JP2011120626A - Pants type absorbent article - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a disposable diaper sufficiently covering the hip part of a wearer on the back side of the wearer when it is worn, preventing a heat-sealed part from becoming hard, and having an excellent appearance. <P>SOLUTION: The diaper 1A includes an abdominal side sheet 2A, a back side sheet 2B and an absorbent body 3 fixed over the sheets 2A, 2B. The diaper 1A has a pair of side seal parts 4 for which both side edge parts 2a of the abdominal side sheet 2A and both side edge parts 2b of the back side sheet 2B are heat-sealed. The pair of side seal parts 4 are not contracted in the width direction. The back side sheet 2B has a back side extension part 21B extending downward from the side seal parts 4, and a pair of thermosetting parts 210 not contracted in the width direction are formed at both end parts 21b on the outer side in the width direction (X direction) of the back side extension part 21B. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

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

  As a conventional pants-type absorbent article, the outer package is divided into a ventral sheet that is disposed on the wearer's ventral side when worn, and a backside sheet that is disposed on the wearer's dorsal side when worn, Pants-type absorption in which the absorbent main body is fixed so as to be bridged between the abdominal sheet and the back sheet, and the left and right side edges of the abdominal sheet and the left and right side edges of the back sheet are joined Sexual articles are known. For example, Patent Literature 1 includes an annular elastic belt composed of a front belt portion and a rear belt portion and an absorbent main body as a pant-type absorbent article as described above, and a longitudinal portion of the rear belt portion (back seat). A pull-on garment is described in which the length in the direction is longer than the length in the longitudinal direction of the front belt portion (ventral side sheet). In Patent Document 1, the front belt portion and the rear belt portion constituting the annular elastic belt are both formed by simply cutting the elastic belt layer web, and the annular elastic belt is formed by the front belt portion and the rear belt portion. It is described that both side portions of each belt portion are joined by a seam.

  In such an absorbent article described in Patent Document 1, the longitudinal length of the rear belt portion is longer than the same length of the front belt portion (ventral side seat), so that the wearability of the wearer's buttocks is improved. Has been enhanced. However, in the absorbent article described in Patent Document 1, there is no description about the part joined by the seam, and the part joined by the seam contracts due to the contraction of the elastic belt layer web by simply joining. It becomes hard. Moreover, when the site | part joined by the seam shrinks, it will look bad.

Special table 2008-508082

  Accordingly, an object of the present invention is to provide a pants-type absorbent article in which the exterior body is divided into an abdominal sheet disposed on the wearer's belly side and a back sheet disposed on the wearer's back side. An object of the present invention is to provide a pant-type absorbent article that can sufficiently cover the wearer's buttocks on the back side of the wearer when worn, has a hard-sealed part, and has a good appearance.

  The present invention relates to an abdominal sheet disposed on the stomach side of the wearer when worn, a back sheet disposed on the back side of the wearer when worn, and an absorption fixed across the abdominal sheet and the back sheet. A pant-type absorbent article comprising a pair of side seal portions, each of which is heat-sealed on both side edges of the ventral sheet and the dorsal sheet. Each of the side sheets includes an outer layer sheet forming the outer surface of the pants-type absorbent article, an inner layer sheet disposed on the inner surface of the outer layer sheet, and the both side edge portions between the outer layer sheet and the inner layer sheet. A plurality of thread-like elastic members arranged in an extended state, each of the pair of side seal portions is not contracted in the width direction, and the back seat is located below the side seal portions. It has a back extension part that extends, The both ends in the width direction outer side of the dorsal extending portion, there is provided a pant-type absorbent article in which a pair of thermoset part that does not shrink in the width direction is formed.

  According to the pant-type absorbent article of the present invention, the wearer's buttocks can be sufficiently covered on the back side of the wearer when worn, and the heat-sealed part is not hard and has a good appearance. Will improve.

FIG. 1 is a perspective view of a pants-type disposable diaper according to this embodiment of the present invention. FIG. 2 is a plan view of the pants-type disposable diaper shown in FIG. 1 as viewed from the top sheet side in an expanded state. 3A is a cross-sectional view taken along line Y1-Y1 in FIG. 1, and FIG. 3B is a cross-sectional view taken along line Y2-Y2 in FIG. 4 is a cross-sectional view taken along line XX of FIG. FIG. 5 is a diagram for explaining a heat-sealing method of the side seal part 4 and the thermosetting part 210.

  Hereinafter, the pants-type absorbent article of the present invention will be described based on the preferred embodiment with reference to FIGS.

The pants-type disposable diaper 1 (hereinafter, also referred to as “diaper 1”) of the present embodiment, as shown in FIG. 1, is a ventral sheet 2A disposed on the abdomen side of the wearer when worn, and the wearer when worn. A back side sheet 2B arranged on the back side of the back side, and an abdominal side sheet 2A and an absorbent main body 3 fixed over the back side sheet 2B. The side sheet 2B has a pair of side seal portions 4, 4 in which both side edges 2b, 2b are heat-sealed in a palm shape. As shown in FIG. 1, the diaper 1 is formed with a pair of side seal portions 4, 4 and a waist opening WO and a pair of leg openings LO, LO.
The diaper 1 is formed symmetrically with respect to the center line CL as shown in FIGS. Accordingly, in the following description, the right side of the symmetrical part will be mainly described.

  The diaper 1 of the present embodiment will be described in detail. The diaper 1 is in the longitudinal direction (hereinafter referred to as “Y direction” in the extended state (see FIG. 2). Y direction: refers to a direction parallel to the center line CL). In addition, when worn, it is located between the abdominal side A disposed on the abdomen side of the wearer, the back side B disposed on the back side of the wearer, and the abdominal side A and the back side B. The crotch part C is arranged in the crotch part of the wearer. The width direction of the diaper 1 is a direction orthogonal to the longitudinal direction (Y direction) (hereinafter referred to as “X direction”).

  As for the diaper 1 of this embodiment, the ventral sheet 2A includes a ventral sheet body 20A as shown in FIG. Specifically, the ventral seat body 20A has a long rectangular shape in the diaper width direction (X direction) in the extended state of the diaper 1 (see FIG. 2), and the left and right sides along the diaper longitudinal direction (Y direction). It has a pair of side edge parts 20a and 20a.

  In the present invention, the back seat 2 </ b> B includes a back extension portion 21 </ b> B that extends downward from the side seal portion 4. Specifically, as shown in FIG. 2, the back seat 2B includes a back seat body 20B and a back extension portion 21B that extends downward along the lower edge 200 of the back seat body 20B when worn. I have. Here, “downward” means a direction toward the center CT (see FIG. 2) of the diaper 1 in the longitudinal direction (Y direction) of the diaper 1. The back seat main body 20B has a long rectangular shape in the diaper width direction (X direction) in the extended state of the diaper 1 (see FIG. 2), and a pair of left and right side edges along the diaper longitudinal direction (Y direction). 20b, 20b. The back-side extending portion 21B extends downward from the back-side seat body 20B along the lower edge 200 of the back-side seat body 20B. In the extended state of the diaper 1 (see FIG. 2), the diaper width direction (X It has a long rectangular shape in the direction) and has a pair of left and right side edges 21b, 21b along the diaper longitudinal direction (Y direction).

  For the diaper 1 of the present embodiment, the side edges 2a, 2a of the ventral seat 2A and the side edges 2b, 2b of the back seat 2B are joined together to form a side seal portion 4, a waist opening WO, And a pair of leg openings LO, LO are formed. Specifically, the side edges 20a, 20a of the ventral seat body 20A and the side edges 20b, 20b of the back seat body 20B are joined throughout, and the side edges 21b, 21b of the back seat body 20B are Not joined. In this way, the side edge portions 20a, 20a of the ventral seat body 20A and the side edge portions 20b, 20b of the back seat body 20B are joined, and the diaper 1 is formed with a pair of side seal portions 4, 4. Is done.

  In the present invention, each of the pair of side seal portions 4 and 4 is not contracted in the width direction (X direction). As will be described later, each of the pair of side seal portions 4, 4 has a plurality of thread-like elastic members 24 extending in the X direction, but the pair of side seal portions 4, 4 is arranged. Each of 4 is not contracted in the width direction (X direction). The side seal portion 4 preferably does not contract completely in the width direction (X direction), but if the contraction rate in the width direction (X direction) is 25% or less, it is determined that the side seal portion 4 has not contracted.

[Measurement method of shrinkage rate of side seal part 4]
The shrinkage rate in the width direction (X direction) of the side seal portion 4 is measured as follows. The length A (mm) in the width direction (X direction) in the natural state of the side seal portion 4 is obtained, and the length B (mm) when extended in the width direction (X direction) is obtained. The contraction rate in the width direction (X direction) of the portion 4 is obtained from the following equation.
Shrinkage rate (%) = (B−A) / B × 100
The measurement is performed three times, and the average value is calculated as the contraction rate value in the width direction (X direction) of the side seal portion.

  The length in the longitudinal direction (Y direction) of the side seal portion 4 shown in FIG. 1 is the length L1 in the longitudinal direction (Y direction) of the ventral seat body 20A and the back seat body 20B as shown in FIG. It is the same, and is formed shorter than any length Lb in the longitudinal direction (Y direction) of the back seat 2B. The back side seat 2B is formed with a back side extending portion 21B having a length L2 in the longitudinal direction (Y direction) that extends downward from the side seal portion 4. The ventral sheet 2A is not formed with the ventral extension portion 21A, and the length La in the longitudinal direction (Y direction) of the ventral sheet 2A is the length in the longitudinal direction (Y direction) of the ventral sheet body 20A. It is the same as the length L1.

  From the viewpoint of covering the wearer's buttocks sufficiently on the back side of the wearer when wearing, the dorsal extension portion 21B of the diaper 1 has an extension start position of the wearer at the time of wearing the diaper 1. The position corresponding to the part is preferable. Specifically, the length L2 of the back extension portion 21B is preferably 5 to 150% of the length L1 of the side seal portion 4 (back side seat body 20B), and preferably 25 to 70%. Is more preferable. Furthermore, the length L2 of the back extension portion 21B is preferably 5 to 60% of the length Lb of the back seat 2B, and more preferably 20 to 40%. In addition, it is preferable that the extension length L2 of the back side extension part 21B is 10 mm or more, and it is more preferable that it is 20 mm or more.

  In the present invention, as shown in FIG. 2, each of the ventral sheet 2 </ b> A and the dorsal sheet 2 </ b> B includes an outer layer sheet 22 that forms the outer surface of the diaper 1, an inner layer sheet 23 disposed on the inner surface of the outer layer sheet 22, and an outer layer. A plurality of thread-like elastic members 24 arranged between the sheet 22 and the inner layer sheet 23 in an extended state over both side edges 2a, 2a of the ventral sheet 2A and both side edges 2b, 2b of the back sheet 2B. The abdomen seat 2A forms a waist stretchable part G1 and a waistline stretchable part G2, and the backside sheet 2B forms a waist stretchable part G1, a waistline stretchable part G2 and an extended part stretchable part G3. .

  In the diaper 1, as shown in FIG. 2, in the diaper 1, the waist stretchable part G <b> 1 is formed outward from both end portions 3 a and 3 a in the longitudinal direction (Y direction) of the absorbent main body 3. The waistline stretchable part G2 is formed below (inward) from both ends 3a, 3a in the longitudinal direction (Y direction) of the absorbent main body 3. Moreover, in the diaper 1, as shown in FIG. 2, as for the back seat | sheet 2B, the waist expansion-contraction part G1 is formed outward from the both ends 3a and 3a of the longitudinal direction (Y direction) of the absorptive main body 3 respectively. The extension part elastic part G3 is formed on the back side extension part 21B of the back seat 2B, and the waist extension part G2 is formed between the waist elastic part G1 and the extension part elastic part G3. Has been. The waist stretchable part G2 of each of the abdominal side sheet 2A and the back side sheet 2B and the extended part stretchable part G3 of the back side sheet 2B are at least the longitudinal direction of the absorbent main body 3 in the width direction (X direction) of the diaper 1. Stretchability is expressed in a portion located outward in the width direction (X direction) from both side edges.

In the present invention, as shown in FIGS. 1 and 2, both end portions 21b and 21b on the outer side in the width direction (X direction) of the back extension portion 21B are not contracted in the width direction (X direction). A pair of thermosetting portions 210 and 210 are formed. In the present invention, each of the pair of thermosetting portions 210 and 210 is not contracted in the width direction (X direction). As described above, each of the pair of thermosetting portions 210 and 210 is provided with a plurality of thread-like elastic members 24 in an extended state in the X direction, but the pair of thermosetting portions 210 and 210 is disposed. Each 210 is not contracted in the width direction (X direction). Here, although it is preferable that the thermosetting part 210 does not shrink | shrink completely in the width direction (X direction), if the shrinkage rate of the width direction (X direction) is 25% or less, it will judge that it has not shrunk | reduced.
The shrinkage rate of the thermosetting portion 210 is measured by the same method as the method for measuring the shrinkage rate of the side seal portion 4.

  In the diaper 1 of the present embodiment, as shown in FIGS. 1 and 2, the back-side extending portion 21 </ b> B is an elastic member in which the thread-like elastic member 24 is not arranged at the lower (inward) end portion 211. It has a member non-arrangement region 210B. The elastic member non-arrangement region shown in FIG. 2 from the viewpoint of sufficiently securing the length L2 of the dorsal extending portion 21B that extends downward when worn without forming a gather by contraction of the elastic member 24 in the form of a thread. The length L3 in the longitudinal direction (Y direction) of 210B is preferably 5 to 50%, more preferably 10 to 30% of the length L2 of the back-side extending portion 21B. The length L3 of the elastic member non-arrangement region 210B shown in FIG. 2 is preferably 5 mm or more, and more preferably 10 mm or more.

  In the diaper 1 of this embodiment, as shown in FIG. 1, each of a pair of side seal parts 4 and 4 and a pair of thermosetting parts 210 and 210 is formed continuously. Specifically, each of the side seal part 4 and the thermosetting part 210 is formed by thermal fusion, and is continuously formed without a space between the side seal part 4 and the thermosetting part 210. ing.

  In the diaper 1 of the present embodiment, as shown in FIGS. 3A and 3B, each of the pair of side seal portions 4 and 4 and the thermosetting portions 210 and 210 has a cross-sectional view. The other surface is formed in a planar shape as viewed in cross section. Specifically, as shown in FIG. 3A, the side seal portion 4 is provided with an uneven shape in cross-sectional view on the surface on the side of the ventral sheet 2 </ b> A formed from the outer layer sheet 22 and the inner layer sheet 23. A plane shape is formed on the surface on the back side sheet 2 </ b> B side formed from the outer layer sheet 22 and the inner layer sheet 23 in a sectional view. Similarly, as shown in FIG. 3B, the thermosetting portion 210 is provided with a concavo-convex shape in cross-sectional view on the surface on the outer layer sheet 22 side of the back sheet 2B, and the inner layer sheet 23 of the back sheet 2B. A planar shape is formed on the side surface in a cross-sectional view. In the diaper 1, as shown in FIG. 3A and FIG. 3B, the uneven convex shape of the side seal part 4 and the thermosetting part 210 is between the outer layer sheet 22 and the inner layer sheet 23. It substantially coincides with the arrangement position of the arranged elastic member 24.

  As shown in FIGS. 2 and 4, the absorbent main body 3 has a substantially vertically long rectangular shape, and includes a top sheet 31, a back sheet 32, an absorber 33 interposed between both sheets 31, 32, and an absorbent. Side cuffs 35 are provided along the longitudinal direction (Y direction) on both side portions 3b, 3b of the main body 3 in the longitudinal direction (Y direction). Specifically, in the diaper 1, as shown in FIG. 2, the absorbent main body 3 includes a liquid-permeable top sheet 31, a liquid-impermeable (poor liquid-permeable) back sheet 32, and both sheets 31, It is a substantially vertically long rectangular shape having an absorbent body 33 interposed between 32. As shown in FIG. 2, the absorbent body 33 has a rectangular shape that is long in the longitudinal direction (Y direction) of the diaper 1, and the top sheet 31 and the back sheet 32 are each in the longitudinal direction of the diaper 1 as shown in FIG. 2. It is a rectangular shape that is long in the (Y direction). As shown in FIG. 4, the top sheet 31 is longer in the width direction (X direction) than the back sheet 32, and the portions extending from both end edges in the width direction (X direction) of the absorber 33 are Folded to the non-skin contact surface side and joined to the back sheet 32, and the top sheet 31 and the back sheet 32 are joined to each other at portions extending from both end edges in the longitudinal direction (Y direction) of the absorber 33. . By joining in this way, the vertically long rectangular absorbent main body 3 is formed. As shown in FIG. 4, side cuffs 35, 35 made of a liquid-resistant or water-repellent and breathable material are provided on both side portions 3b, 3b in the longitudinal direction (Y direction) of the absorbent main body 3. Is provided. In the vicinity of the free end of each side cuff 35, an elastic member 34 is arranged in a state of extending in the longitudinal direction (Y direction). The side cuffs 35 are so-called three-dimensional gathers that stand on the free end side when the diaper is worn and prevent the liquid from flowing out in the width direction of the absorbent main body 3. As shown in FIG. 4, the end of the side cuff 35 opposite to the free end is the non-skin contact surface side of the absorber 33 and is fixed between the top sheet 31 and the back sheet 32. ing.

  As shown in FIGS. 2 and 4, the absorbent main body 3 is fixed over the abdominal sheet 2 </ b> A and the back sheet 2 </ b> B. Specifically, as shown in FIGS. 2 and 4, the length in the width direction (X direction) of each of the ventral seat 2 </ b> A and the back seat 2 </ b> B is the length in the width direction (X direction) of the absorbent main body 3. Longer than that. 2 and 4, the absorbent main body 3 is arranged so as to intersect with the abdominal sheet 2A, is fixed to the abdominal sheet main body 20A, and is arranged so as to intersect with the back side sheet 2B. It is fixed to the main body 20B and the back extension part 21B. As shown in FIGS. 2 and 4, the two side portions 3 b and 3 b of the absorbent main body 3 are not fixed to the abdominal seat body 20 </ b> A, the back seat body 20 </ b> B, and the dorsal extension portion 21 </ b> B. When the diaper is worn, the free end portion of the side cuff 35 is formed to stand up easily when the diaper is worn by contraction of the elastic member 34 arranged in the longitudinal direction (Y direction). In addition, each side part 3b, 3b of the absorptive main body 3 may be fixed to the ventral seat main body 20A, the back side seat main body 20B, and the back side extending portion 21B.

The forming material of the pants-type disposable diaper 1 of this embodiment is demonstrated.
The outer layer sheet 22 and the inner layer sheet 23 constituting the abdominal sheet 2A and the back sheet 2B can be used without particular limitation as long as they are normally used for absorbent articles such as disposable diapers. For example, as the outer layer sheet 22 and the inner layer sheet 23, a water-repellent nonwoven fabric or the like can be used.

  As the sheets forming the top sheet 31, the back sheet 32, the absorber 33 and the side cuffs 35 constituting the absorbent main body 3, respectively, as long as they are usually used for absorbent articles such as disposable diapers, in particular, Can be used without limitation. For example, a hydrophilic and liquid-permeable nonwoven fabric can be used as the top sheet 31, and a liquid-impermeable or water-repellent resin film or a laminate of a resin film and a nonwoven fabric is used as the back sheet 32. be able to. As the absorbent body 33, an absorbent core made of absorbent polymer particles and a fiber material covered with tissue paper (not shown) can be used. As the sheet for forming the side cuffs 35, a stretchable film, a nonwoven fabric, a woven fabric, or a laminated sheet thereof can be used.

  The elastic member 24 that forms the waist stretchable portion G1, the waistline stretchable portion G2, and the extended partial stretchable portion G3, and the elastic member 34 disposed on the side cuff 35 include natural rubber, polyurethane, and polystyrene-polyisoprene copolymer. , A polystyrene-polybutadiene copolymer, a thread-like stretchable material made of a polyethylene-α-olefin copolymer such as ethyl acrylate-ethylene, or the like can be used.

  The fixing means between the absorbent main body 3 and the abdominal sheet 2A and the back sheet 2B is usually an adhesive used for absorbent articles such as disposable diapers, fusion of heat embossing, ultrasonic embossing, high frequency embossing, etc. Means are used. Similarly, for fixing the top sheet 31, the back sheet 32, and the side cuffs 35, an adhesive used for an absorbent article such as a disposable diaper, or a fusion means such as heat embossing, ultrasonic embossing, high frequency embossing, or the like is used. .

  As a heat sealing method of the side seal part 4 and the thermosetting part 210, heat embossing, ultrasonic embossing, high frequency embossing, or the like is used. In the diaper 1, as shown in FIG. 5, a pair of ultrasonic embossing rolls 5a. , 5b are used. Specifically, the convex portion 40 formed so as to correspond to the concave and convex shape of the side seal portion 4 shown in FIG. 3A and the concave and convex shape of the thermosetting portion 210 shown in FIG. Between the embossing roll 5a and the flat roll 5b having a flat surface, the continuous body of the belt-like diaper 1 is passed, and the side edge 2a of the abdominal sheet 2A and the side edge 2b of the back sheet 2B are overlapped. By embossing with the convex part 40 and the flat roll 5b of the embossing roll 5a, the concave / convex shape of the side seal part 4 and the concave / convex shape of the thermosetting part 210 are continuously attached to the ventral side A side of the diaper 1. After the temperature of the heat-sealed part is sufficiently lowered below the melting point, the continuous diaper 1 is cut into the size of each diaper 1 by a known cutting means (not shown) Side seal 4 that does not shrink in the direction and To form a cured portion 210. As a method for sufficiently lowering the temperature of the heat-sealing part, there is a means for securing a cooling time by keeping a distance between the ultrasonic embossing rolls 5a, 5b and a cutting means in the next process, or blowing air.

  As described above, the side seal portion 4 is formed by heat-sealing the overlap between the side edge portion 20a of the ventral seat body 20A and the side edge portion 20b of the back seat 2B. Only the side edge portion 21b of the back-side extension portion 21B is heat-sealed. Here, the abdominal sheet main body 20A, the back side sheet main body 20B, and the back side extending portion 21B each include an outer layer sheet 22, an inner layer sheet 23, and a thread-like elastic member 24. As shown, the side seal part 4 is thicker than the thermosetting part 210. Therefore, in order to equalize the seal strength of the side seal portion 4 and the seal strength of the thermosetting portion 210, the height of the portion of the flat roll 5b corresponding to the thermosetting portion 210 is set to the flat corresponding to the side seal portion 4. The seal strength of the thermosetting portion 210 may be increased by increasing the height of the portion of the roll 5b. In addition, when the side seal part 4 and the thermosetting part 210 are not continuous, the pair which consists of the embossing roll and flat roll provided with the convex part formed so that the uneven | corrugated shape of the side seal part 4 might be corresponded. Two pairs of ultrasonic embossing rolls, and a pair of ultrasonic embossing rolls composed of a flat roll and an embossing roll provided with convex portions formed so as to correspond to the concavo-convex shape of the thermosetting portion 210 It can be formed by using a roll.

The effect at the time of using the underpants type disposable diaper 1 of embodiment of this invention mentioned above is demonstrated.
As shown in FIG. 1, the diaper 1 of the present embodiment includes an abdominal sheet 2 </ b> A that is disposed on the abdomen side of the wearer when worn, a back sheet 2 </ b> B that is disposed on the dorsal side of the wearer when worn, Since it is a pants-type disposable diaper comprising the absorbent main body 3 fixed via the fixing part 4 over the side sheet 2A and the back sheet 2B, it is easy to move the leg. Moreover, since the diaper 1 of this embodiment is provided with the back side extension part 21B extended below from the side seal part 4, as shown in FIG. It can be fully coated. Further, in the diaper 1 of the present embodiment, the pair of side seal portions 4 and 4 are not contracted in the width direction (X direction), and the pair of thermosetting portions at both end portions 21b and 21b of the back-side extending portion 21B. Since 210 and 210 do not shrink in the width direction (X direction), the heat-sealed portion does not shrink, is not hard, and has a good appearance.

  Moreover, in the diaper 1 of this embodiment, as shown in FIG. 1, each of a pair of side seal parts 4 and 4 and a pair of thermosetting parts 210 and 210 is formed continuously. Therefore, the shrinkage due to the contraction of the elastic member 24 of the entire back extension portion 21B can be prevented by the pair of side seal portions 4 and 4 as well as the pair of thermosetting portions 210 and 210. It is possible to sufficiently cover the buttocks.

  Moreover, in the diaper 1 of this embodiment, as shown to FIG.1, FIG.3 (a), FIG.3 (b), a pair of side seal parts 4 and 4 and the thermosetting parts 210 and 210 each are abdominal side. The surface on the part A side is formed in a concavo-convex shape when viewed in cross section, and the surface on the back side part B side is formed in a flat shape when viewed in cross section. Therefore, the pair of side seal portions 4 and 4 are easily bent toward the back side A side. As described above, since each of the pair of side seal portions 4 and 4 and each of the pair of thermosetting portions 210 and 210 are continuously formed, contraction due to contraction of the elastic member 24 of the entire back side extension portion 21B. Therefore, the wearer's buttocks can be sufficiently covered.

  The pants-type disposable diaper of the present invention is not limited to the pants-type disposable diaper of the above-described embodiment, and can be appropriately changed.

  For example, in the pants-type disposable diaper 1 of the above-mentioned embodiment, as shown in FIGS. 1 and 2, the back extension portion 21 </ b> B has the elastic member non-arrangement region 210 </ b> B, but does not have it. Also good.

  Moreover, in the underpants type disposable diaper 1 of above-mentioned embodiment, as shown in FIG. 1, each of a pair of side seal parts 4 and 4 and each of a pair of thermosetting parts 210 and 210 are formed continuously. However, it may not be continuous.

  Moreover, in the underpants type disposable diaper 1 of the above-mentioned embodiment, as shown to Fig.3 (a) and FIG.3 (b), each of a pair of side seal parts 4 and 4 and the thermosetting parts 210 and 210 is one side. Is formed in a concavo-convex shape in cross-sectional view, and the other surface is formed in a planar shape in cross-sectional view, but is not limited to these shapes, for example, even if both surfaces are planar, An uneven shape may be used. Moreover, you may change the uneven | corrugated shape of the side seal part 4 and the uneven | corrugated shape of the thermosetting part 210. FIG.

  The pant-type absorbent article may be a pants-type sanitary napkin or the like in addition to a pants-type disposable diaper for infants or adults.

DESCRIPTION OF SYMBOLS 1 Pants type disposable diaper 2A Abdominal sheet 20A Abdominal sheet main body 200 Lower edge 20 of abdominal sheet main body 21a Side edge part of abdominal sheet main body 21A Abdominal extension part 201 Lower edge 21 of abdominal extension part 21a Abdominal extension Side edge 2B of the protruding portion Back side seat 20B Back side seat main body 200 Lower edge 20b of the back side seat main body Side edge portion 21B of the back side seat main body 21B Back side extending portion 201 Bottom edge of the back side extending portion 21b Back side Side edge portion of extended portion 210B Elastic member non-arrangement region 210 Thermosetting portion 211 Lower (inward) end portion of back side extended portion 22 Outer layer sheet 23 Inner layer sheet 24 Elastic member 3 Absorbent body 3a Absorbent body 3a End portion 3b in the longitudinal direction (Y direction) Side portion 31 in the longitudinal direction (Y direction) of the absorbent main body 31 Top sheet 32 Back sheet 33 Absorber 34 Elastic member 35 Side cuff 4 Side seal portion 4 Convex portions 5a, 5b ultrasonic embossing roller A ventral, B dorsal center line extending in the longitudinal direction of the C crotch portion CL diaper, the center of the CT diaper

Claims (4)

An abdominal sheet disposed on the abdomen of the wearer when worn, a dorsal sheet disposed on the dorsal side of the wearer when worn, and an absorbent main body fixed across the abdomen sheet and the dorsal sheet A pants-type absorbent article having a pair of side seal parts in which both side edges of the ventral sheet and the back sheet are heat-sealed,
Each of the ventral sheet and the dorsal sheet includes an outer layer sheet forming the outer surface of the pant-type absorbent article, an inner layer sheet disposed on the inner surface of the outer layer sheet, and between the outer layer sheet and the inner layer sheet. A plurality of thread-like elastic members arranged in an extended state across the both side edges,
Each of the pair of side seal portions is not contracted in the width direction,
The back seat includes a back side extending portion that extends downward from the side seal portion, and is not contracted in the width direction at both ends of the back side extending portion in the width direction. A pants-type absorbent article in which a pair of thermosetting parts are formed.   The pants-type absorbent article according to claim 1, wherein each of the pair of side seal portions and each of the pair of thermosetting portions are continuously formed.   Each of the pair of the side seal part and the thermosetting part is formed in a concavo-convex shape with one surface viewed in cross section, and the other surface is formed in a planar shape when viewed in cross section. The pants-type absorbent article described in 1.   The pants-type absorbent article according to any one of claims 1 to 3, wherein the back-side extending portion has an elastic member non-arrangement region in which the thread-like elastic member is not disposed at a lower end thereof. .

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