JP2012210318A - Disposable diaper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a disposable diaper which is excellent in stretch properties, flexibility and cushioning properties at a side-edge part (a circumferential edge of a leg opening for example) of a crotch cover section of the diaper, and is easy to produce with a good feeling of wear.SOLUTION: The disposable diaper includes: a front cover section and a rear cover section for covering the waist of a wearer; and a crotch cover section with an absorber disposed therein for covering the crotch of the wearer. Stretchable sections 80 made of stretchable nonwoven cloth are formed at least in the right and left side-edge parts of the crotch cover section. The stretchable sections 80 are configured so as to stretch and contract in the direction along the side edge of the crotch cover section. A ventilation passage forming sheets 82 made of water-repellent nonwoven cloth are disposed on portions of a skin contact surface of the crotch cover section. The ventilation passage forming sheets 82 are laid on the stretchable sections 80 in a stretch state. The ventilation passage forming sheets 82 and the stretchable sections 80 in a stretch state are joined with joints 84 formed intermittently along the stretch direction of the stretchable sections 80.

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, the stretchable stretch material is fixed along the side edge of the portion covering the crotch (for example, along the periphery of the leg opening). This stretchable material is fixed for the purpose of improving a feeling of wearing and fitting and preventing excrement from leaking from 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) Especially when the periphery of the leg opening is hard, not only the wearer's own skin but also the finger of the person performing the replacement work may be damaged. There was a problem.

  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. The pants-type absorbent article is proposed in which the elastic members are arranged so as not to pass through the joints 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. 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.

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 are formed by shrinking the outer layer sheet and the inner layer sheet in the waist circumferential direction by an elastic member to form a plurality of ridges. And it is thought that the convex curved surface formed of the said wrinkles gives volume in the thickness direction of an exterior sheet and an inner layer sheet | seat, and is aiming at improving the softness | flexibility, cushioning property, etc. of an elastic material arrangement | positioning part.

  However, the above structure is a special structure in which an elastic member is arranged so as not to pass through the intermittent joint portion between the exterior sheet and the inner layer sheet. In this structure, the elastic member is not restricted by any of the exterior sheet and 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 above-described problems of the prior art, and is provided with stretchability, flexibility, and cushioning at the side edge portion of the diaper crotch envelope portion (for example, the peripheral edge portion of the leg opening). The present invention provides a disposable diaper that is excellent in properties, can be easily manufactured, and provides a comfortable wearing feeling.

  As a result of intensive studies to solve the problems of the prior art as described above, the present inventor 1) Elasticity in which the elastic material and the nonwoven fabric behave integrally with at least the side edge of the crotch enveloping part of the diaper. Forming a stretchable portion made of nonwoven fabric, 2) forming a stretchable portion so as to shrink in a direction along the side edge of the crotch enveloping portion, and 3) at least a part of the skin contact surface of the crotch enveloping portion Arrange the airflow path forming sheet made of water-repellent nonwoven fabric, 4) Laminate the airflow path forming sheet on the stretched stretchable part, and intermittently connect the airflow path forming sheet and the stretched stretchable part toward the shrinkage direction of the stretchable part Thus, the present invention has been completed by conceiving that an air passage structure that functions as a cushion is formed at the edge portion of the crotch enveloping portion of the diaper, thereby solving the above-mentioned problems. Specifically, the following disposable diapers are provided by the present invention.

[1] A front enveloping part and a rear enveloping part enclosing the circumference of the wearer's torso, an inseam enveloping part in which an absorber is arranged and encapsulating the wearer's inseam, and at least the inseam covering Stretchable portions made of stretchable nonwoven fabric are formed on the left and right side edge portions of the wrapping portion, and the stretchable portion is formed to shrink in a direction along the side edge of the crotch wrapping portion, and the crotch wrapping portion An air passage forming sheet made of a water-repellent nonwoven fabric is disposed on a part of the skin contact surface of the skin, and the air passage forming sheet is laminated on the stretchable portion of the stretched state, and the stretch of the stretched state with the airflow passage forming sheet The disposable diaper with which the part is joined by the junction part formed intermittently toward the shrinkage | contraction direction of the said expansion-contraction part.

[2] A stretchable portion made of a stretchable nonwoven fabric is formed at least on the end portion of the crotch envelope portion on the back envelope portion side, and the expandable portion contracts in a direction along the edge on the rear envelope portion side. An air passage forming sheet made of a water-repellent nonwoven fabric is arranged on a part of the skin contact surface at the end portion on the rear envelope side, and the air passage forming sheet is stretched in the stretched state. Disposable according to [1], wherein the ventilation path forming sheet and the stretched stretchable part are joined together by joints formed intermittently toward the shrinking direction of the stretchable part. Diapers.

[3] A stretchable portion made of a stretchable nonwoven fabric is formed at least on the end portion of the front envelopment portion on the crotch envelopment portion side, and the stretchable portion contracts in a direction along the edge on the crotch envelopment portion side. An air passage forming sheet made of a water-repellent nonwoven fabric is disposed on a part of the skin contact surface at the end on the crotch enveloping portion side, and the air passage forming sheet is stretched in the stretched state. Disposable according to [2], wherein the ventilation path forming sheet and the stretched stretchable part are joined together by joints formed intermittently toward the shrinking direction of the stretchable part. Diapers.

[4] Stretchable part formed on a side edge of the crotch enveloping part, stretchable part formed at an end of the front enveloping part on the crotch enveloping part side, and the rear in the crotch enveloping part At least one of the stretchable parts formed at the end part on the side of the enveloping part is continuously arranged to form a leg stretchable part surrounding the leg of the wearer, and the air passage forming sheet is stretched Laminated on the leg stretchable part in a state, and the vent path forming sheet and the stretched leg stretchable part are joined by joints formed intermittently toward the contraction direction of the leg stretchable part. The disposable diaper according to [3].

[5] The stretchable portion includes a stretchable stretch material disposed between layers of the plurality of nonwoven fabric sheets, and the stretchable material is fixed to the plurality of nonwoven fabric sheets, and the plurality of nonwoven fabric sheets and the stretchable material. The disposable diaper according to any one of the above [1] to [4], wherein is one-piece behavior.

[6] In any one of the above [1] to [4], in the stretchable portion, the stretchable film is fixed to the nonwoven fabric sheet, and the nonwoven fabric sheet and the stretchable film behave integrally. The disposable diaper described.

[7] A joint in which the ventilation path forming sheet and the stretchable part are formed intermittently in the shrinking direction of the stretchable part and continuously in a direction orthogonal to the shrinking direction of the stretchable part. The disposable diaper according to any one of [1] to [6], which is joined by a portion.

[8] The ventilation path forming sheet and the stretchable part are joined by joints that are intermittently formed in both directions of the shrinkage direction of the stretchable part and the direction orthogonal to the shrinkage direction of the stretchable part. The disposable diaper according to any one of [1] to [6].

  The disposable diaper of the present invention is excellent in stretchability, flexibility and cushioning properties of the side edge part of the crotch envelopment part of the diaper (for example, the peripheral edge part of the leg opening part), can be easily manufactured, and is comfortable to wear. Can be obtained.

It is a schematic plan view which shows typically one Embodiment of the disposable diaper of this invention. FIG. 1B is a schematic end view schematically showing an A-A ′ cut end surface of the disposable diaper shown in FIG. 1A. It is a schematic back view of the disposable diaper shown to FIG. 1A. 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. 1D. It is a schematic plan view which expands and shows typically the form of the junction part of the disposable diaper shown to FIG. 1A, and shows the state which peeled the ventilation path formation sheet. It is a schematic plan view which expands and schematically shows another form of the joined part of a disposable diaper, and shows the state where an air passage formation sheet was exfoliated. It is a schematic plan view which expands and shows typically another form of the junction part of a disposable diaper, and shows the state which peeled the ventilation path formation sheet. It is the schematic plan view which expands and shows typically another form of the junction part of a disposable diaper, and shows the state which peeled the ventilation path formation sheet. It is a schematic plan view which shows typically another embodiment of the disposable diaper of this invention. It is a schematic end view schematically showing an A-A ′ cut end surface of the disposable diaper shown in FIG. 3A. FIG. 3B is a schematic end view schematically showing an A-A ′ cut end face of the disposable diaper shown in FIG. 3A in use. It is a general | schematic end elevation which shows typically another embodiment of the disposable diaper of this invention. It is a figure which shows the cut end surface corresponding to the cut end surface shown to FIG. 3C in a use condition. It is a schematic end view which shows still another embodiment of the disposable diaper of this invention typically. It is a figure which shows the cut end surface corresponding to the cut end surface shown to FIG. 3C in a use condition. It is a perspective view showing typically another embodiment of the disposable diaper of the present invention. FIG. 5B is a schematic plan view schematically showing a state where the disposable diaper shown in FIG. 5A is developed and viewed from the top sheet direction. FIG. 5B is a schematic end view schematically showing an A-A ′ cut end surface of the disposable diaper shown in FIG. 5B. FIG. 5B is a schematic end view schematically showing a B-B ′ cut end surface of the disposable diaper shown in FIG. 5B. It is the schematic plan view which shows typically the state which expand | deployed the disposable diaper shown to FIG. 5A, and was seen from the outer sheet | seat direction. It is a perspective view showing typically another embodiment of the disposable diaper of the present invention. FIG. 6B is a schematic plan view schematically showing a state where the disposable diaper shown in FIG. 6A is developed and viewed from the top sheet direction. FIG. 6B is a schematic end view schematically showing an A-A ′ cut end surface of the disposable diaper shown in FIG. 6B. FIG. 6B is a schematic end view schematically showing a B-B ′ cut end surface of the disposable diaper shown in FIG. 6B. FIG. 6B is a schematic plan view schematically illustrating a state where the disposable diaper illustrated in FIG. 6A is developed and viewed from the outer sheet direction.

  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 of the present invention, like the disposable diaper 1 shown in FIG. 1A and FIG. 1C, is arranged with the front enveloping part 2 and the rear enveloping part 6 that enclose the circumference of the wearer, and the absorber 22. The crotch enveloping part 4 encapsulates the crotch of the wearer.

[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 shape in which one waist opening 510 and a pair of left and right leg openings 512 are formed in advance, like a disposable diaper 501 shown in FIG. 5A.

  The disposable diaper 501 shown in FIGS. 5B and 5E has a cylindrical structure in which the side edges 562a and 562b of the front exterior body 562 and the side edges 565a and 565b of the rear exterior body 565 are joined to each other to surround the wearer's torso. It is a formed form. In such a form, the cylindrical structure is formed by the region between the left and right joints 507 and 508 in the exterior body 516. Therefore, the region is referred to as a front enveloping portion 502 or a rear enveloping portion 506.

  In the disposable diaper 501 shown in FIGS. 5A, 5B, and 5E, the exterior body 516 includes a front exterior body 562 and a rear exterior body 565. 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, the disposable diaper 601 shown in FIG. 6B and FIG. 6E has a cylindrical shape in which the side edges 602a, 602b and the side edges 606a, 606b of the integrally formed exterior body 616 are joined together to surround the wearer's torso. This is a form in which a structure is formed. In such a form, the cylindrical structure is formed by the region between the left and right joints 607 and 608 in the exterior body 616. Therefore, the region will be referred to as a front encapsulation portion 602 or a rear encapsulation portion 606.

  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.

  The “pseudo-pants type” means a joint 507, 508 or joint 607 in the same form as the disposable diaper 501 shown in FIGS. 5A, 5B and 5E or the disposable diaper 601 shown in FIGS. 6A, 6B and 6E. , 608 instead of a detachable fastener (mechanical fastener or the like).

  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 1 shown in FIGS. 1A and 1C, 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 74 a, 74b) refers to a disposable diaper to which a fastening tape 11 is attached so as to extend from 74b).

  As shown in FIGS. 1A and 1C, the “tape type” has a fastening member (in the illustrated example, a hook material 48 of a mechanical fastener) on a base material 50 constituting the fastening tape 11. Therefore, the tubular structure surrounding the wearer's torso is formed by fastening to the fastening member (the loop member 46 of the mechanical fastener forming the front patch 13 in the illustrated example) that encloses the front side of the wearer. 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 having wide front and rear waist edges and a narrow constriction on the crotch side, a shape similar to the exterior body 616 shown in FIG. 6B), 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”.

  As shown in the disposable diaper 1 shown in FIGS. 1A and 1C, a rear side flap 74 separate from the diaper main body 70 is provided on the waist end edge 70c side of the diaper main body 70, and also on the waist end edge 70d side. When the front side flap 72 is provided separately from the diaper main body 70, a straight line connecting the intersections of the front side flap 72 and the side edges 70a and 70b of the diaper main body 70 on the diaper crotch side, The area between the end edge 70d is the "front enveloping part", the straight line connecting the intersections of the rear side flap 74 and the side edges 70a, 70b of the diaper main body 70 on the diaper crotch side, and the waist end edge 70c 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 FIGS. 1A and 1C, a crotch envelope portion 4 is formed by a diaper main body 70. Then, a straight line connecting the intersections of the front side flap 72 and the side edges 70a and 70b of the diaper main body 70 on the diaper crotch side, and an intersection of the rear side flap 74 and the side edges 70a and 70b of the diaper main body 70 on the diaper crotch side. The area between the straight lines connecting each other is the crotch envelope portion 4.

  In the disposable diaper 501 shown in FIG. 5D, the absorbent main body 514 is disposed and joined so as to be bridged between the front exterior body 562 and the rear exterior body 565 (joint portion 528). In this form, the front covering portion 502 is formed by the front outer covering body 562, the rear covering portion 506 is formed by a part of the rear outer covering body 565, and the crotch covering is formed by a part of the rear outer covering body 565 and a part of the absorbent main body 514. A packet part 504 is formed. The absorber 522 is disposed as a constituent member of the absorbent main body 514.

  In the disposable diaper 601 shown in FIG. 6B, a crotch wrapping portion 604 is formed by the absorbent main body 514 and the exterior body 616. An area between the straight line connecting the constriction starting points on the side of the waist edge 602c on the side edge of the exterior body 616 and the straight line connecting the constriction starting points on the side of the waist end edge 606c is the crotch wrapping portion 604. .

[2] Characteristic configuration of the disposable diaper of the present invention:
The disposable diaper of the present invention is, as in the disposable diaper 1 shown in FIGS. 1A to 1C, 1) a stretchable nonwoven fabric in which a stretchable material and a nonwoven fabric behave integrally with at least a side edge portion of the crotch wrapping portion 4 of the diaper. 2) The stretchable part 80 is formed so as to shrink in the direction along the side edges of the crotch envelope 4 (in this example, the side edges 70a, 70b of the diaper body 70). 3) An air passage forming sheet 82 made of a water-repellent nonwoven fabric is disposed on at least a part of the skin contact surface of the crotch enveloping portion 4 and 4) The air passage forming sheet 82 is in an expanded state. It is laminated on the stretchable portion 80, and is characterized in that the airflow passage forming sheet 82 and the stretchable stretchable portion 80 are joined by a joint portion 84 joined intermittently in the shrinking direction of the stretchable portion 80. It is.

  In such a disposable diaper, as shown in FIGS. 1D and 1E, the distance between the joint portions 84 of the air passage forming sheet 82 is narrowed by contraction of the stretchable portion 80. As a result, the air passage forming sheet 82 is bent and deformed into a corrugated shape, and the portions other than the joint portion 84 (non-joined portions) of the air passage forming sheet 82 and the stretchable portion 80 are separated from each other, and function as a vent pipe and a cushion. A ventilation path 86 is formed.

  The air passage 86 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.

  Further, when the wearer takes a sitting position from a standing position, the diaper is compressed from the outside, and moisture in the inner space of the diaper passes through the ventilation path 86 and is discharged to the outer space. Furthermore, when the wearer walks, the crotch enveloping part of the diaper is deformed by the movement of the leg, so that the moisture in the internal space of the diaper is discharged to the external space by the deformation, and the air in the external space is exchanged for this. It flows into the inner space of the diaper. Therefore, the inner space of the diaper can be made a comfortable environment.

[2-1] Expansion / contraction part:
The stretchable part is made of a stretchable nonwoven fabric. “Stretchable nonwoven fabric” means that the nonwoven fabric itself has stretchability, or that stretches the nonwoven fabric by joining stretchable materials (elastic materials such as rubber and thermoplastic elastomer) to the nonwoven fabric that is the base material. Means something.

  For example, a commercially available elastic nonwoven fabric, elastomer spunbond nonwoven fabric, etc. can be used. 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.

  However, as the stretchable nonwoven fabric, it is not always necessary to use a stretchable fabric as described above. It can also be configured by appropriately combining and joining a nonwoven fabric and an elastic material. That is, the stretchable nonwoven fabric is disposed between the layers of the nonwoven fabric sheets, the stretchable stretch material is disposed, the stretchable material is fixed to the nonwoven fabric sheets, and the plurality of nonwoven fabric sheets and the stretchable material behave integrally. You may do. For example, a stretchable nonwoven fabric having a structure in which stretched stretchable materials are fixed between layers of a plurality of nonwoven fabric sheets can be given. 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.

  The stretchable nonwoven fabric may be one in which the stretchable film is fixed to the nonwoven fabric sheet and the nonwoven fabric sheet and the stretchable film behave integrally. Such a stretchable nonwoven fabric also has the same effect as a stretchable nonwoven fabric having a structure in which stretched stretchable materials are fixed between layers of a plurality of nonwoven fabric sheets. In the stretchable nonwoven fabric of this form, the nonwoven fabric sheet is fixed to at least one surface of the stretchable film. Nonwoven fabric sheets may be fixed on both sides of the stretchable film.

  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 separately provide the stretchable nonwoven fabric, and the stretchable portion may be configured by using a part of the structure of the conventional disposable diaper as the stretchable nonwoven fabric.

  In the disposable diaper 1 shown in FIG. 1B, an extended leg elastic member 40 is disposed between the side sheet 19 and the back sheet 20 or between the side sheet 19 and the cover sheet 24 constituting the diaper main body 70. ing. The stretchable elastic material 40 is fixed to the side sheet 19, the backsheet 20 and the cover sheet 24, and is a stretchable nonwoven fabric (stretchable part) that behaves integrally by the sidesheet 19, the backsheet 20, the cover sheet 24 and the leg stretchable material 40. 80) is configured.

  In the disposable diaper 201 shown in FIG. 3C, a stretched three-dimensional gather elastic member 237 is disposed between the nonwoven fabric sheet 233 and the base 279 of the non-woven fabric sheet 234 constituting the three-dimensional gather 227. The three-dimensional gather stretchable material 237 is fixed to the nonwoven fabric sheet 233 and the base portion 279, and the non-woven fabric sheet 233, the base portion 279 and the three-dimensional gather stretchable material 237 constitute a stretchable non-woven fabric (stretchable portion 281).

  On the other hand, in the disposable diaper 501 shown in FIG. 5C, a stretched three-dimensional gather elastic material 536 is disposed between the base and the folded portion of the nonwoven fabric sheet 532 constituting the three-dimensional gather 526. The three-dimensional gather stretchable material 536 is fixed to the base and the folded portion of the nonwoven fabric sheet 532, and a stretchable nonwoven fabric (stretchable portion 581) that behaves integrally is formed by the base of the nonwoven fabric sheet 532, the folded portion, and the three-dimensional gather stretchable material 536. Has been.

  The stretchable part is formed so as to shrink in the direction along the left and right side edges of the crotch envelope. For example, the disposable diaper 1 shown in FIG. 1B is formed with a stretchable portion 80 so as to shrink in a direction along the side edges 70a and 70b of the diaper main body 70 constituting the crotch envelope portion. Moreover, the disposable diaper 501 shown to FIG. 5C has the expansion-contraction part 581 so that it may shrink | contract in the direction in alignment with the side edge of the absorptive main body 514 which comprises a crotch envelope part. The disposable diaper 601 shown in FIG. 6C also has an expansion / contraction part 581 having the same structure as the disposable diaper 501 shown in FIG. 5C.

  “Forming to shrink in the direction along the side edge of the crotch envelope” means that the stretchable nonwoven fabric is stretched along the side edge of the crotch envelope along the side edge of the crotch envelope. It means that the stretchable nonwoven fabric is arranged so that the shrinkage force acts. As the simplest structure, like the disposable diaper 1 shown in FIG. 1C, a linear elastic material (in this example, a leg) along the side edges of the crotch envelope part 4 (side edges 70a and 70b of the diaper main body 70). The structure which arrange | positions the elastic material 40) can be mentioned.

  However, the configuration shown in FIG. 1C is not limited as long as the stretchable nonwoven fabric contracts in the direction along the side edge of the crotch envelope. For example, the elastic material may be arranged so as to draw a curve that protrudes to the left or protrudes to the right with respect to the direction along the side edge of the crotch envelope.

  In the disposable diaper of this invention, the said expansion-contraction part should just be formed in the left-right side edge part of the crotch envelope part. However, the said expansion-contraction part may be formed in the other part. By joining the air passage forming sheet intermittently to the stretchable part, flexibility can be imparted similarly to the left and right side edge parts of the crotch envelope part.

  For example, as shown in FIG. 5E, an expansion / contraction part 580 made of an elastic nonwoven fabric is formed at least on the end part of the crotch enveloping part 504 on the back enveloping part 506 side, and the expanding / contracting part 580 is an end on the back enveloping part 506 side. When it is formed so as to shrink in the direction along the edge, as shown in FIG. 5B, an air passage forming sheet made of a water-repellent nonwoven fabric on a part of the skin contact surface at the end portion on the rear envelope 506 side 583 is preferably disposed. The ventilation path forming sheet 583 is laminated on the expansion / contraction part, and the ventilation path forming sheet 583 and the expansion / contraction part are joined by the joint part 585 formed intermittently toward the contraction direction of the expansion / contraction part, thereby forming the crotch encapsulating. An air passage structure can also be formed at the end of the portion 504 on the back envelope portion 506 side.

  In addition, as shown in FIG. 5E, an expansion / contraction part 580 made of an elastic nonwoven fabric is formed at least on the end part on the crotch enveloping part 504 side in the front enveloping part 502, and the expansion / contraction part 580 is an end on the crotch enveloping part 504 side When formed so as to shrink in a direction along the edge, as shown in FIG. 5B, an air passage forming sheet made of a water-repellent nonwoven fabric on a part of the skin contact surface at the end on the crotch wrapping portion 504 side 583 is preferably disposed. The air passage formation sheet 583 is laminated on the stretched stretchable portion, and the airflow passage forming sheet 583 and the stretched stretchable portion are joined by a joint portion 585 that is intermittently formed in the contraction direction of the stretchable portion. Thus, an air passage structure can also be formed at the end portion of the front enveloping portion 502 on the crotch enveloping portion 504 side.

  Furthermore, like a disposable diaper 501 shown in FIGS. 5A to 5E, an expansion / contraction part 581 formed on a side edge of the crotch enveloping part 504 and an end part of the front enveloping part 502 on the crotch enveloping part 504 side. The leg that surrounds the wearer's leg and is continuously arranged with at least one of the formed stretchable part 580 and the stretchable part 580 formed at the end of the crotch enveloped part 504 on the rear enveloped part 506 side. It is preferable that a stretchable part is formed. The air passage forming sheets 582 and 583 are stacked on the stretched leg stretchable portion, and the airflow passage forming sheets 582 and 583 and the stretched leg stretchable portion are intermittently formed in the contraction direction of the leg stretchable portion. By being joined by the joint portions 584 and 585, the air passage structure of the crotch envelope portion 504 and the air passage structure of the front envelope portion 502 and / or the rear envelope portion 506 are continuously arranged. Such a structure is preferable because flexibility can be imparted to the leg stretchable part.

[2-2] Ventilation path forming sheet:
In the disposable diaper of the present invention, an air passage forming sheet 82 made of a water-repellent nonwoven fabric is disposed on a part of the skin contact surface of the crotch enveloping part 4 like the disposable diaper 1 shown in FIG. 1A. The ventilation path forming sheet 82 forms a ventilation path structure that functions as a ventilation pipe and a cushion near the leg opening of the diaper.

  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 air passage forming sheet to occur.

  “Partial” means that the ventilation path forming sheet may not be disposed on the entire skin contact surface of the crotch envelope. There is no particular limitation on the portion where the air passage forming sheet is disposed. However, as shown to FIG. 1A, it is preferable to arrange | position to the left-right side edge part (In this example, side edge 70a, 70b of the diaper main body 70) at least as for the crotch envelope part 4. FIG. In that case, as shown to FIG. 1A, it is preferable to arrange | position so that 60% or more of the full length (length between waist edge 70c, 70d) of the diaper main body 70 may be covered.

The basis weight of the air passage 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 the adhesive that fixes the stretchable material may permeate the sheet and ooze out. On the other hand, if it exceeds 50 g / m ² , 1) the sheet stiffness is too high and it becomes difficult to bend in conjunction with the contraction of the elastic material, making it difficult to form an air passage structure. There is a risk that the side edge of the encapsulated part (such as the part that abuts around the leg of the wearer) will become stiff and the feeling of wear will be reduced.

  In the disposable diaper 401 shown in FIG. 4B, the air passage forming sheet is configured as an independent member like the air passage forming sheet 482. However, the ventilation path forming sheet does not need to be configured as an independent member. For example, in the disposable diaper 201 shown in FIG. 3C, a part of the nonwoven fabric sheet 234 constituting the stretchable nonwoven fabric (stretchable part 281) is folded to form a folded part, and the folded part is used as the air passage forming sheet 283. .

  Moreover, in the disposable diaper 301 shown to FIG. 4A, a part of nonwoven fabric sheet 333 which comprises the three-dimensional gather 327 is utilized as the ventilation path formation sheet 383. FIG. Also in the disposable diaper 401 shown in FIG. 4B, a part of the nonwoven fabric sheet 433 constituting the three-dimensional gathers 26 and 427 is used as the air passage forming sheet 483. In the disposable diaper 301 shown in FIG. 4A and the disposable diaper 401 shown in FIG. 4B, folded portions 378, 379, 478, 479 are formed on the nonwoven fabric sheets 333, 433, and the stretched portion 381 is formed by the folded portions 378, 379, 478, 479. , 481 is also used as a nonwoven fabric sheet.

  The air passage forming sheet may be formed with a hole for communicating the inner space of the diaper with the air passage formed by the air passage forming sheet. With such a structure, moisture flows from the inner space of the diaper into the ventilation path via the hole, and the moisture is discharged to the outer space of the diaper through the ventilation path.

  The “hole” means an opening that allows communication between the internal space of the diaper and the air passage, 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, a hole having a tongue piece that functions as a valve can be formed by forming slits having convex trajectories or a plurality of intersecting slits on the ventilation path forming sheet. The tongue piece allows moisture to pass through while preventing urine and body fluid from entering the ventilation path.

  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.

  It is preferable that the hole is formed in a portion where the air passage is formed (that is, the region between the joint portions) in the air passage formation sheet. In particular, when the air passage forming sheet 283 is formed by the folded portion of the nonwoven fabric sheet 234 as in the disposable diaper 201 shown in FIG. 3C, a hole is formed in the vicinity of the tip of the folded portion. Furthermore, it is preferable that the portion near the tip of the folded portion is joined to the stretchable portion. 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 hole becomes the end opening of the air passage. Therefore, the moisture in the diaper internal space flows into the ventilation path from the forcibly opened hole, passes through the ventilation path, and passes through the folding line (the upper edge of the three-dimensional gather 227 in the example of FIG. 3C). It passes through the path forming sheet and is discharged to the outer space of the diaper. Such a configuration is preferable in that moisture easily flows into the air passage and moisture is easily discharged outside the diaper, compared to a structure in which holes are formed in the air passage forming sheet.

  Further, a plurality of holes may be formed in the air passage 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 the number to 200 or less, it is possible to effectively prevent urine and body fluid from flowing into the ventilation path.

  It is also a preferred form that a chemical is adhered to the air passage forming sheet. By attaching the drug, the medicinal effect based on the drug can be imparted to the air passage forming sheet that is in direct contact with the wearer's skin.

  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] Joint part:
In the disposable diaper of the present invention, as shown in FIG. 1D and FIG. 1E, the air passage forming sheet 82 is laminated on the stretchable stretchable portion 80, and the airflow passage forming sheet 82 and the stretched stretchable portion 80 are stretched. It joins by the joining part 84 formed intermittently toward the direction along the shrinkage direction.

  With this structure, the distance between the joint portions 84 of the air passage forming sheet 82 is reduced following the contraction of the stretchable portion 80, and the inner space and the outer space of the diaper are communicated with the side edge portion of the crotch envelope portion. A ventilation path 86 is formed. The ventilation path 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.

  The “stretchable stretchable portion” means a stretchable portion in a state where a shrinkage force is acting on the stretchable nonwoven fabric. By intermittently joining the air passage formation sheet to the stretched stretchable portion, the airflow passage forming sheet can be bent as the stretchable portion contracts. Accordingly, an air passage can be formed between the stretchable portion and the air passage forming sheet.

  A stretchable nonwoven fabric, an elastic nonwoven fabric, or an elastomer spunbond nonwoven fabric, etc., in which a stretchable film is fixed to a nonwoven fabric sheet, is in a full-scale state in a natural state (a state where no tension is applied), and a shrinkage force is not acting. . Therefore, about these elastic nonwoven fabrics etc., a ventilation path formation sheet is joined in the state extended from the original size. On the other hand, a stretchable nonwoven fabric in which stretched stretchable materials are disposed between layers of a plurality of nonwoven fabric sheets is in a state of being shrunk from its original size in a natural state, and no shrinkage force is acting. Therefore, such a stretchable nonwoven fabric or the like is joined to the air passage forming sheet in a state of being stretched from the contracted state.

  Bonding of the stretchable part and the airflow path forming sheet is performed by joining the surface of the stretchable nonwoven fabric constituting the stretchable part and the airflow path forming sheet. That is, the stretchable material or stretchable film disposed between the layers of the nonwoven fabric sheet and the air passage forming sheet are not directly joined.

  “Intermittently” means that the joint is formed discontinuously or intermittently. In this joined state, the stretchable part and the air passage forming sheet are inseparable from each other at the joined part. On the other hand, in the non-joined portion, the stretchable portion and the airflow passage forming sheet are not restrained each other and can be freely separated.

  In the present invention, the air gap is formed by contracting the gap portion between one joining portion and the other joining portion in the air passage forming sheet or the stretchable portion. Therefore, it is preferable that the space | interval of joining parts shall be 2-50 mm toward the direction along the side edge of a crotch envelope part, and it is especially preferable to set it as 5-10 mm.

  Note that “intermittent” may be intermittent with respect to the contraction direction of the stretchable portion. That is, there is no particular limitation as to what shape the joining portion is formed in the direction orthogonal to the shrinking direction of the stretchable portion. However, it is preferable that the joint portion is continuously formed in a direction orthogonal to the contraction direction of the stretchable portion. Such a form can form an effective air passage in a direction perpendicular to the contraction direction, and is excellent in touch. For example, a joint portion formed continuously in a direction orthogonal to the contraction direction of the stretchable part and intermittently formed at regular intervals with respect to the contraction direction of the stretchable part can be given.

  In the disposable diaper 1 shown in FIG. 1B, an air passage forming sheet 82 is joined to the nonwoven fabric sheet 32 (side sheet 19) constituting the stretchable portion 80 (stretchable nonwoven fabric) (joint portion 84). FIG. 1F is a schematic plan view schematically showing an enlarged form of the joint portion 84 of the disposable diaper 1 shown in FIGS. 1A and 1B, and schematically shows a state where the air passage forming sheet 82 is peeled from the disposable diaper 1. FIG.

  As shown to FIG. 1F, the junction part 84 consists of the several linear junction part 90 which goes to the trunk periphery direction (left-right direction of drawing) of a diaper. And the linear junction part 90 is intermittently formed toward the direction in alignment with the side edge (side edge 70a of the diaper main body 70) of a crotch envelope part. Further, each of the linear joint portions 90 is a form in which a plurality of dot-shaped joint portions 92 are formed as an aggregate arranged in a row in the circumferential direction of the diaper.

  In the example shown to FIG. 1F, the linear junction part 90 is orientating toward the trunk periphery direction of a diaper. Therefore, compared with the case where it is oriented in the direction along the side edge of the crotch enveloping part, moisture or the like tends to flow in the front-rear direction, and the side edge of the crotch enveloping part (the side edge 70a of the diaper main body) Exhaust of moisture and the like from the side can be promoted. Moreover, it is easy to make a diaper follow the curved shape around a wearer's leg, and it is excellent also in a fitting property and a feeling of wear.

  In the present specification, the term “linear” widely includes shapes extending in the circumferential direction of the diaper, and includes shapes such as strips and strips in addition to so-called linear shapes. In addition, in order for a plurality of dot-like joints to be recognized as an “aggregate”, it is necessary that the distance between adjacent dot-like joints be 5 mm or less.

  Moreover, the form shown to FIG. 2A is the same as the form shown to FIG. 1F, and the structure of an expansion-contraction part is the same, and the form of a junction part is different. The joint portion 84A is composed of a plurality of linear joint portions 90A that go in the direction of the diaper trunk. And 90 A of linear junction parts are intermittently formed toward the direction along the side edge (side edge 70a of a diaper main body) of a crotch envelope part. Furthermore, the linear joint 90A is formed as an aggregate of circular dot joints 92A. Therefore, in addition to the effect of the form shown in FIG. 1F, there is an effect that it is difficult to cause pain even when the joint portion 84A, which is likely to have a hard touch, hits the skin.

  Also, the configuration shown in FIG. 2B is the same as the configuration shown in FIG. The joint portion 84B is composed of a plurality of linear joint portions 90B that go in the diaper torso direction. And the linear junction part 90B is intermittently formed toward the direction in alignment with the side edge (side edge 70a of a diaper main body) of a crotch envelope part.

  Further, each of the linear joint portions 90B includes a plurality of dot-shaped joint portions 92B in n rows in the diaper circumference direction, and in m rows in a direction along the side edge of the crotch envelope portion (side edge 70a of the diaper main body). , N <m, and is formed as an aggregate arranged in a matrix. In this form, by setting “n <m”, more dot-shaped joint portions 92B are arranged in the waist circumference direction in each linear joint portion 90B than in the direction along the side edge of the crotch envelope portion. And it forms in the shape of a line where the trunk circumference direction is longer than the direction along the side edge of the crotch enveloping part.

  In the example shown in FIG. 2B, the linear joint 90B is formed as an aggregate of circular dot-shaped joints 92B, and the dot-shaped joints 92B are formed as an aggregate arranged in a matrix of 2 rows and 5 columns. Has been.

In the above-described form, it is preferable to form 1 to 30 linear joint portions having a width of 1 to 4 mm and a length of 2 to 80 mm in the length direction. Each linear joint is a set in which dot joints having an area of 1 to 4 mm ² are arranged in a matrix at intervals of 0.5 to 5 mm in the width direction and at intervals of 0.5 to 3 mm in the length direction. The body is preferable.

  In FIG. 2A and FIG. 2B, it demonstrated by the example which formed the linear junction part as an aggregate | assembly of a dot-like junction part. However, as shown in FIG. 2C, the joint formed intermittently in the direction along the side edge of the crotch envelope (the side edge 70a of the diaper main body) and continuously in the direction around the waist of the diaper. It is also preferable that it is the part 84C (linear joining part 90C). The configuration shown in FIG. 2C is the same as the configuration shown in FIG.

  Especially, it is formed so as to be orthogonal to the direction along the side edge of the crotch enveloping part (the side edge 70a of the diaper main body) like the joint part 84C, and the ventilation path is arranged in a direction crossing the side edge of the crotch enveloping part. Are preferred. In this embodiment, the air passage communicates the inner space and the outer space of the diaper at the side edge of the crotch envelope. Therefore, sufficient ventilation can be achieved.

  In the said form, the junction part is formed in the linear form extended in the trunk periphery direction of a diaper. Therefore, it is preferable in that exhaust of moisture and the like from the side edge of the crotch envelope part (side edge 70a of the diaper body) is promoted. From the same idea, when forming a plurality of joints in the circumferential direction of the diaper, it is preferable to form the plurality of joints in a line so that the joints are on a straight line extending in the circumferential direction of the diaper. (The form shown in FIGS. 2A and 2B). By forming the joint portion in this way, it becomes easy to form a linear air passage that is continuous in the diaper torso direction. Such a structure is preferable in that the air passage formed is not easily crushed and the air permeability is easily improved.

  In the disposable diaper of the present invention, the air passage forming sheet and the stretchable part are joined by a joint part formed intermittently in both the direction around the waist of the diaper and the direction along the side edge of the crotch envelope part. It is also preferable.

  For example, a plurality of dot-like joints may be arranged in a staggered manner. Even in such a configuration, the air passage forming sheet bends following the contraction of the expansion and contraction portion, and an air passage that connects the internal space and the external space of the diaper is formed. Therefore, the air permeability and flexibility of the side edge part of the crotch envelope part, which are the effects of the present invention, can be obtained.

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

[2-4a] 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, an air passage structure can be formed in a leg elastic material arrangement part by intermittently joining an air passage formation sheet to an extended leg elastic material arrangement part.

  For example, the disposable diaper 1 shown in FIG. 1B has a structure of a stretchable nonwoven fabric (stretchable portion 80) in which a stretchable leg stretchable material 40 is fixed between the side sheet 19 and the cover sheet 24. That is, the stretchable part 80 is formed in a region between the fixed end (lower end) of the three-dimensional gather 26 and the side edges of the crotch envelope part 4 (side edges 70a and 70b of the diaper main body 70). And it is an example which joined the air passage formation sheet 82 intermittently to this expansion-contraction part 80 (joining part 84). The joint portion 284 shown in FIG. 3C, the joint portion 384 shown in FIG. 4A, and the joint portion 484 shown in FIG. 4B have the same form.

  A disposable diaper 501 shown in FIG. 5C has a structure of a stretchable nonwoven fabric (stretchable portion 580) in which a stretchable leg stretchable material 538 is fixed between layers of the nonwoven fabric sheets 532. That is, the stretchable part 580 is formed in a region between the fixed end (lower end) of the three-dimensional gather 526 and the side edge of the crotch envelope part 504 (side edge of the absorbent main body 514). And it is an example which joined the air passage formation sheet 582 intermittently to this expansion-contraction part 580 (joint part 584).

[2-4b] 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, an air passage structure can be formed in the three-dimensional gather elastic material arrangement part by intermittently joining an air passage formation sheet to the stretched three-dimensional gather elastic material arrangement part.

  For example, in the disposable diaper 501 illustrated in FIG. 5C, a three-dimensional gather 526 is formed by a part of the nonwoven fabric sheet 532. Moreover, it has a structure of a stretchable nonwoven fabric (stretchable portion 581) in which a stretched three-dimensional gather stretchable material 536 is fixed between the base portion and the folded portion of the nonwoven fabric sheet 532. That is, the stretchable portion 581 is formed in a region between the fixed end (lower end) and the free end (upper end) of the three-dimensional gather 526. And it is an example which joined the air passage formation sheet 582 intermittently to this expansion-contraction part 581 (joining part 584).

  In the disposable diaper 201 shown in FIG. 3C, a three-dimensional gather 227 is formed by a part of the nonwoven fabric sheet 233. Moreover, it has a structure of a stretchable nonwoven fabric (stretchable portion 281) in which a stretched three-dimensional gather stretchable material 237 is fixed between the nonwoven fabric sheet 233 and the nonwoven fabric sheet 234. That is, the stretchable part 281 is formed in a region between the fixed end (lower end) and the free end (upper end) of the three-dimensional gather 227. And it is an example which joined the air passage formation sheet 283 intermittently to this expansion-contraction part 281 (joining part 285). The joint portion 385 shown in FIG. 4A and the joint portion 485 shown in FIG. 4B have the same form.

  In the disposable diaper 201 shown in FIG. 3C, the air passage forming sheet 283 is joined only to the three-dimensional gather 227, and the air passage forming sheet is not joined to the three-dimensional gather 26 (arrangement portion of the three-dimensional gather elastic member 36). . However, an air passage forming sheet may be joined to the three-dimensional gather 26 (arrangement part of the three-dimensional gather expansion / contraction material 36).

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

  The disposable diaper of this invention can be manufactured by methods, such as joining an airflow path formation sheet | seat intermittently with respect to the member which comprises the skin contact surface of a crotch envelope part, for example. About another part, it can manufacture according to the manufacturing method of a general disposable diaper. Hereinafter, it demonstrates by the example in the case of manufacturing the disposable diaper 1 shown to FIG. 1A-FIG. 1E.

[2-5a] Joining of the ventilation path forming sheet:
One side edge of the nonwoven fabric sheet 32 (the side edge on the side that becomes the three-dimensional gather 26) is folded back, and the stretched three-dimensional gather stretchable material 36 is sandwiched between the base and the folded portion, and fixed with a hot melt adhesive or the like. Then, the three-dimensional gather 26 is formed. On the other hand, the air passage forming sheet 82 is joined to the other side edge portion (side edge portion on the side that becomes the side sheet 19) of the nonwoven fabric sheet 32 to form the joint portion 84. In the illustrated example, the joining portion 84 is formed by heat sealing. And the joining part 84 is intermittently formed toward the front-back direction (drawing up-down direction) of a diaper intermittently toward the trunk periphery direction (drawing left-right direction) of a disposable diaper.

[2-5b] Formation of topsheet composite:
A front side flap 72 and a rear side flap 74 are bonded to the other side edge portion of the nonwoven fabric sheet 32 to which the air passage forming sheet 82 is intermittently bonded with a hot melt adhesive or the like. The fastening tape 11 is joined to the side edge of the rear side flap 74 by heat sealing or the like. This structure will be referred to as a “top sheet composite”.

[2-5c] Formation of backsheet composite:
A structure in which the back sheet 20 is bonded to the center of the cover sheet 24 in the width direction and a waist stretchable material 42 is bonded to the back sheet 20 is formed using a hot melt adhesive or the like. This structure will be referred to as a “backsheet composite”.

[2-5d] Formation of absorber complex:
The absorber 22 is encapsulated by upper and lower tissues not shown. This structure will be referred to as an “absorber complex”. For example, the upper tissue and the lower tissue may be arranged in the same manner as the absorber 522, the upper tissue 554, and the lower tissue 556 shown in FIGS. 5C and 5D.

[2-5e] Manufacture of disposable diapers:
The absorbent body composite is disposed at the center in the width direction of the backsheet composite, and the stretched leg elastic member 40 is disposed at the side edge of the backsheet composite in the width direction. Under the present circumstances, the hot-melt-adhesive etc. for fixing the said absorber composite body and the said absorber composite body are applied.

  The adhesion of the leg stretchable material 40 is as follows: 1) A hot melt adhesive is continuously applied to the back sheet 20, the cover sheet 24 or the side sheet 19, and the leg stretchable material 40 is placed in an extended state on the coated portion; 2) A method in which a hot melt adhesive is directly applied or sprayed on the leg elastic 40, and the leg elastic 40 is bonded in an extended state. 3) Leg expansion / contraction on the upper portion of the back sheet 20 and the cover sheet 24. A method in which the material 40 is placed in an expanded state, and a hot melt adhesive is sprayed in that state, and the hot melt adhesive is adhered to both the back sheet 20, the cover sheet 24, and the leg stretchable material 40, 4 ) The leg elastic 40 is placed in an extended state on the surface of the back sheet 20 and the cover sheet 24, and the hot melt adhesive is not sprayed in that state. Continuously coated, the back sheet 20, both of the cover sheets 24 and the leg stretchable members 40 to adhere the hot-melt adhesive can be carried out by a method such as bonding. By such a method, the back sheet 20, the cover sheet 24, and the side sheet 19 that sandwich the leg elastic member 40 are bonded to each other on a continuous surface.

  “Consecutively coating” in these forms includes not only a form in which the adhesive is solid-coated or sprayed on the entire surface of the nonwoven fabric sheet but also a form in which the adhesive is applied in a spiral shape. That is, it is only necessary that the joining portion is continuously formed in the direction along the side edge of the crotch envelope portion. Even when any one of the methods 1) to 4) is adopted, the joint portion is continuously formed in the direction along the side edge of the crotch envelope portion. Accordingly, a continuous air passage toward the waist of the diaper is not formed between the back sheet 20, the cover sheet 24, and the side sheet 19 constituting the stretchable part 80. On the other hand, the air passage is formed between the side sheet 19 and the air passage forming sheet 82.

  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, summit, etc. The bonding method 4) can be carried out by techniques such as omega coat and summit. The omega coat can be performed by using, for example, an omega nozzle head (manufactured by ITW Dynatech), and the summit can be performed by using, for example, a summit nozzle (manufactured by Nordson).

  The top sheet composite is bonded to the back sheet composite in which the absorbent composite and the leg elastic member 40 are disposed. Thereby, an absorber composite and the leg elastic material 40 are fixed between the layers of a top sheet composite and a back sheet composite. In this way, the disposable diaper 1 can be manufactured.

  The series of steps as described above can be continuously performed by mechanical means. For example, it is possible to continuously manufacture a large number of disposable diapers by adopting a method / apparatus such as continuously feeding a long sheet material from a roller.

[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. 1A and FIG. 1B. 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 FIGS. 5C and 5D, the absorbent body 522 is entirely encapsulated by an upper tissue 554 and a lower tissue 556 that are hydrophilic sheets. The absorber 22 shown in FIGS. 1A and 1B has the same structure. That is, the entire absorber 22 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 absorber 22 shown in FIGS. 1A and 1B is an example using a rectangular absorber. The “absorber” is usually covered with the top sheet 18 on the front surface side and the back sheet 20 on the back surface side like the absorber 22 shown in FIG. 1B. That is, as shown in FIG. 1B, 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. 1A and 1B, a top sheet 18 made of a liquid-permeable material may be disposed only at the center of the diaper around the trunk. At this time, a configuration is often adopted in which a side sheet 19 made of a breathable 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 a tape-type disposable diaper, as shown in FIG. 1B and FIG. 1C, the cover sheet 24 is often bonded to the outer surface side of the back sheet 20. The cover sheet 24 is used to reinforce the back sheet 20 and improve the touch (feel) of the back sheet 20.

  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. 1B, a structure composed of a nonwoven fabric sheet 32 and having a structure in which a stretched three-dimensional gather stretchable material 36 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. 1A and 1B, 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. A disposable diaper 201 shown in FIGS. 3A to 3C is an example in which a three-dimensional gather 227 is arranged in addition to the three-dimensional gather 26 on both sides of the absorbent body 22. In this embodiment, the three-dimensional gathers 26 located on the inner side of the diaper around the trunk mainly contact the wearer's crotch portion to prevent side leakage. On the other hand, the three-dimensional gather 227 located on the outer side in the diaper torso direction mainly contacts the wearer's leg to prevent side leakage (sometimes referred to as “three-dimensional leg gather”).

  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. 5C, a nonwoven fabric sheet 532 that exclusively forms a three-dimensional gather is used, and this is attached to the absorbent main body 514, and the three-dimensional gather 526 is configured integrally with the absorbent main body 514. It is often the form to do. On the other hand, in the case of a tape-type disposable diaper, as shown in FIG. 1B and FIG.

[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 an absorbent main body 514 shown in FIGS. 5C and 5D, a top sheet 518 that covers the surface of the absorbent body 522 and a back sheet 520 that covers the back surface of the absorbent body 522 are formed at the peripheral edge of the absorbent body 522. A structure in which an absorbent body 522 is included between the layers of the top sheet 518 and the back sheet 520 that are bonded together can be given. The absorbent main body 514 shown in FIGS. 6B to 6D has the same structure as the absorbent main body 514 shown in FIGS. 5A to 5E.

[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.

  An exterior body 516 shown in FIG. 5A includes a front exterior body 562 and a rear exterior body 565 that enclose the circumference of the wearer's torso. And it exhibits the underpants type in which one waist opening 510 and a pair of leg opening 512 were formed integrally with the absorptive main body 514. 6A includes a front enveloping portion 602, a crotch enveloping portion 604, and a rear enveloping portion 606, and the exterior body 616 alone has one waist opening 610 and a pair of legs. It presents a pants shape in which an opening 612 is formed.

  In the exterior bodies 516 and 616, an engaging fastener member is attached in place of the joint portions 507 and 508 (joint portions 607 and 608), and it is possible to obtain a pants type by engaging the fastener members with each other. 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 516 illustrated in FIG. 5D is configured by a laminated body in which two or more nonwoven fabrics (an inner sheet 564, 561, an outer sheet 566, 563, a pressing sheet 568) are bonded together. The exterior body 616 shown in FIGS. 6B to 6D is also configured by a laminated body in which two or more nonwoven fabrics (an inner sheet 615, an outer sheet 617, and a pressing sheet 668) 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, the disposable diaper 1 shown in FIGS. 1A and 1B includes a diaper main body 70 in which an absorbent body 22 and a top sheet 18, a side sheet 19, a back sheet 20, and a cover sheet 24 that cover the absorbent body 22 are integrally formed. I have. In the disposable diaper 1, the fastening tape 11, the front side flap 72, and the rear side flap 74 do not constitute the diaper main body 70.

[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 42 shown in FIGS. 1A and 1C is arranged to be parallel to the waist end edges 70c and 70d.

  In the case of a pants-type disposable diaper, as shown in FIGS. 6A, 6B, and 6E, a plurality of linear elastic materials are often used as the waist elastic material 642. Further, the waist stretchable material 642 is often disposed on both the front enveloping portion 602 and the rear enveloping portion 606 along the waist end edges 602c and 606c. The waist elastic material 542 of the disposable diaper 501 shown in FIGS. 5A, 5B and 5E also adopts the same configuration.

  On the other hand, in the case of a tape-type disposable diaper, as shown in FIGS. 1A and 1C, a sheet-like elastic material (such as an elastic foam) is often used as the waist elastic material 42. In the disposable diaper 1 shown in FIG. 1A and the like, waist elastic members 42 are disposed on both the front envelope part 2 and the rear envelope part 6 along the waist edge 70c, 70d. However, you may arrange | position a waist elastic material only in a back envelope part along the waist edge of a back envelope part.

[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. 6A, 6B, and 6E, a plurality of linear elastic materials are often used as the leg elastic material 640. In addition, a configuration in which the leg stretchable material 640 is arranged in a curve along the outer edge of the leg opening 612 of the exterior body 616 is often employed. In this embodiment, as shown in FIG. 6E, it is preferable that the leg stretchable material 640 is arranged so as not to cross the center of the crotch envelope part 604 in the waist circumference direction. According to this embodiment, the contraction force of the leg stretchable material 640 hardly acts on the center of the crotch envelope 604 in the waist direction. Therefore, twisting of the absorbent body 522 is prevented, and the absorbent body 522 is easily fitted to the wearer's crotch.

  In the disposable diaper 501 shown in FIG. 5E, leg elastic members 540 are linearly arranged on the crotch wrapping portion 504 in the rear exterior body 565. The leg elastic material 540 is disposed so as to be parallel to the waist edge 565c. In this structure, a portion of the rear exterior body 565 located at the crotch envelope 504 follows the contraction of the leg elastic member 540 and contracts toward the side edge of the absorbent main body 514. 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 501 shown to FIG. 5E has arrange | positioned the leg elastic material 538 linearly along the both-sides edge of the absorber 522 in the absorptive main body 514. As shown in FIG. In such a form, the leg elastic members 538 and 540 and the tammy elastic material 544 of the front exterior body 562 are integrated to improve the fit to the wearer's leg.

  Further, when the leg stretchable material 538 is disposed, the side edges of the absorbent main body 514 are likely to rise from the absorbent body 522 when the diaper is worn. Such a form makes it easy for urine to collect at the center in the width direction of the absorbent main body 514 (that is, the portion where the absorber 522 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 FIG. 1B and FIG. 1C, a plurality of linear elastic materials are often used as the leg elastic material 40. Further, in many cases, at least the crotch enveloping portion 4 adopts a form in which a plurality of left and right pairs of linear elastic members are linearly arranged along both side edges of the absorbent body 22.

[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. 6A, 6B, and 6E, a plurality of linear elastic materials are often used as the tammy elastic material 644. Further, in many cases, the Tammy stretchable material 644 is arranged linearly along the waist end edges 602c and 606c and on both the front envelope portion 602 and the rear envelope portion 606. For the same reason as in the case of the leg stretchable material, it is preferable to dispose the Tammy stretchable material 644 so as not to cross the site where the absorber 522 is disposed, as shown in FIG. 6E. The same configuration is adopted for the tammy stretchable material 544 of the disposable diaper 501 shown in FIGS. 5A, 5B, and 5E.

[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 501 shown in FIG. 5D, the waist stretchable material 542 is fixed so as to be sandwiched between the pressing sheet 568 and the outer sheets 563 and 566. On the other hand, the disposable diaper 601 shown in FIG. 6D has a waist stretchable material 642 fixed so as to be sandwiched between the pressing sheet 668 and the outer sheet 617.

  Moreover, in the disposable diaper 501 shown to FIG. 5E, the leg elastic material 540 and the Tammy elastic material 544 are being fixed so that it may be pinched | interposed between the inner sheets 561 and 564 and the outer sheets 563 and 566. On the other hand, in the disposable diaper 601 shown in FIG. 6E, the leg stretchable material 640 and the tammy stretchable material 644 are fixed so as to be sandwiched between the inner sheet 615 and the outer sheet 617.

  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 501 shown in FIG. 5C has a leg so as to be sandwiched between layers of the nonwoven fabric sheets 532 bonded to the absorbent main body 514 or between the nonwoven fabric sheet 532 and the cover sheet 524 to form a three-dimensional gather 526. An elastic material 538 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 stretchable material can be fixed so as to be sandwiched between the top sheet and the back sheet.

  Moreover, the disposable diaper 1 shown to FIG. 1B has fixed the leg elastic material 40 so that it may be pinched | interposed into the interlayer of the side sheet 19 comprised by the nonwoven fabric sheet 32, and the back sheet | seat 20. As shown in FIG. However, as shown in FIG. 1B, the leg stretchable material 40 may be fixed so as to be sandwiched between layers of the side sheet 19 and the cover sheet 24.

[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. Usually, like the fastening tape 11 shown in FIG. 1A, it is attached so as to extend from the left and right side edges (side edges 74a, 74b of the rear side flaps) of the rear envelope portion 6 outward in the waist direction. .

  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 FIG. 1A, a hook material 48 of a mechanical fastener is attached in the vicinity of the tip of the base material 50 constituting the fastening tape 11. On the other hand, as shown in FIG. 1C, a front patch 13 made of a loop material 46 of a mechanical fastener is often attached to the front envelope 2.

  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 Example 1, a tape-type disposable diaper 201 shown in FIGS. 3A to 3C was produced. This tape-type disposable diaper 201 is of L size for babies, and the diaper body 70 has a rectangular shape with a longitudinal length of 485 mm and a width of 230 mm.

  A rubber thread having a thickness of 620 dtex was disposed as a leg stretch member 40 on the side edge of the diaper main body 70. Three leg elastic members 40 were arranged on the left and right sides at a pitch of 5 mm. It arrange | positioned so that the leg elastic material 40 distribute | arranged to the outermost side may be located in the position of 10 mm from the side edges 70a and 70b of the diaper main body 70. FIG. The leg stretchable material 40 was fixed in a stretched state of 250% between the side sheet 19 and the back sheet 20 and between the side sheet 19 and the cover sheet 24 to form the stretchable portion 280.

A nonwoven fabric sheet 233 (ventilation path forming sheet 282) is intermittently bonded to the skin contact surface of the side sheet 19 in the direction along the side edges of the crotch envelope 4 (side edges 70a and 70b of the diaper body 70). did. The air passage forming sheet 282 was made of a spunbond nonwoven fabric, and a polypropylene nonwoven fabric sheet having a basis weight of 18 g / m ² was used. The ventilation path forming sheet 282 was joined to the skin contact surface of the side sheet 19 with an ultrasonic seal. More specifically, the joint portion 284 is formed by collectively forming a plurality of rectangular joint portions having a width of 0.4 mm and a length of 10 mm, and the rectangular joint portions are formed on the side edges of the crotch envelope portion 4. They were arranged at intervals of 7 mm along the direction along the circumference of the diaper and at intervals of 1 mm along the circumference of the diaper.

  Further, a three-dimensional gather 227 was formed by a part of the nonwoven fabric sheet 233. The length from the fixed end (lower end) to the free end (upper end) of the three-dimensional gather 227 was 30 mm. The three-dimensional gather 227 was provided with a rubber thread as the three-dimensional gather elastic material 237. The three-dimensional gather stretchable material 237 was arranged on the left and right sides at a pitch of 5 mm. It arrange | positioned so that the solid gathers expansion-contraction material 237 distribute | arranged to the free end side may be located in the position of 2 mm from the free end of the solid gather 227. FIG. A three-dimensional gather stretchable material 237 was fixed in a stretched state of 300% between the base 279 of the nonwoven fabric sheet 234 and the nonwoven fabric sheet 233 to constitute the stretchable portion 281.

A direction along the side edges of the crotch envelope 4 (side edges 70a and 70b of the diaper main body 70) is placed on the skin contact surface 20 mm from the free end of the three-dimensional gather 227. Was intermittently joined. The air passage forming sheet 283 was joined to the skin contact surface of the nonwoven fabric sheet 233 with an ultrasonic seal. The joint part 285 was formed in the same form as a rectangular joint part having the same shape as the joint part 284. As the nonwoven fabric sheets 233 and 234, water-repellent SMS nonwoven fabric sheets having a basis weight of 15 g / m ² were used.

  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: Inseam enveloping part, 6: Rear enveloping part, 11: Fastening tape, 13: Front patch, 18: Top sheet, 19: Side sheet, 20: Back Sheet, 22: Absorber, 24: Cover sheet, 26: Solid gather, 32: Non-woven sheet, 36: Solid gather elastic material, 40: Leg elastic material, 42: Waist elastic material, 46: Loop material, 48: Hook material , 50: base material, 70: diaper body, 70a, 70b: side edge, 70c, 70d: waist edge, 72: front side flap, 74: rear side flap, 74a, 74b: side edge, 80: stretchable part, 82: Airflow path forming sheet, 84, 84A, 84B, 84C: Joint part, 86: Airflow path, 90, 90A, 90B, 90C: Linear joint part, 92, 92A, 92B: Dot joint part, 201 Disposable diapers, 227: Solid gather, 233, 234: Non-woven sheet, 237: Solid gather stretchable material, 279: Base, 280, 281: Stretched portion, 282, 283: Airflow path forming sheet, 284, 285: Joined portion, 301 : Disposable diaper, 327: three-dimensional gather, 333: non-woven fabric sheet, 378, 379: folded portion, 381: stretchable portion, 383: air passage forming sheet, 427: three-dimensional gather, 433: non-woven fabric sheet, 478, 479: folded portion, 481: Stretchable part, 482, 483: Airflow path forming sheet, 501: Disposable diaper, 502: Front enveloping part, 504: Inseam enveloping part, 506: Rear enveloping part, 507, 508: Joint part, 510: Waist Openings, 512: Leg openings, 514: Absorbent body, 516: Exterior body, 518: Top sheet, 52 : Back sheet, 522: Absorber, 524: Cover sheet, 526: Solid gather, 528: Joint part, 532: Non-woven sheet, 536: Solid gather elastic material, 538, 540: Leg elastic material, 542: Waist elastic material, 544: Tammy elastic material, 554: Upper tissue, 556: Lower tissue, 564, 561: Inner seat, 562: Front exterior body, 562a, 562b: Side edges, 566, 563: Outer seat, 565: Rear exterior body, 565a , 565b: side edge, 565c: waist edge, 568: presser sheet, 580, 581: stretchable part, 582, 583: air passage forming sheet, 584, 585: joint part, 601: disposable diaper, 602: front covering Part, 602a, 602b: side edge, 602c, 606c: waist edge, 604: crotch envelope part, 606 : Rear enveloping part, 606a, 606b: Side edge, 606c: Waist edge, 607, 608: Joint part, 610: Waist opening part, 612: Leg opening part, 615: Inner sheet, 61616: Exterior body, 617: Outer sheet, 640: Leg elastic material, 642: Waist elastic material, 644: Tammy elastic material, 668: Presser sheet.

Claims (8)

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;
An elastic part made of a stretchable nonwoven fabric is formed at least on the left and right side edge parts of the crotch envelope part, and the elastic part is formed so as to contract in a direction along the side edge of the crotch envelope part,
An air passage forming sheet made of a water-repellent nonwoven fabric is disposed on a part of the skin contact surface of the crotch envelope,
The ventilation path forming sheet is laminated on the stretchable part in the stretched state,
A disposable diaper in which the air passage forming sheet and the stretched stretchable part are joined by joints formed intermittently in the shrinking direction of the stretchable part. A stretchable portion made of a stretchable nonwoven fabric is formed at least at the end of the crotch envelopment portion on the side of the back envelope portion, and the stretchable portion is formed to contract in a direction along the edge of the back envelope portion side. Has been
An air passage forming sheet made of a water-repellent nonwoven fabric is disposed on a part of the skin contact surface at the end of the back enveloping part,
The ventilation path forming sheet is laminated on the stretchable part in the stretched state,
The disposable diaper according to claim 1, wherein the ventilation path forming sheet and the stretched stretchable part are joined by joints formed intermittently in the shrinking direction of the stretchable part. A stretchable portion made of a stretchable nonwoven fabric is formed at least on the end portion of the front envelopment portion on the crotch envelopment portion side, and the stretchable portion is formed to contract in a direction along the end edge on the crotch envelopment portion side. Has been
An air passage forming sheet made of a water-repellent nonwoven fabric is arranged on a part of the skin contact surface at the end of the crotch enveloping part,
The ventilation path forming sheet is laminated on the stretchable part in the stretched state,
The disposable diaper according to claim 2, wherein the air passage forming sheet and the stretched stretchable portion are joined by joints formed intermittently in the shrinking direction of the stretchable portion. An expansion / contraction part formed at a side edge of the crotch enveloping part, an expansion / contraction part formed at an end of the front enveloping part on the crotch enveloping part side, and the back enveloping part in the crotch enveloping part At least one of the stretchable parts formed at the end on the side is continuously arranged, and a leg stretchable part surrounding the leg of the wearer is formed,
The ventilation path forming sheet is laminated on the stretched leg stretchable part,
The disposable diaper according to claim 3, wherein the ventilation path forming sheet and the stretched leg stretchable part are joined by a joint part formed intermittently in a contraction direction of the leg stretchable part.   The stretchable portion includes an stretchable stretch material disposed between layers of the plurality of nonwoven fabric sheets, the stretchable material is fixed to the plurality of nonwoven fabric sheets, and the plurality of nonwoven fabric sheets and the stretchable material are integrated. The disposable diaper according to any one of claims 1 to 4, wherein the disposable diaper behaves as follows.   The disposable diaper according to any one of claims 1 to 4, wherein the stretchable part has a stretchable film fixed to a nonwoven fabric sheet, and the nonwoven fabric sheet and the stretchable film behave integrally.   The ventilation path forming sheet and the stretchable part are joined by a joint part formed intermittently in the shrinking direction of the stretchable part and continuously in a direction orthogonal to the shrinking direction of the stretchable part. The disposable diaper according to any one of claims 1 to 6.   The said air passage formation sheet and the said expansion-contraction part are joined by the junction part formed intermittently toward both directions of the direction orthogonal to the contraction direction of the said expansion-contraction part and the contraction direction of the said expansion-contraction part. The disposable diaper as described in any one of -6.

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