TWI708055B - Method of measuring hair elasticity using shape maintaining pressure and apparatus for measuring hair elasticity - Google Patents

Abstract

Provided are a method of evaluating hair elasticity and an apparatus for measuring hair elasticity, wherein the method is capable of directly, non-invasively, and repeatedly performing measurement and reproducibly and accurately performing quantitative analysis in a human body. It is possible to decrease a time and cost for evaluating hair elasticity and highly reliable quantitative analysis may be performed by using the method of evaluating hair elasticity according to the present invention, such that the method according to the present invention may contribute to developing a product as a means of certifying quality.

Description

Method and application for measuring hair elasticity using shape maintaining pressure Equipment for measuring hair elasticity

The following disclosure is about a method of measuring hair elasticity using shape retention pressure, and more particularly about a method of measuring hair elasticity by measuring the maximum pressure when the hair with an arch shape is deformed, a measurement using it Method for improving hair elasticity effect of hair cosmetic composition in, and a device for measuring hair elasticity.

Generally speaking, hair is affected by various physical and chemical effects (such as frequent shampoo, perm treatment, bleaching or oxidative hair coloring treatment, coating, heat treatment using a dryer or the like, exposure to UV light, exposure to secondary Chloric acid and the like). Repairing damaged hair as described above is more difficult, and as the amount of damaged time increases, the hair undergoes a rapid aging process. Therefore, in order to maintain the hair healthier, it is necessary to frequently take appropriate care of the damaged hair, and it is necessary to make efforts to recognize the degree of damage to the hair and suppress the development of the damage.

Currently, as an evaluation method for evaluating the degree of hair damage, a method such as a physical property evaluation method or the like is known. For example, there is a method of surface analysis of hair using electron microscope (Swift. JA et al., J. Society of Cosmetic Chemists (1972) Vol. 23, p. 695) .), a tensile test method for measuring the mechanical strength of the hair (Donald, ED, et al., Journal of the Association of Cosmetic Chemists (1968) Vol. 19, p. 395), a method for measuring changes in the internal structure of the hair (Humphres, WT et al., Journal of the Association of Cosmetic Chemists (1972) Vol. 23, p. 359), a method of marking hair with fluorescent materials to measure the degree of damage using a fluorescent microscope (Tower (Tate), ML et al., Journal of the Association of Cosmetic Chemists (1993) Vol. 44, p. 347) and similar methods. However, in all methods, because analysis requires specific expensive equipment, and only those skilled in the art can operate these equipment, there are the following problems: the measurement process is complicated, and the analysis results may vary greatly depending on the hair position. , So that there is a problem of reproducibility of the analysis value. In addition, in order to evaluate the degree of damage to the hair as described above, it is inconvenient that the hair of the individual should be collected mainly, and it is impossible to repeat the measurement under the actual use conditions of the product for the human body.

Therefore, the applicant of the present invention tried to provide a method that can continuously evaluate hair elasticity depending on the product type, use time, and the like. However, in measuring the degree of damage to human hair (where the deviation between hair tracers is mainly Due to the environment, internal and external factors), there is no burden of collecting individual hair, broken hair or the like; and a device for measuring hair elasticity, thus completing the present invention. [Related technical documents] [Non-patent document] (Non-patent document 1) Swift, J.A. et al., Journal of the Association of Cosmetic Chemists (1972) Vol. 23, p. 695. (Non-Patent Document 2) Donald, E.D., et al., Journal of the Association of Cosmetic Chemists (1968) Vol. 19, p. 395. (Non-Patent Document 3) Humphreys, W.T. et al., Journal of the Association of Cosmetic Chemists (1972) Vol. 23, p. 359. (Non-Patent Document 4) Tate, M.L. et al., Journal of the Association of Cosmetic Chemists (1993) Vol. 44, p. 347.

One embodiment of the present invention relates to a method for quantitatively and reproducibly measuring hair elasticity using shape maintaining hair in a short time, and a method for measuring the hair elasticity improvement effect of a hair cosmetic composition using the same And a device for measuring hair elasticity.

In a general aspect, a method for measuring hair elasticity is provided, which includes: fixing the hair in an arch shape; and applying pressure to the fixed hair to measure the force when the arch shape is broken down.

The above method can be a non-invasive method that does not cause damage to the hair (such as collecting individual hair or the like), and the above method can be repeated using the same hair.

In the above method, the hair can be fixed by the first fixing part at one end and the second fixing part at the other end to form an arch shape, and it can be from the horizontal direction between the first fixing part and the second fixing part. The vertical apex of the center point exerts a force toward the center point. In this case, the force can be applied when the magnitude of the force is increased in the range of 0.001 to 50 Newtons (newton; N), and the magnitude of the force is increased by 0.001 Newton/sec, but the present invention is not limited to this.

In another general aspect, a device for measuring hair elasticity is provided, comprising: a fixing member that fixes the hair in an arched shape; and a measuring member that is equipped with a push-pull piston, the push-pull piston There is a groove at the end to measure the force when the arched shape of the fixed hair is broken down.

The push-pull piston can be operated while increasing the amount of force in the range of 0.001 to 50 Newtons (N).

In another general aspect, there is provided a method for measuring the effect of hair elasticity improvement by measuring the values before and after the treatment of the hair cosmetic composition to quantify the degree of hair elasticity improvement using the following methods: The method includes: the first step: selecting the position of the hair to be measured to fix the hair into an arch shape with a predetermined height and width; and the second step: applying force to the hair to measure the arch shape of the hair Force during decomposition.

The hair cosmetic composition may be one or more selected from the following groups: hair tonic, hair nourishing lotion, hair conditioner, hair conditioner, hair treatment agent, hair conditioner, shampoo, Shampoo, shampoo, hair styling agent, hair coloring agent, hair bleaching agent and the like, but it is not limited thereto.

The present invention relates to a method for measuring hair elasticity using shape retention pressure. Hereinafter, a method for quantitatively and visually measuring hair elasticity, a method for measuring the hair elasticity improving effect of a hair cosmetic composition using the same, and a device for measuring hair elasticity will be described. Here, unless otherwise defined, the technical terms and scientific terms used in this specification have general meanings understood by those skilled in the field to which the present invention relates, and are used for known functions and configurations that unnecessarily obscure the gist of the present invention The description of will be omitted in the following description.

Hair elasticity has the main characteristics that affect volume or hair styling, but at the same time it has high flexibility and hardness, which makes the definition of hair elasticity fuzzy and difficult to measure hair elasticity. Therefore, the applicant of the present invention tried to provide a very reliable measurement method by limiting the definition of hair elasticity to the maximum force required to maintain a specific arch shape, which is a combination of flexibility and hardness, taking into account the characteristics of the hair, and The hair elasticity is indicated as a numerical value, thereby completing the present invention.

The difference between the method of measuring hair elasticity according to the present invention and the existing method is that the method according to the present invention does not require a pretreatment process, such as the process of collecting individual hair to make hair strands or the like, so that it can be continuously and repeated To measure hair elasticity without the burden of collecting individual hair, hair breaks or the like.

In addition, the method for measuring hair elasticity according to the present invention has the following advantages: it is possible to temporarily fix a part of real human hair for measurement, and the degree of hair elasticity can be directly and quickly indicated as maintaining the condition of the hair product in use The numerical value.

In order to achieve the above-mentioned goal, the present invention provides a method for measuring hair elasticity, which includes: fixing the hair in an arch shape; and applying pressure to the fixed hair to measure the force when the arch shape is broken down.

Here, in the present invention, the "force when the arch shape is resolved" (means that when the pressure is continuously increased under pressure, the arch shape is not maintained but deformed when a force higher than a predetermined level is applied. The pressure at the time, and the pressure drops rapidly as illustrated in Fig. 1) can mean the maximum pressure F _max when the arch shape can be maintained.

The method for measuring hair elasticity according to the present invention can be an objective and visual measurement method and a non-invasive method, which is not accompanied by a pretreatment process (such as the process of collecting individual hair), so that the method can be easily used for product development, and It is possible to continuously perform tracking measurements on the same individual.

In the method for measuring hair elasticity according to the present invention, the hair can be fixed by the first fixing part at one end and the second fixing part at the other end, thereby forming an arch shape.

The hair can be selected variably depending on the purpose of the measurement, and any position of hair can be used as long as the length is sufficiently fixed. Here, it is better to use a hair position within 30 cm or less from the root of the hair, which is less exposed to the external environment and takes into account the hair growth rate (about 1 cm/month) to ensure the shortest length after growth, but this The invention is not limited to this. It is also preferable that the hair length required for fixing is also in the range of 0.5 to 30 cm, but the present invention is not limited to this. That is, it is possible to measure even on shorter hair (such as men's hair).

In addition, in order to mainly evaluate the new growth position, considering the fixed distance between the hair strands, it is better to use the measurement position of the hair strand within the range of 0.2 to 15 cm from the root of the hair, and more preferably use the range of 1 to 10 cm from the root of the hair Measure the position of the hair tress inside. In addition, in order to measure the degree of hair damage at the distal end of the hair, it can be measured within a range of 0.2 to 15 cm from the lowest end of the hair.

As the hair according to the exemplary embodiment of the present invention, considering the hair density and the measurement range, 1 to 300 hair strands in the above-mentioned range can be used. In view of measurement possibilities, ease of sample preparation, and low standard deviation, preferably 10 to 50 hair strands, and more preferably 10 to 30 hair strands may be used, but the number of hair strands is not limited thereto.

In the method of measuring hair elasticity according to an exemplary embodiment of the present invention, a force may be applied from the vertical vertex of the center point between the first fixing part and the second fixing part in the horizontal direction toward the center point. In this case, the force can be applied when increasing the magnitude of the force within the range of 0.001 to 50 Newtons (N) or 1 to 5 kg force, and the magnitude of the force is 0.001 Newton/sec or 1 gram force /Sec to increase, however, the magnitude and increase rate of force can be appropriately changed depending on the location to be measured and the purpose.

In addition, according to the present invention, it is possible to measure the hair elasticity before and after the treatment of the hair cosmetic composition by using the method for measuring hair elasticity according to the present invention as described above, so as to accurately predict and test the developed hair cosmetics How the composition affects the physical properties of the hair, such as hair elasticity, hair damage and the like. That is, it is possible to adopt the evaluation method by using the method of measuring hair elasticity according to the present invention to perform large-scale screening of hair elasticity improvement effect, hair damage repair effect, and the like, so that the method according to the present invention It can be importantly used in our company to develop product formulations and as a means to verify the quality of products available to our company and rival companies in the market.

The method of measuring the hair elasticity improvement effect can be by measuring the values before and after the treatment of the hair cosmetic composition to quantify the degree of hair elasticity improvement by using the following methods. The method includes: the first step: selecting to be measured Position the hair to fix the hair in an arch shape with a predetermined height and width; and the second step: apply a force to the hair to measure the force when the arch shape of the hair is decomposed. In this case, the method of measuring hair elasticity improvement effect mentioned above can be used to select a candidate hair cosmetic composition with a value equal to or greater than the value of hair elasticity before treatment, and it can also be compared with the available hair cosmetic composition. Quantitative comparative analysis.

In addition, because the deviations between hair tracers are mainly due to genes, environment, internal and external factors and the like, and the results vary greatly depending on the measurement location, in the existing analysis methods, try to improve the analysis The frequency, the number of samples, or the like can reduce the analysis error, but in the method for measuring the hair elasticity improvement effect according to the present invention, the hair of the same individual can be used repeatedly, and the influence of the factors described above can be minimized, thereby This makes it possible to provide very reliable quantitative values.

The method for measuring the effect of improving hair elasticity according to the present invention can have excellent reproducibility and can significantly shorten the analysis time. The hair cosmetic composition may be selected from the following: hair growth oil, hair nourishing lotion, hair conditioner, hair conditioner, hair treatment agent, hair conditioner, shampoo, shampoo, shampoo, hair Styling agents, hair coloring agents, hair bleaching agents and the like, but they are not limited thereto.

In addition, the present invention provides a device for measuring hair elasticity, comprising: a fixing member that fixes the hair in an arched shape; and a measuring member that is equipped with a push-pull piston, the push-pull piston having a recess at its end Groove to measure the force when the arched shape of the fixed hair is broken down.

According to an exemplary embodiment of the present invention, the fixing member (used to fix the hair in an arched shape) can fix the hair at an angle ranging from 5° to 180°, but the hair can also be determined in the range mentioned above depending on the purpose of measurement The outside angle is fixed.

The measurement member according to an exemplary embodiment of the present invention may include a processing part that uses a push-pull piston to pressurize; a pressure sensor part that measures pressure simultaneously with the pressurization in the processing part; and a self-pressure sensor The monitoring component of the pressure information received by the component.

Preferably, the push-pull piston installed in the measuring member according to the exemplary embodiment of the present invention has a single-sided or double-sided groove in a V-shaped, U-shaped, Y-shaped, X-shaped or similar shape, so as to remove hair The fixing is in an arched shape, so that the hair will not be pushed from one side to the other under pressure, but the push-pull piston is not limited to this.

In addition, the push-pull piston according to the exemplary embodiment of the present invention can be operated while increasing the magnitude of force in the range of 0.001 to 50 Newtons (N) or 1 to 5 kg force, and the magnitude of the force is 0.001 Newtons /Sec or 1 gram-force/sec, but it can be changed appropriately depending on the location and purpose to be measured.

Hereinafter, the present invention will be described in more detail with reference to the following examples. However, the following examples are provided only to help understand the present invention, but the scope of the present invention is not limited to the following examples. (Example 1)

After resting the individual in an artificial climate chamber (temperature: 23°C, humidity: 45% RH) for 30 minutes, use hair strands (approximately 3 cm, 15 strands) within 5 to 8 cm from the root of the hair to fix the hair It has an arch shape with a height of 1.5 cm. Subsequently, a push-pull piston is used to pressurize the hair while increasing the force from 0.001 Newton by 0.001 Newton/sec. In this case, force is applied from the apex of the arch shape in the vertical direction, and the pressure is measured simultaneously with the pressurization of the measuring member installed with the push-pull piston. After repeating the measurement of the force when the arched shape of the hair is broken down 30 times, the measured values are shown in Table 1 below. (Table 1)

As illustrated in Table 1, it can be confirmed that the method for measuring hair elasticity according to the present invention does not cause additional damage to the hair during the measurement, and its reproducibility is excellent despite repeating the measurement of hair 30 times. That is, it can be understood that it is possible to provide more reliable information about measuring the degree of hair damage by using simple operations and convenient methods of equipment, and to perform repeated measurements by using the method for measuring hair elasticity according to the present invention. (Example 2)

（表3）

Using 30 hair strands each from the hair of 13 individuals, the elasticity of the hair before treatment was measured by a method similar to that of Example 1. After that, the conditioner (0.1g conditioner/per 0.1g hair) prepared by the general method for preparing conditioner and having the composition described in Table 2 below was uniformly applied to the hair strands, and By a method similar to Example 1, the hair elasticity changed after the treatment was measured by repeating the measurement 15 times. Use the measured values to calculate the average and standard deviation before and after the treatment, thereby measuring the effect of improving hair elasticity (see Figure 2 and Table 3). (Table 2)

(table 3)

As illustrated in Table 3, since the elasticity of the hair before and after the use of the hair cosmetic composition was compared, it was confirmed that the elasticity was improved by 18.27% on average and significant results were obtained (p value of 0.001 or less). That is, the method for measuring the hair elasticity improvement effect according to the present invention can be used to quantitatively evaluate the hair elasticity improvement effect before and after using the hair cosmetic composition, so that the method according to the present invention can be used as an indicator when developing products Things.

According to the present invention, since the elasticity of the hair, which can serve as a criterion for the degree of hair damage, can be indicated as a numerical value, and can be evaluated without collecting individual hair or pretreating the hair, the same hair can be used depending on the hair treatment history. Evaluation so that hair elasticity can be used as a parameter that can continuously evaluate the effect of continuous use of the hair cosmetic composition, the change of hair elasticity due to hair growth, hair aging, and hair stress state.

In addition, in the method for evaluating hair elasticity according to the present invention, since hair elasticity can be directly measured in the human body, intervention effects depending on environmental factors can be minimized in the actual environment, thereby making it possible to provide Quantitative measurement method to reduce time and cost. In addition, it can be expected that the method according to the present invention will significantly contribute to the development of a product as a means of verifying quality.

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FIG. 1 is a graph illustrating the change value of the force exhibited when a hair having an arch shape deforms when a predetermined level of pressure is gradually applied to the hair in the method for evaluating hair elasticity according to the present invention. Fig. 2 is a graph illustrating the effect of improving hair elasticity measured in Example 2 according to the present invention.

Claims (8)

A method for measuring hair elasticity without a process of collecting individual hair includes: fixing the hair in an arched shape; and applying pressure to the fixed hair to measure the force when the arched shape is decomposed, wherein The hair is human hair. The method for measuring hair elasticity as described in the first item of the patent application, wherein the method for measuring hair elasticity is performed non-invasively and repeatedly using human hair. The method for measuring the elasticity of hair as described in item 2 of the patent application, wherein the hair is fixed by a first fixing part at one end and a second fixing part at the other end to form the arch shape, and The force is applied from the vertical vertex of the center point between the first fixing part and the second fixing part in the horizontal direction toward the center point. The method for measuring hair elasticity as described in item 3 of the scope of the patent application, wherein the force is applied when the magnitude of the force is increased in the range of 0.001 to 50 Newtons (N). The method for measuring hair elasticity as described in item 1 of the scope of patent application, wherein the length of the hair is 0.5 to 30 cm. The method for measuring hair elasticity as described in item 5 of the scope of patent application, wherein 1 to 300 hair strands are used as the hair. A method of measuring the improvement effect of hair elasticity by measuring hair The numerical value before and after the treatment of the cosmetic composition is used to quantify the degree of improvement in hair elasticity, including: selecting the position of the hair to be measured to fix the hair in an arch shape with a predetermined height and width. Step, the first step does not include the process of collecting individual hair; and the second step of applying force to the hair to measure the force when the arched shape of the hair is broken down, wherein the hair is human hair. The method for measuring hair elasticity improvement effect as described in item 7 of the scope of patent application, wherein the hair cosmetic composition is selected from the following group: hair growth oil, hair nourishing lotion, hair conditioner, hair care essence, hair treatment Agents, conditioners, shampoos, shampoos, shampoos, hair styling agents, hair coloring agents and hair bleaching agents.

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