WO2014208651A1

WO2014208651A1 - Underpants-type disposable nappy

Info

Publication number: WO2014208651A1
Application number: PCT/JP2014/066940
Authority: WO
Inventors: 佑馬中尾; 奥田　泰之; 京子石橋; 哲史内田; 鈴木　陽一; 康至今井
Original assignee: 花王株式会社
Priority date: 2013-06-28
Filing date: 2014-06-26
Publication date: 2014-12-31
Also published as: RU2016102161A3; RU2680225C2; CN105246442A; RU2016102161A; TW201511744A; TWI641362B; CN105246442B

Abstract

An underpants-type disposable nappy (1) is provided with: a crotch part (C); an abdominal-side part (A) and a back-side part (B); and a pair of side seal parts (S). The side seal parts (S) are formed such that: in a state prior to wearing of the nappy (1), in contrast to a state during wearing of the nappy (1), the side seal parts (S) extend linearly along a vertical direction (X) of the nappy (1); and, in the state during wearing, the side seal parts (S) extend in a meandering manner along the vertical direction (X) of the nappy (1). The side seal parts (S) are provided with joined parts extending along the vertical direction (X) of the nappy (1). It is preferable that unjoined parts are not present further outwards in a horizontal direction (Y) of the nappy (1) than the joined parts.

Description

Pants-type disposable diapers

The present invention relates to a pants-type disposable diaper.

Conventionally, as a pants-type disposable diaper, a crotch portion including an absorbent body, a ventral side portion and a dorsal side portion respectively extending from the crotch portion to a wearer's ventral side and a dorsal side, and on the front abdominal side A structure in which a pair of side seal parts, a waist opening part, and a pair of leg opening parts are formed by joining right and left side edges and left and right side edges at the back side part is widely used. In this type of pants-type disposable diaper, the side seal portion extends linearly along the longitudinal direction of the diaper. This linear shape does not change both before and after wearing the diaper.

However, when the side seal portion extends linearly along the longitudinal direction of the diaper in the wearing state of the diaper, the side seal portion and a portion in the vicinity thereof may not easily fit the wearer's body. . In particular, when the side seal part is formed by discontinuously heat-sealing the abdomen and the back part, the hard fusion part formed by heat sealing is likely to irritate the wearer's skin. .

For the purpose of reducing the contact of the side seal portion with the skin, Patent Document 1 describes that the side edge on the inner side in the width direction of the side seal portion is wavy. However, even if this configuration is adopted, the shape of the side seal portion in the wearing state of the diaper is linear, and thus it is still easy to irritate the wearer's skin.

By the way, it is usual that elastic members extending in the transverse direction are arranged in a plurality of strips around the waist of the diaper. In this case, the end of the elastic member reaches the side seal portion. In order to prevent the elastic member from so-called “thread removal”, it is necessary to more firmly join the side seal portion. As a result, the side seal portion becomes harder and it becomes easier to irritate the wearer's skin. Regarding the arrangement of the elastic members in the waist circumference, Patent Document 2 describes the total width W1 from the uppermost elastic yarn to the lowermost elastic yarn of the body fit gather provided on the belly side portion of the diaper. The uppermost elastic yarn at the upper end of the ventral side is made wider than the entire width W2 from the uppermost elastic yarn to the lowermost elastic yarn of the body fit gather provided on the side. It is described that it is arranged on the upper side. However, this configuration is intended to prevent drooping of the back side and the crotch part when the diaper is worn, and is not considered to prevent the side seal portion from stimulating the skin.

Patent Document 3 describes a pants-type disposable diaper in which the side seal portion has a curved shape. An elastic member is disposed on the top of the curved shape. However, the side seal portion has a curved shape from the state before wearing the diaper, and as a result, the appearance before wearing is not good, and when the diaper is worn, May be difficult to open.

In the manufacturing process of the pants-type disposable diaper, the side seal portion is generally formed using a heat roll device. As other joining methods, a method using ultrasonic welding (for example, Patent Document 4) and a method using laser light (for example, Patent Document 5) are also known. Further, Patent Document 6 is not limited to a method for manufacturing an absorbent article, but a laser beam is irradiated to the sheet laminate, and fused portions in which the sheets are fused are arranged in a row in the sheet laminate. It is described that a row of fused portions is formed.

¡Pants-type disposable diapers are usually manufactured through the following processes. 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 denoted by reference numeral 110 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.

¡When removing pants-type disposable diapers for the purpose of disposal, tear the side seals in the vertical direction. However, in the conventional pants-type disposable diaper, the tear of the sheet advances in the lateral direction while tearing the side seal part in the vertical direction due to the formation of the side seal part by the above-described method, and the sheet In some cases, the tears of the diaper may reach the inner part of the diaper rather than the side seal part, or may reach 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 7) has been proposed.

JP 2012-70917 A JP-A-9-271488 Japanese Patent Application Laid-Open No. 2004-73885 JP 2006-82556 A JP 2010-188629 A JP 2012-126130 A JP 2000-14697 A

In recent years, pants-type disposable diapers have been required 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.

In addition, as a method of imparting the same appearance as normal underwear to a pants-type disposable diaper, a conventional method formed by a conventional method using a heat roll device or ultrasonic welding as described in Patent Document 5 described above A method of lowering the protruding height of the side seal portion from the outer surface of the diaper by physically cutting the front end portion of the side seal portion with a cutting means such as a cutter is conceivable. However, the side seal part formed according to the ordinary method is formed by compressing the exterior body in the thickness direction, so the thickness (width) of the fused part of the forming material in the side seal part is compared. Because it is small and easy to be harder than other parts of the outer surface of the diaper, it feels firm when the outer surface of the diaper is touched by hand. Such a tactile sensation of the side seal portion is also a factor that distinguishes a pants-type disposable diaper from normal underwear.

Furthermore, when the method of providing the 2nd junction part extended in the up-down direction in parallel with a side seal part as described in patent document 7, it becomes difficult to make a diaper look like underwear.

The present invention provides a pair of a crotch part, a ventral part and a dorsal part extending from the front and back of the crotch part, and both side edges of the abdomen part and both side edges of the dorsal part. A pants-type disposable diaper having a side seal portion and having a longitudinal direction corresponding to the wearer's front-rear direction and a lateral direction perpendicular thereto is provided.
The side seal portion extends linearly along the longitudinal direction of the diaper in a state before the diaper is worn, and in the longitudinal direction of the diaper in the worn state. It extends in a meandering manner (hereinafter referred to as “the first invention” refers to this invention).

Further, the present invention includes an exterior body that forms the outer surface of the wearing article, and a pair of side seal portions and a waist opening 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 And a pants-type wearing article in which a pair of leg openings are formed.
The side seal portion includes 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. Have.
In the cross-section orthogonal to the direction in which the side seal portion extends, the fusion portion has a width W in the inner and outer directions from the side closer to the wearer's skin of the wearing article at the center position of the width W. When the length in the direction perpendicular to the direction is the thickness T,
The thickness T of the fusion part is smaller than the total thickness (Ta + Tb) of the front body side exterior body and the back body side exterior body, and the fusion part thickness T is the front body side exterior body and the rear body. It is larger than the thickness of at least one of the body-side exterior bodies (Ta or Tb) (hereinafter referred to as “the second invention” refers to this invention).

Furthermore, the present invention includes an exterior body that forms an outer surface of a worn article, and a pair of side seal portions and a waist opening 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 And a pants-type wearing article in which a pair of leg openings are 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 taken, the distance Dw along the inside / outside direction 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. And a pants-type wearing article that is equal to or greater than the distance Dc along the inner / outer direction P between the opposite portion at the outer edge of the fused portion (hereinafter referred to as “third invention”). That means.)

FIG. 1 is a perspective view showing a wearing state of an embodiment of a pants-type disposable diaper of the present invention. FIG. 2 is a developed plan view of the expanded pants-type disposable diaper shown in FIG. 1 as viewed from the top sheet side. 3 is a cross-sectional view taken along line X1-X1 in FIG. FIG. 4 is a schematic diagram showing a side seal portion and a region in the vicinity thereof before the diaper shown in FIG. 1 is worn. FIG. 5 is a schematic diagram illustrating a side seal portion and a region in the vicinity thereof when the diaper illustrated in FIG. 1 is worn. FIG. 6 is a perspective view showing an apparatus suitably used for forming the side seal portion of the diaper shown in FIG. FIGS. 7A to 7C are explanatory views for explaining how the side seal portion is formed at the same time when the diaper continuous body is divided using the apparatus shown in FIG. 6. FIG. 8 is a view (a view corresponding to FIG. 7 (c)) showing another example of a method for manufacturing a pants-type disposable diaper using the apparatus shown in FIG. 6. FIG. 9 is a diagram schematically showing a cross section of the diaper shown in FIG. 1 in the horizontal direction. FIG. 10 is a schematic diagram (corresponding to FIG. 4) showing a side seal part and a region in the vicinity thereof in a state before wearing in another embodiment of the diaper of the present invention. FIG. 11 is a schematic diagram (corresponding to FIG. 5) showing a side seal part and a region in the vicinity thereof in a worn state in another embodiment of the diaper of the present invention. FIG. 12 is a schematic view (corresponding to FIG. 4) showing a side seal part and a region in the vicinity thereof in a state before wearing in still another embodiment of the diaper of the present invention. FIG. 13 is a schematic view (corresponding to FIG. 5) showing a side seal portion and a region in the vicinity thereof in a worn state in still another embodiment of the diaper of the present invention. FIG. 14: is a perspective view which shows typically one Embodiment of the underpants type disposable diaper of 2nd invention. FIG. 15 is a cross-sectional view schematically showing a cross section taken along line II of FIG. FIG. 16 is a plan view schematically showing a developed and extended state of the diaper shown in FIG. FIG. 17 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. 14 and the vicinity thereof. 18A is a schematic side view showing one side of the diaper shown in FIG. 14, and FIG. 18B is a schematic cross-sectional view taken along the line II-II in FIG. 18A. FIG. 19A is a schematic cross-sectional view for explaining a method of measuring the amplitude height in the pseudo wearing state, and FIG. 19B is an enlarged view in a circle of FIG. FIG. 20 is a perspective view schematically showing a manufacturing process of a diaper continuous body in the manufacture of the diaper shown in FIG. FIG. 21: is sectional drawing which shows the cross section orthogonal to the direction where this side seal part extends, which shows the side seal part of the underpants type disposable diaper of 3rd invention, and its vicinity.

Detailed Description of the Invention

Hereinafter, the present invention will be described based on preferred embodiments with reference to the drawings. FIG. 1 shows an embodiment of a pants-type disposable diaper of the first invention. The diaper 1 shown in the figure is a so-called front / rear split type pants-type disposable diaper. The diaper 1 has a longitudinal direction X corresponding to the wearer's front-rear direction and a lateral direction Y orthogonal thereto. The diaper 1 includes a liquid-permeable top sheet 2, a liquid-impermeable back sheet 3, and an absorbent body 4 disposed between these sheets. Moreover, the diaper 1 has the crotch part C and the abdominal part A and the back part B which are extended in the front-back direction of a wearer from the front and back of the crotch part C.

Specifically, as shown in FIGS. 1 and 2, the diaper 1 includes a horizontally-long rectangular ventral sheet member 6 A disposed on the wearer's abdomen and a horizontally-long rectangular disposed on the wearer's back. Shaped backside seat member 6B, absorptive main body 5 fixed over the abdominal side seat member 6A and backside seat member 6B, and three-dimensional gathers disposed on both

sides

5c, 5c of the absorptive main body 5 7. In the diaper 1, the side seal portions S are formed by joining the

side edges

6a, 6a of the abdominal sheet member 6A and the

side edges

6b, 6b of the back seat 6B. By forming the side seal portion S, the diaper 1 is formed with a waist opening WO and a pair of leg openings LO and LO. As shown in FIGS. 1 and 2, the diaper 1 is formed symmetrically with respect to a longitudinal center line CL extending along the longitudinal direction X.

As shown in FIGS. 2 and 3, the absorbent main body 5 includes a liquid-permeable top sheet 2, a liquid-impermeable or water-repellent back sheet 3, and a liquid retaining property disposed between both

sheets

2 and 3. The absorber 4 is provided. The absorptive main body 5 is formed in the rectangular shape long in the vertical direction X, as shown in FIG. The absorber 4 is also formed in a rectangular shape that is long in the longitudinal direction X.

As the top sheet 2, the back sheet 3, and the absorber 4, the same materials as those conventionally used for this type of absorbent article can be used without particular limitation. For example, as the surface sheet 2, a nonwoven fabric having hydrophilicity, a perforated resin film having hydrophilicity, or the like can be used. As the back sheet 3, a resin film, a laminated body of non-woven fabric having water repellency, or the like can be used. As the absorbent body 4, a laminated product of flap pulp, a mixed product of flap pulp and a superabsorbent polymer, an absorbent sheet in which a superabsorbent polymer is held on a pulp sheet, or the like can be used.

The absorbent main body 5 has an area on one end 5a side in the longitudinal direction X fixed to the abdominal sheet member 6A via an adhesive, and an area on the other end 5b side in the longitudinal direction X is on the back side. It is fixed to the sheet member 6B via an adhesive.

In this specification, the vertical direction X corresponds to the direction along the long side of the absorbent main body 5 which is the diaper 1 or its constituent member, that is, the longitudinal direction, and the horizontal direction Y is the absorption of the diaper 1 or its constituent member. This corresponds to the width direction of the sex main body 5.

As shown in FIG. 2, elastic members (not shown) extending in the lateral direction Y of the diaper 1 are stretched at intervals in the longitudinal direction X of the diaper 1 as shown in FIG. There are several. Specifically, as shown in FIGS. 2 and 3, the abdominal sheet member 6 A and the back sheet member 6 B are both an outer layer sheet 61 that forms the outer surface of the diaper 1 and an inner layer disposed on the inner surface side of the outer layer sheet 61. A sheet 62 and a plurality of elastic members (not shown) positioned between the

sheets

61 and 62 and extending along the width direction Y are provided.

The outer layer sheet 61 in the diaper 1 has a length that extends in the longitudinal direction X further than a region where a plurality of thread-like elastic members (not shown) are sandwiched and fixed by the outer layer sheet 61 and the inner layer sheet 62. The extension region 61L (see FIG. 2) of the outer layer sheet 61 extending from the inner layer sheet 62 is folded back toward the absorbent main body 5 and covers the

ends

5a and 5b in the longitudinal direction X of the absorbent main body 5. ing. The folded extension region 61L is bonded to the inner layer sheet 62 by, for example, an adhesive (not shown).

The three-dimensional gathers 7 are arranged on both

side portions

5c and 5c of the absorbent main body 5. 2 and 3, the three-dimensional gather 7 has a first three-dimensional gather 7a extending inward in the width direction Y from the side portion 5c of the absorbent main body 5 and a width from the side portion 5c of the absorbent main body 5. And a second three-dimensional gather 7b extending outward in the direction X. Each of the first three-dimensional gather 7a and the second three-dimensional gather 7b is formed of a three-dimensional gather forming sheet 70 and a plurality of elastic members 71 arranged in an elongated state in the longitudinal direction X of the three-dimensional gather forming sheet 70. ing.

FIG. 4 schematically shows the side seal portion S and a region in the vicinity thereof before the diaper 1 is worn. In a state before the diaper 1 is worn, the side seal portion S extends relatively linearly along the longitudinal direction X of the diaper 1 as compared to the wearing state of the diaper 1. “Relatively linearly extending” means that the state in which the side seal portion S extends is relatively closer to a straight line in the state before the diaper 1 is worn than in the state in which the diaper 1 is worn. It means that. Therefore, it is not necessary that the side seal portion S is completely straight before the diaper 1 is worn, and the side seal portion S is allowed to be slightly corrugated. The positions of the upper sides of the abdominal seat member 6A and the back seat member 6B constituting the side seal portion S are the same, and the positions of the lower sides are also the same.

On the other hand, FIG. 5 schematically shows the side seal portion S and the area in the vicinity thereof when the diaper 1 is worn. In the wearing state of the diaper 1, as shown in the figure, a tensile force F acts in the lateral direction Y of the diaper 1. And in the wearing state of the diaper 1, the side seal part S which was comparatively linear before wearing is deformed by the action of the tensile force F so as to meander and extend along the longitudinal direction X of the diaper 1. Has been made. Since the side seal portion S extends in a meandering manner, in the diaper 1, the side seal portion S and a portion near the side seal portion S can easily follow the wearer's body, and the side seal portion S stimulates the wearer's skin. Is reduced.

From the viewpoint of making the above effect even more remarkable, the side seal portion S meandering in the wearing state of the diaper 1 has a meandering width W (see FIG. 5) in the lateral direction Y of 1 mm or more. Preferably, it is 2 mm or more. Moreover, it is preferable that it is 30 mm or less, and it is still more preferable that it is 20 mm or less. For example, the meandering width W is preferably 1 mm or more and 30 mm or less, and more preferably 2 mm or more and 20 mm or less.

In this embodiment, the side seal part S is relatively straight in the state before wearing, and the side seal part S is meandering in the worn state. A device is devised in the arrangement state of the elastic member located in the periphery of the member 6B. Details are as follows. A plurality of back-side elastic members 80a extending in the lateral direction Y of the diaper 1 are arranged on the abdominal side sheet member 6A in an extended state at intervals in the longitudinal direction X of the diaper 1. Similarly, a plurality of back-side elastic members 80b extending in the lateral direction Y of the diaper 1 are also provided in the back-side sheet member 6B in an extended state at intervals in the vertical direction X of the diaper 1. In the back elastic member 80a, two adjacent intervals La are spaced apart in the longitudinal direction X so that they are equally spaced. Similarly, with respect to the back elastic member 80b, two adjacent intervals Lb with an interval in the longitudinal direction X are equally spaced. La and Lb may be the same or different.

The back-side elastic member 80a and the back-side elastic member 80b are arranged in a region where the abdomen-side sheet member 6A and the back-side sheet member 6B overlap the absorbent main body 5 when the diaper 1 is viewed in a plan view shown in FIG. Absent. Accordingly, the back side elastic member 80a and the back side elastic member 80b extend from one side seal part S to the other side seal part S for those located near the waist opening WO. On the other hand, about what exists in the position away from the waist opening WO, it extends only from the side seal part S to the side edge part of the absorptive main body 5. FIG. As described above, the back-side elastic member 80a and the back-side elastic member 80b include those having two types of extending regions, but at least one end portion of any type of

elastic members

80a and 80b. Reaches the side seal portion S or its vicinity. Here, the vicinity means a range in which the distance from the side seal portion S to the lateral direction Y is within 3 mm.

Focusing on the positions of the end portions in the side seal portion S of the ventral elastic member 80a and the back side elastic member 80b, as shown in FIG. 4, the positions of the end portions in the side seal portion S of the ventral side elastic member 80a and the back side The position of the end portion of the side seal portion S of the elastic member 80b is inconsistent when viewed along the longitudinal direction X of the diaper 1. In this case, it is necessary that the positions of the end portions in the side seal portions S of all the ventral elastic members 80a and the positions of the end portions in the side seal portions S of all the back side elastic members 80b are inconsistent. However, it is only necessary that the end seals are inconsistent so that the side seal part S can be deformed so as to meander and extend in a state where the diaper 1 is worn due to the disagreement of the end positions. The mismatch means that, for example, the distance along the vertical direction X between the end portion of the ventral elastic member 80a and the end portion of the back elastic member 80b located closest thereto is 1 mm or more.

In the present embodiment, the back side of the diaper 1 in the longitudinal direction X of the diaper 1 is spaced at the interval La, and the back side of the two side abdominal elastic members 80a is positioned at a position approximately in the middle of the end seals. The end of the side seal member S of the side elastic member 80b is located. The converse is also true, and at the back side B, at a position approximately in the middle of the position of the end portions of the side seal portions of the two back side elastic members 80b adjacent to each other with a distance Lb in the longitudinal direction X of the diaper 1. The end portion of the side seal portion S of the ventral elastic member 80a is located. Thus, in this embodiment, when the side seal part S in the diaper 1 before wearing is seen along the longitudinal direction X, the end part in the side seal part of the ventral elastic member 80a and the back elastic member 80b. The end portions of the side seal portions are alternately positioned. The “substantially intermediate position” means not only a completely intermediate position but also a shake within a range of ± 5% from the completely intermediate position.

The waist circumference elastic member 80a is worn by wearing the diaper 1 by making the arrangement state of the waist circumference

elastic members

80a and 80b arranged on the abdominal side sheet member 6A and the back side seat member 6B as described above. , 80b, a tensile force F acts in the transverse direction Y, and as a result, the end portions of the waist circumference

elastic members

80a, 80b are directed in the direction of the longitudinal center line CL of the diaper 1. Gravitate. Specifically, with respect to the ventral elastic member 80a, the end portion of the side seal portion S is drawn toward the longitudinal center line CL of the ventral seat member 6A. On the other hand, regarding the back side elastic member 80b, the end part in the side seal part S is drawn toward the direction of the longitudinal center line CL of the back side sheet member 6B. And since the end part in the side seal part of the abdominal elastic member 80a and the end part in the side seal part of the back side elastic member 80b are alternately positioned along the longitudinal direction X of the side seal part S, As a result, as shown in FIG. 5, the side seal portion S is deformed so as to meander in a waveform along the vertical direction X.

As is clear from the above description, in order to deform the side seal portion S so as to meander in the state where the diaper 1 is mounted, the two ventral elastic members 80a adjacent to each other in the longitudinal direction X are spaced apart. It is preferable that the distance La and the distance Lb between two back-side elastic members 80b adjacent to each other with a distance in the vertical direction X are substantially the same. In this case, from the viewpoint of effectively meandering the side seal portion S, the distances La and Lb are preferably 2 mm or more, and more preferably 4 mm or more. Moreover, it is preferable that it is 20 mm or less, and it is still more preferable that it is 15 mm or less. For example, the distances La and Lb are preferably 2 mm or more and 20 mm or less, and more preferably 4 mm or more and 15 mm or less. “Substantially the same” means that the difference between the intervals La and Lb is within 2 mm.

The diaper 1 having the above configuration can be preferably manufactured by the following method. That is, the outer layer sheet 61 and the inner layer sheet 62 are prepared, and in a stretched state, a plurality of ventral elastic members 80a are extended in the same direction between the two sheets, and a gap La is generated between the elastic members 80a. Place and fix. Thus, the ventral sheet member 6A is obtained. Similarly, an outer layer sheet 61 and an inner layer sheet 62 are prepared, and a plurality of back-side elastic members 80b are extended in the same direction between the two sheets, and are stretched so that an interval Lb is generated between the elastic members 80b. Place and fix with. Thereby, the back seat member 6B is obtained. The

respective sheet members

6A and 6B thus obtained are placed in parallel and spaced apart so that their longitudinal directions are in the same direction, and the absorbent main body so as to straddle both

sheet members

6A and 6B 5 is arranged and joined to these

sheet members

6A and 6B. Next, the inner surfaces of both

side edge portions

6a and 6a of the abdominal sheet member 6A and the inner surfaces of both

side edge portions

6b and 6b of the back side sheet member 6B are overlapped with each other, and the overlapped portion is the vertical length of the diaper 1. Join along direction X. And when it overlaps in the shape of a palm, the position of the end part in the side seal part S of the abdominal elastic member 80a and the position of the end part in the side seal part S of the back side elastic member 80b are the vertical direction of the diaper 1. The overlay position is adjusted so that they do not match when viewed along X. In particular, when the distances La and Lb are the same, when the abdominal sheet member 6A and the back sheet member 6B are overlapped with each other, both the sheet members 6A have a distance of half the distance La (Lb). , 6B are displaced in the vertical direction X. By this operation, the diaper 1 which has the side seal part S which deform | transforms successfully and meanders can be manufactured.

The side seal portion S may be formed by a joining portion formed of a continuous line extending along the longitudinal direction X of the diaper 1 or may be formed by an assembly of a plurality of discontinuous joining lines. From the viewpoint of forming the side seal portion S that meanders while drawing a smooth waveform, the side seal portion S is formed by a linear joint portion formed of a continuous line extending along the longitudinal direction X of the diaper 1. Is preferred.

Further, from the viewpoint of successfully forming the side seal portion S meandering with a smooth waveform, the side seal portion S preferably has no non-joint portion as far as possible in the lateral direction Y from the joint portion. . It is most preferable that the non-joined portion is completely absent. However, when the non-joined portion is present, the width is preferably 3 mm or less, particularly 2 mm or less even at the widest portion.

From the same viewpoint, it is also preferable that the width of the joint portion in the side seal portion S is as small as possible. However, if the width of the side seal portion S is excessively reduced, the force for joining the abdomen seat member 6A and the back seat member 6B tends to decrease, and the joint portion breaks down when the diaper 1 is worn. It may end up. Considering these matters, the width of the joint is preferably 0.01 mm or more, and more preferably 0.1 mm or more. Moreover, it is preferable that it is 3 mm or less, and it is still more preferable that it is 2 mm or less. For example, the width of the joint is preferably 0.01 mm or greater and 3 mm or less, and more preferably 0.1 mm or greater and 2 mm or less.

As described above, in order to successfully form the side seal portion S meandering with a smooth waveform, (i) the side seal portion S is a straight line formed of a continuous line extending along the longitudinal direction X of the diaper 1. (Ii) In the side seal portion S, there is no non-joint portion as far as possible in the lateral direction Y from the joint portion, and (iii) in the side seal portion S. It is preferable to form the side seal portion S so as to include at least one, preferably two, more preferably all three of the narrow joint portions. And in order to implement | achieve these structures, it is preferable to form the side seal part S using the laser-type fusing apparatus 120 shown, for example in FIG.

The method for forming the side seal portion S using the laser fusing device 120 shown in FIG. 6 is a side seal having a joint portion fused in a state where the edges of the abdominal sheet member 6A and the back sheet member 6B overlap. A method of forming part S,
At least a part of the stomach side sheet member 6A and the back side sheet member 6B includes a resin material,
The sheet in which the one side of the sheet laminated body in which the abdominal sheet member 6A and the back sheet member 6B are overlapped is brought into contact with a support member having a light passage portion through which laser light can pass, and is in a pressurized state. By irradiating the laminated body with laser light having a wavelength that is absorbed by the sheet constituting the sheet laminated body from the support member side through the light passage portion and generates heat, the sheet laminated body is Simultaneously with the cutting, there is a step of forming the joint by fusing the cut edges of the abdomen-side sheet member 6A and the back-side sheet member 6B in the pressurized state generated by the cutting. Hereinafter, this method will be described with reference to FIG.

As shown in FIG. 6, the laser bonding apparatus 120 is arranged in a hollow cylindrical roll 123 having a cylindrical (annular) support member 121 that is rotationally driven in the direction of arrow A, and in a hollow portion of the support member 121. , An irradiation head 135 for irradiating the laser beam 130, an endless pressure belt 124 (pressing member) as pressure means, and a plurality of

rolls

125a, 125b that rotate in a state where the pressure belt 124 is stretched. And a belt type pressure device 126 provided with 125c. The laser-type bonding apparatus 120 includes a tension adjusting mechanism (not shown) that can adjust the tension of the pressure belt 124 wound around the outer peripheral surface of the annular support member 121 (the peripheral surface portion of the cylindrical roll 123). By adjustment, the pressure applied to the diaper continuous body 110 (sheet laminated body) can be appropriately adjusted by the support member 121 and the pressure belt 124. The diaper continuous body 110 is a precursor for producing the diaper 1 of the present embodiment, and has a shape in which a plurality of diapers 1 are arranged along the lateral direction Y.

The support member 121 forms a peripheral surface portion (contact portion with the workpiece) of the cylindrical roll 123, and is sandwiched between a pair of

annular frames

122 and 122 that form both left and right edge portions of the cylindrical roll 123. It is fixed. The support member 121 is composed of a single annular member having the same length as the circumferential length of the annular frame 122, for example, and has heat resistance such as a metal material such as iron, aluminum, stainless steel, copper, or ceramics. Made of material.

The support member 121 has a light passage portion through which laser light can pass. The support member 121 has a slit-shaped opening 127 that penetrates the support member 121 in the thickness direction as a light passage portion. The opening 127 has a rectangular shape in plan view, and its longitudinal direction coincides with the width direction of the support member 121 (direction parallel to the rotation axis of the cylindrical roll 123), so that the circumference of the cylindrical support member 121 is A plurality are formed at predetermined intervals in the direction. The support member 121 allows the laser light to pass through the opening 127, but does not allow the laser light to pass through (transmits) at portions other than the opening 127. As a method of forming the opening 127 in the support member 121, 1) In addition to a method of drilling the opening 127 in a predetermined portion of the support member 121 by etching, punching, laser processing, or the like, 2) As the support member 121, A method of using a plurality of curved rectangular members in place of one annular member, and arranging the plurality of members between a pair of

frame bodies

122, 122 at a predetermined interval in the circumferential direction of the frame body 122 Is mentioned. In the method 2), the interval between two adjacent members is a slit-shaped opening 127.

In the laser-type bonding apparatus 20, the light passing portion through which the laser light can pass is composed of a slit-like opening 127 that penetrates the support member 121 in the thickness direction, and thus overlaps the opening 127 in the diaper continuous body 10. The part, that is, the part to be divided, is merely brought into contact with the pressure belt 124 and is not sandwiched between the support member 121 and the pressure belt 124. Strictly speaking, therefore, the pressure that is generated by being sandwiched between the two

members

121 and 124 does not occur in the part to be divided. However, even if the part to be divided that overlaps the opening 127 itself is not sandwiched between the two

members

121 and 124, the vicinity thereof, that is, the part that overlaps the vicinity of the opening 127 in the diaper continuous body 110 is both

members

121 and 124. Therefore, the cutting edge portion generated by the division of the diaper continuum 110 by the laser light irradiation does not move. That is, the parting plan part of the diaper continuous body 110 is a part restrained by the pressurization force between the

members

121 and 124, and the pressurizing force is a part that is practically affected.

The belt-type pressure device 126 includes an endless pressure belt 124 and three

rolls

125a, 125b, and 125c that rotate in a state where the pressure belt 124 is bridged. The

rolls

125a, 125b, and 125c may be drive rolls or driven rolls that rotate with the cylindrical roll 123. The pressure belt 124 rotationally drives any one or more of the

rolls

125a, 125b, and 125c, and moves at the same speed as the cylindrical roll 123 (support member 121). The support member 121 and the pressure belt 124 are preferably maintained in a predetermined temperature range by air cooling, water cooling, or the like.

As the pressure belt 124, a heat-resistant metal or resin belt that can withstand the heat generated during processing can be used, and it is made of a metal material such as iron, aluminum, or stainless steel. In addition, as the pressure belt 124, a belt that does not transmit the laser beam irradiated to the diaper continuous body 110, which is a workpiece, is usually used. it can.

As shown in FIG. 6, an irradiation head 135 that irradiates a laser beam 130 toward the support member 121 that forms the peripheral surface portion of the cylindrical roll 123 is provided in the hollow portion of the hollow cylindrical roll 123 (support member 121). ing. The irradiation head 135 is a galvano scanner that freely scans the laser beam 130, a mechanism for moving the laser beam 130 back and forth in a direction parallel to the rotation axis of the cylindrical roll 123, and the diaper continuum 110 on the support member 121. Are provided with a mechanism for moving the position (irradiation point) in the circumferential direction of the cylindrical roll 123, a mechanism for making the spot diameter of the laser light 130 constant on the peripheral surface of the cylindrical roll 123, and the like. With the laser irradiation mechanism having such a configuration, the irradiation point of the laser beam 130 is set in both directions of the circumferential direction of the cylindrical roll 123 and the direction parallel to the rotational axis of the cylindrical roll 123 perpendicular to the circumferential direction. It can be moved arbitrarily.

As shown in FIG. 6, the diaper continuous body 110 includes a support member 121 that forms a peripheral surface portion of a cylindrical roll 123 that is rotationally driven in an arrow A direction in a state where a predetermined tension is applied by a guide roll (not shown). After being introduced onto the outer surface and transported by a predetermined distance in the circumferential direction by the rotation of the cylindrical roll 123 so as to be wound around the support member 121, it is separated from the support member 121 by an unillustrated lead roll, nip roll or the like. In this way, the diaper continuous body 110 is wound around the support member 121 that forms the peripheral surface portion of the cylindrical roll 123 with a predetermined tension and is conveyed so as to be in pressure contact with the pressure belt 124, whereby the diaper continuous body 110. Since the portion sandwiched between the support member 121 and the pressure belt 124 and the vicinity thereof are pressurized in the thickness direction before being divided by the laser light irradiation, the diaper continuous body 110 is made of a synthetic resin. When the nonwoven fabric is included, the diaper continuum 110 can be more efficiently compressed. As a result, when the diaper continuum 110 under compression is irradiated with laser light and divided, It becomes possible to fuse the cut edges of the plurality of sheets constituting the divided portion more reliably, and in the side seal portion S Further improvement in fusion strength of engagement portion can be improved.

The rotation angle of the support member 121 (cylindrical roll 123) from when the diaper continuous body 110 is introduced onto the support member 121 to when the diaper continuous body 110 leaves the diaper continuous body 110 can be, for example, 90 degrees or more and 270 degrees or less. Is 120 degrees or more and 270 degrees or less. In addition, the range of the angle at which the diaper continuous body 110 is pressed against the support member 121 by the pressure belt 124 is 360 ° when the entire circumference of the cylindrical support member 121 (cylindrical roll 123) is pressed. In addition, it is preferably 90 ° or more and 270 ° or less, and more preferably 120 ° or more and 270 ° or less.

In the method for forming the side seal portion S, as shown in FIG. 6, the peripheral surface portion of the cylindrical roll 123 is formed on one surface 110 a (see FIG. 7A) while continuously conveying the diaper continuous body 110. In addition, the diaper continuous body 110 that is in contact with the outer surface of the support member 121 and has a slit-shaped opening 127 through which the laser beam 130 can pass, is pressed from the support member 121 side. The diaper continuum 110 is divided by irradiating the laser beam 130 through the, and at the same time, the cut edges of the plurality of sheets in the pressurized state generated by the division are fused together, The seal portion S is formed.

Specifically, as shown in FIG. 6, the other surface 110 b of the diaper continuous body 110 that is in contact with the support member 121 (see FIG. 7A). One surface 110 a that is a contact surface with the support member 121 and Is pressed against the continuous surface of the diaper 110 in that state by irradiating the laser beam 130 through the slit-shaped opening 127 from the support member 121 side. The diaper 1 having the side seal portion S is continuously manufactured. In this way, the irradiation of the laser beam 130 is performed on the diaper continuum 110 that is in a pressurized state by being sandwiched between the support member 121 and the pressure belt 124. It is preferable from the viewpoint of reliably fusing the cut edge portions of the side seal portion S and improving the fusion strength of the side seal portion S.

FIGS. 7A to 7C are views for explaining a state in which the side seal portion S is formed at the same time as the diaper continuous body 110 is divided by using the laser bonding apparatus 120. FIG. 1 schematically shows a portion 110C to be divided by the laser beam 130 of the diaper continuum 110 and its vicinity. 110 C of division | segmentation scheduled parts of the diaper continuous body 110 are the center of the conveyance direction A in the area | region where the absorptive main body 5 of the diaper continuous body 110 is not arrange | positioned. The parting plan part 110C is a four-layer structure part in which, for example, four sheets are stacked. As shown in FIG. 7A, the four-layer structure portion includes two sheets (outer layer sheet 61 and inner layer sheet 62) in the abdominal sheet member 6A, and two

sheets

61 and 62 in the back sheet member 6B. These four sheets are laminated and configured. The

elastic members

80a and 80b are interposed between the overlapping

sheets

61 and 62, but in FIGS. 7A to 7C, the

elastic members

80a and 80b are illustrated from the viewpoint of easy explanation. Omitted.

In the parting planned portion 110C of the diaper continuous body 110, the outer layer sheet 61 constituting one surface 110a (the contact surface with the support member 121) of the diaper continuous body 110 and a sheet other than the sheet constituting the one surface 110a (inner layer) One or both of the sheets 62) is a sheet that absorbs the laser beam 130 and generates heat. Further, the two overlapping sheets in the vicinity of the parting portion 110C and the vicinity thereof may be joined by an adhesive or the like before irradiation with the laser light 130, or may not be joined at all.

As shown in FIG. 7B, the diaper continuous body 110 is arranged in the direction of the arrow A so that one surface 110a is in contact with the support member 121 and the parting portion 110C is located on the slit-shaped opening 127. While being introduced onto the rotating support member 121 and being pressed against the other surface 110b, the pressure belt 124 is pressed in the thickness direction while being conveyed in the arrow A direction. During the conveyance, the laser beam 130 is irradiated from the support member 121 side through the opening 127 to the parting portion 110C in a pressurized state. As described above, the irradiation point of the laser beam 130 is configured to be arbitrarily movable in the circumferential direction of the cylindrical roll 123, and is set to move following the movement of the opening 127 along the circumferential direction. Therefore, the laser beam 130 is continuously irradiated for a certain period of time to the parting planned portion 110C located on the opening 127 during the transportation.

When the laser beam 130 is irradiated to the parting planned portion 110C, the forming materials (synthetic fibers, etc.) of the

sheets

61 and 62 existing in the parting planned part 110C are vaporized and lost by the heat generated by the direct irradiation of the laser light 130, The forming material existing in the vicinity of the parting portion 110 C is indirectly heated by the laser beam 130 and melts. As a result, as shown in FIG. 7 (c), the part to be cut 110C is melted, and the diaper continuous body 110 is cut off in the form of separating one diaper 1 from the diaper continuous body 110. The cut edges of the four

sheets

61 and 62 in the diaper 1 generated by the cutting and the cut edges of the four

sheets

61 and 62 in the separated diaper continuous body 110 are fused. . Each of these cut edges is in a pressurized state (compressed state) by being sandwiched between the support member 121 and the pressure belt 124 from before the formation (before the diaper continuous body 110 is divided by irradiation of the laser beam 130). ). According to this method, the division of the diaper continuous body 110 and the fusion of the cut edges of the two sheets in the pressurized state caused by the division are performed simultaneously by one laser irradiation. Therefore, compared to the method of fusing two fusion spots by two times of laser light irradiation, fusion and cutting can be carried out in the same process with approximately half the laser output, and the diaper 1 can be manufactured efficiently. Can do. In addition, since the fusion and division can be performed in the same process, a non-joint portion in which the cut edges of the sheet are not fused is not generated, so the side seal portion S does not become stiff, and as a result the diaper 1 Will be able to deform and meander successfully when worn.

The cut edges of the

sheets

61 and 62 are heated and melted during the irradiation of the laser beam 130 and immediately after the irradiation, but each one cut from the diaper continuous body 110 by the irradiation of the laser beam 130. Each of the leaf diaper precursor and the diaper continuum 110 is kept in a pressurized state by the support member 121 and the pressure belt 124 and is easily cooled by contact with the support member 121 after the irradiation. The material is quickly cooled and solidified by heat transfer to the support member 121 and the pressure belt 124 to form a fused portion 140 in which the forming material of the cutting edge is fused and integrated. Thus, by forming the fused part 140, one of the pair of side seal parts S, S in one diaper 1 is formed. If necessary, the cutting edge portions of the

sheets

61 and 62 may be forcibly cooled using a known cooling means such as a suction device or an exhaust device to promote the formation of the fused portion 140.

When one portion 110C to be divided is divided in this way, the laser beam 130 is moved so that the irradiation point hits another opening 127 adjacent in the direction opposite to the conveyance direction A, and the other opening 127 is separated. 110C is irradiated to another parting planned portion 110C located above the part. As a result, another portion 110C to be divided is divided and fused in the same manner as described above, and the other side seal portion S that forms a pair with the previously formed side seal portion S is formed. Thereafter, the same operation is repeated to continuously manufacture the diaper 1 having the pair of side seal portions S, S. In this method, the side seal portion S of the diaper 1 is formed by a fusion method using laser light irradiation, and is not formed by another fusion method.

Compared to the width W of the slit-shaped opening 127 irradiated with the laser beam 130 (see FIG. 7B, the length of the opening 127 along the circumferential direction of the cylindrical roll 123), the diaper continuous body When the diameter φ of the spot of the laser beam 130 at 110 (the portion irradiated with the laser beam 130) is small (when φ / W is less than 1), it is formed by irradiation with the laser beam 130 as shown in FIG. The pair of side seal portions S, S formed is a portion overlapping the opening 127 in the diaper continuous body 110 (a pair of opening edges along the direction orthogonal to the conveying direction A of the slit-shaped opening 127 in plan view) A portion sandwiched between the two). That is, in the diaper continuous body 110, even if it is a portion that is not sandwiched between the support member 121 and the pressure belt 124, the vicinity of the opening 127, that is, as described above, by the sandwiching between both the

members

121 and 124. The fused portion 140 can be formed if the pressure is in effect.

In the diaper 1 obtained in this way, as shown in FIG. 9, the thickness T1 of the side seal portion S is in the side seal portion S of each of the abdominal seat member 6A and the back seat member 6B constituting the side seal portion S. It is larger than the thickness T2 of the adjacent portion. The thickness T1 of the side seal portion S is measured by cutting the side seal portion and observing the cross section with a microscope in a no-load state. The thickness T2 of the abdominal sheet member 6A and the back sheet member 6B is a cross section at a position where the distance from the side seal portion toward the side edge of the absorbent main body 5 from the side seal portion S is in the range of 1 mm to 10 mm. Observed and measured with a microscope. The thickness T2 of the abdominal sheet member 6A and the back sheet member 6B is measured by measuring the distance between the flat plates in a state where a load of 0.5 cN / cm ² is applied with the

sheet members

6A and 6B sandwiched between the flat plates, That value is the thickness. The measurement of the thickness of the side seal part using a microscope is performed at a magnification of 50 to 200 times by using a microscope (VHX-1000 manufactured by KEYENCE) with three cross sections separated in the longitudinal direction in the side seal part of one diaper. Observing and obtaining the thickness in each cross section, it can be obtained as an average value of the measured thickness of three places. The thickness T1 of the side seal portion S is preferably 0.2 mm or more, more preferably 0.25 mm or more, preferably 2 mm or less, more preferably 1.5 mm or less. The thickness T1 of the side seal portion S is preferably 0.2 mm or more and 2 mm or less, for example, and more preferably 0.25 mm or more and 1.5 mm or less.

As the laser beam used in the manufacturing method described above, a laser beam having a wavelength that is absorbed by the sheet constituting the diaper continuous body 110 and generates heat is generated. The sheet constituting the diaper continuous body 110 is not particularly limited, and any sheet may be used as long as it forms the diaper continuous body 110. Whether or not the laser beam applied to the diaper continuum 110 is a wavelength that causes each sheet constituting the diaper continuum 110 to be absorbed by the sheet and generate heat, depends on the material of the sheet and the use. Determined by the relationship with the wavelength of the laser beam. When the sheet constituting the diaper continuous body 110 is a non-woven fabric or a film made of a synthetic resin widely used for manufacturing absorbent articles (sanitary products) such as disposable diapers and sanitary napkins, the laser light may be a CO ₂ laser. It is preferable to use YAG laser, LD laser (semiconductor laser), YVO ₄ laser, fiber laser, or the like. Moreover, when the sheet | seat which comprises the diaper continuous body 110 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, it is 8.0 micrometers or more, for example It is preferable to use 15.0 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 diaper continuous body 110.

10 and 11 show another embodiment of the present invention. In addition, the description regarding previous embodiment applies suitably about the point which is not demonstrated especially regarding this embodiment. 10 and 11, the same members as those shown in FIGS. 1 to 8 are denoted by the same reference numerals. In the diaper 1 of the present embodiment, a plurality of abdominal side first part elastic members 81a and abdominal side second part elastic members 82a extending in the lateral direction Y of the diaper 1 are provided in the abdominal side sheet member 6A in a stretched state. It is arranged. Similarly, the back side sheet member 6AB is provided with a plurality of back side first elastic members 81b and back side second part elastic members 82b extending in the lateral direction Y of the diaper 1 in an extended state.

Among the plurality of

elastic members

81a and 82a disposed on the ventral sheet member 6A, the ventral side first portion elastic member 81a is a ventral high elongation stress elastic member having a relatively high elongation stress. On the other hand, the ventral side second portion elastic member 82a is a ventral low elongation stress elastic member having a relatively low elongation stress. The ventral side first part elastic member 81 a and the ventral side second part elastic member 82 a are alternately arranged along the longitudinal direction X of the diaper 1. The interval between the ventral side first part elastic member 81a and the ventral side second part elastic member 82a is equal.

Regarding the back side seat member 6B, among the plurality of

elastic members

81b, 82b arranged on the back side seat member 6B, the back side first portion elastic member 81b is a ventral side high with relatively high elongation stress. It is an elongation stress elastic member. On the other hand, the back side second portion elastic member 82b is a ventral low elongation stress elastic member having a relatively low elongation stress. The back side first part elastic member 81 b and the back side second part elastic member 82 b are alternately arranged along the longitudinal direction X of the diaper 1. The distance between the back side first part elastic member 81b and the back side second part elastic member 82b is equal. This interval is the same as the interval between the ventral side first portion elastic member 81a and the ventral side second portion elastic member 82a described above.

Elongation stress is a load required to pull an elastic member along a longitudinal direction for a predetermined length. A large elongation stress means that a load required for pulling a predetermined length is large. In the present embodiment, the abdominal side first part elastic member 81a, which is an elastic member that exhibits relatively high elongation stress, is a back side second part elasticity that is an elastic member that exhibits relatively low elongation stress. The elongation stress is relatively higher than that of the member 82b. And the back side 1st part elastic member 81b which is an elastic member which shows relatively high extension stress is more elastic than the ventral side 2nd part elastic member 81b which is an elastic member which shows relatively low extension stress. The elongation stress is relatively high.

Furthermore, in the present embodiment, the extension stress of the abdominal part first part elastic member 81a and the extension stress of the dorsal part first part elastic member 81b, which are elastic members exhibiting a relatively high extension stress, are substantially equal. I'm doing it. Further, the extension stress of the abdominal side second part elastic member 81b, which is an elastic member that exhibits a relatively low extension stress, and the extension stress of the back side second part elastic member 82b substantially coincide with each other. The term “substantially coincides” means that the difference in elongation stress between the two elastic members is within 1.5 times.

The

elastic members

81a and 82a disposed on the abdominal seat member 6A and the

elastic members

81b and 82b disposed on the back seat member 6B are located at the end positions of the side seal portions S of the elastic members. When viewed along the vertical direction X, the positions of the end portions of the side seal portions S of the

elastic members

81a and 82a disposed on the ventral seat member 6A and the

elastic members

81b and 82b disposed on the back seat member 6B. The position of the end portion in the side seal portion S substantially coincides. And when it sees along the vertical direction X of the diaper 1, the position of the abdominal part 1st part elastic member 81a and the position of the back part 2nd part elastic member 82b are substantially corresponded, and abdominal side The position of the part second part elastic member 82a and the position of the back side first part elastic member 81b substantially coincide. The term “substantially coincides” means that the degree of positional deviation is within 2 mm.

When the diaper 1 having the above configuration is worn, a tensile force F acts on each elastic member in the lateral direction Y, and as a result, the end of each elastic member is the vertical center line of the diaper 1. It is drawn toward the direction of CL. At this time, in the ventral side first part elastic member 81a and the dorsal side second part elastic member 82b positioned at the same height in the longitudinal direction X, the ventral side first part elastic member 81a is more elastic. Since both are relatively high, both the end portions of the ventral side first portion elastic member 81a and the dorsal side second portion elastic member 82b are drawn toward the longitudinal center line CL of the ventral seat member 6A. . On the other hand, in the abdominal side second part elastic member 82a and the back side first part elastic member 81b located at the same height in the longitudinal direction X, the back side first part elastic member 81b has an extensional stress. Since they are relatively high, both the end portions of the abdominal side second portion elastic member 82a and the back side first portion elastic member 81b are drawn toward the longitudinal center line CL of the back side seat member 6B. The abdominal side second part elastic member 82 and the back side first part elastic member 81b, and the abdominal side second part elastic member 82a and the back side first part elastic member 81b correspond to the side seal portion S. Since they are alternately positioned along the vertical direction X, the side seal portion S is deformed so as to meander in a waveform along the vertical direction X as shown in FIG.

In order to control the elongation stress of each elastic member, for example, the following methods (a) to (c) can be employed.
(A) The elongation rate when the high elongation stress elastic member and the low elongation stress elastic member are arranged and fixed in the stretched state is made the same, and the thicknesses of these elastic members are made different. Specifically, a relatively large diameter elastic member is used as the high elongation stress elastic member, and a relatively small diameter elastic member is used as the low elongation stress elastic member.
(B) An elastic member having the same thickness is used as the high elongation stress elastic member and the low elongation stress elastic member, and the degree of the extension state when these are arranged and fixed in the extension state is varied. Specifically, the high elongation stress elastic member is extended and fixed at a relatively high extension magnification, and the low extension stress elastic member is extended and fixed at a relatively low extension magnification.
(C) Combine (a) and (b).

FIG. 12 and FIG. 13 show still another embodiment of the diaper of the present invention. Embodiment shown in these figures has shown the side seal part S in the state before wearing the diaper 1, and the site | part of the vicinity. The embodiment shown in these drawings is a modification of the embodiment shown in FIGS. 4 and 5. Therefore, the description of the embodiment shown in FIG. 4 and FIG. 5 is appropriately applied to points that are not particularly described here.

Each of the embodiments shown in FIG. 12 and FIG. 13 is devised for improving the visibility of the formation position of the side seal portion S and facilitating the tearing operation of the side seal portion S when the diaper 1 is discarded. ing. In order for the side seal portion S to be deformed and easily meander while the diaper 1 is attached, it is advantageous to employ at least one of the configurations (i) to (iii) described above. However, adopting these configurations (i) to (iii) tends to reduce the visibility of the side seal portion S. Therefore, in the embodiment shown in FIG. 12, the step D1 is provided on the upper portion of the side seal portion S by making the position of the upper side of the abdominal sheet member 6A different from the position of the upper side of the back side sheet member 6B. The position of the side seal portion S is easily visible. At the same time, the position of the side seal portion S can be changed by providing the step D2 below the side seal portion S by making the position of the lower side of the ventral seat member 6A different from the position of the lower side of the back seat member 6B. Is easy to see. The steps D1 and D2 contribute not only to improving the visibility of the side seal portion S but also to improving the ease of tearing of the side seal portion S.

In the embodiment shown in FIG. 13, the position of the upper side of the abdominal sheet member 6A is the same as the position of the upper side of the back side sheet member 6B, but a wedge-shaped notch is formed above the side seal portion S. A notch N1 is provided to make it easy to visually recognize the position of the side seal portion S. In this embodiment, the position of the lower side of the abdominal seat member 6A and the position of the lower side of the back seat member 6B are the same, but a notch N2 that is a wedge-shaped notch is provided at the lower part of the side seal portion S. The provision of the side seal portion S also facilitates visual recognition. The notches N1 and N2 contribute not only to improving the visibility of the side seal portion S but also to improving the ease of tearing of the side seal portion S.

Next, the second invention will be described with reference to FIGS. For points that are not particularly described with respect to the second invention, the description detailed with respect to the first invention is applied as appropriate. 14 to 20, the same members as those in FIGS. 1 to 13 are denoted by the same reference numerals.

The second invention relates to a pants-type disposable diaper having an underwear-like appearance, having a side seal portion, and having a soft side seal portion and excellent touch. As shown in FIGS. 14 to 16, a pants-type disposable diaper 101 according to an embodiment of the second invention includes an absorbent main body 102 and an exterior body 103 that forms an outer surface of a worn article, and includes a front body F ( Left and right side edges A1, A1 along the longitudinal direction X of the exterior body 103 in the ventral side 101A) and left and right side edges B1, B1 along the longitudinal direction X of the exterior body 103 in the back body R (back side part 101B) Are joined to form a pair of

side seal portions

104, 104, a waist opening 108, and a pair of

leg openings

109, 109. The exterior body 103 is positioned on the non-skin contact surface side of the absorbent main body 102 and fixes the absorbent main body 102.

The diaper 101 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 developed and extended plan view as shown in FIG. The diaper 101 can be divided into a crotch part 101C disposed at the crotch part when worn, and a ventral part 101A and a dorsal part 101B positioned in the longitudinal direction X. The exterior body 103 in the crotch part 101 C is formed with recesses for forming

leg openings

109, 109 at the left and right side edges along the vertical direction X. In addition, as shown in FIG. 17, the diaper 101 can be divided into a front body F and a back body R with a virtual center line CL that bisects the diaper 101 in the longitudinal direction X as a boundary.

In the present specification, the skin contact surface is a surface of the pants-type disposable diaper or its constituent member (for example, an absorbent main body) that is directed toward the wearer's skin when worn, and the non-skin contact surface is In the pants-type disposable diaper 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 101, the vertical direction X corresponds to the direction (longitudinal direction) along the long side of the absorbent main body 102 which is a pants-type disposable diaper or its constituent member, and the horizontal direction Y is a pants-type disposable diaper or its constituent member. This corresponds to the width direction of the absorbent main body 102.

As shown in FIG. 16, the absorbent main body 102 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 102 is joined to a central portion of the exterior body 103 by a known joining means (adhesive or the like) so that the longitudinal direction thereof coincides with the longitudinal direction X of the diaper 101 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. 15 and 16, the outer package 103 is arranged on the outer layer sheet 131 that forms the outer surface of the diaper 101 (the non-skin contact surface of the outer package 103), and the inner surface side of the outer layer sheet 131. An inner layer sheet 132 that forms the inner surface of 101 (skin contact surface of the outer package 3), and a plurality of thread-like or belt-like

elastic members

105, 106, 107 fixed between the

sheets

131, 132 with an adhesive. It is configured to include. The two

sheets

131 and 132 are joined to each other at a predetermined site by an adhesive or heat seal (not shown).

The exterior body 103 (the outer layer sheet 131 and the inner layer sheet 132) includes a resin material and is formed using the resin material as a main component. As an example of the outer package 103 (outer layer sheet 131, inner layer sheet 132), the resin material includes a heat-sealable synthetic resin such as polyethylene, polyethylene terephthalate, polypropylene, etc., and from a nonwoven fabric, a film, a laminated 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. 15, the pair of

side seal portions

104, 104 in the diaper 101 has an edge portion of the exterior body 103 in the front body F and an edge portion of the exterior body 103 in the back body R, respectively, of the side seal portion 104. It has a seal edge portion 141 joined by a continuous linear fused portion 140 extending in the longitudinal direction. The seal edge 141 in the diaper 101 is formed continuously over the entire length between the waist opening 108 and the leg opening 109 in each of the

side seal portions

104 and 104. The fused portion 140 in the seal edge portion 141 is obtained by melting and solidifying constituent resins of a plurality of sheets (outer layer sheet 131, inner layer sheet 132) constituting the exterior body 103 in a state where the edge portions overlap each other. Is formed.

As shown in FIG. 17, the fused portion 140 in the seal edge portion 141 has a cross section orthogonal to the direction in which the side seal portion 104 extends, in the inner and outer direction P toward the far side from the side closer to the wearer's skin of the wearing article. When the length 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 thickness T of the fused portion 140 is the outer body 103 on the front body 101A side. In addition, the total thickness (Ta + Tb) of the outer body 103 on the back body 101B side is equal to or smaller than the total thickness (Ta + Tb), and the thickness T of the fused part 140 is the outer body 103 on the front body 101A side and the outer body on the back body 1B side. It is larger than at least one of the thicknesses 103 (Ta or Tb).

The thickness Ta of the exterior body 103 on the front body 101A side and the thickness Tb of the exterior body 103 on the back body 101B side are both thicknesses at portions other than the side seal portion 104, and preferably the front body 101A and the back body 101B. For each of these, the thickness is measured when the distance Lt from the fused portion 140 in the diaper lateral direction Y (see FIG. 15) is in the range of 1 mm to 11 mm.
The thickness Ta and the thickness Tb were measured by applying a load of 0.5 cN / cm ² with a sample cut from each of the outer body on the front body 101A side and the outer body on the back body 101B side sandwiched between flat plates. The distance between the flat plates in the state was measured, and the value was 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 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 thickness Ta, the thickness Tb, and the width and thickness of the fused portion were measured for three different cross sections in the direction along the side seal portion 104, 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.

The reason for measuring the thickness T of the fused part 140 at the center position that bisects the width W of the fused part 140 is to measure the thickness corresponding to each of various seal-shaped samples. This is because it can be done.
Further, the outer edge 104a of the fused part 140 has a shape that is greatly recessed inward in the inner / outer direction P, and a part of the outer edge 104a is inward from a line that bisects the width W of the fused part 140. The thickness T of the fused portion includes the thickness of the space portion inside the line that bisects.

By making the thickness T of the fused part 140 the same as or smaller than the total thickness (Ta + Tb) of the outer body 103 on the front body 101A side and the outer body 103 on the rear body 101B side, Pressure is applied and firmly fused.
Moreover, since the thickness T of the fusion bonding portion 140 is larger than at least one of the thickness Ta and the thickness Tb, the sealing portion is soft and soft to the touch. Here, “feeling good” means that the wearer feels well.

In particular, when the thickness T of the fusion bonding portion 140 is larger than each of the thickness Ta and the thickness Tb, since the melted portion is not excessively melted and solidified, the sealing portion becomes soft, and the appearance and the touch are further improved. .

Further, the thickness T of the fused part 140 is preferably a ratio (%) to the total thickness (Ta + Tb) of the outer body on the front body 101A side and the back body 101B side from the viewpoint of the fusion strength of the side seal part. % 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 the appearance, touch, and fusion strength of the side seal portion. From the viewpoint, it is preferably 30 to 100%, more preferably 50 to 95%.

Further, the thickness T of the fusion part 140 is a difference (Ta + Tb−T) from the total thickness (Ta + Tb) of the outer body on the front body 101A side and the back body 101B side, from the viewpoint of the fusion strength of the side seal part. Preferably, it is 0 mm or more, more preferably 0.02 mm or more, and from the viewpoint of touch, it is preferably 0.25 mm or less, more preferably 0.2 mm or less, and the fusion strength and touch of the side seal part. From this viewpoint, the thickness 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 140 to the thickness Ta of the outer body on the front body 101A side and the thickness Tb of the outer body on the back body 101B side is preferably 110% from the viewpoint of the touch. Above, 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. Also, the fusion strength and touch of the side seal portion. From this viewpoint, it is preferably 110 to 300%, more preferably 150 to 200%.

Further, the thickness T of the fused portion 140 is different from the thickness Ta of the outer body on the front body 101A side and the thickness Tb of the outer body on the back body 101B side (T−Ta, T−Tb). From the viewpoint, preferably 0.05 mm or more, more preferably 0.1 mm or more, and from the viewpoint of the fusion strength of the side seal part, preferably 2.0 mm or less, more preferably 1.0 mm or less, Further, from the viewpoint of the fusion strength and the touch of the side seal portion, it is preferably 0.05 to 2.0 mm, more preferably 0.1 to 1.0 mm.

Further, it is preferable that the width W of the fused part 140 is smaller than the thickness T of the fused part 140 because an advantageous effect that the touch is further improved can be obtained. From the same viewpoint, the width W of the fused portion 140 is preferably 95% or less, more preferably 50% or less, and preferably 10% or more, more preferably 30% or more of the thickness T. Further, it is preferably 10 to 95%, more preferably 30 to 70%.

In addition, the width W of the fused portion 140 is preferably smaller from the viewpoint of improving the flexibility and feel of the side seal portion, for example, preferably 2.0 mm or less, more preferably less than 1.0 mm, and still more preferably. 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 140 is preferably larger than the width W of the fused part 140. For example, when the width W of the fused part 140 is less than 0.3 mm, the fused part 140 The thickness T of 140 is preferably 0.3 mm or more.

Realizing such a size relationship of each part, in particular, making the thickness T of the fused part 140 larger than the thickness Ta of the outer body on the front body 101A side or the thickness Tb of the outer body on the back body 101B side. Is not usually achieved by a method for forming a 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 fused portion is usually smaller than the thickness of the outer body on the front body 101A side or the back body 101B side. In order to set the thickness T of the fused portion 140 to the thickness Ta and / or Tb of the exterior body as in the present embodiment, the degree of compression of the exterior body 103 in the thickness direction is reduced in the step of forming the side seal portion 104. It is important to form the side seal portion 104 while suppressing it. As a method of forming the side seal portion 104 while suppressing the compression of the outer package 103, fusing using a laser beam can be given. That is, a method of forming the side seal portion 104 by using a laser beam as a fusing means of the outer package 103 and irradiating the laser beam to a portion where the side seal portion 104 is to be formed in the outer package 103 and fusing it. It is done.

In the diaper 101 of the present embodiment, as shown in FIG. 18, the exterior body 103 is provided at a portion adjacent to the side seal portion 104 in each of the exterior body 103 on the front body 101 A side and the exterior body 103 on the back body 101 B side. Concavity and

convexity regions

143 and 143 whose cross-sectional shape forms a continuous wave shape are formed by contraction of the elastic member 106 disposed in the region. In the concavo-convex region 143, the two

sheets

131 and 132 constituting the exterior body 103 are in close contact with each other with no adhesive, and they are integrally deformed into a corrugated cross section.
In addition, an elastic stretchable portion 144 having a structure different from that of the concavo-convex region 143 is formed on the diaper width direction center side of the concavo-convex region 143 on each side of the side seal portion 104. In the elastic stretchable part 144, the two

sheets

131 and 132 constituting the exterior body 103 are joined at a number of joints 133 that are intermittently arranged in the longitudinal direction X and the width direction Y of the diaper 101. The plurality of

elastic members

105 and 106 extending in the horizontal direction Y are arranged so as to pass between the adjacent joints 133 in the vertical direction X, respectively. Then, due to the contraction of the elastic member 106, the portions located between the joints 133 in the two

sheets

131 and 132 swell away from each other as shown in FIG. Is formed. The

elastic members

105 and 106 are not bonded to any of the

sheets

131 and 132 in the elastic expansion / contraction part 144, but are bonded to the

sheets

131 and 132 in a pair of fixing regions located on both sides of the elastic expansion / contraction part 144. It is fixed through the agent. For the elastic member 105, a pair of uneven regions 143 formed in the vicinity of the pair of side seal portions 104 is the one fixed region, and for the elastic member 106, uneven portions formed in the vicinity of the side seal portion 104. The region 143 is one fixing region, and the other fixing region is formed in the vicinity of the side edge extending in the longitudinal direction of the absorbent main body 105. The joint part 133 shown in FIG. 18A is arranged such that a plurality of joint part rows formed of joint parts 133 intermittently arranged in the longitudinal direction X of the diaper 101 are formed in the lateral direction Y of the diaper. The positions in the longitudinal direction X of the joint portions of the adjacent joint row are the same. In the joint portion 133, the

sheets

131 and 132 may be joined by an adhesive, may be joined by heat fusion such as heat sealing, or may be joined by another joining method.

And in the wearing state of the diaper 101 of this embodiment, the width W of the fusion | melting part 104 is smaller than the amplitude height h of this uneven | corrugated area | region 143. FIG. Since there are individual differences in the size and shape of the wearer's waist, whether or not the thickness T of the fused portion 104 is larger than the amplitude height of the uneven region 143 in the wearing state is determined in the pseudo wearing state shown below. To do.
<Pseudo wearing state>
A state in which the elastic member is contracted (a state in which no force is applied from the outside) is a natural length, and a state in which the elastic member is stretched to be 1.5 times is a pseudo-wearing state.

Thus, in the pseudo wearing state, the width W of the fused portion 104 is smaller than the amplitude height h of the uneven region 143, so that the fused portion 104 is more difficult to touch the skin of the wearer, parent, caregiver, or the like. Thus, the feel of the side seal portion 1 and the outer surface of the diaper is further improved. From the viewpoint of the difficulty of touching the skin and the improvement of the touch, the width W of the fused portion 104 is preferably 70% or less, more preferably 50% or less of the amplitude height h of the uneven region 143, and more preferably 20 % Or less.

The technical elements related to the first invention described above can be combined with the technical elements related to the second invention. By such a combination, the advantageous effect exhibited by the pants-type disposable diaper of the first invention becomes more remarkable.

Specifically, in the first invention described above, the technical element of the second invention can be adopted for the side seal portion 104. For example, the side seal portion 104 of the pants-type disposable diaper 101 of the second invention has the seal edge portion 141 joined by the continuous linear fusion portion 140 as described above. The thickness T of the fused portion 141 is the same as or smaller than the total thickness of the exterior body 103 on the abdominal side 101A side and the exterior body 103 on the back side 101B side, and the thickness T of the fused portion 141 is It is larger than the thickness of at least one of the exterior body 103 on the ventral side 101A side and the exterior body 103 on the back side 101B side. And in one preferable embodiment of this underpants type disposable diaper 101, the side seal part 104 is the longitudinal direction of this diaper 101 compared with the wearing state of this diaper 101 in the state before wearing of the diaper 101. The diaper 101 extends in a meandering manner along the longitudinal direction X of the diaper 101 in a wearing state.

The pants-type disposable diaper 101 of the second invention can be manufactured, for example, by a manufacturing method described below.
The manufacturing method of the diaper 101 is in a pressurized state, a polymerization pressurizing step in which the site where the side seal portion is to be formed in the strip-shaped exterior body 103 in a state where the front body side and the back body side are overlapped is in a pressurized state. The exterior body 103 is divided by irradiating the portion where the side seal portion is to be formed with a laser beam through a light passing portion extending in a direction intersecting the conveyance direction A of the exterior body 103, and by the division And a side seal portion forming step of forming the side seal portion 104 by fusing the cut edges of the laminated exterior body that are generated. Moreover, the main body fixing process which fixes the absorptive main body 102 to the strip | belt-shaped exterior body 103 (the outer layer sheet 131, the inner layer sheet 132) is comprised before the superposition | polymerization pressurization process.

More specifically, in the manufacturing method of the diaper 101, as shown in FIG. 20, in the polymerization pressurizing step, the strip-shaped exterior body 103 (outer layer sheet 131, inner layer sheet 132) is folded in the width direction. The front body side and the back body side of the strip-shaped exterior body 103 to which the absorbent main body 102 is fixed are overlapped, whereby “a precursor of a pants-type disposable diaper having no side seal portion formed in one direction” A continuous diaper body 110 "is produced. In the side seal portion forming step, the strip-shaped exterior body 103 in the diaper continuous body 110 is individually divided (melted) by laser light irradiation, and at the same time, a plurality of laminated states generated by the division are obtained. The pants-type disposable diaper 101 including the exterior body 103 having a pair of

side seal portions

104 and 104 is continuously bonded by fusing the cut edges of the exterior body 103 (outer layer sheet 131, inner layer sheet 132). To manufacture.

More specifically, first, as shown in FIG. 20, a strip-shaped outer layer sheet 131 continuously supplied from an original fabric roll (not shown) and continuously supplied from an original fabric roll (not shown). Between the belt-shaped inner layer sheet 132 to be formed, a waist elastic member 105 that forms a waist gather, a waist elastic member 106 that forms a waist gather, and a leg elastic member 107 that forms a leg gather have a predetermined elongation rate. A plurality of each are arranged in the stretched state. At this time, the leg elastic member 107 is disposed 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 131 and the belt-like inner layer sheet 132 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 105 and the waistline elastic member 106 are divided by the laser light irradiation in both the sheets 131 and 132 (the portion where the side seal portion 104 is to be formed, as described above). 7 in order to avoid inconveniences such as significant shrinkage of the elastic member and disconnection of the elastic member after the division, It is preferable to apply an adhesive to the part and its vicinity. The concave and

convex regions

143 and 143 on both sides of the diaper 101 sandwiching the side seal portion 104 have an adhesive interposed between the outer layer sheet 131 and the inner layer sheet 132 in the vicinity of the portion where the side seal portion 104 is to be formed, and the elastic member 105. , 106, the

elastic members

105, 106 are contracted together with the

sheets

131, 132. A hot melt adhesive is intermittently applied to the waist elastic member 105 and the waist elastic member 106 by an adhesive application machine (not shown) before being disposed between the

sheets

131 and 132. May be.

Then, as shown in FIG. 20, a belt-shaped outer layer sheet 131 and a belt-shaped outer layer sheet 131 in which a waist elastic member 105, a waistline elastic member 106, and a leg elastic member 107 are sandwiched between a pair of nip rolls 111, 111. By feeding and pressurizing the inner layer sheet 132, a band-shaped exterior body 103 in which a plurality of

elastic members

105, 106, 107 are arranged in an expanded state between the band-shaped

sheets

131, 132 is formed.
Moreover, in the formation process of this exterior body 103, the some joint part 133 which joins the strip | belt-shaped outer-layer sheet 131 and the strip | belt-shaped inner-layer sheet | seat 132 between two adjacent trunk periphery

elastic members

106 and 106 is made into a convex roll. 112 and a corresponding joining means such as an anvil roll 113.
Thereafter, if necessary, a plurality of waistline elastic members 106 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 102 described later is disposed. The member 107 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. 20, an adhesive such as a hot-melt adhesive is applied in advance to the absorbent main body 102 manufactured in a separate process, and the absorbent main body 102 is rotated by 90 degrees to form a belt-shaped outer package. It is intermittently supplied and fixed on the inner layer sheet 132 constituting 103 (main body fixing step). Then, as shown in FIG. 20, a leg hole LO ′ is formed inside the annular portion that is annularly surrounded by the leg elastic member 107 in the strip-shaped exterior body 103 in which the absorbent main body 102 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 103 is folded in the width direction (a direction orthogonal to the conveyance direction of the exterior body 103). More specifically, as shown in FIG. 20, both

side portions

103 a and 103 a along the conveying direction of the belt-shaped outer package 103 are folded back so as to cover both longitudinal ends of the absorbent main body 102, and After fixing both ends in the longitudinal direction, the outer package 103 is folded in two in the width direction together with the absorbent main body 102 (polymerization step in the polymerization pressure step). In this way, the diaper continuous body 110 is obtained.

Next, the diaper continuous body 110 thus manufactured is irradiated with laser light using a laser-type bonding apparatus to form a pair of side seal portions 104 and 104 (side seal portion forming step), and the pair of the side portions A pants-type disposable diaper 101 including an exterior body 103 having a seal portion 104 is continuously manufactured. The laser-type bonding apparatus and the method for forming the side seal portion 104 using this apparatus are the same as in the first invention, and the details thereof are shown in FIGS.

In the diaper 101 manufactured in this manner, the edge A1 of the exterior body 103 in the front body F and the edge B1 of the exterior body 103 in the back body R extend in the longitudinal direction of the side seal portion 104 in the side seal portion 104. A sealing edge 141 joined by a continuous linear fused portion 140 is formed. In addition, the thickness T of the fused portion 140 is equal to or smaller than the total thickness (Ta + Tb) of the exterior body 103, and the thickness Ta of the exterior body 103 on the front body side or the thickness Tb of the exterior body 103 on the back body side. The larger side seal portion 104 can be easily obtained by appropriately adjusting the degree of pressurization when irradiating laser light, the output of laser light, and the spot diameter.
The seal edge 141 has a shape in which the outer edge 104a formed of the fused portion 140 is recessed toward the inside of the diaper 101 in a cross section orthogonal to the direction in which the side seal portion 104 extends when worn. .
Further, as shown in FIG. 17, the seal edge portion 141 does not have a portion where the constituent fibers of the exterior body 103 leave the fiber shape outside the fused portion 140 in the inner and outer directions P. Therefore, the appearance is good and the touch is improved.

The diaper 101 including a pair of

side seal portions

104 and 104 obtained through a process in which the outer body 103 is divided and welded at the same time is superior in flexibility and touch of the side seal portion 104, and feels worn. Is good.

Next, the third invention will be described with reference to FIG. For points that are not specifically described with respect to the third invention, the descriptions in detail regarding the first invention and the second invention are applied as appropriate. In FIG. 21, the same members as those in FIGS. 1 to 20 are denoted by the same reference numerals.

3rd invention is related with the underpants type disposable diaper which the side tear of a side seal part does not produce easily and can be removed after use easily and smoothly. The pants-type disposable diaper of the third invention has the same structure as the pants-type disposable diaper of the second invention except that the structure of the side seal portion 104 is different from the pants-type disposable diaper of the second invention. Therefore, here, the pants-type disposable diaper of the third invention will be described focusing on the structure of the side seal portion 104.

In the pants-type disposable diaper according to the third aspect of the invention, as shown in FIGS. 15 and 21, the fused portion 140 at the seal edge portion 141 is worn by the wearer of the diaper 101 in a cross section orthogonal to the direction in which the side seal portion 104 extends. When the direction from the side close to the skin to the side far from the skin is the inside / outside direction P and the direction perpendicular to the inside / outside direction P is the thickness direction Q, both

end portions

104a and 104b in the thickness direction Q and the both end portions The distance Dw along the inner / outer direction P between the inner end 104c closest to the wearer's skin between 104a and 104b is the distance between the inner end 104c and the facing portion 104d ′ at the outer edge 104d of the fused portion. It is more than the distance Dc along the inner / outer direction P.

The distance Dw between the both

end portions

104a and 104b and the inner end portion 104c in the thickness direction Q is a distance measured along a straight line parallel to the inner and outer directions P. When the position of the end portion 104a on the front body 101A side and the position of the end portion 104b on the back body 101B side are different in the inner / outer 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 104c and the portion 104d 'facing the inner end 104c at the outer edge 104d of the fused portion along a straight line parallel to the inner / outer direction P. To measure. A portion 104d ′ facing the inner end portion 104c is a portion where a straight line passing through the inner end portion 104c and parallel to the inner / outer direction P intersects with the outer edge 104d of the fused portion 140.
In the side seal portion 104 of the diaper 101 of the present embodiment, the position of the inner end portion 104c of the fused portion 140 in the thickness direction Q is the position of the end portion 104a on the front body 101A side and the back body 101B side. Is located at a central position that bisects the distance in the thickness direction Q with respect to the position of the end portion 104b. The inner end portion 104c in the present invention is located on the side of either

end portion

104a, 104b from the central position. It may exist in a biased 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 no load 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 104, 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 140 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 101 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 104 is in the inner and outer direction P. The outer portion H of the inner end portion 104c is more easily broken than the inner portion G of the inner end portion 4c. In particular, the fiber form of the fused portion 140 and the outer package 103 in the outer portion H. It has been found that breakage is likely to occur in the boundary portion 104e with the remaining portion and the fused portion 140.
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 140, and to significantly suppress the risk of lateral tearing when tearing the side seal portion.

From the viewpoint of more reliably preventing side tearing of the side seal portion 104, the distance Dw is preferably larger than the distance Dc. 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, The ratio is preferably 4.0 times or less, preferably 1.3 to 8.0 times, more preferably 2.0 to 4.0 times.

Note that whether or not the side seal portion in the inward / outward direction P is more likely to break than the portion G inward from the inner end portion 104c is determined by the following rupture test. it can.
That is, the side seal portion 104 and the neighboring portions on both sides thereof are cut into strips of 30 mm in the longitudinal direction of the diaper and 50 mm in the width direction of the diaper so that the side seal portion 104 is located at the center. Using the Tensilon tensile testing machine (trade name “RTA-100”, manufactured by Orientec Co., Ltd.), the obtained sample was gripped at the front body side end and the back body side end of the sample, and 180 ° Pull in the opposite 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 break position is a part H outside the inner end 104c or a part G inside the inner end 104c. When the number of broken samples is larger than the number of broken samples at the inner portion G, the outer portion H from the inner end portion 104c is more than the inner portion G from the inner end portion 104c. 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 of the inner end 104c , It is determined that it is easier to break than the portion H outside the inner end 104c.
Further, in the disposable diaper of the present embodiment, the thickness of the outer part H from the inner end 104c is larger than the thickness at the inner part G of the inner end 104c in the thickness of the outer body of the front and rear bodies. small. As a result, when tearing the side seal part, it is possible to increase the probability of fracture occurring at or near the fused part 140, and to significantly suppress the possibility of lateral tearing when tearing the side seal part. it can. The thickness at the inner portion G of the front portion and the rear portion at the portion H outside the inner end 104c can be measured in the same manner as the above-described distance Dw, distance Dc, and thickness Tc.

In the diaper 101 of the present embodiment, the outer edge 104d of the fused part 140 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 140 when the diaper 101 is worn can be reduced, and the appearance of the diaper 101 is close to that of underwear. . Furthermore, the touch of the diaper 101 becomes softer by improving the flexibility of the fused part.

In the diaper 101 of the present embodiment, the distance Dw is equal to or greater than the thickness Tc of the fused part 140 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 104c. The cross-sectional area of the side seal portion 104 can be increased, and when the side seal portion 104 is torn, the possibility of breakage in the vicinity of the side seal portion 104 can be further increased. .
From the viewpoint of more reliably preventing the side seal portion 104 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 fusion part 140 and the distance Dc of the fusion part 140 are preferably smaller from the viewpoint of improving the flexibility and feel of the side seal part 104, for example, preferably 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 140 at the central position that divides the distance Dw of the fused part 140 into two equal parts is to measure the thickness corresponding to each of various seal-shaped samples. This is because it can be done.
In addition, the outer edge 104d of the fused part 140 has a shape that is greatly recessed inward in the inner / outer direction P, and a part of the outer edge 104d is inward from the line that bisects the distance Dw of the fused part 140. The thickness Tc of the fused portion includes the thickness of the space portion inside the line that bisects.

The technical elements related to the first invention described above can be combined with the technical elements related to the third invention. By such a combination, the advantageous effect exhibited by the pants-type disposable diaper of the first invention becomes more remarkable.

Specifically, in the first invention described above, the technical element of the third invention can be adopted for the side seal portion 104. For example, the side seal portion 104 of the pant-type disposable diaper 101 of the third invention has the seal edge portion 141 joined by the continuous linear fusion portion 140 as described above. The fusion portion 141 has a distance Dw 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 so that the distance Dw along the inner and outer directions P is fused with the inner end portion. The distance Dc is equal to or greater than the distance Dc along the inner / outer direction P between the facing portion at the outer edge of the wearing portion 140. And in one preferable embodiment of this underpants type disposable diaper 101, in the state before wearing of diaper 101, side seal part 104 is compared with the wearing state of this diaper 101 in the longitudinal direction X of this diaper 101. The diaper 101 extends in a meandering manner along the longitudinal direction X in the wearing state.

The pants-type disposable diaper 101 of the third invention can be suitably manufactured by the same method as the pants-type disposable diaper of the second invention. In the diaper 101 manufactured by this method, the edge A1 of the exterior body 103 in the front body F and the edge B1 of the exterior body 103 in the back body R are arranged in the longitudinal direction of the side seal portion 104 in the side seal portion 104. A seal edge 141 is formed which is joined by an extended continuous linear fusion part 140.
Further, in order to obtain the seal edge 141 (side seal portion 104) having the fused portion 140 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 110C of the diaper continuous body 110. 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 141 thus obtained has a shape in which the outer edge 104d of the fused portion 140 is recessed toward the inside of the diaper 101 in a cross section orthogonal to the direction in which the side seal portion 104 extends when worn. Have. From the viewpoint of promoting the solidification of the molten resin, it is preferable that the diaper continuous body is pressurized by applying a metal member having excellent thermal conductivity to at least one surface, or cooled by an air facility or the like.
Further, in order to obtain the seal edge portion 141 (side seal portion 4) having the fused portion 140 in which the distance Dw is equal to or greater than the distance Dc, it is only necessary to increase the laser intensity, increase the laser output, and perform scanning. It is also preferable to reduce the speed.

In addition, as shown in FIG. 21, the sealing edge 141 in the diaper 101 obtained by the manufacturing method described above leaves the constituent fibers of the exterior body 103 in a fiber shape outside the fused portion 140 in the inner / outer direction P. Has no part. Therefore, the visibility of the fusion | melting part 140 in the wearing condition of the diaper 101 can be reduced, and the external appearance of the diaper 101 becomes a thing close to underwear.

As mentioned above, although this invention was demonstrated based on the preferable embodiment, this invention is not restrict | limited to the said embodiment. For example, in the above-described embodiment, as a preferable manufacturing method of the side seal portion, the fusing by laser light using the apparatus shown in FIG. 6 is given as an example, but the manufacturing method of the side seal portion is not limited to this, and other methods, For example, a heat sealing method, an ultrasonic sealing method, a high frequency sealing method, an adhesive bonding method, or the like may be employed.

Moreover, although the diaper of 1st invention was a thing of the form in which the absorptive main body 5 straddles between the abdominal sheet member 6A and the back sheet member 6B, it replaces with this and the side edge extended to a vertical direction, An exterior sheet having a shape curved inward in the lateral direction in the central area in the longitudinal direction, and an absorbent main body disposed on the inner surface of the exterior sheet, and both side edges of the ventral side portion of the exterior sheet; The first invention may be applied to a pants-type disposable diaper having a pair of side seal parts formed by joining both side edges of the back side part.

Further, the ventral and back

sheet members

6A and 6B are formed by stacking two, three, five or more sheets in addition to the stack of four sheets as shown in FIG. 7 (a). There may be.

Regarding the second and third inventions, the exterior body 103 is not divided into the abdominal part 101A and the dorsal part 101B, as shown in FIG. 17, but the abdominal part 101A, the crotch part 101C, and the dorsal part 101B. However, the exterior body in the second and third inventions is not limited to such a continuous shape. For example, as in the first invention, the outer side of the wearer It is divided into an abdominal sheet member arranged on the (front side) and a back sheet member arranged on the back side (rear side) of the wearer, and the absorbent main body is stretched over and fixed to these two sheet members. May be. 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.

Further, in the second and third inventions, before the polymerization pressurizing step, as shown in FIG. 18, both

side portions

103a and 103a along the conveying direction of the strip-shaped outer package 103, that is, the strip-shaped outer layer sheet 131 is formed. In addition, both side portions along the conveyance direction of each of the belt-like inner layer sheet 132 are folded back so as to cover both longitudinal ends of the absorbent main body 102, but as the belt-like outer layer sheet 131, the width direction is larger than the belt-like inner layer sheet 132. Only the extension portion of the outer layer sheet 131 that extends outward from the side edge of the inner layer sheet 132 when the

sheets

131 and 132 are overlapped is used, with a long length (direction orthogonal to the longitudinal direction). May be folded back so as to cover both longitudinal ends of the absorbent main body 102. In that case, the planned severing portion 110C of the diaper continuous body 110 includes an opening end portion of the waist opening 108 and the vicinity thereof, a six-layer structure portion in which six sheets are stacked, and the other portions are four sheets. Becomes a four-layer structure part. Moreover, the both

side parts

103a and 103a along the conveyance direction of the strip | belt-shaped exterior body 103, ie, the both sides along the conveyance direction of the strip | belt-shaped outer layer sheet 131 and the strip | belt-shaped inner layer sheet | seat 132, do not need to be folded.

Further, in the embodiment of the second invention shown in FIG. 18, the

uneven regions

143 and 143 are formed on both sides of the side seal portion 104, but may be formed only on one side. Further, without the elastic stretchable portion 144 as shown in FIG. 18 outside the uneven region 143, for example, the uneven region 143 has the entire region of the pair of

side seal portions

104, 104 or the side seal portion 104 and absorbability. It may exist over the whole region between the side edges of the main body 102.

Moreover, although the 1st invention thru | or 3rd invention was based on the pants type disposable diaper, these inventions are not restricted to a pants type disposable diaper, Even if it is a pants type wearing article, for example, a pants type sanitary napkin It may be a diaper cover or the like that includes an outer body that forms the outer surface of the worn article but does not include an absorbent main body.

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.

This invention discloses the following underpants type disposable diaper regarding embodiment mentioned above further.
<1>
A pair of sides formed by joining the crotch, the abdominal side and the back side extending from the front and back of the crotch, both side edges of the abdomen, and both side edges of the back side A pants-type disposable diaper comprising a seal portion and having a longitudinal direction corresponding to the front-rear direction of the wearer and a lateral direction perpendicular thereto;
The side seal portion extends linearly along the longitudinal direction of the diaper in a state before the diaper is worn, and in the longitudinal direction of the diaper in the worn state. A pants-type disposable diaper designed to meander and extend along.

<2>
The side seal portion meandering in the wearing state has a meandering width in the lateral direction of preferably 1 mm or more, more preferably 2 mm or more, and preferably 30 mm or less, 20 mm or less. The pants-type disposable diaper according to <1>, which is more preferable.
<3>
The side seal portion has a joint portion extending along the longitudinal direction of the diaper, and there is no non-joint portion outward in the lateral direction of the diaper from the joint portion <1> or <2> The pants-type disposable diaper described in 1.
<4>
A plurality of elastic members extending in the lateral direction of the diaper are arranged in an extended state at intervals in the longitudinal direction of the diaper on both the ventral side and the back side.
At least one of the elastic members in the ventral part and the dorsal part has one end reaching the side seal part or the vicinity thereof,
The position of the end portion in the side seal portion of the elastic member disposed on the ventral side portion and the position of the end portion in the side seal portion of the elastic member disposed on the back side portion are the diapers. The pants-type disposable diaper according to any one of <1> to <3>, which is inconsistent when viewed along the longitudinal direction.
<5>
The elasticity disposed on the back side portion at a position approximately in the middle of the position of the end portions of the side seal portions of the two elastic members adjacent to each other at a distance in the longitudinal direction of the diaper in the ventral side portion. The underpants type disposable diaper as described in <4> in which the edge part in the said side seal part of a member is located.
<6>
The elasticity disposed on the ventral side portion at a position approximately in the middle of the position of the end portions of the side seal portions of the two elastic members adjacent to each other in the longitudinal direction of the diaper at the back side portion. The underpants type disposable diaper as described in <4> or <5> in which the edge part in the said side seal part of a member is located.

<7>
An end portion of the elastic member disposed on the abdominal side portion in the side seal portion and an end portion of the elastic member disposed on the back side portion in the side seal portion are longitudinal directions of the side seal portion. The pants-type disposable diaper according to any one of <4> to <6>, which is alternately positioned along the line.
<8>
The two elastic members adjacent to each other in the longitudinal direction, which are arranged on the ventral side, and the two adjacent ones which are arranged on the dorsal side in the vertical direction. The pants-type disposable diaper according to any one of <4> to <7>, wherein the interval between the elastic members is substantially the same.
<9>
The two elastic members that are adjacent to each other in the longitudinal direction and that are adjacent to each other on the ventral side, and the two that are adjacent to each other that are adjacent to each other in the longitudinal direction that are disposed on the back side. The distance between the elastic members is preferably 2 mm or more, more preferably 4 mm or more, preferably 20 mm or less, and more preferably 15 mm or less. Any one of <4> to <8> The pants-type disposable diaper described in 1.
<10>
The pants-type disposable diaper according to any one of <1> to <9>, wherein the side seal portion is formed by a relatively linear joint portion including a continuous line extending along the longitudinal direction of the diaper.
<11>
The side seal portion is formed by a relatively linear joint portion composed of a continuous line extending along the longitudinal direction of the diaper.
The joint portion preferably has a width of 0.01 mm or more, more preferably 0.1 mm or more, preferably 3 mm or less, and more preferably 2 mm or less <1> to <10. > The underpants type disposable diaper of any one of>.

<12>
The thickness of the side seal part is preferably 0.2 mm or more, more preferably 0.25 mm or more, preferably 2 mm or less, more preferably 1.5 mm or less. Any one of <1> to <11> The pants-type disposable diaper described in 1.
<13>
The position of the end portion in the side seal portion of the elastic member disposed on the ventral side portion and the position of the end portion in the side seal portion of the elastic member disposed on the back side portion are the diapers. When looking along the vertical direction, it almost matches,
The plurality of elastic members disposed on the ventral side portion includes a ventral high elongation stress elastic member having a relatively high elongation stress, and a ventral low elongation stress elastic member having a relatively low elongation stress, The ventral high elongation stress elastic member and the ventral low elongation stress elastic member are alternately arranged along the longitudinal direction of the diaper,
The plurality of elastic members disposed on the back side portion includes a back side high elongation stress elastic member having a relatively high elongation stress and a back side low elongation stress elastic member having a relatively low elongation stress, The back side high elongation stress elastic member and the back side low elongation stress elastic member are alternately arranged along the longitudinal direction of the diaper,
When viewed along the longitudinal direction of the diaper, the position of the ventral high elongation stress elastic member substantially coincides with the position of the dorsal low elongation stress elastic member, and the ventral low elongation stress elastic member The position of the member and the position of the dorsal high elongation stress elastic member are substantially the same,
The abdominal high elongation stress elastic member has a relatively higher elongation stress than the dorsal low elongation stress elastic member, and the dorsal high elongation stress elastic member extends more than the abdominal low elongation stress elastic member. The pants-type disposable diaper according to any one of <1> to <12>, wherein the stress is relatively high.
<14>
The elongation stress of the ventral high elongation stress elastic member and the elongation stress of the dorsal high elongation stress elastic member substantially coincide, and the elongation stress of the ventral low elongation stress elastic member and the dorsal low elongation stress elastic member The pants-type disposable diaper according to <13>, wherein substantially coincides with each other.
<15>
The underpants-type disposable diaper according to <13> or <14>, wherein the extension stress is varied by varying the thickness of the elastic member.
<16>
The pants-type disposable diaper according to <13> or <14>, wherein the extension stress is made different by changing the degree of extension of the elastic member.

<17>
Any one of <1> to <16>, wherein the thickness of the side seal portion is larger than the thickness of the portion adjacent to the side seal portion of each of the ventral side portion and the back side portion constituting the side seal portion. A pants-type disposable diaper according to claim 1.
<18>
A horizontally-long rectangular ventral sheet member disposed on the abdomen of the wearer, a horizontally-long rectangular dorsal sheet member disposed on the back of the wearer, the abdomen sheet member, and the dorsal sheet An absorptive main body fixed over the member,
Any one of <1> to <17> in which a step is provided at an upper portion of the side seal portion by making the position of the upper side of the abdominal seat member different from the position of the upper side of the back seat member Pants-type disposable diapers as described.
<19>
A horizontally-long rectangular ventral sheet member disposed on the abdomen of the wearer, a horizontally-long rectangular dorsal sheet member disposed on the back of the wearer, the abdomen sheet member, and the dorsal sheet An absorptive main body fixed over the member,
Any one of <1> to <17> in which a step is provided at a lower portion of the side seal portion by making the position of the lower side of the ventral seat member different from the position of the lower side of the back seat member Pants-type disposable diapers as described.
<20>
A horizontally-long rectangular ventral sheet member disposed on the abdomen of the wearer, a horizontally-long rectangular dorsal sheet member disposed on the back of the wearer, the abdomen sheet member, and the dorsal sheet An absorptive main body fixed over the member,
The position of the upper side of the abdominal seat member is the same as the position of the upper side of the back seat member, and a notch that is a wedge-shaped cutout is provided on the upper side of the side seal portion. > The underpants type disposable diaper of any one of>.
<21>
A horizontally-long rectangular ventral sheet member disposed on the abdomen of the wearer, a horizontally-long rectangular dorsal sheet member disposed on the back of the wearer, the abdomen sheet member, and the dorsal sheet An absorptive main body fixed over the member,
The position of the lower side of the ventral seat member is the same as the position of the lower side of the back seat member, and a notch that is a wedge-shaped cutout is provided at the lower portion of the side seal portion. > The underpants type disposable diaper of any one of>.

<22>
It further comprises an exterior body that forms the outer surface of the diaper,
The side seal portion is a continuous linear fusion in which an edge portion of the exterior body on the ventral side portion and an edge portion of the exterior body on the back side portion extend in the longitudinal direction of the side seal portion. Has a sealing edge joined at the part,
In the cross section orthogonal to the direction in which the side seal portion extends, the fusion portion has a width W in the inner and outer directions from the side closer to the wearer's skin to the side far from the wearer's skin, and a central position of the width W. When the length in the direction perpendicular to the direction is the thickness T,
The thickness T of the fusion part is equal to or smaller than the total thickness of the exterior body on the ventral side and the exterior body on the back side, and the thickness T of the fusion part is The pants-type disposable diaper according to any one of <1> to <21>, which is larger in thickness than at least one of the exterior body on the ventral side and the exterior body on the back side.

<23>
The pants-type disposable diaper according to <22>, wherein the thickness T of the fusion part is larger than any thickness of the outer body on the abdomen side and the outer body on the back side.
<24>
The pants-type disposable diaper according to <22> or <23>, wherein the width W of the fusion part is smaller than the thickness T of the fusion part.
<25>
The thickness T of the fused part is preferably 100% or less, more preferably 95%, with respect to the total thickness (Ta + Tb) of the abdominal part side exterior body and the back side part exterior body. The pants-type disposable diaper according to any one of <22> to <24>, which is preferably 30% or more, more preferably 50% or more.
<26>
The thickness T of the fused part is preferably a difference (Ta + Tb-T) from the total thickness (Ta + Tb) of the outer body on the abdominal side and the outer body on the back side, preferably 0.00 mm or more, The pants-type disposable diaper according to any one of <22> to <25>, which is preferably 0.02 mm or more, preferably 0.25 mm or less, more preferably 0.20 mm or less.
<27>
The ratio (%) of the thickness T of the fused part to the thickness Ta of the exterior body on the ventral side and the thickness Tb of the exterior body on the back side is preferably 110% or more, more preferably The pants-type disposable diaper according to any one of <22> to <26>, which is 150% or more, preferably 300% or less, more preferably 200% or more.

<28>
The thickness T of the fusion part is preferably a difference (T−Ta, T−Tb) between the thickness Ta of the exterior body on the ventral side and the thickness Tb of the exterior body on the back side. The underpants type according to any one of <22> to <27>, which is 0.05 mm or more, more preferably 0.10 mm or more, preferably 2.00 mm or less, more preferably 1.00 mm or less. Disposable diapers.
<29>
The width W of the fusion part is preferably 95% or less, more preferably 50% or less, and preferably 10% or more, more preferably 30% or more of the thickness T. <22> Thru | or the underpants type disposable diaper any one of <28>.
<30>
The width W of the fused part is preferably 2.0 mm or less, more preferably less than 1.0 mm, and even more preferably less than 0.3 mm, according to any one of <22> to <29>. Pants-type disposable diapers.
<31>
At least one of the exterior body on the abdomen side and the exterior body on the back side is continuous in a cross-sectional shape due to contraction of an elastic member disposed on the exterior body at a portion adjacent to the side seal portion. The underpants according to any one of <22> to <30>, wherein an uneven region deformed into a wave shape is formed, and the thickness T of the fusion part is smaller than the amplitude height of the uneven region in a worn state. Type disposable diaper.
<32>
The pants type according to <31>, wherein the thickness T of the fused part is preferably 70% or less, more preferably 50% or less, and further preferably 20% or less, of the amplitude height of the uneven region. Disposable diapers.

<33>
<22> thru | or <32> a pants type disposable diaper in which the said seal edge does not have the part which the fiber of the exterior body left the fiber shape outside the said melt | fusion part in the said inside / outside direction .
<34>
A waist opening and a pair of leg openings;
The pants-type wearing article according to any one of <22> to <33>, wherein the seal edge is formed over the entire length between the waist opening and the leg opening.
<35>
The pants-type disposable diaper according to any one of <22> to <34>, wherein the width W of the fusion part is less than 0.3 mm, and the thickness T of the fusion part is 0.3 mm or more.

<36>
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 close to the skin of the wearer of the diaper 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 disposable diaper according to any one of <1> to <35>, which is equal to or greater than a distance Dc along the inner / outer direction P between the outer portion and the facing portion at the outer edge of the fused portion.

<37>
The both ends in the thickness direction Q of the fused part are such that the distance Dw for each of the end on the abdomen side and the end on the back side is equal to or greater than the distance Dc. The underpants type disposable diaper as described in <36>.
<38>
The pants-type disposable diaper according to <36> or <37>, wherein the distance Dw is greater than the distance Dc.
<39>
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 <36> to <38>, which is 4.0 times or less, preferably 1.3 to 8.0 times, and more preferably 2.0 to 4.0 times. Pants-type disposable diapers.
<40>
Any one of <36> to <39>, wherein the outer edge of the fused portion has a shape recessed toward the inner side in the inner / outer direction in a cross section orthogonal to the direction in which the side seal portion extends. The pants-type disposable diaper according to 1.
<41>
The pants-type disposable diaper according to any one of <36> to <40>, wherein the distance Dw is equal to or greater than a thickness Tc of the fusion-bonding portion at a central position that bisects the distance Dw.

<42>
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 disposable diaper according to any one of <36> to <41>, which is 30% or less.
<43>
The side seal portion according to any one of <36> to <42>, wherein in the inner and outer directions, a portion outside the inner end portion is more likely to break than a portion located inward from the inner end portion. Pants-type disposable diaper.
<44>
The pants-type disposable diaper according to any one of <36> to <43>, wherein the distance Dw or the distance Dc of the fusion part is preferably 2.0 mm or less, more preferably less than 1.0 mm.
<45>
The distance Dw and the distance Dc of the fused part are each preferably 2.0 mm or less, more preferably less than 1.0 mm, <36> to <44> according to any one of <36> to <44> Diapers.
<46>
The underpants type disposable diaper according to any one of <36> to <45>, wherein the distance Dw is 0.05 mm or more.
<47>
The thickness of the ventral side and the dorsal side is such that, in the inner and outer directions, the thickness of the outer part from the inner end is smaller than the thickness of the inner part from the inner end, <36> to <46> The underpants type disposable diaper of any one of 46>.
<48>
The pants type according to any one of <36> to <47>, wherein the seal edge portion 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. Disposable diapers.

<49>
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 includes 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. Have
In the cross-section orthogonal to the direction in which the side seal portion extends, the fusion portion has a width W in the inner and outer directions from the side closer to the wearer's skin of the wearing article at the center position of the width W. When the length in the direction perpendicular to the direction is the thickness T,
The thickness T of the fusion part is equal to or smaller than the total thickness of the front body side exterior body and the back body side exterior body, and the fusion part thickness T is the front body side exterior body and A pants-type wearing article having a thickness larger than at least one of the outer body on the back body side.

<50>
The pants-type wearing article according to <49>, 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.
<51>
The pants-type wearing article according to <49> or <50>, wherein the width W of the fusion part is smaller than the thickness T of the fusion part.
<52>
The thickness T of the fused part is preferably 100% or less, more preferably 95% or less, with respect to the total thickness (Ta + Tb) of the outer body on the front body side and the outer body on the back body side. The pants-type wearing article according to any one of <49> to <51>, which is preferably 30% or more, more preferably 50% or more.
<53>
The thickness T of the fused portion is preferably a difference (Ta + Tb−T) from the total thickness (Ta + Tb) of the front body side exterior body and the back body side exterior body (Ta + Tb−T), more preferably 0.00 mm or more. The pants-type wearing article according to any one of <49> to <52>, which is 02 mm or more, preferably 0.25 mm or less, more preferably 0.20 mm or less.
<54>
The ratio (%) of the thickness T of the fused portion to the thickness Ta of the outer body on the front body side and the thickness Tb of the outer body on the rear body side is preferably 110% or more, more preferably 150% or more. The pants-type wearing article according to any one of <49> to <53>, which is preferably 300% or less, more preferably 200% or less.

<55>
The thickness T of the fused portion is preferably a difference between the thickness Ta of the outer body on the front body side and the thickness Tb of the outer body on the back body side (T−Ta, T−Tb), preferably 0.05 mm or more. The pants-type wearing article according to any one of <49> to <54>, more preferably 0.10 mm or more, preferably 2.00 mm or less, and more preferably 1.00 mm or less.
<56>
The width W of the fused portion is preferably 95% or less, more preferably 50% or less, and preferably 10% or more, more preferably 30% or more of the thickness T. <49> Thru | or the underpants type wearing article of any one of <55>.
<57>
The width W of the fused part is preferably 2.0 mm or less, more preferably less than 1.0 mm, and even more preferably less than 0.3 mm, according to any one of <49> to <56>. Pants-type wearing article.
<58>
At least one of the outer body on the front body side and the outer body on the rear body side has a cross-sectional shape deformed into a continuous wave shape due to contraction of an elastic member disposed on the exterior body at a portion adjacent to the side seal portion. The pants-type wearing article according to any one of <49> to <57>, wherein an uneven region is formed, and the thickness T of the fused portion is smaller than the amplitude height of the uneven region in a worn state.
<59>
Pants according to <58>, wherein the thickness T of the fused part is preferably 70% or less, more preferably 50% or less, and further preferably 20% or less, of the amplitude height of the uneven region. Mold wearing article.
<60>
The seal edge portion does not have a portion in which the constituent fiber of the exterior body leaves the fiber shape outside the fused portion in the inner and outer directions, and the pants-type wearing article according to any one of <49> to <59> .

<61>
The pants-type wearing article according to any one of <49> to <60>, wherein the seal edge is formed over the entire length between the waist opening and the leg opening.
<62>
The pants-type wearing article according to any one of <49> to <61>, wherein the width W of the fusion part is less than 0.3 mm, and the thickness T of the fusion part is 0.3 mm or more.

<63>
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.
<64>
Both ends in the thickness direction Q of the fusion part are such that the distance Dw for each of the end part on the front body side and the end part on the back body side is not less than the distance Dc. Pants-type wearing article as described.
<65>
The pants-type wearing article according to <63> or <64>, wherein the distance Dw is greater than the distance Dc.
<66>
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 <63> to <65>, which is 4.0 times or less, preferably 1.3 to 8.0 times, and more preferably 2.0 to 4.0 times. Pants-type wearing article.
<67>
Any one of <63> to <66>, wherein the outer edge of the fused portion has a shape recessed toward the inner side in the inner / outer direction in a cross section orthogonal to the direction in which the side seal portion extends. The pants-type wearing article according to 1.
<68>
The pants-type wearing article according to any one of <63> to <67>, 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.
<69>
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 <63> to <68>, which is 30% or less.
<70>
The side seal portion according to any one of <63> to <69>, wherein a portion of the side seal portion that is outward from the inner end portion is more likely to break than a portion that is inward from the inner end portion. Pants-type wearing article.
<71>
The pants-type wearing article according to any one of <63> to <70>, 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.
<72>
The distance Dw and the distance Dc of the fused part 40 are each preferably 2.0 mm or less, more preferably less than 1.0 mm, <63> to <71> according to any one of <71> Goods.
<73>
The pants-type wearing article according to any one of <63> to <72>, wherein the distance Dw is 0.05 mm or more.
<74>
The thicknesses of the front body and the back body are <63> to <73>, 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.
<75>
The pants type according to any one of <63> to <74>, wherein the seal edge portion 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.
<76>
The pants-type wearing article according to any one of <63> to <75>, wherein the pants-type wearing article is a pants-type disposable diaper.

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. 20, a pants-type disposable diaper having the same basic configuration as the diaper 101 shown in FIGS. As an absorbent main body, an absorbent main body of a commercially available pants-type disposable diaper (made by Kao, trade name “Merry's Pants” 2012) is used, and an outer layer sheet 131 and an inner layer sheet 132 constituting the outer body are respectively made of PP. A spunbond nonwoven fabric having a basis weight of 17 g / m ^{2 made} of a single fiber 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 CO ₂ laser was used, the laser output was 24 W, and the scanning speed was 325 mm / 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 the diaper of each Example and a comparative example, the tactile sensation of the side seal part was evaluated by the following method. The results are shown in Table 1 below.

[Feeling of side seal part]
Eight panelists were asked to touch the side seal part of the diaper to be evaluated with their index finger, and the sense at that time was evaluated based on the following evaluation criteria. The average score of 20 panelists was used as the evaluation result for the diaper.

<Evaluation criteria for the feel of the side seal part>
5 points: soft.
4 points: Slightly soft.
3 points: Neither can be said.
2 points: Not soft.
1 point: Not soft.

As is clear from Table 1, the diaper of the example had a soft side seal part and a good touch. On the other hand, in Comparative Examples 1 and 2, the side seal portion is formed by being heated and compressed, so that the thickness T of the side seal portion (fused portion) It was smaller than the thicknesses Ta and Tb of the exterior body of the portion other than the side seal portion of each of the back side portions, resulting in inferior touch feeling of the side seal portion as compared with the example.

[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 280 m / s.

Example 3
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.

[Evaluation]
About each diaper of an Example, the incidence rate of the side tear of a side seal part was evaluated by the following method, respectively. The results are shown in Table 2 below. Moreover, also about the diaper of the comparative examples 1 and 2 mentioned above, the incidence rate of the lateral tear of the side seal part was evaluated by the same method. The results are also shown in Table 2 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 is clear from Table 2, the diaper of the example had a low incidence of side tear at the side seal portion of 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.

According to the first invention, since the side seal portion is deformed so as to meander and extend in the wearing state of the diaper, the side seal portion is easily along the wearer's body, and it is difficult to irritate the wearer's skin. .

According to the second invention, there is provided a pants-type wearing article having an appearance like underwear, having a side seal portion, having a soft side seal portion and excellent touch.

According to the third aspect of 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.

Claims

A pair of side seal parts formed by joining the crotch part, the abdominal side part and the back side part extending from the front and back of the crotch part, and both side edge parts of the abdomen side part and both side edge parts of the back side part A pants-type disposable diaper having a longitudinal direction corresponding to the longitudinal direction of the wearer and a lateral direction perpendicular thereto,
The side seal portion extends linearly along the longitudinal direction of the diaper in a state before the diaper is worn, and in the longitudinal direction of the diaper in the worn state. A pants-type disposable diaper designed to meander and extend along.
The pants-type disposable according to claim 1, wherein a thickness of the side seal portion is larger than a thickness of a portion adjacent to the side seal portion of each of the abdominal side portion and the back side portion constituting the side seal portion. Diapers.
It further comprises an exterior body that forms the outer surface of the diaper,
The side seal portion is a continuous linear fusion in which an edge portion of the exterior body on the ventral side portion and an edge portion of the exterior body on the back side portion extend in the longitudinal direction of the side seal portion. Has a sealing edge joined at the part,
In the cross section orthogonal to the direction in which the side seal portion extends, the fusion portion has a width W in the inner and outer directions from the side closer to the wearer's skin to the side far from the wearer's skin, and a central position of the width W. When the length in the direction perpendicular to the direction is the thickness T,
The thickness T of the fusion part is equal to or smaller than the total thickness of the exterior body on the ventral side and the exterior body on the back side, and the thickness T of the fusion part is The underpants type disposable diaper of Claim 1 or 2 larger than the thickness of at least one of the said exterior body by the side of the said stomach side, and the said exterior body by the side of the said back side.
The pants-type disposable diaper according to claim 3, wherein the thickness T of the fusion part is larger than any thickness of the exterior body on the abdominal side and the exterior body on the back side.
The pants-type disposable diaper according to claim 3 or 4, wherein the width W of the fusion part is smaller than the thickness T of the fusion part.
At least one of the exterior body on the abdominal side and the exterior body on the back side has a cross-sectional shape due to contraction of an elastic member disposed on the exterior body at a portion adjacent to the side seal portion. An uneven region deformed into a continuous wave is formed,
The pants-type disposable diaper according to any one of claims 3 to 5, wherein in the wearing state, the width W of the fusion part is smaller than the amplitude height of the uneven region.
The underpants type according to any one of claims 3 to 6, wherein the seal edge portion does not have a portion in which the constituent fiber of the exterior body leaves a fiber shape outside the fused portion in the inner and outer directions. Disposable diapers.
A waist opening and a pair of leg openings;
The pants-type disposable diaper according to any one of claims 3 to 7, wherein the seal edge is formed over the entire length between the waist opening and the leg opening.
The pants-type disposable diaper according to any one of claims 3 to 8, wherein the width W of the fusion part is less than 0.3 mm, and the thickness T of the fusion part is 0.3 mm or more.
The said side seal part has a junction part extended along the vertical direction of the said diaper, The non-joint part does not exist in the outward of the horizontal direction of this diaper rather than this junction part. A pants-type disposable diaper according to claim 1.
A plurality of elastic members extending in the lateral direction of the diaper are arranged in an extended state at intervals in the longitudinal direction of the diaper on both the ventral side and the back side.
At least one of the elastic members in the ventral part and the dorsal part has one end reaching the side seal part or the vicinity thereof,
The position of the end portion in the side seal portion of the elastic member disposed on the ventral side portion and the position of the end portion in the side seal portion of the elastic member disposed on the back side portion are the diapers. The pants-type disposable diaper according to any one of claims 1 to 10, which is inconsistent when viewed along the vertical direction.
The elasticity disposed on the back side portion at a position approximately in the middle of the position of the end portions of the side seal portions of the two elastic members adjacent to each other at a distance in the longitudinal direction of the diaper in the ventral side portion. The pants-type disposable diaper according to claim 11, wherein an end portion of the side seal portion of the member is located.
The position of the end portion in the side seal portion of the elastic member disposed on the ventral side portion and the position of the end portion in the side seal portion of the elastic member disposed on the back side portion are the diapers. When looking along the vertical direction, it almost matches,
The plurality of elastic members disposed on the ventral side portion includes a ventral high elongation stress elastic member having a relatively high elongation stress, and a ventral low elongation stress elastic member having a relatively low elongation stress, The ventral high elongation stress elastic member and the ventral low elongation stress elastic member are alternately arranged along the longitudinal direction of the diaper,
The plurality of elastic members disposed on the back side portion includes a back side high elongation stress elastic member having a relatively high elongation stress and a back side low elongation stress elastic member having a relatively low elongation stress, The back side high elongation stress elastic member and the back side low elongation stress elastic member are alternately arranged along the longitudinal direction of the diaper,
When viewed along the longitudinal direction of the diaper, the position of the ventral high elongation stress elastic member substantially coincides with the position of the dorsal low elongation stress elastic member, and the ventral low elongation stress elastic member The position of the member and the position of the dorsal high elongation stress elastic member are substantially the same,
The abdominal high elongation stress elastic member has a relatively higher elongation stress than the dorsal low elongation stress elastic member, and the dorsal high elongation stress elastic member extends more than the abdominal low elongation stress elastic member. The pants-type disposable diaper according to any one of claims 1 to 11, wherein the stress is relatively high.
The elongation stress of the ventral high elongation stress elastic member and the elongation stress of the dorsal high elongation stress elastic member substantially coincide, and the elongation stress of the ventral low elongation stress elastic member and the dorsal low elongation stress elastic member The pants-type disposable diaper according to claim 13, which are substantially matched.
The pants-type disposable diaper according to claim 13 or 14, wherein the elongation stress is varied by varying the thickness of the elastic member.
The pants-type disposable diaper according to claim 13 or 14, wherein the elongation stress is varied by varying the degree of elongation of the elastic member.
It further comprises an exterior body that forms the outer surface of the diaper,
The side seal portion is a continuous linear fusion in which an edge portion of the exterior body on the ventral side portion and an edge portion of the exterior body on the back side portion extend in the longitudinal direction of the side seal portion. Has a sealing edge joined at the part,
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 close to the skin of the wearer of the diaper 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 disposable diaper as described in any one of Claims 1 thru | or 16 which is more than the distance Dc along the inner / outer direction P between the part and the opposing site | part in the outer edge of this melt | fusion part.
The pants-type disposable diaper according to claim 17, wherein the distance Dw is larger than the distance Dc.
19. The pant mold according to claim 17, wherein the outer edge of the fusion part has a shape recessed toward the inner side in the inner and outer directions in a cross section perpendicular to the direction in which the side seal part extends. Disposable diapers.
The pants-type disposable diaper according to any one of claims 17 to 19, 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.
21. The pants according to any one of claims 17 to 20, wherein the side seal portion is more easily ruptured in the inner / outer direction than an inner portion of the inner end portion. Type disposable diaper.
The thicknesses of the abdomen and the dorsal side are such that, in the inside and outside direction, the thickness of the part outside the inner end is smaller than the thickness of the part inside the inner end. The underpants type disposable diaper as described in any one of these.
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 includes 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. Have
In the cross-section orthogonal to the direction in which the side seal portion extends, the fusion portion has a width W in the inner and outer directions from the side closer to the wearer's skin of the wearing article at the center position of the width W. When the length in the direction perpendicular to the direction 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. And a pants-type disposable diaper that is larger in thickness than at least one of the outer body on the back body side.
The pants-type disposable diaper according to claim 23, wherein the thickness T of the fused part is larger than any thickness of the outer body on the front body side and the outer body on the rear body side.
The pants-type disposable diaper according to claim 23 or 24, wherein the width W of the fusion part is smaller than the thickness T of the fusion part.
At least one of the outer body on the front body side and the outer body on the rear body side has an unevenness in which the cross-sectional shape is deformed into a continuous wave due to the contraction of the elastic member disposed on the exterior body at a portion adjacent to the side seal portion. The pants-type disposable diaper according to any one of claims 23 to 25, wherein a region is formed, and the width W of the fused portion is smaller than the amplitude height of the uneven region in a worn state.
The pants-type disposable according to any one of claims 23 to 26, wherein the seal edge portion does not have a portion where the constituent fibers of the exterior body leave a fiber shape outside the fused portion in the inner and outer directions. Diapers.
The pants-type disposable diaper according to any one of claims 23 to 27, wherein the seal edge is formed over the entire length between the waist opening and the leg opening.
The pants-type disposable diaper according to any one of claims 23 to 28, wherein the width W of the fusion part is less than 0.3 mm and the thickness T of the fusion part is 0.3 mm or more.