TWI628325B - Aplittable composite fiber and manufacturing method for the same, nonwoven fabric and manufacturing method for the same, and wiping cloth - Google Patents

Abstract

The fibrous composite fiber of the present invention is a fiber containing 60% by mass or more and 90% by mass or less of Component A, and 10% by mass or more and 40% by mass or less of Component B, and Component A and Component B are incompatible. Component A or component B is an acrylonitrile-based polymer, and the shape of the fiber cross section perpendicular to the fiber axis is a flat shape with a flatness ratio of 3 or more and 20 or less, and has a composite structure in which component A is a sea part and component B is an island part. The non-woven fabric of the present invention is formed by using the fiber-cutting composite fiber and has a fiber-cutting portion formed by cutting the fiber-cutting composite fiber, and the fiber-cutting portion has a fiber width of 0.01 μm or more and 1 μm or less part.

Description

Fibrous composite fiber and manufacturing method thereof, non-woven fabric and manufacturing method thereof Method and wipes

The present invention relates to a fibrous composite fiber and a manufacturing method thereof, and a nonwoven fabric using the fiber and a manufacturing method thereof.

In recent years, acrylic fibers having a fiber-splitting property have been used in products such as a non-woven wiper (wiper). Most of these products use fibers with a length of 5 mm or less, and are usually processed into products by a papermaking method, and the fibers are finely cut by applying the strength of a beating machine to the fibers. Therefore, although the product has good wiping properties, it is paper-like, has no fluffy feel, and has a hard hand feel due to the use of an adhesive.

Therefore, when using a fiber with a length of 10 mm or more, the fibers can be entangled to form a non-woven fabric. Therefore, it is not necessary to use an adhesive, and a soft feel can be obtained, which is preferable. In addition, the fiber after cutting is preferably finer to exhibit excellent wiping properties.

However, in the case of using a fiber with a longer fiber length, The use of a beater such as a beater or disc refiner in the step causes the following problems, that is, the fibers are entangled to form a fiber ball, and the screen is blocked or the quality of the cloth is deteriorated. Industrially difficult.

It is preferable that the cut fiber of the long fiber is a high-pressure columnar water flow used when a water jet or the like is used. However, the cutting ability of the high-pressure columnar water flow is smaller than that of the beater, so the fiber used is ideally capable of cutting the fiber by using the force of the high-pressure columnar water flow. On the other hand, most of the acrylic fibers having fibrillation properties are easily fibrillated by a beater, but they cannot be sufficiently fibrillated under the external force of a high-pressure columnar current.

Acrylic fibers have been proposed that can be cut using a high-pressure columnar water flow (Patent Document 1). The fiber diameter of the part obtained by cutting the acrylic fiber was 0.1 dtex (diameter: about 3 μm) or more, and the non-woven fabric using the acrylic fiber had a problem in terms of wiping property. In addition, a fiber in which an acrylonitrile-based polymer and cellulose acetate are composited in a sea-island structure has also been proposed (Patent Document 2). However, this composite fiber cannot use a high-pressure columnar water flow force to cut the fiber.

[Prior Art Literature]

[Patent Literature]

[Patent Document 1] Japanese Patent Laid-Open No. 2004-115946

[Patent Document 2] Japanese Patent Laid-Open No. 2003-89924

An object of the present invention is to provide a fiber-cutting composite fiber. The composite fiber is cut with a weak external force of a high pressure columnar water flow, and the fiber after cutting is extremely fine, thereby exhibiting excellent wiping properties when made into a non-woven fabric. In addition, an object of the present invention is to provide a method using the cut fiber. Non-woven fabric with excellent wiping properties of fibrous composite fibers.

The fibrous composite fiber of the present invention is a fiber containing 60% by mass or more and 90% by mass or less of Component A, and 10% by mass or more and 40% by mass or less of Component B, and Component A and Component B are incompatible. Component A or component B is an acrylonitrile-based polymer, and the shape of the fiber cross section perpendicular to the fiber axis is a flat shape with a flatness ratio of 3 or more and 20 or less as specified below, and component A is the sea part and component B is an island Department of the composite structure.

Furthermore, regarding the flattening ratio in the present invention, the longest length in the fiber cross section perpendicular to the fiber axis is set to the maximum width, and the longest length in the thickness direction orthogonal to the maximum width direction is set to the maximum thickness. Set the maximum width / thickness to the flattening ratio.

The fiber-cutting composite fiber of the present invention is preferably a fiber containing 60% by mass or more and 90% by mass or less of Component A and 10% by mass or more and 40% by mass or less of Component B, and Component A and Component B are non-phase Capacitive, component A, composed of acrylonitrile-based polymer, the shape of the fiber cross section perpendicular to the fiber axis is a flat shape with a flatness ratio of 3 or more and 20 or less, and has component A as the sea part and component B as an island Department of the composite structure.

The fibrous composite fiber of the present invention is preferably an acrylonitrile-based polymer. The incompatible component is at least one component selected from the group consisting of cellulose acetate, polyvinyl pyrrolidone, polyvinyl chloride, and cellulose obtained by alkali-treating cellulose acetate.

In the fiber-cut composite fiber of the present invention, the number of island portions per unit fineness in a fiber cross section of a single fiber perpendicular to the fiber axis is preferably 60 / dtex to 200 / dtex.

The fibrous composite fiber of the present invention preferably has a single fiber fineness of 1 dtex or more and 20 dtex or less, a maximum thickness of the flat shape of 1 μm or more and 10 μm or less, and a single fiber elongation of 10% or more and 50% or less.

The manufacturing method of the fibrous composite fiber of the present invention is a method in which a solution in which component A is dissolved in solvent C and a solution in which component B is dissolved in solvent C are mixed to prepare a mixed solution, where component A is Acrylonitrile polymer, component B and component A are incompatible, the mass ratio A / B of component A and component B is 90/10 ~ 60/40, and the mixed solution is sprayed to the containing solvent by a spinning nozzle In the aqueous solution of C, the spinning nozzle has a rectangular shape of the discharge hole, and the ratio of the length of the rectangular long side to the length of the short side, that is, the aperture ratio (long side length / short side length) is 3 or more and No. 20 or less.

In addition, the method for producing a fibrous composite fiber of the present invention is a method in which a solution in which component A is dissolved in a solvent C and a solution in which component B is dissolved in the solvent C are mixed to prepare a mixed solution. B is an acrylonitrile-based polymer, component A and component B are incompatible, and the mass ratio A / B between component A and component B is 90/10 to 60/40, which is described in the ejection hole of the spinning nozzle Spray out of mixed solution In an aqueous solution containing solvent C, the shape of the ejection hole is rectangular, and the ratio of the length of the rectangular long side to the length of the short side, that is, the aperture ratio (long side length / short side length) is 3 or more and 20 the following.

The manufacturing method of the fibrous composite fiber of this invention WHEREIN: It is preferable that the component which is incompatible with an acrylonitrile-type polymer is at least selected from the group which consists of a cellulose acetate, a polyvinyl pyrrolidone, and polyvinyl chloride. An ingredient.

In the method for producing a fibrous composite fiber of the present invention, the solid content concentration of the mixed solution is preferably 15% by mass or more and 30% by mass or less, the concentration of the solvent C in the aqueous solution is 20% or more and 60% or less, and the temperature is Above 20 ° C and below 60 ° C.

The non-woven fabric of the present invention is a non-woven fabric containing the fissionable composite fiber, and has a fiber cutting portion obtained by cutting the fiber-cutting composite fiber. The fiber cutting portion has a fiber width of 0.01 μm or more and 1 μm or less. part.

The nonwoven fabric of the present invention is preferably such that the fiber length of the fissionable composite fiber is 25 mm or more and 150 mm or less, and the content rate of the fissionable composite fiber is 20% by mass or more and 100% by mass or less.

The non-woven fabric of the present invention preferably contains the fiber-cutting composite fiber in an amount of 20% by mass to 80% by mass, and has a fiber-cutting portion in an arbitrary range of 5 mm × 5 mm on the surface of the nonwoven fabric.

In the method for manufacturing a non-woven fabric of the present invention, a high-pressure columnar fluid ejected from an ejection outlet is brought into contact with a web containing the fiber-cutting composite fiber to perform fiber-cutting treatment on the fiber-cutting composite fiber. The pressure is above 5MPa and The distance from the ejection port of the high-pressure columnar fluid to the surface of the mesh is 30 MPa or less and 10 mm or more and 100 mm or less.

The manufacturing method of the nonwoven fabric of this invention WHEREIN: It is preferable that the diameter of the ejection opening which ejects the said high-pressure columnar fluid is 80 micrometers or more and 200 micrometers or less, and the transfer speed of the fiber cutting process of a fibrous composite fiber is 5 m / min and more 200m / min or less.

The wiping cloth of the present invention is a wiping cloth containing the non-woven cloth.

According to the present invention, it is possible to provide a fiber-cutting composite fiber that cuts the fiber with a weak external force of a high-pressure columnar water flow used when water is sprayed or the like, and the fiber-cutting portion after the fiber-cutting becomes Extremely fine fibers exhibit excellent wiping properties when made into a non-woven fabric. In addition, by containing the fibrous composite fiber, a nonwoven fabric having excellent wiping properties can be provided.

D‧‧‧ The part of the composite fiber in the non-woven fabric of the present invention is cut to the extent that no fiber prototype is left.

E‧‧‧ The composite fiber in the nonwoven fabric of the present invention has a fiber prototype part

FIG. 1 is an electron microscope photograph of an example of a nonwoven fabric of the present invention at a magnification of 100 times.

FIG. 2 is an electron microscope photograph of another example of the nonwoven fabric of the present invention at a magnification of 100 times.

Hereinafter, embodiments of the present invention will be described in detail.

In the present invention, the fibrous composite fiber is a component A containing 60% by mass or more and 90% by mass or less of Component A and 10% by mass or more and 40% by mass or less of Component B which is soluble in the solvent C common to Component A Fiber, and component A and component B are incompatible, component A or component B is an acrylonitrile-based polymer, and the shape of the fiber section perpendicular to the fiber axis (hereinafter also simply referred to as the "fiber section") is a flattening ratio of 3 Flat shape from above to below 20.

Since the fiber-cutting composite fiber of the present invention is incompatible with component A, component A having a large mass ratio in the cross section of the fiber forms a composite structure with a sea portion and component B with a small mass ratio becomes an island portion. With this composite structure, fiber cutting is easily performed with a weak external force of a high-pressure columnar water flow.

In the present invention, the term "incompatibility" means that when the solution X in which the component A is dissolved in the solvent C and the solution Y in which the component B is dissolved in the solvent C are mixed, the solution X and the solution Y have interfaces, and separation from each other is observed. Nature.

When the component A or the component B is an acrylonitrile-based polymer, the nonwoven fabric containing the fibrous composite fiber of the present invention has both a hydrophilic property and a lipophilic property, so it is preferable. Furthermore, because the component A is an acrylonitrile-based polymer and has a very narrow acute cut surface, it is easier to obtain it than using other natural materials. Better cleaning performance when using chemical fibers. In addition, it is more preferable in terms of manufacturing the fibrous composite fiber because it is easy to stretch and the spinnability is easily improved.

On the other hand, even if the component B is an acrylonitrile-based polymer, the component A is preferably selected from those which do not pose a problem in terms of spinnability and can obtain fibrillation with a weak external force at a high pressure columnar flow. Examples of the component A include cellulose acetate and polyethylene. Pyrrolidone, polyvinyl chloride, cellulose.

When the mass ratio of the component A in the fiber-cutting composite fiber is 60% by mass or more, the fiber-cutting composite fiber becomes a sea-island composite structure, and if it is 90% by mass or less, the fiber-cutting composite fiber is easily cut.

In addition, if the mass ratio of the component B in the fibrous composite fiber is 10% by mass or more, it is easy to cut the fibrous composite fiber with a weak external force of a high pressure columnar water flow, and if the mass ratio is 40 When the mass% or less, the fibrous composite fiber easily becomes a sea-island composite structure, and the number of times of elongation and thread breakage during spinning is reduced, and the step passability is easily improved. In the present invention, a so-called weak external force, and a water flow having a pressure of about 30 MPa becomes a standard.

The acrylonitrile-based polymer as a component of the fibrous composite fiber of the present invention is a polymer containing an acrylonitrile monomer and an unsaturated monomer copolymerizable therewith, and the acrylonitrile unit accounts for 50% by mass or more. Examples of unsaturated monomers that can be copolymerized with such acrylonitrile monomers include acrylic acid, methacrylic acid, and such alkyl esters, vinyl acetate, acrylamide, vinyl chloride, and vinylidene chloride. According to the purpose, further examples include sodium vinylbenzenesulfonate, sodium allylsulfonate, sodium allylsulfonate, sodium acrylamide methylpropanesulfonate, sodium p-sulfophenylmethallyl ether Plasma unsaturated monomer. The unsaturated monomer copolymerizable with the acrylonitrile monomer is more preferably vinyl acetate. By using vinyl acetate, the dyeability is improved, and the manufacturing cost is reduced.

As long as the component is incompatible with the acrylonitrile polymer in the fiber-cut composite fiber of the present invention, the component is incompatible with the acrylonitrile polymer and is dissolved in a solvent that dissolves the acrylonitrile polymer. The composition is not particularly limited. Said into The component is preferably a component selected from the group consisting of cellulose acetate, cellulose, polyvinylpyrrolidone, polyvinyl chloride, and cellulose obtained by alkali-treating cellulose acetate.

With these components, spinnability is good, and formation of a sea-island structure becomes easy.

The component that is incompatible with the acrylonitrile-based polymer is more preferably cellulose acetate having good fiber-cutting property under a weak external force of a high pressure columnar water flow. Furthermore, from the viewpoint of water absorption, the cellulose acetate is preferably cellulose acetate having an average degree of acetylation of 48.8% or more and 62.5% or less, and more preferably an average degree of acetylation of 48.8% or more and 56.2. % Diethylammonium cellulose.

Moreover, it is more preferable that it is a cellulose obtained by celluloseizing all or a part of these cellulose acetates by an alkali treatment, since water absorption is further improved.

The fibrous composite fiber of the present invention may contain other polymers, antibacterial agents, antistatic agents, preservatives, and the like within a range that does not impair the fibrous properties derived from the sea-island structure.

The fibrous composite fiber of the present invention preferably has a flat shape with a flatness ratio of 3 or more and 20 or less in the fiber cross section. When the flattening ratio in the fiber cross section is 3 or more, it is easy to receive external force of a high-pressure columnar water flow, and the fiber is easily cut. When the flattening ratio is 20 or less, the spinning of the fibrous composite fiber becomes easy. From the viewpoint of fiber-cutting property and spinnability, the flatness ratio is more preferably from 4 to 15, and the flatness ratio is even more preferably from 5 to 10.

In the present invention, the flatness ratio is measured by a method described later (a method of measuring the flatness ratio).

The fibrous composite fiber of the present invention is provided with a high-pressure columnar shape. Fibre cutting is performed by a weak external force such as water flow. Therefore, the fiber cross section of the fibrous composite fiber is preferably a flat shape that is susceptible to the impact of a weak external force to the extent of a high-pressure columnar water flow. In addition, it is important that the polymer forming the fibrous composite fiber moderately extends the alignment in the fiber axis direction, and forms an interface between different types of polymers inside the fibrous composite fiber. Therefore, the fiber-cutting composite fiber of the present invention has a composite structure that is weak against external forces, and exhibits excellent fiber-cutting ability to effectively fiber-cut the fiber-cutting composite fiber even under a weak external force with a high-pressure columnar current.

The fiber-cutting composite fiber of the present invention preferably has a number of island portions per unit fineness in a fiber cross section of a single fiber of 60 / dtex or more and 200 / dtex or less. If the number of island portions per unit fineness is 60 or more / dtex, the interface between the two components will increase and the fibrillability will be good. Therefore, the wipeability when the nonwoven fabric is made will be good. If the number is 200 or less / dtex, the fiber strength of the cut fiber composite fiber is not easily reduced, and the spinnability is improved. From the viewpoint, the number of the island portions per unit fineness is preferably 70 or more and 130 or less, and more preferably 72 or more and 110 or less.

The cut fiber composite fiber of the present invention preferably has a single fiber fineness of 1 dtex or more and 20 dtex or less. If the single fiber fineness of the cut fiber composite fiber is 1 dtex or more, the spinning of the cut fiber composite fiber becomes easy. If the single fiber fineness is 20 dtex or less, the thickness of the fiber cross section becomes small, even in a high-pressure columnar water flow. It is also easy to cut fiber under a weak external force. From the viewpoint, the single fiber fineness is more preferably 2 dtex or more and 10 dtex or less, and even more preferably 3 dtex or more and 6 dtex or less.

The fibrous composite fiber of the present invention preferably has a flat shape in fiber cross section. The maximum thickness (see below (measurement of flattening ratio)) is 1 μm or more and 10 μm or less. If the maximum thickness is 1 μm or more, in the production of a nonwoven fabric using a fibrillated composite fiber, there are few single fiber breaks in a carding step of forming a net that contacts a high-pressure columnar water flow, so the carding step passes It has good properties, and if it is 10 μm or less, the fiber-cutting composite fiber is easily cut even under a weak external force of a high-pressure columnar water flow. From the viewpoint, the length of the maximum thickness is more preferably 3 μm or more and 8 μm or less. In addition, the net means a plurality of short fibers are gathered or laminated randomly to form a sheet.

The fibrous composite fiber of the present invention preferably has a single fiber elongation of 10% to 50%. If the elongation of the single fiber is 10% or more, the fiber-cutting composite fiber has fewer single fiber breaks in the carding step, so the carding step has good passability. If the elongation of the single fiber is 50% or less, Fiber-cutting composite fiber is also easy to cut fiber under the weak external force of high pressure columnar water flow. From this viewpoint, the elongation of the single fiber is more preferably from 20% to 40%, and even more preferably from 25% to 35%.

The fiber-cutting composite fiber of the present invention preferably has a single fiber strength of 1 cN / dtex or more and 3 cN / dtex or less. If the single fiber strength is 1 cN / dtex or more, there will be less breakage in the single fiber when the fibrous composite fiber is used to form a non-woven fabric, so the carding step will pass well. If the single fiber strength is 3 cN / dtex or less, It is easy to cut fiber under the weak external force of high pressure columnar water flow. The single fiber strength is more preferably 1.5 cN / dtex or more and 2.5 cN / dtex or less.

The fibrous composite fiber of the present invention is preferably cut to a fiber length of 25 mm to 150 mm. If the fiber length of the fibrous composite fiber is 25 mm or more, the mesh is easy to be connected during the carding step, so the step passability is good. If the fiber length of the fibrous composite fiber is 150 mm or less, the generation of nep is reduced. In addition, it is easy to obtain a good-quality net, and the fibrous composite fibers are easily entangled with each other, and the strength of the nonwoven fabric is easily obtained. From such a viewpoint, the fiber length of the fibrous composite fiber is more preferably 30 mm or more and 120 mm or less, and even more preferably 35 mm or more and 80 mm or less.

The method for producing the fibrous composite fiber of the present invention is a method in which a solution in which component A, which is an acrylonitrile-based polymer, is dissolved in solvent C, and component B, which is incompatible with component A, is dissolved in solvent C. The mixed solution is prepared by mixing the mass ratio A / B of the component A and the component B to 90/10 ~ 60/40 to prepare a mixed solution, and the mixed solution is sprayed out of the spinning nozzle to a solution containing the solvent C. In the aqueous solution, the shape of the ejection hole is rectangular, and the ratio of the length of the rectangular long side to the length of the short side, that is, the aperture ratio (long side length / short side length) is 3 or more and 20 or less.

Moreover, the manufacturing method of the fibrous composite fiber of this invention is a method which melt | dissolved the component A which is an acrylonitrile-type polymer in the solvent C, and the component A which is incompatible with the component B in the solvent The solution in C is mixed with a mass ratio A / B of component A and component B of 90/10 to 60/40 to prepare a mixed solution, and the mixed solution is ejected from a spinning nozzle to a solvent containing In the aqueous solution of C, the shape of the ejection hole is rectangular, and the ratio of the length of the rectangular long side to the length of the short side, that is, the aperture ratio (long side length / short side length) is 3 or more. And below 20.

The method for producing a fibrous composite fiber of the present invention is preferably a solution in which an acrylonitrile-based polymer is dissolved in a solvent C and a solution in which a component that is incompatible with the acrylonitrile-based polymer is dissolved in a solvent C . By dissolving acrylonitrile-based polymer and components that are incompatible with acrylonitrile-based polymer separately in a solvent and mixing them, the number of island portions per unit fineness in the cross section of the fiber forming the sea-island structure is easy. It is 60 or more / dtex and 200 or less / dtex.

Furthermore, by mixing the component A and component B with a mass ratio A / B of 90/10 to 60/40, the number of island portions per unit fineness is likely to be 60 / dtex or more and 200 / dtex or less. .

Moreover, in the manufacturing method of the fibrous composite fiber of this invention, it is preferable that the component which is incompatible with an acrylonitrile-type polymer is selected from cellulose acetate, polyvinyl pyrrolidone, and polyvinyl chloride. The at least one component in the group is more preferably cellulose acetate.

The solvent C is not particularly limited as long as it is a solvent that dissolves the acrylonitrile polymer of the component A, and may be any of an inorganic solvent and an organic solvent. Examples of such a solvent include nitric acid (aqueous solution), zinc chloride aqueous solution, thiocyanate aqueous solution, dimethylformamide, dimethylacetamide, dimethyl sulfene, ethyl carbonate, and carbonic acid. Among propyl ester, γ-butyrolactone, acetone, and the like, dimethylacetamide is particularly preferred from the viewpoints of solubility and workability.

As long as the shape of the discharge hole of the spinning nozzle is rectangular, and the cross-sectional shape of the fiber of the cut fiber composite fiber is a flat shape with a flatness ratio of 3 or more and 20 or less Shape, the hole diameter ratio (long side length / short side length) of the ejection holes of the spinning nozzle is not particularly limited. When the hole diameter ratio of the ejection hole shape is 3 or more and 20 or less, The flattening ratio of the cross-sectional shape of the fiber tends to be 3 or more and 20 or less, so it is preferable, and the hole diameter ratio is more preferably 5 or more and 15 or less. The shape of the discharge hole of the spinning nozzle may be a flat shape. Since the expression rate of the flatness of the fiber varies depending on the manufacturing conditions such as the ejection speed and elongation of the fiber, the hole diameter of the ejection hole is preferably within the range of the hole diameter ratio according to the flatness and production of the target fiber. Conditions are appropriately selected.

The polymer concentration of the mixed solution varies depending on the solvent, and if it is an organic solvent, the solid content concentration is preferably 15% by mass or more and 30% by mass or less. When the solid content concentration is 15% by mass or more, the shape of the cross section of the fiber tends to be a flat shape, and when it is 30% by mass or less, the viscosity of the mixed solution does not become excessively high, and thus the process passability tends to be good. The solid content concentration is more preferably 18% by mass or more and 28% by mass or less, and still more preferably 20% by mass or more and 24% by mass or less.

Any of the wet spinning method, dry-wet spinning method, and dry spinning method can be used for the manufacturing method of the fibrous composite fiber of the present invention. Among them, the wet spinning method has a rapid solidification of the mixed solution. Further, it is preferable that the fiber cross section is easily formed into a flat shape. In addition, the wet spinning method is preferable because it is easy to form a plurality of wrinkles on the fiber surface and it is easy to cut the fiber.

As the coagulation solution when the wet spinning method or the dry-wet spinning method is used, an aqueous solution using the same solvent as the solvent used in the mixed solution is preferably used. The temperature of the coagulating solution is preferably 20 ° C to 60 ° C, and the solvent concentration is preferably 20% by mass. Above 60% by mass of aqueous solution. If the temperature and concentration of the coagulation liquid are within the above ranges, the coagulation of the mixed solution will not be too slow, and it will be difficult to form dense fibers, so it will be easy to cut the fiber. In addition, the coagulation will not be too fast, and it will be difficult to form excessive wrinkles on the fiber surface The pleated structure is preferable because it can maintain a flat fiber shape. The coagulation liquid is more preferably a temperature of 30 ° C. or higher and 50 ° C. or lower, and a solvent concentration of 30% by mass or more and 50% by mass or less.

The mixed solution was used as a spinning dope, and a spinning nozzle having a rectangular orifice shape was sprayed into the coagulation solution to form an undrawn yarn shaped into a fiber form. The undrawn yarn was washed in boiling water, and at the same time Extend to 3 to 7 times. When the draw ratio is 3 times or more, the mechanical strength of the obtained fiber is not reduced, and the textile property and the durability of the product are improved. In addition, if the stretching ratio is 7 times or less, step failures such as broken ends are less likely to occur. The obtained drawn yarn is subjected to oil treatment, drying, tempering heat treatment, and the like by a conventional method.

Furthermore, in the method for producing a fibrous composite fiber of the present invention, functional materials such as fluorine-based compounds, antifouling properties, antibacterial properties, and the like can be imparted to coagulated yarns, washing yarns, or drawn yarns before drying and densification. A substance such as an amine compound or a natural substance such as chitin or chitosan.

Further, in the method for producing a fibrous composite fiber of the present invention, the fibrous composite fiber obtained as described above may be subjected to an alkali treatment, and all or a part of the cellulose acetate in the island may be celluloseized. . In this case, a fiber-cutting composite fiber having a structure in which all or a part of cellulose acetate becomes a celluloseized island portion and an acrylonitrile-based polymer becomes a sea portion can be obtained.

The alkali treatment can be performed using a tow dyeing machine, a cotton dyeing machine, a cheese dyeing machine, a skein dyeing machine, or the like. Regarding the alkali treatment conditions, for example, if the island portion is cellulose diacetate, the fiber-cutting composite fiber is immersed in a caustic soda aqueous solution having a concentration of 12% by mass and a temperature of 60 ° C. for about 30 minutes. According to this alkali treatment, in the fibrous composite fiber of the present invention, all of the cellulose diacetate in the island portion is celluloseized to become a composite fiber having a composite structure in which cellulose is an island portion and acrylonitrile-based polymer is a sea portion. Regarding the alkali treatment conditions, alkalis such as caustic soda, concentration, temperature, time, etc. may be changed according to the purpose of use.

Next, a nonwoven fabric using the fibrous composite fiber of the present invention will be described.

The nonwoven fabric of the present invention is a nonwoven fabric containing fibrous composite fibers, and may also contain other fibers. The non-woven fabric of the present invention has a fiber-cutting portion that cuts fiber-cutting composite fibers to form ultrafine fibers, and the fibers in the fiber-cutting portion have a fiber width in a range of 0.01 μm to 1 μm.

Compared with the fineness of the finest portion of the fibrillated fiber described in Patent Document 1 described above after the fiber is 0.1 dtex (3 μm), the fiber of the fiber cut portion of the nonwoven fabric of the present invention has a fiber width of Finer fibers of 0.01 μm or more and 1 μm or less.

The fiber cutting portion of the non-woven fabric of the present invention is a portion formed by contacting a high-pressure columnar water flow to a net during the manufacture of the non-woven fabric. The fiber before the high-pressure columnar water contact is cut to a degree that does not leave the original shape, and becomes extremely fine fibers. In addition, in the fiber cutting section In the cellulose acetate and / or cellulose main body, ultrafine fibers having low to high hydrophilicity are mixed with hydrophobic ultrafine fibers of acrylonitrile-based polymer.

It is preferable that the fiber of the fiber cutting part of the nonwoven fabric of this invention is a fiber which has a fiber width of 0.01 micrometer or more and 1 micrometer or less. When the fiber width is 0.01 μm or more, it is difficult to cut the fiber portion after being cut, and when it is 1 μm or less, good wiping properties are easily obtained. The fiber width is more preferably 0.1 μm or more and 0.8 μm or less, and still more preferably 0.2 μm or more and 0.5 μm or less.

The non-woven fabric having a cutting portion containing ultrafine fibers like this has good wiping performance. Therefore, the nonwoven fabric using the fibrous acrylic fiber of the present invention has both hydrophilic and lipophilic properties. By having ultrafine fibers having a fiber width of 0.01 μm or more and 1 μm or less, water- and oil-based dirt and fine particles can be obtained. Excellent wiping performance in terms of absorbing dirt.

The nonwoven fabric of the present invention preferably contains the fibrous composite fiber of the present invention having a fiber length of 25 mm or more and 150 mm or less. When the fiber length is 25 mm or more and 150 mm or less, entanglement is easy, and the strength of the nonwoven fabric is easily obtained sufficiently. The fiber length is more preferably 30 mm or more and 120 mm or less, and even more preferably 35 mm or more and 80 mm or less.

The non-woven fabric of the present invention preferably contains 20% by mass or more of the fissionable composite fiber of the present invention, and more preferably contains 40% by mass or more of the fissionable composite fiber of the present invention. When the content is 20% by mass or more, a fiber-cut portion with improved wiping properties can be sufficiently obtained in a nonwoven fabric. As long as the physical properties of the nonwoven fabric are not a problem, the content of the fibrous composite fiber of the present invention is preferably high. The nonwoven fabric of the present invention may contain Other raw materials for obtaining the physical properties necessary for nonwovens.

The non-woven fabric of the present invention has fiber cutting portions in an arbitrary range of 5 mm × 5 mm on the surface of the non-woven fabric, and uniformly has fiber cutting portions in the entire non-woven fabric. Therefore, the wiping property is improved, which is preferable.

The nonwoven fabric of the present invention preferably has a basis weight of 30 g / m ² or more and 150 g / m ² or less. If it is the range of the said basis weight, the strength of a nonwoven fabric becomes sufficient, it can be used repeatedly, and the unit price of a raw material also becomes low. The basis weight is more preferably 40 g / m ² or more and 100 g / m ² or less. It is more preferably 45 g / m ² or more and 75 g / m ² or less.

The other fibers contained in the nonwoven fabric of the present invention are not particularly limited as long as they are applicable to nonwoven fabric manufacturing equipment, and examples thereof include acrylic fibers, polyester fibers, polyamide fibers, polyvinyl alcohol fibers, and polymer fibers. Synthetic fibers such as olefin fibers, chemical fibers such as rayon, cellulose acetate fibers, and copper ammonia fibers, and natural fibers such as cotton, linen, wool, and silk are preferably used in accordance with the purpose of the nonwoven fabric. For example, in terms of enhancing the effect, when the object to be wiped is oily soil, it is preferable to include lipophilic synthetic fibers in the nonwoven fabric of the present invention, and when the object to be wiped is watery soil such as mud stains or sweat, It is preferable that hydrophilic chemical fibers or natural fibers are contained in the nonwoven fabric of the present invention.

The manufacturing method of the nonwoven fabric of this invention is demonstrated.

The nonwoven fabric of the present invention can be used in a dry method and a wet method. The so-called dry method refers to a method of using a carding machine to arrange short fibers (fiber length 15 mm to 100 mm) in a certain direction and a method called air lay using random lamination of air flow, and is made of Sheets of single fibers called nets are laminated and flowed by liquid Or a method in which airflow imparts a weak external force to the web to entangle the fibers with each other to make a non-woven fabric.

In addition, the so-called wet method refers to dispersing short fibers (fiber length 6 mm or less) in water and picking them up on a net-like net to form a paper-like material called a fleece. A method of drying the fiber web to form a nonwoven fabric. In the wet method, the short fibers can be subjected to a whipping treatment when dispersed in water, thereby applying a higher external force with a higher columnar water flow to the fibrous composite fiber.

The fiber-cutting composite fiber of the present invention is suitable for a method of making a non-woven fabric by the wet method because the fiber-cutting is performed with a weak external force of a high-pressure columnar water flow, and then the method will be specifically described.

In the production of a web containing the fibrous composite fiber of the present invention, a combing card, a random carding, an air-laid method, a papermaking method, or the like can be used. When the fiber length of the fibrous composite fiber is relatively long, it is preferable to use a combing card or a random card to make the web.

The lamination is preferably performed so that the basis weight of the web becomes 30 g / m ² or more and 150 g / m ² or less. If the basis weight is 30 g / m ² or more, the strength of the non-woven fabric is increased and the handleability of the woven cloth is improved. If the basis weight is 150 g / m ² or less, the net can be entangled as a whole, and also in the thickness direction It is easy to cut the fiber-cutting composite fiber uniformly.

Then, the obtained net was placed on a woven net, and a high-pressure columnar water flow was applied to the net, and the net was transferred to a place where fibers were entangled with each other and a fiber-cutting composite fiber was cut. The high-pressure columnar water flow is ejected from a plurality of ejection outlets arranged in a direction perpendicular to the conveying direction of the net.

The fiber cutting process of the fiber-cutting composite fiber is to place a net on a stationary or moving metal or resin woven net, and contact the net with a high-pressure columnar water jet sprayed from a jetting outlet. The diameter, number, and arrangement of the nozzles that jet the high-pressure columnar water flow are not particularly limited as long as the fiber width of the fiber-cutting composite fiber of the present invention is fiber-cut to a range of 0.01 μm or more and 1 μm or less. In addition, the fiber cutting process using a high-pressure columnar water flow can be repeated, or the unit of the nozzle can be set in multiple stages and set to a repeated process or a multi-stage process that changes the water pressure.

The water pressure of the high-pressure columnar water flow applied to the net is preferably 5 MPa or more and 30 MPa or less. If the water pressure is 5 MPa or more, the fiber-cutting composite fiber is sufficiently cut, and if it is 30 MPa or less, cutting of the fiber after cutting or occurrence of holes in the nonwoven fabric can be reduced. From the viewpoint, the water pressure is more preferably 7 MPa or more and 15 MPa or less.

It is preferable to arrange a plurality of rows of ejection outlets arranged to eject the high-pressure columnar water flow so that the high-pressure columnar water flow contacts the net multiple times. By contacting the high-pressure columnar water flow with the net multiple times, it is easy to cut the fiber width of the fibrous composite fibers in the net to a range of 0.01 μm to 1 μm, and it is easy to obtain uniform and uniform cuts in the entire net. Fiber Department.

The fiber-cutting treatment of the fiber-cutting composite fiber is preferably performed so that the distance from the ejection port where the high-pressure columnar water jet is ejected to the web is 10 mm or more and 100 mm or less. If the distance is 10 mm or more, it is difficult for the ejection port to contact the net, so it is difficult to disturb the state of the net. If it is 100 mm or less, it is easy to sufficiently apply the external force necessary for cutting the fiber, so that the fiber can be easily and sufficiently cut. The distance is more preferably 15mm or more and 50mm Hereinafter, it is more preferably 15 mm or more and 35 mm or less.

In addition, the diameter of the ejection port for ejecting the high-pressure columnar water flow is preferably 80 μm or more and 200 μm or less. If it is 80 μm or more, the high-pressure columnar water flow is difficult to pass through the net, so it is difficult to produce non-woven holes. If it is 200 μm or less, the external force necessary for fiber cutting is easily increased, and the fiber-cutting composite fiber is easy to fiber. From the viewpoint, the diameter is more preferably 100 μm or more and 180 μm or less, and still more preferably 120 μm or more and 160 μm or less.

Next, the speed of the transfer web when the fiber-cutting composite fiber is cut is preferably 5 m / min or more and 50 m / min or less. If the speed is 5 m / min or more, the productivity is good, and if it is 50 m / min or less, the high-pressure columnar water flow can sufficiently contact an arbitrary point, and the fiber is easily cut. The speed is more preferably 10 m / min or more and 40 m / min or less, and even more preferably 15 m / min or more and 30 m / min or less.

In addition, when the non-woven fabric contains other fibers in addition to the fibrous composite fiber, the fibrous composite fiber and other fibers are mixed by an arbitrary mixing method to form a net, and a high-pressure columnar water current is brought into contact with the net to convert the The fiber-cutting composite fiber is cut and integrated into a non-woven fabric.

Next, the wiping cloth containing the nonwoven fabric of this invention is demonstrated.

Wipe cloths made of non-woven fabrics using ultrafine fibers have been widely known. Wipe cloths of a dry sheet type or a wet sheet type are known. The dry sheet wipes are charged by the friction between the ultra-fine fibers forming the sheet and the surface to be wiped, thereby adsorbing dust or filaments and entanglement to capture the fibers. On the other hand, wet wipes are made of cellulose fibers such as cotton, rayon, and cupra. The dirt formed on the floor is wiped off with water or a lotion or wax impregnated in the sheet.

The wiping cloth including the nonwoven fabric of the present invention may be a dry sheet type or a wet sheet type. The wiping cloth of the present invention contains ultrafine fibers having a fiber width in a range of 0.01 μm to 1 μm. The ultra-fine fibers containing the fiber width increase the contact area with dirt such as dust and grease in the case of a dry sheet type. By utilizing the adsorbed dirt capture or peeling off of the dirt film, it is more excellent than before. Wiping performance. In addition, the wiping cloth of the present invention contains cellulose acetate and / or fiber-cutting composite fibers of cellulose and acrylonitrile-based polymer. Therefore, the wet type of the cellulose-based fiber also exhibits excellent wiping performance. The wiping cloth of the present invention not only has excellent wiping performance, but also does not require special techniques or steps when manufacturing a non-woven fabric, and thus can be obtained at a lower cost than conventional wiping cloths using ultrafine fibers.

[Example]

Hereinafter, the present invention will be specifically described by way of examples. The measurement of each item in the examples is based on the following method.

(Method for measuring flatness)

About 200 fiber-cut composite fibers were put into a polyethylene tube with an inner diameter of 1 mm, and then the hot air of a dryer was blown to shrink the polyethylene tube until the fiber-cut composite fiber bundle did not fall out. degree. Here, the polyethylene pipe is a one that shrinks only in the circumferential direction.

Then, the polyethylene tube stuffed with the cut fibrous composite fibers was cut with a blade of an unused razor in a direction substantially perpendicular to the axial direction to make a length of about 1 cm. degree.

One of the cut surfaces was fixed on a stage with a double-sided tape, and a low-temperature ion sputtering apparatus (manufactured by Japan Electronics Co., Ltd., JFC-1100) was used at 1200 V-5 mA for 10 minutes at Gold was vapor-deposited on the cut surface of the cut fiber composite fiber as the observation surface on the other side of the cut surface to prepare a sample.

Using a scanning electron microscope (S-3500N, manufactured by Hitachi, Ltd.), observe the fiber cross section of the fiber-cut composite fiber of the sample at a magnification of 500 times, and bend the flat shape due to external force when putting it into a tube Except, 25 fiber-cut composite fibers were selected, the longest length in the fiber cross section was set to the maximum width, and the longest length in the thickness direction orthogonal to the maximum width direction was set to the maximum thickness, and the respective maximum widths were measured. And maximum thickness, the maximum width / maximum thickness is used as the flattening ratio. The flatness ratio of the fiber cross section of 25 cut fiber composite fibers was calculated, and the average value of the flatness ratio was used.

(Determination of single fiber fineness)

The fibrous composite fiber was allowed to stand in an environment of a temperature of 25 ° C and a humidity of 65% for 60 minutes, and then an autovibro-type fineness tester (Denior Computer DC-11 manufactured by Search Control Electric Co., Ltd.) was used at The measurement was performed under the conditions of a temperature of 25 ° C and a humidity of 65%. The measurement was performed on 25 fibrous composite fibers, and the average value was used.

(Number of island parts per unit fineness)

A sample was prepared by the same method as the method for measuring the flatness ratio. Observe the fiber cross section of three fiber-cut composite fibers at a magnification of 500 times. The number of island portions in the middle is counted, and the number of island portions per unit fineness is obtained by dividing the number of island portions by the single fiber fineness. This measurement was performed on three fibrous composite fibers, and the average value was used.

(Cutability evaluation)

The non-woven fabric obtained in each example was cut into a size of 5 mm × 5 mm, and was fixed on a stage with a double-sided tape. JFC-1100 (low-temperature ion sputtering device) manufactured by Japan Electronics Co., Ltd. was used at 1200 V-5 mA, Gold was vapor-deposited on the surface of the non-woven fabric on the observation side for 10 minutes to prepare a sample. A scanning electron microscope (S-3500N, manufactured by Hitachi, Ltd.) was used for observation at a magnification of 100 times. The surface was observed at five places, and the fibrous properties were determined based on the following criteria.

○: It was confirmed that at least one of the five samples had a portion cut to such an extent that no fiber prototype remained, as shown in Part D of FIG. 1.

×: In all 5 samples, as shown in part E of FIG. 2, it was confirmed that there was no portion cut to the extent that no fiber prototype was left, and the prototype was almost completely retained.

(Fiber width of cut fiber (maximum width and minimum width))

Samples were prepared by the same method as the fibrous evaluation. The produced nonwoven fabric was observed under a scanning electron microscope at a magnification of 100 times, and a fiber cutting portion was selected. The cut section was observed at 1500 times, and the thickest and finest fibers were selected from the cut fibers, and the selected fiber was taken at 8000 times to enlarge the photo, and the width of the fiber was measured. Here, the fiber width means a length in a width direction that is at a right angle to the length direction of the fiber.

This measurement was performed on 10 fiber-cut sections, and the average value was used.

(Wiping)

The raw liquid of Mat Hydrated Pigment (Blue) manufactured by Sakura Color Products was mixed with water at a mass ratio of 1: 1 to make an aqueous stain, and the water was absorbed by a Pasteur pipette For dirt, use a Pasteur pipette to attach one drop to the inside of a slide glass with a width of 25 mm, a length of 75 mm, a thickness of 1 mm, and a mass (W ₀ ) of 10 mm or more from one end. The total mass (W ₁ ) g of the water-based dirt. The water-based dirt on the glass slide was about 10 mm in diameter. Immediately thereafter, a non-woven fabric cut into 2 cm × 2 cm was loaded with a load of 200 g as a whole, and the non-woven fabric was transferred on a glass slide at a speed of 1 m / min while the non-woven fabric was passed on the water-based dirt, and the dirt was wiped. Then, the mass (W ₂ ) g of the slide glass after wiping was measured. The mass ratio of the wiped off water stain was calculated from the following formula, and the wiping property was obtained from the obtained value.

Mass proportion of wiped off water-based dirt (%) = [1- (W ₂ -W ₀ ) / (W ₁ -W ₀ )] × 100

The wiping property evaluation is based on the following criteria to determine the mass ratio (%) of the dirt removed.

Level 5: 99% or more, Level 4: 98% or more and less than 99%, Level 3: 97% or more and less than 98%, Level 2: 96% or more and less than 97%, Level 1: less than 96%

(Compatibility confirmation method)

Acrylonitrile-based polymer is mixed so that the solid content concentration becomes 20% by mass It was dissolved in dimethylacetamide and heated to 80 ° C to prepare a 200 cc solution. In addition, the other component was mixed with dimethylacetamide so that the solid content concentration became 20% by mass, and heated to 80 ° C. to dissolve it to prepare a 200 cc solution. The two solutions were put into a container together, and were prepared by stirring a three-one motor (manufactured by Iuchi Co., Ltd., SCR-100) at 25 ° C for 30 minutes at a speed of 600 rpm. Into a mixed solution. About 5 g of the mixed solution was placed on a glass slide, and observed using a light microscope at a magnification of 200 times. If it is incompatible, the interface can be observed.

(Example 1)

As component A, an acrylonitrile polymer (component A1) was obtained by a known aqueous suspension polymerization method so that the acrylonitrile unit and the vinyl acetate unit had the composition ratio shown in Table 1. The component A1 was mixed into dimethylacetamide (solvent C) so that the mass ratio of the component A1 became 24% by mass, and heated to a temperature of 80 ° C to obtain a solution P in which the component A1 was dissolved in the solvent C. As component B, cellulose diacetate (component B1) having an average degree of acetylation of 55.2% was mixed into dimethylacetamide (solvent C) so that the mass ratio of component B1 was 18% by mass, and heated to A solution Q in which component B1 was dissolved in solvent C was obtained at 80 ° C.

The solution P and the solution Q were mixed such that the mass ratio of the component A1 and the component B1 was 70/30, and the components A1 and B1 were uniformly mixed to prepare a mixed solution. From the rectangular-shaped ejection holes having a ratio of the length of the long side to the length of the short side, that is, an aperture ratio of 10, the mixed solution was ejected at a ejection line speed of 30 m / min to a temperature of 40 ° C and dimethylacetamide. In a coagulation solution of an aqueous solution having a concentration of 35% by mass, coagulated silk is prepared. The solvent in the coagulated silk is washed three times in boiling water, and an oil agent is added. Then, a drying and relaxation heat treatment is performed at 150 ° C. A fibrous composite fiber was obtained. The obtained fibrous composite fiber was cut to a fiber length of 40 mm.

As shown in Table 2, the single fiber fineness of the obtained cut fiber composite fiber was 3.3 dtex, and the fiber cross-section was a flat shape with a flatness ratio of 7. The acrylonitrile-based polymer was formed in the fiber cross-section as the sea part, and As shown in Table 3, the composite structure of the island has excellent fiber-cutting properties.

The fibrous composite fiber cut into a fiber length of 40 mm was combed through a card to obtain a web. This web was placed on a weaving web transferred at 20 m / min. A high-pressure columnar water flow with a water pressure of 10 MPa was sprayed from the discharge port with a discharge port diameter of 150 μm to the transferred net, so that the high-pressure columnar water contacted the network. The distance from the nozzle to the net was set to 30 mm. While cutting the fiber-cutting composite fibers in the net with high-pressure columnar water flow, the fiber-cutting composite fibers are entangled. Then, it dried at 110 degreeC for 3 minutes, and obtained the nonwoven fabric with a basis weight of 50 g / m <^2> .

In this non-woven fabric, the fiber-cutting composite fiber is subjected to fiber-cutting, and the fiber-cutting fibers in which ultrafine fibers having an acrylonitrile-based polymer main body and ultrafine fibers having cellulose diacetate are mixed are shown in Table 2. The non-woven fabric has a fiber cutting portion including ultrafine fibers having a maximum width of 3.8 μm and a minimum width of 0.02 μm, and the nonwoven fabric has an excellent wiping property as shown in Table 3.

(Example 2)

In Example 1, the mass ratio of the acrylonitrile polymer (component A1) and the cellulose diacetate (component B1) in the mixed solution was changed, and the acrylonitrile in the fiber-cut composite fiber was changed as shown in Table 1. Except for the mass ratio of the polymer (component A1) and the cellulose diacetate (component B1), cut fiber composite fibers and nonwoven fabrics were produced in the same manner as in Example 1. The properties of the fibrous composite fiber and the non-woven fabric are shown in Tables 2 and 3.

(Example 3)

A fibrillable composite fiber and a nonwoven fabric were produced in the same manner as in Example 1, except that the component B was changed to polyvinylpyrrolidone (manufactured by Nippon Catalytic Corporation, PVP K-79) shown in Table 1. The properties of the fibrous composite fiber and the non-woven fabric are shown in Tables 2 and 3.

(Example 4)

Except having changed the component B into the polyvinyl chloride (made by Mitsubishi Chemical Corporation, SG-1100) shown in Table 1, it carried out similarly to Example 1, and produced the fibrous composite fiber and nonwoven fabric. The properties of the fibrous composite fiber and the non-woven fabric are shown in Tables 2 and 3.

(Example 5 to Example 7)

A fibrous composite fiber and a nonwoven fabric were produced in the same manner as in Example 1 except that the content ratio of the fibrous composite fiber in the nonwoven fabric was changed as shown in Table 3. The properties of the fibrous composite fiber and the non-woven fabric are shown in Tables 2 and 3.

For the fibers other than the fibrous composite fiber of the present invention in the nonwoven fabric, an acrylic fiber having a single fiber fineness of 1.0 dtex and a fiber length of 40 mm was used.

(Example 8)

Except that the shape of the discharge hole of the spinning nozzle at the time of spinning was changed to obtain a fibrous composite fiber having a flattening ratio of 13 in the fiber cross section, a fibrous composite fiber and a nonwoven fabric were produced in the same manner as in Example 1. The shape of the discharge hole of the spinning nozzle at the time of spinning, the flatness of the fiber cross section of the obtained fiber-cutting composite fiber, the fiber-cutting property, and the maximum width and minimum width of the fiber to be cut in the fiber-cutting portion of the nonwoven fabric, The wipeability is shown in Tables 2 and 3.

(Comparative Example 1 to Comparative Example 3)

Except that the mass ratio of the acrylonitrile polymer as the component A1 to the cellulose diacetate as the component B1 and the shape of the orifice of the spinning nozzle in the mixed solution were changed as shown in Table 2, it was produced in the same manner as in Example 1. Composite fiber and non-woven fabric. None of the composite fibers obtained in Comparative Example 1 to Comparative Example 3 had a flat fiber cross section. The fiber-cutting properties and wiping properties of the composite fibers obtained in Comparative Examples 1 to 3 are shown in Table 3. However, all of the obtained composite fibers were not fiber-cut.

(Comparative Example 4)

In addition to changing the acrylonitrile polymerization as the component A in the fiber as shown in Table 1, Except for the mass ratio of the product and cellulose diacetate as component B, acrylic fibers and nonwoven fabrics were produced in the same manner as in Example 1. Although the cutting property and wiping property of the obtained acrylic fiber are shown in Table 2, the obtained acrylic fiber was not cut at all.

[Industrial availability]

The fiber-cutting composite fiber of the present invention cuts the fiber by using a weak external force of a high pressure columnar water flow used in the entanglement treatment of the water-sprayed fibers, and the fiber after the fiber cutting is extremely fine, thereby exhibiting excellent performance when it is made into a nonwoven Therefore, the non-woven fabric of the present invention is useful as a raw material of a non-woven fabric having a good fluffy texture and having a bulky feel, and the non-woven fabric of the present invention is useful as a cloth-like and excellent wiping fabric.

In addition, the fibrous composite fiber of the present invention is produced by a wet spinning method that is the same as a normal acrylic fiber manufacturing method without using a special spinning method. The fibrous fiber can also be used in the production of a nonwoven fabric. It is performed during the entanglement treatment of the high-pressure columnar water flow, so the fibrous composite fiber, the non-woven fabric, and the wiping cloth can be obtained inexpensively.

Claims (15)

A fiber-cutting composite fiber which is a fiber containing a component A of 60% by mass or more and 90% by mass or less and a component B of 10% by mass or more and 40% by mass or less, and the component A and the component B are Incompatible, the component A or the component B is composed of an acrylonitrile-based polymer, and the shape of the fiber cross section perpendicular to the fiber axis is a flat shape with a flatness ratio of 3 or more and 20 or less. The component A is a composite structure of a sea part and the component B is an island part, wherein the number of island parts per unit fineness is 60 or more / dtex and 130 or less / dtex. The fissionable composite fiber according to item 1 of the scope of the patent application, which is the component A containing 60% by mass to 90% by mass of the component A, and 10% by mass to 40% by mass of the component B. Fiber, and the component A and the component B are incompatible, and the component A is composed of an acrylonitrile-based polymer, and the shape of the fiber cross section perpendicular to the fiber axis is a flattening ratio of 3 or more and A flat structure of 20 or less, and a composite structure in which the component A is a sea portion and the component B is an island portion. The fiber-cutting composite fiber according to item 1 of the scope of patent application, wherein the component that is incompatible with the component of the acrylonitrile-based polymer is selected from cellulose acetate, polyvinylpyrrolidone, polyvinyl chloride, And at least one component of a group of celluloses in which cellulose acetate is alkali-treated. The fibrous composite fiber according to item 1 of the scope of patent application, wherein the single fiber fineness is 1 dtex or more and 20 dtex or less. The fibrous composite fiber according to item 1 of the scope of patent application, wherein the maximum thickness of the flat shape is 1 μm or more and 10 μm or less. The fibrous composite fiber according to item 1 of the scope of patent application, wherein the single fiber elongation is 10% or more and 50% or less. A method for manufacturing a fibrous composite fiber, wherein a solution in which component A is dissolved in solvent C and a solution in which component B is dissolved in solvent C are mixed to form a mixed solution, wherein the component A is an acrylonitrile-based Polymer, the component B is incompatible with the component A, and the mass ratio A / B between the component A and the component B is 90/10 ~ 60/40 or 10/90 ~ 40/60, The mixed solution is sprayed out of a spinning hole of a spinning nozzle into an aqueous solution containing the solvent C. The shape of the jetting hole is rectangular, and the ratio of the length of the long side to the length of the short side of the rectangle is The aperture ratio (long-side length / short-side length) is 3 or more and 20 or less. Among the fiber sections perpendicular to the fiber axis of the single fiber, the number of island portions per unit fineness is 60 / dtex and 130 or more / dtex or less. The method for manufacturing a fibrous composite fiber according to item 7 in the scope of the patent application, wherein the solid content concentration of the mixed solution is 15 mass% or more and 30 mass% or less, and the concentration of the solvent C in the aqueous solution is 20 mass % Or more and 60 mass% or less, and the temperature is 20 ° C or more and 60 ° C or less. The method for producing a fiber-dissipative composite fiber according to item 7 of the scope of the patent application, wherein the component that is incompatible with the acrylonitrile-based polymer is selected from the group consisting of cellulose acetate, polyvinylpyrrolidone, and polyvinyl chloride. At least one ingredient in the group. A non-woven fabric containing the fiber-cutting composite fiber according to item 1 of the scope of the patent application, and having a fiber-cutting portion through which the fiber-cutting composite fiber is cut, the fiber-cutting portion having a fiber width of 0.01 μm or more and 1 μm or less. The non-woven fabric according to item 10 of the scope of patent application, wherein the fiber length of the fibrous composite fiber is 25 mm or more and 150 mm or less, and the content of the fibrous composite fiber is 20 mass% or more and 100 mass% or less . The nonwoven fabric according to item 10 of the scope of patent application, wherein the fiber cutting portion is provided in an arbitrary range of 5 mm × 5 mm on the surface of the nonwoven fabric. A method for manufacturing a non-woven fabric, which manufactures the non-woven fabric according to item 10 of the scope of patent application, and in the method for manufacturing the non-woven fabric, the high-pressure columnar fluid ejected from the ejection outlet is contacted with The fiber-reinforced composite fiber web is subjected to fiber-cutting treatment, and the pressure of the high-pressure columnar fluid is 5 MPa or more and 30 MPa or less, from the ejection port of the high-pressure columnar fluid to the The distance to the surface of the screen is 10 mm or more and 100 mm or less. The method for manufacturing a non-woven fabric according to item 13 of the scope of patent application, wherein the diameter of the ejection outlet from which the high-pressure columnar fluid is ejected is 80 μm or more and 200 μm or less, The transfer speed of the net is 5 m / min or more and 200 m / min or less. A wipe includes a non-woven as described in item 10 of the scope of patent application.