JP2015112401A - Absorber - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an absorber, when being used for an absorbent article, improving comfort by hardly providing a user with a feeling of discomfort, hardly inhibiting gas permeability, and hardly inhibiting swelling of an absorbent polymer contained in a humor absorbent material.SOLUTION: An absorber 1A is a vertically-long absorber for absorbent articles formed by wrapping an absorbent polymer 3 as an absorbent material by sheet members 21 and 22 containing a thermally fusible synthetic resin. The absorber 1A is formed into a bag shape by forming a fusion part 4 formed by fusing the sheet members 21 and 22 to each other, on at least a part of the whole peripheral edge of the absorber 1A. A value of the thickness T/width W of the fusion part 4, as a ratio of the thickness T to the width W, is equal to or more than 1.

Description

  The present invention relates to an absorbent body used for absorbent articles.

  Generally, an absorbent body used for an absorbent article such as a disposable diaper is formed by covering an absorbent core made of water-absorbing polymer particles with a core wrap sheet. For example, Patent Document 1 discloses an absorbent body in which a body fluid-absorbing material is interposed between two sheets, and the two sheets are heat-sealed by being melted by heating and pressurizing. An absorber is described. Patent Document 2 describes an absorbent body in which a body fluid absorbent material is interposed between two sheets, in which the two sheets are fixed by a hot melt adhesive for sealing. Has been.

JP 2010-063815 A JP 2012-152471 A

  The absorber as described in Patent Document 1 is hard because the heat seal portion formed by melting two sheets is formed so wide. Therefore, if an absorbent article provided with such an absorbent body is worn, the heat seal portion gives the wearer a feeling of strangeness, resulting in an absorbent article that is inferior in wearing feeling. Moreover, since the heat seal part is formed so as to be wide, the swelling of the absorbent polymer contained in the body fluid absorbent material is hindered, resulting in an absorbent article that hardly exhibits its original absorption performance.

  Moreover, since the absorber as described in Patent Document 2 is formed by fixing two sheets with a hot melt adhesive for sealing, the hardness of the fixing portion is improved, but it is formed very wide. Therefore, the breathability is inhibited, and further, the swelling of the absorbent polymer contained in the body fluid absorbent material is inhibited, resulting in an absorbent article having poor comfort.

  Therefore, this invention is providing the absorber which can eliminate the fault which the prior art mentioned above has.

  The present invention is a vertically long absorbent body for an absorbent article in which an absorbent material is wrapped with a sheet member containing a heat-fusible synthetic resin. The absorbent body is formed by fusing the sheet members together. The fusion part is formed in at least a part of the entire peripheral edge of the absorber to form a bag, and the fusion part has a thickness / width value that is a ratio of the thickness to the width. It provides an absorber that is one or more.

  According to the present invention, when used in an absorbent article, it is difficult to give the user a sense of incongruity, it is difficult to inhibit breathability, and furthermore, it is difficult to inhibit swelling of the absorbent polymer contained in the body fluid-absorbing material. Will improve.

FIG. 1 is a plan view schematically showing an absorbent body which is a first embodiment of the absorbent body of the present invention. 2 is a cross-sectional view schematically showing a cross section taken along line II-II shown in FIG. 3 is a cross-sectional view schematically showing a cross section taken along line III-III shown in FIG. FIG. 4 is a perspective view schematically showing a pants-type disposable diaper including the absorbent body of the present invention. FIG. 5 is a plan view schematically showing an unfolded and extended state of the diaper shown in FIG. 6 is a cross-sectional view of a portion corresponding to the cross-sectional view shown in FIG. 2 in a state where the absorbent polymer swells. FIG. 7 is a plan view schematically showing an absorbent body that is the second embodiment of the absorbent body of the present invention. 8 is a cross-sectional view schematically showing a cross section taken along line VIII-VIII shown in FIG. 9 is a cross-sectional view of a portion corresponding to the cross-sectional view shown in FIG. 8 in a state where the absorbent polymer swells. FIG. 10 is a plan view schematically showing an absorbent body that is the third embodiment of the absorbent body of the present invention. 11 is a cross-sectional view schematically showing a cross section taken along line XI-XI shown in FIG. 12 is a cross-sectional view of a portion corresponding to the cross-sectional view shown in FIG. 11 in a state where the absorbent polymer swells. FIG. 13: is a top view which shows typically the absorber which is 4th Embodiment of the absorber of this invention. 14 is a cross-sectional view schematically showing a cross section taken along line XIV-XIV shown in FIG. 15 is a cross-sectional view of a portion corresponding to the cross-sectional view shown in FIG. 14 in a usage state of the diaper. FIG. 16 is a perspective view schematically showing a process of manufacturing the absorber shown in FIG. 1 using a laser bonding apparatus. FIG. 17A to FIG. 17C are explanatory views for explaining a state in which the fused portion of the absorber is formed using the laser type bonding apparatus shown in FIG.

  The present invention will be described below based on preferred embodiments with reference to the drawings. Absorbent body 1A which is the first embodiment of the absorbent body of the present invention is a vertically long absorbent body for absorbent articles in which an absorbent material is wrapped with a sheet member 2 containing a heat-fusible synthetic resin. Specifically, as shown in FIGS. 1 and 2, the absorbent body 1 </ b> A has a longitudinal direction in which an absorbent polymer 3 that is an absorbent material is wrapped with two first sheet members 21 and a second sheet member 22. It is formed in a rectangular shape having a direction X and a width direction Y orthogonal thereto.

  As shown in FIGS. 1 and 2, the absorbent body 1 </ b> A of the first embodiment has a rectangular first sheet member 21 that is long in the longitudinal direction X, and a rectangular shape that is the same shape and size as the first sheet member 21. And a second sheet member 22. In addition, in the absorbent body 1A, the main direction of the constituent fibers of the first sheet member 21 and the second sheet member 22 is seen, and the longitudinal direction X coincides with the MD direction along the fiber orientation direction, The width direction Y coincides with the CD direction orthogonal to the MD direction. In the absorbent body 1 </ b> A, the absorbent material is formed only from the absorbent polymer 3. The length in the longitudinal direction X of the absorbent body 1A is preferably about 10 cm to 100 cm, and the length in the width direction Y is preferably about 2 cm to 50 cm.

  The absorbent body 1A is formed in a bag shape by forming a fused portion 4 formed by fusing the sheet members 2 to at least a part of the entire periphery of the absorbent body 1A. Specifically, in the absorbent body 1A of the first embodiment, as shown in FIGS. 1 and 2, the two first sheet members 21 and the first sheet member 21 are disposed in a state where the absorbent polymer 3 that is an absorbent material is sandwiched. The two sheet members 22 are overlapped, and the two first sheet members 21 and the second sheet member 22 are fused over the entire circumference to form the fused portion 4. Thus, 1 A of absorbers are formed in the bag shape which wraps the absorptive polymer 3 by forming the melt | fusion part 4 over the whole periphery of 1 A of absorbers.

  The absorbent polymer 3 accommodated in the absorbent body 1A is difficult to move in the absorbent body 1A and maintains the thickness of the absorbent body 1A, and also obstructs the fusion of the first sheet member 21 or the second sheet member 22. From the viewpoint of avoiding this, it is preferable that the first sheet member 21 or the second sheet member 22 is fixed with a hot-melt adhesive.

  In the absorbent body 1A, the first sheet member 21 and the second sheet member 22 are liquid-permeable sheets. The first sheet member 21 and the second sheet member 22 include a heat-sealable synthetic resin and are formed using the resin as a main component. Examples of the resin material include heat-sealable synthetic resins such as polyethylene, polyethylene terephthalate, and polypropylene. Examples of the first sheet member 21 and the second sheet member 22 include a nonwoven fabric, a film, and a laminate sheet of a nonwoven fabric and a film. Examples of the nonwoven fabric include air-through nonwoven fabric, heat roll nonwoven fabric, spunlace nonwoven fabric, spunbond nonwoven fabric, and melt blown nonwoven fabric. In the absorbent body 1A, both the first sheet member 21 and the second sheet member 22 are liquid permeable sheets, but at least one of the first sheet member 21 and the second sheet member 22 is liquid permeable. If it is this sheet member, the remaining other may be a liquid-impermeable sheet member.

As the absorbent polymer 3 accommodated in the absorbent body 1A, various known absorbent polymers used for absorbent articles can be used. Examples of the absorbent polymer 3 include polyacrylic acid soda, (acrylic acid-vinyl alcohol) copolymer, cross-linked polyacrylic acid soda, (starch-acrylic acid) graft polymer, and (isobutylene-maleic anhydride) co-polymer. Examples thereof include a polymer and a saponified product thereof, potassium polyacrylate, and cesium polyacrylate. Capacity of the absorbent polymer 3 is preferably in the absorbent body 1A is a ^10g / ^{m 2 ~400g} / m 2 approximately.

  As shown in FIGS. 1 and 2, the absorbent body 1 </ b> A has an inner fusion part 5 formed by fusing the sheet members 2 on the inner side of the entire circumference, and on the inner side of the inner fusion part 5. A through hole 6 is formed. In the absorbent body 1 </ b> A, the inner fused portion 5 is formed in a vertically long shape in the longitudinal direction X, and the through hole 6 is also formed in a vertically long shape in the longitudinal direction X. In the absorbent body 1 </ b> A, two inner fusion parts 5 are arranged, and a through hole 6 is formed inside each inner fusion part 5. The two inner fusion parts 5 are formed at positions separated from the fusion part 4 arranged over the entire circumference.

  The ratio of the length in the longitudinal direction X of the through hole 6 to the length in the longitudinal direction X of the absorbent body 1A (the length of the through hole 6 / the length of the absorbent body 1A) is preferably 4 or more. More preferably, it is preferably 9 or less, and more preferably 8 or less. Specifically, the length in the longitudinal direction X of the through hole 6 is preferably about 5 cm to 80 cm.

  As shown in FIG. 1, the absorbent body 1 </ b> A has a cell 7 in which at least a part of the periphery is surrounded by the inner fusion part 5 on the inner side of the entire circumference in plan view. Absorbent material is arranged inside. Specifically, in the absorbent body 1A, the cell 7 surrounded by both ends in the longitudinal direction X and the two inner fusion parts 5 and 5 in the fusion part 4 arranged over the entire circumference, and the fusion Both end portions in the longitudinal direction X of the bonding portion 4, one side portion on the left side along the longitudinal direction X in the fusion portion 4, and one inner fusion portion on the left side of the two inner fusion portions 5 and 5. The cell 7 surrounded by the portion 5, both end portions in the longitudinal direction X of the fused portion 4, the other side portion on the right side along the longitudinal direction X in the fused portion 4, and the two inner fused portions 5 , 5 and the cell 7 surrounded by the other inner fusion part 5 on the right side. That is, the absorber 1 </ b> A has three cells 7. An absorbent polymer 3 that is an absorbent material is disposed inside each cell 7. As described above, in the absorbent body 1A, the absorbent polymer 3 is arranged inside the three cells 7, so that the absorbent polymer 3 is difficult to move in the width direction Y, and it is easy to maintain the thinner absorbent body 1A. It has become.

The fused part 4 has a thickness / width value of 1 or more, which is a ratio of thickness to width. In the absorbent body 1A, the inner fused portion 5 is also formed such that the thickness / width value, which is the ratio of the thickness to the width, is 1 or more. More specifically, the fused portion 4 and the inner fused portion 5 are formed by melting and solidifying the constituent resin of the sheet member 2. The fused part 4 and the inner fused part 5 are formed to extend continuously in a linear shape, and the fused part 4 and the inner fused part 5 are substantially free of intermittent parts. Further, the hot melt adhesive is not substantially present in the portion where the fused portion 4 and the inner fused portion 5 are formed. Here, “substantially no hot-melt adhesive” means not only that no hot-melt adhesive is present, but also bonds the first sheet member 21 and the second sheet member 22 together. It not intended arranged intended, is meant to include also a state of being disposed without extremely low basis weight ^{(0.1g / m 2 ~5g / m} 2 about) intended. As described above, since no hot-melt adhesive is present, the air permeability in the vicinity of the fused portion 4 and the inner fused portion 5 is hardly impaired.

  As described above, the fused portion 4 and the inner fused portion 5 are formed by melting and solidifying the constituent resins of the sheet members 21 and 22 in a state where the first sheet member 21 and the second sheet member 22 are overlapped. ing. Therefore, the fusion | melting part 4 and the inner side fusion | fusion part 5 are the resin of the sheet member which comprises this in the bulk state. The bulk state is a state in which the constituent fibers of the non-woven fabric of the sheet members 21 and 22 constituting the fused portion 4 and the inner fused portion 5 are lost as a fiber state by melting and become a block resin. That is.

  In the following description, the fusion part 4 disposed on one end edge 1At (see FIG. 1) in the longitudinal direction Y of the absorbent body 1A among the fusion part 4 and the inner fusion part 5 will be described as an example. Note that the fusion part 4 and the inner fusion part 5 arranged on both side edges along the longitudinal direction Y of the absorbent body 1A differ only in the arranged positions, and the fusion parts arranged on the one end edge 1At to be described below. It is formed in the same way as the landing part 4. Specifically, as shown in FIG. 3, in the fusion part 4 constituting the one end edge 1 At, the length in the longitudinal direction X is the width in the direction in which the one end edge 1 At extends, that is, in the cross section orthogonal to the width direction Y. In the figure, the direction perpendicular to the longitudinal direction X, that is, the length in the Z direction, which is the thickness direction of the absorber 1A, is defined as the thickness T. Further, the thickness direction of the fused portion 4 and the inner fused portion 5 is the same as the thickness direction of the sheets constituting the fused portion 4 and the inner fused portion 5.

  The fusion part 4 (inner fusion part 5) has a thickness T / width W value of 1 or more, which is a ratio of the thickness T to the width W, and is 1.2 or more from the viewpoint of enhancing the texture of the edge. It is preferably some, more preferably 1.5 or more, and particularly preferably 2 or more. The value of thickness T / width W is preferably 7 or less, more preferably 6 or less, and particularly preferably 5 or less.

  The value of the width W itself of the fusion part 4 (inner fusion part 5) is preferably 0.05 mm or more, particularly 0.1 mm or more, and preferably 1 mm or less, particularly 0.7 mm or less. For example, the width W of the fusion part 4 (inner fusion part 5) is preferably 0.05 mm or more and 1 mm or less, and more preferably 0.1 mm or more and 0.7 mm or less.

  The value of the thickness T itself of the fused part 4 (inner fused part 5) is preferably 0.05 mm or more, particularly 0.1 mm or more, preferably 5 mm or less, particularly 3 mm or less. For example, the thickness T of the fusion part 4 (inner fusion part 5) is preferably 0.05 mm or more and 5 mm or less, and more preferably 0.1 mm or more and 3 mm or less. By setting the thickness T of the fusion part 4 (inner fusion part 5) to such a value, while maintaining the bonding strength of the fusion part 4 (inner fusion part 5) at a sufficiently high value, The texture of the fusion part 4 (inner fusion part 5) can be made favorable.

  The fusion part 4 (inner fusion part 5) has a thickness T that is the sum of the thicknesses of the first sheet member 21 and the second sheet member 22 constituting the fusion part 4 (inner fusion part 5). That is, it is smaller than the total thickness of each of the first sheet member 21 and the second sheet member 22. That is, when the thickness of the first sheet member 21 is Ta and the thickness of the second sheet member 22 is Tb, the relationship of T <Ta + Tb is established. Since the thickness T of the fusion part 4 (inner fusion part 5) and the thickness of the sheet member constituting the fusion part 4 (inner fusion part 5) have such a relationship, It is effectively prevented that the edge 1At becomes hard due to the above, and the texture of the end region including the edge 1At is improved.

  From the viewpoint of making the above advantageous effects more prominent, when the total thickness of the sheet members 21 and 22 constituting the fusion part 4 (inner fusion part 5) is Tt (Tt = Ta + Tb), The value of W / Tt, which is the ratio of the width W of the fused portion 4 (inner fused portion 5) to the total thickness Tt, is preferably 0.5 or less, particularly 0.4 or less. The value of W / Tt is preferably 0.005 or more, particularly 0.01 or more. For example, the value of W / Tt is preferably 0.005 or more and 0.5 or less, and more preferably 0.01 or more and 0.4 or less.

  From the same viewpoint, the thickness T of the fusion part 4 (inner fusion part 5) is larger than the thickness of each sheet member 21, 22 itself constituting the fusion part 4 (inner fusion part 5). Is preferred. For example, the thickness T of the fusion part 4 (inner fusion part 5) is preferably larger than the thickness Ta of the first sheet member 21. In addition, the thickness T of the fusion part 4 (inner fusion part 5) is preferably larger than the thickness Tb of the second sheet member 22. The thickness T of the fusion part 4 (inner fusion part 5) is particularly preferably larger than any of the individual sheet members 21, 22 constituting the fusion part 4 (inner fusion part 5). However, the present invention is not limited to this, and it may be larger than the thickness of any one of the individual sheet members 21 and 22 constituting the fusion part 4 (inner fusion part 5).

  In the present invention, the thickness T of the fused portion 4 (inner fused portion 5) is cut out from the one end edge 1At side in the longitudinal direction X of the absorbent body 1A as shown in FIG. Measured by observing with KEYENCE VHX-1000). The cutting is performed using, for example, a razor. Prior to cutting out, the fused portion 4 is cooled by cold spray. The magnification is 50 to 200 times. Then, the thickness T is measured from the observation image. The above-described width W is also measured by the same method.

On the other hand, the thicknesses Ta and Tb of the sheet members 21 and 22 constituting the fusion part 4 (inner fusion part 5) are measured as follows. The measurement position is a position that is 1 mm to 11 mm away from the fusion part 4 of the one end edge 1At inward in the longitudinal direction X. At this position, a sample is cut out from each of the first sheet member 21 and the second sheet member 22. This sample is sandwiched between flat plates and a load of 0.5 cN / cm ² is applied. The distance between the flat plates in this state is measured, and the value is taken as the thickness. The sample is cut into a 10 mm × 10 mm square. If the dimensions cannot be cut out, cut them out as close as possible.

  The thickness T of the fusion part 4 (inner fusion part 5) and the thicknesses of the sheet members 21 and 22 constituting the fusion part 4 (inner fusion part 5) are measured along the edge 1At. The measurement is performed on three cross-sections with different directions, and the average value of the measured values is taken as each value. The measurement is preferably performed up to a unit of 0.01 mm.

  As shown in FIG. 3, when the fusion part 4 is viewed in a longitudinal section along the thickness direction Z, the outer edge 4a of the fusion part 4 has an arc shape that protrudes inward along the longitudinal direction X of the absorber 1A. I am doing. The fused portion 4 has the largest thickness in the central area along the thickness direction Z of the absorbent body 1A, and the thickness gradually decreases from the central area toward the side. The fused part 4 having such a shape has a so-called crescent or half-moon shape (the fused part 4 shown in FIG. 3 has a crescent shape). When the fusion part 4 is formed in such a crescent shape or a half-moon shape, the amount of resin present at both ends in the thickness direction Z of the fusion part 4 is smaller than that in the central region. Thus, the flexibility and feel of the sheet members 21 and 22 constituting the sheet 4 are difficult to be impaired. In addition, since a sufficient amount of resin is present in the central region in the thickness direction Z of the fusion part 4, the fusion part 4 has a practically sufficient strength and the fusion part 4 is torn. Inconvenience is unlikely to occur.

Moreover, the space | interval of the fusion | melting part 4 and the absorptive polymer 3 which is an absorptive material is a viewpoint of the cost reduction by reducing fitting length at the time of mounting | wearing, reducing an absorber length and width, and prevention of the absorptive polymer 3 exposure. To 10 mm or less, and particularly preferably 7 mm or less. The interval is preferably 2 mm or more, particularly 4 mm or more. For example, the interval is preferably 2 mm or more and 10 mm or less, and more preferably 4 mm or more and 7 mm or less. In addition, the space | interval of the fusion | melting part 4 and the absorptive polymer 3 is a space | interval of the absorptive polymer 3 and the fusion | melting part 4 of the nearest position.
In addition, the distance between the inner fused portion 5 and the absorbent polymer 3 as the absorbent material is 10 mm or less from the viewpoints of improving fit at the time of wearing, preventing swelling of the absorbent polymer, and preventing the absorbent polymer 3 from being exposed. In particular, it is preferably 7 mm or less. The interval is preferably 2 mm or more, particularly 4 mm or more. For example, the interval is preferably 2 mm or more and 10 mm or less, and more preferably 4 mm or more and 7 mm or less. In addition, the space | interval of the inner side fused part 5 and the absorptive polymer 3 is a space | interval of the absorbent polymer 3 and the inner side fused part 5 of the nearest position.

  The fusion part 4 (inner fusion part 5) configured as described above can be formed by irradiating laser light, as will be described later. A method of forming the fusion part 4 (inner fusion part 5) will be described later.

Next, one use form and effect at the time of using the absorber 1A of 1st Embodiment of this invention mentioned above for an absorbent article (pants-type disposable diaper 101) are demonstrated.
The absorbent article shown in FIGS. 4 and 5 is a pants-type disposable diaper 101 including an absorbent main body 102 having an absorbent body 1A and an exterior body 103 disposed on the non-skin facing surface side of the absorbent main body 102. . The pants-type disposable diaper 101 includes an absorbent main body 102 having the absorbent body 1 </ b> A and an exterior body 103 that forms the outer surface of the wearing article, and both left and right edges along the longitudinal direction X of the exterior body 103 in the abdominal side A The left and right side edges B1 and B1 along the longitudinal direction X of the exterior body 103 in the back part B are joined to the parts A1 and A1, and the pair of side seal parts 104 and 104, the waist opening 108 and the pair of leg openings 109, 109 are formed. The exterior body 103 is positioned on the non-skin contact surface side of the absorbent main body 102 and fixes the absorbent main body 102.

  The diaper 101 has a longitudinal direction corresponding to the wearer's front-rear direction and a width direction orthogonal to the wearer's front-rear direction in a developed and extended plan view as shown in FIG. The longitudinal direction coincides with the longitudinal direction X of the absorbent body 1A, and the width direction coincides with the width direction Y of the absorbent body 1A. The diaper 101 can be divided into a crotch part C disposed in the crotch part at the time of wearing, and an abdominal side part A and a back side part B located in the longitudinal direction X. The abdominal side A is located on the wearer's abdomen when the diaper 101 is worn, and is disposed on one side in the longitudinal direction X of the diaper 101. The back side portion B is located on the back side of the wearer when the diaper 101 is worn, and is disposed on the other side in the longitudinal direction X. The exterior body 103 in the crotch C is formed with recesses for forming leg openings 109 and 109 at both left and right edges along the longitudinal direction X thereof.

  In the present specification, the skin contact surface is a surface of the diaper 101 or a constituent member thereof (for example, an absorbent main body) that is directed toward the wearer's skin when worn, and the non-skin contact surface is the diaper 101 or the same. It is a surface which is directed to the opposite side (clothing side) of the skin side of the wearer during wearing. In the diaper 101, the longitudinal direction X coincides with the direction (longitudinal direction) along the long side of the absorbent main body 102 which is the diaper 101 or its constituent member, and the width direction Y is the absorbent which is the diaper 101 or its constituent member. This coincides with the width direction of the main body 102.

  As shown in FIG. 5, the absorbent main body 102 has a vertically long shape in which one direction (longitudinal direction X) is relatively long, and a top sheet 121 that forms a skin contact surface, and a non-skin contact A back sheet 122 that forms a surface, and a liquid-retaining absorbent 1 </ b> A that is interposed between these sheets 121 and 122 are provided. The absorbent main body 102 has three-dimensional gather forming sheets 124 and 124 each having a stretched elastic member 123 at a free end on both sides along the longitudinal direction X. The absorbent main body 102 is joined to a central portion of the outer package 103 by a known joining means (adhesive or the like) so that the longitudinal direction thereof coincides with the longitudinal direction X of the diaper 101 in the expanded and extended state. Here, the expanded and extended state means that the side seal portion 104 is peeled off to make the diaper into an expanded state, and the expanded diaper is extended by the elastic member of each part, so that the design dimensions (the influence of the elastic member is not affected at all). It means a state where it is expanded until it becomes the same size as when it is expanded in a flat state in the excluded state.

  As shown in FIGS. 4 and 5, the outer package 103 is arranged on the outer layer sheet 131 that forms the outer surface of the diaper 101 (the non-skin contact surface of the outer package 103), and on the inner surface side of the outer layer sheet 131. 101 and an inner layer sheet 132 that forms the inner surface of 101 (the skin contact surface of the exterior body 103). Between the two sheets 131 and 132, a plurality of thread-like or belt-like waist elastic members 105 fixed by an adhesive are disposed in an expanded state. The waist elastic member 105 extends in the width direction Y. The waist elastic member 105 is disposed in both end regions in the longitudinal direction X in the ventral side A and the back side B. As a result, both end regions of the abdominal part A and the back part B can be expanded and contracted along the width direction Y, and a waist gather is formed.

  Between the outer layer sheet 131 and the inner layer sheet 132, a plurality of thread-like or belt-like leg elastic members 107 fixed by an adhesive are arranged in an extended state. The leg elastic member 107 extends along the shape of the recessed portion on both side edges in the width direction Y in the central region in the longitudinal direction X of the exterior body 103. Further, between the waist 131 elastic member 105 and the leg elastic member 107, a plurality of thread-like or belt-like waist elastic members (not shown) fixed by an adhesive are provided between the sheets 131 and 132. It is arranged in the extended state. The waistline elastic member (not shown) extends in the width direction Y. By arranging the leg elastic member 107 and the waist elastic member (not shown), a leg gather and a waist gather are formed in the diaper 101.

  The exterior body 103 does not have a cover member that covers both ends in the longitudinal direction X of the absorbent main body 102. Specifically, as shown in FIG. 5, the diaper 101 has a skin facing surface side, that is, a side where the absorbent main body 102 is disposed, and both end portions of the absorbent main body 102 before and after the longitudinal direction X are arranged. For example, the outer layer sheet 131 extending from both ends in the longitudinal direction X of the inner layer sheet 132 is not covered with a folded portion or another sheet other than the inner layer sheet 132 and the outer layer sheet 131, so-called a cover. The member is not arranged. In the diaper 101, both ends of the outer layer sheet 131 in the longitudinal direction X and the both ends of the inner layer sheet 132 in the longitudinal direction X coincide with each other, and the outer layer sheet 131 has the same shape and size as the inner layer sheet 132. Is formed.

  The top sheet 121, the back sheet 122, the outer layer sheet 131, the inner layer sheet 132, and the elastic member, which are constituent members of the pants-type disposable diaper 101, are particularly limited to those used in conventional absorbent articles such as disposable diapers. Can be used.

  When the absorbent body 1A of the first embodiment of the present invention described above is used in a pants-type disposable diaper 101 as shown in FIGS. 4 and 5, the absorbent body 1A is first as shown in FIGS. Regarding the fused part 4 that joins the sheet member 21 and the second sheet member 22, the value of thickness T / width W, which is the ratio of the thickness T to the width W of the fused part 4, is 1 or more. Thus, since the width W of the fused part 4 is thin, the contact area of the welded part 4 with the skin via the top sheet 121 is reduced. Furthermore, since the thickness T is large, the density of the fused part 4 can be kept small. And since the hardness of the part which contacts skin is suppressed small, when wearing the underpants type disposable diaper 101, it is hard to give a user a sense of incongruity and it is hard to inhibit air permeability. Moreover, since the thickness T of the fusion | melting part 4 is thick, the space | interval between the 1st sheet | seat member 21 and the 2nd sheet | seat member 22 which wraps the absorptive polymer 3 also becomes comparatively large. Therefore, as shown in FIG. 6, the first sheet member 21 and the second sheet member that wrap the absorbent polymer 3 when the absorbent polymer 3 in the absorbent body 1 </ b> A disposed in the pants-type disposable diaper 101 absorbs body fluid. 22 can have an allowance for swelling, the area other than the fused portion 4 can be used effectively, and the swelling of the absorbent polymer is difficult to inhibit. Further, when the absorbent body 1A is pasted on the back sheet 122, the absorbent body 1A is swollen when the absorbent polymer 3 is swollen by pasting a position other than the vicinity of the fused section 4, for example, at a distance of 10 mm or more from the fused section 4. Can swell in the thickness direction Z. As described above, when the absorbent body 1A is used for the diaper 101, the comfort of the diaper 101 is improved because it is difficult for the user to feel uncomfortable, the air permeability is difficult to inhibit, and the swelling of the absorbent polymer is difficult to inhibit. . Further, in the absorbent body 1A, the first sheet member 21 and the second sheet 22 have the orientation direction of the constituent fibers in the first sheet member 21 and the second sheet member 22, and the CD direction coincides with the width direction Y. The member 22 is easy to spread in the width direction Y, and as shown in FIG. 6, it is difficult to inhibit the swelling of the absorbent polymer. Further, in the absorbent body 1A, the hot melt adhesive is substantially not present in the portion where the fused portion 4 is formed. Therefore, the air permeability is hardly hindered, and the comfort of the diaper 101 is improved.

  Moreover, 1 A of absorbers of 1st Embodiment have the inner side melt | fusion part 5 inside the perimeter of the absorber 1A, as shown in FIG. 1, FIG. A through hole 6 is provided. Therefore, when 1 A of absorbers are used for the diaper 101, air permeability will improve and the comfort of the diaper 101 will improve. Similarly to the fusion part 4, the inner fusion part 5 has a thickness T / width W ratio of 1 or more, which is a ratio of the thickness T to the width W of the inner fusion part 5. Thus, since the thickness T of the inner side fusion | fusion part 5 is thick, the space | interval between the 1st sheet member 21 and the 2nd sheet member 22 which wraps the absorptive polymer 3 also becomes comparatively large. Further, since the through-hole 6 is provided inside the inner fused portion 5, the absorbent polymer 3 can move freely when the absorbent polymer 3 swells, and the interval between the through-holes 6 due to the swelling of the absorbent polymer 3 is as shown in FIG. When used in 101, the first sheet member 21 and the second sheet member 22 that wrap the absorbent polymer 3 can have a room for swelling, and the area other than the fused part 4 and the inner fused part 5 can be effectively used. It can be used and hardly inhibits swelling of the absorbent polymer. When the absorbent polymer swells as described above, the width of the through hole 6 inside the inner fused portion 5 becomes wider after use than before use, as shown in FIG. Therefore, when 1 A of absorbers are used for the diaper 101, air permeability will improve and the comfort of the diaper 101 will improve.

  In the absorbent body 1A of the first embodiment, as shown in FIGS. 1 and 2, since the absorbent material is formed only from the absorbent polymer 3, the absorbent body 1A can be formed thin. Therefore, when 1 A of absorbers are used for the diaper 101, it is hard to give a user a discomfort and the comfort of the diaper 101 improves. Moreover, since the absorptive polymer 3 is fixed to the first sheet member 21 or the second sheet member 22 with a hot-melt adhesive, it is difficult for the absorbent polymer 3 to move in the absorber 1A, and the absorber 1A is kept thin. Can do. In addition, it is difficult to interfere with fusion.

  Further, the absorbent body 1A according to the first embodiment is a cover that covers both ends of the absorbent body 102 in the longitudinal direction X on the exterior body 103 from the viewpoint that the width W of the fused portion 4 is thin and it is difficult for the user to feel uncomfortable. There is no need to arrange the members. Therefore, it becomes possible to manufacture the diaper 101 while suppressing the members, and the cost can be reduced. Moreover, there is no need to arrange a cover member, air permeability is improved, and comfort of the diaper 101 is improved.

  Next, the absorbers 1B to 1D of the second to fourth embodiments of the present invention will be described. The absorbers 1B to 1D of the second to fourth embodiments will be described mainly with respect to points different from the absorber 1A of the first embodiment, and the same points will be denoted by the same reference numerals and description thereof will be omitted. For the points not particularly mentioned, the description relating to the absorbent body 1A of the first embodiment is applied as appropriate. Moreover, about the effect of absorber 1B-1D of 2nd-4th embodiment, a different point from the effect of absorber 1A of 1st Embodiment is demonstrated, The point which is not demonstrated in particular is the same as the effect of absorber 1A. The description of the effect of the absorbent body 1A is applied as appropriate.

  As shown in FIGS. 7 and 8, the absorbent body 1 </ b> B of the second embodiment has a rectangular first sheet member 21 that is long in the longitudinal direction X, and a rectangular shape that is the same shape and size as the first sheet member 21. And a second sheet member 22. In the absorbent body 1 </ b> B, the two first sheet members 21 and the second sheet member 22 are overlapped with the absorbent polymer 3 sandwiched therebetween, and the two first sheet members 21 and the second sheet member 22 are arranged around the entire circumference. The fused portion 4 is formed by fusing over the entire area.

  As shown in FIG. 7, the absorbent body 1 </ b> B of the second embodiment has an inner fusion part 5 formed by fusing the sheet members 2 on the inner side of the entire circumference, and the inner fusion part 5. A through hole 6 is formed inside. In the absorbent body 1 </ b> B, the inner fusion part 5 has a vertically long fusion part 51 formed in a long vertical direction in the longitudinal direction X and a horizontal long fusion part 52 formed in a long horizontal direction in the width direction Y. . Further, the through-hole 6 also has a vertically long through hole 61 that is long and long in the longitudinal direction X, and a horizontally long through hole 62 that is long and long in the width direction Y. In the absorbent body 1 </ b> B, twelve inner fusion parts 5 are arranged, and through holes 6 are formed inside each inner fusion part 5. Specifically, six vertically long fused portions 51 of the inner fused portion 5 are arranged, and six horizontally long through holes 62 of the inner fused portion 5 are arranged. In addition, a vertically long through hole 61 is arranged inside each of the six vertically long fused portions 51, and a horizontally long through hole 62 is arranged inside each of the six horizontally long fused portions 52. The twelve inner fusion parts 5 are formed at positions separated from each other, and are also formed at positions separated from the fusion parts 4 arranged over the entire circumference.

  As shown in FIG. 7, the absorbent body 1 </ b> B has, as viewed in plan, a fusion part 4 that is arranged on the inner side of the entire circumference, the longitudinally fused part 51 of the inner side fusion part 5, or Nine cells 7 surrounded by the laterally long through holes 62 of the inner fusion part 5 are formed. An absorbent polymer 3 that is an absorbent material is disposed inside each cell 7.

  When the absorbent body 1B of the second embodiment of the present invention described above is used for the pants-type disposable diaper 101, the absorbent polymer 3 further moves because the number of cells 7 is larger than that of the absorbent body 1A of the first embodiment. It is difficult to maintain the thickness of the absorbent body 1B, and it is easy to fit the body, so that the feeling of use of the diaper 101 is improved. Further, as shown in FIG. 9, the first sheet member 21 and the second sheet member that wrap the absorbent polymer 3 because the thickness T of the inner fusion part 5 (the vertically long fusion part 51 and the laterally long fusion part 52) is thick. The interval between 22 is also relatively large. Further, since the penetrating item 6 is present inside the inner fused part 5, the absorbent polymer 3 can move freely when the absorbent polymer 3 swells, and the interval of the penetrating term 6 is widened as shown in FIG. As a result, when it is used for the diaper 101, the first sheet member 21 and the second sheet member 22 that wrap the absorbent polymer 3 can be allowed to swell, and the fused portion 4 and the inner fused portion 5 (vertically long) A region other than the fused part 51 and the horizontally long fused part 52) can be used effectively, and it is difficult to inhibit the swelling of the absorbent polymer. When the absorbent polymer swells as described above, the width of the through-hole 6 inside the inner fused portion 5 becomes wider after use than before use, as shown in FIG. Therefore, when the absorber 1B is used for the diaper 101, the air permeability is improved and the comfort of the diaper 101 is improved.

  Next, as shown in FIGS. 10 and 11, the absorbent body 1 </ b> C of the third embodiment has a rectangular first sheet member 21 that is long in the longitudinal direction X, and the same shape and size as the first sheet member 21. And a rectangular second sheet member 22. In the absorbent body 1 </ b> B, the two first sheet members 21 and the second sheet member 22 are overlapped with the absorbent polymer 3 sandwiched therebetween, and the two first sheet members 21 and the second sheet member 22 are arranged around the entire circumference. The fused portion 4 is formed by fusing over the entire area.

  As shown in FIG. 10, the absorbent body 1 </ b> C of the third embodiment does not have the inner fusion part 5 formed by fusing the sheet members 2 inside the entire circumference. Thus, as for the absorber 1C of 3rd Embodiment, the 1st sheet | seat member 21 and the 2nd sheet | seat member 22 are fuse | melted only by the melt | fusion part 4 distribute | arranged over the perimeter.

  When the absorbent body 1C of the third embodiment of the present invention described above is used for the pants-type disposable diaper 101, the cells 7 are not arranged as compared with the absorbent body 1A of the first embodiment, as shown in FIG. Since the amount of change in the thickness direction Z (the paper surface direction in FIG. 10, the vertical direction in FIG. 11 and the vertical direction in FIG. 12) of the absorbent body 1C can be increased, the first sheet member 21 and the second sheet member 21 that wrap the absorbent polymer 3 are used. The sheet member 22 can have an allowance for swelling, the region other than the fused portion 4 can be used effectively, and the swelling of the absorbent polymer is difficult to inhibit. Therefore, when 1 C of absorbers are used for the diaper 101, an absorptivity will improve and the comfort of the diaper 101 will improve.

  Next, as shown in FIGS. 13 and 14, the absorbent body 1 </ b> D of the fourth embodiment is formed by fusing the edges of the sheet member 23 obtained by folding back one sheet member 23. Specifically, one sheet member 23 is folded back so as to wrap the absorbent polymer 3, and then the stacked sheet members 23 are fused along both end portions in the longitudinal direction X to form a fused portion. 4 is formed. Thus, absorber 1D of 4th Embodiment is formed in the bag shape by providing the fusion | melting part 4 only in the both ends of the longitudinal direction X in the all periphery.

  As shown in FIG. 13, the absorbent body 1 </ b> D of the fourth embodiment does not have the inner fusion part 5 formed by fusing the sheet members 2 inside the entire circumference. Thus, as for the absorber 1D of 4th Embodiment, the 1st sheet member 21 and the 2nd sheet member 22 are fuse | melted only by the melt | fusion part 4 distribute | arranged to a part of the perimeter.

  When the absorbent body 1D according to the fourth embodiment of the present invention described above is used for the pants-type disposable diaper 101, the fusion part 4 is arranged only at a part of the entire circumference, and the absorbent body X direction is not fused. The degree of freedom at both ends is high, and since the thickness T is large, the distance between the first sheet members 23 wrapping the absorbent polymer 3 in the vicinity of the fused portion 4 is also relatively large. When used in the diaper 101, there can be room for swelling between the first sheet members 23 that wrap the absorbent polymer 3, and the area other than the fused portion 4 can be used effectively, inhibiting the swelling of the absorbent polymer 3. It is hard to do. Moreover, since the thickness T of the fused portion 4 is thin, it is difficult for the user to feel uncomfortable when wearing the pants-type disposable diaper 101, and the comfort of the diaper 101 is improved.

  1 A of absorbers of 1st Embodiment mentioned above can be manufactured, for example with the manufacturing method demonstrated below. The manufacturing method of the absorber 1 </ b> A includes a laser light irradiation process in which a laser beam is irradiated to form the fused portion 4 and the inner fused portion 5.

  More specifically, first, a belt-shaped first sheet member 21 continuously supplied from an original fabric roll (not shown), and a belt-shaped first sheet member 21 supplied continuously from an original fabric roll (not shown). Between the 1 sheet member 22, the strip | belt-shaped composite body 10 which has arrange | positioned the absorptive polymer 3 which is an absorptive material is formed. The absorbent polymer 3 is distributed by applying a hot melt adhesive in advance to the first sheet member 21 or the first sheet member 22 and then spraying the absorbent polymer 3. The application of the hot melt adhesive and the spraying of the absorbent polymer can be performed in several times. The hot-melt adhesive is applied to a portion other than the portion where the weld portion 4 and the internal weld portion 5 are to be formed. The absorbent polymer 3 that could not be bonded to the sheet member 21 or the sheet member 22 by the hot melt adhesive may be removed by subsequent blowing.

  Next, as shown in FIG. 16, the formed belt-like composite 10 is irradiated with laser light using a laser bonding apparatus 200 to form the fusion part 4 and the inner fusion part 5. As shown in FIG. 16, the laser-type bonding apparatus 200 is arranged in a hollow cylindrical roll 223 that is rotationally driven in the direction of arrow A, and a hollow portion of the cylindrical roll 223, and laser light is directed toward the peripheral surface portion of the cylindrical roll 223. 230, an irradiation head 235 for irradiating 230, and a belt type pressure device 226 provided with an endless pressure belt 224 (pressing member).

  The cylindrical roll 223 is formed by sandwiching and fixing a cylindrical peripheral surface portion between a pair of annular frames 222 and 222 that form both ends in the rotation axis direction. The frame 222 is made of a metal material such as iron, aluminum, stainless steel, or copper, or a material having heat resistance such as ceramics. The entire peripheral surface is made of a laser light transmitting material, and the entire peripheral surface is a laser light transmitting portion.

  The laser-type bonding apparatus 200 has an interval adjusting mechanism (not shown) that can increase or decrease the interval between the peripheral surface portion of the cylindrical roll 223 and the pressure belt 224, and the peripheral surface portion of the cylindrical roll 223 can be adjusted by adjusting the interval. The pressure applied to the belt-shaped composite 10 can be adjusted as appropriate by the pressure belt 224.

  As shown in FIG. 16, the belt-type pressure device 226 includes an endless pressure belt 224 (pressing member) and three rolls 225a, 225b, 225c that rotate in a state where the pressure belt 224 is stretched. It has. The rolls 225a, 225b, and 225c may be drive rolls or driven rolls that rotate with the cylindrical roll 223. The pressure belt 224 moves at the same speed as the peripheral surface portion of the cylindrical roll 223 by rotating any one or more of the rolls 225 a, 225 b, and 225 c or with the cylindrical roll 223. The peripheral surface portion of the cylindrical roll 223 and the pressure belt 224 are preferably maintained in a predetermined temperature range by air cooling, water cooling, or the like.

  As the pressure belt 224 (pressing member), a heat-resistant metal or resin belt that can withstand the heat generated during processing can be used. For example, the pressure belt 224 is made of a metal material such as iron, aluminum, or stainless steel. Can be used. In addition, as the pressure belt 224, a belt that does not transmit the irradiated laser beam is usually used. In addition, what has permeability | transmittance can also be used.

  As shown in FIG. 16, an irradiation head 235 that irradiates laser light 230 toward the peripheral surface portion of the cylindrical roll 223 is provided in the hollow portion of the hollow cylindrical roll 223. The irradiation head 235 is a galvano scanner (an apparatus having a motor shaft with a mirror) that freely scans the laser beam 230, and a mechanism for moving the laser beam 230 back and forth in a direction parallel to the rotation axis of the cylindrical roll 223, the laser beam 230. Includes a mechanism for moving the position (irradiation point) at which the laser beam hits the composite 10 on the circumferential surface in the circumferential direction of the cylindrical roll 223, a mechanism for making the spot diameter of the laser beam 230 constant on the circumferential surface of the cylindrical roll 223, and the like. Yes. By having such a configuration, the laser irradiation mechanism can arbitrarily move the irradiation point of the laser beam 230 in both the circumferential direction and the direction orthogonal to the circumferential direction with respect to the peripheral surface portion of the cylindrical roll 223. Can do.

  As shown in FIG. 16, the band-shaped composite 10 is introduced onto the outer surface of the peripheral surface portion of the cylindrical roll 223 that is rotationally driven in the direction of arrow A with a predetermined tension applied by a guide roll (not shown). Then, after being transported by a predetermined distance in the circumferential direction by the rotation of the cylindrical roll 223 so as to be wound around the peripheral surface portion, the cylindrical roll 223 is separated from the peripheral surface portion by an unillustrated lead roll, nip roll, and the like. In this way, the belt-shaped composite body 10 is wound around the peripheral surface portion of the cylindrical roll 223 with a predetermined tension and conveyed so as to be in pressure contact with the pressure belt 224, whereby the peripheral surface portion of the cylindrical roll 223 in the composite body 10 is conveyed. And the portion sandwiched between the pressure belt 224 and the vicinity thereof are in a state of being pressurized (compressed) in the thickness direction from before being divided by the laser light irradiation. For this reason, the composite 10 can be compressed more efficiently, and as a result, the composite 10 under compression is irradiated with a laser beam to form the fused portion 4 and the inner fused portion 5. In doing so, it is possible to reliably form the through hole 6 inside the inner fused portion 5.

  Specifically, in the embodiment shown in FIG. 16, while continuously transporting the strip-shaped composite body 10, one surface thereof is brought into contact with the outer surface of the peripheral surface portion of the cylindrical roll 223, and the peripheral surface portion and the pressure are applied. The laser beam is transmitted through the peripheral surface portion serving as a laser beam transmitting portion while following the shape of the fusion portion 4 to be formed on the composite body 10 that is in a pressurized state by the belt 224 (pressing member). By irradiating the light 230, the sheet members 21 and 22 in a pressurized state are fused to form the fused portion 4. The left and right side portions along the conveying direction of the strip-shaped composite 10 are separated from the composite 10 by irradiation with the laser beam 230 and discarded as a trim. Further, the laser beam 230 is irradiated through the peripheral surface portion serving as a laser beam transmitting portion while following the shape of the inner fused portion 5 to be formed on the composite body 10 in a pressurized state. Thus, the sheet members 21 and 22 in a pressurized state are fused to form the inner fused portion 5, and the through hole 6 is formed inside the inner fused portion 5.

  FIG. 17 is a diagram for explaining how the inner fusion part 5 is formed on the belt-shaped composite 10 using the laser-type bonding apparatus 200. FIG. 17A schematically shows a portion 10C to be divided by the laser beam 230 of the band-shaped composite 10 and its vicinity. There is substantially no hot melt adhesive in the parting portion 10C. The division part 10C of the composite 10 in the illustrated embodiment is an inward position that is spaced a predetermined distance inward in the width direction from the left and right side edges along the transport direction A in the composite 10 before division. Such a parting plan portion 10 </ b> C is a two-layer structure portion in which the first sheet member 21 and the second sheet member 22 are overlapped.

  In the planned split portion 10C of the two-layer structure in the band-shaped composite 10, any one or all of the first sheet member 21 and the second sheet member 22 are sheets that absorb the laser beam 230 and generate heat. Good. In the illustrated embodiment, all of the two sheet members 21 and 22 constituting the parting portion 10C are sheets (nonwoven fabrics) that generate heat by absorbing the laser beam 230. Further, the first sheet member 21 and the second sheet member 22 that overlap each other in the parting portion 10C and the vicinity thereof are not joined by the hot melt adhesive.

  As shown in FIG. 17 (b), the band-shaped composite 10 rotates in the direction of arrow A with one surface 10 a coming into contact with the peripheral surface portion of the cylindrical roll 223. At that time, the pressure belt 224 is pressed against the other surface 10b of the composite 10 to be pressurized (compressed) in the thickness direction while being conveyed in the arrow A direction. Then, the laser beam 230 is irradiated to the parting portion 10C that is in a pressurized state under conveyance through a peripheral surface portion that is a laser beam transmitting portion. As described above, the irradiation point of the laser beam 230 is configured to be arbitrarily movable within the circumferential surface of the cylindrical roll 223, and is set so as to follow the shape of the inner fused portion 5 to be formed. Therefore, the laser beam 230 is continuously irradiated for a certain period of time while the composite 10 is being transported to the parting portion 10C.

  When the laser beam 230 is irradiated to the parting planned portion 10C of the two-layer structure, the forming materials (fibers, etc.) of the sheet members 21 and 22 existing in the parting planned part 10C are vaporized by the heat generated by the direct irradiation of the laser light 230. The forming material that has disappeared and is present in the vicinity of the portion 10C to be divided is indirectly heated by the laser beam 230 and melted. As a result, as shown in FIG. 17C, the two-layer structure portion 10C to be cut is melted to form the through hole 6 on the inner side, and at the same time, the cutting edges of the two sheet members 21 and 22 The inner portions 5 are formed by fusing each other.

  As with the inner fusion part 5, the fusion part 4 is also formed by setting the irradiation point of the laser beam 230 so as to follow the shape of the fusion part 4 to be formed. That is, by irradiation with the laser beam 230, the left and right side portions along the transport direction of the belt-shaped composite 10 are melted to form the fused portions 4 on both sides, and the fused portions 4 are formed on both sides. Also, the outer portion in the width direction is discarded as a trim. Further, by irradiation of the laser beam 230, the end portions are intermittently melted along the width direction orthogonal to the conveying direction of the band-shaped composite 10, thereby forming the fused portions 4 at both end portions and the individual absorption. It divides | segments into the body 1A and the absorber 1A in which the fusion | melting part 4 was formed over the perimeter is manufactured continuously.

  The cut edges of the first sheet member 21 and the second sheet member 22 are heated and melted during the irradiation of the laser beam 230 and immediately after the irradiation, but are cut by the irradiation of the laser beam 230. Is a material that forms the cutting edge (fibers, etc.) after the irradiation is completed, while it is rapidly cooled and solidified by the outside air while the pressurized state by the peripheral surface portion of the cylindrical roll 223 and the pressure belt 224 is maintained. Becomes the fused portion 4 or the inner fused portion 5 which are fused and integrated. If necessary, the cutting edges of the sheet members 21 and 22 are forcibly cooled using a known cooling means such as a suction device or an exhaust device to promote the formation of the fused portion 4 or the inner fused portion 5. Also good.

The laser beam 230 will be described. The laser beam 230 applied to the band-shaped composite 10 is a laser having a wavelength that is absorbed by the first sheet member 21 and the second sheet member 22 constituting the composite 10 and generates heat. Use light. Whether the laser beam to be irradiated has a wavelength that is absorbed by the sheet member and generates heat for the first sheet member 21 and the second sheet member 22 constituting the composite 10 is determined by the material of the sheet member. And the wavelength of the laser beam used. When the 1st sheet member 21 and the 2nd sheet member 22 which constitute composite 10 are synthetic resin nonwoven fabric and a film generally used for manufacture of absorbent articles (sanitary goods), such as a disposable diaper and a sanitary napkin As the laser light, a CO ₂ laser, a YAG laser, an LD laser (semiconductor laser), a YVO ₄ laser, a fiber laser, or the like is preferably used. In addition, when the first sheet member 21 and the second sheet member 22 constituting the composite 10 include polyethylene, polyethylene terephthalate, polypropylene, or the like as a synthetic resin, the sheet member is favorably absorbed by the sheet member. As the wavelength to be obtained, it is preferable to use, for example, 8.0 μm or more and 15.0 μm or less, and it is particularly preferable to use the oscillation wavelength of the CO ₂ laser in which a high-power laser device exists is 9.0 μm or more and 11.0 μm or less. . The spot diameter of laser light, laser output, and the like can be appropriately selected in consideration of the material and thickness of the first sheet member 21 and the second sheet member 22 constituting the composite 10.

  As described above, the method for manufacturing the absorber 1A of the first embodiment using the laser bonding apparatus 200 has been described in detail, but the absorbers 1B to 1D of the second to fourth embodiments are also the absorber of the first embodiment. Similarly to 1A, it can be manufactured using a laser-type bonding apparatus 200. In addition, regarding the absorbent body 1D of the fourth embodiment, the absorbent polymer 3 is disposed on a belt-like sheet member 23 continuously supplied from a raw fabric roll (not shown), and then the left and right along the conveyance direction. A band-shaped composite formed by folding the side edges is used.

  The absorber of the present invention is not limited to the absorbers 1A to 1D of the first to fourth embodiments described above, and can be appropriately changed. Moreover, each component in the absorber 1A-1D of the above-mentioned 1st-4th embodiment can be implemented in combination suitably in the range which does not impair the meaning of this invention.

  For example, in the absorbent bodies 1A to 1D of the first to fourth embodiments, the absorbent material is formed only from the absorbent polymer 3, but may contain pulp or the like in addition to the absorbent polymer 3. Good. Moreover, although the absorptive polymer 3 is being fixed to the 1st sheet member 21 or the 2nd sheet member 22 with the hot-melt-type adhesive agent, it does not need to be fixed.

  Moreover, the shape of the inner side fusion | fusion part 5 currently formed in absorber 1A-1B of 1st-2nd embodiment is not restricted to the shape shown in FIG.1 and FIG.7, Various shapes may be sufficient. Moreover, the number of the inner side fusion | fusion parts 5 is not restricted to the number shown in FIG.1 and FIG.7. Moreover, the shape of the through-hole 6 is changed to the same shape with the shape of the inner side fused part 5. Moreover, the number of the cells 7 is also changed with the number of the inner side fusion | fusion parts 5. FIG.

  Moreover, as for the disposable diaper using the absorber of this invention, the exterior body 103 is not divided | segmented into the abdominal part A and the back part B as shown in FIG. Although it had a continuous shape such as an hourglass shape over the side portion B, the exterior body is not limited to such a continuous shape, for example, a ventral sheet placed on the wearer's ventral side (front side) Divided into a member and a dorsal sheet member arranged on the back side (rear side) of the wearer, and the absorbent main body having the absorbent body of the present invention is bridged between these two sheet members and fixed A pants-type disposable diaper having a type of exterior body may be used.

  The absorbent article using the absorbent body of the present invention may be a deployable disposable diaper other than a pants-type disposable diaper, or may be a sanitary napkin, a urine pad, a panty liner, or the like.

  The following absorber is further disclosed regarding embodiment mentioned above.

<1>
A vertically long absorbent body for an absorbent article in which an absorbent material is wrapped with a sheet member containing a heat-fusible synthetic resin,
The absorbent body is formed in a bag shape by forming a fusion part formed by fusing the sheet members to at least a part of the entire periphery of the absorbent body.
The fusion part is an absorber having a thickness / width value of 1 or more, which is a ratio of thickness to width.

<2>
The said sheet | seat member is an absorber as described in said <1> currently formed by using heat-synthetic synthetic resin as a main component.
<3>
On the inner side of the entire circumference of the absorbent body, it has an inner fusion part formed by fusing the sheet members, and a through hole is formed inside the inner fusion part,
The inner fused part is the absorbent body according to <1> or <2>, wherein a value of thickness / width which is a ratio of thickness to width is 1 or more.
<4>
The absorbent body according to <3>, wherein the intermittent part is not substantially present in the fusion part and the inner fusion part.
<5>
The absorbent material according to any one of <1> to <4>, wherein the absorbent material is made of only an absorbent polymer.
<6>
The absorbent polymer according to <5>, wherein the absorbent polymer is fixed to the sheet member with a hot-melt adhesive.
<7>
The absorbent body according to any one of <3> to <6>, wherein the inner fusion part is formed vertically and the through hole is also formed vertically.
<8>
When the absorbent body is viewed in plan, a cell is formed in which at least a part of the periphery is surrounded by the inner fusion part on the inner side of the entire circumference, and the absorbent material is disposed inside each cell. The absorbent body according to any one of the above <3> to <7>.
<9>
<3> to <8, wherein the inner fusion part has a vertically long fusion part formed in a long vertical direction in the longitudinal direction X and a horizontal long fusion part formed in a long horizontal direction in the width direction Y. > Any one of>.
<10>
The absorbent body according to any one of <3> to <9>, wherein the width of the through hole is wider after use than before use.
<11>
The fused portion is formed by fusing the edges of the sheet member folded back from one sheet member, or by fusing the two sheet members over the entire circumference. The absorbent body according to any one of <1> to <10>, which is formed.

<12>
The absorbent body according to any one of <1> to <11>, wherein a hot melt adhesive is not substantially present in a portion where the fused portion is formed.
<13>
The term “substantially absent” means that the hot melt adhesive is not present at all.
<14>
By "not substantially present", according to <12>, which means a state where hot-melt adhesive was arranged very low basis weight ^{(0.1g / m 2 ~5g / m} 2 approximately) Absorber.
<15>
The said fusion part is an absorber in any one of said <1>-<14> formed by irradiating a laser beam.
<16>
The inner fusion part is the absorber according to any one of <3> to <15>, which is formed by irradiating laser light.
<17>
The absorbent body according to any one of <1> to <16>, wherein the fusion part has a width of 1 mm or less, preferably 0.7 mm or less.
<18>
The absorber according to any one of <3> to <17>, wherein a thickness T of each of the fused portion and the inner fused portion is 0.05 mm or more, preferably 0.1 mm or more.
<19>
Each of the fused part and the inner fused part has a thickness T / width W value of 1 or more, preferably 1.2 or more, more preferably 1.5 or more, which is a ratio of the thickness T to the width W. The absorbent according to any one of <3> to <18>, preferably 2 or more.
<20>
Each of the fused part and the inner fused part has a value of thickness T / width W, which is a ratio of thickness T to width W, of 7 or less, preferably 6 or less, more preferably 5 or less <3 The absorber according to any one of> to <19>.
<21>
The absorbent body according to any one of <3> to <20>, wherein a width W of each of the fusion part and the inner fusion part is 0.05 mm or more, preferably 0.1 mm or more.
<22>
The width | variety W of the said melt | fusion part and the said inner side melt | fusion part is 1 mm or less, Preferably it is 0.7 mm or less, The absorber in any one of said <3>-<21>.
<23>
T, which is the ratio of the thickness T of the fused portion and the inner fused portion to the total thickness Tt, where Tt is the total thickness of the sheet members constituting the fused portion and the inner fused portion. The absorber according to any one of <3> to <22>, wherein the value of / Tt is 0.5 or less, preferably 0.4 or less.
<24>
T, which is the ratio of the thickness T of the fused portion and the inner fused portion to the total thickness Tt, where Tt is the total thickness of the sheet members constituting the fused portion and the inner fused portion. The absorber according to any one of <3> to <23>, wherein the value of / Tt is 0.005 or more, preferably 0.01 or more.
<25>
The thickness T of the fused part and the inner fused part is greater than the thickness of any one of the sheet members constituting the fused part and the inner fused part, respectively. 3>-<24> any one of absorbers.
<26>
<3> to <25> in which the thickness T of the fused part and the inner fused part is larger than any of the individual sheet members constituting the fused part and the inner fused part, respectively. The absorber of any one.
<27>
The space | interval of the said melt | fusion part and the said absorptive material is an absorber in any one of said <1>-<26> which is 10 mm or less, Preferably it is 7 mm or less.
<28>
The space | interval of the said melt | fusion part and the said absorptive material is an absorber as described in any one of said <1>-<27> which is 2 mm or more, Preferably it is 4 mm or more.
<29>
When the fusion part is viewed in a longitudinal section along the thickness direction Z, the outer edge of the fusion part has an arc shape protruding inward along the longitudinal direction X of the absorber <1>. The absorber of any one of-<28>.
<30>
<1> to <29>, wherein the fusion part has the largest thickness in the central region along the thickness direction Z of the absorber, and the thickness gradually decreases from the central region toward the side. Any one of these.
<31>
The absorbent body according to any one of <1> to <30>, wherein the fusion part is formed in such a crescent shape or a half moon shape.
<32>
A disposable diaper using the absorbent body according to any one of <1> to <31>,
The disposable diaper comprises an absorbent main body having the absorbent body, and an exterior body disposed on the non-skin facing surface side of the absorbent main body,
The said exterior body is a disposable diaper which does not have the cover member which covers the both ends of the longitudinal direction of the said absorptive main body.

  Hereinafter, the present invention will be described in more detail with reference to examples. However, the scope of the present invention is not limited to such examples.

[Example 1]
The absorber having the structure shown in FIGS. 10 and 11 was manufactured by the method shown in FIG. The first sheet member and the second sheet member were made of an air-through nonwoven fabric having a basis weight of 25 g / m ^{2 made} of fibers of polyethylene terephthalate (PET) resin and polyethylene (PE) resin (fineness 2.4 dtex). As an absorptive polymer, Nippon Shokubai Aquaric CA W151 (acrylic acid polymer sodium salt) was used, and the capacity in the absorber was 60 g / m ² . A CO2 laser was used as the laser light source. In the obtained absorbent body, the width W of the fused portion, the ratio of thickness T / width W, and the distance between the melted portion and the absorbent polymer were as shown in Table 1 below.

[Example 2]
1 and 2 was manufactured in the same manner as in Example 1 shown in FIG. The absorbent body of Example 2 includes two inner fusion parts having through holes and has three cells.

Example 3
The absorber having the configuration shown in FIGS. 7 and 8 was manufactured in the same manner as in Example 1 shown in FIG. The absorbent body of Example 3 has 12 inner fusion parts having through holes and has nine cells.

[Comparative Example 1]
In Example 1, instead of forming the fused part by laser light irradiation, an adhesive part was formed by a hot melt adhesive. A hot melt adhesive was formed by applying 20 g / m ² . In the obtained absorbent body, the width W of the bonded portion, the ratio of thickness T / width WT, and the distance between the bonded portion and the absorbent polymer were as shown in Table 1 below.

[Comparative Example 2]
In Example 1, instead of forming the fused portion by laser light irradiation, the fused portion was formed by heat sealing. The heat sealing conditions were heating setting 7, cooling setting 9, and clearance setting standard using AUTO SEALER manufactured by FUJI IMPULSE. In the obtained absorbent body, the width W of the fused part, the ratio of thickness T / width W, and the distance between the adhesive part and the absorbent polymer were as shown in Table 1 below.

[Comparative Example 3]
In Example 1, tissue paper was used as the first sheet member and the second sheet member, and an adhesive part was formed by a hot melt adhesive instead of forming the fused part by laser light irradiation. A hot melt adhesive was formed by applying 20 g / m ² . In the obtained absorbent body, the width W of the bonded portion, the ratio of thickness T / width W, and the distance between the bonded portion and the absorbent polymer were as shown in Table 1 below.

[Evaluation]
Using commercially available baby diapers (trade name “Merry's Pants Noby Noby Walker (Walker) M size”, manufactured by Kao Corporation), the absorbent bodies obtained in Examples and Comparative Examples were used instead of the absorbent bodies possessed by the diapers. The disposable diaper used for each was produced. About the disposable diaper using the absorber obtained by the Example and the comparative example, softness, polymer leakage, and air permeability were evaluated as follows. The results are shown in Table 1 below.

〔soft〕
The bending stiffness was measured with KESFB2-AUTO-A manufactured by Kato Tech. The sample is cut out with a length of 100 mm x 10 mm (length x width), where the length direction is parallel to the fused portion and the width direction is perpendicular to the fused portion so as to include the fused portion from the absorber end. It was. The cut sample was set so that the width direction was bent, and the bending recovery property was measured. The bending curvature was 2.5 cm ⁻¹ , the number of repetitions was 1, and N = 3. The smaller the bending recovery, the better the recovery from bending deformation, and the softness and elasticity.

[Polymer leak]
Hold the absorber by hand so that the welding surface is on the lower side of the black mount, shake the absorber 10 times, and visually check whether there is any polymer falling on the black mount. When the polymer was on the black mount, the polymer was present, and when the polymer was not on the black mount, the polymer was absent. Measurement was performed at N = 1.
○: No polymer leakage ×: No polymer leakage

(Breathability)
KES-F8-AP1 AIR PERMEABILITY TESTER (manufactured by KATOTECH) sandwiched a sample cut to 30mm x 30mm or more from the ventral part or the dorsal part to include the end region and the edge, and measured the ventilation resistance (R) Went. When the cut samples were stacked in multiple layers, the measurement was carried out while the multiple sheets were stacked. The obtained value was applied to the following formula and converted into air permeability (S).
S = 12.5 / R

  As is apparent from the results shown in Table 1, the diaper using the absorbent body of each example is less likely to give the user a sense of discomfort and the air permeability is less likely to be inhibited than the diaper using the absorbent body of each comparative example. It was found that comfort was improved. Moreover, the diaper using the absorber of each Example has a ratio of the thickness (T) / width (W) of the fused portion of 1 or more compared to the diaper using the absorber of each comparative example, and the absorption It has been found that it is difficult to inhibit swelling of the functional polymer, and comfort is improved.

1A to 1D Absorbent body 2 Sheet member 21 First sheet member 22 Second sheet member 3 Absorbent polymer 4 Fused portion 5 Inner fused portion 51 Longitudinal fused portion 52 Horizontally fused portion 6 Through hole 61 Longitudinal through hole 62 Horizontally long Through-hole 7 Cell 10 Composite 101 Pants-type disposable diaper 102 Absorbent body 121 Top sheet 122 Back sheet 103 Exterior body 131 Outer layer sheet 132 Inner layer sheet 104 Side seal part 108 Waist opening 109 Leg opening 200 Laser type bonding device 223 Cylinder Roll 230 Laser beam 235 Irradiation head 224 Pressure belt 226 Belt type pressure device

Claims (12)

A vertically long absorbent body for an absorbent article in which an absorbent material is wrapped with a sheet member containing a heat-fusible synthetic resin,
The absorbent body is formed in a bag shape by forming a fusion part formed by fusing the sheet members to at least a part of the entire periphery of the absorbent body.
The fusion part is an absorber having a thickness / width value of 1 or more, which is a ratio of thickness to width. On the inner side of the entire circumference of the absorbent body, it has an inner fusion part formed by fusing the sheet members, and a through hole is formed inside the inner fusion part,
The absorbent body according to claim 1, wherein the inner fusion part has a thickness / width value of 1 or more, which is a ratio of thickness to width.   The absorbent body according to claim 1, wherein the absorbent material is made of only an absorbent polymer.   The absorber according to claim 3, wherein the absorbent polymer is fixed to the sheet member with a hot-melt adhesive.   The absorber according to any one of claims 2 to 4, wherein the inner fusion part is formed in a vertically long shape, and the through hole is also formed in a vertically long shape.   When the absorbent body is viewed in plan, a cell is formed in which at least a part of the periphery is surrounded by the inner fusion part on the inner side of the entire circumference, and the absorbent material is disposed inside each cell. The absorber according to any one of claims 2 to 5.   The said through-hole is an absorber of any one of Claims 2-6 in which the width | variety after use becomes wider compared with before use.   The fused portion is formed by fusing the edges of the sheet member folded back from one sheet member, or by fusing the two sheet members over the entire circumference. The absorber according to any one of claims 1 to 7, which is formed.   The absorbent body according to any one of claims 1 to 8, wherein a hot-melt adhesive is not substantially present in a portion where the fused portion is formed.   The absorber according to any one of claims 1 to 9, wherein the fusion part is formed by irradiating a laser beam.   The said inner side fusion | melting part is an absorber of any one of Claims 2-10 formed by irradiating a laser beam. A disposable diaper using the absorbent body according to any one of claims 1 to 11,
The disposable diaper comprises an absorbent main body having the absorbent body, and an exterior body disposed on the non-skin facing surface side of the absorbent main body,
The said exterior body is a disposable diaper which does not have the cover member which covers the both ends of the longitudinal direction of the said absorptive main body.

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