JP2006027089A - Composite stretching and contracting member and its production method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a composite stretching and contracting member which can form flexible gathers excellent in touch. <P>SOLUTION: The composite stretching and contracting member has two sheet materials 2 and 3 and at least two elastic members 4 arranged between the sheet materials 2 and 3. The sheet materials 2 and 3 and the elastic members 4 are joined intermittently to each other in the stretching and contracting direction of the elastic members 4. Between the joining parts 24 of one sheet material 2 in the stretching and contracting direction, the joining part 34 of the other sheet material 3 is formed. At least two folds 20 and 30 are formed in the direction crossing the stretching and contracting direction by the sheet materials 2 and 3. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a composite stretchable member that is soft and excellent in touch, and a method for manufacturing the same.

  In absorbent articles such as disposable diapers and sanitary napkins, an elastic member is joined to a sheet material in an expanded state, and the elastic member is contracted to form a gather on the sheet material.

As a conventional technique related to a composite stretchable member that forms such a gather, a stretchable composite sheet having a large number of wrinkles extending in the width direction is known, in which the sheet member and the elastic member alternately undulate in the longitudinal direction. (See Patent Document 1 below). In this stretchable composite sheet, a sheet member and an elastic member are sandwiched between elastic rolls of a flat roll and an embossing roll, and a ridge is formed by the contraction force of the elastic member. However, this stretchable composite sheet has insufficient flexibility because the portion sandwiched between the elastic protrusions is thin and hard.
On the other hand, as a technique relating to a three-dimensional sheet with improved flexibility, a three-dimensional sheet of Patent Document 2 below is known. This three-dimensional sheet is formed of a fiber assembly in which the cross-sectional shape is corrugated, and the density of the top or bottom of the wave is lower than the intermediate portion between the top and bottom. This three-dimensional sheet is provided with a touch and fit suitable for a leak-proof portion of an absorbent article, but a composite elastic member having a different shape and capable of forming a more flexible and soft gather is desired. It was rare.
Further, as a method of shaping a nonwoven fabric, a method of hot pressing with a nonwoven fabric sandwiched between rolls is known (see Patent Document 3 below), but it is difficult to shape into a desired shape unless it is sufficiently heated and pressed. On the other hand, there were problems such as hardening by heating.
Further, Patent Document 4 below discloses a laminated material in which a nonwoven fabric is bonded to form both sides of the stretchable film so that the adhesive regions do not align with each other in the vertical direction, thereby increasing the bulk. Since this laminated material does not have elasticity, its use is limited.

JP 2002-371456 A JP 2003-153946 A JP 2001-145667 A JP-A-6-255006

  Therefore, an object of the present invention is to provide a composite stretchable member that has stretchability and is capable of forming a gather that is flexible and soft to the touch, and a method for manufacturing the same.

  The present invention is a composite elastic member comprising two sheet materials and an elastic member disposed between the two sheet materials, and the two sheet materials and the elastic member are arranged in the elastic direction of the elastic member. Between the joint portions between the one sheet material and the elastic member in the expansion / contraction direction, a joint portion between the other sheet material and the elastic member is provided, and each sheet material is between the joint portions. The above object is achieved by providing a composite stretchable member in which a convex raised portion is formed.

  The present invention includes two sheet materials and an elastic member disposed between the two sheet materials, and the two sheet materials and the elastic member are intermittently joined in the expansion / contraction direction of the elastic member. In addition, a joint between the other sheet material and the elastic member is provided between the joints between the one sheet material and the elastic member in the expansion / contraction direction, and each sheet material has a convex ridge between the joints. Is a sandwiched body having a recess and a protrusion that are combined with each other after an elastic member is stretched between two sheets to form a laminate. An elastic member comprising a step of sandwiching the laminate from the outside of both sheet materials, and when the laminate is sandwiched between the sandwich members without substantially applying pressure on the side wall surfaces of the protrusions between the sandwich members The tension between the elastic member and the convex And preparative material, there is provided a method of producing a composite elastic member in pressure contact with the elastic member providing said junction.

The composite stretchable member of the present invention has stretchability, is soft and has a fine and regular gather that is excellent in touch, and can form such a gather on an absorbent article or the like.
According to the method for producing a composite elastic member of the present invention, it is possible to suitably produce a composite elastic member that has elasticity and has a fine and regular gather that is flexible and excellent in the touch.

Hereinafter, the present invention will be described based on preferred embodiments with reference to the drawings.
As shown in FIGS. 1 and 2, the composite elastic member 1 of the present embodiment includes two sheet materials 2 and 3, and a plurality of elastic members 4 arranged between the two sheet materials 2 and 3. It has.

  In the composite stretchable member 1, the sheet materials 2, 3 and the elastic member 4 are intermittently joined in the stretch direction (length direction: x direction in FIG. 1) of the elastic member 4, and the sheet material in the stretch direction 2 and the elastic member 4 are joined to each other between the joint portions 24, and the joint portion 34 between the sheet material 3 and the elastic member 4 is provided. The sheet material 2 is between the joint portions 24 and the sheet material 3 is the joint portion. Between 34, a convex ridge is formed. In FIG. 1, the raised portion is formed with a large number of ridges 20, 30 extending in the intersecting direction of the expansion / contraction direction (y direction in FIG. 1) with the sheet materials 2, 3. Each of the sheet materials 2 and 3 is joined to the elastic member 4 in a state where an uneven shape that is curved into a wave shape is maintained. Compared to the case where the elastic member and the joint portion of each sheet material coincide with each other, such a shape makes it possible to obtain a gather that is flexible and difficult to be crushed and has a good touch.

  The distances d24 and d34 between the joints 24 and 34 in the expansion / contraction direction are preferably 0.3 to 6 mm, particularly 1 to 3 mm from the viewpoint of forming a fine and regular gather. Similarly, the lengths L24 and L34 of the joint portions 24 and 34 in the expansion / contraction direction are preferably small for obtaining a good touch and appearance, but if the length is too small, the heel shape is difficult to be maintained. It is preferably 1 to 2 mm, particularly preferably 0.1 to 1 mm.

  The composite stretchable member 1 is preferably provided with a joint 34 of the sheet material 3 at a substantially central portion between the joints 24 of the sheet material 2 in the stretch direction, or between the joints 24 of the sheet material 2 or As long as it is between the joint portions 34 of the sheet material 3, even if it is deviated within ± 20% with respect to the distances d <b> 24 and d <b> 34 between the joint portions from the substantially central portion to the front and rear in the expansion / contraction direction within a range that does not affect the appearance. Good.

  The elastic members 4 are preferably arranged substantially in parallel from the viewpoint that an appearance similar to a pile ground such as clothing can be obtained. However, in the range where the elastic members 4 do not cross each other, the angle is 0 to 45 degrees. May be arranged. The distance d4 between the adjacent elastic members 4 is preferably 1 to 15 mm, more preferably 2 to 6 mm because a regular fine gather is formed and the smaller the distance, the easier the shape is retained. preferable.

When the composite stretchable member 1 is stretched from the natural state (state where no external force is applied) of the composite stretchable member 1, the stretch rate until the composite stretchable member 1 stops stretching (corresponding to a load of 450 cN / 25 mm width) is 1.5 to 6 times. It is preferable that it is 2 to 4 times. By using such an extension rate, a product having a high heel height h20, h30 is obtained and has a good texture, and when applied to gathers around the legs and waist, it is easy to loosen and has a wide range of movement and proper tightening. can do. Specifically, when a composite stretchable member that can be stretched up to 2.5 to 4 times is stretched 1.2 to 1.8 times, the distances d24 and d34 between the joints and the heights of the flanges 20 and 30 are increased. h20 and h30 are in an approximated state, and a good touch is obtained.
When the elongation at break of the elastic member 4 is preferably 2 to 12 times, more preferably 6 to 10 times, the elastic member is difficult to break at the time of shape processing, and the above-described preferable expansion rate can be obtained as a composite stretchable member.
The residual strain of the composite stretchable member 1 is difficult to inhibit the stretchability because the joint between the elastic member 4 and the sheet materials 2 and 3 is displaced. For this reason, the residual strain at 100% elongation at a speed of 300 mm / min is preferably 1 to 20%, and more preferably 1 to 5% from the viewpoint of obtaining a stretchable good follow-up property. Moreover, it is preferable that the difference of the residual distortion of what performed the saddle shape process and what did not perform it is 1% or more.
The strength at 100% elongation of the composite stretchable member 1 is preferably 30 to 800 cN / 25 mm width, more preferably 50 to 300 cN / 25 mm width, in that moderate tightening and fit can be obtained.

  The joint portions 24 and 34 between the sheet materials 2 and 3 and the elastic member 4 are preferably provided by bonding the sheet materials 2 and 3 and the elastic member 4 via an adhesive. And the elastic member 4 may be provided by directly joining the elastic member in a molten state. By doing so, the outer surface of the sheet material is flexible without being heated. In this case, the apportionment of the sheet material becomes the extension.

  The distances d20 and d30 between the tops of the ridges 20 and 30 are preferably set to 0.3 to 6 mm, particularly 1 to 3 mm, from the viewpoint that it becomes difficult to maintain the shape of the ridge when the texture and the interval are too wide.

The height of the ridges 20 and 30 (height from the elastic body surface to the top of the ridges 20 and 30) h20 and h30 is 0.2 to 5 mm, particularly 0.5 to 3 mm in terms of cushioning properties and softness. It is preferable. The heights h20 and h30 of the ridges 20 and 30 are obtained by averaging five adjacent values of h20 and h30 at 100 times the cross section of the elastic member of the composite stretchable member using an optical microscope. Alternatively, it is obtained by subtracting the thickness of the elastic member from the thickness at a load of 0.5 cN / cm ^{2 at a} diameter of 25 mm to ½.

  The flanges 20 and 30 are formed on both surfaces of the composite elastic member 1 so as to protrude at the above-described intervals and heights, respectively. The front ends of the flanges 20 and 30 in the protruding direction form a convex curved surface having a circular arc cross section, and each of them extends continuously so as to extend between the elastic members 4, so that it looks very beautiful.

  Since the crossing direction (y direction) of the elastic member 4 that is the direction in which the flanges 20 and 30 extend is high in elongation, the crossing angle with the elastic direction is shown in the figure. Although it is preferable that it is substantially right angle (90 degrees) like the composite elastic material 1 of a form, when considering the case where it is desired to expand-contract in a diagonal direction, it can also be 45-90 degrees.

  The above-described dimensions and the like of each part are measured in a state of being stretched 1.3 times assuming that the portion is stretched to some extent during use.

  The composite elastic member 1 of the present embodiment has a large number of fine ridges 20 and 30 formed on the surface thereof, and the joint portions 24 and 34 that are not soft to the touch are buried between the folds 20 and 30, so that it is flexible and soft to the touch. Good. For this reason, when applied to a member that comes into contact with the body, such as an absorbent article, the skin is red and hardly congested after the elastic member. Further, since the sheet members are intermittently joined at the portion where the elastic member is disposed, the flexibility is further improved.

The material which comprises the composite elastic member 1 of this embodiment is demonstrated.
As the sheet materials 2 and 3, a nonwoven fabric, a resin sheet, paper, or the like, a combination thereof, or a sheet material obtained by laminating and integrating two or more of these is used.

  When using a non-woven fabric for the sheet materials 2 and 3, as shown below, the sheet material 2 and 3 has a stiffness represented by a buckling strength measured by a compression test mode of a Tensilon universal testing device (Orientec Co., Ltd.). It is preferable.

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 sample is measured by a compression test mode of a Tensilon universal testing apparatus at a measurement environment of 20 ° C., 65% RH, and under measurement conditions of a compression speed of 10 mm / min and a measurement distance of 20 mm. 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.
The nonwoven fabric used as the sheet material preferably has a buckling strength of 1 to 40 cN, particularly 1 to 10 cN in the CD direction, and preferably 1 to 50 cN, particularly 1 to 17 cN in the MD direction. By using a soft sheet material, the flexibility of the bag can be further increased.

Examples of the nonwoven fabric include spunbond nonwoven fabric, meltblown nonwoven fabric, SMS nonwoven fabric combined with spunbond and meltblown, air-through nonwoven fabric, heat roll nonwoven fabric, spunlace nonwoven fabric, air raid, and resin bond nonwoven fabric. The thing by various manufacturing methods, such as these, is mentioned.
Both sheet materials or one sheet material (especially a sheet material that forms a skin-side surface when used for contacting a composite elastic member with the skin) from the viewpoint of forming a visually pleasing and comfortable flexible wrinkle 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 basis weight of these nonwoven fabrics requires a certain amount of basis weight and strength to prevent tearing. Conversely, if the basis weight is too high and too thick, 5 to 50 g / m ² , particularly 10 to ²⁰ g, from the viewpoint of impairing air permeability. / M ² is preferred.

  Examples of the material of the fibers constituting the nonwoven fabric include synthetic resins such as polyethylene, polypropylene, polyester, and acrylic. The fibers constituting the nonwoven fabric may be those subjected to a hydrophilic treatment or a water repellent treatment, or may be a so-called core-sheath composite fiber having a heat-fusible sheath material on the surface of the core material.

Examples of the resin sheet include those made of polyethylene, polypropylene, polyester, and polyurethane. The form may be a film or a foamed sheet. The thickness of these resin sheets is preferably 5 to 100 μm, particularly preferably 10 to 20 μm, from the viewpoints of softness and strength. The basis weight of these resin sheets, from the same viewpoint, 5 to 30 g / m ^2, especially 10 to 20 g / m ² is preferred.

Examples of the paper include tissue made of pulp and synthetic fibers. The basis weight of these papers is preferably 5 to 100 g / m ² , particularly preferably 10 to ²⁰ g / m ² from the viewpoint of absorbability and moderate strength.

  In the case where the sheet materials 2 and 3 and the elastic member 4 are bonded by thermal fusion, from the viewpoint of facilitating the bonding, the sheet material forming materials (fibers in the case of nonwoven fabrics, resin film film materials, etc.) It is preferable that the resin contains a heat-fusible resin or consists of the resin. Examples of the heat-fusible resin include polyethylene and polypropylene.

  In the two sheet materials, one sheet material and the other sheet material may be the same material or different materials.

  From the viewpoint of obtaining the above-described preferable stretch rate as a composite stretchable material, the stretch rate of the elastic member 4 is preferably 2 to 8.5 times, particularly 3 to 6 times.

  Examples of the shape of the elastic member include a film shape, a net shape, and a thread shape. In the case of a thread shape, a cross section having a rectangular shape, a square shape, a circular shape, a polygonal shape, or the like can be used, or a multifilament type or a strand shape can be used. The elastic member can be used without particular limitation with a known material conventionally used as a constituent member of the absorbent article. Examples of the material of the elastic member include synthetic rubber such as styrene-butadiene, butadiene, isoprene and neoprene, natural rubber, EVA, SIS (styrene-isoprene), SEBS (styrene-ethylene-butylene), and SEPS. (Styrene-ethylene-propylene-), stretchable polyolefin, polyurethane and the like. Particularly preferred are thread-like synthetic rubbers and natural rubbers because they have good air permeability and low elastic modulus.

  Examples of the adhesive used when the sheet members 2 and 3 and the elastic member 4 are joined include styrene (SIS, SBS, SEBS) and polyolefin hot melt adhesives. In particular, a pressure-sensitive SIS-based hot melt adhesive is preferable from the viewpoint of removal and exudation of the elastic member. Further, it is preferable to use a styrene-based hot melt at the time of gear processing, which will be described later, because it becomes a buffer material between the elastic member and the gear and prevents the elastic member from being cut. It is preferable to apply the adhesive to the elastic member 4 in advance from the viewpoint that the flexibility of the sheet member is not impaired and the alignment between the adhesive application position and the elastic member becomes unnecessary.

  When at least one of the sheet materials 2 and 3 is composed of a fiber assembly such as the nonwoven fabric, the composite stretchable member 1 has dense fibers at the joint portions 24 and 34 between the sheet materials 2 and 3 and the elastic member 4. However, since the portions of the ridges 20 and 30 formed as described above are sparse with gaps between the fibers as compared to the joint portions, the dense joint portions of the fibers are between the sparse ridges of the fibers. It becomes a dense structure buried in. For this reason, a junction part is not exposed to the surface and the touch is favorable. Moreover, since the fibers are dense only at the joint with the elastic member 4, the composite stretchable member 1 as a whole has excellent flexibility and texture.

  Next, the manufacturing method of the composite elastic member of this invention is demonstrated based on the manufacturing method of the above-mentioned composite elastic member 1 as the preferable embodiment.

  As shown in FIG. 3, first, a laminated body 10 is formed by arranging a plurality of elastic members 4 in an expanded state between two sheet materials 2 and 3.

Next, the laminated body 10 is supplied to the sandwiching body 7 including a pair of gears 5 and 6 having a plurality of concave portions 50 and 60 and convex portions 51 and 61 that are combined with each other. Since the gears 5 and 6 do not have the shape shown in FIG. 2 when pressure is applied to the composite stretchable material between the side wall surfaces 510 and 610 of the convex portion 51 and the convex portion 61, the pressure is not substantially applied. When the gear shape is a roll, it is preferable that each has a drive. It is particularly preferable to synchronize each. In the case of a flat plate shape, the projection 51 and the projection 61 are aligned so that the side wall surface does not touch. From the point of securing the space where the flanges 20 and 30 can be formed, the elastic member is cut if it is narrow, and the regular gathers are difficult to be formed if it is too wide. The gears 5 and 6 are arranged so that a minimum gap of 1.5 to 10 times the thickness of the laminate 10 (thickness of the portion where the elastic member is arranged in an extended state) is provided between It is preferable to combine the concave portion 50 and the convex portion 61 and the concave portion 60 and the convex portion 51. Particularly preferably, it is 3 to 5 times. The thickness of the laminated body 10 required when setting the arrangement of the gears 5 and 6 is determined by determining the thickness of each constituent material as follows. The thickness of the elastic body is determined by measuring the thickness of the elastic member in the same stretched state as that in the laminate 10 with a microscope. The sheet material and the adhesive can be obtained by converting from the basis weight assuming that their specific gravity is 1 g / cm ³ . The thickness of the laminate 10 is obtained by adding the thicknesses of the elastic member and the sheet material. Thereby, since pressure is not directly applied to the composite stretchable material by the gears 5 and 6, a soft texture can be obtained.

Next, the laminated body 10 is clamped from outside the both sheet materials 2 and 3 by the gears 5 and 6 of the clamping body 7. At this time, as shown in FIG. 4, the elastic members 4 are intermittently joined to the sheet members 2, 3 positioned between the elastic members 4 and the convex portions 51, 61 due to the tension developed in the elastic members 4. Thus, the joint portions 24 and 34 are provided. The tension per elastic member 4 at the time of mechanical insertion / extension is 5 to 30 cN, particularly 10 to 20 cN (in the case of a sheet-like elastic member, 11 to 66 cN / 10 mm width, particularly 22 to 44 cN / 10 mm width). Preferably). In this manner, by joining the elastic member and the sheet elastic member with the tension developed in the elastic member, strong adhesion with the sheet material can be obtained, and the wrinkles can be stably formed. In addition, since strong adhesion can be obtained even if the temperature of the sandwiched body is set to a low temperature of, for example, 50 ° C. or lower during bonding, the elastic member and the sheet material can be prevented from being cut, and the sheet by melting and solidifying the sheet material Curing of the material can be suppressed. Moreover, since an elastic member is not directly clamped with the gears 5 and 6 of the clamping body 7, the cutting | disconnection of the elastic member at the time of a joining process can be prevented.
Since the speed of the sheet material is bitten by the gear at the time of saddle machining, the speed before entering the gear is faster than the speed obtained from the gear center diameter (peripheral speed with a flat surface). It is preferably 1 to 2.0 times.

  In this way, the sheet members 2 and 3 and the elastic member 4 are joined, and the composite stretchable member 1 in which a large number of ridges 20 and 30 are formed in the crossing direction of the stretch direction is continuously and stably manufactured.

  As described above, according to the method for manufacturing a composite stretchable member of the present embodiment, the composite stretchable member 1 that exhibits the above effects can be suitably manufactured.

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

  For example, the sheet material constituting the composite stretchable member is preferably composed of two separate sheet materials, but one sheet material is folded to form two opposing surfaces and constitute one surface. It is also possible to use one sheet material for the part to be made and another sheet material for the part constituting the other surface.

  Moreover, although the convex raised part was demonstrated in the case of the collar, about the formed collar, you may further join two sheet | seat materials in the location without an elastic member, and may further form a recessed part in a collar. Moreover, about one gear, a convex part and a recessed part are provided in the horizontal direction with respect to the rotation direction, and the other gear to be combined is provided with a concave part and a convex part on the other gear, so that a large number of raised parts can be provided in the longitudinal direction and the width direction. It may be formed.

  Further, in the manufacturing method of the embodiment, the elastic member 4 is arranged in the conveying direction of the sheet materials 2 and 3 (along the flow direction) to form the laminated body 10 and the sandwiching body including the pair of gears 5 and 6. 7, the elastic member 4 and the sheet materials 2 and 3 are joined. As shown in FIG. 5, the elastic member 4 is joined to the sheet material in a state where the elastic member 4 extends in a direction crossing the flow direction. In a range in which the elastic member 4 is not substantially permanently stretched, the laminated body 10 is formed by arranging the elastic member 4 in a direction intersecting with the flow direction of the sheet materials 2 and 3 (direction orthogonal in FIG. 5). ', Each of which is provided with flat disks arranged in parallel at substantially equal intervals, and is combined with concave portions (gap between the disks) 50', 60 'and convex portions (peripheral edges of the disks) 51', 61 ' Is supplied to a sandwiching body 7 'composed of a set of disk groups 5' and 6 'having elasticity By joining the wood 4 and the sheet material 2, it is also possible to produce similar composite elastic member 1 'and the composite elastic member 1.

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.
The composite elastic member of the present invention can be seen as an underwear by using it as a surface material or exterior material inside a disposable diaper, for example, or it can be used for a leg gather part or a waist gather part of a disposable diaper. With its fine wrinkles, it can make it difficult to attach elastic members to the skin, and it can be used for three-dimensional gathers and wings to prevent sanitary napkins from leaking. By utilizing this, it is possible to provide a product with excellent fit.

  Hereinafter, the present invention will be described more specifically with reference to examples.

[Example 1]
Using the following sheet material, elastic member, and adhesive, a composite elastic member was produced as follows.

<Components>
Sheet material: air-through nonwoven fabric (basis weight 20 g / m ² ) and spunbond nonwoven fabric (basis weight 15 g / m ² )
Elastic member: thread-like synthetic rubber, 0.12mm thickness when machine inserted
Adhesive: Styrene hot melt, thickness 0.006mm (per side as rubber is a quadrangle)
Thickness of composite elastic material when machine is inserted: 0.17mm

<Production conditions>
Under the following production conditions, a composite elastic member was produced as shown in FIG.
Elastic body spacing d4: 4.5 mm
Clamping body temperature: normal temperature Elasticity of the elastic body when inserted into the clamping body: 3.5 times Stress when inserting the elastic body machine: 15 cN / piece

<Form of composite elastic member>
Joint length w24, w34: 0.8 mm
Joint interval d24, d34: 1.2 mm
Hail height h20, h30: 1.3 mm (thickness of composite elastic material: 2.9 mm)
Spacing distance d20, d30: 1.2 mm
Clamping body gap: 0.8 mm (4.7 times the thickness of the composite elastic material)
Elongation rate of composite stretchable member: 3.0 times Residual strain after elongation of 100%: 4% (6% for those that are not wrinkled)

[Example 2]
It was produced in the same manner as in Example 1 except that the following sheet material, elastic member and adhesive were used. And the performance of the obtained composite elastic member was evaluated in the same manner as in Example 1.
<Components>
Sheet material: Polyethylene moisture permeable back sheet (basis weight 20 g / m ² )
Elastic member: thread-like synthetic rubber, 0.12mm thickness when machine inserted
Adhesive: Styrene hot melt, thickness 0.006mm (per side as rubber is a quadrangle)
Thickness of composite elastic material: 0.17mm

<Production conditions>
Elastic body spacing d4: 4.5 mm
Clamping body temperature: normal temperature Elasticity of the elastic body when inserted into the clamping body: 3.5 times Stress when inserting the elastic body machine: 15 cN / piece

<Form of composite elastic member>
Joint length w24, w34: 0.8mm
Joint interval d24, d34: 1.4 mm
Hail height h20, h30: 0.4 mm (thickness of composite elastic material: 1.0 mm)
Spacing d20, d30: 1.4mm
Clamping body gap: 0.8 mm (4.7 times the thickness of the composite elastic material)
Elongation rate of composite elastic member: 2.5 times

  It has been confirmed that the composite elastic members obtained in Examples 1 and 2 can form a gather that is flexible and excellent in touch as a constituent member of the absorbent article.

It is a perspective view which fractures | ruptures and shows one Embodiment of the composite elastic member of this invention. It is sectional drawing which shows the composite elastic member of FIG. 1 in the state which extended | stretched the elastic member and was extended planarly. It is a perspective view which shows typically the manufacturing process of one Embodiment of the composite elastic member of this invention. It is a figure which shows typically the state at the time of joining of a sheet | seat material and an elastic body. It is a perspective view which shows typically the manufacturing process of other embodiment of the composite elastic member of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1, 1 'Composite elastic member 2, 3 Sheet material 20, 30 襞 24, 34 Joint part 4 Elastic member 5, 6 Gear 5', 6 'Disk group 7, 7' Holding body 10, 10 'Laminated body

Claims (11)

A composite elastic member comprising two sheet materials and an elastic member disposed between the two sheet materials,
The two sheet materials and the elastic member are intermittently joined in the expansion / contraction direction of the elastic member, and the other sheet material and the elastic member are elastic between the joint portions of the one sheet material and the elastic member in the expansion / contraction direction. A composite stretchable member in which a joint portion with a member is provided, and each sheet material is formed with a convex raised portion between the joint portions.   The composite stretchable member according to claim 1, wherein the raised portion is a ridge extending in a direction intersecting the stretchable direction of the elastic member.   The composite stretchable member according to claim 1 or 2, wherein the joint portion of the other sheet material is provided at a substantially central portion between the joint portions of the one sheet material in the stretch direction.   The composite elastic member according to any one of claims 1 to 3, wherein the sheet material and the elastic member are joined together via an adhesive.   The composite elastic member according to any one of claims 1 to 4, wherein the two sheet materials are made of a nonwoven fabric, a resin sheet, paper, or a combination thereof.   The composite elastic member according to any one of claims 1 to 5, wherein the elastic member is provided in the form of a plurality of threads, and an interval between adjacent elastic members is 1 to 15 mm.   The composite elastic member according to any one of claims 1 to 6, which has an elongation ratio of 1.5 to 6 times. Two sheet materials and an elastic member arranged between the two sheet materials, the two sheet materials and the elastic member are intermittently joined in the expansion and contraction direction of the elastic member, A joint between the other sheet material and the elastic member is provided between the joint portions of the one sheet material and the elastic member in the direction, and each sheet material has a convex raised portion between the joint portions. A method of manufacturing a composite elastic member,
A step of sandwiching the laminated body from the outside of the two sheet materials by holding the elastic member between the two sheet materials in a stretched state to form a laminated body and then sandwiching the laminated body with a sandwiching body having a concave portion and a convex portion combined with each other; And the tension between the elastic member and the convex portion by the tension developed in the elastic member when the laminated body is sandwiched between the sandwiching bodies without substantially applying pressure on the side wall surfaces of the convex portions between the sandwiching bodies. A method for producing a composite stretchable member, wherein the joint member is provided by press-contacting a positioned sheet material and the elastic member.   The manufacturing method of the composite elastic member of Claim 8 which combines the said recessed part and the said convex part so that those minimum gaps may be provided 1.5 to 10 times the thickness of the said laminated body.   The manufacturing method of the composite elastic member of Claim 8 or 9 which attaches an adhesive agent to the said elastic member or the said sheet | seat material, and joins an elastic member and a sheet | seat material via this adhesive agent. The manufacturing method of the composite expansion-contraction member in any one of Claims 8-10 in which the said clamping bodies each have a drive.