JP2015173751A - Pants-type disposable diaper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pants-type disposable diaper that is improved in fitting properties of the whole circumferential direction of a waist edge.SOLUTION: In the waist edge W of an exterior body 12 in a front body F of a pants-type disposable diaper, a second sheet material 12H is extended to an end of a waist opening WO side, a first sheet material 12S is folded back inside of the second sheet material 12H at an edge of the waist opening WO, and a waist edge resilient elastic member 17 is sandwiched between the first sheet material 12S and the second sheet material 12H in either one side of the inside and outside of the second sheet material 12H; and in the waist edge W of the exterior body 12 in a back body B, the second sheet material 12H is extended only to a downward position from the front end of the second sheet material 12H of the front body F, the first sheet material 12S is folded back inside at the edge of the waist opening WO, and at least a portion of the waist edge resilient elastic member 17 is sandwiched between the first sheet material 12S and second sheet material 12H in the waist opening WO side from the second sheet material 12H.

Description

  The present invention relates to a pants-type disposable diaper with improved fit at the waist edge.

  For example, a pants-type disposable diaper includes an exterior body that forms a front body and a back body, and an interior body that includes an absorbent body fixed to the inner surface of the exterior body, and the front body and the back body of the exterior body are on both sides. The waist opening and the pair of left and right leg openings are formed by being joined at the portion.

  In the pants-type disposable diaper, in order to improve the fit to the body, elongated elastic elastic members such as rubber thread are fixed in a stretched state along the circumferential direction at various locations on the exterior body, Forming a stretchable structure, among them, a waist edge elastic elastic member along the width direction at the edge of the waist opening, and a waist lower part along the width direction at the crotch side than the waist edge elastic elastic member A thing provided with an elastic expansion-contraction member has a comparatively high fit with respect to a body, and is used widely.

  Such a stretchable structure is basically based on the exterior body having a multi-layer structure and an elastic stretchable member built in between the layers. Then, hot melt adhesive is applied to one of the outer layer facing the outer side and the inner layer facing the inner side of the elastic expansion / contraction member, the outer layer and the inner layer are joined, and elastic expansion and contraction is applied to the outer layer and the inner layer. In order to reduce costs and improve flexibility by reducing the amount of hot melt adhesive used and the form of fixing the member, hot melt adhesive is applied to the peripheral surface over the entire length of the elastic expansion and contraction member between the outer layer and the inner layer. It is common to sandwich the outer layer and the inner layer and to fix the elastic elastic member to the outer layer and the inner layer.

  As the structure of the exterior body, conventionally, like the ones described in Patent Documents 1 and 2, the elastic elastic member is sandwiched between the first sheet material located outside and the second sheet material located inside, and the first sheet material is waisted A structure is generally used in which the folded portion is folded inward at the edge of the opening, the folded portion is extended to the end on the waist side of the interior body, and joined to the end on the waist side of the interior body. In the thing of patent document 1, since the 2nd sheet | seat material is extended to the edge of a waist opening part, it becomes a form from which sufficient rigidity and intensity | strength are obtained to the edge of a waist opening part, and patent document 2 description In this case, the second sheet material is separated from the edge of the waist opening to the leg side, and the amount of the second sheet material used can be reduced.

  However, the conventional pants-type disposable diaper has the following problems because the layer structure of the waist edge of the exterior body is the same in both the front body and the back body. That is, in a pants-type disposable diaper, the outer body of the front body is often grabbed and pulled up, and the waist edge is somewhat rigid so that the waist edge does not break during the pulling up and is easy to grip. Is higher, but considering the rigidity and strength required for the waist edge of the outer body of the front body, if the waist edge of the outer body of the rear body has a similar layer structure, the back body The waist edge of the exterior body becomes too rigid, and when the diaper is worn, the waist edge of the exterior body of the back body is easily caught by the swelling of the buttocks. The occurrence of such a catch is not preferable because it may cause breakage due to excessive pulling of the diaper or misleading the wearer that the size is not suitable.

  In addition, it is necessary to fit the waist edge of the outer body of the front body, including changes due to meals, against the swelling of the wearer's abdomen, and to increase the rigidity of the waist edge to prevent slippage Is an effective means, but the waist edge of the outer body of the back body fits a flat, low-aging part of the wearer's back and the bulge of the buttocks, with relatively little meat In contrast to the waist edge of the outer body of the front body, the fitting property decreases as the rigidity increases. Further, if the number of layers of the sheet material is increased in order to increase the rigidity, the air permeability is also lowered.

JP 2008-1332023 A JP 2013-70743 A

  Then, the main subject of this invention is to improve the fitting property of the whole circumferential direction of a waist edge part.

The present invention that has solved the above problems is as follows.
<Invention of Claim 1>
An exterior body constituting the front body and the back body, and an interior body including an absorbent body fixed to the inner surface of the exterior body,
A side seal portion is formed by joining both sides of the outer body of the front body and both sides of the outer body of the rear body, so that the waist portion is formed in an annular shape, and the waist opening and the pair of left and right Leg openings are formed,
At least the waist edge portion of the exterior body is provided with a first sheet material forming the outer surface of the diaper, a second sheet material facing the inner surface of the first sheet material, and spaced apart from each other along the width direction. In a pants-type disposable diaper comprising a plurality of elongated waist edge elastic elastic members,
At the waist edge of the exterior body in the front body, the second sheet material extends to the end on the waist opening side, and the first sheet material is inside the second sheet material at the edge of the waist opening. The waist edge elastic elastic member is sandwiched between the first sheet material and the second sheet material on either the inside or outside of the second sheet material,
At the waist edge of the exterior body in the rear body, the second sheet material extends only to a position below the front end of the second sheet material in the front body, and the first sheet material is the waist. Folded at the edge of the opening, and at least part of the waist edge elastic elastic member is sandwiched between the first sheet material on the waist opening side of the second sheet material,
A pants-type disposable diaper characterized by that.

(Function and effect)
In the present invention, at the waist edge of the outer body of the front body, the end of the waist opening side is an area of a three-layer structure composed of the second sheet material and the first sheet material located on both the inside and outside. On the other hand, since the second sheet material extends only to a position lower than that of the front body at the waist edge of the outer body of the rear body, the waist opening is formed from the rear end of the second sheet material. The side is a two-layer structure formed by folding the first sheet material (front-rear asymmetric structure). Therefore, the waist edge of the outer body of the front body is made relatively rigid, and the rigidity of the waist edge of the outer body of the rear body is made lower while ensuring the fit suitable for the swelling of the wearer's abdomen. Thus, it is possible to ensure fit suitable for a portion between the back of the wearer and the bulge of the buttocks (a flat portion with little change with time and relatively little meat). That is, the fitting property of the whole circumferential direction of a waist edge part can be improved. Moreover, it can also avoid that the air permeability of the waist edge part of the exterior body of a back body falls.

<Invention of Claim 2>
At the waist edge of the outer body of the front body, the folded portion of the first sheet material that is folded inside the second sheet material is formed of the second sheet material by an adhesive applied in a continuous pattern. The pants-type disposable diaper according to claim 1, which is adhered to an outer surface.

(Function and effect)
As a means for fixing the folded portion of the first sheet material in the front body, by applying an adhesive in a continuous pattern, the rigidity at the waist of the outer body of the front body is increased by utilizing the rigidity improving action by adhesion. Can be higher.

<Invention of Claim 3>
The outer surface of the exterior body of the back body is provided with a post-treatment tape for rounding and fixing after use, and the second sheet material of the exterior body of the back body is closer to the waist opening than the post-treatment tape. The pants type disposable diaper according to claim 1 or 2, wherein

(Function and effect)
Post-treatment tapes are widely used in which a base material made of a resin sheet is coated with an adhesive, and the post-treatment tape is mainly provided on the exterior body of the back body. However, if the corners and edges of such a post-processing tape are arranged at a thin portion of the outer body of the back body, there is a possibility that the wearer's skin may be indirectly contacted to deteriorate the wearing feeling. Therefore, even if the waist edge portion has a low rigidity by separating the second sheet material from the edge of the waist opening portion in the exterior body of the back body as described above, the second sheet material is opened to the waist more than the post-processing tape. It is preferable to use the part side.

<Invention of Claim 4>
The underpants type disposable of any one of Claims 1-3 in which the rear end of the said 2nd sheet material in the said exterior body of the back body is located below the lowest waist edge elastic elastic member. Diapers.

(Function and effect)
As a result, the waist edge of the outer body of the front body is made relatively rigid, while the entire waist edge of the exterior body of the back body is made relatively low-rigid, and between the wearer's back and the bulge of the buttock It is possible to improve the fit to the part (part which is flat and has little change with time and has relatively little meat).

<Invention of Claim 5>
Any one of the said 1st sheet | seat material and 2nd sheet | seat material is the spun bond nonwoven fabric which uses the fiber of a polypropylene or its copolymer, or the core-sheath fiber which made the core component of polypropylene a constituent fiber. A pants-type disposable diaper according to item 1.

(Function and effect)
The nonwoven fabric is excellent in strength and flexibility, but because it is flexible, the waist edge portion of the outer body of the front body tends to be insufficient in rigidity, and the rigidity of the waist edge portion tends to be lost. Therefore, the present invention is particularly preferable when applied to an exterior body using such a flexible nonwoven fabric.

<Invention of Claim 6>
An inner layer facing the inside of the waist edge elastic elastic member and an outer layer facing the outer side of the waist edge elastic elastic member formed of at least one of the first sheet material and the second sheet material. And
The inner layer and the outer layer are intermittently arranged in the width direction, joined by an adhesive or welding process continuous in the direction crossing the width direction, and a sheet joint is formed,
The waist edge elastic elastic member is fixed to at least one of the inner layer and the outer layer at a position intersecting with the sheet joint portion,
As the inner elastic layer and the outer layer contract with the contraction of the elastic member at the waist edge, the portions located between the sheet joints in the inner layer and the outer layer swell in opposite directions to form creases, respectively. And
The waist edge part which does not have the sheet joint part and the waist edge elastic elastic member at the end part on the waist opening part side of the waist edge part of the exterior body, and whose longitudinal range is located closest to the waist opening part side With a non-joint / non-elastic elastic member region wider than the interval between the elastic elastic member and the waist edge elastic elastic member adjacent thereto,
The underpants type disposable diaper of any one of Claims 1-5.

(Function and effect)
In a conventional pants-type disposable diaper, there is almost no non-bonded / inelastic elastic member region at the end of the waist edge on the side of the waist opening. Therefore, in such a waist edge, a longitudinal continuous joining form in which a large number of sheet joint portions are formed by continuous adhesion processing in the direction intersecting the width direction and the inner layer and the outer layer in the width direction (for example, When Japanese Patent Application Laid-Open No. 2010-22588 is adopted, the following problems occur. That is, the longitudinal continuous joining form is applied to a general waist edge stretch structure in which the elastic stretch member is arranged as close as possible to the edge of the waist opening, although the heel extends straight, looks good and has excellent air permeability. The rigid sheet joint will continue in the vertical direction to the edge of the waist opening, and the dense shrinkage will continue firmly in the vertical direction to form highly rigid wavy irregularities on the edge of the waist opening. As a result, the feeling of wearing at the waist edge deteriorates.
On the other hand, when the non-joint / inelastic elastic member region is secured widely at the edge of the waist opening as described above while adopting the longitudinal continuous joining form at the waist edge, the end on the waist opening side The portion has no hard sheet joint portion, and the shrinkage wrinkle is larger and softer than the region having the elastic elastic member at the waist edge, and the feeling of wearing at the waist edge becomes good. Moreover, since the waist edge portion of the exterior body has a longitudinal continuous joining form other than the end portion on the waist opening side, the shrinkage ridge formed on the waist edge portion by the shrinkage of the waist edge elastic elastic member, Since an end portion on the side of the waist opening is largely sparse, the air permeability in the vertical direction due to the shrinkage wrinkles is hardly impaired.

<Invention of Claim 7>
The distance from the edge of the waist opening to the tip of the seat joint on the side of the waist opening is 3 to 15 mm, and the elastic elastic member of the waist edge located on the most waist opening side from the edge of the waist opening The underpants type disposable diaper of Claim 6 whose distance to is 5-20 mm.

(Function and effect)
The distance from the edge of the waist opening to the tip of the seat joint on the side of the waist opening is less than 3 mm, or the distance from the edge of the waist opening to the waist edge elastic elastic member located closest to the waist opening If it is less than 5 mm, the rigidity of the wavy irregularities formed at the edge of the waist opening tends to increase. In addition, when the distance from the edge of the waist opening to the tip of the seat joint on the side of the waist opening exceeds 15 mm, there is no change in the effect of improving the feeling of wearing the waist edge, Since the wrinkles formed in the film are likely to be irregular, it is not preferable. Moreover, when the distance from the edge of a waist opening part to the waist edge elastic elastic member located in the waist opening part side most exceeds 20 mm, since the fit feeling of a waist edge part falls, it is unpreferable.

<Invention of Claim 8>
The sheet joint is formed by the adhesive,
Among the portions where the sheet joint portion and the waist edge elastic elastic member intersect, the adhesive is continued in the direction intersecting the width direction on the inner layer side and the outer layer side of the waist edge elastic elastic member. By this, the waist edge elastic elastic member is fixed to the inner layer and the outer layer by the adhesive,
The pants-type disposable diaper according to claim 6 or 7.

(Function and effect)
In this way, the waist edge elastic elastic member can be firmly fixed by the continuous presence of the adhesive on both the inner layer and the outer layer.

<Invention of Claim 9>
The underpants type according to any one of claims 6 to 8, wherein a dimension in the width direction of each sheet joint portion is 0.5 to 4 mm, and an interval in the width direction between adjacent sheet joint portions is 4 to 8 mm. Disposable diapers.

(Function and effect)
In this way, based on the longitudinal continuous joining form, and combining the distance between adjacent sheet joining portions and the widthwise dimension of each sheet joining portion within a specific range, the height and collapse are sufficient even though they should extend straight. It is possible to achieve both difficulty. The dimension in the width direction of each sheet joint portion affects the interval between adjacent ridges, and when the fold formed is thin as in the case of the longitudinal continuous joining form, if this width exceeds 4 mm, it is adjacent. Not only does the gap between the ridges become too wide, the individual ridges look independent, but when the folds collapse or spread due to the compressive force in the thickness direction, the action of supporting neighboring ridges weakens As a result, the resistance to deformation or the restoration after the change is weakened, and as a result, the feeling of discomfort becomes insufficient.

  In addition, when the dimension in the width direction of the sheet joining portion is simply set to 0.5 to 4 mm, and the interval between adjacent sheet joining portions is less than 4 mm or more than 8 mm, the following occurs. That is, the interval between adjacent sheet joints affects the height and width of the ridges, and if the interval between adjacent sheet joints is about 2 mm, the continuity in the vertical direction is the same as when continuously joined in the width direction. 3mm, the ridges extend straight in the direction perpendicular to the width direction, but it can be expected that adjacent ridges will support each other. The feeling of fun is not enough. Moreover, if the space | interval of a sheet | seat junction part exceeds 8 mm, a wrinkle will be crushed irregularly by compression at the time of packaging, and the appearance of a product will worsen. On the other hand, when the width dimension of the sheet joint portion is 0.5 to 4 mm and the interval between the sheet joint portions is 4 to 8 mm, a sufficient feeling of warmth can be obtained. The wrinkles are not easily crushed by the compression.

  In the present invention, the adhesive for forming the sheet joint portion is continuous. In the portion where the sheet joint portion and the waist edge elastic elastic member intersect, the inner layer side and the outer layer of the waist edge elastic elastic member. In addition to the form in which the adhesive continues in the direction intersecting the width direction on both sides, the adhesive continues on either side because the waist edge elastic elastic member is interposed, but intersects the width direction on the other side A form in which the adhesive is discontinuous in the direction is also included.

  Further, in the present invention, the welding process for forming the sheet bonding portion is continuous, as long as the welding mark is continuous on at least one of the inner layer and the outer layer, the inner layer and the outer layer, the waist edge elastic elastic member, Are welded continuously by the inner layer and the outer layer being indirectly welded, and the waist edge elastic elastic member is formed at the portion where the sheet joint portion and the waist edge elastic elastic member intersect. A form in which welding between the inner layer and the outer layer is not continuous due to the interposition is included. If the sheet bonded portion is formed by welding in the longitudinal continuous bonding form, hardening of the welded portion is inevitable, but if the size of the sheet bonded portion is within the above range, the influence of hardening becomes small. Further, as a secondary effect, the transparency of the welded portion is increased, and an appearance in which the glossy welded portion forms a stripe pattern is obtained.

  In addition, the waist edge elastic elastic member is fixed to the sheet at a position where it intersects with the sheet joint portion, and the position where the waist edge elastic elastic member and the sheet joint portion intersect with each other. Not only is the sheet bonded to the sheet (in addition to bonding with an adhesive, including welding, the same applies hereinafter), but the waist edge elastic elastic member and the sheet are not bonded, but the direction intersecting the width direction. As a result of the width of the sheet joint portion being narrower than the natural length of the waist edge elastic elastic member, the waist edge elastic elastic member is fixed by being sandwiched between the sheet joint portions. A mode is also included in which the contraction force of the member is transmitted to the sheet at a position where it intersects with the sheet joint. The latter form is, for example, the form described in Japanese Patent Application Laid-Open Nos. 2008-154998 and 2009-106667, and the Patent Documents 1 to 3 are disclosed in that the design position of the side portion of the elastic member passes through the sheet joint portion. Different from those described.

<Invention of Claim 10>
The underpants type disposable diaper according to any one of claims 1 to 9, wherein an interval between adjacent waist edge elastic elastic members is 10 mm or less.

(Function and effect)
In the case of the present invention, when the interval (not the center interval) between the adjacent waist edge elastic elastic members exceeds 10 mm, the thickness of the heel changes in the direction intersecting the width direction, although not as long as the longitudinal intermittent joining form. It becomes a cloud shape or a waveform. Therefore, in this invention, it is preferable that the space | interval of adjacent waist edge elastic elastic members shall be 10 mm or less.

<Invention of Claim 11>
Each said inner and outer layers, thickness 0.1 to 1 mm, a nonwoven fabric having a basis weight of 10 to 20 g / m ^2, pants-type disposable diaper according to any one of claims 1 to 10.

(Function and effect)
The present invention is particularly suitable for such inner and outer layers.

<Invention of Claim 12>
The underpants type disposable diaper according to any one of claims 1 to 11, wherein the waist edge elastic elastic member has a stretch ratio of 200 to 350% in a state where the waist edge is fully developed in the width direction.

(Function and effect)
By adopting such an elongation rate, the above-described effects of the present invention become more remarkable. The elongation rate means a value when the natural length is 100%.

<Invention of Claim 13>
The pants type disposable according to any one of claims 1 to 12, wherein the inner layer and the outer layer are non-woven fabrics having a bending resistance in the width direction higher than a bending resistance in a direction orthogonal to the width direction. Diapers.

(Function and effect)
Nonwoven fabric is suitable for the inner layer and the outer layer. In this case, if the bending resistance in the width direction is low, the wrinkles become thin and sharp and easy to collapse, and the compressibility in the thickness direction is poor. Become. In order to improve this, it is conceivable to increase the basis weight of the non-woven fabric, but there is a possibility that the softness when touched may be poor even if the appearance is stiff (because the rigidity is improved too much). On the other hand, when a non-woven fabric having a higher bending strength in the width direction than the bending strength in the direction perpendicular to the width direction is used for the inner layer and the outer layer, the wrinkles become round and easy to swell and become rich in compression recovery in the thickness direction. At the same time, the heels are less likely to fall down and become softer when touched.

  As described above, according to the present invention, there are advantages such as improvement in the fit of the entire circumferential direction of the waist edge.

It is a top view in the state where the diaper was developed showing the inside of a pants type disposable diaper. It is a top view in the state where the diaper was developed showing the outer surface of a pants type disposable diaper. FIG. 3 is a 3-3 cross-sectional view of FIG. 1. FIG. 4 is a sectional view taken along the line 4-4 in FIG. 1. FIG. 5 is a sectional view taken along line 5-5 in FIG. 1. (A) a plan view in an unfolded state, and (b) a 6-6 cross-sectional view in a natural length state, (c) a 6-6 cross-sectional view in an extended state, and (d) a 7-7 cross-sectional view showing a stretchable structure. (E) It is sectional drawing equivalent to 7-7 cross section of a back side. It is sectional drawing which shows only the principal part of a pants type disposable diaper. It is a perspective view of a pants type disposable diaper. It is a top view in the state where the diaper was developed showing the outer surface of a pants type disposable diaper. It is a top view in the state where the diaper was developed showing the outer surface of a pants type disposable diaper. It is a longitudinal cross-sectional view of an exterior body. (A) a plan view in an unfolded state, and (b) a 6-6 cross-sectional view in a natural length state, (c) a 6-6 cross-sectional view in an extended state, and (d) a 7-7 cross-sectional view showing a stretchable structure. (E) It is sectional drawing equivalent to 7-7 cross section of a back side. It is a longitudinal cross-sectional view of an exterior body. (A) a plan view in an unfolded state, and (b) a 6-6 cross-sectional view in a natural length state, (c) a 6-6 cross-sectional view in an extended state, and (d) a 7-7 cross-sectional view showing a stretchable structure. (E) It is sectional drawing equivalent to 7-7 cross section of a back side. It is a top view which shows the principal part of (a) expansion | extension state and (b) contraction state. It is a comparative photograph of the partial sample of the waist edge W. It is a comparative photograph of the partial sample of the waist edge W. (A) a plan view in an unfolded state, (b) an 8-8 cross-sectional view in a natural length state, (c) a 6-6 cross-sectional view in a natural length state, and (d) a 7-7 cross section, showing a conventional telescopic structure FIG. It is a schematic diagram of adhesion equipment. It is a micrograph.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
1 to 8 show an example 100 of a pants-type disposable diaper. The pants-type disposable diaper 100 includes an exterior body 12 that forms the outer surface (back surface) of the product, and an interior body 200 that is attached to the inner surface of the exterior body 12. Symbol Y indicates the total length of the diaper, and symbol X indicates the total width of the diaper.

  The interior body 200 is a part that absorbs and holds excrement such as urine, and the exterior body 12 is a part that is worn by the wearer. In addition, the dot pattern part in sectional drawing has shown the junction part which joins each structural member, and is formed by solid, beads, curtains, summits, spiral application, etc., such as a hot-melt-adhesive. The “front-rear direction” means the direction connecting the ventral side (front side) and the back side (rear side), “width direction” means the direction (left-right direction) orthogonal to the front-rear direction, and “up-down direction "In the state of wearing the diaper 100, that is, the direction perpendicular to the waistline direction when the diaper 100 is folded in two at the crotch so that both sides of the front body and the back body of the diaper 100 overlap each other, in other words, For example, it means a direction connecting the waist opening WO side and the crotch side.

(Interior body)
The interior body 200 can take any shape, but is rectangular in the illustrated form. As shown in FIGS. 3 to 5, the interior body 200 includes a surface sheet 30 on the body side, a liquid-impermeable sheet 11, and an absorption element 50 interposed therebetween. Yes, it is the main body that takes up the absorption function. Reference numeral 40 denotes an intermediate sheet (second sheet) provided between the top sheet 30 and the absorbent element 50 in order to quickly transfer the liquid that has passed through the top sheet 30 to the absorbent element 50. Shows a three-dimensional gather 60 that stands on the body side and is provided on both sides of the interior body 200 in order to prevent excrement from leaking to both sides of the interior body 200.

(Surface sheet)
The top sheet 30 has a property of transmitting liquid, and examples thereof include a porous or non-porous nonwoven fabric, a porous plastic sheet, and the like. Of these, 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. For example, if flexibility and drapeability are required, the spunbond method and spunlace method are preferable. If bulkiness and softness are required, the air-through method, point bond method, and thermal bond method are preferable processing methods. .

  Further, the top sheet 30 may be composed of one sheet or may be composed of a laminated sheet obtained by bonding two or more sheets. Similarly, the top sheet 30 may be composed of one sheet or two or more sheets in the planar direction.

  When the three-dimensional gather 60 is provided, both sides of the top sheet 30 pass between the liquid-impermeable sheet 11 and the three-dimensional gather 60 to the back side of the absorbent element 50 to prevent the liquid from penetrating. It is preferable to adhere to the impermeable sheet 11 and the three-dimensional gather 60 with a hot melt adhesive or the like.

(Intermediate sheet)
An intermediate sheet (also referred to as “second sheet”) 40 having a higher liquid permeation rate than the top sheet 30 can be provided to quickly transfer the liquid that has passed through the top sheet 30 to the absorber. This intermediate sheet 40 not only improves the absorption performance of the absorbent by quickly transferring the liquid to the absorbent body, but also prevents the “reversed” phenomenon of the absorbed liquid from the absorbent body, so that the top sheet 30 is always dried. It can be made into the state which carried out. The intermediate sheet 40 can be omitted.

Examples of the intermediate sheet 40 include the same material as the top sheet 30, spunlace, spunbond, SMS, pulp nonwoven fabric, mixed sheet of pulp and rayon, point bond, or crepe paper. In particular, an air-through nonwoven fabric is preferable because it is bulky. It is preferable to use a core-sheath composite fiber for the air-through nonwoven fabric. In this case, the resin used for the core may be polypropylene (PP), but polyester (PET) having high rigidity is preferable. Basis weight is preferably ^{20~80g / m 2, 25~60g / m} 2 is more preferable. The thickness of the raw fiber of the nonwoven fabric is preferably 2.2 to 10 dtex. In order to make the nonwoven fabric bulky, it is also preferable to use an eccentric fiber, a hollow fiber, or an eccentric and hollow fiber that does not have a core at the center as the mixed fiber of all or part of the raw fiber.

  The intermediate sheet 40 in the illustrated form is disposed in the center shorter than the width of the absorber 56, but may be provided over the entire width. The length of the intermediate sheet 40 in the longitudinal direction may be the same as the length of the absorbent body 56 or may be within a short length range centered on the region that receives the liquid.

(Liquid impervious sheet)
The material of the liquid-impermeable sheet 11 is not particularly limited. For example, a plastic film made of an olefin resin such as polyethylene or polypropylene, a laminated nonwoven fabric provided with a plastic film on the surface of the nonwoven fabric, or a plastic film For example, a laminated sheet in which a nonwoven fabric or the like is laminated and bonded to each other can be exemplified. For the liquid-impermeable sheet 11, it is preferable to use a liquid-impervious and moisture-permeable material that has been preferred in recent years from the viewpoint of preventing stuffiness. As a plastic film having moisture permeability, a microporous plastic film obtained by kneading an inorganic filler in an olefin resin such as polyethylene or polypropylene, forming a sheet, and then stretching in a uniaxial or biaxial direction. Is widely used. In addition, non-woven fabric using microdenier fiber, enhancement of leakproofness by reducing the voids of the fiber by applying heat or pressure, application of superabsorbent resin or hydrophobic resin or water repellent Thus, a sheet that is liquid-impermeable without using a plastic film can also be used as the liquid-impermeable sheet 11.

  The liquid-impermeable sheet 11 is preferably extended around both sides of the absorbent element 50 to both sides of the side surface 30 of the absorbent element 50 in order to improve leakage prevention. The width of this extended portion is suitably about 5 to 20 mm on each of the left and right sides.

  Moreover, the excretion indicator from which a color changes by absorption of a liquid part can be provided in the inner side of the liquid-impermeable sheet 11, especially the absorber 56 side surface.

(Three-dimensional gather)
The three-dimensional gather 60 is a belt-like member that extends over the entire front-rear direction along both side portions of the interior body 200, blocks urine and soft stool that move in the lateral direction along the top sheet 30, and prevents side leakage. It is provided for this purpose. The three-dimensional gather 60 of the present embodiment is provided so as to stand up from the side portion of the interior body 200, the base side portion rises obliquely toward the center in the width direction, and the tip side portion from the intermediate portion has a width. It stands up diagonally outward in the direction.

  More specifically, the three-dimensional gather 60 folds the belt-shaped gather sheet 62 having a length equal to the length in the front-rear direction of the interior body 200 in the width direction and folds it into two. In addition, a plurality of elongated elastic elastic members 63 are fixed along the longitudinal direction at intervals in the width direction. An end portion of the three-dimensional gather 60 opposite to the folded portion in the width direction is an attachment portion 65 fixed to the back surface of the side edge portion of the interior body 200, and portions other than the attachment portion 65 protrude from the attachment portion 65. It is set as the protrusion part 66 (part by the side of a folding | turning part). Further, both end portions in the front-rear direction of the protruding portion 66 extend from the mounting portion 65 to the side surface of the topsheet 30 through the side portion of the interior body 200 and are hot-melted to the side surface of the topsheet 30. The base side portion is fixed to the front and rear fixing portion 67 by an adhesive or heat seal, and the tip side portion is folded back outward in the width direction from the tip of the base side portion and fixed to the base side portion. An intermediate part in the front-rear direction of the protruding part is an unfixed free part (inner free part), and an elongated elastic member 63 extending in the front-rear direction is fixed to the free part in an extended state.

The gather sheet 62 is made of a spunbond nonwoven fabric (SS, SSS, etc.), SMS nonwoven fabric (SMS, SSMMS, etc.), a melt-blown nonwoven fabric with excellent uniformity and concealment, and water repellent with silicon as necessary. A treated product can be suitably used, and the fiber basis weight is preferably about 10 to 30 g / m ² . As the elongated elastic elastic member 63, rubber thread or the like can be used. When spandex thread rubber is used, the thickness is preferably 470 to 1240 dtex, more preferably 620 to 940 dtex. The elongation rate at the time of fixation is preferably 150 to 350%, more preferably 200 to 300%. The term “elongation rate” means a value when the natural length is 100%. Further, as shown in the drawing, a waterproof film 64 can be interposed between the gather sheets folded in two.

  2-6 are preferable and, as for the number of the elongate elastic expansion-contraction members 63 provided in the free part of the three-dimensional gather 60, 3-5 are more preferable. The arrangement interval 60d is suitably 3 to 10 mm. If comprised in this way, in the range which has arrange | positioned the elongate elastic expansion-contraction member 63, it will become easy to contact | abut with respect to skin. The elongated elastic elastic member 63 may be disposed not only at the distal end side but also at the base side.

  The fixing target of the attachment portion 65 of the three-dimensional gather 60 can be an appropriate member such as the top sheet 30, the liquid-impermeable sheet 11, and the absorbent element 50 in the interior body 200.

  In the three-dimensional gather 60 thus configured, the contraction force of the elongated elastic elastic member 63 acts so that both ends in the front-rear direction are brought close to each other, but the both ends in the front-rear direction of the protruding portion 66 are fixed so as not to stand up. On the other hand, since they are non-fixed free portions, only the free portions stand up against the body side as shown in FIG. In particular, when the attachment portion 65 is positioned on the back surface side of the interior body 200, the three-dimensional gather 60 stands up so as to open outward in the width direction at the crotch portion and in the vicinity thereof. It comes in contact, and the fit is improved.

  The dimensions of the three-dimensional gather 60 can be determined as appropriate. In the case of an infant paper diaper, for example, as shown in FIG. 7, the standing height of the three-dimensional gather 60 (the length in the width direction of the protruding portion 66 in the unfolded state) 66w is It is preferably 15 to 60 mm, particularly 20 to 40 mm. Moreover, it is preferable that the separation distance 60x between the innermost folds in a state where the three-dimensional gather 60 is folded flat so as to be parallel to the surface of the topsheet 30 is 60 to 190 mm, particularly 70 to 140 mm.

  Note that, unlike the illustrated embodiment, the three-dimensional gathers can be provided in double (two rows) on the left and right sides of the interior body 200.

(Absorption element)
The absorbent element 50 includes an absorbent body 56 and a packaging sheet 58 that wraps the entire absorbent body 56. The packaging sheet 58 can be omitted.

(Absorber)
The absorber 56 can be formed of an aggregate of fibers. As this fiber assembly, a filament assembly obtained by opening, as necessary, synthetic fiber tows (fiber bundles) such as cellulose acetate as well as short fibers such as cotton-like pulp and synthetic fibers Can also be used. The fiber basis weight can be set to, for example, about 100 to 300 g / m ² when cotton-like pulp or short fibers are stacked, and in the case of a filament aggregate, for example, about 30 to 120 g / m ^2. Can do. The fineness in the case of a synthetic fiber is 1-16 dtex, for example, Preferably it is 1-10 dtex, More preferably, it is 1-5 dtex. In the case of a filament aggregate, the filament may be a non-crimped fiber, but is preferably a crimped fiber. The crimped degree of the crimped fiber can be, for example, 5 to 75, preferably 10 to 50, and more preferably about 15 to 50 per inch. Further, a crimped fiber that is uniformly crimped is often used. It is preferable to disperse and hold superabsorbent polymer particles in the absorber 56.

  The absorber 56 may have a rectangular shape, but as shown in FIG. 1, as shown in FIG. 1, the hourglass has a front end portion, a rear end portion, and a narrow portion narrower than the front end portion and the rear end portion. The shape is preferable because the fit of the absorber 56 itself and the three-dimensional gather 60 around the legs is improved.

  Moreover, although the dimension of an absorber can be determined suitably, it is preferable to extend to the peripheral part of the interior body, or its vicinity in the front-back direction and the width direction. Reference numeral 56X indicates the width of the absorber 56.

(Superabsorbent polymer particles)
The absorber 56 can contain superabsorbent polymer particles in a part or all thereof. Superabsorbent polymer particles include “powder” in addition to “particles”. As the particle diameter of the superabsorbent polymer particles, those used in this type of absorbent article can be used as they are, and those having a particle size of 1000 μm or less, particularly 150 to 400 μm are desirable. The material of the superabsorbent polymer particles can be used without any particular limitation, but those having a water absorption of 40 g / g or more are suitable. High-absorbent polymer particles include starch-based, cellulose-based, and synthetic polymer-based starch-acrylic acid (salt) graft copolymers, saponified starch-acrylonitrile copolymers, and sodium carboxymethylcellulose crosslinks. Or an acrylic acid (salt) polymer can be used. As the shape of the superabsorbent polymer particles, a commonly used granular material is suitable, but other shapes can also be used.

  As the superabsorbent polymer particles, those having a water absorption rate of 40 seconds or less are preferably used. When the water absorption speed exceeds 40 seconds, so-called reversion in which the liquid supplied into the absorber 56 returns to the outside of the absorber 56 is likely to occur.

  Further, as the superabsorbent polymer particles, those having a gel strength of 1000 Pa or more are preferably used. Thereby, even if it is a case where it is set as the bulky absorber 56, the sticky feeling after liquid absorption can be suppressed effectively.

The basis weight of the superabsorbent polymer particles can be appropriately determined according to the amount of absorption required for the use of the absorber 56. Therefore, although it cannot be said unconditionally, it can be set to 50 to 350 g / m ² . If the amount of polymer is less than 50 g / m ^2, it is difficult to secure the absorption amount. When it exceeds 350 g / m ² , the effect is saturated.

  If necessary, the superabsorbent polymer particles can adjust the spraying density or spraying amount in the plane direction of the absorber 56. For example, it is possible to increase the application amount of the liquid excretion site as compared to other sites. When gender differences are taken into account, men can increase the front spray density (amount), while women can increase the center spray density (amount). In addition, a portion where no polymer exists locally (for example, in a spot shape) in the planar direction of the absorber 56 can also be provided.

(Packaging sheet)
When the packaging sheet 58 is used, as the material, tissue paper, particularly crepe paper, non-woven fabric, polylaminated non-woven fabric, a sheet with small holes, or the like can be used. However, it is desirable that the superabsorbent polymer particles be a sheet that does not escape. When a nonwoven fabric is used in place of the crepe paper, a hydrophilic SMS nonwoven fabric (SMS, SSMMS, etc.) is particularly suitable, and the material can be polypropylene, polyethylene / polypropylene composite material, or the like. The basis weight is preferably 5 to 40 g / m ² , particularly 10 to 30 g / m ² .

  The packaging form of the packaging sheet 58 can be determined as appropriate, but from the viewpoint of ease of manufacture and prevention of leakage of the superabsorbent polymer particles from the front and rear end edges, the cylinder is formed so as to surround the front and back surfaces and both side surfaces of the absorbent body 56. It is preferable that the front and rear edges of the absorbent body 56 are protruded from the front and back of the absorbent body 56, and the protruding portions are crushed in the front and back directions and joined by a joining means such as a hot melt adhesive.

(Exterior body)
The exterior body 12 has a part constituting a front body F extending from the crotch part to the abdomen and a part constituting a rear body B extending from the crotch part to the back side, and both sides of the front body F As shown in FIG. 8, a waist opening WO for passing the wearer's torso and a pair of left and right leg openings LO for passing the legs are formed. It is what. Reference numeral 12A denotes a joining portion (hereinafter, this portion is also referred to as a side seal portion). The crotch portion means the center in the front-rear direction from the waist edge of the front body F to the waist edge of the back body B in the unfolded state, and the front side part and the back side part thereof are the front body F and the back body part. B means each.

  The exterior body 12 includes a waist portion T defined as a front-rear direction range extending from the waist opening WO to the upper end of the leg opening LO, and a front-rear direction range of a portion forming the leg opening LO (a side seal portion 12A of the front body F). And an intermediate portion L defined as a front / rear direction region having the side seal portion 12A of the back body B. The waistline portion T can be divided into a waist edge W that conceptually forms the edge of the waist opening and a waist lower portion U that is a portion below the waist edge W. Usually, when the waist circumference portion T has a boundary where the stretching stress in the width direction changes (for example, the thickness or elongation rate of the elastic stretch member changes), the waist opening WO side is closer to the waist opening WO side boundary. When it becomes the waist edge W and there is no such boundary, the waist opening WO side becomes the waist edge W from the absorbent body 56 or the interior body 200. These lengths in the vertical direction vary depending on the size of the product and can be determined as appropriate. For example, the waist edge W may be 15 to 40 mm, and the waist lower portion U may be 65 to 120 mm. On the other hand, both side edges of the intermediate portion L are bundled along the circumference of the wearer's leg, and this is a portion into which the wearer's leg is put. As a result, the exterior body 12 has a substantially hourglass shape as a whole. The degree of tightness of the exterior body 12 can be determined as appropriate. In order to obtain a clean appearance as shown in FIGS. Although it is preferable, the narrowest part may be determined so as to be equal to or larger than the width of the interior body 200.

  As shown in FIGS. 5 and 6, the exterior body 12 is formed by joining two sheet materials 12S and 12H, and the first sheet material 12S located outside is formed at the edge of the waist opening WO. The folded portion 12r extends inward so as to cover the end of the interior body 200 on the waist side.

  The sheet materials 12S and 12H can be used without particular limitation as long as they are in sheet form, but are preferably non-woven fabrics. 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.

  And in the exterior body 12, in order to improve the fit with respect to the trunk periphery, an elongated elastic elastic member such as rubber thread between the inner layer 21 and the outer layer 22 formed by at least one of the sheet materials 12S and 12H. 19 (a waist edge elastic elastic member 17, a waist lower elastic elastic member 15, and an intermediate elastic elastic member 16 described later) are provided at a predetermined elongation rate. As the elongated elastic elastic member 19, synthetic rubber or natural rubber may be used. In the form shown in FIG. 5, the outer edge layer 22 is formed of the first sheet material 12 </ b> S in the waist edge portion of the outer body 12 of the front body F as shown in FIG. As shown in FIG. 6 (e), the outer edge 22 of the diaper in the first sheet material 12S is formed on the waist edge of the outer body 12 of the back body B, which is formed of the second sheet material 12H. The inner layer 21 is formed by a portion folded inside the first sheet material 12S. In other parts, the outer layer 22 is formed of the first sheet material 12S and the inner layer 21 is formed of the second sheet material 12H.

More specifically, between the inner layer 21 and the outer layer 22 at the waist edge W, a plurality of waist edge elastic elastic members 17 are vertically spaced and predetermined so as to be continuous over the entire width direction. It is being fixed in the state extended | stretched along the width direction with the expansion | extension rate of. In addition, one or more of the waist edge elastic elastic members 17 disposed in a region adjacent to the waist lower portion U may overlap with the interior body 200 or may be overlapped with the interior body 200 in the width direction. You may each provide in the width direction both sides except a center part. The waist edge elastic elastic member 17 has a thickness of 155 to 1880 dtex, particularly about 470 to 1240 dtex (in the case of synthetic rubber. In the case of natural rubber, the cross-sectional area is 0.05 to 1.5 mm ² , particularly 0.1 to the rubber thread of 1.0mm about ^2), 3 to 22 present approximately at intervals of 4 to 12 mm, respectively elongation from 150% to 400%, preferably fixed in particular about 220-320%. Further, the waist edge elastic elastic members 17 need not all have the same thickness and elongation rate. For example, the elastic elastic members may have different thicknesses and elongation rates at the upper and lower portions of the waist edge W. .

  In addition, between the inner layer 21 and the outer layer 22 in the waist lower portion U of the front body F and the rear body B, the width is provided at each part on the upper side and both sides in the width direction except for the center portion in the width direction that overlaps the interior body 200. A plurality of waist lower elastic expansion / contraction members 15 made of an elongated elastic expansion / contraction member are fixed so as to be continuous over the entire direction, spaced apart in the vertical direction and extended along the width direction at a predetermined expansion rate. Has been.

The waist lower elastic elastic member 15 has a thickness of 155 to 1880 dtex, particularly about 470 to 1240 dtex (in the case of synthetic rubber. In the case of natural rubber, the cross-sectional area is 0.05 to 1.5 mm ² , particularly 0.1 to 1. It is preferable to fix the thread rubber of about 0 mm ^{2 at} a spacing of 1 to 15 mm, particularly 3 to 8 mm, and an elongation rate of 200 to 350%, particularly about 240 to 300%.

  In addition, between the inner layer 21 and the outer layer 22 in the middle part L of the front body F and the back body B, except for the center part in the width direction that overlaps the interior body 200, the entire width direction is provided at each part on both sides in the width direction. A plurality of intermediate elastic elastic members 16 made of an elongated elastic elastic member are fixed in a state where they are extended in the width direction at a predetermined extension rate with a space in the vertical direction. Yes.

The intermediate elastic elastic member 16 has a thickness of 155 to 1880 dtex, particularly about 470 to 1240 dtex (in the case of synthetic rubber. In the case of natural rubber, the cross-sectional area is 0.05 to 1.5 mm ² , particularly 0.1 to 1. It is preferable to fix the thread rubber of about 0 mm ² ) at intervals of 5 to 40 mm, particularly 5 to 20 mm, and stretch ratios of 150 to 300%, particularly 180 to 260%, respectively.

  As shown in the drawing, the waist lower elastic elastic member 15 and the intermediate elastic elastic member 16 are overlapped with the interior body 200 in the width direction central portion (both the region having the same width as the interior body 200 or a part of the region). If it is respectively provided on both sides in the width direction except for (including), the interior body 200 will not shrink more than necessary in the width direction, and it will not look like Mokomoko or the absorbability will not decrease. In this form, in addition to the form in which the elastic stretchable member exists only on both sides in the width direction, the elastic stretchable member exists from one side of the width direction to the other side across the interior body 200, but overlaps the interior body 200. At the center in the width direction, the elastic expansion / contraction member is finely cut, and the contraction force does not act (substantially equivalent to not providing the elastic expansion / contraction member), and only the both sides in the width direction are configured as the contraction force acting portions. Are also included. Of course, the disposition form of the waist lower elastic elastic member 15 and the intermediate elastic elastic member 16 is not limited to the above example, and the waist lower elastic elastic member 15 and the waist lower elastic elastic member 15 so that the elastic force acts over the entire width direction of the waist lower U. A part or all of the intermediate elastic elastic member 16 may be provided from one side in the width direction to the other side across the interior body 200.

(Exterior split structure)
Moreover, in the above-mentioned example, the front body F to the back body B are continuously covered with the integral exterior body 12, but the abdominal exterior body and the back exterior body are continuously located on the crotch side. In this case, the crotch covering the portion of the outer surface of the interior body that is exposed between the exterior body on the abdominal side and the exterior body on the back side. A part exterior body can be affixed. As the crotch outer casing, the same materials as those used for the outer casing described above can be used. Moreover, in this case, the outer body of the front body and the outer body of the rear body individually include the first sheet material and the second sheet material.

(Post-processing tape)
A post-processing tape 90 can be provided at the center in the width direction on the outer surface of the rear body B of the exterior body 12. The post-processing tape 90 is for fixing the diaper 100 in a state of being rolled or folded so that the topsheet 30 is on the inside and the front body F is on the inside. As shown in FIG. 5, the general post-processing tape 90 has a base end portion 91 of a base material made of a resin sheet fixed to the outer surface of the exterior body 12 with an adhesive or the like, and more than the base end portion 91. The front end portion is folded in three (Z-shaped cross section) or in two, and the portion between the folded portions is fixed by an adhesive 92 so as to be peeled off. Moreover, it has the knob | pick part 93 colored in opaque colors, such as white, in the front-end | tip part, and the part except this knob | pick part 93 is transparent or translucent. Although the specific structure is not particularly limited, the illustrated embodiment employs a structure in which a plurality of transparent or semi-transparent substrates are connected in the longitudinal direction and a colored tape 94 is bonded to the knob 93. ing.

At the time of disposal, the diaper 100 is rolled or folded so that the topsheet 30 is on the inside and the front body F is on the inside, and then the folded portion of the post-treatment tape 90 is peeled off and spread, and the diaper 100 is rolled or folded. The diaper 100 is fixed with an adhesive so as to be wound from the rear body B of the diaper 100 to the outer surface on the opposite side over the waist opening WO. The post-processing tape 90 is particularly preferably a tri-fold shape that can be folded compactly when not in use and can be expanded into a long shape when in use.
The post-processing tape 90 may be provided on the front body F, or may be provided on both the back body B and the front body F.

(About the layer structure of the exterior body)
Characteristically, as shown in FIGS. 5 and 11, the second sheet material 12 </ b> H located on the inner side extends to the end on the waist opening WO side in the front body F, but the back body B In FIG. 3, the second sheet material 12H of the front body F extends only to a position below the front end (front and rear center side). As a result, at the waist edge W of the outer body 12 of the front body F, the three-layer structure consisting of the second sheet material 12H and the first sheet material 12S located on both the inside and outside of the waist opening WO side. In the waist edge W of the outer body 12 of the back body B, the second sheet material extends only to a position below that of the front body F, so that the second The waist opening WO side from the rear end of the sheet material 12H is an area having a two-layer structure formed by folding the first sheet material 12S. Therefore, the waist edge W of the exterior body 12 of the back body B is secured while making the waist edge W of the exterior body 12 of the front body F relatively rigid so as to ensure fit suitable for the bulging of the abdomen of the wearer. Thus, it is possible to secure a fitting property suitable for a portion between the wearer's back and the bulge of the buttocks (a portion that is flat, changes little with time, and has relatively little meat). That is, the fitting property of the whole circumferential direction of the waist edge W can be improved. Moreover, it can also avoid that the air permeability of the waist edge part W of the exterior body 12 of the back body B falls.

  As long as the front end of the second sheet material 12H in the front body F is located at the end of the waist edge W on the side of the waist opening WO, as shown in FIG. 11, the front end is slightly spaced downward from the edge of the waist opening WO. Alternatively, as shown in FIG. 13, it can be positioned at the edge of the waist opening WO (mostly not separated). When the front end of the second sheet material 12H in the front body F is separated downward from the edge of the waist opening WO as shown in FIG. 11, the separation distance 17s is about 0.5 to 3.0 mm. It is preferable. Moreover, as FIG. 13 shows, the 2nd sheet material located in the waist edge part of the front body F can also be provided separately from the 2nd sheet material of another site | part. In this case, as the second sheet material positioned at the waist edge of the front body F, a material having higher rigidity than the second sheet material of other parts can be used. As can be seen from this example, the second sheet material may be divided into a plurality of sheet materials.

  As long as the rear end of the second sheet material 12H in the rear body B is positioned below (front and rear center side) than the front end of the second sheet material 12H in the front body F, it is positioned in the lower waist portion U as shown in FIG. Besides, it can be positioned at the boundary between the waist edge W and the waist lower part U, or can be positioned in the middle in the longitudinal direction of the waist edge W. In particular, when the back body B has the post-processing tape 90 as in the present embodiment, if the corners and edges of the post-processing tape 90 are arranged in the thin part of the exterior body 12 of the back body B, the skin of the wearer 11, the second sheet material 12H of the exterior body 12 of the back body B is placed on the waist opening WO side of the post-processing tape 90 as shown in FIG. It is also a preferable form to extend up to. Further, as shown in FIG. 11, when the rear end of the second sheet material 12H in the exterior body 12 of the back body B is positioned below the lowermost waist edge elastic elastic member 17, the back body B The entire waist edge W of the exterior body 12 is relatively low in rigidity, and fits to a portion between the wearer's back and the bulge of the buttocks (a flat portion with little change with time and relatively little meat). Furthermore, it can be made more excellent.

  As shown in FIG. 5, the lower end of the folded portion 12r of the first sheet material 12S is preferably extended to the end of the interior body 200 on the waist opening WO side to cover the end of the interior body 200. However, as long as the layer structure of the present invention can be formed, the inner opening 200 can be positioned on the waist opening WO side. For example, the front body F only needs to extend to the lower end of the waist edge W, and the rear body B only needs to extend to the rear end position of the second sheet material 12H.

  The folded portion 12r formed by folding the first sheet material 12S inside the second sheet material 12H at the waist edge W of the outer body 12 of the front body F is the second sheet material when importance is attached to flexibility. In order to improve the rigidity of the waist edge W of the outer body 12 of the front body F, it is preferable to be joined to the inner surface of 12H by an adhesive 12m applied in an intermittent pattern (spiral application or the like). It is also a preferred form that the adhesive 12m is applied in a continuous pattern by curtain coating or solid coating.

  As long as the waist edge elastic elastic member 17 is sandwiched between the inner layer 21 and the outer layer 22 formed by at least one of the first sheet material 12S and the second sheet material 12H, as shown in FIG. Even if it is sandwiched between the same layers as the elastic elastic member 15 and the intermediate elastic member 16 or between different layers as shown in FIG. 13 (waist lower elastic elastic member 15 and intermediate elastic elastic member) The member 16 is sandwiched between the outer surface forming portion of the first sheet material 12S and the second sheet material 12H, and the waist edge elastic elastic member 17 is formed between the inner surface of the second sheet material 12H and the folded portion 12r of the first sheet material 12S. Good)

The material of the first sheet material 12S and the second sheet material 12H is not particularly limited, but at least one of them is a nonwoven fabric of polypropylene (PP) or a copolymer thereof (for example, polyethylene or a copolymer in which ethylene is blended as a copolymerization component) (hereinafter, It is preferably a flexible nonwoven fabric such as a nonwoven fabric of core-sheath fiber (PE / PP) having polyethylene (PE) as a sheath and polypropylene (PP) as a core component. If a flexible nonwoven fabric is used for the first sheet material 12S and the second sheet material 12H, the waist edge W of the outer body 12 of the front body F tends to be insufficient in rigidity because of the flexibility, and before and after the rigidity of the waist edge W Balance is easily lost. Therefore, the present invention is particularly preferably applied to the exterior body 12 using such a flexible nonwoven fabric. In the case of using a nonwoven fabric, the production method is not particularly limited, but a spunbond nonwoven fabric is preferable from the viewpoint of excellent strength and flexibility, and in particular, a spunbond nonwoven fabric formed by laminating a plurality of spunbond layers, for example, SS nonwoven fabric (two layers). Alternatively, an SSS nonwoven fabric (three layers) can be suitably used, and four or more layers can also be used. When the first sheet material 12S and the second sheet material 12H are nonwoven fabrics, it is desirable that the thickness is 0.1 to 1 mm and the basis weight is 10 to ²⁰ g / m ² , respectively.

(About stretchable structure)
The structure for joining the first sheet material 12S and the second sheet material 12H and fixing the elastic elastic member 19 is not particularly limited. For example, the adhesive 71 is applied to the peripheral surface of the elastic elastic member 19 to form the first sheet material. A known structure such as sandwiching between 12S and the second sheet material 12H can also be adopted, but in the present embodiment, a telescopic structure described below is adopted. That is, in the pants-type disposable diaper of this embodiment, in the region from the waist edge W to the intermediate portion L, as shown in FIG. 6, the inner layer 21 formed by the first sheet material 12S and the second sheet material 12H and The outer layer 22 is intermittently arranged in the width direction, and joined by an adhesive 71 (hot melt adhesive 71 or the like) continuous in a predetermined width in a direction intersecting with the width direction (orthogonal in the illustrated embodiment), A sheet joining portion 70 is formed. The width direction dimension 70w of each sheet bonding portion 70 is preferably 0.5 to 4 mm, and the interval 70d between adjacent sheet bonding portions 70 is preferably 4 to 8 mm (preferably 5 to 7 mm). . The lower limit of the dimension 70w in the width direction of the sheet joining portion 70 is preferably 1 mm from the viewpoint of manufacturability, but is preferably 0.5 mm from the viewpoint of flexibility. On the other hand, the upper limit of the dimension 70w in the width direction of the sheet joining portion 70 is preferably 2 mm, and more preferably 1.5 mm.

  The elastic elastic members 15 to 17 are fixed to at least one of the inner layer 21 and the outer layer 22 by an adhesive 71 at a position intersecting with the sheet joining portion 70. In order to fix the elastic elastic members 15 to 17, an adhesive different from that for forming the sheet bonding portion can be applied to the elastic elastic members or the inner layer 21 and the outer layer 22. Since the adhesive 71 for forming the belt is continuous in the direction crossing the width direction, the elastic elastic members 15 to 17 are fixed to at least one of the inner layer 21 and the outer layer 22 by using the adhesive 71. ing. In manufacturing, the adhesive 71 is applied to one or both of the inner layer 21 and the outer layer 22, and the elastic elastic members 15 to 17 are bonded to the inner layer 21 and the outer layer 22 when the inner layer 21 and the outer layer 22 are joined. You just put between.

  In the form shown in FIG. 6, the adhesive 71 is applied to the inner surface of the outer layer 22 intermittently in the width direction and continuously with a predetermined width in the direction intersecting the width direction. On the outer surface, the elastic elastic members 15 to 17 are sandwiched between the inner layer 21 and the outer layer 22 without applying the adhesive 71, and the inner layer 21, the outer layer 22, and the elastic elastic member 15 are sandwiched between them. ˜17 are joined by an adhesive 71, respectively. In this case, among the portions where the sheet joining portion 70 and the elastic elastic members 15 to 17 intersect, the elastic elastic member 15 is formed by the adhesive 71 continuing in the direction intersecting the width direction outside the elastic elastic members 15 to 17. -17 are fixed to the outer layer 22, and the adhesive 71 is discontinuous in the direction intersecting the width direction inside the elastic elastic members 15-17. In the figure, this discontinuous portion is indicated by reference numeral 72. Since the adhesive 71 is intermittently present in the inner layer 21, a decrease in flexibility of the inner layer 21, and thus a decrease in flexibility of the exterior body 12 as a whole can be suppressed. Further, the elastic elastic members 15 to 17 are continuous with the adhesive 71 only on the outer side at the portion intersecting with the sheet bonding portion 70, but the longitudinal layers of the elastic elastic members 15 to 17 are formed on the inner layer 21 and the outer side by the sheet bonding portion 70. Since the layer 22 is integrated, the contraction force of the elastic elastic members 15 to 17 acts on the inner layer 21 and the outer layer 22 in substantially the same manner, thereby forming uniform wrinkles on both the inner layer 21 and the outer layer 22. Can do.

  It is also possible to apply the adhesive 71 in the same pattern to both the inner layer 21 and the outer layer 22. In this case, as shown in FIG. 12, the adhesive 71 crosses the width direction both inside and outside the elastic elastic members 15 to 17 in the portion where the sheet joining portion 70 and the elastic elastic members 15 to 17 intersect. Since the elastic stretchable members 15 to 17 are more firmly fixed, there is an advantage that the elastic stretchable members 15 to 17 are continuously fixed in a predetermined direction. Further, although not shown, it is also possible to apply the adhesive 71 to the inner layer 21 and fix the elastic layer by sandwiching an elastic member without applying the adhesive 71 to the outer layer 22. However, in these forms, since the adhesive 71 is continuous in the inner layer 21, not only the flexibility of the second sheet material 12 </ b> H itself to be brought into contact with the skin but also the portion where the flexibility is reduced is the elastic elastic members 15 to 15. 17 is not preferable in that respect because it is pressed against the skin.

  A hot melt adhesive 71 is preferably used as the adhesive 71 for forming the sheet bonding portion 70. Examples of the hot melt adhesive 71 include EVA, adhesive rubber (elastomer), olefin, polyester / polyamide, and the like. It is desirable to use

  The application method of the hot melt adhesive 71 is not particularly limited, but when the sheet bonding portion 70 has a small width direction dimension, for example, 1 mm or less, the application width of the hot melt adhesive becomes narrow, Since it is difficult to apply by intermittent application by an application method such as a solid spraying from a nozzle, it is desirable to employ a pattern coat suitable for narrow width application (transfer of hot melt adhesive 71 by a relief printing method). FIG. 19 shows an example of a production facility for a stretchable structure when a pattern coat of hot melt adhesive is used. That is, in this pattern coat type equipment example, elastic elastic members 15 to 17 are provided between the second sheet material 12H and the first sheet material 12S in which the hot melt adhesive 71 is applied to the surface on the second sheet material 12H side. 6 is fed between a pair of nip rolls 101 and pressed to form the stretchable structure shown in FIG. Before the first sheet material 12S is fed to the nip roll 101, the first sheet material 12S is brought into contact with the plate roll 102 having an intermittent convex pattern in the circumferential direction, and intermittently in the transport direction (MD direction, which is the width direction). In addition, the hot melt adhesive 71 is transferred and applied continuously in a direction (CD direction) intersecting the transport direction. Reference numeral 103 denotes a hot melt adhesive supply roll (anilox roll in letterpress printing) for transferring and applying the hot melt adhesive 71 to the convex pattern of the plate roll 102 at a predetermined thickness, and reference numeral 104 denotes hot melt adhesion. The supply nozzle which supplies the hot-melt-adhesive 71 to the agent supply roll 103 is shown.

  However, even when such a coating method using a pattern coat is adopted, depending on the type of the hot melt adhesive 71, the hot melt adhesive 71 may be stringed, and the application width (that is, the width of the sheet bonding portion 70). ) May decrease in accuracy and operational stability. Therefore, it is desirable to use a hot melt adhesive 71 having a melt viscosity at a temperature of 140 ° C. of 10,000 mpa or less, a melt viscosity at a temperature of 160 ° C. of 5000 mpas or less, and a loop tack adhesive strength of 2000 g / 25 mm or more. Thereby, the possibility of stringing is reduced, and the application width accuracy and operational stability can be improved.

The loop tack adhesive strength of the hot melt adhesive 71 means a value measured as follows. That is, the hot melt adhesive is applied to a thickness of 50 μm on a PET plate having a thickness of 50 μm. This is cut into a size of 25 mm in width and 125 mm in length to form a tape, and then the two ends of the tape are overlapped to form a loop. This loop is fixed to an LT-100 type loop tack tester (manufactured by Chem Instrument Co., Ltd.), and then bonded to a PE (polyethylene) plate with a bonding area of 25 mm × 25 mm and a bonding time of 2 seconds. Next, the loop-shaped tape is peeled off at 20 ° C. at a peeling speed of 300 mm / min, and the maximum force is measured to obtain the loop tack adhesive force.
The melt viscosity of the hot melt adhesive 71 is measured at a specified temperature using a Brookfield B-type viscometer (spindle No. 027) in accordance with JIS Z 8803.

  Moreover, as shown in FIG. 14, the sheet | seat junction part 70 can also be formed by a welding process. The welded portion is indicated by reference numeral 75. As the welding process, a known processing method such as heat sealing or ultrasonic welding can be employed. Here, the welding process for forming the sheet bonding portion 70 is continuous. As long as the welding traces of at least one of the inner layer 21 and the outer layer 22 are continuous, the inner layer 21, the outer layer 22, and the elastic elastic member 15. To 17 and the inner layer 21 and the outer layer 22 are indirectly welded to form a continuous welding, but also at a portion 72 where the sheet joining portion 70 and the elastic elastic members 15 to 17 intersect. A mode in which welding between the inner layer 21 and the outer layer 22 does not continue because the elastic elastic members 15 to 17 are included is also included. For example, in a state where the elastic elastic members 15 to 17 are sandwiched between the inner layer 21 and the outer layer 22, welding is performed in a continuous pattern across the elastic elastic members 15 to 17 by heat sealing or ultrasonic welding, and the elastic elastic members If the inner layer 21 and the outer layer 22 are melted without melting 15 to 17, the inner layer 21 and the outer layer 22 and the elastic elastic members 15 to 17 are not welded, resulting in the latter form.

  The elastic elastic members 15 to 17 are fixed to at least one of the inner layer 21 and the outer layer 22 at a position intersecting with the sheet bonding portion 70. In this fixed form, the elastic elastic members 15 to 17 and the sheet are bonded to each other at the position where the elastic elastic members 15 to 17 and the sheet joint portion 70 intersect (only bonding by the adhesive 71 such as the hot melt adhesive 71). In addition to the form of welding, the elastic elastic members 15 to 17 and the sheet are not bonded to each other, but the interval between the sheet joint portions 70 in the direction intersecting the width direction is the elastic elastic member 15. The elastic expansion members 15 to 17 are fixed by being sandwiched between the sheet joint portions 70 and are narrower than the thickness at the natural length of ˜17, so that the contraction force of the elastic stretch members 15 to 17 is A form (see Japanese Patent Application Laid-Open No. 2008-154998 and Japanese Patent Application Laid-Open No. 2009-106667) transmitted to the sheet at the intersecting position is also included. More specifically, in the latter form, as shown in FIG. 15 (a), the elastic elastic member 19 extended to a higher elongation rate than that at the time of fixation is sandwiched between the inner layer 21 and the outer layer 22. Then, the sheet bonding portion 70 is welded in a continuous pattern across the elastic elastic member 19 by heat sealing or ultrasonic welding, and the inner layer 21 and the outer layer 22 are melted without melting the elastic elastic member 19, Without welding the layer 21 and the outer layer 22 and the elastic elastic member 19, the tension of the elastic elastic member 19 is then released and the elastic elastic member 19 is contracted as shown in FIG. It can be manufactured by enlarging and sandwiching the elastic elastic member 19 between the sheet joining portions 70. As a result, the manufactured stretchable structure is elastically stretchable at the portion where the sheet joining portion 70 and the elastic stretchable member 19 intersect, although the welding traces of at least one of the first sheet material 12S and the second sheet material 12H are continuous. Since the member 19 is interposed, the welding between the inner layer 21 and the outer layer 22 is not continuous, and the elastic elastic member 19 is fixed by being sandwiched between the sheet joining portions 70.

  If the sheet joint portion 70 is formed by welding, the welded portion 75 cannot be hardened. However, if the size of the sheet joint portion 70 is within the above range, the influence of the hardening is small. Further, as a secondary effect, the transparency of the welded portion 75 is increased, and an appearance in which the glossy welded portion 75 forms a stripe pattern is obtained.

  The distance 19d between the elastic elastic members 19 adjacent to each other can be determined as appropriate. However, if the distance exceeds 10 mm, the thickness of the flange 80 changes in the direction intersecting the width direction, although it is not as long as the longitudinal intermittent joining form. Therefore, in this invention, it is preferable that the space | interval 19d of the elastic elastic member 19 which adjoins is 10 mm or less, especially 3-7 mm.

  The thickness and elongation rate of the elastic elastic member 19 (elongation rate when the elastic structure is fully deployed) may be appropriately selected according to the mounting position of the elastic elastic member 19, and the preferred range is as described above. is there. In general, it is desirable that the elastic elastic member 19 has a thickness of about 300 to 1,000 dtex and an elongation rate of about 200 to 350%.

  In the expansion / contraction structure described above, as the elastic expansion / contraction members 15 to 17 contract, the portions located between the sheet joining portions 70 in the inner layer 21 and the outer layer 22 contract as shown in FIG. The ridges 80 swell in opposite directions to form a ridge 80. FIG. 6B shows a natural length state, but when mounted, the elastic elastic members 15 to 17 are extended from this state to a certain extent, and as shown in FIG. The height 80h of the ridge 80 is lowered. In addition, since this stretchable structure is in the form of continuous joining in the vertical direction, a flange 80 that extends straight along the sheet joining portion 70 is formed, and is excellent in air permeability and appearance.

  The dimension 70w in the width direction of each sheet joint portion 70 affects the interval between the adjacent ridges 80. When the ridge 80 to be formed is thin like the longitudinal continuous joining form, the width 70w is 4 mm. If it exceeds, the space between the adjacent ridges 80 becomes too wide, and not only the individual ridges 80 look independent, but also when the ridges 80 are crushed by the compressive force in the thickness direction or deformed such as falling down, they are adjacent. As a result of weakening the function of supporting the heel 80, the resistance to deformation or the restoration after the change becomes weak, and as a result, the feeling of fun is insufficient.

  In addition, when the dimension 70w in the width direction of the sheet joining portion 70 is simply set to 0.5 to 4 mm, and the interval 70d between the adjacent sheet joining portions 70 is less than 4 mm or more than 8 mm, the following results. That is, the interval 70d between the adjacent sheet bonding portions 70 affects the height 80h and the width of the flange 80, and when the interval 70d between the adjacent sheet bonding portions 70 is about 2 mm, It becomes the same ridge 80 having poor continuity in the longitudinal direction (the meaning of providing the sheet joint portion 70 intermittently in the width direction is lost), but at 3 mm, the ridge 80 extends straight in a direction orthogonal to the width direction. The effect that the adjacent ridges 80 support each other cannot be expected, and the sense of fun is insufficient. Moreover, if the space | interval 70d of the sheet | seat junction part 70 exceeds 8 mm, the collar 80 will be crushed irregularly by compression at the time of packaging, and the appearance of a product will worsen. On the other hand, when the dimension 70w in the width direction of the sheet bonding portion 70 is set to 0.5 to 4 mm and the interval 70d of the sheet bonding portion 70 is set to 4 to 8 mm, a sufficient feeling of warmth is obtained. The bag 80 is not easily crushed irregularly due to compression during packaging. Therefore, even if a particularly flexible nonwoven fabric is used for at least one of the first sheet material and the second sheet material, the ridge 80 is difficult to be thinned, hardly collapsed, and rich in compression and restoration properties.

  The inner layer 21 and the outer layer 22 are preferably non-woven fabrics. In this case, if the bending resistance in the width direction is low, the wrinkles 80 become thin and sharp and easy to collapse, and the compression in the thickness direction is restored. Sexuality also becomes poor. In order to improve this, it is conceivable to increase the basis weight of the non-woven fabric, but there is a possibility that the softness when touched may be poor even if the appearance is stiff (because the rigidity is improved too much). Therefore, it is also proposed to use a nonwoven fabric as the inner layer 21 and the outer layer 22 so that the bending resistance in the width direction is higher than the bending resistance in the direction perpendicular to the width direction. As a result, the heel 80 becomes round and easy to bulge, and the compression recovery property in the thickness direction is enhanced, and the heel 80 is less likely to fall down and soft when touched. Each of the inner layer 21 and the outer layer 22 has a bending resistance in the width direction of preferably 30 to 75 mm, more preferably 40 to 55 mm, and the bending resistance in the direction orthogonal to the width direction is less than the bending resistance in the width direction. In the range, it is preferably 20 to 50 mm, more preferably 25 to 35 mm.

  Here, the bending resistance of the nonwoven fabric means a value measured according to the bending resistance A method (45-degree cantilever method) of JIS L1096: 2010 “Testing method for fabrics and knitted fabrics”.

  In order to make the bending resistance in the direction orthogonal to the width direction of the nonwoven fabric less than the bending resistance in the width direction, the fiber orientation of the nonwoven fabric may be configured along the width direction. Here, the fiber orientation is the direction along which the fibers of the nonwoven fabric are along, and “the fiber orientation is along the width direction” means that 100% of the total fiber weight constituting the nonwoven fabric is fiber-oriented in the width direction. The thing from what is made to have a fiber orientation in the range of -45 degrees-+45 degrees with respect to the width direction from 50% or more. The measurement method generally used can be used for the measuring method of the fiber orientation of a nonwoven fabric. Examples of measurement methods include a measurement method according to the TAPPI standard method T481 fiber orientation test method using zero-range tensile strength, and a simple measurement that determines the fiber orientation direction from the tensile strength ratio in the width direction and its orthogonal direction. A method can be mentioned. In the latter simple measuring method, a test piece having a length of 200 mm and a width of 50 mm is subjected to a tensile test using a tensile tester under the conditions of a crosshead speed of 500 mm / min and a distance between chucks of 150 mm. If the tensile strength is obtained from the maximum load and the ratio of tensile strength (width direction / orthogonal direction) is greater than 1, the fiber orientation is assumed to be along the width direction.

  In the present stretchable structure, since the sheet joint portion 70 is intermittent in the width direction, a decrease in the fixing force of the elastic stretchable members 15 to 17 cannot be avoided, and the elastic stretchable members 15 to 17 may come off. In particular, it is desirable that the dimension 70w in the width direction of each sheet joint portion 70 is narrow. It is necessary to fix 15-17, and securing of the fixing force of the elastic elastic members 15-17 becomes important.

  To solve this, as shown in FIG. 9, regions on both sides in the width direction of the interior body 200 in the exterior body 12 are defined as an end region on the interior body 200 side, an end region on the side seal portion 12A side, When divided into intermediate regions located between them, the distances Di and Ds between the sheet bonding portions 70 in the end region on the inner body 200 side and the end region on the side seal portion 12A side are set between the sheet bonding portions 70 in the intermediate region. It is desirable to make it narrower than the distance Dm.

  Further, instead of the configuration shown in FIG. 9 (which may be combined with the configuration shown in FIG. 9), as shown in FIG. 10, the elasticity in the end region on the inner body 200 side and the end region on the side seal portion 12A side is shown. In one preferred form, the fixed widths Wi and Ws of the elastic members 15 to 17 (equal to the dimension 70w in the width direction of the sheet joining portion 70 in the illustrated embodiment) are wider than the fixed width Wm of the elastic elastic member in the intermediate region. is there.

  In addition, since the elastic expansion members 15 to 17 of the exterior body 12 of the pants-type disposable diaper are firmly fixed at the side seal portion 12A at the outer ends in the width direction, these end regions on the side seal portion 12A side are It is also a preferable form that the fixing strengthening means is omitted.

  In the illustrated example, not only the waist edge W of the pants-type disposable diaper, but also a similar elastic structure is formed up to the waist lower part U and the middle part L. However, the waist edge W, the waist lower part U, and the middle part Another known elastic structure may be applied to a part of L, and the elastic elastic member 16 of the intermediate part L may be omitted. Further, in the illustrated example, the sheet joining portion 70 in each body including the waist edge W is continued in the vertical direction, but the sheet joining portion 70 of the waist edge W and the sheet joining portion 70 of the lower waist U are individually and It can also be formed with a space between each other.

<Non-bonded / Non-elastic elastic member area>
As shown in FIG. 13, the waist edge portion W may be disposed with the waist edge elastic elastic member 17 up to the edge on the waist opening WO side, and may form the sheet joint portion 70. As described above, the rigid sheet joining portion 70 will continue in the vertical direction to the edge of the waist opening WO, and the dense shrinkage folds will continue firmly and vertically in the edge of the waist opening WO. By forming the wavy unevenness having high rigidity, the wearing feeling of the waist edge W may be deteriorated.
Therefore, as shown in FIGS. 5 and 6 and FIGS. 11 to 14, the sheet joint portion 70 and the waist edge elastic elastic member are provided at the waist opening WO side end of the waist edge W of the exterior body 12. 17, and the longitudinal range is wider than the interval 17 d between the waist edge elastic elastic member 17 positioned closest to the waist opening WO and the waist edge elastic elastic member 17 adjacent thereto, It is also a preferable form to provide the inelastic elastic member region 25. In the illustrated embodiment, both the front body F and the back body B are provided with the non-joining / inelastic elastic member region 25, but only one of them may be used.

  As described above, when the non-joint / non-elastic stretchable member region 25 is secured widely in the waist edge W while adopting the longitudinal continuous joining form in the waist edge W, FIG. 16 (a) and FIG. 17 (a). As can be seen from the photograph of the partial sample of the waist edge W shown, the end portion (non-bonding / non-elastic elastic member region 25) on the waist opening WO side has no hard sheet bonding portion 70 and the waist edge. The shrinkage wrinkles are larger and sparser and more flexible than the region having the elastic elastic members 17, and the unevenness of the edge WOE of the waist opening WO is also largely sparse and flexible, and the feeling of wearing the waist edge W is good. . And since the waist edge W of the exterior body 12 becomes a vertical direction continuous joining form except the edge part by the side of the waist opening WO, it is formed in the waist edge W by shrinkage | contraction of the waist edge elastic elastic member 17. FIG. Since the shrinkage wrinkles are formed to be largely sparse at the end on the waist opening WO side, the air permeability in the vertical direction due to the shrinkage wrinkles is hardly impaired. On the other hand, when the vertical continuous joining form is adopted in the conventional pants-type disposable diaper, as can be seen from the photographs of the partial samples of the waist edge W shown in FIGS. 16 (b) and 17 (b), Since there is almost no non-bonded / inelastic elastic member region 25 at the end of the waist edge W on the side of the waist opening WO, the rigid sheet joint 70 continues in the vertical direction to the edge of the waist opening WO. As a result, and the dense shrinkage wrinkles are continuously firmly formed in the vertical direction, and the wavy unevenness having high rigidity is formed on the edge WOE of the waist opening WO, the wearing feeling of the waist edge W is deteriorated.

  The longitudinal dimension of the non-bonded / inelastic elastic member region 25 may be determined as appropriate, but as shown in FIGS. 6A, 12A and 14A, the edge of the waist opening WO The distance 26 from the WOE to the tip of the sheet joint portion 70 on the waist opening WO side is preferably 3 to 15 mm. Moreover, it is preferable that the distance 27 from the edge of the waist opening WO to the waist edge elastic elastic member 17 located closest to the waist opening WO is 5 to 20 mm. The distance 26 from the edge WOE of the waist opening WO to the tip of the seat opening 70 on the side of the waist opening WO is the most from the edge of the waist opening WO because the elastic elastic member at the waist edge is fixed at the sheet joint. It becomes shorter than the distance 27 to the waist edge elastic elastic member 17 located in the waist opening WO side. The distance 26 from the edge of the waist opening WO to the tip of the sheet joint 70 on the side of the waist opening WO is less than 3 mm, or the elasticity of the waist edge located closest to the waist opening WO from the edge of the waist opening WO If the distance 27 to the elastic member 17 is less than 5 mm, the rigidity of the wavy irregularities formed at the edge of the waist opening WO tends to increase. Further, when the distance 26 from the edge of the waist opening WO to the front end of the seat joint 70 on the side of the waist opening WO exceeds 15 mm, there is no change in the effect of improving the wearing feeling of the waist edge W. This is not preferable because wrinkles formed in the inelastic elastic member region 25 tend to be irregular. Further, if the distance 27 from the edge of the waist opening WO to the waist edge elastic elastic member 17 located closest to the waist opening WO exceeds 20 mm, the fit of the waist edge W is not preferable.

<Experiment 1>
Fineness 1.6 denier, basis weight 17 g / m ² , thickness 0.2 mm (initial thickness T0: thickness under pressure of 0.5 g / cm ² ), MD softness (direction of nonwoven fabric production line) 55 mm, A polypropylene fiber SSS nonwoven fabric having a bending resistance of 28 mm in the CD direction (direction perpendicular to the MD direction) is cut to prepare a first sheet material and a second sheet material having a length of 180 mm in the MD direction and a length of 40 mm in the CD direction. did. Moreover, a 470 dtex rubber thread was prepared as an elastic elastic member.
Then, a hot melt adhesive having a width of 1 mm and continuous in the CD direction is applied to the surface of the first sheet material on the second sheet material side with an interval of 7 mm in the MD direction, and further, continuous in the MD direction. 7 pieces of rubber thread are arranged in the CD direction at intervals of 5 mm, 270% of each stretched state, and the second sheet material is placed over the first sheet material so that the MD direction and the CD direction match the first sheet material. The material, the elastic elastic member and the second sheet material are pressure-bonded, and the elastic sheet sample No. 1 was produced. In addition, this sample No. The natural length of 1 in the MD direction was 67 mm. Further, the application width of the hot melt adhesive was appropriately changed to 2 mm, 4 mm, 6 mm, and 10 mm, and the application interval of the hot melt adhesive was appropriately changed to 2 mm, 4 mm, 6 mm, 8 mm, and 10 mm. 2 to 13 were also produced.
Observe the formation of wrinkles in these samples, ◎: The walls are very clean,
○: Evaluation was made in four stages: 襞 was formed beautifully, △: 襞 was formed but not beautiful, ×: 襞 was insufficiently formed. The evaluation results are as shown in Table 1. In addition, although the wrinkle was formed when the application | coating space | interval of a hot-melt-adhesive was 10 mm, it was too large and it was crushed at the time of compression, and the wrinkle was not formed in 2 mm. Further, when the application width of the hot melt adhesive was 6 mm and 10 mm, the sheet joint portion was also contracted to form wrinkles.

  From this result, the application width of the hot melt adhesive (that is, the dimension in the width direction of the sheet bonding portion) is 0.5 to 4 mm, and the application interval of the hot melt adhesive (that is, the interval between adjacent sheet bonding portions). It can be seen that a desirable result is obtained when the thickness is 4 to 8 mm.

<Experiment 2>
In the same manner as in Experiment 1 (however, the application width of the hot melt adhesive was 2 mm, the application interval was 6 mm), the sample No. of the stretchable sheet was changed. 14 was produced.
Sample No. 1 except that the continuous direction of the hot melt adhesive was the MD direction of the first sheet material and the second sheet material, and the direction of the thread rubber was the CD direction of the first sheet material and the second sheet material. In the same manner as in sample No. 14, sample no. 15 was created.
These sample Nos. 14 and no. 15 is a natural length, and the center of the pressure plate described later is aligned with the top position of the heel for five ridges, and compression characteristics (compression rigidity LC, compression energy WC, compression resilience RC, initial thickness T0, maximum load Thickness TM) was measured and the average value was calculated. The compression stiffness LC is closer to 1, meaning that the compression stiffness is greater. The larger the compression energy WC is, the easier the compression is. The compression resilience RC is closer to 100, and the compression recovery is better. Means. The initial thickness T0, compression stiffness LC, compression energy WC, and compression resilience RC are measured using a KES-FB3-AUTO-A automated compression tester based on KES (Kawabata's Evaluation System for Fabrics). Measurements between steel pressure plate with a circular plane of compression area 2 cm ^2, the sample was compressed from 0 gf / cm ² to a maximum compressive load 50 gf / cm ^2, carried out between undo. The initial thickness T0 is the thickness of the sample at a pressure of 0.5 gf / cm ² . The compression stiffness LC represents the linearity of the compression displacement, and the value increases as the load and the displacement (thickness reduction due to compression) are proportional. The compression energy WC represents the work of compression, and the larger the value, the better the feeling of swelling and the feeling of lower back. The compression resilience RC represents compression recovery, and the larger the numerical value, the smaller the hysteresis.

  In addition, these sample Nos. 14 and no. 15 is stretched about 1.65 times in the MD direction (assuming a diaper wearing state), and a microscopic image is taken from the side (magnification 30 times). The width 80X was measured for each ridge 80, and the average value was calculated. The photograph taken is shown in FIG. 14 and the height and width of the ridge are shown in Table 3. A KEYENCE digital microscope VHX-1000 was used for microscopic photography.

  From these results, when the stiffness in the width direction of the nonwoven fabric is made higher than the stiffness in the direction perpendicular to the width direction, the wrinkles become round and easy to swell, and the compressive recoverability in the thickness direction becomes rich, and the wrinkles collapse. It turns out that it becomes harder and softer when touched.

<Experiment 3>
Prepare the same first sheet material, elastic elastic member and second sheet material as in Experiment 1, and various hot melt adhesives with different melt viscosities and loop tack adhesive forces, and use the same equipment as shown in FIG. Adhesion test is performed at a speed of 187 m / min, and operational stability such as stringing of hot melt adhesive is achieved.
○: There was no stringing and stable adhesion was possible.
×: There is stringing, the accuracy of the coating width is low, and there is a problem in terms of operational stability.
It was evaluated in two stages.

  From this result, when a hot melt adhesive having a melt viscosity at a temperature of 140 ° C. of 10,000 mpas or less, a melt viscosity at a temperature of 160 ° C. of 5000 mpas or less, and a loop tack adhesive strength of 2000 g / 25 mm or more is used, a desirable result is obtained. You can see that

<Explanation of terms in the specification>
The following terms in the specification have the following meanings unless otherwise specified in the specification.
(Gel strength)
The gel strength is measured as follows. 49.0 g of artificial urine (urea: 20 wt%, salt: 8 wt%, calcium chloride dihydrate: 0.3 wt%, magnesium oxide heptahydrate: 0.8 wt%, pure water: 70.01 wt%), Add 1.0 g of superabsorbent polymer and stir with a stirrer. The produced gel is left in a constant temperature and humidity chamber of 40 ° C. × 60% RH for 3 hours and then returned to room temperature, and the gel strength is measured with a card meter (Curdmeter-MAX ME-500, manufactured by I.techno Engineering).

(Weight)
The basis 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 20 ± 5 ° C., relative humidity 65% or less) to obtain a constant weight. Pre-drying refers to making a sample or test piece constant in an environment where the relative humidity is 10 to 25% and the temperature does not exceed 50 ° C. In addition, it is not necessary to perform preliminary drying about the fiber whose official moisture content is 0.0%. A sample with a size of 200 mm × 250 mm (± 2 mm) is cut out from the test piece in a constant weight using a rice-basis plate (200 mm × 250 mm, ± 2 mm). Measure the weight of the sample, multiply it by 20, calculate the weight per square meter, and use it as the basis weight.

(Thickness)
The thickness is automatically measured using an automatic thickness meter (KES-G5 handy compression measurement program) under the conditions of load: 10 gf / cm ² and pressure area: 2 cm ² .

  The present invention can be applied to general pants-type disposable diapers.

  DESCRIPTION OF SYMBOLS 11 ... Liquid impervious sheet, 12 ... Exterior body, 12A ... Side seal part, 12H ... 2nd sheet material, 12S ... 1st sheet material, 12r ... Folded part, 200 ... Interior body, 30 ... Top sheet, 40 ... Intermediate sheet, 50 ... absorbent element, 56 ... absorbent, 58 ... packaging sheet, 60 ... solid gather, 62 ... gather sheet, 70 ... sheet joint, 71 ... adhesive, 80 ... ridge, 21 ... inner layer, 22 ... Outer layer, F ... front body, B ... back body, WO ... waist opening, LO ... leg opening, T ... waistline, U ... waist lower part, W ... waist edge, L ... middle part, 17 ... waist Edge elastic elastic member, 15 ... waist lower elastic elastic member, 16 ... middle elastic elastic member, 25 ... non-joining / non-elastic elastic member region, 90 ... post-processing tape.

Claims (13)

An exterior body constituting the front body and the back body, and an interior body including an absorbent body fixed to the inner surface of the exterior body,
A side seal portion is formed by joining both sides of the outer body of the front body and both sides of the outer body of the rear body, so that the waist portion is formed in an annular shape, and the waist opening and the pair of left and right Leg openings are formed,
At least the waist edge portion of the exterior body is provided with a first sheet material forming the outer surface of the diaper, a second sheet material facing the inner surface of the first sheet material, and spaced apart from each other along the width direction. In a pants-type disposable diaper comprising a plurality of elongated waist edge elastic elastic members,
At the waist edge of the exterior body in the front body, the second sheet material extends to the end on the waist opening side, and the first sheet material is inside the second sheet material at the edge of the waist opening. The waist edge elastic elastic member is sandwiched between the first sheet material and the second sheet material on either the inside or outside of the second sheet material,
At the waist edge of the exterior body in the rear body, the second sheet material extends only to a position below the front end of the second sheet material in the front body, and the first sheet material is the waist. Folded at the edge of the opening, and at least part of the waist edge elastic elastic member is sandwiched between the first sheet material on the waist opening side of the second sheet material,
A pants-type disposable diaper characterized by that.   At the waist edge of the outer body of the front body, the folded portion of the first sheet material that is folded inside the second sheet material is formed of the second sheet material by an adhesive applied in a continuous pattern. The pants-type disposable diaper according to claim 1, which is adhered to an outer surface.   The outer surface of the exterior body of the back body is provided with a post-treatment tape for rounding and fixing after use, and the second sheet material of the exterior body of the back body is closer to the waist opening than the post-treatment tape. The pants type disposable diaper according to claim 1 or 2, wherein   The underpants type disposable of any one of Claims 1-3 in which the rear end of the said 2nd sheet material in the said exterior body of the back body is located below the lowest waist edge elastic elastic member. Diapers.   Any one of the said 1st sheet | seat material and 2nd sheet | seat material is the spun bond nonwoven fabric which uses the fiber of a polypropylene or its copolymer, or the core-sheath fiber which made the core component of polypropylene a constituent fiber. A pants-type disposable diaper according to item 1. An inner layer facing the inside of the waist edge elastic elastic member and an outer layer facing the outer side of the waist edge elastic elastic member formed of at least one of the first sheet material and the second sheet material. And
The inner layer and the outer layer are intermittently arranged in the width direction, joined by an adhesive or welding process continuous in the direction crossing the width direction, and a sheet joint is formed,
The waist edge elastic elastic member is fixed to at least one of the inner layer and the outer layer at a position intersecting with the sheet joint portion,
As the inner elastic layer and the outer layer contract with the contraction of the elastic member at the waist edge, the portions located between the sheet joints in the inner layer and the outer layer swell in opposite directions to form creases, respectively. And
The waist edge part which does not have the sheet joint part and the waist edge elastic elastic member at the end part on the waist opening part side of the waist edge part of the exterior body, and whose longitudinal range is located closest to the waist opening part side With a non-joint / non-elastic elastic member region wider than the interval between the elastic elastic member and the waist edge elastic elastic member adjacent thereto,
The underpants type disposable diaper of any one of Claims 1-5.   The distance from the edge of the waist opening to the tip of the seat joint on the side of the waist opening is 3 to 15 mm, and the elastic elastic member of the waist edge located on the most waist opening side from the edge of the waist opening The underpants type disposable diaper of Claim 6 whose distance to is 5-20 mm. The sheet joint is formed by the adhesive,
Among the portions where the sheet joint portion and the waist edge elastic elastic member intersect, the adhesive is continued in the direction intersecting the width direction on the inner layer side and the outer layer side of the waist edge elastic elastic member. By this, the waist edge elastic elastic member is fixed to the inner layer and the outer layer by the adhesive,
The pants-type disposable diaper according to claim 6 or 7.   The underpants type according to any one of claims 6 to 8, wherein a dimension in the width direction of each sheet joint portion is 0.5 to 4 mm, and an interval in the width direction between adjacent sheet joint portions is 4 to 8 mm. Disposable diapers.   The underpants type disposable diaper according to any one of claims 1 to 9, wherein an interval between adjacent waist edge elastic elastic members is 10 mm or less. Each said inner and outer layers, thickness 0.1 to 1 mm, a nonwoven fabric having a basis weight of 10 to 20 g / m ^2, pants-type disposable diaper according to any one of claims 1 to 10.   The underpants type disposable diaper according to any one of claims 1 to 11, wherein the waist edge elastic elastic member has a stretch ratio of 200 to 350% in a state where the waist edge is fully developed in the width direction.   The pants type disposable according to any one of claims 1 to 12, wherein the inner layer and the outer layer are non-woven fabrics having a bending resistance in the width direction higher than a bending resistance in a direction orthogonal to the width direction. Diapers.