JP6842893B2 - Pants type disposable diapers - Google Patents

Description

The present invention relates to a pants-type disposable diaper in which the crushing of a diffusion groove formed in an absorber in the front-rear direction is suppressed.

Pants-type disposable diapers have a waist opening and a pair of leg openings, and an exterior body extending from the edge of the front waist opening to the edge of the rear waist opening, and an absorber provided at least in the crotch part of this exterior body. A structure having an interior body including the above and side seal portions for joining both front side portions and rear side side portions of the exterior body is common.

Further, as one form of the pants type disposable diaper, a trunks type (also called a one-quarter length shape or a boxer type) disposable diaper having a pair of leg cylinders surrounding the base side of the thigh is also known. As a trunks type disposable diaper with a simple leg tube structure, the crotch part of the exterior body has a pair of inner thigh contact parts extending to one side and the other side in the width direction from the circumscribing rectangle of the absorber. , It is known that a portion along the edge of the leg opening including these inner thigh contact portions is a pair of leg tube portions surrounding the base side of the thigh (see, for example, Patent Documents 1 to 5).

In pants-type disposable diapers, various elastic members are fixed to the exterior body in an extended state in order to improve the fit to the body. For example, in the waist circumference region corresponding to the side seal portion, in addition to the elongated waist elastic member and the lower waist elastic member provided in the waist portion and the lower waist portion along the width direction, one of the front and rear sides of the exterior body. Attached in a pattern from the side seal of the leg to the center of the width along the edge of the leg opening, across the center of the width to the other leg opening, and along the other leg opening to the other side seal. In addition, the elastic members around the front legs and the elastic members around the rear legs are indispensable for improving the fit of the pants-type disposable diaper.

However, if an elastic member is provided so as to cross the joint region of the interior body in the exterior body, the absorber contracts in the width direction, so that irregular irregularities are formed on the absorber body, which causes stiffness and leakage. At present, the joint region of the interior body is generally a non-stretchable region.

On the other hand, in the pants-type disposable diaper, as with other absorbent articles, a diffusion groove extending in the front-rear direction is provided in the middle of the width direction of the absorber. Since the diffusion groove diffuses the urine excreted in the crotch in the anterior-posterior direction, it is usually on both sides of the anterior-posterior region rather than the intermediate region which is the region between the edge of one leg opening and the edge of the other leg opening. Extends to.

However, since the intermediate region is a portion sandwiched between the wearer's legs, the diffusion groove provided in the absorber at the time of wearing may be crushed by the compression action toward the center side in the width direction, and the original diffusion performance may not be exhibited. there were.

Japanese Unexamined Patent Publication No. 2006-230920 Japanese Unexamined Patent Publication No. 2007-061335 Japanese Unexamined Patent Publication No. 2010-821333 Japanese Unexamined Patent Publication No. 2010-227505 Japanese Patent No. 5208965 Japanese Patent No. 4439150

Therefore, a main object of the present invention is to provide a pants-type disposable diaper in which the crushing of the diffusion groove formed in the absorber in the front-rear direction is suppressed.

A typical aspect of the present invention that solves the above problems is as follows.
<First aspect>
An exterior body having a waist opening and a pair of leg openings extending from the edge of the front waist opening to the edge of the rear waist opening, and an interior body including an absorber provided at least in the crotch portion of the exterior body. It has a side seal portion that joins both front side portions and rear side side portions of the exterior body.
On at least one side of the front and rear of the exterior body, from one side seal portion toward the center in the width direction along the edge of the leg opening, across the center in the width direction toward the other leg opening, the other It has one or a plurality of elongated leg-surrounding elastic members that are attached in a pattern along the edge of the leg opening to the other side seal portion and do not intersect with each other.
The absorber has diffusion grooves extending on both front and rear sides of an intermediate region, which is a region between the edge of one leg opening and the edge of the other leg opening.
In pants-type disposable diapers
The leg-surrounding elastic member is continuous from the side seal portions on both sides in the width direction to at least the portion overlapping the side portion of the absorber, and is cut at the portion overlapping the diffusion groove, and the diffusion groove in the exterior body is cut. The part that overlaps with is a non-stretchable area,
Pants-type disposable diapers that feature this.

(Action effect)
According to this aspect, the contraction force of the elastic member around the leg acts to widen the diffusion groove on both sides in the width direction, and the portion overlapping the diffusion groove is a non-stretchable region, so that the elastic member does not collapse. , The crushing of the diffusion groove will be effectively suppressed. It is also conceivable to use other elastic members, for example, an elongated waist elastic member and a waist lower elastic member provided in the waist portion and the lower waist portion, which will be described later, arranged in a straight line along the width direction. Since the elastic member in the waist circumference region corresponding to the side seal portion does not pass through the intermediate region, it is not possible to prevent the diffusion groove from being crushed in the intermediate region which is the portion sandwiched between the legs. In addition, an elastic member at the lower part of the waist may be provided in the intermediate region, but since one end of this elastic member at the lower part of the waist is located at the leg opening instead of the side seal portion, even if this is used, the diffusion groove is crushed. It cannot be suppressed.

<Second aspect>
The crotch portion of the exterior body has a pair of inner thigh contact portions extending in one side and the other side in the width direction with respect to the circumscribing rectangle of the absorber, and the leg opening including these inner thigh contact portions. A trunks type disposable diaper whose part along the edge is a pair of leg cylinders that surround the base of the thigh.
The pants-type disposable diaper of the first aspect.

(Action effect)
In particular, in the case of an elastic member around the leg in a trunks type disposable diaper as in this embodiment, the angle between the contraction direction and the width direction becomes shallow, so that the width component of the contraction force becomes large, and the crushing of the diffusion groove is more effective. Can be prevented.

<Third aspect>
As the leg-surrounding elastic member, on the front side of the exterior body, from one side seal portion toward the center in the width direction along the edge of the leg opening, and across the center in the width direction toward the other leg opening. It has one or a plurality of elongated front leg elastic members that are attached in a pattern along the edge of the other leg opening to the other side seal.
As the leg-surrounding elastic member, on the rear side of the exterior body, one side seal portion is directed toward the center in the width direction along the edge of the leg opening, and crosses the center in the width direction to the other leg opening. It has one or more elongated hind leg elastic members that face each other and are attached in a pattern that extends along the edge of the other leg opening to the other side seal.
The front leg elastic member and the rear leg elastic member are attached in a pattern in which at least one of the front leg elastic members and at least one of the rear leg elastic members intersect on both sides in the width direction of the intermediate region. Has been
Pants-type disposable diaper according to the first or second aspect.

(Action effect)
When the elastic member around the front leg and the elasticity around the rear leg are provided in such a pattern and the contraction forces of both are combined to act to widen the diffusion groove on both sides in the width direction, the effect of preventing the diffusion groove from being crushed is further enhanced. It becomes.

<Fourth aspect>
The elastic members around the front legs and the elastic members around the rear legs are provided in a front-rear symmetrical arrangement with respect to the number and arrangement thereof.
The pants-type disposable diaper of the third aspect.

(Action effect)
Due to such an anteroposterior symmetrical arrangement, the vertical components of the contraction force of the elastic member around the front leg and the elastic member around the rear leg cancel each other out, so that the force in the width direction acts on both sides of the slit in the absorber in a particularly well-balanced manner. , The effect of preventing the slit from being crushed is further enhanced.

As described above, according to the present invention, there are advantages such as a pants-type disposable diaper in which the crushing of the diffusion groove extending in the front-rear direction formed on the absorber is suppressed.

It is a plan view (inner surface side) of a trunks type disposable diaper in an unfolded state. It is a plan view (outer surface side) of a trunks type disposable diaper in an unfolded state. It is a top view of the interior body. It is a cross-sectional view of 4-4 of FIG. It is a cross-sectional view of 2-2 of FIG. It is a cross-sectional view of 3-3 of FIG. It is a perspective view seen from the front diagonally lower side with the trunks type disposable diaper attached. It is a top view which shows the cut pattern of an elastic member. It is a top view which shows the adhesive application pattern. It is an enlarged plan view of the main part of FIG. It is an enlarged plan view of the main part of another form. It is a top view which shows the other pattern of the elastic member around a leg. It is an enlarged view of the main part of FIG. It is an enlarged view of the main part of FIG. 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 plan view (outer surface side) of a trunks type disposable diaper in an unfolded state. It is an enlarged plan view of the main part of a trunks type disposable diaper in an unfolded state.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings. The term "elongation rate" means a value when the natural length is 100%. In addition, the dotted pattern portion in the figure indicates a joining means such as a hot melt adhesive.
1 to 10 show trunks type disposable diapers. This trunks type disposable diaper (hereinafter, also simply referred to as a diaper) has a waist opening and a pair of leg openings, and has an exterior body 20 extending from the edge of the waist opening of the front body F to the edge of the waist opening of the back body B. The exterior body 20 has an interior body 10 including an absorber 13 provided at least in the crotch portion 28, and side seal portions 21 for joining both front side portions and rear side side portions of the exterior body 20. is there. Further, the crotch portion 28 of the exterior body 20 means an circumscribing rectangle of the absorber 13 (meaning a virtual rectangle circumscribing the absorber 13 in a plan view in a deployed state, and in this embodiment, one opposite side of the circumscribing rectangle of the absorber 13. Has a pair of inner thigh contact portions 31 extending in one side and the other side in the width direction, respectively, and includes the inner thigh contact portions 31, the edge 29 of the leg opening. The portion along the line is a pair of leg rectangles 30 that surround the base side of the thigh. In manufacturing, after the interior body 10 is joined to the exterior body 20 by a joining means such as a hot melt adhesive, the interior body 10 and the exterior body 20 are in the front-rear direction (front and rear direction) which is the boundary between the front body F and the back body B. Trunks type in which a waist opening and a pair of leg openings are formed by folding at the center (vertical direction) and joining both sides to each other by heat welding or hot melt adhesive to form a side seal portion 21. It becomes a disposable diaper.

(Example of interior structure)
As shown in FIGS. 3 to 6, the interior body 10 has an absorber 13 interposed between a liquid-permeable top sheet 11 made of a non-woven fabric or the like and a liquid-impermeable sheet 12 made of polyethylene or the like. It has a structure and absorbs and retains the excrement liquid that has passed through the top 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 top sheet 11 that covers the front side of the absorber 13 and forms the skin contact surface, 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 surface side of the absorber 13, but is not limited to this.

As the liquid-impermeable sheet 12 covering the back side of the absorber 13, a liquid-impermeable plastic sheet such as polyethylene or polypropylene is used, but in recent years, a liquid-impermeable sheet having moisture permeability is preferably used from the viewpoint of preventing stuffiness. The 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. Can be mentioned.

As the liquid-impermeable sheet 12, it is desirable to use an opaque sheet so that brown color such as defecation and urine does not appear. As the opacity, a plastic in which pigments such as calcium carbonate, titanium oxide, zinc oxide, white carbon, clay, talc, and barium sulfate and a filler are added and formed into a film is preferably used. In the illustrated form, the liquid-impermeable sheet 12 is folded back on both sides in the width direction of the absorber 13 together with the top sheet 11, but the present invention is not limited to this.

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.

The overall shape of the absorber 13 is formed in a substantially hourglass shape having a constricted portion 13N narrower than both front and rear sides in the front-rear direction range including the crotch portion 28, but the overall shape should be an appropriate shape such as a rectangular shape. Can be done. The dimensions of the constricted portion 13N can be appropriately determined, but the length of the constricted portion 13N in the front-rear direction can be about 20 to 50% of the total length of the diaper, and the width of the narrowest portion 13 m is the total width of the absorber 13. It can be about 40 to 60%. In the case of having such a constricted portion 13N, if the planar shape of the interior body 10 is substantially rectangular, the portion of the interior body 10 corresponding to the constricted portion 13N of the absorber 13 does not have the absorber 13. A part is formed.

As shown in FIGS. 1 and 3 to 5, it is preferable that the absorber 13 has a diffusion groove 17 extending in the anteroposterior direction in the middle portion in the width direction because the diffusibility of urine in the anterior-posterior direction is improved. From the point of view of urine diffusivity, the diffusive groove extends anteriorly and bilaterally from the intermediate region, which is the region between the edge of one leg opening and the edge of the other leg opening. Only one diffusion groove 17 may be provided at the center in the width direction, but two diffusion grooves 17 may be provided at intervals in the width direction. Although the diffusion groove 17 extends linearly in the illustrated embodiment, it may extend in a curved shape.

The diffusion groove 17 is preferably a slit that penetrates the absorber 13 in the thickness direction as shown in the figure, but may be a recess provided on at least one of the front and back sides of the absorber 13 that does not penetrate in the thickness direction. .. When the recess is formed in the absorber 13, it can be formed by reducing the basis weight of the recess formation position from the surroundings, or by compressing the recess formation position by embossing.

The position of the diffusion groove forming region is not limited as long as it is provided in the middle portion in the width direction of the absorber 13, but the center in the width direction is usually desirable, and the width (in the case of one, the width 17d of the diffusion groove) is absorbed. It is desirable that the total width of the body 13 is 5 to 20% of the total width of 13w. Further, the length 17L of the diffusion groove 17 in the front-rear direction can be appropriately determined, and can be, for example, about 30 to 70% of the total length of the absorber 13.

Three-dimensional gather BSs that fit around the legs are formed on both sides of the interior body 10. As shown in FIGS. 5 and 6, the three-dimensional gather BS has a fixed portion fixed to the side portion of the back surface of the interior body 10, and the surface of the interior body 10 from this fixed portion via the side of the interior body 10. The main body portion extending to the side portion of the main body, the inverted portion formed by fixing the front and rear ends of the main body portion to the side portion of the surface of the interior body 10 in an inverted state, and the portion of this inverted portion are not fixed. The formed free portion is formed by a gather sheet 15 that is doubled by folding back. As the gather sheet 15, a non-woven fabric having water repellency is preferably used.

Further, between the double gather sheets 15, an elongated gather elastic member 16 is arranged at the tip of a free portion or the like. The gather elastic member 16 is for forming a three-dimensional gather BS by erecting a free portion by an elastic elastic force as shown by a two-dot chain line in FIG. 5 in a product state.

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 of the thickness at 925 dtex or less, the elongation rate 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 may be used in addition to the thread-shaped member as shown in the illustrated figure.

The non-woven fabric used for the gather sheet 15 is not particularly limited, and is composed of olefin-based fibers such as polyethylene or polypropylene, synthetic fibers such as polyester-based and amide-based fibers, recycled fibers such as rayon and cupra, and natural fibers such as cotton. It can also be produced by an appropriate processing method such as a spunbond method, a thermal bond method, a melt blown method, or a needle punch method. In particular, as the gather sheet 15, it is desirable to use a water-repellent treated non-woven fabric coated with a silicone-based, paraffin metal-based, alkylchromic chloride-based water repellent, or the like in order to prevent permeation of urine or the like.

(Structural example of exterior body)
As shown in FIG. 4, the exterior body 20 is provided with various elastic members 24 to 27 for imparting elasticity, and at least a region having the elastic members (the entire region in the illustrated form) is provided. It has a plurality of sheet layers, and elastic members 24 to 27 are sandwiched between these sheet layers. The plurality of sheet layers can be formed by one sheet material each, or by folding back one sheet material. The exterior body 20 of the illustrated embodiment has a two-layer structure composed of a pressing sheet 20A and a back sheet 20B made of a non-woven fabric or the like, respectively, and the pressing sheet 20A and the back sheet 20B and the back sheet 20B on the inner surface side at the waist opening edge. Various elastic members 24 to 27 are arranged between the non-woven fabrics of the folded portion 20C which is folded back to provide elasticity.

The exterior body 20 has a substantially hourglass shape in which the middle of the LD in the front-rear direction is constricted, and both side edges of the constriction are edges 29 of the leg openings, respectively. As described above, the crotch portion 22 of the exterior body 20 has a pair of inner thigh contact portions 31 extending to one side and the other side of the WD in the width direction from the circumscribing rectangle of the absorber 13. A portion along the edge 29 of the leg opening, including the inner thigh contact portion 31, becomes a pair of leg tube portions 30 surrounding the base side of the thigh. The dimensions of the inner thigh contact portion 31 may be appropriately determined according to the length of the leg tube portion 30, but usually, the width 31x of the inner thigh contact portion 31 in the narrowest portion of the exterior body 20 is a diaper. It is preferably about 1 to 5% of the total length Y. _{Further, as shown in FIG. 18, in the front body F, the width direction is at an angle θ 1} of 20 degrees with respect to the width direction from the virtual point P1 located on the edge 29 of the leg opening on the most width direction center side. When the virtual straight line L1 toward the outside and the waist side is drawn, it is preferable to have an intersection P2 between this virtual straight line L1 and the side edge of the exterior body 20 in the front-rear direction range having the side seal portion 21, and from this intersection P2. The anteroposterior distance 30f to the edge 29 of the leg opening is preferably the width 31x or more of the inner thigh contact portion 31 in the narrowest portion of the exterior body 20, and is preferably substantially the same. On the other hand, in the back body B, the virtual point P1 located on the edge 29 of the leg opening on the most central side in the width direction is virtual toward the outside and the waist side in the width direction at _{an angle θ 2 of 30 degrees with respect to the width direction.} When the straight line L2 is drawn, it is preferable to have an intersection P3 between this virtual straight line L2 and the side edge of the exterior body 20 in the front-rear direction range having the side seal portion 21, and from this intersection P3 to the edge 29 of the leg opening. The front-rear direction spacing 30b may be equal to or greater than or equal to the width 31x of the inner thigh contact portion 31 in the narrowest portion of the exterior body 20.

In the exterior body 20 of the illustrated embodiment, in each of the front body F and the back body B, the waist elastic member 24 arranged along the width direction WD near the waist opening 23 and the waist elastic member 24 in the width direction toward the leg opening side. The lower waist elastic member 25 arranged along the WD and the side seal portion 21 from one side seal portion 21 toward the center of the WD in the width direction along the edge 29 of the leg opening, cross the center of the WD in the width direction, and reach the other leg opening. A plurality of front leg elastic members 27 and a plurality of front leg elastic members 27 which are arranged so as to face each other and extend along the edge 29 of the other leg opening in a pattern extending to the other side seal portion 21 while being curved and not intersecting with each other. An elastic member 26 around the hind legs is provided. These elastic members 24 to 27 are fixed in a state of being stretched at a predetermined stretching rate along the extending direction thereof, and are stretched together with the exterior body 20 between the stretched state at the time of fixing and the natural length state. It has become. The exterior body 20 is not provided with an elastic member around the legs that is continuous from the side seal portion 21 of the front body F to the side seal portion 21 of the rear body B along the edge 29 of the leg opening.

The waist elastic member 24 includes a plurality of rubber threads or the like arranged at intervals in the vertical direction near the waist opening 23 in the front-rear direction 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 of the above, and is for tightening and fitting the vicinity 23 of the waist opening of the diaper. In the illustrated example, a plurality of rubber threads are used for the waist elastic member 24, but a tape-shaped elastic member may be used instead. Further, although the waist elastic member 24 of the illustrated form is sandwiched between the non-woven fabrics of the folded portion 20C of the back sheet 20B at the waist portion, it may be sandwiched between the pressing sheet 20A and the back sheet 20B.

The waist lower elastic member 25 is an elongated range such as a plurality of thread rubbers arranged at intervals in the vertical direction in the range on the leg opening side of the waist elastic member 24 in the front-rear direction range having the side seal portion 21. It is a shape elastic member, and is for tightening and fitting almost the entire waist area of the diaper except for the vicinity of the waist opening 23. The boundary between the waist elastic member 24 and the waist lower elastic member 25 is at a position where the expansion / contraction characteristics such as the thickness and the elongation rate of the elastic member change, or when the expansion / contraction characteristics do not change, the interior body 10 Located on the waist side edge. It is desirable that the lower waist elastic member 25 is not provided in the crotch portion 28 as shown in the figure, and may be provided on both the front and rear sides of the intermediate region 22 as shown in the figure, but it is not necessary to provide the elastic member 25. ..

In the exterior body 20 of the back body B, the elastic member 26 around the hind legs, which is disposed separately from the elastic member 25 at the lower part of the waist, is an elongated elastic member such as rubber thread, and at least one, preferably a plurality of elastic members are used. It is arranged along a predetermined curve passing through the leg tube portion 30 of the back body B. The number of elastic members 26 around the hind legs may be one, but it is preferable that there are a plurality of elastic members 26 around the hind legs. In the illustrated example, there are five elongated elastic members such as rubber threads, and these elastic members around the hind legs 26 are mutually exclusive. They are arranged at intervals without intersecting. The elastic members around the hind legs 26 groups are not arranged as a bundle with the elastic members closely spaced so as to form a predetermined expansion / contraction zone including the leg tube portion 30 of the rear body B. Three or more, preferably four or more, are arranged at intervals of about 3 to 20 mm, preferably about 6 to 16 mm.

In the exterior body 20 of the front body F, the elastic members 27 around the front legs, which are arranged separately from the elastic member group 25 at the lower part of the waist, are elongated elastic members such as rubber threads, and at least one, preferably a plurality of elastic members is the front body. It is arranged along a predetermined curve passing through the leg tube portion 30 of the roller F. The number of elastic members 27 around the front legs may be one, but it is preferable that there are a plurality of elastic members 27 around the front legs. In the illustrated example, there are five elongated elastic members such as rubber threads, and these elastic members around the front legs intersect with each other. It is arranged at intervals without doing anything. The 27 groups of elastic members around the front legs are also not arranged as a bundle with the elastic members closely spaced so as to form a predetermined expansion / contraction zone including the leg tube portion 30 of the front body F. Three or more, preferably four or more, are arranged at intervals of about 20 mm, preferably about 6 to 16 mm. The number of elastic members around the front legs 27 is preferably the same as the number of elastic members around the rear legs 26, but it may be different if necessary.

The elastic member 27 around the front leg and the elastic member 26 around the rear leg may not be curved as a whole, and may have a partially linear portion. Only one of the elastic member 27 around the front leg and the elastic member 26 around the rear leg may be provided.

As a method of attaching the front leg elastic member 27 and the rear leg elastic member 26, for example, the techniques described in JP-A-4-28363 and JP-A-11-332913 can be adopted.

As shown in FIG. 10, the elastic member 27 around the front leg and the elastic member 26 around the rear leg are both sides in the width direction of the intermediate region 22, which is a region between the edge 29 of one leg opening and the edge 29 of the other leg opening. Therefore, it is preferable that at least one elastic member 27 around the front leg and at least one elastic member 26 around the rear leg are attached in a pattern of intersecting each other. As a result, the elastic member 27 around the front leg and the elastic member 26 around the rear leg intersect and are substantially continuous along the leg opening, and elasticity is added over the entire circumferential direction of the leg tube portion 30. The number of intersections of the front leg elastic member 27 and the rear leg elastic member 26 is one in the front and rear as shown in FIG. 2, and all the front leg elastic members 27 and the rear are as shown in FIG. The elastic members 26 around the legs may intersect each other.

The intersection position C1 of the elastic member 27 around the front leg and the elastic member 26 around the rear leg located on the edge 29 side of the most leg opening is the same as or wider in the width direction WD than the narrowest portion 13 m of the constricted portion 13N. It is one preferable form that the crotch portion 28 is located on the central side of the direction WD and has no elastic member other than the elastic member 27 around the front leg and the elastic member 26 around the rear leg. As a result, the contraction force of the elastic member 27 around the front leg and the elastic member 26 around the rear leg makes it difficult to pull the inner thigh contact portion 31 toward the center side of the width direction WD, and suppresses the shortening of the length of the inner thigh contact portion 31. Therefore, it is possible to prevent deterioration of the wearing feeling and generation of gaps.

In particular, when the distance between the edge 29 of the leg opening and the elastic member closest to the edge 29 of the leg opening is narrow, the intersection position C1 of the elastic member 27 around the front leg and the elastic member 26 around the rear leg becomes close to the edge 29 of the leg opening. It is easy to make it difficult to position the constricted portion 13N in the absorber 13 on the central side of the WD in the width direction rather than the narrowest portion. Therefore, the elastic member 27 around the front leg and the elastic member 26 around the rear leg have a distance 29e between the edge 29 of the leg opening and the elastic member closest to the edge 29 of the leg opening in the direction orthogonal to the tangent line of the edge 29 of the leg opening. It is preferably 10 mm or more, and particularly preferably 10 to 50 mm in the crotch portion 28.

As shown in FIG. 8, the lower waist elastic member 25, the front leg elastic member 27, and the rear leg elastic member 26 are continuously fixed to the exterior body 20 at the time of manufacture, and then are connected to the interior body joint portion 18. Part or all of the overlapping portion becomes a non-stretchable region 19 (that is, a portion that overlaps with the cut pattern CP in FIG. 8) that is finely cut by a predetermined cutting pattern CP and does not expand or contract, and extends laterally from this non-expandable region 19. The existing portion is an elastic region (that is, a portion where the elastic member 25 below the waist, the elastic member 27 around the front leg, and the elastic member 26 around the rear leg are continuously left on the side of the cutting pattern CP in FIG. 8). May be. In this case, the lower waist elastic member 25, the front leg elastic member 27, and the rear leg elastic member 26 are continuous 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. A part or all of the portion overlapping the interior body joint portion 18 is cut into small pieces. This makes it possible to prevent unnecessary contraction of the interior body 10 (particularly the absorber 13) in the width direction.

In particular, in the present embodiment having the diffusion groove 17 in the absorber 13, at least one of the front leg elastic member 27 and the rear leg elastic member 26 has side seals on both sides in the width direction WD, as shown in FIGS. 2 and 10. The portion 21 is continuous from the portion 21 to at least the portion overlapping the side portion of the absorber 13, the portion overlapping the diffusion groove 17 is cut, and the portion overlapping the diffusion groove 17 in the exterior body 20 is a non-stretchable region 19. In particular, as shown in the figure, at least one of the elastic member 27 around the front leg and the elastic member 26 around the rear leg is continuous up to the end on the diffusion groove 17 side in the region between the side edge of the absorber 13 and the diffusion groove 17. It is more preferable that the portion overlapping the diffusion groove 17 is cut, and the portion overlapping the diffusion groove 17 in the exterior body 20 is a non-stretchable region 19. At the time of mounting, the absorber 13 is sandwiched between both legs in the crotch portion 28 to reduce the width, but at least one of the elastic member 27 around the front leg and the elastic member 26 around the rear leg extends to the side portion of the absorber 13 and has a diffusion groove. When the portion overlapping with 17 is cut, the contraction force of the elastic member acts to widen the diffusion groove 17 on both sides in the width direction, and the diffusion groove 17 is prevented from being crushed. In particular, in the case of the elastic member 27 around the front leg and the elastic member 26 around the rear leg in the trunks type disposable diaper as shown in the figure, the angle between the contraction direction and the width direction WD becomes shallow, so that the width component of the contraction force is large. Therefore, the crushing of the diffusion groove 17 can be prevented more effectively.

Although it is conceivable to use other elastic members such as the waist elastic member 24 and the waist lower elastic member 25, the elastic members 24 and 25 in the waist circumference region corresponding to the side seal portion 21 pass through the intermediate region 22. Therefore, it is not possible to prevent the diffusion groove 17 from being crushed in the intermediate region 22 which is a portion sandwiched between the two legs. Further, the lower waist elastic member 25 may be provided in the intermediate region 22, but since one end of the lower waist elastic member 25 is located at the leg opening instead of the side seal portion 21, it is diffused even if it is used. The collapse of the groove 17 cannot be suppressed.

When the diffusion groove 17 is prevented from being crushed by the front leg elastic member 27 and the rear leg elastic member 26, the front leg elastic member 27 and the rear leg elastic member 26 are provided in a front-rear symmetrical arrangement with respect to the number and arrangement thereof, although not shown. If this is done, the vertical components of the contraction force of the elastic member 27 around the front leg and the elastic member 26 around the rear leg cancel each other out, so that the force of the width direction WD is balanced with respect to both sides of the diffusion groove 17 in the absorber 13. It acts and the effect of preventing the diffusion groove 17 from being crushed is further enhanced.

When at least one elastic member 27 around the front leg and at least one elastic member 26 around the rear leg intersect (connect) on both sides of the intermediate region 22 in the width direction, the center side in the width direction is closer to the intersection position. The elastic member 27 around the front leg and the elastic member 26 around the rear leg are cut at the same time. As shown in FIG. 17, when a group of a plurality of elastic members around the front legs and a group of a plurality of elastic members around the hind legs intersect on both sides of the width direction WD of the intermediate region 22, as shown in FIG. If the mutual spacing of the elastic members in the group of the elastic members around the front legs 27 and the mutual spacing of the elastic members in the group of the elastic members around the rear legs are narrowed toward the center side in the width direction, the cutting position may be slightly deviated or the cut elasticity may be reduced. Even if the member is not fixed and moves in the expansion / contraction direction, one of the elastic members around the front leg 27 and one of the elastic members around the rear leg 26 intersect and the predecessor is along the edge 29 of the leg opening. It is preferable because the continuity of the elastic member 27 around the front leg and the elastic member 26 around the rear leg tends to remain from the side seal portion 21 of the roller F to the side seal portion 21 of the rear body B.

As a method of cutting the elastic members 24 to 27 to form a non-stretchable region, for example, the techniques described in JP-A-2002-35029, JP-A-2002-178428 and JP-A-2002-273808 can be adopted. it can. The elastic member 25 at the lower part of the waist can be continuously arranged across the interior body 10 without cutting.

The elongation rate of the elastic members 24 to 27 at the time of fixing can be appropriately determined, but in the case of a normal adult, the waist elastic member 24 is about 160 to 320%, and the waist lower elastic member 25 is about 160 to 320%. The elastic member 27 around the front leg and the elastic member 26 around the rear leg can be about 230 to 350%. In particular, when a plurality of elastic members 27 around the front legs and elastic members 26 around the rear legs are provided, the elongation rate is gradually increased as it approaches the edge of the leg opening, and conversely, the extension rate is gradually decreased. Is also a preferred form. The thickness of the elastic member can be changed in the same manner as the change in the elongation rate.

The waist elastic member 24, the waist lower elastic member 25, and the leg circumference elastic members 26, 27 are sandwiched between the folded portions 20C of the back sheet and between the presser sheet 20A and the back sheet 20B, and these sheets 20A. , 20B is adhesively fixed with a hot melt adhesive. The application pattern of the hot melt adhesive can be appropriately determined, but as shown in FIG. 9, the adhesive portion B1 for fixing the waist elastic member 24 and the waist lower elastic member 25 is the waist elastic member 24. It is preferable that only the arrangement portion and its vicinity, the arrangement portion of the waist elastic member 25 and its vicinity are provided. FIG. 9 shows the application portion B1 of the hot melt adhesive in the manufacturing process, and the hot melt adhesive B1 for fixing the waist elastic member 24 and the waist lower elastic member 25 to both sheets 20A and 20B is It is applied substantially only to the arrangement portion of each of the elastic members 24 and 25 and its vicinity. Such application of the adhesive can be realized by sandwiching the waist elastic member 24 and the waist lower elastic member 25 to which the adhesive is applied on the outer peripheral surface between the sheets 20A and 20B.

On the other hand, the hot melt adhesive B2 for fixing the elastic members 26 and 27 around the legs to the pressing sheet 20A and the back sheet 20B is, for example, as shown in FIG. 9, the entire range in the front-rear direction having the elastic members 26 and 27 around the legs. In addition to being applied continuously in the width direction, it can also be applied in a stepped manner along the elastic members 26 and 27 around the legs (not shown).

(Front and rear presser sheet)
As shown in FIGS. 1 and 4, the front and rear presser sheets are used to cover the front and rear ends of the interior body 10 mounted on the inner surface of the exterior body 20 and to prevent leakage from the front and rear edges of the interior body 10. 50 and 60 may be provided. Explaining the illustrated form in more detail, the front presser sheet 50 extends over the entire width direction from the inner surface of the folded portion 20C of the inner surface of the front body F to the position where it overlaps with the front end portion of the interior body 10. Reference numeral 60 denotes an entire width direction extending from the inner surface of the folded-back portion 20C of the inner surface of the rear body B to a position overlapping the rear end portion of the interior body 10. As shown in the illustrated form, if the front and rear presser sheets 50 and 60 are attached as separate bodies, there is an advantage that the degree of freedom in material selection is increased, but there is also a demerit such as an increase in materials and manufacturing processes. Therefore, the folded-back portion 20C can be extended to a portion overlapping the interior body 10 to form a portion equivalent to the above-mentioned pressing sheets 50 and 60.

(Interior body joint)
As shown enlarged in FIG. 10, the interior body joint portion 18, which is the joint region between the exterior body 20 and the interior body 10, has the front leg elastic members 27 and the rear leg elastic on both sides in the width direction WD in the intermediate region 22. It is preferable that the member 26 is provided only on the central side in the width direction WD from the intersection position C1. As a result, the elastic member 27 around the front leg and the elastic member 26 around the rear leg do not expand and contract together with the interior body 10 in the intermediate region 22, so that the elastic member 27 around the front leg and the elastic member 26 around the rear leg intersect to open the leg. Although it is substantially continuous along the edge 29, the fit is not deteriorated at the portion including the intersection position C1 of the elastic member 27 around the front leg and the elastic member 26 around the rear leg.

The interior body joint portion 18 may be located only on the central side of the width direction WD from the intersection position C1 of the front leg circumference elastic member 27 and the rear leg circumference elastic member 26 on both sides of the width direction WD over the entire front-rear direction. However, as shown in the illustrated figure, it is preferable that the intermediate region 22 exists on both the front and rear sides from the intersection position C1 to the outside of the width direction WD.

It is preferable that the interior body joint 18 is provided only on the center side of the WD in the width direction in the intermediate region 22 with respect to the intersection position C1 of the elastic members 27 around the front legs and the elastic members 26 around the rear legs on both sides of the WD in the width direction. However, even in that case, if the highly rigid absorber 13 exists to the side of the interior body joint 18, the elastic members 26 and 27 around the legs have an effect of improving the fit. Be hindered. Therefore, as shown in FIG. 11, in the absorber 13, the intermediate portion of the LD in the front-rear direction is a constricted portion 13N narrower than both front and rear sides thereof, and the narrowest portion in the constricted portion 13N is an interior body joint. It is also preferable that the portion 18 is located closer to the center of the WD in the width direction than both side edges.

The elastic region around the front leg and the elastic member 26 around the rear leg are provided up to the center side of the WD in the width direction from the intersection position C1 of the elastic member 27 around the front leg and the elastic member 26 around the rear leg on both sides of the WD in the width direction. If so, the absorber 13 contracts in the width direction WD, and the wearing feeling deteriorates. Therefore, as shown in the illustrated embodiment, the elastic members around the front legs 27 and the elastic members around the rear legs 26 are crossed to maintain continuity, and the elastic members around the front legs 27 and the elastic members around the rear legs 26 on both sides in the width direction WD. It is preferable that the elastic member 27 around the front leg and the elastic member 26 around the rear leg have a non-stretchable region 19 finely cut on the center side of the WD in the width direction with respect to the intersection position C1.

On the other hand, as shown in FIG. 12, it is assumed that a group of a plurality of front leg elastic members 27 and a group of a plurality of rear leg elastic members 26 intersect on both sides of the width direction WD of the intermediate region 22. As shown in an enlarged manner in FIG. 13 (a), there are many intersecting positions (circled in the figure) of the elastic members around the legs 26 and 27 in a small area, and the elastic members around the legs 26 and 27 Since the enclosed part bulges like a hump, the flexibility is reduced compared to other parts. Therefore, as shown in FIG. 13B, when each of the front leg elastic member 27 and the rear leg elastic member 26 is ordered in this order from the one closest to the edge 29 of the leg opening to the one farthest from the edge 29 of the leg opening. The elastic members 27 around the front legs and the elastic members 26 around the rear legs, which are in the same order, are continuous from the side seal portion 21 to the mutual intersection position (the portion circled in the figure), and are on the center side of the width direction WD from the mutual intersection position. A form is also proposed in which each of the parts is cut so as not to expand and contract substantially. The reference numeral CP in the figure indicates a cutting pattern. By adopting such a cutting pattern CP, the combination of the elastic member 27 around the front leg and the elastic member 26 around the rear leg that are continuous along the edge 29 of the leg opening is connected around the front leg at the intersections shown by circles. Since each of the elastic member 27 and the elastic member 26 around the rear leg is combined, and the elastic member 27 around the front leg and the elastic member 26 around the rear leg of each set do not intersect with each other, the flexibility is unlikely to decrease.

Further, as shown in FIG. 14, when the front leg elastic member 27 and the rear leg elastic member 26 are ordered in this order from the farthest to the closest to the edge 29 of the leg opening, the order is the same. Of the front leg elastic member 27 and the rear leg elastic member 26, the front leg elastic member 27 extends from the side seal portion 21 to the intersection position with the rear leg elastic member 26 in the following order (the portion circled in the figure). The elastic members around the hind legs are continuous from the side seal portion 21 to the intersection position with the elastic members around the front legs 27 in the next order (the portion circled in the figure), and are on the WD center side in the width direction from the intersection positions with each other. A form is also proposed in which each of the parts is cut so as not to expand and contract substantially. Even when such a cutting pattern is adopted, the combination of the front leg elastic member 27 and the rear leg elastic member 26 that are continuous along the leg opening is connected at the intersection position shown by the circle. And each one of the elastic members around the hind legs 26 is combined, and since the elastic members 27 around the front legs and the elastic members 26 around the hind legs do not intersect each other in each set, the flexibility is unlikely to decrease. Further, in this embodiment, the intersection position C1 of the front leg elastic member 27 and the rear leg elastic member 26 is closer to the leg opening, and the front leg elastic member 27 and the rear leg elastic member have a shape closer to the edge 29 of the leg opening. It also brings the advantage that 26 are continuous.

(Other)
In the above embodiment, the structure for preventing the diffusion groove from being crushed by the elastic members 26 and 27 around the legs is applied to the trunks type disposable diaper, but as shown in FIGS. 15 and 16, the crotch portion of the exterior body 20 absorbs. It can also be applied to pants-type disposable diapers that do not extend to one side and the other side in the width direction from the circumscribing rectangle of the body 13 and do not have a leg tube portion. Since this pants-type disposable diaper is the same as the trunks-type disposable diaper except that it does not have a leg tube portion, the same reference numerals are given and the description thereof will be omitted.

<Explanation of terms in the specification>
The following terms in the specification have the following meanings unless otherwise specified in the specification.
-"Front body" and "rear body" mean the front and rear parts of the disposable diaper with the center in the front-rear direction as the boundary, respectively.
"Crotch portion" means a portion that is located in the crotch of the wearer, and normally, as shown in FIG. 18, the tangent line and the front and back of the edge 29 of the leg opening in the unfolded state including the center in the front-back direction. It means a range 28 in the front-rear direction in which the acute-angled intersection angle with the direction is 45 ° or less.
-"Elongation rate" means a value when the natural length is 100%.
・ "Metsuke" is measured as follows. After pre-drying the sample or test piece, leave it in a test room or device in a standard state (the test place is a temperature of 20 ± 5 ° C. and a relative humidity of 65% or less) to bring it into a constant weight state. Pre-drying refers to making a sample or test piece constant in an environment where the relative humidity is 10 to 25% and the temperature does not exceed 50 ° C. It is not necessary to pre-dry the fibers having an official moisture content of 0.0%. A sample having a size of 200 mm × 250 mm (± 2 mm) is cut out from the test piece in a constant weight state using a paper density plate (200 mm × 250 mm, ± 2 mm). Weigh the sample, calculate the weight per square meter, and use it as a basis weight.
-The "thickness" of the absorber is the thickness measuring instrument of Ozaki Seisakusho Co., Ltd. (peacock, dial thickness gauge large type, model J-B (measurement range 0 to 35 mm) or model K-4 (measurement range 0 to 50 mm)) Measure with the sample and the thickness measuring device horizontal.
-The "thickness" other than the above is automatically measured using an automatic thickness measuring device (KES-G5 handy compression measurement program) under the conditions of ^{a load of 0.098 N / cm 2} and a pressurized area of 2 cm ^2.
-"Unfolded state" means a state in which the unfolded state is flat without shrinkage or slack.
-Unless otherwise specified, the dimensions and positional relationships of each part mean the dimensions in the unfolded state, not in the natural length state.
-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). ..

The present invention can be used for pants-type disposable diapers, more preferably trunks-type disposable diapers.

10 ... Interior body, 11 ... Top sheet, 12 ... Liquid permeable sheet, 13 ... Absorber, 13N ... Constricted part, 14 ... Packaging sheet, 15 ... Gather sheet, 16 ... Gather elastic member, 17 ... Diffusion groove, 18 ... Interior body joint, 19 ... Non-stretchable area, 20 ... Exterior body, 20C ... Folded part, 21 ... Side seal part, 22 ... Intermediate area, 24 ... Waist elastic member, 25 ... Waist lower elastic member, 26 ... Rear Elastic member around the leg, 27 ... Elastic member around the front leg, 28 ... Crotch part, 29 ... Edge of leg opening, 30 ... Leg tube part, 31 ... Inner thigh contact part, B ... Back body, BS ... Three-dimensional gather, C1 ... Crossing Position, F ... front body, LD ... front-back direction, WD ... width direction.

Claims (4)

An exterior body having a waist opening and a pair of leg openings extending from the edge of the front waist opening to the edge of the rear waist opening, and an interior body including an absorber provided at least in the crotch portion of the exterior body. It has a side seal portion that joins both front side portions and rear side side portions of the exterior body.
On at least one side of the front and rear of the exterior body, from one side seal portion toward the center in the width direction along the edge of the leg opening, across the center in the width direction toward the other leg opening, the other It has one or a plurality of elongated leg-surrounding elastic members that are attached in a pattern along the edge of the leg opening to the other side seal portion and do not intersect with each other.
The absorber has diffusion grooves extending on both front and rear sides of an intermediate region, which is a region between the edge of one leg opening and the edge of the other leg opening.
In pants-type disposable diapers
The leg-surrounding elastic member is continuous from the side seal portions on both sides in the width direction to the end portion on the diffusion groove side in the region between the side edge of the absorber and the diffusion groove, and is a portion overlapping the diffusion groove. The portion of the exterior body that overlaps with the diffusion groove is a non-stretchable region.
Pants-type disposable diapers that feature this. The crotch portion of the exterior body has a pair of inner thigh contact portions extending in one side and the other side in the width direction with respect to the circumscribing rectangle of the absorber, and the leg opening including these inner thigh contact portions. A trunks type disposable diaper whose part along the edge is a pair of leg cylinders that surround the base of the thigh.
The pants-type disposable diaper according to claim 1. As the leg-surrounding elastic member, on the front side of the exterior body, from one side seal portion toward the center in the width direction along the edge of the leg opening, and across the center in the width direction toward the other leg opening. It has one or a plurality of elongated front leg elastic members that are attached in a pattern along the edge of the other leg opening to the other side seal.
As the leg-surrounding elastic member, on the rear side of the exterior body, one side seal portion is directed toward the center in the width direction along the edge of the leg opening, and crosses the center in the width direction to the other leg opening. It has one or more elongated hind leg elastic members that face each other and are attached in a pattern that extends along the edge of the other leg opening to the other side seal.
The front leg elastic member and the rear leg elastic member are attached in a pattern in which at least one of the front leg elastic members and at least one of the rear leg elastic members intersect on both sides in the width direction of the intermediate region. Has been
In the intermediate region, the interior body joint portion, which is the joint region between the exterior body and the interior body, is located on the center side in the width direction with respect to the intersection position of the front leg circumference elastic member and the rear leg circumference elastic member on both sides in the width direction. Moreover, it is provided so as to extend over both sides in the width direction of the diffusion groove.
The intersection position and the diffusion groove are separated in the width direction .
The pants-type disposable diaper according to claim 1 or 2. The elastic members around the front legs and the elastic members around the rear legs are provided in a front-rear symmetrical arrangement with respect to the number and arrangement thereof.
The pants-type disposable diaper according to claim 3.

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