TW201511744A - Underpants-type disposable nappy - Google Patents

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 diaper

The present invention relates to a pant type disposable diaper.

Previously, as a pant-type disposable diaper, it is generally used to include a lower portion including a absorbent body and a ventral side portion and a back side portion extending from the lower portion of the crotch to the ventral side and the back side of the wearer, respectively, and joined by A pair of side seal portions, a waist opening portion, and a pair of leg opening portions are formed on the left and right side edges of the front belly side and the left and right side edges of the back side portion. In such a pant-type disposable diaper, the side seal portion extends linearly in the longitudinal direction of the diaper. The linear shape does not change before and after wearing the diaper.

However, there is a case where, if the side seal portion linearly extends in the longitudinal direction of the diaper in the wearing state of the diaper, the side seal portion and the portion in the vicinity thereof are hard to be properly applied to the wearer's body. In particular, when the front side portion and the back side portion are heat-sealed discontinuously to form a side seal portion, the hard portion formed by heat sealing tends to cause irritation to the wearer's skin.

In order to reduce the contact of the side seal portion with the skin, Patent Document 1 describes that the side edge of the side seal portion in the width direction is wavy. However, even with this configuration, since the shape of the side seal portion in the worn state of the diaper is linear, it is easy to cause irritation to the wearer's skin.

In addition, a plurality of elastic members extending in the lateral direction are usually disposed in the waist portion of the diaper, and in this case, the end portions of the elastic members reach the side seal portions. Further, in order to prevent the so-called "off-line" of the elastic member, it is necessary to join the side seal portion more firmly. Side seal The part becomes harder and more irritating to the wearer's skin. In the configuration of the elastic member of the waist portion, Patent Document 2 describes that the entire width W1 of the elastic thread from the uppermost end of the waist portion of the diaper to the waist portion of the diaper is applied to the lowermost end of the pleat. The elastic line from the uppermost end of the waist provided on the back side of the diaper is wider than the full width W2 of the lowermost elastic line, and the elastic line of the uppermost end of the back side is the most ventral side. The elastic line at the upper end is disposed on the upper side. However, this configuration is not intended to prevent the side seal from irritating the skin in order to prevent the back side portion or the lower part of the lower portion from being worn under the wearing state of the diaper.

Patent Document 3 describes a pant-type disposable diaper having a side seal portion having 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 thus the appearance before wearing is unattractive, and the diaper is not easily stretched when the diaper is worn.

In the process of the pant type disposable diaper, the side seal portion is generally formed using a hot rolling device. As another joining method, a method of using ultrasonic welding (for example, Patent Document 4) and a method of using laser light (for example, Patent Document 5) are also known. In addition, the method of manufacturing an absorbent article is not limited to the method of producing an absorbent article, and Patent Document 6 discloses that the laminated body of the sheet is irradiated with laser light, and the fusion portion in which the sheet laminated body is fused between the sheets is fused. Ministry trip.

Pants-type disposable diapers are usually manufactured by the following steps. That is, it is manufactured by manufacturing a diaper continuous body in which a plurality of diapers such as a diaper continuous body as shown by reference numeral 110 in Fig. 20 are connected in one direction (transport direction), and a joining device by a hot rolling device or the like In the diaper continuous body, the front side seal forming portion is overlapped with each other before the body side outer casing is joined to the back body side outer casing, and then the joint portion is cut by a cutting device such as a cutter to be divided into Each diaper. The trouser-type disposable diaper thus manufactured (the cut edge portion of the joint portion by the cutting of the cutting device) is worn on the diaper, and the left and right side edges and the back body piece of the front body piece The left and right sides are overlapped in a palm shape The shape protrudes from the outer surface of the diaper.

The pant-type disposable diaper tears the side seal portion in the longitudinal direction when it is taken off for the purpose of disposal. However, in the conventional pant-type disposable diaper, since the side seal portion is formed by the above method, the crack of the sheet progresses in the lateral direction while the side seal portion is torn in the longitudinal direction, and the sheet is The crack reaches the inner side of the diaper or reaches the side edge of the diaper. If such a transverse crack occurs, it is difficult to smoothly tear the side seal portion in the longitudinal direction of the diaper. For example, the user must re-apply the tearing of the side seal portion in the longitudinal direction again, and it takes time to break the side seal portion. As a technique for preventing such a transverse crack, a method of forming a pattern formed in a fusion portion of a side seal portion or a method of forming a second joint portion extending in the vertical direction in parallel with the side seal portion has been proposed (see Patent Document 7). ).

[Previous Technical Literature] [Patent Literature]

[Patent Document 1] Japanese Patent Laid-Open Publication No. 2012-70917

[Patent Document 2] Japanese Patent Laid-Open No. Hei 9-271488

[Patent Document 3] Japanese Patent Laid-Open Publication No. 2004-73885

[Patent Document 4] Japanese Patent Laid-Open Publication No. 2006-82556

[Patent Document 5] Japanese Patent Laid-Open Publication No. 2010-188629

[Patent Document 6] Japanese Patent Laid-Open Publication No. 2012-126130

[Patent Document 7] Japanese Patent Laid-Open Publication No. 2000-14697

In recent years, pants-type disposable diapers have been expected to have the same appearance as ordinary underwear. However, the pant-type disposable diaper has a side seal portion which is not present in the general underwear, and as a result, the front side seal portion protrudes more toward the outer side of the diaper than the peripheral portion, and the appearance of the diaper is very conspicuous, so the current situation is difficult to say. The pant-type disposable diaper has the same appearance as the underpants.

Further, as a method of imparting the same appearance to a pant type disposable diaper as a general underwear, a method of cutting a device by a cutter or the like, using a hot rolling device, or the like is considered. The front end portion of the previous side seal portion formed by the conventional method, such as ultrasonic welding described in the above Patent Document 5, is physically cut, whereby the protruding height of the side seal portion from the outer surface of the diaper is lowered. However, the side seal portion formed according to the conventional method is formed by compressing the outer casing system in the thickness direction, so that the thickness (width) of the fusion portion of the material forming the side seal portion is relatively small, and it is easy to become the outer surface of the diaper. The other parts are harder, so the hardness is felt when the hand touches the outer surface of the diaper. The touch of the side seal portion also becomes the main reason for distinguishing between the pants type disposable diaper and the ordinary underwear.

Further, in the case of the method of providing the second joining portion extending in the vertical direction in parallel with the side seal portion described in Patent Document 7, it is difficult to make the diaper look like a pant.

The present invention provides a pant-type disposable diaper comprising a crotch portion, a front side portion and a back side portion extending from the lower portion of the crotch portion, and a side edge portion and a back side portion respectively joining the front side portion The two side edges are formed as a pair of side seal portions, and have a longitudinal direction corresponding to the front and rear directions of the wearer and a transverse direction orthogonal thereto.

The side seal portion extends straight along the longitudinal direction of the diaper in a state in which the diaper is worn before the diaper is worn, and extends in the longitudinal direction of the diaper in a worn state (hereinafter referred to as "the first "Invention" means the invention).

Moreover, the present invention provides a pants-type wearing article comprising an outer surface of the outer surface of the wearing article, and the two side edges of the outer body of the front body piece and the outer edge portions of the outer body of the back body piece A pair of side seal portions, a waist opening portion, and a pair of leg opening portions are formed.

The side seal portion has a sealing edge portion which is formed by using a continuous linear fusing portion extending along the longitudinal direction of the side seal portion to seal the edge portion of the outer body of the front piece and the back body piece The edge of the body is combined.

The fusion portion has a width W in a cross section perpendicular to a direction from the wearer's skin toward the side of the wearer's skin in a cross section perpendicular to a direction in which the side seal portion extends, and the width is set to a width W The direction of the center of W that is orthogonal to this direction When the length is set to the thickness T, The thickness T of the fusion portion is smaller than the total thickness (Ta+Tb) of the outer body and the back body side outer body, and the thickness T of the fusion portion is larger than the front body side outer body and the back body side. The thickness of at least one of the outer casings (Ta or Tb) (hereinafter referred to as "the second invention" means the invention).

Further, the present invention provides a pants-type wearing article, which comprises forming a body outside the outer surface of the wearing article, and joining the two side edges of the outer body of the front body piece and the two side edges of the outer body of the back body piece a pair of side seal portions, a waist opening portion, and a pair of leg portion openings, wherein the side seal portion includes a seal edge portion that is continuous in a line shape extending along a longitudinal direction of the side seal portion The fusion portion is formed by combining an edge portion of the outer body of the front body piece with an edge portion of the outer body of the back body piece, and the fusion portion is formed on a cross section orthogonal to a direction in which the side seal portion extends. The direction in which the side of the wearer's skin close to the wearer's skin faces the side of the wearer's skin is the inner-outer direction P, and when the direction orthogonal to the inner-outer direction P is the thickness direction Q, both ends of the thickness direction Q and the The distance Dw between the end portions and the inner end portion of the wearer's skin in the inner and outer directions is a distance Dc between the inner end portion and the opposite portion of the outer edge of the fusion portion in the inner and outer directions P. (In the following, the "third invention" means the invention).

1‧‧‧ diapers

2‧‧‧Front sheet

3‧‧‧Back sheet

4‧‧‧Acceptor

5‧‧‧Absorbing ontology

5a‧‧‧End of the absorbent body

5b‧‧‧End of the absorbent body

5c‧‧‧Side of the absorptive body

6a‧‧‧ Side edge of the ventral sheet member

6b‧‧‧ Side edge of the back side sheet member

6A‧‧‧ Ventral sheet member

6B‧‧‧ Back side sheet member

7‧‧‧Three-dimensional folds

7a‧‧‧1st three-dimensional fold

7b‧‧‧2nd pleat fold

61‧‧‧ outer sheet

61L‧‧‧Exit area

62‧‧‧ Inner sheet

70‧‧‧Three-dimensional pleat forming sheet

71‧‧‧Flexible components

80a‧‧‧Flexible components

80b‧‧‧Flexible components

81a‧‧‧The first elastic part of the ventral side

81b‧‧‧The first elastic part of the back side

82a‧‧‧2nd part of the ventral side elastic member

82b‧‧‧The second side elastic member of the back side

101‧‧‧Pants type disposable diapers

101A‧‧‧ ventral side

101B‧‧‧ Back side

101C‧‧‧胯 lower part

102‧‧‧Absorbable ontology

103‧‧‧Outer body

103a‧‧‧ side

104‧‧‧Side seal

104a‧‧‧End

104b‧‧‧End

104c‧‧‧Inside end

104d‧‧‧Outer edge

104d'‧‧‧ opposite parts

104e‧‧‧Borders

105‧‧‧Lumbar elastic members

106‧‧‧After waist elastic members

107‧‧‧ Leg elastic members

108‧‧‧Low opening

109‧‧‧ leg opening

110‧‧‧ diaper continuum

110a‧‧‧One side of diaper continuum

110b‧‧‧The other side of the diaper continuum

110C‧‧‧Scheduled part

111‧‧‧ nip rollers

112‧‧‧protrusion roller

113‧‧‧Support roller

120‧‧‧Laser type fuse

121‧‧‧Support components

122‧‧‧ frame

123‧‧‧Cylinder roller

124‧‧‧pressure belt

125a‧‧‧roll

125b‧‧‧roll

125c‧‧·roll

126‧‧‧ Belt type pressurizing device

127‧‧‧ openings

130‧‧‧Laser light

131‧‧‧ outer sheet

132‧‧‧Inner sheet

133‧‧‧ joints

135‧‧‧Enhanced head

140‧‧‧Fuse Department

141‧‧‧ Sealing edge

142‧‧‧ 襞

143‧‧‧ concave and convex area

144‧‧‧Flexible expansion and contraction

A‧‧‧ ventral side

A1‧‧‧lateral edge

B‧‧‧Back side

B1‧‧‧lateral edge

C‧‧‧胯下下

CL‧‧‧ vertical center line

Dc‧‧‧ distance

Dw‧‧‧Distance

D1‧‧ ‧ step

D2‧‧ ‧ step

F‧‧‧Predecessor

G‧‧‧ parts

H‧‧‧ parts

La‧‧ ‧ interval

Lb‧‧‧ interval

LO‧‧‧ leg opening

LO'‧‧‧ leg hole

N1‧‧‧ notch

N2‧‧‧ notch

P‧‧‧Inside and outside directions

Q‧‧‧ Thickness direction

R‧‧‧Back body

S‧‧‧Side seal

T‧‧‧ thickness

Ta‧‧ thickness

Tb‧‧‧ thickness

Tc‧‧‧ thickness

T1‧‧‧ thickness

T2‧‧‧ thickness

W‧‧‧Width

WO‧‧‧Low opening

X‧‧‧ portrait

Y‧‧‧ horizontal

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a perspective view showing a wearing state of an embodiment of a pant type disposable diaper according to the present invention.

Fig. 2 is a developed plan view showing a state in which the pants-type disposable diaper shown in Fig. 1 is unfolded from the front sheet side.

Figure 3 is a cross-sectional view taken along the line X1-X1 in Figure 2.

Fig. 4 is a schematic view showing a side seal portion and a vicinity thereof in a state before wearing the diaper shown in Fig. 1.

Figure 5 is a side view showing the side seal portion of the diaper shown in Figure 1 and its vicinity Schematic diagram.

Fig. 6 is a perspective view showing a device which is preferably used to form the side seal portion of the diaper shown in Fig. 1.

7(a) to 7(c) are explanatory views each showing a state in which a side seal portion is formed while dividing a diaper continuous body using the apparatus shown in Fig. 6.

Fig. 8 is a view showing another example of a method of manufacturing a pant-type disposable diaper using the apparatus shown in Fig. 6 (corresponding to Fig. 7(c)).

Fig. 9 is a view schematically showing a transverse cross section of the diaper shown in Fig. 1.

Fig. 10 is a schematic view showing a side seal portion and a vicinity thereof in a state before wearing in another embodiment of the diaper according to the present invention (Fig. 4).

Fig. 11 is a schematic view (corresponding to Fig. 5) showing a side seal portion in a worn state and a vicinity thereof in another embodiment of the diaper according to the present invention.

Fig. 12 is a schematic view showing a side seal portion and a vicinity thereof in a state before wearing in a still further embodiment of the diaper according to the present invention (corresponding to Fig. 4).

Fig. 13 is a schematic view (corresponding to Fig. 5) showing a side seal portion in a worn state and a vicinity thereof in still another embodiment of the diaper according to the present invention.

Fig. 14 is a perspective view schematically showing an embodiment of a pant type disposable diaper according to a second aspect of the invention.

Fig. 15 is a cross-sectional view schematically showing a cross section taken along line I-I of Fig. 14.

Fig. 16 is a plan view schematically showing the unfolded and stretched state of the diaper shown in Fig. 14.

Fig. 17 is a cross-sectional view showing a cross section of the side seal portion of the diaper shown in Fig. 14 and its vicinity in a direction orthogonal to the direction in which the side seal portion extends.

Fig. 18 (a) is a schematic side view showing a side portion of the diaper shown in Fig. 14, and Fig. 18 (b) is a sectional view taken along line II-II of Fig. 18 (a).

Figure 19 (a) is a model for explaining the method of measuring the amplitude height in an approximate wearing state. Fig. 19(b) is an enlarged view of the circle in Fig. 19(a).

Fig. 20 is a perspective view schematically showing the process of the diaper continuous body in the manufacture of the diaper shown in Fig. 14.

Fig. 21 is a cross-sectional view showing a cross section of a side seal portion of the pant-type disposable diaper according to the third aspect of the invention and a vicinity thereof in a direction orthogonal to a direction in which the side seal portion extends.

Hereinafter, the present invention will be described based on preferred embodiments thereof with reference to the drawings. Fig. 1 shows an embodiment of the pant type disposable diaper of the first invention. The diaper 1 shown in the figure is a so-called front and rear split type pants type disposable diaper. The diaper 1 has a longitudinal direction X corresponding to the front and rear directions of the wearer and a transverse direction Y orthogonal thereto. The diaper 1 includes a liquid-permeable front sheet 2, a liquid-impermeable back sheet 3, and an absorber 4 in which the sheets are disposed. Further, the diaper 1 has a crotch portion C and a front side portion A and a back side portion B which are extended from the crotch portion C to the front and rear of the wearer.

Specifically, as shown in FIGS. 1 and 2 , the diaper 1 includes a front side sheet member 6A that is disposed on the front side of the wearer and has a horizontally long rectangular shape, and a back side sheet member 6B that is disposed on the back side sheet member 6B. a rear side of the wearer and having a rectangular shape; the absorbent body 5 is erected and fixed to the front side sheet member 6A and the back side sheet member 6B; and the three-dimensional gathers 7 are disposed on the absorbent body 5 Each of the side portions 5c, 5c. In the diaper 1, the side seal portion S is formed by joining the both side edge portions 6a and 6a of the front side sheet member 6A and the both side edge portions 6b and 6b of the back side sheet member 6B. By forming the side seal portion S, the waist opening portion WO and the pair of leg opening portions LO, LO are formed in the diaper 1. As shown in FIGS. 1 and 2, the diaper 1 is formed to be bilaterally symmetrical with respect to a longitudinal center line CL extending in the longitudinal direction X.

As shown in FIG. 2 and FIG. 3, the absorbent body 5 has a liquid-permeable front sheet 2, a liquid-impermeable or water-repellent back sheet 3, and a liquid disposed between the two sheets 2 and 3. Retaining absorbent body 4. As shown in FIG. 2, the absorbent body 5 is formed in a rectangular shape which is long in the longitudinal direction X. The absorber 4 is also formed into a rectangular shape that is long in the longitudinal direction X.

The front sheet 2, the back sheet 3, and the absorbent body 4 can be used in the same manner as those previously used for such an absorbent article without any particular limitation. For example, as the front sheet 2, a hydrophilic nonwoven fabric or a hydrophilic perforated resin film or the like can be used. As the back sheet 3, a resin film or a laminate having a water-repellent non-woven fabric can be used. As the absorber 4, a fiber bundle of fluff pulp, a mixed fiber stack of fluff pulp and a superabsorbent polymer, or an absorbent sheet obtained by holding a superabsorbent polymer in a pulp sheet can be used. .

In the absorbent body 5, a region on the one end portion 5a side in the longitudinal direction X is fixed to the front side sheet member 6A via an adhesive, and a region on the other end portion 5b side in the longitudinal direction X is fixed to the back side sheet member 6B via an adhesive. .

In the present specification, the longitudinal X-shape is aligned with the longitudinal direction of the diaper 1 or its constituent member, that is, the longitudinal direction of the absorbent body 5, and the transverse direction Y is the same as the width direction of the diaper 1 or its constituent member, that is, the absorbent body 5. .

An elastic member (not shown) extending in the lateral direction Y of the diaper 1 as shown in FIG. 2 is spaced apart from the front side sheet member 6A and the back side sheet 6B in the longitudinal direction X of the diaper 1 and is elongated. There are multiple lines under the configuration. In detail, as shown in FIGS. 2 and 3, the front side sheet member 6A and the back side sheet member 6B each include: an outer layer sheet 61 which forms an outer surface of the diaper 1; and an inner layer sheet 62 which is disposed On the inner surface side of the outer layer sheet 61, and a plurality of elastic members (not shown) which are located between the two sheets 61 and 62 and are elongated in the width direction Y.

The outer sheet 61 of the diaper 1 has a length which is further extended in the longitudinal direction X from a region in which a plurality of elastic members (not shown) are sandwiched and fixed by the outer sheet 61 and the inner sheet 62, and the outer sheet is stretched. The extended portion 61L (see FIG. 2) of the material 61 which is extended from the inner layer sheet 62 is folded back to the side of the absorbent body 5, and covers the end portions 5a, 5b of the longitudinal direction X of the absorbent body 5. The folded-back extension region 61L is followed by the inner layer sheet 62 by, for example, an adhesive (not shown).

Three-dimensional pleats 7 are disposed on both side portions 5c and 5c of the absorbent body 5, respectively. Figure 2 and As shown in Fig. 3, the three-dimensional gather 7 has a first three-dimensional gather 7a extending from the side portion 5c of the absorbent body 5 toward the inner side in the width direction Y, and a second three-dimensional gather 7b on the side of the self-absorbent body 5 The portion 5c extends toward the outer side in the width direction X. Each of the first three-dimensional pleats 7a and the second three-dimensional pleats 7b is formed of a three-dimensional pleat-forming sheet 70 and a plurality of elastic members 71 that are disposed in an extended state in the longitudinal direction X of the three-dimensional pleat-forming sheet 70.

Fig. 4 schematically shows the side seal portion S in the state before wearing the diaper 1 and its vicinity. The side seal portion S is in a state before wearing the diaper 1, and extends relatively straight along the longitudinal direction X of the diaper 1 in comparison with the wearing state of the diaper 1. The term "relatively extending in a straight line" refers to an extended state of the side seal portion S in a state in which the diaper 1 is worn, and the stretched state of the side seal portion S in a state before wearing the diaper 1 is relatively closer to a straight line. Therefore, in the state before wearing the diaper 1, the side seal portion S need not be completely straight, and the side seal portion S is allowed to slightly exhibit a wave shape. Regarding the front side sheet member 6A and the back side sheet member 6B constituting the side seal portion S, the positions of the upper sides thereof are identical, and the positions of the lower sides thereof are also identical.

On the other hand, in Fig. 5, the side seal portion S in the wearing state of the diaper 1 and its vicinity are schematically shown. In the wearing state of the diaper 1, as shown in the figure, the tensile force F acts toward the lateral direction Y of the diaper 1. Further, in the wearing state of the diaper 1, the relatively straight side seal portion S before being worn is deformed by the action of the tensile force F, and extends in the longitudinal direction of the diaper 1. By the side seal portion S 蜿蜒 extending, in the diaper 1, the side seal portion S and its vicinity become easy to follow the wearer's body, and the stimulation of the wearer's skin caused by the side seal portion S is reduced.

In view of the fact that the above-described effects are more remarkable, the width W (see FIG. 5) in the lateral direction Y of the side seal portion S in the wearing state of the diaper 1 is preferably 1 mm or more, and more preferably 2mm or more. Further, it is preferably 30 mm or less, and more preferably 20 mm or less. For example, the width W of the crucible is preferably 1 mm or more and 30 mm or less, and more preferably 2 mm or more and 20 mm or less.

In order to make the side seal portion S relatively straight before wearing, and in a wearable state The side seal portion S is deformed in a meandering manner. In the present embodiment, the arrangement state of the elastic members located in the waist portions of the front side sheet member 6A and the back side sheet member 6B is examined. The details are as follows. In the front side sheet member 6A, the back side elastic members 80a extending in the lateral direction Y of the diaper 1 are spaced apart from each other in the longitudinal direction X of the diaper 1, and a plurality of strips are disposed in an extended state. Similarly, in the back side sheet member 6B, the back side elastic members 80b extending in the lateral direction Y of the diaper 1 are also spaced apart from each other in the longitudinal direction X of the diaper 1, and a plurality of strips are disposed in an extended state. The back side elastic members 80a are spaced apart in the longitudinal direction X and the two adjacent intervals La are equally spaced. Similarly, the back side elastic members 80b are spaced apart in the longitudinal direction X and the two adjacent intervals Lb are also equally spaced. La and Lb may be the same or different.

When the diaper 1 is viewed as shown in FIG. 2, the back side elastic member 80a and the back side elastic member 80b are not arrange|positioned in the area|region which the abdominal sheet member 6A and the back side sheet member 6B overlap with the absorptive main body 5. Therefore, in the vicinity of the waist opening portion WO of the back side elastic member 80a and the back side elastic member 80b, the one side seal portion S and the other side seal portion S extend, and the front side is away from the waist opening portion WO. The position extends only between the side seal portion S and the side edge portion of the absorbent body 5. As described above, the back side elastic member 80a and the back side elastic member 80b include two types of extending regions, but at least one of the end portions of the elastic members 80a and 80b reaches the side seal portion S or its vicinity. Here, the vicinity refers to a range in which the distance from the side seal portion S to the lateral direction Y is within 3 mm.

If attention is paid to the positions of the end portions of the front side elastic portion 80a and the back side elastic member 80b to the side seal portion S, as shown in Fig. 4, when viewed in the longitudinal direction X of the diaper 1, the front side elastic member 80a is on the side. The position of the end portion of the sealing portion S does not coincide with the position of the end portion of the back side elastic member 80b at the side seal portion S. In this case, it is not necessary for the positions of the end portions of the front side elastic members 80a to the side seal portions S to be inconsistent with the positions of the end portions of the back side elastic members 80b at the side seal portions S, as long as they are capable of If the positions of the diapers 1 are not uniform, the degree of deformation of the side seal portions S in a state in which the diaper 1 is worn is not uniform. The term "inconsistent" means, for example, the end portion of the abdominal elastic member 80a and the back side elastic member 80b located closest to it. The distance between the ends in the longitudinal direction X is 1 mm or more.

In the present embodiment, the end portion of the back side elastic member 80b at the side seal portion S is located in the front side portion A in the longitudinal direction X of the diaper 1 with the interval La and the adjacent two abdominal elastic members 80a. At a substantially intermediate position of the position of the end of the side seal. Vice versa, the end portion of the front side elastic member 80a at the side seal portion S is located in the back side portion B in the longitudinal direction X of the diaper 1 with an interval Lb adjacent to the two back side elastic members 80b. A substantially intermediate position of the position of the end of the side seal. As described above, in the present embodiment, when the side seal portion S in the diaper 1 before wearing is viewed in the longitudinal direction X, the end portion of the front side elastic portion 80a and the back side elastic member 80b are formed in the side seal portion. The ends alternately exist. The term "substantially intermediate position" refers not only to the position in the middle, but also to the deviation within the range of ± 5% of the position in the middle.

The arrangement state of the waist elastic members 80a and 80b disposed on the front side sheet member 6A and the back side sheet member 6B is as described above, whereby the diaper 1 is worn, and the tensile force F is applied to the waist portion elastic member. 80a and 80b act in the lateral direction Y, whereby the end portions of the waist elastic members 80a and 80b are pulled toward the longitudinal center line CL of the diaper 1. Specifically, the front side elastic member 80a is pulled toward the longitudinal center line CL of the front side sheet member 6A at the end portion of the side seal portion S. On the other hand, regarding the back side elastic member 80b, the end portion of the side seal portion S is pulled toward the longitudinal center line CL of the back side sheet member 6B. Further, the end portion of the front side elastic portion 80a and the end portion of the back side elastic member 80b at the side seal portion are alternately present in the longitudinal direction X of the side seal portion S, so that the side seal is as shown in FIG. The portion S is deformed in a wave shape in the longitudinal direction X.

As is apparent from the above description, in order to deform the side portion S蜿蜒 in the wearing state of the diaper 1, it is preferable that the two adjacent side elastic members 80a are spaced apart from each other in the longitudinal direction X. La is substantially the same as the interval Lb of the two back side elastic members 80b which are spaced apart from each other in the longitudinal direction X. In this case, from the viewpoint of effectively forming the side seal portion S, the intervals La and Lb are preferably 2 mm or more, and more preferably 4 mm or more. Further, it is preferably 20 mm or less, and more preferably 15 mm or less. For example, the interval La and Lb are preferably 2 mm. The above is 20 mm or less, and more preferably 4 mm or more and 15 mm or less. The term "substantially the same" means that the difference between the intervals La and Lb is within 2 mm.

The diaper 1 having the above configuration is preferably produced by the following method. In other words, the outer layer sheet 61 and the inner layer sheet 62 are prepared so that the plurality of sheets of the front side elastic members 80a extend in the same direction between the sheets, and the space La is formed between the elastic members 80a. Configured and fixed in the extended state. Thereby, the abdominal sheet member 6A is obtained. Similarly, the outer layer sheet 61 and the inner layer sheet 62 are prepared such that a plurality of back side elastic members 80b extend in the same direction between the two sheets, and a space Lb is formed between the elastic members 80b. It is placed and fixed in the extended state. Thereby, the back side sheet member 6B is obtained. Each of the sheet members 6A and 6B obtained in this manner is placed in parallel and spaced apart in such a manner that the longitudinal direction thereof is oriented in the same direction, and the absorbent body 5 is disposed so as to span the two sheet members 6A and 6B. Bonded to the sheet members 6A, 6B. Next, the inner surfaces of the both side edges 6a, 6a of the front side sheet member 6A and the inner surfaces of the side edge portions 6b, 6b of the back side sheet member 6B are overlapped with each other in the palm shape, along the longitudinal direction X of the diaper 1. Join the overlapping parts. Further, when overlapping in the palm shape, the position of the end portion of the front side elastic member 80a to the side seal portion and the position of the end portion of the back side elastic member 80b to the side seal portion S when viewed in the longitudinal direction X of the diaper 1 Inconsistent ways to adjust the overlap position. In particular, when the interval sheets La and Lb are the same, when the front side sheet member 6A and the back side sheet member 6B are overlapped in a palm shape, the positions of the two sheet members 6A, 6B are shifted by an interval La in the longitudinal direction X. One-half distance (Lb). By this operation, the diaper 1 having the side seal portion S which is smoothly deformed and twisted can be manufactured.

The side seal portion S may be formed by a joint portion including a continuous line extending in the longitudinal direction X of the diaper 1, or may be formed of an aggregate of a plurality of discontinuous joint lines. The side seal portion S is preferably formed of a linear joint portion including a continuous line extending in the longitudinal direction X of the diaper 1 from the viewpoint of forming the side seal portion S which is a smooth waveform.

Further, from the viewpoint of smoothly forming the side seal portion S in which the smooth waveform is drawn, it is preferable that the side seal portion S has no outer side in the lateral direction Y as compared with the joint portion. Joint. It is preferable that the non-joining portion does not exist at all, and in the case where the non-joining portion is present, the width is preferably 3 mm or less, particularly 2 mm or less, even at the widest portion.

From the same point of view, the joint portion in the side seal portion S is also preferably as small as possible in width. However, when the width of the side seal portion S is excessively small, the force for joining the front side sheet member 6A and the back side sheet member 6B tends to decrease, and the joint portion of the diaper 1 is worn. Damaged. When considering these matters comprehensively, the width of the joint portion is preferably 0.01 mm or more, and more preferably 0.1 mm or more. Further, it is preferably 3 mm or less, and more preferably 2 mm or less. For example, the width of the joint portion is preferably 0.01 mm or more and 3 mm or less, and more preferably 0.1 mm or more and 2 mm or less.

As described above, in order to smoothly form the side seal portion S in which the smooth waveform is drawn, it is preferable to form the side seal portion S as follows, that is, at least one of the following conditions, preferably any two, Further preferably all three: (i) the side seal portion S is formed by a linear joint portion including a continuous line extending in the longitudinal direction X of the diaper 1; (ii) in the side seal portion S, at the joint portion Further, there is no non-joining portion as far as the lateral direction Y is outside; and (iii) the width of the joint portion in the side seal portion S is narrow. Further, in order to realize such a configuration, for example, it is preferable to form the side seal portion S using the laser fusing device 120 shown in Fig. 6 .

The method of forming the side seal portion S of the laser fusing device 120 shown in FIG. 6 has a side portion of the joint portion in which the edges of the front side sheet member 6A and the back side sheet member 6B are fused in an overlapping state. a method of forming the seal S, At least a part of the sheets of the front side sheet member 6A and the back side sheet member 6B comprise a resin material, and the method of forming the side seal portion S has the following steps: One surface of the sheet laminate in which the front sheet member 6A and the back sheet member 6B are overlapped is in contact with a support member having a light passage portion through which laser light passes, and the light passage portion is passed from the support member side. The sheet laminated body in a pressurized state is irradiated with laser light having a wavelength at which the sheet is heated by the sheet constituting the sheet laminated body, thereby dividing the sheet. The laminated body is formed by fusing the cut edge portions of the front side sheet member 6A and the back side sheet member 6B in the pressed state due to the division. Hereinafter, the method will be described with reference to Fig. 6 .

As shown in FIG. 6, the laser-type engagement device 120 includes a hollow cylindrical roller 123 including a cylindrical (annular) support member 121 that is rotationally driven in the direction of the arrow A, and an illumination head 135 disposed thereon. a hollow portion of the support member 121, irradiating the laser light 130; and a belt type pressurizing device 126 including a ring-shaped pressure belt 124 (pressing member) as a pressurizing means and a state in which the pressurizing belt 124 is placed A plurality of rollers 125a, 125b, 125c that are rotated downward. The laser bonding apparatus 120 includes a tension adjusting mechanism (not shown) that can be wound around the outer circumferential surface of the annular support member 121 (the circumferential surface of the cylindrical roller 123) The tension of the press belt 124 is adjusted up and down, and by the adjustment of the tension, the pressure applied to the diaper continuous body 110 (sheet laminate) by the support member 121 and the pressure belt 124 can be appropriately adjusted. The diaper continuous body 110 is used to manufacture the diaper 1 of the present embodiment, and has a shape in which a plurality of diapers 1 are joined in the lateral direction Y.

The support member 121 forms a circumferential surface portion (abutting portion with the workpiece) of the cylindrical roller 123, and is sandwiched and fixed between one of the left and right side edge portions of the cylindrical roller 123 and the annular frame bodies 122 and 122. The support member 121 includes a single annular member having the same length as the circumference of the annular frame 122, and is made of a metal material such as iron, aluminum, stainless steel, or copper, or a material having heat resistance such as ceramic.

The support member 121 has a light passage portion through which laser light can pass. The support member 121 has a slit-shaped opening portion 127 that penetrates the support member 121 in the thickness direction as a light passage portion. The opening portion 127 has a rectangular shape in a plan view, and the longitudinal direction thereof coincides with the width direction of the support member 121 (the direction parallel to the rotation axis of the cylindrical roller 123), and is spaced apart in the circumferential direction of the cylindrical support member 121. A plurality of intervals are formed. In the support member 121, the opening portion 127 passes the laser light, and on the other hand, the portion other than the opening portion 127 does not pass (transmit) the laser light. As a method of forming the opening portion 127 in the support member 121, 1) In addition to the method of etching, punching, and laser processing equal to the opening portion 127 of the specific portion of the supporting member 121, 2) as the supporting member 121, a plurality of curved rectangular members are used instead of the single one. The annular member is a method in which the plurality of members are disposed between the pair of frames 122 and 122 at a predetermined interval in the circumferential direction of the frame 122. In the method of the above 2), the interval between the two adjacent members is the slit-shaped opening portion 127.

Further, in the laser bonding apparatus 20, the light passing portion through which the laser light passes can include the slit-shaped opening portion 127 through which the supporting member 121 penetrates in the thickness direction, and therefore the opening portion 127 of the diaper continuous body 10 The overlapping portion, that is, the divided predetermined portion, only abuts against the pressure belt 124, and is not sandwiched by the support member 121 and the pressure belt 124. Therefore, strictly speaking, the pressing force generated by the sandwiching of the two members 121, 124 does not occur in the predetermined portion to be divided. However, even if the predetermined portion overlapping the opening portion 127 is not sandwiched by the two members 121, 124, the portion overlapping the vicinity of the opening portion 127 in the vicinity of the diaper continuum 110 is separated by the two members 121, Since the 124 is clamped, it does not move before and after the irradiation of the laser light, and therefore the cut edge portion which is generated by the division of the diaper continuous body 110 irradiated with the laser light does not move. That is, the predetermined portion of the division of the diaper continuum 110 is subjected to the pressing force which is caused by the clamping of the two members 121, 124, and is actually affected by the pressing force.

The belt type pressurizing device 126 includes a ring-shaped pressure belt 124 and three rollers 125a, 125b, and 125c that rotate in a state in which the pressure belt 124 is placed. The rollers 125a, 125b, 125c may be driven rollers or may be driven rollers that rotate with the cylindrical rollers 123. The pressure belt 124 is rotationally driven by any one or more of the rollers 125a, 125b, and 125c, and is moved at the same speed as the cylindrical roller 123 (support member 121). The support member 121 and the pressure belt 124 are preferably maintained at a specific temperature range by air cooling, water cooling, or the like.

As the pressure belt 124, a belt made of metal or resin having heat resistance which can withstand heat generated during processing can be used, for example, a metal material such as iron, aluminum or stainless steel. Further, as the pressure belt 124, a diaper continuous body 110 which does not have a pair of workpieces is usually used. The transparency of the irradiated laser light may be used, but the person having the transparency may also be used.

As shown in FIG. 6, in the hollow portion of the hollow cylindrical roller 123 (support member 121), an irradiation head 135 that irradiates the laser light 130 toward the support member 121 that forms the circumferential surface portion of the cylindrical roller 123 is provided. The illuminating head 135 is a galvanometer scanner that freely scans the laser light 130, and includes a mechanism that advances and retracts the laser light 130 in a direction parallel to the rotation axis of the cylindrical roller 123, and causes the laser light 130 to contact the diaper on the support member 121. A mechanism for moving the position (irradiation point) of the continuous body 110 in the circumferential direction of the cylindrical roller 123, a mechanism for fixing the spot diameter of the laser light 130 on the circumferential surface of the cylindrical roller 123, and the like. With such a configuration, the laser irradiation unit can make the irradiation point of the laser light 130 in the circumferential direction of the cylindrical roller 123 and the direction orthogonal to the circumferential direction (the direction parallel to the rotation axis of the cylindrical roller 123). Move freely.

As shown in Fig. 6, the diaper continuous body 110 is introduced into the support member 121 which forms the circumferential surface of the cylindrical roller 123 which is rotationally driven in the arrow A direction by a guide roller (not shown) or the like while being applied with a specific tension. On the outer surface, a predetermined distance is transferred in the circumferential direction by the rotation of the cylindrical roller 123 so as to be wound around the support member 121, and then the support member 121 is removed from the support member 121 by a discharge roller or a nip roller (not shown). Separation. In this manner, the diaper continuous body 110 is wound around the support member 121 forming the circumferential surface portion of the cylindrical roller 123 with a specific tension, and is pressure-bonded by the pressure belt 124 to be conveyed, whereby the support member in the diaper continuous body 110 is supported. The portion sandwiched between the pressure belt 124 and the vicinity thereof is in a state of being pressed in the thickness direction from the division by the irradiation of the laser light. Therefore, when the diaper continuous body 110 includes a synthetic resin nonwoven fabric, etc. The diaper continuous body 110 can be more efficiently compressed. As a result, when the compressed diaper continuous body 110 is irradiated with laser light and divided, the plurality of sheets constituting the divided portion can be cut. The flange portions are more reliably fused to each other, and the fusion strength of the joint portion in the side seal portion S is further improved.

The rotation angle of the support member 121 (the cylindrical roller 123) from the diaper continuous body 110 to the support member 121 to be separated can be, for example, 90 degrees or more and 270 degrees or less, more preferably 120 degrees or more and 270. Below the degree. Also, regarding the diaper connection by the pressure belt 124 When the angle at which the continuation member 110 is pressed against the support member 121 is set to 360 degrees over the entire circumference of the cylindrical support member 121 (the cylindrical roller 123), it is preferably 90 degrees or more and 270 degrees or less, more preferably 120 degrees or more and 270 degrees or less.

In the method of forming the side seal portion S, as shown in FIG. 6, the diaper continuous body 110 is continuously conveyed, and the one surface 110a (see FIG. 7(a)) is formed on the circumferential surface portion of the cylindrical roller 123, and is brought into contact with each other. In the outer surface of the support member 121 having the slit-shaped opening portion 127 through which the laser light 130 passes, the diaper continuous body 110 in the pressurized state is irradiated with the laser light 130 from the side of the support member 121 via the opening portion 127, thereby dividing the laser light 130. The diaper continuous body 110 simultaneously fuses the cut edge portions of the plurality of sheets in the pressurized state resulting from the division to form the side seal portion S.

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. 7( a ) is opposite to the one surface 110 a of the abutting surface with the support member 121 The diaper continuous body 110 in this state is irradiated with the laser light 130 from the side of the support member 121 via the slit-shaped opening portion 127, whereby the pair of side seal portions S are continuously manufactured. Diaper 1. In this manner, the diaper continuous body 110 in a pressurized state by the supported member 121 and the pressure belt 124 is irradiated with the laser light 130, so that the cut edges of the plurality of sheets produced by the irradiation are mutually It is preferable from the viewpoint of surely fusing and increasing the fusion strength of the side seal portion S.

7(a) to 7(c) are views showing a state in which the side seal portion S is formed while the diaper continuous body 110 is divided by the laser bonding apparatus 120, and FIG. 7(a) schematically shows the use of the diaper continuum. The laser light 130 of 110 generates a segmentation predetermined portion 110C and its vicinity. The divided predetermined portion 110C of the diaper continuous body 110 is the center of the transport direction A of the region of the diaper continuous body 110 where the absorbent body 5 is not disposed. The divided portion 110C is a four-layered structural portion in which, for example, four sheets are stacked. As shown in Fig. 7 (a), the four-layer structure portion includes two sheets (the outer layer sheet 61 and the inner layer sheet 62) of the front side sheet member 6A and two of the back side sheet members 6B. The materials 61 and 62 are formed by laminating these four sheets. Furthermore, in the sheets 61 overlapping each other, The elastic members 80a and 80b are interposed between the 62th members. However, in FIGS. 7(a) to 7(c), the illustration of the elastic members 80a and 80b is omitted from the viewpoint of easy description.

In the divided predetermined portion 110C in the diaper continuous body 110, the outer sheet sheet 61 and the sheet other than the sheet constituting the one side 110a are formed on one surface 110a (abutting surface with the supporting member 121) of the diaper continuous body 110 (inside) Either or both of the layer sheets 62) are sheets which absorb the laser light 130 and generate heat. Further, the two sheets which are overlapped between the predetermined portion 110C and the vicinity thereof may be joined by an adhesive or the like before the laser light 130 is irradiated, or may be completely unjoined.

As shown in Fig. 7 (b), the diaper continuous body 110 is abutted against the support member 121 with one surface 110a, and the divided predetermined portion 110C is placed on the slit-shaped opening portion 127, and is introduced to support in the direction of the arrow A. On the member 121, the pressure belt 124 is pressed against the other surface 110b, and is pressurized in the thickness direction while being conveyed in the direction of the arrow A. In the conveyance, the laser beam 130 is irradiated to the divided portion 110C in the pressurized state via the opening 127 from the side of the support member 121. As described above, the irradiation spot of the laser light 130 is configured to be arbitrarily movable in the circumferential direction of the cylindrical roller 123, and is set to follow the movement of the opening 127 in the circumferential direction, so that the division is located on the opening 127. The predetermined portion 110C continuously irradiates the laser light 130 at a fixed time during the conveyance.

When the laser beam 130 is irradiated to the divisional predetermined portion 110C, the material (synthetic fiber or the like) of the sheets 61 and 62 existing in the division predetermined portion 110C is vaporized and disappeared by the heat generated by the direct irradiation of the laser light 130, and is present. The forming material in the vicinity of the divided portion 110C is melted indirectly by the laser light 130. As a result, as shown in FIG. 7(c), the predetermined portion 110C is melted, and one diaper 1 is cut out from the diaper continuous body 110, and the diaper continuous body 110 is divided, and the division is caused by the division. The cut edges of the four sheets 61, 62 in the diaper 1 and the cut edges of the four sheets 61, 62 of the cut diaper continuous body 110 are mutually. The cutting edge portions are respectively from the front of the formation (before the division of the diaper continuum 110 by irradiation of the laser light 130), by the supported member The 121 is clamped to the pressure belt 124 to be in a pressurized state (compressed state). According to this method, by irradiating the laser light once, the division of the diaper continuous body 110 and the cutting edge portions of the sheets in the pressurized state of the two portions resulting from the division are fused to each other, thereby By irradiating the fusion light of the two portions by the laser light twice, it is possible to perform fusion and division in the same step by using approximately half of the laser output, and the diaper 1 can be efficiently manufactured. Further, since the fusion and the division can be performed in the same step, the non-joining portion where the cut edge portions of the sheet are not fused to each other does not occur, so that the side seal portion S does not become hard, and thus the wearing state of the diaper 1 is obtained. It is smoothly deformed and smashed.

The cut edge portions of the sheets 61 and 62 are heated in the irradiation of the laser light 130 and immediately after the irradiation, and are in a molten state. However, each of the diaper precursors cut out from the diaper continuous body 110 by the irradiation of the laser light 130 is used. Each of the diaper continuous bodies 110 maintains a pressurized state by the support member 121 and the pressure belt 124, and is easily cooled by contact of the support member 121 after the irradiation is completed, by external air or to the support member 121, plus The heat transfer of the pressure belt 124 is rapidly cooled and solidified, and the fusion forming portion 140 in which the forming material of the cutting edge portion is melted and integrated is formed. As described above, one of the pair of side seal portions S and S of one of the diapers 1 is formed by forming the fusion portion 140. The cutting edge portion of the sheets 61 and 62 may be forcibly cooled by using a known cooling device such as a suction device or an exhaust device, and the formation of the fusion portion 140 may be promoted.

When the divided portion 110C of one portion is divided as described above, the laser light 130 is moved so that the irradiation spot thereof is irradiated to the other opening portion 127 adjacent to the opposite direction of the transport direction A, and is irradiated to the other opening portion 127 via the other opening portion 127. The other is divided into a predetermined portion 110C. Thereby, the other divided predetermined portion 110C is divided and fused in the same manner as described above, and the other side seal portion S which is paired with the previously formed side seal portion S is formed. Thereafter, the diaper 1 having a pair of side seal portions S, S is continuously produced by repeating the same operation. In this method, the side seal portion S of the diaper 1 is formed by a fusion process using laser light irradiation, instead of being formed by other fusion processes.

The width W of the slit-like opening portion 127 irradiated with the laser light 130 (see FIG. 7(b), the length of the opening portion 127 along the circumferential direction of the cylindrical roller 123), the laser light 130 on the diaper continuum 110 The diameter of the spot (the portion irradiated by the laser light 130) In smaller cases ( When /W is less than 1, as shown in FIG. 8, one pair of side seal portions S, S formed by irradiation of the laser light 130 may be located at a portion of the diaper continuous body 110 that overlaps with the opening portion 127 ( In a plan view, a portion of the slit-shaped opening portion 127 that is in a direction orthogonal to the conveyance direction A is a portion that is sandwiched by the opening edge portion. In other words, in the diaper continuous body 110, even if the portion where the support member 121 is not sandwiched by the pressure belt 124 is in the vicinity of the opening portion 127, it is actually sandwiched between the two members 121 and 124 as described above. The fusion portion 140 may also be formed at a portion where the influence of the applied pressure is applied.

In the diaper 1 obtained in this manner, as shown in FIG. 9, the thickness T1 of the side seal portion S is compared with the side seal portion S of each of the front side sheet member 6A and the back side sheet member 6B constituting it. The thickness T2 of the adjacent portion becomes large. The thickness T1 of the side seal portion S cuts the side seal portion, and the cross section is observed with a microscope and measured without load. The thickness T2 of the front side sheet member 6A and the back side sheet member 6B is at a position from the side seal portion S toward the side edge of the absorbent body 5 and spaced apart from the side seal portion by a distance of 1 mm to 10 mm. Observe the section and measure. The thickness T2 of the front side sheet member 6A and the back side sheet member 6B is measured by the distance between the flat sheets in a state where the sheet members 6A and 6B are sandwiched between the flat plates and a load of 0.5 cN/cm ² is applied. The value is taken as the thickness. The measurement of the thickness of the side seal portion or the like of the microscope is performed by a microscope (manufactured by KEYENCE Co., Ltd., VHX-1000) or the like at a ratio of 50 to 200 times, and the three side portions of the side seal portion of the diaper are separated in the longitudinal direction. The thickness of each section was obtained from the cross section, and the average of the thicknesses of the three measured parts was calculated|required. The thickness T1 of the side seal portion S is preferably 0.2 mm or more, more preferably 0.25 mm or more, and is preferably 2 mm or less, and more preferably 1.5 mm or less. The thickness T1 of the side seal portion S is, for example, preferably 0.2 mm or more and 2 mm or less, and more preferably 0.25 mm or more and 1.5 mm or less.

As the laser light used in the above-described manufacturing method, laser light which can be absorbed by a sheet constituting the diaper continuous body 110 and which generates heat is used. The sheet constituting the diaper continuous body 110 is not particularly limited, and may be any sheet as long as it is a sheet constituting the diaper continuous body 110. Regarding the respective sheets constituting the diaper continuous body 110, whether or not the laser light irradiated to the diaper continuous body 110 is a wavelength which can be absorbed by the sheet and heats the sheet, is based on the material of the sheet and the laser light used. The relationship of wavelengths is determined. In the case where the sheet constituting the diaper continuous body 110 is a non-woven fabric or a film made of a synthetic resin which is commonly used in the manufacture of absorbent articles (hygiene articles) such as disposable diapers or sanitary napkins, it is preferable to use CO as laser light. ₂ laser, YAG (Yttrium aluminium garnet) laser, LD (Laser Diode) laser (semiconductor laser), YVO ₄ laser, fiber laser and so on. Further, when the sheet constituting the diaper continuous body 110 contains polyethylene, polyethylene terephthalate, polypropylene or the like as a synthetic resin, it can be absorbed by the sheet and the sheet can be heated well. The wavelength is, for example, preferably 8.0 μm or more and 15.0 μm or less, and particularly preferably an oscillation wavelength of 9.0 μm or more and 11.0 μm or less of a CO 2 laser having a high output laser device. The spot diameter and the laser output of the laser light can be appropriately selected in consideration of the material or thickness of the sheet constituting the diaper continuous body 110.

Another embodiment of the present invention is shown in Figs. 10 and 11 . Further, the description of the previous embodiments is appropriately applied to the aspects which are not particularly described in the embodiment. In addition, in FIGS. 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, the front side first elastic member 81a and the front side second elastic member 82a extending in the lateral direction Y of the diaper 1 are disposed in the stretched state in the front side sheet member 6A. A plurality of articles. Similarly, in the back side sheet member 6AB, the back side first elastic member 81b and the back side second elastic member 82b extending in the lateral direction Y of the diaper 1 are arranged in a plurality of sheets in an extended state.

The first elastic members 81a and 82a are disposed in the plurality of elastic members 81a and 82a of the abdominal sheet member 6A, and the first elastic members 81a are relatively high-elongation stress elastic members having relatively high elongation stress. On the other hand, the ventral second elastic member 82a is a ventral low extension with a relatively low elongation stress. Long stress elastic member. The front side first elastic member 81a and the front side second elastic member 82a are alternately arranged in the longitudinal direction X of the diaper 1. The interval between the front side first elastic member 81a and the front side second elastic member 82a is equal to each other.

The back side sheet member 6B is disposed in the plurality of elastic members 81b and 82b of the back side sheet member 6B, and the back side first elastic member 81b is a ventral side high elongation stress elastic member having a relatively high elongation stress. . On the other hand, the back side second elastic member 82b is a ventral low elongation stress elastic member having a relatively low elongation stress. The back side first elastic member 81b and the back side second elastic member 82b are alternately arranged in the longitudinal direction X of the diaper 1. The interval between the back side first elastic member 81b and the back side second elastic member 82b is equal to each other. This interval is the same as the interval between the front side first elastic member 81a and the front side second elastic member 82a.

The elongation stress refers to the load required to stretch the elastic member by a specific length along its length. Moreover, the fact that the elongation stress is large means that the load required for stretching a specific length is large. In the present embodiment, the elongation stress of the first side elastic member 81a of the abdominal portion which is a relatively high elongation stress is higher than that of the second side elastic member 82b which is the back side portion of the elastic member which exhibits a relatively low elongation stress. Becomes high. Further, the elongation stress of the first side elastic member 81b as the back side portion of the elastic member indicating the relatively high elongation stress is relatively higher than the abdominal portion second portion elastic member 81b which is the elastic member indicating the relatively low elongation stress.

Further, in the present embodiment, the elongation stress of the first side elastic member 81a of the front side portion of the elastic member showing the relatively high elongation stress substantially coincides with the elongation stress of the first side elastic member 81b of the back side portion. Further, the elongation stress of the second side elastic member 81b of the front side portion of the elastic member showing the relatively low elongation stress substantially coincides with the elongation stress of the second side elastic member 82b of the back side portion. The term "substantially consistent" 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 front side sheet member 6A and the elastic members 81b and 82b disposed on the back side sheet member 6B are observed in the longitudinal direction X of the diaper 1. When the member is at the position of the end portion of the side seal portion S, the position of the elastic members 81a and 82a disposed on the front side seal member S at the end portion of the side seal portion S and the elasticity of the rear side sheet member 6B are disposed. The positions of the ends of the side seal portions S of the members 81b and 82b are substantially the same. Further, when viewed in the longitudinal direction X of the diaper 1, the position of the first partial elastic member 81a of the abdominal portion is substantially the same as the position of the second elastic member 82b of the back side portion, and the position of the second elastic member 82a of the front side portion is The positions of the back side first elastic members 81b are substantially the same. The term "substantially consistent" means that the degree of positional deviation is within 2 mm.

When the diaper 1 having the above configuration is worn, the tensile force F acts on the elastic members toward the lateral direction Y, whereby the ends of the elastic members are pulled toward the longitudinal center line CL of the diaper 1. At this time, in the front side first elastic member 81a and the back side second elastic member 82b which are located at the same height in the longitudinal direction X, the extension stress of the first partial elastic member 81a of the front side portion is relatively higher, and thus the abdomen Both of the side first elastic member 81a and the rear second elastic member 82b are pulled toward the longitudinal center line CL of the front sheet member 6A. On the other hand, in the second side elastic member 82a and the back side first elastic member 81b which are located at the same height in the longitudinal direction X, the elongation stress of the back side first elastic member 81b is relatively higher, Both the second side elastic member 82a of the front side portion and the end portion of the back side first elastic member 81b are pulled toward the longitudinal center line CL of the back side sheet member 6B. Further, the front side second elastic member 82 and the back side first elastic member 81b and the front side second elastic member 82a and the back side first elastic member 81b are alternated in the longitudinal direction X of the side seal portion S. The ground is present, and thus, as shown in FIG. 11, the side seal portion S is deformed in a wave shape in the longitudinal direction X.

In order to control the elongation stress of each elastic member, for example, the following methods (a) to (c) can be employed.

(a) When the high elongation stress elastic member and the low elongation stress elastic member are disposed and fixed in an extended state, the elongation is the same, and the thickness of the elastic members is different. Specifically, a relatively thick diameter elastic member is used as the high elongation stress elastic member, and is used. A relatively thin diameter elastic member is used as the low elongation stress elastic member.

(b) The 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 elongation in the elongate state is fixed to be different. Specifically, the high elongation stress elastic member is configured to be fixed at a relatively high elongation ratio, and the low elongation stress elastic member is configured to be fixed at a relatively low elongation ratio.

(c) Combinations (a) and (b).

Another embodiment of the diaper of the present invention is shown in Figs. 12 and 13 . The embodiment shown in the figures shows the side seal portion S in the state before the diaper 1 is worn and its vicinity. Further, the embodiment shown in the drawings is a modification of the embodiment shown in Figs. 4 and 5. Therefore, the description about the embodiments shown in FIGS. 4 and 5 is appropriately applied to the aspects not specifically described herein.

In the embodiment shown in FIG. 12 and FIG. 13, the visibility of the position where the side seal portion S is formed is improved, and the tearing operation of the side seal portion S when the diaper 1 is discarded is easily performed. In order to make the side seal portion S easily deformable in the worn state of the diaper 1, it is advantageous to employ at least one of the above (i) to (iii). However, the use of the above (i) to (iii) has a tendency to lower the visibility of the side seal portion S. Therefore, in the embodiment shown in Fig. 12, the step D1 is set on the upper portion of the side seal portion S by making the position of the upper side of the front side sheet member 6A different from the position of the upper side of the back side sheet member 6B. It is easy to visually recognize the position of the side seal portion S. At the same time, by setting the position of the lower side of the front side sheet member 6A to be different from the position of the lower side of the back side sheet member 6B, a step D2 is provided in the lower portion of the side seal portion S, whereby the side seal can be easily viewed. The location of the department S. The steps D1 and D2 contribute not only to the improvement of the visibility of the side seal portion S but also to 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 front side sheet member 6A is the same as the position of the upper side of the back side sheet member 6B, but a notch portion N1 which is a notch portion is provided on the upper portion of the side seal portion S. It is easy to visually recognize the position of the side seal portion S. Further, in the present embodiment, the ventral side The position of the lower side of the sheet member 6A is the same as the position of the lower side of the back side sheet member 6B. However, since the notch N2 which is a notch portion of the wedge shape is provided in the lower portion of the side seal portion S, the position of the side seal portion S can be easily visually recognized. The notches N1 and N2 contribute not only to the improvement of the visibility of the side seal portion S but also to the ease of tearing of the side seal portion S.

Next, the second invention will be described with reference to Figs. 14 to 20 . Regarding the aspect in which the second invention is not particularly described, the description of the first invention will be appropriately applied. In addition, in FIGS. 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 pant type disposable diaper which, although including a side seal portion, has an outer appearance such as a panty, and the side seal portion is soft and the skin feel is excellent. As shown in Figs. 14 to 16, a pant-type disposable diaper 101 according to an embodiment of the second invention includes an absorbent body 102 and an outer surface of the outer surface forming the wearing article, and the front body F is joined (the ventral side). In the portion 101A), the left and right side edges A1 of the outer casing 103 in the longitudinal direction X and the left and right side edges B1 of the outer casing 103 in the longitudinal direction X in the back piece R (the back side portion 101B) Further, B1 is formed with a pair of side seal portions 104 and 104, a waist opening portion 108, and a pair of leg opening portions 109 and 109. The exterior body 103 is positioned on the non-skin contact surface side of the absorbent body 102 to fix the absorbent body 102.

The diaper 101 has a longitudinal direction X corresponding to the front and rear directions of the wearer and a transverse direction Y orthogonal thereto in a plan view in which the diaper 101 is unfolded and stretched as shown in FIG. The diaper 101 can be divided into a crotch portion 101C disposed at the lower portion of the crotch when worn, and a ventral side portion 101A and a back side portion 101B located before and after the longitudinal direction X. In the crotch portion 101C, the outer casing 103 has recessed portions for forming the leg openings 109 and 109 in the left and right side edges along the longitudinal direction X. Further, as shown in Fig. 17, the diaper 101 is divided into an imaginary center line CL which divides the diaper 101 into two in the longitudinal direction X, and can be divided into a front piece F and a back piece R.

Further, in the present specification, the skin-contacting pant-type disposable diaper or a constituent member thereof (for example, an absorbent body) is worn toward the wearer's skin side, and the non-skin abutting face type is discarded. a diaper or a component thereof that is worn toward the wearer's skin when worn The side of the opposite side (dressing side) of the side. In the diaper 101, the longitudinal X-shape coincides with the direction (longitudinal direction) of the long side of the absorbent body 102 as a trouser-type disposable diaper or a constituent member thereof, and the lateral Y-series and the pant-type disposable diaper or as a constituent member thereof The width direction of the absorbent body 102 is uniform.

As shown in Fig. 16, the absorbent body 102 has a vertically long shape in one direction (longitudinal direction X), and has a front sheet (not shown) that forms a skin contact surface, and forms a non-skin abutting surface. A back sheet (not shown) and a liquid retaining absorber (not shown) disposed between the two sheets, the absorber having a shape that is long in the same direction as the longitudinal direction X. The absorbent body 102 is formed such that its longitudinal direction coincides with the longitudinal direction X of the diaper 101 in the unfolded and stretched state, and is joined to the central portion of the exterior body 103 by a known joining means (adhesive or the like). Here, the unfolded and stretched state refers to the peeling of the side seal portion, and the diaper is in an unfolded state, and the elastic members of the respective portions of the diaper in the unfolded state are elongated to expand to a design size (and the influence of all the elastic members is excluded). The state up to the same size when the plane is expanded in the state.

As shown in FIGS. 15 and 16, the exterior body 103 is configured to include an outer layer sheet 131 that forms an outer surface of the diaper 101 (a non-skin contact surface of the exterior body 103); an inner layer sheet 132, which is disposed On the inner surface side of the outer layer sheet 131, and forming the inner surface of the diaper 101 (the skin abutting surface of the outer body 3); and a plurality of linear or strip-shaped elastic members 105, 106, 107, etc. It is fixed between the two sheets 131 and 132 by an adhesive. The two sheets 131 and 132 are joined to each other at a specific portion by an adhesive or heat seal (not shown).

The exterior body 103 (the outer layer sheet 131 and the inner layer sheet 132) contains a resin material and is formed mainly of the resin material. An example of the exterior body 103 (the outer layer sheet 131 and the inner layer sheet 132) is a synthetic resin containing a heat-fusible property such as polyethylene, polyethylene terephthalate or polypropylene as a resin material. It includes non-woven fabrics, films, and laminated sheets of non-woven fabrics and films. Examples of the nonwoven fabric include hot air non-woven fabric, hot rolled non-woven fabric, water jet non-woven fabric, spunbonded non-woven fabric, and melt-blown non-woven fabric.

As shown in FIG. 15, one of the pair of side seal portions 104, 104 of the diaper 101 has a continuous line-shaped fusion portion 140 extending in the longitudinal direction of the side seal portion 104, and the edge of the outer body 103 in the front body sheet F is formed. The sealing edge portion 141 is formed by combining the edge portion of the outer casing 103 with the back body piece R. The sealing edge portion 141 of the diaper 101 is continuously formed over the entire length between the waist opening portion 108 and the leg opening portion 109 in each of the side seal portions 104 and 104. The sealing portion 140 in the sealing edge portion 141 is in a state in which the edge portions of the plurality of sheets (the outer layer sheet 131 and the inner layer sheet 132) constituting the exterior body 103 are stacked, and the constituent resins of the sheets are laminated. It is formed by melt solidification.

As shown in FIG. 17, the fusion portion 140 in the sealing edge portion 141 is oriented on a cross section orthogonal to the direction in which the side sealing portion 104 extends, and the side of the wearing article that is close to the wearer's skin is away from the side of the wearer's skin. When the length of the inner and outer directions P is the width W, and the length of the direction Q orthogonal to the direction P of the center position of the width W is the thickness T, the thickness T of the fusion portion 140 is different from the front body 101A side. The total thickness (Ta+Tb) of the outer casing 103 on the side of the body 103 and the back body piece 101B is the same or smaller, and the thickness T of the fusion portion 140 is larger than the outer body 103A and the rear body 103 and the rear body. The thickness (Ta or Tb) of at least one of the outer casings 103 on the sheet 1B side.

The thickness Ta of the outer body 103 of the front body 101A side and the thickness Tb of the outer body 103 of the back body piece 101B side are the thicknesses of portions other than the side seal portion 104, and preferably, the front body piece 101A and the back body. Each of the sheets 101B measures the thickness in a range from the immersed lateral direction Y (see FIG. 15) to the fused portion 140 at a distance Lt of 1 mm to 11 mm.

Further, the measurement of the thickness Ta and the thickness Tb was carried out by measuring a sample cut out from each of the outer body 101A side outer body and the back body piece 101B side outer body, and 0.5 cN/cm ² was applied between the flat plates. The distance between the plates in the state of the load is set to the thickness. The sample was cut into a square shape of 10 mm × 10 mm, and cut into a size as close as possible when it was not cut into the size.

On the other hand, the width W and the thickness T of the fusion portion are controlled by a microscope (KEYENCE) The VHX-1000 manufactured by the company was observed at a magnification of 50 to 200 times, and the profile was measured without applying a load.

The thickness Ta, the thickness Tb, and the width and thickness of the fusion portion are measured for each of the three different portions along the direction of the side seal portion 104, and the average value of the measured values is set to each value.

The size of each part is preferably measured to a unit of 0.01 mm.

Further, the reason why the thickness T of the fusion portion 140 is measured at a central position at which the width W of the fusion portion 140 is equally divided is that the thickness can be measured for each of the samples having various seal shapes in accordance with the samples.

Further, the outer edge 104a of the fusion portion 140 has a shape that is largely recessed toward the inner side in the inner and outer direction P, and the fusion portion is formed when one of the outer edges 104a is present on the inner side of the line W of the width of the fusion portion 140. The thickness T is set to a thickness including the thickness of the space portion on the inner side of the halved line.

The thickness T of the fusion-molded portion 140 is equal to or smaller than the total thickness (Ta + Tb) of the outer body 103 and the outer body piece 101B side outer casing 103, and is applied to the fusion portion 140. Specific pressure, firmly fused.

Further, by making the thickness T of the fusion portion 140 larger than at least one of the thickness Ta and the thickness Tb, the molten portion is not excessively melted and solidified, so that the sealing portion is soft and the skin feels good. Here, the feeling that the skin feels good also includes the meaning that the wearer feels good.

In particular, when the thickness T of the fusion-molded portion 140 is larger than each of the thickness Ta and the thickness Tb, the molten portion is not excessively melted and solidified. Therefore, the sealing portion is soft, and the appearance and the skin feel are better, so that it is more preferable. .

In addition, the ratio (%) of the thickness T of the fusion-molded portion 140 to the total thickness (Ta+Tb) of the outer body of the front body piece 101A side and the back body piece 101B side is from the viewpoint of the fusion strength of the side seal portion. Preferably, it is 100% or less, further preferably 95% or less, and in addition, the appearance and the muscle From the viewpoint of the skin feel, it is preferably 30% or more, and more preferably 50% or more, and is preferably 30 to 100% from the viewpoint of the appearance and the touch of the skin and the fusion strength of the side seal portion. Further preferably 50 to 95%.

Moreover, the difference (Ta+Tb-T) between the total thickness (Ta+Tb) of the outer body 101A side and the back body piece 101B side outer body and the thickness T of the fusion portion 140 is the fusion strength of the side seal portion. The viewpoint is preferably 0 mm or more, more preferably 0.02 mm or more, and is preferably 0.25 mm or less, more preferably 0.2 mm or less from the viewpoint of skin feel, and the side seal portion is further provided. From the viewpoint of the fusion strength and the touch of the skin, it is preferably 0 to 0.25 mm, and more preferably 0.02 to 0.2 mm.

Further, the ratio (%) of the thickness T of the fusion-molded portion 140 to the thickness Ta of the outer casing 101A and the thickness Tb of the outer casing 101B side is the touch of the skin. From the viewpoint of the fusion strength of the side seal portion, it is preferably 300% or less, more preferably 200% or less, and further preferably, it is preferably 110% or more, and further preferably 150% or more. From the viewpoint of the fusion strength of the side seal portion and the touch of the skin, it is preferably from 110 to 300%, more preferably from 150 to 200%.

Moreover, the difference (T-Ta, T-Tb) between the thickness T of the fusion-molded portion 140 and the thickness Ta of the outer body of the front piece 101A and the thickness Tb of the outer body of the back piece 101B side is The viewpoint of the touch of the skin is preferably 0.05 mm or more, more preferably 0.1 mm or more, and is preferably 2.0 mm or less, and more preferably 1.0 mm from the viewpoint of the fusion strength of the side seal portion. In addition, from the viewpoint of the fusion strength of the side seal portion and the touch of the skin, it is preferably 0.05 to 2.0 mm, and more preferably 0.1 to 1.0 mm.

Further, it is preferable that the width W of the fusion portion 140 is smaller than the thickness T of the fusion portion 140 to exhibit an advantageous effect that the skin feel is better. From the same viewpoint, the width W of the fusion portion 140 is preferably 95% or less of the thickness T, more preferably 50% or less, still more preferably 10% or more, and still more preferably 30% or more. Further, it is preferably from 10 to 95%, more preferably from 30 to 70%.

Further, the width W of the fusion-molded portion 140 is preferably smaller from the viewpoint of improvement in flexibility or touch of the side seal portion, and is preferably 2.0 mm or less, more preferably less than 1.0 mm, and further It is preferably less than 0.3 mm. On the other hand, in terms of ensuring the sealing strength, it is preferably 0.1 mm or more.

Further, as for the thickness T of the fusion portion 140, as described above, it is preferably larger than the width W of the fusion portion 140. For example, when the width W of the fusion portion 140 is less than 0.3 mm, the thickness T of the fusion portion 140 is preferably It is 0.3mm or more.

The size relationship of the dimensions of the respective portions, in particular, the thickness T of the fusion portion 140 is larger than the thickness Ta of the outer body of the front piece 101A side or the thickness Tb of the outer body of the back body piece 101B side, using a hot rolling device or the like. A method of forming a side seal portion of a pressurized heating device is generally not possible. In other words, the side seal portion (fusion portion) which is formed by a conventional method using a pressurizing heating device heats the outer surface of the side seal portion while being compressed in the thickness direction, so that the fusion is obtained from the viewpoint of thermal efficiency and the like. The thickness of the portion is also generally smaller than the thickness of the outer body of the front piece 101A side or the back piece 101B side. In the step of forming the side seal portion 104, in order to prevent the thickness T of the fusion portion 140 from being the thickness Ta and/or Tb of the outer casing, it is important that the outer casing 103 suppress the degree of compression in the thickness direction. The side seal portion 104 is formed on one side. As a method of forming the side seal portion 104 while suppressing the compression of the exterior body 103, the fusion of the laser light is used. In other words, a method in which laser light is used as a fuse device of the exterior body 103, and a predetermined portion of the side seal portion 104 in the exterior body 103 is irradiated with laser light to be melted, thereby forming the side seal portion 104.

In the diaper 101 of the present embodiment, as shown in FIG. 18, the portion adjacent to the side seal portion 104 of each of the outer body 103 and the outer body piece 101B side of the outer body piece 101A side is attached. The concavo-convex regions 143 and 143 having a continuous wave shape in cross-sectional shape by shrinkage of the elastic member 106 disposed on the exterior body 103 are formed. In the uneven portion 143, the two sheets 131 and 132 constituting the exterior body 103 are adhered to each other without a gap via an adhesive, and these are integrally deformed into a cross-sectional wave shape.

Moreover, the elastically stretchable portion 144 having a structure different from that of the uneven portion 143 is formed on the center of the diaper width direction of the uneven portion 143 on both sides of the side seal portion 104. In the elastically stretchable portion 144, the two sheets 131 and 132 constituting the outer casing 103 are joined to each other in a plurality of joint portions 133 which are intermittently arranged in the longitudinal direction X and the width direction Y of the diaper 101, and extend in the lateral direction Y. The plurality of elastic members 105, 106 are disposed so as to pass between the adjacent joint portions 133 in the longitudinal direction X. Further, by the contraction of the elastic member 106, the portions of the two sheets 131, 132 located between the joint portions 133 are bulged away from each other as shown in Fig. 18(b) to form a plurality of creases 142. . The elastic members 105 and 106 are not joined to any one of the sheets 131 and 132 in the elastically stretchable portion 144, and on the other hand, in one of the two sides of the sandwich elastically stretchable portion 144, in the fixed region, via the adhesive It is fixed to the sheets 131 and 132. In the elastic member 105, one of the pair of side seal portions 104 is formed in the vicinity of the pair of side seal portions 143, and the uneven portion 143 formed in the vicinity of the side seal portion 104 is a fixed region. A fixed area is formed adjacent the side edges of the absorbent body 105 that extend longitudinally. The joint portion 133 shown in Fig. 18 (a) is arranged such that a joint portion including the joint portion 133 disposed along the longitudinal direction X of the diaper 101 is formed in a plurality of rows in the lateral direction Y of the diaper, and adjacent joint portions are arranged. The positions of the longitudinal directions X of the joints are identical. In the joint portion 133, the sheets 131 and 132 may be joined by an adhesive, or may be joined by heat fusion using heat sealing or the like, or may be joined by another joining method.

Further, in the wearing state of the diaper 101 of the present embodiment, the width W of the fusion portion 104 is smaller than the amplitude height h of the uneven portion 143. Since the size or shape of the waist of the wearer is personally different, whether or not the thickness T of the fusion-molded portion 104 is larger than the amplitude of the uneven portion 143 in the wearing state is determined in the approximate wearing state shown below.

<Approximate wearing state>

The state in which the elastic member is contracted (the state in which the force is not applied from the outside) is set to be naturally long, and the state in which the length is 1.5 times is set to be approximately the wearing state.

Thus, in the approximate wearing state, the width W of the fusion portion 104 is made smaller than the unevenness The amplitude h of the region 143 is such that the fusion portion 104 is less likely to contact the skin of the wearer, the parent, the caregiver, etc., and the skin feel of the side seal portion 1 or the outer surface of the diaper is further improved. The width W of the fusion portion 104 is preferably 70% or less, more preferably 50% or less, and still more preferably 20%, of the amplitude height h of the uneven portion 143 from the viewpoint of the difficulty in contact with the skin or the improvement in the touch of the skin. the following.

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

Specifically, in the first invention described above, the technical elements of the second invention can be employed in the side seal portion 104. For example, the side seal portion 104 of the pants-type disposable diaper 101 of the second invention has a seal edge portion 141 joined by a continuous linear fusion portion 140 as described above. Further, the thickness T of the fusion portion 141 is equal to or smaller than the total thickness of the outer body 103 and the outer side of the back side portion 101B side, and the thickness T of the fusion portion 141 is larger than the ventral side. The thickness of at least one of the outer body 103 and the outer side of the back side 101B side of the outer portion 101A side. Moreover, in a preferred embodiment of the pant-type disposable diaper 101, the side seal portion 104 extends straight along the longitudinal direction X of the diaper 101 in a state in which the diaper 101 is worn before the diaper 101 is worn. And in the wearing state, it extends X in the longitudinal direction of the diaper 101.

The pants-type disposable diaper 101 of the second invention can be produced, for example, by the production method described below.

The method of manufacturing the diaper 101 includes a step of superimposing a pressurization step of forming a predetermined portion of the side seal portion in the strip-shaped outer casing 103 in a state in which the front piece side and the back piece side are superposed, in a pressurized state; a side seal portion forming step of illuminating the predetermined portion of the side seal portion in a pressurized state by irradiating the laser beam through the light passage portion extending in a direction intersecting the transport direction A of the outer casing 103 The body 103 is formed, and the cut edge portions of the package body are fused to each other by the division state generated by the division to form a side seal portion 104. Further, before the superposition pressurization step, a main body fixing step of fixing the absorbent main body 102 to the belt-shaped outer casing 103 (the outer layer sheet 131 and the inner layer sheet 132) is provided.

More specifically, in the manufacturing method of the diaper 101, as shown in FIG. 20, in the above-described superposition and pressurization step, the belt-shaped outer casing 103 (outer layer sheet 131, inner layer sheet 132) is passed along The strip-shaped outer casing 103 to which the absorbent body 102 is fixed is overlapped with the front body side and the back body side, thereby manufacturing a "pants-type disposable diaper that does not form a side seal portion". A diaper continuous body 110" joined upwards. Then, in the side seal portion forming step, the strip-shaped outer casing 103 in the diaper continuous body 110 is separately divided (fuse) by irradiation of laser light, and the laminated state produced by the division is simultaneously performed. The cut edge portions of the plurality of outer covering members 103 (the outer layer sheet 131 and the inner layer sheet 132) are fused to each other, and the pant type disposable diaper having the pair of side seal portions 104, 104 and the outer body 103 is continuously manufactured. 101.

As described in more detail, first, as shown in FIG. 20, the strip-shaped outer sheet 131 continuously supplied from the original sheet roll (not shown) is continuously supplied from the original sheet roll (not shown). Between the strip-shaped inner layer sheets 132, a plurality of waist elastic members 105 forming waist gathers, a waist elastic member 106 forming waist gathers, and leg gathers are respectively disposed in an extended state elongated at a specific elongation. The leg elastic member 107. At this time, the leg elastic member 107 is disposed while forming a specific leg circumference pattern via a known rocking guide (not shown) that is orthogonal to the flow direction of the sheet and reciprocates. Further, before the strip-shaped outer layer sheet 131 and the strip-shaped inner layer sheet 132 are overlapped, the specific portions of the facing surfaces of either or both of the sheets 131 and 132 are overlapped. The hot melt type adhesive is applied by an adhesive applicator (not shown). Further, the elastic members such as the waist elastic member 105 and the waist elastic member 106 are spanned by the irradiation of the laser light across the two sheets 131 and 132 (the predetermined portion of the side seal portion 104 is formed as described above). In the case where the predetermined portion is divided by the symbol 110C in FIG. 7 in the state of being stretched, in order to avoid the large degree of compression of the elastic member after the division or the extraction of the elastic member, good The adhesive is applied in advance to the portion and its vicinity. The uneven portions 143 and 143 on both sides of the sandwiching side seal portion 104 in the diaper 101 are attached to the portion where the side seal portion 104 is formed and the vicinity thereof, and the interlayer sheet 131 and the inner layer sheet 132 are interposed with an adhesive. After the elastic members 105, 106 are broken, the elastic members 105, 106 are contracted together with the two sheets 131, 132 to be produced. The waist elastic member 105 and the waist elastic member 106 may be intermittently coated with a hot-melt adhesive by an adhesive applicator (not shown) before being disposed between the two sheets 131 and 132.

Further, as shown in FIG. 20, a belt-shaped outer sheet 131 in which the waist elastic member 105, the waist elastic member 106, and the leg elastic member 107 are sandwiched in an extended state is fed between the pair of nip rolls 111 and 111. The strip-shaped inner layer sheet 132 is pressed and pressed to form a strip-shaped outer casing 103 in which a plurality of elastic members 105, 106, and 107 are disposed in an extended state between the strip-shaped sheets 131 and 132.

Further, in the step of forming the exterior body 103, a bonding strip-shaped outer layer sheet is formed between the adjacent two waistline elastic members 106 and 106 by using bonding means such as the convex roller 112 and the supporting roller 113 corresponding thereto. 131 and a plurality of joint portions 133 of the strip-shaped inner layer sheet 132.

Thereafter, an elastic member pre-cutting device (not shown) is used as needed, and a plurality of waist elastic members 106 and a plurality of leg elastic members 107 are pressed to perform no contraction in accordance with the position at which the absorbent body 102 is disposed as described below. The way of function is divided into multiples. The elastic member pre-cutting device used in the method for producing a composite stretchable member described in JP-A-2002-253605, for example, is used.

Then, as shown in FIG. 20, the absorbent body 102 manufactured in another step is previously coated with an adhesive such as a hot-melt adhesive, and the absorbent body 102 is rotated by 90 degrees, and intermittently supplied to form a belt-shaped outer casing. The inner layer sheet 132 of the body 103 is fixed and fixed (main body fixing step). Then, as shown in FIG. 20, a leg hole is formed inside the annular portion surrounded by the leg elastic member 107 in the belt-shaped outer casing 103 in which the absorbent body 102 is disposed. LO'. This leg hole forming step can be carried out using a rotary cutter, a laser cutter or the like in the same manner as in the method of manufacturing such an article.

Then, the strip-shaped exterior body 103 is folded in the width direction (the direction orthogonal to the conveying direction of the exterior body 103). More specifically, as shown in FIG. 20, the both side portions 103a and 103a of the belt-shaped outer casing 103 in the conveying direction are folded back so as to cover both end portions of the absorbent body 102 in the longitudinal direction, and the absorbent body is fixed. After the both ends in the longitudinal direction of 102, the exterior body 103 and the absorptive main body 102 are folded in the same direction in the width direction (the superposition step in the superimposition pressurization step). In this manner, the diaper continuum 110 is obtained.

Then, the diaper continuous body 110 thus manufactured is irradiated with laser light by a laser bonding apparatus to form a pair of side seal portions 104 and 104 (side seal portion forming step), and is continuously manufactured to have a pair of the side seal portions 104. The pant type disposable diaper 101 of the outer casing 103. The laser bonding apparatus and the method of forming the side sealing portion 104 using the same are the same as those of the first invention, and the details thereof are shown in FIGS. 6 to 9.

In the diaper 101 thus manufactured, a sealing edge portion 141 is formed in the side seal portion 104, and the sealing edge portion 141 is formed in the front piece F by a continuous linear fusing portion 140 extending in the longitudinal direction of the side sealing portion. The edge portion A1 of the outer casing 103 is combined with the edge portion B1 of the outer casing 103 in the back piece R. Further, the thickness T of the fusion portion 140 is the same as or smaller than the total thickness (Ta + Tb) of the outer casing 103, and is larger than the thickness Ta of the outer body 103 or the thickness of the outer body 103 of the rear body side. The side seal portion 104 of the Tb can be easily obtained by appropriately adjusting the degree of pressurization when irradiating the laser light, or the output or spot diameter of the laser light.

Further, the sealing edge portion 141 has a shape including the outer edge 104a of the fusion portion 140 recessed toward the inner side of the diaper 101 in a cross section orthogonal to the direction in which the side sealing portion 104 is worn.

Further, as shown in FIG. 17, the sealing edge portion 141 is outside the relatively fusion portion 140 in the inner and outer directions P, and does not have a fiber-form portion in which the constituent fibers of the outer casing 103 remain. Therefore, the appearance is also beautiful, and the touch of the skin is improved.

The diaper 101 including the pair of side seal portions 104 and 104 obtained by the step of dividing and welding the outer casing 103 at the same time, the side seal portion 104 is excellent in flexibility and skin feel. Good wearing.

Next, the third invention will be described with reference to Fig. 21 . The description of the first invention and the second invention will be appropriately applied to the third aspect of the invention. In addition, in FIG. 21, the same members as those in FIGS. 1 to 20 are denoted by the same reference numerals.

The third invention relates to a pant type disposable diaper which is less likely to cause a transverse crack of the side seal portion, and can be easily and smoothly removed after use. The pants-type disposable diaper according to the third aspect of the 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 that of the pants-type disposable diaper according to the second aspect of the invention. Therefore, the description of the pants-type disposable diaper of the third invention will be described here centering on the structure of the side seal portion 104.

In the pant-type disposable diaper according to the third aspect of the invention, as shown in FIGS. 15 and 21, the fusing portion 140 in the sealing edge portion 141 is attached to the self-diaper 101 on a cross section orthogonal to the direction in which the side sealing portion 104 extends. The direction in which the side of the wearer's skin is closer to the side of the wearer's skin is the inner and outer direction P, and when the direction orthogonal to the inner and outer directions P is the thickness direction Q, both end portions 104a and 104b of the thickness direction Q are The distance Dw between the end portions 104a and 104b which is closest to the inner end portion 104c of the wearer's skin in the inner and outer directions P is the inner end portion 104c and the opposite portion 104d' of the outer edge 104d of the fusion portion. The distance between the inner and outer directions P is more than Dc.

The distance Dw between the 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. Further, in the case where the position of the end portion 104a on the side of the front piece 101A is different from the position of the end portion 104b on the side of the back piece 101B in the inner and outer directions P, it is preferable that the distance Dw with respect to each is the distance Dc. the above.

Further, the distance Dc is a distance between the inner end portion 104c and the outer edge 104d of the fusing portion and the portion 104d' facing the inner end portion 104c in a line parallel to the inner and outer directions P. The portion 104d' facing the inner end portion 104c is a portion where the straight line parallel to the inner and outer directions P of the inner end portion 104c intersects with the outer edge 104d of the fusion portion 140.

Further, in the side seal portion 104 of the diaper 101 of the present embodiment, the melting in the thickness direction Q The position of the inner end portion 104c of the joint portion 140 is located at a central position which is equally divided between the position in the thickness direction Q between the position of the end portion 104a on the side of the front piece 101A and the position of the end portion 104b on the side of the back piece 101B. However, the inner end portion 104c in the present invention may exist at a position shifted from the center position toward the one end portion 104a, 104b side.

The distance Dw, the distance Dc, and the thickness Tc described below can be measured as follows.

[Method for Measuring Distance Dw, Distance Dc, and Thickness Tc]

The distance Dw, the distance Dc, and the thickness Tc were measured by a microscope (VHX-1000 manufactured by KEYENCE Co., Ltd.) at a magnification of 50 times to 200 times, and the measurement was performed without applying a load.

The distance Dw, the distance Dc, and the thickness Tc are respectively measured on the cross sections of the three different portions along the direction of the side seal portion 104, and the average value of the measured values is set to each value.

The size of each part is preferably measured to a unit of 0.01 mm.

When the distance Dw of the fusion portion 140 is equal to or greater than the above-described distance Dc, it is possible to reliably prevent the occurrence of a transverse crack when the side seal portion is torn. Further, since it is difficult to cause a transverse crack in the side seal portion, the diaper 101 of the present embodiment can be easily and smoothly removed after use.

The inventors of the present invention conducted a tearing test of the side seal portion by using a plurality of pants-type disposable diapers in which the side seal portions were formed by the irradiation of the laser light, and as a result, it was found that the side seal portions 104 were in the inner and outer directions P described above. The portion H outside the inner end portion 104c is more likely to be broken than the portion G on the inner side of the inner end portion 4c, particularly the portion of the outer portion H where the fusion portion 140 and the outer body 103 remain. The boundary portion 104e or the fusion portion 140 is likely to be broken.

In the present embodiment, the fusion portion having the distance Dw equal to or greater than the distance Dc is formed, and the cross-sectional area of the portion H outside the inner end portion where the fracture is likely to occur is increased, whereby the tearing of the side seal portion can be increased. The probability of occurrence of fracture at or near the fusion portion 140 is significant It is suppressed that a transverse crack occurs when the side seal portion is torn.

The distance Dw is preferably larger than the distance Dc from the viewpoint of further surely preventing the lateral crack of the side seal portion 104. Further, the distance Dw is preferably 1.3 times or more of the distance Dc, more preferably 2.0 times or more, still more preferably 3.0 times or more, further preferably 8.0 times or less, further preferably 4.0 times or less, and further preferably Preferably, it is 1.3 to 8.0 times, and more preferably 2.0 to 4.0 times.

Further, in the inner and outer direction P, the side seal portion is judged by whether or not the portion H outside the inner end portion 104c is more likely to be broken than the portion G on the inner side of the inner end portion 104c.

In other words, the side seal portion 104 and the vicinity of both sides thereof were cut into a short strip shape 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 was located at the center, and a sample was obtained. A tension tensile tester (manufactured by ORIENTEC Co., Ltd., trade name "RTA-100") was used for the obtained sample, and the end portion of the body side and the back body side of the sample were grasped at a tensile speed of 300 mm/min. Stretched in the opposite direction of 180 degrees. Furthermore, this test was performed on each of the side seal portions on the 5-point sample.

Regarding each of the five-point samples, it was investigated whether the fracture position was the portion H outside the inner end portion 104c or the portion G inside the inner end portion 104c, and the number of samples broken at the outer portion H was larger than that at the inner portion G. In the case of the number of samples of the fracture, it is determined that the portion H outside the inner end portion 104c is more likely to be broken than the portion G on the inner side of the inner end portion 104c, and the number of samples broken at the inner portion G is larger than that at the outer portion. In the case of the number of samples in which H is broken, it is determined that the portion G on the inner side of the inner end portion 104c is more likely to be broken than the portion G on the outer side of the inner end portion 104c.

Further, in the disposable diaper according to the present embodiment, the thickness of the outer body of the front body piece and the back body piece is smaller than the thickness of the portion H outside the inner end portion 104c, which is smaller than the inner side end portion 104c. thickness. Thereby, the probability of occurrence of breakage at or near the fusion portion 140 when the side seal portion is torn is increased, and the occurrence of the transverse crack when the side seal portion is torn is remarkably suppressed. After that. The thickness of the portion G on the inner side of the thickness of the portion H outside the inner end portion 104c of the front piece and the back piece can be measured in the same manner as the distance Dw, the distance Dc, and the thickness Tc.

In the diaper 101 of the present embodiment, the outer edge 104d of the fusion portion 140 has a shape that is recessed toward the inner side in the inner and outer directions P. Therefore, the distance Dw can be easily made equal to or greater than the above-described distance Dc, and the visibility of the fused portion 140 in the worn state of the diaper 101 can be lowered, and the appearance of the diaper 101 is close to that of the undergarment. Further, since the flexibility of the fusion portion is improved, the skin feel of the diaper 101 becomes softer.

Further, in the diaper 101 of the present embodiment, the distance Dw is equal to or greater than the thickness Tc of the fusion portion 140 at the center position where the distance Dw is equally divided. In the present invention, the distance Dw is not necessarily the thickness Tc or more. However, by setting the distance Dw to be equal to or greater than the thickness Tc, the cross-sectional area of the portion H which is more likely to be broken than the inner end portion 104c can be increased. Further, it is possible to further increase the possibility of occurrence of breakage in the vicinity of the tearing of the side seal portion 104, so that the occurrence of a transverse crack can be further surely suppressed.

The distance Dw is preferably more than 5% of the thickness Tc, more preferably 10% or more, from the viewpoint of further preventing the lateral crack of the side seal portion 104, and the distance is from the viewpoint of flexibility. Dw is preferably 50% or less of the above thickness Tc, more preferably 30% or less, and still more preferably 5% or more and 50% or less, more preferably 10% or more and 30% or less.

Each of the distance Dw of the fusion portion 140 and the distance Dc of the fusion portion 140 is preferably smaller from the viewpoint of improvement in flexibility or touch of the side seal portion 104, and is preferably 2.0 mm, for example. Hereinafter, it is more preferably less than 1.0 mm. On the other hand, in terms of securing the sealing strength, it is preferably 0.05 mm or more.

Further, the reason why the thickness Tc of the fusion portion 140 is measured at a central position at which the distance Dw of the fusion portion 140 is equally divided is that the thickness can be measured in accordance with the samples for various samples having a sealed shape.

Further, the outer edge 104d of the fusion portion 140 has a shape that is largely recessed toward the inner side in the inner and outer directions P, and is formed in a portion where the outer edge 104d is located further inside the line than the distance Dw of the fusion portion 140. The thickness Tc is set to a thickness including the thickness of the space portion on the inner side of the halved line.

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

Specifically, in the first invention described above, the technical elements of the third invention can be employed in the side seal portion 104. For example, the side seal portion 104 of the pants-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. Further, in the fusion portion 141, the distance Dw between the both end portions in the thickness direction Q and the inner end portion of the wearer's skin closest to the inner and outer directions P between the both end portions becomes the inner end portion and the fusion portion 140. The distance between the opposite portions of the edge is greater than or equal to the distance Dc in the inner and outer directions P. Moreover, in a preferred embodiment of the pant-type disposable diaper 101, the side seal portion 104 extends straight along the longitudinal direction X of the diaper 101 in a state in which the diaper 101 is worn before the diaper 101 is worn. And extending in the longitudinal direction of the diaper 101 in a worn state.

The pants-type disposable diaper 101 of the third invention can be preferably produced by the same method as the pants-type disposable diaper of the second invention. In the diaper 101 manufactured by this method, a sealing edge portion 141 is formed in the side seal portion 104, and the sealing edge portion 141 is formed in the front piece F by a continuous linear fusing portion 140 extending in the longitudinal direction of the side sealing portion. The edge portion A1 of the outer casing 103 is combined with the edge portion B1 of the outer casing 103 in the back body piece R.

Further, in order to obtain the sealing edge portion 141 (side sealing portion 104) having the above-described distance Dw of the fusion portion 140 having the above-described distance Dc or more, it is preferable to pressurize the vicinity of the divided portion 110C facing the diaper continuous body 110. While the laser beam is irradiated, the laminated body in a state in which the fibers at the cut ends are melted is transported while being maintained in the pressurized state, and the pressurized state is released after the molten resin is solidified. The sealing edge portion 141 obtained in this way is worn and worn In the cross section orthogonal to the direction in which the side seal portion 104 is extended, the outer edge 104d of the fusion portion 140 is recessed toward the inner side of the diaper 101. In view of promoting the curing of the molten resin, it is preferred that the diaper continuous body is brought into contact with a metal member having excellent thermal conductivity at least on one side, or pressurized, or cooled by an air device or the like.

Further, in order to obtain the sealing edge portion 141 (the side sealing portion 4) having the above-described distance Dw of the fusion portion 140 having the above-described distance Dc or more, it is preferable to increase the laser intensity and increase the laser output so as to increase the scanning speed. Slow down.

Further, as shown in Fig. 21, the sealing edge portion 141 of the diaper 101 obtained by the above-described manufacturing method is further outside the relatively fused portion 140 in the inner and outer directions P, and the constituent fibers not having the outer casing 103 have a fiber shape. Part of it. Therefore, the visibility of the fusing portion 140 in the worn state of the diaper 101 can be lowered, and the appearance of the diaper 101 is close to that of the underpants.

Hereinabove, the present invention has been described based on preferred embodiments thereof, but the present invention is not limited to the above embodiments. For example, in the above-described embodiment, as a preferred method of manufacturing the side seal portion, a fuse using laser light as shown in FIG. 6 is taken as an example, but the method of manufacturing the side seal portion is not limited thereto, and other methods may be employed. For example, a heat sealing method, an ultrasonic sealing method, a high frequency sealing method, a bonding method using an adhesive, and the like.

Further, the diaper-based absorbent main body 5 of the first aspect of the invention spans between the front side sheet member 6A and the back side sheet member 6B, but a pants-type disposable diaper of the following form may be applied to the first According to the invention, the pants-type disposable diaper includes: an exterior sheet having a shape in which a side edge extending in the longitudinal direction is curved toward a laterally inner side in a central portion of the longitudinal direction; and a pair of side seal portions, which are disposed on the exterior The absorptive main body of the inner surface of the sheet is formed by joining the side edges of the side portions of the front side portion of the outer sheet and the side edges of the back side portion.

Further, the front and back side sheet members 6A and 6B may have two sheets, three sheets or more sheets stacked in addition to the four sheets stacked as shown in Fig. 7(a). By.

In the second and third inventions, as shown in FIG. 17, the exterior body 103 is not in the abdominal side portion 101A. The back side portion 101B is divided into a continuous shape such as an hourglass shape extending over the front side portion 101A, the lower portion 101C, and the back side portion 101B. The outer casings of the second and third inventions are not limited to such a continuous shape. Further, as in the first invention, for example, the abdominal sheet member disposed on the front side (front side) of the wearer and the back side sheet member disposed on the back side (rear side) of the wearer may be absorbed. The body is erected and fixed to the two sheet members. The above-described superimposition and pressurization step in the method for producing a pant-type disposable diaper having such a divided outer casing is such that the belt-shaped outer casing having the absorbent body is fixed before the body side (belt-shaped ventral sheet) The predetermined portion where the side seal portion is formed in the strip-shaped outer casing having the structure in which the member is overlapped with the back body sheet side (the belt-shaped back side sheet member) is in a pressurized state.

Further, in the second and third inventions, before the superposition and pressurization step, as shown in Fig. 18, both side portions 103a and 103a of the belt-shaped outer casing 103 in the transport direction, that is, strip outer layers are formed. The both sides of the sheet 131 and the strip-shaped inner layer sheet 132 are folded back so as to cover both ends in the longitudinal direction of the absorbent body 102, but the width direction (orthogonal to the longitudinal direction) may be used. The direction of the inner layer sheet 132 is longer than the strip-shaped inner layer sheet 132. When the two sheets 131 and 132 are overlapped, only the side edges of the inner layer sheet 132 are extended outward. The extended portion of the material 131 is folded back so as to cover both end portions of the absorbent body 102 in the longitudinal direction. In this case, in the divided portion 110C of the diaper continuous body 110, the opening end portion of the waist opening portion 108 and the vicinity thereof are a six-layer structure portion in which six sheets are overlapped, and the other portions are overlapped with four sheets. The 4-layer structure of the material. Further, the both side portions 103a and 103a of the belt-shaped outer casing 103 in the conveying direction, that is, the strip-shaped outer layer sheet 131 and the strip-shaped inner layer sheet 132 may not be located on both sides in the conveying direction. fold.

Further, in the embodiment of the second invention shown in Fig. 18, the uneven portions 143 and 143 are formed on both sides of the side seal portion 104, but they may be formed only on one side. Further, the elastic stretchable portion 144 as shown in FIG. 18 may not be provided on the outer side of the uneven portion 143. For example, the uneven portion 143 may extend over the entire region of the pair of side seal portions 104, 104 or the side seal portion 104 and the side of the absorbent body 102. The entire area between the edges exists.

Further, the first to third inventions relate to pant-type disposable diapers, but the inventions are not limited to pants-type disposable diapers, and may be pants-type articles, such as pants-type menstrual napkins, and A diaper cover or the like which does not have an absorbent body on the other hand may be provided on the outer surface of the wearable article.

The description of the above-described embodiments and the requirements of only one embodiment can be appropriately applied to other embodiments, and the requirements of the respective embodiments can be replaced with each other as appropriate.

In the above embodiment, the present invention further discloses the following pants-type disposable diaper.

<1>

A pant type disposable diaper comprising a crotch portion, a front side portion and a back side portion extending from the lower portion of the crotch portion, and side edges of the side portions and the side edges of the back side portion respectively One of the pair of side seal portions and having a longitudinal direction corresponding to the front and rear direction of the wearer and a transverse direction orthogonal thereto, and the side seal portion is in a state of wearing the diaper before the wearing of the diaper It extends straight along the longitudinal direction of the diaper and extends in the longitudinal direction of the diaper in a worn state.

<2>

The pants-type disposable diaper according to <1>, wherein the width of the side seal portion in the lateral direction is preferably 1 mm or more, more preferably 2 mm or more, and more preferably 30 mm or less, further preferably 20 mm or less.

<3>

The pant-type disposable diaper according to <1> or <2>, wherein the side seal portion has a joint portion extending in a longitudinal direction of the diaper, and a non-joining portion is not present on a lateral side of the joint portion from a lateral direction of the diaper.

<4>

The pant-type disposable diaper according to any one of the above aspects, wherein the elastic member extending in the lateral direction of the diaper is vertically spaced apart from the longitudinal direction of the diaper in both the front side portion and the back side portion One or more of the elastic members of at least one of the front side portion and the back side portion are disposed at an interval and in an extended state, and one end portion of the elastic member reaches the side seal portion or the vicinity thereof, and is observed along the longitudinal direction of the diaper. The position of the elastic member disposed on the front side portion of the side seal portion at the end portion of the side seal portion does not coincide with the position of the end portion of the elastic member disposed on the back side portion of the side seal portion.

<5>

The pants-type disposable diaper according to <4>, wherein the elastic member disposed on the back side portion is at an end portion of the side seal portion, and is located in the front side portion of the diaper in the longitudinal direction of the diaper. Two of the adjacent elastic members are located substantially at an intermediate position of the end of the side seal portion.

<6>

The pants-type disposable diaper according to <4> or <5>, wherein the elastic member disposed on the front side portion is at an end portion of the side seal portion, and is located in the back side portion in the longitudinal direction of the diaper The two elastic members adjacent to each other are spaced apart from each other at a substantially intermediate position of the position of the end portion of the side seal portion.

<7>

The pants-type disposable diaper according to any one of the aspects of the present invention, wherein the elastic member disposed on the front side portion has an end portion of the side seal portion and the elastic member disposed on the back side portion The end portions of the side seal portions are alternately present in the longitudinal direction of the side seal portions.

<8>

The pants-type disposable diaper according to any one of the aspects of the present invention, wherein the interval between the two elastic members adjacent to each other in the longitudinal direction and spaced apart from the front side portion is disposed on the back side The interval between two adjacent elastic members adjacent to each other in the longitudinal direction Roughly the same.

<9>

The pants-type disposable diaper according to any one of the aspects of the present invention, wherein the back side portion is disposed at an interval between the two elastic members adjacent to each other in the longitudinal direction, and is disposed on the back The interval between the two elastic members adjacent to each other in the longitudinal direction is preferably 2 mm or more, more preferably 4 mm or more, and is preferably 20 mm or less, and further preferably 15 mm or less.

<10>

The pant-type disposable diaper according to any one of <1> to <9> wherein the side seal portion is formed by a relatively straight joint portion including a continuous line extending in the longitudinal direction of the diaper.

<11>

The pant-type disposable diaper according to any one of <1> to <10> wherein the side seal portion is formed by a relatively straight joint portion including a continuous line extending in the longitudinal direction of the diaper, the joint portion The width is preferably 0.01 mm or more, more preferably 0.1 mm or more, and is preferably 3 mm or less, and further preferably 2 mm or less.

<12>

The pants-type disposable diaper according to any one of <1> to <11, wherein the thickness of the side seal portion is preferably 0.2 mm or more, more preferably 0.25 mm or more, and preferably 2 mm or less, and further Good for 1.5mm or less.

<13>

The pant-type disposable diaper according to any one of the above aspects, wherein the elastic member disposed on the front side portion of the diaper is at a position of an end portion of the side seal portion when viewed in a longitudinal direction of the diaper The elastic member disposed on the back side portion has substantially the same position at the end portion of the side seal portion, and the plurality of elastic members disposed on the front side portion of the elastic member have relatively long elongation stress a high ventral high elongation stress elastic member 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 being alternately arranged along a longitudinal direction of the diaper, The plurality of elastic members disposed on the back side portion include 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 members are alternately arranged along the longitudinal direction of the diaper, and the position of the ventral high elongation stress elastic member substantially coincides with the position of the back side low elongation stress elastic member when viewed in the longitudinal direction of the diaper, and The position of the ventral low elongation stress elastic member is substantially the same as the position of the back side high elongation stress elastic member, and the ventral high elongation stress elastic member has a relatively higher elongation stress than the back side low elongation stress elastic member, and the back is The elongation stress of the laterally high elongation stress elastic member is relatively higher than the above ventral low elongation stress elastic Member.

<14>

a pants-type disposable diaper according to <13>, wherein the ventral high-elongation stress elastic member substantially conforms to an elongation stress of the back side high-elongation stress elastic member, and the ventral low-elongation stress elastic member has a low elongation with the back side The elongation stress of the stress elastic member is approximately the same.

<15>

The pant-type disposable diaper according to <13> or <14>, wherein the elongation stress is different by making the thickness of the elastic member different.

<16>

The pant-type disposable diaper according to <13> or <14>, wherein the elongation stress is different by different degrees of the stretched state of the elastic member.

<17>

The pant-type disposable diaper according to any one of the above aspects, wherein the thickness of the side seal portion is adjacent to the side seal portion of each of the front side portion and the back side portion constituting the side seal portion The thickness of the part becomes larger.

<18>

The pants-type disposable diaper according to any one of <1> to <17>, which has a rectangular-shaped rectangular sheet member disposed on the ventral side of the wearer and disposed on the back side of the wearer. a rectangular-shaped back side sheet member, and an absorbent body erected to the front side sheet member and the back side sheet member, and by positioning the upper side of the front side sheet member with the back The position of the upper side of the side sheet member is different, and a step is provided on the upper portion of the side seal portion.

<19>

The pants-type disposable diaper according to any one of <1> to <17>, which has a rectangular-shaped rectangular sheet member disposed on the ventral side of the wearer and disposed on the back side of the wearer. a long rectangular back side sheet member, and an absorbent body erected to the front side sheet member and the back side sheet member, and by positioning the lower side of the front side sheet member with the back The position of the lower side of the side sheet member is different, and a step is provided at the lower portion of the side seal portion.

<20>

The pants-type disposable diaper according to any one of <1> to <17>, which has a rectangular-shaped rectangular sheet member disposed on the ventral side of the wearer and disposed on the back side of the wearer. a rectangular member having a rectangular shape, and an absorbent body that is fixed to the abdominal sheet member and the back sheet member, and a position of the upper side of the front side sheet member and the back sheet The upper side of the member has the same position, and a notch, which is a notch of a wedge shape, is provided on the upper portion of the side seal portion.

<21>

A pant type disposable diaper according to any one of <1> to <17>, which is configured to be worn a rectangular-shaped ventral side sheet member having a horizontally long side on the ventral side of the author, a horizontally-shaped rectangular back-side sheet member disposed on the back side of the wearer, and erected and fixed to the ventral sheet member and the back An absorbent body of the side sheet member, wherein a position of a lower side of the front side sheet member is the same as a position of a lower side of the back side sheet member, and a notch portion having a wedge-shaped notch portion is provided at a lower portion of the side seal portion.

<22>

The pant-type disposable diaper according to any one of <1> to <21>, further comprising an outer surface of the outer surface of the diaper, wherein the side seal portion has a sealing edge portion, and the sealing edge portion is used along the a continuous linear fusing portion extending in the longitudinal direction of the side seal portion is formed by combining an edge portion of the outer casing in the front side portion with an edge portion of the outer casing in the back side portion, and the fusion portion is In the cross section orthogonal to the direction in which the side seal portion extends, the length from the side of the diaper that is closer to the wearer's skin toward the side farther from the wearer's skin is defined as the width W, and the center position of the width W is set. When the length in the direction orthogonal to the direction is the thickness T, the thickness T of the fusion portion is the same as the total thickness of the outer casing on the side of the front side and the outer body on the side of the back side. Or a smaller thickness, and the thickness T of the fusion portion is larger than a thickness of at least one of the outer casing on the side of the front side portion and the outer casing on the side of the back side portion.

<23>

The pants-type disposable diaper according to <22>, wherein the thickness T of the fusion portion is larger than a thickness of any one of the front side outer casing and the back side outer casing.

<24>

The pants-type disposable diaper of <22> or <23>, wherein the width W of the fusion portion is smaller than the thickness T of the fusion portion.

<25>

The pants-type disposable diaper according to any one of <22>, wherein the thickness T of the fusion portion is greater than the total thickness of the outer side of the front side portion and the outer side of the back side portion. The ratio (%) of (Ta + Tb) is preferably 100% or less, further preferably 95% or less, and more preferably 30% or more, and still more preferably 50% or more.

<26>

The pants-type disposable diaper according to any one of the aspects of the present invention, wherein the total thickness (Ta+Tb) of the ventral side outer casing and the back side outer casing is fused with the above The difference in thickness T of the portion (Ta + Tb - T) is preferably 0.00 mm or more, more preferably 0.02 mm or more, and is preferably 0.25 mm or less, and further preferably 0.20 mm or less.

<27>

The pant-type disposable diaper according to any one of <22>, wherein the thickness T of the fusion portion is opposite to the thickness Ta of the outer side of the front side portion and the side of the back side portion The ratio (%) of each of the thicknesses Tb of the body is preferably 110% or more, more preferably 150% or more, and is preferably 300% or less, and further preferably 200% or more.

<28>

The pants-type disposable diaper according to any one of <22>, wherein the thickness T of the fusion portion and the thickness Ta of the outer side of the front side portion and the outer side of the back side portion The difference (T-Ta, T-Tb) of each of the thicknesses Tb is preferably 0.05 mm or more, more preferably 0.10 mm or more, and is preferably 2.00 mm or less, and further preferably 1.00 mm or less.

<29>

The pants-type disposable diaper according to any one of the above aspects, wherein the width W of the fusion portion is preferably 95% or less, more preferably 50% or less, and more preferably 10% or more, further preferably 30% or more.

<30>

A pant type disposable diaper according to any one of <22> to <29> wherein the above fusion The width W of the portion is preferably 2.0 mm or less, more preferably less than 1.0 mm, and still more preferably less than 0.3 mm.

<31>

The pants-type disposable diaper according to any one of the aspects of the present invention, wherein the at least one of the ventral side outer casing and the back side outer casing are at the same as the side seal The adjacent portion is formed with a concavo-convex region in which the transverse cross-sectional shape is continuously deformed by contraction of the elastic member disposed in the outer casing, and in the worn state, the thickness T of the fusion portion is smaller than the uneven portion. Amplitude height.

<32>

In the pants-type disposable diaper according to <31>, the thickness T of the fusion portion is preferably 70% or less, more preferably 50% or less, still more preferably 20% or less of the amplitude of the uneven portion.

<33>

The pant-type disposable diaper according to any one of <22>, wherein the sealing edge portion is outside the fusion portion in the inner and outer directions, and the fiber having no outer body has a fiber shape. section.

<34>

The pants-type wearing article according to any one of <22>, further comprising a waist opening portion and a pair of leg opening portions, wherein the sealing edge portion is provided between the waist opening portion and the leg opening portion It is formed in full length.

<35>

The pants-type disposable diaper according to any one of <22>, wherein the width W of the fusion portion is less than 0.3 mm, and the thickness T of the fusion portion is 0.3 mm or more.

<36>

The pants-type disposable diaper according to any one of <1> to <35, wherein the fused portion is on a side of the diaper that is close to the wearer's skin in a cross section orthogonal to the direction in which the side seal portion extends. The direction toward the side away from the wearer's skin is the inner-outer direction P, and when the direction orthogonal to the inner-outer direction P is the thickness direction Q, the two ends of the thickness direction Q are the closest to the wearer. The distance Dw between the inner end portions of the skin in the inner and outer directions P is equal to or greater than the distance Dc between the inner end portion and the opposing portion of the outer edge of the fusion portion in the inner and outer directions P.

<37>

The diaper-type disposable diaper according to <36>, wherein the distance Dw between the end portions of the fusion portion and the end portions of the end portion on the side of the front side portion and the end portion on the side of the back side portion It is above the above distance Dc.

<38>

A pant type disposable diaper according to <36> or <37>, wherein said distance Dw is greater than said distance Dc.

<39>

The pants-type disposable diaper according to any one of <36>, wherein the distance Dw is preferably 1.3 times or more, more preferably 2.0 times or more, still more preferably 3.0 times or more, of the distance Dc. It is preferably 8.0 times or less, more preferably 4.0 times or less, still more preferably 1.3 to 8.0 times, still more preferably 2.0 to 4.0 times.

<40>

The pant-type disposable diaper according to any one of <36>, wherein the outer edge of the fusion portion has a concave toward the inner side in the inner and outer directions on a cross section orthogonal to a direction in which the side seal portion extends. The shape.

<41>

The pant-type disposable diaper according to any one of <36>, wherein the distance Dw is equal to or greater than a thickness Tc of the fusion portion at a central position at which the distance Dw is equally divided.

<42>

The pants-type disposable diaper according to any one of <36>, wherein the distance Dw is preferably more than 5%, more preferably 10% or more, and the distance Dw is preferably the thickness. 50% or less of Tc, more preferably 30% or less.

<43>

The pant-type disposable diaper according to any one of <36>, wherein the side seal portion is more outward than the inner end portion in the inner and outer directions. The part is easily broken.

<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 portion is preferably 2.0 mm or less, more preferably less than 1.0 mm.

<45>

The pants-type disposable diaper according to any one of <36>, wherein the distance Dw and the distance Dc of the fusion portion are each preferably 2.0 mm or less, more preferably less than 1.0 mm.

<46>

The pant-type disposable diaper according to any one of <36> to <45> wherein the distance Dw is 0.05 mm or more.

<47>

The pant-type disposable diaper according to any one of <36>, wherein the thickness of the front side portion and the back side portion in the inner and outer directions is smaller than a thickness of a portion outside the inner end portion. The thickness of the inner side of the inner end portion.

<48>

The pant-type disposable diaper according to any one of <36>, wherein the sealing edge portion is on the outer side of the fusion portion in the inner and outer direction P, and does not have the constituent fiber of the outer casing. A portion of the fiber shape remains.

<49>

A pants-type wearing article comprising: a cover body forming an outer surface of the wearing article, and forming a side edge portion of the outer body of the front body piece and a side edge portion of the outer body of the back body piece to form a side edge portion a side seal portion, a waist opening portion, and a pair of leg portion opening portions, wherein the side seal portion has a sealing edge portion that is formed by a continuous linear fusing portion extending along a longitudinal direction of the side seal portion The edge portion of the outer casing of the sheet is combined with the edge portion of the outer body of the back body sheet, and the fusion portion is close to the wearing article in a cross section orthogonal to the direction in which the side seal portion extends. The length of the inner side of the wearer's skin facing the side of the wearer's skin is the width W, and when the length of the center of the width W in the direction orthogonal to the direction is the thickness T, the fusion portion is The thickness T is the same as or smaller than the total thickness of the front body side outer casing and the rear body side outer casing, and the thickness T of the fusion portion is larger than the front body side outer casing and the rear body side outer casing. The thickness of at least one of them.

<50>

The pants-type wearing article according to <49>, wherein the thickness T of the fusion portion is larger than a thickness of any one of the front body side outer body and the back body side outer body.

<51>

The pants-type wearing article of <49> or <50>, wherein the width W of the fusion portion is smaller than the thickness T of the fusion portion.

<52>

The pants-type wearing article according to any one of <49>, wherein the thickness T of the fusion portion is greater than a total thickness (Ta+Tb) of the outer body side outer body and the back body side outer body. The ratio (%) is preferably 100% or less, more preferably 95% or less, and is preferably 30% or more, and further preferably 50% or more.

<53>

The pants-type wearing article according to any one of <49> to <52, wherein a difference between the total thickness (Ta+Tb) of the front body side outer body and the back body side outer body and the thickness T of the fusion portion is (Ta + Tb - T) is preferably 0.00 mm or more, further preferably 0.02 mm or more, and more preferably 0.25 mm or less, further preferably 0.20 mm or less.

<54>

The pants-type wearing article according to any one of <49>, wherein the thickness T of the fusion portion is different from the thickness Ta of the outer body side outer casing and the thickness Tb of the rear body side outer casing. The ratio (%) is preferably 110% or more, more preferably 150% or more, and is preferably 300% or less, and further preferably 200% or more.

<55>

The pants-type wearing article according to any one of the items of the present invention, wherein the thickness T of the fusion portion and the thickness Ta of the outer body side outer casing and the thickness Tb of the rear body side outer casing are each The difference (T-Ta, T-Tb) is preferably 0.05 mm or more, more preferably 0.10 mm or more, and is preferably 2.00 mm or less, and further preferably 1.00 mm or less.

<56>

The pants-type wearing article according to any one of the items <49>, wherein the width W of the fusion portion is preferably 95% or less of the thickness T, more preferably 50% or less, and preferably 10 More than %, more preferably 30% or more.

<57>

The pants-type wearing article according to any one of <49>, wherein the width W of the fusion portion is preferably 2.0 mm or less, more preferably less than 1.0 mm, and still more preferably less than 0.3 mm.

<58>

The pants-type wearing article according to any one of <49> to <57> wherein at least one of the front body side outer body and the back body side outer body is adjacent to the side seal portion a concave-convex region in which a transversely-shaped cross-sectional shape is continuously deformed by contraction of an elastic member disposed in the exterior body, and the thickness T of the fusion portion is smaller than an amplitude height of the concave-convex region in a worn state. .

<59>

In the pants-type wearing article of the <58>, the thickness T of the fusion portion is preferably 70% or less, more preferably 50% or less, still more preferably 20% or less of the amplitude of the uneven portion.

<60>

The trouser-type wearing article according to any one of <49>, wherein the sealing edge portion is outside the fusion portion in the inner and outer directions, and the fiber having no fiber shape is left in the constituent fiber of the outer casing .

<61>

The pants-type wearing article according to any one of <49>, wherein the sealing edge portion is formed over the entire length between the waist opening portion and the leg opening portion.

<62>

The pants-type wearing article according to any one of <49>, wherein the width W of the fusion portion is less than 0.3 mm, and the thickness T of the fusion portion is 0.3 mm or more.

<63>

A pants-type wearing article comprising: a cover body forming an outer surface of the wearing article, and forming a side edge portion of the outer body of the front body piece and a side edge portion of the outer body of the back body piece to form a side edge portion a side seal portion, a waist opening portion, and a pair of leg portion openings, wherein the side seal portion includes a seal edge portion that is a front portion by a continuous linear fusion portion extending in a longitudinal direction of the side seal portion The edge portion of the outer casing of the sheet is combined with the edge portion of the outer body of the back body sheet, and the fusion portion is close to the wearing article in a cross section orthogonal to the direction in which the side seal portion extends. The side of the wearer's skin is oriented away from the side of the wearer's skin. In the inner and outer directions P, when the direction orthogonal to the inner and outer directions P is the thickness direction Q, the inner and outer directions between the end portions of the thickness direction Q and the inner end portions of the wearer's skin closest to the wearer's skin The distance Dw of P is equal to or greater than the distance Dc between the inner end portion and the opposing portion of the outer edge of the fusion portion in the inner and outer directions P.

<64>

In the trouser-type wearing article of the <63>, the distance Dw between the end portions of the thickness portion Q of the fusion portion and the end portion of the front piece side and the rear body piece side is equal to or greater than the distance Dc.

<65>

A pants-type wearing article such as <63> or <64>, wherein the distance Dw is greater than the distance Dc.

<66>

The pants-type wearing article according to any one of <63>, wherein the distance Dw is preferably 1.3 times or more, more preferably 2.0 times or more, still more preferably 3.0 times or more, and more preferably 3.0 times or more. It is preferably 8.0 times or less, more preferably 4.0 times or less, still more preferably 1.3 to 8.0 times, still more preferably 2.0 to 4.0 times.

<67>

The pants-type wearing article according to any one of <63>, wherein the outer edge of the fusion portion has a concave toward the inner side in the inner and outer directions on a cross section orthogonal to a direction in which the side seal portion extends. shape.

<68>

The pants-type wearing article according to any one of <63>, wherein the distance Dw is equal to or greater than a thickness Tc of the fusion portion at a central position at which the distance Dw is equally divided.

<69>

The pants-type wearing article according to any one of <63> to <68, wherein the distance Dw is preferably more than 5%, more preferably 10% or more, and the distance Dw is preferably more than 10%. It is 50% or less of the above thickness Tc, and more preferably 30% or less.

<70>

The pants-type wearing article according to any one of <63>, wherein the side seal portion is in the inner and outer directions, and a portion outside the inner end portion is located further inward than the inner end portion. Easy to break.

<71>

The pants-type wearing article according to any one of <63> to <70, wherein the distance Dw or the distance Dc of the fusion portion 40 is preferably 2.0 mm or less, more preferably less than 1.0 mm.

<72>

The pants-type wearing article according to any one of <63> to <71>, wherein the distance Dw and the distance Dc of the fusion portion 40 are each preferably 2.0 mm or less, more preferably less than 1.0 mm.

<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 pants-type wearing article according to any one of <63>, wherein the thickness of the front body piece and the back body piece in the inner and outer directions is smaller than a thickness of a portion of the outer side of the inner end portion. The thickness of the inner part of the part.

<75>

The pants-type wearing article according to any one of <63>, wherein the sealing edge portion is located outside the fusion portion in the inner and outer direction P, and the fiber having no fiber shape is left in the constituent fiber of the outer casing .

<76>

The pants-type wearing article of any one of <63> to <75>, wherein the pants-type wearing article is a pant-type disposable diaper.

[Examples]

Hereinafter, the present invention will be specifically described by way of examples, but the present invention is not limited to the examples.

[Example 1]

According to the manufacturing method shown in Fig. 20, a pants-type disposable diaper having the same basic configuration as that of the diaper 101 shown in Figs. 14 to 16 was produced. As the absorbent body, an absorbent body of a commercially available pant-type disposable diaper (Merries pants manufactured by Kao, manufactured in 2012) is used as the outer layer sheet 131 and the inner layer sheet 132 which constitute the outer body. A spunbonded nonwoven fabric having a basis weight of 17 g/m ² of a single fiber containing PP was used. In the manufacture of the diaper of the first embodiment, laser light is used as a fuse device of the diaper continuous body (continuous body continuous laminate), and the predetermined portion of the side seal portion in the diaper continuous body is irradiated with laser light to be melted. Thereby, a side seal portion is formed. The irradiation of the laser light is performed using a device having the same configuration as that of the laser-type bonding device shown in Fig. 6. As the laser light, a CO ₂ laser was used, and the laser output was set to 24 W and the scanning speed was 325 mm/s.

[Comparative Example 1]

In the manufacture of the diaper, instead of using the melting of the laser light, the heat sealing using the heating and pressing device (hot rolling device) and the physical sealing of the heat sealing portion (pressed portion) are used to cut off the device. A pants-type disposable diaper was produced in the same manner as in Example 1 except that the side seal portions were formed by the devices.

[Comparative Example 2]

In the same manner as 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 fusion portion formed by the heating and pressing device (hot rolling device) was changed.

[assessment]

With respect to the diapers of the respective examples and comparative examples, the tactile sensations of the side seal portions were evaluated by the following methods, respectively. The results are shown in Table 1 below.

[Touch of the side seals]

Eight functional inspectors were asked to touch the side seals of the diaper of the evaluation object with the index finger, and the feeling at this time was evaluated based on the following evaluation criteria. The average score of 20 functional inspectors was taken as the evaluation result of the diaper.

<Evaluation criteria for the tactile sensation of the side seals>

5 points: soft.

4 points: slightly soft.

3 points: Unable to judge.

2 points: slightly soft.

1 point: Not soft.

As is clear from Table 1, the side seal portion of the diaper of the example was soft and the skin feel was good. On the other hand, in Comparative Examples 1 and 2, since the side seal portions are formed by heating and compression, the thickness T of the side seal portions (fused portions) is smaller than the side seal portions of the front side portion and the back side portion. The thicknesses Ta and Tb of the outer casing are partially inferior, and as a result, the side seal portion is inferior in touch as compared with the embodiment.

[Embodiment 2]

In the first embodiment, a pants-type disposable diaper was produced in the same manner as in Example 1 except that the scanning speed of the laser was 280 m/s.

[Example 3]

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

[assessment]

With respect to each of the diapers of the examples, the production rate of the transverse cracks of the side seal portions was evaluated by the following method. The results are shown in Table 2 below. Further, with respect to the diapers of Comparative Examples 1 and 2 described above, the rate of occurrence of the transverse crack of the side seal portion was also evaluated by the same method. The results are shown together in Table 2 below.

[The rate of generation of transverse cracks in the side seals]

The ventral region and the dorsal region of the waist region of the diaper are grasped, and when they are torn from the waist to the leg, they cannot be torn once as a "transverse crack", and the total number is calculated. For each of the diapers of the examples and the comparative examples, the measurement was performed 40 times, and the rate of occurrence of the "transverse crack" was expressed as a percentage.

As is clear from Table 2, the rate of occurrence of the transverse crack of the side seal portion of the diaper of the example was as small as 5% or less. On the other hand, in Comparative Examples 1 and 2, the generation rate of the transverse cracks was 50% and 20%, and the ratio of the transverse cracks was relatively large. Judging from these results, according to the diaper of the embodiment, the lateral crack of the side seal portion can be effectively prevented.

[Industrial availability]

According to the first aspect of the invention, in the wearing state of the diaper, the side seal portion is deformed so as to extend in a meandering manner, so that the side seal portion becomes easy to follow the body of the wearer, and is not easily applied to the muscle of the wearer. Skin irritation.

According to the second aspect of the invention, there is provided a pants-type wearing article which, although including a side seal portion, has an outer appearance such as a panty, and the side seal portion is soft and the skin feel is excellent.

According to the third aspect of the invention, there is provided a pants-type wearing article which is less likely to cause lateral cracking of the side seal portion, and can be easily and smoothly removed after use.

6A‧‧‧ Ventral sheet member

6B‧‧‧ Back side sheet member

80a‧‧‧Flexible components

80b‧‧‧Flexible components

F‧‧‧Stretching force

S‧‧‧Side seal

W‧‧‧Width

X‧‧‧ portrait

Y‧‧‧ horizontal

Claims (29)

A pant type disposable diaper comprising a crotch portion, a ventral side portion and a back side portion extending from the lower portion of the crotch portion, and side edges of the ventral side portion and side edges of the back side portion respectively One of the pair of side seal portions and having a longitudinal direction corresponding to the front and rear direction of the wearer and a transverse direction orthogonal thereto, and the side seal portion is in a state of wearing the diaper before the wearing of the diaper It extends straight along the longitudinal direction of the diaper and, in the worn state, extends in the longitudinal direction of the diaper. The pant-type disposable diaper according to claim 1, wherein the thickness of the side seal portion is larger than a thickness of a portion of each of the front side portion and the back side portion of the back side portion adjacent to the side seal portion. A pant-type disposable diaper according to claim 1, further comprising an outer surface of the diaper outer surface, wherein the side seal portion has a sealing edge portion extending along a length direction of the side seal portion The continuous linear fusion portion is formed by combining an edge portion of the outer casing in the front side portion with an edge portion of the outer casing in the back side portion, and the fusion portion extends in the side seal portion In the cross section orthogonal to the direction of the wearer, the length from the side closer to the wearer's skin toward the side farther from the wearer's skin is defined as the width W, and the center position of the width W is orthogonal to the direction When the length is the thickness T, the thickness T of the fusion portion is the same as or smaller than the total thickness of the outer casing on the front side portion side and the outer surface side on the back side portion side. The thickness T of the fusion portion is larger than the thickness of at least one of the outer casing on the side of the front side and the outer casing on the side of the back side. The pants-type disposable diaper of claim 3, wherein the thickness T of the fusion portion is large The thickness of any one of the outer casing on the side of the front side and the outer casing on the side of the back side. The pants-type disposable diaper according to claim 3, wherein the width W of the fusion portion is smaller than the thickness T of the fusion portion. The pant-type disposable diaper according to claim 3, wherein at least one of the outer casing on the front side portion side and the outer casing on the back side portion side is formed at a portion adjacent to the side seal portion The concave-convex region in which the transverse cross-sectional shape is continuously deformed by the contraction of the elastic member disposed in the outer casing, and the width W of the welded portion is smaller than the amplitude height of the concave-convex region in the worn state. The pant-type disposable diaper according to claim 3, wherein the sealing edge portion is located outside the fusion portion in the inner and outer directions, and does not have a fiber-shaped portion of the constituent fibers of the outer casing. The pant-type disposable diaper according to claim 3, further comprising a waist opening portion and a pair of leg opening portions, wherein the sealing edge portion is formed over the entire length between the waist opening portion and the leg opening portion. The pants-type disposable diaper according to claim 3, wherein the width W of the fusion portion is less than 0.3 mm, and the thickness T of the fusion portion is 0.3 mm or more. The pant-type disposable diaper according to claim 1, wherein the side seal portion has a joint portion extending in a longitudinal direction of the diaper, and a non-joining portion is not present on a lateral outer side of the diaper from the joint portion. The pants-type disposable diaper according to claim 1, wherein the elastic members extending in the lateral direction of the diaper are spaced apart from each other in the longitudinal direction of the diaper and are disposed in an extended state in both the front side portion and the back side portion In the plurality of elastic members of the at least one of the front side portion and the back side portion, One end portion reaches the side seal portion or its vicinity, and when viewed in the longitudinal direction of the diaper, the elastic member disposed on the front side portion is disposed at an end portion of the side seal portion and disposed at the back side portion The positions of the elastic members on the end portions of the side seal portions do not match. The pants-type disposable diaper according to claim 11, wherein the elastic member disposed on the back side portion is at an end portion of the side seal portion, and is located in the front side portion of the diaper in the longitudinal direction of the diaper. Two of the adjacent elastic members are located substantially at an intermediate position of the end of the side seal portion. The pant-type disposable diaper according to claim 1, wherein the elastic member disposed on the front side portion is at a position of an end portion of the side seal portion and the rear side portion disposed at the back side portion when viewed in a longitudinal direction of the diaper The elastic member has substantially the same position at the end of the side seal portion, and the plurality of elastic members disposed on the front side portion of the elastic member include a ventral high elongation stress elastic member having a relatively high elongation stress and a belly having a relatively low elongation stress a side low elongation stress elastic member, the ventral high elongation stress elastic member and the ventral low elongation stress elastic member are alternately arranged along a longitudinal direction of the diaper, and the plurality of elastic members disposed on the back side portion include a relatively high elongation stress a back side high elongation stress elastic member 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 being alternately arranged along the longitudinal direction of the diaper, along the above When the diaper is longitudinally observed, the position of the ventral high elongation stress elastic member and the position of the back side low elongation stress elastic member The position of the ventral low elongation stress elastic member is substantially the same as the position of the back side high elongation stress elastic member, and the elongation stress of the ventral high elongation stress elastic member is relatively higher than the back side low elongation stress elasticity. Member, and the elongation of the above-mentioned back side high elongation stress elastic member The stress is relatively higher than the above-mentioned ventral low elongation stress elastic member. The pants-type disposable diaper according to claim 13, wherein the ventral high elongation stress elastic member and the back side high elongation stress elastic member have substantially the same elongation stress, and the ventral low elongation stress elastic member has a low elongation with the back side The elongation stress of the stress elastic member is approximately the same. The pant-type disposable diaper according to claim 13, wherein the elongation stress is different by making the thickness of the elastic member different. The pant-type disposable diaper according to claim 13, wherein the elongation stress is different by varying degrees of elongation of the elastic member. A pant-type disposable diaper according to claim 1, further comprising an outer surface of the diaper outer surface, wherein the side seal portion has a sealing edge portion extending along a length direction of the side seal portion The continuous linear fusion portion is formed by combining an edge portion of the outer casing in the front side portion with an edge portion of the outer casing in the back side portion, and the fusion portion extends in the side seal portion When the direction perpendicular to the wearer's skin is toward the side away from the wearer's skin, the direction perpendicular to the wearer's skin is the inner-outer direction P, and when the direction orthogonal to the inner-outer direction P is the thickness direction Q, The distance Dw between the both end portions in the thickness direction Q and the inner end portion of the wearer's skin closest to the inner and outer directions P is the opposite portion of the inner end portion and the outer edge of the fusion portion The distance between the inner and outer directions P is more than Dc. A pants-type disposable diaper according to claim 17, wherein said distance Dw is greater than said distance Dc. The pants-type disposable diaper according to claim 17, wherein the outer edge of the fusion portion has a shape that is recessed toward the inner side in the inner and outer directions in a cross section orthogonal to a direction in which the side seal portion extends. The pant-type disposable diaper of claim 17, wherein the distance Dw is the distance Dw The thickness Tc of the above-mentioned fusion portion at the central position of the halved portion is equal to or greater. The pants-type disposable diaper according to claim 17, wherein the side seal portion is more likely to be broken in the inner and outer directions than the inner side end portion and the inner side end portion. The pants-type disposable diaper according to claim 17, wherein the thickness of the front side portion and the back side portion in the inner and outer directions is smaller than a thickness of a portion outside the inner end portion and smaller than the inner side portion The thickness. A pant type disposable diaper comprising an outer surface forming an outer surface of the wearing article, and joining the two side edges of the outer body in the front body piece and the two side edges of the outer body in the back body piece a pants-type wearing article having a pair of side sealing portions, a waist opening portion, and a pair of leg opening portions, wherein the side sealing portion has a sealing edge portion that is continuous by extending along a length direction of the side sealing portion The linear fusion portion is formed by combining an edge portion of the outer body of the front body piece with an edge portion of the outer body of the back body piece, and the fusion portion is formed on a cross section orthogonal to a direction in which the side seal portion extends. The length of the inner and outer directions from the side of the wearing article close to the wearer's skin toward the side far from the wearer's skin is defined as the width W, and the length of the center position of the width W orthogonal to the direction is defined as the thickness T. The thickness T of the fusion-molded portion is the same as or smaller than the total thickness of the front body-side outer casing and the rear body-side outer casing, and the thickness T of the fusion portion is larger than the front body side outer casing and At least one of the back body side outer casings Degree. The pants-type disposable diaper according to claim 23, wherein the thickness T of the fusion portion is greater than a thickness of any one of the front body side outer body and the back body side outer body. The pants-type disposable diaper according to claim 23, wherein the width W of the fusion portion is smaller than the thickness T of the fusion portion. The pant-type disposable diaper of claim 23, wherein the front body side outer body and the back body At least one of the sheet-side outer casings is formed with a concave-convex region in which a transversely-shaped cross-sectional shape is continuously deformed by a contraction of the elastic member disposed in the outer casing at a portion adjacent to the side seal portion, and In the wearing state, the width W of the fusion portion is smaller than the amplitude height of the uneven portion. The pant-type disposable diaper according to claim 23, wherein the sealing edge portion is located outside the fusion portion in the inner and outer directions, and the fiber having no fiber shape is left in the constituent fiber of the outer casing. The pant-type disposable diaper according to claim 23, wherein the sealing edge portion is formed over the entire length between the waist opening portion and the leg opening portion. The pants-type disposable diaper according to claim 23, wherein the width W of the fusion portion is less than 0.3 mm, and the thickness T of the fusion portion is 0.3 mm or more.