JP2008002040A - Fiber for doll hair - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide fiber for doll hair and the like, having natural feeling, deep hue and gloss and excellent in curl processing and hair transplantation workability. <P>SOLUTION: The fiber for doll hair comprises a vinylidene chloride-based resin and has 4.5-15 average deviation of fineness. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a vinylidene chloride-based fiber for doll hair, which can obtain a natural texture similar to human hair when planted on the head of a doll to make hair.

  The doll hair to be planted on the head of the doll is required to have an appearance close to human hair, a touch feeling, and a texture. As such doll hair fibers, those using various synthetic resins such as synthetic linear polyamide, acrylic resin, and vinylidene chloride resin as materials are known (for example, see Patent Document 1).

  In recent years, toy companies have been competing and developing dolls with various hair designs, and the demands for curling and flocking of doll hair are increasing. In high-end dolls in particular, there is a strong demand for improvement of plastic shine caused by fibers made of synthetic resin, and it is possible to obtain natural and deep luster and natural texture closer to human hair. Is desired. For this reason, for example, various inventions have been disclosed in which a natural texture closer to human hair is realized by making the cross section of the fiber an irregular shape (see, for example, FIGS. 3 and 4 of Patent Document 2).

However, the surface of the fiber made of synthetic resin is very different from human hair with a unique surface structure called cuticle, even if the fiber cross section is irregularly shaped. It is very difficult to realize the texture and texture, and it is the fact that satisfactory doll hair has not yet been obtained.
JP 61-1113814 A JP-A-8-296115

  An object of the present invention is to provide hair fibers for dolls that have a natural texture, deep color, and gloss, and have good curling and flocking properties.

  1st of this invention is a fiber for doll hair which consists of a vinylidene chloride type-resin and the average deviation rate of a fineness exists in the range of 4.5-15. A second aspect of the present invention is the above-described method for producing a fiber for doll hair, characterized in that melt spinning is performed while causing variation over time in the amount of extrusion, followed by cooling.

  The fiber for doll hair of the present invention has good processability such as curl processability and flocking processability, and is excellent in non-hair removal properties when brushing. Furthermore, it has a natural texture, deep color and luster, and has a gloss, texture and feel that are very close to those of human hair.

  The present invention will be specifically described with a focus on preferred embodiments. The doll hair fiber of the present invention is obtained by spinning a resin composition containing a vinylidene chloride resin. By using a vinylidene chloride-based resin, it becomes easy to obtain a natural texture, deep color, gloss and feel that are very close to human hair.

  The vinylidene chloride-based resin may be obtained by polymerizing a vinylidene chloride monomer alone, but in order to further improve the physical properties of the fiber, at least one kind of vinylidene chloride monomer that can be copolymerized with the vinylidene chloride monomer is mainly used. It is preferably obtained by polymerizing a monomer mixture containing an ethylene derivative monomer. Here, “mainly” means that the vinylidene chloride monomer accounts for 50% by weight or more of the entire monomer mixture.

  Ethylene derivative monomers that may be included in the monomer mixture include nitriles of ethylenically unsaturated carboxylic acids such as acrylonitrile and methacrylonitrile, alkyl esters of acrylic acid and methacrylic acid such as methyl acrylate and methyl methacrylate, hydroxypropyl acrylate, Of hydroxyalkyl esters such as hydroxyethyl acrylate and hydroxybutyl acrylate, vinyl esters of saturated carboxylic acids such as vinyl acetate, amides of ethylenically unsaturated carboxylic acids such as acrylamide, ethylenically unsaturated carboxylic acids such as acrylic acid, allyl alcohol Examples thereof include ethylenically unsaturated alcohols and vinyl halides such as vinyl chloride. Among these, methyl acrylate or vinyl chloride is preferable in view of good thermal stability, and vinyl chloride is more preferable.

  Although the preferred weight ratio of vinylidene chloride monomer to ethylene derivative monomer in the monomer composition varies depending on the ethylene derivative monomer used, for example, when the ethylene derivative monomer is vinyl chloride, the preferred weight of vinylidene chloride monomer / vinyl chloride monomer The ratio is 65/35 or more and 98/2 or less. The transparency of the vinylidene chloride resin obtained by controlling the vinyl chloride monomer to 35% by weight or less is maintained, and the melt viscosity of the vinylidene chloride resin is maintained to be low by controlling the vinyl chloride monomer to 2% by weight or less. Extrusion becomes easier. More preferably, the weight ratio of vinylidene chloride monomer / vinyl chloride monomer is 80/20 or more and 95/5 or less. For example, when the ethylene derivative monomer is methyl acrylate, the weight ratio of vinylidene chloride monomer / methyl acrylate monomer is preferably in the range of 80/20 to 99/1. In order to obtain a vinylidene chloride-based resin, first, the above monomers may be charged into a reaction vessel equipped with a stirring blade and polymerized while stirring under certain polymerization conditions.

  The weight average molecular weight of the vinylidene chloride resin is preferably as small as 50,000 to 80,000. By reducing the weight average molecular weight, it is possible to improve productivity while maintaining the strength necessary for doll hair, although the strength of the resulting fiber is lower than conventional. By setting the weight average molecular weight to 50,000 or more, the strength required for the doll's hair is secured, and the flocking processability at the time of flocking to the doll's head and the non-hair removal property at the time of brushing become good. Further, by setting the weight average molecular weight to 80,000 or less, it is difficult for thermal decomposition or clogging of the spinneret to occur within the extruder during spinning, and the weight average molecular weight is 55,000 to 75,000. Preferably, it is 60,000 or more and 70,000 or less.

  Spinning doll hair fibers using vinylidene chloride resin was obtained by mixing the above vinylidene chloride resin and other components for improving fiber properties, etc., if necessary, and kneading well. A resin composition is used. The resin composition preferably contains 90% by weight or more of vinylidene chloride-based resin, and can provide strength and texture required for doll hair, and fiber for doll hair that is less likely to be sticky on the fiber surface and is easy to touch. It becomes easy to obtain. In addition, when other components are contained to make the vinylidene chloride resin 99.98% by weight or less, it becomes easy to obtain doll hair fibers in which troubles due to static electricity and combing are improved. The content of vinylidene chloride resin in the resin composition is more preferably 91% by weight to 97% by weight, and still more preferably 92% by weight to 95% by weight.

  The fiber for doll hair uses the above resin composition, is supplied to an extruder for vinylidene chloride resin while satisfying the conditions for causing variations described below, melt-extruded, spun from a spinning nozzle, and then in a cold water tank. It can be manufactured by cooling and drawing at a drawing temperature or draw ratio according to the purpose and then winding it on a bobbin or the like.

  The doll hair fibers have an average deviation rate (U%) of fineness (denier) in the range of 4.5-15. That is, it is necessary that the fiber thickness (= weight per unit length) varies at a constant rate. The variation in fiber thickness referred to here means that the thickness varies in the length direction within one fiber. This will be specifically described. FIG. 1 is a schematic diagram of an uneven curve showing fluctuations in fineness (denier) when the diameter of the fiber for doll hair of the present invention is measured while moving along the length direction of the fiber. The horizontal axis represents the fiber length direction, and the vertical axis represents the fineness deviation. As can be seen from FIG. 1, the thickness of the doll hair fiber fluctuates along the length direction and repeats irregular thickening and thinning around the average fineness. The degree of this variation is represented by the average deviation rate: U% (unit:%) in the following formula (1). In equation (1), n represents the number of measurement points, X with an overline represents the average value of fineness, and X represents the fineness at each measurement point.

  In FIG. 1, in the interval of the length L between the straight line A that means the measurement start point and the straight line B that means the measurement end point, the area sandwiched between the uneven curve and the X line with the overline, that is, FIG. In FIG. 1, the area surrounded by a straight line with a deviation of −100% and the straight line with an overline X, that is, a right-upward oblique line is attached in FIG. If the area is F, the average deviation rate U% within the test length L is a percentage of the area of f with respect to F. This is shown in the following formula (2).

  The doll hair fibers require that this U% is in the range of 4.5-15. In general, it is preferable that the fineness of the synthetic resin fiber is stable, and it is preferable that the average deviation rate is also small. However, surprisingly, it is possible to impart a natural texture and luster close to human hair to fibers using vinylidene chloride resin by varying the thickness within the fibers as described above. It turned out to be possible. The reason for this is unknown, but it is speculated that light scattering similar to light scattering on the surface of human hair covered with a cuticle may occur on the fiber surface due to the variation in thickness.

  When U% is 4.5 or more, a natural texture and luster close to human hair are imparted, and when U% is 15 or less, the tensile strength and elongation of the fiber are reduced. The thread breakage is not likely to occur during the flocking process. In addition, a smooth hand feeling in the case of doll hair can be obtained. U% is preferably 5 to 14, more preferably 6 to 13, and most preferably 7 to 12.

  Here, as a method for measuring the average deviation rate U%, a method is used in which a yarn is run between a pair of opposed electrodes and a minute change in capacitance proportional to the volume occupied by the yarn is detected. As a continuous measuring instrument by this method, a testing machine supplied by Measuring Instruments Industry Co., Ltd. or Zellweger Uster of Switzerland is widely known. In these devices, the degree of variation can be continuously measured and recorded as it is on a chart, but in general, U% obtained by dividing the average deviation by the average value is used as the magnitude of the variation in fineness. Many.

  Thus, in order to give variation in the fineness, it is only necessary to cause a change with time in the extrusion amount in melt spinning. For this purpose, the rotational speed of the screw of the extruder is directly controlled electrically so that the rotational speed fluctuates over time. Often difficult to control. Therefore, it is preferable to use the following method.

  (1) Devise the materials used. Specifically, by using mixtures with different powder particle sizes and powder shapes as the raw material polymer, the biting spots on the screw in the single screw extruder caused by the nonuniformity of the bulk density and solid friction The variation in the amount of extrusion is increased due to fluctuations in the solid transport part and melting spots in the compression part. (2) Devise the design of the screw of the extruder. For example, in the case of a single screw extruder, the measurement accuracy is lowered by shortening the length of a metering unit for extruding a certain amount of resin with a shallow uniform groove. Alternatively, the compression ratio and the screw groove depth at the time of extrusion are changed so as to slightly deviate from the range that provides stable extrusion conditions. (3) Devise the temperature conditions of the extruder. For example, the temperature setting (heating / cooling) of the extruder barrel is changed so as to slightly deviate from the range where stable extrusion is performed, and the resin temperature is changed to increase the amount of extrusion. A plurality of these may be selected and used in combination.

  Other components that may be added to the resin composition for spinning doll hair fibers include, for example, plasticizers, heat stabilizers, resins other than vinylidene chloride resins, surfactants, lubricants, and antistatic agents. Agents, antioxidants, light stabilizers, ultraviolet absorbers, pigments and the like. Although these other components have a certain effect in improving specific physical properties, they may be accompanied by an undesirable action such as increasing the stickiness of the fiber surface and reducing the feel of touch, so in the resin composition The total content is preferably 0.02 wt% or more and 10 wt% or less, more preferably 3 wt% or more and 9 wt% or less, and further preferably 5 wt% or more and 8 wt% or less.

  Examples of the plasticizer include diisobutyl adipate, dibutyl adipate, acetyl tributyl citrate, dibutyl sebacate, dioctyl adipate, dioctyl phthalate, and the like. From the viewpoint of improving the feel of the resulting fiber, diisobutyl adipate, Dibutyl adipate and acetyl tributyl citrate are preferable, and diisobutyl adipate or dibutyl adipate is more preferable. By using a plasticizer, melt extrusion processability can be improved and fiber productivity can be further improved, but on the other hand, the fiber surface is more likely to be sticky and the feel of doll hair is reduced. It becomes easy to do. The amount of the plasticizer is preferably 5% by weight or less in the resin composition, and more preferably 2% by weight or more and 5% by weight or less.

  Thermal stabilizers include epoxidized linseed oil, epoxidized soybean oil, bisphenol A diglycidyl ether, pentaerythrityl-tetrakis [3- (3,5-di-t-butyl-4-hydroxyphenyl) propionate], epoxy Examples include butyl stearate, octyl epoxidized stearate, magnesium oxide, magnesium hydroxide, and paraffin. Epoxidized stabilizers are preferred, and epoxidized linseed oil is most preferred. Although the thermal decomposition of the vinylidene chloride-based resin can be reduced by using the heat stabilizer, on the other hand, as with the plasticizer, the fiber surface is likely to be sticky and the touch feeling is likely to be lowered. The heat stabilizer is preferably 5% by weight or less in the resin composition, and more preferably 1% by weight or more and 4% by weight or less.

  Examples of the lubricant include montanic acid ester wax, stearic acid, liquid paraffin, fatty acid amide and the like, preferably fatty acid amide. As fatty acid amides, N, N′-ethylenebis (stearoamide), oleic acid amide, stearic acid amide, N, N′-methylenebis (stearoamide), methylol stearamide, erucic acid amide, behenic acid amide, N-oleyl palmi Toamide, N-stearyl erucamide, hardened beef tallow amide and the like can be mentioned. Preferred is a fatty acid amide having 18 or more carbon atoms, and more preferred is a cured beef tallow amide.

  The lubricant is preferably added so as to be 0.01 to 0.3% by weight in the resin composition. By adding 0.01% by weight or more, the slipperiness of the fiber surface is increased, and a smooth feel can be easily obtained. Moreover, by setting it as 0.3 weight% or less, a fiber with little precipitation to the fiber surface of a lubricant and high transparency is obtained. In addition, stickiness on the fiber surface is less likely to occur, and doll hair with a good touch is easily obtained. Preferably they are 0.03 weight% or more and 0.20 weight% or less, More preferably, they are 0.05 weight% or more and 0.1 weight% or less.

  Examples of the antistatic agent include sorbitan fatty acid ester, alkylbenzene sulfonate, quaternary ammonium salt, glycerin fatty acid ester and the like. Glycerin fatty acid ester is preferable. As the glycerin fatty acid ester, any of fatty acid monoglyceride, fatty acid diglyceride, fatty acid triglyceride may be used. Examples thereof include glyceride, stearic acid glyceride, oleic acid glyceride, polyglycerin fatty acid ester, polyglycerin condensed lysyl acid ester and the like. Of these, fatty acid monoglycerides are preferable, and stearic acid glyceride and oleic acid glyceride are more preferable.

  The antistatic agent is preferably added in an amount of 0.01 to 0.3% by weight in the resin composition. By adding 0.01% by weight or more, an antistatic effect can be easily obtained. Moreover, by setting it as 0.3 weight% or less, there exists little precipitation of an antistatic agent on the fiber surface, transparency is high, stickiness on the fiber surface does not produce easily, and it becomes easy to obtain doll hair with a good touch. Preferably they are 0.03 weight% or more and 0.20 weight% or less, More preferably, they are 0.05 weight% or more and 0.1 weight% or less.

  Examples of the ultraviolet absorber include 2- (2′-hydroxy-5′-tert-butylphenyl) benzotriazole, 2- (2′-hydroxy-5′methylphenyl) benzotriazole, and 2- (2′-hydroxy-3). '-5'-di-tert-butylphenyl) benzotriazole, 2- (2'-hydroxy-3'-tert-butyl-5'-methylphenyl) -5-chlorobenzotriazole, 2- (2'-hydroxy -3 ′, 5′di-tert-butylphenyl) -5′-chlorobenzotriazole, 2- (2′-hydroxy-3 ′, 5′di-tert-amylphenyl) benzotriazole, 2- {2′- Hydroxy-3 ′-(3 ″, 4 ″, 5 ″, 6 ″ -tetrahydrophthalimidomethyl) -5′-methylphenyl} benzotriazole, 2 2-methylenebis {4- (1,1,3,3-tetramethylbutyl) -6- (2H-benzotriazol-2-yl) phenol}, 2- (2′-hydroxy-5′-methacryloxyphenyl) ) -2H-benzotriazole and other benzotriazole ultraviolet absorbers, 2,4-hydroxybenzophenone, 2-hydroxy-4-methoxybenzophenone, 2-hydroxy-4-octoxybenzophenone, 2-hydroxy-4-dodecyloxybenzophenone 2-dihydroxy-4-methoxybenzophenone, 2-dihydroxy-4,4′-methoxybenzophenone, 2-hydroxy-4-methoxy-5-sulfobenzophenone, bis (2-methoxy-4-hydroxy-5-benzoylphenyl) Benzophenone UV absorbers such as methane It can be exemplified.

  Examples of the pigment include organic pigments, inorganic pigments, fluorescent pigments, and temperature-sensitive color changing pigments. Furthermore, in order to increase the dispersibility of these pigments and prevent secondary aggregation of the pigments, processed pigments based on styrene resins or acrylic resins, or paste pigments dispersed in liquid plasticizers may be used. .

  The cross-sectional structure of the doll hair fiber may be any of a uniform structure, a hollow structure, a multilayer structure, etc., and the cross-sectional shape may be a normal circular shape, a triangle, a polygon, a Y-shape, It may be an irregular shape such as a star shape or a flat shape. In particular, it is preferable to have a circular hollow structure because a light and smooth feel when used as doll hair is obtained. Further, the fiber may be a multifilament in which single yarns having various structures and shapes are combined. When using as a multifilament, you may mix with fibers other than the fiber of this invention.

  When the doll hair fibers are hollow fibers, the fiber hollow ratio is preferably 3 to 30%. Here, the hollow ratio means that the cross-sectional area of the hollow portion of the fiber occupies the cross-sectional area defined by the outer diameter of the fiber when the cross-sectional shape of the surface perpendicular to the length direction of the fiber is observed with a microscope. Say percentage. When the hollowness is 3% or more, it is easy to obtain the light touch and volume feeling required for doll hair, and when it is 30% or less, the strength required for doll hair is ensured and yarn cracking is less likely to occur. Furthermore, the flocking processability at the time of flocking to the doll head and the non-hair removal property at the time of brushing are also good.

  It is preferable that the average outer diameter (X with the above-mentioned upper line) of the fiber for doll hairs is 0.01-0.2 mm. Here, the average outer diameter is obtained by calculating the diameter of the circumscribed circle of the fiber cross section with respect to a plurality of cross sections when the cross sectional shape of the surface perpendicular to the length direction of the fiber is observed with a microscope, and obtaining the number average thereof. Say the value. When the average outer diameter is 0.01 mm or more, the strength required for doll hair is secured, and when it is 0.2 mm or less, a soft hand feeling similar to natural hair is obtained.

  The obtained doll hair fibers are subjected to a molding process such as a curl process if necessary. FIG. 2 is a schematic diagram illustrating a schematic configuration of an example of a curling apparatus that performs a curling process on a fiber. The fiber is taken out from one or more bobbins 7 around which the spun fiber is wound, and is supplied to the machine head 5 in a bundled state via the pipe yarn path 6. The machine head 5 rotates around a mandrel 3 extending in the left-right direction toward the drawing, and discharges fibers onto the mandrel 3 from the side opposite to the bobbin 7. The fibers are sequentially moved to the left side of the drawing while being wound around the mandrel 3, and are heated by the heater 4 provided around the mandrel 3, and the fiber shape is fixed while being wound. And the fiber which moved to the left side toward the drawing and passed through the heater 4 is detached from the mandrel 3 at the end of the mandrel 3 and stored in the resin bag 1 in the curled shape. This completes the curl process.

  If necessary, the fiber that has been subjected to curling or the like is implanted into the doll head to become doll hair. FIG. 3 is a diagram showing a schematic configuration example in the case where fibers are planted using a planted sewing machine on the doll head. The fiber 14 is drawn out from the bobbin 13 around which the fiber is wound, and is guided onto the doll head 9 via the rotary pipe thread path 11 provided in the suspension portion of the sewing machine body 8. The sewing needle 10 penetrates the doll head 9 upward from the inside, hooks the fibers 14 and draws the hair into the doll head 9. By relatively moving the position of the doll head 9 and the exit of the rotary pipe thread path 11, flocking is performed on the entire necessary portion of the doll head 9.

EXAMPLES Hereinafter, although this invention is demonstrated further in detail using an Example and a comparative example, this invention is not limited to the specific aspect of a following example. In addition, the evaluation method of various physical properties is as follows.
《Average particle diameter of vinylidene chloride resin powder, outer diameter of amorphous particles》

The vinylidene chloride resin obtained by polymerization is dried, a micrograph of the obtained powder is taken, the particle size of 50 randomly selected powder particles is measured, and the simple average is taken as the average particle size. did. In the case of amorphous particles, a micrograph was taken in the same manner as powder particles, the diameter of the circle circumscribed by the irregular particles was measured, and the simple average of 50 particles was also determined as the outer diameter.
《Average outer diameter, hollow ratio》

Ten hollow single yarns were hardened with an epoxy resin, and a cross section perpendicular to the length direction was cut out and measured by microscopic observation. The measurement is to measure the major axis and minor axis of the outer circumference of each cross section and simply average to obtain the single thread outer diameter, further measure the major axis and minor axis of the inner circumference to obtain the single thread inner diameter, The area ratio of the hollow portion of each single yarn was calculated from the single yarn inner diameter. Finally, 10 average values of these values were obtained, respectively, and used as the average outer diameter and the hollowness.
<< Measurement of average deviation rate U% >>

Using the electric capacitance type yarn unevenness tester [manufactured by Keiki Kogyo Co., Ltd., trade name: Keisoki Evenness Tester Model KET-80C], the multifilaments obtained in Examples and Comparative Examples are 2 at a running speed of 25 m / min. The measurement was performed continuously for minutes, and the obtained value of U% (N = 5 points) was averaged.
《Doll hair texture evaluation》
(1) Production of doll head a (straight hair)

To a spherical doll head having a diameter of about 6 cm made of a vinyl chloride sheet (thickness of about 1 mm), a doll flocking sewing machine similar to that shown in FIG. 3 (DOLLY CO. LTD, trade name: TUNF-28B, Using a planting speed of 800 RPM and a fiber cut length of 25 cm), the fibers obtained in the examples and comparative examples were about 50 cm ² from the top of the doll head to the back of the head (vertical part) and the temporal region (vertical part). The area was flocked. Further, the above-mentioned doll head is fixed on the top of a vertically fixed 30 cm long fixing rod, and the hair is brushed directly below with a commercially available dog-and-cat pet slicker brush. Trimmed and straight doll head a was produced.
(2) Production of doll head b (curl hair)

A curled hair doll head b was manufactured in the same manner as the doll head a except that the used fiber was changed to the 13 mmφ curled fiber obtained in the examples and comparative examples.
(3) Texture evaluation

  Five doll heads a and b were arranged side by side in a state of being fixed to a fixed rod, and the following sensory evaluations were performed on their texture by 20 monitors. The evaluation contents and evaluation criteria are as follows.

<Evaluation of gloss>
・ When observing from different angles, shine changes and feels natural luster close to human hair: 3 points ・ When observing from different angles, shine changes slightly and feels near natural luster: When observing at 2 points / angles, the brightness is uniform and the artificial luster is felt: 1 point

Next, the scores given by 20 monitors were simply averaged to obtain an evaluation score, and gloss was evaluated according to the following criteria.
3.0 points or less 2.5 points or more: A
Less than 2.5 points 2.0 points or more: B
Less than 2.0 and 1.0 or more: C

<Evaluation of hue>
・ Deep in color tone, feels natural hue close to human hair: 3 points ・ Slightly changes in color tone, feels close to natural color: 2 points ・ Uniform color tone, feels artificial color: 1 point

Next, the evaluation score was obtained by simply averaging the scores assigned to each of the 20 monitors, and the hue was evaluated according to the following criteria.
3.0 points or less 2.5 points or more: A
Less than 2.5 points 2.0 points or more: B
Less than 2.0 and 1.0 or more: C

<Evaluation of touch feeling>
・ Changes in softness and skin feel, feels a natural touch close to human hair: 3 points ・ Slight changes in softness and skin feel, feels close to nature: 2 points ・ Softness and skin feel A uniform, artificial feel: 1 point

Next, the score given by 20 monitors was simply averaged to obtain an evaluation score, and the touch feeling was evaluated according to the following criteria.
3.0 points or less 2.5 points or more: A
Less than 2.5 points 2.0 points or more: B
Less than 2.0 and 1.0 or more: C

<Comprehensive evaluation criteria for texture>
・ Evaluation results of the above gloss, hue, and touch feeling, A is 2 or more and C is not present: ◎
・ Evaluation results for gloss, hue, and touch, with one A and no C: ○
・ Evaluation results of the above gloss, hue, and touch feeling, with one C: Δ
・ Evaluation results of the above gloss, hue, and feel, and those having 2 or more C: ×
《Curlability》

Using the same curling apparatus as shown in FIG. 2, the fibers obtained in Examples and Comparative Examples were each taken out from the 4 kg roll / main bobbin under the conditions of a rotation speed of 4000 rpm and a heating bath temperature of 180 ± 5 ° C. 15 mmφ curled product was continuously produced. At that time, the number of occurrences (number of times / per bobbin) of running abnormalities (clogging and twisting of the yarn bundle) of the coiled yarn on the core rod 4 was observed and evaluated according to the following evaluation criteria.
Less than once: ◎
1 to less than 3 times: ○
3 times or more and less than 5 times:
3 times or more: ×
《Flocking processability》

To a spherical doll head having a diameter of 2.5 cm made of a vinyl chloride sheet (thickness 1 mm), a doll flocking sewing machine similar to that shown in FIG. 3 (DOLLY CO. LTD, trade name: TUNF-28B, Using a planting speed of 1000 RPM and a fiber cut length of 20 cm), the fibers obtained in the examples and comparative examples were each about 7 cm ² from the top of the doll head to the back of the head (vertical part) and the side of the head (vertical part). The area was flocked. The number of yarn breaks that occurred at the time of flocking per 100 doll heads was counted as the yarn breakage occurrence rate (%), and this was used to evaluate the following criteria.
Less than 1%: ◎
1% or more and less than 5%: ○
5% or more and less than 10%: △
10% or more: ×
《Brushing non-hair removal property》

To a spherical doll head having a diameter of 2.5 cm made of a vinyl chloride sheet (thickness 1 mm), a doll flocking sewing machine similar to that shown in FIG. 3 (DOLLY CO. LTD, trade name: TUNF-28B, Using a planting speed of 1000 RPM and a fiber cut length of 20 cm), the fibers obtained in the examples and comparative examples were each about 7 cm ² from the top of the doll head to the back of the head (vertical part) and the side of the head (vertical part). The area was flocked.

Furthermore, the above-mentioned doll head that has been planted is fixed to the top of a fixed rod 30 cm long standing vertically from the ground, and the hair is made commercially available at a room temperature of 23 ° C. and a humidity of 80% RH. After brushing 20 times under, the weight of the hair that was removed was measured, and the hair removal ratio was determined and evaluated according to the following evaluation criteria.
Less than 1 wt%: ◎
1 wt% or more and less than 3 wt%: ○
3 wt% or more and less than 5 wt%: △
5 wt% or more: ×
[Examples 1 to 3]

A resin powder obtained by polymerizing and drying a vinylidene chloride-vinyl chloride monomer mixture consisting of 85% by weight of vinylidene chloride and 15% by weight of vinyl chloride according to a conventional method is classified to obtain spherical powder A (average A particle size of 180 μ) and spherical powder B (average particle size of 330 μ) were prepared. Separately, an amorphous powder C (outer diameter: about 1 to 3 mm) obtained by pulverizing a film-like material that was compressed by applying a temperature near the melting point to these spherical powders for a short time was prepared. These were mixed at the blending ratios shown below to form three types of mixtures. Next, for each mixture, a plasticizer (acetotributyl citrate: 3% by weight), a heat stabilizer (epoxidized linseed oil: 2) %), Pigment (carbon black: 0.25% by weight, Pigment Blue 15: 0.05% by weight), and additives (glyceride stearate: 0.03% by weight, talc: 0.3% by weight) Then, the following three types of resin compositions (I to III) were prepared.
Resin blending ratio = spherical powder A / spherical powder B = 60/40... Resin composition (I)
Resin blending ratio = spherical powder B / indeterminate powder C = 80/20 resin composition (II)
Resin blending ratio = spherical powder A / amorphous powder C = 70/30 resin composition (III)

  Each resin composition was melt-spun from a hollow nozzle at an extrusion temperature of 183 ° C. using a single screw extruder [screw diameter: D = 50 mm, full length: L = 1000 mm, metering section length = 200 mm], and cooled. After quenching in a water tank, it was stretched 4 times with a speed difference roller to produce a multifilament consisting of 10 black single yarns having a hollow circular cross section and an average outer diameter of about 70 μm (hollow rate of about 15%).

About three types of obtained fibers, U%, the texture of doll hair, curl processability, flocking processability, and brushing hair removal property were evaluated. The results are shown in Table 1. It was confirmed that all of the obtained fibers were doll hairs having a natural texture close to that of human hair, and had excellent properties such as curling property, flocking property, and practical strength.
[Comparative Examples 1-2]

The blending ratio of the spherical powder A, spherical powder B, and amorphous powder C in Examples 1 and 3 was changed as shown below, and the same plasticizer, stabilizer, pigment and additive as in Example 1 were used. The following two types of resin compositions were obtained by mixing.
・ Resin blending ratio = spherical powder A / spherical powder B = 90/10... Resin composition (IV)
Resin blending ratio = spherical powder A / indeterminate powder C = 50/50... Resin composition (V)

Using each resin composition, multifilaments consisting of 10 black single yarns were obtained in the same manner as in Example 1, and each evaluation was performed. The results are shown in Table 1. The fiber (Comparative Example 1) comprising the resin composition (IV) was inferior in texture, and was unsatisfactory as a high-grade doll hair. Moreover, the fiber (comparative example 2) which consists of resin composition (V) had a problem in workability, and its practical strength was also low.
[Example 4]

A multifilament composed of 10 black single yarns was obtained by the same method as in Comparative Example 1 except that the extrusion temperature was lowered to 178 ° C. The fiber was evaluated for U%, texture of doll hair, curl processability, flocking processability, and brushing hair removal. The results are shown in Table 1. The obtained fiber was improved in texture and became satisfactory as a doll hair.
[Example 5]

  A multifilament consisting of 10 black single yarns was produced in the same manner as in Comparative Example 2 except that the single screw extruder [screw diameter: D = 50 mm, full length: L = 1200 mm, weighing section length = 250 mm] was changed. Obtained. The fibers were evaluated for U%, texture of doll hair, curl processability, flocking processability, and brushing hair removal. The results are shown in Table 1. The obtained fiber was improved in processability and practical strength, and was satisfactory as a doll hair.

It is a schematic diagram of the example of the nonuniformity curve which showed the fluctuation | variation of the fineness. It is the schematic diagram which showed the example of schematic structure of the curling apparatus. It is the schematic diagram which showed the example of schematic structure in the case of flocking using a flocking sewing machine.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Resin bag 2 Curled doll hair fiber 3 Mandrel 4 Heater 5 Curling machine head 6 Pipe thread path 7 Fiber wound around bobbin 8 Flocked sewing machine body

9 Doll Head 10 Sewing Needle 11 Rotating Pipe Yarn 12 Planted Doll Hair 13 Doll Hair Fiber Wrapped on Bobbin 14 Unrolled Doll Hair Fiber

Claims (2)

  A doll hair fiber made of a vinylidene chloride resin and having an average deviation rate of fineness in the range of 4.5-15.   The method for producing a fiber for a doll hair according to claim 1, wherein the spinning is carried out while causing a variation with time in the amount of extrusion, followed by cooling.

Images