JP6189110B2 - Pants-type wearing article - Google Patents

Description

  The present invention relates to a pants-type wearing article having a side seal portion.

  A conventional pant-type wearing article includes an absorbent main body and an exterior body that forms the outer surface of the wearing article, and both side edges of the exterior body in the front body and both side edges of the exterior body in the back body are joined together. A pants-type disposable diaper in which a side seal portion is formed is known.

  Conventionally, in the manufacturing process of absorbent articles such as disposable diapers and sanitary napkins, a heat roll device has been widely used for joining stacked sheets. It is formed. As other joining methods, a method using ultrasonic welding (for example, Patent Document 1) and a method using laser light (for example, Patent Document 2) are also known.

  A pants-type disposable diaper is usually manufactured through the following steps. That is, a diaper continuous body having a structure in which a plurality of diapers are connected in one direction (conveying direction), such as a diaper continuous body indicated by reference numeral 10 in FIG. After the front body side exterior body and the back body side exterior body that overlap each other are joined by a joining means such as a heat roll device, the joined portion is cut by a cutting means such as a cutter, thereby dividing into individual diapers. It is manufactured through the process of. The conventional pants-type disposable diaper manufactured in this way (the cut edge portion of the joint produced by cutting by the cutting means) has the left and right side edges of the front body and the left and right side edges of the back body joined together when the diaper is worn. It protrudes from the outer surface of the diaper in an overlapping shape.

JP 2006-82556 A JP 2010-188629 A JP 2000-14697 A

  In recent years, pants-type disposable diapers have been desired to have the same appearance as normal underwear. However, the pants-type disposable diaper has a side seal portion that does not exist in normal underwear. However, the conventional side seal portion protrudes outward from the diaper rather than the peripheral portion, and is very conspicuous in the appearance of the diaper. Because of its existence, underpants-type disposable diapers are difficult to say with the same appearance as underwear.

  Moreover, when removing pants-type absorbent articles such as pants-type disposable diapers for the purpose of disposal, the side seal portions are torn in the vertical direction. However, in the conventional pant-type absorbent article, the tear of the sheet proceeds in the lateral direction while tearing the side seal portion in the longitudinal direction, and the tear of the sheet extends to the inner part of the diaper than the side seal portion. Sometimes it reaches the side edge of the diaper. When such a lateral tear occurs, it becomes difficult to tear the side seal portion smoothly in the longitudinal direction of the diaper. For example, the user has to reapply force to tear the side seal portion in the longitudinal direction again. It takes time and effort to break the side seal portion. As a technique for preventing such lateral tearing, a method of devising a formation pattern of a fusion part formed on the side seal part, or a method of providing a second joint portion extending in the vertical direction in parallel with the side seal part ( Patent Document 3) has been proposed. However, the method of devising the formation pattern of the fused portion of the side seal portion makes it difficult to reduce the width of the side seal portion to make it look like underwear, and the method of providing the second bonding site is also like underwear Making the appearance more difficult.

  Therefore, the present invention relates to a pants-type wearing article that is unlikely to cause lateral tearing of a side seal portion and can be easily and smoothly removed after use.

  The present invention includes an exterior body that forms the outer surface of a worn article, and a pair of side seal portions, a waist opening, and both side edges of the exterior body in the front body and both side edges of the exterior body in the back body are joined together A pants-type wearing article in which a pair of leg openings are formed, wherein the side seal portion includes an edge portion of the exterior body in the front body and an edge portion of the exterior body in the back body in the longitudinal direction of the side seal portion. From the side close to the wearer's skin of the wearing article in a cross section orthogonal to the direction in which the side seal portion extends. When the direction toward the far side is the inside / outside direction P and the direction perpendicular to the inside / outside direction P is the thickness direction Q, both ends in the thickness direction Q and the skin between the both ends are closest to the wearer's skin Inward and outward direction between inner end Distance along Dw is between the opposing part at the outer edge of the inner end and said fusing portion is distance Dc least along the inner and outer direction P, there is provided a pants-type wearing article.

  According to the present invention, there is provided a pants-type wearing article that is unlikely to cause lateral tearing of the side seal portion and can be easily and smoothly removed after use.

FIG. 1 is a perspective view schematically showing a pants-type disposable diaper which is an embodiment of a pants-type wearing article of the present invention. FIG. 2 is a cross-sectional view schematically showing a cross section taken along line II of FIG. FIG. 3 is a plan view schematically showing an unfolded and extended state of the diaper shown in FIG. FIG. 4 is a cross-sectional view showing a cross section orthogonal to the direction in which the side seal portion extends, showing the side seal portion of the diaper shown in FIG. 1 and the vicinity thereof. FIG. 5 is a perspective view schematically showing a manufacturing process of a diaper continuous body in the manufacture of the diaper shown in FIG. FIG. 6 is a perspective view showing a laser-type joining device preferably used for manufacturing the pant-type wearing article of the present invention and a state in which a diaper continuous body is melted using the same. Figure 7 (a) ~ FIG. 7 (c), respectively, at the same time side seal portion and to divide the diaper continuum (band-like outer package) using a laser-type bonding apparatus shown in FIG. 6 (sealing edge) It is explanatory drawing explaining a mode that it forms.

  Hereinafter, the present invention will be described based on preferred embodiments with reference to the drawings. The pants-type disposable diaper 1 which is one embodiment of the pants-type wearing article of the present invention includes an absorbent main body 2 and an exterior body 3 that forms the outer surface of the wearing article, as shown in FIGS. Left and right side edges A1, A1 along the longitudinal direction X of the exterior body 3 in the front body F (ventral side 1A) and left and right side edges along the longitudinal direction X of the exterior body 3 in the rear body R (back side part 1B) A pants-type disposable diaper in which B1 and B1 are joined to form a pair of side seal portions 4 and 4, a waist opening 8 and a pair of leg openings 9 and 9. The exterior body 3 is positioned on the non-skin contact surface side of the absorbent main body 2 and fixes the absorbent main body 2.

  The diaper 1 has a longitudinal direction X corresponding to the wearer's front-rear direction and a lateral direction Y perpendicular to the wearer's front-rear direction in a developed and extended plan view as shown in FIG. The diaper 1 can be divided into a crotch part 1C arranged at the crotch part at the time of wearing, and an abdominal side part 1A and a back side part 1B located in the longitudinal direction X. The exterior body 3 in the crotch part 1 </ b> C is formed with recesses for forming leg openings 9, 9 at the left and right side edges along the vertical direction X. As shown in FIG. 4, the diaper 1 can be divided into a front body F and a back body R with a virtual center line CL that bisects the diaper 1 in the vertical direction X as a boundary.

  In addition, in this specification, a skin contact surface is a surface directed to a wearer's skin side at the time of wearing in a pants type wearing article or its constituent member (for example, an absorptive main part), and a non-skin contact surface is In the pants-type wearing article or its constituent members, it is a surface directed to the side opposite to the wearer's skin side (clothing side) when worn. In the diaper 1, the vertical direction X corresponds to the direction (longitudinal direction) along the long side of the absorbent main body 2 which is a disposable diaper or its constituent member, and the horizontal direction Y is the absorbent which is a disposable diaper or its constituent member. It coincides with the width direction of the main body 2.

  As shown in FIG. 3, the absorbent main body 2 has a vertically long shape in one direction (longitudinal direction X), and a surface sheet (not shown) that forms a skin contact surface; A back sheet (not shown) that forms a non-skin contact surface, and a liquid-retaining absorbent (not shown) interposed between the two sheets. And has a long shape in the same direction. The absorbent main body 2 is joined to a central portion of the outer package 3 by a known joining means (adhesive or the like) so that the longitudinal direction thereof coincides with the longitudinal direction X of the diaper 1 in the unfolded and extended state. Here, the expanded and extended state means that the side seal portion is peeled off, the diaper is set in the expanded state, the elastic member of each part is expanded in the expanded diaper, and the design dimensions (the influence of the elastic member is eliminated at all). In this state, it is expanded until it becomes the same size as when expanded in a flat shape.

  As shown in FIGS. 2 and 3, the outer package 3 is disposed on the outer layer sheet 31 that forms the outer surface of the diaper 1 (the non-skin contact surface of the outer package 3), and the inner surface side of the outer layer sheet 31. An inner layer sheet 32 that forms the inner surface of 1 (skin contact surface of the exterior body 3), and a plurality of thread-like or belt-like elastic members 5, 6, and 7 fixed between the sheets 31 and 32 with an adhesive. It is configured to include. The two sheets 31 and 32 are joined to each other at a predetermined site by an adhesive or heat seal (not shown).

  The exterior body 3 (the outer layer sheet 31 and the inner layer sheet 32) includes a resin material and is formed using the resin material as a main component. As an example of the outer package 3 (the outer layer sheet 31 and the inner layer sheet 32), the resin material includes a heat-sealable synthetic resin such as polyethylene, polyethylene terephthalate, and polypropylene, and includes a nonwoven fabric, a film, a laminate sheet of a nonwoven fabric and a film, and the like. The thing which becomes. Examples of the nonwoven fabric include air-through nonwoven fabric, heat roll nonwoven fabric, spunlace nonwoven fabric, spunbond nonwoven fabric, and melt blown nonwoven fabric.

  As shown in FIG. 2, the pair of side seal parts 4, 4 in the diaper 1 is formed so that the edge part of the exterior body 3 in the front body F and the edge part of the exterior body 3 in the back body R are the side seal parts 4. It has a seal edge portion 41 joined by a continuous linear fusion portion 40 extending in the longitudinal direction. The seal edge 41 in the diaper 1 is formed continuously over the entire length between the waist opening 8 and the leg opening 9 in each of the side seal portions 4 and 4. The fused portion 40 in the seal edge portion 41 is obtained by melting and solidifying constituent resins of the sheets in a state where the edge portions of a plurality of sheets (the outer layer sheet 31 and the inner layer sheet 32) constituting the exterior body 3 are overlapped. Is formed.

  As shown in FIGS. 2 and 4, the fused portion 40 in the seal edge portion 41 is a direction from the side closer to the wearer's skin of the wearing article to the side farther in the cross section orthogonal to the direction in which the side seal portion 4 extends. Is the inner and outer direction P, and when the direction perpendicular to the inner and outer direction P is the thickness direction Q, both ends 4a and 4b in the thickness direction Q and the most wearer's skin between the both ends 4a and 4b The distance Dw along the inner / outer direction P between the near inner end 4c and the distance Dc along the inner / outer direction P between the inner end 4c and the facing portion 4d ′ at the outer edge 4d of the fused portion is greater than or equal to the distance Dc. It is.

The distance Dw between the both end portions 4a and 4b and the inner end portion 4c in the thickness direction Q is a distance measured along a straight line parallel to the inner and outer directions P. Further, when the position of the end 4a on the front body 1A side and the position of the end 4b on the back body 1B side are different in the inside / outside direction P, the distance Dw for each of them is not less than the distance Dc. Is preferred.
The distance Dc is the distance between the inner end 4c and the portion 4d 'facing the inner end 4c at the outer edge 4d of the fused portion along a straight line parallel to the inner / outer direction P. To measure. A portion 4 d ′ opposite to the inner end portion 4 c is a portion where a straight line passing through the inner end portion 4 c and parallel to the inner / outer direction P intersects with the outer edge 4 d of the fused portion 40.
In addition, in the side seal part 4 of the diaper 1 of this embodiment, the position of the inner end part 4c of the suction part 40 in the thickness direction Q is the position of the end part 4a on the front body A side and the position on the rear body 1B side. Although it is in the center position that bisects the distance in the thickness direction Q with respect to the position of the end portion 4b, the inner end portion 4c in the present invention is biased from the center position toward any one of the end portions 4a and 4b. It may exist in a different position.

The distance Dw, the distance Dc, and the thickness Tc described later can be measured as follows.
[Measurement method of the distance Dw, the distance Dc, and the thickness Tc]
The distance Dw, the distance Dc, and the thickness Tc were measured by observing a cross section under a state where no load was applied with a microscope (VHX-1000 manufactured by KEYENCE Corp.) at a magnification of 50 to 200 times.
The distance Dw, the distance Dc, and the thickness Tc were measured for three different cross sections in the direction along the side seal portion 4, and the average value of the measured values was used as each value.
The dimension of each part is preferably measured to a unit of 0.01 mm.

By setting the distance Dw of the fused part 40 to be equal to or greater than the distance Dc, it is possible to reliably prevent lateral tearing when the side seal part is torn. Moreover, since the side seal portion is less likely to be laterally split, the diaper 1 of the present embodiment can be easily and smoothly removed after use.
As a result of conducting a tear test of the side seal part for a number of pants-type disposable diapers in which the side seal part was formed by fusing by laser light irradiation, the side seal part 4 is in the inner and outer direction P. The outer part H from the inner end 4c is more likely to break than the inner part G from the inner end 4c. In particular, the fiber form of the fused part 40 and the outer package 3 at the outer part H remains. It has been found that breakage is likely to occur in the boundary portion 4e with the portion and the fused portion 40.
As in this embodiment, the side seal portion is formed by increasing the cross-sectional area of the outer portion H from the inner end portion where the distance Dw is equal to or greater than the distance Dc and is likely to break. When tearing, it is possible to increase the probability of fracture occurring at or near the fused portion 40, and to significantly suppress the possibility of lateral tearing when tearing the side seal portion.

  The distance Dw is preferably larger than the distance Dc from the viewpoint of more reliably preventing the side seal portion 4 from tearing laterally. Further, the distance Dw is preferably 1.3 times or more of the distance Dc, more preferably 2.0 times or more, more preferably 3.0 times or more, and preferably 8.0 times or less, Preferably it is 4.0 times or less, Preferably it is 1.3 to 8.0 times, More preferably, it is 2.0 to 4.0 times.

Note that whether or not the side seal portion in the inner / outer direction P is more likely to break the portion H outside the inner end portion 4c than the portion G inside the inner end portion 4c is determined by the following break test. it can.
That is, the side seal part 4 and the neighboring parts on both sides thereof are cut out in a strip shape of 30 mm in the vertical direction of the diaper and 50 mm in the width direction of the diaper so that the side seal part 4 is located at the center. Using the Tensilon Tensile Tester (Orientec Co., Ltd., trade name “RTA-100”), the end part on the front body side and the end part on the back body side of the sample are gripped, and 180 opposite Pull in the direction at a pulling speed of 300 mm / min. In addition, this test is performed about five samples about each of a side seal part.
For each of the five samples, it is checked whether the position to break is the part H outside the inner end 4c or the part G inside the inner end 4c. When the number of broken samples is larger than the number of broken samples at the inner part G, the outer part H from the inner end 4c is more than the inner part G from the inner end 4c. When it is determined that the sample is broken easily and the number of samples broken at the inner portion G is larger than the number of samples broken at the outer portion H, the inner portion G from the inner end 4c , It is determined that it is easier to break than the portion H outside the inner end 4c.
In the disposable diaper according to the present embodiment, the thickness of the outer body H from the inner end 4c is larger than the thickness of the inner part G from the inner end 4c. small. As a result, when tearing the side seal portion, it is possible to increase the probability of the fracture occurring at or near the fused portion 40, and to significantly suppress the risk of lateral tearing when tearing the side seal portion. it can. The thickness at the inner portion G of the front portion and the rear portion of the portion H outside the inner end 4c can be measured in the same manner as the above-described distance Dw, distance Dc, and thickness Tc.

  In the diaper 1 of the present embodiment, the outer edge 4d of the fused portion 40 has a shape that is recessed inward in the inner / outer direction P. Therefore, it is easy to make the distance Dw equal to or greater than the distance Dc, and the visibility of the fused part 40 in the wearing state of the diaper 1 can be reduced, and the appearance of the diaper 1 is close to underwear. . Furthermore, the softness | flexibility of a melt | fusion part improves and the touch of the diaper 1 becomes softer.

Moreover, in the diaper 1 of the present embodiment, the distance Dw is equal to or greater than the thickness Tc of the fused portion 40 at the center position that divides the distance Dw into two equal parts. In the present invention, it is not essential that the distance Dw is equal to or greater than the thickness Tc. However, when the distance Dw is equal to or greater than the thickness Tc, a portion H that is likely to break outward from the inner end portion 4c. The cross-sectional area of the side seal portion 4 can be increased, and when the side seal portion 4 is torn, the possibility of breakage in the vicinity thereof can be further increased. .
From the viewpoint of more reliably preventing the side seal portion 4 from tearing, the distance Dw is preferably more than 5% of the thickness Tc, more preferably 10% or more, and from the viewpoint of flexibility. The distance Dw is preferably 50% or less of the thickness Tc, more preferably 30% or less, more specifically, more than 5% and preferably 50% or less, more preferably 10% or more and 30. % Or less.

  The distance Dw of the fused part 40 and the distance Dc of the fused part 40 are preferably smaller from the viewpoint of improving the flexibility and feel of the side seal part 4, for example, 2.0 mm or less. Preferably, it is less than 1.0 mm. On the other hand, the thickness is preferably 0.05 mm or more from the viewpoint of ensuring the sealing strength.

The reason for measuring the thickness Tc of the fused part 40 at the central position that bisects the distance Dw of the fused part 40 is to measure the thickness corresponding to each of various seal-shaped samples. This is because it can be done.
Further, the outer edge 4d of the fused portion 40 has a shape that is greatly depressed inward in the inner / outer direction P, and a part of the outer edge 4d is inward from a line that bisects the distance Dw of the fused portion 40. The thickness Tc of the fused portion includes the thickness of the space portion inside the line that bisects.

The diaper 1 mentioned above can be manufactured, for example with the manufacturing method demonstrated below.
The manufacturing method of the diaper 1 exists in the superposition | polymerization pressurization process which makes the formation planned site | part of the side seal part in the strip | belt-shaped exterior body 3 of the state which accumulated the front body side and the back body side into a pressurization state, and a pressurization state. By irradiating a laser beam through the light passing part 27 extending in a direction intersecting the conveyance direction A of the exterior body 3 to the site where the side seal portion is to be formed, the exterior body 3 is divided and the division is performed. A side seal portion forming step of forming the side seal portion 4 by fusing the cut edge portions of the laminated exterior body produced by the above. Moreover, the main body fixing process which fixes the absorptive main body 2 to the strip | belt-shaped exterior body 3 (the outer layer sheet | seat 31, the inner layer sheet | seat 32) is comprised before the superposition | polymerization pressurization process.

  More specifically, in the manufacturing method of the diaper 1, as shown in FIG. 5, in the polymerization pressurizing step, the belt-shaped outer package 3 (outer layer sheet 31, inner layer sheet 32) is folded in the width direction. The front body side and the back body side of the strip-shaped exterior body 3 to which the absorbent main body 2 is fixed are overlapped with each other, whereby “a precursor of a pants-type disposable diaper in which a side seal portion is not formed is unidirectional. A continuous diaper 10 "is produced. And in the said side seal part formation process, as shown in FIG. 6, the strip | belt-shaped exterior body 3 in this diaper continuous body 10 is divided | segmented (melting | fusing) separately by irradiation of the laser beam 30, and the division | segmentation is carried out. The pants comprising the exterior body 3 having a pair of side seal portions 4 and 4 by fusing the cut edges of the plurality of exterior bodies 3 (the outer layer sheet 31 and the inner layer sheet 32) in a laminated state generated by The mold disposable diaper 1 is continuously manufactured.

  More specifically, first, as shown in FIG. 5, a belt-like outer layer sheet 31 continuously supplied from a raw fabric roll (not shown) and continuously supplied from a raw fabric roll (not shown). Between the belt-like inner layer sheet 32 to be formed, the waist elastic member 5 forming the waist gather, the waist elastic member 6 forming the waist gather, and the leg elastic member 7 forming the leg gather have a predetermined elongation rate. A plurality of each are arranged in the stretched state. At this time, the leg elastic member 7 is arranged while forming a predetermined leg-circumferential pattern via a known swing guide (not shown) that reciprocates perpendicular to the sheet flow direction. Further, before the belt-like outer layer sheet 31 and the belt-like inner layer sheet 32 are overlapped, an adhesive coating machine (see FIG. (Not shown) to apply hot melt adhesive. Note that the elastic members such as the waist elastic member 5 and the waistline elastic member 6 are divided by the laser light irradiation on the sheets 31 and 32 (the portion where the side seal portion 4 is to be formed, reference numeral 10C in FIG. 7). In order to avoid inconveniences such as significant shrinkage of the elastic member after the division and disconnection of the elastic member, etc. It is preferable to apply an adhesive to the adhesive. The concave and convex regions 43 and 43 on both sides of the diaper 1 sandwiching the side seal portion 4 are provided with an adhesive between the outer layer sheet 31 and the inner layer sheet 32 in the vicinity of the portion where the side seal portion 4 is to be formed, and the elastic member 5. The elastic members 5 and 6 are contracted together with the sheets 31 and 32 after the cutting. A hot melt adhesive is intermittently applied to the waist elastic member 5 and the waist elastic member 6 by an adhesive application machine (not shown) before being arranged between the sheets 31 and 32. May be.

And as shown in FIG. 5, between the pair of nip rolls 11, 11, a belt-shaped outer layer sheet 31 and a belt-shaped outer layer sheet 5 in which a waist elastic member 5, a waistline elastic member 6 and a leg elastic member 7 are sandwiched in an expanded state. By feeding and pressurizing the inner layer sheet 32, the band-shaped exterior body 3 in which a plurality of elastic members 5, 6, 7 are arranged in an expanded state between the band-shaped sheets 31, 32 is formed.
In the formation process of the exterior body 3, a plurality of joint portions (not shown) for joining the belt-like outer layer sheet 31 and the belt-like inner layer sheet 32 between the two adjacent waistline elastic members 6 and 6, It is also preferable to use a convex roll and a corresponding joining means (not shown) such as an anvil roll.
Thereafter, if necessary, a plurality of waistline elastic members 6 and a plurality of leg portion elasticities are made by using elastic member precut means (not shown) so as to correspond to positions where the absorbent main body 2 described later is disposed. The member 7 is pressed and divided into a plurality of pieces so that the contraction function is not expressed. Examples of the elastic member precut means include an elastic member dividing portion used in the method for manufacturing a composite elastic member described in JP-A-2002-253605.

  Next, as shown in FIG. 5, an adhesive such as a hot melt adhesive is applied in advance to the absorbent main body 2 manufactured in a separate process, and the absorbent main body 2 is rotated 90 degrees to form a belt-shaped outer package. 3 is intermittently supplied and fixed on the inner layer sheet 32 constituting 3 (main body fixing step). Then, as shown in FIG. 5, a leg hole LO ′ is formed inside the annular portion that is annularly surrounded by the leg elastic member 7 in the strip-shaped exterior body 3 in which the absorbent main body 2 is disposed. This leg hole forming step can be carried out by using a technique similar to that in a conventional method for manufacturing this type of article, such as a rotary cutter and a laser cutter.

  Next, the belt-shaped exterior body 3 is folded in the width direction (a direction orthogonal to the conveyance direction of the exterior body 3). More specifically, as shown in FIG. 5, both side portions 3 a, 3 a along the transport direction of the strip-shaped exterior body 3 are folded back so as to cover both ends in the longitudinal direction of the absorbent main body 2. After fixing both ends in the longitudinal direction, the outer package 3 is folded in the width direction together with the absorbent main body 2 (polymerization step in the polymerization pressure step). In this way, the diaper continuous body 10 is obtained.

  Next, as shown in FIG. 6, the diaper continuous body 10 thus manufactured is irradiated with laser light using a laser bonding apparatus 20 to form a pair of side seal portions 4 and 4 (side seal portion). Forming step), a pants-type disposable diaper 1 having an exterior body 3 having a pair of side seal portions 4 is continuously manufactured.

The laser-type joining device 20 will be described. The laser-type joining device 20 is arranged in a hollow cylindrical roll 23 that is rotationally driven in the direction of arrow A, as shown in FIG. The irradiation head 35 which irradiates the laser beam 30 toward the cylindrical support member 21 forming the peripheral surface portion 23, and the belt type pressure device 26 including the endless pressure belt 24 (pressing member). ing.
The laser-type bonding apparatus 20 has an interval adjustment mechanism (not shown) that can increase or decrease the interval between the support member 21 (the peripheral surface portion of the cylindrical roll 23) and the pressure belt 24. By adjusting the interval, the support member The pressure applied to the diaper continuous body 10 (sheet laminate) can be appropriately adjusted by the pressure belt 21 and the pressure belt 24.

  The support member 21 forms a peripheral surface portion (contact portion with the workpiece) of the cylindrical roll 23, and is between a pair of annular frames 22, 22 that form both ends of the cylindrical roll 23 in the rotation axis direction. It is pinched and fixed. The support member 21 is made of a metal material such as iron, aluminum, stainless steel, or copper, or a material having heat resistance such as ceramics.

  The support member 21 has a light passage portion 27 through which laser light can pass. As shown in FIG. 6, the support member 21 has a slit-shaped opening 27 that penetrates the support member 21 in the thickness direction as a light passage portion. The opening 27 has a rectangular shape in plan view, and the longitudinal direction of the opening 27 intersects with the conveyance direction A of the diaper continuous body 10 (band-shaped exterior body 3). A plurality is formed at predetermined intervals in the circumferential direction of the cylindrical support member 21 so as to coincide with the direction parallel to the axial direction of the rotation shaft. The support member 21 allows the laser light to pass through the opening 27, but does not allow the laser light to pass (transmit) at portions other than the opening 27. As a method of forming the opening 27 in the support member 21, 1) etching, punching, laser processing, or the like at a predetermined position of the support member 21 made of a single annular member having the same length as the circumferential length of the annular frame 22. 2) The support member 21 is replaced with a single annular member, and a plurality of curved rectangular members are used as the support member 21, and the plurality of members are connected between the pair of frames 22, 22. In addition, a method of arranging the frame body 22 at a predetermined interval in the circumferential direction may be mentioned.

  The belt-type pressure device 26 includes an endless pressure belt 24 (pressing member) and three rolls 25a, 25b, and 25c that rotate in a state where the pressure belt 24 is stretched. The rolls 25a, 25b, and 25c may be drive rolls or driven rolls that rotate with the cylindrical roll 23. The pressure belt 24 moves at the same speed as the cylindrical roll 23 (supporting member 21) with one or more of the rolls 25 a, 25 b, 25 c as a rotational drive or with the cylindrical roll 23. The support member 21 and the pressure belt 24 are preferably maintained in a predetermined temperature range by air cooling, water cooling, or the like.

  As the pressure belt 24 (pressing member), a metal or resin belt having heat resistance capable of withstanding the heat generated during processing can be used, for example, a metal material such as iron, aluminum, stainless steel, or the like. Can be used. In addition, as the pressure belt 24, a belt that does not transmit the laser beam irradiated to the workpiece (strip-shaped outer package 3) is usually used. You can also.

  As shown in FIG. 6, an irradiation head 35 that irradiates a laser beam 30 toward the support member 21 that forms the peripheral surface portion of the cylindrical roll 23 is provided in the hollow portion of the hollow cylindrical roll 23. The irradiation head 35 is a galvano scanner (device having a mirror on the motor shaft) that freely scans the laser beam 30, a mechanism for moving the laser beam 30 back and forth in a direction parallel to the rotation axis of the cylindrical roll 23, laser beam A mechanism for moving the position (irradiation point) 30 on the support member 21 on the diaper continuous body 10 in the circumferential direction of the cylindrical roll 23, a mechanism for making the spot diameter of the laser light 30 constant on the circumferential surface of the cylindrical roll 23, and the like By having such a configuration, the laser irradiation mechanism can arbitrarily move the irradiation point of the laser light 30 in both the circumferential direction of the cylindrical roll 23 and the direction orthogonal to the circumferential direction. it can.

  As shown in FIG. 6, the diaper continuous body 10 includes a support member 21 that forms a peripheral surface portion of a cylindrical roll 23 that is rotationally driven in the direction of arrow A in a state where a predetermined tension is applied by a guide roll (not shown). After being transported by a predetermined distance in the circumferential direction by rotation of the cylindrical roll 23 so as to be wound around the support member 21, it is separated from the support member 21 by an unillustrated lead roll, nip roll or the like. . As described above, the diaper continuous body 10 is wound around the support member 21 forming the peripheral surface portion of the cylindrical roll 23 with a predetermined tension and is conveyed so as to be in pressure contact with the pressure belt 24. The portion sandwiched between the support member 21 and the pressure belt 24 and the vicinity thereof are in a state of being pressurized (compressed) in the thickness direction from before being divided by the laser light irradiation. For this reason, when the diaper continuous body 10 contains a nonwoven fabric, the diaper continuous body 10 can be more efficiently compressed, and as a result, the diaper continuous body 10 being compressed is irradiated with laser light. When this is divided, it becomes possible to fuse the cut edges of the plurality of sheets (exterior body 3) constituting the divided portion more reliably, and the side seal portion 4 can be fused. The strength is improved.

  In the embodiment shown in FIG. 6, while continuously conveying the diaper continuous body 10, one surface 10 a forms a peripheral surface portion of the cylindrical roll 23, and a slit-shaped opening 27 (through which the laser beam 30 can pass). Diaper continuum 10 (scheduled portion for forming side seal portion 4) brought into contact with the outer surface of support member 21 having a light passage portion and brought into a pressurized state by support member 21 and pressure belt 24 (pressing member). On the other hand, by irradiating the laser beam 30 from the support member 21 through the opening 27, the diaper continuous body 10 is divided, and at the same time, a plurality of sheets in the pressurized state generated by the division. The cut edges of the outer package 3 are fused together to form the side seal portion 4 (side seal portion forming step).

  FIG. 7 is a diagram for explaining how the side seal portion 4 (seal edge) is formed at the same time as the diaper continuous body 10 (band-shaped sheet laminate) is divided using the laser bonding apparatus 20. 7 (a) schematically shows a portion 10C (part where the side seal portion 4 is to be formed) scheduled to be divided by the laser beam 30 of the diaper continuous body 10 and its vicinity. 10 C of division | segmentation scheduled parts of the diaper continuous body 10 in the aspect of illustration are the centers of the longitudinal direction (conveyance direction A) in the area | region where the absorptive main body 2 of the diaper continuous body 10 is not arrange | positioned. Such a portion 10C to be divided includes an end portion of the waist opening 8 (see FIG. 1) and its vicinity, an eight-layer structure portion in which eight sheets are stacked, and the other portions are four sheets. It is a four-layer structure part that is superimposed. As shown in FIG. 7A, the four-layer structure portion includes two sheets (an outer layer sheet 31 and an inner layer sheet 32) constituting one exterior body 3 in the ventral side part 1A, and a back side part 1B. It consists of the same two sheets 31 and 32 that constitute one exterior body 3, and these four sheets are laminated. On the other hand, as described above, the eight-layer structure portion is folded so that both side portions 3a and 3a of the strip-shaped outer package 3 cover both longitudinal ends of the absorbent main body 2 when the diaper continuous body 10 is manufactured ( (See FIGS. 3 and 5), because there are two exterior bodies 3 on each of the abdominal part 1A and the back side part 1B, and these four exterior bodies 3, 3 are laminated, As a result, eight sheets 31 and 32 are laminated. In each of the four-layer structure portion and the eight-layer structure portion, elastic members such as the waist elastic member 5 and the waistline elastic member 6 may be interposed between the overlapping sheets 31 and 32. Hereinafter, the 4-layer structure portion will be mainly described, but unless otherwise specified, the 8-layer structure portion is configured in the same manner as the 4-layer structure portion, and the side seal portion 4 is formed.

  Other than the sheet constituting the outer layer sheet 31 and the one surface 10a constituting the one surface 10a (the contact surface with the support member 21) of the diaper continuum 10 in the planned division portion 10C of the four-layer structure in the diaper continuum 10 One or both of the sheets (inner layer sheet 32) absorb the laser beam 30 and generate heat. In the illustrated embodiment, all of the four sheets 31 and 32 constituting the parting planned portion 10 </ b> C are sheets (nonwoven fabrics) that absorb the laser beam 30 and generate heat. In addition, the two sheets of the outer layer sheet 31 and the inner layer sheet 32 that overlap each other in the vicinity of the portion 10C to be divided may be joined by an adhesive or the like before the irradiation with the laser beam 30, or may be joined at all. It is not necessary.

  As shown in FIG. 7 (b), the diaper continuous body 10 has one surface 10 a abutting against the support member 21, and a parting planned portion 10 </ b> C (part where the side seal portion 4 is to be formed) is on the slit-shaped opening 27. The pressure belt 24 (pressing member) is pressed against the other surface 10b so that it is conveyed in the direction of the arrow A while being introduced onto the support member 21 that rotates in the direction of the arrow A so as to be positioned in the direction of the thickness A. Pressure (compression). And the laser beam 30 is irradiated through the opening part 27 from the supporting member 21 side with respect to the parting part 10C to be divided in such a conveyance and pressurization state. As described above, the irradiation point of the laser beam 30 is configured to be arbitrarily movable in the circumferential direction of the cylindrical roll 23 and is set so as to follow the movement of the opening 27 along the circumferential direction. Therefore, the laser beam 30 is continuously irradiated for a certain period of time to the parting planned portion 10C located on the opening 27 during the conveyance.

  When the laser beam 30 is irradiated to the parting portion 10C having the four-layer structure, the forming materials (fibers, etc.) of the sheets 31 and 32 existing in the parting portion 10C are vaporized by the heat generated by the direct irradiation of the laser light 30 and disappear. The forming material existing in the vicinity of the parting portion 10 </ b> C is indirectly heated by the laser beam 30 and melted. As a result, as shown in FIG.7 (c), the parting plan part 10C of a four-layer structure is melted, and in a form in which a single sheet sheet laminate (diaper precursor) is cut from the diaper continuous body 10, At the same time that the diaper continuum 10 is divided, the cut edges of the four sheets 31 and 32 in the sheet laminate of the single sheets produced by the division, and the diaper continuous 10 separated. The cut edges of the four sheets 31 and 32 are fused together. Each of these cut edges is pressed (compressed) by being sandwiched between the support member 21 and the pressure belt 24 from before the formation (before the diaper continuous body 10 is divided by irradiation with the laser beam 30). ). According to the diaper manufacturing method of the illustrated embodiment, the strip-shaped exterior body 3 is divided by the single laser light irradiation, and the exterior body 3 in the two pressurized states generated by the division is thus obtained. In order to carry out the fusion of the cutting edges at the same time, the fusion and separation are the same with approximately half the laser output compared to the method of fusing the two fusion places with two laser irradiations. It can be carried out in a process, and the diaper 1 can be manufactured efficiently.

  The cut edges of the sheets 31 and 32 are heated and melted during the irradiation of the laser beam 30 and immediately after the end of the irradiation, but are separated from the diaper continuous body 10 by the irradiation of the laser beam 30. Each of the leaf diaper precursor and the diaper continuous body 10 is quickly cooled and solidified by the outside air after the irradiation is completed while the pressure state of the support member 21 and the pressure belt 24 is maintained, and the cutting is performed. The edge forming material (fiber or the like) becomes the fused portion 40 which is fused and integrated. Thus, by forming the fused part 40, one of the pair of side seal parts 4, 4 in one diaper 1 is formed. If necessary, the cutting edge portions of the sheets 31 and 32 may be forcibly cooled by using known cooling means such as a suction device and an exhaust device to promote the formation of the fused portion 40.

  When one portion 10C (scheduled portion where the side seal portion 4 is to be formed) is divided in this way, the laser beam 30 seems to hit another opening 27 adjacent to the irradiation direction in the direction opposite to the conveyance direction A. And is irradiated to another parting planned portion 10C located thereabove through the other opening 27. As a result, another part 10C to be divided is divided and fused in the same manner as described above, and the other side seal part 4 (fused part 40) that forms a pair with the previously formed side seal part 4 is formed. Thereafter, by repeating the same operation, the pants-type disposable diaper 1 including the exterior body 3 having the pair of side seal portions 4 and 4 is continuously manufactured.

In the diaper 1 manufactured in this way, the edge part A1 of the exterior body 3 in the front body F and the edge part B1 of the exterior body 3 in the rear body R extend to the side seal part 4 in the longitudinal direction of the side seal part. A sealing edge 41 is formed which is joined by a continuous linear fusion part 40.
Further, in order to obtain the seal edge portion 41 (side seal portion 4) having the fused portion 40 in which the distance Dw is equal to or greater than the distance Dc, a laser is applied while pressurizing the vicinity of the parting planned portion 10C of the diaper continuous body 10. It is preferable to release the pressurized state after irradiation of light and transporting the laminate in which the fibers at the cut end are melted while maintaining the pressurized state and the molten resin is solidified. . The seal edge portion 41 thus obtained has a shape in which the outer edge 4d of the fused portion 40 is recessed toward the inside of the wearing article in a cross section orthogonal to the direction in which the side seal portion 4 extends when worn. Have. From the viewpoint of promoting the solidification of the molten resin, it is preferable to press the diaper continuum by applying a metal member having excellent thermal conductivity to at least one surface, or to cool the diaper continuous body by air equipment or the like.
Further, in order to obtain the seal edge portion 41 (side seal portion 4) having the fused portion 40 in which the recording distance Dw is equal to or greater than the distance Dc, the laser intensity is increased, the laser output is increased, and the scanning speed is increased. It is also preferable to slow down.

  In addition, as shown in FIG. 4, the sealing edge part 41 in the diaper 1 obtained by said manufacturing method left the component fiber of the exterior body 3 fiber shape outside the melt | fusion part 40 in the inner / outer direction P. Has no part. Therefore, the visibility of the fusion | melting part 40 in the wearing condition of the diaper 1 can be reduced, and the external appearance of the diaper 1 becomes a thing close to underwear.

  The diaper 1 having a pair of side seal portions 4 and 4 obtained through a process in which the outer body 3 is divided and welded at the same time is excellent in the flexibility and touch of the side seal portion 4, and the feeling of wear Is good.

Explaining the laser beam, the wavelength of the laser beam irradiated to the diaper continuous body 10 (band-shaped outer package 3) is absorbed by the sheets (outer layer sheet 31 and inner layer sheet 32) constituting the outer package 3 and generates heat. The laser beam is used. Here, the “sheet constituting the exterior body” is not limited to the sheet (for example, the outer layer sheet 31 in the above-described embodiment) constituting one surface of the exterior body (the contact surface with the support member 21). Any sheet may be used as long as the sheet is configured. Whether or not the laser light applied to the exterior body is a wavelength that is absorbed by the sheet and generates heat for the individual sheets constituting the exterior body depends on the material of the sheet and the wavelength of the laser light to be used. It depends on the relationship. When the sheet constituting the outer package is a non-woven fabric or film made of synthetic resin that is widely used in the manufacture of absorbent articles (sanitary products) such as disposable diapers and sanitary napkins, the laser beam may be CO ₂ laser, YAG It is preferable to use a laser, an LD laser (semiconductor laser), a YVO4 laser, a fiber laser, or the like. Moreover, when the sheet | seat which comprises an exterior body contains polyethylene, a polyethylene terephthalate, a polypropylene etc. as a synthetic resin, as a wavelength which can be absorbed by this sheet | seat and can make this sheet | seat generate | occur | produce favorably, 8.0 micrometers or more and 15. It is preferable to use 0 μm or less, and it is particularly preferable to use an oscillation wavelength of 9.0 μm or more and 11.0 μm or less of a CO ₂ laser in which a high-power laser device exists. The spot diameter of laser light, laser output, and the like can be appropriately selected in consideration of the material and thickness of the sheet constituting the exterior body.

  As mentioned above, although this invention was demonstrated based on the embodiment, this invention can be suitably changed without being restrict | limited to embodiment mentioned above.

For example, a strip-shaped outer package (sheet laminate) is a stack of four sheets as shown in FIG. 7 (a), or two, three, or five or more sheets. May be.
Moreover, as shown in FIG. 3, the exterior body 3 in the embodiment (aspect) is not divided into the abdominal part 1A and the dorsal part 1B, but the abdominal part 1A, the crotch part 1C, and the dorsal part 1B. However, the exterior body in the present invention is not limited to such a continuous shape, and is, for example, the stomach side disposed on the wearer's stomach side (front side). It is divided | segmented into the sheet | seat member and the back | dorsal sheet | seat member distribute | arranged to a wearer's back | dorsal side (rear side), and the absorptive main body may be bridge | crossed and fixed to these both sheet | seat members. In the method for producing a pants-type disposable diaper having such a split-type exterior body, the polymerization pressurizing step includes a front body side (a belt-like stomach side sheet member) of the belt-like exterior body to which the absorbent main body is fixed. A site where the side seal portion is to be formed in the belt-shaped exterior body having a configuration in which the back body side (band-shaped backside sheet member) is superimposed is brought into a pressurized state.

  Moreover, in the said embodiment, before implementation of the said superposition | polymerization pressurization process, as shown in FIG. 5, both side part 3a, 3a along the conveyance direction of the strip | belt-shaped exterior body 3, ie, strip | belt-shaped outer-layer sheet | seat 31 and strip | belt-shaped. Although the both side parts along the conveyance direction of each inner layer sheet 32 were folded back so as to cover both ends in the longitudinal direction of the absorbent main body 2, the width direction (longitudinal direction) of the band-shaped outer layer sheet 31 was more than the band-shaped inner layer sheet 32. Absorbs only the extension part of the outer layer sheet 31 that extends outward from the side edge of the inner layer sheet 32 when the sheets 31 and 32 are overlapped. The body 2 may be folded back so as to cover both ends in the longitudinal direction. In that case, the parting plan part 10C of the diaper continuous body 10 is a six-layer structure part in which the opening end part of the waist opening part 8 and its vicinity are overlapped with six sheets, and the other part is four sheets. Becomes a four-layer structure part. Moreover, the both side parts 3a and 3a along the conveyance direction of the strip | belt-shaped exterior body 3, ie, the both sides along the conveyance direction of each of the strip | belt-shaped outer layer sheet 31 and the strip | belt-shaped inner layer sheet | seat 32 do not need to be folded.

In addition, the pant-type wearing article in the present invention is not limited to a pant-type disposable diaper, and may be a pant-type sanitary napkin. It may be a diaper cover or the like that does not include
The description omitted in one embodiment described above and the requirements of only one embodiment can be applied to other embodiments as appropriate, and the requirements in each embodiment can be appropriately changed between the embodiments. Can be substituted.

  Regarding the embodiment (aspect) of the present invention described above, the following additional notes (pants-type wearing articles) are disclosed.

<1>
An exterior body that forms the outer surface of the wearing article is provided, and a pair of side seal portions, a waist opening portion, and a pair of leg openings are formed by joining both side edges of the exterior body in the front body and both side edges of the exterior body in the back body A pants-type wearing article in which a part is formed,
The side seal portion is formed from a seal edge portion in which the edge portion of the exterior body in the front body and the edge portion of the exterior body in the back body are joined by a continuous linear fusion portion extending in the longitudinal direction of the side seal portion. Become
In the cross-section orthogonal to the direction in which the side seal portion extends, the fusion part is defined as a direction from the side closer to the wearer's skin of the wearing article to a side far from the inner and outer direction P, and a direction orthogonal to the inner and outer direction P. When the thickness direction Q is used, the distance Dw along the inner / outer direction P between the both end portions in the thickness direction Q and the inner end portion closest to the wearer's skin between the both end portions is the inner end portion. The underpants type wearing article which is more than the distance Dc along the inner / outer direction P between the part and the facing part at the outer edge of the fusion part.
<2>
Both ends in the thickness direction Q of the fused part are the distance Dw for each of the end part on the front body side and the end part on the back body side, which is not less than the distance Dc. Pants-type wearing article as described.
<3>
The pants-type wearing article according to <1> or <2>, wherein the distance Dw is larger than the distance Dc.
<4>
The distance Dw is preferably 1.3 times or more of the distance Dc, more preferably 2.0 times or more, more preferably 3.0 times or more, preferably 8.0 times or less, more preferably It is 4.0 times or less, preferably 1.3 to 8.0 times, more preferably 2.0 to 4.0 times, any one of <1> to <3> Pants-type wearing article.
<5>
Any one of <1> to <4>, wherein the outer edge of the fused portion has a shape recessed toward the inner side in the inner and outer directions in a cross section orthogonal to the direction in which the side seal portion extends. The pants-type wearing article according to 1.
<6>
The underpants-type wearing article according to any one of <1> to <5>, wherein the distance Dw is equal to or greater than the thickness Tc of the fusion part at a central position that bisects the distance Dw.
<7>
The distance Dw is preferably more than 5% of the thickness Tc, more preferably 10% or more, and the distance Dw is preferably 50% or less of the thickness Tc, more preferably The pants-type wearing article according to any one of <1> to <6>, which is 30% or less.
<8>
The side seal portion according to any one of <1> to <7>, wherein a portion of the side seal portion that is outward from the inner end portion is more likely to break than an inner portion of the inner end portion. Pants-type wearing article.
<9>
The pants-type wearing article according to any one of <1> to <8>, wherein the distance Dw or the distance Dc of the fused portion 40 is preferably 2.0 mm or less, more preferably less than 1.0 mm.
<10>
Each of the distance Dw and the distance Dc of the fused part 40 is preferably 2.0 mm or less, more preferably less than 1.0 mm, according to any one of <1> to <9>. Pants-type wearing article.
<11>
The underpants-type wearing article according to any one of <1> to <10>, wherein the distance Dw is 0.05 mm or more.
<12>
The thicknesses of the front body and the back body are <1> to <11>, wherein the thickness of the outer part from the inner end is smaller than the thickness of the inner part from the inner end in the inner and outer directions. The underpants type wearing article of any one.
<13>
The pants type according to any one of <1> to <12>, wherein the seal edge does not have a portion where the constituent fiber of the exterior body leaves a fiber shape outside the fused portion in the inner / outer direction P. Wearing articles.
<14>
The pants-type wearing article according to any one of <1> to <13>, wherein the pants-type wearing article is a pants-type disposable diaper.

  EXAMPLES Hereinafter, the present invention will be described more specifically with reference to examples, but the present invention is not limited to such examples.

[Example 1]
According to the manufacturing method shown in FIG. 5, a pants-type disposable diaper having the same basic configuration as the diaper 1 shown in FIGS. As an absorbent main body, an absorbent main body of a commercially available pants-type disposable diaper (trade name “Merry's Pants”, manufactured by Kao) is used, and an outer layer sea 31 and an inner layer sheet 32 constituting an exterior body are each a single fiber of PP. A spunbonded nonwoven fabric having a basis weight of 17 g / m 2 was used. In the manufacture of the diaper of Example 1, laser light is used as a fusing means for a diaper continuous body (exterior body continuous laminate), and the portion where the side seal portion is to be formed in the diaper continuous body is irradiated with laser light to melt it. Thus, a side seal portion was formed. The laser beam irradiation was performed using an apparatus having the same configuration as the laser type bonding apparatus shown in FIG. As the laser light, a CO2 laser was used, the laser output was 24 W, and the scanning speed was 280 m / s.

[Example 2]
In Example 1, a pants-type disposable diaper was produced in the same manner as in Example 1 except that the laser scanning speed was 160 m / s.

[Comparative Example 1]
In diaper manufacturing, instead of fusing using laser light, heat sealing using heating and pressurizing means (heat roll device) and physical cutting by cutting means of the heat seal part (pressurized part) are adopted. A pants-type disposable diaper was produced in the same manner as in Example 1 except that the side seal portion was formed by these means.
[Comparative Example 2]
In Comparative Example 1, a pants-type disposable diaper was produced in the same manner as in Comparative Example 1, except that the width of the fused part formed by the heating and pressing means (heat roll device) was changed.

[Evaluation]
About each diaper of an Example and a comparative example, the incidence rate of the lateral tear of a side seal part was evaluated by the following method, respectively. The results are shown in Table 1 below.

[Occurrence rate of side tear of side seal part]
Grasping the ventral region and the dorsal region of the waist region of the diaper, and when tearing from the waist toward the leg, those that could not be torn at one time were classified as “lateral tears” and tabulated. About each diaper of an Example and a comparative example, measurement was performed 40 times and the incidence rate of the "lateral tear" was expressed in percentage.

  As can be seen from Table 1, in the diaper of the example, the incidence of lateral tearing of the side seal portion was as low as 5% or less. On the other hand, in Comparative Examples 1 and 2, the occurrence rates of lateral tear were 50% and 20%, and the lateral tear occurred at a relatively high rate. From these results, it can be seen that according to the diaper of the embodiment, lateral tearing of the side seal portion can be effectively prevented.

1 Pants-type disposable diaper (pants-type wearing article)
DESCRIPTION OF SYMBOLS 1A Abdominal side part 1B Back side part F Front body R Rear body 2 Absorbent main body 3 Exterior body 31 Outer layer sheet 32 Inner layer sheet Ta Thickness of front body side exterior body Tb Thickness of rear body side exterior body
Edge of exterior body in A1 front body
Edge part 4 of exterior body in B1 back body Side seal part 40 Fusing part 40a Outer edge of fusing part 41 Sealing edge part Dw Inner and outer direction between both end parts and inner end part in thickness direction of fusing part A distance along the inner and outer directions between the inner end of the fusion part and the opposing part at the outer edge of the fusion part. 10 Diaper continuum (band-shaped exterior body)
20 Laser type bonding device 21 Support member 26 Belt type pressure device 27 Opening portion (light passage portion)

Claims (5)

An exterior body that forms the outer surface of the wearing article is provided, and a pair of side seal portions, a waist opening portion, and a pair of leg openings are formed by joining both side edges of the exterior body in the front body and both side edges of the exterior body in the back body A pants-type wearing article in which a part is formed,
The side seal portion is formed from a seal edge portion in which the edge portion of the exterior body in the front body and the edge portion of the exterior body in the back body are joined by a continuous linear fusion portion extending in the longitudinal direction of the side seal portion. Become
In the cross-section orthogonal to the direction in which the side seal portion extends, the fusion part is defined as a direction from the side closer to the wearer's skin of the wearing article to a side far from the inner and outer direction P, and a direction orthogonal to the inner and outer direction P. When the thickness direction Q is used, the distance Dw along the inner / outer direction P between the both end portions in the thickness direction Q and the inner end portion closest to the wearer's skin between the both end portions is the inner end portion. between the opposing part of the outer edge parts and said fusing unit state, and are a distance Dc or along the inner and outer direction P, in a cross section and perpendicular to the side sealing portions extending direction, said outer edge of said fused portion A pants-type wearing article having a shape that is recessed inward in the inner and outer directions .   The pants-type wearing article according to claim 1, wherein the distance Dw is larger than the distance Dc. The pants-type wearing article according to claim 1 or 2 , wherein the distance Dw is equal to or greater than a thickness Tc of the fusion part at a central position that bisects the distance Dw. The underpants according to any one of claims 1 to 3 , wherein the side seal portion is more easily ruptured in the inner / outer direction from the inner end than the inner end. Mold wearing article. 5. The thickness of the front body and the back body is any one of claims 1 to 4 , wherein the thickness of the outer portion from the inner end is smaller than the thickness of the inner portion from the inner end in the inner and outer directions. The pants-type wearing article according to item 1.