JP4359094B2 - Fine fiber manufacturing method and nonwoven fabric - Google Patents

Description

  The present invention relates to a method for producing fine fibers and a nonwoven fabric.

  Nonwoven fabrics composed of fibers having a fiber diameter of 5 μm or less (hereinafter referred to as fine fibers) are excellent in various properties such as filtration performance, flexibility, concealability, and wiping properties, and therefore can be suitably used. As one method for producing a nonwoven fabric composed of such fine fibers, fibers (so-called island components) in which a resin component (island component) that is difficult to remove by this solution is dispersed in a resin component (sea component) that can be removed by a solution. Sea-island fiber), the fiber web is formed by the card method or air lay method, etc., and then the fibers are entangled by the action of a needle or water flow to form the entangled fiber web. There is a method of dissolving and removing the components with the solution.

  According to this method, a non-woven fabric made of fine fibers can be produced. However, since the fine fibers are in a bundled state, a water stream is used to unwind the fine fiber bundles or to give form stability. It was necessary to apply a fluid flow such as. However, the nonwoven fabric to which this fluid flow is applied is insufficient in terms of texture.

  Therefore, after removing the sea component of the sea-island type long fiber to form a long and narrow fiber bundle, it is cut into a desired length and formed into a short and short fiber, and a fiber web is formed by a wet method using this thin and short fiber. It was thought that a superior nonwoven fabric could be produced. However, when the elongated fiber bundle is cut, the short fibers are fused with each other, and it is difficult to produce a nonwoven fabric with excellent texture.

  In addition, a method of forming a narrow fiber by removing the sea component of the sea-island short fiber before forming the slender fiber bundle, that is, after cutting the sea-island long fiber bundle into a sea-island short fiber was also considered. However, even in this case, when the sea-island type long fiber bundle is cut to form the sea-island type short fibers, the island components are fused with each other, and it is difficult to produce a nonwoven fabric with excellent texture. There was a problem.

  Accordingly, the applicant of the present application has proposed a method of forming a narrow fiber by removing the sea component of the sea-island long fiber to obtain a slender fiber bundle, applying an oil agent to the slender fiber bundle, and then cutting it (patent). Reference 1). According to this method, although it was possible to suppress the fusion of the short fibers at the time of cutting, there was a case where the thin fibers were pressed.

JP 2003-119668 A (claims, etc.)

  The present invention was made in order to solve the above-described problems, and the method for producing fine fibers, which can suppress the press-bonding between the fine fibers as compared with the prior art, and as a result, can produce a nonwoven fabric with excellent texture, And it aims at providing the nonwoven fabric using this fine fiber.

  As described above, sea components of the sea-island type long fibers are removed to form a slender fiber bundle, and an oil agent is applied to the slender fiber bundle and then cut to form a short fiber. In pursuit of the cause that may occur, it was found that the elongated fibers were already pressure-bonded at the time when the sea components of the sea-island long fibers before the cutting process were removed to form a bundle of elongated fibers. This is a conventional method for removing sea components of sea-island long fibers by passing a solution that can remove sea components from the inside of the perforated bobbin to the outside while the sea-island long fibers are wound around the perforated bobbin. The sea component was dissolved and removed by the pressure, but it was found that pressure was applied due to the resistance of liquid passage when the solution passed through, and the elongated fibers were pressure-bonded.

The present invention has been made based on the above findings, the invention according to claim 1 of the present invention, "alkaline water a first resin component which can be removed by a solution, a second removal is difficult by the alkaline water solution Passing the alkaline aqueous solution from the inside to the outside of the perforated bobbin or passing the alkaline aqueous solution from the outside to the inside of the perforated bobbin with a continuous composite fiber containing a resin component wound around the perforated bobbin Accordingly, the first resin component is removed, a process for producing the fine fibers made of the second resin component, in order to prevent the bonding of the fine fibers, nonionic surfactants or amphoteric surfactants in the alkaline water solution A method for producing fine fibers, characterized in that an activator and a weight loss accelerator are present. According to the invention of claim 1, that the nonionic surfactant or amphoteric surfactant is present in an alkaline aqueous solution, the first resin component between the second resin component (fine fibers) is removed When the nonionic surfactant or amphoteric surfactant adheres between the second resin components (fine fibers), it is possible to prevent pressure bonding between the fine fibers due to heat and liquid flow pressure. . When the first resin component is removed in a state where the continuous conjugate fiber is wound around the perforated bobbin, the continuous conjugate fiber has a low degree of freedom, and the alkaline aqueous solution easily passes between the second resin components (fine fibers). Nonionic surfactants or amphoteric surfactants tend to adhere between the fine fibers. For this reason, it is possible to more effectively prevent the press-bonding of the fine fibers due to the heat and the pressure of liquid flow. Further, after the first resin component is removed, the fine fiber is still wound around the perforated bobbin in the same state as the composite fiber is wound around the perforated bobbin, and is wound around the perforated bobbin. Since the first resin component can be removed in a compact state, fine fibers can be efficiently produced in large quantities.

The invention according to claim 2 of the present invention, "nonionic surfactant or amphoteric surfactant, and a reduction promoter, by which is previously added to the alkaline aqueous solution, it is present in an alkaline aqueous solution The method for producing a fine fiber according to claim 1. According to invention of Claim 2, the crimping | compression-bonding of the fine fibers by the pressure of a heat | fever and a liquid flow can be prevented effectively.

The invention according to claim 3 of the present invention, "nonionic surfactant or amphoteric surfactant, by using a composite fiber nonionic surfactant or amphoteric surfactant has been applied, the alkaline water solution 3. A method for producing fine fibers according to claim 1 or 2, characterized in that it exists. According to invention of Claim 3, the crimping | compression-bonding of the fine fibers by the pressure of a heat | fever and a liquid flow can be prevented effectively.

  The invention according to claim 4 of the present invention is "the method for producing fine fibers according to any one of claims 1 to 3, wherein the second resin component is made of a polyolefin resin". Even in the case of a polyolefin resin having a relatively low heat distortion temperature as in the invention of claim 4, it is possible to effectively prevent the pressure bonding between the fine fibers due to heat and the pressure of liquid flow.

  The invention according to claim 5 of the present invention is “the method for producing fine fibers according to any one of claims 1 to 4, wherein the fiber diameter of the fine fibers is 5 μm or less”. As in the fifth aspect of the invention, even if the fiber diameter is 5 μm or less, which is easily deformable and pressure-bonded, it is possible to effectively prevent the pressure-bonding of the fine fibers due to heat and liquid pressure.

The invention according to claim 6 of the present invention is a “nonwoven fabric characterized by including fine fibers manufactured by the manufacturing method according to any one of claims 1 to 5 ”. The fine fibers produced by the above production method are non-woven fabrics with good texture because they have little pressure bonding.

  According to the method for producing fine fibers of the present invention, the presence of the nonionic surfactant or amphoteric surfactant in the predetermined solution for removing the first resin component of the composite fiber allows the second resin component (fine fiber). Since the surfactant adheres between the fine fibers while the first resin component between the fibers) is removed, it is possible to prevent the fine fibers from being pressed against each other due to heat and the pressure of liquid flow. Therefore, the nonwoven fabric of this invention using this fine fiber has a good formation.

  The method for producing fine fibers of the present invention will be described with reference to FIG. 1 which is a vertical sectional view schematically showing the removed state of the first resin component in the composite fiber. In FIG. 1, 1 is a composite fiber, 2 is a perforated bobbin, and 3 is a predetermined solution capable of removing the first resin component of the composite fiber. In FIG. 1, the composite fiber 1 is a continuous fiber and is wound around the perforated bobbin 2, and the predetermined solution 3 is passed from the inner side 2a to the outer side 2b of the perforated bobbin 2, or By passing the predetermined solution 3 from the outer side 2b of the perforated bobbin 2 to the inner side 2a, the first resin component of the composite fiber 1 is removed, and fine fibers composed of the second resin component are formed. Since the predetermined solution 3 contains a nonionic surfactant or an amphoteric surfactant, when the predetermined solution 3 passes through the perforated bobbin 2, the nonionic surfactant or the amphoteric surfactant is used. Adheres between the second resin components (fine fibers). Therefore, the crimping | compression-bonding of the fine fibers by the pressure of heat and liquid flow is prevented. In addition, the passage of such a predetermined solution 3 can be performed, for example, by attaching the perforated bobbin 2 to a cheese dyeing machine.

  As described above, the presence of the nonionic surfactant or amphoteric surfactant in the predetermined solution 3 provides the above-mentioned effect. However, the nonionic surfactant or amphoteric surfactant is the predetermined solution 3. Preexisting in the predetermined solution 3 by using the one added with the nonionic surfactant or amphoteric surfactant as the composite fiber 1 Or present in a given solution 3 due to both of these factors. According to the method of adding a nonionic surfactant or an amphoteric surfactant to the predetermined solution 3 in advance, the concentration of the nonionic surfactant or amphoteric surfactant in the predetermined solution 3 can be easily adjusted, and the composite fiber 1 This is more preferable because it does not require the trouble of applying a nonionic surfactant or an amphoteric surfactant when winding up.

  The surfactant used in the present invention is not particularly limited as long as it is nonionic or amphoteric. For example, examples of the nonionic surfactant include a polyethylene glycol type surfactant and a polyhydric alcohol type surfactant. Examples of amphoteric surfactants include betaine surfactants. Among these, it has been found that polyoxyethylene nonylphenyl ether or higher alcohols are particularly effective. The amount of the nonionic surfactant or the amphoteric surfactant is not particularly limited. However, the amount of nonionic surfactant or amphoteric surfactant is 0. It is preferably at least 05%, more preferably at least 0.2%. On the other hand, if the abundance in the predetermined solution 3 is too large, the removal rate of the first resin component is slowed. Therefore, it is preferably 2% or less with respect to the mass 100 of the predetermined solution 3, and preferably 1% or less. More preferably.

  The predetermined solution 3 of the present invention contains the nonionic surfactant or amphoteric surfactant as described above. In addition to these surfactants, for example, a quaternary ammonium salt type cationic surfactant is used. The weight loss promoter which becomes may be included. Even when such a weight loss accelerator is included, the activity of the nonionic surfactant or the amphoteric surfactant is not impaired, so that the pressure bonding between the fine fibers can be prevented stably.

  The composite fiber 1 includes a first resin component that can be removed by the predetermined solution 3 and a second resin component that is difficult to remove by the predetermined solution 3. Therefore, by removing the first resin component with the predetermined solution 3, fine fibers composed of the second resin component can be generated.

  “Removable” in the composite fiber 1 means that 95% by mass or more of the resin component can be removed by the predetermined solution 3, and “difficult to remove” means that the resin component is removed under the condition of removing the first resin component. It means that only 30 mass% or less is removed.

  Specific examples of such a conjugate fiber 1 include polyesters (for example, polyethylene terephthalate, polyethylene terephthalate copolymer, polybutylene terephthalate, polybutylene terephthalate) that can be removed with respect to an alkaline aqueous solution (for example, sodium hydroxide solution). A copolymer, a polyglycolic acid, a glycolic acid copolymer, a polylactic acid, a lactic acid copolymer, etc.) and a polyolefin-based resin or a polyamide-based resin that is difficult to remove with respect to an alkaline aqueous solution.

  The second resin component does not have to be composed of one kind of resin component that is difficult to be removed by the predetermined solution 3, and may be composed of two or more kinds. For example, it is preferable that the second resin component is made of two types of resins, because the fine fibers composed of the second resin component can have various characteristics such as fusibility, crimping and splitting properties. . More specifically, if it is composed of two types of resins having a difference in melting point, it can be a fine fiber having a fusion property and a fiber shape retention property at the time of fusion, and there is no difference in terms of heat shrinkability. If it is composed of two kinds of resins, it can be a fine fiber with a crimping property, and if it is composed of two kinds of resins having a large difference in solubility parameter, it is a fine fiber that can be mechanically divided. Can be fiber.

  In addition, even if it is a case where the 2nd resin component of the composite fiber 1 consists of polyolefin resin, a fine fiber can be manufactured, without making a fine fiber crimp. That is, polypropylene and polyethylene have a relatively low thermal deformation temperature, and the fine fibers are easily pressure-bonded by heat and the pressure of passing through the predetermined solution 3, but according to the present invention, the polyolefin fibers can be bonded without pressure-bonding the fine fibers. Fine fibers can be produced. In addition, since the polyolefin-based resin is excellent in terms of chemical resistance, electret properties, etc., there is also an effect that a nonwoven fabric applicable to various uses can be produced. When the second resin component is a combination of polymethylpentene and polypropylene, polymethylpentene and polyethylene, polypropylene and polyethylene, high-density polyethylene and low-density polyethylene, etc., a fine fiber having a fusion component and a non-fusion component Since this fine fiber can be fused without losing the fiber form, it has a feature that it is difficult to fall off.

  The cross-sectional shape of the conjugate fiber 1 of the present invention is not particularly limited, and examples thereof include a sea-island type, a multiple bimetal type, and an orange type. In addition, the second resin component in the composite fiber 1 of the present invention constitutes a fine fiber, but the fiber diameter is 5 μm or less so that a nonwoven fabric excellent in various properties such as filtration performance, flexibility, concealability, and wiping property can be produced. It is preferable that a fine fiber of 3 μm or less can be generated, and it is more preferable that a fine fiber of 2 μm or less can be generated. In addition, although the minimum of the fiber diameter of a fine fiber is not specifically limited, It is preferable that it is 0.01 micrometer or more. The smaller the fiber diameter is, the easier it is to deform and pressure-bond. However, according to the production method of the present invention, even if the fiber diameter is 5 μm or less, the pressure of heat and liquid flow The effect that it can manufacture by preventing the crimping | compression-bonding of the fine fibers by effectively is produced. The “fiber diameter” in the present invention is a value converted into a circular cross section.

  The composite fiber 1 in FIG. 1 is composed of continuous fibers, as is apparent from the fact that the composite fiber 1 is wound around the bobbin 2 with holes. Such a continuous conjugate fiber 1 has a low degree of freedom, and the predetermined solution 3 easily passes between the second resin components (fine fibers), so that a nonionic surfactant or an amphoteric surfactant adheres between the fine fibers. Cheap. Therefore, it is possible to effectively prevent the pressure-bonding between the fine fibers due to heat and the pressure of liquid flow. However, even if the composite fiber 1 is not a continuous fiber but is a short fiber cut to a predetermined length, the same effect can be obtained.

  As described above, the composite fiber 1 of FIG. 1 has been described based on the aspect in which the first resin component is removed by the predetermined solution 3 in the state where the composite fiber 1 is wound around the perforated bobbin 2, but the present invention is not limited to this aspect. The fine fiber of the present invention can be produced by immersing the composite fiber cut to a predetermined length in a container filled with a predetermined solution containing a nonionic surfactant or an amphoteric surfactant, and can be suspended. The fine fibers of the present invention can also be produced using a predetermined solution in which a nonionic surfactant or an amphoteric surfactant is present using a skein dyeing machine.

  The non-woven fabric of the present invention is a non-woven fabric having a good texture because it is a non-woven fabric containing fine fibers produced by the production method as described above, that is, fine fibers in which the fine fibers are not pressure-bonded. Although the nonwoven fabric of this invention contains the fine fiber manufactured with the above manufacturing methods, since the content changes with physical properties required for a nonwoven fabric, it does not specifically limit. Generally, it is preferable to contain a lot of fine fibers when filtration performance, flexibility, concealment, wiping properties, etc. are required at a high level.

  In the nonwoven fabric of the present invention, it is preferable that the fine fibers are not entangled by an external force such as a water flow so that the fine fibers are uniformly dispersed and the texture is excellent. Therefore, the fusion fiber is mixed with the fine fiber, and the non-woven fabric is maintained by fusing the fusion fiber, or the fine fiber is composed of two or more kinds of resins having different melting points, and the fine fiber itself It is preferable to maintain the non-woven fabric form by fusing.

  As a specific method for producing the nonwoven fabric of the present invention, after producing fine fibers as described above, if the fine fibers are continuous fibers, they are cut to a desired length. In addition, since the fine fibers may be fused at the time of this cutting, cutting is performed by the method disclosed in Japanese Patent Application Laid-Open No. 2003-119668 so that the fine fibers are not fused. Is preferred. That is, an oil agent (anionic, cationic, nonionic surfactant, etc.) is given to the continuous fine fiber bundle (preferably 15% or more with respect to the mass 100 of the continuous fine fiber bundle, and 20% or more. Is more preferable, and is preferably 50% or less), and a conventional cutting device (for example, a guillotine cutter) in a state where the continuous fine fiber bundle is fixed by winding the film around the continuous fine fiber bundle. Is preferably used to cut the continuous fine fiber bundle to a desired length. It should be noted that an oil agent (anionic, cationic, nonionic surfactant, etc.) is imparted to the continuous fine fiber bundle (preferably 15% or more with respect to the mass 100 of the continuous fine fiber bundle, and 20% or more. Is more preferable and 50% or less is preferable), the continuous fine fiber bundle can be cut into a desired length by a rotary cutter without fixing with a film.

  Subsequently, a fiber web is produced by a conventional method using short and short fibers, and if necessary, using fused fibers. As a method for producing this fiber web, it is preferable to produce the fiber web by a wet method that facilitates the production of a nonwoven fabric excellent in texture in which the fine fibers are easily handled and the fine fibers are uniformly dispersed.

  Thereafter, the nonwoven fabric of the present invention can be produced by bonding the fiber web. The bonding method of the fiber web is not particularly limited, but the mixed fused fibers can be fused by fusing the short fibers without being entangled by a water flow or the like so that a nonwoven fabric having excellent texture can be produced. Examples thereof include a method of bonding by attaching, or by adhering with an emulsion-like or suspension-like binder.

  Examples of the present invention will be described below, but the present invention is not limited to the following examples.

(Example 1)
A sea-island composite continuous fiber having a fineness of 140,000 dtex, in which the sea-island composite continuous fibers interspersed with the first resin component, polyethylene terephthalate (sea component), is dispersed with the second resin component, polypropylene (island component). A bundle was prepared. Next, this sea-island type composite continuous fiber bundle was wound around a bobbin 2 with a hole of about 140 m and mounted on a cheese dyeing machine.

  On the other hand, a sodium hydroxide solution (60 g / L) which is the predetermined solution 3 capable of removing the first resin component, a quaternary ammonium salt type cationic surfactant (weight loss accelerator, 3 g / L), and polyoxyethylene Nonylphenyl ether (0.3% with respect to 100 mass of the predetermined solution 3) was added to prepare a mixed predetermined solution 3.

  Next, with the mixed predetermined solution 3 heated to a temperature of 98 ° C., the mixed predetermined solution 3 is passed from the inner side 2a of the perforated bobbin 2 to the outer side 2b, whereby the first resin component of the sea-island type composite continuous fiber is obtained. A certain polyethylene terephthalate was removed to produce a polypropylene fine continuous fiber bundle having a fiber diameter of 2 μm.

  Next, 5% of the oil agent (nonionic surfactant) was applied to the polypropylene fine continuous fiber bundle with respect to the mass 100 of the fiber bundle, and then cut into a length of 3 mm with a rotary cutter to produce polypropylene fine fibers.

70 mass% of this polypropylene short staple fiber and 30 mass% of separately prepared core-sheath-type fusion fibers (composed of a polypropylene core component and a low-density polyethylene sheath component, fiber diameter: 17.5 μm, fiber length: 10 mm) are mixed with a stirrer. And dispersed, and then wet paper making to form a wet fiber web. Thereafter, the wet fiber web is supplied to an oven set at a temperature of 120 ° C., and only the low-density polyethylene of the core-sheath type fused fiber is fused to form a nonwoven fabric (weight per unit: 40 g / m ² , thickness: 0.22 mm). Manufactured. An electron micrograph of the nonwoven fabric surface is shown in FIG. As apparent from FIG. 2, the polypropylene short fibers were loosened one by one, and were uniformly dispersed and had good texture. This was due to the fact that the polypropylene short fibers were not pressure-bonded.

(Example 2)
As a sea-island type composite continuous fiber bundle, the sea-island type composite continuous fibers in which the first resin component is made of polyethylene terephthalate (sea component) and the second resin component is made of low-density polyethylene (island component) are bundled to obtain a fineness of 140,000. Except for using a sea-island type continuous fiber bundle made of dtex, exactly as in Example 1, production of a high-density polyethylene fine continuous fiber bundle having a fiber diameter of 2 μm and production of a high-density polyethylene fine short fiber having a fiber length of 3 mm Carried out.

Next, 100 mass% of the high-density polyethylene fine fibers were dispersed with a stirrer, and then wet papermaking was performed to form a wet fiber web. Thereafter, the wet fiber web was supplied to an oven set at a temperature of 120 ° C., and the high density polyethylene fine fibers were fused to produce a nonwoven fabric (weight per unit: 30 g / m ² , thickness: 0.15 mm). Observation of an electron micrograph of the surface of this nonwoven fabric revealed that, like the nonwoven fabric of Example 1 (FIG. 2), the high-density polyethylene fine fibers were loosened one by one, uniformly dispersed, and with good texture Met. This was due to the fact that the high-density polyethylene thin fibers were not pressure-bonded.

(Example 3)
As the mixed predetermined solution 3, a sodium hydroxide solution (60 g / L), a quaternary ammonium salt type cationic surfactant (weight loss accelerator, 3 g / L), and a higher alcohol nonionic surfactant (of the predetermined solution 3) Production of a polypropylene continuous fiber bundle having a fiber diameter of 2 μm, and polypropylene short fibers having a fiber length of 3 mm, except that the mixed predetermined solution 3 added with 0.3% of mass 100) was used. , Formation of a wet fiber web, and manufacture of a nonwoven fabric (weight per unit: 40 g / m ² , thickness: 0.20 mm). An electron micrograph of the nonwoven fabric surface is shown in FIG. As is apparent from FIG. 3, the polypropylene short fibers were loosened one by one, and were uniformly dispersed and had good texture. This was due to the fact that the polypropylene short fibers were not pressure-bonded.

(Example 4)
Polyoxyethylene nonylphenyl ether 4.5 mass% solution for sea-island type composite continuous fiber in which polypropylene (island component) as second resin component is interspersed in polyethylene terephthalate (sea component) as first resin component A sea-island type composite continuous fiber bundle having a fineness of 140,000 dtex (30% adhered to the mass of the sea-island type composite continuous fiber bundle) was prepared. Next, the sea-island type composite continuous fiber bundle to which the nonionic surfactant was added was wound around a bobbed bobbin 2 for about 140 m, and then mounted on a cheese dyeing machine.

  On the other hand, only the quaternary ammonium salt type cationic surfactant (weight loss accelerator, 3 g / L) is added to the sodium hydroxide solution (60 g / L) which is the predetermined solution 3 capable of removing the first resin component, A mixed predetermined solution 3 was prepared.

  Next, with the mixed predetermined solution 3 heated to a temperature of 98 ° C., the mixed predetermined solution 3 is passed from the inner side 2a of the perforated bobbin 2 to the outer side 2b, whereby the first resin component of the sea-island type composite continuous fiber is obtained. After removing, a fine polypropylene continuous fiber bundle having a fiber diameter of 2 μm was produced. At the time of removing the first resin component, the concentration of polyoxyethylene nonylphenyl ether in the mixed predetermined solution 3 was 0.2% of the mass 100 of the mixed predetermined solution.

Thereafter, in the same manner as in Example 1, production of polypropylene short fibers having a length of 3 mm, formation of a wet fiber web, and production of a nonwoven fabric (weight per unit: 40 g / m ² , thickness: 0.21 mm) were performed. When an electron micrograph of the surface of this nonwoven fabric was observed, it was found that, as with the nonwoven fabric of Example 1 (FIG. 2), the polypropylene short fibers were loosened one by one and were uniformly dispersed and had good texture. It was. This was due to the fact that the polypropylene short fibers were not pressure-bonded.

(Comparative Example 1)
As the mixed predetermined solution 3, except that the mixed predetermined solution 3 in which only a quaternary ammonium salt type cationic surfactant (weight loss accelerator, 3 g / L) was added to a sodium hydroxide solution (60 g / L) was used. In the same manner as in Example 1, production of a polypropylene fine continuous fiber bundle having a fiber diameter of 2 μm, production of a polypropylene fine fiber having a fiber length of 3 mm, formation of a wet fiber web, and a nonwoven fabric (weight per unit: 39 g / m ² , thickness: 0) .18 mm) was carried out. An electron micrograph of the nonwoven fabric surface is shown in FIG. As is apparent from FIG. 4, the polypropylene short fibers were pressed together and had poor texture.

Vertical sectional view schematically showing the removal state of the first resin component in the conjugate fiber Electron micrograph of the nonwoven fabric surface of Example 1 Electron micrograph of the nonwoven fabric surface of Example 3 Electron micrograph of the nonwoven fabric surface of Comparative Example 1

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Composite fiber 2 Perforated bobbin 2a Inner side of perforated bobbin 2b Outer side of perforated bobbin 3 Predetermined solution

Claims (6)

A first resin component which can be removed by alkaline aqueous solution, in a state where the continuous composite fiber containing said alkaline water solution second resin component removal is difficult by wound on perforated bobbin, from the inside of the perforated bobbin outside to be passed through an aqueous alkaline solution, or by making the outside of the perforated bobbin to pass through the alkaline aqueous solution to the inside, the first resin component is removed, a process for producing the fine fibers made of the second resin component, fine to prevent crimping between fibers, characterized in that the nonionic surfactant or amphoteric surfactant in the alkaline water solution, and weight loss enhancers are present, the production method of the fine fibers. Nonionic surface active agents or amphoteric surface active agent, and a reduction promoter, by which is previously added to the alkaline water solution, characterized in that present in alkaline water solution, fine fibers according to claim 1, wherein Manufacturing method. Nonionic surfactants or amphoteric surfactants, characterized in that by using a composite fiber nonionic surfactant or amphoteric surfactant has been applied, is present in an alkaline aqueous solution, claim A method for producing a fine fiber according to claim 1. The method for producing fine fibers according to any one of claims 1 to 3, wherein the second resin component comprises a polyolefin resin. The method for producing a fine fiber according to any one of claims 1 to 4, wherein the fiber diameter of the fine fiber is 5 µm or less. A non-woven fabric comprising fine fibers produced by the production method according to any one of claims 1 to 5 .

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