WO2005110136A1

WO2005110136A1 - Shrinkable fiber for artificial hair

Info

Publication number: WO2005110136A1
Application number: PCT/JP2005/009034
Authority: WO
Inventors: Seiichi Sakurai; Satoru Harada
Original assignee: Kaneka Corporation
Priority date: 2004-05-19
Filing date: 2005-05-18
Publication date: 2005-11-24
Also published as: JPWO2005110136A1; JP5105871B2

Abstract

Provided is a shrinkable fiber for an artificial hair, which is improved in the bulkiness of the hair as compared with a conventional one and also has acquired a soft touch. Although it has been proposed to improve the bulkiness by shrinkage, by utilizing a cross-sectional shape or the residual shrinkage of a fiber, the objective bulkiness has not been achieved and a problem of the lowering of characteristics as a commercial product has been arisen. The present inventors have found that the use of a fiber having shrinkability can impart excellent bulkiness to the resultant artificial hair and has completed the present invention, which is a shrinkable fiber for an artificial hair, which is a fiber for an artificial hair made of an acrylic polymer containing 30 wt % or more of acrylonitrile, characterized in that it exhibits a dry-heat shrinkage percentage of 5 % or more in a treatment at 100˚C for 30 minutes and has a single fiber fineness of 25 to 95 dtex.

Description

Shrinkable fiber for artificial hair

Technical field

The present invention relates to a novel shrinkable fiber for artificial hair used for wigs, hairpieces, blades, extension hair, doll hair, and the like, and a hair bundle for hair decoration using the same.

Background art

[0002] Synthetic fibers generally used for artificial hair include modacrylic fiber, vinyl chloride fiber, Shiridani biureiden fiber, polyester fiber, nylon fiber and the like. Conventionally, when processing these fibers into artificial hair products such as wigs, hair pieces, blades, etc., the cross-sectional shape of the fibers suitable for the product has been studied and improved. For example, in order to obtain bulky and voluminous products, Patent Documents 1 to 3 propose fibers that can improve bulkiness by a cross-sectional shape, but the bulking effect by the cross-sectional shape is limited, There is still room for improvement. In Patent Document 4, non-uniform crimps can be imparted by performing heat treatment using residual shrinkage of fibers. Patent Document 5 also states that it is possible to arbitrarily impart crimp by mixing and heating two or more types of fibers having a difference in residual shrinkage of 5 to 80%. However, there were problems that the crimp was too fine, the uneven crimp was obtained and the feel was hard, and the desired bulkiness could not be obtained, resulting in a decrease in commercial properties. In Patent Document 6, there is a description that the curl can be uniformly expressed and imparted using a polychlorinated vinyl fiber, and satisfactory bulkiness is not obtained at present. As a processing method for imparting crimp, a gear crimping method is generally used from the viewpoint of workability. However, at present, the bulkiness of the crimped fiber bundle is determined by the cross-sectional shape of the fiber.

Patent Document 1: Japanese Utility Model Publication No. 56-42980

Patent Document 2: JP-A-8-296112

Patent Document 3: JP-A-8-302519

Patent Document 4: JP-A-6-287801 Patent Document 5: JP-A-9302513

Patent Document 6: Japanese Patent Application Laid-Open No. 2003-293213

Disclosure of the invention

Problems to be solved by the invention

[0003] Therefore, an object of the present invention is to provide an artificial hair shrinkable fiber having improved bulkiness and operability (crimpability) as compared to the conventional art, and imparted with a soft touch. It is to do.

Means for solving the problem

[0004] As a result of intensive studies to solve the above problems, it has been found that by giving fibers of a specific fineness range shrinkage properties, excellent bulkiness can be imparted without impairing the physical properties of ordinary fibers. The present inventors have found that operability is improved, such as ease of crimping and increase in processing speed, and have reached the present invention. That is, the present invention relates to an artificial hair fiber comprising an acrylic polymer containing 30% by weight or more of acryl-tolyl, and having a dry heat shrinkage of 100% or more for 30 minutes and a single yarn fineness. The present invention relates to a contractile fiber for artificial hair, wherein the fiber has a dtex of 25 to 95 dtex.

[0005] Furthermore, the spun yarn is stretched 1.2 to 4.0 times at 90 to 150 ° C., and preferably, the apparent bulk after crimping is 6.5 cm or more. This is a shrinkable fiber for artificial hair. Further, in the above-mentioned artificial hair contractile fiber, the fiber is used for hair decoration, and the hair decoration can be suitably used for a wig, a hairpiece, a blade, an extension hair, or a doll hair. Further, in the artificial hair shrinkable fiber, a head decoration fiber bundle formed by forming a crimped fiber bundle, preferably the crimping process is a gear crimp method. I do. In the head decoration fiber bundle, the fiber bundle can be used as a wig, a hairpiece, a blade, an extension hair, or a doll hair.

The invention's effect

[0006] The artificial hair shrinkable fiber according to the present invention has a shrinkage ratio of a specific level or more, and is a preferable texture as an artificial hair fiber for blades, extension hair, and the like. It has excellent operability, such as crimp kajue. Furthermore, by using a crimped fiber bundle such as a gear crimp on these fibers, it is possible to obtain head decoration products such as blades and extension hair having excellent bulkiness.

Brief Description of Drawings

FIG. 1 is an explanatory view showing a method of measuring bulkiness before and after crimping, wherein (a) is a perspective view and (mouth) is a cross-sectional view at the time of measurement.

Explanation of symbols

[0008] 1 Measurement container

2 Lid for measuring container

3 Shrinkable fibers for artificial hair, fiber bundle after crimping

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, the present invention will be described in detail. As the acrylic copolymer in the present invention, a polymer containing 30% by weight or more of acrylo-tolyl is used. If the content of acrylonitrile is less than 30% by weight, the heat resistance of the fiber deteriorates. Further, the polymerization may be performed using a vinyl monomer copolymerizable with acrylonitrile in addition to acrylonitrile. Examples of the copolymerizable vinyl monomer include: vinyl chloride, vinyl chloride bilidene, vinyl bromide, vinylidene bromide, ester acrylate, methacrylic ester, acrylamide, or a modified or dialkyl-substituted product thereof. Body, acrylic acid, methacrylic acid, itaconic acid, styrene sulfonic acid, methallyl sulfonic acid, methacryloxybenzene sulfonic acid, methacryloxypropyl sulfonic acid, or metal salts thereof, and ammonium nitramine salts, Examples include glycidyl alkylate, glycidyl methacrylate, acrylic glycidyl ether, methallyl glycidyl ether, and the like. Among them, Shiojiri vinyl and Shiridani biylidene are preferred. The above polymer is dissolved in an organic solvent, for example, acetone, acetonitrile, dimethylformamide or the like to prepare a spinning solution. Note that, if necessary, a stabilizer or the like having an effect on light resistance or the like may be added. Also, various additives may be added in appropriate amounts for adjusting the gloss. Further, pigments, dyes, and the like may be used as appropriate to obtain colored fibers.

[0010] Usually, the above spinning stock solution may be spun from a nozzle by a wet or dry spinning method, stretched, and heat-treated. The obtained yarn is heated at 90 to 150 ° C, preferably at 115 to 140 ° C. 1. It is possible to obtain a shrinkable fiber having a dry heat shrinkage of 5% or more in a treatment at 100 ° C. for 30 minutes by stretching it by a factor of 2 to 4.0. When the stretching temperature is lower than 90 ° C! ヽ, heat conduction to the fiber is insufficient and it is difficult to stretch to a predetermined stretching ratio. On the other hand, when the temperature exceeds 150 ° C., although the film can be stretched, the shrinkage ratio is undesirably reduced. The shrinkage ratio of the heat-shrinkable fiber for artificial hair of the present invention is 5% or more, preferably 10% or more at a dry heat of 100 ° C for 30 minutes. Fibers for artificial hair having a dry heat shrinkage ratio of less than 5% have poor crimp-giving properties and cannot provide satisfactory bulkiness.

[0011] The cross-sectional shape of the shrinkable fiber for artificial hair of the present invention is not particularly limited, but in consideration of the bulkiness, curl characteristics, combability, and other cosmetic characteristics of human hair, the cross-sectional shape is A horseshoe, C, hollow, elliptical, circular, dumbbell and Y-shape are suitable, but a horseshoe, C-shaped, dumbbell and Y A letter shape is preferred, and a Y-shaped section is preferred because it is excellent in terms of bulkiness.

[0012] The dry heat shrinkage ratio in the present invention means a shrinkage ratio at a dry heat of 100 ° C. Specifically, a test length (Lw) under lOmgZ decitex load per decitex is measured. The shrinkage was determined by shrinking in a convection oven by dry heat treatment at 100 ° C. for 30 minutes, returning to room temperature, measuring the test length (LV) under a lOmgZ decitex load, and calculating the shrinkage ratio by the following equation. Dry heat shrinkage (%) = ((Lw-! W) / Lw) X 100

The processing temperature of the dry heat shrinkage is 1% or more, preferably 2% or more under dry heat of 80 ° C. 2% or more, preferably 4% or more at 90 ° C. Under dry heat of 110 ° C, the shrinkage ratio is 10% or more, preferably 15% or more, and the shrinkage ratio changes depending on the processing temperature.

The single fiber fineness of the shrinkable fiber for artificial hair of the present invention is desirably in the range of 25 to 95 dtex, but is preferably 30 to 80 dtex. If it is less than 25 dtex, the appearance as artificial hair is too thin and too soft. If it exceeds 95 dtex, it is too thick and the texture is too hard. In any case, it is unsuitable as a raw material for artificial hair.

[0013] When the shrinkable fiber for artificial hair according to the present invention is used as a fiber bundle for hair, it is preferable to crimp the fiber. The crimping method is performed by a gear crimping method in which the fibers are sandwiched between gear rolls of two heater-type gears and a continuous crimp is applied. The fibers heated by steam or the like are continuously transferred to a stuffing box or the like. To give crimp The crimping method referred to in the present invention, which is good if a crimped shape required for hair decoration applications, is generally provided by a gear crimping method. Is most preferred. These methods improve the workability of blades, extension hairs, and the like by imparting a crimp in a corrugated shape suitable for the target product. The shrinkable fibers and fiber bundles for artificial hair of the present invention are used for hair decoration such as wigs, hairpieces, blades, extension hairs, doll hairs, etc., and are crimped fibers such as gear crimps. The bundle is particularly suitable for the blade, the extension hair and the like among the above head decoration fiber bundles.

[0014] The apparent bulkiness in the present invention is measured under the following conditions. That is, the fiber bundle before crimping is cut exactly to lm, and the lOg is measured and taken as fiber bundle F. This fiber bundle F is placed in a grooved container 1 having a length (L) X width (W) = 30 cm x 6 cm and a groove open at both ends as shown in Fig. 1 (a). The thin plate 2 having the same dimensions as the flat groove was gently placed, a load of 0.25 gZcm2 was applied, and the height H in the grooved container 1 after 1 minute was measured. H is the height (cm) from the inner bottom side of the grooved container 1 shown in FIG.

[0015] Softness, bulkiness, operability, and overall evaluation were examined according to the methods described below. The results are shown in Table 1.

[0016] The soft feeling was judged by performing a sensory test (softness of the fiber bundle after crimping) by five persons.

The bulkiness was evaluated based on the apparent bulkiness and the volume feeling of the fiber bundle and the braided product after crimping. The operability was evaluated based on the crimpability by the gear crimping method using the crimping machine described in the Examples, that is, whether the crimping was close to the gear waveform or not. In the overall evaluation, those satisfying all of softness, bulkiness and operability were judged as acceptable (〇), and other cases were judged as failed.

Example

(Example 1)

Acrylonitrile 49 wt ^_0/0, chloride Bulle 50 weight ^_0/0, the copolymer榭脂of styrene sulfonate sodium 1 wt% was dissolved in acetone, further carbon black 0.6 wt%, the force thione liquid dyestuff (coercive (Tsuchiya-Danigaku) red; 0.25% by weight, yellow; 0.4% by weight were added to prepare a 27.5% by weight stock solution for spinning. This spinning solution is added to the dumbbell spinning nozzle. Using a nozzle draft 1.1 at 20% by weight in an aqueous acetone solution at 20 and spin-drying the resulting fiber in a washing bath at 60 ° C and drawing 1.5 times. After drying at ° C, the film was stretched by a factor of 2.5 at 120 ° C. The single yarn fineness of the fiber thus obtained was 50 dtex, and the dry heat shrinkage was 13.3%. The resulting fibers were bundled to a total fineness of 1.13 million dtex, and the apparent bulkiness before crimping was measured in the measurement container shown in FIG. 1 to find that the height H was 1.4 cm. This fiber bundle is crimped by using a gear turret processing machine with a gear pitch = 8 mm and a gear depth = 5 mm, and then fully trimmed with a comb to measure the apparent bulkiness as described above. The height H was 7.95 cm when measured with a vessel. In addition, a fiber bundle that has been crimped and aligned under the same measurement conditions as the above is used as a typical braided product of 5 g × 30 steps (regular size), and the bulkiness and softness of the blade are A sensory evaluation was conducted for operability such as feeling and crimpability, and a comprehensive evaluation was performed. Table 1 shows the results.

(Example 2)

Using the same spinning dope as in Example 1, using a Y-shaped spinning nozzle, the solution was spun at 25% by weight into an aqueous acetone solution at 18 at 25% by nozzle draft 1.2. This fiber was subjected to dry to dry heat drawing in the same manner as in Example 1. The single fiber fineness of the fiber thus obtained was 51 dtex, and the dry heat shrinkage was 12.5%. The resulting fibers were bundled to a total fineness of 1.13 million dtex, and the apparent bulkiness before crimping was measured in the measurement container shown in FIG. 1 to find that the height was H = 2.5 cm. Further, this fiber bundle was crimped and straightened using a crimping machine in the same manner as in Example 1, and the apparent bulk was measured. The height was H = 9.80 cm. This crimped bundle was subjected to crimping in the same manner as in Example 1, and the aligned fiber bundle was converted into a typical braided product of 5 g × 30 steps (regular size) as a typical braid. A sensory evaluation was performed on the bulkiness, operability such as softness and crimpability, and a comprehensive evaluation was performed. Table 1 shows these results.

(Example 3)

Using the same spinning dope as in Example 1, using a horseshoe-type spinning nozzle, the solution was spun into an aqueous acetone solution at 20% by weight at 20% by nozzle draft 1.1. This fiber was subjected to dry to dry heat drawing in the same manner as in Example 1. The fiber fineness of the fiber thus obtained is 55.6 dtex. And the dry heat shrinkage was 15.1%. The obtained fibers were bundled to a total fineness of 1.13 million dtex, and the apparent bulkiness before crimping was measured in the measurement container shown in FIG. 1 to find that the height was H = 1.6 cm. Further, this fiber bundle was crimped and aligned using a crimping machine in the same manner as in the example, and the apparent bulkiness was measured. The height was H = 8.22 cm. The crimped bundle was subjected to crimping in the same manner as in Example 1 and straightened into a fiber bundle. The resulting braid was a typical braid of 5 g x 30 steps (regular size), A sensory evaluation was conducted on the operability such as the bulkiness, softness, and crimpability as a blade, and a comprehensive evaluation was performed. Table 1 shows the results.

(Example 4)

Using the same spinning dope as in Example 1, using a dumbbell-type spinning nozzle, the solution was spun into an aqueous acetone solution at 20% by weight in a nozzle draft 1.1 at 20%, and the resulting fiber was washed in a water washing bath at 60 ° C After removing the solvent and stretching by 1.5 times, the film was dried at 130 ° C and then stretched by dry heat at 120 ° C by 1.8 times. The single fiber fineness of the fiber thus obtained was 50 dtex, and the dry heat shrinkage was 5.3%. The obtained fibers were bundled to a total fineness of 1.13 million dtex, and the apparent bulkiness before crimping was measured with a measuring container shown in FIG. 1 to find that the height was H = 1.5 cm. Further, this fiber bundle was crimped and straightened using a crimping machine in the same manner as in the example, and the apparent bulkiness was measured. The height was H = 6.70 cm. The crimped bundle was subjected to crimping in the same manner as in Example 1, and the aligned fiber bundle was used as a typical braided braid of 5 g x 30 steps (regular size), A sensory evaluation was performed on the operability such as the bulkiness, softness, and crimp impartability of the blade, and a comprehensive evaluation was performed. The results are shown in Table 1.

(Comparative Example 1)

Using the same spinning solution as in Example 1, using a dumbbell-type spinning nozzle, the solution was spun into an aqueous acetone solution at 20% by weight in a nozzle draft 1.4 at 18 and the obtained fiber was washed in a water washing bath at 60 ° C. After removing the solvent and stretching by 1.5 times, followed by drying at 130 ° C, stretching by dry heat of 2.5 times at 120 ° C and relaxation heat treatment at 145 ° C. The single yarn fineness of the fiber thus obtained was 46 dtex, and the dry heat shrinkage was 1.5%. The obtained fibers were bundled to a total fineness of 1130,000 dtex, and the apparent bulkiness before crimping was measured in the measurement container shown in FIG. 1, Height H = l. 3 cm. Further, this fiber bundle was crimped and trimmed using a crimping machine in the same manner as in the example, and the apparent bulkiness was measured. The height was H = 5.50 cm. The crimped bundle was subjected to crimping in the same manner as in Example 1 and straightened into a fiber bundle. The resulting braid was a typical braid of 5 g × 30 steps (regular size) braided product. An organoleptic evaluation was performed on the bulkiness, softness, and crimpability of the operability, and a comprehensive evaluation was performed. Table 1 shows the results.

(Comparative Example 2)

Using the same spinning solution as in Example 1, using a dumbbell-type spinning nozzle, the solution was spun into an aqueous acetone solution at 20% by weight in a nozzle draft 1.4 at 18 and the obtained fiber was washed in a water washing bath at 60 ° C. After removing the solvent and stretching by 1.5 times, the film was dried at 130 ° C, stretched by dry heat at 120 ° C by 2.5 times, and further subjected to relaxation heat treatment at 150 ° C. The single yarn fineness of the fiber thus obtained was 51 dtex, and the dry heat shrinkage was 1.1%. The obtained fibers were bundled to a total fineness of 110,000 dtex, and the apparent bulkiness before crimping was measured in the measurement container shown in FIG. 1 to find that the height was H = 1.4 cm. Further, this fiber bundle was crimped and trimmed using a crimping machine in the same manner as in the example, and the apparent bulkiness was measured. The height was H = 6.15 cm. The crimped bundle was subjected to crimping in the same manner as in Example 1 and straightened into a fiber bundle. The resulting braid was a typical braid of 5 g × 30 steps (regular size) braided product. An organoleptic evaluation was performed on the bulkiness, softness, and crimpability of the operability, and a comprehensive evaluation was performed. Table 1 shows the results.

(Comparative Example 3)

Using the same spinning dope as in Example 1, using a horseshoe-type spinning nozzle, a nozzle draft 1.4 spins out 20% by weight into an aqueous acetone solution at 18 at 20% by weight. After removing the solvent and stretching by 1.5 times, the film was dried at 130 ° C, stretched by 2.8 times at 120 ° C, and further subjected to relaxation heat treatment at 130 ° C. The single yarn fineness of the fiber thus obtained was 43 dtex, and the dry heat shrinkage was 4.2%. The obtained fibers were bundled to a total fineness of 110,000 dtex, and the apparent bulkiness before crimping was measured in the measurement container shown in FIG. 1 to find that the height was H = 1.3 cm. Also, after applying a crimp to the fiber bundle and crimping it using a crimping machine in the same manner as in the example, the apparent bulkiness was measured, and the height H was found to be 5.95 cm. I got it. The crimped bundle was subjected to crimping in the same manner as in Example 1 and straightened into a fiber bundle. The resulting braid was a typical braid of 5 g × 30 steps (regular size) braided product. An organoleptic evaluation was performed on the bulkiness, softness, and crimpability of the operability, and a comprehensive evaluation was performed. Table 1 shows the results.

(Comparative Example 4)

Using the same spinning solution as in Example 1, using a dumbbell-type spinning nozzle, the solution was spun into an aqueous acetone solution at 20% by weight in a nozzle draft 1.4 at 18 and the obtained fiber was washed in a water washing bath at 60 ° C. After removing the solvent and stretching by 1.5 times, the film was dried at 130 ° C, stretched by dry heat at 140 ° C by 2.5 times, and further subjected to relaxation heat treatment at 155 ° C. The single yarn fineness of the fiber thus obtained was 50 dtex, and the dry heat shrinkage was 3.5%. The obtained fibers were bundled to a total fineness of 110,000 dtex, and the apparent bulkiness before crimping was measured in the measurement container shown in FIG. 1 to find that the height was H = 1.5 cm. Further, this fiber bundle was crimped and trimmed using a crimping machine in the same manner as in the example, and the apparent bulkiness was measured. The height was H = 5.8 cm. The crimped bundle was subjected to crimping in the same manner as in Example 1 and straightened into a fiber bundle. The resulting braid was a typical braid of 5 g × 30 steps (regular size) braided product. An organoleptic evaluation was performed on the bulkiness, softness, and crimpability of the operability, and a comprehensive evaluation was performed. Table 1 shows the results.

(Comparative Example 5)

Using the same spinning dope as in Example 1, using a Y-shaped spinning nozzle, the mixture was spun into an aqueous acetone solution at 18 at 20% by weight with a nozzle draft of 1.2, and the resulting fiber was washed in a washing bath at 60 ° C. The solvent was removed and stretched 1.5 times, followed by drying at 125 ° C, followed by 2.5 times dry heat stretching at 135 ° C, and relaxation heat treatment at 145 ° C. The single yarn fineness of the fiber thus obtained was 32 dtex, and the dry heat shrinkage was 1.2%. The resulting fibers were bundled to a total fineness of 110,000 dtex, and the apparent bulkiness before crimping was measured in the measurement container shown in FIG. 1 to find that the height was H = 2.1 cm. Further, this fiber bundle was crimped and trimmed using a crimping machine in the same manner as in the example, and the apparent bulkiness was measured. The height was H = 7.55 cm. The crimped bundle was subjected to crimping in the same manner as in Example 1, and the aligned fiber bundle was used as a typical braided braid of 5 g × 30 steps (regular size), which was a blade. The sensory evaluation was carried out for the bulkiness, softness, crimpability and other operability, and a comprehensive evaluation was performed. Table 1 shows the results.

(Comparative Example 6)

Using the same spinning dope as in Example 1, using a Y-shaped spinning nozzle, the fiber was spun into a 25% by weight aqueous acetone solution at 18 with a nozzle draft of 1.2, and the resulting fiber was washed in a washing bath at 60 ° C. The solvent was removed and the film was stretched 1.5 times, then dried at 135 ° C, stretched at 130 ° C by 2.5 times, and further subjected to relaxation heat treatment at 148 ° C. The single yarn fineness of the fiber thus obtained was 51 dtex, and the dry heat shrinkage was 1.0%. The resulting fibers were bundled to a total fineness of 110,000 dtex, and the apparent bulkiness before crimping was measured in the measurement container shown in FIG. 1 to find that the height was H = 2.5 cm. Further, the fiber bundle was crimped and aligned using a crimping machine in the same manner as in Example 1, and the apparent bulkiness was measured. The height was H = 7.0 cm. This crimped bundle was crimped and straightened in the same manner as in Example 1 to obtain a typical braided braid of 5 g x 30 steps (regular size), which was used as a braid. An organoleptic evaluation was conducted on the operability such as bulkiness, softness and crimpability, and a comprehensive evaluation was performed. These results are shown in Table 1.

[table 1]

Insulation fineness Dry heat Apparent bulkiness Bulkiness Operability Overall rating Shrinkage rate, cm) Sensuality (%) Evaluation before crimping Evaluation after crimping

Implement Arin © 〇〇〇 Example §u

Implementation Y-shaped 5 1 1 2.2.5 0 〇 ◎ 〇〇 Example 2

Implementation Horseshoe 55.1.6 ◎ O 〇 Example 3 6

Implementation Arin 0 〇〇〇〇 Example 4

Compare Arin 〇

Example ¾

Comparison Arin 51 1.4 〇

Example 2 type

Comparison Horseshoe 43 1.3 〇

Example 3

Comparison Arin 50 1.5 0 Δ

An example

Example 5 m [

Comparison Y character 51.2.5 5 〇

Example 6 1

Note) Evaluation method and sensory evaluation criteria

Feeling

Method = By sensory test.

◎: very soft 〇 soft, good, Δ: slightly hard,: hard

(Bulky)

(Comprehensive evaluation)

〇: passed,: failed.

Claims

The scope of the claims

[1] An acrylic polymer fiber containing 30% by weight or more of acryl-tolyl, which is a fiber for artificial hair that has a dry heat shrinkage of 5% or more when treated at 100 ° C for 30 minutes, and has a single-fiber fineness. But

Shrinkable fiber for artificial hair, which is 25 to 95 decitex.

[2] The shrinkable fiber for artificial hair according to claim 1, wherein the spun yarn is stretched 1.2 to 4.0 times at 90 to 150 ° C.

3. The shrinkable fiber for artificial hair according to claim 1, wherein the apparent bulk after crimping is 6.5 cm or more.

[4] The shrinkable fiber for artificial hair according to any one of claims 1 to 3, wherein the fiber is for hair decoration.

5. The contractible fiber for artificial hair according to claim 4, wherein the hair decoration is a wig, a hairpiece, a blade, an extension hair, or a doll hair.

[6] A head decoration fiber bundle obtained by forming a crimped fiber bundle on the artificial hair property fiber according to any one of claims 1 to 3.

7. The head decoration fiber bundle according to claim 6, wherein a crimping process is performed by a gear crimp method.

8. The head decoration fiber bundle according to claim 6, wherein the fiber bundle is a wig, a hairpiece, a blade, an extension hair, or a doll hair.