JP4722881B2 - Synthetic fiber bundle and method for producing synthetic fiber bundle - Google Patents

Description

The present invention relates to a synthetic fiber bundle (hereinafter abbreviated as “fiber bundle”) used for wigs, hair pieces, blades, extension hairs, doll hairs, and the like, and a method for producing the same.

Synthetic fibers generally used for hair include vinyl chloride fiber, polyester fiber, nylon fiber and the like. When these fibers are used to process hair decoration products such as wigs, hairpieces, and blades, the cross-sectional shape of the fibers has been improved for the purpose of producing a texture similar to natural hair. For example, a method for manufacturing a fiber having a cross section with a protrusion having a Y-shaped cross section (for example, see Patent Document 1) and a method for manufacturing a fiber having a C-shaped cross section (for example, refer to Patent Document 2) are proposed. Has been.
Japanese Utility Model Publication No. 58-37961 JP 2003-96618 A

However, softness is improved in a cross-sectional shape close to a circle, but there are cases where there is a problem with bulkiness. Also, bulkiness is improved with a hollow or semi-hollow cross-sectional shape, but there is a problem with softness. was there. An object of the present invention is to provide a fiber bundle excellent in curling property, curl retention and flexibility.

That is, the present invention has the following gist.

A mixed synthetic fiber bundles out with fibers (B) of the fibers (A) and the vinyl chloride resin composition of the vinyl chloride resin composition,
The cross-sectional shapes of the fiber (A) and the fiber (B) are a saddle type, a Y type, a triple dumpling type, a deformed cross type, a C type, and a modified C type, respectively, and the fiber (A) and the fiber (B ) With a mass ratio of fiber (B) / fiber (A) = 1.0 to 6.5 The minimum of the section moment about the axis passing through the centroid of the fiber cross section of the fiber (A) Value (I _min ) of 0.4 × 10 ⁻⁶ mm ^{4 to} 1.8 × 10 ⁻⁶ mm ⁴ , and the minimum value of the cross-sectional secondary moment about the axis passing through the centroid of the fiber cross section of the fiber (B) _{(I min)} is ^{2.0 × 10 -6 mm 4 ~7.5 ×} 10 -6 mm 4, a is synthetic fiber bundles.
(2) The synthetic fiber bundle according to (1), wherein the average fineness is 30 to 100 dtex.
(3) A fiber bundle for hair decoration comprising the synthetic fiber bundle according to (1) or (2) .
(4) A fiber bundle for hair decoration comprising the synthetic fiber bundle according to (3).

According to the present invention, it is possible to obtain a fiber bundle excellent in curling property, curl holding property and flexibility.

The fiber bundle of the present invention is obtained by mixing two or more types of single fibers having different minimum values (I _min ) of cross-sectional second moments with respect to the axis passing through the centroid of the fiber cross section. It has been found that a fiber bundle excellent in flexibility can be obtained.

The minimum value of the second moment about the axis passing through the centroid of the fiber cross-section and the (I _min), 2 single spindle through the figure heart (short axis, long axis) minimum value of the second moment about the (I _min ). For example, when the fiber cross section is a simple geometric figure, and the ellipse has a major axis 2a and a minor axis 2b, the maximum value of the cross-section secondary moment (I _max ) is πb ³ a / 4, and the minimum value of the cross-section secondary moment (I _min ) is obtained by πa ³ b / 4.

In the present invention, the minimum value (I _min ) of the secondary moment of section with respect to the axis passing through the centroid of the fiber cross section is measured by the following method.
1 Using a digital microscope VH-6300C manufactured by Keyence Co., Ltd., the fiber cross section is magnified 1500 times to take a photograph of the fiber cross section.
2 The minimum value (I _min ) of the cross-sectional second moment is obtained by image analysis of the cross-sectional photograph using calculation software CADSUPER FX (initial type) manufactured by Andor.

The minimum value (I _min ) of the cross-sectional second moment about the axis passing through the centroid of the fiber cross section of the fiber (A) is 0.4 × 10 ^{−6 to} 1.8 × 10 ⁻⁶ mm ⁴ , preferably 0.8. 6 × 10 ^{−6 to} 1.7 × 10 ⁻⁶ mm ⁴ . When the minimum value (I _min ) of the fiber (A) is less than 0.4 × 10 ⁻⁶ mm ⁴ , the curl property and curl retention property of the fiber bundle are deteriorated. On the other hand, when the minimum value (I _min ) of the fiber (A) exceeds 1.8 × 10 ⁻⁶ mm ⁴ , the fiber bundle is not flexible.

The minimum value (I _min ) of the second moment of section about the axis passing through the centroid of the fiber cross section of the fiber (B) is 2.0 × 10 ^{−6 to} 7.5 × 10 ⁻⁶ mm ⁴ , preferably 2. 5 × 10 ^{−6 to} 7.0 × 10 ⁻⁶ mm ⁴ . When the minimum value (I _min ) of the fiber (B) is less than 2.0 × 10 ⁻⁶ mm ⁴ , the curl property and curl retention property of the fiber bundle are deteriorated. On the other hand, if the minimum value (I _min ) of the fiber (B) exceeds 7.5 × 10 ⁻⁶ mm ⁴ , the fiber bundle becomes too stiff.

The fiber bundle is mixed with the fiber (A) and the fiber (B), and the mixing ratio is, by mass ratio, fiber (B) / fiber (A) = 1.0 to 6.5, more preferably 1. 0.0 to 4.0 are preferred. By setting the fiber (A) and the fiber (B) to the above-mentioned mixing ratio, the fiber bundle can be made flexible and curl. When the ratio is less than 1.0, the ratio of the fibers (A) in the fiber bundle is too large, and the curling property and curl retention of the fiber bundle may be deteriorated. On the other hand, when the ratio exceeds 6.5, the ratio of the fibers (B) in the fiber bundle is too large, and the flexibility of the fiber bundle may be deteriorated.

The fiber (A) and the fiber (B) are composed of at least one kind of single fibers having different fiber cross-sectional shapes. The cross-sectional shape of the fiber (A) is not particularly limited. For example, a saddle type (see FIG. 1), a triple dumpling type, and a gourd type having a small minimum value (I _min ) of the secondary moment of section is preferable. Among these, a saddle type is preferable. Examples of the cross-sectional shape of the fiber (B) include a Y-shaped (see FIG. 2), a deformed cross-shaped, an H-shaped, a C-shaped, and a tetrapot-shaped that have a large minimum value (I _min ) of the sectional secondary moment. preferable. Among them, the Y type is preferable.

The average fineness of the fiber bundle of the present invention is 30 to 100 dtex, more preferably 40 to 90 dtex, and still more preferably 50 to 80 dtex. If the average fineness of the fiber bundle is less than 30 dtex, the combing property of the fiber bundle may be deteriorated. On the other hand, if the fineness exceeds 100 dtex, the single fiber may become stiff and the appearance of the fiber bundle may deteriorate. The average fineness, select 100 monofilaments at random from the fiber bundle was calculated in terms of weight and measure "M" 10,000 m of the single fiber 1m by "M × 10 ^4/100".

As the fiber applied to the present invention, any synthetic fiber can be used, but vinyl chloride, acrylic, polyester, polypropylene, nylon, and polylactic acid are practically used. Vinyl type and acrylic type are preferred. Particularly preferred are vinyl chloride fibers in view of properties such as strength, gloss, hue, flame retardancy, feel and heat shrinkability.

Hereinafter, specific examples of the vinyl chloride fiber will be described.

As the vinyl chloride resin used for the vinyl chloride fiber, those obtained by bulk polymerization, solution polymerization, suspension polymerization, emulsion polymerization, etc. can be used. It is preferable to use those produced by turbid polymerization. The vinyl chloride resin is a homopolymer resin, which is a conventionally known homopolymer of vinyl chloride, or various conventionally known copolymer resins, and is not particularly limited. A conventionally known copolymer resin can be used as the copolymer resin. For example, vinyl chloride and vinyl ester copolymer resins such as vinyl chloride-vinyl acetate copolymer resin, vinyl chloride-vinyl propionate copolymer resin; vinyl chloride-butyl acrylate copolymer resin, vinyl chloride-2-ethylhexyl acrylate copolymer resin, etc. Typical examples include vinyl chloride and acrylate copolymer resins; vinyl chloride-ethylene copolymer resins, vinyl chloride-propylene copolymer resins and other vinyl chloride and olefin copolymer resins; vinyl chloride-acrylonitrile copolymer resins, etc. Is done. It is particularly preferable to use a homopolymer resin, a vinyl chloride-ethylene copolymer resin, a vinyl chloride-vinyl acetate copolymer resin, or the like that is a homopolymer of vinyl chloride. In the copolymer resin, the content of the comonomer is not particularly limited, and can be determined according to required qualities such as moldability and fiber characteristics. The content of the comonomer is preferably 2 to 30% by mass, particularly preferably 2 to 20% by mass.

The viscosity average polymerization degree of the vinyl chloride resin is preferably 600 to 2500, and more preferably 600 to 1800. If the vinyl chloride resin has a viscosity-average polymerization degree of less than 600, the resulting single fiber may be easily heat-shrinked when the melt viscosity is lowered. On the other hand, when the viscosity average polymerization degree exceeds 2500, the melt viscosity becomes high, so that the nozzle pressure becomes high and there is a possibility that safe production becomes difficult. The viscosity average degree of polymerization was obtained by dissolving 200 mg of resin in 50 ml of nitrobenzene, measuring the specific viscosity of this polymer solution in a constant temperature bath at 30 ° C. using an Ubbelohde viscometer, and calculating according to JIS-K6720-2. It is.

A conventionally well-known heat stabilizer can be used. Among these, it is desirable to use one or more selected from a Ca—Zn-based heat stabilizer, a hydrotalcite-based heat stabilizer, a tin-based heat stabilizer, and a zeolite-based heat stabilizer. The heat stabilizer is used to improve thermal decomposition during molding, long run property, and color tone of the filament, and particularly preferably a Ca—Zn-based heat which has an excellent balance of molding processability and yarn characteristics. A combination of a stabilizer and a hydrotalcite heat stabilizer is preferred. These heat stabilizers are preferably 0.1 to 5.0 parts by weight, more preferably 0.3 to 3.0 parts by weight, with respect to 100 parts by weight of the vinyl chloride resin. The hydrotalcite-based heat stabilizer is specifically a hydrotalcite compound, more specifically, a composite salt compound comprising magnesium and / or alkali metal and aluminum or zinc, magnesium and aluminum, There is something that has been dehydrated. The hydrotalcite compound may be a natural product or a synthetic product, and the synthesis method of the synthetic product may be a conventionally known method.

In addition to the vinyl chloride resin, conventionally known additives used for the vinyl chloride resin depending on the purpose are mixed in the resin composition for forming a fiber bundle of the present invention. For example, lubricants, compatibilizers, processing aids, reinforcing agents, ultraviolet absorbers, antioxidants, antistatic agents, fillers, flame retardants, pigments, initial color improvers, conductivity imparting agents, surface treatment agents, light There are stabilizers and fragrances.

The manufacturing method of the single fiber which comprises the fiber bundle of this invention is described. The resin composition used for the production of the single fiber is a powder compound obtained by mixing using a conventionally known mixer, for example, a Henschel mixer, a super mixer, a ribbon blender, or the like, or a melt compound thereof. It can be used as a pellet compound. The powder compound can be produced under conventional conditions known in the art, and may be hot blend or cold blend. Particularly preferably, in order to reduce the volatile content in the resin composition, the cut temperature during blending is set to 105 to It is preferable to use a hot blend that is raised to 155 ° C. The pellet compound can be produced in the same manner as in the production of a normal vinyl chloride-based pellet compound. For example, pellets using a kneader such as a single screw extruder, a different direction twin screw extruder, a conical twin screw extruder, a same direction twin screw extruder, a kneader, a planetary gear extruder, a roll kneader, etc. It can be a compound. The conditions for producing the pellet compound are not particularly limited, but it is desirable to set the resin temperature to be 185 ° C. or lower.

The vinyl chloride resin composition is made into a fibrous undrawn yarn by a conventionally known spinning method. The spinning method is not particularly limited, but the melt spinning method is preferable. When performing melt spinning, a conventionally known extruder can be used. For example, a single-screw extruder, a different-direction twin-screw extruder, a conical twin-screw extruder or the like can be used. Particularly preferably, the single-screw extruder has a diameter of about 35 to 85 mmφ, or the conical extrusion has a diameter of about 35 to 50 mmφ. It is better to use the machine. If the diameter is excessive, the amount of extrusion increases, the nozzle pressure becomes excessive, the outflow speed of the undrawn yarn is too fast, and winding may be difficult.

In the present invention, melt spinning can be performed using a conventionally known nozzle. For example, a melt-spinning can be performed by attaching a nozzle having a cross-sectional shape of a single fiber having a saddle shape substantially the same as that of a saddle shape to the tip of a die (spinning die). Considering the quality aspects such as curling characteristics for hair decoration, the vinyl chloride resin composition is formed by arranging a plurality of nozzle holes in which a cross-sectional area of one nozzle hole is 0.5 mm ² or less in a die. It is preferable to produce an undrawn yarn having a single fineness of 300 dtex or less by melting and flowing out strands from multi-type nozzle holes (the number of nozzle holes is 50 to 300; the number of nozzle arrays is 1 to 5). Specifically, an undrawn yarn is obtained by melt spinning a pellet compound or the like of the resin composition at a mold temperature of 160 to 190 ° C., more preferably 165 to 185 ° C. using, for example, a single screw extruder. . When the fineness of the undrawn yarn exceeds 300 dtex, in order to obtain a single fiber having a fineness, it is necessary to increase the draw ratio during the drawing treatment. The fiber may become glossy and it may be difficult to maintain a semi-gloss to seven-part gloss state. In melt spinning, it is preferable to perform spinning at a nozzle pressure of 50 MPa or less. When the nozzle pressure exceeds 50 MPa, the load applied to the thrust part of the extruder becomes excessive, and it is easy to cause problems in the extruder, or when "resin leakage" occurs from the connection part of the turn head, die, etc. There is.

The undrawn yarn obtained by melt spinning can be drawn and heat-treated by a known method to obtain a single fiber (drawn yarn) having a fineness of 100 dtex or less. As the stretching treatment conditions, it is particularly preferable that the stretching ratio is stretched by about 200 to 400% in an atmosphere at a stretching treatment temperature of 90 to 120 ° C. If the stretching temperature is less than 90 ° C., the strength of the single fiber is reduced and yarn breakage is liable to occur. Conversely, if the temperature exceeds 120 ° C., the tactile feel of the single fiber may deteriorate the plastic sliding feel. Further, if the draw ratio is less than 200%, the strength of the single fiber is not sufficiently developed, and if it exceeds 400%, yarn breakage may easily occur during the drawing treatment.

Furthermore, the thermal contraction rate can be lowered by subjecting the stretched single fiber to a thermal relaxation treatment in an air atmosphere maintained at a temperature of 110 to 140 ° C. until the length becomes 60 to 95% before the thermal relaxation treatment. it can. The thermal relaxation treatment can be performed in conjunction with the stretching treatment or can be performed separately. In the present invention, a conventionally known technique related to melt spinning, for example, a technique related to various nozzle cross-sectional shapes, a technique related to a heating cylinder, a technique related to a stretching process, a technique related to heat treatment, etc. are freely available. It can be used in combination.

The fiber bundle of the present invention can be produced by the method for producing a fiber bundle of the present invention. In the method for producing a fiber bundle of the present invention, the minimum value (I _min ) of the cross-sectional second moment about the axis passing through the centroid of the fiber cross section is 0.4 × 10 ⁻⁶ mm ^{4 to} 1.8 × 10 ⁻⁶ mm. The minimum value (I _min ) of the cross-sectional second moment about the fiber (A) ⁴ and the axis passing through the centroid of the fiber cross section is 2.0 × 10 ⁻⁶ mm ^{4 to} 7.5 × 10 ⁻⁶ mm ⁴ This is a method for producing a fiber bundle in which the fiber (B) is mixed so that the fiber (B) / fiber (A) = 1.0 to 6.5 by mass ratio.

The mixing of the fiber (A) and the fiber (B) is suitably performed at the time of spinning so that uniform mixing can be obtained at the above-mentioned ratio. For example, the saddle type nozzle of FIG. 1 and the Y type nozzle of FIG. Can be simultaneously melt-spun from a spinning mold arranged at an appropriate interval. Of course, in this case, the number of nozzles and the total hole area of the spinning die are determined according to the mixing ratio of the saddle-shaped cross-section fibers and the Y-shaped cross-section fibers.

Alternatively, for example, the fiber (A) and the fiber (B) may be mixed by hand mixing or the like immediately before being processed into a wig or the like. In the hand mix, it is sufficient that the fibers are finally mixed uniformly, but in general, the fibers are mixed by hackling. A hack ring is a fiber bundle that is passed through dozens of times while mixing the fibers (A) and fibers (B) through a needle mountain, using a plate with many needles, such as a sword mountain with a needle length of 5 cm and a needle interval of about 2 cm. Is uniformly mixed.

In Tables 1 and 2, “curling property” indicates that a fiber bundle having a length of 45 cm and 20 g is wound around a pipe having a diameter of 20 mm so as to have a width of 38 cm and heated in a hot air dryer at 85 ° C. for 1 hour. Then, after being left for 2 hours in a constant temperature condition (temperature 20 ± 2 ° C., humidity 65 ± 5% RH) while being wound, the fiber bundle is removed from the pipe, the fiber bundle is hung down by its own weight, and the fiber after 24 hours The length of the bundle was measured and evaluated according to the following evaluation criteria.
Excellent: The length is less than 38 cm.
Good: The length is 38 cm or more and less than 40 cm.
Defect: The length is 40 cm or more.

In Tables 1 and 2, “Curl retention” is defined as the following evaluation by measuring the movement distance of the suspended tip before and after the suspension at a temperature of 20 ± 2 ° C. and a humidity of 50 ± 5% RH% for 24 hours. Evaluated by criteria.
Excellent: The moving distance is less than 1.5 cm.
Good: The moving distance is 1.5 cm or more and less than 3.0 cm.
Defect: The moving distance is 3.0 cm or more.

In Tables 1 and 2, “Flexible” means the feel when a fiber bundle having a length of 35 cm and 45 g is bent according to the judgment of five persons in charge of our sensory evaluation test (over 3 years of practical experience). From the difference from natural hair, sensory evaluation was performed according to the following evaluation criteria.
Excellent: Soft, like human hair, with moderate bounce when bent.
Good: Soft but has little rebound when bent, or soft but has large rebound when bent.
Defect: The touch is too soft or the touch is too hard.

Example 1
(A) 100 parts by mass of vinyl chloride resin (manufactured by Taiyo PVC Co., Ltd., TH-1000: viscosity average polymerization degree 1000), 3 parts by mass of hydrotalcite-based composite stabilizer (manufactured by Nissan Chemical Industries, CP-410A), epoxidation Using a Henschel mixer, a mixture containing 0.5 parts by mass of soybean oil (Asahi Denka Kogyo Co., Ltd., O-130P) and 0.8 parts by mass of an ester lubricant (manufactured by Riken Vitamin Co., Ltd., EW-100) A step of stirring and raising the temperature to 100 ° C. to obtain a resin composition, (b) a spinning die having a saddle type (FIG. 1) nozzle cross section and a Y type (FIG. 2) nozzle cross section ( Using a 40 mm single screw extruder controlled at 175 to 185 ° C. using a nozzle cross-sectional area of 0.06 mm ² , vertical hole number 44 and Y type hole number 76), at a mold temperature of 180 ° C. and an extrusion rate of 10 kg / hour. Melt spinning, average fineness 1 A step of obtaining an undrawn yarn of 0 dtex, (c) a step of drawing the melt-spun fiber to 300% in an air atmosphere of 100 ° C., and (d) a fiber in an air atmosphere of 140 ° C. on the drawn fiber. Steps of heat-relaxing until the total length of the film shrunk to 75% before treatment were sequentially mixed and mixed at a mixing ratio shown in Table 1 to obtain a fiber bundle.

(Example 2 and Comparative Examples 1 and 2 )
By changing the nozzle shape in step (b) of Example 1, fiber bundles were obtained in the same manner as in Example 1 with the mass mixing ratio shown in Table 1.

( Comparative Example 3, Example 3, Comparative Examples 5-8)
The nozzles of the step (b) of Example 1 are spun one by one, and the fibers (A) and the fibers (B) are hackling mixed at the mass mixing ratios shown in Tables 1 and 2 in the final (e) step. Thus, a fiber bundle was obtained.

As can be seen from Tables 1 and 2, according to the present invention, it was found that a fiber bundle excellent in curling property, curl retaining property and flexibility was easily obtained.

The fiber bundle of the present invention is suitably used for a hair bundle for hair decoration such as a wig, a hair piece, a blade, a doll hair, an extension hair, and the like.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic cross-sectional view of a single fiber obtained by spinning a fiber (A) having a vertical cross-sectional shape and a spinning shape according to an embodiment of the present invention. 1 is a schematic cross-sectional view of a single fiber obtained by spinning and spinning a Y-shaped nozzle shape of a fiber (B) according to an embodiment of the present invention.

Claims (4)

A mixed synthetic fiber bundles out with fibers (B) of the fibers (A) and the vinyl chloride resin composition of the vinyl chloride resin composition,
The cross-sectional shapes of the fiber (A) and the fiber (B) are a saddle type, a Y type, a triple dumpling type, a deformed cross type, a C type, and a modified C type, respectively, and the fiber (A) and the fiber (B ) With a mass ratio of fiber (B) / fiber (A) = 1.0 to 6.5 The minimum of the section moment about the axis passing through the centroid of the fiber cross section of the fiber (A) Value (I _min ) of 0.4 × 10 ⁻⁶ mm ^{4 to} 1.8 × 10 ⁻⁶ mm ⁴ , and the minimum value of the cross-sectional secondary moment about the axis passing through the centroid of the fiber cross section of the fiber (B) _{(I min)} is ^{2.0 × 10 -6 mm 4 ~7.5 ×} 10 -6 mm 4, a is synthetic fiber bundles. The synthetic fiber bundle according to claim 1, wherein the average fineness is 30 to 100 dtex. A fiber bundle for hair decoration, comprising the synthetic fiber bundle according to claim 1 . A hair product comprising a fiber bundle for hair decoration according to claim 3 , selected from wigs, hair pieces, blades, extension hairs, and doll hairs.

Images