Method for decoloring artificial hair, method for making restoration hair, method for restoring hair, and method for making wig

Abstract

To provide a method for decoloring artificial hair, capable of decoloring a part of the artificial hair to make the artificial hair inconspicuous in knots when attached to the head of a person.SOLUTION: A method for decoloring artificial hair comprises an application step of applying a decoloring agent to a part of the artificial hair dyed using a disperse dye, and a heating step of applying heat to the artificial hair after the application step or at the same time as the application step to decolorize the part of the artificial hair. The decoloring agent contains at least one compound selected from the compounds represented by the following general formula (1): R1OOC-X-COOR2 and general formula (2): R3COO-(AO)n-Y1, where X is a 2-4C alkylene group or alkenylene group, R1 is a 1-4C alkyl group, R2 is a 1-4C alkyl group, AO is a 2-3C alkyleneoxy group, n is an integer of 1 to 3, R3 is a 1-4C alkyl group, Y1 is hydrogen or a R4CO group, and R4 is a 1-4C alkyl group.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a method for bleaching artificial hair, a method for producing hair for hair growth, a method for hair growth, and a method for producing a wig. [Background technology]

[0002] Conventionally, wigs have been made by tying human hair or artificial hair to a wig base. For example, Patent Document 1 discloses a wig in which human hair or artificial hair is planted on the wig base.

[0003] When making a wig in this way, the knots of the hair turn into black hairballs, and when the wig is worn, the hairballs at the knots stand out through the gaps in the hair. For this reason, in Patent Document 1, the roots of the hair planted on the wig base are colored in an inconspicuous color.

[0004] Patent Document 1 discloses the following method for making the roots of hair planted in a wig an inconspicuous color. In the case of human hair, the entire hair is completely bleached in advance, or bleached until it is almost the same color as the wig base, and then planted in the wig base, and then the hair is dyed the user's hair color except for the roots. In the case of artificial hair (also called artificial hair), the hair is bundled in advance and dyed with a dye on one side at a time.

[0005] Hair augmentation is also known as a common measure against thinning hair. Hair augmentation is a procedure in which artificial hair or human hair is attached to the natural hair growing from the head. Usually, artificial hair or human hair is dyed black before use, which causes a problem that the knots are black and noticeable when attached to the natural hair.

[0006] In response to this, Patent Document 2 discloses hair for hair addition in which a skin-colored or light-colored area close to skin color is provided at the portion where the knot is to be formed. According to Patent Document 2, by making the knot of the hair for hair addition skin-colored or light-colored close to skin color, the knot with the natural hair is not noticeable. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] Japanese Utility Model Application Publication No. 2-90619 [Patent Document 2] JP 2003-41417 A Summary of the Invention [Problem to be solved by the invention]

[0008] In Patent Document 1, the artificial hair is bundled and dyed with dye on each side at a time, resulting in inferior quality. In such a method, for example, the application of dye may vary between the artificial hairs, resulting in uneven coloring of the hair. In addition, in such a method, the size of the inconspicuous colored part (camouflage part) in the root area may vary. Patent Document 1 does not disclose the idea of ​​bleaching part of the artificial hair to create the camouflage part. The technology of bleaching part of the artificial hair is highly difficult, and Patent Document 1 does not consider bleaching the part that will become the knot.

[0009] Patent Document 2 describes a method of bleaching fibers dyed in a desired color such as black or brown to a skin color, but does not disclose a specific method for bleaching. Patent Document 2 only describes that the bleaching method can be performed by either the well-known oxidation method or reduction method. However, even if such a method is used, it is very difficult to bleach a portion of the hair for hair growth as intended.

[0010] Therefore, an object of the present invention is to provide a method for bleaching artificial hair, which can bleach a part of the artificial hair and produce artificial hair whose knots are not noticeable when used on a person's head. [Means for solving the problem]

[0011] In order to achieve the above object, the method for bleaching artificial hair of the present invention comprises an application step of applying a bleaching agent to a portion of artificial hair dyed with a disperse dye, and a heating step of applying heat to the artificial hair after or simultaneously with the application step to bleach the portion of the artificial hair, wherein the bleaching agent contains at least one compound selected from the following general formula (1) and the following general formula (2).

[0012] Furthermore, the method for producing hair for hair growth of the present invention comprises an application step of applying a bleaching agent to a portion of artificial hair dyed with a disperse dye, a heating step of applying heat to the artificial hair after or simultaneously with the application step to bleach a portion of the artificial hair, and a first annular portion forming step of forming a ring-shaped portion of variable size in the bleached portion of the artificial hair after the heating step, wherein the bleaching agent contains at least one compound selected from the following general formula (1) and the following general formula (2):

[0013] The hair growth method and wig production method of the present invention are characterized in that they use artificial hair bleached by the artificial hair bleaching method of the present invention.

[0014] General formula (1) and general formula (2) are as follows. R 1 OOC-X-COOR 2 (1) R 3 COO-(AO)nY 1 (2) In the general formula (1), X is an alkylene group or alkenylene group having 2 to 4 carbon atoms, and R 1 is an alkyl group having 1 to 4 carbon atoms, and R 2 is an alkyl group having 1 to 4 carbon atoms, and in the general formula (2), AO is an alkyleneoxy group having 2 to 3 carbon atoms, n is an integer of 1 to 3, and R 3 is an alkyl group having 1 to 4 carbon atoms, and Y 1 is a hydrogen atom or R 4 CO group, R 4 is an alkyl group having 1 to 4 carbon atoms. Effect of the Invention

[0015] According to the present invention, it is possible to bleach a part of the artificial hair, and to produce artificial hair in which knots are not noticeable when used on a person's head. The artificial hair bleached according to the present invention can be used for hair growth, hair growth methods, wigs, etc., and the knots are not noticeable when used on a person's head. [Brief description of the drawings]

[0016] [Figure 1] FIG. 2A is a diagram illustrating an example of applying a bleaching agent to artificial hair, and FIG. 2B is a diagram illustrating an example of artificial hair after bleaching. [Diagram 2] 1A to 1E are diagrams for explaining an example of applying a bleaching agent to artificial hair and an example of the artificial hair after bleaching. [Figure 3A] 1A and 1B are diagrams for explaining another example of applying a bleaching agent to artificial hair. [Figure 3B] 10A to 10D are diagrams illustrating another example of applying a bleaching agent to artificial hair. [Figure 4] Illustrates (A) and (B) an example of unbleached hair for hair growth. [Diagram 5] 1A and 1B are diagrams illustrating an example of bleached hair for hair growth. [Figure 6] 1A and 1B are diagrams illustrating an example of a hair growth method using unbleached hair for hair growth. [Figure 7] 1A and 1B are diagrams illustrating an example of a hair growth method using bleached hair for hair growth. [Figure 8] 10A to 10C are diagrams illustrating another example of applying a bleaching agent to artificial hair. [Figure 9] 1A and 1B are diagrams illustrating an example in which a transfer material is used. [Figure 10] 1A and 1B are diagrams illustrating an example in which a shielding member is used. [Figure 11] 1A and 1B are diagrams illustrating an example of a jig used in an example of a heating step. [Figure 12] 12A to 12C are diagrams illustrating an example of heating using the jig in FIG. 11. [Figure 13] 11(A) and 11(B) are perspective schematic views of FIG. [Figure 14] 13A and 13B are diagrams illustrating another example in which a jig is used. [Figure 15] 1A and 1B are diagrams illustrating an example of a hair augmentation method using bleached artificial hair. [Figure 16] 1A and 1B are diagrams showing examples of artificial hair tied to a wig base. (A) is an example of bleached artificial hair, and (B) is an example of unbleached artificial hair. [Figure 17] 1A and 1B are diagrams showing an example of multiple artificial hairs tied to a wig base. (A) is an example of bleached artificial hairs tied to the base, and (B) is an example of unbleached artificial hairs tied to the base. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0017] The method for bleaching artificial hair, the method for producing hair for hair growth, the method for hair growth, and the method for producing a wig according to the present invention will be described below with reference to the drawings. Note that the present invention is not limited to the following embodiments, and may be modified within the scope of what a person skilled in the art can imagine, such as other embodiments, additions, modifications, and deletions, and any embodiment is within the scope of the present invention as long as it achieves the functions and effects of the present invention.

[0018] (How to bleach artificial hair) The method for bleaching artificial hair of the present invention comprises an application step of applying a bleaching agent to a portion of artificial hair dyed with a disperse dye, and a heating step of applying heat to the artificial hair after or simultaneously with the application step to bleach the portion of the artificial hair, the bleaching agent containing at least one compound selected from the following general formula (1) and the following general formula (2). According to the present invention, it is possible to bleach a portion of the artificial hair, and to obtain artificial hair in which knots are not noticeable when used on a person's head. Hereinafter, an embodiment of the method for bleaching artificial hair of the present invention will be described.

[0019] <Application process> The application step is a step of applying a bleaching agent to a part of the artificial hair dyed with a disperse dye. The application method is not limited to one, but a plurality of methods are possible, as described below.

[0020] <Artificial hair> The material of the artificial hair is not particularly limited and can be appropriately selected. For example, polyvinyl chloride fiber, polyester fiber, acrylic fiber, polyamide fiber, etc. are listed. Among these, polyester fiber is preferable.

[0021] The artificial hair to be bleached is dyed with a disperse dye. The dyeing method is not limited. Known dyeing methods can be mentioned. For example, disperse dyes are dyed on the artificial hair in the form of a textile printing ink or sublimation transfer ink containing the disperse dye. In addition, the artificial hair may be dyed by immersion dyeing or textile printing. For example, fibers in a skein may be dyed using a dedicated dyeing kettle (normal pressure or high pressure). The dyed area can be selected appropriately, but considering that the artificial hair will be used on a human head, it is assumed that the entire artificial hair is dyed.

[0022] <Disperse dye> The disperse dye is not particularly limited and can be appropriately selected. Examples of the disperse dye include azo disperse dyes and anthraquinone disperse dyes. Examples of the disperse dye include compounds classified as CI Disperse Black, CI Disperse Blue, CI Disperse Red, CI Disperse Orange, CI Disperse Yellow, CI Disperse Green, CI Disperse Violet, and CI Disperse Brown. When Japanese people use artificial hair, it is expected that disperse dyes that exhibit black or brown colors will be used, but the colors are not limited to these colors.

[0023] <Bleaching agent> In this embodiment, the bleaching process refers to removing the disperse dye from the artificial hair dyed with the disperse dye. It is sufficient that the disperse dye in the artificial hair can be moved by the heating process described below, and it is not essential that the hair is completely bleached. Therefore, although the bleaching process refers to a bleaching agent in this embodiment, the bleaching process also includes the fading of the color of the part dyed with the disperse dye. The bleaching agent may simply be called a processing agent.

[0024] The bleaching agent used in the present embodiment contains at least one compound selected from the following general formula (1) and the following general formula (2). By using such a compound, the bleaching effect of the artificial hair is improved. R 1 OOC-X-COOR 2 (1) R 3 COO-(AO)nY 1 (2)

[0025] In the general formula (1), X is an alkylene group or alkenylene group having 2 to 4 carbon atoms, and R 1is an alkyl group having 1 to 4 carbon atoms, and R 2 is an alkyl group having 1 to 4 carbon atoms. The alkylene group represented by X may be either linear or branched, but when it is linear, a higher bleaching effect is likely to be exhibited. In the general formula (2), AO is an alkyleneoxy group having 2 to 3 carbon atoms, n is an integer of 1 to 3, and R 3 is an alkyl group having 1 to 4 carbon atoms, and Y 1 is a hydrogen atom or R 4 CO group, R 4 is an alkyl group having 1 to 4 carbon atoms.

[0026] The compound represented by the above general formula (1) has a chemical structure corresponding to a dibasic acid diester. Specific examples of compounds having such a chemical structure include dimethyl succinate, diethyl succinate, dimethyl glutarate, diethyl glutarate, dimethyl adipate, diethyl adipate, dimethyl 2-methylglutarate, diethyl 2-methylglutarate, dimethyl maleate, diethyl maleate, etc. When the compound represented by the above general formula (1) is at least one selected from dimethyl succinate, dimethyl glutarate, and dimethyl adipate, a higher decolorizing effect is exhibited.

[0027] In the above general formula (2), AO is an alkyleneoxy group having 2 to 3 carbon atoms, and n is an integer of 1 to 3. In particular, when AO is an ethyleneoxy group or when n is small, a higher bleaching effect is likely to be exhibited.

[0028] In the above general formula (2), R 3 is an alkyl group having 1 to 4 carbon atoms, and Y 1 is a hydrogen atom or R 4 CO group, R 4 is an alkyl group having 1 to 4 carbon atoms. 3 is an alkyl group having 1 or 2 carbon atoms, and R 4 When R is an alkyl group having 1 or 2 carbon atoms, a higher decolorizing effect is likely to be exhibited. 3 and R 4may be the same group or different groups.

[0029] Specific examples of the compound represented by the above general formula (2) include ethylene glycol diacetate, di- or tri-ethylene glycol diacetate, propylene glycol diacetate, di- or tripropylene glycol diacetate, and the like.

[0030] The bleaching agent may consist of only the compound represented by the general formula (1) or (2), or may contain other components in addition to the compound. Examples of other components include water and other additives. When water and other additives are contained, the concentration of the compound represented by the general formula (1) or (2) is preferably 95% by mass or more.

[0031] <Method of applying the decolorizing agent in the application step> The method of applying the bleaching agent in the application step can be appropriately selected. For example, the bleaching agent may be applied to the artificial hair using a processing agent application member, or the artificial hair may be immersed in the bleaching agent. The bleaching agent may be applied to the artificial hair in a bundled state, or to each individual strand, or to a hair sheet holding a plurality of artificial hairs. The bleaching agent may be applied to the artificial hair in a linear or thread-like state, or the artificial hair may be formed into a ring-shaped portion to turn it into hair for hair growth, and then the bleaching agent may be applied.

[0032] The application step may be performed on one strand of artificial hair, or on multiple strands of artificial hair at the same time. When the bleaching agent is applied to multiple strands of artificial hair at the same time, productivity can be improved. When the bleaching agent is applied to multiple strands of artificial hair at the same time, gaps between the strands of artificial hair can be provided to reduce the situation where the bleaching agent is not applied to the desired location. By forming the artificial hair into a hair sheet, it is easier to provide such gaps.

[0033] <<Method 1>> The application step will be described below with reference to several examples. Method 1 is a method that assumes that the bleaching agent is applied to the artificial hair when no ring portion is formed. In method 1, the agent is applied to the artificial hair in a linear or thread-like state. For example, the agent is applied to the artificial hair when one end and the other end are fixed with any jig. This makes it easier to apply the agent to the targeted area.

[0034] When fixing with a jig, for example, a method of attaching a plurality of artificial hairs to a sheet member can be mentioned. Such a product is also called a hair sheet or an artificial hair sheet.

[0035] A diagram for explaining Method 1 is shown in Fig. 1. The illustrated example is an example in which a bleaching agent is applied to a hair sheet 30. Fig. 1(A) is a diagram showing the hair sheet 30 in a state before the bleaching agent is applied. In the illustrated hair sheet 30, a plurality of artificial hairs 10 are fixed to a support member 31 by a fixing member 33.

[0036] The fixing member 33 can be appropriately selected, and may be, for example, a tape. In addition, a clamping member that clamps and fixes the artificial hair 10 and the supporting member 31 may be used.

[0037] The method for fixing the artificial hair can be appropriately selected, and a fixing member 33 may be used, or an adhesive may be used. When an adhesive is used, it is preferable to make the artificial hair removable from the support member, but the artificial hair may be removed from the support member by cutting it after bleaching.

[0038] The support member 31 can be appropriately selected, and examples thereof include paper, resin, etc. In the illustrated example, an opening 32 is provided in the support member 31 to facilitate application of the bleaching agent. By providing the opening 32, for example, an operation such as applying the bleaching agent from one side and then applying the bleaching agent from the opposite side can be performed.

[0039] When the application step is performed on a hair sheet 30 using a support member 31 as shown in the figure, the heating step can be performed directly after the application step, improving work efficiency. Also, when the heating step is performed on a hair sheet 30 using a support member 31 with an opening 32 as shown in the figure, the support member 31 has the effect of blocking heat from being applied to the artificial hair 10 when the artificial hair 10 is heated. In this case, the minimum necessary parts of the artificial hair 10 can be heated, improving quality.

[0040] In the application step, the bleaching agent may be applied to one hair sheet 30, or multiple hair sheets 30 may be stacked to apply the bleaching agent. When a single hair sheet is used, it is easier to apply the bleaching agent to the desired location. When multiple hair sheets are stacked, productivity is improved. The density of the artificial hairs in the hair sheet can be appropriately selected. It is preferable that adjacent artificial hairs are not in contact with each other.

[0041] Fig. 1(B) is a diagram showing the state after a bleaching agent is applied to the artificial hair 10 of the hair sheet 30 in Fig. 1(A) and a heating process is performed. As shown in the figure, the part where the bleaching agent is applied and heated is bleached.

[0042] Additional explanations regarding the symbols in Fig. 1 will be given. The artificial hair in an unbleached state is referred to as artificial hair 10. The artificial hair 10 can also be said to be the artificial hair before bleaching. The artificial hair after bleaching is referred to as artificial hair 12. In the artificial hair 12, the symbol 11 is the bleached part of the artificial hair 12, and the symbol 13 is the unbleached part of the artificial hair 12.

[0043] In the application step in this embodiment, the bleaching agent is applied to a part of the artificial hair. The location where the bleaching agent is applied can be selected appropriately. For example, it is preferable to apply the bleaching agent when the artificial hairs 10 are arranged with gaps provided, or when the artificial hairs 10 are bundled. In this case, productivity is improved.

[0044] An example of the state in which the artificial hair 10 is arranged with gaps is the state shown in Fig. 1. An example of the state in which the artificial hair 10 is arranged with gaps is a state in which the artificial hair is linear, and the state in which the artificial hair is linear is not limited to a strictly linear state, but includes a substantially linear state. An example of the state in which the artificial hair is linear is a state in which both ends of the artificial hair 10 are fixed, as in the example shown in Fig. 1. In addition to this, both ends or one end of the artificial hair 10 may be pulled.

[0045] Applying the bleaching agent to the artificial hair in a straight line makes it easier to apply the bleaching agent to the desired location. To straighten the artificial hair, for example, both ends of the artificial hair may be fixed, or a force may be applied in the direction of both ends to stretch the artificial hair. An example of the state in which the artificial hair 10 is bundled is the state shown in FIG. 3B, which will be described later.

[0046] The portion to which the bleaching agent is applied and the portion to be bleached are not particularly limited and can be selected appropriately. For example, the bleaching agent is applied to the center of the straight artificial hair 10 to bleach the center portion. In this case, the portion to which the bleaching agent is applied and bleached is more likely to be knotted when used on a person's head or as a wig.

[0047] The artificial hair 12 thus obtained can be used for various purposes. For example, it can be tied to one's own hair (for example, Fig. 7 and Fig. 11 described later), tied to a wig base (for example, Fig. 12 described later), or formed with a ring-shaped part in the center to be used as hair extension hair (for example, Fig. 5 described later).

[0048] In this embodiment, although not particularly limited, when using the artificial hair 12 after the heating step for bleaching, it is preferable that the center of the artificial hair 12 is bleached. In this case, the hair-thickening effect is improved. On the other hand, if the end side of the artificial hair 10 is bleached to create the artificial hair 12, when the artificial hair 12 is tied to the natural hair, the end side becomes a knot, and one artificial hair is used to create one additional hair, resulting in a poor hair-thickening effect.

[0049] In method 1, the method of applying the bleaching agent to the artificial hair can be selected as appropriate. For example, a method using a processing agent application member can be mentioned. In this way, by using the processing agent application member, it becomes easier to apply the bleaching agent to the desired location of the artificial hair. Also, if the bleaching agent spreads too much on the artificial hair, the bleached area may spread and the desired quality may not be achieved, but by using such a processing agent application member, it becomes easier to apply the bleaching agent to the desired location.

[0050] Considering the above, it is preferable that the application step is performed by holding the bleaching agent on a processing agent application member and contacting the processing agent application member with a part of the artificial hair. This makes it easier to apply the bleaching agent to a target part, and allows the bleaching part to be appropriately selected depending on the application. As described above, an example of the contact part is the center part of the straight artificial hair 10.

[0051] The processing agent application member may be appropriately selected as long as it can hold the bleaching agent and apply the bleaching agent. Examples include string-shaped members, tape-shaped members, brush-shaped members (e.g., brushes), spray members, dripping members, etc. Among these, string-shaped members and tape-shaped members are preferred because they can stably apply the bleaching agent.

[0052] Examples of string-like members (also called string-like members) include those made of thread, cloth, paper, cellulosic fibers, etc. For example, a cord (which may be called paper cord, etc.) made by twisting thin pieces of paper into a string shape can be used as the string-like member. The string-like member may also be made of cellulosic fibers.

[0053] The tape-like member may be a long, narrow strip-like member, and may be made of, for example, paper or cellulosic fibers. The tape-like member may be made, for example, by cutting filter paper, paper towels, etc.

[0054] When the processing agent application member is a string-like or tape-like member, when applying the bleaching agent to a hair sheet or a bundle of artificial hairs, the bleaching agent can be applied to multiple artificial hairs at the same time and at the same position on multiple artificial hairs, thereby improving productivity and quality.

[0055] The processing agent applying member may also serve as a transfer receiving material, which will be described later. In this case, the bleaching step may be carried out while the processing agent applying member is kept in contact with the artificial hair.

[0056] An example of the application process using a string-shaped processing agent application member will be described with reference to Figure 2. Here, an example will be described in which a paper string is used as the string-shaped processing agent application member and the processing agent is applied to the hair sheet. Note that a tape-shaped member can also be used in the same way.

[0057] (A) is a schematic diagram of the main part of the artificial hair 10 in the hair sheet. As shown in (B) and (C), a strand 36 holding a bleaching agent 50 is brought into contact with the artificial hair 10. Here, as an example, the strand 36 is brought into contact with the center of the artificial hair 10. As shown in (D), the bleaching agent 50 is applied to the artificial hair 10. After this, a heating process is performed, and the center of the artificial hair 10 is bleached as shown in (E).

[0058] The method of retaining the bleaching agent on the cord 36 can be selected as appropriate. For example, as shown in (C), the cord 36 can be immersed in a storage section 51 that stores the bleaching agent 50. When immersing the cord 36 in the bleaching agent 50 in this manner, it is preferable to absorb excess agent 50 from the cord 36, although this depends on the material of the cord 36 and the type of bleaching agent 50. If the cord 36 retains too much bleaching agent 50, too much bleaching agent 50 will be applied to the artificial hair 10, which may cause the bleached area to spread.

[0059] The amount of the bleaching agent applied is not particularly limited and can be appropriately selected. By adjusting the amount of the bleaching agent applied, the range of bleaching can be adjusted. The number of times the bleaching agent is applied is not particularly limited, and it may be applied once or multiple times.

[0060] 3A(A) and (B) are schematic cross-sectional views and schematic side views for explaining supplementary information on Method 1. When applying the bleaching agent to the center of the artificial hair 10, for example, the artificial hair 10 may be supported by a support base 34 to raise the height of the desired portion. In this way, it becomes easier to apply the bleaching agent to the desired portion.

[0061] Fig. 3B is a schematic diagram for explaining a supplement to Method 1. The example shown in Fig. 1 etc. is an example in which a bleaching agent is applied to a hair sheet, but this embodiment is not limited to this. For example, as shown in Fig. 3B(A) and (B), the bleaching agent may be applied to the artificial hair 10 in a bundled state. In this case, the heating step may be performed with the artificial hair 10 in a bundled state, or the heating step may be performed after releasing the bundled state.

[0062] Also, as shown in Figures 3B(C) and (D), the artificial hair 10 may be bound in a skein (which may also be called a loop) and the bleaching agent applied thereto. In this case, one strand of artificial hair 10 may be looped, or multiple strands of artificial hair 10 may be looped. Also, the heating step may be carried out in the state shown in Figure 3B(C), or the artificial hair 10 may be cut or otherwise treated before the heating step. From the viewpoint of workability, etc., when the bleaching agent application step is carried out while the artificial hair 10 is bound in a loop, it is preferable to carry out the heating step in the state shown in Figure 3B(C) to bleach the artificial hair 12, and then cut the artificial hair 12 according to the purpose.

[0063] The application of the bleaching agent in method 1 will be explained again. In method 1, when the bleaching agent is applied to the artificial hair 10, the artificial hair 10 may be in the form of a hair sheet (FIG. 1, etc.), and the example shown in FIG. 1 can be said to be in a state in which the artificial hair 10 is arranged with gaps provided. In addition, in method 1, when the bleaching agent is applied to the artificial hair 10, the artificial hair 10 may be in a state in which it is bundled in one direction (FIG. 3B(A)), or in a state in which it is bundled in a loop (FIG. 3B(C)). When the application step is performed with the artificial hair 10 bundled, there may be gaps between the artificial hairs 10.

[0064] In view of the above, in the application step in this embodiment, it is preferable to apply the bleaching agent to the artificial hairs arranged with gaps therebetween or to the artificial hairs bundled together. In this case, productivity is improved.

[0065] <<Method 2>> Next, method 2, which is a method other than method 1 in the application step, will be described. In method 2, the artificial hair is immersed in the processing agent. In method 2, the application step is carried out, for example, in a state in which a ring portion is formed on the artificial hair.

[0066] In the application step in method 2, the artificial hair is immersed in the bleaching agent. The method of immersion is not particularly limited, and for example, the bleaching agent is stored in a storage section such as a container, and the artificial hair is immersed in the storage section. The immersion time is not particularly limited and can be selected appropriately. In the case of immersion method 2, it is easier to apply the bleaching agent to the non-linear or non-filamentous parts of the artificial hair. For example, when a ring-shaped part or the like is formed in the artificial hair and it is desired to bleach the ring-shaped part or the like, it is easier to apply the bleaching agent compared to method 1, and uneven bleaching can be further reduced.

[0067] In this embodiment, the annular portion is a portion formed by a part of the artificial hair, and is a portion whose size is variable. In this embodiment, the artificial hair having the annular portion formed thereon is referred to as hair for hair growth.

[0068] An example of the annular portion will be described with reference to FIGS. FIG. 4 is a diagram for explaining an example of unbleached hair for hair addition 14. FIG. 4(A) is an example of hair for hair addition made from one artificial hair, and FIG. 4(B) is an example of hair for hair addition made from two artificial hairs. FIG. 5 is a diagram for explaining an example of bleached hair for hair addition 16. FIG. 5(A) is an example of hair for hair addition made from one artificial hair, and FIG. 5(B) is an example of hair for hair addition made from two artificial hairs.

[0069] In this embodiment, the hair for hair addition is obtained, for example, by forming an annular portion 18 in the center of the artificial hair. As a result, two straight portions 19 are formed from one artificial hair. The straight portions 19 are the portions that are visually recognized as the user's hair when the hair for hair addition is used on a person's hair. The size of the annular portion 18 is variable, and for example, pulling the straight portion 19 reduces the size of the ring. By using such hair for hair addition on a person's head, etc., a hair addition effect can be obtained.

[0070] As shown in the figure, one hair for hair addition may be made of one artificial hair or may be made of multiple artificial hairs. From the viewpoint of making the hair for hair addition and the viewpoint of using the hair for hair addition, it is preferable that one hair for hair addition is made of two artificial hairs.

[0071] In the figure, the unbleached hair for hair addition is indicated by reference numeral 14, and the bleached hair for hair addition is indicated by reference numeral 16. The bleached portion of the bleached hair for hair addition 16 is indicated by reference numeral 15. In FIG. 5, the bleached portion 15 is indicated by a dashed line for the purpose of explanation.

[0072] 6 and 7 are diagrams for explaining an example of the use of hair for hair addition having a ring-shaped portion. Fig. 6 is a diagram showing an example of the use of non-bleached hair for hair addition 14, and Fig. 7 is a diagram showing an example of the use of bleached hair for hair addition 16.

[0073] As shown in Fig. 6(A), for example, the annular portion 18 is passed through the natural hair 40, and the straight portion 19 is pulled in the direction of the arrow. This causes the annular portion 18 to close as shown in (B), and the hair for hair addition 14 is knotted to the natural hair 40. At this time, a knot 21 of the hair for hair addition is formed. The same applies to Fig. 7.

[0074] In the example shown in Fig. 6, since non-bleached hair for hair addition 14 is used, the knot 21 is visually recognized as, for example, a black lump (black lump). On the other hand, in the example shown in Fig. 7, since hair for hair addition 16 with bleached annular portion 18 is used, the bleached portion 15 becomes the knot 21, and the knot 21 becomes difficult to visually recognize.

[0075] 8 is a diagram for explaining an example of the application process in method 2. In (A), hair for hair growth 14 having an annular portion 18 is shown. As shown in (B), the annular portion 18 of the hair for hair growth 14 is immersed in a bleaching agent 50. In (C), hair for hair growth 16 after a heating process is shown, in which the annular portion 18 is bleached. In this way, the bleaching agent 50 can be applied evenly to the annular portion 18.

[0076] When immersing in the bleaching agent 50, for example, the hair for hair addition 14 may be immersed in the bleaching agent while one end of the straight portion 19 of the hair for hair addition 14 is held by a jig or the like. Alternatively, for example, a rod-shaped member may be passed through the annular portion 18, and the rod-shaped member may be immersed in the bleaching agent. In this case, productivity can be improved. Also, as in the example shown in the figure, by immersing multiple hair for hair addition in the bleaching agent at the same time, work efficiency can be improved.

[0077] <Heating process> The heating step is a step of applying heat to the artificial hair after or simultaneously with the application step to bleach a part of the artificial hair. The heating step may be a step of heating the hair for hair growth in which a ring part is formed in the artificial hair. In the following description, the artificial hair is mainly described, but the contents of the description are similarly applied to the hair for hair growth.

[0078] By heating the artificial hair to which the bleaching agent has been applied, the disperse dye in the portion to which the bleaching agent has been applied is separated from the artificial hair, and a portion of the artificial hair is bleached. The heating process may be referred to as a bleaching process or the like.

[0079] The phrase "heating after the application step or simultaneously with the application step" means that the heating step is not carried out before the application step. Although there is no particular limitation, for example, when the bleaching agent is applied to the artificial hair by the above-mentioned processing agent application member and the processing agent application member is separated from the artificial hair and then heated, it can be said that the heating step is carried out after the application step. Also, for example, when the bleaching agent is applied to the processing agent application member and the artificial hair is heated together with the processing agent application member immediately after contacting the artificial hair with the processing agent application member, it can be said that the heating step is carried out simultaneously with the application step.

[0080] The heating method is not particularly limited and can be appropriately selected, and examples thereof include ironing, hot plate heating, steaming, dry heat treatment, and the like.

[0081] The heating temperature in the heating step can be appropriately selected as long as it is a temperature at which the disperse dye migrates. For example, the heating temperature is preferably 150°C or higher and 190°C or lower, and more preferably 160°C or higher and 180°C or lower. If the heating temperature is too high, the artificial hair may be damaged, so if the heating temperature is within the above range, the artificial hair may not be damaged and the quality may be improved. If the heating temperature is too low, the bleaching may not be sufficient or may take too long, so if the heating temperature is within the above range, the bleaching may be performed without impairing productivity.

[0082] The heating time in the heating step can be appropriately selected and is not particularly limited. For example, when the heating temperature is 150°C or more and 190°C or less, the heating time can be 1 minute or more and 10 minutes or less. If the heating time is too short, the artificial hair may be damaged, and if the heating time is too short, the bleaching may not be performed sufficiently.

[0083] The heating step may involve heating once or multiple times.

[0084] In the heating step in this embodiment, it is preferable to apply heat while applying pressure to the artificial hair. By applying heat while applying pressure, uneven heating can be reduced, and it becomes easier to uniformly bleach the target area.

[0085] The pressure to be applied is not particularly limited, and may be, for example, 0.1 kg / cm 2 More than 1kg / cm 2 The method of applying pressure is not particularly limited, and examples thereof include a known heat press machine.

[0086] In the heating step of this embodiment, it is preferable to apply heat to the artificial hair while contacting the transfer material. When the transfer material is used, it becomes easier to apply heat and pressure to the artificial hair, improving quality and work efficiency. In addition, since the disperse dye of the artificial hair can be transferred to the transfer material, it is easier to decolorize the artificial hair and it is possible to prevent the equipment from being contaminated by the disperse dye. In addition, the amount of disperse dye remaining in the artificial hair after the heating step can be further reduced.

[0087] The transfer material can be appropriately selected, and examples thereof include paper, cloth, etc. In addition, resin, etc. may be used. The transfer material may be one or more, or multiple materials may be used in layers.

[0088] The above-mentioned processing agent application member may also serve as the transfer-receiving material. In this case, after the processing agent application member is brought into contact with the artificial hair to apply the processing agent, the processing agent application member may not be removed, and the processing agent application member may be heated while still in contact with the artificial hair. In this case, there is no need to prepare a processing agent application member separately from the transfer-receiving material, and the heating step can be performed while the processing agent application member is in contact, improving productivity.

[0089] Fig. 9 is a diagram for explaining a typical example in which a transfer material is used. Fig. 9(A) is a diagram showing a typical process of contacting a transfer material 37 with an artificial hair 10 and applying heat and pressure. The arrows in the diagram show the heat and pressure typically. The direction of the heat and pressure is not particularly limited, and may be from one direction or from multiple directions, for example, from one direction and the direction opposite to the one direction. The location of the heat and pressure may be one location or multiple locations.

[0090] 9(B) is a diagram showing a schematic diagram of the disperse dye 52 moving to the transfer material 37. As shown by the arrows, the disperse dye 52 moves from the artificial hair 10 to the transfer material 37. As a result, a bleached portion 11 (broken line portion) in the artificial hair 12 is formed.

[0091] In the heating step in this embodiment, a shielding member may be used during heating. Fig. 10 is a diagram for explaining a schematic example of a case where a shielding member is used, and is an example of a case where heating is performed using a hair sheet 30. As shown in Fig. 10(A), a shielding member 38 having an opening 39 is placed on the hair sheet 30. The black arrow in the figure shows a schematic example of placing the shielding member 38 on the hair sheet 30.

[0092] 10(B) is a schematic diagram showing the cross section of the hair sheet 30 after the shielding member 38 is placed on the hair sheet 30. By using such a shielding member 38, it is possible to limit the area of ​​the artificial hair 10 to be heated, and it is possible to prevent damage to the area to which the bleaching agent is not applied. This improves the quality.

[0093] In the example shown in Fig. 10, the description of the application of the bleaching agent is omitted. For example, the bleaching agent can be applied to the artificial hair 10 by a processing agent application member. When heating, the artificial hair 10 may be heated together with the processing agent application member, or the processing agent application member may be removed so that it is not heated.

[0094] Next, another example of the heating step will be described. In the heating step in this example, heating is performed using a jig having a handle and a rod-shaped heating portion. When using a conventional heating device, press heating is performed using a planar heating section, which results in heating of areas that do not need to be heated. When using a conventional heating device, in order to prevent heating of areas that do not need to be heated, it is necessary to use a mount 38 as shown in Fig. 10, for example, which is troublesome. On the other hand, in this example, the artificial hair can be heated locally, so that the parts that do not need heating are not heated, and deterioration of quality due to unnecessary heating can be prevented. Also, in this example, it is not necessary to use a mount 38 as shown in Fig. 10, for example, so the labor of heating can be reduced compared to conventional press heating, and productivity can be improved. Also, in this example, heating can be performed locally by using the above-mentioned jig, so it is expected to save electricity and shorten the heating time compared to conventional press heating.

[0095] 11 is a diagram for explaining an example of a jig used in the heating step of this example, where (A) is a schematic side view as seen from one side, (B) is a schematic plan view as seen from below, and (C) is a schematic side view as seen from the other side.

[0096] The jig 60 in this example has a handle 61 , a heating part 62 , and a cord 63 . The cord 63 is connected to a power source (not shown) and supplies power to the heating section 62 . The heating section 62 is a section whose temperature increases due to the electric power from the power source, and heats the artificial hair 10. The heating section 62 is made of, for example, metal. The handle 61 is a part that is held by the user, for example, in the hand. For example, the user holds the handle 61 in the hand and brings the heating part 62 into contact with the artificial hair 10 or the processing agent application member to heat it. Having the handle 61 on the jig 60 has the advantage that the user can easily handle the jig 60 and apply pressure to it.

[0097] The schematic plan view shown in (B) is a view of the jig 50 as seen from below, the below being the side facing the artificial hair 10 during heating. In the figure, the contact portion 62a is shown. The contact portion 62a may heat the artificial hair 10 by contacting another member such as a transfer-receiving material, or may heat the artificial hair 10 by directly contacting the artificial hair 10. It is preferable that the contact portion 62a heats the transfer-receiving material from above, in which case the effect of heating the artificial hair while contacting the transfer-receiving material described above can be obtained.

[0098] As shown in (C), the heating part 62 in this example has a shape tapered toward the contact part 62a when viewed from one side. When the heating part 62 has a shape tapered toward the contact part 62a in this way, there is an advantage that the heating part 62 is easy to fabricate when heating the artificial hair 10 more locally, but the shape is not limited to this.

[0099] As shown in the figure, the heating part 62 is rod-shaped, and the rod shape here means an elongated shape, and the cross-sectional shape is not particularly limited. The rod shape of the heating part 62 may be expressed as a shape having an axis in the arrangement direction of the artificial hair 10.

[0100] As shown in Fig. 11(B), the planar shape of the contact part 62a when viewed from the artificial hair 10 side is a rectangle having long and short sides. The long side is the left-right direction of the paper, and the short side is the up-down direction of the paper. Since the heating part 62 is rod-shaped, the planar shape of the contact part 62a has long and short sides.

[0101] FIG. 12 is a diagram for explaining the heating step of this example. 10(A) is a diagram showing an example of the positional relationship between the jig 60 and the artificial hair 10, and a schematic diagram showing the direction in which the jig 60 is moved. For example, the jig 60 is moved in the direction of the white arrow in the figure. (B) is a schematic diagram showing a state in which the contact part 62a of the heating part 62 is in contact with the processing agent application member after the jig 60 is moved as in (A). By bringing the heating part 62 into contact as in (B), the artificial hair 10 can be heated. (C) is an enlarged cross-sectional view of the state of (B) seen from another direction. (C) may also be an enlarged side view.

[0102] Figure 13 is a perspective schematic diagram of Figure 12. Figures 13(A) and (B) correspond to Figures 12(A) and (B), respectively. However, the number of artificial hairs 10 and the like do not match. Also, the paper 64 is omitted from Figure 13.

[0103] In the example shown in Fig. 12 and Fig. 13, filter paper 65 is used as the processing agent application member. As shown in Fig. 12(A) and Fig. 13(A), the bleaching processing agent is impregnated into the filter paper 65, and the filter paper 65 is brought into contact with the artificial hair 10. Next, as shown in Fig. 12(B) and Fig. 13(B), the jig 60 is moved to bring the contact part 62a of the heating part 62 into contact with the filter paper 65, and heating is performed while applying pressure. Although not particularly limited, for example, the user holds the handle 61 in his / her hand and presses it downward while fixing the position of the jig 60 for several seconds to several minutes. This allows the artificial hair 10 to be heated, the bleaching processing agent in the artificial hair 10 to be applied, and the heated part can be bleached.

[0104] In this example, paper 64 is provided under the artificial hair 10. The paper 64 can be used as a contamination prevention member to prevent contamination by dyes. For example, silicone paper can be used as the contamination prevention member. By using the contamination prevention member, contamination of the device can be prevented. As shown in FIG. 12, it is preferable to place the artificial hair 10 on the paper 64 (contamination prevention member), place filter paper 65 on the artificial hair 10, and heat the artificial hair 10 from the filter paper 65 (processing agent application member) side with a jig 60.

[0105] In this example, the heating step is carried out while the filter paper 65 containing the bleaching agent is in contact with the artificial hair 10, so it can be said that the application of the bleaching agent and heating of the artificial hair 10 are carried out simultaneously. In the present invention, it is sufficient that the artificial hair 10 is not heated before the application of the bleaching agent. Alternatively, the filter paper 65 containing the bleaching agent may be brought into contact with the artificial hair 10 to apply the bleaching agent, and the heating step may be carried out after removing the filter paper 65.

[0106] In this example, the artificial hairs 10 are arranged with gaps between them, and then the bleaching agent is applied and heating is performed. The state in which the artificial hairs 10 are arranged with gaps between them refers, for example, to a state in which the artificial hairs 10 are arranged as in a hair sheet 30 (e.g., FIG. 10(A)). In this way, multiple artificial hairs 10 can be bleached together, which is efficient. Also, in this example, the heating unit 62 is rod-shaped, so that only the necessary range of the artificial hairs 10 can be heated, and multiple artificial hairs 10 can be heated simultaneously and locally, which is efficient and prevents deterioration of quality.

[0107] In this example, the artificial hair 10 can be locally heated, and the parts that do not need heating are not heated, so that power saving can be expected. The heating temperature and pressure can be within the ranges described above. The heating temperature can be appropriately set taking into consideration the hair to be used, etc.

[0108] In this example, the arrangement direction of the artificial hairs 10 is the same as the longitudinal direction (or axial direction) of the heating unit 62. In this way, a plurality of artificial hairs 10 can be heated simultaneously and locally, improving productivity.

[0109] The planar shape of the contact part 62a shown in FIG. 11(B) can be appropriately selected in consideration of, for example, the number of artificial hairs 10 and the range to be bleached. For example, a shape of 2.5 mm×270 mm can be mentioned. The planar shape of the contact part 62a can be appropriately selected and is not particularly limited, but for example, the short side length is preferably 1 mm or more and 30 mm or more, and the long side length is preferably 10 mm or more and 400 mm or more. The short side length of the contact part 62a corresponds to the width of the artificial hair 10 to be bleached, so it may be appropriately determined in consideration of the range to be bleached. The long side length of the contact part 62a corresponds to the width to arrange the artificial hairs 10, so it may be appropriately determined in consideration of how many artificial hairs 10 are to be processed at one time.

[0110] When the short side length of the contact portion 62a is within the above range, it becomes easier to heat only the necessary area of ​​the artificial hair 10, and heating of unnecessary areas can be suppressed. Also, it is possible to prevent the bleached area from becoming too small and to prevent the bleached area from becoming too large. When the long side length is within the above range, it is possible to heat a large number of artificial hairs 10 at the same time, and the jig 60 does not become too large, providing excellent operability. Also, by having the short side and long side lengths be equal to or greater than the above lower limit, it is possible to prevent the fabrication of the jig 60 from becoming complicated.

[0111] Heating using the jig 60 is not limited to the case where the artificial hairs 10 are arranged with gaps provided as in the illustrated example, but can also be applied to the case where the artificial hairs 10 are bundled. An example of the state where the artificial hairs 10 are bundled is the state shown in Fig. 3B. In this case, it is preferable that the axial direction (which may be the longitudinal direction) of the heating unit 62 and the bundled direction of the artificial hairs 10 are the same.

[0112] Next, the case where the above-mentioned jig 60 is used will be further described with reference to another drawing. Fig. 14 is an enlarged schematic cross-sectional view for explaining this example, and is a view similar to Fig. 12(C). In Fig. 12(C), the width (length in the Y direction) of the filter paper 65, which is the processing agent application member, and the width of the contact part 62a are approximately the same, but this embodiment is not limited to this and can be modified as appropriate.

[0113] As shown in FIG. 14, the width of the filter paper 65 may be larger than the width of the contact portion 62a. FIG. 14(A) is a schematic cross-sectional view of the contact portion 62a in contact with the filter paper 65, and the width (length in the Y direction) of the filter paper 65 is larger than the width of the contact portion 62a. FIG. 14(B) is a schematic view of the state when the heating by the jig 60 progresses. As shown in the figure, in the artificial hair 10, only the part heated by the contact portion 62a, in other words, for example, the part facing the contact portion 62a, is decolorized. Therefore, it is not necessary to prepare a processing agent application member that matches the width to be decolorized, and heating can be performed very simply. Therefore, as shown in the perspective view of FIG. 14(C), even if a large-sized processing agent application member 65 is used or the decolorization processing agent is applied over a wide area, only the target part can be decolorized.

[0114] The effects of this example will be further explained. When using a conventional heating device without using the above jig 60, an iron or press heating device with a wide heating area is used. In this case, it is necessary to prepare a processing agent application member that matches the width to be bleached, which is time-consuming. For example, when the processing agent application member is paper, it is cut or twisted to apply the bleaching agent to the desired area. Therefore, in order to bleach only the desired area of ​​the artificial hair 10, it is necessary to prepare the necessary members and devise a heating method, making it difficult to improve both quality and productivity.

[0115] On the other hand, when the jig 60 is used as in this example, only the part of the artificial hair 10 corresponding to the contact part 62a is bleached, so there is no need to apply the bleaching agent only to the target part, and there is no need to prepare a processing agent application member that matches the width to be bleached. Furthermore, according to this example, the time and effort of aligning the position of the contact part 62a of the jig 60 with the part of the artificial hair 10 to which the bleaching agent has been applied is also unnecessary, and the work is simplified. Furthermore, even if there is variation in the range to which the bleaching agent is applied for each artificial hair 10, only the part of the artificial hair 10 corresponding to the contact part 62a is bleached, so that the occurrence of quality variation (variation in the range to be bleached) for each artificial hair 10 can be suppressed. From these points, according to this example, both quality and productivity can be improved.

[0116] (Method of producing hair for hair growth) The method for producing hair for hair growth of the present invention will be described. The matters already explained above may be omitted.

[0117] According to the method for producing hair for hair growth of the present invention, it is possible to produce hair for hair growth with bleached annular portions, and to produce hair for hair growth in which knots are not noticeable when used on a person's head.

[0118] As explained in the examples of Figures 4 and 5 above, hair for hair addition is artificial hair with a ring-shaped portion formed therein. In the method for producing hair for hair addition of the present invention, the embodiments can be defined according to the stage at which the ring-shaped portion is formed.

[0119] One embodiment of the method for producing hair for hair growth of the present invention includes an application step of applying a bleaching agent to a portion of artificial hair dyed with a disperse dye, a heating step of applying heat to the artificial hair after the application step or simultaneously with the application step to bleach a portion of the artificial hair, and a first annular portion formation step of forming a ring-shaped portion of variable size in the bleached portion of the artificial hair after the heating step, wherein the bleaching agent contains at least one compound selected from the above general formula (1) and the above general formula (2).

[0120] Another embodiment of the method for producing hair for hair growth of the present invention includes a second annular portion forming step of forming a ring-shaped portion of artificial hair dyed with a disperse dye to form a ring-shaped portion of variable size, an application step of applying a bleaching agent to the ring-shaped portion after the second annular portion forming step, and a heating step of applying heat to the artificial hair to bleach the ring-shaped portion after or simultaneously with the application step, wherein the bleaching agent contains at least one compound selected from the above general formula (1) and the above general formula (2).

[0121] <Annular portion forming process> In the first annular portion forming step, an annular portion is formed on the artificial hair after the heating step. In the second annular portion forming step, an annular portion is formed on the artificial hair before the application step. As a method for forming the annular portion, a commonly known method can be used in both the first annular portion forming step and the second annular portion forming step.

[0122] For example, as shown in Figures 4(A) and 5(A), one hair for hair addition may be made from one artificial hair. As shown in Figures 4(B) and 5(B), one hair for hair addition may be made from two artificial hairs.

[0123] In the above-mentioned method 1, as shown in Fig. 1 etc., the application step and the heating step are performed before forming the annular portion 18. For this reason, it is assumed that the first annular portion forming step is performed in the case of method 1. When forming the annular portion in the first annular portion forming step, the annular portion is formed after bleaching, so that bleaching unevenness can be further reduced and quality can be improved.

[0124] In the above-mentioned method 2, as shown in Fig. 8 etc., the application step and the heating step are performed after the annular portion 18 is formed. For this reason, it is assumed that the second annular portion forming step is performed in the case of method 2. When the annular portion is formed in the second annular portion forming step, it has the advantage of being easy to manufacture because the annular portion is decolorized after it is formed.

[0125] In both the first annular portion forming step and the second annular portion forming step, it is not necessary to bleach the entire annular portion 18. If only a part of the annular portion 18 is bleached, the effect of making the knot less noticeable can be obtained. It is preferable to adjust the part to be bleached taking into consideration the size of the annular portion 18 before the hair for hair extension 16 is used on a person's head, the thickness of the human hair 40, etc.

[0126] The method for forming the annular portion is not particularly limited, and any known method can be used. For example, the method disclosed in JP-A-2023-23892 can be mentioned.

[0127] (Hair extension method) The hair growth method of the present invention will be described. The hair growth method of the present invention is characterized by using artificial hair bleached by the artificial hair bleaching method of the present invention, or hair for hair growth produced by the hair for hair growth production method of the present invention. The matters already explained above may be omitted.

[0128] In the hair-growth method of the present invention, the bleached part of the artificial hair is knotted to make the knot less noticeable. Also, in the hair-growth method of the present invention, even when hair for hair growth is used, the bleached part of the hair for hair growth is knotted to make the knot less noticeable.

[0129] One embodiment of the hair growth method of the present invention is a hair growth method using artificial hair bleached by the artificial hair bleaching method of the present invention, which includes a first tying step of tying the artificial hair to one or more natural hairs growing from a human head, and is characterized in that the first tying step is performed by tying the bleached portion of the artificial hair to form a knot.

[0130] Figure 15 is a diagram for explaining an example of the first tying step. The example shown in this figure is an example in which artificial hair 12 without a ring part is used. As shown in (A), the artificial hair 12 used in the hair increase method of this example has a bleached central part and consists of a bleached part 11 and an unbleached part 13.

[0131] In this example, first, as shown in (A), the artificial hair 12 is folded in half and the bleached portion 11 is entangled with the natural hair 40. Next, as shown in (B), a loop is formed in the bleached portion 11 by (A), so the end of the artificial hair 12 is passed through the loop. This operation is shown diagrammatically by arrows.

[0132] Next, as shown in (C), the end of the artificial hair 12 is passed through the loop, and then the end side of the artificial hair 12 is pulled as shown by the arrow. This causes the artificial hair 12 to be knotted to the natural hair 40, as shown in (D). As a result, the bleached portion 11 forms a knot 20. According to the example shown in FIG. 15, the first tying step can be performed without complicated operations, and the bleached portion 11 becomes the knot 20. As a result, the knot becomes less noticeable, and hair augmentation can be achieved with a natural look.

[0133] Another embodiment of the hair growth method of the present invention is a hair growth method using hair for hair growth prepared by the method for preparing hair for hair growth of the present invention, characterized in that it includes a first ring-closing step of passing the ring-shaped portion through one or more natural hairs growing from a person's head and closing the ring-shaped portion.

[0134] 7 above is a diagram illustrating an example of the first loop-closing step. As described above, the annular portion 18 is passed through the natural hair 40, and the straight portion 19 is pulled in the direction of the arrow (A). This closes the annular portion 18, and the hair for hair addition 14 is tied to the natural hair 40 (B). In this example, the annular portion 18 uses bleached hair for hair addition 16, so the bleached portion 15 becomes the knot 21, and the knot 21 is difficult to see.

[0135] In the case of the example shown in Fig. 7, that is, in the case of the hair addition method using hair 14 for hair addition having an annular portion 18, there is an advantage that hair addition can be performed more easily than in the example shown in Fig. 15. In the case of the example shown in Fig. 7, after the annular portion 18 is passed through the natural hair 40, the straight portion 19 can be pulled, so that it can be easily tied to the natural hair 40.

[0136] (How to make a wig) The method for producing a wig of the present invention will be described. The method for producing a wig of the present invention is characterized by using artificial hair bleached by the method for bleaching artificial hair of the present invention, or hair for hair growth produced by the method for producing hair for hair growth of the present invention. Explanation of the matters already explained above may be omitted.

[0137] In the method for making a wig of the present invention, when artificial hair is tied to the wig base, the bleached part of the artificial hair is tied in a knot, so that the knot is not noticeable. Also, in the method for making a wig of the present invention, even when hair for hair addition is used, when the hair for hair addition is tied to the wig base, the bleached part of the hair for hair addition is tied in a knot, so that the knot is not noticeable.

[0138] One embodiment of the method for making a wig of the present invention is a method for making a wig using artificial hair bleached by the artificial hair bleaching method of the present invention, and includes a second tying step of tying the artificial hair to a string-like or thread-like base of the wig, characterized in that the second tying step ties the bleached portion of the artificial hair to form a knot.

[0139] Fig. 16 is an enlarged view of a main part for explaining an example of a wig produced by the production method of the present invention. In the illustrated example, for the purpose of explanation, one artificial hair is tied to the wig base. Fig. 17 is a view for explaining an example in which multiple artificial hairs are tied to the wig base. In Figs. 16 and 17, (A) is an example included in the present invention, and (B) is an example not included in the present invention.

[0140] Fig. 16(A) is a diagram showing the knot 20 after the second tying step has been carried out. When making a wig using the artificial hair 12 produced according to the present invention, the bleached portion of the wig base 42 forms the knot 20 to which the artificial hair 12 is tied. This makes the knot 20 less noticeable. As a result, as shown in Fig. 17(A), the wig made according to the present invention has an inconspicuous knot 20 and can have a natural appearance.

[0141] On the other hand, the example shown in Fig. 16(B) is an example of a wig made using unbleached artificial hair 10. In this case, the knot 20 of the artificial hair 10 tied to the wig base 42 is not bleached. Therefore, the knot 20 is visually recognized as a black lump (black lump). Also, as shown in Fig. 17(B), in wigs not included in the present invention, the knot 20 is visually recognized as a black lump (black lump), resulting in an unnatural appearance. EXAMPLES

[0142] The present invention will be described in more detail below by way of examples, but the present invention is not limited to these examples.

[0143] (Examples 1 to 3, Comparative Examples 1 to 3: Bleaching of Artificial Hair (1)) <Application process> A bleaching agent shown in Table 1 below was applied to the artificial hair 10 of the hair sheet 30 shown in Figure 1(A) using a processing agent application member. The bleaching agent was applied to the center of the stretched artificial hair 10. The bleaching agent was applied using a cord 36 shown in Figure 2. As shown in the figure, the bleaching agent was held on the cord 36, and then the cord 36 was brought into contact with the artificial hair 10 to apply the bleaching agent. The artificial hair 10 in the hair sheet 30 is made of polyester and is dyed black with a common disperse dye.

[0144] In Table 1, the dibasic acid diester mixture corresponds to a mixture of compounds represented by general formula (1). The dibasic acid diester mixture was a mixture of 63 mass % dimethyl glutarate, 24 mass % dimethyl succinate, and 13 mass % dimethyl adipate. In addition, X in dimethyl glutarate is a trimethylene group, X in dimethyl succinate is an ethylene group, and X in dimethyl adipate is a tetramethylene group. 1 and R 2 is a methyl group.

[0145] <Heating process> The strand 36 used in the application step was heated by a heat press while still in contact with the artificial hair 10. The strand 36 functions as the transfer material 37 shown in FIG. 9, for example. During heating, a shielding member 38 shown in FIG. 10 was used. The shielding member 38 was made of commercially available thin cardboard. The heating temperature was 180°C, the heating time was 4 minutes, and the pressure was 0.5 kg / cm. 2 Heating was performed twice at 180℃ for 4 minutes.

[0146] After the heating step, the artificial hair was visually evaluated according to the following evaluation criteria. The results are shown in Table 1. A score of "2" or above is considered a pass.

[0147] [Evaluation Criteria] 3: The bleached parts of the artificial hair appear the same or almost the same color on white paper and are not noticeable. 2: The bleached parts of the artificial hair appear lighter on white paper. 1: It is difficult to distinguish the bleached parts of the artificial hair on white paper. 0: No bleaching of the artificial hair is observed on the white paper

[0148] [Table 1]

[0149] In the examples with a bleaching effect of 2 or more, the center of the artificial hair was bleached and became transparent, for example, as shown in Figure 1 (B) and Figure 2 (E). The bleached area was about 5 mm. Also, as can be seen from Table 1, in Comparative Examples 1 to 3, which did not use the compounds represented by general formula (1) or general formula (2), bleaching was not achieved or was insufficient.

[0150] (Example 4: Bleaching of Artificial Hair (2)) Bleaching was carried out in the same manner as in Example 1, except that two hair sheets 30 were stacked in layers. As a result, the center part of the artificial hair was bleached in the same manner as in Example 1. In Example 4, productivity was improved.

[0151] (Example 5: Bleaching of Artificial Hair (3)) In Example 1, the applying step and the heating step are carried out in the configuration shown in FIG. 11, FIG. 12(A) and FIG. 12(B), and FIG. 14 without using the string 36, the shielding member 38, and the heat press machine. In Example 5, filter paper 65 was used as a processing agent application member, and the filter paper 65 was impregnated with a decolorizing processing agent. The filter paper 65 was brought into contact with the artificial hair 10 of the hair sheet 30 from above, and the heating part 62 (contact part 62a) of the jig 60 was brought into contact with the filter paper 65 from above to perform heating. The filter paper 65 also functions as a transfer material. Furthermore, in Example 5, paper 64 (contamination prevention member) was used and placed under the artificial hair 10. In Example 5, the user held the handle 61 of the jig 60 with his hand and heated at 180°C for 30 seconds while applying pressure. In Example 5, heating could be performed more easily than in Example 1.

[0152] (Example 6: Bleaching of hair for hair growth) As shown in Figures 8(A) and (B), a number of hairs 14 for hair growth having annular portions 18 were immersed in a bleaching agent. The bleaching agent used was the same as in Example 1. These hairs 14 for hair growth were heated by the above-mentioned heat press while being brought into contact with a transfer material 37. The heating conditions were the same as in the above-mentioned Example. As a result, hairs 16 for hair growth having bleached annular portions 18 were obtained as shown in Figure 8(C). [Explanation of symbols]

[0153] 10 Artificial hair (not bleached) 11 Bleached parts of artificial hair 12 Artificial hair (after bleaching) 13 Unbleached parts of artificial hair 14 Hair for hair growth (no bleaching) 15 Bleached areas of hair for hair extensions 16 Hair for hair growth (after bleaching) 18 Circular section 19 Straight section 20 Knots (Artificial Hair) 21 Knots (hair extensions) 30 Hair Sheet 31 Support member 32 Opening 33 Fixing member 34 Support stand 36 Paper 37 Transferred material 38 Shielding material 39 Opening 40 Natural Hair 42 Base 50 Processing Agent 51 Storage section 52 Disperse dye 60 Jig 61 Toride 62 Heating section 62a Contact part 63 Code 64 Paper 65 Filter Paper

Claims

1. A step of applying a bleaching agent to a part of the artificial hair dyed with a disperse dye; A heating step of applying heat to the artificial hair after the application step or simultaneously with the application step to bleach a part of the artificial hair, The bleaching agent contains at least one compound selected from the following general formula (1) and the following general formula (2): A method for bleaching artificial hair. R １ OOC-X-COOR ２ ・・・(1) R ３ COO-(AO)n-Y １ ・・・(2) In the general formula (1), X is an alkylene group or alkenylene group having 2 to 4 carbon atoms, R １ is an alkyl group having 1 to 4 carbon atoms; R ２ is an alkyl group having 1 to 4 carbon atoms, In the general formula (2), AO is an alkyleneoxy group having 2 to 3 carbon atoms, n is an integer of 1 to 3, and R ３ is an alkyl group having 1 to 4 carbon atoms; Y １ is a hydrogen atom or R ４ CO group, R ４ is an alkyl group having 1 to 4 carbon atoms.

2. In the application step, the bleaching agent is applied to the artificial hair in a state where the artificial hair is arranged with gaps therebetween or in a state where the artificial hair is bundled.

2. The method for bleaching artificial hair according to claim 1.

3. The applying step comprises holding the bleaching agent in a processing agent applying member and bringing the processing agent applying member into contact with a part of the artificial hair.

2. The method for bleaching artificial hair according to claim 1.

4. The application step is a step of immersing the artificial hair in the bleaching agent.

2. The method for bleaching artificial hair according to claim 1.

5. The heating step applies heat to the artificial hair while applying pressure to the artificial hair.

2. The method for bleaching artificial hair according to claim 1.

6. The heating step applies heat to the artificial hair while contacting a transfer material with the artificial hair.

2. The method for bleaching artificial hair according to claim 1.

7. The heating step is performed using a jig having a handle and a rod-shaped heating portion.

3. The method for bleaching artificial hair according to claim 2.

8. A step of applying a bleaching agent to a part of the artificial hair dyed with a disperse dye; a heating step of applying heat to the artificial hair after the application step or simultaneously with the application step to bleach a part of the artificial hair; a first annular portion forming step of forming an annular portion having a variable size by forming the bleached portion of the artificial hair into an annular portion after the heating step, The bleaching agent contains at least one compound selected from the following general formula (1) and the following general formula (2): A method for producing hair for hair growth, comprising the steps of: R １ OOC-X-COOR ２ ・・・(1) R ３ COO-(AO)n-Y １ ・・・(2) In the general formula (1), X is an alkylene group or alkenylene group having 2 to 4 carbon atoms, R １ is an alkyl group having 1 to 4 carbon atoms; R ２ is an alkyl group having 1 to 4 carbon atoms, In the general formula (2), AO is an alkyleneoxy group having 2 to 3 carbon atoms, n is an integer of 1 to 3, and R ３ is an alkyl group having 1 to 4 carbon atoms; Y １ is a hydrogen atom or R ４ CO group, R ４ is an alkyl group having 1 to 4 carbon atoms.

9. A second annular portion forming step of forming a portion of the artificial hair dyed with the disperse dye into a ring to form a ring portion having a variable size; After the second annular portion forming step, a bleaching agent is applied to the annular portion; A heating step of applying heat to the artificial hair to bleach the annular portion after or simultaneously with the application step, The bleaching agent contains at least one compound selected from the following general formula (1) and the following general formula (2): A method for producing hair for hair growth, comprising the steps of: R １ OOC-X-COOR ２ ・・・(1) R ３ COO-(AO)n-Y １ ・・・(2) In the general formula (1), X is an alkylene group or alkenylene group having 2 to 4 carbon atoms, R １ is an alkyl group having 1 to 4 carbon atoms; R ２ is an alkyl group having 1 to 4 carbon atoms, In the general formula (2), AO is an alkyleneoxy group having 2 to 3 carbon atoms, n is an integer of 1 to 3, and R ３ is an alkyl group having 1 to 4 carbon atoms; Y １ is a hydrogen atom or R ４ CO group, R ４ is an alkyl group having 1 to 4 carbon atoms.

10. A hair growth method using artificial hair bleached by the method for bleaching artificial hair according to any one of claims 1 to 7, A first tying step of tying the artificial hair to one or more natural hairs growing from a human head, The first tying step is to tie the bleached portion of the artificial hair into a knot. A hair growth method characterized by:

11. A hair growth method using hair for hair growth produced by the method for producing hair for hair growth according to claim 8 or 9, A first loop-closing step of threading the loop through one or more natural hairs growing from a human head and closing the loop. A hair growth method characterized by:

12. A method for producing a wig using artificial hair bleached by the method for bleaching artificial hair according to any one of claims 1 to 7, comprising the steps of: A second tying step is included in which the artificial hair is tied to a string-like or thread-like base of a wig; The second tying step is to tie the bleached portion of the artificial hair into a knot. A method for making a wig, comprising the steps of:

Images