US20090126749A1 - Artificial hair and wig using the same - Google Patents

Artificial hair and wig using the same Download PDF

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Publication number
US20090126749A1
US20090126749A1 US11/816,084 US81608406A US2009126749A1 US 20090126749 A1 US20090126749 A1 US 20090126749A1 US 81608406 A US81608406 A US 81608406A US 2009126749 A1 US2009126749 A1 US 2009126749A1
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United States
Prior art keywords
artificial hair
hair
sheath
bending
humidity
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Abandoned
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US11/816,084
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English (en)
Inventor
Yutaka Shirakashi
Takayuki Watanabe
Osamu Asakura
Akemi Irikura
Kazumi Il
Mutsuko Watanabe
Hiromi Kojima
Fumitaka Sugawara
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Aderans Co Ltd
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Aderans Co Ltd
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Assigned to ADERANS HOLDINGS CO., LTD. reassignment ADERANS HOLDINGS CO., LTD. CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). Assignors: ADERANS CO., LTD.
Assigned to ADERANS HOLDINGS CO., LTD. reassignment ADERANS HOLDINGS CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: ASAKURA, OSAMU, II, KAZUMI, IRIKURA, AKEMI, KOJIMA, HIORMI, SHIRAKASHI, YUTAKA, SUGAWARA, FUMITAKA, WATANABE, MUTSUKO, WATANABE, TAKAYUKI
Publication of US20090126749A1 publication Critical patent/US20090126749A1/en
Assigned to UNIHAIR CO., LTD. reassignment UNIHAIR CO., LTD. CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). Assignors: ADERANS HOLDINGS CO., LTD.
Abandoned legal-status Critical Current

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    • A—HUMAN NECESSITIES
    • A41—WEARING APPAREL
    • A41G—ARTIFICIAL FLOWERS; WIGS; MASKS; FEATHERS
    • A41G3/00—Wigs
    • A41G3/0083—Filaments for making wigs
    • A—HUMAN NECESSITIES
    • A41—WEARING APPAREL
    • A41G—ARTIFICIAL FLOWERS; WIGS; MASKS; FEATHERS
    • A41G3/00—Wigs
    • A—HUMAN NECESSITIES
    • A41—WEARING APPAREL
    • A41G—ARTIFICIAL FLOWERS; WIGS; MASKS; FEATHERS
    • A41G5/00—Hair pieces, inserts, rolls, pads, or the like; Toupées
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
    • D01D10/00—Physical treatment of artificial filaments or the like during manufacture, i.e. during a continuous production process before the filaments have been collected
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
    • D01F8/00—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof
    • D01F8/04—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof from synthetic polymers
    • D01F8/12—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof from synthetic polymers with at least one polyamide as constituent

Definitions

  • This invention relates to artificial hair having physical properties and feeling similar to natural hair and a wig using the same.
  • Wigs have been manufactured and used since ancient age with natural hair as the material, but recently such problems as the supply limitation of natural hair material and others caused the manufacture to increase using synthetic fibers as hair material for wigs.
  • the synthetic fiber to be used is selected with the primary target that it is basically close to natural hair in terms of feeling and physical properties.
  • the artificial hair materials to be used are synthetic fibers of acrylic, polyester, and polyamide in many cases, but acrylic fibers in general have low melting point and poor heat stability, so that they have such weak points as poor shape preservation after permanent wave setting, resulting in distortion of setting, for example, such as curl and the like when soaked in warm water.
  • Polyester fibers excel in strength and heat stability, but have too high rigidity for bending, in addition to extremely low moisture absorbency compared with natural hair, resulting in appearance, feeling, or physical properties different from natural hair, for example, in the environment of high humidity, and they give markedly uncomfortable feeling when used for wigs.
  • the rigidity for bending is the property relating to such feeling as tactile and texture of fibers, and is widely recognized in fiber and textile industries as such that capable of numerical expression by KAWABATA method of measurement (See Non-Patent Reference 1). Also, an apparatus has been developed which can measure the rigidity for bending using a single strand of fiber or hair (See Non-Patent Reference 2).
  • rigidity for bending may be called “bending rigidity”, is also called bending hardness, and is defined as the reciprocal number of curvature change generated when a unit bending moment is applied to artificial hair. The larger the rigidity for bending of artificial hair, the less bendable, the more resistant to bending, that is, the harder and the less bendable is artificial hair. On the other hand, the smaller the rigidity for bending, the more bendable and the softer is artificial hair.
  • polyamide fibers can offer appearance and physical properties similar to natural hair in many aspects, they have so far been in practical use as the hair for wigs, and especially, the invention by the present applicant of the method of manufacture which can remove unnatural gloss by surface processing provides excellent wigs (See Patent Reference 1).
  • Polyamide fibers include linear saturated aliphatic polyamides in which only methylene chains are connected with amide bonds as a main chain, for example, such as nylon 6 and nylon 66, and semi-aromatic polyamides in which phenylene units are included in the main chain, for example, such as nylon 6T of TOYOBO, LTD. and MXD6 of MITSUBISHI GAS CHEMICAL COMPANY, INC.
  • Patent Reference 1 discloses surface-processed artificial hair of nylon 6 fiber as the material, but only nylon 6 fiber has the rigidity for bending lower than natural hair as the property relating to such feeling as tactile and texture, and hence it is difficult to manufacture the artificial hair of the same property as natural hair.
  • the artificial hair using nylon 6T has the rigidity for bending higher than the natural hair, and hence it is difficult to manufacture the hair of the same property as natural hair. Therefore, it might be considered to manufacture the fiber having the rigidity for bending close to natural hair by melt-spinning of nylon 6 and nylon 6T, but these two resins have too different melting points, and if melting temperature is determined fitting to nylon 6T of higher melting point, then there is too serious a problem in the manufacturing process that nylon 6 having low melting point and relatively poor heat stability is deteriorated by thermal oxidation during melting. Consequently, nylon 6T has not so far been in practical use as an artificial hair material.
  • the fiber of sheath/core structure is known as a method to utilize both properties of two kinds of resins.
  • Said fiber comprises as one strand of fiber a core fiber and a sheath fiber surrounding it, and can be a generic fiber, or artificial hair material for wigs, by utilizing respective properties of different two kinds of resins.
  • Patent Reference 2 discloses the fiber of sheath/core structure made of vinylidene chloride, polypropylene, and others
  • Patent Reference 3 discloses a polyamide, but modified fiber by blending protein bridged gel into the core part.
  • Patent Reference 1 discloses the method of making uneven surface by causing spherocrystal to be generated and grow, and Patent Reference 4 by treating the fiber surface with chemical reagents.
  • Patent Reference 4 by treating the fiber surface with chemical reagents.
  • the method of blast-treating of the artificial hair surface with fine powders such as sand, ice, and dry-ice.
  • Non-Patent Reference 1 Sen'ikikai Gakkaishi (Journal of Textile Machine Society, Textile Engineering), Sueo KAWABATA, 26, 10, pp. 721-728, 1973
  • Non-Patent Reference 2 KATOTECH LTD., Handling Manual of KES-SH Single Hair Bending Tester
  • Artificial hair to be used for wigs is required primarily to have feeling (appearance, tactile and texture) and physical properties close to natural hair, and in addition, ideally speaking, the physical properties superior to natural hair.
  • various synthetic fiber materials have their own merits and weak points, respectively, and among them, specific polyamide fibers, especially nylon 6 and nylon 66, are in practical use because of their superior properties, but they still have a problem of having rigidity for bending lower than natural hair.
  • An object of the present invention is, in view of the above-mentioned problems, to provide an artificial hair having feeling (appearance, tactile and texture) and physical properties close to natural hair, and a wig using it.
  • the present inventors have completed the present invention, as the result of strenuous study, by utilizing the characteristics of polyamide fibers to make a core portion with a polyamide fiber of high rigidity for bending, and a sheath portion with a polyamide fiber of the rigidity for bending lower than the core portion, and by attaining the knowledge that the sheath/core structure, that is, the structure comprising a core fiber and the sheath fiber surrounding it, can utilize the characteristics of both resins to be optimal as an artificial hair of the feeling (appearance, tactile and texture) and physical properties quite close to natural hair.
  • an artificial hair of the present invention is characterized to have a sheath/core structure comprising a core portion and a sheath portion covering the core portion, wherein the core is made of a polyamide resin, and the sheath is made of the polyamide resin of the rigidity for bending lower than the core portion.
  • the surface of the artificial hair is preferably deglossed by having fine concave and convex portions.
  • Fine concave and convex portions may be made by forming spherocrystal and/or a blast processing.
  • the core portion is preferably made of a semi-aromatic polyamide resin, and the sheath portion is made of a linear saturated aliphatic polyamide.
  • a semi-aromatic polyamide resin is preferably an alternating copolymer of hexamethylenediamine and terephthalic acid, or an alternating copolymer of metaxylylenediamine and adipic acid, and a linear saturated aliphatic polyamide is a caprolactam ring-opening polymer, and/or an alternating copolymer of hexamethylenediamine and adipic acid.
  • the sheath/core weight ratio is preferably 10/90-35/65.
  • the artificial hair may contain pigment and/or dye.
  • the artificial hair of the present invention has a double structure of a core portion and a sheath portion surrounding it, and since they are made of polyamide resins of different rigidities for bending, the artificial hair can be provided which has rigidity for bending quite close to that of natural hair with respect to humidity change. Therefore, since said artificial hair has the rigidity for bending close to that of natural hair, natural artificial hair can be provided which has such feeling as appearance, tactile and texture quite close to natural hair, thereby its rigidity for bending changes especially by temperature and humidity resulting in the behavior close to human hair.
  • a wig of the present invention is characterized in that it comprises a wig base and artificial hair attached or tied to the wig base, such artificial hair as has a sheath/core structure made of a core portion and a sheath portion covering the core, the core portion is made of a polyamide resin, and the sheath portion is made of a polyamide resin of the rigidity for bending lower than the core portion.
  • a wig By using the artificial hair of the above-mentioned structure for a wig of the present invention, a wig can be provided which shows the behavior quite close to that by the rigidity for bending of natural hair to humidity change. Therefore, since the artificial hair has good hair standing, and its rigidity for bending is close to that of natural hair, a wig of natural appearance, and quite excellent in such feeling as appearance, tactile and texture can be obtained. Consequently, with the artificial hair of the rigidity for bending changing in accordance with temperature and humidity, and showing the behavior closer to human hair than the conventional hair, such appearance is given that of the wearer's own hair naturally growing on the head, and the wearer would not expose the wig wearing.
  • the artificial hair can be provided which has a sheath/core structure, and has feeling (appearance, tactile and texture), various physical properties, especially rigidity for bending and its changing behavior by humidity close to those of natural hair.
  • the wig using the artificial hair having said sheath/core structure can provide natural feeling to the wearer and the surrounding observers more than the conventional wig using artificial hair made of a single synthetic fiber material.
  • the artificial hair when worn in the rain, or under the environment of high humidity, the artificial hair softens, hangs down, and its bulkiness disappears, by the change characteristics of rigidity for bending by moisture absorption of artificial hair, that is, lowering of rigidity for bending with humidity rise, and when the absorbed water is released by natural standing or drying, artificial hair stands up gradually to return to the original state.
  • a wig since a wig can be obtained which shows the same behavior as if natural hair is growing on a scalp, it can be a wig of excellent appearance, hard to recognize as a wig.
  • FIG. 1 diagrammatically illustrates a structure of an artificial hair in accordance with a first embodiment of the invention, and (A) is a diagonal view, and (B) is a vertical cross sectional view in the length direction of the artificial hair.
  • FIG. 2 is a cross sectional view in the length direction diagrammatically illustrating the structure of a modified example of the artificial hair of the present invention.
  • FIG. 3 is a diagrammatical drawing of a spinning machine used for manufacturing the artificial hair of the present invention.
  • FIG. 4 is a diagrammatical cross sectional view illustrating an outlet used for a spinning machine.
  • FIG. 5 is a diagonal view diagrammatically illustrating the structure of a wig using artificial hair in accordance with a second embodiment of the invention.
  • FIG. 6 is an enlarged view diagrammatically illustrating the behavior of the wig of FIG. 5 with respect to humidity change, and (A) shows an ordinary humidity state, and (B) shows a high humidity state.
  • FIG. 7 is a graph showing the stretching ratio dependency of rigidity for bending of the artificial hair of Example 3.
  • FIG. 8 is an image of the cross section of artificial hair of Example 2 by an electron microscope.
  • FIG. 9 is an image of the surface of artificial hair of Example 2 by an electron microscope.
  • FIG. 10 is an image of the cross section of artificial hair of Example 3 by an electron microscope.
  • FIG. 11 is a cross sectional image of artificial hair having a sheath/core structure of Comparative Example 3 by an electron microscope.
  • FIG. 12 is a graph showing the humidity dependency of rigidity for bending of the artificial hairs of Examples 1-5 and Comparative Examples 1 and 2.
  • FIG. 13 is a graph showing the humidity dependency of rigidity for bending of the artificial hairs of Examples 6-10 and Comparative Examples 1, 4, and 5.
  • FIG. 14 shows photographs of the initial states of curls of (A) the artificial hair of Example of the present invention, (B) the natural hair, and (C) the conventional artificial hair made of polyester.
  • FIG. 15 shows photographs of the water-soaked states of (A) the artificial hair of Example of the present invention, (B) the natural hair, and (C) the conventional artificial hair made of polyester.
  • FIG. 16 shows photographs of the dried states after water-soaking of (A) the artificial hair of Example of the present invention, (B) the natural hair, and (C) the conventional artificial hair made of polyester.
  • FIG. 1 diagrammatically illustrates the structure of an artificial hair in accordance with a first embodiment of the invention, and (A) is a diagonal view, and (B) is a vertical cross sectional view in the length direction of artificial hair.
  • the artificial hair 1 of the present invention has a sheath/core structure wherein its surface is a sheath portion 1 A, and a core portion 1 B is inside the sheath portion 1 A.
  • the sheath/core structure is illustrated with an example of nearly concentric circular arrangement, but it also includes the cases where both core 1 B and sheath 1 A have different shapes other than nearly concentric circles, for example, the core is eccentric with regard to the sheath, not being perfectly concentric circles. It may also be such a sheath/core shape as that the core is nearly a perfect circle while the sheath has varied thickness.
  • the cross sectional shape of artificial hair 1 may be circular, elliptic, or cocoon-shaped.
  • semi-aromatic polyamide resins of high strength and rigidity for bending can be properly used.
  • semi-aromatic polyamide such may be mentioned as the polymer consisting of an alternating copolymer of hexamethylenediamine and terephthalic acid, Nylon 6T for example, expressed in Chemical Formula 1, or the polymer in which adipic acid and metaxylylenediamine are alternately bonded, Nylon MXD6 for example, expressed in Chemical Formula 2.
  • polyamide resins for the material of said sheath portion 1 A polyamide resins of lower rigidity for bending than the core 1 B may be used, and a linear saturated aliphatic polyamide, for example, can be properly used.
  • a linear saturated aliphatic polyamide such may be mentioned as the polymer consisting of a ring-opening polymer of caprolactam, Nylon 6 for example, expressed in Chemical Formula 3, or the polymer consisting of an alternating copolymer of hexamethylenediamine and adipic acid, Nylon 66 for example, expressed in Chemical Formula 4.
  • the artificial hair of the present invention 1 has gloss, if the surface of the sheath 1 A is smooth. In order to erase this unnatural gloss on the surface of artificial hair 1 , so-called deglossing may be applied.
  • FIG. 2 is a cross sectional view in the length direction diagrammatically illustrating the structure of a modified example of artificial hair of the present invention.
  • a fine concave and convex portion 1 C is formed on the surface of the sheath portion 1 A of artificial hair 10 .
  • diffuse reflection occurs upon light irradiation to artificial hair 10 . Therefore, the gloss no longer occurs due to the reflection from light irradiation on the surface of artificial hair, bringing about so-called deglossing effect.
  • the fine concave and convex portion 1 C can be given by blast processing with fine powder such as sand, ice, dry-ice, and others either during spinning of the artificial hair 1 or on to the fiber after spinning.
  • fine powder such as sand, ice, dry-ice, and others
  • it may be by spherocrystal forming on the outermost surface of artificial hair 1 .
  • it may be the combined processes of spherocrystal forming and blast processing with fine powder such as said sand, ice, dry-ice, and others.
  • the concave and convex portion formed by combination of such spherocrystal formation and blast processing may be formed to be the concave and convex portion 1 C larger than the order of visible light wavelength so the light is diffuse reflected.
  • the artificial hair 1 , 10 of the present invention can be dyed depending upon the wearer's preference. Said dying may be by formulating pigment and/or dye during polymer kneading as the material for spinning, or by dying artificial hair after spinning.
  • the artificial hair 1 , 10 of the present invention by making a sheath/core structure with the polyamide of high rigidity for bending used for the core 1 B, and with the polyamide of the rigidity for bending lower than the core 1 B used for the sheath 1 A, artificial hair can be obtained the rigidity for bending of which is changed by temperature and humidity, and which shows behavior closer to the human hair than the conventional artificial hair. Also, with the artificial hair 10 having the fine concave and convex portion 1 C on the surface of the sheath portion 1 A, the deglossing effect is attained, and its properties and feeling are more approximated to those of artificial hair.
  • FIG. 3 is a diagrammatical drawing of a spinning machine used for manufacturing the artificial hair of the present invention
  • FIG. 4 is a diagrammatical cross sectional view illustrating a discharge part used for a spinning machine.
  • a spinning machine 20 comprises a first cylinder 21 of a polyamide resin for the sheath portion 1 A, a second cylinder 22 of a polyamide resin for the core portion 1 B, a discharge part 23 to discharge the melts 21 A, 22 A supplied from said cylinders 21 , 22 , a quenching bath 24 to solidify the melt thread discharged from an outlet 23 C of the discharge part 23 and to form a concave and convex portion on the surface, and thereafter via three steps stretching thermal treatment processing parts with each step comprising stretching rolls 25 , 27 , and 29 , and dry stretching baths 26 , 28 , and 30 , a blast machine 33 for forming further the concave and convex portion 1 C on the thread surface, and a rollup machine 34 to roll up the artificial
  • the cylinders 21 , 22 are provided with a heating device to melt polyamide resin pellets, screws for supplying to a kneader and the discharge part 23 , and gear pumps 21 B, 22 B to supply the melts 21 A, 22 A to the discharge part 23 .
  • the fiber from the outlet 23 C of the discharge part 23 goes, as shown in the figure, via a quenching bath, and stretching and dry stretching mechanisms, through an oiling device 31 for electrostatic prevention, a stretching roll 32 to relax the tension applied on the artificial hair to stabilize dimension, a blast machine 33 for surface processing, and to a rollup machine 34 .
  • the discharge part 23 is provided with a concentric circular double outlet from the inner circle part 23 B of which is discharged semi-aromatic polyamide resin melt 22 A, and from the outer ring part 23 A surrounding said inner circle part 23 B is discharged linear saturated aliphatic polyamide resin melt 21 A, respectively.
  • artificial hair 1 , 10 can be manufactured by melting each polyamide at appropriate temperature in cylinders 21 , 22 , feeding the melts to the discharge part 23 , and by discharging semi-aromatic polyamide resin melt 22 A form the inner circle part 23 B of the outlet and linear saturated aliphatic polyamide resin melt 21 A from the outer ring part 23 A to make the thread of sheath/core structure.
  • the ratio of the volume of the linear saturated aliphatic polyamide resin melt 21 A fed for a certain time with the gear pump 21 B and the volume of semi-aromatic polyamide resin melt 22 A fed with the gear pump 22 B is defined as sheath/core volume ratio in the present invention.
  • the weight ratio of sheath and core, the sheath/core weight ratio is preferably in the range of 10/90-35/65.
  • the sheath/core volume ratio is preferably 1/2-1/7, and this range is preferred for such properties as rigidity for bending of artificial hair 1 , 10 as mentioned below.
  • said sheath/core volume ratio is higher than 1/2, that is, the ratio of the sheath portion 1 A is large, the core portion 1 B of artificial hair 1 , 10 has small effect to contribute the increase of rigidity for bending.
  • said sheath/core volume ratio is lower than 1/7, that is, the ratio of the core portion 1 B is large, it is not preferred, for the rigidity for bending becomes too high to be close to the natural hair.
  • the stretching ratio may be 5-6 times upon spinning of the artificial hair 1 , 10 .
  • Said stretching ratio is about twice as high as that for the conventional artificial hair of nylon 6 only.
  • the artificial hair 1 , 10 of the present invention such as stretching ratio upon spinning, thread diameter, and rigidity for bending can be properly determined in accordance with the desired design.
  • the shape of sheath/core of artificial hair 1 , 10 can be made nearly concentric circular by properly controlling spinning conditions.
  • the artificial hair 10 can be manufactured by forming spherocrystal for the concave and convex portion 1 C on the surface of linear saturated aliphatic polyamide resin as the sheath portion 1 A by passing the thread drawn form the outlet 23 C through the water at 80° C. or higher in the quenching bath 24 , thereby giving appearance similar to the natural hair to the thread, and deglossing to erase an unnatural gloss.
  • any one of the methods of blasting with such fine particles as sand, ice, and dry-ice to the thread surface after spinning, or of chemical treatment of the thread surface, or proper combination of them may be adopted, in addition to the above-mentioned spherocrystal formation and growth.
  • the pigment and/or dye may be formulated during spinning, or the artificial hair 1 , 10 itself may be dyed after spinning.
  • the artificial hair 1 , 10 of the present invention has the sheath/core structure with polyamide resins of different rigidities for bending, the artificial hair 1 , 10 of the rigidity for bending higher than that of the conventional artificial hair of linear saturated aliphatic polyamide resin only can be manufactured with good reproducibility. Also, by forming the fine concave and convex portion 1 C on the surface of the artificial hair 1 , the natural gloss similar to the natural hair can be given, thereby so can the natural appearance as hair.
  • FIG. 5 is a diagonal view diagrammatically illustrating the structure of a wig using the artificial hair in accordance with a second embodiment of the invention.
  • a wig 40 using the artificial hair 1 , 10 of the present invention is that made by tying the artificial hair 1 or 10 to a wig base 41 .
  • the wig base 41 can be made of either a net base or an artificial skin base. In the case of the figure, the wig base 41 is shown to be attached or tied to a mesh of a net member.
  • the wig base 41 may be made by combination of a net base and an artificial skin base, and there is no special restriction so far as suitable to wig design or purpose of use.
  • the diameter of the artificial hair 1 , 10 may be about 0.05-0.1 mm.
  • the artificial hair 10 can be properly used of which the relative-specular glossiness is suppressed, and which has gloss similar to natural hair.
  • the color of the artificial hair 1 , 10 may be properly chosen according to the wearer's desire such as black, brown, and blond. Natural appearance is increased if the artificial hair is chosen of the color fitting to the wearer's own hair around the part falling out hair.
  • the artificial hair of the present invention may be made mesh-like by giving a color different from the wearer's own hair, or from a root portion to an end portion, gradation may be given such as, for example, dark and light tint or color is gradually changed.
  • FIG. 6 is an enlarged view diagrammatically illustrating the behavior of the wig of FIG. 5 with respect to humidity change, and (A) shows an ordinary humidity state, and (B) shows a high humidity state. In the figure, the case is shown where artificial hair is straight.
  • the artificial hair 1 , 10 attached or tied to the wig 40 of the present invention has rigidity for bending close to that of the natural hair. Therefore, under the ordinary environment where the humidity is about 40-60%, the artificial hair 1 , 10 has good standing, and gives bulkiness to the wig 40 .
  • the wig 40 of the present invention gets wet in the rain, or is worn in the environment of high humidity, the artificial hair becomes soft, and, as shown in FIG. 6(B) , hangs and loses bulkiness, due to the property of changing rigidity for bending by moisture absorption of the artificial hair attached or tied to the wig, that is, rigidity for bending is lowered with humidity increase. Further, when the absorbed water is released by natural standing or drying, the artificial hair 1 , 10 gradually stands up, and returns to the original state.
  • the curl extends like the natural hair, and, as in the case of straight hair, it returns to the original state when the absorbed water is released naturally or by drying.
  • the wig 40 of the present invention since the polyamide of high rigidity for bending is used for the core portion 1 B, and a polyamide of the rigidity for bending lower than the core portion 1 B for the sheath portion 1 A to make the artificial hair 1 , 10 of a sheath/core structure, and it is attached or tied to a wig base, the rigidity for bending is changed by temperature and humidity, and the wig with good appearance can be obtained which has feeling or behavior closer to natural hair. Further if the fine concave and convex portion 1 C is formed on its surface as the artificial hair, it gives appearance closer to natural hair by deglossing effect.
  • the artificial hair 1 , 10 uses the polyamide resin of good water absorption, thereby absorbs water, hangs down due to its weight increase, and shows the behavior similar to natural hair.
  • the artificial hair 10 of Example 1 was manufactured.
  • nylon 6T nylon 6T (TOYOBO, LTD.) was used, and as a polyamide resin for the sheath portion 1 A, nylon 6 (TOYOBO, LTD.) was used.
  • hot water 80° C. was used.
  • the sheath/core weight ratio was 12/88 for the artificial hair 10 of Example 1.
  • resin chips were used which were made by blending a polyamide resin used either for said sheath 1 A or for core 1 B and a pigment in pre-determined ratio, heating and melting, and cooling after kneading. These resin chips used as a coloring agent were defined as the master batch. As the master batch used in Example, the resin chips containing 3 weight % black inorganic pigment, the resin chips containing 3 weight % yellow organic pigment, and the resin chips containing 4 weight % red organic pigment were used.
  • nylon 6 chips as the material for the sheath 1 A 84 g, a black master batch 5 g, yellow 10 g, red 1 g, total 100 g of melt resin 21 A was first fed into the first cylinder 21 and nylon 6T chips as the material for the core 1 B 84 g, a black master batch 5 g, yellow 10 g, red 1 g, total 100 g of melt resin 22 A was fed into the second cylinder 22 .
  • Nylon 6T was fed with the gear pump 22 B to the inner outlet 23 B of the discharge part 23 , and nylon 6 was fed with the gear pump 21 B to the outer outlet 23 A, respectively, and extrusion volume ratio was made 1/7 as sheath/core ratio by adjusting rotations of gear pumps 21 B and 22 B.
  • the spinning machine was that spun 15 strands of fibers through the outlet of 15 holes.
  • the fiber of the sheath/core structure coming out of the outlet 23 C was passed through the quenching bath 24 of 1.5 m length and was filled with 80° C. warm water to form spherocrystal on the surface.
  • the fiber surface was made coarse by blasting fine alumina powder onto the surface through the fourth stretching roll 32 and the blast machine 33 , and rolled up to the rollup machine 34 .
  • the speeds of the first to the fourth stretching rolls 25 , 27 , 29 , 32 were adjusted so to make stretching ratio 5.5, and rollup rate 150 m/min in this process.
  • the artificial hair 10 of the sheath/core structure was manufactured by the same condition as Example 1, except that the sheath/core volume ratio was made 1/5 by adjusting respective gear pumps 21 B and 22 B.
  • the sheath/core weight ratio of the artificial hair 10 of Example 2 was 16.1/83.9.
  • the artificial hair 10 of the sheath/core structure was manufactured by the same condition as Example 1, except that the sheath/core volume ratio was made 1/3 by adjusting respective gear pumps 21 B and 22 B.
  • the sheath/core weight ratio of the artificial hair 10 of Example 3 was 24.2/75.8, and its diameter was 80 ⁇ m.
  • FIG. 7 is a graph showing the stretching ratio dependency of rigidity for bending of the artificial hair 10 of Example 3.
  • an abscissa axis shows a stretching ratio
  • an ordinate axis shows rigidity for bending: 10 ⁇ 5 gfcm 2 /strand.
  • the measurement condition was temperature 22° C. and humidity 40%.
  • the rigidities for bending for stretching ratios 3 and 5.5 were 430 ⁇ 10 ⁇ 5 gfcm 2 /strand and 720 ⁇ 10 ⁇ 5 gfcm 2 /strand, showing that rigidity for bending increased linearly with the increase of stretching ratio.
  • the artificial hair 10 of the sheath/core structure was manufactured by the same condition as Example 1, except that the sheath/core volume ratio was made 1/2 by adjusting respective gear pumps 21 B and 22 B.
  • the sheath/core weight ratio of the artificial hair 10 of Example 4 was 32.3/67.7.
  • the artificial hair 10 of Example 5 was manufactured by the same condition as Example 1, except that nylon 66 (MITSUBISHI ENGINEERING PLASTICS, LTD.) was used as a polyamide resin for the sheath 1 A, and temperature was 92° C. for the quenching bath 24 , and 320° C. for the outlet.
  • the sheath/core weight ratio of the artificial hair 10 of Example 5 was 16.2/83.8.
  • the artificial hair 10 of Example 6 was manufactured by the same condition as Example 1, except that nylon MXD6 (MITSUBISHI GAS CHEMICAL COMPANY, INC.) was used as a polyamide resin for the core 1 B, nylon 6 (MITSUBISHI ENGINEERING PLASTICS, LTD.) was used as a polyamide resin for the sheath 1 A, the temperature for the outlet was 270° C., and the sheath/core volume ratio was made 1/7. The sheath/core weight ratio of the artificial hair 10 of Example 6 was 11.8/88.2.
  • nylon MXD6 was used instead of nylon 6T used for the core 1 B of Examples 1-5. Here, it was drawn using a hot water stretching bath of 95° C.
  • Example 1 instead of a first dry stretching bath 26 of Example 1, and did heat-set in the second dry stretching bath 28 of 150° C., annealed for thread diameter size stabilization by passing through the third stretching roll 29 and the third dry stretching bath 30 at 185° C., and was passed through the oiling device 31 for electrostatic prevention.
  • the final step to make the fiber surface of artificial hair coarse was conducted as in Example 1.
  • the speeds of the first to the fourth stretching rolls 25 , 27 , 29 , 32 were adjusted so to make stretching ratio 5.6, and rollup rate 150 m/min in this process. All the diameters of thus manufactured artificial hairs 10 were in the range between 40 and 80 ⁇ m.
  • the artificial hair 10 of Example 7 was manufactured by the same condition as Example 6, except that the sheath/core volume ratio was made 1/5.
  • the sheath/core weight ratio of the artificial hair 10 of Example 7 was 15.8/84.2.
  • the artificial hair 10 of Example 8 was manufactured by the same condition as Example 6, except that the sheath/core volume ratio was made 1/4.
  • the sheath/core weight ratio of the artificial hair 10 of Example 8 was 18.9/81.1.
  • the artificial hair 10 of Example 9 was manufactured by the same condition as Example 6, except that the sheath/core volume ratio was made 1/3.
  • the sheath/core weight ratio of the artificial hair 10 of Example 9 was 23.8/76.2.
  • the artificial hair 10 of Example 10 was manufactured by the same condition as Example 6, except that the sheath/core volume ratio was made 1/2.
  • the sheath/core weight ratio of the artificial hair 10 of Example 10 was 31.8/68.2.
  • the manufacturing conditions of the above-described Examples 6-10 are shown in Table 2, where all the diameters of the artificial hairs 10 were in the range between 40 and 80 ⁇ m.
  • the thread of diameter 80 ⁇ m and stretching ratio 3.3 without sheath structure was manufactured with nylon 6, using the same spinning machine as Example 1, at the outlet temperature 270° C., and without using the first cylinder 21 .
  • the thread of diameter 80 ⁇ m and stretching ratio 5.5 without sheath structure was manufactured with nylon 6T, using the same spinning machine as Example 1, at the outlet temperature 310° C., and without using the first cylinder 21 .
  • the thread of a sheath/core volume ratio 1/1, thread diameter 80 ⁇ m and ratio 5.5 was manufactured with polyester (TORAY, LTD.) for the core portion 1 B, and nylon 6 for the sheath portion 1 A, using the same spinning machine as Example 1, at the outlet temperature 290° C.
  • the thread of diameter 80 ⁇ m and stretching ratio 5.6 without sheath structure was manufactured with nylon MXD6 by the same condition and method as Example 6, using the same spinning machine as Example 1, at the outlet temperature 270° C., and without using a first cylinder 21 .
  • the thread of diameter 80 ⁇ m and stretching ratio 5.6 without sheath structure was manufactured with the mixed polyamides of nylon MXD6 and nylon 6 by the same condition and method as Example 6, using the same spinning machine as Example 1 at the outlet temperature 270° C., and without using the first cylinder 21 .
  • the weight ratio of nylon MXD6 and Nylon 6 was 90:10.
  • the pigment formulation ratio was same in all Comparative Examples 1-5, and that of black, yellow, and red was 0.15%, 0.30%, and 0.04%, respectively.
  • the manufacturing conditions are shown in Table 3.
  • Table 4 shows the humidity dependency of rigidity for bending, which hereinafter may call “bending rigidity”, at 22° C. of the artificial hairs manufactured by using a single polyamide of nylon 6 in Comparative Example 1, nylon 6T in Comparative Example 2, and nylon MXD6 in Comparative Example 4.
  • the rigidity for bending was measured using a single hair bending tester (KATOTECH, LTD.) as will be described below.
  • the rigidities for bending of artificial hair of nylon 6 in Comparative Example 1 were 510 ⁇ 10 ⁇ 5 gfcm 2 /strand, 340 ⁇ 10 ⁇ 5 gfcm 2 /strand, and 250 ⁇ 10 ⁇ 5 gfcm 2 /strand, respectively, at humidity 40, 60, and 80%.
  • the rigidity for bending and its humidity dependency of artificial hair using nylon 66 were about the same as those of nylon 6.
  • the rigidities for bending of artificial hair of nylon 6T in Comparative Example 2 were 980 ⁇ 10 ⁇ 5 gfcm 2 /strand, 920 ⁇ 10 ⁇ 5 gfcm 2 /strand, and 860 ⁇ 10 ⁇ 5 gfcm 2 /strand, respectively, at humidity 40, 60, and 80%.
  • the rigidities for bending of the artificial hair of nylon MXD6 in Comparative Example 4 were 940 ⁇ 10 ⁇ 5 gfcm 2 /strand, 870 ⁇ 10 ⁇ 5 gfcm 2 /strand, and 780 ⁇ 10 ⁇ 5 gfcm 2 /strand, respectively, at humidity 40, 60, and 80%. It is seen from these results that the artificial hairs using nylon 6T and nylon MXD6 showed higher rigidity for bending than those using nylon 6 or nylon 66.
  • the artificial hairs of Examples 1-10 has the core portion 1 B made of a polyamide resin consisting of nylon 6T or nylon MXD6 of high rigidity for bending, and the sheath portion 1 A made of a polyamide resin consisting of nylon 6 or nylon 66 of lower rigidity for bending than the core portion 1 B.
  • FIG. 8 is an image of the cross section of artificial hair of Example 2 by an electron microscope.
  • the electron accelerating voltage was 15 kV, and magnification was 800.
  • the sheath/core volume ratio of this artificial hair 10 was 1/5, its diameter 80 ⁇ m, and the stretching ratio was 5.5.
  • the sheath/core structure was formed with the semi-aromatic polyamide (nylon 6T) as the core portion 1 B and the linear saturated aliphatic polyamide (nylon 6) as the sheath portion 1 A around it.
  • FIG. 9 is an image of the surface of artificial hair of Example 2 by an electron microscope.
  • the electron accelerating voltage was 15 kV, and magnification was 700.
  • spherocrystals were formed and grew on the linear saturated aliphatic polyamide, nylon 6, of the surface to give fine concave and convex portion 1 C to the surface.
  • FIG. 10 is an image of the cross section of artificial hair of Example 3 by an electron microscope.
  • the electron accelerating voltage was 15 kV, and magnification was 900.
  • the sheath/core volume ratio of this artificial hair 10 was 1/3, its diameter 80 ⁇ m, and stretching ratio 5.5.
  • the sheath/core structure was formed with the semi-aromatic polyamide, nylon 6T, as the core portion 1 B and the linear saturated aliphatic polyamide, nylon 6, as the sheath portion 1 A around it.
  • FIG. 11 is a cross sectional image of artificial hair having the sheath/core structure of Comparative Example 3 by an electron microscope.
  • the electron accelerating voltage was 15 kV, and magnification was 300.
  • the artificial hair of Comparative Example 3 had the sheath/core structure consisting of the core portion 1 B of polyester and the sheath portion 1 A of linear saturated aliphatic polyamide, nylon 6.
  • the sheath/core volume ratio was 1/1, the thread diameter 80 ⁇ m, and stretching ratio 5.5.
  • peeling off was detected at the interface of the core 1 B and a sheath 1 A, the fiber was white-brownish, and the dyed color was changed, so that it turned out that such a sheath/core structure is not suitable to the artificial hair.
  • the rigidity for bending is the physical property applied in general to fiber and others, and is recognized recently, also for hair, as the property relating to such feeling as appearance, tactile and texture etc.
  • KAWABATA method and its principle has been well known for textile, and the rigidity for bending of the artificial hair was measured using the single hair-bending tester (KATOTECH, LTD., Model KES-FB2-SH), which applies the method.
  • the measurement methods in cases of Examples and Comparative Examples of the present invention for both artificial and natural hairs are such that bending the whole hair of each one strand of 1 cm as a circular arc at an equal rate to a certain curvature, detecting a minute bending moment accompanying it, thereby measuring the relationship of the bending moment and the curvature.
  • the representative measurement conditions are shown below.
  • Torque Sensitivity 1.0 gf ⁇ cm (at Full Scale 10 V)
  • a chuck is a mechanism for clipping said each hair of 1 cm.
  • FIG. 12 is a graph showing the humidity dependency of rigidity for bending of the artificial hairs of Examples 1-5 and Comparative Examples 1 and 2.
  • the abscissa axis shows humidity (%)
  • the ordinate axis shows rigidity for bending (10 ⁇ 5 gfcm 2 /strand).
  • the measurement temperature was 22° C.
  • the humidity dependency of rigidity for bending of the artificial hair of Examples and Comparative Examples is shown together with that of natural hair. Since natural hairs have wide personal deviation, hairs were collected from 25 males and 38 females of respective ages between 20 and 50 years old, rigidities for bending of the samples of 80 ⁇ m diameter were measured, and their average was defined as a standard value.
  • the maximum value of rigidity for bending of natural hair was 740 ⁇ 10 ⁇ 5 gfcm 2 /strand and 600 ⁇ 10 ⁇ 5 gfcm 2 /strand for humidity 40 and 80%, respectively, and its minimum value was 660 ⁇ 10 ⁇ 5 gfcm 2 /strand and 420 ⁇ 10 ⁇ 5 gfcm 2 /strand for humidity 40 and 80% respectively, and thus the rigidity for bending of natural hair has wide deviation.
  • the artificial hair 10 of Example 1 had a thread diameter of 80 ⁇ m, and the sheath/core volume ratio of 1/7. Its rigidity for bending was 740 ⁇ 10 ⁇ 5 gfcm 2 /strand for humidity 40%, equal to the maximum value of natural hair, and it gradually decreases with humidity increase, lowering to about 700 ⁇ 10 ⁇ 5 gfcm 2 /strand for humidity 60%, and to about 650 ⁇ 10 ⁇ 5 gfcm 2 /strand for humidity 80%.
  • the artificial hair 10 of Example 2 had a thread diameter of 80 ⁇ m, and the sheath/core volume ratio of 1/5. Its rigidity for bending was 720 ⁇ 10 ⁇ 5 gfcm 2 /strand for humidity 40%, equal to that of natural hair, and it gradually decreases to about 650 ⁇ 10 ⁇ 5 gfcm 2 /strand till humidity 45%. Then it stayed constant at about 650 ⁇ 10 ⁇ 5 gfcm 2 /strand for humidity between 45 and 60%. In the range of humidity 60-80%, rigidity for bending gradually decreased to about 600 ⁇ 10 ⁇ 5 gfcm 2 /strand for humidity 80%.
  • the difference of artificial hair 10 of Example 3 from Example 1 is that its sheath/core volume ratio was 1/3. Its rigidity for bending was 720 ⁇ 10 ⁇ 5 gfcm 2 /strand for humidity 40%, equal to natural hair, decreased in the humidity range 40-60% to about 520 ⁇ 10 ⁇ 5 gfcm 2 /strand for humidity 60%. In the humidity range 60-80%, it gradually decreased to about 480 ⁇ 10 ⁇ 5 gfcm 2 /strand for humidity 80%.
  • the difference of artificial hair 10 of Example 4 from Example 1 was that its sheath/core volume ratio was 1/2. Its rigidity for bending was 720 ⁇ 10 ⁇ 5 gfcm 2 /strand for humidity 40%, equal to natural hair, decreased in the humidity range 40-60% to about 510 ⁇ 10 ⁇ 5 gfcm 2 /strand for humidity 60%. In the humidity range 60-80%, it gradually decreased to about 390 ⁇ 10 ⁇ 5 gfcm 2 /strand for humidity 80%.
  • Example 5 The difference of artificial hair 10 of Example 5 from Example 1 is that its sheath portion was made of nylon 66, and all others were the same.
  • rigidity for bending was 780 ⁇ 10 ⁇ 5 gfcm 2 /strand for humidity 40%, higher than natural hair, and decreases about linearly in humidity range 40-50% to about 650 ⁇ 10 ⁇ 5 gfcm 2 /strand for humidity 50%.
  • humidity range 50-80% it decreased to about 600 ⁇ 10 ⁇ 5 gfcm 2 /strand with the slope about equal to Example 1.
  • the artificial hair of Comparative Example 1 was made of nylon 6, its thread diameter was 80 ⁇ m, and stretching ratio was 3.3.
  • the rigidity for bending was about 510 ⁇ 10 ⁇ 5 gfcm 2 /strand for humidity 40%, which was about 70% of natural hair. It decreased about monotonously with humidity increase to about 250 ⁇ 10 ⁇ 5 gfcm 2 /strand for humidity 80%. This value was about 50% of natural hair. It turned out that the rigidity for bending of Comparative Example 1 was considerably lower than natural hair or artificial hair of Examples 1-5 over the whole measured humidity range.
  • the artificial hair of Comparative Example 2 was made of nylon 6T, its thread diameter was 80 ⁇ m, and stretching ratio was 5.5.
  • rigidity for bending was about 980 ⁇ 10 ⁇ 5 gfcm 2 /strand for humidity 40%, about 136% of natural hair. It decreased about monotonously with humidity increase to about 860 ⁇ 10 ⁇ 5 gfcm 2 /strand for humidity 80%. This value was about 170% of natural hair. It turned out that rigidity for bending of Comparative Example 2 was considerably higher than the natural hair or the artificial hair of Examples 1-5 over the whole measured humidity range.
  • FIG. 13 is a graph showing the humidity dependency of the rigidity for bending of the artificial hairs of Examples 6-10 and Comparative Examples 1, 4, and 5.
  • the abscissa axis shows humidity (%)
  • the ordinate axis shows rigidity for bending (10 ⁇ 5 gfcm 2 /strand).
  • the measurement temperature was 22° C.
  • rigidities for bending of the natural hair were shown as average, maximum, and minimum values.
  • the difference of the artificial hair 10 of Example 6 from Example 1 was that its core portion 1 B was made of nylon MXD6, its thread diameter was 80 ⁇ m, and the sheath/core volume ratio was 1/7.
  • the rigidity for bending was 730 ⁇ 10 ⁇ 5 gfcm 2 /strand for humidity 40%, about equal to the average value of natural hair, and gradually decreased with humidity increase. It lowered to about 660 ⁇ 10 ⁇ 5 gfcm 2 /strand for humidity 60%, and about 600 ⁇ 10 ⁇ 5 gfcm 2 /strand for humidity 80%.
  • the rigidity for bending was 730 ⁇ 10 ⁇ 5 gfcm 2 /strand for humidity 40%, about equal to the average value of natural hair, and decreased as humidity increased to around 50% to 620 ⁇ 10 ⁇ 5 gfcm 2 /strand. Then it gradually lowered till humidity 60% to about 610 ⁇ 10 ⁇ 5 gfcm 2 /strand for humidity 60%. It further gradually decreased in humidity range 60-80% to 560 ⁇ 10 ⁇ 5 gfcm 2 /strand for humidity 80%.
  • the difference of the artificial hair 10 of Example 8 from Example 6 was that its sheath/core volume ratio was 1/4, and all others were the same.
  • the rigidity for bending was 730 ⁇ 10 ⁇ 5 gfcm 2 /strand for humidity 40%, about equal to the average value of the natural hair, and decreased as humidity increased in humidity range 40-60%, and 560 ⁇ 10 ⁇ 5 gfcm 2 /strand for humidity 60%. Then it gradually lowered in humidity range 60-80% to 490 ⁇ 10 ⁇ 5 gfcm 2 /strand for humidity 80%.
  • the difference of the artificial hair 10 of Example 9 from Example 6 was that its sheath/core volume ratio was 1/3, and all others were the same.
  • the rigidity for bending was 730 ⁇ 10 ⁇ 5 gfcm 2 /strand for humidity 40%, about equal to the average value of natural hair, and decreased as the humidity increased in humidity range 40-60% to 530 ⁇ 10 ⁇ 5 gfcm 2 /strand for humidity 60%. Then it gradually lowered in humidity range 60-80% to 440 ⁇ 10 ⁇ 5 gfcm 2 /strand for humidity 80%.
  • the difference of the artificial hair 10 of Example 10 from Example 6 was that its sheath/core volume ratio was 1/2, and all others were the same.
  • rigidity for bending was 730 ⁇ 10 ⁇ 5 gfcm 2 /strand for humidity 40%, about equal to the average value of the natural hair, and decreased as the humidity increased in humidity range 40-60% to 490 ⁇ 10 ⁇ 5 gfcm 2 /strand for humidity 60%. Then it gradually lowered in humidity range 60-80% to 380 ⁇ 10 ⁇ 5 gfcm 2 /strand.
  • the artificial hair of Comparative Example 4 was made of nylon MXD6, its thread diameter was 80 ⁇ m, its rigidity for bending was 940 ⁇ 10 ⁇ 5 gfcm 2 /strand for humidity 40%, and decreased in humidity range 40-60% to 870 ⁇ 10 ⁇ 5 gfcm 2 /strand for humidity 60%. It further gradually decreased till humidity range 60-80% to 780 ⁇ 10 ⁇ 5 gfcm 2 /strand for humidity 80%. It turned out that the rigidity for bending of Comparative Example 4 was considerably higher than the natural hair or the artificial hairs of Examples 6-10 over the whole measured humidity range.
  • the artificial hair of Comparative Example 5 was made of nylon MXD6 with 10% nylon 6 blended in, and its thread diameter was 80 ⁇ m. Its rigidity for bending was 870 ⁇ 10 ⁇ 5 gfcm 2 /strand for humidity 40%, and decreased till humidity about 60% to 720 ⁇ 10 ⁇ 5 gfcm 2 /strand for humidity 60%. It further gradually decreased till humidity range 60-80% to 610 ⁇ 10 ⁇ 5 gfcm 2 /strand for humidity 80%. It turned out that the rigidity for bending of Comparative Example 5 was considerably higher than the natural hair or the artificial hairs of Examples 6-10 over the whole measured humidity range.
  • the rigidities for bending of natural hairs tended to have individual deviation, unlike artificially manufactured hairs, and the humidity dependency of their rigidities for bending had broad range.
  • the rigidities for bending of natural hairs by humidity change were in the range of 660 ⁇ 10 ⁇ 5 gfcm 2 /strand as its minimum value and 740 ⁇ 10 ⁇ 5 gfcm 2 /strand as its maximum value for humidity 40%, and the width of this deviation was 80 ⁇ 10 ⁇ 5 gfcm 2 /strand.
  • the minimum value was 520 ⁇ 10 ⁇ 5 gfcm 2 /strand
  • the maximum value was 660 ⁇ 10 ⁇ 5 gfcm 2 /strand
  • the width of deviation was 140 ⁇ 10 ⁇ 5 gfcm 2 /strand which was wider than for humidity 40%.
  • the deviation was wider, as wide as with the minimum value 420 ⁇ 10 ⁇ 5 gfcm 2 /strand and the maximum value 600 ⁇ 10 ⁇ 5 gfcm 2 /strand.
  • the artificial hair 10 of Examples 1-10 by making the sheath with nylon 6 or nylon 66, the core with nylon 6T or nylon MXD6, and by varying the sheath/core volume ratio, the artificial hair 10 were obtained which had the rigidity for bending and its humidity dependency similar to natural hair.
  • the rigidity for bending of the artificial hair 10 manufactured using nylon 6T or nylon MXD6 for the core portion 1 B with the sheath/core volume ratio about 1/2 was close to the minimum value of that of the natural hair, and that of the artificial hair 10 manufactured with the sheath/core volume ratio about 1/7 was close to the maximum value of that of the natural hair.
  • the sheath/core weight ratio of the artificial hair 10 manufactured by the sheath/core volume ratio within the range of 1/2-1/7 was in the range of 10/90-35/65.
  • FIGS. 14-16 are figures showing (A) the artificial hair of Example of the present invention, (B) the natural hair, and (C) the conventional artificial hair made of polyester in the initial states of curls, the water-soaked states, and the dried states after water-soaking, respectively. Each hair was bound at its upper portion, and drying was by natural drying.
  • the artificial hairs 1 , 10 of Examples recovered to the initial state of curl, and it is seen that it showed a change close to the natural hair (See FIGS. 16(A) and (B)). Though not shown in figures, in the case of the artificial hairs made of materials other than polyester, it was known that their curls stretch upon wetting with water, for example, and did not recover easily to the original curl even if the moisture was removed under natural standing.
  • the artificial hairs 1 , 10 of the present invention it is seen that, when they were curled, their behavior was close to natural hair in the stretch of curl upon wetting with water, and the recovery of curl when the moisture was removed under natural standing.
  • the rigidity for bending for humidity 40% at 22° C. either coincided with the average value of natural hair 720 ⁇ 10 ⁇ 5 gfcm 2 /strand, or showed a quite close value. It is further seen that the behavior of the rigidity for bending decreased accompanying humidity increase up to humidity 80% was also quite close to natural hair. Still further, it was seen that, for the artificial hair 10 upon actually wetting with water, the stretch of a curl and its recovery when the moisture was removed under natural standing are similar behavior to the natural hair.
  • the artificial hair manufactured in accordance with the present invention had the rigidity for bending for humidity 40% at 22° C. either coinciding with the average value of natural hair 720 ⁇ 10 ⁇ 5 gfcm 2 /strand, or showed a quite close value, and the behavior of the rigidity for bending decreased accompanying the humidity increase was also quite close to the natural hair.
  • the wig 40 manufactured using the artificial hair 1 or 10 of the present invention has feelings, such as appearance, tactile and texture, similar to natural hair, and these characteristics change like natural hair under high humidity, or when wet with water, it can be worn with natural feeling.

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WO2017019322A1 (en) * 2015-07-29 2017-02-02 E I Du Pont De Nemours And Company Yarn from polymers having different decomposition temperatures and process for forming same
US10385209B2 (en) 2014-12-09 2019-08-20 Denka Company Limited Polyamide-based fiber for artificial hair having exceptional dripping resistance upon combustion
CN113438907A (zh) * 2019-02-15 2021-09-24 株式会社钟化 人工毛发用芯鞘复合纤维、包含其的头饰制品及其制造方法
CN115506047A (zh) * 2022-08-19 2022-12-23 邵阳深镁科技时尚有限公司 一种高强度假发及其制备方法

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CN102368919A (zh) * 2009-02-04 2012-03-07 爱德兰丝株式会社 假发
WO2014033935A1 (ja) * 2012-08-31 2014-03-06 富士ケミカル株式会社 人工毛髪及びそれを用いたかつら
WO2014147459A1 (en) * 2013-03-20 2014-09-25 N.O.M. Coatings Sia Composition of artificial hair and production method thereof
CN110418584B (zh) 2017-03-30 2021-11-23 株式会社钟化 人工毛发用芯鞘复合纤维及包含其的头饰制品
WO2021176830A1 (ja) * 2020-03-03 2021-09-10 株式会社カネカ 人工毛髪用芯鞘複合繊維、それを含む頭飾製品及びその製造方法
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KR102647770B1 (ko) 2023-03-20 2024-03-14 주식회사 케어마일 내구성과 유연성을 향상시킨 그래핀 함유 인조모발 및 그 제조방법

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KR20070094661A (ko) 2007-09-20
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KR100924319B1 (ko) 2009-11-02
CA2597544A1 (en) 2006-08-24
TWI275360B (en) 2007-03-11
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AU2006215203A1 (en) 2006-08-24
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EP1852022A1 (en) 2007-11-07
RU2387350C2 (ru) 2010-04-27
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TW200640385A (en) 2006-12-01

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