JP2021145973A - Stretchable sheet for absorptive article and absorptive article having the same, and method for manufacturing stretchable sheet for absorptive article - Google Patents

Abstract

To provide a stretchable sheet for an absorptive article having a stretch rate equivalent or more to a conventional technique and having an excellent appearance, an absorptive article having the same, and a method for manufacturing the stretchable sheet.SOLUTION: A stretchable sheet of the present invention includes a non-woven fabric 2 and a plurality of elastic fibers 3 bonded on a surface of the non-woven fabric 2, and has a stretchable property in at least one direction. The elastic fiber 3 is directly bonded to the surface of the non-woven fabric 2. In a cross-sectional view perpendicular to a longitudinal direction Y of the elastic fiber 3, an aspect ratio represented by length of long shaft A1/length of short shaft A2 is 1 or more to 1.1 or less, in which a line segment of the maximum diameter length of the elastic fiber 3 is a long shaft A1 and a line segment of the other side of a virtual rectangular which has two sides parallel with the long shaft A1 and which is circumscribed with an outer periphery of the elastic fiber 3 is a short shaft A2. Also, the present invention provides a method for manufacturing a stretchable sheet 1 for forming a bonded body 1A by bringing the elastic fiber 3 in a melted state into contact with a surface of the non-woven fabric 2 and cools the bonded body 1A by fluid.SELECTED DRAWING: Figure 3

Description

The present invention relates to an elastic sheet for an absorbent article, an absorbent article including the elastic sheet, and a method for manufacturing the elastic sheet for an absorbent article.

The applicant has proposed an elastic sheet that is suitably used for an exterior body or the like of an absorbent article such as a disposable diaper (Patent Document 1). In this stretchable sheet, a large number of elastic filaments arranged so as to extend in one direction without intersecting each other are joined between two stretchable non-woven fabrics over their entire length in a substantially non-stretched state. ..

Japanese Unexamined Patent Publication No. 2008-179128

When a stretchable sheet is used for a disposable diaper, the disposable diaper is stretched around the waist by a childcare worker or a caregiver, and the wearer is allowed to wear the disposable diaper in that state. Is desired to have a high elongation rate.

The stretchable sheet described in Patent Document 1 is excellent in stretchability, but there is room for improvement in improving the appearance of the stretchable sheet when obtaining a stretchable sheet having a higher stretch rate. ..

Therefore, an object of the present invention is to provide an elastic sheet for an absorbent article having a good appearance and a method for producing the same while maintaining an excellent elongation rate.

The present invention is a stretchable sheet comprising a non-woven fabric and a plurality of elastic fibers bonded to the surface of the non-woven fabric and having elasticity in at least one direction.
The elastic fibers are directly bonded to the surface of the non-woven fabric, and the elastic fibers are directly bonded to the surface of the non-woven fabric.
In a cross-sectional view orthogonal to the longitudinal direction of the elastic fiber, the shape of the elastic fiber is a perfect circle, or in the cross-sectional view, a line segment having a maximum crossing length of the elastic fiber is taken as a long axis. The ratio of the length of the major axis to the length of the minor axis is expressed when the line segment of the other side of the virtual ellipse having two sides parallel to the outer circumference of the elastic fiber is defined as the minor axis. Provided is an elastic sheet for an absorbent article having an aspect ratio of more than 1 and 1.1 or less.

The present invention also provides an absorbent article including the elastic sheet for the absorbent article.

Further, in the present invention, the elastic fibers in a molten state are brought into contact with the surface of the non-woven fabric to form a bonded body in which the elastic fibers are bonded to the surface of the non-woven fabric.
The present invention provides a method for producing a stretchable sheet for an absorbent article, in which the bonded body is cooled by a fluid.

According to the present invention, it is possible to provide an elastic sheet for an absorbent article having a good appearance and an absorbent article provided with the same, while maintaining an excellent elongation rate.

1 (a) and 1 (b) are perspective views schematically showing an embodiment of an elastic sheet for an absorbent article of the present invention. FIG. 2 is an enlarged view of a main part schematically showing a cross section of the stretchable sheet for absorbent articles shown in FIG. 1A along the longitudinal direction along the line AA. FIG. 3 is a perspective view schematically showing an embodiment of a manufacturing apparatus preferably used for manufacturing the elastic sheet for an absorbent article of the present invention. FIG. 4 is a side view schematically showing a state in which the manufacturing apparatus shown in FIG. 3 is viewed from the side surface.

Hereinafter, the present invention will be described based on the preferred embodiment with reference to the drawings. 1 (a) and 1 (b) show an embodiment of the elastic sheet for an absorbent article of the present invention. The figures are in the natural state (non-extended state) to which no external force is applied.

In the stretchable sheet 1 for absorbent articles shown in FIGS. 1 (a) and 1 (b) (hereinafter, this is also simply referred to as “stretchable sheet 1”), the non-woven fabric 2 and the plurality of elastic fibers 3 are formed in the thickness direction Z thereof. It is joined.

The elastic sheet 1 shown in FIGS. 1 (a) and 1 (b) has a mode in which a plurality of elastic fibers 3 are bonded between the first non-woven fabric 21 and the second non-woven fabric 22. The telescopic sheet 1 shown in the figure has a width direction X and a longitudinal direction Y orthogonal to the width direction, and has elasticity at least in the direction indicated by the longitudinal direction Y and is expandable (expandable). Hereinafter, the longitudinal direction Y is also referred to as “expansion / contraction direction Y”).

Each of the non-woven fabrics 21 and 22 is stretchable, and is stretchable in at least the same direction as the elastic fiber 3 is stretched. The non-woven fabric 2 is stretchable when (a) the constituent fibers of the non-woven fabrics 21 and 22 are stretched and (b) the fibers bonded at the intersection are not stretched even if the constituent fibers themselves are not stretched. When the three-dimensional structure formed by a plurality of fibers is structurally changed due to separation, the fibers are bonded to each other, the constituent fibers are torn, or the slack of the fibers is stretched, and the non-woven fabric as a whole is stretched. Including. It is preferable that the non-woven fabric 2 is substantially inelastic as a whole. "Inelastic" means the original length when the force is released from the state where it can be stretched and stretched 100% of the original length (it becomes 200% of the original length). It means the property that the length does not return to 175% or less of.

As described above, the elastic sheet 1 has a plurality of elastic fibers 3. As an arrangement form of the elastic fibers 3, for example, as shown in FIG. 1A, a plurality of elastic filaments and a non-woven fabric 2 arranged so as to extend in the expansion / contraction direction Y without intersecting each other and at a predetermined interval. A form in which at least one surface is directly bonded, or a form in which the non-woven fabric 2 is directly bonded to at least one surface of the fiber layer of the elastic fiber 3 spreading in a planar manner as shown in FIG. 1 (b). Can be mentioned. In any case, the elastic fiber 3 is bonded to the surface of the non-woven fabric 2 in a substantially non-stretched state in a pressure-bonded or fused manner, and is preferably bonded by fusion.

Specifically, the elastic fibers 3 shown in FIG. 1A are elastic filaments, and these fibers extend in the longitudinal direction Y so as not to intersect each other, and a plurality of elastic fibers 3 are arranged at intervals in the width direction X. ing. The distances between the adjacent elastic fibers 3 in the width direction X may be the same or different. Further, in the elastic fiber 3 shown in FIG. 1B, a plurality of elastic fibers 3 are randomly arranged to form a sheet. The elastic fibers 3 in the form shown in FIG. 1B may intersect with each other.

As shown in FIG. 1A, the elastic fiber 3 expands and contracts in the same direction as the extending direction of the elastic fiber 3 when a plurality of elastic fibers 3 are arranged in parallel with each other. The expansion / contraction direction Y of the expansion / contraction sheet and the extension direction of the elastic fiber 3 coincide with each other. Further, as shown in FIG. 1B, when a plurality of elastic fibers 3 are arranged so as to intersect with each other, the elastic fibers 3 expand and contract in any direction including the expansion and contraction direction Y of the elastic sheet. There are cases where the expansion / contraction direction Y of the expansion / contraction sheet and the extension direction of the elastic fiber 3 coincide with each other, and there are cases where they do not match.

The elastic sheet 1 has one of the features in the cross-sectional shape of the elastic fibers 3 constituting the sheet 1. FIG. 2 shows a schematic cross-sectional view of the telescopic sheet 1 in FIG. 1A along the width direction X. That is, the figure is a schematic view of a cross section of the elastic fiber 3 in the elastic sheet 1 orthogonal to the longitudinal direction Y.

As shown in FIG. 2, when the elastic fiber 3 is viewed in cross section so as to be orthogonal to the longitudinal direction (expansion direction Y) of the elastic fiber 3, the cross-sectional shape of the elastic fiber 3 may be a perfect circle. In this case, the aspect ratio described later is 1.
Instead, the aspect ratio is preferably greater than 1. The definition of the aspect ratio is that, first, when the elastic sheet 1 is viewed in cross section so as to be orthogonal to the expansion / contraction direction Y of the elastic fiber 3, the line segment of the maximum transfer length of the elastic fiber 3 is defined as the major axis A1 and the major axis A1. The line segment of the other side of the virtual rectangle S1 having two sides parallel to the above and circumscribing the outer circumference of the elastic fiber is defined as the short axis A2. That is, the short axis A2 is a line segment having a maximum crossing length in the direction orthogonal to the long axis A1. At this time, A1 / A2 represented by the ratio of the length of the major axis A1 to the length of the minor axis A2 is the aspect ratio. The aspect ratio is more preferably 1.1 or less, still more preferably 1.05 or less. The closer the aspect ratio is to 1, the more the cross-sectional shape of the elastic fiber 3 is a perfect circular shape.
When the cross-sectional shape of the elastic fiber 3 is a perfect circle or the aspect ratio of the cross-sectional shape is within the above range, the contact area between the non-woven fabric 2 and the elastic fiber 3 can be reduced. Even when the increase treatment is performed, a sheet having a good appearance and a high elongation rate can be obtained.

The method of calculating the length of the major axis A1 and the length of the minor axis A2 and the aspect ratio is as follows. Specifically, the elastic sheet 1 is cross-sectionally viewed along a direction (X direction) orthogonal to the extending direction of the elastic fiber 3. Then, in the sheet cross section, for the elastic fiber 3 extending in the expansion / contraction direction Y, the length of the major axis A1 and the length of the minor axis A2 in the cross section orthogonal to the expansion / contraction direction Y of the elastic fiber 3 are set to one. Any one point for each elastic fiber 3 of the above was measured using an electron microscope (manufactured by Nippon Denshi Co., Ltd., scanning electron microscope JCM-600, magnification 200 times. All the electron microscopes in the present specification are this). The aspect ratio (length of major axis A1 / length of minor axis A2) is calculated. This measurement and calculation is performed on five arbitrary elastic fibers 3 (elastic filaments), and the arithmetic mean value of the aspect ratio is taken as the aspect ratio in the present invention.

In the elastic sheet having the above structure, the contact area between the non-woven fabric 2 and the elastic fiber 3 can be reduced because the aspect ratio of the elastic fiber 3 in the cross-sectional shape is in the above-mentioned range. As a result, it is possible to obtain a sheet having an elongation rate equal to or higher than that of the conventional one, exhibiting strength that can withstand actual use, and having a good appearance of the sheet. In particular, in the manufacturing method described later, even when the elasticity increasing treatment is performed by the gear roll, defects such as holes in the non-woven fabric due to the elasticity increasing treatment are less likely to occur, so that the appearance and the elongation rate of the sheet are improved. It is advantageous in that it can achieve both improvement and improvement.

From the viewpoint of making the above-mentioned effect remarkable, it is preferable that the angle θ on the acute angle side formed by the virtual extension line of the long axis A1 and the surface L2 of the non-woven fabric 2 is within a predetermined range. Specifically, as shown in FIG. 2, when the elastic sheet 1 is cross-sectionally viewed so as to be orthogonal to the longitudinal direction Y of the elastic fiber 3, the virtual extension line L1 of the long axis A1 is considered. At this time, the angle θ formed by the virtual extension line L1 and the surface L2 of the non-woven fabric 2 on the acute angle side is preferably 45 degrees or less, more preferably 30 degrees or less, and further preferably 15 degrees or less. In this case, the aspect ratio described above is preferably more than 1, preferably 1.1 or less. When the virtual extension line L1 and the surface L2 of the non-woven fabric are parallel to each other, the angle θ is set to zero.

The method of calculating the acute angle side angle θ formed by the virtual extension line of the long axis A1 and the surface L2 of the non-woven fabric 2 can be performed by the following method. Specifically, the telescopic sheet 1 is cross-sectionally viewed along the X direction in the same manner as in the measuring method of the long axis A1 and the short axis A2. Then, using an electron microscope, the horizontal line of the observation field and the surface L2 of the non-woven fabric 2 are arranged in parallel with each other, and the angle θ on the acute angle side formed by the virtual extension line of the long axis A1 and the surface L2 of the non-woven fabric 2. To measure. This measurement is performed on five arbitrary elastic fibers 3 (elastic filaments), and the arithmetic mean value of the angle on the acute angle side is defined as the angle θ in the present invention. When the software attached to the electron microscope has a function of calculating an angle, the angle displayed on the screen can be read as it is to obtain the angle θ of the present invention.

From the viewpoint of having good appearance, strength and elasticity of the elastic sheet 1, it is preferable that the elastic sheet 1 is arranged so that a plurality of elastic fibers 3 extend in the elastic direction Y. Specifically, as shown in FIG. 1A, it is also preferable that the elastic fiber 3 is composed of a plurality of elastic filaments. With such a configuration, the contact area between the non-woven fabric 2 and the elastic fiber 3 can be reduced, so that problems such as holes in the non-woven fabric due to the elastic increase treatment during manufacturing are less likely to occur. It is possible to improve both the appearance of the sheet and the elongation rate at the same time.

As the non-woven fabric 2, for example, various non-woven fabrics such as spunbond non-woven fabric, thermal bond non-woven fabric, spunlace non-woven fabric, melt blown non-woven fabric and air-through non-woven fabric can be used. Of these, it is preferable to use a spunbonded non-woven fabric as the non-woven fabric 2. As a result, defects such as holes in the non-woven fabric due to the elastic increase treatment during manufacturing are less likely to occur, and the appearance and elongation rate of the sheet can be improved at the same time.

From the viewpoint of achieving both elasticity and strength of the elastic sheet, it is preferable that the non-woven fabric 2 and the elastic fiber 3 are joined by fusion. With such a configuration, both can be integrated without using a separate bonding agent for joining the non-woven fabric 2 and the elastic fiber 3, so that the case where the bonding agent is used separately is used. In comparison, there is also an advantage that the flexibility of the elastic sheet can be increased.

The degree of elongation of the elastic sheet 1 is preferably 50% or more, more preferably 100% or more, preferably 400% or less, and more preferably 200% or less in terms of elongation ratio. With such a configuration, when the stretchable sheet 1 is applied as a constituent member of the absorbent article, the stretchability can be effectively exhibited.

The elongation ratio can be measured as follows. First, for the stretchable sheet to be measured or the stretchable sheet of the product including the sheet, the stretchable sheet 1 including the non-woven fabric 2 and the elastic fiber 3 directly bonded to the non-woven fabric is stretched in the stretching direction Y and the direction X orthogonal to the stretching direction. Along the above, cut out with scissors so as to be 150 mm in the Y direction × 50 mm in the X direction, and use this as a test piece. When the product is configured to include components other than the telescopic sheet 1 to be measured, all the components other than the members constituting the stretchable sheet by hand or the like are used so that the stretchable sheet to be measured is not broken. It is peeled off to obtain an elastic sheet, and then cut out by the method and dimensions described above to obtain a test piece.
This test piece was pulled using a tensile compression tester (manufactured by Shimadzu Corporation, AG-IS) at a tensile speed of 300 mm / min so that the distance between chucks was 100 mm and the test piece was extended in the expansion / contraction direction Y. Measure the sheet length under a 3N / 50mm load. This measurement is performed 5 times, and the arithmetic mean value is taken as the sheet elongation (mm). Then, based on the obtained sheet elongation, the elongation ratio is calculated from the following formula.
[Elongation ratio (%)] = [Sheet elongation (mm)] / 100 (mm)
If a test piece with dimensions of 150 mm in the Y direction and 50 mm in the X direction cannot be taken out, cut out the test piece so that the dimensions are as close as possible to the dimensions, increase the distance between the chucks as much as possible, and then 3 (N). ) / 50 (mm) × [width of the collected test piece in the X direction (mm)] The sheet length under load is measured, and the sheet elongation is calculated.
Explaining a specific example based on the above calculation method, for example, when a 10 cm test piece is attached to a chuck and a tensile test is performed according to the above procedure, when the test piece is stretched to 20 cm, the elongation ratio is 100%. Is calculated.

The basis weight of the non-woven fabric 2 is preferably 10 g / m ² or more, more preferably 12 g / m ² or more, further preferably 15 g / m ² or more, preferably 100 g / m ² or less, and more preferably 50 g / m ^2. Below, it is more preferably 30 g / m ^{2 or less.} The non-woven fabric may be used alone, and in addition to this, a non-woven fabric, a woven fabric, a fiber sheet such as paper, a synthetic resin film, or the like can be laminated and used. When the first non-woven fabric 21 and the second non-woven fabric 22 are used, it is preferable that the above-mentioned basis weights are satisfied independently.

The basis weight of the non-woven fabric is measured by the following method. First, for the stretchable sheet to be measured or the stretchable sheet of the product provided with the sheet, the area including the non-woven fabric 2 and the elastic fiber 3 directly bonded to the non-woven fabric in the natural state of the stretchable sheet is shown below. Cut out with scissors and make a test piece. When the product is configured to include components other than the stretchable sheet to be measured, all the components other than the stretchable sheet to be measured are peeled off by hand or the like so that the stretchable sheet to be measured is not broken. Then, an elastic sheet is obtained and used as a test piece.
Next, the elastic fibers in the test piece are sufficiently dissolved and removed using an organic solvent, the mass (g) of the non-woven fabric remaining undissolved is measured, and the basis weight of the non-woven fabric is calculated from the following formula. As shown in FIGS. 1 (a) and 1 (b), when the stretchable sheet 1 to be measured is in a mode in which a plurality of elastic fibers 3 are directly bonded between two non-woven fabrics 21 and 22, the basis weight of the non-woven fabric is Shall be measured independently for each of the first non-woven fabric 21 and the second non-woven fabric 22.
[Non-woven fabric basis weight (g / m ² )] = [Non-woven fabric mass (g)] / (Natural state test piece length (m) when cut out x Natural state test piece width (m) when cut out)
This measurement is performed on five test pieces, and the arithmetic mean value thereof is defined as the nonwoven fabric basis weight (g / m ² ). At this time, it is preferable that the test piece is cut out with a dimension of 100 mm in length × 100 mm in width per one telescopic sheet, and the basis weight is measured using five telescopic sheets. However, if the dimension cannot be cut out, it is preferable. , The length or width is appropriately increased or decreased, or a plurality of samples are cut out from the same elastic sheet, so that the total area is adjusted to ^{0.01 m 2 per test piece.} ..

The fibers constituting the non-woven fabric 2 include substantially inelastic fibers, and it is preferable that the non-woven fabric 2 as a whole is substantially inelastic. As the constituent fibers of the non-woven fabric 2, various thermoplastic resins can be used as raw materials for the inelastic fibers, for example, polyolefin resins such as polyethylene and polypropylene, polyester resins such as polyethylene terephthalate and polybutylene terephthalate, nylon and the like. Consists of polyamide resin, vinyl resin such as polystyrene and polyvinyl chloride, acrylonitrile resin such as acrylic, methacrylic resin, vinylidene resin, natural fiber cotton, pulp, biodegradable plastic such as polylactic acid, etc. Can be done. Further, it has a fiber composed by mixing two or more kinds of these resins, or a composite fiber (core-sheath type fiber, side-by-side type fiber, eccentric crimp) in which two or more kinds of these resins are combined. Core-sheath type fiber, split fiber) can also be used. Further, it is also possible to use a fiber to which at least one of additives such as a fiber colorant, an antistatic property agent, a lubricant, and a hydrophilic agent is added to the fiber.

The elastic fiber 3 is made of an elastic resin such as a thermoplastic elastomer, synthetic rubber, or natural rubber. From the viewpoint of manufacturing efficiency of the elastic sheet, it is preferable to use a thermoplastic elastomer as a raw material for the elastic fiber 3. Examples of such elastomers include styrenes such as SBS (styrene-butadiene-styrene), SIS (styrene-isoprene-styrene), SEBS (styrene-ethylene-butadiene-styrene), and SEPS (styrene-ethylene-propylene-styrene). Examples thereof include based elastomers, olefin-based elastomers (ethylene-based α-olefin elastomers, propylene-based elastomers obtained by copolymerizing ethylene, butene, octene, etc.), polyester-based elastomers, and polyurethane-based elastomers. These can be used alone or in combination of two or more. Further, a core-sheath type or side-by-side type composite fiber made of these resins can also be used. In particular, it is more preferable to use a styrene-based elastomer, an olefin-based elastomer, or a combination thereof in terms of moldability, stretchability, and cost of the elastic filament.

From the viewpoint of combining the elasticity, appearance, and strength of the elastic sheet, the fiber diameter D1 of the elastic fiber 3 when the elastic fiber 3 is an elastic filament shown in FIG. 1 (a) is 10 μm or more. It is preferably 20 μm or more, more preferably 300 μm or less, and even more preferably 160 μm or less. The fiber diameter of the elastic fiber 3 is the long axis length and the short length of the elastic fiber 3 using a microscope in the same manner as the above-described method for measuring the aspect ratio of the cross section of the elastic sheet 1 orthogonal to the longitudinal direction. Each of the shaft lengths is measured, and these arithmetic average values are used as the fiber diameter. This measurement is performed on any five elastic fibers 3, and the arithmetic mean value of these fiber diameters is defined as the fiber diameter D1 of the elastic fibers 3 of the present invention.

In the cross-sectional view shown in FIG. 2, it is assumed that the length of the major axis A1 of the elastic fiber 3 when the elastic fiber 3 is the elastic filament shown in FIG. 1 (a) is equal to or larger than the fiber diameter D1 of the elastic fiber 3. It is preferably 10 μm or more, more preferably 20 μm or more, preferably 300 μm or less, still more preferably 160 μm or less.
Further, the length of the minor axis A2 when the elastic fiber 3 is used as an elastic filament is preferably 10 μm or more, more preferably 20 μm or more, and preferably 300 μm on the premise that the fiber diameter D1 or less of the elastic fiber 3 is used. Below, it is more preferably 160 μm or less.

From the same viewpoint, when the elastic fiber 3 is a sheet-shaped elastic fiber layer shown in FIG. 1 (b), the fiber diameter D2 of the elastic fiber 3 is preferably 0.5 μm or more, and is preferably 1 μm or more. Is more preferable, and it is preferably 30 μm or less, and more preferably 15 μm or less. The fiber diameter D2 can be measured in the same manner as the above-described method for measuring the fiber diameter D1.

In the cross-sectional view shown in FIG. 2, the length of the major axis A1 of the elastic fiber 3 when the elastic fiber 3 is the sheet-shaped elastic fiber layer shown in FIG. 1 (b) is the fiber diameter D2 or more of the elastic fiber 3. On the premise that there is, it is preferably 0.5 μm or more, more preferably 1 μm or more, preferably 30 μm or less, still more preferably 15 μm or less.
Further, the length of the minor axis A2 when the elastic fiber 3 is made into a sheet-shaped elastic fiber layer is preferably 0.5 μm or more, more preferably 1 μm or more, assuming that the fiber diameter D2 or less of the elastic fiber 3 is formed. It is preferably 30 μm or less, and more preferably 15 μm or less. The fiber diameter of the elastic fiber 3 in the present embodiment is the major axis length and the minor axis of the elastic fiber 3 using a microscope for a cross section orthogonal to the longitudinal direction of the elastic fiber 3, as in the above-described measurement method for aspect ratio. The length and the length are measured respectively, and these arithmetic average values are used as the fiber diameter.

Elastic fibers 3, a basis weight when it was elastic filaments shown in FIG. 1 (a), is preferably 5 g / ^{m 2} or more, more preferably 6 g / ^{m 2} or more and, 40 g / ^{m 2} It is preferably less than or equal to, more preferably 20 g / m ² or less.

The basis weight of the elastic fiber 3 is measured by the following method. First, for the stretchable sheet to be measured or the stretchable sheet of the product provided with the sheet, the area including the non-woven fabric 2 and the elastic fiber 3 directly bonded to the non-woven fabric in the natural state of the stretchable sheet is shown below. Cut out with scissors and make a test piece. When the product is configured to include components other than the stretchable sheet to be measured, all the components other than the stretchable sheet to be measured are peeled off by hand or the like so that the stretchable sheet to be measured is not broken. Then, an elastic sheet is obtained and used as a test piece.
Next, after measuring the mass (g) of the test piece, the elastic fibers in the test piece are sufficiently dissolved and removed using an organic solvent, and the mass (g) of the non-woven fabric remaining undissolved is measured. Then, the basis weight of the elastic fiber is calculated from the following formula. As shown in FIGS. 1 (a) and 1 (b), when the stretchable sheet 1 to be measured has a mode in which a plurality of elastic fibers 3 are directly bonded between two non-woven fabrics 21 and 22, the mass of the non-woven fabric is , The total mass of both non-woven fabrics 21 and 22.
[Elastic fiber basis weight (g / m ² )] = ([Test piece mass (g)]-[Nonwoven fabric mass (g)]) / (Test piece length (m) in the natural state when cut out x when cut out Natural state test piece width (m))
This measurement is performed on five test pieces, and the arithmetic mean value is defined as the basis weight (g / m ² ) of the elastic fiber. At this time, it is preferable that the test piece is cut out with a dimension of 100 mm in length × 100 mm in width per one telescopic sheet, and the basis weight is measured using five telescopic sheets. However, if the dimension cannot be cut out, it is preferable. , The length or width is appropriately increased or decreased, or a plurality of samples are cut out from the same elastic sheet, and the total area is adjusted to ^{0.01 m 2 per test piece.}

^{The elastic fiber 3 preferably has a basis weight of 5 g / m 2} or more, more preferably 8 g / m ² or more, and more preferably 8 g / m 2 or more when the elastic fiber 3 is used as the sheet-shaped elastic fiber layer shown in FIG. 1 (b). It is preferably 40 g / m ² or less, and more preferably 20 g / m ² or less.

The stretchable sheet 1 described above may be used as it is, or the stretchable sheet 1 may be used as a constituent member of the absorbent article. Typically, the absorbent article comprises a front surface sheet, a back surface sheet, an absorber disposed between the front surface sheet and the back surface sheet, and in addition, an elastic sheet at a predetermined portion. It can be used in a state where 1 is arranged. Absorbent articles include, for example, disposable diapers, incontinence pads, sanitary napkins, panty liners, etc., but are not limited thereto, and articles used for absorbing liquid discharged from the human body are widely used. Include. The elastic sheet of the present invention is preferably used as a constituent material for absorbent articles such as sanitary napkins and disposable diapers, and is particularly preferably used as an exterior body of pants-type disposable diapers.

The above is the description of the telescopic sheet of the present invention. Hereinafter, a suitable manufacturing method of the stretchable sheet of the present invention will be described with reference to FIGS. 3 and 4. The telescopic sheet 1 can be manufactured by using, for example, the manufacturing apparatus 100 shown in FIGS. 3 and 4. In the following description, the method of manufacturing the telescopic sheet 1 of the embodiment shown in FIG. 1A will be described as an example. Further, in the manufacturing apparatus and manufacturing method described below, it is preferable that the conveying direction MD of the nonwoven fabric 2 and the bonded body 1A and the stretching direction Y of the stretchable sheet 1 to be manufactured are in agreement with each other.

The manufacturing apparatus 100 shown in FIGS. 3 and 4 has a first non-woven fabric roll 110 for feeding the first non-woven fabric 21 in the transport direction MD and a second non-woven fabric roll 120 for feeding the second non-woven fabric 22 in the transport direction MD. Be prepared. As shown in the figure, the non-woven fabrics 21 and 22 are fed out in opposite directions.

The manufacturing apparatus 100 includes a nip roll 50 and a chill roll 60 whose peripheral surface is cooled by being arranged on the downstream side of the transport direction MD of the first raw roll 110 and the second raw roll 120 so as to face the nip roll 50. It has. In the form shown in FIGS. 3 and 4, the nip roll 50 can convey the second non-woven fabric 22 along the peripheral surface of the nip roll 50. The chill roll 60 can convey the first non-woven fabric 21 along the peripheral surface of the chill roll 60. Further, the nip roll 50 and the chill roll 60 are arranged so that the shortest distance between the peripheral surface of the nip roll 50 and the peripheral surface of the chill roll 60 has a predetermined distance, and the elastic fibers 3 in the molten state are each of the non-woven fabrics 21 and 22. It is possible to contact the surface of the. The portion where the distance between the peripheral surface of the nip roll 50 and the peripheral surface of the chill roll 60 is the shortest is the merging position C where the non-woven fabrics 21 and 22 and the elastic fiber 3 merge (see FIG. 4).

The manufacturing apparatus 100 includes a spinning apparatus 130 for spinning elastic fibers 3. The spinning device 130 is provided with a plurality of nozzles (not shown) for discharging the raw material resin of the elastic fiber 3 in a molten state below the spinning device 130, so that the elastic fiber 3 in the molten state can be discharged downward in the vertical direction. There is. The elastic fibers 3 discharged from the spinning device 130 can be made into elastic filaments arranged so that the fibers do not intersect each other and extend in one direction by appropriately changing the discharge speed and the nozzle diameter of the raw material resin. The shape of the nozzle at the discharge port of the spinning device 130 is preferably a perfect circle from the viewpoint of keeping the aspect ratio of the elastic fibers 3 in the produced elastic sheet 1 within the above range.

Further, the manufacturing apparatus 100 preferably includes a cooling apparatus 70. The cooling device 70 cools the elastic fibers 3 in the molten state or the softened state by bringing the fluid into contact with the bonded body 1A formed by the elastic fibers 3 in the molten state in contact with the surfaces of the non-woven fabrics 21 and 22. It is for cooling and solidifying. The cooling device 70 is capable of discharging a fluid. As the fluid, at least one of a liquid and a gas can be used, and it is preferable to use a gas as the fluid from the viewpoint that it can be produced without requiring an additional step such as drying.

In the embodiment shown in FIGS. 3 and 4, the cooling device 70 is in the form of an air nozzle that discharges a gas as a fluid. The air nozzle is arranged so that the tip portion thereof and the peripheral surface of the chill roll 60 face each other, so that gas can be blown to the bonded body 1A being conveyed. When a gas is used, the temperature of the gas can be preferably 5 ° C. or higher and 40 ° C. or lower. Further, air can be used as the type of gas.

The manufacturing apparatus 100 preferably includes a stretching apparatus 140. The stretching device 140 is for stretching the bonded body 1A to increase its elasticity. Specifically, the stretching device 140 includes a pair of gear rolls 40, 40 having a plurality of tooth grooves regularly arranged along the circumferential direction, and the teeth formed on one gear roll 40 are the other gear roll. It is arranged in a state of being meshed so as to fit between the teeth of. In this state, the joint body 1A is introduced between the gear rolls 40 and 40 so that the joint body 1A can be stretched along the rotation direction of the gear roll 40, that is, the transport direction MD. Both of these gear rolls 40 may be rotated by a drive source (not shown), or only one gear roll may be rotated by a drive source.

It is preferable that the manufacturing apparatus 100 further includes a second nip roll (not shown) in addition to the nip roll 50. When the second nip roll is provided, the second nip roll is arranged so as to face the chill roll 60. Further, it is preferable that the second nip roll is arranged between the cooling device 70 and the stretching device 140 when viewed along the transport direction MD. As a result, in the elastic increasing treatment, tension can be easily applied to the bonded body 1A, and the stretching efficiency can be further improved.

Hereinafter, a method of manufacturing the telescopic sheet 1 using the manufacturing apparatus 100 shown in FIGS. 3 and 4 will be described. First, a bonded body of the non-woven fabric 2 and the elastic fiber 3 in a molten state is manufactured (bonding step). In this step, the first and second nonwoven fabrics 21 and 22, respectively, are fed out from the first raw fabric roll 110 and the second raw fabric roll 120 in the transport direction MD at the same speed and merged. At the same time, at the merging position C of both non-woven fabrics 21 and 22, they are merged with a plurality of elastic fibers 3 in a molten state discharged downward in the vertical direction from the spinning device 130. At this time, when the elastic fiber 3 is in the form of an elastic filament, the spun molten elastic fiber 3 is discharged downward in the vertical direction, so that the elastic fiber 3 extends in at least one direction. Is placed in.

At the same time, the non-woven fabrics 21 and 22 and the elastic fibers 3 in the molten state are introduced between the nip roll 50 and the chill roll 60, and the elastic fibers 3 in the molten state are in contact with the surfaces of the non-woven fabrics 21 and 22 while being in contact with each other. It is held between both non-woven fabrics 21 and 22. As a result, the bonded body 1A in which the elastic fibers 3 are directly bonded to the surface of the non-woven fabric 2 is formed. The bonded body 1A has a structure in which elastic fibers 3 are interposed between both non-woven fabrics 21 and 22.

The distance between the peripheral surface of the nip roll 50 and the peripheral surface of the chill roll 60 is preferably set so low that the elastic fibers 3 can be bonded to the surface of the non-woven fabric 2. Specifically, the shortest distance between the peripheral surfaces of the rolls 50 and 60 is preferably 0.2 mm or more, more preferably 0.6 mm or more, preferably 2 mm or less, still more preferably 1.3 mm or less. With such a configuration, it is possible to maintain the cross-sectional shape of the spun elastic fiber 3 and cool it while maintaining the state in which the non-woven fabrics 21 and 22 and the elastic fiber 3 are bonded to each other. Elastic fibers 3 having the above-mentioned aspect ratio can be easily obtained. Further, even when the obtained bonded body 1A is subjected to the elasticity increasing treatment described later, it is possible to manufacture the stretchable sheet 1 having a high elongation ratio while reducing appearance defects such as holes in the non-woven fabric.

Next, the obtained bonded body 1A is cooled by a fluid (cooling step). In this step, the elastic fiber in the molten state or the softened state is brought into contact with the bonded body 1A conveyed to the downstream side of the merging position C by bringing the fluid discharged from the cooling device 70 into contact with the bonded body 1A to cool the bonded body 1A. 3 is cooled and solidified. The elastic fibers 3 in the molten state or the softened state are joined to the constituent fibers of both non-woven fabrics 21 and 22 while being cooled in the transport process of the bonded body 1A. By this step, the elastic fibers 3 in the molten state can be cooled at an early stage after coming into contact with the surfaces of the non-woven fabrics 21 and 22, so that the cross-sectional shape of the elastic fibers 3 at the time of being discharged from the spinning device 130 is maintained. It can be cooled and solidified at an early stage in the state. As a result, the elastic fibers 3 arranged in the bonded body 1A obtained after cooling can be easily controlled so that the aspect ratio thereof is within the above range. Through such a step, a continuous sheet-like bonded body 1A in which the non-woven fabrics 21 and 22 and the elastic fibers 3 are bonded by fusion is obtained.

In the cooling step, it is preferable to cool the bonded body 1A within a predetermined time after the non-woven fabrics 21 and 22 are brought into contact with the elastic fibers 3 in the molten state. Specifically, it is preferably within 0.15 seconds, more preferably within 0.1 seconds, starting from the confluence position C, which is a portion where the non-woven fabrics 21 and 22 and the elastic fiber 3 in the molten state are brought into contact with each other. The bonded body 1A is cooled. By cooling in such a time, the bonded body 1A provided with the elastic fibers 3 having the aspect ratio in the above range can be efficiently obtained. Further, when the elastic joining body 1A is subjected to the elastic increasing treatment described later, it is possible to obtain a highly elastic elastic sheet with high productivity while preventing appearance defects such as holes in the non-woven fabric generated by the elastic increasing treatment. be able to.

For the time to start the cooling step, for example, at least one of the transport speed of the bonded body 1A, the cross-sectional diameter of the chill roll 60, the arrangement position of the cooling device 70, the speed of the fluid discharged from the cooling device 70, and the like are appropriately adjusted. Can be controlled by Specific examples of these conditions will be described in detail in Examples described later, but the conditions are not limited to those shown in Examples as long as the time for starting the cooling step is within the above range.

After the cooling step, if necessary, a pressing process by a second nip roll may be performed. In this case, the pressure generated between the second nip roll and the chill roll 60 is preferably 0.5 N / cm or more, more preferably 1 N / cm or more, preferably 50 N / cm or less, still more preferably 50 N / cm or less as the linear pressure. It is 30 N / cm or less. Such pressure can be changed by appropriately adjusting the distance between the second nip roll and the chill roll 60.

From the viewpoint of further increasing the elasticity, it is preferable to perform an elastic increase treatment for stretching the bonded body 1A cooled through the cooling device 70. The elasticity increasing treatment is performed by passing the joint body 1A through the meshing portions of the pair of gear rolls 40, 40 in the stretching device 140, and stretching the joint body 1A along the transport direction MD. In this step, it is preferable that tension is applied to the bonded body 1A from the viewpoint of increasing the efficiency of the elasticity increasing treatment.

Generally, when the elasticity increasing treatment for stretching is performed using the gear roll 40 described above, when the sheet is strongly stretched for the purpose of increasing the elongation ratio of the obtained sheet, an external force is applied to the contact portion between the non-woven fabric 2 and the elastic fiber 3. It becomes easy to join, and the non-woven fabric 2 located at the contact site and its vicinity is easily torn. As a result, the resulting elastic sheet 1 may have an impaired appearance.
In this regard, according to the present invention, in the bonded body 1A after cooling, the aspect ratio of the elastic fibers 3 is in the above range, so that the contact area between the non-woven fabric 2 and the elastic fibers 3 is small. When such a bonded body 1A is strongly stretched, the contact portion between the nonwoven fabric 2 and the elastic fiber 3 is small, so that it becomes difficult for an external force to be applied to the contact portion. As a result, the stretchable sheet 1 having a good appearance can be obtained. Further, since the elasticity increasing treatment can be performed by applying a high stretching force without impairing the appearance, it is possible to manufacture the stretchable sheet 1 having a higher stretch ratio of the stretchable sheet 1. From the viewpoint of efficiently forming the stretchable sheet 1 having a good appearance and a high elongation ratio, it is preferable to use a spunbonded non-woven fabric as the non-woven fabrics 21 and 22.

The degree of stretching of the joint body 1A can be appropriately adjusted according to the tooth length of the gear roll 40. Specifically, when the tooth height is increased in both gear rolls 40 and 40, in the region where the tall teeth mesh with each other, the strong stretching force generated by the tall teeth causes the joint to not contact the teeth. The part of the body 1A is greatly stretched. As a result, high elasticity is imparted to the portion of the bonded body 1A. Further, when the tooth heights are lowered in both gear rolls 40 and 40, the generated stretching force becomes weaker in the region where the teeth having a shorter tooth height mesh with each other than in the region where the teeth having a higher tooth height mesh with each other. As a result, the degree of stretching of the portion of the joint 1A that is not in contact with the tooth having a short tooth height is reduced. As a result, low elasticity is imparted to the portion of the bonded body 1A.

When the bonded body 1A is stretched, the elastic fibers 3 expand and contract according to the elastic force of the joint body 1A. Specifically, the elastic fiber 3 is stretched by the stretching force generated by the meshing of the gear roll 40, and contracts when the meshing is released. Therefore, after the elastic fiber 3 is stretched, the elastic fiber 3 returns to a substantially non-stretched state as before the bonded body is stretched, and its aspect ratio does not change substantially. On the other hand, since the constituent fibers of the non-woven fabric 2 of the bonded body 1A are inelastic or lower elastic than the elastic fibers 3, the constituent fibers are stretched so as to have a small diameter by the meshing of the gear rolls. The constituent fibers are plastically deformed, the constituent fibers are broken, and the bond between the constituent fibers and the elastic fiber 3 is weakened (hereinafter, this state is referred to as "plastic deformation or the like"). The constituent fibers of the non-woven fabric that have undergone plastic deformation or the like protrude outward of the non-woven fabric 2 as the elastic fibers 3 shrink after the joint is stretched. In the region where the constituent fibers of the nonwoven fabric 2 are plastically deformed, the fiber diameter of the constituent fibers of the nonwoven fabric 2 in the region is smaller than that of the constituent fibers of the nonwoven fabric 2 in the region where the constituent fibers of the nonwoven fabric 2 are not plastically deformed, and the non-woven fabric 2 is non-elongated. In the state, the density of the non-woven fabric in the region undergoing plastic deformation or the like is low.

Further, the bonded body 1A in the region of the gear roll 40 in contact with the teeth is not stretched because no stretching force is applied, and the constituent fibers of the non-woven fabric 2 are not plastically deformed or the like. That is, the region is substantially the same as the bonded body 1A before stretching. In this way, in the bonded body 1A, regions that are plastically deformed and regions that are not plastically deformed and the like are alternately formed along the expansion and contraction direction Y.

When the elastic fiber 3 is in the form of an elastic filament, the draw rate of the elastic fiber 3 from the spinning device 130 is preferably a draw ratio thereof with respect to the discharge rate of the resin in the spinning device from the viewpoint of further improving the elasticity. It is preferable that the adjustment is made so as to be 1.1 times or more, more preferably 4 times or more, preferably 400 times or less, still more preferably 100 times or less.

When forming a sheet-shaped elastic fiber layer as the elastic fiber 3, for example, the melt blown method can be used. Specifically, the molten resin is extruded from a nozzle, and the extruded molten resin is stretched by hot air and sandwiched between non-woven fabrics in a molten state to form a sheet-like elastic fiber layer in which constituent fibers are randomly arranged. Can be formed. The fiber diameter of the elastic fiber 3 in the sheet-shaped elastic fiber layer can be adjusted by adjusting the melting temperature and discharge rate of the raw material resin in the spinning device 130, the nozzle diameter, the blowing speed of hot air, and the like.

Through the above steps, the suitable telescopic sheet 1 of the present invention is manufactured. If necessary, the telescopic sheet 1 is molded to have a desired size or incorporated into a constituent member of an absorbent article in a subsequent step.

The elastic sheet of the present invention and the method for producing the same are not limited to the above-described embodiment. The elastic sheet of the present invention has been described as using two non-woven fabrics in which elastic fibers are arranged and bonded between the non-woven fabrics, but the present invention is not limited to this form. For example, one non-woven fabric in which elastic fibers are bonded to one surface of the non-woven fabric can be used as an elastic sheet.

Further, the teeth arranged on at least one of the pair of gear rolls 40, 40 in the manufacturing apparatus 100 may be formed by tooth lengths having a single length, or may be formed by tooth lengths having different lengths. You may be. This makes it possible to manufacture a stretchable sheet 1 having a different stretchable ratio on one stretchable sheet 1.

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

[Example 1]
Using the manufacturing apparatus 100 shown in FIGS. 3 and 4, the telescopic sheet 1 having the structure shown in FIG. 1 (a) was manufactured. First, elastic filaments are arranged as a plurality of elastic fibers 3 between the first nonwoven fabric 21 and the second nonwoven fabric 22, and the elastic fibers 3 are melted and fused to the surfaces of the respective nonwoven fabrics 21 and 22. The directly joined body 1A was used. The elastic filament was manufactured so that the nozzle diameter of the spinning nozzle was set to 450 μm, the draw ratio was 11 times, and the filament diameter was 120 μm.
As the first and second non-woven fabrics 21 and 22 ^{, spunbonded non-woven fabrics having a basis weight of 18 g / m 2} made of polypropylene fibers having an average fiber diameter of 16 μm are used, and the elastic fibers 3 are SEPS resin (weight average molecular weight 50,000). g / mol, MFR 60 g / 10 minutes (230 ° C., 2.16 kg) was used.

In the first embodiment, in the side view of the manufacturing apparatus 100 shown in FIG. 4, the distance (shortest distance) between the peripheral surface of the nip roll 50 and the peripheral surface of the chill roll 60 is 0.6 mm, the cross-sectional diameter of the chill roll 60 is 310 mm, and cooling is performed. The cooling device 70 was arranged so that the starting position was 200 mm away from the merging position C in the circumferential direction of the chill roll 60 and on the downstream side of the MD in the transport direction, and the transport speed of the bonded body 1A was set to 150 m / min. Under the above conditions, the bonded body 1A can be cooled in 0.08 seconds from the confluence position C where the non-woven fabrics 21 and 22 and the elastic fibers 3 are in contact with each other. The cooling device 70 is an air nozzle capable of blowing a gas, the temperature of the gas is 16 ° C., and the type of the gas is air.
Then, the joint body 1A was passed through the meshing portions of the pair of gear rolls 40, and the elasticity was increased so that the elongation ratio was 150%, to obtain the desired elastic sheet 1. As the pair of gear rolls 40, teeth having a tooth length of 5 mm were regularly arranged in the circumferential direction.

[Example 2]
The cooling device 70 is arranged so that the cooling start position is 120 mm away from the merging position C in the circumferential direction of the chill roll 60 and on the downstream side of the MD in the transport direction. The elastic sheet 1 having the structure shown in FIG. 1A was manufactured in the same manner as in Example 1 except that the bonded body 1A could be cooled in 0.05 seconds from the position C.

[Comparative Example 1]
In this comparative example, in the manufacturing apparatus 100 shown in FIGS. 3 and 4, the telescopic sheet 1 was manufactured in the same manner as in the first embodiment except that the cooling device 70 was not arranged and the second nip roll was arranged. That is, in this comparative example, the cooling step is not performed. The linear pressure between the second nip roll and the chill roll 60 was 1.9 N / cm.

[Comparative Example 2]
In this comparative example, the telescopic sheet 1 was manufactured in the same manner as in Example 1 except that the cooling device 70 was not arranged in the manufacturing apparatus 100 shown in FIGS. 3 and 4. That is, in this comparative example, the cooling step is not performed. This comparative example corresponds to an example of Patent Document 1 (Japanese Unexamined Patent Publication No. 2008-179128).

[Comparative Example 3]
In this comparative example, in the manufacturing apparatus 100 shown in FIGS. 3 and 4, the cooling apparatus 70 is located so that the cooling start position is 450 mm away from the confluence position C in the circumferential direction of the chill roll 60 and downstream of the MD in the transport direction. Was arranged so that the bonded body 1A could be cooled in 0.18 seconds from the confluence position C where each of the non-woven fabrics 21 and 22 and the elastic fiber 3 came into contact with each other. Except for this, the telescopic sheet 1 was manufactured in the same manner as in Example 1.

[Aspect ratio of elastic fiber 3]
With respect to the elastic sheet 1 of Examples and Comparative Examples, the aspect ratio of the elastic fiber 3 (elastic filament) when viewed in cross section was measured and calculated by the above method. The results are shown in Table 1.

[Evaluation of sheet appearance]
The appearance of the stretchable sheet 1 of Examples and Comparative Examples was evaluated by the following method.
First, the stretchable sheets 1 of Examples and Comparative Examples were cut out in a natural state so that the length in the stretch direction Y was 150 mm and the length in the width direction X was 200 mm, respectively, to obtain test pieces. Two linear marks were attached to the test piece so as to extend in the width direction X at a distance of 100 mm in the expansion and contraction direction of the test piece in a natural state. Next, the test piece was extended until the distance between the marks became 250 mm, and in that state, image data of the sheet plane was acquired. After binarizing the obtained image data using image processing software (Image-Pro), a percentage (hole area) of ^{the total area R2 (mm 2) of the area where the sheet has holes with respect to the reference area R1.} Rate;%) was calculated.
The reference area R1 was defined as the area of the region defined by the two linear marks when the test piece was extended and the edges of both ends in the width direction X when the test piece was extended.
The total area R2 of the area where the hole is formed ^{is the total value of the area of the area having an area of 0.0314 mm 2} or more (the area of a circle having a radius of 0.1 mm or more) extracted by the image processing software.
Table 1 shows the results of the hole area ratio when the arithmetic mean value is used when the same test piece is measured twice.

As shown in Table 1, in the elastic sheet 1 of the example, the aspect ratio of the elastic fiber is in a suitable range and the elasticity increasing treatment is performed by performing the cooling step at a suitable position as compared with that of the comparative example. After that, the appearance of the sheet will be good. Therefore, according to the present invention, it is possible to obtain a stretchable sheet having a good appearance and high elasticity, and such a sheet can be manufactured with high productivity.

1 Telescopic sheet 1A Joined body 2,21,22 Non-woven fabric 3 Elastic fiber 40 Gear roll 100 Manufacturing equipment 130 Spinning equipment 140 Stretching equipment X Width direction Y Longitudinal direction (stretching direction)

Claims (9)

A stretchable sheet comprising a non-woven fabric and a plurality of elastic fibers bonded to the surface of the non-woven fabric and having elasticity in at least one direction.
The elastic fibers are directly bonded to the surface of the non-woven fabric, and the elastic fibers are directly bonded to the surface of the non-woven fabric.
In a cross-sectional view orthogonal to the longitudinal direction of the elastic fiber, the shape of the elastic fiber is a perfect circle, or in the cross-sectional view, a line segment having a maximum crossing length of the elastic fiber is taken as a long axis. The ratio of the length of the major axis to the length of the minor axis is expressed when the line segment of the other side of the virtual ellipse having two sides parallel to the outer circumference of the elastic fiber is defined as the minor axis. An elastic sheet for absorbent articles having an aspect ratio of more than 1 and 1.1 or less. The aspect ratio is more than 1 and 1.1 or less.
A claim that the angle between the virtual extension line of the long axis and the surface of the non-woven fabric on the acute angle side is 45 degrees or less when the elastic sheet is viewed in cross section so as to be orthogonal to the longitudinal direction of the elastic fiber. The elastic sheet for absorbent articles according to 1. The elastic sheet for an absorbent article according to claim 1 or 2, wherein a plurality of the elastic fibers are arranged so as to extend in the elastic direction. The stretchable sheet for an absorbent article according to any one of claims 1 to 3, wherein the nonwoven fabric is a spunbonded nonwoven fabric. An absorbent article comprising the elastic sheet for the absorbent article according to any one of claims 1 to 4. The molten elastic fibers are brought into contact with the surface of the non-woven fabric to form a bonded body in which the elastic fibers are bonded to the surface of the non-woven fabric.
A method for producing an elastic sheet for an absorbent article, in which the joint is cooled by a fluid. The method for producing an elastic sheet for an absorbent article according to claim 6, wherein the cooled joint body is subjected to an elasticity increasing treatment. The method for producing an elastic sheet for an absorbent article according to claim 6 or 7, wherein a spunbonded nonwoven fabric is used as the nonwoven fabric. The method for producing an elastic sheet for an absorbent article according to any one of claims 6 to 8, wherein the bonded body is cooled within 0.15 seconds after the elastic fiber is brought into contact with the non-woven fabric.

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