JP6317515B1 - How to apply straight perm to hair - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method of applying a straight perm to hair with less hair damage and improved hair gloss. SOLUTION: A method of applying a straight permanent to hair according to an embodiment includes (i) a step of applying a first agent containing a reducing agent, an alkaline agent and water to the hair, (ii) after the step (i), Spraying water vapor having a particle size of 0.26-1 nm and a temperature of 130-230 ° C. on the hair; and (iii) 160 on the hair immediately after or while performing the spraying. A step of stretching the hair by applying a temperature of ˜170 ° C. [Selection] Figure 1

Description

  The present invention relates to a method of applying a straight perm to hair.

  In general, a method of applying a straight perm to the hair is often used as a method of straightening hair with a habit or a hair with a perm. For example, Patent Document 1 discloses a method for applying a straight perm that includes treating hair lotion containing natural water on hair before applying one liquid. In addition, for example, a method of applying a straight perm to hair using a steam iron is known. In these methods, hair damage due to the heat of the medicine used or the hair iron is a problem.

JP 2008-54945 A

  It is an object of the present invention to provide a method for applying a straight perm to hair with less hair damage and improved hair gloss.

  The method of applying a straight permanent to hair according to the embodiment includes (i) a step of applying a first agent containing a reducing agent, an alkaline agent and water to the hair, (ii) after step (i), 0.26 to Spraying water vapor having a particle size of 1 nm and having a temperature of 130 to 230 ° C. toward the hair; and (iii) immediately after the spraying or while performing the spraying, the hair is heated to 160 to 170 ° C. It includes the step of stretching the hair by applying temperature.

  According to the method of applying the straight perm of the present invention, the hair can be straightened while maintaining the gloss of the hair.

It is a flowchart which shows the method of applying a straight permanent to the hair of embodiment. It is a perspective view which shows the external appearance of the water vapor generator used for the method of embodiment. It is a schematic diagram explaining the process of extending the hair in the method of embodiment. It is a schematic diagram which shows the state of the hair which performed the straight perm of embodiment in a cross section. It is a schematic diagram which shows the state of the hair which performed the conventional straight perm in a cross section.

  Hereinafter, a method of applying a straight permanent to the hair of the embodiment will be described with reference to FIGS.

  “Straight perm” means that after cystine bonds, salt bonds, hydrogen bonds, etc. contained in the hair are cut, the hair is formed into straight hair, and the cut cystine bonds, salt bonds, and hydrogen bonds are bonded again. To make hair straight. The method of applying the straight perm may be a method of applying curly hair correction.

  FIG. 1 is a flowchart showing a method of applying a straight permanent to hair according to an embodiment. Below, each process included in the method of embodiment shown in FIG. 1 is demonstrated in detail.

  First, in the step (S1), the first drug is applied to the hair. A 1st chemical | medical agent is a chemical | medical agent for cut | disconnecting a cystine bond, a salt bond, and a hydrogen bond, and contains a reducing agent, an alkaline agent, and water. The reducing agent may be any agent that can cleave cystine bonds contained in hair, for example. The alkaline agent may be any agent that can break a salt bond contained in the hair, that is, can soften the hair. Water, for example, swells hair by breaking the hydrogen bonds in the hair.

  As the reducing agent, for example, thioglycolates, sodium sulfite, cystine or salts thereof, cysteamine and the like can be used. As the alkaline agent, for example, monoethanolamine, sodium carbonate, sodium hydrogen carbonate, ammonia, ammonium carbonate, ammonium bicarbonate, arginine, or the like can be used. The first agent may contain any combination of the reducing agents and alkali agents listed above. It is preferable to use cysteamine as the reducing agent because there is little irritation to hair.

  The first agent may contain other components in addition to the reducing agent, the alkaline agent, and water. Such components are, for example, pH adjusters, hair protectants, humectants or solvents.

  The first drug is preferably creamy. When it is creamy, the first drug stays at the position where the hair is applied, and the effect of the first drug is more easily exhibited. Moreover, the amount applied can be adjusted according to the part of hair by being creamy. Application of the first drug to the hair can be performed, for example, by applying the first drug to the hair by hand or brush. In order to prevent the first drug from adhering to the scalp and roughening the scalp, it is preferable not to apply the first drug to a portion about 1 cm from the hairline.

  The step of applying the first drug is preferably performed while spraying water vapor on the entire hair. For example, the water vapor preferably has a particle size of 0.26 to 1 nm and a temperature of about 140 to 220 ° C. By applying the first drug while spraying such water vapor, the first drug can efficiently penetrate into the hair and the effect of the first drug can be further enhanced. Further, the penetration of moisture into the hair further promotes the breaking of hydrogen bonds, and the hair can be swollen. For example, it is preferable that the spraying of water vapor is continuously performed from before application of the first drug to after application. Such an apparatus for generating water vapor will be described in step (S4) described later.

  In the step (S2), the hair is left until the hair is softened with the first chemical applied. Softening refers to a state in which the salt bond and hydrogen bond of the hair are sufficiently cut, for example, the hair has elasticity like rubber and contracts when stretched, or the hair has a rod-like shape. It can be confirmed based on the fact that it does not immediately return to its original shape when wound. For example, if the first drug is applied and left for about 10 to 20 minutes, the hair can be sufficiently softened. While being allowed to stand, it is preferable to spray the water vapor used in the step (S1).

  By performing the steps (S1) and (S2) described above, the cystine bond, salt bond and hydrogen bond contained in the hair can be cleaved.

  Next, in step (S3), the hair is washed and then dried. The washing is preferably performed with, for example, 30 to 43 ° C. water or carbonated water. The washing is more preferably performed with carbonated water. The carbonated water may be “carbonated spring”. The carbonate concentration of carbonated water is preferably about 300 to 1000 ppm. When using carbonated water, the temperature is preferably 30 to 35 ° C. If it is this temperature, since carbonic acid dissolves more in water, it is easier to exhibit the above effect. Washing with carbonated water can be performed using, for example, a device that generates carbonated water, such as Tolcare (trade name: manufactured by Takara Belmont). By washing with carbonated water, the reducing agent and the alkaline agent contained in the first drug adhering to the hair and scalp are neutralized, and at the same time, the first drug is more removed from the hair and scalp, It can prevent the hair and scalp from being damaged or rough. Moreover, the stain | pollution | contamination adhering to hair and a scalp can be removed more efficiently.

  Drying may be performed, for example, by applying warm air with a dryer to hair that has been wiped off with a towel after washing. Drying is preferably carried out until there is no moisture on the outer surface of the hair. When the hair iron is applied to the hair in the step (S5) to be described later, the moisture present on the outside and inside of the hair is instantly caused by the heat of the hair iron by making the moisture not remaining on the outer surface of the hair by drying. The phenomenon of evaporating and destroying the cuticle existing outside the hair and the inner layer of the hair can be prevented. Thereby, drying and damage of the hair are reduced.

  However, when not only the outside of the hair but also the moisture inside the hair is lost by the drying process, it is difficult for the moisture to penetrate again into the inside of such hair. Therefore, it is preferable to perform drying while spraying the water vapor | steam demonstrated in the said process (S1) or the process (S4) mentioned later on the whole hair, for example. As a result, moisture is replenished inside the hair, and a reduction in moisture inside the hair due to drying can be prevented. As a result, it is possible to perform the steps after the step (S4) described later in a state where more moisture is contained in the hair.

  Next, water vapor is sprayed toward the hair in the step (S4). The water vapor has a particle size of 0.26 to 1 nm. The water vapor also has a temperature of about 130-230 ° C. More preferably, it has a temperature of 145 to 210 ° C. Such water vapor is also referred to as “superheated water vapor” having a particle size of 0.26 to 1 nm.

  Such water vapor can be generated, for example, by the water vapor generator 1 shown in FIG. The water vapor generator 1 has a boiler part 2 and a hand piece part 3. Water is boiled in the boiler unit 2, and the obtained water vapor is heated in a high temperature and high pressure environment of, for example, about 130 ° C. or more and about 3 atm or more. The heated water vapor is sent to the handpiece unit 3 by driving of the fan in the handpiece unit 3 and is sprayed from the spray port 4 of the handpiece unit 3. The water vapor sent to the handpiece unit 3 may be further heated to about 200 ° C. or more by the heating unit such as a heating wire provided in the handpiece unit 3 in the handpiece unit 3. It is sufficient that the water vapor has the above temperature at the time when it is ejected from the spraying port 4.

  As such a water vapor generating device, for example, Nanopresso EX (trade name: manufactured by Takara Belmont), Nanopresso PRO (trade name: manufactured by Takara Belmont), Parcky (trade name: manufactured by NAOMOTO) or the like can be used.

  In the step of spraying water vapor onto the hair, when using an apparatus such as that shown in FIG. 2, the water vapor is sprayed toward the hair by directing the spray port 4 toward the hair while the water vapor is ejected from the spray port 4. Can do. It is preferable to spray the water vapor by separating the spray port 4 from the hair, for example, by 20 to 30 cm. By spraying at a distance of 20 to 30 cm, it is possible to prevent excessive heat from being applied to the hair. Water vapor may be sprayed toward the hair bundle to be stretched in the step (S5) described later, or may be sprayed toward the entire hair.

  In the step (S5), the hair is stretched by applying a temperature of 160 to 170 ° C. to the hair immediately after spraying the water vapor in the step (S4) or while spraying.

  The step of stretching the hair may be performed after spraying water vapor, for example, or may be performed while spraying water vapor. Moreover, spraying of water vapor | steam may be performed for every hair | bristle bundle which is a part of hair, and water vapor | steam may be sprayed to the whole hair. The most preferred procedure is a procedure of stretching the hair into hair bundles while spraying water vapor on the entire hair. By stretching the hair while spraying water vapor on the whole hair, the water vapor is sprayed also on the hair after stretching on the hair before stretching. As a result, the hair before stretching is kept in a state where water vapor enters the inside, and the hair becomes easier to stretch. Further, the hair that has been stretched is replenished with moisture lost by the heat applied during stretching, and can be made straight while maintaining the gloss of the hair.

  For example, the hair may be stretched using a hair iron. For example, what has two plate parts which can pinch hair can be used as a hair iron, for example. The hair iron is preferably not a steam iron. Alternatively, it may be a steam iron, but it is preferably used in a state where steam is not generated.

  The step of stretching the hair (S5) is performed by stretching the hair while applying a temperature of 160 to 170 ° C. to the hair. For example, by setting the temperature of the plate portion of the hair iron to be 160 to 170 ° C., such temperature can be extended to the hair.

  An example of the steps (S4) and (S5) of extending the hair bundle using the water vapor generator and the hair iron will be described in detail below with reference to FIG. First, in a state where the water vapor 20 is sprayed on the entire hair 10 by the water vapor generator 1, a part of the hair bundle 11 is separated from the hair 10 by the comb 12 (a). While being sprayed, a portion of about 1 cm from the hairline 13 of the hair bundle 11 is sandwiched with the hair iron 5 (b). The hair iron 5 is set so that the temperature of the plate portion 6 is 160 to 170 ° C. Next, the curling iron 5 is slid in the direction of the hair tips 14 of the hair bundle 11 (arrows in the figure (c)) (c). In the step (c), for example, after the hair iron 5 is slid 2 to 3 times against the new hair portion 15 from the hairline 13 of the hair bundle 11 to about 5 cm, the hair iron 5 is slid once to the hair tip 14. Preferably. Next, another hair bundle that is not stretched is taken and steps (a) to (c) are performed. By repeating it, all hair can be stretched.

  In the step of stretching the hair (S5), the hair may be sprayed with water vapor when the hair iron 5 is not applied to the hair. For example, water vapor may be sprayed on the whole or part of the hair before the hair is stretched by the hair iron 5, or after the hair of one hair bundle is stretched, the whole or part of the hair is stretched before the next hair bundle is stretched. Water vapor may be sprayed, or after all the hair has been stretched, the whole or a part of the hair may be sprayed with water vapor. By adjusting the time for spraying water vapor by performing such spraying, the amount of water vapor sprayed throughout the step (S5) can be adjusted. For example, when applying a straight permanent to hair with a high degree of damage, it is preferable to spray water vapor for a longer time. For example, before the hair with a high degree of damage is stretched with a hair iron, it is preferable to spray water vapor on the damaged portion of the hair for 30 seconds to 1 minute. As a result, even hair with a high degree of damage can be straightened while maintaining its gloss.

  Next, in the step (S6), a second drug is applied to the hair. The second drug may be any drug in order to assist the oxidation reaction that recombines the cleaved cystine bond. The 2nd chemical | medical agent should just be a chemical | medical agent which contains sodium bromate (sodium bromate) or hydrogen peroxide water as an active ingredient, for example. The second drug may contain other components in addition to sodium bromate or hydrogen peroxide solution. Such components are, for example, pH adjusters, hair protectants, humectants or solvents.

  However, step (S6) may not be performed. This is because the hair is gradually oxidized by oxygen in the air during the steps (S3) to (S5), whereby the cystine bond cleaved in the steps (S1) to (S2) is rebound.

  When the step (S6) is performed, the hair is then washed and dried in the step (S7). Washing is preferably performed with, for example, 30 to 43 ° C. water or the above carbonated water. By washing with carbonated water, the second drug adhering to the hair and scalp can be further removed. For example, the hair may be dried by applying warm air to the hair from which moisture has been wiped off with a dryer or the like after washing.

  The method of the embodiment may further include a step of treating the hair with an agent that protects hair such as CMC (cell membrane complex), chitosan, or keratin before or after each step described above.

  According to the method described above, the hair can be straightened while maintaining the gloss of the hair. The reason will be described below.

  The water vapor sprayed in the step (S3) has a particle size of 0.26 to 1 nm. Since the distance between the cuticle and the cuticle present on the hair surface is about 0.5 to 1 nm, the water vapor can enter the gap of the cuticle, and the end that is the innermost layer of the cuticle It is thought that it is possible to reach the cuticle layer and the cortex layer and the medulla layer existing in the cuticle layer. Therefore, after the hair is sprayed or stretched while spraying, the hair can be kept sufficiently swollen and swollen throughout the entire process of stretching the hair.

  Moreover, when this water vapor is actually sprayed on the hair, the hair remains dry without getting wet. The reason for this is that water vapor having such a particle size penetrates into the hair as described above and is superheated water vapor. By continuing to spray, it is conceivable that the condensed moisture immediately becomes a gas. Therefore, according to the method of the embodiment, it is possible to stretch the hair with no moisture remaining on the hair surface with the hair iron. Therefore, in the process of stretching the hair, the moisture remaining on the outside of the hair is instantly evaporated by the heat of the hair iron, so that the moisture existing inside is also instantly evaporated, and the cuticle and the inner layer of the hair are destroyed. The phenomenon that the hair dries can be prevented. In addition, the cuticle is soft and easily damaged by moisture remaining on the outside of the hair, and the cuticle is prevented from being damaged or peeled off or the protein is denatured by physical stimulation or heat of the hair iron.

  Moreover, according to the method of embodiment, since water vapor | steam with a small particle size penetrates into the inside of hair, since it is higher in temperature than conventional water vapor, it has high thermal energy. Time for applying the hair iron to the hair in the step (S5) even though the temperature of the plate portion of the hair iron is a temperature (160 to 170 ° C.) for stretching the normal hair by the heat energy from the inside of the hair. Can be reduced. For example, the hair can be made straight enough by simply sliding the hair iron to the new hair part 2-3 times and to the other part once. As a result, hair drying and damage due to the heat of the hair iron can be reduced. In addition, by extending the hair using the heat of water vapor from the inside of the hair instead of from the outside of the hair, the epicuticle that is the outermost layer of the cuticle, which is easily heat-denatured, is difficult to denature, and the cuticle is damaged or peeled off. It is considered that the opening is reduced.

  As described above, the hair subjected to the straight perm by the method of the embodiment of the present invention contains much moisture and swells, and the cuticle and the inner layer are less damaged and peeled. For example, FIG. It is considered to have a cross section 30 approximated to an ellipse as shown in (a) or a cross section 31 approximated to a perfect circle as shown in (b) of FIG. The cuticles 32 and 33 in the cross sections 30 and 31 cover the entire periphery of the hair surface, respectively, and are considered to be in a closed state without damage or peeling. The hair in such a state is similar to the cross section of virgin hair, that is, straight hair that has not been treated with a permanent or the like. The light 34 and the light 35 that hit the hair shown in FIGS. 4A and 4B do not diffusely reflect, but reflect close to regular reflection, and thus have a glossy appearance. Conventionally, hair that has undergone straight perm or curly hair correction has been described as having a loss of luster, but hair treated by the method of the embodiment of the present invention is close to the appearance of virgin hair, so treatment such as perm It has a naturalness as if not. Even if the cuticle is originally open or dried, the cross-sectional shape approximates an ellipse or a perfect circle by using the method of the present invention, and the hair has a gloss equivalent to or higher than that of natural hair. Can be issued.

  On the other hand, hair that has been steam sprayed with a steam iron in the process of stretching the hair as in the prior art, or hair that has been stretched without steam spraying is, for example, a distorted ellipse as shown in FIG. It is considered that the cuticle 41 having the shape of the cross section 40 is peeled off or opened on the outer surface of the hair. Therefore, the light 42 that hits the hair is irregularly reflected, resulting in a dull appearance. The following can be considered as the reason for such a cross section.

  The water vapor generated using a conventional steam iron has a particle size so large that it does not enter between the cuticle (for example, conventional water vapor has a particle size of about 10 to 8000 μm) and has a temperature of Contains low water particles. When water vapor containing water particles having such a particle size is used, there is a high possibility that excess moisture remains on the outside of the hair when the hair iron is applied.

  When a hair iron is used with excess moisture remaining on the outside of the hair, the moisture present on the outside and inside of the hair is instantly evaporated by the heat of the hair iron as described above, and the hair cuticle and the inside of the hair are Breakage of the layer, excessive drying of the entire hair, and accompanying denaturation of the hair protein due to the heat of the hair iron easily occur. In addition, cuticles that are soft and easily damaged by excess moisture on the outside of the hair are likely to be damaged or peeled off by the heat or physical stimulation of the hair iron.

  Even in the method of stretching hair without using water vapor, heat of the hair iron tends to cause hair drying, hair protein denaturation, and cuticle opening. As a result, the hair is likely to lose its luster and strength.

  Due to factors such as destruction of the cuticle and the inner layer, damage to the cuticle, peeling and opening, hair drying, and protein denaturation, the hair subjected to straight perm by the conventional method has a cross section as shown in FIG. Conceivable. In addition, damage, peeling, and opening of the cuticle cause hair moisture and nutrients to flow out, which adversely affects the appearance, feel and strength of the hair. In addition, the above factors simultaneously cause carbonization of hair, decolorization of hair, dryness, split ends, broken hair, and the like.

  Hair subjected to straight perm by the method of the embodiment of the present invention has no cuticle damage, peeling, or opening for the reasons described above, has excellent appearance and touch, and reduces hair decolorization, dryness, split ends, cut hair, etc. Has been.

  Further, according to the method of the embodiment, it is easy to make the hair straight due to the swelling of the hair and the internal thermal energy as described above. Therefore, even if the reducing agent contained in the first drug has a weaker reducing power, such as cysteamine, the hair can be sufficiently straightened. Conventionally, when cysteamine is used alone as a reducing agent that cleaves cystine bonds, it has been considered that cysteamine has a low reducing power and is insufficient to make hair straight. However, according to the method of the present invention, even the first drug containing cysteamine alone as an active ingredient can be sufficiently straightened. In addition, even if the amount of the first drug used is reduced, the hair can be made straight enough. Therefore, not only healthy hair but also thin hair due to aging or constitution can be straightened without damaging the hair. In addition, adverse effects such as rough skin on a practitioner such as a beautician can be reduced.

  For the above reasons, according to the method of the embodiment of the present invention, the hair can be straightened while maintaining the gloss of the hair.

<Example>
The effects of the straight perm according to the method of the embodiment and the conventional straight perm were compared.

(Example)
First, water vapor was generated by nanopresso PRO (trade name: manufactured by Takara Belmont), and one agent was applied to the hair while spraying the entire hair. As an agent, Ecorute Straight Cosmetic Cream N (trade name: manufactured by BSP), Ecorute Straight Cosmetic Cream H (product name: manufactured by BSP) or HB Sprus Straight H 1 Agent (trade name: manufactured) It was used. Ecorte Straight Cosmetic Cream N and Ecorute Straight Cosmetic Cream H contain 1 to 5% by weight of ammonium thioglycolate and cysteamine HCl, respectively, and less than 1% by weight of sodium carbonate, cysteine HCl and arginine as active ingredients. HB Sprus Straight H contains 4 to 7 wt% ammonium thioglycolate, less than 1 wt% L-cysteine hydrochloride, 2 to 5 wt% monoethanolamine, and less than 1 wt% L-arginine as active ingredients . Application was performed on the entire hair except for a portion of about 1 cm from the hairline. Then, after applying water vapor for 10 to 20 minutes, the hair was washed with a carbonate spring at 35 ° C. and dried until the hair surface was free of moisture.

  Next, the hair was stretched with a hair iron while water vapor was generated again by nanopresso PRO and sprayed on the entire hair. The spraying was performed by separating the nano-presso PRO vapor spray port and the hair by 20 to 30 cm. The step of stretching was performed by pinching the hairline with a hair iron, sliding the hair iron against the new hair part 2 to 3 times, and then sliding the hair iron once to the hair tip. For a subject with a large degree of hair damage, water vapor was sprayed on the damaged part of the hair for 30 seconds to 1 minute before the hair was stretched with a hair iron.

  Next, two agents were applied to the hair. For subjects using Ecorute Straight Cosmetic Cream N or Ecorute Straight Cosmetic Cream H as one agent, Ecorute Straight Cosmetic Cream 2 (trade name: manufactured by BSP) is used as two agents, and HB Sprus Straight as one agent. For subjects using H 1 agent, HB Spruce Straight H 2 agent (trade name: manufactured by BSP) was used as 2 agents. Ecorte straight cosmetic cream 2 contains 5 to 10% by weight of sodium bromate as an active ingredient. HB Sprus Straight H 2 contains 1-2% by weight of hydrogen peroxide as an active ingredient. After applying the two agents, the hair was washed and dried.

(Comparative example)
In the comparative example, in the process of stretching the hair, the hair was stretched only with a hair iron and was not sprayed with any water vapor. In this example, when the hair was stretched, the hair did not stretch sufficiently unless the hair iron was slid three or more times from the hairline to the end of the hair bundle.

  After the method of the comparative example was performed on 20 men and 40 men and women, the method of the example was performed at intervals of 6 months to 3 years until new hairs grew. After that, the impression which compared the effect of a comparative example and an Example was described. The comparison of the effect was performed between the hair treated by the method of the comparative example and the new hair that grew after the treatment of the comparative example among the hair treated by the method of the example.

  As a result, in all subjects, the impression that the hair was sufficiently stretched was obtained according to the method of the example. Moreover, in all the test subjects, the impression that the finish was superior to the comparative example was obtained. Furthermore, the following impression was specifically reported about the method of the Example. “It does not seem to have a straight perm with a more natural finish than the comparative example” (20 women), “It is much moist than the curly hair correction of the comparative example and is easy to care for the hair. "(40 women)," The comparative example is a finish like a bite, but the example is a very natural finish "(40 women)," In the method of the example, an angel's ring (depending on the gloss of the hair) (The circular light seen in the head), and I don't think it's for hair that is straightening hair ”(30 women),“ The method of the example is natural and easy to care for. (30 males), "The curly hair was complex, but the method of the example is nice to have a natural and glossy finish" (20 females), However, in the method of the embodiment, the touch is very And moist, there is no at all flaky feeling "(30 cars woman).

  Therefore, according to the method of applying a straight perm to the hair according to the embodiment of the present invention, the hair can be made straight hair while being kept in a more natural state, for example, while keeping the gloss or not being dried. It became clear that we could do it.

DESCRIPTION OF SYMBOLS 1 ... Steam generator 5 ... Hair iron 10 ... Hair 11 ... Hair bundle 13 ... Hairline 14 ... Hair tip 15 ... New hair part 20 ... Water vapor

Claims (2)

(I) applying a first agent containing a reducing agent, an alkaline agent and water to the hair;
(I-2) A step of washing the hair and then drying the hair
(I-3) A step of boiling water in the boiler part of a sprayer including a boiler part and a handpiece part to generate water vapor, and heating the water vapor at 130 ° C. or higher and 3 atm or higher,
(I-4) A step of obtaining superheated steam having a particle size of 0.26 to 1 nm and a temperature of 200 to 230 ° C. by reheating the water vapor to 200 ° C. or higher in the handpiece part,
(Ii) after the step (i- 4 ), spraying the superheated steam toward the hair; and (iii) immediately after the spraying or while performing the spraying, the hair is heated to 160 to 170 ° C. A method of applying a straight perm to the hair, including a step of stretching the hair by applying a temperature. Spraying the superheated steam A method according to claim 1, wherein the superheated steam is sprayed to cover the whole of the hair.

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