CN111166679A

CN111166679A - Method for manufacturing beauty mask using sheet containing unrefined silk

Info

Publication number: CN111166679A
Application number: CN201910547964.0A
Authority: CN
Inventors: 赵祥佑; 李沅柏
Original assignee: Joysky Cosmetics Co Ltd
Current assignee: Joysky Cosmetics Co Ltd
Priority date: 2018-11-12
Filing date: 2019-06-24
Publication date: 2020-05-19
Also published as: KR101966915B1

Abstract

The method for manufacturing the beauty mask comprises the following steps: a step of preparing a sheet containing unrefined silk; preparing a dipping solution; a step of adding the sheet to the impregnation fluid to cause components including sericin in the sheet to bleed out to the impregnation fluid, thereby changing the pH, viscosity, and color of the impregnation fluid; and a step of suspending the change in pH, viscosity, and color of the impregnation liquid after a predetermined time has elapsed after the sheet is added to the impregnation liquid, thereby achieving a stable state.

Description

Method for manufacturing beauty mask using sheet containing unrefined silk

Technical Field

The present invention relates to a method for manufacturing a beauty mask using a sheet containing unrefined silk and a beauty mask manufactured by the manufacturing method. The beauty mask used in the present specification means a product manufactured for beauty purposes, and the sheet thereof may be applied to any part of the skin of a consumer, and covers a mask in which the sheet is applied to the facial skin of a consumer.

Background

Beautiful and clean skin is the focus of continuous attention of women, and recently, the skin beauty which is exclusive for women is expanded to men, and the attention on the skin beauty is greatly improved without distinguishing men, women, old and young.

Among various methods for contributing to beauty of skin, a method using a beauty mask is popular because it is inexpensive as compared with a prominent effect and its use method is simple. The beauty mask is manufactured by hermetically and waterproof packaging a dipping solution containing various ingredients helpful to skin health and a sheet immersed in the dipping solution, which is cut into various shapes according to the skin site to be applied, and the product is provided to consumers. A sheet for a cosmetic mask is generally a nonwoven fabric mainly made of a plant cellulose fiber such as cotton or pulp type, or a synthetic fiber such as nylon or dupont. The nonwoven fabric is formed in a felt form by being combined with a synthetic resin binder after being arranged in parallel or in a non-oriented manner without passing through a weaving process, and at the beginning, cotton or viscose fibers are mainly used as raw fibers, and then, synthetic fibers such as nylon, Polypropylene (PP), polyethylene terephthalate (PET), and the like are also used.

On the other hand, not only ingredients necessary for use as an impregnation fluid, i.e., ingredients such as solubilizing agents, emulsifiers, surfactants, pH adjusters, and thickening agents, which are generally used in cosmetics, but also various substances contributing to skin health have been studied. Among them, a substance called sericin is used as a substance contributing to skin health, and is also used as a component of a dipping solution for a beauty mask. Sericin is a component contained in silk obtained from silkworm cocoon. Silk obtained from silkworm cocoon comprises two proteins of silk fibroin and sericin, wherein silk fibroin is a protein constituting a fiber, and sericin is a protein surrounding two strands of silk fibroin. The sericin has an amino acid composition characteristic in that serine accounts for about 30% and the content of hydrophilic amino acid is high. In particular, sericin is known to be a material having an excellent skin moisturizing effect, similar in amino acid composition to natural moisturizing factors of the human body. In addition, sericin is known as a raw material capable of imparting silky smooth and full feeling to the skin. For use as a dip component of a cosmetic mask, sericin is used in the form of an extract or powder. Sericin has a problem in that the content of an active ingredient is low or much cost is incurred in the extraction or powdering process in the conventional use case.

The present inventors have long studied a method capable of more effectively utilizing the above sericin as an active ingredient of a cosmetic mask. As a result, the present inventors have made an unprecedented new idea. That is, unrefined silk is used as a sheet for a beauty mask. Since sericin is almost completely removed from the composition when silk is refined, when refined silk is used as silk for a beauty mask, a beauty effect based on sericin cannot be obtained without additionally adding sericin as in the prior art. The present inventors were the first to develop a mask manufacturing process capable of conveniently utilizing sericin components and saving manufacturing costs by selecting a sheet containing unrefined silk as a sheet of a beauty mask, and are expected to market natural sericin-containing beauty masks produced by such a mask manufacturing process at present on the day of filing. As described above, a way of using a sheet containing unrefined silk so as to be able to contain sericin as an effective ingredient of a cosmetic mask is a completely new attempt. Therefore, the present inventors have conducted various studies and experiments under conditions of adjusting pH, color, and viscosity, which affect the marketability of the finished cosmetic mask, to desired levels when using a sheet comprising unrefined silk, and finally completed a new cosmetic mask manufacturing process.

As related prior art documents, there are korean patent application No. 10-2015-0172384 (title of the invention: method for manufacturing cosmetic composition for facial mask comprising sericin extracted from mangosteen extract and golden silkworm cocoon), korean patent application No. 10-2003-0018086 (title of the invention: method for manufacturing sericin and facial mask using the same), korean patent application No. 10-2014-0136502 (title of the invention: method for manufacturing functional silk facial mask), and the like. These patent applications relate to facial masks, and disclose a composition containing sericin as an active ingredient, which is a natural silk ingredient, but in terms of the use of sericin, sericin obtained in the form of an extract is contained in a solution for soaking a facial mask, instead of obtaining sericin directly from unrefined silk as in the present invention.

Disclosure of Invention

An object of the present invention is to provide a novel method for manufacturing a beauty mask, which can use a sericin component of unrefined silk as an active ingredient of a beauty mask by using a sheet containing unrefined silk as a sheet of the beauty mask.

Another object of the present invention is to provide a novel beauty mask which is manufactured by the above-mentioned manufacturing method and which can stabilize the conditions of pH, color and viscosity, which affect the marketability of the beauty mask, well.

The method for manufacturing a beauty mask according to an embodiment of the present invention includes: a step of preparing a sheet containing unrefined silk; preparing a dipping solution; a step of adding the sheet to the impregnation fluid to cause components including sericin in the sheet to bleed out to the impregnation fluid, thereby changing the pH, viscosity, and color of the impregnation fluid; and a step of suspending the change in pH, viscosity, and color of the impregnation liquid after a predetermined time has elapsed after the sheet is added to the impregnation liquid, thereby achieving a stable state.

The preparation of the sheet containing unrefined silk refers to preparing the sheet by cutting the sheet material into a shape suitable for the intended use in a state where the unrefined silk content of the sheet material is greater than 0% and 100% or less, based on the weight ratio of the unrefined silk content.

In addition, the method for manufacturing a beauty mask or the beauty mask of the present invention may further include additional components.

According to the present invention, a novel method for manufacturing a beauty mask can be provided, which can use a sericin component of unrefined silk as an active ingredient of a beauty mask by using a sheet containing unrefined silk as a sheet of the beauty mask.

According to the present invention, a novel beauty mask which is produced by the above-described production method and which can stabilize the conditions of pH, color and viscosity, which affect the commercial value of the beauty mask, can be provided.

Drawings

FIG. 1 is a tabulation of the experimental results of example 1.

Fig. 2 is a graph showing the relationship between temperature and pH in a state where the weight% of gold silkworm cocoon is fixed in the experimental result of example 1.

Fig. 3 is a graph showing the relationship between the weight% and pH of gold silkworm cocoons in a state where the temperature is constant in the experimental result of example 1.

FIG. 4 is a tabulation of the experimental results of example 2.

Fig. 5 is a graph showing the change with time of pH in the presence or absence of a surfactant in the components of the immersion fluid in the experimental results of example 2.

Fig. 6 is a graph showing the change of color with time in the case where the content of the surfactant is different in the experimental result of example 2.

Fig. 7 is a table showing the final stable color in the case where the kind of the surfactant is different in the experimental results of example 2.

FIG. 8 is a tabulation of the experimental results of example 3.

Fig. 9 and 10 are collated tables of the experimental results of example 4.

Detailed Description

The detailed description of the invention that follows refers to the accompanying drawings that illustrate specific embodiments in which the invention can be practiced. These embodiments are described in detail so that those skilled in the art can fully practice the invention. The various embodiments of the invention, although different from each other, are understood not to be mutually exclusive. The following detailed description is, therefore, not to be taken in a limiting sense, and the scope of the present invention is defined by the appended claims, along with the full scope of equivalents to which such claims are entitled.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily practice the present invention.

I. Identification of factors causing changes in physical properties (pH, viscosity and color) of impregnation solution of cosmetic mask

The essential feature of the invention is the use of a sheet comprising unrefined natural silk. Although it is well known in the art that silk materials contain sericin components useful for skin beauty, a beauty mask has been conventionally manufactured by extracting sericin from unrefined silk and using the extract. The present inventors got rid of this manner, used a material comprising unrefined silk containing sericin as a sheet for a cosmetic mask, and a soaking liquid for soaking such sheet as an initial ingredient did not need to additionally contain sericin. As a result, the impregnation solution of the beauty mask prepared by the beauty mask manufacturing method newly proposed by the present inventors contained a large amount of sericin, because sericin components in a material containing unrefined natural silk exude into the impregnation solution over time. The physical properties of a commercial cosmetic mask should be maintained at least during the distribution phase. Representative physical properties that affect the commercial value of a cosmetic mask are pH, viscosity, color, and the like. Hitherto, there has been no disclosure of a production method capable of utilizing sericin contained in a material of unrefined natural silk and allowing distribution of the sericin while maintaining physical properties affecting the commercial properties of a cosmetic mask in a stable state. The present inventors have completed production conditions and methods under which the sericin component of unrefined natural silk can be stabilized well together with other components in the impregnation solution by conducting experiments in the following examples.

The basic raw materials constituting the cosmetic are roughly classified into solvents, moisturizers, skin cosmetic ingredients, thickeners, emulsifiers, surfactants, perfumes, pH adjusters, and the like. Among the raw materials that affect the stability of cosmetic products using materials containing unrefined silk are pH adjusters, surfactants, emulsifiers, and hydrotropes. The raw materials of cosmetics are classified into the above functions, but a single raw material may also exert multiple functions in terms of functions. For example, arginine is a substance commonly used as a cosmetic material. The substance is involved in the activity of synthesizing collagen in skin, and is a skin cosmetic component for caring healthy skin. But this substance is an amino acid which is a strong base and therefore also acts as a pH adjuster.

The main components of the silk are fibroin and sericin, wherein the sericin has the property of being dissolved in water. In particular, better dissolution was obtained when treated with hot water and dilute alkaline solution. When an impregnation-type cosmetic product is produced using a material containing unrefined silk, the impregnation liquid filled in the impregnation-type cosmetic product causes the components of the unrefined silk to exude. The exuded ingredients comprise the sericin described above. The exuded sericin can cause various changes in the physical properties of the filled impregnation fluid. Among them, the most representative physical properties affecting the merchantability of cosmetic products are pH, viscosity, color. The change in pH causes a change in viscosity. Since the change in viscosity due to a change in pH affects the feeling of use and irritation during use of the cosmetic product, the stability of pH is considered to be the most important consideration for the cosmetic product using the silk material.

On the one hand, the color of the natural silk mask material is determined by carotenoid pigments contained in sericin. That is, the color change of the impregnation fluid is related to the bleeding of sericin. The color change affects the merchantability in terms of the aesthetic, perceptive nature of the cosmetic product.

The pH of the silk material varies depending on the type and region of silkworm, whether wild silkworm is silkworm or silkworm, whether white silkworm or yellow silkworm, and the like. The final pH of the dip-type cosmetic product should be 5 to 9 according to the korean cosmetic safety management standards. The bleeding rate of sericin may be accelerated in a weakly alkaline solution, and thus the final pH of the dip-type cosmetic product is considered to be optimal at 5 to 7. In order to reduce skin irritation and exert the effect of the skin cosmetic ingredient of the cosmetic raw material, it is considered that the final pH of the product is more preferable at 5.5 to 6.5.

Hereinafter, example 1 will be described. In example 1, gold silkworm cocoons ("gold silks" which are varieties of the japanese silkworm 311(JS169) and the chinese silkworm 312(CS186) bred by cross breeding in the shaoxing parlor in rural areas, and yellow cocoons knotted from the "gold silks") were used, and 3 control groups were set. The first group comprises 100 parts by weight of purified water. The second group comprises 95 parts by weight of purified water and 5 parts by weight of golden silkworm cocoon. The third group comprises 90 parts by weight of purified water and 10 parts by weight of golden silkworm cocoon. The pH and color changes were observed as a function of temperature and time. The results are shown in fig. 1 to 3. FIG. 1 is a tabulation of the results of the experiment. In the table of FIG. 1, RT represents room temperature, and H represents time. Fig. 2 is a graph showing a relationship between temperature and pH in a state where the weight% of gold silkworm cocoon is fixed. Fig. 3 is a graph showing a relationship between the weight% of gold silkworm cocoon and pH in a state where the temperature is constant. The experimental results of example 1 are collated below.

First, in the combination of pure water and silkworm cocoons only, no color change of the pure water was observed. In addition, in the combination of purified water and silkworm cocoon, pH changes with the passage of time, and the higher the temperature, the faster the pH changes. In addition, in the combination of purified water and silkworm cocoons, the higher the weight% of the silkworm cocoons, the larger the pH change width.

The following is collated, and it can be seen from the experimental results of example 1: when the silkworm cocoon is soaked in purified water, the pH changes along with the change of time; the higher the temperature is, the faster the change speed is, the larger the ratio of the weight percent of the silkworm cocoon to the weight percent of the immersion liquid is, and the larger the change amplitude is; and after a predetermined time, the pH value is stabilized without any change, which is about 240 hours after the immersion, and is not related to the weight% of the silkworm cocoon. The time taken for the immersion to reach the stable state is more precisely described as about 240 hours under the condition of the weight% of the silkworm cocoon to the weight% of the immersion liquid used in the immersion type cosmetic mask.

Next, example 2 will be explained. In example 2, the same gold silkworm cocoon as used in example 1 was used. The weight% of the gold silkworm cocoon was fixed to 5 wt%. 4 control groups were set. The first group comprises 95 parts by weight of 100% purified water and 5 parts by weight of gold silkworm cocoon. The second group comprises 95 parts by weight of a mixture of polysorbate 80 and purified water and 5 parts by weight of golden silkworm cocoon. The third group comprises 95 parts by weight of a mixture of polysorbate 20 and purified water and 5 parts by weight of golden silkworm cocoon. The fourth group comprises 95 weight parts of mixture of PEG 60-hydrogenated castor oil and purified water, and 5 weight parts of golden silkworm cocoon. In the group containing the surfactant, the composition% of the surfactant was changed in three stages of 0.1%, 1%, and 2%. In addition, at the beginning of the experiment, a predetermined amount of a pH adjusting agent was added so that the pH of each control group was the same as that of purified water. The pH and color were observed as a function of time. The results are shown in fig. 4 to 7. FIG. 4 is a tabulation of the results of the experiment. In the table of fig. 4, regarding the color, the degree of relative change in color was digitalized by setting colorless and transparent to 0 and the color of the gold silkworm cocoon used to 9. Fig. 5 is a graph showing the change in pH with time in the presence or absence of a surfactant in the components of the immersion fluid. Fig. 6 is a graph showing the change in color with time in the case where the content of the surfactant is different. Fig. 7 is a table showing the final stable color in the case where the surfactant type is different. The experimental results of example 2 are collated below.

First, the change in pH of the surfactant-containing group was observed to be faster than that of the group containing 100% purified water. The rate of change of pH varies depending on the type of surfactant, but the difference is not so large that the final stabilized pH value is equal when silkworm cocoons of the same content are immersed, regardless of the type of surfactant and the presence or absence of the surfactant. As described above, in example 2, when the kind of the surfactant used was different, the difference in the pH change rate was not large. However, the higher the emulsifying ability value of the surfactant, the faster the pH change speed, and when the surfactant used is a nonionic surfactant, the influence of the HLB value (hydrophilic-lipophilic balance) of the raw material is exerted. Depending on the HLB value, meaningful differences may arise. When the HLB value is large, the pH change speed is high, and when the HLB value is small, the pH change speed is low.

In addition, the present inventors found the following facts: the higher the content of the surfactant, the faster the color of the silkworm cocoon seeps into the impregnation liquid, and as for the degree of the seeping-out, the higher the content of the surfactant, the more the color seeps out, and is stabilized at a darker color. In addition, the degree of color bleeding of the silkworm cocoon into the impregnation liquid varies depending on the kind of the surfactant, which can be confirmed from the final stable color. It is understood that although the change in the color of the immersion liquid is influenced by the type and content of the surfactant as described above, the time required for stabilization to a specific color is approximately 160 hours, which is shorter than the time required for stabilization of the pH observed in example 1. In addition, it is clear that the color change of the immersion liquid is not related to the change of pH.

Next, example 3 will be explained. In example 3, the same gold silkworm cocoons as those used in examples 1 and 2 were used. In example 3, the change in viscosity of the immersion liquid was observed as a focus. The weight% of the gold silkworm cocoon was fixed to 5 wt%. 6 control groups were set. The first group comprises 95 parts by weight of 100% pure water and 5 parts by weight of gold silkworm cocoon, and the pure water does not contain a thickening agent. The second to sixth groups contained 95 parts by weight of a mixture of purified water containing the same weight% (0.3%) of different thickeners and 5 parts by weight of gold silkworm cocoon. The thickeners of the second to sixth groups are all water-soluble thickeners, carbomer, hydroxyethyl cellulose, xanthan gum, carrageenan and cellulose gum are used respectively. In the same manner as in example 2, at the start of the experiment, a certain amount of a pH adjusting agent was added so that the pH of the control group was the same as that of purified water. The pH and viscosity were observed as a function of time. The results are shown in FIG. 8. The experimental results of example 3 are collated below.

From the results of example 3, it is understood that the pH and viscosity of the impregnation liquid change with time, and the viscosity of the impregnation liquid is increased by the use of the water-soluble thickener. It was confirmed that the viscosity changed with the change in pH. The specification of the use of each thickener raw material used in example 3 states that the viscosity number is stable at a pH of 5 to 8. However, as can be confirmed from the experimental results of example 3, when the pH value was changed between 5 and 8, the viscosity value was not stabilized, and changed with the change in pH.

The viscosity greatly affects the marketability of the finished beauty mask. This is because even a slight difference in viscosity may cause a great difference in feeling of use. From the experimental results of example 3, the pH increased from 6 to less than 8, with which a change in viscosity was observed in all thickeners used, and therefore the final target value for the viscosity should be determined according to the final stable pH of the impregnation liquor. When a material containing unrefined silk is used as a sheet for a beauty mask, the pH of the impregnation solution changes from the pH at the start of impregnation as the silk component (including sericin) exudes, and becomes stable at a specific pH (see the results of examples 1 and 2). From the results of example 3, the dependency of viscosity on pH was confirmed, and thus the viscosity at the beginning of impregnation should not be the target viscosity of the final product.

The target viscosity value of the impregnation fluid is set based on the stabilized pH value, taking into account the final stabilized pH value of the impregnation fluid. That is, the immersion liquid is set to reach the target viscosity value when the immersion liquid has the final stabilized pH value. It is necessary to select or use a thickener or a thickener content which allows the impregnation fluid to reach a target viscosity value when it has a final pH value after stabilization (although a single thickener may be used as the thickener, it may be used in a state in which a plurality of thickeners are mixed). The viscosity of the impregnation solution before the start of impregnation may vary depending on the pH adjuster. As described above, a pH adjuster may be added to the impregnation solution before the sheet is added to the impregnation solution. By adding a pH regulator, the pH of the impregnation solution is changed. Thereby, the viscosity of the impregnation liquid before the start of the impregnation is changed to the viscosity after the change.

Next, example 4 will be explained. The same gold silkworm cocoons as used in the previous embodiment were used in embodiment 4. In example 4, the final pH and viscosity changes based on the initial pH and the content of silk material and the final pH and viscosity changes were observed. The two tables are shown in fig. 9 and 10, respectively, as the results of example 4. In fig. 9 and 10, the amounts of the impregnation liquids are different. The table of fig. 9 records the change of pH and viscosity with time when 1.0g and 2.0g of silk material were impregnated in 20g of impregnation solution, respectively. The table of fig. 10 records the change of pH and viscosity over time when 1.0g and 2.0g of silk material were impregnated in 40g of impregnation solution, respectively. In the experiments of fig. 9 and 10, the components of the immersion liquid were the same. The impregnation liquid used was a mixture of 94.8 parts by weight of purified water, 0.2 parts by weight of hydroxyethyl cellulose, and 5.0 parts by weight of glycerin. Here, a small amount of pH adjuster was added to set the pH initial conditions to 4.00, 5.00, and 6.00, respectively. An impregnation solution prepared by mixing 94.8 parts by weight of purified water, 0.2 parts by weight of hydroxyethyl cellulose and 5.0 parts by weight of glycerin at a pH of 5.90, which is a standard pH of a general impregnation-type cosmetic mask of the applicant company, had a viscosity of 400 cP. The experimental results of working up example 4 are as follows:

first, it was confirmed that the initial pH before the silk material was impregnated in the impregnation solution affected the pH of the finished beauty mask product obtained by impregnating the silk material in the impregnation solution. In addition, it was confirmed that the larger the amount of silk material added (comparing the case of 1.0g silk material with the case of 2.0g silk material), the larger the change width of pH value. It was also confirmed that the amount of the silk material was the same, and the pH value was changed less as the amount of the impregnation solution was increased (comparing the results in the table of fig. 9 and the table of fig. 10). From the results of example 3, it was found that the viscosity of the immersion liquid was dependent on the pH, and from the results of example 4, it was again confirmed that the viscosity was almost the same at the same pH even though the conditions were different.

Based on the results confirmed by the experiment, a new method for manufacturing a cosmetic mask is proposed

The important matters identified from the results of examples 1 to 4 are summarized as follows.

1. When unrefined silk is impregnated, the silk component containing sericin exudes, thereby changing the pH of the impregnation solution.

2. This change in pH is influenced by the content of unrefined silk material and steep liquor.

The pH value change was stopped after a predetermined time had elapsed, and then the pH value was maintained at a fixed value.

4. The viscosity of the impregnation solution depends on the pH. The pH changes within a prescribed time after the start of the impregnation, and therefore the viscosity value also changes, and when the pH is stabilized, the viscosity value is also stabilized.

5. The color of the impregnation liquid changes depending on the type and amount of the surfactant contained in the impregnation liquid, changes during a predetermined period of time, and then stabilizes and does not change.

In view of the above, the present inventors have introduced a method for producing a cosmetic mask as follows.

In general, the manufacturing method includes at least 4 steps. The first step is a step of preparing a sheet comprising unrefined silk. Here, the preparation of the sheet containing unrefined silk refers to the preparation of the sheet by cutting the sheet material into a shape suitable for the purpose of using the sheet material in a state where the unrefined silk content of the sheet material is more than 0% and 100% or less, based on the weight ratio of the content. The second step is a step of preparing an impregnation liquid. The third step is a step of adding the sheet to the impregnation fluid, and bleeding out components of the sheet into the impregnation fluid, thereby changing the pH, viscosity, and color of the impregnation fluid. In the third step of adding the sheet to the impregnation fluid, sealing of a cosmetic mask product may be performed. The fourth step is a step of stopping the change in pH, viscosity, and color of the impregnation liquid and bringing the impregnation liquid to a stable state after a predetermined time has elapsed after the sheet is added to the impregnation liquid.

The method for manufacturing a beauty mask of the present invention may further comprise additional steps. Such additional steps are steps included after the step of reaching the steady state. This additional step is a step of confirming whether the steady state has been achieved by an experiment, and is a step of comparing the pH, viscosity, and color of the immersion liquid of the selected sample with set values. A prescribed number of samples can be selected in a cosmetic mask manufactured at the same time. The selected sample is unsealed and the pH, viscosity and color of the dip are compared to the steady state set points as described above. If the comparison result confirms that the stable state is reached, the product is delivered, and if the stable state is not reached, the product can wait for the additional time length and then perform the additional check.

Among them, it is important to set the pH and viscosity of the impregnation liquid before the start of impregnation. The setting must take into account that the pH of the impregnation fluid before the addition to the sheet changes with the content of the sheet and the impregnation fluid during the period in which the pH becomes stable after the lapse of the prescribed time. If the pH of the impregnation fluid before the addition to the sheet is set to the target pH of the final product, the pH in the final product is different from the target pH due to the pH change during the stabilization step, which affects the viscosity in addition to the pH, and thus may deteriorate the marketability of the beauty mask product actually used by the consumer, and in the worst case, may cause problems to the skin of the consumer due to pH and viscosity values exceeding the recommended ranges, and may cause significant compensation. Therefore, the pH of the impregnation fluid before addition to the sheet should be set to be different from the target pH. More specifically, the pH of the impregnation solution before the addition of the sheet was specifically deviated from the target pH by a value previously set through repeated experiments with the unrefined silk material and the content of the impregnation solution set as variables. The content of unrefined silk material and the steeping liquor is set as variables, but these are not meant to be the only variables and other conditions are not considered. The present inventors tried to impregnate a sheet containing unrefined silk to manufacture a beauty mask, and finally found that the content of unrefined silk material and impregnation liquid causes a change in pH of the impregnation liquid, but it should not be denied that other factors affecting the kind of silk material and the exudation of other silk material components also cause a change in pH of the impregnation liquid. The deviation may vary depending on the conditions of the silk material and the content of the impregnation liquid, etc., and thus the scope of the present invention should not be limited to a specific deviation. On the other hand, the viscosity of the impregnation liquid before the sheet is added is necessarily considered, and the viscosity changes with the change in the pH of the impregnation liquid when the sheet is stable after the predetermined time has elapsed. More specifically, according to the results of experiments conducted by the present inventors, the viscosity is almost solely dependent on the pH, and therefore when the thickener included in the impregnation fluid is selected, a thickener capable of adjusting the viscosity value of the impregnation fluid to a target viscosity value at a target pH value is selected. For the above reasons, the viscosity set value of the immersion liquid before the start of immersion of the thickener is different from the target viscosity value.

Preferably, the impregnation fluid comprises a pH adjuster. In example 4 described above, it was confirmed that the initial pH value of the impregnation liquid before the start of impregnation affects the final pH. Of these, it is important that the pH of the impregnation solution before the start of impregnation, which is adjusted by the pH adjuster, is not the target pH. As described above, the pH of the impregnation fluid changes by a certain deviation amount when it becomes stable. The pH of the impregnation fluid adjusted by the pH adjuster functions to set the pH before the start of the change and does not affect the amount of change in pH. In the case where the impregnation fluid contains a pH adjuster, the step of adjusting the pH of the impregnation fluid becomes a part of the impregnation fluid preparation step.

In addition, it was confirmed from the above example 2 that the target color of the impregnation liquid differs depending on the kind and content of the surfactant. The type and content of the surfactant are preferably selected in consideration of this point, and the step of determining the type and content of the surfactant contained in the impregnation fluid becomes a part of the impregnation fluid preparation step.

Although the method for manufacturing a beauty mask, which is a characteristic of the present invention, has been described above, the beauty mask manufactured by the method for manufacturing the beauty mask itself has a characteristic different from the conventional art. The beauty mask of the present invention comprises a sheet comprising unrefined silk and a soaking solution. The impregnation liquid contains a sericin component exuded from the sheet comprising unrefined silk or components of various amino acids constituting sericin, which is an inherent feature of the present invention and is not possessed by any cosmetic mask until the present invention.

The present invention has been described specifically with reference to specific matters such as constituent elements, and to the embodiments and drawings, but this is provided only to facilitate a more complete understanding of the present invention, and the present invention is not limited to the embodiments described above, and various changes and modifications can be made by those skilled in the art based on these descriptions.

Therefore, the scope of the present invention is not limited to the embodiments described above, and the claims and all modifications equivalent to or equivalent to the claims are included in the scope of the present invention.

Claims

1. A method for preparing a facial mask for skin care,

the method comprises the following steps:

a step of preparing a sheet comprising unrefined silk,

a step of preparing an impregnation liquid,

a step of adding the sheet to the impregnation fluid to cause components including sericin in the sheet to bleed out to the impregnation fluid, thereby changing the pH, viscosity, and color of the impregnation fluid,

after the sheet is added to the impregnation liquid, the change of the pH, viscosity and color of the impregnation liquid is stopped after a predetermined time, and the sheet is in a stable state;

in the step of preparing the impregnation liquid, a pH regulator, a thickener and a surfactant are added to the impregnation liquid,

adjusting the pH at the start of impregnation by the pH adjuster so that the pH before addition to the sheet has a prescribed deviation from a target pH,

the predetermined deviation is a value preset by taking the weight percent of the unrefined silk and the steeping liquor in the sheet as a variable,

the viscosity of the impregnation liquid changes with the change of the pH of the impregnation liquid, the type and content of the thickener are selected so that the viscosity of the impregnation liquid has a target viscosity at a target pH,

the kind and weight% of the surfactant are selected in consideration of the target color.

2. The method of manufacturing a cosmetic mask according to claim 1, wherein,

an additional step is included after the step of reaching the steady state,

the adding step is a step of confirming whether the steady state is achieved through experiments, and is a step of comparing the pH, viscosity and color of the immersion liquid of the selected sample with set values.

3. The method of manufacturing a cosmetic mask according to claim 2,

sealing is performed in the step of adding the sheet to the impregnation liquid.