JP2000248431A - Composite short fiber and method for producing stretchable nonwoven fabric using the same - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To solve the problem that conventional nonwoven fabrics substantially composed of a thermoplastic elastomer cannot achieve both high bulkiness and elasticity. SOLUTION: A thermoplastic elastomer (EL) and a hot water-soluble thermoplastic polyvinyl alcohol-based polymer (PV)
A) the use of a composite staple fiber comprising at least 50% of the fiber surface and having an apparent crimp;
And after dissolving and removing PVA from the web in a state where the composite short fiber group is formed into a web through a card, EL
To locally form a fixing point where short fibers are fixed to each other.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a conjugate short fiber comprising a thermoplastic elastomer as a component and a method for producing a stretchable nonwoven fabric using the same, and more particularly, to a nonwoven fabric having high bulkiness and stretchability. The present invention relates to a conjugate short fiber suitable for obtaining and a method for producing an elastic nonwoven fabric using the conjugate short fiber. Here, the conjugate short fiber refers to a short fiber-shaped conjugate fiber composed of at least two kinds of polymers.

[0002]

2. Description of the Related Art Conventionally, non-woven fabrics exhibiting a high degree of elasticity have been desired for applications such as pulp materials and diapers. Therefore, fibers made of a thermoplastic elastomer having rubber-like elasticity are frequently used as raw cotton of the nonwoven fabric. For example, JP-A-57-95362 and JP-A-57-82553 disclose a method in which a thermoplastic elastomer is formed into a web state by a melt blow method or a spun bond method, and is then subjected to a fusion treatment to obtain a fiber. A method has been proposed in which connection points are formed while being scattered.

However, the nonwoven fabric obtained by these methods has a nonwoven fabric structure in which crimp-free fibers are deposited in a straight shape, that is, a two-dimensionally arranged nonwoven fabric. You can only get such a texture. Moreover, as shown in FIG. 1, the strength and elongation characteristics show that even a nonwoven fabric of a general standard (a basis weight of 200 g / m ² , a thickness of 0.78 mm, a density of 0.32 g / cm ³ and a width of 2 cm) has a small force. Then, it was difficult to stretch and could not withstand large deformation.

[0004] Japanese Patent Application Laid-Open No. 6-272111 also proposes a method in which a conjugate short fiber obtained by combining two types of elastomers having different melting points is used as raw cotton. In this method, anisotropic crimping occurs due to a difference in the physical properties of the polymer in the conjugate short fiber itself, so that the two-dimensional arrangement seen in the above-described melt blow method can be avoided. That is, since the obtained nonwoven fabric tends to have a three-dimensional arrangement, it is somewhat bulky. However, in this method, when cutting into conjugate short fibers, the raw yarn is easily stretched, so that it is difficult to cut, and the cut length becomes uneven. Furthermore, in the carding process, the characteristic of the composite staple fiber that is easy to elongate causes an obstacle that the staple fiber bites into the card wire and does not come off,
There is a problem that the process passability is extremely poor.

Accordingly, the present inventors have previously described Japanese Patent Application Laid-Open No. 9-3
No. 1751, a thermoplastic elastomer and a low-melting non-elastomer having a melting point lower than that of the thermoplastic elastomer by 30 ° C. or more, the latter comprising 50% of the fiber surface
A composite short fiber occupying the above is proposed.

According to the composite staple fiber, the non-elastomer is used to impart an apparent non-stretch property to the composite staple fiber itself. The problem of poor sex is eliminated. Moreover, the fact that the composite staple fiber is apparently non-stretchable makes it possible to apply indentation crimping that gives a strong crimp to the staple fiber, and further, compared to the conjugate staple fiber having only the above-described anisotropic crimp, Since it is possible to obtain a conjugate short fiber having a high crimp, the bulkiness of the obtained nonwoven fabric can be further promoted.

However, if the conjugate short fiber itself is made non-stretchable by the combined use of a non-elastomer, there may be doubt that the stretchability of the obtained nonwoven fabric may be impaired. However, regarding this point, when forming a fixing point for fixing the elastomer short fibers, the melted low-melting non-elastomer moves on the surface of the elastomer short fibers and concentrates at the intersection of the short fibers. It was considered that the low-melting-point non-elastomer did not remain on the surface of the elastomeric short fibers except for the above point, and therefore, the elastic properties of the elastomer were exhibited as it was.

[0008] However, during repeated actual tests, it was confirmed that the movement of the melted low-melting-point non-elastomer did not proceed as expected and hindered the elastic properties of the elastomer.

[0009]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to solve the problem that conventional nonwoven fabrics substantially made of thermoplastic elastomer cannot achieve both high bulkiness and elasticity. It is in. Another object of the present invention is to provide a short fiber comprising a conventional thermoplastic elastomer as a component,
An object of the present invention is to solve the problem that high bulkiness and elasticity obtained therefrom cannot be achieved at the same time. Further, another problem of the present invention is that the conventional nonwoven fabric production method using short fibers made of a thermoplastic elastomer as raw cotton could not simultaneously impart high bulkiness and elasticity to the obtained nonwoven fabric. Is to solve.

[0010]

Means for Solving the Problems As a result of diligent studies of the above-mentioned problems, the present inventors have found that the short staple fiber in the raw yarn stage has an apparently (temporarily) inelasticity as one component of the staple fiber.
In addition, the inventor has conceived of using a hot water-soluble non-elastomer which can impart indentation crimp. As a result, it has been found that a desired three-dimensional fiber arrangement is ensured on the web, and thereafter, if the non-elastomer is removed, a stretchable nonwoven fabric having both high bulkiness and stretchability can be obtained.

Thus, according to the present invention, there is provided a conjugate short fiber comprising a thermoplastic elastomer (EL) and a hot water-soluble thermoplastic polyvinyl alcohol-based polymer (PVA), the latter comprising at least 50% of the fiber surface. In addition, the present invention provides a conjugate short fiber, wherein the fiber is provided with an apparent crimp.

Further, in the present invention, the composite staple fibers comprising EL and PVA, the latter occupying at least 50% of the fiber surface and having an apparent crimp, are formed into a web by passing through a card. After the PVA is dissolved and removed from the web, there is also provided a method for producing a stretchable nonwoven fabric, wherein fixing points where EL short fibers are fixed to each other are locally formed.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION The requirements for the composite staple fiber of the present invention are that the polymer to be combined with EL is a thermoplastic polyvinyl alcohol (PVA) which is soluble in hot water, and the other is that the surface of the composite staple fiber is coated with PVA. At least 50% and the entire composite staple fiber has crimps.

The former requirement is particularly important. By forming a polymer having a desired three-dimensional arrangement by forming a polymer to be combined with EL into PVA, the PVA is easily dissolved and removed with hot water or the like. It becomes possible. Regarding the latter requirement, as in the case of the conventional low-melting thermoplastic non-elastomer, from the viewpoint of ensuring stable processability of the conjugate staple fiber, the surface of the conjugate staple fiber has PVA of at least 50%.
% In order to obtain a web in which the composite short fibers are three-dimensionally arranged, it is necessary that the entire composite short fibers have an apparent crimp.

Hereinafter, the PV constituting the conjugate short fiber of the present invention will be described.
A will be described. From the above, PVA is E
L can be coated as long as it can coat the surface of L and is at least soluble in boiling water.
Those which are soluble in warm water of not less than ° C are preferred. Specific PVA
The melting point is preferably in the range of 150 to 220 ° C., from the viewpoints of thermal stability and fiber forming properties in performing melt composite spinning with EL, and the solubility of PVA itself in hot water.
The viscosity average degree of polymerization is preferably from 50 to 1500. As the composition of the PVA, a partially saponified PVA partially containing a vinyl acetate polymer is preferable in view of its solubility in hot water, and a saponification degree in the range of 20 to 95% is particularly preferable.

In order to adjust the spinning stability and melt viscosity of the PVA itself, an olefin polymer, glycerin, glycols or the like may be copolymerized or added as necessary, or modified with sulfonic acid or acetoacetyl. Group modification may be performed. Of course, in PVA, 30
If it is within wt%, various stabilizers, ultraviolet absorbers, thickening and branching agents, matting agents, coloring agents and other various functional agents may be copolymerized or added.

Next, other requirements constituting the conjugate short fiber of the present invention will be described. The thermoplastic elastomer in the conjugate short fiber of the present invention is not particularly limited as long as it is a polymer that can be melt-spun and has high elongation and good elongation elasticity recovery properties. For example, it is described in the above-mentioned JP-A-9-31751. Any of the above-mentioned polyurethane-based elastomers and polyester-based elastomers having a polyether unit as a soft component can be arbitrarily employed, and any polyester-based elastomer in which both the hard component and the soft component are polyester may be used. In particular, a polyester elastomer having excellent heat stability is preferable, and a polyester elastomer having a polyester unit as a hard component and a polyether unit as a soft component is particularly preferable.

Regarding the composite ratio of EL and PVA, it is preferable to reduce the ratio of PVA in order to easily dissolve and remove PVA in hot water.
The range of 97: 3 is preferable, and in consideration of giving a high degree of indentation crimp to the conjugate staple fiber, 65: 35-9.
A range of 0:10 is more preferred.

The cross-sectional form of the conjugate short fiber may be a side-by-side type or a sea core (core-sheath) type. In the case of the core-sheath type, the concentric type or the eccentric type may be used, but the eccentric type is preferable because a fine spiral crimp by heat treatment can be added. Of course, the cross section of these composite short fibers is
It may be not only circular but also irregular, solid or hollow. Rather, making the cross section of the conjugate short fiber irregular or hollow is a preferable embodiment because the bulkiness of the nonwoven fabric can be improved. As for the EL component, two or more ELs having different compositions may be used in combination.

The fineness of the conjugate short fiber can be arbitrarily changed depending on the use, and is not particularly limited as long as it can pass through the card. However, in general, the range of 0.5 to 300 denier is preferable from the viewpoint of productivity.
The cut length of the conjugate short fiber is not particularly limited as long as the card passability is maintained, but is generally preferably in the range of 25 mm to 250 mm.

Regarding the number of crimps and the degree of crimp of the conjugate short fiber,
It is preferable that the obtained nonwoven fabric is high in view of bulkiness and the like. However, if it is too high, there is a problem that a nep is easily generated in a card. Therefore, the number of crimps is 8 to 30 / inch, and the degree of crimp is Is preferably in the range of 15 to 40%.

When producing such a conjugate short fiber of the present invention, for example, a core-sheath type conjugate short fiber is melt-spun using a known conjugate fiber spinning apparatus, and the obtained undrawn yarn is obtained. It is obtained by performing drawing, tension heat treatment and / or relaxation heat treatment as necessary, then performing indentation crimping, and cutting into a desired fiber length.

Next, a method for producing a stretchable nonwoven fabric according to another embodiment of the present invention will be described. The requirements for the method for producing a stretchable nonwoven fabric of the present invention are as follows: after obtaining a web exhibiting a three-dimensional fiber arrangement from a group of composite short fibers having EL as a component and having crimp, the surface of the composite short fibers is The purpose is to dissolve and remove existing PVA. This is the biggest feature of the present invention,
Up to the point of forming a web composed of composite staple fibers,
The non-stretch property of the composite staple fiber, which is indispensable for the card passing property and the formation of the three-dimensional arrangement of the composite staple fiber, is ensured by PVA, and thereafter, the stretch property of the EL staple fiber itself is enhanced by removing the PVA. It is. This means that prior to dissolution removal P
It can also be said that the use of apparent crimp in combination with VA is used.

Hereinafter, the method for producing a stretchable nonwoven fabric of the present invention will be described in detail. The web of the composite staple fibers of the present invention may be formed by any method as long as the composite staple fibers can be arranged in a three-dimensional array. Generally, the composite staple fibers are webbed with a card. . At this time, in order to further promote the three-dimensional arrangement, it is preferable that the web be subjected to a confounding treatment such as a needle punch or a water needle.

The PVA may be dissolved or removed before or after the formation of the fixing points for fixing the EL short fibers as long as the composite short fibers are arranged three-dimensionally. In order to obtain a point, it is preferable before the formation of the fixing point. At this time, the bulkiness of the web from which PVA has been dissolved and removed before the formation of the fixing point is maintained at least 80% as compared with before the dissolution and removal, probably because of the large friction between the fibers specific to EL short fibers.

For dissolving and removing PVA, the PV
The web in which the composite short fibers are three-dimensionally arranged may be immersed in hot or hot water at a temperature at which A is dissolved.
The temperature of warm water or hot water is preferably 50 ° C. or higher, more preferably 80 ° C. or higher, in order to promote dissolution and removal. At this time, it is preferable to immerse the web in warm water in a relaxed state, rather than in a tension state, because the reduction in bulkiness of the web due to PVA dissolution and removal is small. Thus, the PV
The web from which A has been removed is subjected to an optional drying treatment. As a preferable drying treatment, a hot air method is preferable because the bulkiness of the web after PVA dissolution removal is easily increased.

The web from which the PVA has been removed is fixed at the intersection of the EL short fibers so as to form a fixing point so as to withstand even greater deformation. The crossover here is
This means both a crossing portion where the EL short fibers are entangled by the pre-entanglement and a crossing portion where the EL short fibers are simply in contact with each other. Of course, if the conjugate short fibers are sufficiently entangled by the above-mentioned entanglement treatment and the web after dissolving and removing the PVA can withstand large deformation, it is not necessary to form a fixing point. For the method of forming the fixing point,
A method in which EL short fibers are locally fixed to each other with a binder resin, a method in which EL short fibers are partially fused with each other by an emboss calender, or fibers or particles made of a resin having a melting point lower than the melting point of EL in a nonwoven fabric. And mixing the EL short fibers by fusing the low melting point polymer. Further, as the resin for forming the fixing point in the nonwoven fabric, a resin having a high degree of elasticity itself is preferable, and examples thereof include polyurethane-based and polyester-based elastomers. Of course, various raw cottons may be mixed as long as the elasticity of the nonwoven fabric after dissolving and removing the PVA is not impaired.

The nonwoven fabric thus obtained has a high bulkiness, and the original stretchability of the EL short fiber itself is completely exhibited. In addition, the nonwoven fabric has a high bulkiness and thus has added value such as heat retention and soft feeling, and also has a high degree of elasticity exhibited by deformation of the nonwoven fabric structure.

[0029]

The present invention will be described in detail with reference to the following examples. In addition, each evaluation item in an Example followed the following method, respectively.

[Number of crimps and degree of crimp] JIS L-1015 [Hardness and density of cushion material] JIS K-640
1 [Compression residual strain] JIS K-6401 [80,000 times compression residual strain] JIS K-6401 [Melting point] Measured at a heating rate of 20 ° C./min using a differential thermal analyzer 990 manufactured by DuPont. The peak was determined. If the melting temperature is not clearly observed, use a trace melting point measuring device (manufactured by Yanagimoto Seisakusho), sandwich about 3 g of the polymer between two cover glasses, and raise the temperature at a rate of 20 ° C./min while gently pressing with tweezers. And observe the thermal change of the polymer. In this case, the temperature at which the polymer softens and starts to flow (softening point) is defined as the melting point here. [Viscosity average degree of polymerization of polyvinyl alcohol-based polymer]
JIS K 6726 [Bulkiness of web] JIS L-1097 [Residual strain at 50% elongation elastic recovery] Width 5 cm, length 20
cm of non-woven fabric sample with a nip length of 10 cm.
Stretch to 15 cm at 0 cm / min, then return at the same speed. After performing this operation 10 times, the device was allowed to stand for 30 minutes, and the strain was determined from the loose length.

Example 1 Terephthalic acid, butylene glycol and polytetramethylene glycol (molecular weight: 200
0) to obtain a block copolymerized polyetherester elastomer having an intrinsic viscosity of 1.5, comprising 38% by weight of a polybutylene terephthalate segment and 62% by weight of a polytetramethylene glycol segment, and formed into chips according to a conventional method. . The melting point of this EL was 190 ° C.
The elongation at break of the film made of this thermoplastic elastomer was 560%. The 300% elongation elastic recovery was 92%.

On the other hand, a polyvinyl alcohol polymer (NK-05, manufactured by Nippon Gosei Co., Ltd.) having a polymerization degree of about 600 and a melting point of 170 ° C. was used as PVA after drying at a drying temperature of 100 ° C. for 3 hours. With the thermoplastic polyester elastomer as a core and the above-mentioned polyvinyl alcohol-based polymer as a sheath, an eccentric core-sheath type composite fiber having a core in the center of the fiber cross-section such that the core / sheath ratio becomes 80/20 is taken off. 800
After winding at m / min, the fiber was drawn twice.
Further, the composite fiber was additionally applied with a press crimp and an oil agent, and then cut into short fibers to obtain a composite short fiber having a spiral crimp in addition to the press crimp. The obtained conjugate short fibers had a round cross section of a fineness of 40 denier, a cut length of 64 mm, a crimp number CN of 8 / inch,
It had a crimp degree CD of 20% and a uniform cut length.

This composite staple fiber group was formed into a web by using a card. However, there was no particular problem, and the staple fiber had good processability. Thereafter, the web was subjected to a fiber entanglement treatment by a weak needle punch of about 60 punches / cm ² with a 9 barb needle. Next, the web was immersed in hot water at 60 ° C. to dissolve and remove the PVA on the surfaces of the conjugate short fibers, and then washed with hot water. Thereafter, a urethane-based emulsion was sprayed onto the web so that the solid content was 30 wt% with respect to the EL short fibers, and the web was dried to obtain a nonwoven fabric. The obtained nonwoven fabric (with a basis weight of 220 g /
m ² , thickness 3.3 mm) is 0.067 g / cm 3
It was bulky and showed a soft touch.

FIG. 1 shows the strength and elongation (width 2 cm) of the nonwoven fabric. From FIG. 1, it can be seen that in the initial stage of elongation, the elastic non-woven fabric exhibits elasticity due to the deformation of the non-woven fabric, and is easily stretched by a very weak force. However, it is easily understood that a relatively high force is required for stretching, and that the breaking elongation is very high and can cope with large deformation. In addition, the nonwoven fabric has no residual PVA on the surface of the EL short fiber and has a residual strain of 2% after 50% elongation. Was something.

[Example 2] Polypropylene polymer was P
Short composite fibers were obtained in the same manner as in Example 1, except that PVA component was used in an amount of 20 wt% based on the weight of VA. The spinnability of PVA was improved by mixing the polypropylene polymer, and the spinning condition was very good. The resulting fiber has a round cross section with a fineness of 35 denier and a cut length of 64.
mm, number of crimps CN: 9 / inch, degree of crimp CD: 23%
Met.

The composite staple fiber was finished into an elastic nonwoven fabric by repeating the same operation as in Example 1. In this case, the step of cutting into short fibers and the step of carding also had no problem as in Example 1, and had good processability. The resulting nonwoven fabric (having a basis weight of 205 g / m ² and a thickness of 3.2 mm) had a bulkiness of 0.064 g / cm ³ and exhibited a soft touch. The obtained stretchable nonwoven fabric was treated with E as in Example 1.
The PVA did not remain on the surface of the L short fiber, and had excellent stretchability. The residual strain after 50% elongation was 2%, and it was extremely difficult to leave a strain.

Example 3 Composite short fibers were obtained in the same manner as in Example 1 except that PVA was changed to Ecomaty AX manufactured by Nippon Gosei Co., Ltd., having a degree of polymerization of 450 and a melting point of 199 ° C. The spinning condition is good, and the obtained conjugate short fiber has a round cross section and a fineness of 6
0 denier, cut length 64mm, crimp number CN 7 /
Inch and crimp degree CD were 18%.

By repeating the same operation as in Example 1, this conjugate short fiber was finished into a stretchable nonwoven fabric. In this case, the step of cutting into short fibers and the step of carding also had no problem as in Example 1, and had good processability. The density of the obtained nonwoven fabric (basis weight: 200 g / m ² , thickness: 3.4 mm) was 0.059 g / cm ^3, which was bulky and soft. The obtained stretchable nonwoven fabric was treated with E as in Example 1.
The PVA did not remain on the surface of the L short fiber, and had excellent stretchability. The residual strain after 50% elongation was 4%, and it was very difficult to leave a strain.

Example 4 The denier of the composite staple fiber was 30.
The same operation as in Example 1 was repeated except that the denier was changed to 0 denier. The obtained conjugate short fiber has a fiber length of 250 mm,
The number of crimps CN was 6 pieces / inch, and the degree of crimp CD was 25%. After opening the short fibers with a card to form a three-dimensional short fiber array, the PVA is dissolved and removed by hot water treatment.
It was dried with hot air. In this case, the step of cutting into short fibers and the step of carding were also performed without any particular problem as in Example 1.
Good process passability. The dried web was sprayed with a urethane emulsion so that the solid content was 20 wt%, and then packed in a chair-shaped mold and subjected to a drying treatment. The density of the cushion material thus obtained was 0.06.
It was 0 g / cm ³ . The cushion material thus obtained has good cushioning properties, and P is applied to the EL short fiber surface in the same manner as in Example 1.
VA did not remain. A part of the cushion material was cut out and measured. As a result, the residual strain was 18% and the residual strain after compression 80,000 times was 5%.

COMPARATIVE EXAMPLE 1 Instead of PVA, an acidic component in which terephthalic acid and isophthalic acid were mixed at a ratio of 60/40 (mol%), and ethylene glycol and diethylene glycol were mixed at a ratio of 85/15 (mol%). Except that the copolyester (low-melting thermoplastic non-elastomer) having a softening point of 110 ° C obtained from the diol component was used, and the entire process after webbing was changed to a heat bonding treatment at 170 ° C with dry heat for 5 minutes. By repeating the same operation as in Example 1, a non-woven fabric was finished. In this case, the step of cutting into short fibers and the step of carding were also performed without any particular problem as in Example 1.
Good process passability. The obtained nonwoven fabric (basis weight 23
0 g / m ² , thickness 3.4 mm) has a density of 0.068 g / m ² .
cm ^3, which was bulky and soft. However, the low-melting-point thermoplastic non-elastomer still remains on the surface of the EL other than at the bonding point, and the strong elongation (width 2 cm) of the obtained nonwoven fabric is shown in FIG. As compared with, the resistance at the initial elongation was higher and the elongation at break was slightly lower.

[Comparative Example 2] The composite staple fiber was prepared by mixing EL alone with 45
Processing was performed in the same manner as in Example 1 except that denier was changed. However, fusion was apt to occur, and it was difficult to impart crimping by a press crimper. Then, as an alternative method, a gear crimping machine was used, but remarkable fusion occurred, and it was again difficult to apply crimp. Although a small amount of the fiber obtained here was put on a card, it was found that the fiber was sunk into the wire, making it difficult to form a web.

[Comparative Example 3] The same treatment as in Example 1 was carried out except that EL and PVA were laminated in a side-by-side manner, and the ratio of PVA to the fiber surface was changed to 42%.
Fusing easily occurred in the process, and troubles such as dragging occurred. Here, a small amount of the obtained fiber (the single fiber fineness is 45 denier, the fiber length is 64 mm, the number of crimps is 10 / inch,
An attempt was made to form a web with a card having a crimp degree of 19%). However, the web was not obtained due to the bite of the card into the wire or the occurrence of many neps.

[0043]

According to the present invention, the non-stretching and non-stretching of the composite staple fiber, which is indispensable for the card passing property and the formation of the three-dimensional fiber arrangement of the composite staple fiber, until the web of the composite staple fiber group is formed. Property is ensured by PVA, and then P
By removing VA, the final product, nonwoven fabric,
The elasticity of the L short fiber itself can be highly exhibited.

Therefore, according to the present invention, a stretchable nonwoven fabric which achieves both high bulkiness and stretchability of the EL short fiber itself, which cannot be achieved by the conventional short fiber containing EL alone, can be obtained. . Moreover, the nonwoven fabric produced by the present invention can impart a high bulkiness, so that not only added value such as heat retention and soft texture can be added, but also the elasticity exhibited by deformation of the nonwoven fabric structure can be added. be able to.

[Brief description of the drawings]

BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a graph showing a drawing curve of a nonwoven fabric made of the heat-adhesive conjugate short fibers of the present invention (Example 1) and a conventional nonwoven fabric (nonwoven fabric by a melt blow method and nonwoven fabric of Comparative Example 1).

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Torukei Matsui 3-4-1, Amihara, Ibaraki-shi, Osaka Teijin Limited Osaka Research Center F-term (reference) 4L031 AA14 AA18 AB01 AB34 CA06 CA17 4L041 AA07 BA02 BA05 BA21 BA48 BA49 BA59 BA60 BC17 BD07 BD11 CA17 CA55 DD01 DD11 DD14 DD18 EE14 EE20 4L047 AA16 AA27 AA28 AB02 AB07 BA03 BA04 BA05 BA09 BB09 CB01 CB02 CB06 CC03 CC04

Claims (12)

[Claims] 1. A thermoplastic elastomer (EL) and a hot water-soluble thermoplastic polyvinyl alcohol-based polymer (PV)
A) a conjugated short fiber comprising the following (A), wherein the latter occupies at least 50% of the fiber surface, and the fiber has an apparent crimp. 2. The PVA has a viscosity average degree of polymerization of 50 to 15.
The conjugate short fiber according to claim 1, wherein the number is 00. 3. The conjugate short fiber according to claim 1, wherein EL is a polyester elastomer. 4. The composite short fiber according to claim 1, wherein the composite ratio of EL and PVA is in the range of 65:35 to 90:10 by weight. 5. A conjugate short fiber having a single fiber denier of 0.5
The method according to any one of claims 1 to 4, wherein the density is in the range of ~ 300 denier.
Item 12. The composite staple fiber according to the above item. 6. The conjugate short fiber according to claim 1, wherein the number of crimps is in a range of 8 to 30 per inch. 7. The conjugate short fiber according to claim 1, wherein the degree of crimp is in the range of 15 to 40%. 8. A composite staple fiber group comprising EL and PVA, wherein the latter occupies at least 50% of the fiber surface and has an apparent crimp, is brought into a web state, and the composite staple fiber constituting the web is After dissolving and removing PVA, E
A method for producing a stretchable nonwoven fabric, wherein a fixing point where L short fibers are fixed to each other is locally formed. 9. The PVA having a weight average degree of polymerization of 50 to 15
The method for producing a stretchable nonwoven fabric according to claim 8, which is 00. 10. The method of claim 1, wherein the dissolution of PVA is at least 50.
The method for producing a stretchable nonwoven fabric according to any one of claims 8 and 9, wherein the method is immersion treatment in warm water at ℃. 11. After the conjugate short fiber group is in a web state and before the PVA in the web is dissolved and removed,
The method for producing a stretchable nonwoven fabric according to any one of claims 8 to 10, wherein the web is subjected to a confounding treatment using a needle punch and / or a water needle. 12. The method for producing a stretchable nonwoven fabric according to claim 8, wherein the bonding treatment is bonding with a binder resin.