JP6505897B2 - Pants type disposable product - Google Patents

Description

  The present invention relates to pant-type disposable products such as pant-type disposable diapers.

  The pants-type disposable diaper includes an outer body that individually or integrally configures a front body and a rear body, and an inner body including an absorber attached to the inner surface of the outer body so as to extend from the front body to the rear body. Generally, a waist opening and a pair of left and right leg openings are formed by forming a side seal portion 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. It is In addition, in the pants-type disposable diaper, in order to improve the fit, for example, it is common to provide an elastic member such as thread rubber on the leg surrounding part or the waist part.

  Several proposals have been made for the side seal portion (Patent Documents 1 and 2). All of these are devised with respect to the form of the side seal portion itself in order to prevent it from falling off and not being fixed due to the contraction force of the elastic member.

On the other hand, as will be described later with reference to the drawings, the side seal portion includes the contraction force of the elastic member of the front body and the contraction force of the elastic member of the rear body, including the example of the patent document. The side seal when worn is generally configured to protrude in the direction away from the wearer.
The side seal portion is a rigid portion as compared to the other portions because the material is compressed in an overlapping state.

Therefore, on the wearer's side where the widthwise end portions of the front and back bodies are directed to the side seal portion, the rigidity tends to be higher than the other inner surface area, which may cause the wearer's skin to feel uncomfortable.
In addition, since the side seal portion tends to protrude radially from the wearer, the user may feel discomfort when touching with a hand.

JP, 2013-128575, A JP 2000-279444 A

  Therefore, a main object of the present invention is to provide a pants-type disposable product in which the discomfort caused by the side seal portion is reduced or eliminated.

The pants-type disposable product of the present invention which solved the above-mentioned subject is:
Both side edges of the front body and the rear body have a side seal portion formed by joining them together, which is disposed between the pair of the seat on the wearer side and the back side and to which the stretchable member giving stretching force in the width direction is fixed In a pants-type disposable product having a waist opening and a pair of left and right leg openings,
The elastic member has a structure in which the contraction force of the elastic member does not exert at least in the boundary region across the boundary with the side seal portion in one of the front or back body, and in the boundary region of the other body, the elastic member It is characterized in that it has a structure that exerts a contraction force of
In the one body, the elastic member is not located in the entire border area across the border and the widthwise side edge of the side seal portion.

  It has a structure in which the contraction force of the elastic member is weak or not exhibited at least in the boundary region across the boundary with the side seal portion in one body, and the contraction force of the elastic member is strong in the boundary region in the other body The side seal portion has a tendency to fall down on the other body. As a result, the sense of discomfort due to the side seal portion is reduced.

  As described above, according to the present invention, the sense of discomfort 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 an unfolded state. It is a top view (outer surface side) of the underpants type disposable diaper of an unfolded 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. An example of a side seal portion is schematically illustrated, where (a) is a conventional example, (b) is a conceptual cross-sectional view of the first embodiment in the unfolded state, (c) is a side seal portion It is notional sectional drawing of the state which is doing. (A) is a conceptual cross-sectional view of the non-overlapping state of the second embodiment, and (b) is a conceptual cross-sectional view of the state where the side seal portion is collapsed. (A) is a conceptual cross-sectional view of the non-overlapping state of the third embodiment, and (b) is a conceptual cross-sectional view of the state where the side seal portion is collapsed. (A) is a principal part top view of the side seal part of 4th Embodiment, (b) is a conceptual sectional view of the state where the side seal part is lying down. It is a principal part top view of other examples of a side seal part.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the attached drawings. The term "extension rate" means a value when the natural length is 100%. Also, the fine dotted portions in the figure indicate that there is a bonding means such as a hot melt adhesive.
1 to 6 show an example of a pants-type disposable diaper. The pants-type disposable diaper (hereinafter, also simply referred to as a diaper) has an exterior body 20 integrally forming a front body F and a back body B, and an inner surface of the exterior body 20 so as to extend from the front body F to the back body B. The inner body 10 is formed by interposing the absorber 13 between the liquid-permeable surface sheet 11 and the liquid-impermeable back side sheet 12.
For example, at the time of manufacture, after the rear surface of the inner body 10 is joined to the inner surface (upper surface) of the outer body 20 by bonding means such as a hot melt adhesive (dotted portion in FIG. 2) Body 20 is folded at the center in the front-rear direction (longitudinal direction) which is the boundary between front body F and rear body B, and both side portions are mutually joined by heat welding or a hot melt adhesive or the like to form side seal portion 21. As a result, it becomes a pants-type disposable diaper in which a waist opening and a pair of left and right leg openings are formed.

(Example of the structure of the interior body)
For example, as shown in FIGS. 3 to 5, the inner body 10 has an absorbent body 13 between the liquid-permeable top sheet 11 made of non-woven fabric and the like and the liquid-impermeable back side sheet 12 made of polyethylene etc. It has an interposed structure, and absorbs and holds the excretory fluid that has permeated through the surface sheet 11. The planar shape of the inner body 10 is not particularly limited, but generally it is generally rectangular as illustrated.

  As the liquid-permeable surface sheet 11 which covers the surface side (skin contact surface side) of the absorber 13, a non-porous or non-porous non-woven fabric, a porous plastic sheet, or the like is suitably used. The material fibers constituting the non-woven fabric may be synthetic fibers of olefins such as polyethylene or polypropylene, polyesters, polyamides, etc., regenerated fibers such as rayon or cupra, or natural fibers such as cotton. Nonwoven fabrics obtained by an appropriate processing method such as a spun bond method, a thermal bond method, a meltblown method, a needle punch method or the like can be used. Among these processing methods, the spunlace method is excellent in flexibility and drapability, and the thermal bonding method is excellent in bulk and softness. 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 extends to the back side of the absorber 13 by winding the side edge portion of the absorber 13.

  The liquid-impervious back side sheet 12 covering the back side (non-skin contact side) of the absorbent 13 is made of a liquid-impervious plastic sheet such as polyethylene or polypropylene. Those having moisture are preferably used. This water-impervious and moisture-permeable 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 it in a uniaxial or biaxial direction. is there.

  The absorbent 13 is a known one, for example, a pile of pulp fibers, an aggregate of filaments such as cellulose acetate, or a non-woven fabric, and is formed by mixing and fixing a superabsorbent polymer as necessary. Can be used. The absorbent body 13 can be packaged by a packaging sheet 14 having liquid permeability and liquid holding property, such as crepe paper, as necessary, for shape and polymer holding.

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

  In the illustrated embodiment, solid gathers BS fitted around the legs are formed on both sides of the interior body 10. The solid gather BS, as shown in FIGS. 4 and 5, has a fixed portion fixed to the side of the back surface of the inner body, and a side portion of the surface of the inner body passing the side of the inner body from the fixed portion. Body extending to the bottom, a falling portion formed by fixing the front and rear ends of the main portion to the side of the surface of the interior body in a falling state, and a free portion formed by fixing the portion between the falling portions A part is formed of a solid gather sheet 15 which is a double sheet by folding back. As the three-dimensional gather sheet 15, a non-woven fabric made water repellent is suitably used.

  In addition, between the sheets of the double sheet, an elongated solid-gather elastic member 16 is disposed at the tip end portion of the free part or the like. The three-dimensional gather elastic member 16 is for forming a three-dimensional gather BS by raising a free part protruding from the edge portion of the absorbent body by an elastic stretching force as shown by a two-dot chain line in FIG. 4 in a product state.

  The liquid impermeable back side sheet 12 is folded back on the both sides in the width direction of the absorber 13 together with the liquid permeable top sheet 11. As this liquid-impervious back side sheet 12, it is desirable to use an opaque sheet so as to prevent browning such as defecation and urine. As the opacification, a film formed by internally adding a pigment such as calcium carbonate, titanium oxide, zinc oxide, white carbon, clay, talc, barium sulfate or the like into a plastic and using it as a film is preferably used.

  As the gather elastic member 16, materials such as styrene rubber, olefin rubber, urethane rubber, ester rubber, polyurethane, polyethylene, polystyrene, styrene butadiene, silicon, polyester, etc. which are usually used can be used. Moreover, in order to make it hard to see from the outside, it is preferable to arrange the thickness at 925 dtex or less, the tension at 150 to 350%, and the interval at 10.0 mm or less. As the gather elastic member 16, in addition to a thread as shown in the illustrated embodiment, a tape-like member having a certain width can also be used.

  Similarly to the liquid-permeable surface sheet 11, the material fibers constituting the above-mentioned three-dimensional gather sheet 15 are synthetic fibers such as olefins, polyesters and amides such as polyethylene or polypropylene, regenerated fibers such as rayon and cupra, It can be a natural fiber such as cotton, and non-woven fabric obtained by an appropriate processing method such as a spun bonding method, a thermal bonding method, a meltblown method, a needle punching method can be used. It is preferable to use a non-woven fabric excellent in breathability by reducing the basis weight. Furthermore, with regard to the three-dimensional gather sheet 15, in order to prevent the permeation of urine and the like, to prevent a rash, and to enhance the feel (dry feeling) to the skin, a silicon-based, paraffin-metal-based, alkylchromic croid-based water repellent It is desirable to use a water repellent treated non-woven fabric coated with

(Example of structure of exterior body)
The exterior body 20 has a portion forming a front body F extending from the center in the front-rear direction to the ventral side and a portion forming a back body B extending from the center in the front-rear direction to the back side. As shown in FIG. 6, a pair of left and right pairs for passing the waist opening for passing the trunk of the wearer and the legs as shown in FIG. Leg openings are formed.

  The exterior body 20 has a waist portion T defined as a longitudinal range (longitudinal range from the waist opening to the upper end of the leg opening) having the side seal portion 21 and a longitudinal range of a portion forming the leg opening (front body F And a leg opening portion L defined as between the longitudinal direction region having the side seal portion 21 of the back body B). The waist T can be divided into a waist W which conceptually forms an edge of a waist opening, and a lower waist U which is a lower portion. Generally, when there is a boundary in the waist portion T where the stretching stress in the width direction changes (for example, the thickness of the elastic member changes or the elongation rate changes), the waist opening W becomes the waist portion W than the boundary at the waist opening side When there is no such boundary, the waist opening side becomes the waist portion W more than the absorbent body 13 or the inner body 10.

  The exterior body 20 has a two-layer structure consisting of a holding sheet 20A and a back sheet 20B each made of a non-woven fabric or the like, as also shown in FIGS. 4 to 6, between the holding sheet 20A and the back sheet 20B, and 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 stretchability is imparted. The planar shape is generally in the shape of a pseudo hourglass due to the concave leg-surrounding lines 29 formed to form leg openings on both sides in the middle.

  The exterior body 20 in the illustrated embodiment is an elastic member along the width direction in each of the front body F and the back body B, and the waist elastic member 24 disposed in the waist W and the waist lower disposed in the waist lower portion U While having a part elastic member 25 and a leg opening elastic member 27 disposed in the leg opening L, separately from these, it extends while curving in a pattern toward the crotch part from the side seal part 21 along the one leg opening The curved elastic members 26, 28 are provided. Each of the elastic members 24 to 28 is fixed in a state of being stretched at a predetermined extension rate along the extending direction. In the present exterior body 20, no so-called elastic elastic member is provided which is continuous from the side seal portion of the front body F to the side seal portion of the rear body B along the leg circumference line 29.

  The waist elastic member 24 is used to tighten the waist of the wearer with elasticity, and in the illustrated example, an elongated elastic member such as a rubber thread attached in a stretched state along the width direction between the layers in the waist W It is assumed that a plurality of them are provided at intervals in the vertical direction. Although a rubber thread is used as the waist portion elastic member 24 in the illustrated example, a tape-like stretchable member may be used, for example. Although the waist elastic member 24 in the illustrated embodiment is held between the nonwoven fabrics of the folded portion 20C of the back sheet 20B in the waist portion, it may be held between the pressing sheet 20A and the back sheet 20B. It is desirable that the waist elastic member 24 be provided in the entire width direction of the waist W.

  The waist lower part elastic member 25 is for stretching the diaper in close contact with the lower abdomen and buttocks of the wearer, and in the illustrated example, is attached in a stretched state along the width direction between the layers in the waist lower part U A plurality of elongated elastic members such as thread rubber are provided at intervals in the longitudinal direction. The waist lower portion elastic member 25 is preferably provided at least on both sides in the width direction middle portion of the absorber in the waist lower portion U, and the side edge is provided up to the side seal portion 21.

  The leg opening elastic member 27 is mainly for giving stretchability in the width direction to a portion along the leg opening, and in the illustrated example, is attached in a stretched state along the width direction between the layers in the leg opening L A plurality of elongated elastic members such as rubber threads are provided, and a plurality of longitudinal elastic members are provided at intervals. The leg opening elastic members 27 are preferably provided at least on both sides in the width direction of the widthwise middle portion of the absorber among the leg openings L, and the side edges are provided up to the leg opening edge 29.

In the illustrated embodiment, in a range extending from the waist T to the leg opening L in the exterior body 20, a rubber thread or the like is separated from the waist elastic member 24, the waist lower elastic member 25, and the leg opening elastic member 27. Curved elastic members 26, 28 consisting of elongated elastic members are arranged along a predetermined curve. Each of the curved elastic members 26 and 28 may be one, but preferably two or more, and in the illustrated example, four elongated elastic members such as thread rubber, these curved elastic members 26 and 28 are They are spaced apart without crossing one another. The curved elastic members 26, 28 are disposed substantially as one bundle by closely spacing two or three elastic members, and 3 to 20 mm, preferably six, so as to form a predetermined expansion and contraction zone. Three or more, preferably four or more are disposed at intervals of about 16 mm.
The curved elastic members 26, 28 and the like are provided on the leg opening elastic member 27 as necessary, and they may not be provided.

  The exterior body 20 described above can be manufactured, for example, by the techniques described in JP-A-4-28363 and JP-A-11-332913. Moreover, in order to cut and make the curved elastic members 26 and 28 discontinuous on the interior body 10, they are described in JP-A-2002-35029, JP-A-2002-178428 and JP-A-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, they are disposed on the rear body B side with part or all of the group of the curved elastic members 28 disposed on the front body F side. Although a form (not shown) in which a part or all of the group of curved elastic members 26 intersects may be adopted, a group of curved elastic members 28 disposed on the front body F side as in the illustrated example; It is preferable that the groups of the curved elastic members 26 disposed on the rear body B side are separated in the longitudinal direction at a position slightly biased to the front-rear direction intermediate portion, in particular, the front body F without intersecting each other.

  Furthermore, the curved elastic members 26 and 28 may not be curved as a whole, and may have partially linear portions.

  Although the extension rate at the time of attachment of the elastic members 24 to 28 can be appropriately determined, in the case of ordinary adults, the waist elastic member 24 is about 160 to 320%, the lower waist elastic member 25 and the leg opening elastic member The thickness of the curved elastic members 26 and 28 can be about 230 to about 320%.

(Front and back presser sheet)
As also shown in FIGS. 1 and 4, in order to cover the front and rear end portions of the inner body 10 mounted on the inner surface of the outer body 20 and to prevent leakage from the front and rear edges of the inner body 10, 50, 60 may be provided. More specifically, the front pressing sheet 50 extends across the entire width from the inner surface of the folded portion 20C of the front end of the front body F to the front end of the inner body 10 in the front body F The back pressing sheet 60 extends over the entire width direction from the inner surface of the folded portion 20C of the waist end of the rear body B to a position overlapping the rear end of the inner body 10. If some non-adhered parts are provided on the crotch side edge of the front and back holding sheets 50 and 60 over the entire width direction (or only the central part), not only the adhesive will not come out, but also this part from the top sheet It can be floated a little to function as a leak barrier.

  If the front and rear pressing sheets 50 and 60 are separately attached as in the illustrated embodiment, there is an advantage that the degree of freedom in material selection is increased, but there are disadvantages such as an increase in materials and manufacturing processes. Therefore, it is possible to form a portion equivalent to the above-described pressing sheets 50 and 60 by extending a folded portion 20C formed by folding the exterior body 20 to the inner surface of the diaper to a portion overlapping the interior body 10.

The pull-up elastic member 30 is excellent in the pull-up effect when it extends to a position overlapping with the side portion of the absorber 13, but it may coincide with the side edge of the absorber 13 or be separated laterally from the side edge good.
The contraction force by the pulling-up elastic member 30 may be the same as the contraction force of other elastic members (in the illustrated embodiment, the waist lower portion elastic member 25 (corresponding to the basic elastic member)). In this case, the exterior body 20 is preferably fitted to the waist lower portion elastic member 25 and the leg opening elastic member 27 so as to fit tightly. In addition, contraction force means the value in the same elongation rate, and it can differ according to a well-known method, such as the kind of elastic member, the elongation rate at the time of attachment, and thickness.

(Others)
In the above example, the front body F to the rear body B are continuously covered by the integral outer package 12, but the outer body is divided into those constituting the front body F and those constituting the rear body B It is possible to adopt a form in which the exterior body of the front body F and the exterior body of the back body B are not continuous on the crotch side and are separated (not shown). In this case, the exterior body of the front body has at least a portion overlapping the longitudinal expansion and contraction portion, a portion on both sides in the width direction, and a portion on the waist opening side thereof. In addition, the back surface of the inner body can be covered with a crotch outer body such as non-woven fabric.

<About the side seal part>
According to the present invention, the front and rear body side edges of the front body and the rear body have the side seal portions formed by joining each other, which is disposed between the pair of sheets and to which the stretchable members for applying the stretching force in the width direction are fixed. 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, to devise a structure around a side seal portion.

The present invention is directed to a pants-type disposable product in which a waist opening and a pair of left and right leg openings are formed, and side edges of a front body and a rear body have side seals by mutual bonding.
Therefore, besides the pants-type disposable diaper in the application which receives and absorbs the body fluid, it may be, for example, disposable pants.

  For example, the side edges of the front body F and the back body B in FIGS. 1 and 2 are joined to each other, and the side seal portion 21 illustrated in FIG. 6 is viewed in cross section in FIGS. An exemplary 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), whether the contraction force of the elastic member is weak in at least the boundary region across the boundary Q with the side seal portion in one of the front or back body A pants-type disposable product is provided that has a structure that does not exert and the structure in which the elastic force of the elastic member exerts a strong force or exerts in the boundary region of the other body.

  First Embodiment Shown in FIGS. 7 (b) and (c) Second Embodiment Shown in FIGS. 8 (a) and 8 (b) Third Embodiment Shown in FIGS. 9 (a) and 9 (b) In any of the fourth embodiment shown in FIGS. 10 (a) and 10 (b), at least the side seal portion in one body (body on the left side in the drawing) X of the front or back body. The contraction force of the elastic member is weak or not exhibited in the boundary area across the boundary Q with the above, and the contraction force of the elastic member is strong in the boundary area of the other body (the body on the right side in the drawing) Y. It is a structure that demonstrates.

  As an example of the elastic member in the side seal part 21 in the present invention, it is a plurality of thin members (for example, thread rubber etc.) in the front and rear direction, and in the pants type disposable diaper of the above example Although the elastic member 25, the leg opening elastic member 27, and the curved elastic members 26, 28 are targeted, the elastic member 25 is illustrated for the sake of simplicity.

In the conventional example, since 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 in the embodiment, as shown in FIG. 7A, the side seal The parts 21 stand almost orthogonally.
As a result, by the contraction force of the elastic member 25 of the body X and the elastic member 25 of the body Y, the compression force by the side seal portion 21 having high rigidity is concentrated on the area Z of the wearer corresponding to the width area sandwiching the boundary Q. Acts to give the wearer a sense of discomfort due to the side seal portion 21.
Further, the fact that the side seal portion 21 stands up also gives a sense of incongruity as a protrusion when touching the surface of the disposable diaper in a stroke manner. It also gives a sense of discomfort.

  On the other hand, as shown in FIG. 7C, in the state where the side seal portion 21 lays down on the other body Y side, the side seal portion 21 with high rigidity is laid down, so the compression force is the wearer Therefore, the sense of incongruity caused by the side seal portion 21 is eliminated or reduced.

In the first embodiment shown in FIGS. 7 (b) and 7 (c), the elastic member 25 is a plurality of thin members in the front-rear direction (the direction passing through the drawing in FIG. 7). The elastic member 25 is not positioned in at least the boundary region of the one body X, which is fixed to and integrated with a sheet constituting the back body.
That is, the elastic member 25 is not located in the boundary area across the boundary Q. In this case, in one body X, the elastic member 25 shrinks 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 contract with the presser sheet 20A and the back sheet 20B by such an elastic member 25 is the same for one body X and the other body Y, it is as shown in FIG. 7A. In the first embodiment shown in FIGS. 7 (b) and 7 (c), since the elastic member 25 is not located in the boundary region straddling the boundary Q, the contraction force does not act on the side seal portion 21. As a result, the contraction force by the elastic member 25 only on the other body Y side acts on the side seal portion 21 and brings down the side seal portion 21.

Also in the second embodiment shown in FIGS. 8 (a) and 8 (b), the elastic member 25 is a plurality of thin members in the front-rear direction (the direction passing through the drawing in FIG. 8). And it is fixed and integrated to the sheet which constitutes the back body.
However, in at least the boundary region of one body X, the elastic member 25 is not located.
That is, the elastic member 25 is an aspect in which the elastic member 25 is not located in the entire region up to the side edges of the pressing sheet 20A and the back sheet 20B, in addition to the boundary region across the boundary Q.
This aspect adjoins the side seal portion 21 of one disposable diaper in the manufacturing process, for example, by not performing adhesion with a hot melt adhesive from the side edges of the presser sheet 20A and the back sheet 20B to the boundary area. The elastic member 25 of one body X shrinks beyond the boundary area when it is separated from the side seal portion 21 of the other disposable diaper. Is a mode that is not located.
Also in this case, the same action mechanism as that of 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 (the direction passing through the drawing in FIG. 9). And it is fixed and integrated to the sheet which constitutes the back body.
However, at least in the boundary region of the other body Y, the elastic member 25 is not integrated with at least one of the pair of sheets (the pressing sheet 20A and the back sheet 20B) on the wearer side (the pressing sheet 20A). It is a form.
In this aspect, (1) an aspect in which the elastic member 25 is not integrated with the holding sheet 20A at least over the boundary area (symbol γ in FIG. 9A), (2) or the holding sheet 20A and The aspect which is not integrated with both of back sheets 20B is included.
As a means which does not make it unify, mentioning that adhesion | attachment with a hot-melt adhesive is not performed can be mentioned. Alternatively, the application of a chemical that inhibits the exertion of adhesion to the boundary area can also be mentioned.

According to the third embodiment, the elastic member 25 is not integrated with at least one of the wearer's sheets (presser sheet 20A), so that the boundary region is partially formed as shown in FIG. 9 (b). Between the one end and the other end, the elastic member 25 behaves to straighten due to its contraction force, and as a result, the side seal portion 21 behaves so as to lie 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.
Also in the third embodiment, the same action mechanism as in the first embodiment occurs.

When using a thin and long member as an elastic member, if sealing is performed intermittently in the longitudinal direction, if sealing is performed with the elastic member positioned between the adjacent seal portions, the seal is formed by the contraction force of the elastic member. There is a risk that it will not be done or it will come off the seal. Therefore, it is desirable that the sealing process be continuous in the front-rear direction.
In addition, since it is expected that one seal part is not stable in the front-rear direction, the side seal parts can be formed in two rows 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 in which the side seal portion in the shape of a comb is used.
The elastic member 25 is disposed at the position of the discontinuous portion between the 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-back direction, and the seal portion 21a. Is positioned to reach the outer side (seal portion 21 a) of the side edge.

Then, regarding the elastic member 25 and the L section between the elastic member 25 and the seal portion 21A, for example, when bonding with the hot melt adhesive is not performed, between one end and the other end of the L section extending to the boundary region. Then, the elastic member 25 behaves to straighten due to its contraction force, and behaves such that the side seal portion 21 falls down on the other body Y side.
Also in the fourth embodiment, the same action mechanism as in the first embodiment occurs.

In the fourth embodiment, for example, the seal portion 21A may be a joint portion by a hot melt adhesive, and the seal portion 21a may be a heat welding portion.
In the fourth embodiment and the third embodiment, when combined with the first embodiment or the second embodiment, there is an advantage that the fall on the body Y side becomes clearer .

  In the first to third embodiments, the form of the side seal portion can be made similar to the disclosed examples of Patent Document 1 and Patent Document 2, and as shown in FIG. It may be a combination of the intermittent seal portion 21C.

Although the above-mentioned example is an example of a thin long member as an elastic member, an elastic film which expands and contracts at least in a width direction which occupies a certain area can also be used.
Even in the case of using an elastic film, it will be apparent that the object of the present invention can be achieved by the same form in the example of the thin long member.
In addition, as an example of joining when an elastic (elastomer) film is used, in addition to using a hot melt adhesive, since it becomes too hard in joining a hot melt adhesive, welding at many points, for example, thermal welding or ultrasonic waves It is possible by welding.
Examples of this type of welding and bonding are disclosed in Japanese Patent Application 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. -128575, patent 5183488, patent 5073725 etc. can be mentioned.
Therefore, the illustration and explanation according to the specific example will be omitted.

  The present invention can be applied to a pants-type disposable product as described above.

  B: back body, BS: solid gather, F: front body, 10: interior body, 11: surface sheet, 12: liquid impermeable back side sheet, 13: absorbent body, 15: solid gather sheet, 16: solid gather Elastic member, 20: exterior body, 20A: pressing sheet, 20B: back sheet, 20C: folded portion, 21: side seal portion, 21A to 21C, 21a, 21b: seal portion, 24: elastic portion of waist portion, 25: waist Lower part elastic members 26, 28: curved elastic members 27, 27 leg opening elastic members, T: waist part, L: leg openings, W: waist part, U: lower waist part.

Claims (1)

Is disposed between the wearer side and the back surface side of the pair of sheets, and the sheet elastic member of the pair providing an elastic force in the width direction is fixed by hot melt adhesive, both side edge portions of the front body and back body In a pants-type disposable product having side seals by mutual bonding, and having a waist opening and a pair of left and right leg openings,
Oite to one body of the front body or the back body, in addition to the area straddling the boundary between the side seal portion, in whole to the width direction side edge of the side seal part, not in the elastic member is located, It is a structure in which the contraction force of the elastic member is not exerted,
And the end by the side seal part side of the elastic member in the one body is a contracted part from the side seal part,
Oite the other body, in addition to the boundary region straddling the boundary between the side seal portion, wherein the total up to the width direction side edge of the side seal portion, and is fixed by hot melt adhesive to the elastic member is positioned A structure in which the contraction force of the elastic member is exerted in the boundary region of the other body
Pants type disposable product characterized by.

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