JP2023135824A - Underpants type disposable wearing article - Google Patents

Abstract

To improve wearing feeding and appearance of a width wide part.SOLUTION: A wearing article is configured so that an intermediate part M whose both side edges are edges 29 of leg openings, has a wide width part V whose width becomes gradually wider as going to a waist part T from a crotch part, the wide width part V has: a side non-stretchable region A1 provided on each of both side parts; and an intermediate stretchable region A2 which is adjacent to the side non-stretchable regions A1 and is stretched/shrunk in a width direction WD with the intermediate elastic member 26. The intermediate elastic member 26 has: a first part 26a fixed in the intermediate stretchable region A2; and a non fixed second part 26b which is in the side non-stretchable region A1. A side edge of the wide width part V passes a position which is separated outward from a virtual circle VC whose radius is equal to a natural length of the second part 26b and whose center is a boundary between the first and second parts 26a, 26b. The underpants type disposable wearing article is configured so that there is provided a junction 23 on an edge region A3 which is parallel to the side edge of the wide width part V and is between the virtual line VL and the side edge of the wide width part V which are separated each other by a shortest distance between the side edge of the wide width part V and the virtual circle VC.SELECTED DRAWING: Figure 8

Description

The present invention relates to a pants-type disposable wearing article.

Pant-type disposable diapers, pant-type disposable sanitary napkins, pant-type disposable diaper covers, and other pant-type disposable diaper covers have an annular torso area and a back body area that extends from the torso area of the front body through the crotch area. It has a middle part that continues to the waist circumference, leg openings are formed on both sides of the middle part, and a waist opening is formed above the waist circumference.

In order to improve the fit to the wearer's body surface, such pants-type disposable diapers have a laminated structure with multiple sheet layers around the waist and in the middle. Elongated elastic members extending along the widthwise direction are attached at intervals in the front-rear direction and are extended in the width direction to make the elastic members expandable and contractible (see, for example, Patent Documents 1 to 3).

In addition, in order to cover a wider range of the buttocks and groin area, it is known that the middle part has the narrowest part in the crotch area, and has a widened part that gradually becomes wider from there to the waist area. (For example, see Patent Document 3). In this case, both side edges of the intermediate portion become the edges of the leg openings.

However, if the elastic member provided in the widened portion along the width direction is fixed to the side edges or the vicinity thereof, the side edges of the widened portion will have a wavy shape, which will have a considerable effect on the feeling of wearing and appearance.

JP2021-23408A Patent No. 6839102 JP2016-067436A

Therefore, the main object of the present invention is to improve the feeling of wearing and the appearance of the widened portion.

The pants-type disposable wearing article that solved the above problems is as follows.
<First aspect>
a torso region formed in an annular shape; an intermediate region extending from the lower edge of the torso region of the front body through the crotch region to the lower edge of the torso region of the rear body region; and a middle region formed on both sides of the intermediate region. and a waist opening formed above the waist circumference,
Both side edges of the intermediate portion form edges of the leg opening,
The intermediate portion has a narrowest portion in the crotch region, and has a widened portion that gradually becomes wider from there to the waist region of the front body and the waist region of the rear body,
The widened portion of at least one of the front body and the back body includes a side non-stretchable region provided on both sides, an intermediate stretchable region adjacent to the center side in the width direction of the side non-stretchable region, and the intermediate stretchable region. an elongated intermediate elastic member extending along the width direction so as to have a first portion located within the region and a second portion located within the side non-stretchable region; a first sheet extending across the side non-stretchable region and the middle stretchable region; a second sheet extending across the side non-stretchable region and the middle stretchable region so as to cover the back side of the intermediate elastic member; and at least in the front-rear direction. a joint portion where the first sheet and the second sheet are joined, the joint portion being spaced apart from each other;
The intermediate elastic region has a fixing portion that fixes at least both ends of the first portion and at least one of the first sheet and the second sheet so as to expand and contract in the width direction together with the intermediate elastic member. ,
The second portion is not fixed to the first sheet and the second sheet and is contracted to its natural length,
The side edge of the widened portion has a shape that passes through a position apart from the outside of a virtual circle whose center is the boundary between the first portion and the second portion and has a radius equal to the natural length of the second portion,
The joint portion is provided in an edge region between the side edge of the widened portion and an imaginary line parallel to the side edge of the widened portion and separated by the shortest distance between the side edge of the widened portion and the virtual circle. are doing,
A pants-type disposable wearing article characterized by:

(effect)
In this pant-type disposable wearing article, the widened portion has side non-stretchable regions on both sides, and an intermediate stretchable region adjacent to the center side in the width direction. Therefore, while ensuring fit through the intermediate stretchable region, the side edges of the widened portion do not have a wavy shape, which has little effect on the feeling of wearing and appearance. In order to provide such a side non-stretchable region, it is necessary to contract the second portion of the intermediate elastic member to its natural length without fixing it to the first sheet and the second sheet. The first sheet and the second sheet open at the side edges of the intermediate elastic member, and the unfixed second portion of the intermediate elastic member protrudes, which may deteriorate the feeling of wearing and the appearance. However, in this pants-type disposable wearing article, since the joint portion of the first sheet and the second sheet is located at a position sufficiently away from the base of the second portion, the first sheet and the second sheet are connected at the side edge of the widened portion. The two sheets are difficult to open, and even if they are opened to some extent, the second portion of the intermediate elastic member is difficult to protrude.

<Second aspect>
The edge region extends from a direction of 15 degrees toward the waist circumference to a direction of 90 degrees toward the opposite side, when the side in the width direction is 0 degrees when viewed from the center of the virtual circle. have at least one
A pants-type disposable wearing article according to the first aspect.

(effect)
The second portion of the intermediate elastic member often faces to the side before use, and tends to move toward the crotch when worn. Even if the first sheet and the second sheet at the side edges of the widened part become difficult to open at a position close to the two parts, and the first sheet and the second sheet open slightly at the part that does not have a joint part, there is no middle part. The second portion of the elastic member is less likely to be exposed.

<Third aspect>
A plurality of the intermediate elastic members are provided in the widened portion at intervals in the front-rear direction,
The edge region is a range from 0° to a direction of 15° toward the waist area, and from 0° to a direction of 15° toward the waist, when the side in the width direction is 0° when viewed from the center of the virtual circle in each intermediate elastic member. It has one joint part each in a range up to 90° on the side opposite to the waist circumference side,
Among the intermediate elastic members adjacent in the front-rear direction, when the side in the width direction when viewed from the center of the virtual circle in the intermediate elastic member on the waist side is 0°, the waist side from 0° The joint part of the edge region located in the range up to 90 degrees on the opposite side, and the side in the width direction when viewed from the center of the virtual circle in the intermediate elastic member on the side opposite to the waist circumference side. The joint portion of the edge region located in a range from 0° to a direction of 15° toward the waist circumference is the same joint portion,
A pants-type disposable wearing article according to the second aspect.

(effect)
When a plurality of intermediate elastic members are provided in the widened portion, by arranging the joints in the edge region as in this embodiment, the first sheet and the second sheet at the side edges of the widened portion can be connected with the minimum number of joints. The sheets are difficult to open, and even if the first sheet and the second sheet are slightly opened in a portion that does not have a joint, the second portion of the intermediate elastic member is not easily exposed there. Therefore, it is possible to suppress a decrease in flexibility due to providing a joint in the edge region.

<Fourth aspect>
The joint portion includes a pair of first joint portions that are in close contact with each other on both front and rear sides of the first portion, and a second joint portion located in the side non-stretchable region,
The pairs of first joints are repeatedly provided at intervals in the width direction,
The fixed part is a cylindrical part consisting of a pair of first joint parts and a part located between the pair of first joint parts of the first sheet and the second sheet,
The second joint portion is repeatedly provided in the side non-stretchable region at intervals in the front-rear direction and the width direction,
The side non-stretchable region includes a first region extending from a virtual extended portion that extends the first portion laterally along the width direction, the first region being equal to or less than the radius of the virtual circle from the front side, and a first region extending from the virtual extended portion to the rear side from the virtual extended portion. and a second area that is less than or equal to the radius of the virtual circle,
The first region and the second region each have the second joint portion,
At least one of the second joint located in the first region and the second joint located in the second region is located in the edge region,
The distance in the width direction between the pair of first joint portions located most laterally and the second joint portion adjacent to the side, and the distance between the second joint portions adjacent in the width direction are equal, and is less than or equal to the radius of the virtual circle;
The pants-type disposable wearing article according to any one of the first to third aspects.

(effect)
This aspect is preferable because there is little difference in appearance between the side non-stretchable regions and the middle stretchable region, and the middle stretchable region has excellent flexibility.

<Fifth aspect>
The area of each of the second joints is the same as or smaller than the area of the first joint,
The area ratio of the second joint portion that occupies the side non-stretchable region is smaller than the area ratio of the first joint portion that occupies the intermediate stretchable region.
The pants-type disposable wearing article according to the fourth aspect.

(effect)
It is preferable to provide the second joint part smaller than the first joint part and sparsely provided as in this aspect, because it is possible to make the side non-stretchable region near the edge of the widened part flexible.

<Sixth aspect>
The side edge of the widened portion has a curved portion in which the center of curvature is located on the inside, extending on both front and rear sides of a virtual extended portion obtained by extending at least one of the first portions laterally along the width direction.
The pants-type disposable wearing article according to any one of the first to fifth aspects.

(effect)
It is preferable that the side edges of the widened portions have the shape as in this embodiment because it is easy to secure a wide edge area.

As described above, the present invention provides advantages such as improved wearing comfort and appearance of the widened portion.

FIG. 2 is a plan view (inner side) of the pant-type disposable diaper in an unfolded state. FIG. 2 is a plan view (outer surface side) of the pant-type disposable diaper in an unfolded state. FIG. 2 is a perspective view of the pants-type disposable diaper being worn. 2 is a sectional view taken along the line CC in FIG. 1. FIG. 2 is a sectional view taken along line AA in FIG. 1. FIG. 2 is a sectional view taken along line BB in FIG. 1. FIG. FIG. 7 is an enlarged plan view (outer surface side) showing the widened portion of the front body in the unfolded state. FIG. 3 is an enlarged plan view (outer surface side) showing the widened portion of the rear body in the unfolded state. FIG. 7 is an enlarged plan view (outer surface side) showing the widened portion of the front body in the unfolded state. FIG. 3 is an enlarged plan view (outer surface side) showing the widened portion of the rear body in the unfolded state. FIG. 8 is a plan view (outer surface side) showing an enlarged main part of FIG. 7; FIG. 3 is a plan view for explaining dimensions.

Hereinafter, a pants-type disposable diaper will be explained in detail as an example of a pants-type disposable wearing article with reference to the accompanying drawings. Note that the dotted portions in the figure indicate bonding means such as hot melt adhesive.

1 to 8 show an example of a pants-type disposable diaper. This pant-type disposable diaper has a waist part T formed in an annular shape, and a middle part M that continues from the lower edge of the waist part T of the front body part F to the lower edge of the waist part T of the back body part B through the crotch part. It has leg openings LO formed on both sides of the middle part M, and a waist opening WO formed above the waist part T. The middle part M has the narrowest part in the crotch area, and has a widened part V that gradually becomes wider from there to the waist circumference T of the front body F and the waist circumference T of the back body B. Both side edges of portion M form edges 29 of the leg opening.

The pants-type disposable diaper is mainly formed by two assemblies, the outer body 20 and the inner body 10, and each part of the pants-type disposable diaper is formed by at least one of these assemblies. It is preferable that the interior body 10 extends from the waist T of the front body F through the crotch region to the waist T of the back body B. In the waist area T of the front body F and the waist area T of the back body B, the exterior body 20 extends laterally beyond both side edges of the interior body 10, and the exterior body 20 extends laterally from both side edges of the exterior body 20 of the front body F and the back. The side edges of the exterior body 20 of the body B are joined by welding or a joining means such as hot melt adhesive to form the side seal portion 21, thereby forming the waist opening T, the waist opening WO, and the leg opening LO. It is preferable if it is. Further, in the widened portion V, the exterior body 20 extends laterally beyond both side edges of the interior body 10, and the portion from the side edge of the widened portion V to the side edge of the interior body 10 is only the exterior body 20. It is preferable that it is formed by. Furthermore, it is preferable that the exterior body 20 extends further forward and backward than the interior body 10, and that the front and rear ends of the exterior body 20 form the edges of the waist opening WO. In the illustrated example, the exterior body 20 is continuous in the front-rear direction LD from the waist T of the front body F to the waist T of the back body B, but the width of the front body F is increased from the waist T of the front body F to the waist T of the back body B. Even if the front exterior body extending to the part V and the rear exterior body extending from the waist circumference part T of the rear body part B to the widened part V of the rear body part B are separately provided with an interval in the front-rear direction LD. Good (not shown).

(Example of structure of interior body)
As shown in FIGS. 4 to 6, the interior body 10 has a basic structure in which an absorbent body 18 is interposed between a liquid-permeable top sheet 11 and a liquid-impermeable sheet 12. The absorber 18 absorbs and retains the excreted fluid that has passed through the absorber 11. Although the planar shape of the interior body 10 is not particularly limited, it is generally approximately rectangular as shown in the illustrated example. In the illustrated example, both side edges of the interior body 10 are located outside the side edges of the exterior body 20 in the width direction WD in the crotch region, but they may coincide with the side edges of the exterior body 20, or 20 may be located closer to the center in the width direction WD than the side edges of 20.

The absorbent body 18 may have a single layer structure or a multilayer structure. The absorbent body 18 is preferably a member containing superabsorbent polymer particles, and more preferably a mixed aggregate of hydrophilic staple fibers such as pulp fibers and superabsorbent polymer particles. The absorbent body 18 may be wrapped in a packaging sheet 14 having liquid permeability and liquid retention properties, such as crepe paper, in order to maintain its shape and polymer retention.

As the superabsorbent polymer particles, those used in this type of absorbent article can be used as is. For example, they can be sieved by sieving (shaking for 5 minutes) using a 500 μm standard sieve (JIS Z8801-1:2006). It is desirable that the proportion of particles remaining on the sieve is 30% by weight or less, and the proportion of particles remaining on the sieve is A content of 60% by weight or more is desirable.

The superabsorbent polymer particles are not particularly limited, but those having a water absorption rate of 35 to 60 seconds and a water absorption amount of 50 to 70 g/g can be suitably used. Superabsorbent polymer particles include starch-based, cellulose-based, and synthetic polymer-based particles, including starch-acrylic acid (salt) graft copolymers, saponified starch-acrylonitrile copolymers, and cross-linked sodium carboxymethyl cellulose. Materials such as polyesters and acrylic acid (salt) polymers can be suitably used. The basis weight of the superabsorbent polymer particles can be determined as appropriate depending on the amount of absorption required for the product. Therefore, although it cannot be generalized, it can be set at 100 to 350 g/m ² .

The shape of the absorbent body 18 can be determined as appropriate, and may be rectangular, but it is preferable to have a constricted part 13 in the crotch area that is narrower than both the front and rear sides. The dimensions of the constricted portion 13 can be determined as appropriate, and the width of the narrowest portion can be approximately 40 to 60% of the total width of the absorbent body 18.

As the top sheet 11 arranged on the front side (skin contact side) of the absorber 18, perforated or non-perforated nonwoven fabric, perforated plastic sheet, etc. are suitably used. The material fibers constituting the nonwoven fabric can be synthetic fibers such as polyolefins such as polyethylene or polypropylene, polyesters, and polyamides, as well as recycled fibers such as rayon and cupro, and natural fibers such as cotton. A nonwoven fabric obtained by an appropriate processing method such as a spunbond method, a thermal bond method, a melt blown method, or a needle punch method can be used. Among these processing methods, the spunlace method is superior in terms of flexibility and drapability, and the thermal bond method is superior in that it is bulky and soft. When a large number of through holes are formed in the top sheet 11, urine etc. can be absorbed quickly. In the illustrated example, the top sheet 11 wraps around the side edges of the absorbent core 18 and extends to the back side of the absorbent core 18 .

The liquid-impermeable sheet 12 placed on the back side (non-skin contact side) of the absorbent body 18 is made of a liquid-impermeable plastic sheet such as polyethylene or polypropylene. Those that have the following are preferably used. This water-blocking/breathable sheet can be obtained by melt-kneading inorganic fine particles such as calcium carbonate in an olefin resin such as polyethylene or polypropylene to form a sheet, and then stretching the sheet in uniaxial or biaxial directions. A microporous sheet can be suitably used. In the illustrated example, the liquid-impermeable sheet 12 is folded back together with the top sheet 11 on both sides of the absorber 18 in the width direction WD, but the structure is not limited to this, and other known structures may be adopted. be able to.

Three-dimensional gathers BS that fit around the legs are formed on both sides of the interior body 10. As shown in FIGS. 5 and 6, the three-dimensional gathers BS includes a fixing part fixed to the side of the back surface of the interior body 10, and a part extending from the fixing part to the side of the interior body to the front side of the interior body. The main body extends to the inner body, the front and rear ends of the main body are fixed to the sides of the surface of the interior body in a fallen state, and the space between these fallen parts is not fixed. The free portion is formed by a three-dimensional gathered sheet 15 made into a double sheet by folding, and an elongated gathered elastic member 16 is disposed at the tip of the free portion between the double sheets. . Due to this structure, the free portion of the three-dimensional gathers BS that protrudes from the side edge of the absorbent body due to contraction of the gather elastic member 16 rises as shown by the two-dot chain line in FIG. 5 in the product state. As the three-dimensional gather sheet 15, a water-repellent nonwoven fabric is suitably used.

As the gather elastic member 16, commonly used materials such as styrene rubber, polyolefin rubber, urethane rubber, ester rubber, polyurethane, polyethylene, polystyrene, styrene butadiene, silicone, and polyester can be used. Further, in order to make it difficult to see from the outside, it is preferable that the thickness be 925 dtex or less, the elongation rate be 150 to 350%, and the spacing be 7.0 mm or less. As the gather elastic member 16, in addition to the string shape as shown in the figure, a tape shape having a certain width can also be used.

Similarly to the top sheet 11, the material fibers constituting the three-dimensional gather sheet 15 described above include synthetic fibers such as polyolefins such as polyethylene or polypropylene, polyesters, and polyamides, recycled fibers such as rayon and cupro, and cotton. Natural fibers can be used, and nonwoven fabrics obtained by appropriate processing methods such as spunbonding, thermal bonding, melt-blowing, and needle punching can be used. It is better to use a non-woven fabric that has excellent breathability and suppresses air permeability. Furthermore, for the three-dimensional gather sheet 15, silicone-based, paraffin metal-based, and alkylchromic chloride-based water repellents are used to prevent the permeation of urine, etc., prevent rashes, and improve the feel (dry feeling) on the skin. It is desirable to use water-repellent nonwoven fabric coated with

(Example of structure of exterior body)
As shown in FIGS. 4 to 6, the exterior body 20 includes a first sheet 20A disposed on the front side, a second sheet 20B disposed on the back side, and the first sheet 20A and the second sheet 20B. and an elastic member disposed between the folded part 20C formed by folding the second sheet 20B inward at the waist opening edge, and the outer body 20 is By contracting, the exterior body 20 is given elasticity. The planar shape is generally hourglass-shaped as a whole so that both sides of the intermediate portion in the width direction WD form edges 29 of the leg openings. The first sheet 20A and the second sheet 20B may be one layer and the other layer in which one sheet is folded back at the edge of the waist opening WO or the edge 29 of the leg opening and overlapped.

The illustrated exterior body 20 includes a waist elastic member 24 disposed at a waist portion W of an annular waist portion T formed by joining a front body F and a back body B; It includes a waist lower elastic member 25 disposed in the lower waist part U on the crotch side than the waist part W, and an intermediate elastic member 26 disposed in the middle part M. In addition, in the illustrated example of the exterior body 20, an elongated elastic member that continues from the side seal part 21 of the front body part F to the side seal part 21 of the back body part B along the edge 29 of the leg opening is not provided. Further, it does not have an elongated elastic member extending from each side seal portion 21 to the crotch area along the edge 29 of the leg opening.

The waist elastic members 24 are elongated elastic members along the width direction WD, which are disposed at intervals in the front-rear direction LD at the waist portion W, and are fixed in a state where they are stretched in the width direction WD at a predetermined expansion rate. It is what was done. As the waist elastic member 24, a tape-shaped elastic member may be used in addition to a rubber thread. Further, the waist elastic member 24 in the illustrated example is sandwiched between the nonwoven fabric of the folded portion 20C of the second sheet 20B in the waist portion W and is fixed to the second sheet 20B, but the waist elastic member 24 is and may be fixed to at least one of the first sheet 20A and the second sheet 20B. As an example, the waist elastic member 24 can include about 3 to 10 spandex rubber threads having a thickness of about 620 to 1240 dtex, spaced at intervals of about 3 to 8 mm. Further, the waist portion W is contracted in the width direction WD together with the waist elastic member 24 in the natural length state, and it is preferable that the maximum elongation in the width direction WD in the unfolded state is 160 to 320%.

The lower waist elastic members 25 are elongated elastic members along the width direction WD, which are disposed in plurality at intervals in the front-rear direction LD between the first sheet 20A and the second sheet 20B in the lower waist part U. It is fixed to at least one of the first sheet 20A and the second sheet 20B in a state of being stretched in the width direction WD at a predetermined stretching rate. As an example, the waist lower elastic member 25 may include about 10 to 25 spandex rubber threads having a thickness of about 310 to 1240 dtex, spaced at intervals of about 5 to 20 mm. Further, the waist lower part U is contracted in the width direction WD in the natural length state together with the waist lower elastic member 25, and the maximum elongation in the width direction WD in the unfolded state is preferably 160 to 320%. Note that the boundary between the waist elastic member 24 and the lower waist elastic member 25 does not necessarily have to be clear. For example, among the elastic members disposed around the waist T at intervals in the front-rear direction LD, some on the upper side function as the waist elastic members 24, even if the number cannot be specified, and the remaining elastic members function as the waist elastic members 24. It is only necessary that the elastic member 25 functions as the lower waist elastic member 25.

The intermediate elastic member 26 is an elongated elastic member along the width direction WD, which is one or more disposed at intervals in the front-rear direction LD between the first sheet 20A and the second sheet 20B in the intermediate portion M, It is fixed to at least one of the first sheet 20A and the second sheet 20B in a state of being stretched in the width direction WD at a predetermined stretching rate. As an example, the intermediate elastic member 26 may include about 1 to 10 spandex rubber threads having a thickness of about 310 to 1240 dtex, spaced at intervals of about 5 to 20 mm. Furthermore, it is preferable that the intermediate portion M contracts in the width direction WD together with the intermediate elastic member 26 in the natural length state, and that the maximum elongation in the width direction WD in the unfolded state is 160 to 320%.

As shown in FIG. 2, after the waist lower elastic member 25 and the intermediate elastic member 26 are continuously fixed to the exterior body 20 during manufacturing, the middle of the portion in the width direction WD that overlaps with the absorbent body 18 is By cutting finely in a predetermined cutting pattern, etc., a non-stretchable region is formed where the contractile force of the elastic members 25, 26 does not substantially act, and a portion extending laterally from this non-stretchable region is subjected to the contractile force of the elastic members 25, 26. (that is, a region that elastically expands and contracts together with the lower waist elastic member 25 and the intermediate elastic member 26). Thereby, unnecessary shrinkage of the inner body 10 (particularly the absorbent body 18) in the width direction WD can be prevented. Of course, although not shown, the lower waist elastic member 25 and the intermediate elastic member 26 may be continuous across the interior body 10.

Unlike the illustrated example, the intermediate elastic member 26 may be provided only on the front body F or the back body B.

As shown in FIGS. 2, 7, and 8, the exterior body 20 has joint parts 22 and 23, where the first sheet 20A and the second sheet 20B are joined, which are spaced apart at least in the front-rear direction LD. have The joint parts 22 and 23 can be formed using hot melt adhesive, but they can also be formed by a welding means such as heat sealing or ultrasonic sealing (that is, the welding part between the first sheet 20A and the second sheet 20B). can. The joints 22 and 23 may be continuous in the width direction WD, but it is preferable that they are provided at intervals in the width direction WD as in the example shown in the figure, since this provides more flexibility. .

The joint portions 22 and 23 may be provided closely or separately on both the front and rear sides of the elastic members 24 to 26. Such joint parts 22 and 23 are suitable for welding because the first sheet 20A and the second sheet 20B are joined without using the elastic members 24 to 26. For example, the first sheet 20A and the second sheet 20B are repeatedly provided with pairs of joint portions 22 that are in close contact with each other on both front and rear sides of the elastic members 25 and 26 at intervals in the width direction WD, and the first sheet 20A and the second sheet 20B are Among these, it is preferable to adopt a structure in which the elastic members 25 and 26 are tightened and fixed from the periphery by a cylindrical fixing part 27 consisting of a pair of joint parts 22 and a part located between them (first structure). This is a structure similar to that described in Patent Document 2, and by forming the joint portion 22 of the first sheet 20A and the second sheet 20B, the elastic members 25 and 26 are attached to the first sheet 20A and the second sheet 20B. It has the advantage that it can also be fixed. It is preferable that the fixing parts 27 are provided at intervals in the front-rear direction LD (that is, adjacent fixing parts 27 in the front-rear direction LD are separated). The distance d1 (see FIG. 12) of the fixing portion 27 in the front-rear direction LD can be determined as appropriate, for example, 0.70 to 0.95 of the distance d2 (see FIG. 12) between the elastic members 25 and 26 adjacent to each other in the front-rear direction LD. It can be doubled. In the illustrated example of the elastic region, only a pair of joints 22 are provided in close contact with each other at the front and rear of the elastic members 25 and 26, but in addition, as shown in FIG. The joint portion 23 can also be provided at a position (for example, approximately at the center of the area between adjacent elastic members 25 and 26).

Although not shown, in the first structure, the surface of the portion of the elastic members 25 and 26 located between the pair of joints 22 does not have to be welded to the first sheet 20A and the second sheet 20B; It is preferable that the elastic members 25 and 26 are welded to at least one of the first sheet 20A and the second sheet 20B because the fixation of the elastic members 25 and 26 becomes stronger (second structure). Alternatively, or in addition to this, a hot melt adhesive may be applied to the outer circumferential surfaces of the elastic members 25, 26 at appropriate locations such as between the pair of joints 22 in the elastic members 25, 26, or at both ends of the elastic regions. The fixation of the elastic members 25 and 26 to the first sheet 20A and the second sheet 20B may be reinforced (third structure).

Although not shown, the joint portion 23 that welds the first sheet 20A and the second sheet 20B without using the elastic members 24 to 26 is located at a position away from the elastic members 24 to 26 in the front-rear direction LD (for example, adjacent to the front-rear direction LD). A fixing part 27 is provided only at approximately the center of the area between the matching elastic members 24 to 26), and fixes the elastic members 24 to 26 to at least one of the first sheet 20A and the second sheet 20B with hot melt adhesive. It can also be provided only at both ends of the region (fourth structure). The example shown in FIG. 10 in which the pair of joints 22 is omitted corresponds to this fourth structure.

On the other hand, although not shown, the joint portion may be provided at a position overlapping the elastic members 24 to 26. Such a joint is suitable for use with a hot melt adhesive because the first sheet 20A and the second sheet 20B are joined via the elastic members 24 to 26. More specifically, the elastic members 24 to 26 are sandwiched between the first sheet 20A and the second sheet 20B by applying hot melt adhesive only to the outer circumferential surfaces of the elastic members 24 to 26 using an application means such as a comb gun or a SureWrap nozzle. The elastic members 24 to 26 can be fixed to the first sheet 20A and the second sheet 20B, and the joints between the first sheet 20A and the second sheet 20B can be fixed using only the hot melt adhesive applied to the outer peripheral surfaces of the members 24 to 26. (fifth structure). In this case, the joint parts (hot melt adhesive application parts) can be provided at intervals in the width direction WD, or can be provided continuously in the width direction WD.

The dimensions and spacing of the joints 22 and 23 can be determined as appropriate, and as an example, the dimension y1 (see FIG. 12) of the joint 22 in the front-rear direction LD can be 0.5 to 3.0 mm. Further, the distance d3 (see FIG. 12) between the pair of joint portions 22 in the longitudinal direction LD in the first structure is shorter than the dimension in the longitudinal direction LD of the natural lengths of the elastic members 25 and 26, for example, 0.55 to 0. The distance y2 (see FIG. 12) between the adjacent joint portions 22 and 23 in the front-rear direction LD may be approximately 80 mm. In the first to fourth structures, when the joint portions 22 and 23 are arranged at intervals in the width direction WD, the arrangement of the joint portions 22 and 23 is not particularly limited, and may be arranged in a matrix as in the illustrated example. , an arrangement in which the positions in the width direction WD are shifted (eg, staggered) may also be used. In this case, the dimension w1 (see FIG. 12) of the joint parts 22 and 23 in the width direction WD is 0.2 to 1.5 mm, and the interval w2 (see FIG. 12) in the width direction WD is 3.5 to 8.0 mm. be able to.

The joining structure of the first sheet 20A and the second sheet 20B and the fixing structure of the elastic members 24 to 26 in the exterior body 20 may be the same in all of the waist part W, the lower waist part U, and the middle part M. , may differ only partially. For example, the waist portion W may adopt the fifth structure, and the lower waist portion U and middle portion M may adopt any one of the first to fourth structures.

(widening part)
Characteristically, as shown in FIGS. 7 and 8, the widened portions V of the front body F and the back body B are sandwiched between the first sheet 20A and the second sheet 20B that span the entire width direction WD. The first sheet 20A and the second sheet 20B have joint portions 22 and 23, which are spaced apart from each other in at least the front-rear direction LD and are joined to the first sheet 20A and the second sheet 20B. These widened portions V have side non-stretchable regions A1 provided on both sides, and an intermediate stretchable region A2 adjacent to the center side of the side non-stretchable regions A1 in the width direction WD. A boundary D between the side non-stretchable region A1 and the middle stretchable region A2 is indicated by a two-dot chain line in the figure. The intermediate elastic member 26 has a first portion 26a located within the intermediate stretchable region A2 and a second portion 26b located within the side non-stretchable region A1. Further, the intermediate elastic region A2 is a fixing portion that fixes at least both ends of the first portion 26a and at least one of the first sheet 20A and the second sheet 20B so as to expand and contract in the width direction WD together with the intermediate elastic member 26. 27, and the second portion 26b is contracted to its natural length without being fixed to the first sheet 20A and the second sheet 20B. That is, the second portion 26b can freely move between the first sheet 20A and the second sheet 20B. Further, the side edge of the widened portion V (corresponding to the edge 29 of the leg opening in the illustrated example) has an imaginary radius centered on the boundary between the first portion 26a and the second portion 26b and equal to the natural length of the second portion 26b. It has a shape that passes through a position apart from the outside of the circle VC, is parallel to the side edge of the widened part V, and is the shortest distance between the side edge of the widened part V and the virtual circle VC (as in the illustrated example, there are multiple virtual circles VC). In the case of , in the edge area A3 between the virtual line VL separated by the distance (meaning the shortest distance between the virtual circle VC closest to the widened part V and the side edge of the widened part V) and the side edge of the widened part V, It has a joint part 23. The length of the second portion 26b is the value obtained by dividing the dimension in the width direction WD from the boundary between the first portion 26a and the second portion 26b to the side edge of the widened portion V by the magnification when the intermediate elastic member 26 is attached. approximately equal to.

In this way, when the side non-stretchable regions A1 are provided on both sides of the widened portion V and the intermediate stretchable region A2 is provided adjacent to the center side in the width direction WD, the fit is ensured by the middle stretchable region A2. At the same time, the side edges of the widened portion V do not have a wavy shape, so that the feeling of wearing and the appearance are less affected. In order to provide such a side non-stretchable region A1, it is necessary to contract the second portion 26b of the intermediate elastic member 26 to its natural length without fixing it to the first sheet 20A and the second sheet 20B. In that case, the first sheet 20A and the second sheet 20B open at the side edges of the widened portion V, and the non-fixed second portion 26b of the intermediate elastic member 26 protrudes, which may deteriorate the feeling of wearing and the appearance. However, if the joint part 23 of the first sheet 20A and the second sheet 20B is located at a position sufficiently away from the root of the second part 26b as shown in the illustrated example, the first part The sheet 20A and the second sheet 20B are difficult to open, and even if they are opened to some extent, the second portion 26b of the intermediate elastic member 26 is difficult to protrude.

The position of the joint portion 23 of the edge region A3 can be determined as appropriate. One preferable example is, as shown in an enlarged view in FIG. 11, when the side in the width direction WD is 0° when viewed from the center of the virtual circle VC, the opposite side is located at 15° on the waist circumference T side. has at least one joint 23 in the edge region A3 in the range up to 90° direction (more preferably in the range from 10° direction on the waist circumference T side to 80° direction on the opposite side). It is something that The second portion 26b of the intermediate elastic member 26 often faces to the side before use, and tends to move toward the crotch when worn. At a position close to the second portion 26b of the member 26, the first sheet 20A and the second sheet 20B at the side edges of the widened portion V become difficult to open, and the first sheet 20A and the second sheet 20A and the second sheet at the side edge of the widened portion V become difficult to open. Even if 20B opens somewhat, the second portion 26b of the intermediate elastic member 26 is unlikely to be exposed there. Therefore, the edge area A3 includes a range from 0° to a direction of 15° toward the waist T side, and 0° It is more preferable to have one joint 23 in the range from 90 degrees to the side opposite to the waist T side. In particular, when a plurality of intermediate elastic members 26 are provided in the widened portion V at intervals in the front-rear direction LD, among the intermediate elastic members 26 adjacent in the front-rear direction LD, the intermediate elastic members 26 on the waist circumference T side When the side of the width direction WD is 0° when viewed from the center of the virtual circle VC in 23 and the intermediate elastic member 26 on the opposite side, a range from 0° to a direction of 15° toward the waist T side, when the side in the width direction WD is 0° when viewed from the center of the virtual circle VC in the intermediate elastic member 26 on the opposite side. If the joints 23 of the edge region A3 located in the edge region A3 are the same joints 23, the number of joints 23 of the edge region A3 will be minimized, and the reduction in flexibility due to the provision of the joints 23 in the edge region A3 will be minimized. This is preferable because it can be suppressed.

The joint parts 22 and 23 provided in the region of the widened part V excluding the edge region A3 may have any of the above-mentioned first to fifth structures, but may have the above-mentioned first structure or second structure as in the illustrated example. This structure is preferable from the viewpoint of flexibility. To explain the illustrated example in more detail, the joints 22 and 23 of the widened portion V are a pair of first joints 22 that are in close contact with each other on both front and rear sides of the first portion 26a, and a second joint that is located in the side non-stretchable region A1. 23. The pairs of first joints 22 are repeatedly provided at intervals in the width direction WD, and the fixing part 27 is connected to the pair of first joints 22 of the first sheet 20A and the second sheet 20B, and the first joint It is a cylindrical portion consisting of a portion located between the pair of portions 22. The second joint portions 23 are repeatedly provided within the side non-stretchable region A1 at intervals in the front-rear direction LD and the width direction WD. In addition, in the side non-stretchable area A1, there is a first area h1 which is less than or equal to the radius of the virtual circle VC on the front side from a virtual extension part obtained by extending the first part 26a laterally along the width direction WD, and a first area h1 which is less than or equal to the radius of the virtual circle VC from the virtual extension part. It has a second joint part 23 in a second region h2 which is less than or equal to the radius of the virtual circle VC on the rear side, and has a second joint part 23 located in the first region and a second joint part 23 located in the second region. At least one of the joints 23 is located in the edge area A3. Further, the distance in the width direction WD between the pair of first joint portions 22 located most laterally and the second joint portion 23 adjacent to the side, and the distance between the second joint portions 23 adjacent in the width direction WD. are equal and less than or equal to the radius of the virtual circle VC. As a result, in the illustrated example, there is little difference in appearance between the side non-stretchable region A1 and the middle stretchable region A2, and the middle stretchable region A2 has excellent flexibility.

In particular, as shown in the illustrated example, the area of each second joint 23 is the same as or smaller than the area of the first joint 22, and the area ratio of the second joint 23 to the side non-stretchable region A1 is , it is preferable that the area ratio is smaller than the area ratio of the first joint portion 22 in the intermediate stretchable region A2 because the side non-stretchable region A1 near the edge of the widened portion V becomes flexible.

In the example shown in FIGS. 7 and 8, the second joint 23 located in the side non-stretchable area A1 is also provided in areas other than the edge area A3, but as shown in FIG. may be provided.

On the other hand, the side edge of the widened part V may be a curved line in which the center of curvature is located only outside the side edge, like the widened part V of the front body F shown in FIG. 7, but as shown in FIG. Like the widened part V of the back body part B, a curved part in which the center of curvature is located inward extends across both front and rear sides of a virtual extended part obtained by extending at least one first part 26a laterally along the width direction WD. This is preferable because it is easy to secure a wide edge area A3. In other words, in the widened portion V of the front body F, a curved portion in which the center of curvature is located on the inside extends across both front and rear sides of a virtual extended portion obtained by extending at least one first portion 26a laterally along the width direction WD. Alternatively, in this case, the widened portion V of the back body B may be a curved line in which the center of curvature is located only on the outside of the side edges.

In the illustrated example, the widened portions V of both the front body F and the back body B have side non-stretchable regions A1, but either one (for example, the front body F) does not have the side non-stretchable regions A1. (In other words, the entire width direction WD becomes the intermediate elastic region A2). In addition, in the illustrated example, both the front body part F and the back body part B have the widened part V and the intermediate elastic region A2, but either one (for example, the front body part F) does not have to have the widened part V. It is also possible to have the widened portion V but not have the intermediate elastic region A2.

<Explanation of terms in the specification>
When the following terms are used in the specification, unless otherwise specified in the specification, they have the following meanings.
・"Anteroposterior direction" means the direction indicated by the symbol LD in the figure (vertical direction), and "width direction" means the direction indicated by WD in the figure (horizontal direction), and the longitudinal direction and the width direction are orthogonal.
・The term "deployed state" means a state in which the product is flattened without contraction (including any contraction such as contraction caused by an elastic member) or slack.

- "Front side" means the side closer to the wearer's skin when worn, and "back side" means the side farther from the wearer's skin when worn.

- "Front side" means the "front" side, and "back side" means the "back side" side.

・"Area ratio" means the ratio of the target part to the unit area, and is expressed as a percentage by dividing the total area of the target parts (e.g. joints) in the target area (e.g. intermediate stretchable area) by the area of the target area. It represents. In a configuration in which a large number of target parts are provided at intervals, it is desirable to set the target area to a size that includes 10 or more target parts and calculate the area ratio. For example, the area ratio of the joint can be measured using, for example, VHX-1000 (trade name, manufactured by KEYENCE), with the measurement conditions set to 20x, and according to the following procedure.
(1) Set it on a 20x lens and adjust the focus. Adjust the position of the exterior body so that the joint area fits 4x6.
(2) Specify the brightness of the area of the joint and measure the area of the joint.
(3) Click on color extraction for “Area measurement” in “Measurement/Comments”. Click on the joint part.
(4) Click "Batch measurement", check "Display measurement result window", and save as CSV data.

- "Elongation rate" means a value when the natural length is 100%. For example, an extension ratio of 200% is synonymous with an extension ratio of 2 times.

・“Basic weight” is measured as follows. After pre-drying the sample or test piece, it is left in a test room or apparatus under standard conditions (test location: temperature 23±1°C, relative humidity 50±2%) to reach a constant weight. Pre-drying refers to making the sample or test piece constant weight in an environment at a temperature of 100°C. Note that fibers with an official moisture content of 0.0% do not need to be pre-dried. Using a sampling template (100 mm x 100 mm), cut out a sample of 100 mm x 100 mm per square meter from the test piece that has reached a constant weight. Measure the weight of the sample, multiply by 100 to calculate the weight per square meter, and use it as the basis weight.

- "Thickness" is automatically measured using an automatic thickness measuring device (KES-G5 Handy Compression Tester) under the conditions of load: 0.098 N/cm ² and pressurized area: 2 cm ² .

- "Water absorption" is measured according to JIS K7223-1996 "Water absorption test method for super absorbent resin".

・"Water absorption rate" is "time to end point" when JIS K7224-1996 "Water absorption rate test method for super absorbent resin" is performed using 2 g of super absorbent polymer and 50 g of physiological saline. shall be.

- If there is no description of the environmental conditions for the test or measurement, the test or measurement shall be conducted in a test room or equipment under standard conditions (test location: temperature 23 ± 1°C, relative humidity 50 ± 2%). do.

- Unless otherwise specified, the dimensions of each part refer to the dimensions in the unfolded state, not in the natural length state.

The present invention can be used in general pants-type disposable wearing articles such as pants-type disposable diapers such as the above-mentioned examples, pants-type sanitary napkins, pants-type disposable diaper covers, and the like.

10... Interior body, 11... Top sheet, 12... Liquid-impermeable sheet, 13... Constricted portion, 14... Packaging sheet, 15... Three-dimensional gather sheet, 16... Gathered elastic member, 18... Absorbent body, 20... Exterior body, 20A...first sheet, 20B...second sheet, 20C...folded part, 21...side seal part, 22, 23...joint part, 22...first joint part, 23...second joint part, 24...waist elastic member, 25... Waist lower elastic member, 26... Intermediate elastic member, 26a... First part, 26b... Second part, 27... Fixed part, 29... Edge of leg opening, A1... Side non-stretchable area, A2... Intermediate elastic area, A3...Edge area, B...Back body, BS...Three-dimensional gathers, F...Front body, LD...Anteroposterior direction, LO...Leg opening, M...Middle area, T...Girth area, U...Lower waist area, V...Width expansion VC...virtual circle, VL...virtual line, W...waist part, WD...width direction, WO...waist opening, h1...first region, h2...second region.

Claims (6)

a torso region formed in an annular shape; an intermediate region extending from the lower edge of the torso region of the front body through the crotch region to the lower edge of the torso region of the rear body region; and a middle region formed on both sides of the intermediate region. and a waist opening formed above the waist circumference,
Both side edges of the intermediate portion form edges of the leg opening,
The intermediate portion has a narrowest portion in the crotch region, and has a widened portion that gradually becomes wider from there to the waist region of the front body and the waist region of the rear body,
The widened portion of at least one of the front body and the back body includes a side non-stretchable region provided on both sides, an intermediate stretchable region adjacent to the center side in the width direction of the side non-stretchable region, and the intermediate stretchable region. an elongated intermediate elastic member extending along the width direction so as to have a first portion located within the region and a second portion located within the side non-stretchable region; a first sheet extending across the side non-stretchable region and the middle stretchable region; a second sheet extending across the side non-stretchable region and the middle stretchable region so as to cover the back side of the intermediate elastic member; and at least in the front-rear direction. a joint portion where the first sheet and the second sheet are joined, the joint portion being spaced apart from each other;
The intermediate elastic region has a fixing portion that fixes at least both ends of the first portion and at least one of the first sheet and the second sheet so as to expand and contract in the width direction together with the intermediate elastic member. ,
The second portion is not fixed to the first sheet and the second sheet and is contracted to its natural length,
The side edge of the widened portion has a shape that passes through a position apart from the outside of a virtual circle whose center is the boundary between the first portion and the second portion and has a radius equal to the natural length of the second portion,
The joint portion is provided in an edge region between the side edge of the widened portion and an imaginary line parallel to the side edge of the widened portion and separated by the shortest distance between the side edge of the widened portion and the virtual circle. are doing,
A pants-type disposable wearing article characterized by: The edge region extends from a direction of 15 degrees toward the waist circumference to a direction of 90 degrees toward the opposite side, when the side in the width direction is 0 degrees when viewed from the center of the virtual circle. have at least one
The pants-type disposable wearing article according to claim 1. A plurality of the intermediate elastic members are provided in the widened portion at intervals in the front-rear direction,
The edge region is a range from 0° to a direction of 15° toward the waist area, and from 0° to a direction of 15° toward the waist, when the side in the width direction is 0° when viewed from the center of the virtual circle in each intermediate elastic member. It has one joint part each in a range up to 90° on the side opposite to the waist circumference side,
Among the intermediate elastic members adjacent in the front-rear direction, when the side in the width direction when viewed from the center of the virtual circle in the intermediate elastic member on the waist side is 0°, the waist side from 0° The joint part of the edge region located in the range up to 90 degrees on the opposite side, and the side in the width direction when viewed from the center of the virtual circle in the intermediate elastic member on the side opposite to the waist circumference side. The joint portion of the edge region located in a range from 0° to a direction of 15° toward the waist circumference is the same joint portion,
The pants-type disposable wearing article according to claim 2. The joint portion includes a pair of first joint portions that are in close contact with each other on both front and rear sides of the first portion, and a second joint portion located in the side non-stretchable region,
The pairs of first joints are repeatedly provided at intervals in the width direction,
The fixed part is a cylindrical part consisting of a pair of first joint parts and a part located between the pair of first joint parts of the first sheet and the second sheet,
The second joint portion is repeatedly provided in the side non-stretchable region at intervals in the front-rear direction and the width direction,
The side non-stretchable region includes a first region extending from a virtual extended portion that extends the first portion laterally along the width direction, the first region being equal to or less than the radius of the virtual circle from the front side, and a first region extending from the virtual extended portion to the rear side from the virtual extended portion. and a second area that is less than or equal to the radius of the virtual circle,
The first region and the second region each have the second joint portion,
At least one of the second joint located in the first region and the second joint located in the second region is located in the edge region,
The distance in the width direction between the pair of first joint portions located most laterally and the second joint portion adjacent to the side, and the distance between the second joint portions adjacent in the width direction are equal, and is less than or equal to the radius of the virtual circle;
The pants-type disposable wearing article according to any one of claims 1 to 3. The area of each of the second joints is the same as or smaller than the area of the first joint,
The area ratio of the second joint portion that occupies the side non-stretchable region is smaller than the area ratio of the first joint portion that occupies the intermediate stretchable region.
The pants-type disposable wearing article according to claim 4. The side edge of the widened portion has a curved portion in which the center of curvature is located on the inside, extending on both front and rear sides of a virtual extended portion obtained by extending at least one of the first portions laterally along the width direction.
The pants-type disposable wearing article according to any one of claims 1 to 5.

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