JP4195394B2 - Non-woven - Google Patents

Description

  TECHNICAL FIELD The present invention relates to a fabric formed by heat fusion at a contact portion between spun yarns, and includes a wiper, a nutrient water retention and transfer cloth during hydroponics, and a hygroscopic material such as a sanitary hygiene product such as a napkin. It relates to the material used as.

  Conventionally, as a configuration of a fabric due to a difference in manufacturing method, there have been a woven fabric made of a yarn consisting of a plurality of single yarns, a knitted fabric or a nonwoven fabric made of a single yarn directly, but a yarn consisting of a plurality of single yarns, for example, a spun yarn There was no non-woven fabric without knitting or knitting.

  Further, as a method of using a superabsorbent fiber as a spun yarn, for example, Patent Document 1 discloses a composite spun yarn including a hydrophobic fiber and a superabsorbent synthetic fiber, and the spun yarn as a whole is 100 parts by weight. When containing 3 to 30 parts by weight of the superabsorbent synthetic fiber and dividing the yarn cross section into a surface layer side and an inner layer side, the superabsorbent synthetic fiber is mainly located on the inner layer side. A composite spun yarn excellent in heat dissipation is shown.

  Patent Document 2 contains highly water-absorbing fibers having a fiber diameter at saturated water absorption of 10% or less of the fiber diameter when the water absorption is 5% or less, and pure water absorption of 2.0 times or more of its own weight. A high water-absorbing composite having both a water-absorbing factor of 1.5 times or more of its own weight and a saline water-absorbing factor, and having a retention rate of the pure water water-absorbing factor of 80% or more after repeated washing 10 times Yarn is shown.

JP 2000-282340 A JP 2001-329439 A

  Conventionally, as a structure of a fabric due to a difference in manufacturing method, a woven fabric made of a yarn consisting of a plurality of single yarns, a knitted fabric or a non-woven fabric made of a single yarn is mixed in a longitudinal direction and a transverse direction to some extent. There was nothing completely unidirectional.

  In addition, since the highly water-absorbing fiber stops water due to swelling, it is suitable for the purpose of water stopping, but has a drawback that only a part of the yarn can use water absorbing performance. However, for example, a water-absorbing material used for sanitary goods absorbs in as wide an area as possible so that the total absorbency increases, which is preferable in terms of rewetting performance. In particular, when used in a gusset portion, it is desirable to narrow in the width direction and diffuse in one direction.

  The present invention provides such a water-absorbing material, and its purpose is to have mechanical strength sufficient for practical use, high water-absorbing performance, and diffusibility, particularly unidirectional diffusibility. An object of the present invention is to provide a non-woven material.

The above-mentioned object is a non-woven fabric formed by heat fusion at the contact portion between the spun yarn (A) containing the heat-fusible fiber and the highly water-absorbing fiber, or the water-absorbing fiber containing the heat-fusible fiber and other fibers Non-woven fabric formed by heat-sealing at the contact portion between the spun yarn (B) and the spun yarn (A), or a super-absorbent fiber containing heat-fusible fiber and other fibers. This is achieved by a non-woven fabric formed by heat-sealing at a contact portion between composite spun yarns (C), which is characterized by twisting the spun yarn (B) and the spun yarn (A).

  According to the present invention, it is possible to obtain a nonwoven fabric material having practically sufficient mechanical strength, high water absorption performance, and diffusibility, particularly unidirectional diffusibility.

  The non-woven fabric of the present invention is a non-woven fabric obtained by heat-sealing at a contact portion between spun yarns (A) containing heat-fusible fibers and superabsorbent fibers, and the spun yarn (A) is (1) 5 -50 wt% heat-fusible fiber, (2) 5 to 80 wt% superabsorbent fiber, and (3) 15 to 90 wt% of other fibers.

  In addition, between the above-mentioned spun yarn (A), a spun yarn (B) that includes a heat-fusible fiber and other fibers and does not contain a superabsorbent fiber, and a composite spun yarn (C) It is the nonwoven fabric formed by heat-sealing at the contact part.

  Examples of the highly water-absorbing fiber used in the present invention include a fiber made of a so-called highly water-absorbing polymer having a water absorption capacity of about 800% by weight or more of its own weight.

  Among them, those that absorb water of 1000% by weight or more, further 2000% by weight or more of ion-exchanged water, or water that absorbs 800% by weight or more of physiological saline, or 1200% by weight or more of water are preferably used.

  Examples of such superabsorbent fibers include crosslinked acrylate fibers (trade name “BEL OASIS” manufactured by Kanebo Synthetic Co., Ltd.), superabsorbent acrylonitrile fibers, acrylic modified fibers, PVA fibers, and the like.

  When the content of the superabsorbent fiber is 5 to 80% by weight, a spun yarn having sufficient water absorption performance can be obtained, the strength as a spun yarn has no practical problem, and the diffusion performance is sufficient. The performance of the superabsorbent fiber obtained can be fully utilized.

  From the viewpoint of water absorption performance and form retention (strength), the more preferable amount of superabsorbent fiber is 20 to 70% by weight, particularly 30 to 60% by weight.

  The heat-fusible fiber used in the present invention is a fiber containing a component that normally melts at 160 ° C. or less, preferably about 90 to 120 ° C. Preferably, a composite fiber composed of a fusion component having a lower melting point than one and a non-fusion component having a higher melting point than one is used.

  Examples of the heat-fusible fibers preferably used in the present invention include core-sheath type heat-fusible fibers in which the sheath part is made of polyolefin, isophthalic acid or caprolactone copolymer polyester, and the core part is polyethylene terephthalate or polypropylene. . Moreover, the composite fiber by which the polymer of the sheath part and the core part was arrange | positioned at the side by side type | mold can also be used.

  A core-sheath type heat-fusible fiber made of a copolyester having a melting point of 110 to 130 ° C. is easily processed into a spun yarn, and heat treatment is also easy to process at a low temperature. Moreover, the core-sheath-type heat-fusible fiber whose sheath part is made of polyolefin is flexible and suitable for applications in which the texture is important, such as sanitary materials.

The content of the heat-fusible fiber in the spun yarn used for the nonwoven fabric is preferably 5% by weight to 50% by weight, and if it is within this range, the adhesiveness is good, the superabsorbent fiber is removed, and the strength of the yarn There is no fear of lowering, the yarn itself remains flexible, and the texture as a product is good.

  Considering from the texture of the product and the dropping of the fibers, the more preferable content of the heat-fusible fiber is 10 to 30% by weight, more preferably 10 to 20% by weight.

  Moreover, the following are mentioned as an example of the other fiber of the remainder of the said highly water-absorbing fiber and heat-fusible fiber. Synthetic fibers / natural fibers / regenerated fibers can also be used in combination.

  Examples of synthetic fibers include acrylic, modacrylic, polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polytrimethylene terephthalate, polyester such as polylactic acid, polyamides such as nylon 6 and nylon 66, and copolymers thereof. Can be used. Moreover, you may mix these 2 or more types.

  Synthetic fibers can be used as they are, but those provided with various performances by post-processing may be used. For example, the thing which performed the hydrophilic treatment, the flame retardant treatment, and the weathering agent treatment is mentioned.

  The fineness of these synthetic fibers is not particularly limited, but 1 dtex to 20 dtex is preferable. In general, 2 to 5 dtex is more preferable from the viewpoint of texture and productivity. On the other hand, in order to obtain bulkiness and to obtain water absorption performance and diffusivity, it is preferable to mix 5 to 20 dtex thick fibers with the above fibers.

  When natural fibers are used, for example, wool, cotton, silk and the like can be used. A rayon regenerated from natural fiber is also preferred. Also, a mixture of two or more of these may be used.

  Natural fibers can be used as they are, but those imparted with various performances by post-processing may be used. For example, the thing which performed the hydrophilic treatment, the flame retardant treatment, and the weathering agent treatment is mentioned.

  From the viewpoint of diffusibility, it is preferable to use fibers having hydrophilic performance. Specifically, rayon, cotton, and fibers imparted with hydrophilicity by post-processing. Since these synthetic fibers and natural fibers have almost no swelling at the time of water absorption, they exhibit diffusion performance without stopping water.

  In order to impart the above hydrophilic performance by post-processing, generally used hydrophilic treatment agents, antifouling treatment agents and the like are used. For example, antifouling agent SR1000 manufactured by Takamatsu Yushi Seiyaku Co., Ltd. is used.

  The spun yarn (B) is provided with (1) 5 to 70% by weight of heat-fusible fiber, (2) 30 to 95% by weight of regenerated fiber and / or natural fiber and / or hydrophilic performance by post-processing. It is preferable to be composed of the synthetic fiber from the viewpoint of the texture and diffusibility of the product.

  The spun yarn used for the nonwoven fabric of the present invention is not particularly limited in the production method. A general ring spun yarn is preferable from the viewpoint of production cost. Also, in order to improve the water absorption capacity, almost no twisting of spun yarn containing highly water-absorbent fibers is applied, and the covering yarn in which the outer periphery of the dense yarn is covered with the filament yarn, and the bulkiness of the yarn itself is produced. It may be processed into a boucle yarn.

A spun yarn (A) containing a heat-fusible fiber and a superabsorbent fiber and a spun yarn (B) containing a heat-fusible fiber and other fibers and not containing a superabsorbent fiber are twisted together. In the composite spun yarn (C), the spun yarn containing the superabsorbent fiber exhibits mainly the water absorption performance, and the spun yarn not containing the superabsorbent fiber further improves the diffusion performance by induction by capillary action.

  In the final step of the production process, the nonwoven fabric of the present invention is cut by spun yarn to an appropriate length, then drawn in parallel and fused by heat treatment (FIG. 1). Or you may cut | disconnect, after aligning parallelly without heat | fusing and heat-processing and fuse | melting (FIG. 2). Further, these may be laminated and processed. Alternatively, the spun yarn may be cut into a suitable length and then randomly arranged and then heat treated and fused (FIG. 3). When arranged at random, the diffusibility in one direction is worse than when aligned in parallel, but it is effective because the diffusibility is better than that of a non-woven fabric made of ordinary short fiber single yarn.

  The heat treatment is performed in a steam kettle with steam at 80 to 130 ° C. for 5 minutes, and dried with a hot air circulation dryer or the like. Alternatively, they are arranged in parallel without being cut, treated with steam at 80 to 130 ° C. for 5 minutes in a steam kettle, and dried with a hot air circulation dryer or the like. These heat treatments are preferably performed at 150 ° C. or lower. If the temperature exceeds 150 ° C., the water absorbing ability of the superabsorbent fiber may be hindered and the spun yarn becomes too hard.

  These heat treatments are not limited to the above methods. For example, it may be continuously heat-fused with a hot air circulation dryer or may be fused with a far-infrared heater.

  By performing the heat treatment as described above, it is possible to prevent the superabsorbent fibers from falling off. In addition, the spun yarns are fixed to each other, and there is an effect of increasing practical mechanical strength. Further, in order to assist adhesion between the spun yarns, heat-sealable fibers may be blended between the spun yarns and heat treated. The mixing ratio of the heat-fusible fiber and the heat treatment temperature are appropriately selected in consideration of the balance between the texture of the product and the dropping of the superabsorbent fiber.

  EXAMPLES Hereinafter, although an Example is given and this invention is demonstrated, this invention is not limited to this Example.

[Example 1]
Unitika Fiber Co., Ltd. heat-fusible fiber “Melty (Type 4080)” (2.2 dtex, 51 mm) 15 wt% and Kanebo Gosei Co., Ltd. superabsorbent fiber “Bel Oasis” (10 dtex, 51 mm) 85 wt. % Was mixed and carded to produce a sliver, and a normal ring spun yarn having 700 dtex and a twist number of 300 times / m was produced. 500 yarns were drawn and treated with steam at 130 ° C. for 5 minutes to obtain a nonwoven fabric comprising heat-fusible fibers and superabsorbent fibers and heat-sealed at the contact portion between the spun yarns. This was a good non-woven fabric with a high water absorption performance and less water loss.

[Example 2]
Unitika Fiber Co., Ltd. heat fusible fiber “Melty (Type 4080)” (2.2 dtex, 51 mm) 10 wt% and Kanebo Gosei Co., Ltd. superabsorbent fiber “Bel Oasis” (10 dtex, 51 mm) 40 wt. % And 50% by weight of Rayon “NWD” (2.2 dtex, 51 mm) manufactured by Omikenshi Co., Ltd., and carded to produce a sliver, and 700 dtex, 300 times / m of normal ring spun yarn Manufactured. 500 yarns are drawn together, treated with steam at 130 ° C. for 5 minutes, and heat-sealed at the contact portion between spun yarns composed of heat-fusible fibers and other fibers including superabsorbent fibers. A nonwoven fabric was obtained. This was a good non-woven fabric having bulkiness and flexibility, with less loss of superabsorbent fibers, and having both water absorption performance and unidirectional diffusion performance.

[Example 3]
Heat-fusible fiber “ES023” (2.2 dtex, 51 mm) 20% by weight manufactured by Chisso Corporation
And Kanebo Synthetic Co., Ltd. superabsorbent fiber “BEL OASIS” (10 dtex, 51 mm) 50% by weight and Omikenshi Co., Ltd. rayon “NWD” (2.2 dtex, 51 mm) 30% by weight. Thus, a sliver was produced, and a normal ring spun yarn having 700 dtex and a twist number of 300 times / m was produced. 500 yarns are drawn together, treated with steam at 130 ° C. for 5 minutes, and heat-sealed at the contact portion between spun yarns composed of heat-fusible fibers and other fibers including superabsorbent fibers. A nonwoven fabric was obtained. This was a good non-woven fabric having bulkiness and flexibility, less dropping of superabsorbent fibers, and having both water absorption performance and unidirectional diffusion performance.

[Example 4]
Regular polyester staple (manufactured by Oshima Sangyo Co., Ltd.) treated with 20% by weight of melt-bondable fiber “Melty (Type 4080)” (2.2 dtex, 51 mm) manufactured by Unitika Fiber Co., Ltd. and Takamatsu Yushi Seiyaku “SR1000” 2.2 dtex, 51 mm) was mixed with 80% by weight and carded to produce a sliver to produce a normal ring spun yarn (B) having 700 dtex and a twist number of 250 times / m. Further, unit adhesive fiber "Melty (Type 4080)" (2.2 dtex, 51 mm) 10% by weight manufactured by Unitika Fiber Co., Ltd. and superabsorbent fiber "Bel Oasis" (10 dtex, 51 mm) manufactured by Kanebo Gosei Co., Ltd. ) 50% by weight and 40% by weight of rayon “NWD” (2.2 dtex, 51 mm) manufactured by Ohmi Kenshi Co., Ltd. are mixed and carded to produce a sliver, 700 dtex, twist number of 250 times / m A ring spun yarn (A) was produced. The two types of spun yarns were twisted at a twist rate of 300 times / m to produce a 1450 dtex composite spun yarn (C). 300 composite spun yarns (C) were drawn and treated with steam at 130 ° C. for 5 minutes to obtain a nonwoven fabric composed of the composite spun yarn. This was a good non-woven fabric having bulkiness and flexibility, with less loss of superabsorbent fibers, and having both water absorption performance and unidirectional diffusion performance.

[Example 5]
The spun yarn (A) containing the heat-fusible fiber and the highly water-absorbing fiber produced in Example 4, and the spinning yarn containing the heat-fusible fiber and other fibers produced in Example 4 and not containing the highly water-absorbing fiber. Three hundred yarns (B) were alternately arranged without twisting, and treated with steam at 130 ° C. for 5 minutes to obtain a nonwoven fabric composed of the two types of spun yarns. This was a good non-woven fabric having bulkiness and flexibility, less dropping of superabsorbent fibers, and having both water absorption performance and unidirectional diffusion performance.

[Comparative Example 1]
Unitika Fiber Co., Ltd. heat-fusible fiber “Melty (Type 4080)” (2.2 dtex, 51 mm) 20 wt% and Kanebo Gosei Co., Ltd. superabsorbent fiber “Bel Oasis” (10 dtex, 51 mm) 80 A sliver was produced by blending the weight% and carding to produce a normal ring spun yarn having 700 dtex and a twist number of 300 times / m. A plain fabric was produced using this spun yarn. This plain woven fabric was less diffusible in one direction than the nonwoven fabric of Example 1.

[Comparative Example 2]
A ring spun yarn having a two-layer structure in which 90% polyester short fibers (single fiber degree: 1 dtex) in the sheath part and 10% superabsorbent acrylonitrile-based short fibers (single fiber degree: 3 dtex) in the core part was obtained. The superabsorbent acrylonitrile-based short fibers are contained in an amount of 8.2% by weight on the inner layer side and 1.8% by weight on the surface layer side. The polyester short fibers are mainly present on the surface layer side. Tendon knitted fabric was knitted using the spun yarn. This knitted fabric is smooth and has no stickiness for clothing, but its water absorption performance is low and its diffusibility during water absorption and diffusibility in one direction is also poor.

  According to the present invention, it is possible to obtain a nonwoven fabric material having practically sufficient mechanical strength, high water absorption performance, and diffusibility, particularly unidirectional diffusibility. For example, when used as a water-absorbing material such as sanitary hygiene products such as napkins, absorption and diffusion can be controlled unidirectionally, which is suitable as a material for the gusset portion. It is also useful as nutrient water retention and transfer cloth during hydroponics. It can also be used as a wiping cloth.

Nonwoven fabric of the present invention in which spun yarns are aligned in parallel and enlarged view Nonwoven fabric of the present invention to be cut later Nonwoven fabric of the present invention in which spun yarns are randomly arranged

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Nonwoven fabric of the present invention 2 Spinned yarn 3 Heat-fusible fiber 4 Superabsorbent fiber or other fiber 5 Bonded portion 6 Cut portion

Claims (3)

A nonwoven fabric characterized by being heat-sealed at a contact portion between spun yarns (A) containing heat-fusible fibers and superabsorbent fibers. The spun yarn in which the nonwoven fabric is composed of (1) 5 to 50% by weight of heat-fusible fiber, (2) 5 to 80% by weight of superabsorbent fiber, and (3) 15 to 90% by weight of other fibers. The nonwoven fabric according to claim 1, wherein the nonwoven fabric is heat-sealed at the contact portion of (A). And includes a heat-fusible fibers and other fibers spun yarn containing no superabsorbent fibers (B) in claim 1 or spun yarn according to claim 2 (A) and a twisted composite yarn (C ) a, the composite yarn (C) nonwoven fabric characterized by being thermally fused at the contact portion between each other.

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