the cell 86E in one cell row (the cell row on the lower side of the drawing) is adjacent to the one cell row. A plurality of cell columns are arranged so as to pass through the cell 86E in the cell column to be performed. Therefore, the same effects as those shown in FIGS. 6A to 6C can be obtained.

  The form shown in FIG. 9 is the same as the form shown in FIGS. 8A to 8C with the cell string increased from two stages to three stages. In this embodiment, three independent nonwoven fabric sheets 71 corresponding to each cell row are used as the cell forming sheet 82D. A plurality of cells 86 </ b> F are formed by the joint portions 84 </ b> F formed in a zigzag shape toward the waist of the diaper (the horizontal direction in the drawing). This form has the same effect as the form of FIGS. 8A to 8C. And by making a cell row into 3 steps | paragraphs, a softness | flexibility and fitting property further improve compared with the form shown to FIG. 8A-FIG. 8C.

  The form shown in FIG. 10A or 10B is the same as the form shown in FIGS. 8A to 8C, and only the form of the cell forming sheets 82E and 82F is different. The form shown in FIG. 10A or FIG. 10B uses nonwoven fabric sheets 73 and 75 as the cell forming sheets 82E and 82F, and the cell opening end side end portion has a multilayer structure. The waist of cell formation sheet 82E, 82F can be strengthened by setting it as a multilayer structure. Therefore, even if the cell 86E is compressed by body pressure, the cell opening is not easily crushed, and the cell 86E is easily held in the open state.

  In the form shown in FIG. 10A or 10B, the cell non-opening end side ends of the cell forming sheets 82E and 82F also have a multilayer structure. With such a structure, the cell forming sheets 82E and 82F are likely to rise from the end of the cell non-opening end, and the cell 86E can be easily held in the open state.

  In addition, the method of making a cell opening end side edge part into a multilayer structure is not specifically limited. As shown in FIG. 10A, the end portion of the cell forming sheet 82E may be folded downward to form a multilayer structure, or the cell forming sheet 82F may be folded upward to form a multilayer structure as shown in FIG. 10B. May be. Alternatively, a separate sheet may be bonded to the cell forming sheet to form a multilayer structure.

[2-4] Application location:
In the disposable diaper of this invention, it does not specifically limit about the site | part which forms a cell structure. For example, the present invention can be applied to the following parts.

[2-4a] Waist elastic material arrangement part:
The stretchable waist stretchable material is fixed between the layers of the nonwoven fabric sheet, and the stretchable waist stretchable material has a stretchable nonwoven fabric structure. And a waist elastic material is arrange | positioned along the waist edge of a front envelope part or a back envelope part in many cases. Therefore, a cell structure can be formed in the waist elastic material arrangement | positioning part by joining a cell formation sheet | seat intermittently to a waist elastic material arrangement | positioning part.

  For example, the disposable diaper 1 shown in FIGS. 1B and 1D has a structure of a stretchable nonwoven fabric (stretchable portion 80) in which a stretchable waist stretchable material 42 is fixed between the folded portion 88 of the outer sheets 63 and 66 and the pressing sheet 68. Have That is, the expansion / contraction part 80 is in a region near the waist edge of the front envelope part 2 or the rear envelope part 6 (in this example, the waist edge 62c of the front exterior body 62 and the waist edge 65c of the rear exterior body 65). Is formed. And the cell formation sheet 82 is joined to this expansion-contraction part 80 (joining part 84).

[2-4b] Leg elastic material arrangement part:
The leg stretchable material has a stretchable nonwoven fabric structure in which the stretchable leg stretchable material is fixed between the layers of the nonwoven fabric sheet. And a leg elastic material is arrange | positioned along the side edge of a crotch envelope part in many cases. Therefore, a cell structure can be formed in a leg elastic material arrangement | positioning part by joining a cell formation sheet to a leg elastic material arrangement | positioning part.

  For example, the disposable diaper 301 shown in FIG. 13B has a structure of a stretchable nonwoven fabric (stretchable portion 380) in which a stretchable leg stretchable material 340 is fixed between the side sheet 319 and the cover sheet 324. That is, the expansion / contraction part 380 is formed in a region between the fixed end (lower end) of the three-dimensional gather 326 and the side edges of the crotch envelope part 304 (in this example, the side edges 370a and 370b of the diaper main body 370). And the cell formation sheet 382 is joined to this expansion-contraction part 380 (joining part 384).

[2-4c] Three-dimensional gather elastic material arrangement part:
The three-dimensional gather arrangement portion has a stretchable nonwoven fabric structure in which stretched three-dimensional gather stretchable materials are fixed between layers of the nonwoven fabric sheet. And a three-dimensional gather is often formed in the direction along the side edge of a crotch envelope part. Therefore, a cell structure can be formed in a solid gather stretchable material arrangement part by intermittently joining a cell formation sheet to a solid gather stretchable material arrangement part.

  For example, in the disposable diaper 201 illustrated in FIG. 12C, the three-dimensional gather 26 is formed by a part of the nonwoven fabric sheet 32. Moreover, it has the structure of the stretchable nonwoven fabric (stretchable part 280) in which the stretched three-dimensional gather stretchable material 36 is fixed between the base part and the folded part of the nonwoven fabric sheet 32. That is, the expansion / contraction part 280 is formed in a region between the fixed end (lower end) of the three-dimensional gather 26 and the free end (upper end). And the cell formation sheet 282 is joined to this expansion-contraction part 280 (joining part 284).

[2-5] Production method:
The manufacturing method of the disposable diaper of this invention is demonstrated.

  The disposable diaper 1 shown to FIG. 1A-FIG. 1E can be manufactured according to a process as shown, for example in FIG. 11A and FIG. 11B. FIG. 11A is a process diagram schematically showing a process of manufacturing the disposable diaper 1 shown in FIGS. 1A to 1E. For the convenience of drawing, this figure shows only the portion corresponding to the vicinity of the waist edge in the rear envelope of one pant-type diaper. FIG. 11B is a schematic end view schematically showing a cut end surface obtained by cutting each step shown in FIG. 11A at the center in the width direction of the structural unit shown in FIG. 11A.

  First, as shown to (a) figure of FIG. 11A and FIG. 11B, the outer sheet | seat 66 used as the cell formation sheet 82 and the pressing sheet | seat 68 used as the nonwoven fabric sheet which comprises an expansion-contraction part are prepared. The inner sheet 64 is bonded to the outer sheet 66 in advance so that a part (exposed portion 78) of the outer sheet 66 is exposed. This joining is performed by a hot melt adhesive or the like.

  Next, as shown in FIGS. 11A and 11B (b), the pressing sheet 68 is joined to the folded portion 88 of the outer sheet 66 to form a joined portion 84. At this time, bonding is performed so that the pressing sheet 68 protrudes from the edge of the outer sheet 66. In the illustrated example, the joining portion 84 is formed by heat sealing. And the junction part 84 is formed in the zigzag shape which continues in the trunk periphery direction (drawing left-right direction) of a diaper.

  Further, as shown in FIGS. 11A and 11B (c), the waist stretchable material 42 is disposed in an expanded state on the exposed portion 78 of the outer sheet 66 and bonded thereto. At the same time, an absorbent main body 14 is attached. The exposed portion 78 and the pressing sheet 68 sandwiching the waist elastic material 42 are bonded on a continuous surface.

  Adhesion of the waist stretchable material 42 is as follows: 1) A hot melt adhesive is continuously applied to the exposed portion 78 of the outer sheet 66 or the holding sheet 68 constituting the stretchable portion 80, and the waist stretchable material 42 is applied to the coated portion. 2) A method of arranging and bonding in the stretched state, 2) A method of directly applying or spraying the hot melt adhesive to the waist elastic material 42, and bonding the waist elastic material 42 in the expanded state, 3) An exposed portion 78 or a pressing sheet 68. The waist stretchable material 42 is placed in the stretched state on the upper part of the fabric, and in that state, the hot melt adhesive is sprayed to adhere the hot melt adhesive to both the exposed portion 78 or the holding sheet 68 and the waist stretchable material 42. 4) The waist stretchable material 42 is placed in an expanded state on the exposed portion 78 or the surface of the holding sheet 68, and in this state hot melt is applied. Coating the Chakuzai spray to continuously depositing the hot-melt adhesive to both of the exposed portion 78 or the presser sheet 68 and the waist elastic member 42 can be carried out by a method such as bonding.

  “Continuous coating” in these forms includes not only a form in which the adhesive is solid-coated or sprayed over the entire surface but also a form in which the adhesive is applied in a spiral shape. In other words, any form may be used as long as the joint is continuously formed in the circumferential direction of the disposable diaper. Even when any one of the methods 1) to 4) is adopted, the joint portion is continuously formed in the circumferential direction of the disposable diaper. Therefore, a continuous space in the front-rear direction of the disposable diaper is not formed between the exposed portion 78 and the pressing sheet 68 constituting the stretchable portion 80. On the other hand, the cells are formed between the pressing sheet 68 and the cell forming sheet 82 (folded portion 88), and the air permeability and flexibility are improved by the cells.

  The bonding method of 1) is a method such as slit coater (sim coater), curtain spray, spiral spray, omega coat, etc., and the bonding method of 2) is a method such as comb gun, omega coat, Sure wrap, etc. 3) And the adhesion method of 4) can be implemented by techniques such as omega coat and summit. For example, Omega Coat is used by using, for example, an omega nozzle head (ITW Dynatech), Summit is used by Summit nozzle (manufactured by Nordson), and Sure Wrap is used by using Sure Wrap nozzle (manufactured by Nordson). can do.

  Finally, as shown in FIGS. 11A and 11B (d), the folded portion 88 of the outer sheet 66 and the presser sheet 68 joined to the outer sheet 66 are folded at a position corresponding to the waist edge 65c. It is superimposed on the exposed portion 78 of the outer sheet 66. Thereafter, the pressing sheet 68 is fixed with a hot melt adhesive so that a part of the absorbent main body 14 is covered with a part of the pressing sheet 68. Thereby, the elastic part 80 by which the waist elastic material 42 was inserted | pinched between the layers of the nonwoven fabric sheet is formed.

  The series of steps as described above can be continuously performed by mechanical means. By adopting a method / apparatus such as continuously feeding a long sheet material from a roller, a large number of disposable diapers can be manufactured continuously. For example, it is preferable that the long sheet material and the long stretchable material are sent out in the left-right direction in the drawing, and the production is performed in a continuous form so that the illustrated structural unit is repeated in the left-right direction in the drawing.

[3] Components of disposable diapers:
The disposable diaper of this invention is equipped with the absorber 22 at least like the disposable diaper 1 shown to FIG. 1C and FIG. 1D. Usually, in addition to the absorber 22, the top sheet 18, the back sheet 20, and the like are provided as constituent members. Moreover, according to the objective, you may provide other structural members, such as a three-dimensional gather and various elastic materials.

[3-1] Absorber:
An “absorber” is a structure made of an absorbent material. Used to absorb and retain the wearer's urine. Examples of the absorbent material include fluff pulp, super absorbent polymer (hereinafter referred to as “SAP”), a hydrophilic sheet, and the like. As the fluff pulp, wood pulp or non-wood pulp defibrated, etc., as the SAP, sodium polyacrylate, etc., as the hydrophilic sheet, tissue, absorbent paper, and hydrophilic treatment were performed. It is preferable to use a nonwoven fabric or the like.

  As the “absorber”, it is preferable to use a material in which one or more absorbent materials are formed into a mat shape. The mat may be a single layer or multiple layers. Especially, what combined 10-500 mass parts SAP with respect to 100 mass parts of fluff pulp is preferable. At this time, the SAP may be mixed in the fluff pulp mat, or may be used in the form of a layer between a plurality of fluff pulp mats.

  In order to prevent SAP from falling off and to give shape stability, it is preferable to encapsulate the entire absorbent body with the hydrophilic sheet. As shown in FIG. 1C and FIG. 1D, the absorbent body 22 is entirely encapsulated by an upper tissue 54 and a lower tissue 56 that are hydrophilic sheets. The absorber 322 shown in FIG. 13B has a similar structure. That is, the entire absorbent body 322 is encapsulated by an upper tissue and a lower tissue (not shown).

  What is necessary is just to use what was shape | molded in desired shapes, such as rectangular shape and an hourglass shape, according to the objective. For example, the absorbent body 22 shown in FIGS. 1C and 1D is an example using a rectangular absorbent body. Note that the “absorber” is normally covered with the top sheet 18 on the front side and the back sheet 20 on the back side, like the absorber 22 shown in FIGS. 1C and 1D. That is, the absorber 22 is generally disposed between the top sheet 18 and the back sheet 20.

[3-2] Top sheet:
The “top sheet” is a sheet disposed so as to cover the surface of the absorbent body (the surface on the side facing the wearer's skin when the diaper is worn). Since it is necessary to allow the wearer's urine or the like to pass therethrough, at least a part (all or a part) of the wearer is made of a liquid-permeable material.

  Examples of the liquid permeable material include woven fabric, nonwoven fabric, and porous film. Among these, it is preferable to use a nonwoven fabric made of a thermoplastic resin such as polypropylene, polyethylene, polyester, aliphatic polyamide, etc., which has been subjected to a hydrophilic treatment.

  As said nonwoven fabric, the nonwoven fabric manufactured by manufacturing methods, such as air through (card hot air) and card | curd embossing, can be used conveniently. The hydrophilic treatment can be performed by applying, spraying, impregnating, etc., a surfactant to the raw cotton of the nonwoven fabric.

  The top sheet is “at least partially” made of a liquid-permeable material. The position is not particularly limited. However, it is preferable that the part which overlaps with the arrangement position of the absorber in the crotch envelopment part when viewed in plan is made of a liquid-permeable material.

  In the disposable diaper of the present invention, it is not necessary that the entire surface on the side facing the wearer's skin is covered with the top sheet. For example, in a tape-type disposable diaper, as shown in FIGS. 13A to 13C, a top sheet 318 made of a liquid-permeable material may be disposed only at the center of the diaper around the trunk. At this time, in many cases, a side sheet 319 made of a breathable and water-repellent material is disposed on the side edge of the diaper around the waist. As the breathable water repellent material, it is preferable to use a non-woven sheet obtained by a method such as card embossing or spunbonding. In particular, it is preferable to use a non-woven fabric sheet such as SMS or SMMS having a high waterproof property.

[3-3] Backsheet:
A backsheet is a sheet | seat arrange | positioned so that the back surface (surface on the side which turns away from a wearer's skin at the time of mounting | wearing of a diaper) may be coat | covered. The back sheet is made of a liquid-impermeable material in order to prevent the wearer's urine from leaking outside the diaper.

  There is no restriction | limiting in particular about the arrangement position of a back seat | sheet. From the viewpoint of preventing leakage of urine absorbed by the absorbent body, it is preferable that the back sheet is disposed so as to cover at least the position where the absorbent body is disposed.

  Examples of the liquid impermeable material include a liquid impermeable film made of a resin such as polyethylene. Among these, it is preferable to use a microporous polyethylene film. This microporous polyethylene film is a film in which a large number of fine pores of 0.1 to several μm are formed, and is liquid-impermeable but moisture-permeable. Therefore, it is possible to prevent the diaper internal space from being steamed while ensuring leakage prevention.

  In the tape-type disposable diaper, as shown in FIGS. 13B to 13D, a cover sheet 324 is often bonded to the outer surface side of the back sheet 320. The cover sheet 324 is used to reinforce the back sheet 320 and to improve the touch (feel) of the back sheet 320.

  Examples of the material constituting the cover sheet include woven fabric and non-woven fabric. Especially, it is preferable to use the dry nonwoven fabric and wet nonwoven fabric which consist of thermoplastic resins, such as polyethylene, a polypropylene, and polyester.

[3-4] Solid gathering:
The “three-dimensional gather” is a leak-proof wall that is arranged on the skin contact surface of the diaper and rises three-dimensionally. It is used for the purpose of preventing a lateral excretion of excrement in combination with the leg elastic material by contacting the skin of the wearer. As in the three-dimensional gather 26 shown in FIG. 1C, a structure in which the three-dimensional gather stretchable material 36 in an expanded state is sandwiched and fixed between layers of the nonwoven fabric sheet 32 is often used. With such a structure, the three-dimensional gather 26 stands up three-dimensionally due to the contraction force of the three-dimensional gather expansion / contraction material 36.

  As shown in FIGS. 1B and 1C, the three-dimensional gathers 26 are often arranged in a pair on the left and right sides of the absorber 22. However, two or more pairs of right and left solid gathers may be arranged on both sides of the absorber. For example, a pair of three-dimensional gathers that mainly contact the wearer's crotch to prevent side leakage are arranged inside the diaper torso in the direction around the waist of the diaper, and another pair of three-dimensional gathers that mainly contact the wearer's legs and prevent side leakage (It may be referred to as “three-dimensional leg gathers”) may be adopted in which the diaper is disposed on the outer side in the torso direction.

  The material of the nonwoven fabric sheet is not particularly limited. However, similarly to the side sheet, a nonwoven fabric sheet made of a breathable water-repellent material can be suitably used.

  The nonwoven fabric sheet may exclusively form a three-dimensional gather, or may form a three-dimensional gather and other members of the diaper. In the case of a pants-type disposable diaper, as shown in FIG. 1C, a nonwoven fabric sheet 32 that exclusively forms a three-dimensional gather is used, and this is attached to the absorbent main body 14, and the three-dimensional gather 26 is configured integrally with the absorbent main body 14. It is often the form to do. On the other hand, in the case of a tape-type disposable diaper, as shown in FIGS. 13A and 13B, a three-dimensional gather 326 and a side sheet 319 are often configured by a nonwoven fabric sheet 332 made of a water-repellent nonwoven fabric or the like.

[3-5] Absorbent body:
The “absorbent body” is an absorbent pad in which an absorbent body is included. An absorptive main body constitutes an underpants type disposable diaper united with an exterior body mentioned below. “Absorption pad” refers to a pad-like member in which an absorbent body, a top sheet, and a back sheet are integrally formed.

  For example, like the absorbent main body 14 shown in FIG. 1C and FIG. 1D, the top sheet 18 that covers the surface of the absorbent body 22 and the back sheet 20 that covers the back surface of the absorbent body 22 are The thing of the structure where the absorber 22 was included between the layers of the top sheet 18 and the back sheet | seat 20 bonded together can be mentioned. In addition, the absorptive main body 14 shown to FIG. 12B-FIG. 12D has the same structure as the absorptive main body 14 shown to FIG. 1A-FIG. 1E.

[3-6] Exterior body:
The “exterior body” is a structure that encloses the wearer's torso. The “exterior body” is a pants type that is formed alone or integrally with the absorbent main body and in which one waist opening and a pair of leg openings are formed.

  The exterior body 16 shown in FIG. 1B includes a front exterior body 62 and a rear exterior body 65 that enclose the circumference of the wearer's trunk. And the pants type | mold in which the one waist opening part 10 and a pair of leg opening part 12 were formed integrally with the absorptive main body 14 is exhibited. 12A includes a front covering portion 202, a crotch covering portion 204, and a rear covering portion 206 that are integrally configured, and the exterior body 216 alone includes one waist opening 210 and a pair of legs. It presents a pants shape in which an opening 212 is formed.

  In the exterior bodies 16 and 216, fastener members that can be engaged are attached instead of the joint portions 7 and 8 (joint portions 207 and 208), and the fastener members can be engaged with each other to form a pants type. The “exterior body” is also included in a form in which the fastener members are engaged with each other in advance to form a pants shape. Examples of the fastener member include a mechanical fastener.

  The material of the exterior body is not particularly limited. However, it is preferable that the inner space of the diaper is made of a material having excellent air permeability so as to prevent stuffiness. Examples of the material include non-woven fabric made of polyethylene, polypropylene, polyester, and other synthetic fibers.

  The exterior body is often configured by bonding two or more nonwoven fabrics together. For example, the exterior body 16 illustrated in FIG. 1D is configured by a laminated body in which two or more nonwoven fabrics (inner sheets 61 and 64, outer sheets 63 and 66, and a pressing sheet 68) are bonded together. The exterior body 216 shown in FIG. 12D is also configured by a laminate in which two or more nonwoven fabrics (the inner sheet 15, the outer sheet 17, and the pressing sheet 68) are bonded together. Usually, various stretchable materials are fixed between the two or more nonwoven fabric layers.

[3-7] Diaper body:
Tape-type disposable diapers often do not take a two-piece configuration of an absorbent main body and an exterior body. In a tape-type disposable diaper, a structure in which an absorbent body and various sheets covering the absorbent body are integrally formed is referred to as a “diaper body”. The “diaper main body” is a member that includes an absorbent body between layers of various sheets and exhibits an absorption / holding function that is an essential function of the diaper. On the other hand, members that do not enclose the absorbent body and do not exhibit the absorption / holding function (side flaps, fastening tapes, etc. separate from the side sheets) are not constituent members of the “diaper body”.

  For example, a disposable diaper 301 shown in FIGS. 13A and 13B includes an absorbent body 322, and a diaper body 370 in which a top sheet 318, a side sheet 319, a back sheet 320, and a cover sheet 324 that cover the absorbent body 322 are integrally formed. I have. In the disposable diaper 301, the fastening tape 311, the front side flap 372 and the rear side flap 374 do not constitute the diaper main body 370.

[3-8] Various elastic materials:
In the disposable diaper of the present invention, it is preferable to arrange elastic materials such as a waist elastic material, a leg elastic material, and a tammy elastic material. As described above, a leg stretchable material or the like can be used as a stretchable material constituting the “stretchable portion” or “stretchable nonwoven fabric” according to the present invention.

[3-8a] Waist stretchable material:
A waist elastic material is an elastic material arrange | positioned at a waist covering part. A waist gather is formed in the waist envelope by the waist elastic material.

  It is preferable to arrange the waist stretchable material along the waist edge of the diaper. “Along” means being substantially parallel to the reference portion. That is, it is not necessary to be parallel in a strict sense. However, the waist stretchable material 242 shown in FIGS. 12A, 12D, and 12E is arranged to be parallel to the waist edge 202c of the front envelope portion 202 and the waist edge 206c of the rear envelope portion 206.

  In the case of a pants-type disposable diaper, as shown in FIGS. 12A, 12D, and 12E, a plurality of linear elastic materials are often used as the waist elastic material 242. In many cases, the waist stretchable material 242 is disposed on both the front enveloping portion 202 and the rear enveloping portion 206 along the waist end edges 202c and 206c. The waist elastic material 42 of the disposable diaper 1 shown in FIGS. 1A, 1D, and 1E also adopts the same configuration.

  On the other hand, in the case of a tape-type disposable diaper, a sheet-like elastic material (e.g., elastic foam) is often used as a waist elastic material. The waist elastic material may be arranged on both the front enveloping part and the rear enveloping part along the waist edge, or only on the rear enveloping part along the waist edge of the rear enveloping part. May be.

[3-8b] Leg elastic material:
A leg elastic material is an elastic material arrange | positioned at a crotch envelope part. Leg gathers are formed in the crotch envelope by the leg stretchable material.

  In the case of a pants-type disposable diaper, as shown in FIGS. 12A, 12B, and 12E, a plurality of linear elastic materials are often used as the leg elastic material 240. Further, in many cases, the leg stretchable material 240 is arranged in a curved manner along the outer edge of the leg opening 212 of the exterior body 216. In this embodiment, as shown in FIG. 12E, it is preferable that the leg stretchable material 240 is disposed so as not to cross the center of the crotch envelope portion 204 in the waist circumference direction. According to this embodiment, the contraction force of the leg stretchable material 240 is unlikely to act at the center of the crotch envelope portion 204 in the waist circumference direction. Therefore, twisting of the absorbent body 22 is prevented, and the absorbent body 22 is easily fitted to the wearer's inseam.

  In the disposable diaper 1 shown in FIGS. 1A, 1 </ b> B, and 1 </ b> E, leg elastic members 40 are linearly arranged on the crotch envelope portion 4 of the rear exterior body 65. The leg elastic member 40 is disposed so as to be parallel to the waist edge 65 c of the rear exterior body 65. In this structure, a portion of the rear exterior body 65 positioned at the crotch envelope portion 4 follows the contraction of the leg stretchable material 40 and contracts toward the side edge of the absorbent main body 14. Therefore, the said part deform | transforms into the shape along a wearer's leg periphery, and the fit property with respect to a wearer's leg periphery is improved.

  Moreover, the disposable diaper 1 shown to FIG. 1A, FIG. 1B, and FIG. 1E has arrange | positioned the leg elastic material 38 linearly along the both-sides edge of the absorber 22 in the absorptive main body 14. FIG. In such a form, the leg elastic members 38 and 40 and the tammy elastic material 44 of the front exterior body 62 are integrated to improve the fit to the wearer's leg.

  Moreover, when the leg elastic material 38 is arrange | positioned, when wearing a diaper, the both-sides edge of the absorptive main body 14 will be in the form which stood up rather than the absorber 22. FIG. Such a form makes it easy for urine to collect at the central portion in the width direction of the absorbent main body 14 (that is, the portion where the absorber 22 is disposed) after urination. Therefore, it is possible to make it difficult for urine leakage to occur.

  In the case of a tape-type disposable diaper, as shown in FIGS. 13B and 13D, a plurality of linear stretchable materials are often used as the leg stretchable material 340. In addition, a form in which a plurality of left and right pairs of linear elastic materials are linearly arranged at least in the crotch envelope portion 304 so as to follow both side edges of the absorbent body 322 is often adopted.

[3-8c] Tammy elastic material:
The Tammy stretchable material is a stretchable material that is disposed in the Tammy envelope. Tammy gathers are formed in the Tammy envelope by the Tammy elastic material. It is an elastic material that is mainly disposed in pants-type disposable diapers.

  In the case of a pants-type disposable diaper, as shown in FIGS. 12A, 12B, and 12E, a plurality of linear elastic materials are often used as the tammy elastic material 244. Further, in many cases, the Tammy stretchable material 244 is arranged linearly along the waist edge edges 202c and 206c and on both the front enveloping portion 202 and the rear enveloping portion 206. For the same reason as in the case of the leg stretchable material, it is preferable to arrange the Tammy stretchable material 244 so as not to cross the placement site of the absorber 22 as shown in FIG. 12E. The tammy stretchable material 44 of the disposable diaper 1 shown in FIGS. 1A, 1B and 1E also adopts the same configuration.

[3-8d] Configuration of elastic material, other:
As the stretchable material, a flat rubber made of natural rubber, a thread rubber made of an elastic thread of a synthetic rubber (urethane rubber, etc.) can be suitably used. Moreover, a stretchable net, a stretchable film, a stretchable foam (such as urethane foam), or the like can also be used.

  The stretchable material is preferably fixed in a stretched state of 120 to 400%, and is preferably fixed in a stretched state of 200 to 300%. By setting it as this range, sufficient stretching force can be applied without applying an excessive tightening force to the wearer. The stretchable material can be fixed by adhesion using an adhesive, welding by heat, ultrasonic waves, or the like. As the adhesive, a hot-melt adhesive or other highly fluid adhesive can be used. Examples of the welding method include heat sealing.

  The method for fixing the elastic material is not particularly limited. However, an adhesive may be applied to or sprayed on at least one of the stretchable material and the nonwoven fabric sheet sandwiching the stretchable material, and the like. Examples of the coating method include spiral coating.

  In the case of a pants-type disposable diaper, the waist stretchable material, the leg stretchable material, and the tammy stretchable material can be arranged by a method such as being fixed so as to be sandwiched between layers of a plurality of sheets constituting the exterior body.

  For example, in the disposable diaper 1 illustrated in FIG. 1D, the waist stretchable material 42 is fixed so as to be sandwiched between the pressing sheet 68 and the outer sheets 63 and 66. On the other hand, the disposable diaper 201 shown to FIG. 12D has fixed the waist elastic material 242 so that it may be inserted | pinched between the interlayer of the pressing sheet 268 and the outer sheet | seat 217. FIG.

  Moreover, in the disposable diaper 1 shown to FIG. 1E, the leg elastic material 40 and the tammy elastic material 44 are fixed so that it may be pinched | interposed between the inner sheets 61 and 64 and the outer sheets 63 and 66. On the other hand, in the disposable diaper 201 shown in FIG. 12E, the leg elastic member 240 and the tammy elastic member 244 are fixed so as to be sandwiched between the inner sheet 215 and the outer sheet 217.

  However, the leg stretchable material may be arranged by a method such as fixing it so as to be sandwiched between layers of a plurality of sheets constituting the absorbent main body. For example, the disposable diaper 1 shown in FIG. 1C has legs that are sandwiched between layers of the nonwoven fabric sheets 32 bonded to the absorbent main body 14 or between the nonwoven fabric sheet 32 and the cover sheet 24 to form a three-dimensional gather 26. The elastic material 38 is fixed.

  On the other hand, in the case of a tape-type disposable diaper, both the waist elastic material and the leg elastic material can be arranged by a method such as fixing them so as to be sandwiched between layers of a plurality of sheets constituting the diaper main body. For example, the waist elastic material can be fixed so as to be sandwiched between the back sheet and the cover sheet.

  Moreover, the disposable diaper 301 shown to FIG. 13B has fixed the leg elastic material 340 so that it may be pinched | interposed between the layers of the side sheet | seat 319 comprised by the nonwoven fabric sheet 332, and the cover sheet | seat 324. FIG. However, the leg stretchable material may be fixed so as to be sandwiched between the top sheet and the cover sheet.

[3-9] Fastening tape:
The “fastening tape” is a tape for fastening either one of the front encapsulation portion and the rear encapsulation portion to the other. Normally, like the fastening tape 311 shown in FIGS. 13A and 13D, the left and right side edges (side edges 374a and 374b of the rear side flaps) of the rear covering portion 306 extend outward in the waist direction. It is attached.

  The fastening tape preferably has a fastening member. The type of fastening member is not particularly limited. However, it is preferable to use a mechanical fastener (planar fastener). Mechanical fasteners are preferable in that they have a high fastening force, and the fastening force is unlikely to be lowered even when the detachment is performed a plurality of times. For example, as shown in FIGS. 13A and 13D, a hook material 348 of a mechanical fastener is attached in the vicinity of the tip of the base material 350 constituting the fastening tape 311. On the other hand, as shown in FIG. 13D, a front patch 313 made of a mechanical fastener loop material 346 is often attached to the front enveloping portion 302.

  The number of fastening tapes is not particularly limited. However, an appropriate number of fastening tapes may be provided in accordance with the dimensions of the wearer's body shape (specifically, the waist circumference, leg circumference, etc.). In general, a pair of disposable diapers for infants (one each on the left and right) is attached, and a pair of disposable diapers for adults (two on the left and two on the left) are attached.

  The disposable diaper of this invention is demonstrated more concretely, referring drawings. However, the disposable diaper of this invention includes all the disposable diapers provided with the invention specific matter, and is not limited to the following examples.

[Example 1]
As the disposable diaper of Example 1, a pants-type disposable diaper was manufactured. The specific structure was set to the structure of the disposable diaper 1 shown to FIG. 1A-FIG. 1E. This disposable diaper 1 is of an L size for infants, has a length in the front-rear direction of 485 mm, and the width of the front envelope part 2 and the rear envelope part 6 (between the side edges 2a and 2b, between the side edges 6a and 6b). Length) is 325 mm. The manufacturing method was performed by the steps shown in FIGS. 11A and 11B.

  In the disposable diaper 1, as shown in FIG. 1F and FIGS. 2A to 2C, the cell forming sheet 82 is disposed on the skin contact surface side of the stretchable portion 80, and the cell forming sheet 82 constitutes the stretchable portion 80. It is joined to the presser sheet 68 which is one non-woven fabric, and its joint 84 is formed in a zigzag shape toward the circumference of the diaper. As shown in FIG. 1B and FIG. 1D, the cell structure is formed not only on the rear envelope portion 6 side of the diaper but also on the front envelope portion 2 side.

In the disposable diaper 1, as shown in FIG. 1B and FIG. 1D, the cell forming sheet 82 uses the folded portion 88 of the outer sheets 63 and 66 constituting the front exterior body 62 and the rear exterior body 65. As the cell forming sheet 82, a spunbonded nonwoven fabric having a basis weight of 19 g / m ² is used.

  In the disposable diaper 1, one end of the outer sheets 63, 66 is folded back toward the top sheet 18 at the waist end edges 62c, 65c, whereby a folded portion 88 is formed. The length of the folded portion 88 in the front-rear direction is 80 mm.

As the pressing sheet 68, a non-woven fabric sheet separate from the inner sheets 61 and 64 and the outer sheets 63 and 66 is disposed. As the pressing sheet 68, a spunbond nonwoven fabric of the same type as the cell forming sheet 82, that is, a water-repellent nonwoven fabric having a basis weight of 19 g / m ² is used.

  As shown in FIGS. 1D and 1F, the front end of the pressing sheet 68 is configured to protrude from the front end of the folded portion 88. And the part of the absorptive main body 14 is coat | covered by the protrusion part. The protruding portion is configured to protrude by 40 mm from the end portion of the cell forming sheet 82 and is configured to cover a 25 mm portion from the end portion of the absorbent main body 14.

  The presser sheet 68 has a length of 80 mm (dimension in the longitudinal direction of the diaper), and a folded portion 88 is joined to the presser sheet 68. The joint portion 84 is formed so that the opening width of the opening end of the cell 86 is 8.5 mm and the depth of the cell is 38 mm, and this structure has a total of 76 outward cells and inward cells in the circumferential direction of the diaper. The structure was formed.

  As shown in FIG. 1D, the expansion / contraction part 80 extends the waist expansion / contraction material 42 between the pressing sheet 68 and the outer sheets 63, 66 along the waist end edges 62c, 65c at a stretch rate of 300% (3% of the original length). 6) in an expanded state. As the elastic waist member 42, a flat rubber made of natural rubber (thickness 0.35 mm × width 0.65 mm) was used.

[Example 2]
As the disposable diaper of Example 2, a pants-type disposable diaper was manufactured. The specific structure was the structure of the disposable diaper 201 shown in FIGS. 12A to 12E. This disposable diaper 201 has a length in the front-rear direction of 520 mm and a width of the rear envelope 6 (the length between the side edges 6a and 6b) of 380 mm.

  As the absorbent main body, the absorbent main body 14 having the same structure as the disposable diaper of Example 1 was used. The longitudinal length of the absorbent main body 14 was 420 mm. The three-dimensional gather stretchable material 36 and the leg stretchable material 38 were fixed only to a portion having a length of 260 mm in the front-rear direction of the crotch envelope portion 204. The exterior body 216 is not the front / rear separation type like the disposable diaper of Example 1, but an integrated type in which the front enveloping part, the crotch enveloping part, and the rear enveloping part are integrally formed. The width of the narrowest part (position of the end face of A-A ′) of the crotch envelope was 175 mm. The leg stretchable material 240 disposed on the exterior body 216 is arranged in a curved manner along the outer edge of the leg opening 212 of the exterior body 216.

  In the disposable diaper 201 shown in FIG. 12C, the cell forming sheet 282 is disposed on the skin contact surface side of the stretchable portion 280, and the cell forming sheet 282 is a nonwoven fabric sheet 32 that is one nonwoven fabric constituting the stretchable portion 280. The joint portion 284 is formed in a zigzag shape in a direction along the side edge of the crotch envelope portion.

In the disposable diaper 1 shown to FIG. 12C, the nonwoven fabric sheet different from the nonwoven fabric sheet 32 which comprises the three-dimensional gather 26 is used as the cell formation sheet 282. FIG. Specifically, a water-repellent SMS nonwoven fabric sheet having a basis weight of 15 g / m ² is used. The cell forming sheet had a width (dimension in the diaper circumference direction) of 17 mm and a length (diaper longitudinal dimension) of 420 mm. And it joined so that the front-and-rear end of a cell formation sheet might align with the front-and-rear end of an absorptive main body.

  As shown in FIG. 12B, the joint portion 284 is formed so that the opening width of the opening end of the cell is 6.5 mm and the depth of the cell is 15 mm, and this structure is along the side edge of the crotch envelope portion 204. A total of 80 inward cells and outward cells are formed.

  As shown in FIG. 12C, the stretchable portion 280 is formed by extending the three-dimensional gather stretchable material 36 along the upper end of the three-dimensional gather 26 between the base portion and the folded portion of the nonwoven fabric sheet 32 at a stretch rate of 300% (three times the original length). 3 are arranged in the extended state. As the three-dimensional gather stretchable material 36, a flat rubber (thickness 0.35 mm × width 0.65 mm) made of natural rubber was used.

Example 3
As Example 3, a tape-type disposable diaper 301 shown in FIGS. 13A to 13D was produced. This tape-type disposable diaper 301 is of L size for babies, and the diaper body 370 has a rectangular shape with a longitudinal length of 485 mm and a width of 230 mm.

  A rubber thread was placed as a leg stretch material 340 on the side edge of the diaper main body 370. The three leg elastic members 340 were arranged on the left and right sides at a pitch of 7 mm. It arrange | positioned so that the leg elastic material 340 distribute | arranged outermost may be located in the position of 7 mm from the side edges 370a and 370b of the diaper main body 370. FIG. The leg stretchable material 340 was fixed between the side sheet 319 and the cover sheet 324 in a stretched state of 300% to constitute the stretchable portion 380.

A cell forming sheet 382 was bonded to the skin contact surface of the side sheet 319. The width of the cell forming sheet 382 was 26 mm. The joint part 384 was formed in a zigzag shape in a direction along the side edges of the crotch envelope part 304 (side edges 370a and 370b of the diaper main body 370). The width of the joint portion 384 was 0.4 mm. The cell forming sheet 382 is made of a spunbond nonwoven fabric, and a polypropylene nonwoven fabric sheet having a basis weight of 18 g / m ² was used. The cell forming sheet 382 was bonded to the skin contact surface of the side sheet 319 with an ultrasonic seal. The joint portion 384 is formed so that the opening width of the opening end portion of the cell is 6 mm and the depth of the cell is 25 mm, and this structure has 80 pieces in the direction along the side edge of the crotch envelope portion 204 (outward cell 40). And 40 inward cells).

A stretchable nonwoven fabric 396 was intermittently joined to the skin contact surface in the vicinity of the waist edge 370c, 370d of the diaper main body 370 toward the waist of the diaper. As the nonwoven fabric sheets 397 and 398 constituting the stretchable nonwoven fabric, a water-repellent SMS nonwoven fabric sheet having a basis weight of 15 g / m ² was used. Between the nonwoven fabric sheets 397 and 398, ten thread rubbers as an elastic material 399 were arranged at a pitch of 5 mm and fixed in a stretched state of 300%.

  The stretchable nonwoven fabric 396 was joined to the skin contact surface in the vicinity of the waist edge 370c, 370d of the diaper body 370 with an ultrasonic seal (joint portion 386). That is, the part (waist covering part) vicinity of the waist edge 370c, 370d of the diaper main body 370 was utilized as a cell formation sheet. The joint portion 385 is formed so that the opening width of the opening end of the cell is 8.5 mm and the depth of the cell is 30 mm, and this structure has 36 pieces (18 outward cells) in the direction along the circumference of the diaper. , 18 inward cells).

  The disposable diaper of the present invention can be used as a disposable diaper for infants or adults such as elderly people and persons with disabilities who need care, more specifically as a pants-type disposable diaper or a tape-type disposable diaper.

1: Disposable diaper, 2: Front enveloping part, 4: Crotch enveloping part, 6: Rear enveloping part, 7, 8: Joint part, 10: Waist opening part, 12: Leg opening part, 14: Absorbent body 16: exterior body, 18: top sheet, 20: back sheet, 22: absorber, 24: cover sheet, 26: solid gather, 28: joint, 32: non-woven sheet, 36: solid gather stretchable material, 38, 40: Leg elastic material, 42: Waist elastic material, 44: Tammy elastic material, 54: Upper tissue, 56: Lower tissue, 64, 61: Inner seat, 62: Front exterior body, 62a, 62b: Side edge, 62c: Waist edge, 66, 63: outer sheet, 65: rear exterior body, 65a, 65b: side edge, 65c: waist edge, 67, 69, 71, 73, 75: non-woven sheet, 68: pressing sheet, 78: Exposed area, 0: Stretchable part, 82, 82A, 82B, 82C, 82D, 82E, 82F: Cell forming sheet, 84, 84A, 84B, 84C, 84D, 84E, 84F: Joint part, 86, 86A, 86B, 86C, 86D, 86E, 86F: Cell, 88: Folded part, 89: Slit, 201: Disposable diaper, 202: Front enveloping part, 202a, 202b: Side edge, 202c: Waist edge, 204: Inseam enveloping part, 206: Rear Encapsulation part, 206a, 206b: side edge, 206c: waist edge, 207, 208: joint part, 210: waist opening part, 212: leg opening part, 215: inner sheet, 216: exterior body, 217: outer sheet 240: Leg stretchable material, 242: Waist stretchable material, 244: Tammy stretchable material, 268: Presser sheet, 280: Stretchable portion, 282 Cell forming sheet, 284: joint, 301: disposable diaper, 302: front envelope, 304: crotch envelope, 306: rear envelope, 311: fastening tape, 313: front patch, 318: top sheet 319: Side sheet, 320: Back sheet, 322: Absorber, 324: Cover sheet, 326: Solid gather, 332: Non-woven sheet, 336: Solid gather elastic material, 340: Leg elastic material, 342: Waist elastic material, 346: Loop material, 348: Hook material, 350: Base material, 370: Diaper body, 370a, 370b: Side edge, 370c, 370d: Waist edge, 372: Front side flap, 374: Rear side flap, 374a, 374b : Side edge, 380, 381: stretchable part, 382: cell forming sheet, 384, 385: joint part, 386: Cell, 396: stretchable nonwoven fabric, 397, 398: nonwoven fabric sheet, 399: stretchable material.

Claims (6)

A front enveloping part and a rear enveloping part that enclose the wearer's torso, and an inseam enveloping part in which an absorber is arranged and encapsulates the inseam of the wearer;
In at least one part of the front enveloping part, the rear enveloping part and the crotch enveloping part, an elastic part made of an elastic nonwoven fabric is formed,
The stretchable part is formed so as to contract in at least one of a direction along the circumference of the trunk and a direction along a side edge of the crotch envelope part,
A cell-forming sheet made of a nonwoven fabric is arranged on a part of the skin contact surface in the portion where the stretchable part is formed,
A joining part for joining the cell forming sheet and the stretchable part is formed,
A cell extending in a crossing direction intersecting with a shrinking direction of the stretchable part is defined between the cell forming sheet and the stretchable part by the joint part.
A disposable diaper, wherein the cell is a non-penetrating cell having one end opened and the other end closed.   As the cell, an outward cell in which an end portion closer to the outer space of the diaper is opened and an end portion far from the outer space of the diaper is closed by the joint portion, and an end portion farther from the outer space of the diaper The disposable diaper according to claim 1, wherein an inward cell in which an end of the diaper close to the outer space is closed by the joint is formed. A cell row in which a plurality of cells are arranged in parallel in the contraction direction is formed,
The disposable diaper according to claim 2, wherein in the cell row, the outward cells and the inward cells are alternately arranged. The joint is a zigzag or wavy joint that is continuous in the contraction direction,
The disposable diaper according to claim 3, wherein the outward cells and the inward cells are alternately partitioned by the joint portion. A cell row in which a plurality of cells are arranged in parallel in the contraction direction is formed,
The cell row is arranged in a plurality of stages toward the intersecting direction,
A portion extending in the intersecting direction among the junctions forming the cells in one cell row, and a portion extending in the intersecting direction among the joints forming the cells in the cell row adjacent to the one cell row. The disposable diaper according to any one of claims 1 to 4, wherein the plurality of cell rows are arranged so as not to be arranged on a straight line.   The plurality of cell rows are arranged so that an extension line of a portion extending in the intersecting direction among the joints that form the cells in one cell row passes through the cells in the cell row adjacent to the one cell row. The disposable diaper according to claim 5.

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