Fiber bundles for hair ornaments and hair ornament products

Abstract

The present invention provides a fiber bundle for hair ornaments that can produce hair ornament products having a moderate volume above a certain level, a moderate spiral shape, and the ability to maintain a moderate spiral shape. [Solution] According to the present invention, a fiber bundle for hair ornaments is provided, comprising 250 to 2550 fibers, wherein the fiber bundle for hair ornaments includes hollow fibers having hollow portions extending in the longitudinal direction of the fibers, the mass of the fiber bundle for hair ornaments is 3.0 to 14.0 g, the fiber bundle for hair ornaments has a spiral shape, and when one end of the fiber bundle for hair ornaments is fixed to a support and the fiber bundle for hair ornaments is suspended vertically, the pitch of the spiral shape immediately afterward is defined as T0, and T0 is 20.0 to 40.0 mm.

Description

[Technical Field]

[0001] In hair accessories such as wigs, hairpieces, hair extensions, headbands, and doll hair, artificial hair is used in addition to human hair, or as a substitute for human hair. Materials that make up artificial hair fibers include acrylic resins, polyvinyl chloride resins, and polyester resins, and artificial hair fibers made from these resins are commercially available.

[0002] Patent Document 1 discloses artificial hair characterized by containing hollow fibers having a hollow portion with a hollow ratio of 10 to 50%. Patent Document 2 discloses a fiber for artificial hair characterized by having a void in the center of the fiber cross-section, the ratio of the area of ​​the void to the total area of ​​the fiber cross-section being 5% or more and 50% or less, the cross-sectional shape of the fiber cross-section being a flat multi-lobed shape, and the void having a first side and a second side that are inclined at an angle of 70 degrees or more and 110 degrees or less with respect to the long axis of the fiber cross-section. [Prior art documents] [Patent Documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2008-285772 [Patent Document 2] WO2014 / 196642 [Overview of the project] [Problems that the invention aims to solve]

[0004] Hair ornament products containing fiber bundles with a spiral (curly) shape are required to have a certain level of appropriate volume, an appropriate spiral shape, and the ability to maintain an appropriate spiral shape. However, conventional hair ornament products have found it difficult to achieve all three of these requirements.

[0005] The present invention has been made in view of these circumstances, and provides a fiber bundle for hair ornaments that can produce a hair ornament product having a certain or moderate volume, a moderate spiral shape, and the ability to maintain a moderate spiral shape. Furthermore, the present invention provides a hair ornament product that has a certain or moderate volume, a moderate spiral shape, and the ability to maintain a moderate spiral shape. [Means for solving the problem]

[0006] According to the present invention, a fiber bundle for hair ornaments is provided, comprising 250 to 2550 fibers, wherein the fiber bundle for hair ornaments includes hollow fibers having hollow portions extending in the longitudinal direction of the fibers, the mass of the fiber bundle for hair ornaments is 3.0 to 14.0 g, the fiber bundle for hair ornaments has a spiral shape, and when one end of the fiber bundle for hair ornaments is fixed to a support and the fiber bundle for hair ornaments is suspended vertically, the pitch of the spiral shape immediately afterward is defined as T0, and T0 is 20.0 to 40.0 mm.

[0007] The following are examples of various embodiments of the present invention. The embodiments shown below can be combined with each other. [1] A fiber bundle for hair ornaments comprising 250 to 2550 fibers, wherein the fiber bundle for hair ornaments includes hollow fibers having a hollow portion extending in the longitudinal direction of the fiber, the mass of the fiber bundle for hair ornaments is 3.0 to 14.0 g, the fiber bundle for hair ornaments has a spiral shape, and when one end of the fiber bundle for hair ornaments is fixed to a support and the fiber bundle for hair ornaments is suspended vertically, the pitch of the spiral shape immediately thereafter is defined as T0, and T0 is 20.0 to 40.0 mm. [2] A fiber bundle for hair ornaments comprising a plurality of fibers, wherein the fiber bundle for hair ornaments includes hollow fibers having a hollow portion extending in the longitudinal direction of the fiber, the circumference of the fiber bundle for hair ornaments is 32 to 56 mm, the mass of the fiber bundle for hair ornaments is 3.0 to 14.0 g, the fiber bundle for hair ornaments has a spiral shape, and when one end of the fiber bundle for hair ornaments is fixed to a support and the pitch of the spiral shape immediately after the fiber bundle for hair ornaments is suspended vertically is defined as T0, T0 is 20.0 to 40.0 mm. [3] A fiber bundle containing 250 to 2550 fibers, wherein the fiber bundle for hair ornaments includes hollow fibers having hollow portions extending in the longitudinal direction of the fibers, and when the area occupied by the hollow portion in a cross section perpendicular to the longitudinal direction of the fibers is defined as the hollow ratio, the average hollow ratio of the fibers contained in the fiber bundle for hair ornaments is 10% or more, the fiber bundle for hair ornaments has a spiral shape, and when one end of the fiber bundle for hair ornaments is fixed to a support and the pitch of the spiral shape immediately after the fiber bundle for hair ornaments is suspended vertically is defined as T0, T0 is 20.0 to 40.0 mm. A fiber bundle for hair ornaments according to [4][1] or [2], wherein the hollow fiber has a hollow ratio of 10% or more, where the area occupied by the hollow portion in a cross section perpendicular to the longitudinal direction of the fiber is the hollow ratio. A fiber bundle for hair ornaments as described in any of [5][1] to [4], wherein one end of the fiber bundle for hair ornaments is fixed to a support, and the diameter of the spiral shape when the fiber bundle for hair ornaments is suspended vertically is 14.0 to 22.0 mm. A fiber bundle for hair ornaments described in any of [6][1] to [5], wherein when the pitch of the spiral shape 24 hours after the fiber bundle for hair ornaments is suspended vertically is T1, the elongation rate after 24 hours E is expressed by the following formula (1). 24 A fiber bundle for hair ornaments, having a content of 2.0% or less. 24 =(T1-T0) / T0×100···(1) A fiber bundle described in any of [7][1] to [6], wherein when the pitch of the spiral shape 72 hours after the fiber bundle for hair ornaments is suspended vertically is T2, the elongation rate after 72 hours E is expressed by the following formula (2). 72 A fiber bundle for hair ornaments, having a content of 3.5% or less. 72 =(T2-T0) / T0×100···(2) A fiber bundle for hair ornaments, the fiber bundle described in any of [8][1] to [7], wherein the fiber is made of a resin composition comprising at least one selected from the group consisting of vinyl chloride resin, vinyl chloride-acrylonitrile copolymer, polyester resin, polyamide resin, polypropylene resin, polyethylene resin, polyacrylonitrile resin, and acrylonitrile-styrene copolymer. A hair ornament product comprising multiple fiber bundles for hair ornaments as described in any of [9][1] to [8]. [Effects of the Invention]

[0008] The present invention provides a fiber bundle for hair ornaments that can produce a hair ornament product having a certain or moderate volume, a moderate spiral shape, and the ability to maintain that moderate spiral shape. Furthermore, because the resulting hair ornament product has a certain or moderate volume, a moderate spiral shape, and the ability to maintain that moderate spiral shape, it can form an ideal hairstyle and maintain it for a long period of time. [Brief explanation of the drawing]

[0009] [Figure 1] Figure 1 is a schematic cross-sectional view of an artificial hair fiber according to one embodiment of the present invention. Figure 1A shows a circular cross-section, Figure 1B shows a circular cross-section having an inner protrusion and an outer protrusion, Figure 1C shows a two-lobed cross-section formed by joining two C-shapes, Figure 1D shows a three-lobed cross-section formed by joining three C-shapes, Figure 1E shows a roughly triangular cross-section, and Figure 1F shows a roughly square cross-section. [Figure 2]FIG. 2 is a schematic view of a fiber bundle for a hair ornament having a spiral shape according to the present invention, for explaining the pitch T and diameter of the spiral shape. [Figure 3] FIG. 3 is a schematic view for explaining a spiral shape forming step in a method for manufacturing a fiber bundle for a hair ornament according to an embodiment of the present invention. [Figure 4] FIG. 4 is a schematic view of the opening surface of a nozzle used in the melt spinning process of hollow fibers according to Examples and Comparative Examples and the cross-section of the hollow fibers. FIG. 4A shows a schematic view of the opening surface of the nozzle used in Example 1, and FIG. 4B shows a schematic view of the cross-section of the hollow fibers.

MODE FOR CARRYING OUT THE INVENTION

[0010] Hereinafter, embodiments of the present invention will be described with reference to the drawings. Each feature shown in the embodiments described below can be combined with each other. Also, an invention can be achieved independently for each feature. Furthermore, among the following embodiments, elements not defined in the claims are optional elements and can be omitted. At the end of the numerical values disclosed in the following description, any number (for example, one or two) of "0" may be added. For example, one or two "0" may be added after "1.4" to make "1.40" or "1.400".

[0011] 1. First Aspect The fiber bundle for a hair ornament according to the first aspect of the present invention includes 250 to 2550 fibers, the fiber bundle for a hair ornament includes hollow fibers having a hollow portion extending in the longitudinal direction of the fibers, the mass of the fiber bundle for a hair ornament is 3.0 to 14.0 g, the fiber bundle for a hair ornament has a spiral shape, and when the pitch of the spiral shape immediately after fixing one end of the fiber bundle for a hair ornament to a support and suspending the fiber bundle for a hair ornament in the vertical direction is T0, T0 is 20 to 40 mm.

[0012] 1.1 Hollow Fibers The fiber bundle for a hair ornament according to an embodiment of the present invention includes hollow fibers having a hollow portion extending in the longitudinal direction of the fibers.

[0013] 1.1.1 Shape of hollow fibers The hollow portion can be present continuously for 10 cm or more in the longitudinal direction of the hollow fiber. The hollow fiber can be an artificial hair fiber. Because the hollow fiber has a hollow portion, it is lightweight, and the hair ornament according to the present invention, because it contains hollow fibers, can reduce the overall mass of the fiber bundle, and furthermore, it can form the desired voluminous hairstyle while reducing the mass. In addition, because the overall mass of the fiber bundle can be reduced, it is possible to maintain an appropriate spiral shape, a wide range of hairstyles including heavy long styles can be achieved, damage to natural hair and scalp can be reduced, and waste and environmental burden can be reduced, among other advantages.

[0014] A hollow fiber according to one embodiment of the present invention has one or more hollow sections, and may have two or more hollow sections. The number of hollow sections may be, for example, 1, 2, 3, 4, 5, 6, 7, 8, 9, or 10, and may be within a range between any two of the numbers exemplified herein. A hollow fiber according to one embodiment of the present invention may have a single hollow portion.

[0015] Figure 1 shows an example of a cross-section perpendicular to the longitudinal direction of a hollow fiber according to one embodiment of the present invention. The shape of the cross-section perpendicular to the longitudinal direction of the hollow fiber according to one embodiment of the present invention can be any one selected from a circular shape (Figures 1A and 1B), an elliptical shape, a two-lobed shape formed by joining two C-shapes (Figure 1C), a three-lobed shape formed by joining three C-shapes (Figure 1D), a four-lobed shape formed by joining four or more C-shapes, and a roughly triangular shape (Figure 1E), a roughly quadrilateral shape (Figure 1F), and a roughly polygonal shape.

[0016] The method for producing hollow fibers according to the present invention is not particularly limited, but hollow fibers are generally obtained by melt spinning a resin composition. Hollow fibers having a hollow portion are formed by melt extrusion from a nozzle having one C-shaped nozzle hole or a nozzle having multiple holes, as shown in Figure 1 of Patent Document 1. Here, at least a portion of the resin composition is divided while passing through the nozzle, but after being discharged from the nozzle hole, the resin composition pieces come into contact with each other and fuse together, forming a hollow portion. Hollow fibers according to one embodiment of the present invention may have a joint surface 14 (shown by a dashed line in Figure 1) where the resin composition pieces are fused together during the melt extrusion process. Furthermore, the joint portion 13, which is the region including the joint surface 14, may have at least one of an inner protrusion 16 that protrudes toward the hollow portion and an outer protrusion 17 that protrudes toward the outside of the hollow fiber (Figure 1B). Figure 1B shows the case where the fiber cross-section is circular, but even when the hollow portion has a different shape, at least one of the following can be provided at the joint: an inner protrusion that projects toward the hollow portion and an outer protrusion that projects toward the outside of the hollow fiber. In this way, by providing the protrusions and making the joint 13 thicker, the joint strength can be improved by increasing the area of ​​the joint surface 14 where the resin compositions are fused together. Details of the manufacturing method will be described later.

[0017] The hollow fiber according to one embodiment of the present invention can have a major axis in a cross-section perpendicular to the longitudinal direction of the fiber of 30 to 300 μm. The major axis can be, for example, 30, 40, 50, 60, 70, 80, 90, 100, 110, 120, 130, 140, 150, 160, 170, 180, 190, 200, 210, 220, 230, 240, 250, 260, 270, 280, 290, or 300 μm, and may be within the range of any two of the values ​​exemplified here.

[0018] In the hollow fiber according to one embodiment of the present invention, it is preferable that the hollow ratio is 10% or more, where the area ratio occupied by the hollow portion 15 in a cross-section perpendicular to the longitudinal direction of the hollow fiber is defined as the hollow ratio. The hollow ratio may be, for example, 10, 15, 20, 25, 30, 35, 40, 45, 50, or 55%, and may be within the range of any two of the values ​​exemplified here.

[0019] The hollow ratio can be calculated using the following formula. Hollow ratio = (Area enclosed by inner surface 12) / (Area enclosed by outer surface 11) × 100 The area enclosed by the outer surface 11 represents the cross-sectional area assuming that the hollow fiber does not have a hollow portion. The hollow ratio can be determined by cutting the hollow fiber perpendicular to its longitudinal direction, observing the cut surface with a laser microscope or scanning electron microscope, and performing image analysis. Specifically, it can be determined by the method described in the examples. The hollow ratio can be the average value obtained from observing multiple locations; for example, it can be the average value of 30 locations. By setting the hollow ratio above the lower limit mentioned above, the advantages of having a hollow section can be more reliably obtained. If the hollow ratio exceeds the upper limit mentioned above, it is undesirable because it leads to a decrease in structural retention, an increase in rigidity due to an increase in fiber diameter, and a deterioration of tactile feel.

[0020] 1.1.2 Composition of Hollow Fibers The resin composition constituting the hollow fiber according to one embodiment of the present invention is not particularly limited and may include at least one of the following: vinyl chloride resin, vinyl chloride-acrylonitrile copolymer, polyester resin such as polyethylene terephthalate, polyamide resin, polypropylene resin (PP resin), polyethylene resin (PE resin), polyacrylonitrile resin (PAN resin), polylactic acid resin (PLA resin), and acrylonitrile-styrene copolymer. The hollow fiber according to one embodiment of the present invention preferably contains vinyl chloride resin from the viewpoint of making it easier for the fiber bundle for hair ornaments to maintain a helical shape, making it easier to obtain a die swell effect, and making it easier to obtain a hollow fiber having a protruding portion with an increased area of ​​the joint surface where the resin compositions are fused together, thereby improving the bonding strength. Furthermore, the hollow fiber according to one embodiment of the present invention preferably contains vinyl chloride resin and AS resin (acrylonitrile styrene resin).

[0021] The vinyl chloride resin according to one embodiment of the present invention may contain a vinyl chloride polymer containing monomer units (vinyl chloride monomer units) derived from vinyl chloride monomer. The vinyl chloride monomer unit content in the vinyl chloride resin may be, for example, 50, 55, 60, 65, 70, 75, 80, 85, 90, 95, or 100, and may be within the range of any two of the values ​​exemplified herein. The polyvinyl chloride resin according to the present invention may contain a homopolymer obtained by homopolymerizing vinyl chloride monomer, and / or a copolymer containing a vinyl chloride monomer and monomer units derived from other monomers copolymerizable with vinyl chloride monomer. Examples of copolymers include copolymers of vinyl chloride and vinyl esters such as vinyl chloride-vinyl acetate copolymer and vinyl chloride-vinyl propionate copolymer, copolymers of vinyl chloride and olefins such as vinyl chloride-ethylene copolymer and vinyl chloride-propylene copolymer, and vinyl chloride-acrylonitrile copolymer. Furthermore, the polyvinyl chloride resin according to the present invention may consist of one type of vinyl chloride polymer, or it may contain two or more types of vinyl chloride polymers.

[0022] The resin composition constituting the hollow fiber according to one embodiment of the present invention preferably contains 50% by mass or more of vinyl chloride resin in 100% by mass of the resin contained in the resin composition, and more preferably 65% ​​by mass or more. Specifically, the content of vinyl chloride resin relative to 100% by mass of the resin contained in the resin composition is, for example, 50, 55, 60, 65, 70, 75, 80, 85, 90, 95, or 100% by mass, and may be within the range of any two of the values ​​exemplified herein.

[0023] The resin composition constituting the hollow fiber according to one embodiment of the present invention preferably contains 50% by mass or more of vinyl chloride monomer units in 100% by mass of the resin contained in the resin composition, and more preferably 65% ​​by mass or more. Specifically, the content of vinyl chloride monomer units relative to 100% by mass of the resin contained in the resin composition is, for example, 50, 55, 60, 65, 70, 75, 80, 85, 90, 95, or 100% by mass, and may be within the range of any two of the values ​​exemplified herein.

[0024] The resin composition constituting the hollow fiber according to one embodiment of the present invention may also contain resins other than vinyl chloride resins, and may contain both vinyl chloride resins and resins other than vinyl chloride resins. When the resin composition constituting the hollow fiber according to one embodiment of the present invention contains both vinyl chloride resins and resins other than vinyl chloride resins, the resins other than vinyl chloride resins preferably have excellent compatibility with vinyl chloride resins, and the compatibility can be adjusted by adjusting the type and amount of monomer units contained in the other resins and their molecular weights. AS resins (acrylonitrile styrene resins) are copolymers having styrene monomer units and acrylonitrile monomer units, and may optionally contain other monomer units copolymerizable with these. AS resins may contain styrene monomer units in amounts of, for example, 60, 65, 70, 75, 80, 85, or 90% by mass per 100% by mass of AS resin, and may be within a range between any two of the values ​​exemplified here. AS resins may also contain acrylonitrile monomer units in amounts of, for example, 10, 15, 20, 25, 30, 35, or 40% by mass per 100% by mass of AS resin, and may be within a range between any two of the values ​​exemplified here.

[0025] The hollow fiber according to one embodiment of the present invention may contain other components as needed. Other components include antistatic agents, heat stabilizers, lubricants, colorants, processing aids, plasticizers, reinforcing agents, ultraviolet absorbers, antioxidants, fillers, flame retardants, pigments, initial color improvers, conductivity imparters, fragrances, and the like.

[0026] Furthermore, the hollow fiber according to one embodiment of the present invention may have a surface treatment agent attached to its surface. The surface treatment agent can be one or more selected from the group consisting of oils, nonionic surfactants, and cationic surfactants. The amount of surface treatment agent attached is preferably 0.05 to 1.0% by mass, and more preferably 0.1 to 0.5% by mass, based on 100% by mass of the fiber. The amount of surface treatment agent attached to the fiber may be, for example, 0.05, 0.06, 0.07, 0.08, 0.09, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, or 1.0% by mass, based on 100% by mass of the fiber, and may be within the range of any two of the values ​​exemplified here.

[0027] <Oil content> The surface treatment agent preferably contains oil. Examples of oils include fatty acid skeleton-containing compounds (fatty acids, glycerides, and organic acid glycerides), polyalkylene glycols, alkyl alkylates, and mineral oils.

[0028] <Nonionic surfactants> Examples of nonionic surfactants include polyoxyethylene fatty acid esters, polyoxyalkylene alkyl ethers, polyoxyethylene alkyl ethers, polyoxyethylene hydrogenated castor oil ethers, polyoxyethylene alkylphenyl ethers, sorbitan fatty acid esters, polyoxyethylene sorbitan fatty acid esters, sucrose fatty acid esters, glycerin fatty acid esters, polyoxyethylene polyoxypropylene block polymers, polyoxyethylene alkylamine ethers, and fatty acid alkanolamides.

[0029] <Cationic surfactants> Examples of cationic surfactants include quaternary ammonium salts having alkyl groups such as oxyalkylene groups, alkyltrimethylammonium salts, dialkyldimethylammonium salts, and alkyldimethylethylammonium salts, ammonium salts having ester bonds such as stearooxymethylpyridinium salts, fatty acid triethanolamine, and fatty acid triethanolamine formate, and amine derivatives having alkyl chains such as polyoxyethylene alkylamine, N-alkylpropyleneamine, and N-alkyl polyethylene polyamine.

[0030] 1.1.3 Method for manufacturing hollow fibers A method for producing hollow fibers according to one embodiment of the present invention includes a resin composition preparation step and a spinning step, and may also include a stretching step and a heat treatment step. A method for producing hollow fibers according to one embodiment of the present invention may also include a surface treatment agent application step.

[0031] 1.1.3.1 Resin composition preparation process In the resin composition preparation process, a resin composition can be obtained by mixing raw materials containing a resin. Here, the raw materials include a base resin and may contain other components as needed.

[0032] The mixing method is not particularly limited, and conventionally known methods can be used. For example, a powdered resin composition (powder compound) can be obtained using known mixing equipment such as a Henschel mixer, super mixer, or ribbon blender, and then the powder compound can be melt-mixed to obtain a pelletized resin composition (pellet compound). The method for producing the powder compound can be either hot blending or cold blending. For example, in order to reduce volatile matter from the resin composition, hot blending can be performed with a cut-off temperature of 105 to 155°C during mixing. The method for producing the pellet compound can be the same as that for producing pellet compounds of general polyvinyl chloride resins. For example, a pellet compound can be produced using a kneader such as a single-screw extruder, an asymmetric twin-screw extruder, a conical twin-screw extruder, a co-screw extruder, a cone kneader, a planetary gear extruder, or a roll kneader. The conditions for producing the pellet compound are not particularly limited, but it is preferable to set the resin temperature to 185°C or lower in order to prevent thermal degradation of the resin composition. Furthermore, a mesh can be installed near the tip of the screw to remove small amounts of metal fragments from the screw or fibers from protective gloves that may be mixed into the pellet compound. The cold-cut method can be used for pellet production. Measures may be taken to remove metal shavings (fine powder generated during pellet production) that may be mixed in during the cold-cut process. Also, since the cutter blades may become dull and more prone to generating metal shavings after prolonged use, it is preferable to replace them as needed.

[0033] 1.1.3.2 Spinning Process In the spinning process, the resin composition is melt-spun to obtain fibers. As an example, the resin composition (e.g., pellet compound) can be extruded from a heated cylinder through a nozzle and melt-spun. Conventional extruders can be used as the extruder, such as single-screw extruders, opposite-direction twin-screw extruders, and conical twin-screw extruders.

[0034] The conditions for melt spinning can be appropriately set according to the type of resin composition so that the resin melts and a bonded structure is formed at the joint. For example, the cylinder temperature can be 150 to 190°C and the nozzle temperature can be 155 to 195°C. The extrusion speed is preferably 5 to 20 kg / h, and more preferably 8 to 18 kg / h. When the temperature and extrusion speed are within this range, hollow sections are easily formed, resulting in a suitable size.

[0035] The undrawn yarn, melt-spun from the nozzle, is introduced into a heating cylinder (e.g., heating cylinder temperature 250°C) for instantaneous heat treatment and can be wound up by a take-up machine installed directly below the nozzle (e.g., approximately 4.5 m).

[0036] A nozzle for melt extrusion of hollow fibers according to one embodiment of the present invention can be appropriately selected according to the shape of the fiber to be obtained, the hollowness ratio, and the average hollowness ratio. For example, when manufacturing hollow fibers having a circular cross-section as shown in Figure 1A, a nozzle with C-shaped nozzle holes can be used. When manufacturing hollow fibers having a two-lobed cross-section formed by joining two C-shapes, as shown in Figure 1C, a nozzle with two C-shaped nozzle holes can be used. When manufacturing hollow fibers having a three-lobed cross-section formed by joining three C-shapes, as shown in Figure 1D, a nozzle with three C-shaped nozzle holes can be used. Furthermore, when manufacturing hollow fibers having a roughly triangular cross-section as shown in Figure 1E, a nozzle with three rod-shaped nozzle holes can be used. When manufacturing hollow fibers having a roughly square cross-section as shown in Figure 1F, a nozzle with four rod-shaped nozzle holes can be used.

[0037] For example, when manufacturing an artificial hair fiber having three joining surfaces 14 and three joining portions 13, as shown in Figure 4B, where each joining portion 13 has a circular cross-section with only an inner protrusion 16, a nozzle having the opening surface shown in Figure 4A can be used. The shape of the nozzle hole 400 will be described with reference to Figure 4A. The nozzle opening surface has three openings, and each opening surface has an outer nozzle hole surface 41 and an inner nozzle hole surface 42. The three openings are spaced apart by a separation portion 43.

[0038] Furthermore, the opening may have at least one of the following: an inner nozzle hole protrusion 44 and an outer nozzle hole protrusion (not shown). The inner nozzle hole protrusion 44 corresponds to the inner protrusion 16 in the artificial hair fiber, and the outer nozzle hole protrusion 45 corresponds to the formation of the outer protrusion 17. By providing the inner nozzle hole protrusion 44 and the outer nozzle hole protrusion, the bonding surface in the hollow fiber can be further increased. Figure 4A shows a nozzle with only the inner nozzle hole protrusion 44.

[0039] Furthermore, the inner nozzle hole protrusion 44 and the outer nozzle hole protrusion are not essential for the formation of the protrusion in the hollow fiber cross-section. The resin composition may expand due to the die swell effect after being extruded from the nozzle hole, and it is thought that this may result in the formation of a joint (protrusion) with a larger joint surface area. Therefore, even if the nozzle does not have an inner nozzle hole protrusion or an outer nozzle hole protrusion on the nozzle opening surface, a protrusion can still be formed.

[0040] The nozzle preferably has nozzle holes capable of simultaneously dispensing multiple fibers, and it is preferable that the hollowness ratio of the resulting hollow fibers is adjusted to fall within a desired range.

[0041] 1.1.3.3 Stretching and Heat Treatment Processes A method for manufacturing hollow fibers according to one embodiment of the present invention may also include a stretching step and a heat treatment step. In the drawing process, the undrawn hollow fibers obtained in the melt spinning process described above are drawn using a drawing machine to obtain drawn hollow fibers. For example, in the drawing process, the undrawn hollow fibers can be drawn 2 to 5 times in an air atmosphere at 90 to 110°C. Furthermore, in the heat treatment process, the stretched hollow fibers can be heat-treated using a heat treatment machine. For example, in the heat treatment process, the stretched hollow fibers are heat-treated at 90-110°C in an air atmosphere to reduce their size to 0.5-3.0 times their original size, thereby thermally shrinking the entire length of the fibers and obtaining heat-treated hollow fibers of the desired fineness.

[0042] 1.1.3.4 Surface treatment agent application process A manufacturing method according to one embodiment of the present invention may further include a surface treatment agent application step. The surface treatment agent application step is not particularly limited as long as the surface treatment agent can be applied to the fibers, and any application method can be used. For example, the surface treatment agent may be applied to the fibers by a roll transfer method, or the fibers may be applied by immersing them in a solution containing the surface treatment agent. The amount of surface treatment agent applied to the fibers can be adjusted by adjusting the amount of preparation or by adjusting the concentration of each component other than the solvent in the solution containing the surface treatment agent.

[0043] 1.1.3.5 Gear Machining Process A method for manufacturing fibers for artificial hair according to one embodiment of the present invention may also include a gear processing step. In the gear processing process, crimping can be applied by passing a fiber bundle between two meshing, high-temperature gears. The material of the gears used in the gear processing process, the shape of the gear's wave pattern, and the number of gears are not particularly limited. In the gear processing process, the shape of the resulting artificial hair fibers can be controlled by appropriately adjusting the groove depth of the gear's wave pattern, the surface temperature of the gears, the processing speed, and the pressure conditions between the gears, taking into consideration the fiber material and fineness. There are no particular limitations on these processing conditions, but as an example, the groove depth of the gear's wave pattern can be 0.2 to 6 mm, preferably 0.5 to 5 mm, the surface temperature of the gears can be 30 to 100°C, preferably 40 to 80°C, and the processing speed can be 0.5 to 10 m / min, preferably 1.0 to 8.0 m / min.

[0044] 1.1.4 Other Fibers In one embodiment of the present invention, the fiber bundle for hair ornaments may include fibers other than the hollow fibers described above, and may also include solid artificial hair fibers and / or human hair. Furthermore, the composition, fineness, and manufacturing method of solid artificial hair fibers can be the same as those of the hollow fibers described above. Solid artificial hair fibers can be obtained by changing the shape of the nozzle in the melt spinning process in the manufacturing method of the hollow fibers described above to one suitable for dispensing solid fibers. The fiber bundle for hair ornaments according to the present invention can have a hollow fiber content of 50% by mass or more when the total fiber content in the fiber bundle for hair ornaments is considered to be 100% by mass, for example, 50, 55, 60, 65, 70, 75, 80, 85, 90, 95, or 100% by mass, and may be within the range of any two of the values ​​exemplified here. A fiber bundle for hair ornaments according to one embodiment of the present invention may be composed of hollow fibers.

[0045] 1.2 Fiber bundles for hair ornaments A fiber bundle for hair ornaments according to one embodiment of the present invention contains 250 to 2550 fibers per bundle. The number of fibers contained in one bundle of hair ornament fiber bundles is, for example, 250, 300, 350, 400, 450, 500, 550, 600, 650, 700, 750, 800, 850, 900, 950, 1000, 1050, 1100, 1150, 1200, 1250, 1300, 1350, 1400, 1450, and 1500. These numbers are 1550, 1600, 1650, 1700, 1750, 1800, 1850, 1900, 1950, 2000, 2050, 2100, 2150, 2200, 2250, 2300, 2350, 2400, 2450, 2500, and 2550, and may be within the range of any two of the numbers exemplified here.

[0046] The mass of a fiber bundle for hair ornaments according to one embodiment of the present invention is 3.0 to 14.0 g per bundle. The mass of a fiber bundle for hair ornaments may be, for example, 3.0, 3.5, 4.0, 4.5, 5.0, 5.5, 6.0, 6.5, 7.0, 7.5, 8.0, 8.5, 9.0, 9.5, 10.0, 10.5, 11.0, 11.5, 12.0, 12.5, 13.0, 13.5, or 14.0 g, and may be within the range of any two of the values ​​exemplified here.

[0047] A fiber bundle for hair ornaments according to one embodiment of the present invention contains hollow fibers, and by keeping the number of fibers in one bundle and the mass per bundle within the above numerical range, it has sufficient volume and excellent retention of a spiral shape. The mass per bundle can be controlled not only by adjusting the number of fibers per bundle, but also, for example, by adjusting the proportion and content of hollow fibers.

[0048] The fiber bundle for hair ornaments according to the present invention has a spiral shape. The spiral shape will be explained with reference to Figure 2. Figure 2 is a schematic diagram of a fiber bundle for hair ornaments, showing the state in which one end of the fiber bundle 200 for hair ornaments is fixed to a support 21 and the fiber bundle 200 for hair ornaments is suspended vertically. The fiber bundle for hair ornaments according to the present invention has a spiral shape (approximately spiral shape), and can be a helical spiral shape in which the fiber bundle is wound around a virtual cylinder. In the present invention, pitch T indicates the distance in the axis direction of the center of the spiral when the spiral completes one revolution around the virtual cylinder. Pitch T can also be the distance (wavelength) between the peaks of the wave shape obtained by projecting the spiral shape onto a plane parallel to the central axis of the spiral shape. In the present invention, diameter indicates the diameter of the spiral. Diameter can also be the amplitude of the wave shape obtained by projecting the spiral shape onto a plane parallel to the central axis of the spiral shape.

[0049] The fiber bundle for hair ornaments according to the present invention has a spiral pitch T0 of 20.0 to 40.0 mm immediately after fixing one end of the fiber bundle to a support and suspending the fiber bundle vertically. The pitch T0 is, for example, 20.0, 22.0, 24.0, 26.0, 28.0, 30.0, 32.0, 34.0, 36.0, 38.0, or 40.0 mm, and may be within the range of any two of the values ​​exemplified here. The fiber bundle for hair ornaments according to the present invention has a pitch within the above numerical range, possesses an ideal shape, and excels at maintaining an ornamental shape. The pitch T0 can be the average value of the 2nd to 11th turns of the spiral (N=10) from the top when suspended vertically, and can be measured specifically by the method described in the examples. The pitch T0 can be controlled by adjusting the manufacturing conditions of the fiber bundle for hair accessories, specifically by adjusting the type and amount of fibers contained in the fiber bundle, as well as the method of winding the fiber bundle in the spiral shape formation process.

[0050] The fiber bundle for hair ornaments according to the present invention preferably has a spiral diameter of 14.0 to 22.0 mm when one end of the fiber bundle for hair ornaments is fixed to a support and the fiber bundle for hair ornaments is suspended vertically. The diameter may be, for example, 14.0, 14.5, 15.0, 15.5, 16.0, 16.5, 17.0, 17.5, 18.0, 18.5, 19.0, 19.5, 20.0, 20.5, 21.0, 21.5, or 22.0 mm, and may be within the range of any two of the values ​​exemplified here. The fiber bundle for hair ornaments according to the present invention has a diameter within the above numerical range, possesses an ideal shape, and excels at maintaining that ideal shape. The diameter can be the diameter of the spiral shape immediately after fixing one end of the hair accessory fiber bundle to a support and suspending the hair accessory fiber bundle vertically, or the average value of the 2nd to 11th spirals (N=10) from the top when suspended vertically, and can be measured specifically by the method described in the examples. The diameter can be controlled by adjusting the manufacturing conditions of the fiber bundle for hair ornaments, specifically by adjusting the type and amount of fibers contained in the fiber bundle, as well as the diameter of the jig used to wind the fiber bundle in the spiral shape formation process.

[0051] The fiber bundle for hair ornaments according to the present invention preferably has a circumference of 32 to 56 mm. The circumference may be, for example, 32, 34, 36, 38, 40, 42, 44, 46, 48, 50, 52, 54, or 56 mm, and may be within the range of any two of the values ​​exemplified herein. The perimeter can be defined as the minimum perimeter when the fiber bundle is bundled so that the cross-section of the bundle is approximately circular, and can be measured by the method described in the examples. When the circumference is within the above numerical range, the fiber bundle for hair ornaments will have a more appropriate volume and will be better able to maintain its spiral shape. The circumference can be controlled by adjusting the manufacturing conditions of the fiber bundle for hair ornaments, specifically by adjusting the type and amount of fibers contained in the fiber bundle.

[0052] The fiber bundle for hair ornaments according to the present invention preferably has an average hollowness ratio of 10% or more among the fibers contained in the fiber bundle for hair ornaments. The average hollowness ratio may be, for example, 10, 15, 20, 25, 30, 35, 40, 45, 50, or 55%, and may be within the range of any two of the values ​​exemplified herein. Furthermore, the fiber bundle for hair ornaments according to the present invention may contain solid fibers and / or human hair. In that case, it is preferable that the average hollowness of the fibers, including the solid fibers and / or human hair, contained in the fiber bundle for hair ornaments falls within the above numerical range. The average hollowness ratio of the fibers contained in a fiber bundle for hair ornaments can be controlled by adjusting the hollowness ratio of each hollow fiber and the percentage of hollow fibers present.

[0053] The fiber bundle for hair ornaments according to the present invention is fixed at one end to a support, and when the spiral pitch immediately after the fiber bundle is suspended vertically is defined as T0, and the spiral pitch 24 hours after the fiber bundle is suspended vertically is defined as T1, the elongation rate after 24 hours is expressed by the following formula (1) E 24 It is preferable that the amount is 2.0% or less. E 24 =(T1-T0) / T0×100···(1)

[0054] E 24 This can be 0-2.0%, and preferably 0.5-2.0%. For example, it could be 0, 0.2, 0.4, 0.6, 0.8, 1.0, 1.2, 1.4, 1.6, 1.8, or 2.0%, and may be within the range of any two of the values ​​exemplified here.

[0055] Fix one end of the fiber bundle for hair ornaments to the support, and when the pitch of the spiral shape immediately after hanging the fiber bundle for hair ornaments vertically is T0 and the pitch of the spiral shape 72 hours after hanging the fiber bundle for hair ornaments vertically is T2, the elongation rate E after 72 hours represented by the following formula (2) 72 is preferably 3.5% or less. E 72 =(T2 - T0) / T0 × 100 ··· (2)

[0056] E 72 = is preferably 0 to 3.5%, for example, 0, 0.2, 0.4, 0.6, 0.8, 1.0, 1.2, 1.4, 1.6, 1.8, 2, 2.2, 2.4, 2.6, 2.8, 3.0, 3.2, 3.4, 3.5%, and may also be within the range between any two of the numerical values exemplified here.

[0057] The elongation rate E after 24 hours 24 and the elongation rate E after 72 hours 72 can be measured by the method described in the examples. The elongation rate E after 24 hours 24 and the elongation rate E after 72 hours 72 can be controlled by adjusting the manufacturing conditions of the fiber bundle for hair ornaments. Specifically, it can be controlled by adjusting the type and amount of fibers contained in the fiber bundle, as well as the manufacturing conditions of the spiral shape forming process, etc. The elongation rate E after 24 hours 24 and / or the elongation rate E after 72 hours 72 can also be used as an index to determine whether an appropriate spiral shape can be maintained even over a longer period. By adjusting each condition, the elongation rate E after 24 hours 24 and / or the elongation rate E after 72 hours 72 is within the above numerical range, and the fiber bundle for hair ornaments can maintain an appropriate spiral shape for a longer period.

[0058] The pitch T1 after 24 hours is preferably 20.0 to 40.0 mm. The pitch T1 may be, for example, 20.0, 22.0, 24.0, 26.0, 28.0, 30.0, 32.0, 34.0, 36.0, 38.0, or 40.0 mm, and may be within the range of any two of the values ​​exemplified here. The pitch T2 after 72 hours is preferably 20.0 to 40.0 mm. The pitch T2 may be, for example, 20.0, 22.0, 24.0, 26.0, 28.0, 30.0, 32.0, 34.0, 36.0, 38.0, or 40.0 mm, and may be within the range of any two of the values ​​exemplified here. The pitch T1 after 24 hours and / or the pitch T2 after 72 hours can also be used as an indicator of whether a suitable spiral shape can be maintained over a longer period of time. By adjusting each condition so that the pitch T1 after 24 hours and / or the pitch T2 after 72 hours are within the above numerical range, the fiber bundle for hair ornaments can maintain a suitable spiral shape for a longer period of time.

[0059] 1.3 Method for manufacturing fiber bundles for hair ornaments A method for manufacturing a fiber bundle for hair ornaments according to one embodiment of the present invention may include a spiral shape forming step. In the spiral shape formation process, a fiber bundle containing the hollow fibers is heated while wrapped around a cylindrical jig, thereby obtaining a spiral-shaped fiber bundle for hair accessories. The spiral shape formation process will now be described with reference to Figure 3. As an example, in the spiral shape formation process, a fiber bundle 300 is wrapped around a metal pipe 31, and the metal pipe 31 with the fiber bundle 300 wrapped around it is placed in an oven and heated to obtain a fiber bundle for hair ornaments having a spiral shape.

[0060] The total length of the fiber bundle used in the spiral shape formation process (total length before spiral shape formation) can be 1000 to 2000 mm, for example, 1000, 1100, 1200, 1300, 1400, 1500, 1600, 1700, 1800, 1900, or 2000 mm, and may be within the range of any two of the values ​​exemplified here. The number of fibers contained in one fiber bundle and the mass of the fiber bundle are as described above.

[0061] The cylindrical jig (pipe 31) is not particularly limited as long as it is heat-resistant, and the diameter of the jig can be 5 to 20 mm, for example, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20 mm, and may be within the range of any two of the values ​​exemplified here.

[0062] The heating temperature and heating time can be appropriately set according to the material that makes up the fibers contained in the fiber bundle. It is preferable that the heating temperature and heating time be set to a temperature at which the resin contained in the fibers shrinks sufficiently. For example, the heating temperature could be 70, 75, 80, 85, 90, 95, 100, 105, or 110°C, and could be within the range of any two of the values ​​exemplified here. For example, the heating time could be, for instance, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70, 75, 80, 85, 90, 95, or 100 minutes, and could be within the range of any two of the values ​​exemplified here.

[0063] In the spiral shape formation process, it is preferable to wrap the fiber bundles around the pipe 31 such that the length X of the fiber bundles in the longitudinal direction of the pipe 31 after wrapping is 300 to 800 mm. The length X of the fiber bundles in the longitudinal direction of the pipe 31 after wrapping is, for example, 300, 350, 400, 450, 500, 550, 600, 650, 700, 750, or 800 mm, and may be within the range of any two of the values ​​exemplified here. It is preferable to wrap the fiber bundles around the pipe at equal intervals.

[0064] By setting the conditions in the spiral shape formation process as described above, the characteristics of the resulting fiber bundle for hair accessories, particularly the characteristics related to the spiral shape, can be adjusted to a higher degree. This makes it easier to obtain fiber bundles for hair accessories that have a certain level of appropriate volume, an appropriate spiral shape, and can maintain an appropriate spiral shape.

[0065] 1.4 Hair accessories A hair ornament product according to one embodiment of the present invention includes a plurality of the above-mentioned fiber bundles for hair ornaments. The hair ornament product may include 2 to 30 of the above-mentioned fiber bundles for hair ornaments, for example, 2, 5, 10, 15, 20, 25, or 30 bundles, and may be within a range between any two of the numbers exemplified herein. Users can attach 1 to 50 of the above-mentioned hair ornament products to their head (scalp hair, natural hair), for example, 1, 2, 3, 4, 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, and may be within the range of any two of the numbers exemplified here.

[0066] The hair ornament product according to the present invention can be used by attaching it to the wearer's hair (natural hair). The method of attachment is not particularly limited, and known methods can be used; for example, the hair ornament product can be tied to the natural hair. The hair ornament product according to the present invention includes the above-mentioned fiber bundle for hair ornaments, and the resulting hair ornament product has a certain or moderate volume, a moderate spiral shape, and can maintain a moderate spiral shape, so it can form an ideal hairstyle and maintain it for a long period of time.

[0067] 2. Second perspective A fiber bundle for hair ornaments according to a second aspect of the present invention comprises a plurality of fibers, the fiber bundle for hair ornaments comprises hollow fibers having a hollow portion extending in the longitudinal direction of the fiber, the circumference of the fiber bundle for hair ornaments is 32 to 56 mm, the mass of the fiber bundle for hair ornaments is 3.0 to 14.0 g, the fiber bundle for hair ornaments has a spiral shape, and when one end of the fiber bundle for hair ornaments is fixed to a support and the fiber bundle for hair ornaments is suspended vertically, the pitch of the spiral shape immediately thereafter is defined as T0, T0 is 20.0 to 40.0 mm.

[0068] 2.1 Hollow Fibers A fiber bundle for hair ornaments according to one embodiment of the present invention includes hollow fibers having a hollow portion extending in the longitudinal direction of the fiber. The shape, composition, and manufacturing method of the hollow fibers according to the second aspect may be the same as in the first aspect.

[0069] 2.2 Fiber bundles for hair ornaments A fiber bundle for hair ornaments according to one embodiment of the present invention comprises multiple fibers and has a circumference of 32 to 56 mm. The circumference may be, for example, 32, 34, 36, 38, 40, 42, 44, 46, 48, 50, 52, 54, or 56 mm, and may be within the range of any two of the values ​​exemplified herein. The perimeter can be defined as the minimum perimeter when the fiber bundle is bundled so that the cross-section of the bundle is approximately circular, and can be measured by the method described in the examples.

[0070] The mass of a fiber bundle for hair ornaments according to one embodiment of the present invention is 3.0 to 14.0 g per bundle. The mass of a fiber bundle for hair ornaments may be, for example, 3.0, 3.5, 4.0, 4.5, 5.0, 5.5, 6.0, 6.5, 7.0, 7.5, 8.0, 8.5, 9.0, 9.5, 10.0, 10.5, 11.0, 11.5, 12.0, 12.5, 13.0, 13.5, or 14.0 g, and may be within the range of any two of the values ​​exemplified here.

[0071] A fiber bundle for hair ornaments according to one embodiment of the present invention contains hollow fibers, and by keeping the circumference of the fiber bundle and the mass per bundle within the above numerical range, it has sufficient volume and excellent retention of a spiral shape. The circumference of the fiber bundle and the mass per bundle can also be controlled by adjusting the number of fibers per bundle, as well as by adjusting, for example, the proportion and content of hollow fibers.

[0072] The fiber bundle for hair ornaments according to the present invention has a spiral shape, which is as described in the first aspect. The fiber bundle for hair ornaments according to the present invention has a spiral pitch T0 of 20.0 to 40.0 mm immediately after fixing one end of the fiber bundle to a support and suspending the fiber bundle vertically. The pitch T0 is, for example, 20.0, 22.0, 24.0, 26.0, 28.0, 30.0, 32.0, 34.0, 36.0, 38.0, or 40.0 mm, and may be within the range of any two of the values ​​exemplified here. The fiber bundle for hair ornaments according to the present invention has a pitch within the above numerical range, possesses an ideal shape, and excels at maintaining an ornamental shape. The pitch T0 can be measured specifically by the method described in the examples. The pitch T0 can be controlled by adjusting the manufacturing conditions of the fiber bundle for hair accessories, specifically by adjusting the type and amount of fibers contained in the fiber bundle, as well as the method of winding the fiber bundle in the spiral shape formation process.

[0073] The fiber bundle for hair ornaments according to one embodiment of the present invention preferably contains 250 to 2550 fibers per bundle. The number of fibers contained in one bundle of hair ornament fiber bundles is, for example, 250, 300, 350, 400, 450, 500, 550, 600, 650, 700, 750, 800, 850, 900, 950, 1000, 1050, 1100, 1150, 1200, 1250, 1300, 1350, 1400, 1450, and 1500. These numbers are 1550, 1600, 1650, 1700, 1750, 1800, 1850, 1900, 1950, 2000, 2050, 2100, 2150, 2200, 2250, 2300, 2350, 2400, 2450, 2500, and 2550, and may be within the range of any two of the numbers exemplified here.

[0074] Pitch T0 of the spiral shape, pitch T1 after 24 hours, pitch T2 after 72 hours, diameter, elongation rate E after 24 hours. 24 and the elongation rate E after 72 hours 72 Furthermore, the average hollowness ratio of the fibers contained in the fiber bundle for hair ornaments can be the same as in the first aspect.

[0075] 2.3 Method for manufacturing fiber bundles for hair ornaments and hair ornament products A method for manufacturing a fiber bundle for hair ornaments according to one embodiment of the present invention may include a spiral shape formation step, and the spiral shape formation step may be the same as in the first aspect. Furthermore, a hair ornament product according to one embodiment of the present invention includes a plurality of the above-mentioned fiber bundles for hair ornaments, and the hair ornament product can be the same as in the first aspect.

[0076] 3. Third perspective A fiber bundle for hair ornaments according to a third aspect of the present invention comprises 250 to 2550 fibers, the fiber bundle for hair ornaments comprises hollow fibers having a hollow portion extending in the longitudinal direction of the fiber, the average hollow portion of the fibers contained in the fiber bundle for hair ornaments is 10% or more when the area occupied by the hollow portion in a cross-section perpendicular to the longitudinal direction of the fiber is defined as the hollow ratio, the fiber bundle for hair ornaments has a spiral shape, and when one end of the fiber bundle for hair ornaments is fixed to a support and the fiber bundle for hair ornaments is suspended vertically, the pitch of the spiral shape immediately afterward is defined as T0, where T0 is 20.0 to 40.0 mm.

[0077] 3.1 Hollow Fibers A fiber bundle for hair ornaments according to one embodiment of the present invention includes hollow fibers having a hollow portion extending in the longitudinal direction of the fiber. The shape, composition, and manufacturing method of the hollow fibers according to the second aspect may be the same as in the first aspect.

[0078] A fiber bundle for hair ornaments according to one embodiment of the present invention contains 250 to 2550 fibers per bundle. The number of fibers contained in one bundle of hair ornament fiber bundles is, for example, 250, 300, 350, 400, 450, 500, 550, 600, 650, 700, 750, 800, 850, 900, 950, 1000, 1050, 1100, 1150, 1200, 1250, 1300, 1350, 1400, 1450, and 1500. These numbers are 1550, 1600, 1650, 1700, 1750, 1800, 1850, 1900, 1950, 2000, 2050, 2100, 2150, 2200, 2250, 2300, 2350, 2400, 2450, 2500, and 2550, and may be within the range of any two of the numbers exemplified here.

[0079] The fiber bundle for hair ornaments according to the present invention has an average hollowness ratio of 10% or more among the fibers contained in the fiber bundle for hair ornaments. The average hollowness ratio may be, for example, 10, 15, 20, 25, 30, 35, 40, 45, 50, or 55%, and may be within the range of any two of the values ​​exemplified herein. Furthermore, the fiber bundle for hair ornaments according to the present invention may contain solid fibers and / or human hair. In that case, it is preferable that the average hollowness of the fibers contained in the fiber bundle for hair ornaments falls within the above numerical range. The average hollowness ratio of the fibers contained in a fiber bundle for hair ornaments can be controlled by adjusting the hollowness ratio of each hollow fiber and the percentage of hollow fibers present.

[0080] The fiber bundle for hair ornaments according to one embodiment of the present invention has sufficient volume as a whole, and the total mass of the fiber bundle can be reduced to below a certain level, by keeping the average hollowness ratio and the number of strands per bundle within the above numerical range, and is excellent at maintaining a spiral shape.

[0081] The fiber bundle for hair ornaments according to the present invention has a spiral shape, which is as described in the first aspect. The fiber bundle for hair ornaments according to the present invention has a spiral pitch T0 of 20.0 to 40.0 mm immediately after fixing one end of the fiber bundle to a support and suspending the fiber bundle vertically. The pitch T0 is, for example, 20.0, 22.0, 24.0, 26.0, 28.0, 30.0, 32.0, 34.0, 36.0, 38.0, or 40.0 mm, and may be within the range of any two of the values ​​exemplified here. The fiber bundle for hair ornaments according to the present invention has a pitch within the above numerical range, possesses an ideal shape, and excels at maintaining an ornamental shape. The pitch T0 can be measured specifically by the method described in the examples. The pitch T0 can be controlled by adjusting the manufacturing conditions of the fiber bundle for hair accessories, specifically by adjusting the type and amount of fibers contained in the fiber bundle, as well as the method of winding the fiber bundle in the spiral shape formation process.

[0082] The mass of a bundle of fibers for hair ornaments according to one embodiment of the present invention can be 3.0 to 14.0 g per bundle. The mass of a bundle of fibers for hair ornaments can be, for example, 3.0, 3.5, 4.0, 4.5, 5.0, 5.5, 6.0, 6.5, 7.0, 7.5, 8.0, 8.5, 9.0, 9.5, 10.0, 10.5, 11.0, 11.5, 12.0, 12.5, 13.0, 13.5, or 14.0 g, and may be within the range of any two of the values ​​exemplified here.

[0083] Pitch T0 of the spiral shape, pitch T1 after 24 hours, pitch T2 after 72 hours, diameter, elongation rate E after 24 hours. 24 and the elongation rate E after 72 hours 72 Furthermore, the perimeter can be the same as in the first viewpoint.

[0084] 3.3 Method for manufacturing fiber bundles for hair ornaments and hair ornament products A method for manufacturing a fiber bundle for hair ornaments according to one embodiment of the present invention may include a spiral shape formation step, and the spiral shape formation step may be the same as in the first aspect. Furthermore, a hair ornament product according to one embodiment of the present invention includes a plurality of the above-mentioned fiber bundles for hair ornaments, and the hair ornament product can be the same as in the first aspect. [Examples]

[0085] The present invention will be described in more detail below based on examples, but the present invention is not limited to these examples.

[0086] (Example 1) <Spinning Process> 80 parts by mass of vinyl chloride resin (manufactured by Taiyo Vinyl Chloride Co., Ltd., product name: TH1000), 20% by mass of AS resin (vinyl copolymer resin with 68% by mass of styrene monomer units and 32% by mass of acrylonitrile monomer units (manufactured by Denka Co., Ltd., GR-AT-6S)), 5 parts by mass of additives such as plasticizers, stabilizers, and lubricants (specifically, 3 parts by mass of stabilizer composition, 1 part by mass of epoxidized soybean oil, 0.4 parts by mass of phosphorus-based chelating agent, and 0.6 parts by mass of polyethylene wax), and 0.5 parts by mass of carbon black were mixed in a blender. The blended material was kneaded using a φ40 mm single-screw extruder to obtain a resin composition in the form of spinning pellets. The obtained pellet-shaped resin composition was spun using a φ40 mm single-screw melt spinning machine with a nozzle having the opening surface shown in the schematic diagram of Figure 4A. The obtained fibers had the cross-sectional shape shown in the schematic diagram of Figure 4B.

[0087] The stabilizer composition used to obtain the resin composition has the following components and composition. • Hydrotalcite compound (Mg4Al2(OH)12CO3·3H2O) 72.6 parts by mass • Zinc stearate 13.1 parts by mass • Silica (Carplex® #80, manufactured by DSL. Japan Co., Ltd.) 2.2 parts by mass • Dibenzoylmethane 2.3 parts by mass • Dipentaerythritol 0.9 parts by mass • Polyvinyl chloride resin (manufactured by Taiyo Vinyl Chloride Co., Ltd., product name: TH1000) 8.9 parts by mass

[0088] Other additives used to obtain the resin composition are as follows: • Epoxy soybean oil: ADEKA Corporation's "ADEKA Sizer (registered trademark) O-130P" • Phosphorus-based chelating agent: "ADEKA Stab (registered trademark) 1030" manufactured by ADEKA Corporation. • Polyethylene wax: Manufactured by Mitsui Chemicals, Inc.

[0089] <Stretching process and heat treatment process> The obtained undrawn yarn was drawn at 100°C, and then annealed at 100°C to 200°C to obtain artificial hair fiber 1. The draw ratio was 3 times, and the relaxation rate during annealing was set to 0.5 to 3%. The relaxation rate during annealing is calculated as (rotation speed of the winding roller during annealing) / (rotation speed of the feed roller during annealing).

[0090] <Adhesion Process> A surface treatment agent A was applied to fiber bundles for artificial hair using a roll transfer method. The roll transfer conditions were as follows: the roll radius was 125 mm, the roll was immersed in a solution containing surface treatment agent A up to a height of 20 mm from the bottom end of the roll, and the roll rotation speed was 0.2 to 8 m / min. The amount of surface treatment agent A applied was 0.1% by mass relative to 100% by mass of the fiber.

[0091] The surface treatment agent A used contains the following components: Surface treatment agent A: • Oil content: Mineral oil (Mineral Oil manufactured by DKSH Japan Co., Ltd.) Nonionic surfactant: Polyoxyethylene alkyl ether ("Poly(oxyethylene) oleyl ether" manufactured by Nikko Chemicals Co., Ltd.) • Cationic surfactant: Quaternary ammonium salt type cationic surfactant (F-20, manufactured by Yoshimura Oil Chemical Co., Ltd.)

[0092] <Spiral shape formation process> The fibers were cut to a total length of 1300 mm, and 4 g of the cut fibers were taken to create fiber bundles. In Table 1, "total length of fiber bundle" refers to the length of the fibers before the spiral shape formation process. A 9mm diameter pipe was wrapped with the fibers so that the length X of the fiber bundle in the longitudinal direction of the pipe after wrapping was 560mm (see Figure 3). This was heated in an 85°C oven for 30 minutes, then removed from the pipe to obtain a spiral-shaped fiber bundle for hair ornaments.

[0093] (Examples 2-6, Comparative Examples 1-5) In the spinning process, the hollowness of the fibers was adjusted by changing the nozzle, and the content of polyvinyl chloride resin in the resin composition was adjusted by adjusting the raw material blending. In the spiral shape formation process, the number and length of the fibers to be separated and the method of setting the fiber bundles during spiral shape formation were changed. In addition, fiber bundles for hair ornaments according to Examples 2-6 and Comparative Examples 1-5 were prepared in the same manner as in Example 1.

[0094] <Observation of fiber cross-section and hollowness> After the heat treatment process, bundles of fibers cut to appropriate lengths were wrapped with vinyl tape. A fiber bundle for cross-sectional observation was then cut perpendicular to the longitudinal direction using a utility knife to create a fiber cross-section. A laser microscope was used to take cross-sectional photographs of the fibers at a magnification of 400x. From the obtained images, the area ratio of the hollow portion in the cross-section (hollow ratio) was measured. (Hollow ratio) = {(Area enclosed by inner surfaces) / (Area enclosed by outer surfaces)} × 100 The void ratio was calculated using a VK-X150 controller manufactured by Keyence Corporation. The void ratio was the average value for N(50). In all examples and comparative examples, voids were present in all fibers.

[0095] <Circumference of fiber bundles for hair ornaments> The circumference of the obtained fiber bundles for hair ornaments was measured. The circumference was defined as the minimum circumference when the bundles were bundled so that the cross-section was approximately circular.

[0096] <Pitch T0, T1, T2, diameter, and elongation ratio of the spiral shape> One end of the obtained hair accessory fiber bundle was fixed to a support with a clip, and the pitch and diameter of the spiral shape were measured immediately after the hair accessory fiber bundle was suspended vertically (see Figure 2). The measurement was performed within 5 minutes of suspending the hair accessory fiber bundle vertically.

[0097] Furthermore, the pitch T1 was measured 24 hours after the fiber bundles for hair ornaments were suspended vertically, and the pitch T2 was measured 72 hours later. The spiral pitch T0, T1, T2, and diameter were calculated using the average values ​​of the 2nd to 11th turns of the spiral (N=10) when suspended vertically. Furthermore, based on the following formula, the elongation rate E after 24 hours 24 and the elongation rate E after 72 hours 72 The result was calculated. E 24 =(T1-T0) / T0×100···(1) E 72 =(T2-T0) / T0×100···(2)

[0098] <Appearance evaluation after installation> Ten bundles of hair ornament fiber were tied to a support, suspended vertically, and their appearance was evaluated immediately after attachment and three days later. The appearance was assessed visually by ten hair ornament processing technicians (with five or more years of practical experience) to determine whether the bundles were acceptable as hair ornament fiber bundles, considering whether the volume of the bundles was sufficient, whether the spiral shape was appropriate, and whether the total length was appropriate, and evaluated according to the following criteria. ○: Evaluated as acceptable by 9 or more engineers. △: Six to eight engineers rated it as acceptable. ×: Fewer than 5 engineers deemed it acceptable.

[0099] [Table 1] [Explanation of Symbols]

[0100] 100 Cross-section of hollow fiber 11 Exterior 12. Inner self 13 Joint 14 Joint surface 15 Hollow part 16 Inner protrusion 17 Outer protrusion 200 Fiber bundles for hair accessories 21 Support 300 fiber bundles 31. Pipe (Jig) 200 nozzle holes 21 Nozzle hole outer surface 22 Inner surface of nozzle hole 23 Separation part 24 Inner protrusion of nozzle hole 25 Outer protrusion of nozzle hole 400 nozzle holes 41 Nozzle hole outer surface 42 Inner surface of nozzle hole 43 Separation part 44 Inner protrusion of nozzle hole

Claims

1. A fiber bundle for hair ornaments containing 250 to 2550 fibers, The aforementioned fiber bundle for hair ornaments includes hollow fibers having hollow portions extending in the longitudinal direction of the fibers, The mass of the aforementioned fiber bundle for hair ornaments is 3.0 to 14.0 g. The aforementioned fiber bundle for hair ornaments has a spiral shape, The pitch of the spiral shape immediately after fixing one end of the fiber bundle for the hair ornament to a support and suspending the fiber bundle for the hair ornament vertically is T ０ In that case, T ０ A fiber bundle for hair ornaments, with a length of 20.0 to 40.0 mm.

2. A fiber bundle for hair ornaments containing multiple fibers, The aforementioned fiber bundle for hair ornaments includes hollow fibers having hollow portions extending in the longitudinal direction of the fibers, The circumference of the aforementioned fiber bundle for hair ornaments is 32 to 56 mm. The mass of the aforementioned fiber bundle for hair ornaments is 3.0 to 14.0 g. The aforementioned fiber bundle for hair ornaments has a spiral shape, The pitch of the spiral shape immediately after fixing one end of the fiber bundle for the hair ornament to a support and suspending the fiber bundle for the hair ornament vertically is T ０ In that case, T ０ A fiber bundle for hair ornaments, with a length of 20.0 to 40.0 mm.

3. A fiber bundle for hair ornaments containing 250 to 2550 fibers, The aforementioned fiber bundle for hair ornaments includes hollow fibers having hollow portions extending in the longitudinal direction of the fibers, When the area occupied by the hollow portion in a cross-section perpendicular to the longitudinal direction of the fiber is defined as the hollow ratio, the average hollow ratio of the fibers included in the hair accessory fiber bundle is 10% or more. The aforementioned fiber bundle for hair ornaments has a spiral shape, The pitch of the spiral shape immediately after fixing one end of the fiber bundle for the hair ornament to a support and suspending the fiber bundle for the hair ornament vertically is T ０ In that case, T ０ A fiber bundle for hair ornaments, with a length of 20.0 to 40.0 mm.

4. A fiber bundle for hair ornaments according to claim 1 or claim 2, The hollow fiber is a fiber bundle for hair ornaments, wherein the hollow ratio is 10% or more, when the area occupied by the hollow portion in a cross-section perpendicular to the longitudinal direction of the fiber is defined as the hollow ratio.

5. A fiber bundle for hair ornaments according to any one of claims 1 to 3, A fiber bundle for hair ornaments, wherein one end of the fiber bundle for hair ornaments is fixed to a support, and when the fiber bundle for hair ornaments is suspended vertically, the diameter of the spiral shape is 14.0 to 22.0 mm.

6. A fiber bundle for hair ornaments according to any one of claims 1 to 3, The pitch of the spiral shape 24 hours after the aforementioned fiber bundle for hair ornaments is suspended vertically is T １ In this case, the 24-hour elongation rate E is expressed by the following formula (1). ２４ A fiber bundle for hair ornaments, having a content of 2.0% or less. E ２４ =(T １ -T ０ ) / T ０ ×100・・・(1)

7. A fiber bundle according to any one of claims 1 to 3, The pitch of the spiral shape 72 hours after the aforementioned fiber bundle for hair ornaments has been suspended vertically is T ２ In this case, the elongation rate after 72 hours E is expressed by the following formula (2) ７２ A fiber bundle for hair ornaments, having a content of 3.5% or less. E ７２ =(T ２ -T ０ ) / T ０ ×100・・・(2)

8. A fiber bundle for hair ornaments according to any one of claims 1 to 3, A fiber bundle for hair ornaments, wherein the fiber is made of a resin composition comprising at least one selected from the group consisting of vinyl chloride resin, vinyl chloride-acrylonitrile copolymer, polyester resin, polyamide resin, polypropylene resin, polyethylene resin, polyacrylonitrile resin, and acrylonitrile-styrene copolymer.

9. A hair ornament product comprising a plurality of fiber bundles for hair ornaments as described in any one of claims 1 to 3.

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