JP4322140B2 - Composite elastic member and manufacturing method thereof - Google Patents

Description

  The present invention relates to a composite stretchable member that can form a gather that is flexible, soft to the touch, and has a good touch, and a method for manufacturing the same.

  In an absorbent article such as a disposable diaper and a sanitary napkin, an elastic member is joined to a sheet material in an expanded state, and the elastic member is contracted to form a gather (an elastic part having a large number of wrinkles) on the sheet material. It is widely done.

Patent Document 1 discloses an elastic stretchable sheet formed by bending a flat sheet material to form a large number of ridges that repeat peaks and valleys, and joining elastic members to the tops of a plurality of peaks of the ridges. .
Patent Document 2 discloses an elastic stretch part having a sheet material made of nonwoven fabric and an elastic member sandwiched between two layers formed by folding the sheet material, and is orthogonal to the stretch direction of the elastic member. A disposable diaper having a linear joint portion between sheet materials extending in a direction and having an elastic stretchable portion formed by joining the elastic member to the sheet material at the joint portion is described.

JP 2001-11769 A Registered Utility Model No. 2518953

However, in the sheet described in Patent Document 1, the wrinkle extends over a plurality of the elastic members and is relatively beautiful. On the other hand, the presence of the joint between the sheet material and the elastic member is present. As a result, the touch when the heel touches the skin is not so good.
On the other hand, in the elastic expansion and contraction part described in Patent Document 2, due to the linear joining part between the sheet materials, the flexibility in the direction parallel to the joining part is inferior, and the softness and touch when touching the skin are poor. There is room for improvement.

  Accordingly, an object of the present invention is to provide a composite stretchable member that can form a gather that is flexible, soft to the touch, and has a good touch, and a preferred method for producing the same.

  The present invention is a composite elastic member comprising two sheet materials and a plurality of elastic members disposed between the two sheet materials, wherein the two sheet materials are provided in the elastic direction of the elastic members and A plurality of joint lines each formed by a plurality of joint portions are formed along each of the two directions in the intersecting direction, and at least two of the elastic members extend in the extension / contraction direction. It arrange | positions so that it may overlap with each junction part which comprises the joining line along, and is fixed between the said both sheet materials in each said junction part, Each said both sheet materials are the joining lines along the cross direction of the said expansion-contraction direction. The object is achieved by providing a composite elastic member in which a ridge is formed between each other.

  The present invention is a preferred method for producing the composite elastic member, wherein a plurality of elastic members are arranged in an expanded state between two sheets, and the laminate is partially heated by a plurality of convex portions. The sheet material is partially heat-sealed so that the joint portion is formed, and the partial heating and pressurization is performed so as not to cut the elastic member. The manufacturing method of a composite elastic member is provided.

The composite stretchable member of the present invention has a gather (a stretchable part having a large number of wrinkles) that is soft and soft to the touch, and can form such a gather on an absorbent article or the like.
According to the method for producing a composite stretchable member of the present invention, a composite stretchable member having a gather (a stretchable part having a large number of wrinkles) that is soft and soft to the touch and that has a good touch can be easily produced.

Hereinafter, the present invention will be described with reference to the drawings.
As shown in FIGS. 1 and 2, the composite elastic member 1 as one embodiment of the present invention includes two sheet materials 2 and 3, and a plurality of elastic members 4 disposed between the two sheet materials. Consists of.
The composite elastic member 1 has a rectangular shape in plan view, and end seal portions 11 (only one is shown) are provided at both ends of the elastic member 4 in the extending direction. In the end seal portion 11, all the elastic members 4 are fixed in a state of being sandwiched between both sheet materials 2 and 3. The composite stretchable member 1 has a stretchable portion 10 except for the end seal portion 11.

  As shown in FIG. 2, the two sheet materials 2 and 3 are intermittently heat-sealed (joined) in both directions of the elastic member 4 in the expansion / contraction direction (X direction) and the orthogonal direction (Y direction). . The intersecting direction of the elastic member 4 with respect to the expansion / contraction direction is a direction (non-parallel direction) that forms a predetermined angle with respect to the expansion / contraction direction of the elastic member 4, and is orthogonal to the expansion / contraction direction of the elastic member 4 in this embodiment. Direction (Y direction). The crossing direction of the elastic member 4 in the expansion / contraction direction is preferably 75 ° to 105 ° when the crossing angle with the expansion / contraction direction is 90 ° when orthogonal to each other as in the present embodiment. The angle is preferably 85 ° to 95 °, particularly preferably 90 °.

  In the present embodiment, the plurality of elastic members 4 are arranged in parallel to each other, and the expansion and contraction direction of the elastic member 4 when the plurality of elastic members are arranged in parallel to each other is the direction in which the elastic member 4 extends. The same direction. The expansion / contraction direction of the elastic member 4 when the plurality of elastic members 4 are not arranged in parallel to each other is a direction orthogonal to the direction in which the flange 6 described later extends.

  As shown in FIG. 2, the composite stretchable member 1 is attached with a joint line 50 (only one is denoted by a reference numeral) in the stretchable direction (X direction) of the elastic member 4. Are formed (seven in the illustrated example), and each of the elastic members 4 includes a plurality of heat-sealing portions (joining portions) 5 in the direction perpendicular to the expansion / contraction direction (Y direction). A plurality of joining lines 51 (only one is shown with a reference numeral) are formed.

  The joining lines 50 along the expansion / contraction direction (X direction) of the elastic member 4 are formed in parallel with each other, and the joining lines 51 along the direction orthogonal to the expansion / contraction direction (Y direction) are also formed in parallel with each other. Yes. And the area | region where the heat-fusion part 5 does not exist continues between the two end line seal parts 11 (only one is shown) of the composite expansion-contraction member 1 between the two joining lines 50 along the X direction. Is formed.

From the viewpoint of improving flexibility, in the joining line (joining line extending along the intersecting direction) along the intersecting direction (Y direction in the present embodiment) of the elastic member 4 in the expansion / contraction direction, the heat fusion part (joining part) 5 The ratio (P1 / L1) between the length L1 (see FIG. 2) and the arrangement pitch P1 (see FIG. 2) of the heat-sealing part (joining part) is 1.05 to 80, particularly 1.05 to 15 It is preferable that the arrangement pitch P1 of the heat-sealed part (joint part) is 1 to 40 mm, particularly 2 to 15 mm.
From the same viewpoint, the length L1 is preferably 0.5 to 20 mm, particularly 1 to 10 mm, and the length L2 is preferably 0.5 to 30 mm, particularly 1 to 20 mm.

  From the viewpoint of forming an eyebrow 6, particularly an eyebrow 6 that looks beautifully extending continuously across a plurality of elastic members 4, a heat fusion part (joint) in a joining line along the expansion / contraction direction (X direction) of elastic member 4 Part) 5 is preferably 1 to 30 mm, particularly preferably 2 to 15 mm, and the length L3 (see FIG. 2) in the same direction of each heat-sealing part 5 is 0.1 to 0.1 mm. It is preferably 5 mm, particularly 0.2 to 1.5 mm, and the ratio (P2 / L3) of the pitch P2 to the length L3 is preferably 1.1 to 300, particularly 4 to 100.

  As shown in FIG. 2, the dimensions and ratios of the above-described parts are as follows. The composite stretchable member is expanded in a flat shape by stretching the elastic member (the state in which the influence of the elastic member is completely eliminated by cutting the elastic member or the like) In the state expanded to the same dimensions as when flattened with a), the measurement is performed.

  In the present embodiment, all the elastic members 4 are arranged so as to overlap with the respective heat fusion portions (joining portions) 5 constituting the joining line 50 in the expansion / contraction direction (X direction) of the elastic member 4. Each elastic member 4 passes through the central portion of each heat-sealing portion 5 in the Y direction, and is not cut at each heat-sealing portion 5, and between each sheet material 2, 3 at each heat-sealing portion 5. It is fixed to.

  In the composite stretchable member 1 of the present embodiment, the elastic member 4 contracts in its natural state (a state in which no external force is applied), so that each of the two sheet materials 2 and 3 is, as shown in FIG. , 6, 6... Are formed between the joining lines along the crossing direction (Y direction) of the elastic member 4 in the expansion / contraction direction.

  Each ridge 6 of both sheets 2 and 3 is formed so as to protrude from both surfaces of the composite elastic member 1, and the tip end portion of each ridge 6 in the protruding direction forms a convex curved surface having an arcuate cross section. . Each of the flanges 6 is continuously divided so as to extend between the plurality of elastic members 4 in the orthogonal direction (Y direction) without being divided at a portion where the elastic members 4 overlap with each other. Beautiful.

  In the composite stretchable member 1 of the present embodiment, the elastic member 4 is fixed between the sheet materials 2 and 3 at each heat-sealing portion 5 constituting the joining line 50 along the stretchable direction (X direction) of the elastic member 4. Therefore, since the shrinkage stress of the elastic member 4 is used to surely shrink both the sheet materials between the heat fusion parts, the ridges 6 formed in each part can be easily homogenized. Homogeneity is not impaired. Moreover, since the joining line 51 along the crossing direction (Y direction) of the elastic member 4 is composed of a plurality of intermittently arranged heat-sealing parts (joining parts) 5, the composite elastic member 1 is very flexible. Yes, for example, the composite elastic member 1 is flexibly deformed with respect to a force for compressing the composite elastic member 1 in the Y direction and a force for bending the composite elastic member 1 in the same direction. Therefore, for example, when used to form a gather (a stretchable part having a large number of wrinkles), particularly a three-dimensional gather (an upstanding leak-proof wall) on an absorbent article, the touch when the gather contacts the skin is soft. It is good, and the irritation that the gather gives to the skin can also be reduced.

  Further, in the composite stretchable member 1 of the present embodiment, the elastic member 4 is between the trough 6 and the scissors 6 in the one sheet material 2 and between the scissors 6 and 6 in the other sheet material 3. As a result of being sandwiched between the valleys and the tip of the ridge forming a convex curved surface, a volume is generated in the thickness direction of the sheet material and the surface of the composite elastic member 1 is touched. Feels very soft and feels very good.

The material for forming the composite elastic member 1 of this embodiment will be described.
Examples of the sheet materials 2 and 3 include nonwoven fabrics, woven fabrics, knitted fabrics, resin films, and the like produced by various manufacturing methods such as air-through nonwoven fabric, heat roll nonwoven fabric, spunlace nonwoven fabric, spunbond nonwoven fabric, and meltblown nonwoven fabric. A sheet material obtained by stacking and integrating the above can be used.
Both sheet materials or one sheet material (especially a sheet material that forms a skin-side surface when used for making a composite elastic member abut on the skin) from the viewpoint of forming a beautifully pleasing and comfortable feel. The forming material is preferably an air-through nonwoven fabric, a heat roll nonwoven fabric, a spunlace nonwoven fabric, a spunbond nonwoven fabric, a meltblown nonwoven fabric, or the like.

  The scissors 6 are generated by deforming both the sheet materials 2 and 3 by the contraction of the elastic member 4. Therefore, the rigidity of the sheet is an important factor that determines the formability and cushioning properties of the heel of the composite elastic member. Stiffness can be represented by the buckling strength of the sheet material. The buckling strength of the nonwoven fabric used in the present invention is preferably 100 cN or less, particularly preferably 70 cN or less. Here, the buckling strength can be measured by a compression test mode of a Tensilon universal testing apparatus (manufactured by Orientec) as shown below.

Buckling strength test method (CD):
Take a rectangular test piece of 150 mm in the machine flow direction (MD) and 30 mm in the direction perpendicular to the machine flow direction (CD), make a cylinder with a diameter of 45 mm, and measure the upper and lower ends of the overlapping parts with staples etc. A sample. This is measured at a measurement environment of 20 ° C., 65% RH, and measurement conditions of a compression speed of 10 mm / min and a measurement distance of 20 mm in the compression test mode of the Tensilon universal testing device. The maximum strength when the sample is compressed by 20 mm is measured for each sample, the average value is obtained, and this is taken as the buckling strength.
As described above, a non-woven cloth is preferably used as the sheet material. The basis weight of the nonwoven fabric is preferably 5 to 50 g / m ² , particularly preferably 8 to 30 g / m ² . The buckling strength of the nonwoven fabric having such a basis weight is preferably 50 cN or less, particularly preferably 30 cN or less in the CD direction, and preferably 70 cN or less, particularly preferably 50 cN or less in the MD direction. By using a soft sheet material, the moldability of the ridge can be improved.

Further, from the viewpoint of facilitating bonding by heat fusion, the sheet material is preferably made of a heat-fusible resin as a forming material (fiber in the case of a nonwoven fabric, film material of a resin film). Examples of the adhesive resin include polyethylene and polypropylene. The fiber constituting the nonwoven fabric or the like may be a core-sheath type composite fiber or the like made of a resin whose surface is only heat-fusible.
The forming material may be the same or different between one sheet material and the other sheet material of the two sheet materials.

  The two sheet materials in the present invention are not limited to two separate sheets, but one sheet material is bent to form two opposing surfaces, and a portion constituting one surface is defined as 1 One sheet material and the part constituting the other surface may be another sheet material.

  As a material for forming the elastic member 4, various known elastic materials used for absorbent articles such as disposable diapers and sanitary napkins can be used without particular limitation. Synthetic rubber such as neoprene, natural rubber, EVA, stretchable polyolefin, polyurethane, etc. Alternatively, a multifilament type thread or the like can be used.

Another factor that determines the moldability of the composite elastic member is the expansion ratio and elastic stress of the elastic member. In order to make the cross-sectional shape of the ridge convex, the required expansion ratio and elastic stress of the elastic member are required. The elastic member is preferably applied to the sheet material in a stretched state of 20 to 1000%, particularly preferably 50 to 400%. Then, the elastic member contracts, and the non-woven fabric of the contracted portion is left, and the wrinkles are formed by deforming outwardly in the direction opposite to the bonding surface of the heat-sealing group into a convex cross section.
As described above, the height of the ridge is important when considering formability and cushioning properties, and can be arbitrarily designed by selecting the joint pattern and interval, the material, and the elastic member. The height of the ridge is preferably about 1 to 15 mm on one side. In order to increase the wrinkles, the distance between adjacent joints is secured by a predetermined size, and the expansion and contraction magnification and the convex wrinkles are sufficient to close the gap, thereby creating a soft composite stretch with a sense of volume. A member can be formed. When making a piece having a height of h on one side of the ridge, at this time, it is preferable that the distance between the joints is at least 2 × h, and when the distance is the minimum value of 2 × h, the elastic members are adjacent to each other. It is preferable that the parts contract so that they are adjacent to each other.

One preferred elastic member is natural rubber (or synthetic rubber). Natural rubber (synthetic rubber) has a thickness of 0.05 to 1.5 mm, a width of 0.2 to 5 mm, and a typical cross-sectional area of 0.91 mm with a thickness of 0.35 mm depending on the cross-sectional area. A low modulus elastic member having a stress at the time of 100% elongation of a single yarn having a width of about 1 to 70 gf, preferably about 1 to 40 gf, particularly preferably about 1 to 30 gf is desired. A plurality of sex members having such stress characteristics are used for the composite stretchable member.
Another preferred elastic member is polyurethane spandex elastic fiber. A single yarn having a size of 10 to 3360 denier, particularly preferably 70 to 1120 denier is used. Denier is a unit representing the thickness of a yarn, and a yarn of 1 g at 9000 m is called 1 denier. A plurality of spandex elastic fibers that are stretched to 30 to 500% are used.
By disposing a plurality of the above-mentioned single yarns of the elastic member having a low modulus at a high elongation ratio of preferably 100% or more, particularly preferably 200% or more, a composite stretchable member having a beautiful fold that softly stretches is obtained. be able to.

The composite elastic member 1 described above can be produced efficiently and economically, for example, by the following method.
First, a plurality of elastic members 4 are arranged in an expanded state between the two sheet materials 2 and 3 (the layers are not bonded). Then, as shown in FIG. 3, the laminate 12 is partially heated and pressed by a plurality of convex portions 7, and both sheet materials 2, 3 are formed into the formation pattern of the heat-sealed portion 5 (see FIG. 2). ) Partly heat-sealed with a pattern corresponding to. During this partial heating and pressing, it is necessary not to cut the elastic member 4. Both the sheet materials are heat-sealed, and the elastic member 4 is heat-bonded to the sheet material via the heat-fusible fiber included in the sheet material, and the elastic member 4 is not cut. For example, (1) the pressing pressure of the convex portion 7 against the anvil roll 71, (2) the clearance between the convex portion 7 and the anvil roll 71, and (3) the temperature of the convex portion 7 and the anvil roll 71, It is preferable to derive the optimum conditions by changing the parameters. In addition, selecting a material that is not easily affected by pressure or heat as the material of the elastic member, that is, a material that is difficult to cut, and using the product with a low elongation rate as a product specification is also effective as a method that does not cut the elastic member. is there.

In addition, as a means for actively reducing the pressure applied to the elastic member (a means for reducing the pressing force), a measure is taken so that no pressure is applied to a portion of the plurality of convex portions 7 that intersects the elastic member. Also good. For example, the anvil roll corresponding to the convex portion may be made of rubber such as silicon rubber. If the durability of the rubber is a concern, there is a method in which the rubber is wound only on the portion overlapping the elastic member. As another example, the convex part which formed the groove part (concave part) 72 for pressing force reduction in the site | part corresponding to the elastic member 4 is used. The heat fusion using such a convex portion can be performed by, for example, a heat embossing device or an ultrasonic embossing device, and the embossing roll 70 having such a convex portion 7 on the peripheral surface is opposed to the roll. This can be done by inserting the laminate 12 between the anvil roll (receiving roll) 71.
In the embossing device shown in FIG. 3, the pressing force is reduced also on the portion corresponding to the elastic member 4 on the outer peripheral surface of the anvil roll 71 as the surface for pressing the laminate 12 with the plurality of convex portions 7. A groove portion (concave portion) 73 is formed.

  The elastic member 4 can be easily fixed to the heat-sealing portion 5 while preventing the elastic member 4 from being cut by providing the heat-welding convex portion and / or the groove portions 72 and 73 for reducing the pressing force on the opposing surface. can do. In addition, the elastic member 4 in the heat-sealed portion may be fixed so as not to be displaced between both sheets only by being sandwiched between both sheets, and the melted surface may be one or It may be fused with both sheet materials. Further, the groove for reducing the pressing force can be provided only on either the convex portion or the facing surface thereof.

After forming the heat-sealing portion 5 in this manner, the end seal portion 11 is formed in the two sheet materials in the state where the elastic member 4 is sandwiched between them in a portion separated from each other in the extending direction of the elastic member 4. Apply the integration process. For this integration process, heat embossing or ultrasonic embossing can be used. Moreover, the process which applies the adhesive agent to one or both sheet materials and / or an elastic member, and pressurizes the site | part which apply | coated the adhesive agent as another integration process may be sufficient. This integration process can be omitted when the end seal 11 is not formed.
And the predetermined location in both the sheet materials 2 and 3 of the state which pinched | interposed the elastic member 4 is cut | disconnected so that the site | part which performed the integration process may be located in the both ends of the direction where the elastic member 4 is extended. Then, the elastic member 4 is contracted to form a plurality of wrinkles on each of the sheet materials 2 and 3, whereby the composite stretchable member 1 having the above-described configuration is obtained. The above-described integration process is performed when the elastic member 4B that does not overlap with the heat-sealing part (joining part) 5 is disposed like the composite elastic member 1 '' shown in FIG. Particularly preferred for fixing.

  As mentioned above, although preferable embodiment of this invention was described, this invention is not restrict | limited to embodiment mentioned above.

  For example, the elastic members may not be arranged in the same number as the number of joining lines in the expansion / contraction direction (X direction) of the elastic members. For example, in the composite stretchable member 1 ′ shown in FIG. 4, all the elastic members 4 overlap with the respective heat-sealing portions (joint portions) 5 constituting the joint line in the stretchable direction (X direction) of the elastic member 4. However, the elastic members 4 are arranged only for every other joining line in the expansion / contraction direction (X direction).

  Further, in addition to the elastic member 4A arranged so as to overlap with the heat fusion part (joining part) as in the composite elastic member 1 ″ shown in FIG. 5, it does not overlap with the heat fusion part (joining part). You may have the elastic member 4B distribute | arranged. The elastic member 4B in the composite expansion-contraction member 1 "shown in FIG. 5 is being fixed to both the sheet | seat materials only in the edge part seal part 11 (only one is shown). However, at least two of the elastic members arranged on the composite elastic member need to be fixed at the heat fusion part, and 1/3 or more of the elastic members arranged on the composite elastic member In particular, it is preferable that more than half is fixed at the heat fusion part. The elastic members in the composite elastic member 1 ″ shown in FIG. 5 are fixed to the heat-sealed portion every other line, but may be fixed to a fixed number such as two or three. When it is necessary to form both the heat fusion part to which the elastic member is fixed and the heat fusion part to which the elastic member is not fixed like the composite elastic member 1 '' shown in the above-described manufacturing method, The groove (recess) for reducing the pressing force may be formed only on a part of the plurality of convex parts for heat fusion or on a surface facing the convex part of the part.

  In addition, although the number of the elastic members in a composite elastic member can be suitably determined according to the dimension and application of a composite elastic member, it can be 5-30, for example. Further, the joint portion between the sheet materials may be an adhesive portion in which the sheet materials are bonded together using a hot melt adhesive or the like instead of the heat fusion portion. Moreover, the formation pattern of a heat-fusion part can be changed suitably, and the shape of each heat-fusion part can also be made into appropriate shapes, such as a rectangle, an ellipse, a circle, and a rhombus.

The composite stretchable member of the present invention is particularly preferably used for forming stretchable portions of absorbent articles such as disposable diapers and sanitary napkins. In that case, after completion of the composite elastic member, it may be fixed to the absorbent article to form an elastic part, but the manufacturing process of the composite elastic member is incorporated into the manufacturing process of the absorbent article, It is also possible to produce an absorbent article in an incorporated state.
FIG. 6 shows an example of a stretchable part formed by using a composite stretchable member, taking a disposable diaper 20 having a fastening tape 21 as an example. For example, the waist stretchable part 22 and the fastening tape 21 are interlocked. Thus, the tape vicinity expansion / contraction part 23, the waistline expansion / contraction part 24, and the expansion / contraction part 25 formed on the skin contact surface of the leak-proof wall can be formed using the composite expansion / contraction member of the present invention.

It is a perspective view showing a composite elastic member as one embodiment of the present invention with a part broken away. It is a top view which shows the state which expanded the elastic member by extending the elastic member of the composite elastic member of FIG. It is sectional drawing which shows a part of embossing apparatus which can be used for manufacture of the composite elastic member of FIG. It is a figure (figure 2 equivalent figure) which shows the composite elastic member as other embodiment of this invention. It is a figure (figure 2 equivalent figure) which shows the composite elastic member as other embodiment of this invention. The example of the expansion-contraction part formed using the composite expansion-contraction member of this invention shows the case of the disposable diaper which has a fastening tape as an example.

Explanation of symbols

1, 1 ', 1 "composite stretchable member 2 sheet material 3 sheet material 4 elastic member 5 heat fusion part (joint part)
6 襞

Claims (5)

A composite elastic member comprising two sheet materials and a plurality of elastic members arranged between the two sheet materials,
Wherein between two sheet materials, the elastic members stretchable direction and in both the cross direction are intermittently bonding, bonding lines consisting of their respective plurality of joints, along the directions respectively, Each is formed in multiple,
At least two of the elastic member, the disposed so as to overlap the respective junction of the cemented line along the stretching direction, is fixed between the two sheet materials at respective junctions, each of said junction , Having portions located on both sides of the elastic member,
Each of the sheet materials forms wrinkles between the joining lines along the intersecting direction of the expansion / contraction direction, and the direction in which the joining line along the intersecting direction extends has an intersection angle of 75 with the expansion / contraction direction. And a joining line extending in the intersecting direction extends over the plurality of elastic members,
The elastic member is a composite elastic member that continuously extends in the crossing direction of the elastic direction so as to cross the plurality of elastic members.   In the joining line along the crossing direction of the expansion / contraction direction, the ratio (P1 / L1) between the length L1 of the joint and the arrangement pitch P1 of the joint is 1.05 to 80, and the arrangement of the joint The composite elastic member according to claim 1, wherein the pitch P1 is 1 to 40 mm.   The composite stretchable member according to claim 1 or 2, wherein each joint is formed by heat-sealing the two sheet materials. It consists of two sheet materials and a plurality of elastic members arranged between these two sheet materials,
The two sheet materials are intermittently joined to each other in the expansion / contraction direction of the elastic member and the intersecting direction thereof by thermal fusion, and a joining line composed of a plurality of joining portions is provided along each of the two directions. And a plurality of each is formed,
At least two of the elastic members are arranged so as to overlap each joint that constitutes a joint line along the expansion and contraction direction, and are fixed between the two sheet materials at each joint, , A method for producing a composite elastic member having portions located on both sides of the elastic member,
A plurality of elastic members are arranged in a stretched state between two sheet materials, and the laminate is partially heated and pressed by a plurality of convex portions to form the joint portion between the two sheet materials. A process of partially heat-sealing,
The partial heating pressurization is subjected to means for reducing the pressure applied to the elastic member at a position crossing the elastic member of the convex portions, method of producing a composite elastic member to perform so as not to cut the elastic member. The manufacturing method of the composite elastic member of Claim 4 whose means to reduce the pressure added to the said elastic member is a groove part for the pressing force reduction provided in the location which cross | intersects the said elastic member of the said convex part.

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