JP2022122167A - Stretchable sheet for absorbent article and method for manufacturing the same - Google Patents

Abstract

To provide a stretchable sheet for an absorbent article having an excellent air permeability, blocking resistance and excellent storage stability, and a method for manufacturing the same.SOLUTION: A method for manufacturing a stretchable sheet for an absorbent article of the present invention comprises: a composite nonwoven fabric manufacturing step in which a plurality of melted or softened elastic filaments 3 spun from a plurality of spinning nozzles are brought into contact with one surface of an original nonwoven fabric 4 before solidification of the elastic filaments 3 to obtain a composite nonwoven fabric 5 in which the elastic filaments 3 are fused to one surface of the original nonwoven fabric 4 while being exposed; a surface roughness imparting step of forming unevenness in a non-contact portion itself with the original nonwoven fabric 4 on the surface of the elastic filament 3; and a stretching step of the composite nonwoven fabric 5.SELECTED DRAWING: Figure 5

Description

TECHNICAL FIELD The present invention relates to a stretch sheet for absorbent articles and a method for producing the same.

From the viewpoint of fitting an absorbent article such as a diaper to the body, a stretchable sheet member formed by joining an elastic member such as rubber thread between two sheets is used as a structural member of the absorbent article. As such a sheet member, for example, Patent Document 1 discloses a structure in which a plurality of non-stretchable elastic filaments arranged so as to extend in one direction without intersecting each other are sandwiched between two extensible nonwoven fabrics. A stretchable sheet is described.

Also known is a technique for imparting various properties to fibers by attaching particles to the surfaces of the fibers. For example, Patent Document 2 describes a nonwoven fabric containing constituent fibers in which a plurality of hydrophobic particles are adhered to the surface of the fiber and a plurality of protrusions caused by the particles protrude from the surface of the fiber. The nonwoven fabric described in Patent Document 2 is difficult to perceive wet even when it is wet, and is considered useful as a member of an absorbent article positioned farthest from the wearer's skin.

Patent Document 3 describes a core-sheath type composite elastic filament having stretch elasticity, in which a large number of ridges protruded along the circumferential direction are arranged in the fiber axis direction and has a rough surface. The composite elastic filament described in Patent Document 3 has a small coefficient of friction on the surface, and clothing such as stockings made of this filament that directly touches the skin adheres to the skin due to its elasticity. It is said to give a comfortable feeling of wearing without the slimy feeling of thread.

Japanese Patent Application Laid-Open No. 2009-30182 JP 2016-108714 A WO 1992/000408

When the elastic sheet described in Patent Document 1 is applied as a forming material for various wearing articles including absorbent articles, it exhibits excellent fitting properties due to the action of the elastic filaments, and the wearing article does not slip off. In particular, a stretch sheet having a structure in which elastic filaments are interposed between two nonwoven fabrics has a relatively low airflow resistance, but a plurality of nonwoven fabrics can prevent it. Due to the laminated structure, there is room for improvement in terms of breathability. Therefore, as an improvement technique for the stretch sheet having such a structure, a structure in which a plurality of elastic filaments are bonded to one side of a single nonwoven fabric in an exposed state is conceivable. However, such a stretch sheet having exposed elastic filaments is a pair in which the elastic filaments in a melted or softened state spun out from the spinning nozzle take the elastic filaments together with the nonwoven fabric and press them together during the production. Since the elastic filament comes into contact with one of the rolls, there is a risk that the elastic filament will be entangled by the one roll, resulting in problems such as failure to obtain the quality as designed and contamination of the manufacturing equipment. In addition, after production, so-called blocking tends to occur due to the exposed elastic filaments becoming tacky, and there is room for improvement in terms of handling and storage stability.

An object of the present invention is to provide a stretch sheet for absorbent articles which has excellent air permeability, blocking resistance, and excellent storage stability, and a method for producing the same.

The present invention relates to a stretchable absorbent article, in which a plurality of non-stretched elastic filaments arranged so as to extend in one direction without intersecting each other are joined by fusion to one surface of a stretchable nonwoven fabric. is a sheet.
In one embodiment of the stretchable sheet for absorbent articles of the present invention, portions of the elastic filaments other than the portions fused to the nonwoven fabric are exposed, and the surface of the exposed portion of the elastic filaments is coated with the elastic filaments themselves. Roughness is given due to unevenness.

Further, the present invention provides a stretchable absorbent article in which a plurality of non-stretched elastic filaments arranged so as to extend in one direction without intersecting each other are bonded to one surface of an extensible nonwoven fabric in an exposed state. A sheet manufacturing method.
In one embodiment of the method for producing a stretch sheet for absorbent articles of the present invention, a plurality of molten or softened elastic filaments spun from a plurality of spinning nozzles are applied to one side of a raw nonwoven fabric before solidification of the elastic filaments. to obtain a fused composite nonwoven fabric with the elastic filaments exposed on one side of the raw nonwoven fabric.
One embodiment of the method for producing a stretch sheet for absorbent articles of the present invention has a surface roughening step of forming irregularities on the non-contact portions of the surface of the elastic filaments themselves with the original nonwoven fabric.
One embodiment of the method for producing a stretch sheet for absorbent articles of the present invention has a step of stretching the composite nonwoven fabric.

In another embodiment of the method for producing a stretch sheet for absorbent articles of the present invention, a plurality of melted or softened elastic filaments spun from a plurality of spinning nozzles are spun into a raw nonwoven fabric before solidification of the elastic filaments. to obtain a composite nonwoven fabric in which the elastic filaments are fused to one surface of the raw nonwoven fabric, and a release sheet is placed on the surface of the elastic filament at the non-contact portion with the raw nonwoven fabric. contacting to obtain a laminated sheet in which the elastic filaments are interposed between the raw nonwoven fabric and the release sheet;
removing the release sheet from the laminated sheet;
and stretching the composite nonwoven fabric.
In another embodiment of the method for producing a stretch sheet for absorbent articles of the present invention, the release sheet is mainly made of a material that does not melt or thermally decompose at 200°C.
Other features, advantages and embodiments of the invention are described below.

ADVANTAGE OF THE INVENTION According to this invention, the stretch sheet for absorbent articles which is excellent in breathability, blocking resistance, and storage stability is provided. Moreover, according to the method for producing a stretch sheet for absorbent articles of the present invention, the stretch sheet for absorbent articles can be produced efficiently.

FIG. 1 is a perspective view showing one embodiment of the elastic sheet for absorbent articles of the present invention. FIG. 2 is an electron micrograph (observation magnification of 150) of an elastic filament and its vicinity in one embodiment of the stretchable sheet for absorbent articles of the present invention. FIG. 3 is a perspective view schematically showing an example of a composite nonwoven fabric production step in the method for producing a stretch sheet for absorbent articles of the present invention. FIG. 4 is a perspective view schematically showing an example of the stretching step in the method for producing a stretch sheet for absorbent articles of the present invention. FIG. 5 is a diagram schematically showing an example of the surface roughness imparting step in the method for producing a stretch sheet for absorbent articles of the present invention, in which the radial direction of a pair of rolls to which elastic filaments in a molten or softened state are supplied. 1 is a schematic cross-sectional view along . FIG. 6 is a view equivalent to FIG. 5 showing another example of the surface roughness imparting step in the method for producing a stretch sheet for absorbent articles of the present invention. FIG. 7 is a view equivalent to FIG. 5 showing an example of steps for obtaining a laminated sheet in one embodiment of the method for producing a stretchable sheet for absorbent articles of the present invention. FIG. 8 is a view equivalent to FIG. 5 showing another example of the process of obtaining a laminated sheet in one embodiment of the method for producing a stretchable sheet for absorbent articles of the present invention.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described based on its preferred embodiments with reference to the drawings. In addition, in the following description of the drawings, the same or similar reference numerals are given to the same or similar parts. The drawings are basically schematic, and the ratio of each dimension may differ from the actual one.

FIG. 1 shows a stretch sheet 1 which is one embodiment of the stretch sheet for absorbent articles of the present invention. The elastic sheet 1 is composed of a plurality of non-stretched elastic filaments 3 arranged so as to extend in one direction without intersecting each other and joined by fusion to one surface of a stretchable nonwoven fabric 2. .

The stretchable sheet 1 of this embodiment has a longitudinal direction X and a width direction Y perpendicular to the longitudinal direction X. As shown in FIG. The longitudinal direction X corresponds to the flow direction of the stretch sheet 1 at the time of manufacture, the so-called machine direction (hereinafter also referred to as "MD"), and the width direction Y corresponds to CD (Cross Direction) orthogonal to MD. .

The nonwoven fabric 2 has extensibility. In this embodiment, the nonwoven fabric 2 is stretchable in the direction in which the elastic filaments 3 extend (longitudinal direction X). Specifically, when the elongation rate (change in length) of the nonwoven fabric measured by the following method is 30% or more, the nonwoven fabric can be said to have elongation. The elongation rate of the nonwoven fabric 2 is not particularly limited, but from the viewpoint of improving the stretchability of the stretchable sheet 1, it is preferably 100% or more and 300% or less.

<Method for measuring elongation rate>
Two marks extending in the width direction are attached to the stretch sheet 1 to be measured at intervals of 1 cm in the longitudinal direction, and the elastic filaments 3 are removed from the stretch sheet 1, and the remaining nonwoven fabric 2 contains two marks. , a rectangular shape of 2 cm in the longitudinal direction and 1 cm in width in a plan view is cut out to obtain a test piece. In preparing such a test piece, as a method for removing the elastic filaments 3 from the stretch sheet 1, an organic solvent in which the nonwoven fabric 2 is insoluble and only the elastic filaments 3 are soluble is used, and only the elastic filaments 3 are dissolved. , and a method of air-drying the nonwoven fabric 2 . For example, when the elastic filaments 3 are made of a thermoplastic elastomer styrene block copolymer and the nonwoven fabric 2 is made of polypropylene, toluene can be used as the organic solvent.
The longitudinal direction of the test piece is aligned with the tensile direction, and the two marked portions of the test piece are attached to a chuck of a tensile tester (RTM100 Tensilon tensile tester manufactured by Orientec Co., Ltd.). At this time, the chuck-to-chuck distance is set to 1 cm. Then, the test piece is pulled up to a load of 50 g at a pulling speed of 100 mm/min, and the length of the test piece is measured. Then, the elongation rate is calculated by the following formula.
Elongation rate (%) = [{Length of test piece after pulling (mm) - Length of test piece before pulling (mm)} / Length of test piece before pulling (mm) ×] 100

The stretch sheet to be measured is used as a constituent member of other articles such as absorbent articles, and when the stretch sheet is taken out for evaluation and measurement, the stretch sheet is If it is fixed to a component, remove it after removing the fixation by applying an organic solvent to the fixed part, blowing cold air from a cold spray, or the like. This procedure is common to all measurements in this specification.

The following (1) and (2) are given as specific examples of the “nonwoven fabric having extensibility”.
(1) A configuration in which the constituent fibers themselves of the nonwoven fabric are stretched.
(2) Even if the constituent fibers themselves are not stretched, the fibers bonded at the intersection point may separate, or the three-dimensional structure formed by multiple fibers may structurally change due to the bonding of the fibers. A form in which the entire nonwoven fabric stretches as the fibers are torn or the slackness of the fibers is stretched.

In this embodiment, the nonwoven fabric 2 has the form (2). Specifically, as shown in FIG. 1, the nonwoven fabric 2 includes a low basis weight portion (low basis weight portion) 21 and a high basis weight portion that contains more materials (fibers) for forming the nonwoven fabric 2 than the low basis weight portion 21. (High basis weight portion) 22 . The low basis weight parts 21 and the high basis weight parts 22 are alternately arranged in the extending direction (longitudinal direction X) of the elastic filaments 3 . The low basis weight portion 21 and the high basis weight portion 22 each extend along the width direction Y orthogonal to the extending direction of the elastic filaments 3 . The low basis weight portion 21 and the high basis weight portion 22 are formed in the nonwoven fabric 2 by a stretchability-imparting step, which will be described later. Due to the stretchability imparting step, the nonwoven fabric 2 has stretchability that allows it to stretch along the extending direction of the elastic filaments 3 (longitudinal direction X).

In this embodiment, each of the plurality of elastic filaments 3 is continuous over the entire length of the stretch sheet 1 in the longitudinal direction X and extends linearly.
In the present invention, the elastic filaments 3 need not intersect with each other, and may, for example, extend in one direction while meandering.
The elastic filaments 3 are joined to the nonwoven fabric 2 in a non-stretched state. The "unstretched state" referred to here refers to the most contracted state when no external force acts on the elastic filament 3, and is basically the same as the "natural state".

The elastic filaments 3 are joined to the nonwoven fabric 2 by fusion. In other words, the elastic filament 3 and the nonwoven fabric 2 are joined by melting at least one of the resins constituting both, and not by using an adhesive such as a hot-melt adhesive. Therefore, no adhesive exists between the nonwoven fabric 2 and the elastic filaments 3 . The term “no adhesive” as used herein means not only a form in which the basis weight of the adhesive is zero, but also, strictly speaking, a relatively small amount of adhesive (for example, 1 g/m ² or less) is present, but the nonwoven fabric 2 and the elastic filament 3 can be bonded to each other, and there is substantially no adhesive. From the viewpoint of improving the bonding strength between the elastic filaments 3 and the nonwoven fabric 2, the elastic filaments 3 are preferably fused to the nonwoven fabric 2 over their entire lengths.

The stretchable sheet 1 stretches along the direction in which the elastic filaments 3 extend (longitudinal direction X). The stretchability of the stretchable sheet 1 is exhibited due to the elasticity of the elastic filaments 3 . By "elastic" is meant the property of being able to stretch and contract upon release from the stretching force. When the elastic sheet 1 is stretched along the extending direction of the elastic filaments 3, the elastic filaments 3 and the nonwoven fabric 2 are elongated. When the stretching of the stretchable sheet 1 is released, the elastic filaments 3 contract, and the nonwoven fabric 2 returns to the state before stretching along with the contraction. In the stretchable sheet 1, the elastic filaments 3 do not intersect with each other, so when the stretchable sheet 1 is stretched along the extending direction of the elastic filaments 3, the stretchable sheet 1 is stretched in the direction perpendicular to the stretched direction. It can be stretched without causing shrinkage, so-called width shrinkage.

Although the basis weight of the stretchable sheet 1 is not particularly limited, it is preferable to set it as follows from the viewpoint of improving stretchability.
The basis weight of the stretch sheet 1 as a whole is preferably 10 g/m ² or more, more preferably 20 g/m ² or more, and preferably 70 g/m ² or less, more preferably 50 g/m ² or less.
The basis weight of the low basis weight portion 21 in the nonwoven fabric 2 is preferably 3 g/m ² or more, more preferably 7 g/m ² or more, and preferably 20 g/m ² or less, more preferably 15 g/m ² or less. be.
The basis weight of the high basis weight portion 23 in the nonwoven fabric 2 is preferably 5 g/m ² or more, more preferably 10 g/m ² or more, and preferably 50 g/m ² or less, more preferably 30 g/m ² or less.

The thickness of the nonwoven fabric 2 is preferably 0.05 mm or more, more preferably 0.1 mm or more, still more preferably 0.15 mm or more, and preferably 5 mm or less, more preferably 1 mm or less, and still more preferably 0.5 mm or less. be.
The thickness of the nonwoven fabric 2 is measured by the following method. A razor is applied to the stretch sheet 1 containing the nonwoven fabric 2 to be measured, and the upper portion of the razor is hit with a hammer or the like to cut the stretch sheet 1 in the thickness direction. With the cut stretch sheet 1 sandwiched between flat plates and a load of 0.5 cN/cm ² applied to the stretch sheet 1, the cross section of the stretch sheet 1 is observed with a microscope at a magnification of 50 to 200 times, The thickness of the nonwoven fabric 2 is measured in the observation field. The measurement is performed at arbitrary three points on the cross section of the elastic sheet 1 and the average value thereof is taken as the thickness of the nonwoven fabric 2 .

The distance between adjacent elastic filaments 3 is preferably 0.4 mm or more, more preferably 0.6 mm or more, and preferably 2 mm or less, more preferably 1 mm or less, still more preferably 1 mm or less.
The distance between adjacent elastic filaments 3 is determined by cutting the elastic sheet 1 containing the elastic filaments 3 to be measured in a direction orthogonal to the extending direction of the elastic filaments 3, and observing the cut surface with a microscope at a predetermined magnification. Then, the interval between the elastic filaments 3 adjacent to each other in the observation field is measured. The measurement is performed at arbitrary 100 points, and the average value thereof is taken as the interval between adjacent elastic filaments 3 .

Examples of the nonwoven fabric 2 include an air-through nonwoven fabric, a heat roll nonwoven fabric, a spunlace nonwoven fabric, a spunbond nonwoven fabric, a meltblown nonwoven fabric, and the like. These nonwovens can be continuous filament or staple fiber nonwovens.
As the constituent fibers of the nonwoven fabric 2, for example, inelastic fibers made of a substantially inelastic resin can be used, and in that case, the nonwoven fabric 2 can be an extensible fiber layer mainly composed of the inelastic fibers. Examples of such inelastic fibers include fibers made of polyesters such as polyethylene (PE), polypropylene (PP), polyethylene terephthalate (PET) and polybutylene terephthalate (PBT), polyamides, and the like. The constituent fibers of the nonwoven fabric 2 may be short fibers or long fibers, and may be hydrophilic or water-repellent. In addition, core-sheath type or side-by-side type conjugate fibers, split fibers, modified cross-section fibers, crimped fibers, heat-shrinkable fibers, and the like can also be used. These fibers can be used singly or in combination of two or more.

The elastic filament 3 is made of, for example, a thermoplastic elastomer, rubber, or the like. In particular, when a thermoplastic elastomer is used as a raw material, it can be melt-spun using an extruder like a normal thermoplastic resin, and the elastic filaments thus obtained are easy to heat-seal. is suitable for Examples of thermoplastic elastomers include styrenes such as SBS (styrene-butadiene-styrene), SIS (styrene-isoprene-styrene), SEBS (styrene-ethylene-butadiene-styrene), and SEPS (styrene-ethylene-propylene-styrene). elastomer, olefin elastomer (ethylene-based α-olefin elastomer, propylene-based elastomer obtained by copolymerizing ethylene/butene/octene, etc.), polyester-based elastomer, polyurethane-based elastomer, etc., and one of these may be used alone or Two or more kinds can be used in combination. Moreover, core-sheath type or side-by-side type composite fibers made of these resins can also be used.

As shown in FIG. 1, the elastic sheet 1 is characterized in that portions of the elastic filaments 3 other than the fused portions with the nonwoven fabric 2 are exposed.
In this embodiment, the elastic sheet 1 is composed of one nonwoven fabric 2 and a plurality of elastic filaments 3 arranged on one side of the one nonwoven fabric 2, and the elastic filaments 3 are fused to the nonwoven fabric 2. All other parts are exposed.
Conventional elastic sheets having a structure in which elastic filaments are interposed between two non-woven fabrics and in which the elastic filaments are not exposed, the non-woven fabric tends to act as resistance when stretched and contracted, and the elasticity inherent in the elastic filaments is lost. However, since the elastic filaments 3 are exposed, the stretch sheet 1 has a portion that does not restrict the movement accompanying the extension and contraction of the elastic filaments 3. Such problems have been solved. Therefore, the stretchable sheet 1 is superior in stretchability compared to the conventional stretchable sheets described above, and can be stretched, for example, to the stretchable length of the nonwoven fabric 2 or the maximum stretchability of the elastic filaments 3 . Moreover, the stretch sheet 1 has a smaller number of layers of non-woven fabrics that provide airflow resistance than conventional stretch sheets in which the elastic filaments are not exposed, and thus has excellent breathability.
The stretch sheet 1 can be suitably used as a constituent member of an absorbent article due to its excellent breathability and stretchability. For example, the stretchable sheet 1 can be used as an exterior body forming the outer surface of a diaper. In such a diaper, since the elastic filaments 3 shrink well when worn, the diaper fits well to the wearer's body. Moreover, it is preferable that the stretchable sheet 1 used as the outer covering is incorporated into the diaper so that the longitudinal direction X of the stretchable sheet 1 extends along the circumference of the diaper. When such a diaper is put on by the wearer, the outer body stretches well in the waist circumference direction, so that it can be easily unfolded with a small force.

As described above, the stretch sheet 1 has excellent breathability and stretchability due to the exposed elastic filaments 3. However, it has a unique problem that is not found in conventional stretch sheets in which the is interposed. Specifically, the stretch sheet 1 has low blocking resistance due to the exposed elastic filaments 3 that may have stickiness, and there are concerns about low handling properties and storage stability. For example, in a stretch sheet roll in which a long stretch sheet is wound into a roll, overlapping stretch sheets adhere to each other via elastic filaments, so-called blocking, which makes it difficult to unwrap the stretch sheet from the roll. is concerned.

However, in the stretchable sheet 1, the surface of the exposed portion of the elastic filaments 3 is roughened due to the irregularities of the elastic filaments 3 themselves. Problems due to exposed elastic filaments 3 such as blocking are solved.

The above-mentioned "roughness caused by unevenness of the elastic filament itself" means that the surface of the elastic filament itself has unevenness due to, for example, fine scratches on the surface of the elastic filament. It means that the surface is not smooth (the surface is not smooth). Therefore, for example, when a substance other than the elastic filament, such as a fine material described later, adheres to the surface of the elastic filament which has a smooth surface and does not have unevenness, the surface has unevenness. If it does, it does not mean that "roughness caused by unevenness of the elastic filament itself" is imparted.

FIG. 2 shows an electron micrograph of a portion of the elastic filament arrangement surface of the stretch sheet having the same basic configuration as that of the stretch sheet 1. As shown in FIG. In FIG. 2, the obliquely crossing belt-like object is the exposed portion of the elastic filaments, and the numerous fibrous objects above and below the exposed portion are the constituent fibers of the nonwoven fabric to which the elastic filaments are fused. be. The irregular white patterns present on the surface of the exposed portions of the elastic filaments are the "unevennesses of the elastic filaments themselves" and are scattered over the entire surface. Thus, in the stretch sheet shown in FIG. 2, the surface of the exposed portion of each of the plurality of elastic filaments is roughened due to the irregularities of the elastic filaments themselves.

In the article such as the alleged patent infringement product, the determination of whether or not the surface of the exposed portion of the elastic filament in the elastic sheet provided in the article has the above-mentioned "roughness due to unevenness of the elastic filament itself" is given. It can be carried out by observing the exposed portion with an electron microscope. In that case, if an irregular pattern or the like as shown in FIG. A portion other than the fused portion is exposed, and the surface of the exposed portion of the elastic filament is provided with roughness due to unevenness of the elastic filament itself.” When the stretch sheet to be observed is fixed to another member with an adhesive or the like, the fixation is released by the method described above, and then the stretch sheet is taken out and subjected to electron microscope observation. In addition, when the stretch sheet to be observed is fixed to another member by fusion such as heat sealing and it is difficult to release the fixation, the portion of the stretch sheet other than the fused portion may be the object to be observed. Just do it.

In addition, for the "stretch sheet having exposed portions of elastic filaments" such as the product of the present invention, a nonwoven fabric is placed and fixed on the surface on which the elastic filaments are arranged (the surface on which the exposed portions of elastic filaments are present). When an article having a structure in which elastic filaments are interposed between sheets of nonwoven fabric, the article does not seem to have exposed elastic filaments. Yet that fact may be overlooked. However, whether or not a stretch sheet having exposed portions of elastic filaments is used can be determined by observing the joints between the elastic filaments and the nonwoven fabric in the stretch sheet with an electron microscope. That is, the stretch sheet having the exposed portions of the elastic filaments is typically prepared by adding melted or softened elastic filaments to one side of the original nonwoven fabric before solidifying the elastic filaments, as in the production method of the present invention described below. In this case, heat fusion occurs between the raw nonwoven fabric and the molten or softened elastic filaments due to the heat brought by the elastic filaments. On the other hand, when the nonwoven fabric is fixed with an adhesive to the elastic filament arrangement surface of the stretch sheet having the elastic filament exposed portion, the heat fusion does not occur, and heat is applied from the elastic filament non-arrangement side. When the nonwoven fabric and the elastic filament are fused together by sealing or ultrasonic treatment, the fused part is formed to cover the entire thickness of the nonwoven fabric. Then, the method of joining the elastic filaments to the nonwoven fabric is by the heat fusion, or the nonwoven fabric is placed on the arrangement surface of the elastic filaments of the product of the present invention, and the adhesive or heat treatment or ultrasonic treatment is used. Whether or not it is fixed by fusion can be easily determined by observing the joint between the elastic filament and the nonwoven fabric with an electron microscope.

In the stretch sheet shown in FIG. 2, cellulose fibers are adhered as a fine material to the surface of the exposed portions of the elastic filaments. In this way, since the surface of the exposed portion of the elastic filament is provided with the "unevenness of the elastic filament itself" and the fine material is attached, the exposed portion is compared with the case where the fine material is not attached. Since the degree of unevenness (numerical value of surface roughness) on the surface of the stretch sheet is increased, the blocking resistance and storage stability of the stretch sheet can be further improved.

The adhesion area ratio of the fine material on the surface of the exposed portion of the elastic filament is preferably 1% or more, more preferably 3% or more, and preferably 20% or less, more preferably 10% or less. The adhered area ratio of the fine material is the ratio of the total area of the fine material present in the exposed portion to the area of the exposed portion of the elastic filament, and is measured by a method according to <Method for Measuring Roughening Ratio> described later. can do. If the adhesion area ratio of the fine material is too low, it is meaningless to attach the fine material to the surface of the exposed part of the elastic filament. There is a risk that the user will perceive the falling off of the material.

The means for adhering the fine material to the surface of the elastic filament is not particularly limited, and is typically fusion by melting the resin that constitutes the elastic filament. It may be attached. Further, depending on the type of fine material, the fusion may be achieved by melting the resin that constitutes the fine material.

The fine material may be any material as long as it has a certain degree of hardness and abrasion resistance. Typically, it is a material different from that of the elastic filament, but the same material as that of the elastic filament may also be used. Materials that can be used as fine materials include, for example, cellulose fibers, plastics, glass, ceramics, carbon, and the like, and these can be used singly or in combination of two or more.

The shape of the fine material is not particularly limited, and may be, for example, an elongated fibrous shape or a particulate shape.
The average longitudinal length (average fiber length) of the fibrous fine material is preferably 1 μm or more, more preferably 100 μm or more, and preferably 10 mm or less, more preferably 5 mm or less. If the average fiber length of the fibrous fine material is too short, the effect of the fine material adhering to the surface of the elastic filament may not be sufficiently exhibited. For example, if a fine material with a relatively long longitudinal length falls off from the surface of the elastic filament during use of the elastic sheet, it will be misidentified as a foreign object and the reliability of the product will be impaired. There is a risk that
The average particle size of the particulate fine material is preferably 1 μm or more, more preferably 100 μm or more, and preferably 2 mm or less, more preferably 1 mm or less.

Since the fine material is typically attached to the surface of the elastic filament by bringing it into contact with the elastic filament in a molten or softened state, the fine material does not deteriorate even when it comes into contact with the elastic filament in a molten or softened state. A material that does not melt or thermally decompose at 200° C. is preferable. Examples of such materials include cellulose fibers, glass fibers, and the like, and these materials can be used singly or in combination of two or more. Examples of cellulose fibers include bleached wood pulp such as softwood bleached kraft pulp (NBKP), softwood bleached sulfite pulp (NBSP), hardwood bleached kraft pulp (LBKP), natural cellulose fibers such as cotton and hemp; Examples thereof include regenerated cellulose fibers such as lyocell and cupra.

A "roughening ratio" can be used as an index of the surface roughness of the exposed portion of the elastic filament. The roughening ratio is the ratio of the total area of unevenness existing in the exposed portion to the area of the exposed portion of the elastic filament, and is measured by the following method. The "unevenness existing in the exposed portion" as used herein includes both the "unevenness of the elastic filament itself" and the "unevenness caused by adhesion of the fine material". That is, when the exposed portion of the elastic filament does not have a fine material adhered thereto, the roughening rate of the exposed portion reflects the "roughness caused by unevenness of the elastic filament itself". When fine materials adhere to the part, both the above-mentioned "roughness caused by unevenness of the elastic filament itself" and "roughness caused by unevenness caused by adhesion of fine material" are reflected.

<Method for measuring surface roughening ratio>
In this measurement method, the area of the projected image when the exposed portion of the elastic filaments in the sheet to be measured is projected in the thickness direction of the sheet is measured, and the total area of the unevenness existing in the projected image is measured. The ratio of the latter to the is calculated as the roughening rate of the exposed portion.
Specifically, using a scanning electron microscope (SEM), the exposed portion of the elastic filament in the sheet to be measured is observed and imaged from the thickness direction of the sheet, and the imaged image is processed by image processing software. . The magnification of observation by SEM is such that the area of unevenness in the exposed portion of the elastic filament to be observed can be analyzed, and is, for example, about 150 times. FIG. 2 can be an image from which the area of unevenness in the exposed portion of the elastic filament can be analyzed. As the image processing software, for example, GIMP (GNU Image Manipulation Program), which is general-purpose image editing/processing software, can be used. The image processing includes the operation of coloring the unevenness (the unevenness of the elastic filament itself, the unevenness due to the adhesion of the fine material) existing in the exposed portion of the elastic filament in the captured image with a predetermined color. The number of pixels in the colored portion in the image is counted, the number of pixels in the entire exposed portion of the elastic filament including the colored portion is counted, and the former is divided by the latter to calculate the roughening ratio. For example, when the number of pixels of the colored portion (i.e. unevenness) in the SEM image is 21528 pixels, and the number of pixels of the entire exposed portion of the elastic filament including the colored portion is 67974 pixels, the roughening rate of the exposed portion is 32% [=(21528/67974)×100].

The roughening rate of the exposed portion of the elastic filament is preferably 10% or more, more preferably 20% or more, from the viewpoint of more reliably solving problems caused by the exposed portion such as blocking. The upper limit of the roughening rate of the exposed portions of the elastic filaments is not particularly limited, but if the roughening rate is too high, the elastic filaments are entangled from the nonwoven fabric as the exposed portions are roughened. It is preferably 75% or less, more preferably 65% or less, because there is a possibility that it will be lost.

The method for measuring the adhered area ratio of the fine material may be obtained by replacing the "unevenness" of the exposed portion of the elastic filament with the "fine material" in the <Method for measuring the surface roughening rate>. That is, in the above-mentioned "operation of coloring the unevenness existing in the exposed portion of the elastic filament with a predetermined color", the "unevenness of the elastic filament itself" is not colored, and only the "unevenness due to the adhesion of the fine material" is colored. , the colored portion. Except for this point, the adhered area ratio of the fine material can be measured basically in the same manner as in <Method for measuring surface roughening ratio>.

Next, the method for manufacturing the stretch sheet for absorbent articles of the present invention is applied to the above-mentioned stretch sheet 1 (a non-stretchable nonwoven fabric 2 having stretchability arranged so as to extend in one direction without crossing each other). A method of manufacturing a stretchable sheet for an absorbent article, in which a plurality of elastic filaments 3 are joined together in an exposed state, will be described as an example.

As shown in FIG. 3, the stretch sheet 1 is manufactured by forming a plurality of molten or softened elastic filaments 3 spun from a plurality of spinning nozzles 11a into a raw nonwoven fabric 4 before solidification of the elastic filaments 3. a step of contacting one surface to obtain a composite nonwoven fabric 5 fused with the elastic filaments 3 exposed on one surface of the original nonwoven fabric 4 (composite nonwoven fabric manufacturing step), as shown in FIG. , and a step (stretching step) of stretching the composite nonwoven fabric 5 in the MD, and the intended stretch sheet 1 is manufactured through the stretching step.

The raw nonwoven fabric 4 is different from the nonwoven fabric 2 constituting the elastic sheet 1 in that it does not inherently have stretchability in MD (it does not have a low basis weight portion 21 and a high basis weight portion 22), The composition of the constituent fibers is the same as that of the nonwoven fabric 2 .

As shown in FIG. 3, the spinning apparatus 10 used for the manufacturing process of the composite nonwoven fabric includes a spinning head 11 for spinning a molten resin from a spinning nozzle 11a into a molten or softened elastic filament 3, a spinning nozzle A pair of rolls 12 and 13 are provided for taking out the plurality of elastic filaments 3 spun from 11 a together with the original nonwoven fabric 4 . The spinning nozzles 11a are intermittently arranged at the lower end of the spinning head 11 along the CD. The spinning head 11 is connected to a melt extruder (not shown) that melts the elastic resin chips that are the raw material of the elastic filaments 3 and feeds them to the spinning head 11 . The basic configuration of the spinning device 10, including the spinning head 11, is the same as that of a known melt-blowing spinning device without the hot air jetting mechanism. One first roll 12 of the pair of rolls 12 and 13 has a larger diameter than the other second roll 13 . The spinning head 11 and the pair of rolls 12 and 13 are electrically connected to a control unit (not shown), and the control unit controls the resin discharge speed by the spinning head 11 and the take-up speed by the pair of rolls 12 and 13. can be adjusted.

In the composite nonwoven fabric manufacturing process, a plurality of melted or softened elastic filaments 3 spun from the spinning nozzle 11a are supplied between a pair of rolls 12 and 13 together with the original nonwoven fabric 4 . A pair of rolls 12 and 13 draws the elastic filaments 3 before solidification together with the raw nonwoven fabric 4 to stretch the elastic filaments 3 in the MD. The elastic filaments 3 are fused to the original nonwoven fabric 4 by bringing the elastic filaments 3 before solidification into contact with one surface of the original nonwoven fabric 4 between the pair of rolls 12 and 13 . Such fusion is due to the heat of fusion of the elastic filaments 3 before solidification. The constituent fibers of the original nonwoven fabric 4 are melted by this melting heat, and the elastic filaments 3 and the original nonwoven fabric 4 are joined together. Specifically, only the fibers present around the elastic filaments 3 in the raw nonwoven fabric 4 are fused to the elastic filaments 3, and the fibers present further apart are not fused. At least part of the constituent fibers of the raw nonwoven fabric 4 are thus fused to the elastic filaments 3 . From the viewpoint of further improving the bonding strength, it is preferable that both the elastic filaments 3 and at least some of the constituent fibers of the raw nonwoven fabric 4 are fused together.

In the manufacturing process of the composite nonwoven fabric, the elastic filaments 3 are stretched until the melted or softened elastic filaments 3 and the original nonwoven fabric 4 come into contact with each other, and the molecules are oriented in the stretching direction. This stretching reduces the diameter. From the viewpoint of sufficiently stretching the elastic filaments 3 and preventing the yarn breakage of the elastic filaments 3, the temperature of the elastic filaments 3 is adjusted by blowing wind (hot or cold wind) of a predetermined temperature to the spun elastic filaments 3. You may The stretching of the elastic filaments 3 is not only the stretching of the resin composition (elastic resin) forming the elastic filaments 3 in the molten state (melt stretching), but also the stretching of the softened state in the cooling process (softening stretching). may

From the viewpoint of ensuring fiber fusion bonding and further improving stretchability by maintaining the shape of the elastic filaments 3, the temperature of the elastic filaments 3 when brought into contact with the original nonwoven fabric 4 is preferably 100° C. or higher. It is preferably 120° C. or higher, more preferably 180° C. or lower, and more preferably 160° C. or lower. The temperature of the elastic filaments 3 when brought into contact with the original nonwoven fabric 4 is measured by observing the state of bonding using a film having a melting point different from that of the resin composition forming the elastic filaments 3 . If the elastic filament 3 and the film are fused together, the joining temperature is above the melting point of the film.

In the form shown in FIG. 3, the contact between the elastic filaments 3 in a molten or softened state and the raw nonwoven fabric 4 is caused by winding the raw nonwoven fabric 4 continuous in one direction around the first roll 12 of the pair of rolls 12 and 13. It is carried out by supplying a plurality of elastic filaments 3 between a pair of rolls 12 and 13 while hanging them. A plurality of molten or softened elastic filaments 3 spun from the spinning nozzle 11a are supplied between a pair of rolls 12 and 13 arranged opposite to each other in a state of being arranged in one direction without intersecting each other. 3 and the original nonwoven fabric 4 are pinched by a pair of rolls 12 and 13 . If the clamping pressure is too great, the elastic filaments 3 will tend to bite into the original nonwoven fabric 4, which may impair the texture. The pinching force is sufficient to bring the elastic filaments 3 into contact with the original nonwoven fabric 4, and an excessively high pinching force is not required.

In the form shown in FIG. 3, the unidirectionally continuous composite nonwoven fabric 5 manufactured in the composite nonwoven fabric manufacturing process is wound into a roll to form a composite nonwoven fabric roll 5R, which is used in the next stretching process. . In the stretching step, the composite nonwoven fabric 5 manufactured in the composite nonwoven fabric manufacturing step, more specifically, the raw nonwoven fabric 4 constituting the composite nonwoven fabric 5 is stretched in the MD, and the raw nonwoven fabric 4 is stretched in the MD. The target stretch sheet 1 is manufactured by imparting properties. FIG. 4 shows a drawing process using a drawing device 30 as an example of the drawing process.

The stretching device 30 includes a pair of tooth space rolls 31a and 31b, a roll support shaft 32 disposed on the upstream side of the MD from the tooth space rolls 31a and 31b, and a composite nonwoven fabric roll 5R attached thereto, a roll support shaft 32 and teeth. A pair of infeed rolls 33a and 33b arranged between the grooved rolls 31a and 31b, and a pair of outfeed rolls 34a and 34b arranged downstream of the MD from the tooth groove rolls 31a and 31b. there is By rotationally driving the roll support shaft 32, the composite nonwoven fabric 5 is fed from the composite nonwoven fabric roll 5R, and the fed composite nonwoven fabric 5 is supplied between the tooth groove rolls 31a and 31b by a pair of infeed rolls 33a and 33b. be. A pair of out-feed rolls 34a, 34b draws out the composite nonwoven fabric 5 (stretchable sheet 1) stretched between the tooth groove rolls 31a, 31b from the tooth groove rolls 31a, 31b and conveys it to the next process. The stretching device 30 includes a drive section (not shown) for rotating at least one of the pair of infeed rolls 33a and 33b and the pair of outfeed rolls 34a and 34b.

The pair of tooth groove rolls 31a and 31b may be so-called co-rotating rolls in which both are driven by a drive source, or so-called co-rotating rolls in which only one is driven by a drive source. Teeth extending along the axial direction of the rolls and tooth roots are alternately formed along the circumferential direction on the peripheral surfaces of the pair of tooth groove rolls 31a and 31b. As the tooth profile of the tooth groove rolls 31a and 31b, a general involute tooth profile and a cycloid tooth profile are used, and those having a narrow tooth width are particularly preferable. The pair of tooth groove rolls 31a and 31b are arranged so that one tooth is loosely inserted between the teeth of the other and the other tooth is loosely inserted between the teeth of the other. are combined to form The stretching device 30 has a known elevating mechanism (not shown) for vertically displacing the roll shafts of one or both of the pair of tooth groove rolls 31a and 31b. are made adjustable.

In the stretching step, by supplying the composite nonwoven fabric 5 to the meshing portions of the pair of tooth groove rolls 31a and 31b while the pair of tooth groove rolls 31a and 31b are rotating, the original nonwoven fabric 4 of the composite nonwoven fabric 5 is MD-stretched. (the extending direction of the elastic filaments 3). As a result, a low basis weight portion 21 and a high basis weight portion 22 (see FIG. 1) are formed in the raw nonwoven fabric 4 to impart stretchability along the MD, and the composite nonwoven fabric 5 is formed with the stretch sheet 1 having elasticity in the MD. Become. The low basis weight portion 21 is a region in which the degree of stretching is relatively large in the meshing portion, and the high basis weight portion 22 is a region in which the degree of stretching is relatively small in the meshing portion (typically, it is hardly stretched). not). The degree of stretching of the composite nonwoven fabric 5 can be adjusted by appropriately adjusting the rotation speed (conveyance speed of the workpiece) of the pair of infeed rolls 33a, 33b and the pair of outfeed rolls 34a, 34b. For the stretching step, the technique described in JP-A-2008-179128 can be appropriately used.

In addition to the composite nonwoven fabric manufacturing process and the stretching process, the method for manufacturing the stretch sheet 1 further includes a surface roughness imparting process for forming irregularities on the non-contact portions of the elastic filaments 3 with the original nonwoven fabric 4 themselves. It is characterized by By carrying out the surface roughness imparting step, the surfaces of the exposed portions of the plurality of elastic filaments 3 in the elastic sheet 1 are imparted with the "roughness caused by the unevenness of the elastic filaments 3 themselves".

The surface roughening step is typically performed simultaneously with the composite nonwoven fabric manufacturing step, or after the composite nonwoven fabric manufacturing step and before the stretching step. A method of transferring the surface roughness of another object to the elastic filament 3 in a melted or softened state (see FIGS. 5 to 8), which will be described later, is a specific example of the former. As a specific example of the latter, the surface of the exposed portion of the elastic filament 3 fused and exposed to one surface of the original nonwoven fabric 4 in the composite nonwoven fabric 5 manufactured through the composite nonwoven fabric manufacturing process is subjected to a predetermined A method of imparting fine irregularities (scratches) to the surface of the exposed portion by, for example, rubbing with an object having surface roughness can be used. Regardless of which method is used, in the composite nonwoven fabric roll 5R (see FIG. 3) manufactured through the surface roughness imparting step, the surface of the exposed portion of the elastic filaments 3 has the above-mentioned "unevenness caused by the unevenness of the elastic filaments 3 themselves." "Roughness" is given. For this reason, the composite nonwoven fabric roll 5R has blocking resistance and excellent storage stability, and as shown in FIG.

As a preferred embodiment of the surface roughness imparting step, an object having a predetermined surface roughness is brought into contact with the elastic filament 3 in a molten or softened state, thereby transferring the surface roughness of the object to the elastic filament 3. method. Such a method of transferring the surface roughness of another object to the elastic filaments 3 in a melted or softened state would solve the problem in manufacturing a stretch sheet in which the elastic filaments are exposed, such as the stretch sheet 1. is possible. That is, since the elastic filaments 3 are exposed in the elastic sheet 1, not only the above-described problems after production (such as poor handling and storage stability) but also problems during production are inherent. Specifically, for example, the melted or softened elastic filament 3 swollen from the spinning nozzle 11a is a roll (Fig. In the form shown in 3, there is a concern that it will stick to the second roll 13) and be entangled. By using a roll having a predetermined surface roughness on the peripheral surface of the roll as the roll, the contact area between the elastic filament 3 and the peripheral surface of the roll is reduced, which causes sticking of the elastic filament 3. Since the van der Waals force is reduced, the elastic filaments 3 are less likely to stick to the peripheral surface of the roll. The stretch sheet 1 can be produced efficiently while imparting roughness to the elastic filaments 3 due to the unevenness of the elastic filaments 3 themselves.

In FIG. 5, in the spinning apparatus 10 shown in FIG. 3, instead of the first roll 12 having a smooth roll peripheral surface, a first roll 12A having a roll peripheral surface provided with a predetermined surface roughness is used. It is shown. In the method for manufacturing the elastic sheet 1 in this case, in the composite nonwoven fabric manufacturing process, the raw nonwoven fabric 4 is wrapped around the second roll 13 of the pair of rolls 12A and 13 facing each other while winding the pair of rolls. While being supplied between 12A and 13, a plurality of molten or softened elastic filaments 3 spun from a plurality of spinning nozzles 11a are mixed with a raw nonwoven fabric 4 and the other first roll of the pair of rolls 12A and 13. 12A, and in the surface roughness imparting step, before solidifying the elastic filaments 3 in the molten or softened state, the first roll The peripheral surface of the roll provided with a predetermined surface roughness of 12A is brought into contact. As a result, the elastic filaments 3 are exposed in the composite nonwoven fabric 5 manufactured through the composite nonwoven fabric manufacturing process while effectively preventing the elastic filaments 3 from sticking to the roll peripheral surface of the first roll 12A and becoming entangled. The surface of the portion is given roughness due to the irregularities of the elastic filaments 3 themselves.

In FIG. 6, in the spinning apparatus 10 shown in FIG. 3, instead of the second roll 13 having a smooth roll peripheral surface, a second roll 13A having a roll peripheral surface provided with a predetermined surface roughness is used. It is shown. In the method for manufacturing the elastic sheet 1 in this case, in the composite nonwoven fabric manufacturing process, the original nonwoven fabric 4 is wrapped around one of the pair of rolls 12 and 13A facing each other, the first roll 12, and the pair of rolls While supplying between 12 and 13A, a plurality of molten or softened elastic filaments 3 spun from a plurality of spinning nozzles 11a are mixed with the original nonwoven fabric 4 and the other second roll of the pair of rolls 12 and 13A. 13A, and in the surface roughness imparting step, before solidifying the elastic filaments 3 in a molten or softened state, the second roll The peripheral surface of the roll provided with a predetermined surface roughness of 13A is brought into contact. As a result, the elastic filaments 3 are exposed in the composite nonwoven fabric 5 manufactured through the composite nonwoven fabric manufacturing process while effectively preventing the elastic filaments 3 from sticking to the roll peripheral surface of the second roll 13A and becoming entangled. The surface of the portion is given roughness due to the irregularities of the elastic filaments 3 themselves.

As an example of the rolls 12A and 13A whose circumferential surfaces are provided with a predetermined surface roughness, there are rolls whose circumferential surfaces are surface-treated to increase the frictional force. Examples of the surface treatment include attaching a material having a high coefficient of friction to the peripheral surface of the roll, and subjecting the peripheral surface of the roll itself to surface treatment such as thermal spraying and blasting.
The surface roughness of the peripheral surface of the roll subjected to the surface treatment is preferably 5 μm or more, more preferably 10 μm or more, and preferably 50 μm or less, more preferably 30 μm, when the arithmetic mean roughness Ra is used as an index. It is below. If the Ra of the peripheral surface of the roll is too small, the surface of the exposed portion of the elastic filament cannot be provided with a sufficient irregular shape. There is a risk that it will be removed and hinder the production of the stretch sheet. Ra of the roll peripheral surface can be measured by a general-purpose surface roughness measuring instrument (eg, Surftest SJ-500 manufactured by Mitutoyo Corporation).

Another example of the rolls 12A and 13A having a predetermined surface roughness on the peripheral surface of the roll is a roll having the above-described fine material adhered to the peripheral surface of the roll. By bringing the peripheral surface of the roll on which such a fine material adheres to the elastic filament in the melted or softened state in the surface roughness imparting step, the surface of the exposed portion of the elastic filament, such as the stretch sheet shown in FIG. It is possible to manufacture a stretch sheet to which fine materials are adhered while having "unevenness of the elastic filament itself". In the stretch sheet manufactured in this way, the "unevenness of the elastic filament itself" on the surface of the exposed portion of the elastic filament is formed by transferring the unevenness of the peripheral surface of the roll to which the fine material adheres. The fine material adhering to the surface of the exposed portion of the filament has fallen off from the peripheral surface of the roll.

A specific example of the above-mentioned "roll having a fine material adhered to the peripheral surface of the roll" includes a roll containing, on the peripheral surface of the roll, a material that does not melt or thermally decompose at 200°C. A specific example of such a roll is a cotton roll whose peripheral surface is made of cellulose fibers (a material that does not melt or thermally decompose at 200° C.). As the cotton roll, at least the outermost layer forming the roll peripheral surface is made of a cotton layer. For example, a metal roll or a rubber roll whose roll peripheral surface is covered with a cotton layer can be used. The cotton roll preferably has a Shore D hardness (JIS K7215) of 75 to 85 degrees, particularly 77 to 83 degrees.

FIG. 7 shows the main part of another embodiment of the method for manufacturing the stretchable sheet 1. As shown in FIG. In the embodiments to be described later, configurations different from the above-described embodiments (the spinning device 10 and the drawing device 30) will be described, and the same configurations as those of the above-described embodiments will be assigned the same reference numerals and description thereof will be omitted. The descriptions of the above-described modes are appropriately applied to configurations that are not particularly described in the embodiments described later.

In the method for manufacturing the stretch sheet 1 shown in FIG. 7, a plurality of molten or softened elastic filaments 3 spun from a plurality of spinning nozzles 11a (see FIG. 3) are spun into a raw nonwoven fabric before the elastic filaments 3 are solidified. 4 to obtain a composite nonwoven fabric 5 in which the elastic filaments 3 are fused to one surface of the raw nonwoven fabric 4, and the surface of the elastic filaments 3 and the raw nonwoven fabric 4 are separated from each other. a step of bringing the release sheet 6 into contact with the contact portion to obtain a laminated sheet 7 in which the elastic filaments 3 are interposed between the original nonwoven fabric 4 and the release sheet 6 (laminated sheet manufacturing step); A step of removing the release sheet 6 from the sheet 7 and a step of stretching the composite nonwoven fabric 5 (stretching step) are provided. FIG. 7 shows the state of the laminated sheet manufacturing process.

In the laminated sheet manufacturing process shown in FIG. 7, the raw nonwoven fabric 4 continuous in one direction is wrapped around the second roll 13 of the pair of rolls 12 and 13 facing each other while being wrapped around the pair of rolls 12 and 13 . 13, the release sheet 6 continuous in one direction is supplied between the pair of rolls 12 and 13 while being wound around the other first roll 12, and further, a plurality of spinning nozzles 11a (see FIG. 3). ) is supplied between the raw nonwoven fabric 4 and the release sheet 6, and the raw nonwoven fabric 4 and the elastic filaments 3 (composite nonwoven fabric 5) Also, by pressing the release sheet 6 between the pair of rolls 12 and 13, a laminated sheet 7 continuous in one direction is manufactured. The original nonwoven fabric 4 and the release sheet 6 are fused to the elastic filaments 3 before solidification by contacting them between the pair of rolls 12 and 13 . The laminate sheet 7 thus manufactured has a configuration in which the entire surface of the composite nonwoven fabric 5 on which the elastic filaments 3 are arranged is covered with the release sheet 6 .
7, the original nonwoven fabric 4 may be wound around the first roll 12 and the release sheet 6 may be wound around the second roll 13. As shown in FIG.

Since the release sheet 6 comes into contact with a plurality of elastic filaments 3 in a melted or softened state, the release sheet 6 does not melt even when it comes into contact with such high-temperature elastic filaments 3 , so that it can be easily removed from the laminated sheet 7 . It is preferable that the main component is a material, and from this point of view, the main component is a material that does not melt or thermally decompose at 200° C., which is one of the fine materials described above. The term “mainly” used herein means that the content of a material that does not melt or thermally decompose at 200° C. in the release sheet 6 exceeds 85% by mass with respect to the total mass of the release sheet 6 . The content of the material that does not melt or thermally decompose at 200° C. in the release sheet 6 may be 100 mass %.

A specific example of the release sheet 6 is paper mainly composed of cellulose fibers (a material that does not melt or thermally decompose at 200° C.). As the cellulose fibers contained in the release sheet 6, those that can be used as the fine material described above can be used.
The basis weight of the release sheet 6 made of paper containing cellulose fibers is preferably 9 g/m ² or more, more preferably 12 g/m ² or more, from the viewpoint of imparting necessary and sufficient strength to the release sheet 6. It is preferably 100 g/m ² or less, more preferably 70 g/m ² or less.

The timing of removing the release sheet 6 from the laminate sheet 7 is not particularly limited, and may be after the elastic filaments 3, which were in a molten or softened state when the release sheet 6 was brought into contact, are cooled and solidified.

From the viewpoint of smooth removal of the release sheet 6 from the laminated sheet 7 (laminated body of the composite nonwoven fabric 5 and the release sheet 6), the surface of the composite nonwoven fabric 5 on which the elastic filaments 3 are arranged and the release sheet 6 are arranged. The peel strength is preferably 0.19 N/25 mm or less, more preferably 0.1 N/25 mm or less. Although the lower limit of such peel strength is not particularly limited, it is preferably 0.005 N/25 mm or more.
The peel strength can be adjusted by appropriately adjusting the type of the release sheet 6, the pinching pressure by the pair of rolls 12 and 13, and the like. The peel strength is measured by the following method.

<Method for measuring peel strength>
From the laminate sheet 7 (laminate of the composite nonwoven fabric 5 and the release sheet 6) to be evaluated, a rectangular shape having an MD length of 150 mm and a CD length of 25 mm in plan view is cut out to obtain a test piece. Next, at one end in the longitudinal direction of the test piece, the interlayer between the composite nonwoven fabric 5 and the release sheet 6 was peeled off by 30 mm in the MD to separate the composite nonwoven fabric 5 side and the release sheet 6 side, and the two separated portions ( Portions to be carried by chucks of tensile tester) The test piece is set in a T shape by sandwiching each 10 mm of longitudinal end between a pair of chucks of the tensile tester. The distance between chucks shall be 30 mm. Then, peeling is performed at a tensile speed of 50 mm/min, and the maximum strength is measured. The measurement is performed three times, and the average value of the maximum strength is taken as the peel strength (unit: N/25 mm) of the evaluation target. If the CD length of the test piece is less than 25 mm, a test piece having an appropriate length is prepared, and the average value of the maximum strength after the test is converted into a width of 25 mm. Also, the supporting portion of the test piece may be changed as appropriate depending on the size of the test piece, and may be reduced, for example, from 30 mm. As the tensile tester, for example, "Autograph AG-X" manufactured by Shimadzu Corporation can be used.

When the release sheet 6 is removed from the laminated sheet 7, exposed portions of the elastic filaments 3 fused to the original nonwoven fabric 4 appear. The unevenness of the filament 3 itself is given, and a material that does not melt or thermally decompose at 200° C. (fine material) is attached. The former is formed by transferring the unevenness of the contact surface of the release sheet 6 with the elastic filaments 3 , and the latter is formed when the release sheet 6 is removed from the laminate sheet 7 . It has fallen from The stretch sheet shown in FIG. 2 is manufactured using paper containing cellulose fibers as the release sheet 6, and the fine material adhering to the surface of the elastic filaments in FIG. 2 is cellulose fibers derived from paper. be.

As shown in FIG. 7, the elastic sheet manufacturing method using the release sheet 6 also employs rolls 12A and 13A having a predetermined surface roughness on the roll peripheral surface, as shown in FIGS. Similar to the sheet manufacturing method, the elastic filament 3 is effectively prevented from sticking to and entangling the peripheral surfaces of the pair of rolls 12 and 13 during manufacturing, while having blocking resistance and excellent storage stability. A stretch sheet can be manufactured efficiently.

FIG. 8 shows another example of the stretch sheet manufacturing method using the release sheet 6 . In the form shown in FIG. 8, the third roll 14 is arranged downstream of the second roll 13 in the MD such that the peripheral surface of the third roll 14 faces the peripheral surface of the first roll 12. At the same time, an endless release sheet 6 is stretched over both rolls 13 and 14 so that the release sheet 6 goes around between both rolls 13 and 14 . At least one of the rolls 13, 14 is a drive roll.

In the form shown in FIG. 8, between both rolls 13 and 14, the release sheet 6, the elastic filaments 3, and the original nonwoven fabric 4 are brought into close contact with each other and transported to the MD as a laminated sheet 7 (laminated sheet manufacturing process). When the release sheet 6 separates from the first roll 12 at the position of the third roll 14 and enters a predetermined orbit, the release sheet 6 is removed from the laminated sheet 7, and the remaining composite nonwoven fabric 5 (elastic filaments 3 and raw fabric Nonwoven 4) is transported to MD. In the embodiment shown in FIG. 7, the portion that is pressed from both sides in the thickness direction in the state where the elastic filaments 3 and the original nonwoven fabric 4 are overlapped is only between the pair of rolls 12 and 13, whereas in the embodiment shown in FIG. In terms of form, since it is between the release sheet 6 and the first roll 12 that are stretched from the second roll 13 to the third roll 14, the form shown in FIG. 8 is better than the form shown in FIG. The elastic filaments 3 in the molten or softened state are kept in close contact with the raw nonwoven fabric 4 for a long time. Therefore, for example, even if the processing speed is relatively high and it is difficult to sufficiently solidify the elastic filament 3 in the molten or softened state in the configuration shown in FIG. 7, the configuration shown in FIG. The filament 3 can be fully solidified.

The present invention has the above-mentioned characteristic features such as "giving the surface of the exposed portion of the elastic filament a roughness due to the unevenness of the elastic filament itself" and "adhering a fine material to the surface of the exposed portion of the elastic filament". By adopting such a structure, problems such as blocking caused by the exposed portions of the elastic filaments can be effectively prevented, but an antiblocking agent may be used in combination.
As an example of the method of using the anti-blocking agent, in the above-described method for manufacturing the stretchable sheet 1, after the composite nonwoven fabric manufacturing step and the surface roughness imparting step and before the stretching step, the surface on which the elastic filaments 3 are arranged in the composite nonwoven fabric 5 or A method of applying an antiblocking agent to the entire surface of the opposite side can be used. In such a method of use, the antiblocking agent is preferably applied by spraying.
As another example of the method of using the antiblocking agent, there is a method of incorporating fibers into which the antiblocking agent is kneaded into the raw nonwoven fabric 4 . Such fibers are obtained by kneading an anti-blocking agent into the constituent resin of the fibers.
When using an antiblocking agent in the production of the stretch sheet, the amount of the antiblocking agent used (the content of the antiblocking agent in the stretch sheet) is preferably 0.3 parts by weight or more based on 100 parts by weight of the raw nonwoven fabric. , more preferably 0.5 parts by weight or more, and preferably 2 parts by weight or less, more preferably 1.5 parts by weight or less.

As antiblocking agents, amide compounds, silicone compounds, modified silicone compounds, flon compounds, hydrocarbon compounds having side chains, mineral oils, waxes and the like can be used.
The amide compound includes a compound having a structure consisting of an amine and a carboxylic acid, or a polyamide compound. The amide compound may be either a compound having an amino group and a carbonyl group terminal left in the molecule or a compound blocked in the form of an amide group. Specifically, stearic acid amide, behenic acid amide, hexamethylenebisstearic acid amide, trimethylenebisoctylic acid amide, hexamethylenebishydroxystearic acid amide, trioctatrimellitic acid amide, distearyl urea, butylene bisstearic acid amides, xylylene bis stearamide, distearyl adipamide, distearyl phthalamide, distearyl octadecadeic acid amide, epsilon caprolactam, and derivatives thereof.
Examples of silicone compounds include dimethylsilicone, methylphenylsilicone, and methylhydrogelsilicone.
Modified silicone compounds include modified silicone polymers and silicone polymers. Among them, amino-modified silicone, diamino-modified silicone, polyether-modified silicone and the like can be mentioned. Amino-modified silicone or diamino-modified silicone is preferable from the viewpoint of further improving the touch.
Fluorocarbon compounds include fluorinated polymers such as polytetrafluoroethylene (PTFE) and polyvinylidene fluoride (PVDF).

Although the present invention has been described above based on its preferred embodiments, the present invention is not limited to the above embodiments, and can be modified as appropriate without departing from the scope of the present invention.

The following notes are further disclosed with respect to the above-described embodiments of the present invention.
<1>
A plurality of non-stretched elastic filaments arranged so as to extend in one direction without intersecting each other are joined by fusion to one surface of an extensible nonwoven fabric,
The absorbent article, wherein a portion of the elastic filament other than the portion fused to the nonwoven fabric is exposed, and the surface of the exposed portion of the elastic filament is provided with roughness due to unevenness of the elastic filament itself. Elastic sheet for
<2>
The elastic sheet for absorbent articles according to <1>, wherein the exposed portion of the elastic filaments has a roughening ratio of 10% or more.
<3>
The absorbent article according to <1> or <2> above, wherein the roughening ratio of the exposed portions of the elastic filaments is preferably 20% or more, preferably 75% or less, and more preferably 65% or less. Elastic sheet for
<4>
The stretch sheet for absorbent articles according to any one of <1> to <3>, wherein no adhesive is present between the nonwoven fabric and the elastic filaments.
<5>
The stretch sheet for absorbent articles according to any one of <1> to <4>, wherein the elastic filaments are fused to the nonwoven fabric over the entire longitudinal length of the elastic filaments.

<6>
The stretch sheet for absorbent articles according to any one of <1> to <5>, wherein a fine material is attached to the surface of the exposed portion of the elastic filaments.
<7>
The stretch sheet for absorbent articles according to <6>, wherein the fine material includes a material that does not melt or thermally decompose at 200°C.
<8>
The fine material comprises a fibrous fine material, and the average fiber length of the fibrous fine material is preferably 1 μm or more, more preferably 100 μm or more, and preferably 10 mm or less, more preferably 5 mm or less. The stretch sheet for absorbent articles according to <6> or <7>.
<9>
The stretchable sheet for absorbent articles according to any one of <6> to <8>, wherein the fine material contains cellulose fibers.
<10>
The fine material comprises a particulate fine material, and the average particle size of the particulate fine material is preferably 1 μm or more, more preferably 100 μm or more, and preferably 2 mm or less, more preferably 1 mm or less. The stretchable sheet for absorbent articles according to any one of <6> to <9>.
<11>
The adhesion area ratio of the fine material on the surface of the exposed portion of the elastic filament is preferably 1% or more, more preferably 3% or more, and preferably 20% or less, more preferably 10% or less. The stretchable sheet for absorbent articles according to any one of <6> to <10>.

<12>
A method for producing a stretch sheet for absorbent articles, wherein a plurality of non-stretched elastic filaments arranged to extend in one direction without intersecting each other are bonded to one surface of an extensible nonwoven fabric in an exposed state. There is
A plurality of molten or softened elastic filaments spun from a plurality of spinning nozzles are brought into contact with one surface of the raw nonwoven fabric before solidification of the elastic filaments, so that the elastic filaments are on one side of the raw nonwoven fabric. a composite nonwoven fabric manufacturing process for obtaining a composite nonwoven fabric fused while being exposed to the surface;
a surface roughness imparting step of forming unevenness on the non-contact portion itself with the original nonwoven fabric on the surface of the elastic filament;
and stretching the composite nonwoven fabric.
<13>
The method for producing a stretch sheet for an absorbent article according to <12> above, wherein in the composite nonwoven fabric production step, the elastic filaments and at least part of the constituent fibers of the original nonwoven fabric are fused.

<14>
In the composite nonwoven fabric manufacturing process, the raw nonwoven fabric is wound around one of a pair of rolls facing each other and supplied between the pair of rolls, and is spun from a plurality of spinning nozzles in a molten or softened state. A plurality of elastic filaments of are supplied between the original nonwoven fabric and the other of the pair of rolls,
A predetermined surface roughness is imparted to the peripheral surface of the other roll of the pair of rolls,
The stretchable absorbent article according to the above <12> or <13>, wherein in the surface roughness imparting step, the other roll peripheral surface is brought into contact with the non-contact portion of the elastic filament before the elastic filament is solidified. Sheet manufacturing method.
<15>
The above <14>, wherein the other roll (roll having a roll peripheral surface provided with a predetermined surface roughness) is a roll having a surface treatment that increases the frictional force on the roll peripheral surface. A method for producing a stretch sheet for absorbent articles.
<16>
The arithmetic mean roughness Ra of the other roll (the roll having a predetermined surface roughness on the peripheral surface of the roll) is preferably 5 μm or more, more preferably 10 μm or more, and preferably 50 μm or less, more preferably 30 μm. The method for producing a stretch sheet for absorbent articles according to <14> or <15>, which is the following.
<17>
Any one of <14> to <16>, wherein a roll having a fine material adhered to the roll peripheral surface is used as the other roll (roll having a peripheral surface having a predetermined surface roughness). Method for manufacturing a stretch sheet for absorbent articles.
<18>
The method for producing a stretch sheet for absorbent articles according to any one of <14> to <17>, wherein the peripheral surface of the other roll contains a material that does not melt or thermally decompose at 200°C.
<19>
The method for producing a stretch sheet for absorbent articles according to any one of <14> to <18>, wherein the peripheral surface of the other roll contains cellulose fibers.
<20>
<14>, wherein the other roll (roll having a roll peripheral surface provided with a predetermined surface roughness) is a cotton roll whose roll peripheral surface is made of cellulose fibers (a material that does not melt and thermally decompose at 200 ° C.). The method for producing a stretchable sheet for absorbent articles according to any one of <19>.
<21>
Production of the stretch sheet for absorbent articles according to <20> above, wherein the cotton roll preferably has a Shore D hardness (JIS K7215) of 75 to 85 degrees, more preferably 77 to 83 degrees. Method.

<22>
A method for producing a stretch sheet for absorbent articles, wherein a plurality of non-stretched elastic filaments arranged to extend in one direction without intersecting each other are bonded to one surface of an extensible nonwoven fabric in an exposed state. There is
A plurality of molten or softened elastic filaments spun from a plurality of spinning nozzles are brought into contact with one surface of the raw nonwoven fabric before solidification of the elastic filaments, so that the elastic filaments are on one side of the raw nonwoven fabric. A composite nonwoven fabric fused to the surface is obtained, and a release sheet is brought into contact with the non-contact portion of the surface of the elastic filament with the original nonwoven fabric so that the elastic filament is formed between the original nonwoven fabric and the release sheet. obtaining an interposed laminate sheet;
removing the release sheet from the laminated sheet;
and stretching the composite nonwoven fabric,
The method for producing a stretch sheet for absorbent articles, wherein the release sheet is mainly made of a material that does not melt or thermally decompose at 200°C.
<23>
The basis weight of the release sheet is preferably 9 g/m ² or more, more preferably 12 g/m ² or more, and preferably 100 g/m ² or less, more preferably 70 g/m ² or less. <22> The method for producing the stretch sheet for absorbent articles according to 1.
<24>
The above <22> or <23>, wherein the step of removing the release sheet from the laminated sheet is after the elastic filaments, which were in a molten or softened state when the release sheet was brought into contact, are cooled and solidified. Method for manufacturing a stretch sheet for absorbent articles.
<25>
The peel strength between the surface of the composite nonwoven fabric on which the elastic filaments are arranged and the release sheet is preferably 0.19 N/25 mm or less, more preferably 0.1 N/25 mm or less, and preferably 0.005 N/25 mm or more. The method for producing a stretch sheet for absorbent articles according to any one of <22> to <24>.

<26>
The method for producing a stretch sheet for absorbent articles according to any one of <14> to <25> above, which uses an antiblocking agent.
<27>
The amount of the antiblocking agent used (the content of the antiblocking agent in the elastic sheet) is preferably 0.3 parts by weight or more, more preferably 0.5 parts by weight, based on 100 parts by weight of the original nonwoven fabric. The method for producing a stretch sheet for absorbent articles according to <26> above, and preferably 2 parts by weight or less, more preferably 1.5 parts by weight or less.
<28>
The method for producing a stretchable sheet for absorbent articles according to <26> or <27> above, wherein one or more selected from an amide compound, a silicone compound and a modified silicone compound is used as the antiblocking agent.

EXAMPLES Hereinafter, the present invention will be described in more detail with reference to Examples, but the present invention is not limited to such Examples.

[Examples 1 to 5, Comparative Examples 1 to 3: Production of stretch sheets with exposed elastic filaments]
First, a laminated sheet 7, which is an intermediate product of the elastic sheet 1 shown in FIG. , i.e., an unstretched composite nonwoven fabric and a release sheet fused to the surface on which the elastic filaments are arranged in the composite nonwoven fabric, and the composite nonwoven fabric is crossed with each other on one side of the nonwoven fabric A plurality of unstretched elastic filaments arranged to extend in one direction without stretching were fused together in an exposed state.
Specifically, the raw material resin of the elastic filaments is spun from a spinning nozzle in a molten state, and as shown in FIG. is fused to one surface of the raw nonwoven fabric, and a release sheet is brought into contact with the non-contact portion of the surface of the elastic filament with the raw nonwoven fabric, and the raw nonwoven fabric and the release sheet A laminate sheet in which the elastic filaments were interposed between was obtained (laminate sheet manufacturing process). However, in the laminated sheet manufacturing process, the original nonwoven fabric was wound around the first roll 12 and the release sheet was wound around the second roll 13, contrary to the mode shown in FIG. The resin discharge speed in the spinning nozzle was 10 g/min, and the take-up speed of the elastic filament by the pair of rolls 12 and 13 was 150 m/min. The distance between adjacent elastic filaments in the obtained composite nonwoven fabric was 0.5 mm.
Next, the release sheet was removed from the laminated sheet obtained in each example and comparative example to obtain a composite nonwoven fabric, and the composite nonwoven fabric was stretched in the MD using a stretching device having the same configuration as the stretching device 30 described above. Thus, a stretch sheet having MD stretchability was obtained.

Styrene-ethylene-propylene-styrene (SEPS) was used as the raw material resin of the elastic filament. Any one of the following was used as the raw nonwoven fabric and the release sheet. None of the following uses an anti-blocking agent.
・SB nonwoven fabric 1: Hydrophobic spunbond nonwoven fabric, basis weight 18 g/m ² , raw material resin: polypropylene (melting point 140 to 170°C), fiber diameter 17 μm
・SB nonwoven fabric 2: hydrophilic spunbond nonwoven fabric, basis weight 18 g/m ² , raw material resin: polypropylene (melting point 140 to 170°C), fiber diameter 17 μm
・AT nonwoven fabric: hydrophilic air-through nonwoven fabric, basis weight 20 g/m ² , core material resin: PET, sheath material resin: polyethylene (melting point 130°C), fiber diameter 16 μm
・Paper: Basis weight 16 g/m ² , cellulose fiber (wood pulp) 100% by mass
・ Resin-blended paper: Basis weight 15 g/m ² , cellulose fiber (wood pulp) 90% by mass, synthetic fiber (core resin: PET, sheath raw material resin: low-melting PET (melting point 120 ° C.) Hydrophilized core-sheath type composite fiber) 10% by mass

[Comparative Examples 4 and 5: Production of stretch sheet with non-exposed elastic filaments]
Elastic filaments are interposed and arranged between two nonwoven fabrics in the same manner as in the above-described method for producing a stretch sheet with exposed elastic filaments, except that the original nonwoven fabric is used instead of the release sheet. A stretch sheet having no exposed elastic filaments was produced.

〔Evaluation test〕
Regarding the elastic filament-exposed type stretch sheet, the peel strength when the release sheet was removed from the laminated sheet, which was the intermediate product of each example and comparative example, was measured by the method described above. In addition, the surface roughness of the exposed portions of the elastic filaments in the stretch sheets of the elastic filament exposed type obtained in each of the Examples and Comparative Examples was measured by the method described above, and the surface of the exposed portions was observed. The presence or absence of unevenness and the presence or absence of adhesion of fine materials derived from the release sheet were checked. In addition, the airflow resistance of the stretch sheets obtained in each example and comparative example was measured by the following method. The results are shown in Table 1 below.

<Method for measuring ventilation resistance>
This measurement method can be carried out using a permeability tester "KES-F8-AP1 AIR PERMEABILITY TESTER" (trade name) manufactured by Kato Tech Co., Ltd. Specifically, the sheet to be measured is stretched to give the maximum elongation in the stretching direction, and the ventilation resistance is measured at any 12 points on the sheet in the stretched state according to a conventional method using the air permeability tester. The air resistance of the sheet is defined as the arithmetic mean of the measurements. The "maximum elongation" basically means an elongation of 100% of the sheet. means degrees. The higher the value of the degree of airflow resistance, the higher the airflow resistance of the sheet and the lower the air permeability.

As shown in Table 1, in each example, the release sheet used was mainly composed of a material (cellulose fiber) that does not melt or thermally decompose at 200°C. The peel strength was smaller than that of , and the release sheet could be smoothly peeled off from the laminated sheet. In addition, in the stretch sheets obtained in each example, the surface of the exposed portion of the elastic filaments is provided with irregularities of the elastic filaments themselves, and fine materials (cellulose fibers) derived from the release sheet are adhered. , It is clear that the blocking resistance and storage stability are excellent because a certain level or more of surface roughness is imparted.
In Comparative Examples 2 and 3, due to the relatively high content of low-melting-point materials (for example, materials having a melting point of less than 200°C, preferably 170°C or less) in the release sheet, the total mass of the low-melting-point materials It is presumed that the release sheet could not be peeled off from the laminated sheet because the ratio of the elastic filaments and the heat-sealed material (heat-sealed ratio) was too high. Considering the results of this time, it can be said that the content of the low melting point material in the release sheet is preferably 10% by mass or less with respect to the total mass of the release sheet. As the release sheet, it can be said that paper mainly composed of cellulose fibers and resin-blended paper having a resin content of 10% by mass or less are more preferable than nonwoven fabrics mainly composed of synthetic fibers.
Further, from the comparison between Example 2 and Comparative Example 4, and between Examples 3 and 5 and Comparative Example 5 (comparison between the same types of nonwoven fabrics), it was found that the number of nonwoven fabrics was one and the elastic filament exposed type. It is clear that the stretch sheet has a lower air resistance and is superior in breathability, compared to the non-exposed elastic filament type stretch sheet with two nonwoven fabrics.

1 Elastic sheet 2 Nonwoven fabric 21 Low basis weight part 22 High basis weight part 3 Elastic filament 4 Original fabric nonwoven fabric 5 Composite nonwoven fabric 5R Composite nonwoven fabric roll 6 Release sheet 7 Laminated sheet 10 Spinning device 11 Spinning head 11a Spinning nozzles 12, 12A First roll 13, 13A Second roll 14 Third roll 30 Stretching devices 31a, 31b Tooth groove rolls 32 Roll support shafts 33a, 33b Infeed rolls 34a, 34b Outfeed rolls

Claims (10)

A plurality of non-stretched elastic filaments arranged so as to extend in one direction without intersecting each other are joined by fusion to one surface of an extensible nonwoven fabric,
The absorbent article, wherein a portion of the elastic filament other than the portion fused to the nonwoven fabric is exposed, and the surface of the exposed portion of the elastic filament is provided with roughness due to unevenness of the elastic filament itself. Elastic sheet for 2. The stretchable sheet for absorbent articles according to claim 1, wherein the exposed portion of the elastic filaments has a roughening ratio of 10% or more. 3. The stretchable sheet for absorbent articles according to claim 1, wherein a fine material adheres to the surface of the exposed portion of the elastic filament. The stretch sheet for absorbent articles according to claim 3, wherein the fine material includes a material that does not melt and thermally decompose at 200°C. The stretch sheet for absorbent articles according to claim 3 or 4, wherein the fine material contains cellulose fibers. A method for producing a stretch sheet for absorbent articles, wherein a plurality of non-stretched elastic filaments arranged to extend in one direction without intersecting each other are bonded to one surface of an extensible nonwoven fabric in an exposed state. There is
A plurality of molten or softened elastic filaments spun from a plurality of spinning nozzles are brought into contact with one surface of the raw nonwoven fabric before solidification of the elastic filaments, so that the elastic filaments are on one side of the raw nonwoven fabric. a composite nonwoven fabric manufacturing process for obtaining a composite nonwoven fabric fused while being exposed to the surface;
a surface roughness imparting step of forming unevenness on the non-contact portion itself with the original nonwoven fabric on the surface of the elastic filament;
and stretching the composite nonwoven fabric. In the composite nonwoven fabric manufacturing process, the raw nonwoven fabric is wound around one of a pair of rolls facing each other and supplied between the pair of rolls, and is spun from a plurality of spinning nozzles in a molten or softened state. A plurality of elastic filaments of are supplied between the original nonwoven fabric and the other of the pair of rolls,
A predetermined surface roughness is imparted to the peripheral surface of the other roll of the pair of rolls,
7. The method for producing a stretchable sheet for absorbent articles according to claim 6, wherein in said surface roughening step, said non-contact portion of said elastic filament is brought into contact with said other roll peripheral surface before said elastic filament is solidified. The method for producing a stretch sheet for absorbent articles according to claim 7, wherein the peripheral surface of the other roll contains a material that does not melt or thermally decompose at 200°C. The method for producing a stretch sheet for absorbent articles according to claim 7 or 8, wherein the peripheral surface of the other roll contains cellulose fibers. A method for producing a stretch sheet for absorbent articles, wherein a plurality of non-stretched elastic filaments arranged to extend in one direction without intersecting each other are bonded to one surface of an extensible nonwoven fabric in an exposed state. There is
A plurality of molten or softened elastic filaments spun from a plurality of spinning nozzles are brought into contact with one surface of the raw nonwoven fabric before solidification of the elastic filaments, so that the elastic filaments are on one side of the raw nonwoven fabric. A composite nonwoven fabric fused to the surface is obtained, and a release sheet is brought into contact with the non-contact portion of the surface of the elastic filament with the original nonwoven fabric so that the elastic filament is formed between the original nonwoven fabric and the release sheet. obtaining an interposed laminate sheet;
removing the release sheet from the laminated sheet;
and stretching the composite nonwoven fabric,
The method for producing a stretch sheet for absorbent articles, wherein the release sheet is mainly made of a material that does not melt or thermally decompose at 200°C.

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