JP2017029636A - Manufacturing method of composite stretchable member and manufacturing device of composite stretchable member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a manufacturing method of a composite stretchable member which prevents the composite stretchable member from being cut completely during conveyance by making a substrate sheet adhered with an elastic body hard to be damaged and which can improve productivity.SOLUTION: The manufacturing method of a composite stretchable member 1 of the invention includes a non-elastic area formation step of conveying a precursor 1b of the composite stretchable member between a cut roll 31 and an anvil roll 32 and forming a non-elastic area NET by pressure-cutting an elastic member 11 constituting the precursor 1b. The cut roll 31 includes on a peripheral face 31f a projection part 33 for cutting the elastic member. The projection part 33 extends across all of the plural elastic members 11 arranged at intervals in a width direction X and is divided at a position corresponding to the largest interval t1 among the intervals between the adjacent elastic members 11. The projection part 33 has a constant linear pressure in a roll axial direction X when pressure-cutting each of the elastic members 11.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a method for manufacturing a composite elastic member and an apparatus for manufacturing a composite elastic member.

  Conventionally, various methods for manufacturing a composite stretchable member in which an elastic region is given only to a necessary portion have been proposed (Patent Documents 1 to 2).

  For example, in Patent Document 1, a hot melt adhesive is applied to at least one of the upper and lower sheets, and an elastic member is sandwiched between the upper and lower sheets in a stretched state to form a laminate, and the convex groups are staggered. The laminated body is allowed to pass between the embossed heat roll and the opposing roll, and the upper and lower sheets are heat sealed by the convex group of the embossed heat roll to form a sealed portion. The manufacturing method of the elastic sheet which heats and cut | disconnects the elastic member which existed in is described.

  In addition, regarding the above-described method for producing a composite elastic member, the applicant first forms a laminate having an adhesive portion and a non-adhesive portion in which a thread-like elastic body is stuck in an expanded state on a base sheet. Then, a method of manufacturing a composite stretchable member that pressurizes and cuts only the elastic body of the non-bonded portion in the laminate is proposed (see Patent Document 2).

JP 2002-35029 A JP 2000-26015 A

  According to the method for producing an elastic sheet described in Patent Document 1, the elastic member sandwiched between the upper and lower sheets can be cut. However, since the convex portion group of the embossed heat roll is simply arranged over the entire axial width of the embossed heat roll, the upper and lower sheets sandwiching the elastic member are damaged when the elastic member is cut. If the upper and lower sheets sandwiching the elastic member are damaged in this way, the elastic sheet may be completely divided during conveyance, and the productivity of the elastic sheet cannot be improved.

  According to the manufacturing method of the composite elastic member described in Patent Document 2, it is difficult to damage the base sheet to which the thread-like elastic body is stuck, and only the thread-like elastic body can be cut. However, it is difficult to further damage the base material sheet with the elastic body attached, and the composite elastic member is prevented from being completely divided during transportation, and the productivity of the composite elastic member is to be further improved. There was a need.

  Therefore, this invention is providing the manufacturing method of the composite elastic member which can eliminate the fault which the prior art mentioned above has. Moreover, this invention is providing the manufacturing apparatus of the composite elastic member which can eliminate the fault which the prior art mentioned above has.

  The present invention is a method for manufacturing a composite stretchable member in which an elastic region that exhibits elastic stretchability and a non-elastic region that does not exhibit elastic stretchability are alternately formed in the transport direction, and is continuously transported in the transport direction. A composite stretchable member precursor in which a plurality of elastic members are arranged at regular intervals in the width direction perpendicular to the transport direction between the base material sheets to be adhered and are stretched along the transport direction. A precursor forming step to be formed, and a precursor of the composite stretchable member is conveyed between a cut roll and an anvil roll, and a plurality of the elastic members constituting the precursor are cut by pressure and the inelastic A non-elastic region forming step of forming a region, and the cut roll has a protruding portion for cutting an elastic member on a peripheral surface thereof, and the protruding portion of the cut roll is spaced apart in the width direction. To all of the plurality of elastic members arranged And is divided at a position corresponding to the widest interval between the adjacent elastic members, and the raised portion of the cut roll pressurizes and cuts the elastic member. The present invention provides a method for producing a composite stretchable member in which the linear pressure in the roll axis direction is constant.

  The present invention is also a manufacturing apparatus for a composite stretchable member in which an elastic region that exhibits elastic stretchability and a non-elastic region that does not exhibit elastic stretchability are alternately formed in the transport direction. Precursor of a composite stretchable member in which a plurality of elastic members are arranged with a gap between them in the width direction orthogonal to the transport direction between the transported substrate sheets and are stretched along the transport direction. A body is transported between a cut roll and an anvil roll, and comprises a non-elastic region forming part for forming the non-elastic region by pressing and cutting the plurality of elastic members constituting the precursor, The cut roll has a raised portion for cutting an elastic member on a peripheral surface thereof, and the raised portion of the cut roll extends over all of the plurality of the elastic members arranged at intervals in the width direction. The elastic members extending and adjacent to each other It is divided at a position corresponding to the widest interval among the intervals of the folds, and the protruding portion of the cut roll has a constant linear pressure in the roll axis direction when the elastic member is pressure-cut. An apparatus for manufacturing a composite elastic member is provided.

  According to the present invention, it is further difficult to damage the base material sheet to which the elastic body is adhered, and the composite elastic member is prevented from being completely divided during transportation, and the productivity of the composite elastic member is further increased. Can be improved.

FIG. 1 is a perspective view schematically showing one embodiment of a manufacturing apparatus for a composite elastic member used in the method for manufacturing a composite elastic member of the present invention and a manufacturing process for a composite elastic member using the same. FIG. 2 is a perspective view schematically showing a raised portion for cutting an elastic member of the inelastic region forming portion in the manufacturing apparatus shown in FIG. FIG. 3 is an explanatory diagram for explaining the arrangement of the protruding portions for cutting the elastic member included in the manufacturing apparatus shown in FIG. 2. FIG. 4 is an explanatory diagram for explaining another arrangement of the protruding portions for cutting the elastic member. FIG. 5 is a perspective view schematically showing a pressing portion of the inelastic region forming portion in the manufacturing apparatus shown in FIG. FIG. 6 is an explanatory diagram for explaining an arrangement of a plurality of convex portions for cutting an elastic member included in a pressurizing unit included in the manufacturing apparatus illustrated in FIG. 5. 7 (a) is a partially broken perspective view schematically showing the composite elastic member manufactured by the manufacturing apparatus shown in FIG. 1, and FIG. 7 (b) is manufactured from the composite elastic member shown in FIG. 7 (a). It is a partially broken perspective view which shows typically the made elastic member piece. FIG. 8 is a partially broken plan view in which a main part of the disposable diaper using the elastic member piece shown in FIG. 7B is enlarged.

Hereinafter, the present invention will be described based on preferred embodiments with reference to the drawings. FIG. 1 schematically shows a manufacturing apparatus 100 (hereinafter also simply referred to as “manufacturing apparatus 100”) according to a preferred embodiment of a manufacturing apparatus for a composite elastic member of the present invention.
In the following description, the direction in which the base sheet 10 is transported will be described as the Y direction, the width direction orthogonal to the transport direction, and the width direction of the strip-shaped base sheet 10 to be transported will be described as the X direction. In addition, the roll axis direction mentioned later and the width direction (X direction) of the base material sheet 10 correspond.

  The manufacturing apparatus 100 is a manufacturing apparatus for the composite elastic member 1 in which elastic regions ET that exhibit elastic stretchability and non-elastic regions NET that do not exhibit elastic stretchability are alternately formed in the transport direction (Y direction). As shown in FIG. 1, the manufacturing apparatus 100 includes a precursor forming portion 20 that forms the precursor 1b of the composite stretchable member 1 and an inelastic region formation that forms the inelastic region NET from the upstream side toward the downstream side. Part 30. In the manufacturing apparatus 100, the precursor forming unit 20 includes an adhesive application unit 21, a pair of nip rolls 22 and 23, and a folded plate 24 from the upstream side toward the downstream side. In the manufacturing apparatus 100, the inelastic region forming unit 30 includes a cut roll 31 and an anvil roll 32.

  One embodiment of the method for manufacturing a composite elastic member of the present invention is based on a manufacturing method for continuously manufacturing the composite elastic member 1 using a manufacturing apparatus 100 including a precursor forming unit 20 and an inelastic region forming unit 30. explain.

  In the manufacturing apparatus 100, the adhesive coating unit 21 of the precursor forming unit 20 is a known adhesive coating machine, and an adhesive coating nozzle is directly brought into contact with the thread-like elastic member 11 to be conveyed, so that the adhesive is applied. This is a portion to be applied to the surface of the elastic member 11. The adhesive application unit 21 can apply the adhesive continuously or intermittently to the surface of the elastic member 11, and the manufacturing apparatus 100 applies the adhesive intermittently to the surface of the elastic member 11. Yes. Preferably, in the manufacturing apparatus 100, the adhesive application unit 21 applies an adhesive to the surface of the elastic member 11 corresponding to the elastic region ET that exhibits elastic stretchability, and the non-elastic region that does not exhibit elastic stretchability. The adhesive is intermittently applied to the surface of the elastic member 11 without applying the adhesive to the surface of the elastic member 11 corresponding to NET.

  In the manufacturing method of the composite elastic member 1 using the manufacturing apparatus 100, first, as shown in FIG. 1, using the precursor formation part 20 of the manufacturing apparatus 100, it conveys continuously in a conveyance direction (Y direction). A composite in which a plurality of elastic members 11 are arranged in the width direction (X direction) between the base material sheets 10 and 10 with a constant spacing therebetween and are stretched along the transport direction (Y direction). The elastic member precursor 1b is formed (precursor forming step). Preferably, first, the adhesive is intermittently applied to the surface of the plurality of thread-like elastic members 11 to be conveyed using the adhesive application nozzle of the adhesive application unit 21. At the same time, while continuously transporting the strip-shaped base sheet 10 in the transport direction (Y direction), the width is wider than the position of the bisector passing through the center of the strip-shaped base sheet 10 in the width direction (X direction). A plurality of elastic members 11 coated with an adhesive are arranged on the upper surface on one end side in the direction (X direction) in the width direction (X direction) with a constant spacing therebetween and in the transport direction (Y direction). Along the stretched state. Here, the said bisector is a center line that bisects the base sheet 10 in the width direction (X direction) and extends in the transport direction (Y direction).

Examples of the base sheet 10 to be used include woven fabrics, nonwoven fabrics, knitted fabrics, resin films, papers, and the like, and nonwoven fabrics are preferably used when producing a composite elastic member used for absorbent articles. Examples of the fibers constituting the nonwoven fabric include synthetic fibers such as polyester such as polyethylene (PE), polypropylene (PP) and polyethylene terephthalate (PET) and polyamide such as nylon, regenerated cellulose fibers such as rayon and cupra, and the like. Examples include natural fibers such as cotton. Moreover, as a manufacturing method of a nonwoven fabric, various nonwoven fabrics, such as a spun bond nonwoven fabric, a melt blown nonwoven fabric, a spunlace nonwoven fabric, and a needle punch nonwoven fabric, can be used. The basis weight of the nonwoven fabric is preferably 10 to 50 g / ^{m 2,} and still more preferably from 15 to 30 g / ^{m 2.}

  Moreover, as the elastic member 11 to be used, the elastic member (for example, thread-like thing) of the various raw materials and form conventionally used for the absorbent article can be used, for example. Examples of the material for forming the elastic member 11 include polyurethane elastic fibers (spandex), natural rubber, and synthetic rubber. When the thread-like elastic member 11 is in a thread form, the thickness is preferably 300 to 680 dtex, and more preferably 400 to 550 dtex. Moreover, when the thread-like elastic member 11 is in the form of a belt, the thickness is preferably 0.01 to 0.1 mm, and more preferably 0.02 to 0.05 mm. The expansion ratio of the elastic member 11 is preferably 1.5 to 4.5 times the natural length.

Moreover, as an adhesive agent to be used, the various adhesive agent conventionally used for an absorbent article can be used, for example, For example, a hot-melt-type adhesive agent can be used preferably. Examples of the hot melt adhesive include styrene and olefin. Styrene-based hot melt adhesives include styrene-butadiene-styrene copolymer (SBS), styrene-isoprene-styrene copolymer (SIS), and styrene-ethylene-butylene-styrene copolymer that is a hydrogenated product of SBS. (SEBS) and blended hot-melt adhesives obtained by blending two or more of these can be used. The coating amount of hot-melt adhesive agent is preferably 0.01 g / ^{m 2} or more 0.05 g / ^{m 2} or less, further preferably 0.015 g / ^{m 2} or more 0.03 g / ^{m 2} or less .

  Next, as shown in FIG. 1, the other end in the width direction (X direction) than the position of the bisector passing through the center in the width direction (X direction) in the band-shaped base sheet 10 using the folded plate 24. The part side (the end part side opposite to the one end part side) is folded back, and the belt-like substrate sheet 10 is folded in the width direction (X direction). Then, the base material sheet 10 folded in half is conveyed and pressed between the nip rolls 22 and 23, and the base material sheets 10 and 10 folded in half and the plurality of elastic members 11 are integrated. As described above, using the precursor forming unit 20 of the manufacturing apparatus 100, a plurality of elastic members 11 are arranged at intervals in the width direction (X direction) between the base material sheets 10 and 10, and in the transport direction. The precursor 1b of the composite elastic member pasted in the extended state along (Y direction) is formed.

  Here, in the precursor 1b of the composite elastic member, the plurality of elastic members 11 are not spaced apart from each other but are spaced apart from each other when the interval between the elastic members 11, 11 adjacent in the width direction (X direction) is. It means a form in which they are all different, or a form in which the distance between at least one pair of elastic members 11, 11 is different from the distance between other elastic members 11, 11. In the composite elastic member precursor 1b of the present embodiment, the interval t1 between the pair of elastic members 11, 11 is larger than the interval t2 between the other elastic members 11, 11, and the interval t1 and the interval t2 are different. (See FIG. 3).

Regarding the precursor 1b of the composite elastic member, the length (L1) in the width direction (X direction) of the precursor 1b is preferably 30 mm or more, more preferably 35 mm or more, and preferably 100 mm or less, more preferably 90 mm or less. Specifically, it is preferably 40 mm or more and 70 mm or less, and more preferably 45 mm or more and 55 mm or less.
Moreover, the ratio ((t1 / L1) × 100) of the distance (t1) between the pair of elastic members 11, 11 to the length (L1) in the width direction (X direction) of the precursor 1b of the composite elastic member is 3% or more is preferable, 5% or more is more preferable, 20% or less is preferable, 18% or less is more preferable, specifically, 8% or more and 15% or less is preferable, and 10% or more and 12% or less is preferable. Further preferred.
Preferably, the distance t1 between the pair of elastic members 11, 11 is preferably 3 mm or more, more preferably 5 mm or more, and preferably 40 mm or less, more preferably 30 mm or less, specifically, 8 mm or more and 20 mm or less. Is preferably 10 mm or more and 15 mm or less.
Further, the distance t2 between the other elastic members 11, 11 is preferably 1.5 mm or more, more preferably 2.5 mm or more, and preferably 20 mm or less, more preferably 15 mm or less, specifically 4 mm or more. It is preferably 10 mm or less, and more preferably 5 mm or more and 7.5 mm or less.
The number of elastic members 11 included in the composite elastic member precursor 1b is preferably 3 or more, more preferably 4 or more, and preferably 20 or less, more preferably 15 or less, specifically 5 The number is preferably 12 or more and more preferably 6 or more and 10 or less.

  Next, in the method for manufacturing the composite elastic member 1 using the manufacturing apparatus 100, as shown in FIG. 1, a composite is formed between the cut roll 31 and the anvil roll 32 using the inelastic region forming part 30 of the manufacturing apparatus 100. The elastic member precursor 1b is conveyed, and a plurality of elastic members 11, 11,... Constituting the precursor 1b are pressed and cut to form an inelastic region NET (inelastic region forming step). The cut roll 31 and the anvil roll 32 included in the inelastic region forming unit 30 are metal rolls. The cut roll 31 has a raised portion 33 for cutting the elastic member 11 on its peripheral surface 31f.

  As shown in FIGS. 1 to 3, the raised portion 33 of the cut roll 31 extends over all of the plurality of elastic members 11, 11,... Spaced apart in the width direction (X direction). It extends and is divided at a position corresponding to the widest interval t1 in the interval between the adjacent elastic members 11 and 11. In the manufacturing apparatus 100, only the interval t1 between the pair of elastic members 11, 11 is larger than the interval t2 between the other elastic members 11, 11, so that the raised portion 33 is in the roll axis direction (X direction). .., While extending over all of the plurality of elastic members 11, 11,... And separated only at a position corresponding to the interval t1. The raised portion 33 of the cut roll 31 has a constant linear pressure in the roll axis direction (X direction) when the elastic members 11 are pressure-cut.

  Preferably, in the method of manufacturing the composite elastic member 1 using the manufacturing apparatus 100, as shown in FIG. 1, when the composite elastic member precursor 1b is conveyed, the raised portion 33 of the cut roll 31 and the anvil roll 32 Are in a state of facing each other. As a result, the precursor 1b of the composite elastic member is pressed by the pressing of the raised portion 33 of the cut roll 31 and the anvil roll 32, and the raised portion 33 extends over all of the plurality of elastic members 11, 11,. , The plurality of elastic members 11, 11,... In the precursor 1b of the composite stretchable member are all cut, and each elastic member 11 is cut at one place. Since the adhesive is intermittently applied to the surface of each elastic member 11 in the transport direction (Y direction), the stretched elastic member 11 is released by the above-described cutting, and the stretched state is released, so that the transport direction starts from the cutting position. Shrink before and after (Y direction). In this way, the non-elastic region NET that does not exhibit elastic stretchability is formed, and the elastic region ET that exhibits elastic stretchability and the non-elastic region NET that does not exhibit elastic stretchability are alternately arranged in the transport direction (Y direction). The formed composite elastic member 1 is manufactured. Further, as described above, in the method of manufacturing the composite elastic member 1 using the manufacturing apparatus 100, the adhesive is applied to the surface of the elastic member 11 corresponding to the elastic region ET, and the elastic member 11 corresponding to the non-elastic region NET. In the elastic region ET, the base material sheets 10 and 10 folded in two are fixed through the adhesive applied to the surface of the elastic member 11 in the elastic region ET. In the area NET, since the adhesive is not applied to the surface of the elastic member 11, the base sheets 10, 10 folded in two are not fixed.

  As described above, the protruding portion 33 of the cut roll 31 has a constant linear pressure in the roll axis direction (X direction) when the elastic members 11 are pressure-cut. Here, the constant linear pressure means, in other words, the length L2 in the roll axial direction (X direction) of the raised portion 33 of the cut roll 31 is always constant, and the raised portion 33 of the cut roll 31 is the anvil roll 32. This means that each elastic member 11 is pressed and cut. The length L2 of the raised portion 33 in the roll axis direction (X direction) is not particularly limited as long as it is constant. For example, as shown in FIG. 4, the raised portion 33 of the cut roll 31 extends over all of the plurality of elastic members 11, 11,... When separated only at the position corresponding to t1, the length in the roll axis direction (X direction) of the part of the one raised part 33 divided and the roll of the other part of the other raised part 33 divided The total value with the length in the axial direction (X direction) is the length L2 in the roll axial direction (X direction).

  In the manufacturing apparatus 100, the linear pressure in the roll axis direction (X direction) when the protruding portion 33 of the cut roll 31 presses and cuts each elastic member 11 is the viewpoint of the size of the actuator and the cutability of the elastic member 11. To 3000 N / cm or more, preferably 5000 N / cm or more, more preferably 20000 N / cm or less, further preferably 18000 N / cm or less, specifically 10,000 N / cm or more and 16000 N / cm or less, More preferably, it is 12000 N / cm or more and 13000 N / cm or less.

In the manufacturing apparatus 100, the length (L3) (see FIG. 3) of the divided portion 33d of the raised portion 33 of the cut roll 31 in the roll axis direction (see FIG. 3) is shorter than the interval t1 between the pair of elastic members 11 and 11. It is preferably 2 mm or more, more preferably 3 mm or more, and preferably 35 mm or less, more preferably 25 mm or less, specifically preferably 5 mm or more and 15 mm or less, and more preferably 8 mm or more and 10 mm or less.
Also, from the viewpoint of damage to the base sheet 10, the roll of the divided portion 33d of the raised portion 33 of the cut roll 31 with respect to the length (L1) in the width direction (X direction) of the precursor 1b of the composite stretchable member The ratio of the length (L3) in the axial direction ((L3 / L1) × 100) is preferably 5% or more, and more preferably 10% or more.

  In the manufacturing apparatus 100, the conveyance speed of the composite elastic member precursor 1 b is 50 m / min from the viewpoint of cutting only each elastic member 11 without damaging the base material sheet 10 in the composite elastic member precursor 1 b as much as possible. The above is preferable, 100 m / min or more is more preferable, 300 m / min or less is preferable, 280 m / min or less is more preferable, specifically, 100 m / min or more and 250 m / min or less is preferable, 120 m / min or more and 200 m or less. / Min or less is more preferable.

  In the manufacturing apparatus 100, in the non-elastic region forming part 30, the raised part of the cut roll 31 is used from the viewpoint of cutting only each elastic member 11 without damaging the base sheet 10 in the precursor 1b of the composite elastic member as much as possible. It is preferable that 33 can be heated. In the manufacturing method of the composite elastic member 1 using the manufacturing apparatus 100, in the inelastic area | region formation process, it is preferable to heat the protruding part 33 of the cut roll 31, and to pressure-cut the elastic member 11. FIG. From the above viewpoint, the heating temperature of the raised portion 33 is preferably 110 ° C. or higher, more preferably 120 ° C. or higher, more preferably 180 ° C. or lower, still more preferably 170 ° C. or lower, and specifically 130 ° C. or higher and 165 ° C. The following is preferable, and 140 ° C to 160 ° C is more preferable.

  In the manufacturing apparatus 100, as shown in FIGS. 1, 5, and 6, the cut roll 31 is arranged on the peripheral surface 31f with a space in the circumferential direction from the raised portion 33 in addition to the raised portion 33. The pressure member 34 has a plurality of convex portions 341 for cutting the elastic member. As shown in FIG. 5, the pressing portion 34 of the cut roll 31 has a plurality of elastic members 11 on one end side in the width direction (X direction) from the position of the interval t <b> 1 between the widest adjacent elastic members 11 and 11. , 11,... Are arranged at positions corresponding to the region T (see FIG. 6). The manufacturing apparatus 100 includes one raised portion 33 and one pressing portion 34 on the peripheral surface 31 f of the cut roll 31. In the manufacturing apparatus 100, the raised portion 33 and the pressurizing portion 34 are arranged at positions 180 ° apart on the peripheral surface 31 f of the cut roll 31.

  In the manufacturing method of the composite elastic member 1 using the manufacturing apparatus 100, as shown in FIG. 1, the precursor 1b of the composite elastic member is conveyed between the cut roll 31 and the anvil roll 32 in the inelastic region forming step. The plurality of elastic members 11, 11,... On one end side in the width direction (X direction) are pressed and cut by the pressurizing unit 34, and the plurality of convex portions 341, 341 of the pressurizing unit 34 are used. , Each elastic member 11 is cut at a plurality of locations, and the inelastic region NET is formed on one end side in the width direction (X direction) of the precursor 1b of the composite elastic member being conveyed.

  Preferably, in the cut roll 31 of the manufacturing apparatus 100, the pressurizing unit 34 includes a large number of convex portions 341, 341,. By pressing the plurality of elastic members 11, 11,..., Each elastic member 11 is divided at a plurality of locations. The pressurizing unit 34 is disposed at a position corresponding to a region T (see FIG. 6) where a plurality of elastic members 11, 11,... On one end side in the width direction (X direction) are disposed. The plurality of convex portions 341, 341,... Are distributed in a predetermined region in the circumferential direction of the cut roll 31 and the roll axial direction (X direction) in the pressurizing unit 34, and each elastic member Are arranged so that at least two or more convex portions 341, 341,... Are aligned in the circumferential direction of the cut roll 31 with respect to each elastic member 11 in the region T. .

The shape of the top of the convex portion 341 for cutting the elastic member is not particularly limited, such as a rhombus shape, an elliptical shape, a circular shape, an oval shape, or a rectangular shape, but is along the roll axis direction (X direction) of the cut roll 31. It is preferable that the length is 1 mm or more and 20 mm or less, and the length along the circumferential direction is 0.2 mm or more and 5 mm or less. Further, each convex section 341, the area of the top portion, is preferably 0.2 mm ² or more 100 mm ² or less, (Distance apexes of the convex portion 341) pitch and if the convex portions 341,341 is closest It is preferable to arrange regularly at 2 mm or more and 50 mm or less. In addition, the ratio of the total area when the tops of all the convex portions 341 included in the pressure unit 34 are viewed in plan to the area when the top of the pressure unit 34 is viewed in plan is 0.1% or more and 80% or less. It is preferably 10% or more and 50% or less.

  As described above, as shown in FIG. 1, the manufacturing apparatus 100 has the cut roll 31 provided with the raised portion 33 and the pressurizing portion 34 at positions separated by 180 °. In the manufacturing method of the composite elastic member 1 using the manufacturing apparatus 100 having the raised portion 33 and the pressing portion 34, the plurality of elastic members 11, 11,. A plurality of elastic members 11, 11,... Arranged in the region T are all cut by the non-elastic region NET where the elastic member 11 is cut at one place and the pressurizing portion 34, and each elastic member 11 is elastic. An inelastic region NET in which the member 11 is divided at a plurality of locations is formed. In the composite stretchable member precursor 1b, between the inelastic region NET formed by the raised portion 33 and the inelastic region NET formed by the pressurizing unit 34, which are adjacent to each other in the transport direction (Y direction). This region is the elastic region ET. Therefore, in the method for manufacturing the composite stretchable member 1 using the manufacturing apparatus 100, the elastic region ET that exhibits elastic stretchability and the non-elastic region NET that does not exhibit elastic stretchability are alternately formed in the transport direction (Y direction). The composite elastic member 1 (see FIG. 7A) can be manufactured continuously and efficiently. In the method of manufacturing the composite stretchable member 1 using the manufacturing apparatus 100, the base sheets 10, 10 folded in two are fixed in the elastic region ET via an adhesive applied to the surface of the elastic member 11. In the non-elastic region NET, since the adhesive is not applied to the surface of the elastic member 11, the base material sheets 10 and 10 folded in two are not fixed.

  The composite stretchable member 1 shown in FIG. 7A manufactured by the manufacturing method using the manufacturing apparatus 100 is publicly known in the cutting step (not shown) of the composite stretchable member 1 which is a subsequent step of the non-elastic region forming step. The cutting means 1 is cut at each position of the inelastic region NET formed by the raised portion 33 to obtain the elastic member piece 1P for each leaf. Alternatively, after being wound up once, it is cut for each position of the inelastic region NET formed by the raised portion 33 by a known cutting means in a separate process to obtain the elastic member piece 1P for each leaf. It is done. In addition, it may be processed as it is and may be cut by a known means at the final product stage.

  The elastic member piece 1P manufactured as described above is an elastic sheet having elasticity. Such an elastic member piece 1P contributes to the improvement of the fitting property of the diaper 5, for example, by disposing the elastic member piece 1P on the waist part of the unfolded disposable diaper 5 as shown in FIG. In particular, when the base material sheet 10 constituting the elastic member piece 1P has air permeability, not only the fit of the diaper 5 is improved, but also the anti-steaming effect is improved. The disposable diaper 5 shown in FIG. 8 has an absorbent body 53 between a liquid-permeable top sheet 51 and a liquid-impermeable or water-repellent back sheet 52, and is disposed on the back side of the wearer when worn. This is a deployable disposable diaper provided with a pair of fastening tapes 54, 54 on both the left and right side portions thereof. Each of the fastening tapes 54 has a fixing portion 54b that is fixed between the sheet 55 for forming a leak-proof cuff and the back sheet 52, and both ends in the longitudinal direction of the elastic member piece 1P are both fastening members. It arrange | positions so that it may overlap with the fixing | fixed part 54b of the tapes 54 and 54. FIG. Moreover, in the disposable diaper 5 shown in FIG. 8, it arrange | positions so that the edge part of the absorber 53 may overlap with the inelastic area | region NET formed by the pressurization part 34 in the elastic member piece 1P.

  As shown in FIGS. 1, 2, and 3, the method of manufacturing the composite stretchable member 1 using the manufacturing apparatus 100 described above includes a plurality of elastic members 11, 11, Are extended at all and are divided at a position corresponding to the widest interval t1 among the intervals between the adjacent elastic members 11 and 11. The raised portion 33 of the cut roll 31 has a constant linear pressure in the roll axis direction (X direction) when the elastic members 11 are pressure-cut. Thus, since the linear pressure of the raised portion 33 is constant, it is difficult to damage the base sheet 10 on which the elastic member 11 is stably cut and the elastic member 11 is adhered. Further, since the raised portion 33 is divided at a position corresponding to the widest interval t1 in the interval between the adjacent elastic members 11, 11, the composite elastic member 1 is completely divided during conveyance. The productivity of the composite elastic member 1 is improved.

  The manufacturing method of the composite elastic member of this invention is not restrict | limited at all to the manufacturing method of the above-mentioned embodiment, It can change suitably. Moreover, the manufacturing apparatus of the composite elastic member of this invention is not restrict | limited at all to the manufacturing apparatus of the above-mentioned embodiment, It can change suitably.

  For example, as shown in FIG. 1, the manufacturing method of the composite elastic member 1 using the manufacturing apparatus 100 described above folds one base sheet 10 using a folding plate 24, and the composite elastic member precursor 1b. However, the precursor 1b of the composite elastic member may be formed by using two base sheets 10 without using the folded plate 24. When using the two base material sheets 10, for example, a plurality of elastic members 11 coated with an adhesive on the upper surface of one base material sheet 10 are spaced apart in the width direction (X direction). And the laminated composite in which the remaining other base sheet 10 is placed in an overlapped manner in the transport direction (Y direction) is transported between the nip rolls 22 and 23 and pressed. Precursor of a composite elastic member in which a plurality of elastic members 11 are arranged at intervals in the width direction (X direction) between the material sheets 10 and 10 and are stretched along the transport direction (Y direction). The body 1b may be formed.

  Moreover, the manufacturing method of the composite elastic | stretch member 1 using the above-mentioned manufacturing apparatus 100 uses the adhesive application nozzle of the adhesive application part 21, as shown in FIG. 1, and is the thread form which conveys this adhesive application nozzle The adhesive is intermittently applied to the surface of the elastic member 11 in direct contact with the elastic member 11, but the adhesive is intermittently applied to the upper surface of the base sheet 10 in the conveying direction (Y direction). Thus, the adhesive application portion and the adhesive non-application portion may be alternately formed.

  The composite elastic member 1 manufactured by the manufacturing method of the present invention is a disposable diaper, a sanitary napkin, a body fluid absorption, in addition to the constituent materials that contribute to the elasticity of the waist of the unfoldable disposable diaper 5 shown in FIG. It can be suitably used as a constituent material of a leak-proof cuff of an absorbent article typified by a pad or the like, or a constituent material such as a top sheet, a back sheet, and an exterior material.

DESCRIPTION OF SYMBOLS 100 Manufacturing apparatus 1 Composite elastic member 1b Precursor of composite elastic member 1P Elastic member piece 10 Base material sheet 11 Elastic member 20 Precursor formation part 21 Adhesive application part 22, 23 Nip roll 24 Folding plate 30 Inelastic area formation part 31 Cut roll 32 Anvil roll 33 Raised portion 33d Divided portion of raised portion 34 Pressurizing portion 341 Convex portion 5 Unfolded disposable diaper 51 Top sheet 52 Back sheet 53 Absorber 54 Fastening tape 55 Sheet for forming leak-proof cuff ET Elastic region NET Inelastic region

Claims (8)

A method for producing a composite stretchable member in which elastic regions that exhibit elastic stretchability and non-elastic regions that do not exhibit elastic stretchability are alternately formed in the transport direction,
A plurality of elastic members are arranged in the width direction perpendicular to the transport direction between the belt-like base material sheets that are continuously transported in the transport direction, and are spaced apart from each other, and are stuck in an extended state along the transport direction. A precursor forming step of forming a precursor of the attached composite elastic member;
Inelastic region formation in which a precursor of the composite stretchable member is conveyed between a cut roll and an anvil roll, and a plurality of the elastic members constituting the precursor are cut under pressure to form the inelastic region A process,
The cut roll has a raised portion for cutting an elastic member on its peripheral surface,
The raised portion of the cut roll extends over all of the plurality of elastic members arranged at intervals in the width direction, and is the widest among the intervals between the adjacent elastic members. It is divided at a position corresponding to the interval,
The protruding portion of the cut roll is a method for producing a composite stretchable member in which the linear pressure in the roll axis direction when the elastic members are pressure-cut is constant.   Ratio (L2 / L1) × the length (L2) in the roll axis direction of the divided portion of the raised portion of the cut roll to the length (L1) in the width direction of the precursor of the composite elastic member 100) is 5% or more, The manufacturing method of the composite elastic member of Claim 1.   3. The method of manufacturing a composite stretchable member according to claim 1, wherein, in the inelastic region forming step, the protruding portion of the cut roll is heated to pressure-cut the elastic member. The cut roll has, on the peripheral surface thereof, a pressurizing part having a plurality of convex parts for cutting an elastic member, arranged in a circumferential direction from the raised part, in addition to the raised part,
The pressurizing part of the cut roll is arranged at a position corresponding to a region where a plurality of elastic members on one end side in the width direction are arranged with respect to the widest position between adjacent elastic members. ,
In the non-elastic region forming step, the precursor of the composite elastic member is conveyed between the cut roll and the anvil roll, and a plurality of elastic members on one end side in the width direction are moved by the pressure unit. The width of the precursor of the composite stretchable member being transported by cutting the elastic members at a plurality of locations at the plurality of convex portions of the pressure portion, and cutting the non-elastic regions. The manufacturing method of the composite elastic | stretch member of any one of Claims 1-3 formed in the one end side of a direction. An apparatus for producing a composite stretchable member in which elastic regions that exhibit elastic stretchability and non-elastic regions that do not exhibit elastic stretchability are alternately formed in the transport direction,
In the width direction perpendicular to the conveyance direction between the substrate sheets that are continuously conveyed in the conveyance direction, a plurality of elastic members are arranged at regular intervals, and are stuck in an extended state along the conveyance direction. A composite elastic member precursor is conveyed between a cut roll and an anvil roll, and a plurality of the elastic members constituting the precursor are cut under pressure to form the inelastic region. A forming part,
The cut roll has a raised portion for cutting an elastic member on its peripheral surface,
The raised portion of the cut roll extends over all of the plurality of elastic members arranged at intervals in the width direction, and is the widest among the intervals between the adjacent elastic members. It is divided at a position corresponding to the interval,
The raised portion of the cut roll is a manufacturing apparatus for a composite stretchable member in which the linear pressure in the roll axial direction when the elastic members are pressure-cut is constant.   Ratio (L2 / L1) of the length (L2) in the roll axis direction of the divided part of the raised portion of the cut roll to the length (L1) in the orthogonal direction of the precursor of the composite elastic member X100) is 5% or more, The manufacturing apparatus of the composite elastic | stretch member of Claim 5.   In the said inelastic area | region formation part, the said protruding part of the said cut roll can be heated, The manufacturing apparatus of the composite elastic member of Claim 5 or 6. The cut roll has, on the peripheral surface thereof, a pressurizing part having a plurality of convex parts for cutting an elastic member, arranged in a circumferential direction from the raised part, in addition to the raised part,
The pressurizing part of the cut roll is arranged at a position corresponding to a region where a plurality of elastic members on one end side in the width direction are arranged with respect to the widest position between adjacent elastic members. The manufacturing apparatus of the composite elastic | stretch member of any one of Claims 5-7.

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