JP2010119577A - Underpants-type absorbent article - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an underpants-type absorbent article with side sealed parts to be hardly hardened even if the basis weight of a layered part, in which each side edge of an abdominal part and side edge of a back-side part are layered on each other, becomes partly large. <P>SOLUTION: The underpants-type disposable diaper 1A has a pair of side sealed parts 8 and 8 formed by fusing layered parts 7 and 7 in which both side edges 6a and 6a of the abdominal part A and both side edges 6b and 6b of the back-side part B are layered on each other. The underpants-type disposable diaper 1A has a region with a different total basis weight of members composing the layered parts 7 and 7 in the side sealed parts 8 and 8. The layered part 7 of the underpants-type disposable diaper 1A is composed of a plurality of members. The area of the fused part of the pair of side sealed parts 8 and 8 is smaller in a region in which the total basis weight of the plurality of members is larger. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

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

Conventionally, a pair comprising a top sheet, a back sheet, and a liquid-retaining absorbent, and formed by fusing overlapping portions in which both side edges of the abdominal side and both side edges of the back side are overlapped with each other Various underpants-type absorbent articles having side seal portions have been proposed.
In order to prevent leakage of excrement from the waist opening, for example, Patent Document 1 discloses a pants-type disposable diaper having a waist three-dimensional gather.
In order to prevent leakage of excrement from the waist opening, for example, Patent Document 2 discloses a pants-type disposable provided with a waist ribbon containing an elastic member disposed over the entire circumference of the waist opening. Diapers are disclosed.

  However, in the disposable diapers described in Patent Document 1 and Patent Document 2, since both members constituting the waist solid gathers or the waist ribbon are arranged, both side edges of the ventral side and both sides of the back side The overlapping portion where the edge portions overlap each other is composed of a plurality of members. Therefore, in the superposed part, the basic weight is partially changed depending on the basis weight of each constituent material and the arrangement position of each constituent material. When the side seal part is formed by fusing the superposed part, the basis weight is large. The side seal part of the part tends to be hard, and sometimes causes pain when worn or damages the skin.

JP-A-4-354948 JP-A-10-290818

  Therefore, the object of the present invention is to prevent the side seal portion from becoming hard even if the basis weight of the overlapping portion where the both side edges of the ventral side and the both side edges of the back side overlap each other is partially increased. The object is to provide a pant-type absorbent article.

  The present invention has a pair of side seal portions formed by fusing overlapping portions in which both side edge portions on the ventral side portion and both side edge portions on the back side portion are overlapped with each other. A pants-type absorbent article in which different parts of the total basis weight of the members constituting the overlapping portion exist, wherein the overlapping portion is composed of a plurality of members, and the fusion area of the pair of side seal portions is: A region having a larger total basis weight of each of the plurality of members provides a smaller pant-type absorbent article.

  According to the pant-type absorbent article of the present invention, even if the basis weight of the overlapping portion where the both side edges of the abdominal side and the both side edges of the back side overlap each other is partially increased, the side seal portion Is hard to harden and is unlikely to cause pain or damage to the skin when worn.

  Hereinafter, a preferred first embodiment of a pants-type disposable diaper, which is a pants-type absorbent article of the present invention, will be described with reference to FIGS.

The pants-type disposable diaper 1A of the first embodiment is formed by fusing overlapping portions 7, 7 in which both side edges 6a, 6a of the ventral side A and both side edges 6b, 6b of the back side B are overlapped with each other. A pair of side seal portions 8, 8 formed in such a manner that the overlapping portion 7 is composed of a plurality of members, and the total basis weight of the members constituting the overlapping portions 7, 7 in the side seal portions 8, 8. There are different sites. The area of fusion of the pair of side seal portions 8, 8 of the pant-type disposable diaper 1A of the first embodiment is formed smaller as the total basis weight of each of the plurality of members is larger.
As shown in FIGS. 1 and 2, the pant-type disposable diaper 1 </ b> A of the first embodiment is formed symmetrically with respect to the center line CL. Therefore, in the following description, the left and right symmetrical parts will be mainly described.

  The pants-type disposable diaper 1A of the first embodiment will be described in detail. The pants-type disposable diaper 1A of the first embodiment (hereinafter also referred to as “diaper 1A”) is liquid-permeable as shown in FIG. A substantially vertically long absorbent main body 5 having a top sheet 2, a liquid-impermeable (including water-repellent) back sheet 3, and an absorbent body 4 interposed between both sheets 2 and 3, and an absorbent main body 5 is provided on the back sheet side of the outer packaging material 6 and fixed by adhesion.

  As shown in FIG. 2, the outer packaging material 6 has an abdominal side A, a crotch C, and a dorsal side in the longitudinal direction (hereinafter referred to as “Y direction”. Y direction: a direction parallel to the center line CL). Part B is included. In the outer packaging material 6, the overlapping portions 7, 7 in which the side edges 6 a, 6 a of the ventral side A and the side edges 6 b, 6 b of the back side B are overlapped with each other are fused, By forming 8, a pants-type disposable diaper 1A having a waist opening WO and a pair of leg openings LO, LO shown in FIG. 1 is formed. The abdomen side A of the outer packaging material 6 is a part arranged on the abdomen side of the wearer when the diaper 1A is worn, and the back side part B is a part arranged on the dorsal side of the wearer. C is a site | part distribute | arranged to a wearer's crotch part.

  The outer packaging material 6 extends over the entire outer region of the absorbent main body 5, and includes an outer layer sheet 61 that forms the outer surface of the diaper, an inner layer sheet 62 disposed on the inner surface side of the outer layer sheet 61, and an outer layer sheet 61. Or it has the folding | returning part 61a, 61b or 62a, 62b which turned up the longitudinal direction (Y direction) outer part from the absorptive main body 5 of the inner layer sheet 62 to the inner layer sheet 62 side. In the diaper 1A, as shown in FIG. 2, the outer packaging material 6 has a shape in which both side edges are inwardly bounded in the center in the longitudinal direction (Y direction). In addition, as shown in FIGS. 1 to 3, the outer packaging material 6 folds the outer layer sheet 61 that forms the outer surface of the diaper, the inner layer sheet 62 disposed on the inner surface side of the outer layer sheet 61, the outer layer sheet 61 and the outer layer sheet 61. A plurality of waist elastic members 63 disposed and fixed between the folded portion 61a and a plurality of leg elastic members 64 disposed and fixed between the outer layer sheet 61 and the inner layer sheet. The plurality of waistline elastic members 63 are provided along the peripheral edge portions serving as the waist openings WO of the abdominal side portion A and the back side portion B, and each waistline elastic member 63 is in an extended state in the width direction ( Hereinafter, it is referred to as “X direction.” X direction: It is arranged and fixed in a direction perpendicular to the center line CL extending in the longitudinal direction of the disposable diaper 1A. As shown in FIG. 2, the plurality of leg elastic members 64 are arranged along the peripheral edge portion that becomes the leg opening LO, and each leg elastic member 64 is disposed and fixed in an extended state.

  The outer layer sheet 61 of the outer packaging material 6 of the diaper 1A is, as shown in FIGS. 2, 3 (a), and 3 (b), the longitudinal direction (Y Direction) and has a length extending outward in the longitudinal direction (Y direction) further than both ends 62c, 62c, and folded portions 61a, 61b are formed by folding the extended portions toward the inner layer sheet 62 side. is doing. As shown in FIG. 2 and FIG. 3A, the outer layer sheet 61 sandwiches and fixes a plurality of waist elastic members 63 together with the folded portion 61 a at the ventral side A. Similarly, as shown in FIGS. 2 and 3B, the outer layer sheet 61 sandwiches and fixes a plurality of waist elastic members 63 together with the folded portion 61 b at the back side portion B. As shown in FIGS. 2 and 3A, the folded portion 61 a has an end edge 61 a 1 in the longitudinal direction (Y direction) at the end on the ventral side A in the longitudinal direction (Y direction) of the absorbent main body 5. It extends to a position closer to the crotch C than the edge. Similarly, as shown in FIG. 2 and FIG. 3B, the folded portion 61 b has an end edge 61 b 1 in the longitudinal direction (Y direction) and a back side portion B in the longitudinal direction (Y direction) of the absorbent main body 5. It extends to a position closer to the crotch part C than the side edge. Thus, the both ends of the longitudinal direction (Y direction) of the absorptive main body 5 are pinched by the outer packaging material 6 and the folding | returning parts 61a and 61b.

  The inner layer sheet 62 of the outer wrapping material 6 of the diaper 1A is in the longitudinal direction (Y direction) as shown in FIG. 2, FIG. 3 (a) and FIG. Both ends 62c, 62c extend between the vicinity of both end edges in the longitudinal direction (Y direction) of the absorbent main body 5. That is, the inner layer sheet 62 is different from the outer layer sheet 61 in that the folded portion is not formed and the length of the inner layer sheet 62 in the longitudinal direction (Y direction) as shown in FIGS. 3 (a) and 3 (b). The length is shorter than the length of the outer layer sheet 61 in the longitudinal direction (Y direction).

In the diaper 1 </ b> A, the inner layer sheet 62 of the outer packaging material 6 has a basis weight larger than the basis weight of the outer layer sheet 61. From the viewpoint of texture and cost, in the diaper 1A, the basis weight of the outer layer sheet 61 is 8 g / m ^{2 to} 30 g / m ² , and the basis weight of the inner layer sheet 62 is 8 g / m ^{2 to} 30 g / m ² . It is preferable. The basis weight is measured by the following method.

<Measurement method of basis weight>
The inner layer sheet 62 and the outer layer sheet 61 are each cut into a size of 30 mm × 30 mm or more, and a measuring piece having a total area of 900 mm ² is taken from one diaper. Determined by using and measuring to basis weight. The value of the basis weight is an average value obtained by collecting measurement pieces from n = 5 diapers. Each measurement piece of the inner layer sheet 62 and the outer layer sheet 61 is collected from a portion other than the side seal portion 8. When a measurement piece having a size of 30 mm × 30 mm cannot be taken, sampling is performed so that the area is as large as possible, and the basis weight is converted from the area. When the inner layer sheet and the outer layer sheet are joined with an adhesive such as hot melt, the adhesive is washed away with an organic solvent such as chloroform, and then sufficiently dried and the weight is measured. The same applies to the case where the basis weight of another member other than the member forming the outer packaging material 6 is measured.

  In the diaper 1 </ b> A, as shown in FIGS. 1 and 2, the overlapping portion 7 is formed of an outer packaging material 6 composed of a plurality of members. Specifically, as shown in FIG. 3A, the side edge portion 6a of the ventral side portion A includes an outer layer sheet 61, an inner layer sheet 62, and a folded portion 61a. The edge part 6b has the outer layer sheet 61, the inner layer sheet 62, and the folding | returning part 61b, as shown in FIG.3 (b). A portion where the side edge portion 6a of the ventral side portion A and the side edge portion 6b of the back side portion B are overlapped with each other becomes the overlapping portion 7 as shown in FIG.

  In diaper 1A, as shown to Fig.3 (a), the side edge part 6a of the ventral | abdominal side part A is a 6a1 area | region which consists of two members, the outer layer sheet 61 and the folding | returning part 61a, in a longitudinal direction (Y direction). The outer layer sheet 61, the inner layer sheet 62, and the folded portion 61 a have a 6a2 region, and the outer layer sheet 61 and the inner layer sheet 62 have a 6a3 region. Here, since the basis weight of the inner layer sheet 62 is larger than the basis weight of the outer layer sheet 61, the total basis weight of the 6a2 region composed of three members is the total basis weight of the basis weights of the plurality of members in each region. The total basis weight of the 6a3 region composed of two members and the total basis weight of the 6a3 region composed of two members, and the total basis weight of the 6a3 region composed of two members including the inner layer sheet 62 It is larger than the total basis weight of the 6a1 region composed of two members not included.

  Similarly, in the diaper 1A, as shown in FIG. 3 (b), the side edge 6b of the ventral side B is composed of two members, that is, an outer layer sheet 61 and a folded portion 61b in the longitudinal direction (Y direction). 6b1 area | region, 6b2 area | region which consists of three members, the outer layer sheet 61, the inner layer sheet 62, and the folding | returning part 61b, and 6b3 area | region which consists of two members, the outer layer sheet 61 and the inner layer sheet 62, are included. Here, since the basis weight of the inner layer sheet 62 is larger than the basis weight of the outer layer sheet 61, the total basis weight of each of the plurality of members in each region is the total basis weight of the 6b2 region including the three members. The total basis weight of the 6b1 region composed of two members and the total basis weight of the 6b3 region composed of two members, and the total basis weight of the 6b3 region composed of two members including the inner layer sheet 62 It is larger than the total basis weight of the 6b1 region composed of two members not included. The overlapping portion 7 in which the side edge portion 6a and the side edge portion 6b are overlapped includes the region having the largest total basis weight in which the 6a2 region and the 6b2 region are overlapped, and then the 6a3 region and 6b3 having the largest total basis weight. It has the area | region where the total basis weight which overlap | superposed the area | region which overlap | superposed the area | region and the 6a1 area | region and 6b1 area | region was the smallest. The side seal portion 8 is formed by fusing the overlapping portion 7.

  The side seal portion 8 is formed such that the fusion area thereof is smaller as the total basis weight of the plurality of members constituting the overlapping portion 7 is larger. As shown in FIG. 3C, the side seal portion 8 of the diaper 1A has a fusion area of a seal region 8a2 formed by fusing a region where the 6a2 region and the 6b2 region are overlapped with each other. The sealing area 8a3 formed by fusing the area overlapped with the 6b3 area and the sealing area 8a1 formed by fusing the area overlapped with the 6a1 area and the 6b1 area are smaller than the fusion area. The seal area 8a3 formed by fusing a region where the 6a3 region and the 6b3 region are overlapped with each other has a fusion area of the seal region 8a1 formed by fusing the region where the 6a1 region and the 6b1 region are overlapped with each other. It is formed so as to be smaller than the fusion area. Specifically, as shown in FIG. 3 (c), the seal region 8a1, the seal region 8a2, and the seal region 8a3 are each composed of a fusion portion 81 extending in the width direction (X direction) and the length of the diaper 1A. And a fusion part 82 extending incline toward the center of the end on the ventral side A in the direction (Y direction). The width of the fusion part 81 in the seal region 8a2 is narrower than the width of the fusion part 81 in the seal region 8a1 and the seal region 8a3, and the width of the fusion part 81 in the seal region 8a3 is the fusion part 81 in the seal region 8a1. It is formed narrower than the width of. The widths of the fused portions 82 in the seal region 8a1, the seal region 8a2, and the seal region 8a3 are all the same, and the interval between the fused portions 82 is also the same.

  The width of the fusion part 81 in the seal region 8a2 is preferably 0.2 mm to 2 mm, and the width of the fusion part 81 in the seal region 8a3 is preferably 0.4 mm to 2.5 mm. The width of the fused part 81 in 8a1 is preferably 0.6 mm to 3 mm. The interval between the fusion portions 81 in the seal region 8a2 is preferably 3 mm to 8 mm, the interval between the fusion portions 81 in the seal region 8a3 is preferably 2 mm to 7 mm, and the fusion in the seal region 8a1. The interval between the portions 81 is preferably 1 mm to 6 mm. As shown in FIG. 3C, the angle α at which the fused portion 81 and the fused portion 82 intersect is preferably 30 ° to 70 °. The width of the fused portion 82 in the seal region 8a1, the seal region 8a2, and the seal region 8a3 is preferably 0.5 mm to 3 mm, and the interval between the fused portions 82 is preferably 1 mm to 5 mm.

  As a method for fusing the side seal portion 8, heat embossing, ultrasonic embossing, high frequency embossing, or the like is used. In the diaper 1A, as shown in FIG. 4, a pair of ultrasonic embossing rolls 80a and 80b are used. Yes. Specifically, a belt-like shape is formed between an embossing roll 80a having a convex portion 80 formed so as to correspond to the shape of the side seal portion 8 shown in FIG. 3C and a flat roll 80b having a flat surface. The side seal portion 8 is formed by embossing with the convex portion 80 and the flat roll 80b at the position of the overlapping portion 7 where the side edge portion 6a and the side edge portion 6b are overlapped through the diaper 1A continuous body. . The convex portion 80 is orthogonal to the flow direction so that the direction orthogonal to the flow direction of the continuous body of the strip-shaped diaper 1A corresponds to the longitudinal direction (Y direction) of the side seal portion 8 shown in FIG. In this direction, the projections correspond to the shapes of the seal region 8a1, the seal region 8a2, and the seal region 8a3. Therefore, the side seal part 8 is formed by one embossing.

  Here, the fusion area of the seal region 8a1, the fusion area of the seal region 8a2, and the fusion area of the seal region 8a3 are the areas of the portions embossed by the convex portions 80, specifically, the side seal portion 8. Is a part formed into a film by an embossing process, and the side seal part 8 is viewed in a plan view to indicate the area of the bottom part of the embossing process part. When the side seal portion 8 is contracted in the width direction (X direction) or the like by the waistline elastic member 63 or the like, the area of the bottom portion is measured in an expanded state.

  The fusion strength of the side seal portion 8 is preferably 5 N / 30 mm to 40 N / 30 mm, and more preferably 5 N / 30 mm to 30 N / 30 mm. The fusion strength of the side seal portion 8 means that the fusion strength in any of the seal region 8a1, the seal region 8a2, and the seal region 8a3 satisfies the above numerical range. If the fusion strength of the side seal portion 8 is in a numerical range of 5 N / 30 mm to 40 N / 30 mm, peeling of the side seal portion 8 in use can be prevented. Moreover, since the side seal part 8 can be easily broken after use, it is easy to replace the diaper.

  The minimum strength (F min / F max) of the side seal portion relative to the maximum strength of the side seal portion 8 is preferably 2/3 <F min / F max ≦ 1. More preferably, / 6 <F min / F max ≦ 1. If the minimum strength (F min / F max) of the side seal portion relative to the maximum strength of the side seal portion 8 is 2/3 <F min / F max ≦ 1, Since the variation in the fusion strength is small, the side seal portion 8 can be easily broken with a uniform force after use, so that the diaper can be replaced more easily. The fusion strength is measured by the following method.

<Measurement method of fusion strength>
The side seal portion 8 is cut from the diaper 1A along the longitudinal direction (Y direction) of the diaper 1A. Next, the cut side seal portion 8 is cut in the width direction (X direction) at the seal region 8a1, the seal region 8a2, and the seal region 8a3, and the length of the seal portion in the longitudinal direction (Y direction) is 30 mm. A sample in the region 8a1, a sample in the seal region 8a2, and a sample in the seal region 8a are obtained.
The seal strength of each region is measured with a tensile tester [trade name: Autograph AGS50A, manufactured by Shimadzu Corporation]. At that time, measurement is performed at a tensile speed of 300 mm / min to obtain the maximum strength. The measurement is performed n = 5 times, and the average value is used as the fusion strength of the region. In addition, when the length of the seal part of each area | region cannot take 30 mm, it measures by the maximum width | variety close | similar to 30 mm, and calculates | requires fusion strength by converting into the width | variety of 30 mm.

  As shown in FIG. 2, the absorbent main body 5 includes a liquid-permeable top sheet 2, a liquid-impermeable (including water-repellent) back sheet 3, and a liquid-retaining property interposed between both sheets 2 and 3. It has the absorber 4 and is substantially vertically long. As shown in FIG. 2, the absorbent main body 5 is disposed from the back side portion B to the ventral side portion A of the outer packaging material 6, and both ends of the longitudinal direction (Y direction) of the absorbent main body 5 are The outer packaging material 6 is in a position retracted inward in the longitudinal direction (Y direction) from both ends in the longitudinal direction (Y direction). The absorptive main body 5 is joined to the inner layer sheet 62 of the outer packaging material 6 by a joining method using an adhesive, heat sealing, ultrasonic sealing or the like.

  As shown in FIG. 2, side cuffs 51 and 51 made of a liquid-resistant or water-repellent and breathable material are provided on both sides in the longitudinal direction (Y direction) of the absorbent main body 5. . In the vicinity of the free end portion of each side cuff 51, an elastic member 52 for forming the side cuff is disposed and fixed in a state of extending in the longitudinal direction (Y direction). The side cuffs 51 stand up at the free end when the diaper is worn, and can prevent excrement from flowing out in the width direction (X direction) of the absorbent main body 5. In the side cuff 51 forming sheet, a portion having a predetermined width on the outer side in the width direction (X direction) of the absorbent main body 5 is wound around the non-skin contact surface side and fixed.

The material for forming the pants-type disposable diaper 1A of the first embodiment will be described.
The fusion component of the member constituting the polymerization portion 7 is preferably made of a general-purpose resin such as polypropylene, polyethylene, or polyester from the viewpoint of cost, but the fusion components of the members constituting the polymerization portion 7 are of the same series. Preferably it is a component. In the diaper 1A, the members constituting the overlapping portion 7 are the outer layer sheet 61 (including the folded portion 61a) and the inner layer sheet 62 (including the folded portion 62a). Therefore, it is preferable that the outer layer sheet 61 and the inner layer sheet 62 are components of the same series. The fusion component constituting the outer layer sheet 61 and the inner layer sheet 62 is a component of the same series of polypropylene, for example, a non-woven sheet formed from only polypropylene PP homopolypropylene, and a small amount of ethylene in the propylene chain. 50% or more of non-woven sheet, homo PP resin or random PP resin formed only from random PP fibers taken at random, but thermoplastic resin other than homo PP resin or random PP resin (for example, polyethylene resin, polyester resin, etc.) 50% or more of a non-woven sheet, a homo PP fiber or a random PP fiber formed from a core-sheath type composite fiber or a side-by-side type composite fiber mixed with a non-homo PP fiber or a random PP fiber (for example, rayon fiber, Cotton fiber, polyethylene fiber, polyester fiber, etc.) Nonwoven sheets made from cotton mixing the fibers.

  It can be understood that the fusion component constituting the outer layer sheet 61 and the inner layer sheet 62 is a component of the same series as that of polyethylene or polyester, similarly to the component of the same series of polypropylene. In particular, a component of the same series as polyethylene means that a core-sheath type composite fiber or side-by-side type composite fiber whose core part is made of polyester resin and whose sheath part is made of polyethylene resin, and whose core part is made of polypropylene resin and whose sheath part is made of polyethylene resin. A nonwoven fabric sheet or the like formed from a fiber in which a core-sheath type composite fiber or a side-by-side type composite fiber is mixed is preferable. In particular, a non-woven sheet formed from a fiber in which a core-sheath type composite fiber or a side-by-side type composite fiber in which a core part is made of a polyester resin and a sheath part is made of a low-melting-point polyester resin is a component of the same series as polyester. Etc. are preferred. If the fusion component of the member constituting the polymerized portion 7 is a component of the same series as polypropylene, polyethylene or polyester, the fusion component has good compatibility and good fusion strength. can do. Therefore, since it is not necessary to perform the embossing process at a high temperature, the part other than the embossed part is not cured, the entire side seal part is softened, and the touch is improved.

  As the surface sheet 2, the back sheet 3, and the side cuff 51 forming sheet, any sheet can be used without particular limitation as long as it is normally used for absorbent articles such as disposable diapers. For example, a liquid-permeable nonwoven fabric, an apertured film, or a laminate of these can be used as the top sheet 2, and a resin film or a laminate of a resin film and a nonwoven fabric can be used as the back sheet 3. Can do. As the sheet for forming the side cuffs 51, a stretchable film, a nonwoven fabric, a woven fabric, or a laminated sheet thereof can be used.

  The absorbent body 4 can be used without particular limitation as long as it is normally used for absorbent articles such as disposable diapers. For example, as the absorbent body 4, a fiber aggregate of a fiber material such as pulp or a material in which a superabsorbent polymer is supported and wrapped with a covering material such as tissue paper or a water-permeable nonwoven fabric is used. Can be used.

  As the elastic member 52 for forming the side cuff, the waist elastic member 63, and the leg elastic member 64, any member can be used without particular limitation as long as it is normally used for absorbent articles such as disposable diapers. For example, a stretchable material made of natural rubber, polyurethane, polystyrene-polyisoprene copolymer, polystyrene-polybutadiene copolymer, polyethylene-α olefin copolymer such as ethyl acrylate-ethylene, or the like can be used.

Next, the effect at the time of using the underpants type disposable diaper 1A of 1st Embodiment of this invention mentioned above is demonstrated.
The diaper 1A of 1st Embodiment is the sum total of the basic weight of each of the several member which the fusion | melting area of a pair of side seal part 8 and 8 comprises the superposition | polymerization part 7 and 7, as shown in FIGS. The smaller the basis weight, the smaller the area. In general, when the total basis weight of the number of members forming the polymerized portion increases, the amount of the fusion resin increases accordingly. Injuries such as damage will occur. In the present invention, as described above, the sum of a plurality of members constituting the overlapping portions 7 and 7 in which the side edges 6a and 6a of the ventral side A and the side edges 6b and 6b of the back side B are overlapped with each other. Even if the basis weight is partially increased and the amount of resin constituting the fusion component is increased, the fusion area is changed according to the total basis weight, so the total fusion area of the entire side seal portion 8 Can be suppressed. Therefore, the side seal portion 8 is hard to be hard, and it is difficult to cause pain at the time of wearing or damage to the skin. In addition, since the fusion strength in each region is almost the same, when the side portion is peeled off after use, it can be peeled with the same force, and the usability is also improved.

Next, a pants-type disposable diaper according to a second embodiment of the pants-type absorbent article of the present invention will be described with reference to FIGS.
Regarding the pants-type disposable diaper 1B of the second embodiment, the components that are different from the pants-type disposable diaper 1A of the first embodiment will be mainly described, and the same components will be denoted by the same reference numerals and description thereof will be omitted. The description about the pants-type disposable diaper 1 </ b> A of the first embodiment is appropriately applied to components that are not particularly described.

  The overlapping portion 7 of the pants-type disposable diaper 1B (hereinafter also referred to as “diaper 1B”) of the second embodiment is configured to include another member such as a sweat-absorbing sheet other than the member that forms the outer packaging material 6. Specifically, as shown in FIGS. 5 and 6, the diaper 1 </ b> B is greatly different from the diaper 1 </ b> A in that a sweat-absorbing sheet 9 extending in the width direction (X direction) on the back side portion B is disposed. . Hereinafter, the diaper 1B will be described in detail.

  As shown in FIG. 5, the outer wrapping material 6 of the diaper 1 </ b> B extends over the entire outer region of the absorbent main body 5, and is arranged on the outer layer sheet 61 that forms the outer surface of the diaper and on the inner surface side of the outer layer sheet 61. The inner layer sheet 62, and folded portions 61a and 61b in which the outer portion of the outer layer sheet 61 in the longitudinal direction (Y direction) is folded back to the inner layer sheet 62 side. As shown in FIGS. 5 and 6, the outer layer sheet 61 of the outer packaging material 6 of the diaper 1 </ b> B has the waist elastic member 63 sandwiched and fixed between the outer layer sheet 61 and the inner layer sheet 62 as shown in FIGS. 5 and 6. It has a length that extends further outward in the longitudinal direction (Y direction) than the portion, and the extended portion is folded back to the inner layer sheet 62 side to form folded portions 61a and 61b. As shown in FIGS. 5 and 6A, the folded portion 61 a has an end edge 61 a 1 in the longitudinal direction (Y direction) at the end on the ventral side A side in the longitudinal direction (Y direction) of the absorbent main body 5. It extends to a position closer to the crotch C than the edge. Similarly, as shown in FIG. 5 and FIG. 6B, the folded portion 61 b has an end edge 61 b 1 in the longitudinal direction (Y direction) of the back side portion B in the longitudinal direction (Y direction) of the absorbent main body 5. It extends to a position closer to the crotch part C than the side edge. Thus, the both ends of the longitudinal direction (Y direction) of the absorptive main body 5 are pinched by the outer packaging material 6 and the folding | returning parts 61a and 61b.

  The inner layer sheet 62 of the outer wrapping material 6 of the diaper 1A is in the longitudinal direction (Y direction) as shown in FIG. 5, FIG. 6 (a), FIG. Both ends 62c, 62c extend between the vicinity of both end edges in the longitudinal direction (Y direction) of the absorbent main body 5. That is, the inner layer sheet 62 is different from the outer layer sheet 61 in that the folded portion is not formed and the length of the inner layer sheet 62 in the longitudinal direction (Y direction) as shown in FIGS. 6 (a) and 6 (b). The length is shorter than the length of the outer layer sheet 61 in the longitudinal direction (Y direction).

  The sweat-absorbent sheet 9 of the diaper 1B extends in the width direction (X direction) of the ventral side A and the back side B as shown in FIGS. 5, 6A, and 6B. The sweat-absorbing sheet 9 is disposed on the folded portion 61b of the outer layer sheet 61, and extends across the side edges 6a, 6a of the ventral side A and between the side edges 6b, 6b of the back side B. ing. The perspiration-absorbing sheet 9 of the ventral side A is related to the length in the longitudinal direction (Y direction), near the edge of the ventral side A in the longitudinal direction (Y direction) of the diaper 1B and the longitudinal direction (Y direction) of the inner layer sheet 62. It extends over between the vicinity of the end edge in the ventral side A. Similarly, the sweat-absorbent sheet 9 on the back side B is related to the length in the longitudinal direction (Y direction) and the vicinity of the edge in the back side B in the longitudinal direction (Y direction) of the diaper 1B and the longitudinal direction of the inner layer sheet 62 ( It extends over the vicinity of the edge in the back side portion B in the Y direction).

In the diaper 1B, the basis weight of the inner layer sheet 62 of the outer packaging material 6 and the basis weight of the outer layer sheet 61 are substantially the same, and the basis weight of the sweat absorbing sheet 9 is the basis weight of the inner layer sheet 62 and the basis weight of the outer layer sheet 61. The one larger than the amount is used. From the standpoint of sweat, the basis weight of the sweat-absorbent sheet 9 is preferably ^{10g / m 2 ~40g / m 2} . Texture, from the viewpoint of cost, in the diaper 1B, the basis weight of the basis weight and the inner layer sheet 62 of the exterior sheet 61 is preferably ^{8g / m 2 ~30g / m 2} . The basis weight of the sweat-absorbing sheet 9 is measured by the method for measuring the basis weight of the outer layer sheet 61 and the basis weight of the inner layer sheet 62 described above.

  The side edge 6a of the ventral side A of the diaper 1B has an outer layer sheet 61, an inner layer sheet 62, a folded portion 61a, and a sweat absorbing sheet 9, as shown in FIG. As shown in FIG. 6B, the side edge portion 6 b of B has an outer layer sheet 61, an inner layer sheet 62, a folded portion 61 b, and a sweat absorbing sheet 9.

  In the diaper 1B, as shown in FIG. 6 (a), the side edge 6a of the ventral side A is composed of three members, an outer layer sheet 61, a folded portion 61a, and a sweat absorbing sheet 9, in the longitudinal direction (Y direction). 6a1 region, a 6a2 region composed of three members of the outer layer sheet 61, the inner layer sheet 62 and the folded portion 61a, and a 6a3 region composed of two members of the outer layer sheet 61 and the inner layer sheet 62. Here, the total basis weight of each of the plurality of members in each region is such that the basis weight of the sweat absorbing sheet 9 is greater than the basis weight of the outer layer sheet 61 and the basis weight of the inner layer sheet 62, and the basis weight of the outer layer sheet 61. Since the basis weight of the inner layer sheet 62 is substantially the same, the total basis weight of the 6a1 region is larger than the total basis weight of the 6a2 region and the total basis weight of the 6a3 region, and the total basis weight of the 6a2 region is that of the 6a3 region. Greater than total basis weight.

  Similarly for the side edge 6b of the ventral side B, in the diaper 1B, as shown in FIG. 6B, in the longitudinal direction (Y direction), the outer layer sheet 61, the folded portion 61b, and the sweat absorbing sheet 9 3 6b1 region composed of two members, 6b2 region composed of three members, outer layer sheet 61, inner layer sheet 62 and folded portion 61b, and 6b3 region composed of two members, outer layer sheet 61 and inner layer sheet 62 ing. Here, the total basis weight of each of the plurality of members in each region is such that the basis weight of the sweat absorbing sheet 9 is greater than the basis weight of the outer layer sheet 61 and the basis weight of the inner layer sheet 62, and the basis weight of the outer layer sheet 61. Since the basis weight of the inner layer sheet 62 is substantially the same, the total basis weight of the 6b1 region is larger than the total basis weight of the 6b2 region and the total basis weight of the 6b3 region, and the total basis weight of the 6b2 region is 6b3 region. Greater than total basis weight. The overlapping portion 7 in which the side edge portion 6a and the side edge portion 6b are overlapped includes the region having the largest total basis weight obtained by overlapping the 6a1 region and the 6b1 region, and then the 6a2 region and 6b2 having the largest total basis weight. It has the area | region where the total basis weight which overlap | superposed the area | region which overlap | superposed the area | region and the 6a3 area | region and 6b3 area | region was the smallest. The side seal portion 8 is formed by fusing the overlapping portion 7.

  The side seal portion 8 is formed such that the fusion area thereof is smaller as the total basis weight of the plurality of members constituting the overlapping portion 7 is larger. As shown in FIG. 6C, the side seal portion 8 of the diaper 1B has a fusion area of a seal region 8a1 formed by fusing a region where the 6a1 region and the 6b1 region are overlapped with each other. Smaller than the fusion area of the seal region 8a3 formed by fusing the seal region 8a2 formed by fusing the region overlaid with the 6b2 region and the region overlaid with the 6a3 region and the 6b3 region, A seal area 8a3 formed by fusing a region where the 6a3 region and the 6b3 region are overlapped is a fusion area of the seal region 8a2 formed by fusing the region where the 6a2 region and the 6b2 region are overlapped. It is formed so as to be smaller than the fusion area. Specifically, as shown in FIG. 6C, the seal region 8 a 1, the seal region 8 a 2, and the seal region 8 a 3 have a plurality of circular fusion portions 83. The diameter of the fusion part 83 in the seal region 8a1 is shorter than the diameter of the fusion part 83 in the seal region 8a2 and the seal region 8a3, and the diameter of the fusion part 83 in the seal region 8a2 is the fusion part 83 in the seal region 8a3. It is formed shorter than the diameter.

  The diameter of the fusion part 83 in the seal region 8a1 is preferably 1 mm to 3 mm, the diameter of the fusion part 83 in the seal region 8a2 is preferably 2 mm to 4 mm, and the fusion part 83 in the seal region 8a3. The diameter of is preferably 3 mm to 5 mm.

The formation material of the pants-type disposable diaper 1B of 2nd Embodiment is demonstrated.
About the underpants type disposable diaper 1B of 2nd Embodiment, a different point from the underpants type disposable diaper 1A of 1st Embodiment is demonstrated. The point which is not demonstrated especially is the same as that of 1 A of underpants type disposable diapers of 1st Embodiment.

  The sweat-absorbing sheet 9 can be used without particular limitation as long as it is normally used for absorbent articles such as disposable diapers. For example, as the sweat-absorbing sheet 9, a spunlace nonwoven fabric, an air-through nonwoven fabric, paper or the like containing 50% by weight or more, particularly 60% by weight or more of hydrophilic fibers such as rayon, cotton, or pulp can be used.

The effect at the time of using the underpants type disposable diaper 1B of 2nd Embodiment of this invention mentioned above is demonstrated.
The underpants type disposable diaper 1B of the second embodiment can obtain the same effects as the underpants type disposable diaper 1A of the first embodiment. Hereinafter, effects different from the pant-type disposable diaper 1A of the first embodiment will be described.

  The disposable diaper 1B of the second embodiment, as shown in FIG. 5 and FIG. 6, is particularly provided with a sweat-absorbing sheet 9 on each of the abdominal side A and the back side B. The total basis weight of each of the plurality of members constituting the overlapping portions 7 and 7 in which the 6a and 6a and both side edge portions 6b and 6b of the back side portion B are overlapped with each other is partially increased. However, since the fusion area is changed according to the total basis weight, the total fusion area of the entire side seal portion 8 can be suppressed. Therefore, the side seal portion 8 is hard to be hard, and it is difficult to cause pain at the time of wearing or damage to the skin.

  The pants-type absorbent article of the present invention is not limited to the pants-type disposable diapers 1A and 1B of the first embodiment and the second embodiment described above, and can be changed as appropriate. Moreover, each component in the underpants type disposable diaper 1A, 1B of the first embodiment and the second embodiment described above can be appropriately combined and implemented without departing from the spirit of the present invention.

  For example, in the pants-type disposable diapers 1A and 1B of the first and second embodiments described above, the outer packaging material 6 composed of the outer layer sheet 61 and the inner layer sheet 62 is absorbed as shown in FIGS. 7, the outer layer sheet 61 and the inner layer sheet 62 are arranged only on the ventral portion A and the back portion B, as shown in FIG. The material 6 may be partially formed on the ventral side A and the back side B. Note that the pant-type disposable diaper shown in FIG. 7 is a modified form of the pant-type disposable diaper 1A of the first embodiment.

  In the pants-type disposable diapers 1A and 1B of the first and second embodiments described above, as shown in FIGS. 2 and 5, the outer layer sheet 61 and the inner layer sheet 62 are all outside the absorbent main body 5. However, as shown in FIG. 8, one of the outer layer sheet 61 and the inner layer sheet 62 is extended over the entire outer region of the absorbent main body 5 to form the outer packaging material 6. Also good. In addition, the underpants type disposable diaper shown in FIG. 8 is the form which deform | transformed the underpants type disposable diaper 1A of 1st Embodiment, and extended the outer layer sheet | seat 61 over the outer whole region of the absorptive main body 5, The outer packaging material 6 is formed.

  Moreover, in the underpants-type disposable diapers 1A and 1B of the first embodiment and the second embodiment described above, as shown in FIGS. 2 and 5, the overlapping portion 7 is formed of the outer packaging material 6. The top sheet 2 and the back sheet 3 that sandwich the absorber 4 without the material 6 may be extended over the entire outer region of the absorber 4, and the top sheet 2 and the back sheet 3 may be formed. .

  Further, in the pants-type disposable diaper 1A of the first embodiment described above, as shown in FIG. 3C, the side seal portion 8 includes a fusion portion 81 that extends in the width direction (X direction), and an inclination. However, the fused portion 82 may not be provided. In that case, as shown in FIG. 9, in the fusion part 82, the width of the fusion part 82 in the seal region 8a2 is preferably 0.5 mm to 2 mm, and the width of the fusion part 82 in the seal region 8a3 is larger. 0.5 mm to 3 mm is preferable, and the width of the fused portion 82 in the seal region 8a1 is preferably 1 mm to 4 mm. The interval between the fusion portions 82 in the seal region 8a2 is preferably 1 mm to 4 mm, the interval between the fusion portions 82 in the seal region 8a3 is preferably 1 mm to 3 mm, and the fusion in the seal region 8a1. The interval between the parts 82 is preferably 0.5 mm to 2 mm. Further, the side seal portion 8 may not have the fusion portion 82 that extends in an inclined manner, but may have only the fusion portion 81 that extends in the width direction (X direction).

  Moreover, in the underpants type disposable diaper 1A of the above-mentioned 1st Embodiment, as shown in FIG. 4, the side seal part 8 is formed by one embossing. The present invention also provides an advantage that a desired side seal can be obtained without applying an equipment load such as embossing a plurality of times by one embossing by changing the seal pattern for each part. However, the present invention is not limited to this. For example, the side seal portion 8 has an emboss roll having a convex portion corresponding to the shape of the seal region 8a1, and an emboss roll having a convex portion corresponding to the shape of the seal region 8a2. , And three embossing of an embossing roll provided with a convex portion corresponding to the shape of the seal region 8a3.

  In addition to the pants-type disposable diaper, the present invention can be suitably used for absorbent articles such as a pants-type sanitary napkin.

FIG. 1 is a perspective view of a pants-type disposable diaper according to the first embodiment of the present invention. FIG. 2 is a developed plan view showing a state where the pants-type disposable diaper shown in FIG. 1 is developed and extended. 3A is a cross-sectional view taken along the line Y1-Y1 in FIG. 2, FIG. 3B is a cross-sectional view taken along the line Y2-Y2 in FIG. 2, and FIG. 3C is an enlarged view of the side seal portion. It is a top view. FIG. 4 is a schematic view of an embossing roll forming a side seal portion of the pants-type disposable diaper shown in FIG. FIG. 5 is a developed plan view showing a state in which the pants-type disposable diaper according to the second embodiment of the present invention is developed and extended. 6A is a cross-sectional view taken along the line Y1-Y1 in FIG. 5, FIG. 6B is a cross-sectional view taken along the line Y2-Y2 in FIG. 5, and FIG. 6C is an enlarged view of the side seal portion. It is a top view. FIG. 7 is a developed plan view showing a state in which a pants-type disposable diaper according to another embodiment of the present invention is developed and extended. FIG. 8 is a developed plan view showing a state in which a pants-type disposable diaper according to another embodiment of the present invention is developed and extended. FIG. 9 is an enlarged plan view of a side seal part of a pants-type disposable diaper that is another embodiment of the present invention.

Explanation of symbols

1A, 1B Pants-type disposable diaper 2 Top sheet 3 Back sheet 4 Absorber 5 Absorbent body 51 Side cuff 52 52 Elastic member 6 for forming side cuffs Outer packaging material 6a, 6b Side edge 61 Outer layer sheet 61a, 61b Folding part 61a1 , 61b1 End edge 62 Inner layer sheet 62a, 62b Folded portion 62a1, 62b1 End edge 62c End in longitudinal direction (Y direction) 63 Waist elastic member 64 Leg elastic member 7 Superposed portion 8 Side seal portion 80a, 80b Emboss roll 80 Convex portion 9 Sweat absorption sheet

Claims (7)

It has a pair of side seal portions formed by fusing overlapping portions in which both side edge portions on the ventral side portion and both side edge portions on the back side portion are overlapped, and the overlapping portion is configured in the side seal portion It is a pants-type absorbent article in which there are different parts of the total basis weight of the member,
The superposed part is composed of a plurality of members, and the fusion area of the pair of side seal parts is a pant-type absorbent article that is smaller in a region where the total basis weight of each of the plurality of members is larger. The pant-type absorbent article includes a substantially longitudinal absorbent body having a top sheet, a back sheet, and an absorbent body interposed between both sheets, and an outer packaging material disposed on the back sheet side of the absorbent body. With
The outer packaging material has an outer layer sheet forming the outer surface of the pant-type absorbent article, and an inner layer sheet disposed on the inner surface side of the outer layer sheet,
The pants-type absorbent article according to claim 1, wherein the overlapping portion is formed of the outer packaging material.   3. The absorbent article according to claim 2, wherein the outer packaging material has a folded portion in which a longitudinally outer portion of the outer layer sheet or the inner layer sheet is folded back to the inner layer sheet side from the absorbent main body.   The pants-type absorbent article according to claim 2 or 3, wherein the overlapping portion is configured to include another member other than a member that forms the outer packaging material.   The pants-type absorbent article according to any one of claims 1 to 4, wherein a fusion strength of the side seal portion is 5 N / 30 mm to 40 N / 30 mm.   The minimum strength (Fmin / Fmax) of the fusion strength of the side seal portion with respect to the maximum strength of the fusion strength of the side seal portion is 2/3 <Fmin / Fmax≤1. The underpants type absorbent article according to any one of the above.   The pants-type absorbent article according to any one of claims 1 to 6, wherein the fusion component of the member constituting the polymerization portion is a component in the same series as polypropylene, polyethylene, or polyester.

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