JP6829031B2 - Pants type disposable diapers - Google Patents

Description

The present invention relates to a pants-type disposable diaper in which the width of the interior body changes.

Pants-type disposable diapers are provided with an outer body separately for the front body and the back body, or an integrated outer body extending from the front body to the back body, and an interior body including an absorber attached to the outer body. By joining the front body and the back body of the exterior body at both side portions, an annular waist circumference portion, a waist opening, and a pair of left and right leg openings are formed.

Generally, the crotch width of a pants-type disposable diaper is determined by the crotch width of the interior body, and basically does not change significantly. Therefore, the user selects a disposable diaper having a more appropriate crotch width by selecting the product size.

Japanese Unexamined Patent Publication No. 2012-100880 Japanese Unexamined Patent Publication No. 2013-144070

However, the selection of product size alone cannot completely cope with individual differences in crotch width. That is, it is common to ensure the fit to the base of the inner thigh by designing the crotch width sufficiently wide, but in that case, when wearing the diaper, the toes are likely to be caught in the crotch part. , It becomes difficult for the legs to pass through. On the other hand, if the crotch width is designed to be narrow, the legs can be easily passed through, but the fit to the base of the inner thigh is reduced, which may cause leakage.

Therefore, the present invention is to provide a pants-type disposable diaper that is easy to pass through the legs when worn and has excellent fit in the crotch portion.

Typical aspects of the present invention that have solved the above problems are as follows.
<First aspect>
An exterior body with a ring-shaped continuous waist circumference and
An interior body including an absorber that extends from the middle of the waist circumference of the front body in the width direction, through the crotch part, to the middle of the waist circumference of the back body in the width direction.
In a pants-type disposable diaper with a waist opening and a pair of left and right leg openings.
The portions of the interior body that overlap each of the waist circumference portion of the front body and the waist circumference portion of the rear body are joined to the exterior body in a plurality of width direction ranges located at intervals in the width direction. Have each
The region between the width direction ranges in the interior body is not joined to the exterior body and is a widening region in which the width can be expanded.
The exterior body has an elastic region that elastically expands and contracts in the width direction in a region where the waist circumference portion and the widening region overlap.
Pants-type disposable diapers that feature this.

(Action effect)
In the pants-type disposable diaper of the first aspect, when the leg is passed through the leg opening, almost no force is applied in the direction of expanding the waist circumference, so that the elastic region of the waist circumference does not extend in the width direction. , The widening area is not expanded in the width direction either. That is, the interior body is in the state of the minimum width. When the pants-type disposable diaper is pulled up from this state and brought to the wearing state, the force in the direction of expanding the waist circumference is applied, so that the expansion and contraction area expands in the width direction, and the widening area also expands accordingly, and the interior body The width expands. Therefore, since the width of the interior body is narrow when passing the legs, it is difficult for the legs to get caught in the crotch portion, and after mounting, the width of the interior body is expanded so that the crotch portion can be firmly fitted to the base of the inner thigh. .. Moreover, the width of the interior body is expanded by the elastic force, and the elastic force acts in the direction of maintaining the width after the expansion, so that good fit is maintained. In particular, in the first aspect, the width of the interior body is automatically changed according to the waist circumference dimension, which is a guideline for the size of the wearer's body, so that the fit is improved.

<Second aspect>
An exterior body with a ring-shaped continuous waist circumference and
An interior body including an absorber that extends from the middle of the waist circumference of the front body in the width direction, through the crotch part, to the middle of the waist circumference of the back body in the width direction.
In a pants-type disposable diaper with a waist opening and a pair of left and right leg openings.
Both the front body and the back body have elastic bands that elastically expand and contract in the width direction, passing between the waist circumference and the interior body and extending on both sides in the width direction from both side edges of the interior body. Ori,
Both ends of the elastic band are fixed to the exterior body, and the portion between both ends of the elastic band is not fixed to the exterior body.
The portion of the interior body that overlaps with the elastic band has joint portions joined to the elastic band in a plurality of width direction ranges located at intervals in the width direction.
The region between the width direction ranges in the interior body is not joined to the exterior body and the elastic band, and is a widening region in which the width can be expanded.
The elastic band has a perforation for cutting itself between the joints adjacent to each other in the width direction.
The exterior body has an elastic region that elastically expands and contracts in the width direction in a region where the waist circumference portion and the widening region overlap.
Pants-type disposable diapers that feature this.

(Action effect)
In the pants-type disposable diaper of the second aspect, when the leg is passed through the leg opening, almost no force is applied in the direction of expanding the waist circumference, so that the elastic region and the elastic band of the waist circumference extend in the width direction. The widening area is not widened in the width direction. That is, the interior body is in the state of the minimum width. When the pants-type disposable diaper is pulled up from this state and brought to the wearing state, a force is applied in the direction of expanding the waist circumference, the elastic region and the elastic band extend in the width direction, and the elastic band is automatically cut at the perforation. To do. Along with the division of the elastic band, the contraction force of the elastic band acts to pull the joint portion of the interior body toward the fixed portion side of the exterior body, so that the widening area of the interior body is expanded and the width of the interior body is increased. Expanding. Therefore, since the width of the interior body is narrow when passing the legs, it is difficult for the legs to get caught in the crotch portion, and after mounting, the width of the interior body is expanded so that the crotch portion can be firmly fitted to the base of the inner thigh. .. Moreover, the width of the interior body is expanded by the elastic force, and the elastic force acts in the direction of maintaining the width after the expansion, so that good fit is maintained. In particular, in the second aspect, unlike the first aspect in which the width of the interior body is expanded by utilizing the elasticity of the exterior body, an elastic band for expanding the width of the interior body is added, so that the exterior body is expanded. The width of the interior body can be expanded independently without affecting the elasticity, and the fit of the exterior body and the fit of the interior body can be set independently.

<Third aspect>
The crotch width of the interior body in an unused natural length state is 0.4 to 0.7 times the crotch width of the interior body when the exterior body is maximally extended in the width direction. Pants type disposable diaper according to the second aspect.

(Action effect)
If the change in the crotch width of the interior body is too small or too large, either or both of the ease of wearing and the fit of the crotch may be insufficient, so it is usually within the above range. desirable.

<Fourth aspect>
The exterior body extends integrally in the front-rear direction from the waist circumference of the front body through the crotch to the waist circumference of the back body, and the legs between the waist circumference of the front body and the waist circumference of the back body. The circumference forming portion has a constricted portion whose width becomes narrower continuously or stepwise toward the middle in the anteroposterior direction of the leg circumference forming portion.
In the unused natural length state, the crotch width of the interior body is the same as or narrower than the crotch width of the exterior body.
When the waist circumference of the exterior body is extended 1.2 times or more in the width direction, the crotch width of the interior body becomes wider than the crotch width of the exterior body.
A pants-type disposable diaper according to any one of the first to third aspects.

(Action effect)
In the fourth aspect, the structure is based on the structure in which the crotch portion is firmly supported by the exterior body, and when passing the legs, the crotch width of the interior body is made narrower than the crotch width of the exterior body to maximize the ease of passing the legs. When worn, the crotch width of the interior body can be made wider than the crotch width of the exterior body to improve the fit to the base of the inner thigh.

<Fifth aspect>
In the natural length state, the widening region is a folded portion in which both side portions in the width direction are folded back in the width direction a plurality of times, and the width of the widening region is expanded by expanding the folded portion. Pants-type disposable diaper according to any one of 1 to 4.

(Action effect)
With such a structure, it is possible to form a widening region having a large expansion / contraction change by a method known in the present art without using a special elastic material or a special elastic structure.

As described above, according to the present invention, there are advantages such as excellent fit of the crotch portion while being easy to pass through the legs when worn.

It is a plan view (inner surface side) of the pants type disposable diaper in the unfolded state. It is a plan view (outer surface side) of the pants type disposable diaper in the unfolded state. It is a top view which shows the cut pattern of an elastic member. FIG. 5 is a sectional view taken along the line CC of FIG. FIG. 1 is a sectional view taken along the line AA of FIG. It is BB sectional view of FIG. It is a top view of the interior body in the unfolded state. FIG. 7 is a sectional view taken along line DD of FIG. It is a perspective view of the wearing state of a pants type disposable diaper. It is a top view which shows roughly the inner surface of the pants type disposable diaper in a natural length state. FIG. 10 is a cross-sectional view taken along the line EE of FIG. It is a top view which shows roughly the inner surface of the pants type disposable diaper in the unfolded state. FIG. 12 is a cross-sectional view taken along the line EE of FIG. It is a top view which shows roughly the inner surface of the pants type disposable diaper in a natural length state. FIG. 14 is a cross-sectional view taken along the line FF of FIG. It is a top view which shows roughly the inner surface of the pants type disposable diaper in the unfolded state. 16 is a cross-sectional view taken along the line FF of FIG.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings. The dotted pattern portion and the X-marked portion in the drawing indicate a joining means such as a hot melt adhesive.

1 to 17 show an example of a pants-type disposable diaper. This pants-type disposable diaper (hereinafter, also simply referred to as a diaper) has an outer body 20 having a ring-shaped continuous waist circumference T, and a front body F from the middle of the width direction WD of the waist circumference, through the crotch portion. It is provided with an interior body 10 including an absorber 13 extending to the middle of the widthwise WD of the waist circumference portion of the back body B. In manufacturing, after the back surface of the interior body 10 is joined to the inner surface of the exterior body 20 by a joining means such as a hot melt adhesive (dot pattern portion in FIG. 2), the interior body 10 and the exterior body 20 are attached to the front body. It is folded at the center of the LD in the front-rear direction, which is the boundary between F and the back body B, and both side portions thereof are joined to each other by welding or hot melt adhesive to form a side seal portion 21, thereby forming a waist opening and a pair of left and right sides. It is a pants-type disposable diaper with a leg opening.

(Example of interior structure)
As shown in FIGS. 5 to 8, the interior body 10 basically has a structure in which an absorber 13 is interposed between a liquid-permeable top sheet 11 and a liquid-impermeable sheet 12 made of polyethylene or the like. , It absorbs and retains the excrement liquid that has passed through the surface sheet 11. The planar shape of the interior body 10 is not particularly limited, but it is generally a substantially rectangular shape as shown in the illustrated form.

As the liquid-permeable top sheet 11 that covers the front side (skin contact surface side) of the absorber 13, a perforated or non-perforated non-woven fabric, a porous plastic sheet, or the like is preferably used. The material fibers constituting the non-woven fabric can be olefin-based fibers such as polyethylene or polypropylene, synthetic fibers such as polyester-based and polyamide-based, recycled fibers such as rayon and cupra, and natural fibers such as cotton. , A non-woven fabric obtained by an appropriate processing method such as a spun bond method, a thermal bond method, a melt blown method, or a needle punch method can be used. Among these processing methods, the spunlace method is excellent in that it is rich in flexibility and drapeability, and the thermal bond method is excellent in that it is bulky and soft. When a large number of through holes are formed in the top sheet 11, urine or the like is quickly absorbed, and the dry touch property is excellent. In the illustrated embodiment, the top sheet 11 involves the side edge portion of the absorber 13 and extends to the back side of the absorber 13, but is not limited to this.

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

The absorber 13 is basically a known material, for example, a stack of pulp fibers, an aggregate of filaments such as cellulose acetate, or a non-woven fabric, and is formed by mixing and fixing a highly absorbent polymer as necessary. Can be used. The absorber 13 can be wrapped with a wrapping sheet 14 having liquid permeability and liquid retention, such as crepe paper, if necessary, in order to retain the shape and polymer.

Three-dimensional gather BSs that stand up on the skin side are formed on both sides of the interior body 10. As shown in FIGS. 5 and 6, the three-dimensional gather BS has a fixed portion fixed to the side portion of the back surface of the interior body, and a side portion of the surface surface of the interior body from the fixed portion via the side of the interior body. A main body that extends to the end, an inverted part that is formed by fixing the front and rear ends of the main body to the side of the surface of the interior body in an inverted state, and a freedom that is formed so that the portion of this inverted portion is not fixed. The portion is formed by a gather sheet 15 having a two-layer structure by folding back a sheet such as a non-woven fabric.

Further, between the layers of the gather sheet 15, an elongated gather elastic member 16 is arranged at the tip of a free portion or the like. As shown by the alternate long and short dash line in FIG. 5, the gather elastic member 16 is for forming a three-dimensional gather BS by erecting a non-woven fabric portion protruding from the side edge portion of the absorber by elastic elastic force.

In the illustrated form, the liquid-impermeable sheet 12 extends to the layers of the gather sheet 15, and as shown in FIG. 5, a leak-proof wall is formed on the lower end side of the three-dimensional gather BS. It is not limited to.

As the gather elastic member 16, commonly used materials such as styrene rubber, olefin 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 to dispose the thickness at 925 dtex or less, the tension at 150 to 350%, and the interval at 10.0 mm or less. As the gather elastic member 16, a tape-shaped member having a certain width can be used in addition to the thread-shaped member as shown in the illustrated figure.

When the above-mentioned gather sheet 15 is used as a non-woven fabric, the material fibers thereof are olefin-based fibers such as polyethylene and polypropylene, synthetic fibers such as polyester-based and amide-based fibers, and recycled fibers such as rayon and cupra, as in the case of the top sheet 11. It can be a natural fiber such as cotton, and a non-woven fabric obtained by an appropriate processing method such as a spun bond method, a thermal bond method, a melt blown method, a needle punch method, etc. can be used, but particularly to prevent stuffiness. It is advisable to use a non-woven fabric that suppresses the basis weight and has excellent breathability. Further, regarding the non-woven fabric of the gather sheet 15, in order to prevent the permeation of urine and the like, prevent fogging, and enhance the feel (dry feeling) to the skin, silicone- based, paraffin metal-based, and alkylchromic chloride- based water repellent. It is desirable to use a water-repellent treated non-woven fabric coated with an agent or the like.

(Structural example of exterior body)
The exterior body 20 of the illustrated form integrally extends in the front-rear direction LD from the waist circumference T of the front body F to the waist circumference T of the rear body B through the crotch portion, and the waist circumference T and the rear of the front body F. It is assumed that the leg circumference forming portion L between the body B and the waist circumference portion T has a constricted portion 29 whose width becomes narrower continuously or stepwise toward the middle of the anteroposterior direction LD of the leg circumference forming portion L. It has become. That is, the planar shape of the exterior body 20 in the illustrated form is substantially an hourglass shape as a whole due to the concave leg circumference lines formed to form the leg openings on both side portions. As long as it has a ring-shaped continuous waist circumference T, although not shown, it constitutes a front exterior body 20 constituting a portion including the waist circumference T of the front body F and a portion including the waist circumference T of the rear body B. The rear exterior body 20 may be separately provided at the crotch portion so as to be separated from each other in the front-rear direction LD.

As shown in FIGS. 4 to 6, the exterior body 20 is composed of a first sheet 20A and a second sheet 20B (that is, in this form, the second sheet forms the outer surface of the article), which are made of a non-woven fabric or the like, respectively. It is a non-woven fabric sheet with a layered structure, and various elastic members 24 to 28 are formed between the first sheet 20A and the second sheet 20B, and between the non-woven fabrics of the folded-back portion 20C formed by folding the second sheet 20B inward at the waist opening edge. Are arranged to form a stretchable region. In the illustrated form, an elongated elastic member such as rubber thread is provided as the elastic member, but a net-like or film-like elastic member can also be used.

The first sheet 20A and the second sheet 20B are each composed of one base material, and one or both of them may be a laminate formed by laminating a plurality of base materials such as non-woven fabrics. ..

In the exterior body 20 of the illustrated form, as elastic members, in the developed shape shown in FIGS. 1 to 3, a waist elastic member 24 arranged near the waist opening 23 of the waist circumference T and the waist elastic member 24 The waist circumference portion T and the leg circumference forming portion L on the crotch side of the region having a plurality of waist circumference elastic members 25, 27 arranged along the width direction WD at intervals in the vertical direction, and a predecessor. In the body F and the back body B, apart from the elastic member groups 25 and 27 around the waist, one side seal portion 21 is directed toward the crotch portion along one leg opening, crosses the crotch portion, and is the other. It includes a plurality of curved elastic members 26, 28 that are curved and extend along the leg opening to the other side seal portion 21 and are arranged at intervals without intersecting each other. Each of these elastic members 24 to 28 is fixed in a state of being stretched at a predetermined stretching rate along the extending direction thereof. The exterior body 20 is not provided with a so-called leg-surrounding elastic member that is continuous from the side seal portion of the front body F to the side seal portion of the rear body B along the leg circumference line.

The waist elastic member 24 is made of a plurality of rubber threads or the like arranged at intervals in the vertical direction in the vicinity of the waist opening edge within the range of the side seal portion 21 in which the front body F and the back body B are joined. It is an elongated elastic member, and is for attaching a diaper to the body by applying an elastic force so as to tighten around the waist of the body. Two or more, preferably five or more, waist elastic members 24 are arranged at intervals of 2 to 10 mm, preferably about 4 to 7 mm so as to form a fitting elastic portion having a certain width. As the waist elastic member 24, a tape-shaped member may be used in addition to a thread-shaped one. Further, the waist elastic member 24 of the illustrated embodiment is sandwiched between the non-woven fabrics of the folded portion 20C of the second sheet 20B at the waist, but may be sandwiched between the first sheet 20A and the second sheet 20B. good.

The waistline elastic members 25 and 27 are elongated elastic members such as rubber threads arranged at intervals in the vertical direction on the crotch side from the region having the waist elastic member 24. The one 25 arranged and the one 27 arranged in the leg circumference forming portion L are provided. The waist circumference elastic members 25 and 27 are for applying elastic force in the width direction WD to the waist circumference portion T and the leg circumference forming portion L of the front body F and the back body B, respectively, to bring the diaper into close contact with the body. The waist circumference elastic members 25 and 27 are arranged at intervals of 2 to 15 mm, preferably about 5 to 10 mm, and 20 or more, preferably 40 or more so as to form a stretchable portion for fitting having a certain width. To. The boundary between the waist elastic member 24 and the waist elastic member 25 is most likely to change when the stretching stress in the width direction changes in the waist circumference T (for example, the thickness and elongation rate of the elastic member change). It becomes the boundary of the change on the waist opening side, and if there is no such boundary, the edge of the absorber 13 or the interior body 10 on the waist opening side becomes the boundary.

In the back body B, the dorsal curved elastic member 26 arranged separately from the waist circumference elastic member 25 is an elongated elastic member such as rubber thread, and is arranged along a predetermined curve. The dorsal curved elastic member 26 may be one, but is preferably a plurality, and in the illustrated example, it is an elongated elastic member such as five rubber threads, and these dorsal curved elastic members 26 are mutually exclusive. They are arranged at intervals without intersecting. The dorsal curved elastic member group 26 does not substantially arrange a few elastic members as a bundle at close intervals, but forms a stretchable portion for fitting having a certain width. Three or more, preferably five or more, are arranged at intervals of about 3 to 20 mm, preferably about 6 to 16 mm.

In the front body F of the exterior body 20, the ventral curved elastic member 28 disposed separately from the waist circumference elastic member 25 is an elongated elastic member such as rubber thread, and is arranged along a predetermined curve. The ventral curved elastic member 28 may be one, but is preferably a plurality, and in the illustrated example, there are five filamentous elastic members, and these ventral curved elastic members 28 do not intersect with each other. , Are arranged at intervals. The ventral curved elastic member group 28 is not substantially arranged as a bundle with a few elastic members closely spaced so as to form a stretchable portion for fitting having a certain width. Three or more, preferably five or more, are arranged at intervals of about 3 to 20 mm, preferably about 6 to 16 mm.

In the illustrated example, the waistline elastic members 25, 27 and the curved elastic members 26, 28 arranged on the front body F and the back body B are continuous with respect to the exterior body 20 at the time of manufacture, as shown in FIG. After fixing to, a part or all of the part overlapping with the interior body 10 is finely cut by a predetermined cutting pattern CP, and the non-stretchable region (that is, the part overlapping with the cutting pattern CP in FIG. 3) and the contraction force does not act. The stretchable region on the side of the non-stretchable region is the stretchable region on which the contraction force acts (that is, the elastic members 25, 27 around the waist and the curved elastic members 26, 28 on the side of the cutting pattern CP in FIG. 3 are continuous. The part left in). Therefore, the waistline elastic members 25, 27 and the curved elastic members 26, 28 are continuously provided from the side seal portion 21 on one side to the side seal portion 21 on the other (opposite) side across the interior body 10. , It is cut into small pieces at many places where it overlaps with the interior body 10, or it is cut at one place. Thereby, the shrinkage of the WD in the width direction of the interior body 10 (particularly the absorber 13) can be further prevented. Of course, the waistline elastic members 25, 27 and the curved elastic members 26, 28 can be continuously arranged across the interior body 10.

The exterior body 20 described above can be manufactured by, for example, the techniques described in JP-A-4-28363 and JP-A-11-332913. Further, in order to cut the curved elastic members 26 and 28 on the interior body 10 to make them discontinuous, it is described in JP-A-2002-35029, JP-A-2002-178428 and JP-A-2002-273808. The cutting method is preferably adopted.

Unlike the illustrated example, the curved elastic members 26 and 28 may be provided only on one of the front body F and the back body B, or both may be omitted. When the curved elastic members 26 and 28 are provided on both the front body F and the rear body B, a part or all of the group of curved elastic members arranged on the front body F side and the curved elastic members 26 and 28 are arranged on the back body B side. A form in which a part or all of the curved elastic member B intersects (not shown) can also be adopted, but as shown in the illustrated example, the group of the curved elastic member 28 arranged on the front body F side and the rear It is preferable that the group of curved elastic members B arranged on the body B side is vertically separated from the group of curved elastic members B at a position slightly biased toward the middle portion of the front-rear LD, particularly the front body F, without intersecting with each other. The minimum vertical separation distance in the vertical separation range is about 10 to 15 mm, and it is preferable to provide a wide fixed region described later in this portion.

Further, the curved elastic members 26 and 28 do not have to be curved as a whole, and may have a partially linear portion.

The elongation rate of the elastic members 24 to 28 at the time of fixing can be appropriately determined, but in the case of a normal adult, the waist elastic member 24 is about 230 to 320%, and the waistline elastic member 25 is about 230 to 320%. The curved elastic members 26 and 28 can be about 230 to 320%.

(Wide area)
Characteristically, the portions of the interior body 10 that overlap each of the waist circumference T of the front body F and the waist circumference T of the rear body B are formed in a plurality of width direction ranges 17 located at intervals in the width direction WD. , Each of which has a joint portion 30 joined to the exterior body 20, and the region between these joint portions 30 and the corresponding width direction range 17 is not joined to the exterior body 20, and the width can be expanded. There is a widening area 18. Further, the exterior body 20 has an elastic region that elastically expands and contracts in the width direction WD by the elastic member 25 around the waist in the region where the waist circumference T and the widening region 18 overlap. In the pants-type disposable diaper configured in this way, when the legs are passed through the leg opening, almost no force is applied in the direction of expanding the waist circumference T, so that the waist circumference is as shown in FIGS. 10 and 11. The expansion / contraction region of T is not extended in the width direction WD, and the widening region 18 is also not expanded in the width direction WD. That is, the interior body 10 is in the state of the minimum width. When the pants-type disposable diaper is pulled up from this state and brought to the wearing state, as shown in FIGS. 12 and 13, a force in the direction of expanding the waist circumference T is applied, so that the expansion / contraction region extends in the width direction WD. Along with this, the widening area 18 is also expanded, and the width of the interior body 10 is expanded. Therefore, when passing the legs, the width of the interior body 10 is narrow, so that the legs are less likely to be caught in the crotch portion, and after mounting, the width of the interior body 10 is expanded to firmly fit the base of the inner thigh in the crotch portion. Can be done. Moreover, the width of the interior body 10 is expanded by the elastic force, and the elastic force acts in the direction of maintaining the width after the expansion, so that good fit is maintained. In particular, in this form, the width of the interior body 10 is automatically changed according to the waist circumference dimension, which is a guideline for the size of the wearer's body, so that the fit is improved.

As long as the width of the widening region 18 of the interior body 10 can be expanded, the structure thereof is not particularly limited, such as a structure in which the material itself of the interior body 10 can be extended in the width direction WD. In the state of natural length, the widening region 18 of the illustrated form is a folded portion in which both side portions of the width direction WD are folded back in the width direction WD as shown in FIGS. 10 and 11. As shown in FIG. 13, it has a structure in which the width of the widening region 18 is expanded by expanding the folded portion. With such a structure, it is possible to form a widening region 18 having a large expansion / contraction change by a method known in the present art without using a special elastic material or a special elastic structure. The folded portion preferably has a structure in which the folded portion is folded back to the front side a plurality of times as shown in the figure, but a structure in which the folded portion is folded back a plurality of times is also possible.

Even if the absorber 13 is provided up to both sides of the interior body 10, it is provided only in the middle portion of the interior body 10 in the width direction WD, and has portions on both sides without the absorber 13. May be good. A plurality of absorbers 13 may be provided. When the widening region 18 has a folded structure as shown in the illustrated form, it is one preferable form that a plurality of absorbers 13 are arranged in the width direction WD and the position between the adjacent absorbers 13 is the folded position. is there. Although not shown, the absorber 13 may be provided so as to straddle the folding position, and a portion for facilitating folding such as a slit or embossing along the LD in the front-rear direction may be provided at the folding position of the absorber 13.

In the illustrated embodiment, the number of the widening regions 18 is two on both sides of the WD in the width direction of the interior body 10, but it can be three or more. The dimensions of the widening region can be appropriately determined, but when there are two widening regions as shown in the figure, for example, the width of each widening region before expansion is about 20.0 to 60.0 mm, and after maximum widening. The width of the state can be about 40.0 to 120.0 mm.

Since the joints 30 are provided on both sides of the widening region 18 in the width direction WD, the number and positions of the joints 30 can be determined according to the number of the widening regions 18 to this extent. In the form shown in FIGS. 10 to 13, a joint portion 30 covering the entire front-rear direction LD is provided at the center of the width direction WD of the interior body 10, and front-rear end portions are provided at both ends of the width-direction WD of the interior body 10. A joint portion 30 is provided only on the joint portion 30, and a widening region 18 is provided between the joint portion 30 and the corresponding width direction range 17. Further, in the form shown in FIGS. 14 to 17, which will be described later, in the portion where the interior body 10 and the elastic band 40 overlap, only both ends of the WD in the width direction are formed, and the exterior body 20 is used instead of the interior body 10 and the elastic band 40. In the overlapping portion, the joint portion 30 is provided only in the central portion in the width direction WD. In this way, as long as the widening region 18 can be widened, an appropriate portion of the interior body 10 can be fixed to the exterior body 20 in order to reliably support the interior body 10 with respect to the exterior body 20.

The width of the joint may be appropriately determined, but it is usually preferably about 5.0 to 150.0 mm.

If the change in the crotch width of the interior body 10 is too small or too large, either or both of the ease of wearing and the fit of the crotch portion may be insufficient. Therefore, in a normal case, the crotch width C1 of the interior body 10 in an unused natural length state is 0.4 to 0 of the crotch width C2 of the interior body 10 when the exterior body 20 is maximally extended in the width direction WD. It is preferably 7.7 times.

As shown in the illustrated figure, the exterior body 20 integrally extends in the front-rear direction LD from the waist circumference T of the front body F to the waist circumference T of the rear body B through the crotch portion, and the waist circumference portion of the front body F. The leg circumference forming portion L between the T and the waist circumference portion T of the back body B is provided with a constricted portion 29 whose width is continuously or gradually narrowed toward the middle of the anteroposterior direction LD of the leg circumference forming portion L. It is preferable to have it because it has a structure in which the crotch portion is firmly supported by the exterior body 20. In this case, in the unused natural length state, the crotch width of the interior body 10 is the same as or narrower than the crotch width of the exterior body 20 (the form shown in FIG. 10 is the same and equal to C1), and the exterior body 20 When the waist circumference T is extended 1.2 times or more in the width direction WD, the crotch width of the interior body 10 (equal to C2 in the form shown in FIG. 12) is wider than the crotch width of the exterior body 20. If there is, the crotch width C1 of the interior body 10 is made narrower than the crotch width of the exterior body 20 to maximize the ease of passing the legs when passing the legs, and the crotch width C2 of the interior body 10 is set to the exterior body when wearing. It is preferable because it can be made wider than the crotch width of 20 to improve the fit to the base of the inner thigh.

On the other hand, as shown in FIGS. 14 to 17, both the front body F and the back body B pass between the waist circumference T and the interior body 10, and both sides of the WD in the width direction from both side edges of the interior body 10. It is also proposed to provide elastic bands 40 that elastically expand and contract in the width direction WD, and to use the elastic bands 40 to expand the width of the interior body 10. That is, in this form, both ends 42 of the elastic band 40 are fixed to the exterior body 20, and the portion between both ends 42 of the elastic band 40 is not fixed to the exterior body 20. Further, the portion of the interior body 10 that overlaps with the elastic band 40 has a joint portion 30 joined to the elastic band 40 in a plurality of width direction ranges 17 located at intervals in the width direction WD. The region between the joint portion 30 and the corresponding width direction range 17 is not joined to the exterior body 20 and the elastic band 40, but is a widening region 18 whose width can be expanded, and the elastic band 40 has a width. A perforation 41 for cutting itself is provided between the joints 30 adjacent to the direction WD. Further, the exterior body 20 has an elastic region that elastically expands and contracts in the width direction WD by the elastic member 25 around the waist in the region where the waist circumference T and the widening region 18 overlap.

In the form having the elastic band 40, when the leg is passed through the leg opening, almost no force is applied in the direction of expanding the waist circumference portion T. Therefore, as shown in FIGS. 14 and 15, the waist circumference portion T expands and contracts. The region and the elastic band 40 do not extend in the width direction WD, and the widening region 18 also does not extend in the width direction WD. That is, the interior body 10 is in the state of the minimum width. When the pants-type disposable diaper is pulled up from this state and brought to the wearing state, as shown in FIGS. 16 and 17, a force in the direction of expanding the waist circumference T is applied, and the elastic region and the elastic band 40 become WD in the width direction. It extends and the elastic band 40 is automatically cut at the perforation 41. With the division of the elastic band 40, the contraction force of the elastic band 40 acts to attract the joint portion 30 of the interior body 10 toward the fixed portion 42 side of the exterior body 20, so that the widening region 18 of the interior body 10 is formed. It expands and the width of the interior body 10 expands. Therefore, when passing the legs, the width of the interior body 10 is narrow, so that the legs are less likely to be caught in the crotch portion, and after mounting, the width of the interior body 10 is expanded to firmly fit the base of the inner thigh in the crotch portion. Can be done. Moreover, the width of the interior body 10 is expanded by the elastic force, and the elastic force acts in the direction of maintaining the width after the expansion, so that good fit is maintained. Then, in the form having the elastic band 40, unlike the above-mentioned form in which the width of the interior body 10 is expanded by utilizing the elasticity of the exterior body 20, the elastic band 40 for expanding the width of the interior body 10 is added. The width of the interior body 10 can be expanded independently without affecting the elasticity of the exterior body 20, and the fit of the exterior body 20 and the fit of the interior body 10 can be set independently. it can.

As the elastic band 40, in addition to the elastic material itself such as a rubber sheet, a sheet in which a sheet such as a non-woven fabric is laminated and an elastic member such as a thread rubber is interposed between the layers (a structure similar to that of the exterior body 20) is used. Can be used.

Others are the same as those having no elastic band 40, and thus the description thereof will be omitted.

<Explanation of terms in the specification>
When the following terms are used in the specification, they have the following meanings unless otherwise specified in the specification.
-The "front-back (vertical) direction" means the direction connecting the ventral side (front side) and the dorsal side (rear side), and the "width direction" means the direction orthogonal to the front-back direction (horizontal direction).
-"Unfolded state" means a state in which the unfolded state is flat without shrinkage or slack.
-"Elongation rate" means a value when the natural length is 100%.
-If there is no description about the environmental conditions in the test or measurement, the test or measurement shall be performed in a test room or equipment under standard conditions (test location: temperature 20 ± 5 ° C, relative humidity 65% or less). ..
-Unless otherwise specified, the dimensions of each part mean the dimensions in the unfolded state, not in the natural length state.

The present invention can be used for pants-type disposable diapers.

B ... back body, F ... front body, L ... leg circumference forming part, LD ... front and back direction, T ... waist circumference, WD ... width direction, 10 ... interior body, 11 ... top sheet, 12 ... liquid permeable sheet , 13 ... Absorber, 14 ... Packaging sheet, 15 ... Gathered sheet, 16 ... Gathered elastic member, 17 ... Width direction range, 18 ... Widening area, 20 ... Exterior body, 20C ... Folded part, 21 ... Side seal part, 24 ... Waist elastic member, 25, 27 ... Waist elastic member, 26 ... Dorsal curved elastic member, 28 ... Ventral curved elastic member, 29 ... Constriction, 30 ... Joint, 40 ... Elastic band, 41 ... Perforation ..

Claims (4)

An exterior body with a ring-shaped continuous waist circumference and
An interior body including an absorber that extends from the middle of the waist circumference of the front body in the width direction, through the crotch part, to the middle of the waist circumference of the back body in the width direction.
In a pants-type disposable diaper with a waist opening and a pair of left and right leg openings.
Both the front body and the back body have elastic bands that elastically expand and contract in the width direction, passing between the waist circumference and the interior body and extending on both sides in the width direction from both side edges of the interior body. Ori,
Both ends of the elastic band are fixed to the exterior body, and the portion between both ends of the elastic band is not fixed to the exterior body.
The portion of the interior body that overlaps with the elastic band has joint portions joined to the elastic band in a plurality of width direction ranges located at intervals in the width direction.
The region between the width direction ranges in the interior body is not joined to the exterior body and the elastic band, and is a widening region in which the width can be expanded.
The elastic band has a perforation for cutting itself between the joints adjacent to each other in the width direction.
The exterior body has an elastic region that elastically expands and contracts in the width direction in a region where the waist circumference portion and the widening region overlap.
Pants-type disposable diapers that feature this. 1. The crotch width of the interior body in an unused natural length state is 0.4 to 0.7 times the crotch width of the interior body when the exterior body is maximally extended in the width direction. Pants type disposable diapers listed. An exterior body with a ring-shaped continuous waist circumference and
An interior body including an absorber that extends from the middle of the waist circumference of the front body in the width direction, through the crotch part, to the middle of the waist circumference of the back body in the width direction.
In a pants-type disposable diaper with a waist opening and a pair of left and right leg openings.
The portions of the interior body that overlap each of the waist circumference portion of the front body and the waist circumference portion of the rear body are joined to the exterior body in a plurality of width direction ranges located at intervals in the width direction. Have each
The region between the width direction ranges in the interior body is not joined to the exterior body and is a widening region in which the width can be expanded.
The exterior body has a stretchable region that elastically expands and contracts in the width direction in a region where the waist circumference portion and the widened region overlap.
The exterior body extends integrally in the front-rear direction from the waist circumference of the front body through the crotch to the waist circumference of the back body, and the legs between the waist circumference of the front body and the waist circumference of the back body. The circumference forming portion has a constricted portion whose width becomes narrower continuously or stepwise toward the middle in the anteroposterior direction of the leg circumference forming portion.
In the unused natural length state, the crotch width of the interior body is the same as or narrower than the crotch width of the exterior body.
When the waist circumference of the exterior body is extended 1.2 times or more in the width direction, the crotch width of the interior body becomes wider than the crotch width of the exterior body.
Pants-type disposable diapers that feature this . An exterior body with a ring-shaped continuous waist circumference and
An interior body including an absorber that extends from the middle of the waist circumference of the front body in the width direction, through the crotch part, to the middle of the waist circumference of the back body in the width direction.
In a pants-type disposable diaper with a waist opening and a pair of left and right leg openings.
The portions of the interior body that overlap each of the waist circumference portion of the front body and the waist circumference portion of the rear body are joined to the exterior body in a plurality of width direction ranges located at intervals in the width direction. Have each
The region between the width direction ranges in the interior body is not joined to the exterior body and is a widening region in which the width can be expanded.
The exterior body has a stretchable region that elastically expands and contracts in the width direction in a region where the waist circumference portion and the widened region overlap.
In the natural length state, the widening region is a folded portion in which both side portions in the width direction are folded back in the width direction, and the width of the widening region is expanded by expanding the folded portion.
Pants-type disposable diapers that feature this .

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