JP7382416B2 - human skin model kit - Google Patents

Description

The present disclosure relates to a human skin model kit.

BACKGROUND ART Conventionally, when cosmetics are sold in stores, it has been proposed to use a human skin model kit in order to make it easier to understand changes in skin condition before and after using the cosmetics. Specifically, we will use a human skin model that simulates the state of human skin before using skin care products (lotion, emulsion, serum, moisturizing cream, mask, beauty oil, etc.) and use skin care products for 2 weeks to 1 month. It is proposed that a human skin model kit be created by combining the product with a human skin model that simulates the condition of the skin after a certain amount of use, and that sales staff use this human skin model kit to explain the product at stores. (For example, Patent Document 1).

Japanese Patent Application Publication No. 2011-053609

By the way, skin care products are particularly effective on the epidermal layer of the skin in the short term, and when skin care products are used, the viscoelasticity of the epidermal layer changes.

However, in the human skin model kit described in Patent Document 1, there is a human skin model that simulates the state before using the skin care product and a human skin model that simulates the state after using the skin care product, and basically the material of the human skin model is It is thought that the entire structure has been changed. For this reason, with such human skin model kits, customers were unable to experience changes in the tactile sensation of human skin due to changes in the viscoelasticity of only the epidermal layer. In other words, with such human skin model kits, it was not always possible to properly experience the short-term effects of skin care products.

In view of the above problems, an object of the present disclosure is to provide a human skin model kit that allows users to experience changes in the tactile sensation of human skin due to changes in the viscoelasticity of only the epidermal layer.

The gist of the present disclosure is as follows.

(1) A human skin model kit comprising a plurality of artificial human skin models imitating human skin, each human skin model comprising a base layer and a surface layer provided on the surface of the base layer, and the base layers are the same. , wherein the surface layers are formed to have different viscoelasticities from each other.
(2) The human skin model kit according to (1) above, wherein in each human skin model, the elastic modulus of the surface layer is larger than the elastic modulus of the base layer.
(3) The human skin model kit according to (1) or (2) above, wherein the human skin model is made of urethane polymer or silicone.
(4) The human skin model kit according to any one of (1) to (3) above, wherein the display related to the viscoelasticity of each human skin model is arranged side by side with the corresponding human skin model.

According to the present disclosure, a human skin model kit is provided that allows users to experience changes in the tactile sensation of human skin due to changes in the viscoelasticity of only the epidermal layer.

FIG. 1 is a schematic perspective view of the human skin model kit according to the first embodiment. FIG. 2 is a schematic cross-sectional side view of the human skin model kit according to the first embodiment. FIG. 3 is a schematic cross-sectional side view similar to FIG. 2 of the human skin model kit according to the second embodiment. FIG. 4 is a schematic perspective view similar to FIG. 1 of a human skin model kit according to the third embodiment. FIG. 5 is a schematic cross-sectional side view similar to FIG. 2 of the human skin model kit according to the third embodiment. FIG. 6 is a diagram showing the evaluation results for three samples with different storage moduli of the surface layer.

Hereinafter, embodiments will be described in detail with reference to the drawings. In addition, in the following description, the same reference number is attached to the same component.

<First embodiment>
≪Composition of human skin model kit≫
FIG. 1 is a schematic perspective view of a human skin model kit 1 according to the first embodiment. FIG. 2 is a schematic cross-sectional side view of the human skin model kit 1 according to the first embodiment. The human skin model kit 1 is used, for example, when explaining cosmetic products at a store so that customers can experience the difference in skin texture before and after using a skin care product. As shown in FIGS. 1 and 2, the human skin model kit 1 includes a support plate 10 and a plurality of human skin models 20 and 30 provided on the support plate 10. In this embodiment, the human skin model kit 1 is provided with two human skin models, a first human skin model 20 and a second human skin model 30. In this embodiment, the human skin model kit 1 includes the support plate 10, but a flexible sheet such as silicone may be used instead of the support plate 10. Alternatively, the human skin model kit 1 may not include the support plate 10. In this case, the plurality of human skin models are used by being placed on a desk, for example.

The support plate 10 is made of cardboard or a resin such as polyethylene or polystyrene. In this embodiment, the support plate 10 is formed as a plate without unevenness. However, the support plate 10 may be formed to have the same number of recesses as the number of human skin models 20, 30 arranged on its upper surface. In this case, each recess has a shape complementary to the bottom shape of the human skin models 20 and 30.

Further, on the support plate 10, displays 12 and 13 regarding the properties of the corresponding human skin models 20 and 30 are provided adjacent to and alongside each of the human skin models 20 and 30.

In the example shown in FIG. 1, the first human skin model 20 is formed to imitate the state of human skin before using the skin care product. In particular, in this embodiment, the elastic modulus of the surface layer is smaller than the elastic modulus of the surface layer of the second human skin model 30, as will be described later. Therefore, on the support plate 10, in the vicinity of the first human skin model 20, the words "before use" and "elasticity: small" regarding the properties of the first human skin model 20 are written. On the other hand, the second human skin model 30 is formed to imitate the state of human skin after using the skin care product. In particular, in this embodiment, the shape is formed to imitate the state of human skin after using a skin care product containing a component that hardens the epidermis (component that increases the elasticity of the epidermis). Therefore, as will be described later, the elastic modulus of the surface layer of the second human skin model 30 is larger than the elastic modulus of the surface layer of the first human skin model 20. Therefore, on the support plate 10, in the vicinity of the second human skin model 30, the words "after use" and "elasticity: large" regarding the properties of the second human skin model 30 are written.

In addition, as will be described later, in the case of skin care products that contain ingredients that soften the epidermis (components that reduce the elasticity of the epidermis), the elastic modulus of the surface layers 21 and 31 is the same as that of the second surface layer 31. is formed to be smaller than the elastic modulus of the first surface layer 21. Therefore, in such a case, the words "before use" and "elasticity: large" are written on the support plate 10 near the first human skin model 20. Additionally, in this case, the words "After use" and "Elasticity: Small" are written near the second human skin model 30.

Further, the display provided on the support plate 10 may be a display in other forms, such as numerical values or charts, as long as it includes a display regarding the properties of each human skin model 20, 30. The display regarding the human skin models 20, 30 includes at least one of the following: display regarding whether or not a skin care product has been used, display regarding the type of skin care product used, display regarding the usage period of the skin care product, and display regarding viscoelasticity. Alternatively, the support plate 10 may not be provided with such a display.

The human skin models 20 and 30 are formed to imitate human skin (skin), and are formed to have a thickness of 2 to 200 mm, 2 to 100 mm, 2 to 50 mm, or 2 to 10 mm. Furthermore, the human skin models 20 and 30 have a laminated structure similar to human skin. In this embodiment, the human skin models 20 and 30 include surface layers 21 and 31 and base layers 22 and 32, respectively, as shown in FIG. The surface layers 21 and 31 are formed to imitate the epidermis of human skin, and the base layers 22 and 32 are formed to imitate the dermis or subcutaneous tissue of human skin.

Specifically, the first human skin model 20 includes a first surface layer 21 and a first base layer 22, and the second human skin model 30 includes a second surface layer 31 and a second base layer 32. In this embodiment, the base layers 22 and 32 are formed in a cylindrical shape, and one end surface (bottom surface) thereof is adhered to the upper surface of the support plate 10. Furthermore, surface layers 21 and 31 are provided on the opposite end surfaces (upper surfaces) of the base layers 22 and 32. Note that when the human skin models 20 and 30 are fitted into the recesses provided in the support plate 10, the base layers 22 and 32 do not need to be adhered to the support plate 10. Further, the base layers 22 and 32 may be formed as rectangular parallelepipeds.

In this embodiment, the surface layers 21 and 31 are formed using a urethane polymer, for example, a dry urethane polymer (i.e., a one-component urethane polymer or a two-component urethane polymer) as a main component. . In particular, it is preferable that the surface layers 21 and 31 be formed using a one-component urethane polymer as a main component. As the one-component urethane, any type of urethane including lacquer type, moisture curing type, and block isocyanate curing type can be used. This one-component urethane polymer can be used by dissolving it in a solvent, specifically an organic solvent in which methyl ethyl ketone, ethyl acetate, dioxane, toluene, isopropyl alcohol, dimethylformamide, tetrahydrofuran, etc. are appropriately combined as necessary. can. In addition to urethane, the surface layers 21 and 31 may contain additives such as foaming agents, surfactants, flame retardants, fillers, pigments, stabilizers, mold release agents, catalysts, etc., as necessary. You can stay there.

As the two-component urethane, for example, a urethane formed by a main reaction between isocyanate and polyol can be used. Examples of the isocyanate include polymeric MDI, pitolylene diisocyanate TODI, diphenylmethane diisocyanate MDI, dianisidine isocyanate DADL, and paraphenylene diisocyanate PPDI. Examples of polyols include polyether-based polypropylene glycol PPG, polytetramethylene ether glycol PTMG, and polymer polyols; ester-based polycarbonate esters, adipate polyols, polycaprolactone polyols, and polycarbonate polyols; other polybutadiene polyols, Examples include acrylic polyols.

The surface layers 21 and 31 are formed to have a thickness of 3 to 200 μm, 5 to 100 μm, or 10 to 50 μm. Additionally, grooves may be formed on the upper surfaces of the surface layers 21 and 31 (the surfaces on the opposite side to the base layers 22 and 32), imitating the texture formed on the surface of human skin. Specifically, on the upper surfaces of the surface layers 21 and 31, the length of the groove corresponding to the side of the triangular texture is 3 to 200 μm, 5 to 100 μm, or 10 to 50 μm, and the depth of the groove is 5 to 50 μm. The grooves may be formed to be 200 μm, 10-100 μm or 15-50 μm. Furthermore, the irregularities formed on the upper surfaces of the surface layers 21 and 31 do not necessarily have to be grooves imitating triangular textures. Therefore, for example, an uneven shape may be formed on the upper surfaces of the surface layers 21 and 31 by performing texturing using a blasted mold.

Further, the first surface layer 21 and the second surface layer 31 are formed to have different viscoelasticities from each other. For example, the first surface layer 21 and the second surface layer 31 are configured to have different contents of the main agent and curing agent, and as a result, have different viscoelasticities. Alternatively, the first surface layer 21 and the second surface layer 31 have different types of urethane polymers, and as a result, have different viscoelasticities. In the example shown in FIG. 1, the surface layers 21 and 31 are formed such that the first surface layer 21 has a larger elastic modulus than the second surface layer 31.

Note that the viscoelasticity of the surface layer of each human skin model varies depending on the type of skin care product for which the human skin model kit is used to allow customers to experience changes in the tactile sensation of human skin before and after use. For example, in the case of a skin care product containing an ingredient that softens the epidermis, as in this embodiment, the elastic modulus of the second surface layer 31 is higher than that of the first surface layer 21. It is formed so that the elastic modulus is smaller than that of . On the other hand, when targeting skin care products containing ingredients that harden the epidermis (components that increase the elasticity of the epidermis), the surface layers 21 and 31 should be such that the elastic modulus of the second surface layer 31 is the first. The elastic modulus of the surface layer 21 is larger than that of the surface layer 21 .

The base layers 22 and 32 are formed mainly of a urethane polymer, for example, a dry urethane polymer as described above (ie, a one-component urethane polymer or a two-component urethane polymer). Further, the base layers 22 and 32 may be formed using a dry foaming type urethane polymer as a main component. In this embodiment, the first base layer 22 and the second base layer 32 are formed identically.

As described above, the surface layers 21 and 31 are formed to imitate the epidermis of human skin, and the base layers 22 and 32 are formed to imitate the dermis or subcutaneous tissue. Therefore, in each of the human skin models 20 and 30, the surface layers 21 and 31 are formed such that their elastic modulus is larger than that of the base layers 22 and 32. Furthermore, the surface layers 21 and 31 may be formed so that their viscosity coefficients are equal to or different from those of the base layers 22 and 32.

In this embodiment, both the surface layers 21 and 31 and the base layers 22 and 32 are formed mainly of urethane-based polymer. However, the surface layers 21, 31 and the base layers 22, 32 may be formed of other materials such as silicone, as long as they can be formed to imitate human skin. Further, in this embodiment, grooves imitating the texture are formed on the upper surfaces of the surface layers 21 and 31, but such grooves may not be formed.

≪Manufacturing method≫
A method of manufacturing the human skin model kit configured as described above will be explained. In manufacturing the human skin model kit described above, first, an evaluation test is conducted on the target skin care product. In the evaluation test, for example, a skin care product is used on a plurality of panels, and changes in the viscoelasticity of human skin before and after using the skin care product are detected.

Specifically, before using skin care products, the values of parameters related to skin viscoelasticity (e.g., elastic coefficient and viscosity coefficient; hereinafter referred to as "viscoelastic parameters") of each panel are measured, and the measured values are The average value for all panels is calculated. Then, after using the skin care product once, several times, or over a period of time, the values of skin viscoelastic parameters for each panel are measured in the same way, and the average value of the measured values for all panels is calculated. be done. Then, the difference between the average value before using the skin care product and the average value after using the skin care product is calculated.

The surface layer for the human skin model is created by taking into account the differences calculated by the evaluation test. Specifically, the surface layer for the first human skin model and the surface layer for the second human skin model are made such that the difference in their viscoelastic parameter values matches the difference calculated in the evaluation test. , created.

On the other hand, the base layer is created identically for both the first human skin model and the second human skin model. A human skin model is created by adhering the surface layer created as described above onto the base layer created in this manner. The created human skin model is glued onto a support plate to create a human skin model kit.

<Second embodiment>
Next, referring to FIG. 3, a human skin model kit 1 according to a second embodiment will be described. The structure of the human skin model kit 1 according to the second embodiment is basically the same as the structure of the human skin model kit according to the first embodiment. In the following, points different from the structure of the human skin model kit according to the first embodiment will be mainly explained. FIG. 3 is a schematic cross-sectional side view similar to FIG. 2 of the human skin model kit 1 according to the second embodiment.

In this embodiment, the base layer is divided into two parts: upper base layers 22a, 32a and lower base layers 22b, 32b. Therefore, as shown in FIG. 3, the human skin models 20 and 30 each include surface layers 21 and 31, upper base layers 22a and 32a, and lower base layers 22b and 32b. The surface layers 21 and 31 are formed to imitate the epidermis of human skin, the upper base layers 22a and 32a are formed to imitate the dermis of human skin, and the lower base layers 22b and 32b are formed to imitate the subcutaneous tissue of human skin. be done.

The upper base layers 22a and 32a are formed to have a thickness of 0.5 to 4 mm. Further, the lower base layers 22b and 32b are formed to have a thickness of 1 to 100 mm. In this embodiment, the lower base layers 22b and 32b are formed in a cylindrical shape, and one end surface (bottom surface) thereof is adhered to the upper surface of the support plate 10. Further, the opposite end surfaces (top surfaces) of the lower base layers 22b, 32b are adhered to one end surface (bottom surface) of the upper base layers 22a, 32a. Surface layers 21 and 31 are provided on the opposite end surfaces (upper surfaces) of the upper base layers 22a and 32a.

The upper base layers 22a, 32a and the lower base layers 22b, 32b are formed to have different viscoelasticities from each other. Specifically, in this embodiment, the elastic modulus of the upper base layers 22a, 32a is larger than the elastic modulus of the lower base layers 22b, 32b. Further, the viscosity coefficients of the upper base layers 22a and 32a may be formed to be equal to or different from the viscosity coefficients of the lower base layers 22b and 32b.

In this embodiment, by making the laminated structure of the human skin model closer to the laminated structure of human skin in this way, the tactile sensation when a customer touches the human skin model can be made closer to the actual tactile sensation of human skin. In addition, although each human skin model is formed with a laminated structure of three layers in this embodiment, it may be formed with a laminated structure of four or more layers.

<Third embodiment>
Next, a human skin model kit 1 according to a third embodiment will be described with reference to FIGS. 4 and 5. The structure of the human skin model kit 1 according to the third embodiment is basically the same as the structure of the human skin model kit according to the first and second embodiments. In the following, points different from the configurations of the human skin model kits according to the first embodiment and the second embodiment will be mainly explained.

FIG. 4 is a schematic perspective view similar to FIG. 1 of the human skin model kit 1 according to the third embodiment. Moreover, FIG. 5 is a schematic cross-sectional side view similar to FIG. 2 of the human skin model kit 1 according to the third embodiment. As shown in FIG. 4, the human skin model kit 1 according to the present embodiment includes three human skin models: a first human skin model 20, a second human skin model 30, and a third human skin model 40. In this embodiment, the first human skin model 20 is formed to imitate the state of human skin before using the skin care product. Further, the second human skin model 30 and the third human skin model 40 are formed to imitate the state of human skin after using the skin care product for a short period of time and after using it for a long period of time, respectively.

As shown in FIG. 5, also in this embodiment, the first human skin model 20 has the first surface layer 21 and the first base layer 22, and the second human skin model 30 has the second surface layer 31 and the second base layer 32. The third human skin model 40 includes a third surface layer 41 and a third base layer 42, respectively.

The first surface layer 21, the second surface layer 31, and the third surface layer 41 are formed to have different viscoelasticities from each other. In the example shown in FIG. 4, the surface layers 21, 31, and 41 are formed such that the elastic modulus increases in the order of the first surface layer 21, the second surface layer 31, and the third surface layer 41.

In addition, in this embodiment, on the support plate 10, in the vicinity of the first human skin model 20, characters such as "before use" and "elasticity: small" regarding the properties of the first human skin model 20 are written. . Further, on the support plate 10, in the vicinity of the second human skin model 30, characters such as "after short term use" and "elasticity: medium" are written regarding the properties of the second human skin model 30. Further, on the support plate 10, in the vicinity of the third human skin model 40, characters such as "After long-term use" and "Elasticity: High" regarding the properties of the third human skin model 40 are written.

Note that in the above embodiment, a plurality of human skin models may be used to imitate human skin that has been used for the same skin care product for different periods of time. However, for example, a plurality of human skin models may be used to imitate human skin after using different skin care products. Further, in the above embodiment, the human skin model kit includes three human skin models, but the human skin model kit may include four or more human skin models.

Although the preferred embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and various modifications and changes can be made within the scope of the claims.

Using multiple human skin models in which only the storage modulus of the surface layer was changed, we verified the relationship between the storage modulus of the surface layer and the tactile sensation when pressing the human skin model.

In the verification, three human skin model samples with different storage moduli of the surface layer were used. The storage elastic modulus of the surface layer was measured using a dynamic viscoelasticity measurement device DVA-220 manufactured by IT Keizai Control Co., Ltd. The storage moduli of the surface layers of the three samples A, B and C were 25.3 MPa, 13.1 MPa and 4.4 MPa, respectively. In addition, elastic models manufactured by Beaulux were used for the base layers of all three samples.

Ten female evaluators evaluated the firmness of these three samples. In the evaluation of firmness, a ranking method was used in which each evaluator ranked the articles in descending order of firmness. The results are shown in FIG. As can be seen from FIG. 6, the evaluators felt that the higher the storage modulus, the more firm the skin, and thus the more youthful the skin. That is, it was found that even if the base layers were the same, the feeling of firmness felt by the evaluator changed when only the viscoelasticity of the surface layer was different from each other.

1 Human skin model kit 10 Support plate 20 First human skin model 21 First surface layer 22 First base layer 30 Second human skin model 31 Second surface layer 32 Second base layer

Claims (3)

A human skin model kit comprising a plurality of human skin models imitating human skin,
Each human skin model includes a base layer and a surface layer provided on the surface of the base layer, the base layer is formed to be the same, and the surface layer is formed to have different viscoelasticity with respect to each other ,
The human skin model kit , wherein the thickness of the surface layer is 3 to 200 μm, and the elastic modulus of the surface layer is larger than the elastic modulus of the base layer. The human skin model kit according to claim 1 , wherein the human skin model is made of urethane polymer or silicone. The human skin model kit according to claim 1 or 2 , wherein the display related to the viscoelasticity of each human skin model is arranged side by side with the corresponding human skin model.

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