JP4823237B2 - Artificial hair, wig having artificial hair, and method for producing artificial hair - Google Patents

Description

  The present invention relates to artificial hair having a texture and physical properties similar to those of hair, that is, natural hair, a wig to which the artificial hair is attached, and a method for producing artificial hair.

  In general, hair, that is, natural hair, has a diameter of about 80 to 100 μm and is curled naturally or by a permanent treatment, etc., but when exposed to rain or wet by washing, the curl collapses and stretches. Have. In addition, it is known that the physical properties of the hair, such as moist feeling and tactile sensation, and the physical properties such as bending rigidity change depending on the humidity level. For this reason, as hair used for wigs, natural hair collected from humans or animals has been manufactured and used for a long time so as to have characteristics as close to human natural hair as possible. However, in recent years, synthetic fibers are often produced as hair materials for wigs due to restrictions on procurement of natural hair materials and other reasons. For example, polyacrylic, polyester, and polyamide synthetic fibers are used as artificial hair materials. It is often used as.

  Artificial hair made of polyacrylic fiber has a low melting point and poor heat resistance, so it has poor shape retention after perm setting. For example, when exposed to warm water, it suffers from weakness such as curling applied to the fiber. is there. Also, the texture such as moist and tactile sensation is different from the hair, and the waist is weak.

  In contrast, polyester fiber is a material with excellent strength and heat resistance, but its hygroscopicity is extremely low compared to natural hair. For example, it exhibits a different appearance, feel, and physical properties from natural hair in a high humidity environment. When used as hair for wigs, it gives an uncomfortable feeling. When natural hair gets wet in the rain or is washed and exposed to moisture, the curl collapses and stretches. However, polyester fiber has a characteristic that it has very little hygroscopicity and moisturizing power, and therefore has excellent curl retention, and this elongation hardly occurs. Therefore, after making artificial hair with polyester fiber and once curling treatment, the applied curl is difficult to collapse even if the humidity is high, which is significantly different from the behavior of natural hair and unnatural feeling becomes remarkable. . As described above, the polyester fiber cannot exhibit a behavior like natural hair in which a texture such as moist feeling or touch and a physical property value such as a curl holding power change with increasing or decreasing humidity.

  In addition, polyester fibers having a diameter of about 80 to 100 μm, which is the same as natural hair, have a bending stiffness value that is too high compared to natural hair. The bending stiffness value is a physical property value related to the texture such as the tactile feel and texture of the fiber. It is a force necessary for bending, but it is a physical property value widely recognized in the textile industry as being quantifiable by the Kawabata method. (Non-Patent Document 1). An apparatus capable of measuring the bending stiffness value of a single fiber or hair has also been developed (Non-Patent Document 2). This bending stiffness value is also referred to as bending stiffness, and is defined by the reciprocal of the curvature change caused by applying a unit-sized bending moment to artificial hair. As the bending stiffness value of the artificial hair is larger, the artificial hair is more resistant to bending and more difficult to bend, that is, it is hard and hard to bend. Conversely, it can be said that the smaller the bending stiffness value, the easier it is to bend and the softer artificial hair.

  When artificial hair is made of polyester having a diameter of about 80 to 100 μm, which is the same as that of natural hair, the bending rigidity value thereof is very high compared to natural hair. In addition, the feel of polyester hair is harder and harder than natural hair, and it cannot express moderate flexibility like natural hair. Therefore, when polyester hair is used as so-called self-hair-utilizing wig hair that is mixed and worn with the hair of the hair and the wig, the hair of the polyester fiber is not compatible with the soft hair. In addition, it rises like a fluff from between the sleeping own hair. Such a tendency of separation between the own hair and the polyester hair becomes more prominent as the humidity increases.

  In contrast, artificial hair made of polyamide fibers has an appearance and physical properties close to those of natural hair compared to artificial hair made of polyacrylic or polyester, and has an unnatural luster due to surface treatment. An excellent wig is provided by the invention of the present applicant that eliminates (see Patent Document 1). Among the polyamide fibers, aliphatic polyamides are particularly suitable for artificial hair because of their excellent processability. However, since the fiber made of aliphatic polyamide has a lower bending rigidity value than natural hair, even if it is implanted in a wig base, the rise is inferior, and it lies sideways along the wig base. For this reason, artificial hair made of aliphatic polyamide tends to have a low back and a poor volume. As a result of earnest research, the present applicant has made a sheath-core dual structure of an aliphatic polyamide resin and an aromatic polyamide resin, and thus has an artificial behavior that is very similar to natural hair that changes with changes in humidity. Succeeded in making hair (Japanese Patent Application No. 2005-38415 dated February 15, 2005). With this technique, it is possible to achieve a bending stiffness value similar to that of natural hair in polyamide fiber hair.

  As another technique for artificial hair, to make it possible to use a hair dryer or curling iron, artificial hair made of polyester fiber and artificial hair made of nylon fiber are bundled and mixed to create an artificial hair bundle And pulling out several pieces from this artificial hair bundle and planting them in wigs (Patent Document 2), or mixing natural hair with artificial hair made of polyester fiber to ensure moisturizing properties and the overall color of the wig In addition, a technique for bringing luster closer to natural hair (Patent Document 3) has also been proposed.

  Patent Document 4 discloses a bristle material for a brush such as a toothbrush or a makeup brush that has an appropriate fluff by mixing polyethylene terephthalate with polybutylene terephthalate and melt spinning. Patent Document 5 discloses a short film made of a polymer blended with polyethylene terephthalate and polybutylene terephthalate in order to obtain a soft feel as a vehicle interior material such as a car seat skin material and a door interior material of a transportation vehicle. A fiber is disclosed. Patent Document 6 discloses a false twisted yarn obtained by blending polyethylene terephthalate with polybutylene terephthalate in order to provide a soft and excellent stretch fabric. Patent Document 7 discloses a nonwoven fabric made of a polymer obtained by mixing polyethylene terephthalate and polybutylene terephthalate at a predetermined mass ratio.

Japanese Patent Application Laid-Open No. 64-6114 JP-A-9-324314 Utility Model Registration No. 3021160 JP 2004-166966 A JP 2004-84119 A JP 2000-273727 A Japanese Patent No. 3458924 Katsuo Kawabata, Journal of the Textile Machinery Society (Textile Engineering), 26, 10, pp. 721-728, 1973 Kato Tech, KES-SH Single Hair Bending Tester Instruction Manual

  As described above, artificial hair used in wigs has been devised in various ways so as to be as close as possible to the texture (appearance, feel, texture) of natural hair. In addition, physical property values such as hygroscopicity, tensile strength, elastic modulus, or bending rigidity are preferably required to be superior to those of natural hair so as not to be inferior to those of natural hair. The artificial hair composed of the above-mentioned polyamide fiber sheath core structure of the present applicant has a diameter of about 80 to 100 μm, which is the same as that of natural hair, and is very excellent because it can create a texture very close to natural hair. Material. However, when artificial hair made of polyamide fiber is attached to the wig base, when time passes, the artificial hair has a characteristic that the artificial hairs stick to each other and converge. Therefore, it is necessary to brush the focused hair by carefully brushing each time. Further, since the artificial hair made of polyamide fiber has hygroscopicity like natural hair, when the humidity is high, the fibers tend to stick to each other due to their characteristics. This tendency becomes more prominent as the humidity increases. For this reason, if the polyamide-based artificial hair is focused by, for example, being wet in the rain or scouring the hair to absorb the humidity, the wig wearer will be able to comb the hair with a comb or brush to adjust the hair style. There is a problem that it is difficult for individual hairs to be separated and it takes time to obtain a desired hairstyle. This characteristic is the same as in the case of artificial hair having a sheath-core double structure composed of the above-mentioned aliphatic and aromatic polyamide resin, and it is difficult to suppress the converging property of the artificial hair of the polyamide-based fiber. It is difficult to prevent artificial hairs from coming into close contact with each other, and converging into a bundle or streak as the height increases.

  When the polyester fiber hair and the nylon fiber hair described in Patent Document 2 are mixed and attached to the wig base, the convergence of the nylon fibers can be prevented, but the nylon fibers are natural. In the same manner as hair, it lies down on the wig base, whereas polyester artificial hair stands up and does not mix well with natural hair or nylon fibers, giving it a separated appearance. This tendency becomes more pronounced as the humidity increases. Nylon fibers sleep while sticking to the scalp in the same way as natural hair due to moisture absorption, but polyester fibers have high bending rigidity and moisture absorption. Since it is inferior in nature, it is in a state of standing up, so that the natural feeling does not appear and the wig wearing is easily recognized.

  In view of the above problems, the present invention has a texture and physical properties that approximate natural hair, in particular, a portion of artificial hair implanted in a wig base does not stand up unnaturally, has excellent hairstyle retention, and is the same as human hair The curling characteristics of the artificial hair can appear, and even if the artificial hairs are affected by humidity, they give a feeling of smoothness without converging, and have bending rigidity similar to that of natural hair. It is an object of the present invention to provide artificial hair capable of exhibiting behavior, a wig using the same, and a method for producing artificial hair.

  As a result of intensive research, the inventors of the present invention have made it easy to focus the polyamide artificial hair due to the molecular structure of the polyamide artificial hair, the molecular binding force on the surfaces of the polyamide artificial hair, It was assumed that it was due to the so-called van der Waals force, and various experiments were conducted, and it was mixed with other synthetic fibers, specifically artificial hair containing polyethylene terephthalate, and attached to the wig base. In this way, we learned that the focused state can be eliminated. Furthermore, in order to make the polyamide-based artificial hair have a bending rigidity value similar to that of natural hair, it is possible to obtain very excellent characteristics by adjusting the sheath-core ratio and the like by making the fiber a double structure of sheath and core. In the case of polyethylene terephthalate-based artificial hair, the inventors have obtained the knowledge that the diameter can be controlled or obtained by melt spinning with another synthetic resin, and the present invention has been completed.

In order to achieve the above object, the artificial hair of the present invention is made of a fiber containing polyethylene terephthalate and has a bending rigidity value comparable to that of natural hair. Specifically, the artificial hair is made of a fiber containing polyethylene terephthalate, and has a cross-sectional dimension comparable to that of natural hair, for example, a cross-sectional dimension perpendicular to the longitudinal direction of the fiber is in the range of 50 to 70 μm in average diameter. Thus, it has a bending rigidity value similar to that of natural hair.
The artificial hair is preferably made of fibers containing polyethylene terephthalate and polybutylene terephthalate, and has a bending rigidity value similar to that of natural hair. In this case, it is preferable that the cross-sectional dimension perpendicular to the longitudinal direction of the fiber is in the range of 50 to 100 μm in average diameter.
In each of the above configurations, the bending stiffness value of the fiber is preferably in the range of 6.5 to 7.8 × 10 ⁻³ gf · cm ² / piece at a humidity of 40%. Micropores are preferably formed in the longitudinal direction on the surface of the fiber.

  According to the said structure, the artificial hair which has a bending rigidity value comparable as natural hair can be provided by making the cross-sectional dimension of the fiber which consists of polyethylene terephthalate into the same grade as natural hair. In addition, since the bending stiffness is naturally adjusted by polyethylene terephthalate with high bending stiffness and polybutylene terephthalate with low bending stiffness, the bending stiffness can be set to the same level as natural hair. Artificial hair having characteristics can be provided. Since these artificial hairs have a flexural rigidity value close to that of natural hair, it is possible to provide natural artificial hair that is very close to natural hair in terms of appearance, touch and texture. The rise of the artificial hair from the wig base exhibits the same behavior as the rise of the natural hair from the scalp, so that it is difficult to visually recognize that the wig is worn with a natural feeling. When fine pores are formed in the longitudinal direction on the surface of the artificial hair, the irradiated light is irregularly reflected, so that the gloss is suppressed and a gloss equivalent to that of natural hair can be exhibited.

The artificial hair bundle of the present invention is obtained by dispersing the first artificial hair made of a polyester resin into the second artificial hair made of a polyamide resin and mixing them at a predetermined ratio, and the polyester resin is made of polyethylene terephthalate. And the first artificial hair has a cross-sectional dimension and bending rigidity value comparable to those of natural hair.
In the first artificial hair, the polyester resin preferably includes polyethylene terephthalate and polybutylene terephthalate, and has a bending rigidity value comparable to that of natural hair. The cross-sectional dimension perpendicular to the longitudinal direction of the first artificial hair is in the range of 50 to 70 μm in average diameter. The second artificial hair preferably has a sheath / core structure composed of a core part and a sheath part covering the core part, the core part is made of polyamide resin, and the sheath part has a bending rigidity higher than that of the core part. Made of a low polyamide resin. The second artificial hair preferably has the same cross-sectional dimension and bending rigidity value as natural hair, and in the range of 6.5 to 7.8 × 10 ⁻³ gf · cm ² / bars at a humidity of 40%. is there.

  By appropriately mixing the first artificial hair made of polyester resin with the second artificial hair made of polyamide resin, and then implanting it in the wig base in a properly dispersed state, the second artificial hair The convergence property of itself can be suppressed. In addition, since the first artificial hair is made of polyethylene terephthalate and polybutylene terephthalate, it has a bending rigidity value comparable to that of natural hair compared to the case of using only polyethylene terephthalate, so that the appearance, touch, It is possible to provide natural artificial hair whose texture such as texture is very close to natural hair.

The wig according to the first configuration of the present invention includes a wig base and artificial hair implanted in the wig base, and as the artificial hair, the first artificial hair made of polyester resin and the second made of polyamide resin Using artificial hair, the polyester resin contains polyethylene terephthalate, and the first artificial hair has a cross-sectional dimension comparable to that of natural hair, thereby having a bending rigidity value comparable to that of natural hair.
The wig according to the second configuration of the present invention includes a wig base and artificial hair implanted in the wig base, and the artificial hair includes a first artificial hair made of polyester resin and a second made of polyamide resin. Artificial hair is used, the polyester resin contains polyethylene terephthalate and polybutylene terephthalate, and the first artificial hair has a bending rigidity value similar to that of natural hair. The second artificial hair preferably has a sheath / core structure comprising a core part and a sheath part covering the core part, the core part is made of a polyamide resin, and the sheath part has a lower bending rigidity than the core part. Made of resin.

  By using the artificial hair having the above-described configuration in the wig of the present invention, it is possible to provide a wig that exhibits a natural smooth feeling and exhibits a behavior close to that of natural hair. For this reason, since the first artificial hair made of polyester resin is appropriately mixed with the second artificial hair made of polyamide fiber and planted, the convergence property of the second artificial hair is suppressed, and the humidity is somewhat increased. Regardless of the hair style set, the wig wearer is not exposed to wearing the wig due to the appearance as if the wrinkle is self-grown naturally from the head.

  The first structure related to the method for producing artificial hair is to add a coloring raw material to polyethylene terephthalate as a raw material and melt in order to obtain artificial hair having a cross-sectional dimension and bending rigidity value comparable to natural hair. And a second step of solidifying the discharged filamentary melt, and a third step of extending the solidified filamentary member to a predetermined diameter. In the second configuration, in order to obtain artificial hair having a bending rigidity value similar to that of natural hair, polyethylene terephthalate and polybutylene terephthalate as raw materials and a coloring raw material are melted and discharged at a predetermined mass ratio. 1 step, a second step of solidifying the discharged filamentary melt, and a third step of extending the solidified filamentary member to a predetermined diameter. In the first and second configurations, micropores may be formed on the surface of the artificial hair by performing an alkali weight loss treatment in either the second step or the third step.

  With the above configuration, artificial hair having the same characteristics as natural hair can be provided even with a polyester resin, and further, the binding property of the artificial hair of the polyamide resin is suppressed by mixing with the artificial hair made of the polyamide resin. Artificial hair can be provided.

  According to the present invention, artificial hair made of polyester resin having a texture (appearance, tactile sensation, texture) and physical properties, in particular, a bending rigidity value close to that of natural hair can be provided. Since this artificial hair suppresses the converging property of the polyamide resin artificial hair, the polyamide resin artificial hair converges by using a suitable number of hairs in the wig in which the polyamide resin artificial hair is implanted. It is not bundled and can be separated one by one. Therefore, this artificial hair can behave like natural hair with the polyamide resin artificial hair in a smooth state. Therefore, according to the wig of the present invention, since the hair implanted in the wig base exhibits the same behavior as the wig wearer's own hair, the wig wearing is hardly exposed and an excellent appearance can be exhibited.

  Since conventional polyester resin artificial hair has a higher bending stiffness value than natural hair, the rise from the wig base is large, and the polyamide resin artificial hair implanted in the same wig base has a lower bending stiffness value. Together, the artificial hair of polyester resin stands up and stands out, the wig wearing is easy to see, and the unity as a hairstyle is not taken. Conversely, if the polyester resin artificial hair implanted in the wig base has a bending stiffness value lower than that of natural hair, it will be in a state of sleeping along the wig base. The rising of the artificial hair is conspicuous, and the rising hair and the sleeping hair are mixed. As a result, wearing the wig is easy to visually recognize, and uniformity as a hairstyle cannot be obtained. On the other hand, the artificial hair of the polyester resin according to the present invention has a bending rigidity value similar to that of natural hair, and as a result, rises to the same extent as the artificial hair of polyamide resin implanted in the wig base. It is hard to see wearing.

It is a figure which shows one form of the artificial hair of this invention. It is longitudinal direction sectional drawing which shows the other form of the artificial hair of this invention. It is the figure which showed typically the artificial hair bundle of this invention. FIG. 3 schematically shows a preferred configuration of the second artificial hair shown in FIG. 3, (A) is a perspective view, and (B) is a vertical sectional view in the longitudinal direction of the second artificial hair. It is sectional drawing of the longitudinal direction which shows the modification of 2nd artificial hair typically. It is a perspective view which shows typically the structure of the wig of this invention. (A) is the figure which showed the wig of this invention typically, and (B) is the figure which each showed the wig as a comparative example. It is the schematic of a series of apparatuses used for manufacture of the artificial hair of this invention. It is a figure which shows an alkali weight loss part typically. It is the schematic of the manufacturing apparatus used for manufacture of the 2nd artificial hair which comprises the artificial hair bundle | flux of this invention. It is a schematic sectional drawing of the discharge part used for the manufacturing apparatus of FIG. FIG. 3 is a view showing a scanning electron microscope image of artificial hair produced in Example 1. It is a figure which shows the relationship of the bending rigidity value with respect to the cross-sectional diameter of artificial hair regarding the artificial hair manufactured in Example 1 thru | or 5 and Comparative Examples 1-3. It is a figure which shows the bending rigidity value with respect to the mixing ratio regarding the mass of a polybutylene terephthalate. It is a figure which shows the bending rigidity value before and behind an alkali weight loss process in case the mixing ratio of polybutylene terephthalate is 20% and 60%. It is a figure which shows the thermal contraction rate with respect to the bending rigidity value of each artificial hair.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1, 2: 1st artificial hair 2a: Micropore 5, 6: 2nd artificial hair 5A: Sheath part 5B: Core part 5C: Uneven part 10: Artificial hair bundle 20: Wig 21: Wig base 30, 50: Manufacturing apparatus 31, 51, 52: Raw material tank 31A, 51A, 52A: Melt 32, 51D, 52D: Melt extruder 32A, 53C: Discharge port 33, 54: Hot bath 34, 36, 38, 40, 55, 57 , 59, 62: Stretching rollers 35, 37, 39, 56, 58, 60: Dry heat tank 41, 64: Winder 45: Alkali weight reduction part 46: Liquid storage part 47: Rotating cylinder part 47a: Injection port 48: Shower part 51B, 52B: Gear pump 53: Discharge part 53A: Outer ring part 53B: Center circle part 61: Oiling device for antistatic 63: Blasting machine 100: Fiber

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
First, the artificial hair of the present invention will be described. The artificial hair of the present invention is made of polyester-based synthetic fiber or polyethylene terephthalate and has a bending rigidity value similar to that of natural hair. Polyethylene terephthalate is a polymer substantially obtained by condensation polymerization of terephthalic acid and ethylene glycol. Further, the bending rigidity value comparable to that of natural hair is optimally 6.5 to 7.8 × 10 ⁻³ gf · cm ² /40% at a humidity of 40%, and 3% at a humidity of 80%. 9 to 5.8 × 10 ⁻³ gf · cm ² / book. When polyester fiber artificial hair is dispersed in polyamide fiber artificial hair and planted on a wig base at a predetermined ratio, the polyester fiber artificial hair is restrained from converging. Since it has the same bending rigidity value as that of polyamide fiber artificial hair and natural hair, natural hair grown from the head of the wig wearer and polyamide artificial hair implanted in the wig base For example, the artificial hair of polyamide system attached to the wig base and the natural hair grown from the scalp of the wig wearer have the same appearance and a uniform appearance.

Hereinafter, each embodiment of the artificial hair according to the present invention will be described.
The first form of the artificial hair according to the present invention is a fiber comprising polyethylene terephthalate as a component and optionally containing a color pigment, and the fiber has a cross-sectional dimension comparable to that of natural hair, and is natural. It has a bending rigidity value similar to that of hair.
FIG. 1 is a view showing an embodiment of artificial hair containing the polyethylene terephthalate of the present invention as a component. As shown in FIG. 1, the artificial hair 1 may have a perfect circle, a flat oval shape in any direction, or an eyebrows shape. The cross-sectional dimension of the artificial hair 1 according to the first embodiment of the present invention is such that the average diameter is 50 to 70 μm. If the average diameter of the cross section of the artificial hair 1 is less than 50 μm, the bending stiffness value is lower than that of natural hair, and when placed on the wig base, it becomes a state of sleeping along the wig base. On the other hand, if the average diameter exceeds 70 μm, the bending stiffness value is too higher than that of natural hair, and when the wig base is implanted, the rise from the wig base is not preferable.

  The second form of the artificial hair according to the present invention is made of a polyester-based synthetic fiber, and includes polyethylene terephthalate and polybutylene terephthalate as a component of the polyester-based synthetic fiber in a predetermined ratio, so that it is the same as natural hair. It has a degree of bending rigidity. Polybutylene terephthalate is substantially a polymer obtained by polycondensation of terephthalic acid and 1,4-butanediol. As in FIG. 1, the artificial hair of the second form may have a perfect circle or a flat oval or eyebrow shape in any direction. The cross-sectional dimension is preferably 50 to 100 μm. This artificial hair is advantageous because it can have the same diameter of 80 to 100 μm as natural hair.

Next, the 3rd form of artificial hair is demonstrated.
FIG. 2 is a longitudinal sectional view showing the artificial hair 2 according to the third embodiment of the present invention. Unlike FIG. 1, fine uneven portions 2 a are formed on the surface of the artificial hair 2. Since artificial hair 2 having such uneven portions 2a on its surface causes irregular reflection, gloss is hardly generated on the surface of artificial hair 2, and a so-called matte effect can appear. The concavo-convex portion 2a is preferably formed larger than the order of visible light wavelength so that light is irregularly reflected. This uneven | corrugated | grooved part 2a can be formed, for example after spinning artificial hair, immersing in a sodium hydroxide solution etc., carrying out alkali weight reduction processing, washing with water, and drying. The uneven part 2a may be formed by blasting. The component of the artificial hair 2 may be made of polyethylene terephthalate as in the first form, or polyethylene terephthalate and polybutylene terephthalate may be mixed at a predetermined ratio as in the second form. The artificial hair in each of the above forms may contain a pigment that performs predetermined coloring as a component.

  In general, a fiber made of polyethylene terephthalate has a high bending rigidity and is inappropriate as a material for artificial hair. However, the artificial hairs 1 and 2 of the present invention are slightly thinner than natural hair or have the same cross-sectional dimension. By having it, the bending rigidity value is close to that of natural hair, and the same appearance, feel and texture as natural hair can be obtained. In addition, by using a fiber made of polyethylene terephthalate and polybutylene terephthalate, it has a diameter almost the same as that of natural hair and a bending rigidity value close to that of natural hair, and has the same appearance, feel and texture as natural hair. Obtainable. By attaching the artificial hair of the first to third forms (hereinafter referred to as “first artificial hair”) and the second artificial hair made of polyamide fiber to the wig base, Since each of the 1st and 2nd artificial hairs is scattered and further increases, the convergence of the 2nd artificial hair can be suppressed. When trimming to the desired hairstyle, it can prevent unnaturalness due to bundling and give the wig a natural appearance.

Hereinafter, the artificial hair bundle 10 of the present invention will be described.
FIG. 3 is a diagram schematically showing the artificial hair bundle 10 of the present invention. As shown in FIG. 3, the artificial hair bundle 10 is prepared by dispersing a predetermined number of first artificial hairs 1 made of polyester synthetic fibers into a plurality of second artificial hairs 5 made of polyamide synthetic fibers. The first and second artificial hairs are randomly attached to the wig base while being appropriately dispersed. The polyamide-based synthetic fiber as the second artificial hair 5 has the same cross-sectional dimension and bending rigidity value as natural hair.

  In the artificial hair bundle 10, it is preferable that the thermal contraction rate of the second artificial hair 5 is equal to or less than that of the first artificial hair 1. Thereby, even if the curling treatment by heat is applied to the artificial hair bundle 10, the first artificial hair 1 and the second artificial hair 5 are contracted to the same extent, thereby preventing the occurrence of wavy steps. it can. The cause of the occurrence of the wavy step is as follows. When the thermal contraction rate of the second artificial hair 5 is higher than that of the first artificial hair 1, if the artificial hair bundle 10 is subjected to the curling process by heat, the second artificial hair 5 is adjacent to the second artificial hair 5. The first artificial hair 1 that is present tends to contract in the same manner as the second artificial hair 5. However, since the contraction of the second artificial hair 5 is larger than the contraction of the first artificial hair 1, the first artificial hair 1 having a small contraction is pulled, causing kinking and sagging, and giving a predetermined clean curl. Will not be possible, and this will appear as a wavy step.

  4A and 4B are diagrams schematically illustrating a preferred configuration of the second artificial hair 5 shown in FIG. 3, where FIG. 4A is a perspective view, and FIG. 4B is a vertical cross section in the longitudinal direction of the second artificial hair 5. FIG. As shown in the drawing, the second artificial hair 5 has a sheath / core structure having a sheath portion 5A on the surface and a core portion 5B inside the sheath portion 5A, both of which are made of polyamide resin. In the illustrated case, the sheath / core structure is illustrated as being substantially concentrically arranged, but the core portion 5B and the sheath portion 5A may have an irregular shape other than the substantially concentric shape, and the cross section of the second artificial hair 5 The shape may be a circle, ellipse, eyebrows or the like.

As the polyamide resin used as the material of the core portion 5B, a semi-aromatic polyamide resin having high strength and rigidity is suitable. For example, the polyamide resin is composed of an alternating copolymer of hexamethylenediamine and terephthalic acid represented by Chemical Formula 1. Examples thereof include a polymer (for example, nylon 6T) or a polymer (for example, nylon MXD6) in which adipic acid and metaxylylenediamine represented by Chemical Formula 2 are alternately bonded by amide bonds. The polymer material represented by Chemical Formula 2 is advantageous in that hair set is easy to perform compared to the polymer material represented by Chemical Formula 1. “Nylon” is a registered trademark of DuPont. However, in the examples of the present invention, “nylon” is used as the polyamide resin, and therefore this term is used in the following description.

As the polyamide resin used as the material of the sheath portion 5A, for example, a linear saturated aliphatic polyamide having a lower bending rigidity than the material of the core portion 5B is suitable. As such a linear saturated aliphatic polyamide, a polymer comprising a ring-opening polymer of caprolactam represented by Chemical Formula 3, for example, nylon 6, or an alternating copolymer of hexamethylenediamine and adipic acid represented by Chemical Formula 4 For example, nylon 66, and the like.

  When the surface of the sheath portion 5A of the second artificial hair 5 is smooth, an unnatural luster is generated. Therefore, it is preferable to perform a so-called matte treatment in order to suppress this luster. FIG. 5 is a longitudinal sectional view schematically showing the configuration of a modification of the second artificial hair 6. A fine uneven portion 5C is formed on the surface of the sheath portion 5A of the second artificial hair 6 so as to exhibit a matte effect.

  Here, the fine concavo-convex portion 5C can be imparted by blasting with fine powder such as sand, ice, dry ice, etc., during spinning of the second artificial hair 6 or after spinning. When the second artificial hair 6 is formed during spinning, a spherical crystal may be formed on the outermost surface of the second artificial hair 6. A combination of spherulite formation and blasting with fine powder such as sand, ice or dry ice may be used. What is necessary is just to form the uneven | corrugated | grooved part formed by the spherulite formation and / or the blast process so that it may become the uneven | corrugated | grooved part 5C larger than the order of visible light wavelength so that light may be diffusely reflected. The second artificial hairs 5 and 6 can also be colored according to the wearer's preference. In this coloring, pigments and / or dyes may be blended during the kneading of the polymer used as a raw material during spinning, or may be dyed after spinning. Thus, the second artificial hairs 5 and 6 have a sheath / core structure in which a polyamide having a high bending rigidity is used for the core portion 5B and a polyamide having a lower bending rigidity than the core portion 5B is used for the sheath portion 5A. As a result, it is possible to obtain artificial hair that changes in rigidity according to temperature and humidity and exhibits a behavior closer to that of natural hair.

  The mixing ratio of the first artificial hairs 1 and 2 in the artificial hair bundle 10 with the second artificial hairs 5 and 6 is preferably in the range of 10 to 60% by weight, particularly about 20 to 30% by weight. This is because the polyamide fibers do not converge within this preferable range. When the mixing ratio of the first artificial hairs 1 and 2, that is, the polyester fibers is less than 10% by weight, the polyamide fibers are unfavorably focused. On the contrary, when the mixing ratio of the polyester fiber (first artificial hair) exceeds 60% by weight, the polyamide fiber does not converge, but the polyester fiber (first artificial hair) is conspicuously undesirable. This is because the polyester fiber has a poor hygroscopicity as compared with the polyamide fiber, and the artificial hair bundle 10 composed of two kinds of fibers shows different behavior depending on the change of humidity due to the difference in the hygroscopic property.

  As described above, when the polyester artificial hair is mixed with the polyamide artificial hair, it becomes difficult to focus the polyester artificial hair having a different chemical structure on the polyamide artificial hair and the polyamide artificial hair is positive. It is presumed that it is easy to be charged, and that the polyester-based artificial hair is easily negatively charged.

  The artificial hair bundle 10 is formed by mixing the first artificial hairs 1 and 2 and the second artificial hairs 5 and 6 in a preferable weight ratio, so that the second artificial hairs 5 and 6 do not converge, and The first artificial hairs 1 and 2 and the second artificial hairs 5 and 6 can have a bending rigidity value similar to that of natural hair.

Next, the wig of the present invention will be described.
FIG. 6 is a perspective view schematically showing the configuration of the wig 20 of the present invention. The wig 20 using the artificial hairs 1 and 2 according to the present invention is configured such that the first artificial hairs 1 and 2 and the second artificial hairs 5 and 6 are implanted in the wig base 11 at a predetermined ratio. Yes. The first artificial hairs 1 and 2 are made of polyester synthetic fibers as described above, and have a bending rigidity value similar to that of natural hair. The second artificial hairs 5 and 6 are made of polyamide-based synthetic fiber and have the same cross-sectional dimensions and bending rigidity values as natural hair. As described above, the core 5B is preferably a polyamide resin having high rigidity. The sheath portion 5A is made of a polyamide resin whose rigidity is lower than that of the core portion 5B.

  The mixing ratio of the first artificial hairs 1 and 2 and the second artificial hairs 5 and 6 implanted in the wig base 21 is 20 ± 5% by weight of the first artificial hairs 1 and 2 in an arbitrary region. It is preferable that they are mixed to a certain extent. This is because the second artificial hairs 5 and 6 made of polyamide fibers implanted in the wig base 21 do not converge when mixed in this preferred range. When the mixing ratio of the first artificial hair is less than 20 ± 5% by weight, the polyamide-based fibers are undesirably focused. On the contrary, when the mixing ratio of the polyester fiber (first artificial hair) exceeds 20 ± 5% by weight, the polyamide fiber does not converge, but the polyester fiber (first artificial hair) is conspicuously undesirable.

  The wig base 21 can be composed of a net base or an artificial skin base. In the case of illustration, the wig base 21 is comprised with the net member, and the 1st artificial hair 1 and 2 and the 2nd artificial hair 5 and 6 are planted by the vertical and horizontal filament which comprises a net member. The wig base 21 may be configured by combining a net-like base and an artificial skin base, and is not particularly limited as long as it matches the design and application of the wig.

  The first artificial hairs 1 and 2 and the second artificial hairs 5 and 6 preferably have a gloss that is similar to that of natural hair, with a specular gloss on the surface being suppressed. The color of the first and second artificial hairs may be appropriately selected from black, brown, blonde, etc. according to the wearer's wish. If artificial hair of a color that matches the hair around the user's hair removal part is selected, the natural feeling will increase. In the case of fashionable wigs or furs, the artificial hair of the present invention is meshed with a color different from that of the own hair, or the artificial hair is changed in color tone, for example, from the base end to the tip. Gradation may be applied by gradually changing.

  FIG. 7A schematically shows the wig 20 of the present invention, and FIG. 7B schematically shows the wig 25 as a comparative example. As shown in FIG. 7A, in the wig 20 of the present invention, the first artificial hairs 1 and 2 are bent to the same degree as the second artificial hairs 5 and 6 having the same bending rigidity value as that of natural hair. Since it is configured to have a rigidity value, the first artificial hairs 1 and 2 and the second artificial hairs 5 and 6 are similarly implanted in the wig base 21 and cannot be distinguished from each other. Furthermore, the outstanding wig which the polyamide-type fiber which forms the 2nd artificial hair 5 and 6 does not converge can be provided. On the other hand, as shown in FIG. 7 (B), the artificial hair 3 composed only of polyethylene terephthalate having a cross-sectional dimension outside the range of 50 to 70 μm in average diameter together with the second artificial hair 5 and 6 on the wig base 21. In the conventional wig 20 in which the artificial hair 3 is implanted, the artificial hair 3 has a bending rigidity value different from that of the second artificial hair 5 and 6, so that the rising from the wig base 21 is large, and the second artificial hair 5 and 6 Presents a separated appearance and is not preferred.

Next, the manufacturing method of the artificial hair of this invention is demonstrated. Initially, the apparatus system used for the manufacturing method of the artificial hair of this invention is demonstrated.
FIG. 8 is a schematic view of an apparatus system used for manufacturing the artificial hair of the present invention. As shown in FIG. 8, the manufacturing apparatus 30 includes a raw material tank 31 for storing polyethylene terephthalate resin pellets and polyethylene terephthalate resin pellets containing colored raw materials, and a melt extruder for melting and kneading the raw materials. 32, a warm bath 33 for solidifying the filamentary melt that discharges the melt kneaded by the melt extruder 32 from the discharge port 32A, and then each stage includes stretching rollers 34, 36, 38, 40 and a dry heat bath 35, It includes a winder 41 that winds the artificial hair 1 through a three-stage drawing heat treatment step consisting of 37 and 39, and an alkali weight reduction unit (not shown) for further attaching fine holes 2a to the yarn surface. The

  The melt extruder 32 includes a heating device for melting polyethylene terephthalate resin pellets and polyethylene terephthalate resin pellets containing coloring materials, a kneader for dispersing and stirring uniformly. A gear pump for feeding the melt to the discharge port 32A.

  The discharge port 32A of the discharge unit 32 is provided with a predetermined number of holes having a predetermined diameter, and the fibers coming out of the discharge port 32A of the discharge unit 32 are in order, as shown in the figure, the warm bath unit 33 and the first stretching roller 34. After passing through the first dry heat tank 35, the second stretching roller 36, the second dry heat tank 37, the third stretching roller 38, the third dry heat tank 39, and the fourth stretching roller 40, the film is wound around the winder 41. Thereafter, an alkali weight reduction process is performed in an alkali weight reduction unit (not shown). The first stretching roller 34 to the fourth stretching roller 40 perform a stretching process on the solidified thread member. First, the first stretching process is performed on the yarn member by increasing the roller speed of the second stretching roller 36 relative to the roller speed of the first stretching roller 34, and then the roller speed of the third stretching roller 38 is increased. The second stretching process is performed on the yarn member by increasing the roller speed of the second stretching roller 36, and then the roller speed of the fourth stretching roller 40 is decreased with respect to the roller speed of the third stretching roller 38. As a result, relaxation stretching treatment is performed to relax the tension applied to the fibers and stabilize the dimensions. An anti-static oiling device (not shown) may be provided between the fourth stretching roller 40 and the winder 41.

  FIG. 9 is a schematic diagram of the alkali weight reducing unit 45. The alkali weight reduction unit 45 includes a liquid storage unit 46 that stores a treatment liquid containing an alkaline aqueous solution, a rotary cylinder unit 47 that rotates by suspending the fiber 100 so that a part of the fiber 100 is immersed in the liquid storage unit 46, The shower unit 48 is configured to inject the treatment liquid onto the fiber 100 that is disposed above the rotary cylinder unit 47 and is suspended from the rotary cylinder unit 47. The liquid storage unit 46 stores a treatment liquid containing an alkaline aqueous solution for etching polyester fibers and an accelerator for promoting hydrolysis, and immerses a part of the fiber 100 in the treatment liquid. Then, the surface of the fiber 100 is etched. The rotating cylinder portion 47 is configured by extending three pairs of tube portions in the direction of the rotation axis, and arranging each pair of tube portions so as to have a substantially triangular cross-sectional shape. A plurality of injection ports 47a are provided on the side opposite to the direction, so that the processing liquid that has flowed into the pipe portion can be injected outward in the rotation direction.

  In the alkali weight reduction unit 45, the fiber 100 that has been stretched and relaxed is subjected to an etching process. That is, by immersing a part of the fiber 100 in the treatment liquid, the fiber is uniformly etched and the fiber diameter is reduced. 9 rotates in the direction indicated by the thick arrow, the fiber 100 rotates and moves in the direction indicated by the solid line in the drawing. At that time, the treatment liquid sprayed from each of the injection ports 47 a of the rotating cylinder part 47 and the shower part 48 adheres to the outer peripheral surface of the fiber 100 hung on the rotating cylinder part 47. On the right side of the rotating cylinder portion 47, the movement direction of the fiber 100 (the direction of the arrow indicated by the solid line) and the movement direction due to the weight of the treatment liquid (the direction of the arrow indicated by the dotted line) coincide with each other along the fiber movement direction That is, the etching process is performed along the flow of the processing liquid. On the other hand, on the left side of the rotating cylinder portion 47, the direction of movement of the fiber 100 and the direction of the treatment liquid are opposite to each other, so that etching is performed against the direction of movement of the fiber. In this way, the processing liquid adhering to the surface of the fiber 100 flows vertically down the fiber surface along the axial direction of the fiber, that is, the longitudinal direction by the weight of the processing liquid, and the etching process is performed along this flow direction. Applied. Therefore, the fiber 100 is thinned by the alkali reduction treatment, and fine holes are formed in the axial direction on the surface of the fiber.

A method for manufacturing artificial hair by the apparatus system 30 shown in FIG. 8 will be described. First, the manufacturing method of the artificial hair which consists of a polyester-type synthetic fiber which uses polyethylene terephthalate as a component and contains a coloring raw material is demonstrated.
In the manufacturing apparatus 30 shown in FIG. 8, a polyethylene terephthalate pellet and a coloring resin pellet based on polyethylene terephthalate and containing a coloring pigment are mixed and introduced into a raw material tank 31 at a predetermined ratio. By changing the mixing ratio of the resin pellets for coloring, the color of the artificial hair as the final product can be changed. The mixing ratio of the colored resin pellets to the polyethylene terephthalate pellets is 40:60 in terms of the mass ratio of the polyethylene terephthalate pellets: colored resin pellets.

  The pellets in the raw material tank 31 are sent to the melt extruder 32, the pellets are kneaded by the melt extruder 32, the melt 31A is discharged from the discharge port 32A, and the filamentous melt is solidified by the warm bath 33. The temperature of the warm bath 33 is preferably around 40 ° C. in terms of productivity. If the temperature of the warm bath portion 33 is too low, after discharging the molten resin, when the warm bath portion 33 is touched, the inside and outside of the filamentous melt that first contact water are rapidly crystallized due to rapid cooling. As a result, the difference in molecular structure occurs, which causes “waving of yarn”, which is not preferable. If the temperature of the warm bath portion 33 is too high, the crystallization of the thread-like melt progresses too much, so that the durability against the stretching of the thread-like melt is weakened, and yarn breakage tends to occur at the time of stretching, resulting in poor productivity.

  The solidified yarn member is subjected to the first stage stretching process by the first stretching roller 34 and the second stretching roller 36, and the second stage stretching process is performed by the second stretching roller 36 and the third stretching roller 38, A relaxation process is performed by the third stretching roller 38 and the fourth stretching roller 40. By the first and second stretching treatments, the total magnification is set to 6 times as the stretching magnification.

  Next, an alkali weight loss treatment is performed on the fiber that has been subjected to the stretching treatment. Specifically, as shown in FIG. 9, a treatment liquid in which an accelerator for promoting hydrolysis is mixed with an alkaline solution such as an aqueous sodium hydroxide solution is stored in the liquid storage section 46 and hung on the rotary cylinder section 47. A part of the obtained fiber 100 is immersed, and a treatment liquid is sprayed from the spray port of the rotary cylinder part 47 and the shower part 48 to the part of the fiber 100 not soaked. The treatment liquid adhering to the surface of the fiber 100 flows on the surface of the fiber vertically downward along the axial direction of the fiber, that is, the longitudinal direction by the weight of the treatment liquid, and the etching treatment is performed along the flow direction. Therefore, the fiber 100 is thinned by the alkali weight reduction treatment, and fine holes are formed in the axial direction on the surface of the fiber. At this time, the treatment liquid is preferably heated to a predetermined temperature in order to promote hydrolysis. Then, after neutralizing the alkali adhering to the fiber, it can be washed to obtain artificial hair.

Spinning conditions such as the diameter of the hole provided in the discharge port 32A and the temperature of the warm bath 33, the speeds of the first to fourth stretching rollers, the stretching conditions such as the temperatures of the first to third dry heat tanks, and alkali weight loss By adjusting the conditions so that the polyester-based synthetic resin fiber composed of polyethylene terephthalate and color pigments has the same cross-sectional dimensions and bending rigidity values as natural hair, it can be bent as much as natural hair. Artificial hair having a rigidity value can be obtained. For example, by setting the spinning take-up speed to 27.9 m / min and the final take-up speed to 155 m / min, artificial hair having a flexural rigidity value of 6.5 × 10 ⁻³ gf · cm ² / piece after reducing the alkali is reduced. Obtainable.

Next, a method for producing artificial hair containing polyethylene terephthalate and polybutylene terephthalate as components and a color pigment will be described.
In the manufacturing apparatus 30 shown in FIG. 8, a polyethylene terephthalate pellet, a polybutylene terephthalate pellet, and a coloring resin pellet based on polyethylene terephthalate and containing a coloring pigment are mixed in a raw material tank 31 at a predetermined ratio. . The mixing ratio of the colored resin pellets to the total pellets of polyethylene terephthalate and polybutylene terephthalate is 40:60 at a mass ratio of the total pellets of polyethylene terephthalate and polybutylene terephthalate: resin pellets for coloring. The temperature of the warm bath is preferably around 40 ° C.

  Next, similarly to the method for producing artificial hair containing only polyethylene terephthalate and a color pigment, the pellets in the raw material tank 31 are sent to the melt extruder 32, and the melt 31A kneaded by the melt extruder 32 is discharged. It is discharged from the outlet 32A, and the filamentous melt is solidified by the warm bath 33. As in the case described above, the solidified thread member is subjected to a first-stage stretching process, a second-stage stretching process and a relaxation process, and an alkali weight loss process. Then, after neutralizing the alkali adhering to the fiber, it can be washed to obtain artificial hair.

  By adjusting the mixing ratio of the polyethylene terephthalate pellets and the polybutylene terephthalate pellets, artificial hair having a bending rigidity value comparable to that of natural hair can be obtained. The mass ratio of polyethylene terephthalate to polybutylene terephthalate is preferably in the range of 15:85 to 25:75, particularly preferably 20:80. When the mass ratio is less than 15:85, the flexural rigidity value is high. Conversely, when the mass ratio exceeds 25:75, the flexural rigidity value is low. If artificial hair deviating from the above range is used in a wig, the behavior of the artificial hair and the natural hair of the wig wearer differ, which is not preferable. Spinning conditions such as the diameter of the hole provided in the discharge port 32A and the temperature of the hot bath 33, the speeds of the first to fourth stretching rollers, the stretching conditions such as the temperatures of the first to third dry heat tanks, and alkali reduction By adjusting the conditions, artificial hair having an optimum bending rigidity value can be obtained.

The manufacturing method of the 2nd artificial hair 5 and 6 which comprises the artificial hair bundle | flux of this invention is demonstrated.
FIG. 10 is a schematic view of an apparatus 50 used for manufacturing the second artificial hairs 5 and 6, and FIG. 11 is a schematic cross-sectional view of a discharge unit used in the manufacturing apparatus of FIG. As shown in FIG. 10, the manufacturing apparatus 50 includes a first raw material tank 51 for polyamide resin that becomes the sheath part 5A, a second raw material tank 52 for polyamide resin that becomes the core part 5B, and these raw material tanks. Melt extruders 51D and 52D that melt and knead the raw materials supplied from 51 and 52, and a melt that discharges the melts 51A and 52A kneaded by the melt extruders 51D and 52D from the discharge port 53C of the discharge unit 53 Through a three-stage stretching heat treatment process section in which each stage is composed of stretching rollers 55, 57, 59 and dry heat tanks 56, 58, 60. It includes a blasting machine 63 for attaching the uneven portion 5C to the yarn surface, and a winder 64 for winding up the artificial hair that has been matted to a desired degree by the blasting machine 63.

  Melt extruders 51D and 52D include a heating device for melting polyamide resin pellets, a kneader for dispersing and stirring uniformly, and a gear pump for feeding the melts 51A and 52A to the discharge unit 53. 51B and 52B.

  As shown in the drawing, the fibers coming out from the discharge port 53C of the discharge unit 53 are subjected to a warm bath, stretching, and a dry heat mechanism, and then the anti-static oiling device 61 and the tension applied to the artificial hair to stabilize the dimensions are eased. The film is wound on a winder 64 through a stretching roller 62 and a blasting machine 63 for surface treatment.

  As shown in FIG. 11, the discharge part 53 has a double discharge port arranged concentrically, the semi-aromatic polyamide resin melt 52A from the center circle part 53B, and the center circle part. Each of the linear saturated aliphatic polyamide resin melts 51A is discharged from an outer ring portion 53A surrounding 53B.

  Next, the manufacturing method of the 2nd artificial hair 5 and 6 by the said manufacturing apparatus 50 is demonstrated. Using this manufacturing apparatus 50, in each of the melt extruders 51D and 52D, each polyamide resin is melted at a suitable temperature and fed to the discharge unit 53, and the semi-aromatic polyamide resin is fed from the center circle 53B of the discharge port. The artificial hair 5 and 6 can be manufactured by discharging the melt 52A and the linear saturated aliphatic polyamide resin melt 51A from the outer ring portion 53A from the discharge port 53C to form a sheath / core structure yarn.

  Here, the ratio between the capacity of the linear saturated aliphatic polyamide resin melt 51A fed by the gear pump 51B for a certain period of time and the capacity of the semi-aromatic polyamide resin melt 52A fed by the gear pump 52B is defined as the sheath in the present invention. / Called the core capacity ratio. In order to approximate the bending rigidity value of the artificial hair 5 to the bending rigidity value of the natural hair, the sheath / core weight ratio, which is the weight ratio of the sheath to the core, is preferably in the range of 10/90 to 35/65. The manufacturing conditions for obtaining the weight ratio between the sheath and the core are preferably 1/2 to 1/7 as the sheath / core volume ratio, and this range is a physical property value such as the bending rigidity value of the artificial hairs 5 and 6. It is suitable for. When this sheath / core capacity ratio is larger than 1/2, that is, when the ratio of the sheath portion 5A is increased, the effect of contributing to an increase in the bending rigidity value of the core portion 5B of the artificial hair 5, 6 is reduced. When the sheath / core volume ratio is smaller than 1/7, that is, when the ratio of the core portion 5B is increased, the bending rigidity value becomes too large to approximate natural hair.

  The draw ratio during spinning of the artificial hairs 5 and 6 can be 5 to 6 times. This draw ratio is about twice that of conventional nylon 6 artificial hair alone. In the second artificial hairs 5 and 6, the draw ratio, the yarn diameter, the bending rigidity value, etc. at the time of spinning can be appropriately set according to the desired design. The shape of the sheath / core of the artificial hairs 5 and 6 can be made substantially concentric by appropriately controlling the spinning conditions.

  In the spinning for artificial hair, the yarn drawn from the discharge port 53C is passed through water at 80 ° C. or higher in the warm bath portion 54, thereby forming spherulites that will become the irregular portions 5C on the surface of the linear saturated aliphatic polyamide resin of the sheath portion 5A. It is possible to produce matte artificial hair 6 that can be generated and grown, has the same appearance as natural hair, and has an unnatural luster.

  In addition to the above-described generation and growth of spherulites, a method of blasting the spun yarn surface with fine particles such as sand, ice, and dry ice, or a method for imparting fine irregularities 5C to the yarn surface Any of the processing methods or a combination of these may be used.

  In order to give a color and appearance suitable for the artificial hairs 5 and 6, pigments and / or dyes may be blended at the time of spinning, and the artificial hairs 5 and 6 themselves may be dyed after the spinning.

  As described above, since the second artificial hairs 5 and 6 have a sheath / core structure made of polyamide resin having different bending rigidity, bending rigidity is higher than that of conventional artificial hair made of a linear saturated aliphatic polyamide resin alone. High artificial hair 5, 6 can be produced with good reproducibility. If the fine uneven | corrugated | grooved part 5C is formed in the surface of the artificial hair 5, the natural luster approximated to natural hair can be provided and the natural external appearance as hair can be provided.

Next, examples of the present invention will be described in detail.
Artificial hair containing polyethylene terephthalate as a component was produced using a spinning machine 30 shown in FIG. As a raw material for artificial hair, polyethylene terephthalate pellets (manufactured by Toyobo Co., Ltd., density 1.40 g / cm ³ , melting point 255 ° C.) and polyethylene terephthalate resin-based black, yellow, orange, and red pigment weight percentages, 6%, 6%, 5%, and 5% resin pellets for coloring were used, respectively.

  The spinning conditions were such that the melting temperature of the pellet was 270 ° C. as the discharge temperature from the discharge port, and the discharge port was equipped with a die having 15 holes with a diameter of 0.7 mm. The temperature of the warm bath 33 was 40 ° C.

  Regarding the stretching conditions, the speed of each of the first stretching roller 34 to the fourth stretching roller 40 was adjusted so that the cross-sectional average diameter of the artificial hair after the alkali weight reduction treatment was 65 μm. That is, the roller speed of the second stretching roller 36 is 4.6 times the roller speed of the first stretching roller 34, and the roller speed of the third stretching roller 38 is 1. The roller speed of the fourth stretching roller 40 was 0.93 times the roller speed of the third stretching roller 38. Further, the temperature of the first dry heat tank 35 is 130 ° C. as the first stretching temperature, the temperature of the second dry heat tank 37 is 180 ° C. as the second stretching temperature, and the temperature of the third dry heat tank 39 is 180 ° as the relaxation stretching temperature. C.

  The alkali weight reduction treatment was performed by adding a sodium hydroxide aqueous solution having a concentration of 5% by weight as an aqueous alkali solution and adding cationol (manufactured by Takamatsu Yushi Co., Ltd.) as a hydrolysis accelerator to a concentration of 0.5% by weight. Using. The bath ratio was such that the mass ratio of the object to be treated: treatment liquid = 1: 30, the treatment temperature was about 100 ° C., the treatment time was 60 minutes, and the alkali weight loss rate was 10 to 20%.

Table 1 is a table showing physical property values of artificial hair with and without alkali weight loss treatment.

As can be seen from Table 1, the diameter of the artificial hair was reduced from 75.1 μm to 66.1 μm by performing the alkali weight loss treatment. The strength decreased from 84.7 kgf / mm ² to 63.4 kgf / mm ² . The elongation decreased from 19.6% to 12.2%.

  FIG. 12 shows a scanning electron microscope image of the artificial hair produced in Example 1. The acceleration voltage of electrons is 15 kV and the magnification is 800 times. As can be seen from FIG. 12, it can be seen that vertically fine pores are formed on the surface of the artificial hair in a direction perpendicular to the longitudinal direction thereof, that is, in the axial direction of the fiber. A matte effect can be obtained by the fine holes. Moreover, it turned out that the cross-sectional dimension of artificial hair is about 65 micrometers in average diameter.

  Artificial hair having a cross-sectional dimension of an average diameter of 50 μm was produced in the same manner as in Example 1 except that the stretching conditions were changed.

  Artificial hair having a cross-sectional dimension of an average diameter of 55 μm was produced in the same manner as in Example 1 except that the stretching conditions were changed.

  Artificial hair having a cross-sectional dimension of an average diameter of 60 μm was produced in the same manner as in Example 1 except that the stretching conditions were changed.

  Artificial hair having a cross-sectional dimension of an average diameter of 70 μm was produced in the same manner as in Example 1 except that the stretching conditions were changed.

Next, Comparative Examples 1 to 3 with respect to Examples 1 to 5 are shown.
(Comparative Example 1)
Artificial hair having a cross-sectional dimension of an average diameter of 45 μm was produced in the same manner as in Example 1 except that the stretching conditions were changed.

(Comparative Example 2)
Artificial hair having a cross-sectional dimension of an average diameter of 75 μm was produced in the same manner as in Example 1 except that the stretching conditions were changed.

(Comparative Example 3)
Artificial hair having a cross-sectional dimension of an average diameter of 80 μm was produced in the same manner as in Example 1 except that the stretching conditions were changed.

The result of the bending rigidity value of the artificial hair manufactured in Examples 1-5 and Comparative Examples 1-3 is shown. The bending rigidity value was measured in an environment of a temperature of 22 ° C. and a humidity of 40%. The measurement of the bending stiffness of fibers is well known for the Kawabata measurement method and its principle for fabrics, but using a single hair bending tester (model KES-FB2-SH, manufactured by Kato Tech Co., Ltd.), an improved version of this method. The bending stiffness of the artificial hair was measured. The measurement method is as follows. For each of the examples of the present invention as a sample, the artificial hair of the comparative example, and the natural hair, for each one of 1 cm, the entire hair is bent into a circular arc at a constant velocity to a certain curvature, A small bending moment was detected, and the relationship between the bending moment and the curvature was measured. From this, the bending stiffness value was determined from the bending moment / curvature change. Typical measurement conditions are shown below.
(Measurement condition)
Distance between chucks: 1cm
Torque detector: Torsion wire (steel wire) twist detection method Torque sensitivity: 1.0 gf · cm (at 10V full scale)
Curvature: ± 2.5cm ^-1
Bending displacement speed: 0.5cm ^-1 / sec
Measurement cycle: 1 reciprocation Here, the chuck is a mechanism for sandwiching each hair of 1 cm.

Table 2 is a table showing the measurement results of the bending stiffness values of the artificial hair produced in Examples 1 to 5 and Comparative Examples 1 to 3. FIG. 13: is a graph which shows the relationship of the bending rigidity value with respect to the cross-sectional diameter of artificial hair regarding the artificial hair manufactured in Examples 1-5 and Comparative Examples 1-3. The vertical axis in the figure represents the bending stiffness value (gf · cm ² / piece), and the horizontal axis represents the cross-sectional average diameter (μm) of the artificial hair.

As can be seen from Table 2 and FIG. 13, in the artificial hair mainly composed of polyethylene terephthalate, the bending stiffness value increased linearly as the cross-sectional dimension increased. That is, as the average diameter increases to 45 μm, 50 μm, 55 μm, 60 μm, 65 μm, 70 μm, 75 μm, and 80 μm, the flexural rigidity values are 6.37 × 10 ⁻³ gf · cm ² / line and 6.70 ×, respectively. 10 ⁻³ gf · cm ² / line, 6.86 × 10 ⁻³ gf · cm ² / line, 7.12 × 10 ⁻³ gf · cm ² / line, 7.44 × 10 ⁻³ gf · cm ² / line This increased to 7.67 × 10 ⁻³ gf · cm ² / line, 8.06 × 10 ⁻³ gf · cm ² / line, and 8.35 × 10 ⁻³ gf · cm ² / line. Since there are large individual differences in the bending stiffness value of natural hair, hair was collected from 25 males and 38 females in each age group of 20 to 50 years, and the bending stiffness value of a sample with a diameter of 80 μm was measured under the same measurement environment. That is, it was performed in an environment of a temperature of 22 ° C. and a humidity of 40%. The maximum value is 7.4 × 10 ⁻³ gf · cm ² / line, the minimum value is 6.6 × 10 ⁻³ gf · cm ² / line, and the average value is 7.1 × 10 ⁻³ gf · line. cm ² / book. From this result, in the environment of a temperature of 22 ° C. and a humidity of 40%, if it is in the range of about 6.5 to 7.8 × 10 ⁻³ gf · cm ² / bar, it is the same level as natural hair. Based on these results, the artificial hair manufactured in Examples 1 to 5 has a bending rigidity value similar to that of natural hair, but the artificial hair manufactured in Comparative Examples 1 to 3 has a bending rigidity value of natural hair. I found out of range. From the above, it was found that the artificial hair containing polyethylene terephthalate as a component has a bending rigidity value similar to that of natural hair, and may be 50 to 70 μm. The artificial hair produced in Examples 2 to 5 and Comparative Examples 1 to 3 was confirmed by scanning electron microscope images that fine pores were formed as in Example 1.

Polyester artificial hair 2 was manufactured using the manufacturing apparatus 30 shown in FIG. The raw materials for artificial hair are polyethylene terephthalate pellets (Toyobo Co., Ltd., density 1.40 g / cm ³ , melting point 255 ° C.) and polybutylene terephthalate pellets (Mitsubishi Engineering Plastics Co., Ltd., density 1.31 g / cm ³ , melting point 224 ° C.), and based on polyethylene terephthalate resin, black, yellow, orange, and red pigment weight percentages of 6: 6: 5: 5 were used. Seven types of artificial hair were produced by changing the mixing ratio of the polybutylene terephthalate pellets to the total of the polyethylene terephthalate pellets and the polybutylene terephthalate pellets in a mass ratio of 0 to 75%. The spinning conditions, stretching conditions, and alkali weight loss treatment conditions are the same as in Example 1.

Table 3 shows the bending stiffness values of the artificial hair produced in Example 4, and shows the values before and after the alkali weight loss treatment using the polybutylene terephthalate mixing ratio as a parameter. FIG. 14 is a graph of Table 3, showing the bending stiffness value with respect to the mixing ratio with respect to the mass of polybutylene terephthalate. The vertical axis represents the bending stiffness value (gf · cm ² / piece), and the horizontal axis represents the mixing ratio PBT / (PET + PBT) (%) of polybutylene terephthalate with respect to the whole pellet with respect to mass. Among the plots, ◆ indicates the value before the alkali weight reduction treatment, and ■ indicates the value after the alkali weight reduction treatment. The measurement conditions were a temperature of 22 ° C. and a humidity of 40%.

As can be seen from Table 3 and FIG. 14, when the proportion of polybutylene terephthalate was increased for the component of artificial hair, the bending stiffness value decreased both before and after the alkali weight loss. Before the alkali weight loss treatment, the flexural rigidity value was about 1.6 × 10 ⁻² gf · cm ² / piece when the mixing ratio was 20%, but it was about 6.7 when the mixing ratio was increased to 75%. It decreased monotonically to × 10 ⁻³ gf · cm ² / line. After the alkali weight loss treatment, the flexural rigidity value was about 1.2 × 10 ⁻² gf · cm ² / piece when the mixing ratio was 0%, but it was about 8.3 when the mixing ratio was increased to 20%. × decreases monotonically to 10 ^-3 gf · cm ² / present, the mixing ratio was at 60% to about ^{5.7 × 10 -3 gf · cm 2} / present.

  The cross-sectional diameters of seven types of artificial hair having different mixing ratios of polybutylene terephthalate were 81.3 μm on average before the alkali weight reduction treatment, and 71.1 μm on average after the alkali weight reduction treatment.

From the above results, by increasing the mixing ratio of polybutylene terephthalate, it is possible to reduce the flexural rigidity of artificial hair, the same level as natural hair bending stiffness value (6.5 to 7.8 × 10 ^{- 3} gf · cm ² / fiber) can be obtained. For example, it is understood that the mixing ratio of polybutylene terephthalate is about 70 to 80% when alkali reduction treatment is not performed, and the mixing ratio of polybutylene terephthalate is about 20 to 60% when alkali reduction treatment is performed.

FIG. 15 shows bending stiffness values before and after alkali weight loss when the mixing ratio of polybutylene terephthalate is 20% and 60%. The vertical axis represents the bending stiffness value (gf · cm ² / piece), and the horizontal axis represents the mixing ratio of polybutylene terephthalate. As can be seen from FIG. 15, by performing the alkali weight loss treatment, the flexural rigidity value was about 1.6 × 10 ⁻² gf · cm ² / piece at a mixing ratio of 20%, but about 8.3 × 10. ^It decreased to ^-3 gf · cm ² / tube. When the mixing ratio was 60%, it was about 9.8 × 10 ⁻³ gf · cm ² / line, but decreased to about 5.7 × 10 ⁻³ gf · cm ² / line. The cross-sectional diameter of the artificial hair having a polybutylene terephthalate mixing ratio of 20% and 60% was 80.4 μm on average before the alkali weight reduction treatment, and 71.1 μm on average after the alkali weight reduction treatment.

  From the above, in order to reduce the cross-sectional diameter of artificial hair and to reduce the bending rigidity value comparable to that of natural hair, the alkali weight reduction treatment is effective in the production of artificial hair made of polyester synthetic resin. I understood.

In the same manner as in Example 1, an alkali weight loss treatment was performed, and heat treatment was performed on artificial hair made of polyester fibers having a flexural rigidity value of about 6.5 × 10 ⁻³ gf · cm ² / piece and a diameter of about 66 μm. . This heat treatment was a simulation experiment for curling treatment, and was performed by maintaining artificial hair wound around a pipe with a diameter of 30 mm in an environment of 180 ° C. for 2 hours. The shrinkage of the artificial hair after the heat treatment was measured and found to be 0.77%.

Similar to Example 1, unlike Example 7, artificial hair made of polyester fiber having a bending rigidity value of about 1.2 × 10 ⁻² gf · cm ² / line and a diameter of about 75 μm without performing alkali weight loss treatment. In contrast, the same heat treatment as in Example 7 was performed. The shrinkage of the heat-treated artificial hair was measured and found to be 1.55%.

  When Examples 7 and 8 were compared, it was found that the heat shrinkage rate due to the heat treatment was halved by performing the alkali weight loss treatment.

  Next, the effect of the presence or absence of pretreatment on the second artificial hair was confirmed as a pseudo experiment in which the second artificial hair of the artificial hair bundle was preheated and mixed with the first artificial hair to perform the curling treatment. .

A first heat treatment was performed on the artificial hair having a sheath / core structure and a bending rigidity value of 3.9 to 7.8 × 10 ⁻³ gf · cm ² / piece, and then a second heat treatment was performed. The core of the artificial hair is formed of nylon MXD6 (product name: MX nylon manufactured by Mitsubishi Gas Chemical Company) as a polyamide resin, and the sheath includes a copolymer of nylon 6 and nylon 66 (NY6 / 66) and a coloring material. It is made of nylon 6 (NY6). The first heat treatment corresponds to the pretreatment, and was maintained for 30 minutes in an environment of 160 ° C. with the artificial hair stretched without being wrapped around a pipe. The second heat treatment is a curling treatment corresponding to this treatment. Like the heat treatment in Examples 3 and 4, artificial hair was wound around a pipe having a diameter of 30 mm and maintained in an environment of 180 ° C. for 2 hours.

(Comparative Example 4)
The comparative example 4 with respect to Example 9 is shown. In Comparative Example 4, the second heat treatment was performed on the artificial hair similar to that in Example 9 without performing the first heat treatment.

The results of Example 9 and Comparative Example 4 will be described. Table 4 is a table showing the results of Example 9 and Comparative Example 4, shows the thermal shrinkage rate of each artificial hair, the value after the first heat treatment as a result of Example 9, and the first and second values. And the value after only the second heat treatment as a result of Comparative Example 4 is shown. FIG. 16 is a graph of Table 4 and shows the heat shrinkage ratio with respect to the bending rigidity value of each artificial hair. The vertical axis represents the heat shrinkage rate (%), and the horizontal axis represents the bending stiffness value (gf · cm ² / line). The plot ◆ shows the bending stiffness value after the first heat treatment, the plot ■ shows the bending stiffness value after the first and second heat treatments, and the plot ▲ shows the second heat treatment as a result of Comparative Example 4. The bending rigidity value after performing only is shown.

As is apparent from Table 4 and FIG. 16, the artificial hair is thermally shrunk regardless of whether the first heat treatment is performed, only the second heat treatment is performed, or both heat treatments are performed. As a result of Example 9, that is, as the bending stiffness value is larger, the thermal shrinkage rate by the first heat treatment is larger, and the bending stiffness value is about 3.9 × 10 ⁻³ gf · cm ² / about 3% for artificial hair. However, in the case of artificial hair having a flexural rigidity value of about 7.8 × 10 ⁻³ gf · cm ² / piece, it was about 4.6%. Moreover, the thermal contraction rate after the first and second heat treatments was less than 1% regardless of the value of the bending rigidity value, and was in the range of 0.53 to 0.08%. On the other hand, as a result of Comparative Example 4, that is, when only the second heat treatment was performed, the thermal contraction rate was about 1 to 1.4%, not depending on the bending rigidity value.

  Example 7 is compared with Example 9 and Comparative Example 4. According to the result of Example 7, the thermal contraction rate of the polyester-based artificial hair as the first artificial hair is 0.77%, and according to the result of Comparative Example 4, the polyamide-based artificial hair as the second artificial hair Since the heat shrinkage rate of the hair is 1% or more, the second artificial hair shrinks more greatly than the first artificial hair. Therefore, when the polyester-type artificial hair used in Example 7 and the polyamide-type artificial hair used in Comparative Example 4 are mixed and this treatment is performed, the polyester-type artificial hair adjacent to the polyamide-type artificial hair becomes polyamide-type artificial hair. Try to shrink as well. However, if this treatment is carried out by mixing with the polyester-based artificial hair without pre-treating the polyamide-based artificial hair, the polyester-based artificial hair having a lower shrinkage than the polyamide-based artificial hair will shrink like the polyamide-based artificial hair. I can't. As a result, a wavy step occurs in the artificial hair bundle, which is not preferable.

  On the other hand, according to the result of Example 9, the thermal contraction rate of the polyamide-based artificial hair as the second artificial hair is 0.5% or less, and according to the result of Example 7, the first artificial hair The polyester-based artificial hair has a heat shrinkage rate of 0.77%, and the difference in heat shrinkage rate between the two is small. Therefore, by pre-treating and heat-shrinking polyamide-based artificial hair as the second artificial hair in advance, the polyester-based artificial hair that is the first artificial hair is mixed and subjected to curling treatment. However, since the first artificial hair and the second artificial hair contract to the same extent, no wavy step occurs.

  From the above, when constructing the artificial hair bundle of the present invention, the heat shrinkage of the same degree as or less than that of the first artificial hair by pre-treating the polyamide fiber as the second artificial hair with heat treatment. By setting the ratio, it is possible to prevent the first artificial hair from generating a wavy step when the curling process is performed on the artificial hair bundle.

  As described above, according to the present invention, melt spinning with polyethylene terephthalate as a main component, and performing a stretching treatment and an alkali weight loss treatment so as to have a cross-sectional dimension comparable to that of natural hair, It is possible to provide artificial hair having a texture similar to that of natural hair by melt spinning polyethylene terephthalate and polybutylene terephthalate at a predetermined mass ratio so as to have an appropriate size and bending rigidity value to obtain artificial hair. it can. The artificial hair made of these polyester fibers can suppress the bundling of the artificial hair made of polyamide fibers without being bundled by itself, and can have the same bending rigidity value as that of natural hair. Furthermore, the artificial hair made of polyester fiber is used as the first artificial hair, and is mixed evenly at a predetermined ratio into the second artificial hair made of polyamide fiber and having the same size and bending rigidity as natural hair. Thus, the convergence of the second artificial hair can be suppressed. Therefore, in the wig in which these artificial hairs are planted on the wig base, the second artificial hair does not converge when the wig wearer's favorite hairstyle is prepared, and the first artificial hair and the second artificial hair are not focused. Since the bending rigidity value of hair can be approximated to that of natural hair, it can behave in the same manner as natural hair and have a natural texture.

  The best mode for carrying out the present invention described above can be variously modified as appropriate within the scope of the invention described in the claims.

Claims (13)

Artificial hair comprising fibers containing polyethylene terephthalate and polybutylene terephthalate in a mass ratio of 15:85 to 30:70 and having a bending rigidity value similar to that of natural hair. The artificial hair according to claim 1 , wherein a cross-sectional dimension perpendicular to the longitudinal direction of the fibers is in the range of 50 to 100 µm in average diameter. The artificial hair according to claim 1 or 2 , wherein the fiber has a bending rigidity value in a range of 6.5 to 7.8 x 10 ^-3 gf · cm ² / bars at a humidity of 40%. . The artificial hair according to claim 1 or 2 , wherein fine pores are formed in the longitudinal direction on the surface of the fiber. The first artificial hair made of polyester resin is dispersed in the second artificial hair made of polyamide resin and mixed at a predetermined ratio to form a bundle,
The artificial hair bundle, wherein the polyester resin contains polyethylene terephthalate and polybutylene terephthalate in a mass ratio of 15:85 to 30:70 , and the first artificial hair has a bending rigidity value similar to that of natural hair. . The second artificial hair has a sheath / core structure composed of a core part and a sheath part covering the core part, the core part is made of polyamide resin, and the sheath part is more rigid in bending than the core part. The artificial hair bundle according to claim 5 , comprising a low polyamide resin. The artificial hair bundle according to claim 5 , wherein the second artificial hair has a cross-sectional dimension and a bending rigidity value comparable to those of natural hair. The flexural rigidity, characterized in that it is in the range of ^{6.5~7.8 × 10 -3 gf · cm 2} / present in 40% humidity, artificial hair east of claim 5. The artificial hair bundle according to claim 5 , wherein a cross-sectional dimension perpendicular to the longitudinal direction of the first artificial hair is in the range of 50 to 70 µm in average diameter. A wig including a wig base and artificial hair implanted in the wig base,
As the artificial hair, a first artificial hair made of polyester resin and a second artificial hair made of polyamide resin are used,
A wig characterized in that the polyester resin contains polyethylene terephthalate and polybutylene terephthalate in a mass ratio of 15:85 to 30:70 , and the first artificial hair has a bending rigidity value comparable to that of natural hair. The second artificial hair has a sheath / core structure composed of a core part and a sheath part covering the core part, the core part is made of polyamide resin, and the sheath part has a bending rigidity value higher than that of the core part. The wig according to claim 10 , comprising a low polyamide resin. A method for producing the artificial hair according to any one of claims 1 to 4 ,
A first step of melting and discharging polyethylene terephthalate and polybutylene terephthalate as raw materials and a coloring raw material at a mass ratio of polyethylene terephthalate and polybutylene terephthalate of 15:85 to 30:70 ;
A second step of solidifying the discharged filamentary melt;
A third step of stretching the solidified thread-like member to a predetermined diameter;
A method for producing artificial hair, comprising: The method for producing artificial hair according to claim 12 , wherein in any one of the second step and the third step, an alkali weight loss treatment is performed to form micropores on the surface of the artificial hair.

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