JP2013128575A - Absorbent article - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an absorbent article capable of inhibiting a flexible member arranged to a side joint from displacement or coming-off from the side joint.SOLUTION: An absorbent article 1 is a panty-type absorbent article has a pair of side joints formed in both end parts of front and rear waist areas in the width direction by joining the front and rear waist areas. The pair of the side joints has a first joint area in which a plurality of joints formed by joining the front and rear girth areas are formed at intervals in the front-back direction, and a second joint area arranged outside the first joint area in the width direction and lower in joint strength than the first joint area. The joint of the first joint area is arranged along the flexible member in a manner of sandwiching the flexible member, and the second joint area is arranged in a manner of overlapping with the flexible member.

Description

  The present invention relates to an absorbent article.

  Patent Document 1 describes an absorbent article including side joint portions obtained by joining right and left end portions of the front waistline region and outer end portions in the width direction of the rear waistline region. The absorbent article is joined by a side joint between the left end and the right end, so that a leg opening where the wearer's leg is inserted and a waist opening where the wearer's waist is inserted. It becomes the formed pants shape. The front and rear regions of the absorbent article are provided with stretchable members that expand and contract in the width direction.

Japanese Patent Laying-Open No. 2005-287663 (FIG. 1)

  The side joining portion of the above-described absorbent article is joined by a melting means composed of heat welding or ultrasonic welding, or an adhesion means using a hot melt adhesive. The elastic members disposed in the front waistline region and the back waistline region are sandwiched between the front waistline region and the back waistline region at the side joints. In the part where the front waistline region and the rear waistline region are joined by the bonding means, the elastic member is fixed in the side joint portion, but the front waistline region and the rear waistline region are not joined by the bonding means. As for the part, the elastic member is not being fixed in the side joining part. Therefore, when the absorbent article is stretched in the width direction, the end of the stretchable member may come off from the side joint.

  In particular, the thermal welding is performed by passing the gap between a pair of rolls so that the concave and convex portions formed on the outer peripheral surface of one roll are welded. According to such heat welding, the entire side joint portion is not joined, the joining region in which the front waistline region and the back waistline region are joined, and the front waistline region and the back waistline region are not joined. A region is formed.

  In the case of being partially joined in this way, the stretchable member and the joining region are not arranged correspondingly, and the position of the stretchable member may be shifted when the stretchable member is stretched in the width direction. There is a risk of falling out of the side joint.

  The present invention has been made in view of the above-described problems, and the displacement of the elastic member disposed in the side joint portion where the front waistline region and the rear waistline region are joined and the stretchable member are removed from the side joint portion. An object is to provide an absorbent article that can be prevented from coming off.

  The absorbent article according to the present disclosure includes a front-rear direction extending to the front side of the body and a rear side of the body, a width direction orthogonal to the front-rear direction, an inner direction toward the wearer, and an outer direction toward the opposite side to the inner direction. An absorbent body, a liquid-permeable top sheet disposed in the inner direction than the absorbent body, and a liquid-impermeable back sheet disposed in the outer direction than the absorbent body. Between the front waistline region disposed on the wearer's abdomen, the back waistline region disposed on the back of the wearer, the front waistline region and the back waistline region, and disposed on the wearer's inseam The front waistline region and the rear waistline region are provided with stretchable members that expand and contract in the width direction, at both ends in the width direction of the front waistline region and the rear waistline region. The front waistline region and the back waistline region A pant-type absorbent article in which a pair of joined side joints is formed, and the pair of side joints includes a plurality of joints joining the front waistline region and the rear waistline region in the front and rear directions. A first joining region formed at intervals in the direction, and a second joining region disposed outside the first joining region in the width direction and joining the front waistline region and the rear waistline region. The bonding strength of the first bonding region is higher than the bonding strength of the second bonding region, and the bonding portion of the first bonding region is along the elastic member and sandwiches the elastic member. The second bonding region is arranged so as to overlap the stretchable member.

  In the absorbent article according to the present disclosure, the joint portion in the first joint region of the side joint portion that joins the front waistline region and the rear waistline region is disposed with the stretchable member interposed therebetween. Can be sandwiched and held. Furthermore, the second bonding region on the outer side in the width direction than the first bonding region is disposed so as to overlap the stretchable member. Therefore, the stretchable member can be held between the joint portion of the first joint region and the second joint region, and when the stretchable member is stretched, the position of the stretchable member is shifted, or the stretchable member is removed from the side joint portion. Can be prevented.

It is a perspective view of the absorptive article concerning an embodiment. It is an expansion | deployment top view of the absorbent article shown in FIG. It is an enlarged plan view of the side junction part of the absorbent article shown in FIG. FIG. 4 is an enlarged plan view of a portion A in FIG. 3. It is BB sectional drawing of FIG. It is an enlarged plan view of the side junction part which concerns on a modification.

  With reference to FIGS. 1-5, the absorbent article 1 which concerns on embodiment is demonstrated. The absorbent article 1 according to the present embodiment is, for example, a pants-type diaper or an open-type diaper. The diaper may be an adult diaper or a child diaper.

  The absorbent article 1 according to the present embodiment is a pants-type diaper. The absorbent article 1 corresponds to the front waistline region S1 disposed on the wearer's belly side, the rear waistline region S2 disposed on the wearer's back side, and the inseam of the wearer, and the front waistline region S1 and the rear And a crotch region S3 located between the waist region S2.

  The absorbent article 1 includes an absorbent main body 1A and an exterior body 1B. The absorbent main body 1A includes a liquid-permeable top sheet 2, a liquid-impermeable back sheet, and an absorber 4 disposed between the top sheet 2 and the back sheet. The absorbent body 4 includes a front-rear direction L extending to the wearer's front side and rear side, a width direction W orthogonal to the front-rear direction, an inward direction toward the wearer, and a side opposite to the inward direction (away from the wearer). And an outward direction toward the side). The exterior body 1B is disposed outward from the absorbent main body 1A, and is disposed so as to cover the waist and waist of the wearer.

  FIG. 2 is a developed plan view showing a state where the absorbent article shown in FIG. 1 is developed. 2, the front waistline region S1 and the rear waistline region S2 are folded so as to overlap each other with the center in the front-rear direction L as a starting point, As a result, a pair of side joints 30 is formed on the absorbent article 1. In this way, the pants-type diaper shown in FIG. 1 is formed. The absorbent article 1 is formed with a waist opening 21 into which the wearer's waist is inserted and a pair of leg openings 22 into which the wearer's legs are respectively inserted.

  The topsheet 2 is positioned inward (wearer side) from the absorber 4. As the top sheet 2, a liquid-permeable sheet such as a nonwoven fabric or an apertured plastic film is used.

  The back sheet is disposed outward from the absorber 4 and inward from the exterior body 1B. A liquid-impermeable sheet or the like is used for the back sheet. Since the back sheet is impermeable to liquid, the excretion part discharged from the wearer and absorbed by the absorber can be prevented from leaking to the exterior body 1B.

The absorber 4 is provided between the top sheet 2 and the back sheet, and absorbs excrement from the wearer. For the absorber 4, a mixture of pulverized pulp and superabsorbent polymer particles or the like is used. The basis weight of the pulp is 250 to 400 g / m ² , and the basis weight of the superabsorbent polymer particles is 140 to 200 g / m ² .

  The exterior body 1 </ b> B includes an exterior top sheet, an exterior back sheet disposed outward from the exterior top sheet, and a stretchable member disposed in an extended state in the width direction W.

  The elastic member includes a waist elastic member disposed near the waist opening 21 and a waist elastic member disposed around the waist of the wearer. The waist elastic member includes a front waist elastic member 13A disposed in the front waist region S1, and a rear waist elastic member 13B disposed in the rear waist region S2. The waistline stretchable member includes a front waistline stretchable member 14A disposed in the front waistline region S1 and a back waistline stretchable member 14B disposed in the back waistline region S2.

  The front waistline stretchable member 13A and the rear waistline stretchable member 13B are displaced in the front-rear direction, and the front waistline stretchable member 14A and the rear waistline stretchable member 14B are displaced in the front-rear direction. Has been.

  The side joint portions 30 are formed at both ends in the width direction of the front waistline region S1 and the rear waistline region S2. FIG. 3 is an enlarged plan view of the side joint portion, and FIG. 4 is an enlarged plan view of a portion A in FIG. 5 is a cross-sectional view taken along the line BB in FIG. As for the side junction part 30, the exterior body 1B of the front waistline area | region S1 and the exterior body 1B of the back waistline area | region S2 are joined by heat welding. The side joint portion 30 includes a first joint region 30A in which a plurality of joint portions 32 joining the exterior body 1B in the front waistline region and the exterior body 1B in the rear waistline region are formed at intervals in the front-rear direction. There is provided a second joining region 30B that is disposed on the outer side in the width direction than the joining region and joins the exterior body 1B in the front waistline region and the exterior body 1B in the rear waistline region.

  The first joining region and the second joining region are both provided extending in the front-rear direction, and are regions that join the front waistline region S1 and the rear waistline region S2. A plurality of holes 31 are formed in the first bonding region 30A. The holes 31 are formed along the width direction, and a plurality of the holes 31 are arranged in parallel at intervals in the front-rear direction. The width of the first bonding region is the same as the width of the hole. The front waistline region and the back waistline region are joined at the joint portion 32 between the hole portion 31 and the hole portion 31 in the first joint region 30A, and are joined all over the second joint region 30B. . The joint strength of the joint portion 32 in the first joint region is configured to be higher than the joint strength in the second joint region.

  The bonding strength can be measured by, for example, the following method. The bonding strength is measured using a sample of the side bonding region so that the length dimension in the front-rear direction is about 25 mm and the length dimension in the width direction is about 30 mm. The measurement is performed by grasping the widthwise outer end of the front waistline region of the sample and the widthwise outer end of the rear waistline region and pulling them in a direction away from each other. The maximum strength is measured at a peeling speed of 300 mm / min, with the gripping interval in the front and rear waist area being about 10 mm.

  The hole 31 is formed by melting the exterior body 1B when the exterior body 1B in the front waistline region S1 and the exterior body 1B in the rear waistline region S2 are joined by thermal welding. The holes 31 are formed along the width direction W, and a plurality of the holes 31 are arranged in parallel in the front-rear direction L.

  The second joining region 30B is a region where the front waistline region S1 and the rear waistline region S2 are joined on the outer side in the width direction than the hole portion 31.

  As shown in FIG. 4, a plurality of joining portions 32 of the first joining region 30 </ b> A are formed along a stretchable member that is formed in a state where the joining portions 32 are spaced apart in the front-rear direction and extended in the width direction. . Further, as shown in FIG. 5, the joint portions 32 are disposed on the front side and the rear side of the front waist elastic member 13A. Therefore, the front waist elastic member is connected to the joint 32 in the front-rear direction. It is sandwiched.

  Moreover, the 2nd junction area | region is arrange | positioned overlapping the elastic member. Accordingly, the stretchable member can be held between the joint portion of the first joint region and the second joint region, and when the stretchable member is stretched, the position of the stretchable member is shifted, or the stretchable member is removed from the side joint portion. Can be prevented.

  The outer end portion of the stretchable member is disposed in the second joining region and is sandwiched between the front waistline region S1 and the rear waistline region S2. Therefore, the outer side edge part in the width direction of the elastic member can be held, and the elastic member can be effectively prevented from coming off.

  In addition, the second bonding area is disposed on the outer side in the width direction than the first bonding area. For example, when the rigidity of the second bonding area is high, the absorbent article falls when the wearer of the absorbent article lies down. When the side part is pressed to the wearer side, the wearer feels uncomfortable and the wearing feeling may be deteriorated. However, since the second bonding strength is relatively low, the flexibility is increased. Therefore, the softness | flexibility of a 2nd junction area | region can be improved, the discomfort at the time of a side junction part being pressed by the wearer side can be reduced, and a wearing feeling can be improved.

  In the present embodiment, the front waist elastic member and the rear waist elastic member are arranged so as to be displaced in the front-rear direction, and the elastic members are arranged one by one between the joint portions. Two stretchable members may be disposed between the joint portions.

  The side joint portion is formed by thermal welding, and is configured such that the melting temperature of the exterior topsheet and the exterior backsheet constituting the front waistline region and the rear waistline region is lower than the temperature of thermal welding forming the side joint portion. . Therefore, when the side joint portion is formed by heat welding, the exterior top sheet and the exterior back sheet are melted to form the hole.

  In addition, the temperature of heat welding can be adjusted with the temperature of the roll which performs heat welding. For example, when the material of the exterior top sheet and the exterior back sheet is polypropylene, the temperature of the roll can be thermally welded at 130 to 150 ° C., and when the material of the exterior top sheet and the exterior back sheet is polyethylene, Heat welding can be performed at a roll temperature of 120 to 140 ° C. Further, when the material of the exterior top sheet and the exterior back sheet is polypropylene, the hole portion can be formed while being thermally welded at a roll temperature of 170 to 185 ° C., and the material of the exterior top sheet and the exterior back sheet is In the case of polyethylene, the hole can be formed while heat welding at a roll temperature of 150 to 165 ° C.

  Further, when the first bonding region 30A is heat-welded, the bonding portions 32 and the hole portions 31 are alternately formed, so that, for example, irregularities are formed on the roll, and bonding is performed so as to partially have different heating strengths. . Specifically, the hole portion 31 is formed to have a relatively high heating strength, and the joint portion 32 is formed to have a relatively low heating strength. By heating the portion corresponding to the hole with a stronger strength than the portion corresponding to the joint, only the portion corresponding to the hole is melted to form the hole. Therefore, the hole part 31 and the junction part 32 can be formed.

  The fiber that has been disposed in the portion where the hole is formed before the thermal welding is melted by the thermal welding and disposed around the stretchable member. Therefore, it arrange | positions so that a fiber may wrap around an elastic member, and it can prevent the position shift and omission of an elastic member. Moreover, since the fiber wound around the stretchable member is cured by heat welding, the periphery of the stretchable member can be firmly solidified.

  The absorbent article comprised in this way can be manufactured with the following method, for example. First, the components constituting the absorbent article 1 such as the elastic member and the absorbent main body 1A are placed on the web constituting the exterior body 1B. Next, the web constituting the exterior body is cut along the leg opening 22. The web which comprises an exterior body is folded in the front-back direction based on the crease | fold along the width direction through the center in the front-back direction shown in FIG. After the web is folded, the side joints 30 are joined by heat welding. After joining the side joining part 30, it can cut | disconnect along the outer side edge part in the width direction of an absorbent article, and each absorbent article can be obtained.

  Next, an absorbent article according to a modification will be described with reference to FIG. In the description of the modified example, a configuration different from the above-described embodiment will be described, and the description of the same configuration will be omitted by using the same reference numerals. As for the absorbent article which concerns on a modification, the hole is not formed in the side junction part, but the junction part 32, the front waistline area | region, and the back waistline area | region are not joined to the 1st junction area | region 30A of a side junction part. A non-joining portion 33 is formed.

  The non-joining part 33 is provided between the joining parts 32 in the front-rear direction. Thus, by alternately arranging the joining portions 32 and the non-joining portions 33 in the front-rear direction and arranging the joining portions 32 so as to overlap the stretchable member, the stretchable member is sandwiched and held by the joint portion, It is possible to prevent the position of the stretchable member from shifting or the stretchable member from coming out of the side joint when the stretchable member is extended.

  Although the present invention has been described in detail using the above-described embodiments, it is obvious to those skilled in the art that the present invention is not limited to the embodiments described in this specification. The present invention can be implemented as modified and changed modes without departing from the spirit and scope of the present invention defined by the description of the scope of claims. Therefore, the description of the present specification is for illustrative purposes and does not have any limiting meaning to the present invention.

  For example, the side joint portion may be formed not only by thermal welding but also by ultrasonic welding.

  Further, the first bonding region and the second bonding region may be configured to be bonded on the entire surface of the hatched region in FIG. 3 or may be configured to be bonded in a plurality of linear regions. Alternatively, it may be configured to join at a plurality of dot-like regions. For example, by joining in a plurality of linear regions or dot-like regions, the joining area can be reduced and the rigidity of the first joining region and the second joining region can be reduced as compared with the configuration in which the entire surface of the region is joined. it can.

  Furthermore, in the present embodiment, as the stretchable member, the waistline stretchable member and the waistline elastic member are exemplified, but, for example, a leghole elastic member constituting a leg gather may be used.

DESCRIPTION OF SYMBOLS 1 ... Absorbent article 1A ... Absorbent main body 1B ... Exterior body 2 ... Top sheet 4 ... Absorber 13A ... Front waist elastic member 13B ... Rear waist elastic member 14A ... Front waist elastic member 14B ... Rear waist elastic Sexual member 21 ... waist opening 22 ... leg opening 30 ... side joint 30A ... first joint region 30B ... second joint region 31 ... hole 32 ... joint 33 ... non-joint portion S1 ... front waist region S2 ... rear Girth area
S3 ... Inseam area

Claims (6)

An absorbent body having a front-rear direction extending to the front side of the body and a rear side of the body, a width direction orthogonal to the front-rear direction, an inner direction toward the wearer, and an outer direction toward the opposite side of the inner direction; And a liquid-permeable top sheet disposed in the inner direction, and a liquid-impermeable back sheet disposed in the outer direction than the absorber,
Located between the front waistline region disposed on the wearer's ventral side, the back waistline region disposed on the wearer's back side, the front waistline region and the back waistline region, and disposed on the wearer's inseam An inseam area to be
The front waistline region and the back waistline region are provided with stretchable members that expand and contract in the width direction,
A pants-type absorbent article in which a pair of side joints joining the front waistline region and the rear waistline region are formed at both ends in the width direction of the front waistline region and the rear waistline region,
The pair of side joint portions includes a first joint region in which a plurality of joint portions joining the front waistline region and the rear waistline region are formed at intervals in the front-rear direction, and the first joint region Is also disposed on the outer side in the width direction, and includes a second joining region that joins the front waistline region and the rear waistline region,
The bonding strength of the first bonding region is higher than the bonding strength of the second bonding region,
The joining portion of the first joining region is disposed along the stretchable member and sandwiching the stretchable member,
The said 2nd joining area | region is an absorbent article arrange | positioned overlapping the said elastic member.   The absorbent article according to claim 1, wherein an outer end portion in the width direction of the stretchable member is disposed so as to overlap the second region.   The absorbent article according to claim 1 or 2, wherein a plurality of holes are formed at intervals between the joints in the front-rear direction of the first joint region. The sheet material that constitutes the front waistline region and the rear waistline region is constituted by a nonwoven fabric,
The absorbent article according to claim 3, wherein the fibers in the region in which the hole is formed are arranged so as to surround an outer periphery of the stretchable member. The stretchable member has a front stretchable member provided in the front waistline region and a back stretchable member provided in the back waistline region,
The absorbent article according to any one of claims 1 to 4, wherein the front stretchable member and the rear stretchable member are arranged so as to be shifted in the front-rear direction. The side joint portion is formed by heat welding,
The absorptivity according to any one of claims 1 to 5, wherein a melting temperature of a sheet material constituting the front waistline region and the rear waistline region is lower than a temperature of heat welding for forming the side joint portion. Goods.

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