JP2017225847A - Pants type throw-away product - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce or remove discomfort caused by a side seal part.SOLUTION: A pants type throw-away product has a structure in which, in a boundary area extending over a boundary B with at least a side seal part 21 on either body X of a front body F and a back body B, shrinkage force of an elastic member 25 is weak or is not exhibited, and a structure in which, in a boundary area on another body Y, shrinkage force of the elastic member 25 is strong or is exhibited.SELECTED DRAWING: Figure 7

Description

  The present invention relates to a pants-type disposable product such as a pants-type disposable diaper.

  The pants-type disposable diaper includes an exterior body that individually or integrally configures the front body and the back body, and an interior body including an absorbent body that is attached to the inner surface of the exterior body so as to extend from the front body to the back body. Generally, a waist opening and a pair of left and right leg openings are formed by joining the side edges of the outer body of the front body and the side edges of the outer body of the rear body to form a side seal part. Is. Moreover, in a pants type disposable diaper, in order to improve fit property, it is common to provide elastic members, such as a rubber thread, in a leg periphery part and a trunk periphery part, for example.

  Several proposals have been made regarding the side seal portion (Patent Documents 1 and 2). All of these are devised with respect to the form of the side seal part itself in order to prevent it from falling off and being fixed by the contraction force of the elastic member.

On the other hand, as will be described later with reference to the drawings, including the example of the patent document, the contraction force of the elastic member of the front body and the contraction force of the elastic member of the back body balance the side seal portion. The side seal part at the time of wearing will become a form which protrudes in the direction away from a wearer generally.
The side seal portion is a hard portion as compared with other portions because the material is compressed in a superposed state.

Therefore, on the wearer side where the widthwise end portions of the front body and the back body face the side seal portion, there is a tendency that the rigidity is higher than other inner surface regions, and the wearer's skin may be uncomfortable.
In addition, the side seal portion tends to radially protrude from the wearer, which may give an uncomfortable feeling when touched with a hand.

JP2013-128575A JP 2000-279444 A

  Then, the main subject of this invention is providing the underpants type disposable product which reduces or eliminates the uncomfortable feeling by a side seal part.

The present invention that has solved the above problems
A stretchable member disposed between a pair of seats and integrated with a stretchable member that gives stretchable force in the width direction, both side edges of the front body and the backbody have side seal portions by mutual joining, a waist opening and a pair of left and right In pants-type disposable products with leg openings formed,
In the boundary region straddling at least the boundary with the side seal part in one body of the front body or the back body, the contraction force of the elastic member is weak or not exerted, and in the boundary region in the other body, the elasticity The present invention relates to a pants-type disposable product characterized by having a structure in which the contraction force of the member is strong or exerts.

In one body, at least in the boundary region straddling the boundary with the side seal portion, the elastic member has a weak contraction force or does not exhibit the elasticity. In the other boundary region, the elastic member exhibits a strong contraction force. When it is the structure to do, a side seal part shows the tendency which falls to the other body part.
As a result, the uncomfortable feeling due to the side seal portion is reduced.

The elastic member is a plurality of thin members (for example, rubber thread) in the front-rear direction, and is fixed to and integrated with a sheet constituting the front body and the back body by a hot melt adhesive, and in the boundary region in the other body ,
When the elastic member is not integrated with at least one of the pair of sheets on the wearer side, the side seal portion tends to fall on the other body.

  As an example in the above embodiment, in the side seal portion, the outside of the side edge portion is continuous in the front-rear direction, and the inside of the side edge portion is discontinuous in the front-rear direction. In the aspect in which the member is located and reaches the outside of the side edge portion, the side seal portion tends to fall on the other body.

The elastic member is a plurality of thin members in the front-rear direction, fixed and integrated with the sheet constituting the front body and the back body by a hot melt adhesive, at least in the boundary region in the one body,
Even if the elastic member is not positioned, the side seal portion tends to fall on the other body.

The elastic member which expands / contracts in the width direction may be sufficient as the said elastic member of a front body and a back body.
This elastic film is fixed and integrated with the sheets constituting the front and back bodies, and is not integrated with one of the pair of sheets on the wearer side in the boundary region of the other body. It can be set as an aspect.

  The elastic member of the front body and the back body is an elastic film that expands and contracts in the width direction, and is fixed to and integrated with a sheet constituting the front body and the back body, and at least in the boundary region of the other body, the elastic member Can be a mode that is not integrated with each of the pair of sheets.

  Under the form that is not integrated with each of the pair of sheets, in the first place, the elastic member is not located at least in the boundary region, so that it is not integrated with each of the pair of sheets. Also good.

  As described above, according to the present invention, the uncomfortable feeling caused by the side seal portion is reduced or eliminated.

It is a top view (inner surface side) of the underpants type disposable diaper of a deployment state. It is a top view (outer surface side) of the underpants type disposable diaper of a deployment state. It is CC sectional drawing of FIG. It is AA sectional drawing of FIG. It is BB sectional drawing of FIG. It is a perspective view of the wearing state of a pants type disposable diaper. The example of a side seal part is illustrated schematically, (a) is a conventional example, (b) is a conceptual cross-sectional view of the first embodiment in an unfolded state, and (c) is a side seal part is lying down. It is a conceptual sectional view of the state which is carrying out. (A) is a conceptual sectional view of the second embodiment in a state where it does not fall down, and (b) is a conceptual sectional view of a state in which the side seal portion is lying down. (A) is conceptual sectional drawing of the state which does not fall down of 3rd Embodiment, (b) is a conceptual sectional drawing of the state in which the side seal part is lying down. (A) is a principal part top view of the side seal part of 4th Embodiment, (b) is a conceptual sectional drawing of the state in which the side seal part is lying down. It is a principal part top view of the other example of a side seal part.

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%. Moreover, the fine dot pattern part in a figure has shown that joining means, such as a hot-melt-adhesive, exists.
1-6 has shown an example of the underpants type disposable diaper. This pants-type disposable diaper (hereinafter also simply referred to as a diaper) has an outer body 20 that integrally constitutes a front body F and a rear body B, and an inner surface of the outer body 20 so as to extend from the front body F to the rear body B. The interior body 10 has a fixed interior body 10 in which an absorber 13 is interposed between a liquid-permeable top sheet 11 and a liquid-impermeable back sheet 12.
For example, at the time of manufacture, after the back surface of the interior body 10 is joined to the inner surface (upper surface) of the exterior body 20 by a joining means such as a hot-melt adhesive (dotted portion in FIG. 2), the interior body 10 and the exterior The body 20 is folded at the center in the front-rear direction (vertical direction), which is the boundary between the front body F and the back body B, and both side portions thereof are joined to each other by heat welding or hot melt adhesive to form the side seal portion 21. By doing so, a pants-type disposable diaper having a waist opening and a pair of left and right leg openings is formed.

(Structural example of interior body)
As shown in FIGS. 3 to 5, for example, the interior body 10 includes an absorbent body 13 between a liquid-permeable top sheet 11 made of a nonwoven fabric and the like and a liquid-impermeable back side sheet 12 made of polyethylene or the like. It has an intervening structure and absorbs and retains excretory fluid that has passed through the top sheet 11. Although the planar shape of the interior body 10 is not particularly limited, it is generally a substantially rectangular shape as illustrated.

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

  As the liquid-impermeable back sheet 12 that covers the back surface side (non-skin contact surface side) of the absorbent body 13, a liquid-impermeable plastic sheet such as polyethylene or polypropylene is used. Those having wettability are preferably used. This water-impervious / breathable sheet is a microporous sheet obtained by, for example, melt-kneading an inorganic filler in an olefin resin such as polyethylene or polypropylene to form a sheet, and then stretching in a uniaxial or biaxial direction. is there.

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

  The overall shape of the absorbent body 13 is formed in a substantially hourglass shape having a narrowed portion 13N having a narrower width than the front and rear sides at the crotch portion, but may have an appropriate shape such as a rectangular shape. Although the size of the constricted portion 13N can be determined as appropriate, the length in the front-rear direction of the constricted portion 13N can be about 20 to 50% of the total length of the diaper, and the width of the narrowest portion is 40% of the total width of the absorber 13. It can be about -60%. In the case where the constricted portion 13N is provided, if the planar shape of the interior body 10 is substantially rectangular, the remainder of the interior body 10 that does not include the absorber 13 in the portion corresponding to the constricted portion 13N of the absorber 13. A part is formed.

  In the illustrated form, solid gather BSs that fit around the legs are formed on both sides of the interior body 10. As shown in FIGS. 4 and 5, the three-dimensional gather BS includes a fixed portion fixed to a side portion on the back surface of the interior body, and a side portion on the surface of the interior body from the fixed portion through the side of the interior body. The body part that extends to the front, the front and rear ends of the body part in a lying state, and the lying part that is fixed to the side of the surface of the interior body, and the freedom part that is formed with this lying part being unfixed The part is formed by a three-dimensional gathered sheet 15 which is a double sheet by folding. As the three-dimensional gather sheet 15, a non-woven fabric having water repellency is preferably used.

  In addition, an elongated three-dimensional gathered elastic member 16 is disposed between the sheets of the double sheet at the tip of the free part. In the product state, the three-dimensional gather elastic member 16 is for forming a three-dimensional gather BS by erecting a free part protruding from the absorber side edge portion by elastic stretching force as shown by a two-dot chain line in FIG.

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

  As the gathered elastic member 16, materials such as styrene rubber, olefin rubber, urethane rubber, ester rubber, polyurethane, polyethylene, polystyrene, styrene butadiene, silicon, and polyester that are usually used can be used. Further, in order to make it difficult to see from the outside, it is preferable that the thickness is 925 dtex or less, the tension is 150 to 350%, and the interval is 10.0 mm or less. The gathered elastic member 16 may be a tape-like member having a certain width in addition to the thread-like shape shown in the figure.

  In the same manner as the liquid-permeable surface sheet 11, the material fibers constituting the three-dimensional gather sheet 15 are olefin-based, such as polyethylene or polypropylene, polyester-based, amide-based synthetic fibers, regenerated fibers such as rayon and cupra, Non-woven fabric obtained by an appropriate processing method such as a spunbond method, a thermal bond method, a melt blown method, a needle punch method, etc. can be used. It is preferable to use a non-woven fabric with a low basis weight and excellent air permeability. Furthermore, with respect to the three-dimensional gather sheet 15, in order to prevent the transmission of urine and the like, to prevent fogging, and to improve the touch to the skin (dry feeling), a silicon-based, paraffin metal-based, alkylchromic chromoid-based water repellent It is desirable to use a water-repellent non-woven fabric coated with such as.

(External body structure example)
The exterior body 20 has a part constituting the front body F extending from the center in the front-rear direction to the ventral side and a part constituting the back body B extending from the center in the front-rear direction to the back side. The side seal part 21 is formed by joining both side parts of the back body B and the both sides of the back body B, and as shown in FIG. 6, a pair of left and right sides for passing the waist opening and legs for passing the wearer's torso Leg openings are formed.

  The exterior body 20 includes a waist portion T defined as a longitudinal range (a longitudinal range extending from the waist opening to the upper end of the leg opening) having the side seal portion 21, and a longitudinal range (front body F) of a portion forming the leg opening. Leg opening L defined as a vertical region having the side seal portion 21 and a vertical region having the side seal portion 21 of the back body B. The waistline portion T can be divided into a waist portion W that conceptually forms an edge portion of the waist opening and a waist lower portion U that is a lower portion than this. Usually, when there is a boundary (for example, the thickness or elongation rate of the elastic stretchable member changes) in the waist circumference portion T, the waist opening side is the waist portion W from the most waist opening side boundary. When there is no such boundary, the waist opening side becomes the waist portion W from the absorber 13 or the interior body 10.

  As shown in FIGS. 4 to 6, the exterior body 20 has a two-layer structure including a press sheet 20 </ b> A and a back sheet 20 </ b> B each made of a nonwoven fabric or the like, between the press sheet 20 </ b> A and the back sheet 20 </ b> B, and the back Various elastic members are disposed between the nonwoven fabrics of the folded portion 20C formed by folding the sheet 20B to the inner surface side at the waist opening edge, and elasticity is imparted. The planar shape has a pseudo hourglass shape as a whole by the concave leg surrounding lines 29 formed to form leg openings on both sides of the middle.

  In the front body F and the back body B, the exterior body 20 in the illustrated form includes a waist elastic member 24 disposed in the waist W as an elastic member along the width direction, and a waist lower part disposed in the waist lower part U. In addition to the leg elastic member 25 and the leg opening elastic member 27 disposed in the leg opening L, separately from these, the side seal part 21 extends while curving in a pattern toward the crotch portion along the monopod opening. The curved elastic members 26 and 28 are provided. These elastic members 24 to 28 are fixed in a state of being stretched at a predetermined stretch rate along their extending directions. In addition, in this exterior body 20, what is called a leg periphery elastic member which continues from the side seal part of the front body F to the side seal part of the back body B along the leg periphery line 29 is not provided.

  The waist elastic member 24 is for tightening the wearer's waist with elasticity. In the illustrated example, the elastic member 24 is an elongated elastic member such as rubber thread attached in an extended state along the width direction between the layers in the waist W. A plurality of lines are provided at intervals in the vertical direction. For the waist elastic member 24, rubber thread is used in the illustrated example. However, for example, a tape-like elastic member may be used. Moreover, although the waist part elastic member 24 of the illustration form is clamped between the nonwoven fabrics of the folding | returning part 20C of the back sheet 20B in a waist part, you may clamp between 20 A of pressing sheets, and the back sheet 20B. The waist elastic member 24 is desirably provided over the entire width direction of the waist W.

  The waist lower part elastic member 25 is for attaching the diaper to the lower abdomen and the buttocks of the wearer with elasticity, and in the illustrated example, is attached in an extended state along the width direction between the layers in the waist lower part U. It is an elongated elastic member such as rubber thread, and a plurality of elastic members are provided at intervals in the vertical direction. It is desirable that the waist lower part elastic member 25 is provided on both sides in the width direction of the intermediate part in the width direction of the absorber in the waist lower part U, and the side edges are provided up to the side seal part 21.

  The leg opening elastic member 27 is mainly for giving a stretchability in the width direction to a portion along the leg opening. In the illustrated example, the leg opening elastic member 27 is attached in an extended state along the width direction between the layers in the leg opening L. A plurality of elastic members such as rubber thread are provided, and a plurality of elastic members are provided at intervals in the vertical direction. It is desirable that the leg opening elastic member 27 is provided at least on both sides in the width direction of the intermediate part in the width direction of the absorber of the leg opening L, and the side edge is provided up to the leg opening edge 29.

In the form shown in the figure, in the range from the waist portion T to the leg opening L in the exterior body 20, apart from the waist elastic member 24, the waist lower elastic member 25, and the leg opening elastic member 27, thread rubber, etc. Curved elastic members 26 and 28 made of a long and slender elastic member are arranged along a predetermined curve. The number of the curved elastic members 26 and 28 may be one, but it is preferable that they are plural. In the illustrated example, the curved elastic members 26 and 28 are elongated elastic members such as four rubber threads. They are arranged at intervals without crossing each other. The curved elastic members 26 and 28 are arranged in a bundle of about two or three elastic members with a close interval, and 3 to 20 mm, preferably 6 to form a predetermined stretch zone. Three or more, preferably four or more are arranged with an interval of about ˜16 mm.
The leg opening elastic member 27 is provided with the curved elastic members 26 and 28 as necessary, and may not have these.

  The exterior body 20 mentioned above can be manufactured by the technique of Unexamined-Japanese-Patent No. 4-28363 or Unexamined-Japanese-Patent No. 11-332913, for example. Moreover, in order to cut | disconnect the curved elastic members 26 and 28 on the interior body 10, it describes in Unexamined-Japanese-Patent No. 2002-35029, Unexamined-Japanese-Patent No. 2002-178428, and Unexamined-Japanese-Patent No. 2002-273808. A cutting method is preferably employed.

  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. When the curved elastic members 26 and 28 are provided on both the front body F and the back body B, a part or all of the group of the curved elastic members 28 disposed on the front body F side and the back body B side are disposed. Although a form (not shown) in which a part or all of the group of curved elastic members 26 formed can be adopted, the group of curved elastic members 28 arranged on the front body F side as shown in the example, A configuration in which the curved elastic members 26 arranged on the back body B side are separated from each other in the longitudinal direction at a position slightly deviated from the front-rear direction intermediate portion, particularly the front body F without crossing each other.

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

  Although the elongation rate at the time of attachment of the elastic members 24 to 28 can be determined as appropriate, in the case of a normal adult, the waist elastic member 24 is about 160 to 320%, the waist lower elastic member 25 and the leg opening elastic member. 27 may be approximately 160 to 320%, and the curved elastic members 26 and 28 may be approximately 230 to 320%.

(Front / rear presser sheet)
As shown in FIGS. 1 and 4, in order to cover the front and rear end portions 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. The illustrated embodiment will be described 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 waist side end portion to the position overlapping the front end portion of the interior body 10 in the inner surface of the front body F. The rear presser sheet 60 extends across the entire width direction from the inner surface of the folded portion 20C at the end on the waist side to the position overlapping the rear end of the interior body 10 in the inner surface of the back body B. If a slight non-adhesive portion is provided in the crotch side edges of the front and rear presser sheets 50, 60 over the entire width direction (or only the central portion), not only the adhesive does not stick out, but also this portion is removed from the surface sheet. It can be lifted slightly to function as a leak-proof wall.

  When the front and rear presser sheets 50 and 60 are attached as shown in the figure, there is an advantage that the degree of freedom of material selection is increased, but there are also disadvantages such as an increase in materials and manufacturing processes. Therefore, the folded portion 20C formed by folding the exterior body 20 on the inner surface of the diaper can be extended to a portion overlapping the interior body 10 to form a portion equivalent to the presser sheets 50 and 60 described above.

The pulling elastic member 30 is excellent in the pulling effect when it extends to a position overlapping the side portion of the absorber 13, but even if it coincides with the side edge of the absorber 13 or is separated from the side edge. good.
The contraction force by the pulling elastic member 30 may be the same as the contraction force of other elastic members (in the illustrated embodiment, the waist lower part elastic member 25 (corresponding to the basic elastic member)). It is preferable that the exterior body 20 fits the waist lower part elastic member 25 and the leg opening elastic member 27 more securely. The contraction force means a value at the same elongation rate, and can be varied by a known method such as the type of elastic member, the elongation rate at the time of attachment, and the thickness.

(Other)
In the above example, the front body F to the back body B are continuously covered by the integrated exterior body 12, but the exterior body is divided into those constituting the front body F and those constituting the back body B. The outer body of the front body F and the outer body of the rear body B are not continuous on the crotch side and can be separated (not shown). In this case, the outer body of the front body has at least a portion that overlaps with the vertically stretchable portion, portions on both sides in the width direction, and portions on the waist opening side. Moreover, the back surface of the interior body can be covered with a crotch outer body such as a nonwoven fabric.

<About side seal part>
The present invention is arranged between a pair of seats and integrated with a stretch member that gives stretch force in the width direction, both side edges of the front body and the back body have side seal portions by mutual joining, and a waist opening In addition, the present invention relates to a pants-type disposable product in which a pair of left and right leg openings are formed, and in particular, the structure around the side seal portion is devised.

The pants-type disposable product of the present invention is intended for a product in which a waist opening and a pair of left and right leg openings are formed, and both side edges of the front body and the back body have side seal portions formed by mutual bonding.
Therefore, in addition to a pants-type disposable diaper for use in receiving and absorbing body fluids, for example, disposable pants may be used.

  For example, FIG. 7 to FIG. 10 in a state where both side edges of the front body F and the back body B of FIG. 1 and FIG. 2 are joined to each other and the side seal portion 21 shown in FIG. An example of the structure around the side seal portion of the present invention will be described with reference to FIG.

  According to the present invention, as shown in FIG. 7 (a), is the contraction force of the elastic member weak in at least a boundary region straddling the boundary B with the side seal portion in one of the front body and the back body? A pants-type disposable product is provided that has a structure that does not exhibit and has a structure in which the contraction force of the elastic member is strong or exhibited in the boundary region in the other body.

  First Embodiment shown in FIGS. 7B and 7C, Second Embodiment shown in FIGS. 8A and 8B Third Embodiment shown in FIGS. 9A and 9B In any of the fourth embodiments shown in FIGS. 10 (a) and 10 (b), at least the side seal portion in one body X (the body on the left side in the drawing) X of the front body or the back body. In the boundary region straddling the boundary B with the elastic member, the elastic member has a weak contraction force or does not exhibit the force. In the boundary region of the other body (the right body in the drawing) Y, the elastic member has a strong contraction force. It is a structure that demonstrates it.

  As an example of the elastic member in the side seal portion 21 in the present invention, there are a plurality of thin members (for example, rubber thread) in the front-rear direction. In the above-described pants-type disposable diaper, the waist elastic member 24, the waist lower portion The elastic member 25, the leg opening elastic member 27, and the curved elastic members 26 and 28 are targeted, but the elastic member 25 is illustrated for the sake of simplicity.

In the conventional example, the contraction force of the elastic member in one body X and the contraction force of the elastic member in the other body Y are the same as those in the embodiment. Therefore, as shown in FIG. The part 21 comes to stand almost orthogonally.
As a result, the compressive force of the elastic member 25 of the body X and the elastic member 25 of the body Y concentrates on the wearer's region Z corresponding to the width region sandwiching the boundary B, and the compression force by the highly rigid side seal portion 21. Acts to give the wearer an uncomfortable feeling due to the side seal portion 21.
Moreover, when the side seal part 21 stands up, when touching the surface of a disposable diaper so that it may touch, it also gives the sense of incongruity as a protrusion. It also gives an uncomfortable appearance.

  On the other hand, as shown in FIG. 7 (c), when the side seal part 21 is laid down on the other body Y side, the highly rigid side seal part 21 is in a laid down state. The discomfort caused by the side seal portion 21 is eliminated or reduced.

In the first embodiment shown in FIGS. 7B and 7C, the elastic member 25 is a plurality of thin members in the front-rear direction (direction passing through the drawing in FIG. 7). The elastic member 25 is fixed to and integrated with a sheet constituting the back body, and the elastic member 25 is not located in at least the boundary region of the one body X.
That is, the elastic member 25 is not located in the boundary region straddling the boundary B. In this case, in one body X, the elastic member 25 tends to contract together with the presser sheet 20A and the back sheet 20B in the width direction of the product (left and right direction in the drawing).
If the force to shrink together with the presser sheet 20A and the backsheet 20B by the elastic member 25 is the same in one body X and the other body Y, it becomes as shown in FIG. In the first embodiment shown in FIGS. 7B and 7C, since the elastic member 25 is not located in the boundary region straddling the boundary B, the contraction force does not act on the side seal portion 21. As a result, the contraction force due to the elastic member 25 only on the other body Y side acts on the side seal portion 21 so that the side seal portion 21 is laid down.

Also in the second embodiment shown in FIGS. 8A and 8B, the elastic member 25 is a plurality of thin members in the front-rear direction (direction passing through the drawing in FIG. 8), and the front body is formed by a hot melt adhesive. And it is being fixed to the sheet | seat which comprises a back body, and is integrated.
However, the elastic member 25 is not located in at least the boundary region of one body X.
That is, the elastic member 25 is a mode in which the elastic member 25 is not located in the entire area up to the side edges of the presser sheet 20A and the backsheet 20B in addition to the boundary region straddling the boundary B.
In this embodiment, for example, by adhering with the hot melt adhesive from the side edge to the boundary region of the press sheet 20A and the back sheet 20B, the side seal portion 21 is adjacent to the single disposable diaper in the manufacturing process. When the elastic member 25 of one body X contracts beyond the boundary region when the side seal portion 21 of the other disposable diaper is cut and separated, the elastic member 25 is at least in the boundary region of the one body X. Are not located.
Even in this case, the same mechanism of action as in the first embodiment occurs.

Also in the third embodiment shown in FIGS. 9 (a) and 9 (b), the elastic member 25 is a plurality of thin members in the front-rear direction (direction passing through the drawing in FIG. 9), and the front body is formed by hot melt adhesive. And it is being fixed to the sheet | seat which comprises a back body, and is integrated.
However, in at least the boundary region in the other body Y, the elastic member 25 is not integrated with at least one of the pair of sheets (press sheet 20A and back sheet 20B) on the wearer side (press sheet 20A). It is a form.
In this mode, (1) the elastic member 25 is not integrated with the presser sheet 20A over at least the boundary region (symbol γ in FIG. 9A), (2) or the presser sheet 20A and The aspect which is not integrated with respect to both of the back seat | sheets 20B is included.
As a means for preventing the integration, it can be mentioned that the hot-melt adhesive is not used. Or the chemical | medical agent which inhibits the exhibit of adhesive force to a boundary area | region etc. can also be mentioned.

According to the third embodiment, since the elastic member 25 is not integrated with at least one of the sheets on the wearer side (pressing sheet 20A), as shown in FIG. The elastic member 25 behaves so as to be linearized by the contraction force between the one end and the other end, and as a result, the side seal portion 21 behaves so as to fall down on the other body Y side. This is because the contraction force of the elastic member 25 on the other body Y side is greater than the contraction force of the elastic member 25 on the one body X side.
In the third embodiment, the same mechanism of action as in the first embodiment occurs.

If a thin and long member is used as the elastic member, or if sealing is intermittently performed in the front-rear direction, if the sealing process is performed with the elastic member positioned between the adjacent seal portions, the seal is caused by the contraction force of the elastic member. There is a risk that it will not be done or will come off the seal. Therefore, it is desirable that the sealing process is continuous in the front-rear direction.
In addition, since it is expected that the single seal portion is not stable in the front-rear direction, it is possible to form two rows of side seal portions in the width direction as in the above-mentioned prior patent documents 1 and 2.

In view of this point, the fourth embodiment shown in FIGS. 10 (a) and 10 (b) is an example of a comb-tooth side seal portion.
The elastic member 25 is provided at a seal portion 21A in which the outside of the side edge portion is continuous in the front-rear direction, the seal portion 21a in which the inside of the side edge portion is discontinuous in the front-rear direction, and the discontinuous portion between the seal portions 21a, 21a. Is located and reaches the outer side (seal part 21a) of the side edge part.

And regarding the elastic member 25, about L section between 21 A of seal parts, when adhesion | attachment by a hot-melt-adhesive agent is not performed, for example, between one end and the other end of L section over a part to a boundary region Thus, the elastic member 25 behaves so as to be linearized by its contraction force, and behaves so that the side seal portion 21 is laid down on the other body Y side.
In the fourth embodiment, the same mechanism of action as in the first embodiment occurs.

In the fourth embodiment, for example, the seal portion 21A is a joined portion by a hot melt adhesive, and the seal portion 21a can be a heat welded portion.
In addition, in this 4th Embodiment and 3rd Embodiment, when it combines with 1st Embodiment or 2nd Embodiment, there exists an advantage by which the body Y side overturn becomes clearer. is there.

  In the first to third embodiments, the form of the side seal portion can be the same as the disclosure examples of Patent Document 1 and Patent Document 2, and as shown in FIG. A combination of the intermittent seal portions 21C may be used.

Although the said example is an example of a thin long member as an elastic member, the elastic film which expands-contracts at least in the width direction which occupies a certain area can also be used.
Even when an elastic film is used, it will be apparent that the object of the present invention can be achieved by a similar configuration in the case of a thin and long member.
In addition, as an example of joining in the case of using an elastic (elastomer) film, in addition to using a hot-melt adhesive, it is too hard to join the hot-melt adhesive, so that welding at many points, for example, thermal welding or ultrasonic waves This is possible by welding.
Examples of this type of welded joint include Japanese Patent Publication No. 10-509337, Japanese Patent No. 3249530, Japanese Patent No. 3675676, WO 2008/126708 A1, Japanese Patent No. 4508885, Japanese Patent No. 4934835, Japanese Patent No. 5028654, Japanese Patent Laid-Open No. 20132864. -128575, patent 5183488, patent 5073725, etc. can be mentioned.
Therefore, illustration explanation by a specific example is omitted.

  The present invention can be used for a pants-type disposable product as in the above example.

  B ... Rear body, BS ... Solid gather, F ... Front body, 10 ... Interior body, 11 ... Top sheet, 12 ... Liquid-impermeable back side sheet, 13 ... Absorber, 15 ... Solid gather sheet, 16 ... Solid gather Elastic member, 20 ... exterior body, 20A ... presser sheet, 20B ... back sheet, 20C ... folded portion, 21 ... side seal part, 21A-21C, 21a, 21b ... seal part, 24 ... waist elastic member, 25 ... waist Lower part elastic member, 26, 28 ... curved elastic member, 27 ... leg opening elastic member, T ... trunk circumference part, L ... leg opening part, W ... waist part, U ... waist lower part.

  The present invention relates to a pants-type disposable product such as a pants-type disposable diaper.

  The pants-type disposable diaper includes an exterior body that individually or integrally configures the front body and the back body, and an interior body including an absorbent body that is attached to the inner surface of the exterior body so as to extend from the front body to the back body. Generally, a waist opening and a pair of left and right leg openings are formed by joining the side edges of the outer body of the front body and the side edges of the outer body of the rear body to form a side seal part. Is. Moreover, in a pants type disposable diaper, in order to improve fit property, it is common to provide elastic members, such as a rubber thread, in a leg periphery part and a trunk periphery part, for example.

  Several proposals have been made regarding the side seal portion (Patent Documents 1 and 2). All of these are devised with respect to the form of the side seal part itself in order to prevent it from falling off and being fixed by the contraction force of the elastic member.

On the other hand, as will be described later with reference to the drawings, including the example of the patent document, the contraction force of the elastic member of the front body and the contraction force of the elastic member of the back body balance the side seal portion. The side seal part at the time of wearing will become a form which protrudes in the direction away from a wearer generally.
The side seal portion is a hard portion as compared with other portions because the material is compressed in a superposed state.

Therefore, on the wearer side where the widthwise end portions of the front body and the back body face the side seal portion, there is a tendency that the rigidity is higher than other inner surface regions, and the wearer's skin may be uncomfortable.
In addition, the side seal portion tends to radially protrude from the wearer, which may give an uncomfortable feeling when touched with a hand.

JP2013-128575A JP 2000-279444 A

  Then, the main subject of this invention is providing the underpants type disposable product which reduces or eliminates the uncomfortable feeling by a side seal part.

The present invention that has solved the above problems
The front and rear body side edges are arranged between a pair of seats and fixed with a stretchable member that gives a stretching force in the width direction. In pants-type disposable products with openings formed,
The elastic member extends to the side edge in the width direction of the side seal part in both the front body and the back body,
In the boundary region straddling at least the boundary with the side seal part in one body of the front body or the back body, the contraction force of the elastic member is weak or not exerted, and in the boundary region in the other body, the elasticity It is a structure that exerts a strong contraction force of the member,
A pants-type disposable product characterized by that.

In one body, at least in the boundary region straddling the boundary with the side seal portion, the elastic member has a weak contraction force or does not exhibit the elasticity. In the other boundary region, the elastic member exhibits a strong contraction force. When it is the structure to do, a side seal part shows the tendency which falls to the other body part.
As a result, the uncomfortable feeling due to the side seal portion is reduced.

The elastic member is a plurality of thin members (e.g., rubber thread) in the front-rear direction, and is fixed to a sheet constituting the front body and the back body by a hot melt adhesive, in the boundary region in the other body,
When the elastic member is not integrated with at least one of the pair of sheets on the wearer side, the side seal portion tends to fall on the other body.

  As an example in the above embodiment, in the side seal portion, the outside of the side edge portion is continuous in the front-rear direction, and the inside of the side edge portion is discontinuous in the front-rear direction. In the aspect in which the member is located and reaches the outside of the side edge portion, the side seal portion tends to fall on the other body.

The elastic member is a plurality of thin members in the front-rear direction, and is fixed to a sheet constituting the front body and the back body by a hot melt adhesive, at least in the boundary region in the one body,
Even if the elastic member is not positioned, the side seal portion tends to fall on the other body.

The elastic member which expands / contracts in the width direction may be sufficient as the said elastic member of a front body and a back body.
This elastic film is fixed to a sheet constituting the front body and the back body, and is not fixed to one of the pair of sheets on the wearer side in the boundary region of the other body. be able to.

The elastic member of the front body and the back body is an elastic film that expands and contracts in the width direction, and is fixed to a sheet constituting the front body and the back body, at least in the boundary region of the other body, the elastic member is It can be set as the aspect which is not integrated with each of a pair of said sheet | seat.

  Under the form that is not integrated with each of the pair of sheets, in the first place, the elastic member is not located at least in the boundary region, so that it is not integrated with each of the pair of sheets. Also good.

  As described above, according to the present invention, the uncomfortable feeling caused by the side seal portion is reduced or eliminated.

It is a top view (inner surface side) of the underpants type disposable diaper of a deployment state. It is a top view (outer surface side) of the underpants type disposable diaper of a deployment state. It is CC sectional drawing of FIG. It is AA sectional drawing of FIG. It is BB sectional drawing of FIG. It is a perspective view of the wearing state of a pants type disposable diaper. The example of a side seal part is illustrated schematically, (a) is a conventional example, (b) is a conceptual cross-sectional view of the first embodiment in an unfolded state, and (c) is a side seal part is lying down. It is a conceptual sectional view of the state which is carrying out. (A) is conceptual sectional drawing of the state which does not fall down of reference embodiment, (b) is a conceptual sectional drawing of the state in which the side seal part is lying down. (A) is a conceptual sectional view of the second embodiment in a state where it does not fall down, and (b) is a conceptual sectional view of a state in which the side seal portion is lying down. (A) is a principal part top view of the side seal part of 3rd Embodiment, (b) is a conceptual sectional drawing of the state in which the side seal part is lying down. It is a principal part top view of the other example of a side seal part.

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%. Moreover, the fine dot pattern part in a figure has shown that joining means, such as a hot-melt-adhesive, exists.
1-6 has shown an example of the underpants type disposable diaper. This pants-type disposable diaper (hereinafter also simply referred to as a diaper) has an outer body 20 that integrally constitutes a front body F and a rear body B, and an inner surface of the outer body 20 so as to extend from the front body F to the rear body B. The interior body 10 has a fixed interior body 10 in which an absorber 13 is interposed between a liquid-permeable top sheet 11 and a liquid-impermeable back sheet 12.
For example, at the time of manufacture, after the back surface of the interior body 10 is joined to the inner surface (upper surface) of the exterior body 20 by a joining means such as a hot-melt adhesive (dotted portion in FIG. 2), the interior body 10 and the exterior The body 20 is folded at the center in the front-rear direction (vertical direction), which is the boundary between the front body F and the back body B, and both side portions thereof are joined to each other by heat welding or hot melt adhesive to form the side seal portion 21. By doing so, a pants-type disposable diaper having a waist opening and a pair of left and right leg openings is formed.

(Structural example of interior body)
As shown in FIGS. 3 to 5, for example, the interior body 10 includes an absorbent body 13 between a liquid-permeable top sheet 11 made of a nonwoven fabric and the like and a liquid-impermeable back side sheet 12 made of polyethylene or the like. It has an intervening structure and absorbs and retains excretory fluid that has passed through the top sheet 11. Although the planar shape of the interior body 10 is not particularly limited, it is generally a substantially rectangular shape as illustrated.

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

  As the liquid-impermeable back sheet 12 that covers the back surface side (non-skin contact surface side) of the absorbent body 13, a liquid-impermeable plastic sheet such as polyethylene or polypropylene is used. Those having wettability are preferably used. This water-impervious / breathable sheet is a microporous sheet obtained by, for example, melt-kneading an inorganic filler in an olefin resin such as polyethylene or polypropylene to form a sheet, and then stretching in a uniaxial or biaxial direction. is there.

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

  The overall shape of the absorbent body 13 is formed in a substantially hourglass shape having a narrowed portion 13N having a narrower width than the front and rear sides at the crotch portion, but may have an appropriate shape such as a rectangular shape. Although the size of the constricted portion 13N can be determined as appropriate, the length in the front-rear direction of the constricted portion 13N can be about 20 to 50% of the total length of the diaper, and the width of the narrowest portion is 40% of the total width of the absorber 13. It can be about -60%. In the case where the constricted portion 13N is provided, if the planar shape of the interior body 10 is substantially rectangular, the remainder of the interior body 10 that does not include the absorber 13 in the portion corresponding to the constricted portion 13N of the absorber 13. A part is formed.

  In the illustrated form, solid gather BSs that fit around the legs are formed on both sides of the interior body 10. As shown in FIGS. 4 and 5, the three-dimensional gather BS includes a fixed portion fixed to a side portion on the back surface of the interior body, and a side portion on the surface of the interior body from the fixed portion through the side of the interior body. The body part that extends to the front, the front and rear ends of the body part in a lying state, and the lying part that is fixed to the side of the surface of the interior body, and the freedom part that is formed with this lying part being unfixed The part is formed by a three-dimensional gathered sheet 15 which is a double sheet by folding. As the three-dimensional gather sheet 15, a non-woven fabric having water repellency is preferably used.

  In addition, an elongated three-dimensional gathered elastic member 16 is disposed between the sheets of the double sheet at the tip of the free part. In the product state, the three-dimensional gather elastic member 16 is for forming a three-dimensional gather BS by erecting a free part protruding from the absorber side edge portion by elastic stretching force as shown by a two-dot chain line in FIG.

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

  As the gathered elastic member 16, materials such as styrene rubber, olefin rubber, urethane rubber, ester rubber, polyurethane, polyethylene, polystyrene, styrene butadiene, silicon, and polyester that are usually used can be used. Further, in order to make it difficult to see from the outside, it is preferable that the thickness is 925 dtex or less, the tension is 150 to 350%, and the interval is 10.0 mm or less. The gathered elastic member 16 may be a tape-like member having a certain width in addition to the thread-like shape shown in the figure.

  In the same manner as the liquid-permeable surface sheet 11, the material fibers constituting the three-dimensional gather sheet 15 are olefin-based, such as polyethylene or polypropylene, polyester-based, amide-based synthetic fibers, regenerated fibers such as rayon and cupra, Non-woven fabric obtained by an appropriate processing method such as a spunbond method, a thermal bond method, a melt blown method, a needle punch method, etc. can be used. It is preferable to use a non-woven fabric with a low basis weight and excellent air permeability. Furthermore, with respect to the three-dimensional gather sheet 15, in order to prevent the transmission of urine and the like, to prevent fogging, and to improve the touch to the skin (dry feeling), a silicon-based, paraffin metal-based, alkylchromic chromoid-based water repellent It is desirable to use a water-repellent non-woven fabric coated with such as.

(External body structure example)
The exterior body 20 has a part constituting the front body F extending from the center in the front-rear direction to the ventral side and a part constituting the back body B extending from the center in the front-rear direction to the back side. The side seal part 21 is formed by joining both side parts of the back body B and the both sides of the back body B, and as shown in FIG. 6, a pair of left and right sides for passing the waist opening and legs for passing the wearer's torso Leg openings are formed.

  The exterior body 20 includes a waist portion T defined as a longitudinal range (a longitudinal range extending from the waist opening to the upper end of the leg opening) having the side seal portion 21, and a longitudinal range (front body F) of a portion forming the leg opening. Leg opening L defined as a vertical region having the side seal portion 21 and a vertical region having the side seal portion 21 of the back body B. The waistline portion T can be divided into a waist portion W that conceptually forms an edge portion of the waist opening and a waist lower portion U that is a lower portion than this. Usually, when there is a boundary (for example, the thickness or elongation rate of the elastic stretchable member changes) in the waist circumference portion T, the waist opening side is the waist portion W from the most waist opening side boundary. When there is no such boundary, the waist opening side becomes the waist portion W from the absorber 13 or the interior body 10.

  As shown in FIGS. 4 to 6, the exterior body 20 has a two-layer structure including a press sheet 20 </ b> A and a back sheet 20 </ b> B each made of a nonwoven fabric or the like, between the press sheet 20 </ b> A and the back sheet 20 </ b> B, and the back Various elastic members are disposed between the nonwoven fabrics of the folded portion 20C formed by folding the sheet 20B to the inner surface side at the waist opening edge, and elasticity is imparted. The planar shape has a pseudo hourglass shape as a whole by the concave leg surrounding lines 29 formed to form leg openings on both sides of the middle.

  In the front body F and the back body B, the exterior body 20 in the illustrated form includes a waist elastic member 24 disposed in the waist W as an elastic member along the width direction, and a waist lower part disposed in the waist lower part U. In addition to the leg elastic member 25 and the leg opening elastic member 27 disposed in the leg opening L, separately from these, the side seal part 21 extends while curving in a pattern toward the crotch portion along the monopod opening. The curved elastic members 26 and 28 are provided. These elastic members 24 to 28 are fixed in a state of being stretched at a predetermined stretch rate along their extending directions. In addition, in this exterior body 20, what is called a leg periphery elastic member which continues from the side seal part of the front body F to the side seal part of the back body B along the leg periphery line 29 is not provided.

  The waist elastic member 24 is for tightening the wearer's waist with elasticity. In the illustrated example, the elastic member 24 is an elongated elastic member such as rubber thread attached in an extended state along the width direction between the layers in the waist W. A plurality of lines are provided at intervals in the vertical direction. For the waist elastic member 24, rubber thread is used in the illustrated example. However, for example, a tape-like elastic member may be used. Moreover, although the waist part elastic member 24 of the illustration form is clamped between the nonwoven fabrics of the folding | returning part 20C of the back sheet 20B in a waist part, you may clamp between 20 A of pressing sheets, and the back sheet 20B. The waist elastic member 24 is desirably provided over the entire width direction of the waist W.

  The waist lower part elastic member 25 is for attaching the diaper to the lower abdomen and the buttocks of the wearer with elasticity, and in the illustrated example, is attached in an extended state along the width direction between the layers in the waist lower part U. It is an elongated elastic member such as rubber thread, and a plurality of elastic members are provided at intervals in the vertical direction. It is desirable that the waist lower part elastic member 25 is provided on both sides in the width direction of the intermediate part in the width direction of the absorber in the waist lower part U, and the side edges are provided up to the side seal part 21.

  The leg opening elastic member 27 is mainly for giving a stretchability in the width direction to a portion along the leg opening. In the illustrated example, the leg opening elastic member 27 is attached in an extended state along the width direction between the layers in the leg opening L. A plurality of elastic members such as rubber thread are provided, and a plurality of elastic members are provided at intervals in the vertical direction. It is desirable that the leg opening elastic member 27 is provided at least on both sides in the width direction of the intermediate part in the width direction of the absorber of the leg opening L, and the side edge is provided up to the leg opening edge 29.

In the form shown in the figure, in the range from the waist portion T to the leg opening L in the exterior body 20, apart from the waist elastic member 24, the waist lower elastic member 25, and the leg opening elastic member 27, thread rubber, etc. Curved elastic members 26 and 28 made of a long and slender elastic member are arranged along a predetermined curve. The number of the curved elastic members 26 and 28 may be one, but it is preferable that they are plural. In the illustrated example, the curved elastic members 26 and 28 are elongated elastic members such as four rubber threads. They are arranged at intervals without crossing each other. The curved elastic members 26 and 28 are arranged in a bundle of about two or three elastic members with a close interval, and 3 to 20 mm, preferably 6 to form a predetermined stretch zone. Three or more, preferably four or more are arranged with an interval of about ˜16 mm.
The leg opening elastic member 27 is provided with the curved elastic members 26 and 28 as necessary, and may not have these.

  The exterior body 20 mentioned above can be manufactured by the technique of Unexamined-Japanese-Patent No. 4-28363 or Unexamined-Japanese-Patent No. 11-332913, for example. Moreover, in order to cut | disconnect the curved elastic members 26 and 28 on the interior body 10, it describes in Unexamined-Japanese-Patent No. 2002-35029, Unexamined-Japanese-Patent No. 2002-178428, and Unexamined-Japanese-Patent No. 2002-273808. A cutting method is preferably employed.

  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. When the curved elastic members 26 and 28 are provided on both the front body F and the back body B, a part or all of the group of the curved elastic members 28 disposed on the front body F side and the back body B side are disposed. Although a form (not shown) in which a part or all of the group of curved elastic members 26 formed can be adopted, the group of curved elastic members 28 arranged on the front body F side as shown in the example, A configuration in which the curved elastic members 26 arranged on the back body B side are separated from each other in the longitudinal direction at a position slightly deviated from the front-rear direction intermediate portion, particularly the front body F without crossing each other.

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

  Although the elongation rate at the time of attachment of the elastic members 24 to 28 can be determined as appropriate, in the case of a normal adult, the waist elastic member 24 is about 160 to 320%, the waist lower elastic member 25 and the leg opening elastic member. 27 may be approximately 160 to 320%, and the curved elastic members 26 and 28 may be approximately 230 to 320%.

(Front / rear presser sheet)
As shown in FIGS. 1 and 4, in order to cover the front and rear end portions 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. The illustrated embodiment will be described 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 waist side end portion to the position overlapping the front end portion of the interior body 10 in the inner surface of the front body F. The rear presser sheet 60 extends across the entire width direction from the inner surface of the folded portion 20C at the end on the waist side to the position overlapping the rear end of the interior body 10 in the inner surface of the back body B. If a slight non-adhesive portion is provided in the crotch side edges of the front and rear presser sheets 50, 60 over the entire width direction (or only the central portion), not only the adhesive does not stick out, but also this portion is removed from the surface sheet. It can be lifted slightly to function as a leak-proof wall.

  When the front and rear presser sheets 50 and 60 are attached as shown in the figure, there is an advantage that the degree of freedom of material selection is increased, but there are also disadvantages such as an increase in materials and manufacturing processes. Therefore, the folded portion 20C formed by folding the exterior body 20 on the inner surface of the diaper can be extended to a portion overlapping the interior body 10 to form a portion equivalent to the presser sheets 50 and 60 described above.

The pulling elastic member 30 is excellent in the pulling effect when it extends to a position overlapping the side portion of the absorber 13, but even if it coincides with the side edge of the absorber 13 or is separated from the side edge. good.
The contraction force by the pulling elastic member 30 may be the same as the contraction force of other elastic members (in the illustrated embodiment, the waist lower part elastic member 25 (corresponding to the basic elastic member)). It is preferable that the exterior body 20 fits the waist lower part elastic member 25 and the leg opening elastic member 27 more securely. The contraction force means a value at the same elongation rate, and can be varied by a known method such as the type of elastic member, the elongation rate at the time of attachment, and the thickness.

(Other)
In the above example, the front body F to the back body B are continuously covered by the integrated exterior body 12, but the exterior body is divided into those constituting the front body F and those constituting the back body B. The outer body of the front body F and the outer body of the rear body B are not continuous on the crotch side and can be separated (not shown). In this case, the outer body of the front body has at least a portion that overlaps with the vertically stretchable portion, portions on both sides in the width direction, and portions on the waist opening side. Moreover, the back surface of the interior body can be covered with a crotch outer body such as a nonwoven fabric.

<About side seal part>
The present invention is arranged between a pair of seats and integrated with a stretch member that gives stretch force in the width direction, both side edges of the front body and the back body have side seal portions by mutual joining, and a waist opening In addition, the present invention relates to a pants-type disposable product in which a pair of left and right leg openings are formed, and in particular, the structure around the side seal portion is devised.

The pants-type disposable product of the present invention is intended for a product in which a waist opening and a pair of left and right leg openings are formed, and both side edges of the front body and the back body have side seal portions formed by mutual bonding.
Therefore, in addition to a pants-type disposable diaper for use in receiving and absorbing body fluids, for example, disposable pants may be used.

  For example, FIG. 7 to FIG. 10 in a state where both side edges of the front body F and the back body B of FIG. 1 and FIG. 2 are joined to each other and the side seal portion 21 shown in FIG. An example of the structure around the side seal portion of the present invention will be described with reference to FIG.

  According to the present invention, as shown in FIGS. 7B and 7C, the contraction force of the elastic member is at least in the boundary region straddling the boundary B with the side seal portion in one of the front body and the back body. A pants-type disposable product is provided that has a structure in which the elastic member exerts a strong contraction force in the boundary region in the other body.

First Embodiment shown in FIGS. 7B and 7C, Reference Embodiment shown in FIGS. 8A and 8B Second Embodiment shown in FIGS. 9A and 9B, FIG. In any of the third embodiments shown in 10 (a) and 10 (b), at least the side seal portion in one body X (the body on the left side in the drawing) X of the front body or the back body In the boundary region straddling the boundary B of the elastic member, the contraction force of the elastic member is weak or not exerted, and in the boundary region in the other body (the right body on the drawing) Y, is the contraction force of the elastic member strong? It is a structure that demonstrates it.

  As an example of the elastic member in the side seal portion 21 in the present invention, there are a plurality of thin members (for example, rubber thread) in the front-rear direction. In the above-described pants-type disposable diaper, the waist elastic member 24, the waist lower portion The elastic member 25, the leg opening elastic member 27, and the curved elastic members 26 and 28 are targeted, but the elastic member 25 is illustrated for the sake of simplicity.

In the conventional example, the contraction force of the elastic member in one body X and the contraction force of the elastic member in the other body Y are the same as those in the embodiment. Therefore, as shown in FIG. The part 21 comes to stand almost orthogonally.
As a result, the compressive force of the elastic member 25 of the body X and the elastic member 25 of the body Y concentrates on the wearer's region Z corresponding to the width region sandwiching the boundary B, and the compression force by the highly rigid side seal portion 21. Acts to give the wearer an uncomfortable feeling due to the side seal portion 21.
Moreover, when the side seal part 21 stands up, when touching the surface of a disposable diaper so that it may touch, it also gives the sense of incongruity as a protrusion. It also gives an uncomfortable appearance.

  On the other hand, as shown in FIG. 7 (c), when the side seal part 21 is laid down on the other body Y side, the highly rigid side seal part 21 is in a laid down state. The discomfort caused by the side seal portion 21 is eliminated or reduced.

In the first embodiment shown in FIGS. 7B and 7C, the elastic member 25 is a plurality of thin members in the front-rear direction (direction passing through the drawing in FIG. 7). It is being fixed to the sheet | seat which comprises a back body, and the said elastic member 25 is the aspect which is not located in the boundary area | region in said one body X at least.
That is, the elastic member 25 is not located in the boundary region straddling the boundary B. In this case, in one body X, the elastic member 25 tends to contract together with the presser sheet 20A and the back sheet 20B in the width direction of the product (left and right direction in the drawing).
If the force to shrink together with the presser sheet 20A and the backsheet 20B by the elastic member 25 is the same in one body X and the other body Y, it becomes as shown in FIG. In the first embodiment shown in FIGS. 7B and 7C, since the elastic member 25 is not located in the boundary region straddling the boundary B, the contraction force does not act on the side seal portion 21. As a result, the contraction force due to the elastic member 25 only on the other body Y side acts on the side seal portion 21 so that the side seal portion 21 is laid down.

Also in the reference embodiment shown in FIGS. 8A and 8B, the elastic member 25 is a plurality of thin members in the front-rear direction (direction passing through the drawing in FIG. 8). It is fixed to the seat that forms the back body.
However, the elastic member 25 is not located in at least the boundary region of one body X.
That is, the elastic member 25 is a mode in which the elastic member 25 is not located in the entire area up to the side edges of the presser sheet 20A and the backsheet 20B in addition to the boundary region straddling the boundary B.
In this embodiment, for example, by adhering with the hot melt adhesive from the side edge to the boundary region of the press sheet 20A and the back sheet 20B, the side seal portion 21 is adjacent to the single disposable diaper in the manufacturing process. When the elastic member 25 of one body X contracts beyond the boundary region when the side seal portion 21 of the other disposable diaper is cut and separated, the elastic member 25 is at least in the boundary region of the one body X. Are not located.
Even in this case, the same mechanism of action as in the first embodiment occurs.

Also in the second embodiment shown in FIGS. 9A and 9B, the elastic member 25 is a plurality of thin members in the front-rear direction (direction passing through the drawing in FIG. 9), and the front body is made of hot melt adhesive. And it is being fixed to the sheet | seat which comprises a back body.
However, in at least the boundary region in the other body Y, the elastic member 25 is not integrated with at least one of the pair of sheets (press sheet 20A and back sheet 20B) on the wearer side (press sheet 20A). It is a form.
In this mode, (1) the elastic member 25 is not integrated with the presser sheet 20A over at least the boundary region (symbol γ in FIG. 9A), (2) or the presser sheet 20A and The aspect which is not integrated with respect to both of the back seat | sheets 20B is included.
As a means for preventing the integration, it can be mentioned that the hot-melt adhesive is not used. Or the chemical | medical agent which inhibits the exhibit of adhesive force to a boundary area | region etc. can also be mentioned.

According to the second embodiment, the elastic member 25 is not integrated with at least one of the sheets on the wearer's side (presser sheet 20A). The elastic member 25 behaves so as to be linearized by the contraction force between the one end and the other end, and as a result, the side seal portion 21 behaves so as to fall down on the other body Y side. This is because the contraction force of the elastic member 25 on the other body Y side is greater than the contraction force of the elastic member 25 on the one body X side.
In the second embodiment, the same mechanism of action as in the first embodiment occurs.

If a thin and long member is used as the elastic member, or if sealing is intermittently performed in the front-rear direction, if the sealing process is performed with the elastic member positioned between the adjacent seal portions, the seal is caused by the contraction force of the elastic member. There is a risk that it will not be done or will come off the seal. Therefore, it is desirable that the sealing process is continuous in the front-rear direction.
In addition, since it is expected that the single seal portion is not stable in the front-rear direction, it is possible to form two rows of side seal portions in the width direction as in the above-mentioned prior patent documents 1 and 2.

In view of this point, the third embodiment shown in FIGS. 10 (a) and 10 (b) is an example of a comb-tooth side seal portion.
The elastic member 25 is provided at a seal portion 21A in which the outside of the side edge portion is continuous in the front-rear direction, the seal portion 21a in which the inside of the side edge portion is discontinuous in the front-rear direction, and the discontinuous portion between the seal portions 21a, 21a. Is located and reaches the outer side (seal part 21a) of the side edge part.

And regarding the elastic member 25, about L section between 21 A of seal parts, when adhesion | attachment by a hot-melt-adhesive agent is not performed, for example, between one end and the other end of L section over a part to a boundary region Thus, the elastic member 25 behaves so as to be linearized by its contraction force, and behaves so that the side seal portion 21 is laid down on the other body Y side.
In the third embodiment, the same mechanism of action as in the first embodiment occurs.

In the third embodiment, for example, the seal portion 21A is a joined portion by a hot melt adhesive, and the seal portion 21a can be a heat welded portion.
In addition, in this 3rd Embodiment and 2nd Embodiment, when it combines with the thing of 1st Embodiment or reference embodiment, there exists an advantage by which the body Y side overturn becomes clearer. is there.

In the first to second embodiments, the side seal portion can be formed in the same manner as the disclosure examples of Patent Document 1 and Patent Document 2, and as shown in FIG. A combination of the intermittent seal portions 21C may be used.

Although the said example is an example of a thin long member as an elastic member, the elastic film which expands-contracts at least in the width direction which occupies a certain area can also be used.
Even when an elastic film is used, it will be apparent that the object of the present invention can be achieved by a similar configuration in the case of a thin and long member.
In addition, as an example of joining in the case of using an elastic (elastomer) film, in addition to using a hot-melt adhesive, it is too hard to join the hot-melt adhesive, so that welding at many points, for example, thermal welding or ultrasonic waves This is possible by welding.
Examples of this type of welded joint include Japanese Patent Publication No. 10-509337, Japanese Patent No. 3249530, Japanese Patent No. 3675676, WO 2008/126708 A1, Japanese Patent No. 4508885, Japanese Patent No. 4934835, Japanese Patent No. 5028654, Japanese Patent Laid-Open No. 20132864. -128575, patent 5183488, patent 5073725, etc. can be mentioned.
Therefore, illustration explanation by a specific example is omitted.

  The present invention can be used for a pants-type disposable product as in the above example.

  B ... Rear body, BS ... Solid gather, F ... Front body, 10 ... Interior body, 11 ... Top sheet, 12 ... Liquid-impermeable back side sheet, 13 ... Absorber, 15 ... Solid gather sheet, 16 ... Solid gather Elastic member, 20 ... exterior body, 20A ... presser sheet, 20B ... back sheet, 20C ... folded portion, 21 ... side seal part, 21A-21C, 21a, 21b ... seal part, 24 ... waist elastic member, 25 ... waist Lower part elastic member, 26, 28 ... curved elastic member, 27 ... leg opening elastic member, T ... trunk circumference part, L ... leg opening part, W ... waist part, U ... waist lower part.

Claims (7)

A stretchable member disposed between a pair of seats and integrated with a stretchable member that gives stretchable force in the width direction, both side edges of the front body and the backbody have side seal portions by mutual joining, a waist opening and a pair of left and right In pants-type disposable products with leg openings formed,
In the boundary region straddling at least the boundary with the side seal part in one body of the front body or the back body, the contraction force of the elastic member is weak or not exerted, and in the boundary region in the other body, the elasticity A pants-type disposable product characterized by having a structure in which the contraction force of the member is strong or exerted. The elastic member is a plurality of thin members in the front-rear direction, and is fixed and integrated with a sheet constituting the front body and the back body by a hot melt adhesive, in the boundary region in the other body,
The pants-type disposable product according to claim 1, wherein the elastic member is not integrated with at least one of the pair of sheets on the wearer side.   In the side seal portion, the outside of the side edge portion is continuous in the front-rear direction, the inside of the side edge portion is discontinuous in the front-rear direction, and a plurality of elastic members are located at this discontinuous portion position, The pants-type disposable product according to claim 2, which reaches the outside of the side edge. The elastic member is a plurality of thin members in the front-rear direction, fixed and integrated with the sheet constituting the front body and the back body by a hot melt adhesive, at least in the boundary region in the one body,
The pants-type disposable product according to claim 1, wherein the elastic member is not located. The elastic member of the front body and the back body is an elastic film that expands and contracts in the width direction, and is fixed to and integrated with the sheet constituting the front body and the back body, in the boundary region in the other body,
The pants-type disposable product according to claim 1, wherein the elastic member is not integrated with one of the pair of sheets on the wearer side. The elastic member of the front body and the back body is an elastic film that expands and contracts in the width direction, and is fixed and integrated with a sheet constituting the front body and the back body, at least in the boundary region in the other body,
The pants-type disposable product according to claim 1, wherein the elastic member is not integrated with each of the pair of sheets.   The pants-type disposable product according to claim 6, wherein the elastic member is not located at least in the boundary region and is not integrated with each of the pair of sheets.

Images