WO2015064606A1

WO2015064606A1 - Disposable diaper

Info

Publication number: WO2015064606A1
Application number: PCT/JP2014/078702
Authority: WO
Inventors: 知大中澤; 伸二浜本; 康至今井; 尚大平
Original assignee: 花王株式会社
Priority date: 2013-11-01
Filing date: 2014-10-29
Publication date: 2015-05-07
Also published as: CN105682629A; CN105682629B; JP2015085091A; JP5822278B2

Abstract

One embodiment of this disposable diaper (1) is provided with an outer cladding (3) forming the outer surface thereof, and both side edges (A1, A1) of the outer cladding (3) at the body front area (F) are joined to both side edges (B1, B1) of the outer cladding (3) at the body rear area (R), thus forming a pair of side seals (4, 4), a waist opening (8), and a pair of leg openings (9, 9). The side seals (4) are formed by the side edges (A1) of the outer cladding (3) at the body front area (F) and the side edges (B1) at the outer cladding (3) at the body rear area (R) being joined at a fusion section (seal edge) (40) having the form of a continuous line extending the vertical direction (X). The side seals (4) at a partial region of the region extending from the waist opening (8) to the leg openings (9) are formed in a bumpy shape such that in a front view of the diaper (1), convexities outward in the widthwise direction and concavities inward in the widthwise direction are arranged in alteration are arranged in alternation in the vertical direction.

Description

Disposable diapers

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 (for example, Patent Documents 1 and 2).

Japanese Patent Laid-Open No. 11-140706 JP 2012-070917 A

In the side seal part of the pants-type disposable diaper described in Patent Document 1, the side edge part of the ventral side part and the side edge part of the back side part of the exterior body are located inside the side edges of both side edge parts of the exterior body. Diagonally joined portions formed by joining are intermittently arranged. Therefore, the side edge of the side seal part is formed in a straight line like the side edge of the side edge part of the exterior body, the visibility is inferior, and it is easy to irritate the wearer's skin. .

Further, the side seal part of the pant-type disposable diaper described in Patent Document 2 is located on the inner side of the side edges of both side edges of the exterior body, and on the side edges and back sides of the exterior body. A wavy continuous joint is formed by joining the edges. Therefore, the side seal part of the diaper described in Patent Document 2 is the same as the side seal part of the diaper described in Patent Document 1, and the side edge of the side seal part is the same as the side edge of the side edge part of the exterior body. It is formed in a straight line, has poor visibility and is easy to irritate the wearer's skin.

Therefore, an object of the present invention is to provide a pants-type wearing article that can eliminate the above-mentioned drawbacks of the prior art.

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 The present invention relates to a pants-type wearing article in which a pair of leg openings are formed. Each of the pair of side seal portions is a continuous linear fusion portion in which a side edge portion of the exterior body in the front body and a side edge portion of the exterior body in the back body extend in the longitudinal direction of the side seal portion. The side seal portion in the region extending from the waist opening portion to the leg opening portion has a bonded seal edge portion, and the width direction outwardly when viewed from the front of the pant-type wearing article. Convex and concave irregularities are formed in the convex direction and inward in the width direction alternately in the vertical direction.

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 laser-type joining device. FIG. 7 is a diagram schematically showing a state in which a diaper continuous body (band-shaped sheet laminate) is introduced into the laser-type bonding apparatus shown in FIG. 6, and FIG. 7 (a) shows a part of the pressing member. FIG. 7B is a sectional view taken along the line II-II in FIG. 7A. FIGS. 8 (a) to 8 (c) show the side seal portion (fused portion) at the same time as the continuous diaper (strip-shaped exterior body) is cut using the laser-type bonding apparatus shown in FIG. It is explanatory drawing explaining a mode that it forms. FIGS. 9A to 9B are diagrams showing the behavior of the seal strength when the side seal portion is torn in the vertical direction. FIG. 10: is a top view which shows typically a part of side seal part of the underpants type disposable diaper which is other embodiment of the underpants type wearing article of this invention.

Detailed Description of the Invention

Hereinafter, the present invention will be described based on preferred embodiments with reference to the drawings. A pants-type disposable diaper 1 which is an embodiment of a 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 orthogonal to the wearer's front-rear direction in a plan view in an unfolded and extended state 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 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. 3, 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 the central portion of the outer package 3 by a known joining means (adhesive or the like) such that the longitudinal direction X thereof coincides with the longitudinal direction X of the diaper 1 in the expanded 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. Examples of the outer package 3 (outer layer sheet 31, inner layer sheet 32) include a heat-fusible synthetic resin such as polyethylene, polyethylene terephthalate, and polypropylene as a resin material, and non-woven fabric, film, laminate sheet of non-woven fabric and film, and the like. The thing which consists of is mentioned. 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 portions

4, 4 in the diaper 1 includes a side edge portion A 1 of the exterior body 3 in the front body F and a side edge portion B 1 of the exterior body 3 in the back body R, respectively. A seal edge portion is formed by joining at a continuous linear fusion portion 40 extending in the longitudinal direction X of the seal portion 4. The side seal portion 4 is formed over the entire region from the waist opening 8 to the leg opening 9. The fused part (seal edge part) 40 of the side seal part 4 is a state in which the side edge parts A1 and B1 of a plurality of sheets (the outer layer sheet 31 and the inner layer sheet 32) constituting the exterior body 3 are overlapped. The constituent resin of the sheet is formed by melting and solidifying.

In the diaper 1, as shown in FIG. 1, the side seal part 4 has no non-joining part outside the fusion part (seal edge part) 40 in the width direction Y. That is, the shape of the fused portion (seal edge) 40 is the shape of the outer edge of the side seal portion 4 outside the width direction Y as it is.

In the present invention, the side seal portion 4 in at least a part of the region extending from the waist opening 8 to the leg opening 9 is convex outward in the width direction when the pant-type wearing article (diaper 1) is viewed from the front. The concave and convex portions are formed in a concave and convex shape alternately in the width direction inwardly in the width direction. In the diaper 1 of the present embodiment, as shown in FIG. The side seal portion 4 in the entire region is formed in an uneven shape. Specifically, the side seal portion 4 of the diaper 1 is formed in a continuous wave shape over the entire region from the waist opening 8 to the leg opening 9 with the convex and concave adjacent to each other in the longitudinal direction X smoothly connected. ing.

From the viewpoint of improving visibility, the pants-type wearing article (diaper 1) is viewed from the front as shown in FIG. 1 and has a convex shape outward in the width direction over the entire area from the waist opening 8 to the leg opening 9. It is preferable that 1 or more and 401 or less are formed, and it is more preferable that 5 or more and 101 or less are formed.

Moreover, when the underwear-type wearing article (diaper 1) is viewed from the front as shown in FIG. 1, the longitudinal direction of the convex shape outward in the width direction in the entire region (AT) from the waist opening 8 to the leg opening 9 The ratio (L × 100 / AT) of the length (L) of X (in other words, the interval between the bottom points of the concave shapes adjacent to one convex shape) is set to 0. It is preferably 1% or more and 50% or less, and more preferably 0.5% or more and 10% or less. Further, the length (L) in the vertical direction X of the convex shape may not be equal to the vertical length of the concave shape.

Further, when the pant-type wearing article (diaper 1) is viewed from the front as shown in FIG. 1, the height (h) of the convex shape outward in the width direction (the apex of the convex shape and the convex shape are adjacent to each other). The distance from the bottom of the concave shape, that is, the height of the amplitude of the convex shape and the concave shape) is 1 mm from the viewpoint of ensuring the freedom of design and obtaining an R shape that does not irritate the skin. The thickness is preferably 20 mm or less and more preferably 2 mm or more and 5 mm or less.

As shown in FIG. 4, the fused portion (seal edge) 40 in the side seal portion 4 is close to the skin of the wearer of the wearing article in a cross section orthogonal to the direction in which the side seal portion 4 extends (longitudinal direction X). When the length in the inner and outer direction P toward the side farther from the side is the width W, and the length in the direction Q perpendicular to the direction P at the central position of the width W is the thickness T, the fusion part (seal edge) ) The thickness T of 40 is the same as or smaller than the total thickness (Ta + Tb) of the outer body 3 on the front body 1A side and the outer body 3 on the rear body 1B side, and the thickness T of the fusion part (seal edge) 40 The thickness T is larger than the thickness (Ta or Tb) of at least one of the outer body 3 on the front body 1A side and the outer body 3 on the rear body 1B side.

As shown in FIG. 4, in the cross section orthogonal to the direction (longitudinal direction X) in which the side seal portion 4 extends, the outer edge 4 a of the seal edge portion 40 is formed with a fusion portion between sheets constituting the exterior body 3. The fusion part 40 is wider at the center part in the thickness direction Q of the exterior body 3 than both end parts on the front body 1A side and the back body 1B side. By being formed in this way, the diaper 1 is difficult to irritate the wearer's skin.

More specifically, in the diaper 1, as shown in FIG. 4, the outer edge 4 a of the seal edge 40 is within the P direction of the diaper 1 in a cross section orthogonal to the direction (longitudinal direction X) in which the side seal portion 4 extends. A fusion arc of the sheets constituting the outer package 3 is formed on the inner side of the diaper 1 including the outer edge 4a and more on the inner side of the diaper 1 than the outer rim 4a. 3 is wider than both ends of the front body 1A side and the back body 1B side. By being formed in this way, the diaper 1 is difficult to irritate the wearer's skin.

The thickness Ta of the outer body 3 on the front body 1A side and the thickness Tb of the outer body 3 on the rear body 1B side are both thicknesses in portions other than the side seal portion 4, and preferably the front body 1A and the back body 1B. For each of these, the thickness is measured when the distance Lt is within a range of 1 to 11 mm from the fused portion (seal edge) 40 in the diaper lateral direction Y (see FIG. 2).
The thickness Ta and the thickness Tb were measured by applying a load of 0.5 cN / cm ² with a sample cut out from each of the outer body on the front body 1A side and the outer body on the back body 1B side between flat plates. The distance between the flat plates in the state is measured, and the value is taken as the thickness. The sample is cut into a 10 mm × 10 mm square, and if the dimensions cannot be cut, cut them to the closest possible dimensions.
On the other hand, the width W and the thickness T of the fused part are measured by observing a cross section under a state where no load is applied with a microscope (VHX-1000 manufactured by KEYENCE Corp.) at a magnification of 50 to 200 times.
The thickness Ta, the thickness Tb, and the width and thickness of the fused part are measured for three different cross sections in the direction along the side seal part 4, and the average value of the measured values is used as each value. .
The dimension of each part is preferably measured to a unit of 0.01 mm.

The thickness T of the fused portion (seal edge) 40 is firmly fused by applying a predetermined pressure, and the total thickness (Ta + Tb) of the outer body 3 on the front body 1A side and the body 3 on the rear body 1B side. Is the same as or smaller than
Moreover, since the thickness T of the fused part (seal edge part) 40 is made larger than at least one of the thickness Ta and the thickness Tb, it is not melted and hardened excessively. Here, “feel good” means that the wearer feels good.

In particular, if the thickness T of the fused part (seal edge) 40 is larger than each of the thickness Ta and the thickness Tb, the melted part (seal edge) 40 becomes soft because it does not melt excessively. Since the appearance and the touch are further improved, it is more preferable.

Further, the thickness T of the fused part (seal edge) 40 is a ratio (%) to the total thickness (Ta + Tb) of the outer body on the front body 1A side and the back body 1B side in terms of the fusion strength of the side seal part. Therefore, it is preferably 100% or less, more preferably 95% or less, and from the viewpoint of appearance and touch, preferably 30% or more, more preferably 50% or more, and appearance, touch, and side seal part. From the viewpoint of the fusion strength, it is preferably 30 to 100%, more preferably 50 to 95%.

Further, the thickness T of the fused part (seal edge) 40 is different from the total thickness (Ta + Tb) of the outer body of the front body 1A side and the back body 1B side (Ta + Tb-T). From the viewpoint of strength, it is preferably 0 mm or more, more preferably 0.02 mm or more, and from the viewpoint of the touch, preferably 0.25 mm or less, more preferably 0.2 mm or less. From the viewpoint of fusion strength and touch, it is preferably 0 to 0.25 mm, more preferably 0.02 to 0.2 mm.

Further, the ratio (%) of the thickness T of the fused part (seal edge) 40 to the thickness Ta of the outer body on the front body 1A side and the thickness Tb of the outer body on the back body 1B side is from the viewpoint of the touch. 110% or more, more preferably 150% or more, and from the viewpoint of the fusion strength of the side seal portion, preferably 300% or less, more preferably 200% or less. From the viewpoint of fusion strength and touch, it is preferably 110 to 300%, more preferably 150 to 200%.

Further, the thickness T of the fused part (seal edge) 40 is different from the thickness Ta of the exterior body on the front body 1A side and the thickness Tb of the exterior body on the back body 1B side (T-Ta, T-Tb). ) Is preferably 0.05 mm or more, more preferably 0.1 mm or more from the viewpoint of touch, and preferably 2.0 mm or less, more preferably 1. from the viewpoint of the fusion strength of the side seal portion. The thickness is preferably 0 mm or less, and preferably 0.05 to 2.0 mm, and more preferably 0.1 to 1.0 mm, from the viewpoint of the fusion strength and the touch of the side seal portion.

Moreover, since the width W of the fused part (seal edge part) 40 is smaller than the thickness T of the fused part (seal edge part) 40, an advantageous effect that the touch is further improved is achieved. preferable. From the same viewpoint, the width W of the fused portion (seal edge) 40 is preferably 95% or less, more preferably 50% or less, and preferably 10% or more, more preferably, of the thickness T. Is 30% or more, preferably 10 to 95%, more preferably 30 to 70%.

The width W of the fused part (seal edge part) 40 is preferably smaller from the viewpoint of improving the flexibility and feel of the side seal part, for example, preferably 2.0 mm or less, more preferably less than 1.0 mm. More preferably, it is less than 0.3 mm. On the other hand, it is preferable that it is 0.1 mm or more from the point of ensuring the sealing strength.
Further, as described above, the thickness T of the fused part (seal edge) 40 is preferably larger than the width W of the fused part (seal edge) 40, for example, the fused part (seal edge) 40. When the width W is less than 0.3 mm, the thickness T of the fused part (seal edge part) 40 is preferably 0.3 mm or more.

Realizing such a size relationship of each part, in particular, the thickness T of the fusion part (seal edge) 40, the thickness Ta of the outer body on the front body 1A side, or the thickness of the outer body on the back body 1B side. Making it larger than Tb is usually not achieved by the method for forming the side seal portion using a pressure heating means such as a heat roll device. That is, the side seal part (fused part) formed in accordance with a conventional method using a pressure heating means is to heat the exterior body constituting the side seal part while compressing it in the thickness direction. Therefore, the thickness of the fusion part is usually smaller than the thickness of the exterior body on the front body 1A side or the back body 1B side. In order to set the thickness T of the fused portion (seal edge) 40 to the thickness Ta and / or Tb of the exterior body as in the present embodiment, the exterior body 3 is arranged in the thickness direction in the step of forming the side seal portion 4. It is important to form the side seal portion 4 while suppressing the degree of compression. As a method for forming the side seal portion 4 while suppressing the compression of the outer package 3, fusing using a laser beam can be mentioned. That is, a method of forming the side seal portion 4 by using a laser beam as a fusing means of the outer package 3 and irradiating the laser beam to a portion where the side seal portion 4 is to be formed in the outer package 3 to melt it. It is done.

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. And a side seal portion forming step of forming the side seal portion 4 by fusing the cut side 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 cut-out side edge portions of a plurality of laminated exterior bodies 3 (outer layer sheet 31 and inner layer sheet 32) produced by the above are fused, and the exterior body 3 having a pair of

side seal portions

4 and 4 is provided. The pants-type 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-shaped inner layer sheets 32 to be formed, the waist elastic member 5 that forms the waist gather, the waist elastic member 6 that forms the waist gather, and the leg elastic member 7 that forms 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. It should be noted that the elastic members such as the waist elastic member 5 and the waistline elastic member 6 are divided by the laser light irradiation in the sheets 31 and 32 (parts where the side seal portion 4 is to be formed, FIGS. 7 and 8). In order to avoid inconveniences such as significant shrinkage of the elastic member after the division and disconnection of the elastic member, the portion is arranged in a stretched state so as to straddle the portion scheduled to be divided indicated by the middle reference numeral 10C) It is preferable to apply an adhesive in the vicinity thereof. 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.
Moreover, in the formation process of this exterior body 3, the some junction part (not shown) which joins the strip | belt-shaped outer-layer sheet 31 and the strip | belt-shaped inner-layer sheet | seat 32 between the adjacent two waist part

elastic members

6 and 6 is carried out. Further, it is formed using a joining means such as a convex roll 12 and an anvil roll 13 corresponding thereto.
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 (not shown), and the absorbent main body 2 is rotated by 90 degrees. Then, it is intermittently supplied and fixed on the inner layer sheet 32 constituting the belt-shaped outer package 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 strip-shaped exterior body 3 is folded in the width direction (a direction perpendicular to the conveying direction of the exterior body 3). More specifically, as shown in FIG. 5, both

side portions

3 a and 3 a along the conveying direction of the strip-shaped outer package 3 are folded back so as to cover both ends in the longitudinal direction X of the absorbent main body 2. After fixing both ends in the longitudinal direction X, 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 device 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 includes a tension adjusting mechanism (not shown) that can adjust the tension of the pressure belt 24 wound around the outer peripheral surface of the annular support member 21 (the peripheral surface portion of the cylindrical roll 23). With this adjustment, the pressure applied to the diaper continuous body 10 (sheet laminate) can be appropriately adjusted by the support member 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. As shown in FIG. 7, the slit-shaped opening 27 has a shape corresponding to the shape of the outer edge of the side seal portion 4 to be formed (the shape of the fused portion 40) in plan view of the peripheral surface of the cylindrical roll 23. Is formed. That is, the opening 27 is formed in a continuous wave shape with a certain interval between the pair of

frames

22 and 22. The opening 27 has a longitudinal direction that intersects the conveyance direction A of the diaper continuous body 10 (band-shaped exterior body 3), more specifically, a direction parallel to the axial length direction of the rotation axis of the cylindrical roll 23. A plurality of cylindrical support members 21 are formed at predetermined intervals in the circumferential direction. 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 by a plurality of curved members instead of a single annular member, and the plurality of members are interposed between the pair of

frame bodies

22 and 22. And a method of arranging the frame body 22 at a predetermined interval in the circumferential direction.

Further, as shown in FIG. 7, the support member 21 has a recess 28 on its outer surface (contact surface with the workpiece). A plurality of recesses 28 are formed at predetermined intervals in the circumferential direction of the cylindrical support member 21, and a slit-shaped opening 27 is formed in a region (convex part) located between two

adjacent recesses

28, 28. Is formed. The opening 27 is formed in the center in the circumferential direction of the cylindrical support member 21 in the convex portion.

Thus, when the thickness of the diaper continuous body 10 (band-shaped sheet laminated body) is not uniform by forming the recess 28 on the outer surface of the support member 21, the relative thickness of the diaper continuous body 10 is relatively small. It is possible to introduce the diaper continuous body 10 onto the outer surface of the support member 21 so that a large portion (for example, an arrangement region of the absorbent main body 2) is accommodated in the recess 28. Then, when the diaper continuous body 10 is introduced onto the support member 21 in this manner, as shown in FIG. 7B, the contact surface (the other surface) of the diaper continuous body 10 with the pressure belt 24 (pressing member). 10b) is substantially flat. Therefore, when the pressure belt 24 is pressed against the diaper continuous body 10, the portion of the diaper continuous body 10 located on the convex portion where the opening 27 is formed (reference numeral in FIG. 7). The entire portion to be divided and its vicinity shown by 10C is uniformly pressed in the thickness direction at a predetermined pressure by wrapping the diaper continuous body 10 around the support member 21 with a predetermined tension and the pressure belt 24. Thus, when the portion that has been pressed in the thickness direction from before being divided by the irradiation of the laser beam 30 is irradiated with the laser beam 30 to divide the portion, the divided portion is configured. Do It becomes possible to more reliably fused to one other cutting edge of several sheets, further improvement in fusion strength of the side seal portion 4 (fused portion 40) is achieved.

As shown in FIG. 6, the belt-type pressure device 26 includes an endless pressure belt 24 (pressing member) and three

rolls

25a, 25b, and 25c that rotate while the pressure belt 24 is bridged. It has. The

rolls

25a, 25b, and 25c may be drive rolls or driven rolls that rotate with the pressure belt 24. The pressure belt 24 moves at the same speed as the cylindrical roll 23 (supporting member 21) by using any one or more of the

rolls

25a, 25b, and 25c as a driving roll or rotating 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 a constituent material of the support member 21, a material having high thermal conductivity is specifically used from the viewpoint of forcibly cooling the cut edge portion of the diaper continuous body 10 (band-shaped sheet laminate) and promoting the formation of the fused portion. Specifically, metal materials such as iron, aluminum, stainless steel, and copper, and ceramics can be used. Further, as a constituent material of 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, iron, aluminum, stainless steel, or the like. What consists of metal materials 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 (an apparatus having a motor shaft with a mirror) 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, and the laser beam 30. A mechanism for moving the position (irradiation point) at which the diaper continuum 10 hits the support member 21 in the circumferential direction of the cylindrical roll 23, a mechanism for making the spot diameter of the laser beam 30 constant on the circumferential surface of the cylindrical roll 23, and the like. I have. 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.

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 side 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 wearing 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 along the continuous wave shape of the opening 27 through the opening 27 from the support member 21 side, the diaper continuous body 10 is divided at the same time. The cut edges of the plurality of sheets (exterior body 3) in the pressurized state are fused together to form the side seal portion 4 (side seal portion forming step).

FIG. 8 is a diagram illustrating a state in which the side seal part 4 (fused part 40) is formed at the same time as the diaper continuous body 10 (strip-shaped sheet laminate) is divided using the laser bonding apparatus 20. FIG. 8A schematically shows a portion 10 C (a portion 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. 8A, 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, 3a of the strip-shaped outer package 3 cover both ends in the longitudinal direction X of the absorbent main body 2 when the diaper continuous body 10 is manufactured. (Refer to FIG. 5) Due to the fact that there are two exterior bodies 3 on each of the abdominal part 1A and the back side part 1B, and a total of these four

exterior bodies

3 and 3 are laminated, as a result Eight

sheets

31 and 32 are laminated. In each of the 4-layer structure portion and the 8-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. In FIG. 8, the illustration of the elastic member is omitted from the viewpoint of easy explanation. 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 embodiment of FIG. 8, all of the four

sheets

31 and 32 that constitute the scheduled division portion 10 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. 8 (b), the diaper continuous body 10 has one surface 10 a in contact with the support member 21, and a portion 10 C (a portion where the side seal portion 4 is to be formed) 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 along the continuous wave shape of the opening part 27 from the support member 21 side through the opening part 27 with respect to 10 C of parts to be divided in the state of conveyance and a 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 to scan following 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 C is indirectly heated by the laser beam 30 and melted. As a result, as shown in FIG.8 (c), the parting plan part 10C of a four-layer structure is melted, and in a form in which a single sheet stack (diaper precursor) is cut from the diaper continuous body 10, At the same time that the diaper continuous body 10 is divided, the cut side edges of the four

sheets

31 and 32 in the sheet laminate of the single sheets generated by the division and the separated diaper continuous body 10 are separated. The cut edge portions of the four

sheets

31 and 32 are fused together. These cut side edges are respectively 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 the irradiation of the laser beam 30). State). 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 cut side edges at the same time, the fusion and splitting can be performed with approximately half the laser output compared to the method of fusing the two fusion spots with two laser irradiations. It can be carried out in the same process, and the diaper 1 can be manufactured efficiently.

The cut side 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. The sheet diaper precursor and the diaper continuum 10 are maintained in a pressurized state by the support member 21 and the pressure belt 24, and are quickly cooled and solidified by the outside air after the irradiation is completed. It becomes the fusion | melting part (seal edge part) 40 in which the formation material (fiber etc.) of the cutting | disconnection side edge part was fuse | melted and integrated. Thus, by forming the wave-like fusion part (seal edge part) 40, one of the pair of

side seal parts

4 and 4 in one diaper 1 is formed. If necessary, the cutting edge of the

sheets

31 and 32 is forcibly cooled by using a known cooling means such as a suction device or an exhaust device, and the formation of the fused portion (seal edge) 40 is promoted. May be.

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 wavy side seal part 4 (fused part 40) is paired with the wave-like side seal part 4 previously formed. It is formed. Thereafter, by repeating the same operation, the pants-type disposable diaper 1 including the exterior body 3 having the pair of corrugated

side seal portions

4 and 4 is continuously manufactured.

In the diaper 1 manufactured in this way, the side seal portion 4 includes the side edge portion A1 of the exterior body 3 in the front body F and the side edge portion B1 of the exterior body 3 in the rear body R in the longitudinal direction of the side seal portion 4. It is formed by being joined by a continuous wave fusion part (seal edge part) 40 extending to X. Further, the side seal portion 4 in at least a part of the region extending from the waist opening 8 to the leg opening 9 is convex and concave in the width direction outward and concave in the width direction when the diaper 1 is viewed from the front. Are formed in a concavo-convex shape alternately arranged in the vertical direction. Therefore, the visibility of the side seal part 4 is improved, and the uneven shape makes it difficult to irritate the wearer's skin.

Moreover, in the diaper 1, as shown in FIG. 1, the side seal part 4 in the whole area | region ranging from the waist opening part 8 to the leg opening part 9 is formed in uneven | corrugated shape. In other words, the side seal portion 4 of the diaper 1 is formed in a continuous wave shape over the entire region from the waist opening 8 to the leg opening 9 with the convex and concave adjacent to each other in the longitudinal direction X smoothly connected. . Therefore, the visibility of the side seal part 4 is further improved, and the wave shape does not further irritate the wearer's skin. In addition, when the side seal part 4 is broken after use and the diaper 1 is taken off, the side seal part 4 is not separated from the side seal part 4 and does not tear laterally. It can be recognized sensuously that it is torn.

Further, in the diaper 1, the thickness T of the fused part (seal edge) 40 is equal to or smaller than the total thickness (Ta + Tb) of the exterior body, and the thickness Ta of the exterior body on the front body side or the back body side The side seal portion 4 larger than the thickness Tb of the outer casing can be easily obtained by appropriately adjusting the degree of pressurization when irradiating the laser beam, the output of the laser beam, and the spot diameter.
Moreover, the outer edge 4a which consists of a melt | fusion part (seal edge part) 40 in the cross section orthogonal to the direction where the side seal part 4 is extended at the time of wear is the inner part of a wear article. It has a concave shape.
Further, as shown in FIG. 4, the side seal part 4 does not have a part where the constituent fibers of the exterior body 3 leave the fiber shape outside the fusion part (seal edge part) 40 in the inner / outer direction P. Therefore, the appearance is good and the touch is improved.

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.

Further, the uneven side seal portion 4 in which unevenness is alternately arranged in the vertical direction is easy to tear when it is torn after use. Whether or not it is easy to tear can be determined by measuring the behavior when tearing the side seal portion by the following measuring method.

[Measurement method of behavior when tearing side seal part]
A cut sample is cut out by cutting into a rectangular shape of 74 mm in the vertical direction and 37 mm in the horizontal direction with the side seal portion as the center in the horizontal direction. Next, a cut is made along the side seal portion from the longitudinal upper end of the cut sample, and a test piece is prepared so that the length of the side seal portion is 50 mm. Next, using a tensile tester (for example, “AG-X CL11 / 1000” manufactured by Shimadzu Corporation), the distance between the upper and lower chucks is adjusted to 20 mm (interval that allows the test piece to be inserted). . Then, one upper end separated by a break in the test piece is sandwiched on the upper side of the chuck, the other upper end separated by a break in the test piece is sandwiched on the lower side of the chuck, and the upper chuck is raised at a constant speed of 300 mm / min. The behavior of the seal strength when the side seal portion having a length of 50 mm is torn in the longitudinal direction is measured.

FIG. 9 (a) shows the behavior of the seal strength when the side seal portion 4 of the diaper 1 is torn in the vertical direction, and FIG. 9 (b) shows a straight side seal portion in the vertical direction. The behavior of the seal | sticker strength at the time of tearing the linear side seal part of the comparative example of a comparative example provided and the linear side seal part of a comparative example to a vertical direction is shown. The behavior when tearing the uneven side seal portion 4 of the diaper 1 shown in FIG. 9A is compared with the behavior when tearing the straight side seal portion of the diaper of the comparative example shown in FIG. 9B. It can be seen that periodically, a behavior in which the seal strength becomes very low is seen, and that it is easy to tear in the longitudinal direction after use.

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 outer package is a wavelength that is absorbed by the sheet and generates heat for the individual sheets constituting the outer package depends on the material of the sheet and the wavelength of the laser beam 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 a wavelength of 9.0 μm or more and 11.0 μm or less of the oscillation wavelength 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, in the diaper 1, as shown in FIG. 1, the side seal portion 4 in the entire region extending from the waist opening 8 to the leg opening 9 is formed in an uneven shape, but a part on the waist opening 8 side. The side seal part 4 in a part of the leg opening 9 or a part of the area between the waist opening 8 and the leg opening 9 may be formed in an uneven shape.

Moreover, in the diaper 1, as shown in FIG. 1, although the uneven | corrugated shape of the side seal part 4 is formed in the wave form which the convex and concave adjacent to the vertical direction X were connected smoothly, it shows in FIG. In this way, the protrusion may be formed in a jagged shape in which a protrusion extending in a triangular shape outward in the width direction Y and a recess recessed in a triangular shape inward in the width direction Y are connected.

In addition, the belt-shaped outer package (sheet laminate) is a stack of four sheets as shown in FIG. 8 (a), or two, three, or five or more sheets. May be.
In addition, as shown in FIG. 3, the exterior body 3 in the above embodiment is not divided into the ventral part 1A and the dorsal part 1B, but an hourglass extending over the ventral 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, for example, an abdominal sheet member disposed on the abdomen side (front side) of the wearer It is divided | segmented into the back | dorsal sheet | seat member distribute | arranged to a wearer's back | dorsal side (rear side), and an 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.

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.

The following additional notes (pants-type wearing articles) are further disclosed with respect to the embodiment of the present invention described above.

<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,
Each of the pair of side seal portions is a continuous linear fusion portion in which a side edge portion of the exterior body in the front body and a side edge portion of the exterior body in the back body extend in the longitudinal direction of the side seal portion. Having a bonded seal edge,
The side seal portion in at least a part of the region extending from the waist opening to the leg opening is convex outward in the width direction and concave inward in the width direction when the pants-type wearing article is viewed from the front. A pants-type wearing article formed in an uneven shape in which unevenness is alternately arranged in the vertical direction.

<2>
The side seal portion in the entire region extending from the waist opening to the leg opening has a convex shape outward in the width direction and a concave and convex shape in the width direction in the vertical direction when the pant-type wearing article is viewed from the front. The pants-type wearing article according to <1>, wherein the pants-type wearing article is formed in an uneven shape arranged alternately.
<3>
In the cross section perpendicular to the direction in which the side seal portion extends, the outer edge of the seal edge portion is formed with the fused portion of the sheets constituting the outer package, and the fused portion is the thickness of the outer package. The underpants-type wearing article according to <1> or <2>, wherein a central portion in the direction is wider than both end portions.
<4>
In a cross section orthogonal to the direction in which the side seal portion extends, the outer edge of the seal edge portion has a convex arc shape toward the inside of the wearing article, and includes the outer edge and is further inward of the wearing article. The fusion part between the sheets constituting the exterior body is formed, and the fusion part is wider in the central part in the thickness direction of the exterior body than both ends, <1> to <3> The underpants type wearing article of any one of 3.
<5>
The pants-type wearing article according to any one of <1> to <4>, wherein the side seal portion does not have a non-joining portion outward in the width direction from the fusion portion.
<6>
The pants-type wearing article according to any one of <1> to <5>, wherein the shape of the seal edge is the shape of the outer edge of the side seal portion in the width direction Y outside.
<7>
The exterior body is disposed on an outer layer sheet that forms an outer surface of the pants-type wearing article (non-skin contact surface of the outer body), and an inner surface side of the pants-type wearing article. <1> to <6>, including an inner layer sheet forming a skin contact surface of the body) and a plurality of thread-like or belt-like elastic members fixed between the two sheets with an adhesive. The underpants type wearing article of any one of these.
<8>
The pants-type wearing article according to any one of <1> to <7>, wherein the exterior body (the outer layer sheet, the inner layer sheet) includes a resin material and is formed using the resin material as a main component. .
<9>
The pants according to any one of <1> to <8>, wherein the exterior body (the outer layer sheet, the inner layer sheet) includes a heat-fusible synthetic resin such as polyethylene, polyethylene terephthalate, or polypropylene as a resin material. Mold wearing article.
<10>
The pants-type wearing article according to any one of <1> to <9>, wherein the outer package (the outer layer sheet, the inner layer sheet) is formed of a nonwoven fabric, a film, a laminate sheet of a nonwoven fabric and a film, or the like.

<11>
The side seal portion has a convex and a concave portion adjacent to each other in the longitudinal direction X corresponding to the wearer's front-rear direction in a developed and extended plan view, and smoothly extends from the waist opening to the leg opening. The pants-type wearing article according to any one of <1> to <10>, wherein the article is formed in a continuous wavy shape over the entire area.
<12>
When the pants-type wearing article is viewed from the front, the height (h) of the convex shape outward in the width direction (the distance between the apex of the convex shape and the bottom point of the concave shape adjacent to the convex shape, The height of the amplitude of the convex shape and the concave shape is 1 mm or more and 20 mm or less, preferably 2 mm or more and 5 mm or less. The pants-type wearing article according to any one of the above items <1> to <11>.
<13>
The pants-type wearing article according to any one of the above items <1> to <12>, wherein the uneven shape of the side seal portion is a wave shape in which a convex and a concave adjacent to each other in the vertical direction X are smoothly connected.
<14>
The uneven shape of the side seal part is formed in a jagged shape in which a convex extending in a triangular shape outward in the width direction Y and a concave recessed in a triangular shape in the width direction Y are connected. The article for wearing underpants according to any one of> to <12>.
<15>
The pant-type wearing article according to any one of <1> to <14>, wherein the pant-type wearing article includes an absorbent main body and the exterior body that forms an outer surface of the wearing article.
<16>
The above-mentioned pant-type wearing article is a pant-type sanitary napkin or a diaper cover that includes an exterior body that forms an outer surface of the wearing article but does not include an absorbent main body. 14> The underpants type wearing article of any one of 14.
<17>
The pants-type wearing article according to any one of the above items <1> to <16>, wherein the side seal portion has no non-bonded portion outward in the width direction from the fusion portion.
<18>
In the cross-section orthogonal to the direction in which the side seal portion extends, the fusion part has a width W in the inner and outer direction from the side closer to the wearer's skin of the pant-type wearing article, and the center of the width W. When the length in the direction perpendicular to the direction at the position is the thickness T,
The thickness T of the fusion part is equal to or smaller than the total thickness of the outer body on the front body side and the outer body on the rear body side, and the thickness T of the fusion part is the outer body on the front body side. The pants-type wearing article according to any one of <1> to <17>, wherein the article is larger than at least one thickness of the outer body on the back body side.

<19>
The pants-type wearing article according to any one of <1> to <18>, wherein the thickness T of the fusion part is larger than any thickness of the outer body on the front body side and the outer body on the rear body side.
<20>
The ratio of the thickness T of the fused portion to the thickness of the outer body on the front body side and the thickness of the outer body on the rear body side is 110 to 300%, preferably 150 to 200% <1> The pants-type wearing article according to any one of ~ <19>.
<21>
The thickness T of the fused part is 0.05 to 2.0 mm, preferably 0.1 to 1.mm, in difference between the thickness of the outer body on the front body side and the thickness of the outer body on the rear body side. The pants-type wearing article according to any one of the above items <1> to <20>, which is 0 mm.
<22>
The pants-type wearing article according to any one of <1> to <21>, wherein the width W of the fusion part is smaller than the thickness T of the fusion part.
<23>
The pants type according to any one of <1> to <22>, wherein the width W of the fusion part is 10 to 95%, preferably 30 to 70%, of the thickness T of the fusion part Wearing articles.
<24>
<1> to <23, wherein the width W of the fused portion is 2.0 mm or less, preferably less than 1.0 mm, more preferably less than 0.3 mm, and preferably 0.1 mm or more. > The underpants type wearing article of any one of>.
<25>
The pants-type wearing article according to any one of <1> to <24>, wherein the width W of the fusion part is 0.1 mm or more.
<26>
The pants-type wearing article according to any one of <1> to <25>, wherein the thickness T of the fusion part is 0.3 mm or more, and the width W of the fusion part is less than 0.3 mm. .

<27>
A polymerization pressurizing step for forming a side seal portion formation planned portion in a belt-shaped exterior body in a state where the front body side and the back body side are overlapped with each other, and a formation planned portion of the side seal portion in the pressurization state In addition, the exterior body is divided by irradiating a laser beam through a light passage portion extending in a direction crossing the conveyance direction A of the exterior body, and the exterior of the laminated state generated by the division A side seal part forming step of forming the side seal part by fusing the cut side edges of the body,
The side seal portion forming step irradiates a laser beam using a laser type bonding apparatus 20,
The laser-type joining device is directed to a hollow cylindrical roll that is rotationally driven in the transport direction (A direction) and a cylindrical support member that is disposed in a hollow portion of the cylindrical roll and forms a peripheral surface portion of the cylindrical roll. And an irradiation head for irradiating laser light, and a belt-type pressure device 26 including an endless pressure belt (pressing member),
The support member has a light passage part through which laser light can pass, and the light passage part is a slit-like opening that penetrates the support member in the thickness direction,
The slit-shaped opening is a method for manufacturing a pants-type wearing article in which the slit-shaped opening is formed in a continuous wave shape with a certain interval.
<28>
The manufacturing method of the underpants type wearing article as described in said <27> which comprises the main body fixing process which fixes an absorptive main body to the strip | belt-shaped said exterior body before the said superposition | polymerization pressurization process.
<29>
The cut side edge of the strip-shaped outer package is a single-wafer pant-type wearing article precursor cut from a continuous body of the pants-type wearing article by laser light irradiation, and the support of each of the pants-type wearing article While maintaining the pressurized state by the member and the pressure belt, it is cooled and solidified after the irradiation is completed, and the fused portion (seal) in which the forming material (fibers, etc.) of the cut side edge is fused and integrated The manufacturing method of the underpants type wearing article as described in said <27> or <28> used as an edge part.
<30>
The cylindrical support member has a recess on its outer surface, and a plurality of the recesses are formed at predetermined intervals in the circumferential direction of the cylindrical support member, and between the two adjacent recesses. The method for producing a pants-type wearing article according to any one of the above <27> to <29>, wherein the slit-shaped opening is formed in a region to be positioned.

According to the present invention, the visibility of the side seal portion is improved and it is difficult to irritate the wearer's skin.

Claims

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,
Each of the pair of side seal portions is a continuous linear fusion portion in which a side edge portion of the exterior body in the front body and a side edge portion of the exterior body in the back body extend in the longitudinal direction of the side seal portion. Having a bonded seal edge,
The side seal portion in at least a part of the region extending from the waist opening to the leg opening is convex outward in the width direction and concave inward in the width direction when the pants-type wearing article is viewed from the front. A pants-type wearing article formed in an uneven shape in which unevenness is alternately arranged in the vertical direction.
The side seal portion in the entire region extending from the waist opening to the leg opening has a convex shape outward in the width direction and a concave and convex shape in the width direction in the vertical direction when the pant-type wearing article is viewed from the front. The underpants-type wearing article according to claim 1, wherein the article is formed in an uneven shape arranged alternately.
In the cross section perpendicular to the direction in which the side seal portion extends, the outer edge of the seal edge portion is formed with the fused portion of the sheets constituting the outer package, and the fused portion is the thickness of the outer package. The underpants-type wearing article according to claim 1 or 2, wherein a central portion of the direction is wider than both end portions.
In a cross section orthogonal to the direction in which the side seal portion extends, the outer edge of the seal edge portion has a convex arc shape toward the inside of the wearing article, and includes the outer edge and is further inward of the wearing article. The fusion part of the sheets constituting the exterior body is formed, and the fusion part is wider at the center part in the thickness direction of the exterior body than both end parts. The pants-type wearing article according to any one of the above.
The pants-type wearing article according to any one of claims 1 to 4, wherein the side seal part has no non-joining part outward in the width direction from the fusion part.
The pants-type wearing article according to any one of claims 1 to 5, wherein a shape of the seal edge portion is directly a shape of an outer edge of the side seal portion in the width direction outer side.
The exterior body is disposed on an outer layer sheet that forms a non-skin contact surface of the exterior body of the pant-type wearing article, and on the inner surface side of the outer layer sheet, and the skin contact of the exterior body of the pant-type wearing article The pants according to any one of claims 1 to 6, comprising an inner layer sheet that forms a surface and a plurality of thread-like or belt-like elastic members fixed between the two sheets with an adhesive. Mold wearing article.
The pants-type wearing article according to any one of claims 1 to 7, wherein the exterior body includes a resin material and is formed using the resin material as a main component.
The pants-type wearing article according to any one of claims 1 to 8, wherein the exterior body includes a heat-sealable synthetic resin such as polyethylene, polyethylene terephthalate, or polypropylene as a resin material.
The pants-type wearing article according to any one of claims 1 to 9, wherein the exterior body is made of a nonwoven fabric, a film, a laminate sheet of a nonwoven fabric and a film, or the like.
The side seal portion is a whole area extending from the waist opening portion to the leg opening portion by smoothly connecting the convex and concave portions adjacent to each other in the longitudinal direction corresponding to the wearer's front-rear direction in a plan view in an unfolded and extended state. The pants-type wearing article according to any one of claims 1 to 10, wherein the article is formed in a continuous wave shape.
The pants-type wearing article according to any one of claims 1 to 11, wherein the height h of the shape convex outward in the width direction is 1 mm or more and 20 mm or less when the pants-type wearing article is viewed from the front.
The pants-type wearing article according to any one of claims 1 to 12, wherein the uneven shape of the side seal portion is a wave shape in which convexes and concaves adjacent in the vertical direction are smoothly connected.
The uneven shape of the side seal part is formed in a jagged shape in which a convex extending outward in the width direction is connected to a concave recessed in a triangular shape inward in the width direction. The underpants type wearing article of any one of these.
The pant-type wearing article according to any one of claims 1 to 14, wherein the pant-type wearing article includes an absorbent main body and the exterior body that forms an outer surface of the wearing article.
15. The pant-type wearing article is a pant-type sanitary napkin or a diaper cover that includes an exterior body that forms an outer surface of the wearing article but does not include an absorbent main body. The pants-type wearing article according to any one of the above.
The pants-type wearing article according to any one of claims 1 to 16, wherein the side seal part has no non-joining part outward in the width direction from the fusion part.
In the cross-section orthogonal to the direction in which the side seal portion extends, the fusion part has a width W in the inner and outer direction from the side closer to the wearer's skin of the pant-type wearing article, and the center of the width W. When the length in the direction perpendicular to the direction at the position is the thickness T,
The thickness T of the fusion part is equal to or smaller than the total thickness of the outer body on the front body side and the outer body on the rear body side, and the thickness T of the fusion part is the outer body on the front body side. The pants-type wearing article according to any one of claims 1 to 17, wherein the article is larger in thickness than at least one of the outer body on the back body side.
The pants-type wearing article according to any one of claims 1 to 18, wherein the thickness T of the fusion part is larger than any thickness of the front body side exterior body and the back body side exterior body.
The ratio of the thickness T of the fused part to the thickness of the outer body on the front body side and the thickness of the outer body on the rear body side is 110 to 300%. Pants-type wearing article as described.
21. The thickness T of the fusion part is 0.05 to 2.0 mm in difference between the thickness of the outer body on the front body side and the thickness of the outer body on the rear body side. The underpants type wearing article of Claim 1.
The pants-type wearing article according to any one of claims 1 to 21, wherein the width W of the fusion part is smaller than the thickness T of the fusion part.
The pants-type wearing article according to any one of claims 1 to 22, wherein the width W of the fusion part is 10 to 95% of the thickness T of the fusion part.
The pants-type wearing article according to any one of claims 1 to 23, wherein the width W of the fusion part is 2.0 mm or less.
The pants-type wearing article according to any one of claims 1 to 24, wherein the width W of the fusion part is 0.1 mm or more.
The pants-type wearing article according to any one of claims 1 to 25, wherein the thickness T of the fusion part is 0.3 mm or more.
A polymerization pressurizing step for forming a side seal portion formation planned portion in a belt-shaped exterior body in a state where the front body side and the back body side are overlapped with each other, and a formation planned portion of the side seal portion in the pressurization state In addition, the exterior body is divided by irradiating a laser beam through a light passage portion extending in a direction intersecting the conveying direction of the exterior body, and the exterior body in a laminated state generated by the division. A side seal portion forming step of forming the side seal portion by fusing the cut side edges of each other,
The side seal part forming step irradiates a laser beam using a laser type bonding apparatus,
The laser-type bonding apparatus includes a hollow cylindrical roll that is rotationally driven in a conveying direction, and a laser beam directed toward a cylindrical support member that is disposed in a hollow portion of the cylindrical roll and forms a peripheral surface portion of the cylindrical roll. An irradiation head for irradiating and a belt-type pressure device including an endless pressure belt;
The support member has a light passage part through which laser light can pass, and the light passage part is a slit-like opening that penetrates the support member in the thickness direction,
The slit-shaped opening is a method for manufacturing a pants-type wearing article in which the slit-shaped opening is formed in a continuous wave shape with a certain interval.
The method for manufacturing a pants-type wearing article according to claim 27, further comprising a main body fixing step of fixing the absorbent main body to the belt-shaped outer package before the polymerization pressure step.
The cut side edge of the strip-shaped outer package is a single-wafer pant-type wearing article precursor cut from a continuous body of the pants-type wearing article by laser light irradiation, and the support of each of the pants-type wearing article 28. While maintaining the pressurized state by the member and the pressure belt, the material is cooled and solidified after completion of irradiation, thereby forming a fused portion in which the forming material of the cut side edge portion is fused and integrated. Or the manufacturing method of the underpants type wearing article of 28.
The cylindrical support member has a recess on its outer surface, and a plurality of the recesses are formed at predetermined intervals in the circumferential direction of the cylindrical support member, and between the two adjacent recesses. The method for manufacturing a pants-type wearing article according to any one of claims 27 to 29, wherein the slit-shaped opening is formed in a region to be positioned.