JP2019025225A - Disposable wear and manufacturing method for the same - Google Patents

Abstract

To provide a simple elastic film expansion and contraction structure having a plurality of nonparallel expansion and contraction directions.SOLUTION: A disposable wear which includes an elastic film expansion and contraction structure 20X in which an elastic film 30 is laminated between a first sheet layer 20A and a second sheet layer 20B, and the first sheet layer 20A and the second sheet layer 20B are connected by a large number of connection parts aligned at an interval is such that: a region having the elastic film expansion and contraction structure 20X has an expansion and contraction region 80 elastically expanding and contracting together with the elastic film 30; the expansion and contraction region 80 has a single film part 85 containing the elastic film 30 in only one layer, and not having the other elastic member; and the single film part 85 is provided with a first region 51 expanding and contracting in a first direction D1, and second regions 52,53 positioned in a direction orthogonal to the first region 51 in the first direction D1, and expanding and contracting in second directions D2,D3 inclined to the first direction D1.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a disposable wearing article having an elastic film stretchable structure in which an elastic film is sandwiched between sheet layers.

  In disposable wearing articles such as disposable diapers and sanitary napkins, it is common to impart stretchability to appropriate places such as around the legs and around the trunk in order to improve fit to the body surface. As a technique for imparting stretchability, conventionally, a technique has been widely adopted in which a large number of elongated elastic members such as rubber thread are stretched in the longitudinal direction and fixed, but the surface fit is excellent. As a thing, the method of attaching an elastic film in the state extended | stretched in the elasticity provision direction is also proposed. (For example, see Patent Documents 1 to 3).

  An elastic structure in which the elastic film is sandwiched between sheet layers (hereinafter, also referred to as an elastic film elastic structure) has an elastic film between a first sheet layer whose elastic region is made of a nonwoven fabric or the like and a second sheet layer made of a nonwoven fabric or the like. And a plurality of joints in which the first sheet layer and the second sheet layer are arranged at intervals in the stretching direction and the direction orthogonal thereto, in a state where the elastic film is stretched in the stretching direction. Thus, it is joined through a through-hole formed in the elastic film or through the elastic film. In the natural length state, the stretchable region having such an elastic film stretchable structure is such that, as the elastic film contracts between the joints, the gap between the joints becomes narrow, and the joints in the first sheet layer and the second sheet layer A contraction ridge extending in a direction crossing the expansion / contraction direction is formed between the parts. On the other hand, when the elastic film is stretched between the joints when stretched, the spacing between the joints and the shrinkage wrinkles in the first sheet layer and the second sheet layer are widened, and the first sheet layer and the second sheet layer are completely developed. Elastic extension to the state becomes possible. This elastic film stretchable structure has an advantage that the through hole of the elastic film contributes to the improvement of the air permeability as well as the surface fit.

  However, since this elastic film stretchable structure has only the MD direction (machine direction) at the time of manufacture and is linear, it cannot exert a contracting force in an oblique direction such as a direction along the base of a leg in a diaper. It was a thing.

  On the other hand, the present applicant has proposed a stretchable structure that exerts an oblique shrinkage force by extending an elastic film obliquely and attaching it between the first sheet layer and the second sheet layer (Patent Document). 4).

  However, since the conventional film is manufactured by extending an elastic film in one direction, including the one described in Patent Document 4, the stretch direction is almost parallel in the single film portion including only one elastic film (the position in the stretch direction is If they are the same, the expansion / contraction direction is the same at any position in the orthogonal direction orthogonal to the expansion / contraction direction). For this reason, for example, when an elastic film stretchable structure is applied to a pants-type or tape-type disposable wearing article, the stretchability in the width direction at the waist portion is added by an elastic film, and the portion along the base of the leg is elongated. Although a solution such as adding an elastic member has been proposed (see Patent Document 5), there is a problem that the manufacturing process becomes complicated and the product structure becomes complicated.

JP-T-2004-532758 Japanese Patent No. 4987967 Japanese Patent No. 5292586 JP-A-2006-185266 Special table 2009-536845

  Therefore, a main problem of the present invention is to provide a simple elastic film stretchable structure having a plurality of non-parallel stretch directions.

Various aspects that have solved the above problems are as follows.
<First aspect>
An elastic film is laminated between the first sheet layer and the second sheet layer, and the first sheet layer and the second sheet layer are formed through a hole penetrating the elastic film at a plurality of joints arranged at intervals. Or having an elastic film stretchable structure joined via the elastic film,
In the disposable wearing article, the region having the elastic film stretchable structure has a stretchable region that elastically stretches with the elastic film.
The stretchable region has a single film portion that includes only one elastic film and does not have other elastic members. The single film portion includes a first region that stretches in a first direction and the first region with respect to the first region. A second region located in a direction orthogonal to the first direction and extending and contracting in a second direction oblique to the first direction,
A disposable wearing article characterized by the above.

(Function and effect)
The expansion / contraction region of this aspect is located in a direction perpendicular to the first direction with respect to the first region, a first region that expands / contracts in the first direction on a single film portion including only one elastic film, and And a second region that expands and contracts in an oblique second direction, and thus has a simple structure that does not use a plurality of elastic members, but has a plurality of non-parallel expansion and contraction directions. Therefore, the direction of expansion and contraction can be made different depending on the site of the disposable wearing article, and more appropriate fit can be ensured.

<Second aspect>
A front-rear torso part, a rear-body torso part, and an intermediate part located between the front and rear parts, or a front and rear separate exterior body;
It is attached to the exterior body, and includes an interior body that extends from the front body to the back body through the crotch part,
A pants-type disposable wear in which both sides of the exterior body in the front body and both sides of the exterior body in the back body are joined to form a side seal part, and a waist opening and a pair of left and right leg openings are formed. Goods,
At least one of the exterior body of the front body and the exterior body of the back body has the stretchable region at least on both sides in the width direction than the interior body, and the single film portion of the stretchable region is formed from the inside of the middle portion to the body. Extending around the circumference,
In the single film portion, the second region includes a portion along the base of the wearer's leg, and is provided so that the expansion and contraction direction is obliquely downward toward the center in the width direction. It is located on the waist opening side from the second region, and is provided so that the expansion / contraction direction is the width direction,
The disposable wearing article according to the first aspect.

(Function and effect)
In the pants-type disposable wearing article of the present aspect, due to the single film portion, a contraction force appears diagonally downward toward the center in the width direction at the portion along the base of the wearer's leg, and the width direction at the waist opening side than that Since the shrinkage force is expressed, the fitting property to the base of the leg and the circumference of the trunk is good.

<Third Aspect>
A tape-type disposable wear comprising a front body and a back body, and a connecting tape extending from both sides of the back body, the connecting tape having a connecting portion detachably connected to the front body Goods,
The connecting tape has the stretchable region,
The single film portion of the stretchable region has the first region above the middle in the vertical direction of the connecting tape, and the second region below the first region,
The first region is provided such that the expansion / contraction direction is the width direction, and the second region is provided so as to be obliquely upward toward the tip side of the connecting tape,
The disposable wearing article according to the first aspect.

(Function and effect)
In a tape-type disposable wearing article that is mounted by connecting a connecting tape extending from both sides of the rear body to the front body, providing an expansion / contraction region on the connecting tape is performed. In this case, the lower side of the connecting tape is a leg opening, and the leg opening can be deformed by expansion and contraction of the connecting tape. Here, if the second region that expands and contracts obliquely upward toward the distal end side of the connecting tape as in this aspect is provided below the middle of the connecting tape in the up-down direction, the connecting tape depends on the direction around the legs. Because it can expand and contract in the near direction, it has excellent fit around the legs. In addition, the first region having stretchability in the width direction also ensures fit in the waistline direction.

<Fourth aspect>
In the method for producing a disposable wearing article according to any one of the first to third aspects,
In forming the elastic film stretchable structure,
In a state where the elastic film is sandwiched between the first sheet layer and the second sheet layer while extending in the first direction, the elastic film penetrates through the elastic film at a plurality of spaced positions, or While joining the first sheet layer and the second sheet layer through an elastic film,
Prior to joining the first sheet layer and the second sheet layer, a slit or hole having a dimension in the orthogonal direction of 50 mm or more is formed in the middle of the orthogonal direction orthogonal to the first direction in the elastic film. , Leaving a continuous portion continuous in the first direction on both sides of the orthogonal direction than the slit or hole,
In the state where the elastic film having the slit or hole and the continuous portion is stretched in the first direction, the first sheet layer and the second sheet layer are joined.
The manufacturing method of the disposable wearing article characterized by the above-mentioned.

(Function and effect)
With such a method, prior to joining the first sheet layer and the second sheet layer, a slit or hole having a length in the orthogonal direction of 50 mm or more is formed in the middle of the elastic film in the orthogonal direction. A simple elastic film stretchable structure having a plurality of non-parallel stretch directions can be manufactured. That is, when the elastic film in which the slits or holes are formed is extended in the first direction, the slits or holes are expanded in the first direction and reduced in the orthogonal direction. Accordingly, the portion of the continuous portion adjacent to the end portion in the orthogonal direction of the slit or hole is pulled to the center side in the orthogonal direction of the slit or hole, and the continuous portion is not affected by the pull in the first direction. And a portion in which the extension direction is changed in the second direction toward the end of the slit or the hole in the orthogonal direction due to the influence of the tension. Therefore, after joining the first sheet layer and the second sheet layer in this state, when the extension force is released, the portion extended in the first direction at the time of joining becomes the first region that expands and contracts in the first direction. The portion extending in the two directions becomes a second region that expands and contracts in the second direction.

<Fifth aspect>
In the method for producing a disposable wearing article according to any one of the first to third aspects,
In forming the elastic film stretchable structure,
In a state where the elastic film is sandwiched between the first sheet layer and the second sheet layer while extending in the first direction, the elastic film penetrates through the elastic film at a plurality of spaced positions, or While joining the first sheet layer and the second sheet layer through an elastic film,
Prior to joining the first sheet layer and the second sheet layer, the length in the orthogonal direction is set in the middle of the orthogonal direction in the elastic film with a gap in both the first direction and the orthogonal direction. A plurality of slits or holes of 50 mm or more are arranged, leaving a first continuous portion continuous in the first direction on both sides in the orthogonal direction with respect to the arrangement region of the slits or holes, and the slits or holes Leaving a second continuous portion that is continuous in the first direction in the interval portion in the orthogonal direction of the slit or hole in the arrangement region;
The elastic film having the slit or hole and the first continuous portion and the second continuous portion is bonded in the first sheet layer and the second sheet layer in a state of being stretched in the first direction.
The manufacturing method of the disposable wearing article characterized by the above-mentioned.

(Function and effect)
By such a method, prior to joining the first sheet layer and the second sheet layer, the length in the orthogonal direction is spaced between the first direction and the orthogonal direction in the middle of the orthogonal direction in the elastic film. If a slit or hole having a diameter of 50 mm or more is formed, a simple elastic film stretchable structure having a plurality of non-parallel stretch directions can be produced as follows. That is, when the elastic film in which the slits or holes are formed is extended in the first direction, the slits or holes are expanded in the first direction and reduced in the orthogonal direction. Accordingly, the portion of the first continuous portion adjacent to the end portion in the orthogonal direction of the slit or hole is pulled toward the center side in the orthogonal direction of the slit or hole, and the first continuous portion is affected by the tensile force. First, a portion extending in the first direction and a portion in which the extending direction changes in an oblique direction (second direction) toward the end of the slit or the hole in the orthogonal direction due to the influence of the tension are formed.
On the other hand, in the second continuous portion, the portion adjacent to the end of the slit or hole located on one side across the continuous portion and the portion adjacent to the end of the slit or hole located on the other side are separated from each other. It is pulled in the opposite direction in the orthogonal direction. As a result, of the second continuous portion, the portion between the end of the slit or hole located on one side and the end of the slit or hole located on the other side across the second continuous portion is the second continuous It is in a state of extending in an oblique direction (second direction) connecting the end of the slit or hole located on one side and the end of the slit or hole located on the other side across the portion.
Therefore, after joining the first sheet layer and the second sheet layer in this state, when the extension force is released, the portion extended in the first direction at the time of joining becomes the first region that expands and contracts in the first direction. The portion extending in the two directions becomes a second region that expands and contracts in the second direction. In particular, in this aspect, since the tensile force in the opposite direction due to the deformation of the two slits or holes acts on the diagonally extended portion of the second continuous portion, the tensile force due to the deformation of one slit or hole acts. The inclination in the extension direction becomes deeper than the extension part in the oblique direction in the first continuous part.

<Sixth aspect>
A front-rear torso part, a rear-body torso part, and an intermediate part located between the front and rear parts, or a front and rear separate exterior body;
It is attached to the exterior body, and includes an interior body that extends from the front body to the back body through the crotch part,
A pants-type disposable wear in which both sides of the exterior body in the front body and both sides of the exterior body in the back body are joined to form a side seal part, and a waist opening and a pair of left and right leg openings are formed. A method for manufacturing an article, comprising:
The elastic film is continuously supplied in the MD direction, and the first sheet layer and the second sheet layer are continuously supplied in the MD direction on both the front and back sides, while the elastic film is extended in the MD direction. In a state of being sandwiched between the first sheet layer and the second sheet layer, the first sheet layer and the second sheet layer are penetrated through the elastic film or through the elastic film at a plurality of positions spaced apart from each other. A process of manufacturing an exterior body that integrally forms a part that becomes the exterior body of the front body and a part that becomes the exterior body of the back body by joining;
A manufacturing process of the interior body;
The part which becomes the exterior body of the front body after the part which becomes the exterior body of the front body and the part which becomes the exterior body of the back body, which are integrally formed by the manufacturing process of the exterior body, are cut out. And after dividing | segmenting into the part used as the exterior body of a back body, it is the same arrangement | positioning as the expansion | deployment state of the said disposable wearing article, and it conveys so that the width direction of a disposable wearing article may become MD direction, and space | interval is set to MD direction. And attaching the interior body manufactured in the manufacturing process of the interior body to form an interior assembly body in which the individual disposable wearing articles are continuous in the MD direction by assembling the interior body, ,
After the interior assembly is folded in the CD direction, the side seals are formed by joining a part that becomes the exterior body of the front body and a part that becomes the exterior body of the back body at the parts that are both sides of each disposable wearing article. Forming a portion, cutting a portion that becomes the outer body of the front body and a portion that becomes the outer body of the rear body at the boundary of each disposable wearing article, and obtaining individual disposable wearing articles, Including,
In the manufacturing process of the exterior body, as the elastic film, supply a single elastic film that extends from at least a part that becomes a waist part of the front body to a part that becomes a waist part of the back body,
Prior to joining the first sheet layer and the second sheet layer, out of the middle region of the elastic film in the CD direction, the first part serving as both side edges of the front body and both side edges of the back body, and The slit or hole having a dimension in the CD direction of 50 mm or more is formed in each of the second parts including the crotch part of the individual disposable wearing article,
Leaving the first continuous portion that continues in the MD direction outside the first portion in the CD direction, and the second continuous portion that continues in the MD direction between the first portion and the second portion in the CD direction; leave,
The manufacturing method of the disposable wearing article of a 5th aspect.

(Function and effect)
According to this aspect, the disposable wearing article of the third aspect can be manufactured.

  As described above, according to the present invention, there are advantages such as an elastic film stretchable structure having non-parallel stretchability.

It is a top view (inner surface side) of the underpants type disposable diaper of a deployment state. It is a top view (outer surface side) of the underpants type disposable diaper of a deployment state. It is a top view which shows only the principal part of the underpants type disposable diaper of an unfolded state. (A) is CC sectional drawing of FIG. 1, (b) is EE sectional drawing of FIG. It is AA sectional drawing of FIG. It is BB sectional drawing of FIG. (A) is a principal part top view of an expansion-contraction area | region, (b) is DD sectional drawing of (a), (c) is sectional drawing in a mounting state, (d) is sectional drawing in a natural length state. (A) Trace diagram of micrograph from plane direction of sample stretch region, (b) Trace diagram of high magnification micrograph from plane direction, (c) Trace diagram of high magnification micrograph from perspective direction. (A) is a principal part top view of an expansion-contraction area | region, (b) is DD sectional drawing of (a), (c) is sectional drawing in a mounting state, (d) is sectional drawing in a natural length state. (A) Trace diagram of micrograph from plane direction of sample stretch region, (b) Trace diagram of high magnification micrograph from plane direction, (c) Trace diagram of high magnification micrograph from perspective direction. (A) is a principal part top view of a non-expandable area | region, (b) is DD sectional drawing of (a), (c) is sectional drawing in a mounting state, (d) is sectional drawing in a natural length state. It is the trace figure of the photograph of the non-stretching area | region of a sample. It is a principal part enlarged plan view of a non-expandable region. It is a top view which shows the various arrangement | sequence examples of a sheet | seat junction part. It is a top view (outer surface side) of the underpants type disposable diaper of a deployment state. (A) is CC sectional drawing of FIG. 15, (b) is EE sectional drawing of FIG. It is sectional drawing which shows roughly the principal part cross section of the exterior body extended to some extent. It is sectional drawing which shows roughly the principal part cross section of the exterior body extended to some extent. (A) Trace figure of the plane photograph of the sheet | seat junction part formed with the 1st welding form, (b) Trace figure of the plane photograph of the sheet | seat junction part formed with the 3rd welding form. It is the schematic of an ultrasonic sealing apparatus. It is a top view which shows the change of the elastic film at the time of manufacture. It is an enlarged plan view for demonstrating the change of the expansion | extension direction of an elastic film. It is a top view which shows the change of the elastic film at the time of manufacture. It is a top view which shows the attachment process of an interior body, and a side seal and isolation | separation process. It is a top view which shows the attachment process of an interior body, and a side seal and isolation | separation process. It is a top view (inner surface side) of the tape-type disposable diaper of an unfolded state.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings. In addition, the dotted pattern part in sectional drawing has shown joining means, such as a hot-melt-adhesive.
1 to 6 show a pants-type disposable diaper. This pants-type disposable diaper (hereinafter also simply referred to as a diaper) has an exterior body 20 that forms a front body F and a back body B, and an interior body 10 that is fixed to and integrated with the exterior body 20. The interior body 10 is formed by interposing an absorber 13 between a liquid-permeable top sheet 11 and a liquid-impermeable sheet 12. In manufacturing, after the back surface of the interior body 10 is joined to the inner surface (upper surface) of the exterior body 20 by a joining means such as a hot melt adhesive, the interior body 10 and the exterior body 20 are the front body F and the back body B. Is folded at the center of the front-rear direction LD (longitudinal direction) that is the boundary of the two sides, and both side portions thereof are joined to each other by heat welding or hot melt adhesive to form the side seal portion 21, thereby forming the waist opening and the left and right sides. The pants-type disposable diaper is formed with a pair of leg openings.

(Structural example of interior body)
As shown in FIGS. 4 to 6, the inner body 10 has a structure in which an absorber 13 is interposed between a top sheet 11 and a liquid-impermeable sheet 12 made of polyethylene or the like. The excretory fluid that has passed through the sheet 11 is absorbed and retained. Although the planar shape of the interior body 10 is not particularly limited, it is generally a rectangular shape as shown in FIG.

  As the top sheet 11 covering the front side (skin side) of the absorbent body 13, a porous or non-porous nonwoven fabric or a porous plastic sheet is preferably used. The material fibers that make up the nonwoven fabric can be synthetic fibers such as polyethylene or polypropylene, synthetic fibers such as polyester or polyamide, recycled fibers such as rayon or cupra, natural fibers such as cotton, and the spunlace method. A nonwoven fabric obtained by an appropriate processing method such as a spun bond method, a thermal bond method, a melt blown method, or a needle punch method can be used. Among these processing methods, the spunlace method is excellent in terms of flexibility and drapeability, and the thermal bond method is excellent in terms of being bulky and soft. When a large number of through holes are formed in the top sheet 11, urine and the like are quickly absorbed, and the dry touch properties are excellent. The top sheet 11 entrains the side edge of the absorber 13 and extends to the back side of the absorber 13.

  As the liquid-impermeable sheet 12 covering the back side (non-skin contact side) of the absorbent body 13, a liquid-impermeable plastic sheet such as polyethylene or polypropylene is used, but in recent years, it has moisture permeability from the viewpoint of preventing stuffiness. Are preferably used. This water-impervious and moisture-permeable sheet is a microporous sheet obtained by, for example, melt-kneading an inorganic filler in an olefin resin such as polyethylene or polypropylene to form a sheet, and then stretching in a uniaxial or biaxial direction. is there.

  Absorbent body 13 is a known one, for example, a pulp fiber stack, a filament aggregate such as cellulose acetate, or a non-woven fabric, mixed with a superabsorbent polymer as necessary, fixed, etc. Can be used. The absorbent body 13 can be packaged with a wrapping sheet 14 having liquid permeability and liquid retention, such as crepe paper, if necessary, for holding the shape and polymer.

  The shape of the absorber 13 is formed in a substantially hourglass shape having a narrowed portion 13N narrower than the front and rear sides at the crotch portion. Although the size of the constricted portion 13N can be determined as appropriate, the length in the front-rear direction of the constricted portion 13N can be about 20 to 50% of the total length of the diaper, and the width of the narrowest portion is 40% of the total width of the absorber 13. It can be about -60%. In the case of having such a constricted portion 13N, if the planar shape of the interior body 10 is substantially rectangular, the interior body 10 has no absorber 13 in a portion corresponding to the constricted portion 13N of the absorber 13. Absorber side portions 17 are formed.

  The liquid-impermeable sheet 12 is folded back together with the top sheet 11 on both sides in the width direction of the absorber 13. As this liquid-impermeable sheet 12, it is desirable to use an opaque sheet so that brown color such as defecation and urine does not appear. As the opacification, a plastic film and a pigment and filler such as calcium carbonate, titanium oxide, zinc oxide, white carbon, clay, talc and barium sulfate are preferably used.

  Solid gathers 90 that fit around the legs are formed on both sides of the interior body 10. As shown in FIGS. 5 and 6, the three-dimensional gather 90 includes a fixing portion 91 fixed to the side portion of the back surface of the interior body 10, and the interior body 10 through the side of the interior body 10 from the fixing portion 91. The body part 92 extending to the side part of the surface of the body, and the front and rear end parts of the body part 92 are fixed to the side part of the surface of the interior body 10 (the top sheet 11 in the illustrated embodiment) in the lying state. It has the part 93 and the free part 94 formed between this fall part 93 unfixed. Each of these parts is formed of a gather sheet 95 which is a double sheet obtained by folding a sheet such as a nonwoven fabric. The gather sheet 95 is attached over the entire front-rear direction of the interior body 10, the lying portion 93 is provided on the front side and the rear side of the non-absorbent body side portion 17, and the free portion 94 is disposed on both front and rear sides of the non-absorbent side portion 17. Has been extended. Further, an elongated gather elastic member 96 is disposed between the double gather sheets 95 at the tip of the free part. As shown in FIG. 5, the gather elastic member 96 is for raising the free portion 94 by elastic contraction force as shown in FIG.

  The three-dimensional gather 90 shown in FIGS. 5 and 6 has a configuration in which the main body portion 92 is not folded back, but the base side portion of the main body portion 92 rises obliquely toward the center in the width direction, and from the middle portion. Any known form such as a form in which the tip side portion stands obliquely outward in the width direction can be adopted.

  As the gather elastic member 96, materials such as styrene rubber, olefin rubber, urethane rubber, ester rubber, polyurethane, polyethylene, polystyrene, styrene butadiene, silicone, and polyester that are usually used can be used. In order to make it difficult to see from the outside, it is preferable that the thickness is 925 dtex or less, the tension is 150 to 350%, and the interval is 7.0 mm or less. As the gather elastic member 96, a tape-like member having a certain width can be used in addition to the thread-like shape shown in the figure.

  In the same manner as the top sheet 11, the material fiber constituting the gather sheet 95 is made of synthetic fibers such as polyethylene or polypropylene, synthetic fibers such as polyester or polyamide, recycled fibers such as rayon or cupra, natural fibers such as cotton. Nonwoven fabric obtained by an appropriate processing method such as a spun bond method, a thermal bond method, a melt blown method, a needle punch method, etc. can be used. It is better to use a nonwoven fabric that suppresses and has excellent air permeability. Furthermore, for gather sheets 95, silicone, paraffin metal, alkylchromic chloride water repellents, etc. are used to prevent the passage of urine and the like, as well as to prevent fogging and to improve the feel to the skin (dry feeling). It is desirable to use a water-repellent non-woven fabric coated with.

  As shown in FIGS. 3 to 6, the back surface of the interior body 10 is joined to the inner surface of the exterior body 20 by a hot melt adhesive or the like in the inner / outer fixing region 10 </ b> B (shaded region). The inside / outside fixing region 10B can be determined as appropriate and can be substantially the entire width direction WD of the interior body 10, but it is preferable that both side portions in the width direction are not fixed to the exterior body 20.

(External body structure example)
The exterior body 20 extends from the side edge of the absorber 13 to the side. The exterior body 20 may have the side edge of the exterior body 20 located at the center in the width direction from the side edge of the interior body 10 at the crotch portion or at the outer side in the width direction as illustrated. Further, the exterior body 20 is a front-rear direction range between a waistline T corresponding to the side seal portion 21 and a front-rear range, a waistline T of the front body F, and a waistline T of the back body B. And an intermediate portion L. And in the exterior body 20 of the illustrated form, as shown in FIG. 2 and FIGS. 4 to 6 except for the middle in the front-rear direction of the intermediate portion L, between the first sheet layer 20A and the second sheet layer 20B. While the elastic film 30 is laminated, as shown in FIG. 7, the first sheet layer 20 </ b> A and the second sheet layer 20 </ b> B penetrate the elastic film 30 with a large number of sheet joint portions 40 arranged at intervals. It has an elastic film stretchable structure 20 </ b> X joined through the through hole 31. The first sheet layer 20 </ b> A and the second sheet layer 20 </ b> B may be indirectly joined through the elastic film 30 instead of through the through hole 31 of the elastic film 30. The planar shape of the exterior body 20 is formed by concave leg-around lines 29 so that both side edges of the intermediate portion L in the width direction form leg openings, respectively, and has a shape similar to an hourglass as a whole. The exterior body 20 may be formed separately for the front body F and the back body B, and may be disposed so as to be separated in the front-rear direction LD at the crotch portion.

  The form shown in FIGS. 1 and 2 is a form in which the elastic film stretchable structure 20X extends to the waist end region 23, but when the elastic film stretchable structure 20X is used for the waist end region 23, the waist end portion is used. If necessary, as shown in FIGS. 15 and 16, the waist end region 23 is not provided with the elastic film stretchable structure 20X as shown in FIGS. An elastic structure by the member 24 can also be provided. However, an elongated elastic member extending along the leg opening is not provided at the edge portion of the leg opening in the exterior body 20. The waist elastic member 24 is an elongated elastic member such as a plurality of thread rubbers arranged at intervals in the front-rear direction LD, and gives an elastic force so as to tighten around the body torso. The waist elastic members 24 are not arranged substantially as a single bundle with a close interval, but with a spacing of about 3 to 8 mm so as to form a predetermined stretch zone, preferably three or more, preferably Five or more are arranged. The stretch rate at the time of fixing the waist elastic member 24 can be determined as appropriate, but can be about 230 to 320% in the case of a normal adult. As the waist elastic member 24, thread rubber is used in the illustrated example, but other elongated elastic members such as flat rubber may be used. Moreover, although not shown in figure, it is good also as a general purpose form which provides only elongate elastic members, such as a thread rubber and a flat rubber, without providing the elastic body expansion-contraction structure 20X in the exterior body 20. FIG.

  As other forms, although not shown in the figure, the middle part L between the waist part T of the front body F and the waist part T of the back body B is not provided with an elastic film stretchable structure 20X. A stretchable structure 20X is continuously provided in the front-rear direction LD from the waistline T of the F to the waistline T of the back body B through the intermediate part L, or only one of the front body F and the back body B Appropriate modifications such as providing the elastic film stretchable structure 20X are also possible.

  Although the shape in the natural length state of each sheet | seat junction part 40 and the through-hole 31 can be determined suitably, a perfect circle (refer FIG. 7, FIG. 8), an ellipse, a triangle, a rectangle (refer FIG. 9-12). ), Rhombus (see FIG. 13B), etc., or convex lens shape (see FIG. 13A), concave lens shape (see FIG. 13C), star shape, cloud shape, etc. be able to. The dimensions of the individual sheet joints are not particularly limited, but the maximum length is preferably 0.5 to 3.0 mm, particularly preferably 0.7 to 1.1 mm, and the maximum width 40x is 0.1 to 3.0 mm. In particular, when the shape is long in the orthogonal direction XD orthogonal to the expansion and contraction direction, the thickness is preferably 0.1 to 1.1 mm.

The size of each sheet bonding portion 40 may be determined as appropriate. However, if the size is too large, the hardness of the sheet bonding portion 40 has an effect on the touch. If the size is too small, the bonding area is small and the materials are sufficiently bonded to each other. Since it becomes impossible, it is preferable that the area of each sheet | seat junction part 40 shall be about 0.14-3.5 mm < ² > normally. The area of the opening of each through hole 31 may be equal to or greater than the sheet joint portion because the sheet joint portion is formed through the through hole 31, but is about 1 to 1.5 times the area of the sheet joint portion. It is preferable. In addition, the area of the opening of the through-hole 31 means a value in a state of being integrated with the first sheet layer 20A and the second sheet layer 20B, not in the state of the elastic film 30 alone, and in a natural length state. When the area of the opening 31 is not uniform in the thickness direction, such as when the elastic film 30 is different from the front and back, it means the minimum value.

  Although the planar arrangement of the sheet joint portion 40 and the through holes 31 can be determined as appropriate, a planar arrangement that is regularly repeated is preferable, and an oblique lattice shape as shown in FIG. Hexagonal lattice shape as shown (these are also called staggered shapes), square lattice shape as shown in FIG. 14 (c), rectangular lattice shape as shown in FIG. 14 (d), as shown in FIG. 14 (e) Parallel body lattice (as shown in the figure, two groups are provided so that a large number of groups of parallel diagonal rows intersect each other), etc. (these are inclined at an angle of less than 90 degrees with respect to the expansion / contraction direction ED A group of sheet joints 40 (a group unit arrangement may be regular or irregular, and may be a pattern or a letter shape). It can also be.

  When the first sheet layer 20 </ b> A and the second sheet layer 20 </ b> B in the sheet bonding portion 40 are bonded through the through holes 31 formed in the elastic film 30, at least the first sheet layer 20 </ b> A and the second sheet layer 20 in the sheet bonding portion 40. It is desirable that the first sheet layer 20A and the second sheet layer 20B are not joined to the elastic film 30 except between the sheet layers 20B.

  The joining means of the first sheet layer 20A and the second sheet layer 20B in the sheet joining portion 40 is not particularly limited. For example, the bonding of the first sheet layer 20A and the second sheet layer 20B in the sheet bonding portion 40 may be performed by a hot melt adhesive, or may be performed by a bonding means such as heat sealing or ultrasonic sealing. .

  When the first sheet layer 20 </ b> A and the second sheet layer 20 </ b> B are bonded through the through-hole 31 of the elastic film 30 in the sheet bonding portion 40, the form in which the sheet bonding portion 40 is formed by material welding is the first in the sheet bonding portion 40. A first welding mode in which the first sheet layer 20A and the second sheet layer 20B are joined only by most or part of the molten solidified material 20m of at least one of the first sheet layer 20A and the second sheet layer 20B (FIG. 17A )), A second welding mode in which the first sheet layer 20A and the second sheet layer 20B are joined by all or most of the elastic film 30 in the sheet joining portion 40 or only a part of the melt-solidified material 30m (FIG. 17 ( b)) and a third welding mode in which both of these are combined (see FIG. 17C) may be used, but the second and third welding modes are preferred. Arbitrariness. Particularly preferably, the first sheet layer is composed of a part of the melt-solidified material 20m of the first sheet layer 20A and the second sheet layer 20B and the whole or most of the melt-solidified material 30m of the elastic film 30 in the sheet joint portion 40. 20A and the second sheet layer 20B are joined together. In the third welding mode shown in FIG. 19B, the elastic film 30 appears in white between the melt-solidified products 20m of the fibers of the first sheet layer 20A or the second sheet layer 20B shown in black. In the first welding form shown in FIG. 19A, an elastic film is formed between the melt-solidified products 20m of the fibers of the first sheet layer 20A or the second sheet layer 20B. A melt-solidified product is not observed (the white part is the boundary between the fiber melt-solidified product 20 m and the diffuse reflection of the fiber melt-solidified product 20 m).

  As in the first adhesive form and the third adhesive form, the first sheet layer 20A and the second sheet 20A and the second sheet 20A and the second sheet layer 20B are used by using at least one of the first sheet layer 20A and the second sheet layer 20B as the adhesive. When joining the sheet layer 20B, it is preferable not to melt part of the first sheet layer 20A and the second sheet layer 20B because the sheet joining part 40 does not harden. Note that when the first sheet layer 20A and the second sheet layer 20B are non-woven fabrics, a part of the first sheet layer 20A and the second sheet layer 20B does not melt. The composite fiber contains not only the core but also the central part of the single component fiber), but the surrounding part (including not only the sheath but also the surface part of the single component fiber of the composite fiber) melts, The fibers do not melt at all, but the remaining fibers either completely melt or the core remains but the surrounding portion includes a molten form.

  When the first sheet layer 20A and the second sheet layer 20B are joined using the melt-solidified material 30m of the elastic film 30 as an adhesive as in the second welding form and the third welding form, the peel strength becomes high. In the second welding mode, the first sheet layer 20A and the second sheet layer 20B have a melting point that is higher than the melting point of the elastic film 30 and the heating temperature when forming the sheet joint 40. In addition, the elastic film 30 is sandwiched between the second sheet layers 20 </ b> B, the portion to be the sheet bonding portion 40 is pressurized and heated, and only the elastic film 30 is melted. On the other hand, in the third welding mode, the first sheet layer 20A and the second sheet layer 20B are between the first sheet layer 20A and the second sheet layer 20B under the condition that the melting point of at least one of the first sheet layer 20A and the second sheet layer 20B is higher than the melting point of the elastic film 30. It can be manufactured by sandwiching the elastic film 30, pressurizing and heating a portion to be the sheet bonding portion 40, and melting at least one of the first sheet layer 20 </ b> A and the second sheet layer 20 </ b> B and the elastic film 30. From such a viewpoint, the melting point of the elastic film 30 is preferably about 80 to 145 ° C., and the melting points of the first sheet layer 20A and the second sheet layer 20B are about 85 to 190 ° C., particularly about 150 to 190 ° C. The difference between the melting points of the first sheet layer 20A and the second sheet layer 20B and the melting point of the elastic film 30 is preferably about 60 to 90 ° C. Moreover, it is preferable that heating temperature shall be about 100-150 degreeC.

  In the second welding mode and the third welding mode, when the first sheet layer 20A and the second sheet layer 20B are non-woven fabrics, the melt-solidified product 30m of the elastic film 30 is a sheet joint portion as shown in FIG. 40 may penetrate between the fibers in the entire thickness direction of the first sheet layer 20A and the second sheet layer 20B, but as shown in FIGS. 17 (b) (c) and 18 (a), it is intermediate in the thickness direction. The form that penetrates between the fibers up to or the form that hardly penetrates between the fibers of the first sheet layer 20A and the second sheet layer 20B as shown in FIG. It will be a thing.

  FIG. 20 shows an example of an ultrasonic sealing device suitable for forming the second welding form and the third welding form. In this ultrasonic sealing apparatus, when the sheet bonding portion 40 is formed, the first sheet layer 20A, between the anvil roll 60 and the ultrasonic horn 61, each having a projection 60a formed in the pattern of the sheet bonding portion 40 on the outer surface, The elastic film 30 and the second sheet layer 20B are fed. At this time, for example, the feeding driving speed of the upstream elastic film 30 by the feeding driving roll 63 and the nip roll 62 is made slower than the feeding speed after the anvil roll 60 and the ultrasonic horn 61, thereby the feeding driving roll 63 and the nip roll 62. The elastic film 30 is stretched in the MD direction (machine direction, flow direction) through the path from the nip position by the anvil roll 60 and the sealing position by the ultrasonic horn 61 to stretch to a predetermined stretch rate as a whole. The stretch rate of the elastic film 30 as a whole can be set by selecting a speed difference between the anvil roll 60 and the feed drive roll 63, and can be set to about 300% to 500%, for example. 62 is a nip roll. The first sheet layer 20 </ b> A, the elastic film 30, and the second sheet layer 20 </ b> B fed between the anvil roll 60 and the ultrasonic horn 61 are stacked in this order, and the protrusion 60 a and the ultrasonic horn 61 are While being pressurized, the ultrasonic horn 61 is heated by ultrasonic vibration energy to melt only the elastic film 30 or at least one of the first sheet layer 20A and the second sheet layer 20B and the elastic film 30 are melted. By doing so, the first sheet layer 20 </ b> A and the second sheet layer 20 </ b> B are joined through the through-hole 31 at the same time as the through-hole 31 is formed in the elastic film 30. Therefore, in this case, by selecting the size, shape, separation interval, arrangement pattern in the roll length direction and roll circumferential direction, etc., of the projections 60a of the anvil roll 60, the area ratio of the sheet joining portion 40 is selected. Can do.

  The reason why the through hole 31 is formed is not necessarily clear, but it is considered that the hole corresponding to the protrusion 60a of the anvil roll 60 in the elastic film 30 is melted and separated from the surroundings. At this time, the portion of the elastic film 30 between the through holes 31 adjacent to the expansion / contraction direction ED is expanded / contracted by the through holes 31 as shown in FIGS. 7 (a), 9 (a) and 11 (a). Since it is cut from both sides of the direction and loses the support on both sides of the contraction direction, the expansion direction is closer to the center of the orthogonal direction XD orthogonal to the expansion / contraction direction ED within a range in which continuity in the direction orthogonal to the contraction direction can be maintained. The through hole 31 expands in the expansion / contraction direction ED. And when the sheet | seat junction part 40 is formed in the pattern in which the part which the elastic film 30 continues linearly along the expansion / contraction direction ED remains like the expansion / contraction area | region 80 mentioned later, in FIG.7 (d) and FIG.9 (d). As shown, when contracted to a natural length state by cutting into individual products or the like, the length in the expansion / contraction direction ED of the enlarged portion of the through hole 31 is a gap between the through hole 31 and the sheet joining portion 40. It will shrink until it is no longer possible. On the other hand, when the sheet bonding portion 40 is formed in a pattern in which the elastic film 30 does not have a linearly continuous portion along the expansion / contraction direction ED as in a non-expandable region 70 described later, as shown in FIG. When the product is contracted to the natural length state by being cut into a product, it is hardly contracted, so that a large gap is left between the through hole 31 and the sheet joining portion 40.

The constituent material of the first sheet layer 20A and the second sheet layer 20B can be used without particular limitation as long as it is a sheet, but it is preferable to use a nonwoven fabric from the viewpoint of air permeability and flexibility. The nonwoven fabric is not particularly limited as to what the raw fiber is. For example, synthetic fibers such as olefins such as polyethylene and polypropylene, polyesters and polyamides, recycled fibers such as rayon and cupra, natural fibers such as cotton, and mixed fibers and composite fibers using two or more of them. Etc. can be illustrated. Furthermore, the nonwoven fabric may be manufactured by any processing. Examples of the processing method include known methods such as a spunlace method, a spunbond method, a thermal bond method, a melt blown method, a needle punch method, an air through method, and a point bond method. When using a nonwoven fabric, the basis weight is preferably about 12 to ²⁰ g / m ² . Moreover, a part or all of the first sheet layer 20A and the second sheet layer 20B may be a pair of layers in which one material is folded and faced. For example, as shown in the figure, in the waist end region 23, the constituent material located outside is the second sheet layer 20B, and the folded portion 20C that is folded back to the inner surface side at the waist opening edge is the first sheet layer 20A. In addition, the elastic film 30 is interposed therebetween, and in the other portions, the constituent material positioned inside is the first sheet layer 20A, and the constituent material positioned outside is the second sheet layer 20B, and the elastic film 30 is interposed therebetween. Can be interposed. Of course, the constituent material of the first sheet layer 20A and the constituent material of the second sheet layer 20B are individually provided over the entire front-rear direction LD, and the constituent material of the first sheet layer 20A and the second sheet are not folded back. The elastic film 30 can also be interposed between the constituent materials of the layer 20B.

  The elastic film 30 is not particularly limited, and as long as it is a thermoplastic resin film having elasticity per se, a film having a large number of holes and slits for ventilation can also be used. . In particular, the tensile strength in the MD direction is 8 to 25 N / 35 mm, the tensile strength in the CD direction is 5 to 20 N / 35 mm, the tensile elongation in the MD direction is 450 to 1050%, and the tensile elongation in the CD direction is 450 to 1400%. The elastic film 30 is preferable. Although the thickness of the elastic film 30 is not specifically limited, It is preferable that it is about 20-40 micrometers.

(Elastic area)
The area | region which has the elastic film expansion-contraction structure 20X in the exterior body 20 has an expansion-contraction expansion-contraction area | region. In the stretchable region 80, the elastic film 30 has a portion 32 linearly continuous along the stretchable direction ED, and is contracted in the stretchable direction ED by the contraction force of the elastic film 30, and in the stretchable direction ED. It can be extended. More specifically, in a state where the elastic film 30 is extended in the expansion / contraction direction ED, the elastic film 30 is spaced from each other in the expansion / contraction direction ED and the orthogonal direction XD (for example, the width direction WD and the front / rear direction LD). The first sheet layer 20 </ b> A and the second sheet layer 20 </ b> B are joined via 31 to form a large number of sheet joining portions 40, thereby forming the elastic film stretchable structure 20 </ b> X. Such stretchability can be imparted by arranging the through holes 31 so as to have linearly continuous portions along the stretch direction ED.

  In the natural length state, the stretchable region 80 swells in the direction in which the first sheet layer 20A and the second sheet layer 20B between the sheet joining portions 40 are separated from each other, as shown in FIGS. 7 (d) and 9 (d). Thus, the contraction ridge 25 extending in the orthogonal direction XD is formed, and as shown in FIGS. 7C and 9C, the contraction ridge 25 is stretched but remains even in the mounted state extended to some extent in the expansion / contraction direction ED. It is like that. Further, as illustrated, the first sheet layer 20A and the second sheet layer 20B are not joined to the elastic film 30 except at least between the first sheet layer 20A and the second sheet layer 20B in the sheet joining portion 40. FIGS. 7 (c) and 9 (c) assuming the mounted state, and FIGS. 7 (a) (b) and 9 (a) (9) assuming the expanded state of the first sheet layer 20A and the second sheet layer 20B. As can be seen from b), in these states, a gap is formed between the through hole 31 in the elastic film 30 and the sheet joint portion 40, and the material of the elastic film 30 is a non-porous film or sheet. However, air permeability is added by this gap. Further, in the natural length state shown in FIG. 7D and FIG. 9D, the through hole 31 is squeezed due to the contraction of the elastic film 30, and almost no gap is formed between the through hole 31 and the sheet joining portion 40. Not. In addition, the state of the shrinkage wrinkle 25 in the mounted state and the natural length state also appears in FIGS.

  The elastic limit elongation in the expansion / contraction direction ED of the expansion / contraction region 80 is desirably 200% or more (preferably 265 to 295%). The elastic limit elongation of the stretchable region 80 is substantially determined by the stretch rate of the elastic film 30 at the time of manufacture, but based on this, it is lowered by a factor that inhibits the shrinkage in the stretchable direction ED. The main factor of such inhibition is the ratio of the length 40x of the sheet joint portion 40 per unit length in the expansion / contraction direction ED, and the elastic limit elongation decreases as the ratio increases. In a normal case, the length 40x of the sheet bonding portion 40 has a correlation with the area ratio of the sheet bonding portion 40, so that the elastic limit elongation of the stretchable region 80 can be adjusted by the area ratio of the sheet bonding portion 40.

  The extension stress of the stretchable region 80 can be adjusted mainly by the sum of the widths 32w of the portions 32 where the elastic film 30 continues linearly along the stretch direction ED (for example, the width direction WD). The width 32w of the portion 32 in which the elastic film 30 is linearly continuous along the expansion / contraction direction ED is equal to the interval 31d in the orthogonal direction XD (for example, the front-rear direction LD) of the through-holes 31 in contact with both side edges of the continuous portion 32. The interval 31d between the through holes 31 is equal when the length 31y of the through hole 31 in the orthogonal direction XD is equal to the length 40y of the sheet bonding portion 40 in the orthogonal direction XD (the aforementioned through hole 31 and the sheet bonding portion). For example, when the 40 simultaneous forming method is employed, the sheet joining portion 40 in contact with both side edges of the continuous portion is equal to the interval 40d in the orthogonal direction XD. Therefore, in this case, the extension stress of the stretchable region 80 can be adjusted by the ratio of the length 40y of the sheet joint portion 40 per unit length in the orthogonal direction XD. Since the length 40y of the sheet has a correlation with the area ratio of the sheet bonding portion 40, the length of the sheet bonding portion 40 can be adjusted by the area ratio of the sheet bonding portion 40. The elongation stress of the expansion / contraction region 80 can be determined based on the elongation stress when it is expanded to 50% of the elastic limit.

The area ratio of the sheet bonding portion 40 and the area of each sheet bonding portion 40 in the stretchable region 80 can be determined as appropriate, but in the normal case, it is preferably within the following range.
Area of sheet joint 40: 0.14 to 3.5 mm ² (particularly 0.14 to 1.0 mm ² )
Area ratio of sheet joint portion 40: 1.8 to 19.1% (particularly 1.8 to 10.6%)

  As described above, since the elastic limit elongation and the extension stress of the stretchable region 80 can be adjusted by the area of the sheet joint portion 40, a plurality of regions having different area ratios of the sheet joint portion 40 in the stretchable region 80 as shown in FIG. The fitting property can be changed according to the part. In the form shown in FIG. 15, the area 81 extending in the oblique direction along the base of the leg in the front body F and the edge area 82 of the leg opening have a higher area ratio of the sheet joint portion 40 than the other areas. Therefore, the extensional stress is weak and the region expands and contracts flexibly. In addition, the iliac facing region 83 and the edge region 82 of the leg opening in the back body B also have a higher area ratio of the sheet joint portion 40 than the other regions, and therefore the extension stress is weak and the region expands and contracts flexibly. It has become. Furthermore, in the illustrated example, the area 84 in the width direction WD intermediate portion of the front body F that overlaps the interior body 10 has a higher area ratio of the sheet bonding portion 40 than the other areas, and the elongation stress is even weaker. The elastic limit elongation is also a smaller region.

(Stretch direction)
In the example of illustration, each expansion-contraction area | region 80 of the front body F and the back body B has the single film part 85 which contains only the elastic film 30 and does not contain another elastic member. In the illustrated example, the single film portion 85 extends over the entire stretchable region 80, but only a part of the stretchable region 80 may have a single-layer elastic film 30. Each single film portion 85 extends from the middle portion L to the waist portion T, is located on the waist opening side, and the first region 51 in which the expansion / contraction direction ED is the first direction D1 (width direction WD). And second regions 52 and 53 that are located in a direction perpendicular to the first direction D1 with respect to the first region 51 and extend and contract in an oblique direction (second directions D2 and D3) with respect to the first direction D1. doing.

  Further, each single film portion 85 in the example shown in FIG. 2 is adjacent to the first region 51 as the second region, and the region 53 in which the expansion / contraction direction ED is obliquely upward D3 toward the center in the width direction, and the front and rear thereof. And a region 52 including a portion along the base of the leg in which the expansion / contraction direction ED is obliquely downward D2 toward the center in the width direction, and between these second regions 52 and 53. Is interspersed with a weakly stretchable region 54 having a very weak stretch force. On the other hand, in the example shown in FIG. 15, the second region is only a region 52 including a portion along the base of the leg, with the expansion / contraction direction ED obliquely downward D2 toward the center in the width direction. In any case, in these examples, due to the single film portion 85, a contraction force appears diagonally downward D2 toward the center in the width direction in the portion along the base of the wearer's leg, and the width is closer to the waist opening side than that. Since it has a portion where contraction force is expressed in the direction WD, the fitting property to each of the base of the leg and the circumference of the trunk becomes good. The difference between the example shown in FIG. 2 and the example shown in FIG. 15 is based on the difference in the manufacturing method described later.

  The position of the first region 51 is not particularly limited, but preferably includes at least the end on the waist opening side in the single film portion 85 of the waistline portion T in the front-rear direction LD. It is more preferable that the entire waist opening side is included from the center in the front-rear direction of T. Moreover, although the 1st area | region 51 may be provided only in a part of width direction WD, it is preferable if it extends over the whole width direction of the trunk periphery part T. FIG.

  The positions of the second regions 52 and 53 can be appropriately determined as long as they include a portion along the base of the wearer's leg, but in the front-and-rear direction LD, the leg opening side of the waistline portion T in the single film portion 85. It is preferable that it is provided in the part from the edge part to the intermediate part L. Further, in the width direction WD, it is preferably provided at least on both sides in the width direction rather than on both side edges of the interior body 10, and may be provided over the entire width direction, but a portion overlapping the interior body 10 will be described later. A non-stretchable region 70 can also be provided.

  The elastic film elastic structure 20X of the example shown in FIG. 15 can be manufactured by the method shown in FIGS. 20 and 21, for example. That is, in the manufacturing process of the exterior body 20, as in the example shown in FIG. 20, the elastic film 30 is continuously supplied in the MD direction, and the first sheet layer 20 </ b> A and the second sheet layer 20 </ b> B are respectively provided on the front and back sides. The elastic film 30 is continuously supplied in the MD direction, and the elastic film 30 is stretched in the MD direction and is sandwiched between the first sheet layer 20A and the second sheet layer 20B, and the elastic film 30 is formed at a plurality of spaced positions. By joining the first sheet layer 20 </ b> A and the second sheet layer 20 </ b> B through or through the elastic film 30, the part that becomes the exterior body 20 of the front body F and the part that becomes the exterior body 20 of the back body B are integrated. Form.

  Characteristically, in the manufacturing process of the exterior body 20, as the elastic film 30, at least a single elasticity extending from within a portion that becomes the waist circumference portion T of the front body F to within a portion that becomes the waist circumference portion T of the back body B. A film 30 is supplied. Prior to joining the first sheet layer 20A and the second sheet layer 20B, as shown in FIG. 21, the crotch part of each pant-type disposable diaper in the middle region in the CD direction of the elastic film 30 A slit 35 having a CD direction dimension of 50 mm or more is sequentially formed in a portion including the portion to be formed, and a continuous portion 36 continuous in the MD direction is left on both sides of the CD direction with respect to the slit 35. And the 1st sheet layer 20A and the 2nd sheet layer 20B are joined in the state where the elastic film 30 which has this slit 35 and continuous part 36 was extended in the MD direction.

  Prior to joining the first sheet layer 20A and the second sheet layer 20B, if a slit 35 having a length in the CD direction of 50 mm or more is formed in the middle of the CD direction in the elastic film 30, the slit 35 is formed. When the elastic film 30 is stretched in the MD direction, the slit 35 is contracted in the CD direction while expanding in the MD direction, as indicated by white arrows in FIG. Accordingly, the portion of the continuous portion 36 adjacent to the end portion of the slit 35 in the CD direction is pulled toward the center side of the slit 35 in the CD direction, and the continuous portion 36 is not affected by the tensile force in the MD direction ( A portion that extends in the first direction D1) and a portion in which the extension direction changes in an oblique direction (second direction D2) toward the end of the slit 35 in the CD direction due to the influence of the tension are formed. Therefore, in this state, after joining the first sheet layer 20A and the second sheet layer 20B, when the extension force is released, the part extending in the oblique direction at the time of joining includes the part along the base of the leg, and the width direction The second regions 52 and 53 expand and contract in a diagonally downward direction toward the center of the WD, and on the waist opening side, the portion extending in the MD direction at the time of joining is the MD direction (that is, the width direction WD in the example shown in FIG. 15). ) Becomes the first region 51 that expands and contracts.

  In addition, the process of a well-known manufacturing method is employable. For example, as shown in FIG. 24, after the portion 200 that becomes the exterior body 20 formed integrally by the manufacturing process of the exterior body 20 is cut out from the portion that becomes the leg opening LO, or as shown in FIG. After dividing into the part 201 to be the outer body 20 of the F and the part 202 to be the outer body 20 of the back body B, the width direction WD of the disposable wearing article is the MD direction in the same arrangement as the deployed state of the disposable wearing article. By assembling the interior body 10 that is separately manufactured in the manufacturing process of the interior body 10 while being transported so as to be spaced apart in the MD direction, the parts that become individual disposable wearing articles are continuous in the MD direction in the unfolded state. An interior assembly is formed (attachment process of interior body 10). Thereafter, the interior assembly is folded in two in the CD direction, and then a portion 201 that becomes the exterior body 20 of the front body F and a portion 202 that becomes the exterior body 20 of the back body B at the portions that are both sides of each disposable wearing article. Joining and forming the side seal part 21, cut | disconnect the part used as the exterior body 20 of the front body F, and the part used as the exterior body 20 of the back body B in the boundary of each disposable wearing article (side seal and isolation | separation process) ), Individual pants-type disposable diapers can be manufactured.

  On the other hand, the elastic film elastic structure 20X of the example shown in FIG. 2 can be manufactured by the method shown in FIGS. 20 and 23, for example. That is, in the manufacturing process of the exterior body 20, prior to joining the first sheet layer 20A and the second sheet layer 20B, as shown in FIG. A slit 35 having a dimension in the CD direction of 50 mm or more is formed in the first part P1 which becomes both side edges of F and the both sides of the back body B, and the second part P2 including the part which becomes the crotch part of each pant-type disposable diaper. Form each one. At this time, a second continuous portion 36A that continues in the MD direction is left outside the first portion P1 in the CD direction, and is continuous in the MD direction between the first portion P1 and the second portion in the CD direction. The continuous portion 36B is left. And the 1st sheet layer 20A and the 2nd sheet layer 20B are joined in the state where the elastic film 30 which has this slit 35, the 1st continuous part 36A, and the 2nd continuous part 36B was extended in the MD direction.

  In this way, when the slit 35 is formed in the first part P1 and the second part P2, and the elastic film 30 leaving the first continuous part 36A and the second continuous part 36B is extended in the MD direction, as shown in FIG. The slit 35 is reduced in the CD direction while expanding in the MD direction. This is the same as the example shown in FIG. However, in the example shown in FIG. 23, the slits 35 are alternately arranged with an interval in the MD direction and the CD direction, and the first continuous portion 36A and the second continuous portion 36B remain. As a result, as the slit 35 expands in the MD direction and contracts in the CD direction, the portion of the first continuous portion 36A adjacent to the end of the slit 35 in the CD direction is the center side of the slit 35 in the CD direction. The first continuous portion 36A has a portion extending in the MD direction (first direction D1) without being affected by the tension, and an oblique direction in which the extending direction is directed toward the end of the slit 35 in the CD direction due to the influence of the tension. A portion changed in the direction (second direction D3) is formed.

  On the other hand, in the second continuous portion 36B, a portion adjacent to the end of the slit 35 located on one side across the second continuous portion 36B and a portion adjacent to the end of the slit 35 located on the other side are: They are pulled away from each other in the CD direction. As a result, in the second continuous portion 36B, the portion between the end portion of the slit 35 located on one side and the end portion of the slit 35 located on the other side across the second continuous portion 36B is the second continuous portion. It will be in the state extended in the diagonal direction (2nd direction D2) which connects the edge part of the slit 35 located in one side, and the edge part of the slit 35 located in the other side on both sides of the part 36B. That is, since the tensile force in the opposite direction due to the deformation of the two slits 35 acts on the obliquely extended portion of the second continuous portion 36B, the first continuous portion 36A where the tensile force due to the deformation of one slit 35 acts. The inclination in the extension direction becomes deeper than the extension part in the oblique direction.

  In this state, after joining the first sheet layer 20A and the second sheet layer 20B, when the extension force is released, as shown in the example shown in FIG. The front-rear LD range corresponding to the slits 35 on both sides of the body B is a weakly stretchable region 54 with very weak stretch force, and is adjacent to the top and bottom sides of this weakly stretchable region 54 and extends obliquely at the time of joining. Becomes the second regions 52 and 53 that expand and contract in the oblique direction, and the portion that extends adjacent to the waist opening side of the second regions 52 and 53 and extends in the MD direction at the time of joining becomes the first region 51 that expands and contracts in the MD direction. The second region 52 at the center in the front-rear direction LD with respect to the weakly stretchable region 54 includes a portion along the base of the leg, the stretchable direction ED is obliquely downward toward the center of the width direction WD, and the waist is lower than the weakly stretchable region 54. In the second region 53 on the opening side, the expansion / contraction direction ED is obliquely upward toward the center of the width direction WD. Note that the front-rear direction LD range corresponding to the slit 35 of the second part P2 is cut to form a leg opening in the illustrated example, and hardly remains in the product, but if it remains, it becomes a weakly stretchable region 54. In addition, the process of a well-known manufacturing method, for example, the process of the example shown in FIG. 24 or FIG. 25, is employable.

  In these manufacturing methods, the slit 35 means a cut that is a natural length and hardly opens, but instead of the slit 35, the MD direction dimension is shorter than the CD direction dimension (for example, other than half). A hole may be provided. The CD direction dimension of the slit 35 or the hole can be appropriately determined as long as it is 50 mm or more, but is usually 50 to 400 mm, particularly preferably 80 to 320 mm. Moreover, although it is preferable that the slit 35 is located in the area | region used as the intermediate part L of each underpants type disposable diaper in the elastic film 30, the area | region used as the waist part T of the front body F, and the back body B You may extend to the CD direction to at least one of the area | region used as the trunk periphery part T. FIG.

(Non-stretchable area)
In the example shown in FIG. 2, the entire elastic film 30 stretchable structure 20 </ b> X is the stretchable region 80 and does not have a non-stretchable region, but the region having the elastic film stretchable structure 20 </ b> X has a non-stretchable region as shown in FIG. 15. A stretchable region 70 can be provided. The arrangement of the stretchable region 80 and the non-stretchable region 70 can be determined as appropriate. In the case of the exterior body 20 of the pants-type disposable diaper as in the present embodiment, the portion overlapping the absorber 13 is an area that does not need to be expanded and contracted, and therefore, part or all of the portion overlapping the absorber 13 as illustrated. It is preferable to make the non-stretchable region 70 (desirably including almost the entire inner and outer fixed region 10B). Of course, the non-stretchable region 70 can be provided from the region overlapping with the absorber 13 to the region not overlapping with the absorber 13 positioned in the width direction WD or the front-rear direction LD, and the non-stretchable region only in the region not overlapping with the absorber 13. 70 can also be provided.

  Although the elastic film 30 is continuous, the non-stretchable region 70 can be a region that does not have a linearly continuous portion along the extending direction during manufacturing due to the presence of the through-hole 31. Therefore, even if the entire elastic film stretchable structure 20X including both the stretchable region 80 and the non-stretchable region 70 is formed in the same manner as the stretchable region 80, as shown in FIG. However, the shrinkage force of the elastic film 30 hardly acts on the first sheet layer 20A and the second sheet layer 20B because it does not continue linearly along the extending direction during manufacture (width direction WD in the example of FIG. 11). Elasticity almost disappears and elastic limit elongation becomes close to 100%. In such a non-stretchable region 70, the first sheet layer 20 </ b> A and the second sheet layer 20 </ b> B are joined by a large number of sheet joining portions 40 arranged at intervals, and the sheet joining portion 40 is not continuous. Therefore, a decrease in flexibility is prevented. In other words, the stretchable region 80 and the non-stretchable region 70 can be formed depending on the presence or absence of a portion where the elastic film 30 does not continue linearly along the extending direction during manufacture. In addition, the continuity of the elastic film 30 remains even in the non-stretchable region 70. As can be seen from FIG. 12, the independent cut piece of the elastic film 30 does not remain and no wrinkles are formed. And the air permeability of the thickness direction by the through-hole 31 is ensured. The non-stretchable region 70 may have an elastic limit elongation in the stretch direction ED of 120% or less, preferably 110% or less, and particularly preferably 100%.

  Although the arrangement pattern of the through holes 31 in the elastic film 30 in the non-stretchable region 70 can be determined as appropriate, it is arranged in a staggered manner as shown in FIG. When the pattern is shorter than the length 31y in the orthogonal direction XD, the linear continuity in the expansion / contraction direction ED can be almost completely eliminated while maintaining the continuity of the elastic film 30, and the appearance is preferable as shown in FIG. Become. In this case, the center interval 31f in the expansion / contraction direction ED of the through hole 31 is more preferably shorter than the length 31x of the through hole 31 in the expansion / contraction direction ED.

  In a normal case, in particular, when the elongation stress when the elastic film 30 is stretched four times in the stretching direction ED is 4 to 12 N / 35 mm, the non-stretchable region 70 is stretched to the elastic limit in the stretching direction ED. The center interval 31e in the orthogonal direction XD of the through holes 31 is 0.4 to 2.7 mm, and the length 31y in the orthogonal direction XD of the through holes 31 is 0.5 to 3.0 mm, particularly 0.7 to 1.1 mm. Is preferable. The center interval 31f in the expansion / contraction direction ED of the through hole 31 is preferably 0.5 to 2 times, particularly 1 to 1.2 times the length 31y of the through hole 31 in the orthogonal direction XD. The length 31x in the expansion / contraction direction ED is 1.1 to 1.8 times, particularly 1.1 to 1.4 times the center interval 31f of the through hole 31 in the expansion / contraction direction ED. In the state where the non-expandable region 70 is extended to the elastic limit in the expansion / contraction direction ED (in other words, the state where the first sheet layer 20A and the second sheet layer 20B are completely expanded), the center of the through hole 31 in the expansion / contraction direction ED. The interval 31 f is equal to the center interval 40 f in the expansion / contraction direction ED of the sheet bonding portion 40, the center interval 31 e in the orthogonal direction XD of the through hole 31 is equal to the center interval 40 e in the orthogonal direction XD of the sheet bonding portion 40, and is orthogonal to the through hole 31. The length 31y in the direction XD is equal to the length 40y in the orthogonal direction XD of the sheet bonding portion 40.

  In the non-stretchable region 70, the first sheet layer 20A and the second sheet layer 20B and the elastic film 30 are not joined except for the portion between the first sheet layer 20A and the second sheet layer 20B in the sheet joining portion 40, And when it has the clearance gap formed by the periphery of the through-hole 31 of the elastic film 30 and the sheet | seat junction part 40 being spaced apart in the both sides of the expansion-contraction direction ED of the sheet | seat junction part 40 in the natural length state, Even if the material is a non-porous film or sheet, air permeability is always added by this gap, which is preferable. In the case where the above-described simultaneous formation method of the through hole 31 and the sheet joint portion 40 is adopted, this state naturally occurs regardless of the shape or the like of the sheet joint portion 40.

  Although the shape in the natural length state of each sheet | seat junction part 40 and the through-hole 31 is not specifically limited, It is desirable that an area is small from a softness | flexibility viewpoint, and eliminates the linear continuity of the width direction WD of the elastic film 30. For this purpose, since it is desirable to have a shape that is long in the front-rear direction LD, an ellipse that is long in the front-rear direction LD, a rectangle (see FIGS. 11 and 13D), a rhombus (see FIG. 13B), and a convex lens shape. It is preferable to use a concave lens shape (see FIG. 13C) (see FIG. 13A). However, if the corner is an acute angle like a diamond, the elastic film 30 is easily broken. On the other hand, the convex lens shape is preferable because the welding of the sheet joining portion 40 is stable, and the concave lens shape is preferable in that the area can be further reduced.

Although the area ratio of the sheet joint portion 40 and the area of each sheet joint portion 40 in the non-stretchable region can be determined as appropriate, in the normal case, if within the following range, the area of each sheet joint portion 40 is small and the sheet It is preferable because the non-stretchable region 70 does not become hard because the area ratio of the joint portion 40 is low.
Area of sheet joint 40: 0.10 to 0.75 mm ² (particularly 0.10 to 0.35 mm ² )
Area ratio of sheet joint 40: 4 to 13% (especially 5 to 10%)

  As described above, the elastic limit elongation of the non-stretchable region 70 can be changed by the arrangement pattern of the through holes 31, the dimensions of the individual through holes 31, and the center interval. Therefore, although not shown, these can be made different at a plurality of locations in the stretchable region 80 or between the plurality of non-stretchable regions 70. For example, it is one preferable mode to make the elastic limit elongation in the non-stretchable region 70 of the front body F larger than the elastic limit elongation in the non-stretchable region 70 of the rear body B.

  Although the non-stretchable region 70 has a portion that is linearly continuous along the stretch direction ED like the stretchable region, the elastic limit elongation is remarkably low because the area ratio of the sheet joint is higher than that of the stretchable region. It is also possible to adopt a form that kills other stretchability, such as a form that is 130% or less, a form that is cut in one or more places in the stretch direction ED, such as a stretch structure using a conventional rubber thread it can.

(Other)
The stretchable structure 20X described above is not only a pants-type disposable diaper, but also other stretchable parts such as a three-dimensional gather, a flat gather, etc., which are widely used in the absorbent article, and around the trunk of a tape-type disposable diaper. It can also be applied to a manufacturing method. In this case, the first direction, the second direction, the positions of the first region and the second region, and the positions of the slits or holes can be determined as appropriate in consideration of fit properties and the like.

  For example, as shown in FIG. 26, the tape-type disposable diaper has a connecting tape 100 extending from both sides of the back body B, and the connecting tape 100 has a connecting part 101 that is detachably connected to the front body F. It is what you have. In such a tape-type disposable diaper, for example, an expansion / contraction region 80 having a single film portion 85 is provided in the middle in the width direction of the back body B, and the expansion / contraction direction ED has a width above the middle in the vertical direction in the single film portion 85. A first region 51 in the direction WD can be provided, and a second region 52 in which the expansion / contraction direction ED is obliquely upward toward both sides of the width direction WD can be provided below the first region 51.

  Further, the connecting tape 100 is provided with an expansion / contraction region 80 having a single film portion 85, and a first region 51 in which the expansion / contraction direction ED is the width direction WD is provided above the middle of the connection tape 100 in the vertical direction, and below that. The second region 52 in which the expansion / contraction direction ED is obliquely upward toward the tip end side of the connecting tape 100 may be provided. The lower side of the connecting tape 100 is a leg opening, and the leg opening can be deformed by expansion and contraction of the connecting tape 100. Thus, by providing the first region 51 and the second region 52 in the connecting tape 100 as in the latter case, the connecting tape 100 is connected. Since the tape 100 can be expanded and contracted in a direction closer to the direction around the legs, the fit around the legs is excellent. In addition, the first region 51 having stretchability in the width direction WD ensures the fit in the waistline direction. As in the illustrated example, it is also preferable that the connecting tape 100 can be vertically divided (or cut in advance) by the perforation 102 along the boundary between the first region and the second region.

<Explanation of terms in the specification>
The following terms in the specification have the following meanings unless otherwise specified in the specification.
-"Front body" and "rear body" mean the front and rear portions of the pants-type disposable diaper in the front-rear direction center, respectively. Moreover, a crotch part means the front-back direction range containing the center of the front-back direction of a pants type disposable diaper, and when an absorber has a constriction part, it means the front-back direction range of the part which has the said constriction part.
・ "MD direction" and "CD direction" mean the flow direction (MD direction) in production equipment and the transverse direction (CD direction) perpendicular to this, and either one is the front-rear direction of the product. The other is the width direction of the product. The MD direction of the nonwoven fabric is the direction of fiber orientation of the nonwoven fabric. The fiber orientation is the direction along which the fibers of the nonwoven fabric are aligned. For example, the fiber orientation can be determined from the measurement method according to the TAPPI standard method T481, the fiber orientation test method using the zero-range tensile strength, It can be discriminated by a simple measuring method for determining the orientation direction.
-“Elastic limit elongation” means the elongation of the elastic limit in the expansion / contraction direction ED (in other words, the state in which the first sheet layer and the second sheet layer are completely expanded), and the length at the elastic limit is the natural length. Is expressed as a percentage with respect to 100%.
The “area ratio” means the ratio of the target portion to the unit area, and the target portion (for example, the sheet joint portion 40, the stretchable region 80, the non-stretchable region 70, the main stretchable portion, the buffer stretchable portion) in the target region. The total area of the through holes 31 and the vent holes is divided by the area of the target region and expressed as a percentage. In particular, the “area ratio” in the region having a stretchable structure is the elastic limit in the stretchable direction ED. It means the area ratio in the stretched state. In a form in which a large number of target portions are provided at intervals, it is desirable to set the target region to a size that includes 10 or more target portions and obtain the area ratio.
“Elongation rate” means a value when the natural length is 100%.
・ "Weight" is measured as follows. After the sample or test piece has been pre-dried, it is left in a test room or apparatus in a standard state (test location is temperature 23 ± 1 ° C., relative humidity 50 ± 2%) to a constant weight. Pre-drying refers to making a sample or test piece constant in an environment at a temperature of 100 ° C. In addition, it is not necessary to perform preliminary drying about the fiber whose official moisture content is 0.0%. From the test piece in a constant weight state, a sample plate (100 mm × 100 mm) is used to cut a sample having a size of 100 mm × 100 mm. The weight of the sample is measured, multiplied by 10, and the weight per square meter is calculated and used as the basis weight.
・ "Thickness" of the absorber is a thickness measuring instrument (Peacock, dial thickness gauge large type, model JB (measurement range 0 to 35 mm) or model K-4 (measurement range 0 to 50 mm)) manufactured by Ozaki Mfg. Co., Ltd. Measure the sample and the thickness meter horizontally.
-"Thickness" other than the above is automatically measured using an automatic thickness measuring instrument (KES-G5 handy compression measurement program) under the conditions of load: 0.098 N / cm ² and pressure area: 2 cm ² .
・ "Tensile strength" and "tensile elongation (breaking elongation)" are in accordance with JIS K7127: 1999 "Plastic-Test method for tensile properties-" except that the test piece is rectangular with a width of 35 mm and a length of 80 mm. The initial chuck interval (distance between marked lines) is 50 mm, and the tensile speed is 300 mm / min.
・ "Elongation stress" means according to JIS K7127: 1999 "Plastics-Test method for tensile properties-" by a tensile test in which the initial chuck interval (distance between marked lines) is 50 mm and the tensile speed is 300 mm / min. This means the tensile stress (N / 35 mm) measured when stretching in the elastic region, and the degree of stretching can be appropriately determined depending on the test object. It is preferable that the test piece has a rectangular shape with a width of 35 mm and a length of 80 mm or more. However, when a test piece with a width of 35 mm cannot be cut out, the test piece is prepared with a width that can be cut out, and the measured value is 35 mm. The value converted to. Even if the target area is small and sufficient specimens cannot be collected, as long as the magnitude of the extension stress is compared, at least a comparison can be made even if the specimens of the same size are used even if they are appropriately small. .
-"Developed state" means a state where the plate is flattened without contraction or slack.
-Unless otherwise specified, the dimensions of each part mean dimensions in a deployed state, not a natural length state.
・ If there is no description about the environmental conditions in the test and measurement, the test and measurement shall be performed in a test room or equipment in the standard state (test location: temperature 23 ± 1 ° C, relative humidity 50 ± 2%). To do.

  INDUSTRIAL APPLICABILITY The present invention can be used for all disposable wearing articles having stretch regions such as a pants-type disposable diaper as in the above example, various disposable diapers such as a tape type and a pad type, and sanitary napkins.

  DESCRIPTION OF SYMBOLS 10 ... Interior body, 10B ... Inner / outer fixed area | region, 11 ... Top sheet, 12 ... Liquid impervious sheet, 13 ... Absorber, 13N ... Constricted part, 14 ... Packaging sheet, 17 ... Non-absorber side part, 20 ... Exterior body , 20A ... first sheet layer, 20B ... second sheet layer, 20C ... folded portion, 20X ... elastic film stretchable structure, 21 ... side seal part, 23 ... waist end region, 24 ... waist elastic member, 25 ... contraction 29, leg circumference line, 30 ... elastic film, 31 ... through hole, 40 ... sheet joint, 70 ... non-stretchable area, 80 ... stretchable area, 90 ... solid gather, 93 ... lying part, 94 ... free part, 95: Gather sheet, 96: Gather elastic member, B: Rear body, ED: Stretching direction, XD: Orthogonal direction, F: Front body, L: Middle part, LD: Front-back direction, T: Trunk part, WD: Width Direction, 8 ... single film portion, 51 ... first region, 52,53 ... second region, 54 ... weakly stretchable region, D1 ... first direction, D2, D3 ... second direction, 35 ... slit, 36 ... continuous portion, P1 ... 1st site | part, P2 ... 2nd site | part, 36A ... 1st continuous part, 36B ... 2nd continuous part, 100 ... connection tape.

<Explanation of terms in the specification>
The following terms in the specification have the following meanings unless otherwise specified in the specification.
-"Front body" and "rear body" mean the front and rear portions of the pants-type disposable diaper in the front-rear direction center, respectively. Moreover, a crotch part means the front-back direction range containing the center of the front-back direction of a pants type disposable diaper, and when an absorber has a constriction part, it means the front-back direction range of the part which has the said constriction part.
・ "MD direction" and "CD direction" mean the flow direction (MD direction) in production equipment and the transverse direction (CD direction) perpendicular to this, and either one is the front-rear direction of the product. The other is the width direction of the product. The MD direction of the nonwoven fabric is the direction of fiber orientation of the nonwoven fabric. The fiber orientation is the direction along which the fibers of the nonwoven fabric are aligned. For example, the fiber orientation can be determined from the measurement method according to the TAPPI standard method T481, the fiber orientation test method using the zero-range tensile strength, It can be discriminated by a simple measuring method for determining the orientation direction.
-“Elastic limit elongation” means the elongation of the elastic limit in the expansion / contraction direction ED (in other words, the state in which the first sheet layer and the second sheet layer are completely expanded), and the length at the elastic limit is the natural length. Is expressed as a percentage with respect to 100%.
The “area ratio” means the ratio of the target portion to the unit area, and the target portion (for example, the sheet joint portion 40, the stretchable region 80, the non-stretchable region 70, the main stretchable portion, the buffer stretchable portion) in the target region. The total area of the through holes 31 and the vent holes is divided by the area of the target region and expressed as a percentage. In particular, the “area ratio” in the region having a stretchable structure is the elastic limit in the stretchable direction ED. It means the area ratio in the stretched state. In a form in which a large number of target portions are provided at intervals, it is desirable to set the target region to a size that includes 10 or more target portions and obtain the area ratio.
“Elongation rate” means a value when the natural length is 100%.
・ "Weight" is measured as follows. After the sample or test piece has been pre-dried, it is left in a test room or apparatus in a standard state (test location is temperature 23 ± 1 ° C., relative humidity 50 ± 2%) to a constant weight. Pre-drying refers to making a sample or test piece constant in an environment at a temperature of 100 ° C. In addition, it is not necessary to perform preliminary drying about the fiber whose official moisture content is 0.0%. From the test piece in a constant weight state, a sample plate (100 mm × 100 mm) is used to cut a sample having a size of 100 mm × 100 mm. Measure the weight of the sample, multiply it by 100 , calculate the weight per square meter , and use it as the basis weight.
・ "Thickness" of the absorber is a thickness measuring instrument (Peacock, dial thickness gauge large type, model JB (measurement range 0 to 35 mm) or model K-4 (measurement range 0 to 50 mm)) manufactured by Ozaki Mfg. Co., Ltd. Measure the sample and the thickness meter horizontally.
-"Thickness" other than the above is automatically measured using an automatic thickness measuring instrument (KES-G5 handy compression measurement program) under the conditions of load: 0.098 N / cm ² and pressure area: 2 cm ² .
・ "Tensile strength" and "tensile elongation (breaking elongation)" are in accordance with JIS K7127: 1999 "Plastic-Test method for tensile properties-" except that the test piece is rectangular with a width of 35 mm and a length of 80 mm. The initial chuck interval (distance between marked lines) is 50 mm, and the tensile speed is 300 mm / min.
・ "Elongation stress" means according to JIS K7127: 1999 "Plastics-Test method for tensile properties-" by a tensile test in which the initial chuck interval (distance between marked lines) is 50 mm and the tensile speed is 300 mm / min. This means the tensile stress (N / 35 mm) measured when stretching in the elastic region, and the degree of stretching can be appropriately determined depending on the test object. It is preferable that the test piece has a rectangular shape with a width of 35 mm and a length of 80 mm or more. However, when a test piece with a width of 35 mm cannot be cut out, the test piece is prepared with a width that can be cut out, and the measured value is 35 mm. The value converted to. Even if the target area is small and sufficient specimens cannot be collected, as long as the magnitude of the extension stress is compared, at least a comparison can be made even if the specimens of the same size are used even if they are appropriately small. .
-"Developed state" means a state where the plate is flattened without contraction or slack.
-Unless otherwise specified, the dimensions of each part mean dimensions in a deployed state, not a natural length state.
・ If there is no description about the environmental conditions in the test and measurement, the test and measurement shall be performed in a test room or equipment in the standard state (test location: temperature 23 ± 1 ° C, relative humidity 50 ± 2%). To do.

Claims (6)

An elastic film is laminated between the first sheet layer and the second sheet layer, and the first sheet layer and the second sheet layer are formed through a hole penetrating the elastic film at a plurality of joints arranged at intervals. Or having an elastic film stretchable structure joined via the elastic film,
In the disposable wearing article, the region having the elastic film stretchable structure has a stretchable region that elastically stretches with the elastic film.
The stretchable region has a single film portion that includes only one elastic film and does not have other elastic members. The single film portion includes a first region that stretches in a first direction and the first region with respect to the first region. A second region located in a direction orthogonal to the first direction and extending and contracting in a second direction oblique to the first direction,
A disposable wearing article characterized by the above. A front-rear torso part, a rear-body torso part, and an intermediate part located between the front and rear parts, or a front and rear separate exterior body;
It is attached to the exterior body, and includes an interior body that extends from the front body to the back body through the crotch part,
A pants-type disposable wear in which both sides of the exterior body in the front body and both sides of the exterior body in the back body are joined to form a side seal part, and a waist opening and a pair of left and right leg openings are formed. Goods,
At least one of the exterior body of the front body and the exterior body of the back body has the stretchable region at least on both sides in the width direction than the interior body, and the single film portion of the stretchable region is formed from the inside of the middle portion to the body. Extending around the circumference,
In the single film portion, the second region includes a portion along the base of the wearer's leg, and is provided so that the expansion and contraction direction is obliquely downward toward the center in the width direction. It is located on the waist opening side from the second region, and is provided so that the expansion / contraction direction is the width direction,
The disposable wearing article according to claim 1. A tape-type disposable wear comprising a front body and a back body, and a connecting tape extending from both sides of the back body, the connecting tape having a connecting portion detachably connected to the front body Goods,
The connecting tape has the stretchable region,
The single film portion of the stretchable region has the first region above the middle in the vertical direction of the connecting tape, and the second region below the first region,
The first region is provided such that the expansion / contraction direction is the width direction, and the second region is provided so as to be obliquely upward toward the tip side of the connecting tape,
The disposable wearing article according to claim 1. In the manufacturing method of the disposable wearing article according to any one of claims 1 to 3,
In forming the elastic film stretchable structure,
In a state where the elastic film is sandwiched between the first sheet layer and the second sheet layer while extending in the first direction, the elastic film penetrates through the elastic film at a plurality of spaced positions, or While joining the first sheet layer and the second sheet layer through an elastic film,
Prior to joining the first sheet layer and the second sheet layer, a slit or hole having a dimension in the orthogonal direction of 50 mm or more is formed in the middle of the orthogonal direction orthogonal to the first direction in the elastic film. , Leaving a continuous portion continuous in the first direction on both sides of the orthogonal direction than the slit or hole,
In the state where the elastic film having the slit or hole and the continuous portion is stretched in the first direction, the first sheet layer and the second sheet layer are joined.
The manufacturing method of the disposable wearing article characterized by the above-mentioned. In the manufacturing method of the disposable wearing article according to any one of claims 1 to 3,
In forming the elastic film stretchable structure,
In a state where the elastic film is sandwiched between the first sheet layer and the second sheet layer while extending in the first direction, the elastic film penetrates through the elastic film at a plurality of spaced positions, or While joining the first sheet layer and the second sheet layer through an elastic film,
Prior to joining the first sheet layer and the second sheet layer, the length in the orthogonal direction is set in the middle of the orthogonal direction in the elastic film with a gap in both the first direction and the orthogonal direction. A plurality of slits or holes of 50 mm or more are arranged, leaving a first continuous portion continuous in the first direction on both sides in the orthogonal direction with respect to the arrangement region of the slits or holes, and the slits or holes Leaving a second continuous portion that is continuous in the first direction in the interval portion in the orthogonal direction of the slit or hole in the arrangement region;
The elastic film having the slit or hole and the first continuous portion and the second continuous portion is bonded in the first sheet layer and the second sheet layer in a state of being stretched in the first direction.
The manufacturing method of the disposable wearing article characterized by the above-mentioned. A front-rear torso part, a rear-body torso part, and an intermediate part located between the front and rear parts, or a front and rear separate exterior body;
It is attached to the exterior body, and includes an interior body that extends from the front body to the back body through the crotch part,
A pants-type disposable wear in which both sides of the exterior body in the front body and both sides of the exterior body in the back body are joined to form a side seal part, and a waist opening and a pair of left and right leg openings are formed. A method for manufacturing an article, comprising:
The elastic film is continuously supplied in the MD direction, and the first sheet layer and the second sheet layer are continuously supplied in the MD direction on both the front and back sides, while the elastic film is extended in the MD direction. In a state of being sandwiched between the first sheet layer and the second sheet layer, the first sheet layer and the second sheet layer are penetrated through the elastic film or through the elastic film at a plurality of positions spaced apart from each other. A process of manufacturing an exterior body that integrally forms a part that becomes the exterior body of the front body and a part that becomes the exterior body of the back body by joining;
A manufacturing process of the interior body;
The part which becomes the exterior body of the front body after the part which becomes the exterior body of the front body and the part which becomes the exterior body of the back body, which are integrally formed by the manufacturing process of the exterior body, are cut out. And after dividing | segmenting into the part used as the exterior body of a back body, it is the same arrangement | positioning as the expansion | deployment state of the said disposable wearing article, and it conveys so that the width direction of a disposable wearing article may become MD direction, and space | interval is set to MD direction. And attaching the interior body manufactured in the manufacturing process of the interior body to form an interior assembly body in which the individual disposable wearing articles are continuous in the MD direction by assembling the interior body, ,
After the interior assembly is folded in the CD direction, the side seals are formed by joining a part that becomes the exterior body of the front body and a part that becomes the exterior body of the back body at the parts that are both sides of each disposable wearing article. Forming a portion, cutting a portion that becomes the outer body of the front body and a portion that becomes the outer body of the rear body at the boundary of each disposable wearing article, and obtaining individual disposable wearing articles, Including,
In the manufacturing process of the exterior body, as the elastic film, supply a single elastic film that extends from at least a part that becomes a waist part of the front body to a part that becomes a waist part of the back body,
Prior to joining the first sheet layer and the second sheet layer, out of the middle region of the elastic film in the CD direction, the first part serving as both side edges of the front body and both side edges of the back body, and The slit or hole having a dimension in the CD direction of 50 mm or more is formed in each of the second parts including the crotch part of the individual disposable wearing article,
Leaving the first continuous portion that continues in the MD direction outside the first portion in the CD direction, and the second continuous portion that continues in the MD direction between the first portion and the second portion in the CD direction; leave,
The manufacturing method of the disposable wearing article of Claim 5.

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