A friction device and evaluation method for evaluating the friction resistance effect of cosmetics

Abstract

The present invention belongs to the technical field of cosmetics, and discloses a friction device and evaluation method for evaluating the friction resistance effect of cosmetics, wherein the friction device comprises a gripping unit, a power supply unit, and a friction unit, wherein the friction unit has a friction body and a third shell that is semi-enclosed by the friction body, wherein the third shell is connected to the second shell of the power supply unit by a fixed collar, and a rotating shaft is provided on the side of the friction body close to the power supply unit, wherein the rotating shaft is mechanically connected to the power output shaft of the motor, and the friction device can adjust the opening and closing of the friction unit and the rotation speed of the friction unit through a function button. During the friction operation of the present application, the rotation speed of the friction unit is constant and controllable, thereby ensuring the uniformity of friction during the friction operation.

Description

Technical Field

[0001] The present invention belongs to the technical field of cosmetics, and more specifically, relates to a friction device and an evaluation method for evaluating the friction resistance effect of cosmetics. Background Art

[0002] Sunscreen and facial makeup have become necessities in the daily lives of many consumers. Based on the particularity of sunscreen and facial makeup categories, in addition to meeting the basic skin feel and texture requirements, the durability of the effect is also an important aspect that cannot be ignored. According to the survey results of Mintel Industry Trend Report, the top three characteristics of sunscreen products that consumers are most interested in are: long-lasting sunscreen, additional skin care effects, and high sun protection factor (China Beauty and Personal Care Innovation Atlas: Sunscreen, July 2023); the top three factors that influence consumers' makeup purchases are: light and breathable, long-lasting and non-smearing, and good concealing power (China Beauty and Personal Care Innovation Atlas: Facial Makeup, May 2023). In summary, the long-term effect of sunscreen and the durability of makeup are both the focus of consumers. In order to meet market demand, various brands have launched concepts such as "long-lasting makeup", "not easy to rub makeup", "waterproof and sweat-proof", "anti-rub", "resistant to rub and lasting", "long-lasting and friction-resistant", and "not easy to fall off due to friction".

[0003] At present, the main factors that affect the durability of sunscreen or base makeup products include self-oil, sweat, and scratches and friction caused by the external environment. For sunscreen products, the 2015 edition of the "Technical Specifications for Safety of Cosmetics" strictly stipulates the method for measuring its waterproof performance, providing a basis for claims. Patent KR101526270B1 measures the sweat resistance and sebum resistance of makeup by coating artificial leather with samples to evaluate the lasting effect of makeup. Related studies also describe an in vitro test method for the anti-sweat and long-lasting effect of base makeup products ("An in vitro test method for the anti-sweat and long-lasting effect of base makeup products", Qian Shumin et al., "Fragrance and Fragrance Cosmetics", April 2019). The above are all in vitro test evaluation method studies. There is currently no mature evaluation method for the shedding of sunscreen or base makeup products after application caused by scratching and friction. For example, the Chinese patent application with publication number CN111110591A provides a water-based liquid cosmetic, which is applied on the arm, rubbed with the fingertips, and visually observed to evaluate the friction resistance of the makeup; the Chinese patent application with publication number CN105769613A provides a liquid cosmetic material, which is drawn on the wrist, rubbed with a dry cotton swab on the liquid cosmetic material application area, and visually evaluated by the coating peeling. However, the above-mentioned prior art related to the evaluation of the friction resistance of sunscreen or base makeup products has technical problems such as uncontrollable friction uniformity during the friction operation, and the friction resistance effect evaluation method relies on visual inspection and lacks quantitative evaluation basis.

[0004] Therefore, it is urgent to propose a friction device and an evaluation method for evaluating the friction resistance effect of cosmetics to solve the technical problems existing in the above-mentioned prior art. Summary of the invention

[0005] The main purpose of the present invention is to propose a friction device and evaluation method for evaluating the friction resistance of cosmetics, aiming to solve at least one of the technical problems that the existing technologies related to the friction resistance evaluation of existing sunscreen or foundation products have the problem that the friction uniformity is uncontrollable during the friction operation, and the friction resistance evaluation method relies on visual inspection and lacks quantitative evaluation basis.

[0006] To achieve the above objectives, in a first aspect, the present invention provides a friction device for evaluating the friction resistance effect of cosmetics, the friction device comprising:

[0007] A gripping unit, wherein the gripping unit has a first shell on the outside and a function button protruding from the first shell, a single-chip microcomputer is arranged inside the first shell, and the function button is connected to the single-chip microcomputer via a DuPont line;

[0008] A power supply unit, the power supply unit has a second shell on the outside, the power supply unit has a motor, an energy storage battery and a charging connector, the charging connector is embedded in the second shell, the charging connector, the energy storage battery and the motor are electrically connected in sequence, and the motor has a power output shaft;

[0009] A friction unit, wherein the friction unit comprises a friction body and a third shell semi-surrounding the friction body, wherein the third shell is connected to the second shell of the power supply unit via a fixed collar, and a rotating shaft is provided on a side of the friction body close to the power supply unit, and the rotating shaft is mechanically connected to the power output shaft of the motor; wherein the friction device can adjust the opening and closing of the friction body and the rotation speed of the friction body through a function button.

[0010] Preferably, the friction body comprises:

[0011] A base, the base is disc-shaped and has a central protrusion and a peripheral protrusion on one side, the other side of the base is fixedly connected to the rotating shaft, the central protrusion has an inner cavity, a through hole connected to the inner cavity is provided on the side of the central protrusion away from the rotating shaft, and a bending portion is provided on the side of the peripheral protrusion away from the rotating shaft, and the bending direction of the bending portion is toward the central protrusion;

[0012] A telescopic rod, one end of which is slidably disposed in the inner cavity, and the other end of which extends out from the through hole;

[0013] A compression spring wrapped around the outer circumference of the end of the telescopic rod extending from the through hole;

[0014] A rigid load body, the rigid load body is in an "Ω" shape, and one end of the telescopic rod extending from the through hole is rotatably hinged to the top of the inner side of the rigid load body;

[0015] a friction material layer, the friction material layer being detachably attached to the outer surface of the rigid load body;

[0016] Among them, when the friction body is in a non-working state, the outer edge of the "Ω"-shaped rigid load body is interlocked with the bent portion of the peripheral protrusion, and the two ends of the compression spring are respectively abutted and fixed to the central protrusion and the inner side of the rigid load body, and the compression spring is in a compressed state.

[0017] Preferably, the friction material layer is made of non-woven fabric.

[0018] Preferably, the friction material layer has a gram weight of 35 to 100 g / m 2 The longitudinal and transverse bending lengths are ≤4.5cm, the longitudinal and transverse breaking strengths under dry conditions are ≥15N, the color fastness to dry friction is ≥level 4, and the surface roughness Ra is 10-30μm.

[0019] Preferably, the fixing ring is a hard plastic part.

[0020] In a second aspect, the present invention further provides a method for evaluating the anti-friction effect of cosmetics, the evaluation method comprising the following steps:

[0021] Step S1: Setting and cleaning the application area before applying the cosmetic to be tested, selecting N test areas on the inner skin of the forearms of both hands of qualified subjects and marking them, N ≥ 1 and is an integer, and cleaning the N test areas;

[0022] Step S2: Apply the cosmetics to be tested evenly to the N test areas by manual application, and control the application amount of the cosmetics to be tested to be 2.0±0.1mg / cm 2 ;

[0023] Step S3: Data collection after the cosmetics to be tested are applied, and the brightness values ​​of the N test areas after the cosmetics to be tested are collected. , red and green values and blue-yellow value ;

[0024] Step S4: rubbing the cosmetics to be tested, using the friction device to perform the same friction operation on the N test areas 15 to 30 minutes after the step S3 is completed;

[0025] Step S5: Data collection after the cosmetics to be tested are rubbed, and the lightness values ​​of the N test areas after the cosmetics to be tested are collected. , red and green values and blue-yellow value ;

[0026] Step S6: Calculate the skin color difference value, calculate the skin color difference value after the cosmetic to be tested is applied and after the cosmetic to be tested is rubbed ΔE , the skin color difference ΔE The calculation formula is as follows:

[0027] ;

[0028] Step S7: Skin color difference value ΔE Color difference with preset value ΔE 1 For comparison, if ΔE < ΔE 1 , the cosmetics to be tested have a friction-resistant effect; if ΔE > ΔE 1 , the cosmetics to be tested do not have a friction-resistant effect.

[0029] Preferably, in step S1, when N≥2 and is an integer, the N test areas are spaced at least 1 cm apart from each other.

[0030] Preferably, in step S2, when the manual application method is adopted, the application personnel need to wear latex gloves.

[0031] Preferably, the friction operation refers to uniformly contacting and rubbing the friction device with the test area for a friction time of 20 to 40 seconds.

[0032] Preferably, the preset color difference value ΔE 1 The value range is 0~2.

[0033] Preferably, the preset color difference value ΔE 1 The value range is 1~2.

[0034] Compared with the prior art, the present invention has the following beneficial effects:

[0035] 1. A friction device for evaluating the friction resistance of cosmetics of the present invention uses a friction device to perform a friction operation on the cosmetics. During the operation, the rotation speed of the friction unit is constant and controllable, thereby ensuring the friction uniformity during the friction operation;

[0036] The structural setting of the friction body allows the rigid load body with the friction material layer attached to have a telescopic margin. When the friction device is used to perform a friction operation on the cosmetics, the operator needs to keep the rigid load body with the friction material layer attached to contact the skin with the cosmetics applied; when the resistance force applied by the operator is large, the end of the telescopic rod slidingly arranged in the inner cavity retracts, and the rigid load body is retracted together, so that the resistance force between the rigid load body with the friction material layer attached to the skin is maintained in an appropriate range, and the rotation speed fluctuation of the friction body is controlled within a stable range; thereby avoiding the situation where the rotation speed of the friction body is damaged due to excessive resistance, resulting in the inability to accurately perform the cosmetics friction operation.

[0037] 2. A method for evaluating the anti-friction effect of cosmetics according to the present invention quantifies the color difference under the CIE Lab color space model. The calculation formula is used for the skin color difference value between the skin color after the cosmetics to be tested are applied and after the cosmetics to be tested are rubbed. If the change in the skin color difference value makes the skin color difference between the cosmetics to be tested after rubbing and after the cosmetics to be tested are very small, so that professionals cannot distinguish the difference, or only professionals can distinguish the difference, then it means that the change in the skin color difference value is very small, that is, the cosmetics to be tested has a friction-resistant effect; otherwise, the cosmetics to be tested does not have a friction-resistant effect; thereby improving the existing friction-resistant effect evaluation method of sunscreen or foundation products that relies on visual inspection and lacks a quantitative evaluation basis into a friction-resistant effect evaluation method with a standardized operating procedure, quantitative test results and judgment basis. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 This is a schematic diagram of a friction device for evaluating the friction resistance effect of cosmetics in one embodiment of the present invention;

[0039] Figure 2 This is a schematic diagram of a friction device for evaluating the friction resistance effect of cosmetics in one embodiment of the present invention when no resistance force is applied between the friction body and the skin;

[0040] Figure 3 This is a schematic diagram of a friction device for evaluating the friction resistance effect of cosmetics in one embodiment of the present invention when a resistance force is applied between the friction body and the skin;

[0041] Figure 4 This is a schematic structural diagram of a friction body of a friction device for evaluating the friction resistance effect of cosmetics in one embodiment of the present invention;

[0042] Figure 5 This is a schematic diagram of the operation flow of a method for evaluating the anti-friction effect of cosmetics in another embodiment of the present invention;

[0043] Figure 6This is a schematic diagram of evaluating the friction resistance effect of a sunscreen product in another embodiment of the present invention (T0 before application, T1 after application, T2 after friction);

[0044] Figure 7 This is a schematic diagram of evaluating the friction resistance effect of a foundation product in another embodiment of the present invention (T0 before application, T1 after application, T2 after friction). DETAILED DESCRIPTION

[0045] Various aspects of the present invention are described in further detail below.

[0046] Unless otherwise defined or indicated, all professional and scientific terms used herein have the same meanings as those familiar to users skilled in the art. In addition, any methods and materials similar or equivalent to those described herein can be applied to the method of the present invention.

[0047] Unless otherwise clearly specified and limited, the "or" mentioned in the present invention includes the relationship of "and". The "and" is equivalent to the Boolean logic operator "AND", the "or" is equivalent to the Boolean logic operator "OR", and "AND" is a subset of "OR".

[0048] It is to be understood that although the terms "first", "second", etc. may be used herein to describe different elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another element. Therefore, a first element may be referred to as a second element without departing from the teachings of the present disclosure.

[0049] In the present invention, the terms "consisting mainly of" and "consisting of" are included in the terms "containing", "including" or "comprising".

[0050] Unless otherwise clearly specified and limited, the terms "connected", "connected" and "connected" in the present invention should be understood in a broad sense, for example, it can be a fixed connection, or it can be connected through an intermediary medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technical users in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0051] For example, if an element (or component) is referred to as being on, coupled to, or connected to another element, the element may be directly formed on, coupled to, or connected to the other element, or there may be one or more intervening elements between them. In contrast, if the expressions "directly on," "directly coupled to," and "directly connected to" are used herein, then no intervening elements are indicated. Other words used to describe the relationship between elements should be similarly interpreted, such as "between" and "directly between," "attached" and "directly attached," "adjacent" and "directly adjacent," etc.

[0052] It should also be noted that the words "front", "rear", "left", "right", "upper" and "lower" used in the following description refer to directions in the drawings. The words "inner" and "outer" used refer to directions toward or away from the geometric center of a particular component, respectively. It can be understood that these terms are used here to describe the relationship of one element, layer or region relative to another element, layer or region as shown in the drawings. In addition to the orientations described in the drawings, these terms should also include other orientations of the device.

[0053] Other aspects of the present invention will be apparent to users skilled in the art in view of the disclosure herein.

[0054] In order to more clearly illustrate the embodiments of the present disclosure or the technical solutions in the prior art, the specific implementation methods of the present invention will be described below with reference to the accompanying drawings. Obviously, the drawings described below are only some embodiments of the present invention. For users of ordinary skills in the field, other drawings and other implementation methods can be obtained based on these drawings without creative work.

[0055] It should also be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present disclosure. The drawings only show the components related to the present application and are not drawn according to the number, shape and size of the components in actual implementation. The type, quantity and proportion of each component in actual implementation may be changed arbitrarily, and the component layout may also be more complicated. For example, the thickness of the components in the drawings may be exaggerated for the sake of clarity.

[0056] The existing technologies related to the friction resistance evaluation of existing sunscreen or foundation products all have technical problems that the friction uniformity during the friction operation is uncontrollable, and the friction resistance effect evaluation method relies on visual inspection and lacks a quantitative evaluation basis.

[0057] In order to solve the above technical problems in the prior art, as shown in the attached Figures 1 - 4As shown, on the one hand, the present invention provides a friction device for evaluating the friction resistance effect of cosmetics, the friction device comprising:

[0058] A gripping unit 1, wherein the gripping unit 1 has a first shell on the outside, and a function button 4 protruding from the first shell, a single-chip microcomputer is arranged inside the first shell, and the function button 4 is connected to the single-chip microcomputer via a DuPont line;

[0059] A power supply unit 2, wherein the power supply unit 2 has a second shell on the outside, and the power supply unit 2 has a motor, an energy storage battery and a charging connector, wherein the charging connector is embedded in the second shell, and the charging connector, the energy storage battery and the motor are electrically connected in sequence, and the motor has a power output shaft;

[0060] The friction unit comprises a friction body 3 and a third shell semi-surrounding the friction body 3, wherein the third shell is connected to the second shell of the power supply unit via a fixing collar 3′, and a rotating shaft 5 is provided on the side of the friction body 3 close to the power supply unit 2, wherein the rotating shaft 5 is mechanically connected to the power output shaft of the motor; wherein the friction device can adjust the opening and closing of the friction body and the rotation speed of the friction body 3 via a function button 4.

[0061] It should be noted that the friction device is used to rub the cosmetics, and the rotation speed of the friction body is constant and controllable during the operation, which ensures the friction uniformity during the friction operation. In addition, the rotation speed can also be set to three gears: high speed, medium speed, and low speed, thereby providing a richer selection of test scenarios for the evaluation test of the friction resistance of cosmetics.

[0062] As a preferred embodiment, the friction body 3 includes:

[0063] A base 6, the base is disc-shaped and has a central protrusion 7 and a peripheral protrusion 8 on one side, the other side of the base is fixedly connected to the rotating shaft 5, the central protrusion 7 has an inner cavity 9, a through hole connected to the inner cavity 9 is provided on the side of the central protrusion 7 away from the rotating shaft 5, and a bending portion is provided on the side of the peripheral protrusion 8 away from the rotating shaft 5, and the bending direction of the bending portion is toward the central protrusion 7;

[0064] A telescopic rod 10, one end of which is slidably disposed in the inner cavity 9, and the other end of which extends out from the through hole;

[0065] A compression spring 11, the compression spring 11 is wrapped around the outer circumference of the end of the telescopic rod 10 extending from the through hole;

[0066] A rigid load body 12, wherein the rigid load body 12 is in an "Ω" shape, and one end of the telescopic rod 10 extending from the through hole is rotatably hinged to the top of the inner side of the rigid load body 12;

[0067] The friction material layer 13 is detachably attached to the outer surface of the load body 12; wherein, when the friction body 3 is in a non-working state, the outer edge of the "Ω"-shaped rigid load body 12 is interlocked with the bent portion of the peripheral protrusion 8, and the two ends of the compression spring 11 are respectively abutted and fixed to the central protrusion 7 and the inner side of the rigid load body 12, and the compression spring 11 is in a compressed state.

[0068] It should be noted that, as Figures 2 - 4 As shown, the structural setting of the friction body allows the rigid load body with the friction material layer attached to have a telescopic margin. When the friction device is used to perform a friction operation on the cosmetics, the operator needs to keep the rigid load body with the friction material layer attached to contact the skin with the cosmetics applied; when the resistance force applied by the operator is large, the end of the telescopic rod slidingly arranged in the inner cavity retracts, and the rigid load body is retracted together, so that the resistance force between the rigid load body with the friction material layer attached to the skin is maintained in an appropriate range, and the rotation speed fluctuation of the friction body is controlled within a stable range; thereby avoiding the situation where the rotation speed of the friction body is damaged due to excessive resistance, resulting in the inability to accurately perform the cosmetics friction operation.

[0069] It should be noted that the outer top surface of the rigid load body is substantially horizontal, and this setting is to enable it to make uniform contact with the skin as much as possible when it is loaded with a friction material layer, rather than partial contact. In addition, the rigid load body can be made of stainless steel or environmentally friendly hard plastic.

[0070] As a preferred embodiment, the friction material layer 13 is made of non-woven fabric.

[0071] As a preferred embodiment, the friction material layer 13 has a gram weight of 35 to 100 g / m 2 The longitudinal and transverse bending lengths are ≤4.5cm, the longitudinal and transverse breaking strengths under dry conditions are ≥15N, the color fastness to dry friction is ≥level 4, and the surface roughness Ra is 10-30μm.

[0072] As a preferred embodiment, the fixing ring is a hard plastic part.

[0073] Second, as attached Figure 5 As shown, the present invention also provides a method for evaluating the anti-friction effect of cosmetics, the evaluation method comprising the following steps:

[0074] Step S1: Setting and cleaning the application area before applying the cosmetic to be tested, selecting N test areas on the inner skin of the forearms of both hands of qualified subjects and marking them, N ≥ 1 and is an integer, and cleaning the N test areas;

[0075] Step S2: Apply the cosmetics to be tested evenly to the N test areas by manual application, and control the application amount of the cosmetics to be tested to be 2.0±0.1mg / cm 2 ;

[0076] Step S3: Data collection after the cosmetics to be tested are applied, and the brightness values ​​of the N test areas after the cosmetics to be tested are collected. , red and green values and blue-yellow value ;

[0077] Step S4: rubbing the cosmetics to be tested, using the friction device to perform the same friction operation on the N test areas 15 to 30 minutes after the step S3 is completed;

[0078] Step S5: Data collection after the cosmetics to be tested are rubbed, and the lightness values ​​of the N test areas after the cosmetics to be tested are collected. , red and green values and blue-yellow value ;

[0079] Step S6: Calculate the skin color difference value, calculate the skin color difference value after the cosmetic to be tested is applied and after the cosmetic to be tested is rubbed ΔE , the skin color difference ΔE The calculation formula is as follows:

[0080] ;

[0081] Step S7: Skin color difference value ΔE Color difference with preset value ΔE 1 For comparison, if ΔE < ΔE 1 , the cosmetics to be tested have a friction-resistant effect; if ΔE > ΔE 1 , the cosmetics to be tested do not have a friction-resistant effect.

[0082] It should be noted that the International Commission on Illumination (CIE) proposed the CIE Lab color space model, in which Lab consists of a brightness channel and two color channels. Indicates brightness, The larger the value, the brighter it is. The smaller the value, the darker it is; Represents red and green, in polar coordinates, Values ​​from negative to positive represent the evolution of color from green to red; Represents blue and yellow, in polar coordinates, Values ​​from negative to positive represent the progression of color from blue to yellow.

[0083] In the CIE Lab color space model, the color difference value The calculation formula is:

[0084] ,in,

[0085] is the brightness difference between the reference color and the measured color, is the red-green difference between the reference color and the measured color, is the blue-yellow difference between the reference color and the measured color. For this application, the reference color is the color after smearing. It should be noted that in this application, the applicant found that the quantitative color difference under the CIE Lab color space model The calculation formula is used for the skin color difference between the cosmetics to be tested after being applied and the cosmetics to be tested after being rubbed, which can solve the technical problem that the friction resistance evaluation method in this field has long relied on visual inspection and lacked a quantitative evaluation basis. If the change in the skin color difference value makes the skin color difference between the cosmetics to be tested after being rubbed and the cosmetics to be tested after being applied very small, so that professionals cannot distinguish the difference, or only professionals can distinguish the difference, it means that the change in the skin color difference value is very small, that is, the cosmetics to be tested has a friction resistance effect; otherwise, the cosmetics to be tested do not have a friction resistance effect.

[0086] In addition, in the preset color difference value ΔE 1 In the setting, the applicant based on industry-related experimental verification data (Mokrzycki WS, Tatol M. Color difference Delta E - A survey, 2011): Value 0 to 1, cannot be distinguished; Values ​​1 to 2, which can be identified by professionals; Values ​​of 2 to 3.5 can be identified by non-professionals; Values ​​of 3.5 to 5 can be identified; The value is greater than 5, which is clearly distinguished; therefore, the preset color difference value ΔE 1 The value range is 0~2, preferably, the preset color difference value ΔE 1 The value range is 1~2.

[0087] It should be noted that the aforementioned value, value, value, value, value, The collection method of the value is set to non-contact collection of the skin, thereby avoiding the collection process from affecting the state of the cosmetics after application or friction. value, value, value, value, value, The value acquisition device is a device based on image acquisition. Preferably, the acquisition device is a device that uses ultraviolet light or orange light as a light source to perform image acquisition.

[0088] Therefore, the applicant improved the existing friction resistance evaluation method of sunscreen or foundation products that relies on visual inspection and lacks quantitative evaluation basis into a friction resistance evaluation method with standardized operating procedures, quantitative test results and judgment basis.

[0089] As a preferred implementation, in step S1, when N≥2 and is an integer, the N test areas are spaced at least 1 cm apart from each other.

[0090] As a preferred embodiment, in step S2, when the manual application method is adopted, the application personnel need to wear latex gloves.

[0091] As a preferred embodiment, the friction operation refers to uniformly contacting and rubbing the friction device with the test area for a friction time of 20 to 40 seconds.

[0092] Example 1

[0093] (1) Subject selection

[0094] Inclusion criteria:

[0095] 1. Aged between 18 and 60;

[0096] 2. No allergic diseases, no history of allergies to cosmetics and other external preparations;

[0097] 3. The skin color of the inner forearms of both hands is healthy, without skin diseases and factors that affect the test;

[0098] 4. Be able to understand the experimental process, voluntarily participate in the experiment and sign the written informed consent form, and comply with the testing procedures.

[0099] Exclusion criteria:

[0100] 1. Women who are planning to become pregnant, pregnant, breastfeeding or within six months after giving birth;

[0101] 2. Those with severe systemic diseases, immunodeficiency or autoimmune diseases;

[0102] 3. Those who have used antihistamines in the past week or immunosuppressants in the past month;

[0103] 4. The test area has scars, pigmentation, atrophy, port-wine stains or other blemishes that may affect the test results;

[0104] 5. Those who have participated in other clinical trials in the trial area in the past three months;

[0105] 6. Patients with respiratory diseases who are receiving treatment;

[0106] 7. People who are receiving skin treatment;

[0107] 8. Patients with insulin-dependent diabetes;

[0108] 9. Other corresponding exclusion criteria.

[0109] (2) Testing process

[0110] Step S1: Setting and cleaning the application area before applying the cosmetics to be tested, selecting and marking several test areas on the inner forearm skin of both hands of multiple qualified subjects, and cleaning the several test areas of the qualified subjects with dry paper towels, and placing the subjects in a room with a temperature of 21±2°C and a humidity of 50±10%RH to sit and balance for 30 minutes;

[0111] It should be noted that, in order to increase the contrast, VISIA-CR images of the several test areas before the cosmetics to be tested are also collected here;

[0112] Step S2: Apply the cosmetics to be tested. The tester manually applies several kinds of cosmetics to be tested evenly to the test area, and controls the application amount of the cosmetics to be tested to be 2.0±0.1mg / cm 2 ;

[0113] Step S3: Data collection after the cosmetics to be tested are applied, the tester performs VISIA-CR image collection on the test areas of the subject after the cosmetics to be tested are applied;

[0114] Step S4: rubbing the cosmetics to be tested, using the friction device to perform the same friction operation on the plurality of test areas 15 to 30 minutes after the step S3 is completed, and the friction time is set to 20 seconds;

[0115] Step S5: Data collection after the cosmetics to be tested are rubbed, and the tester collects VISIA-CR images of the several test areas of the test subject after the cosmetics to be tested are rubbed;

[0116] (3) Data analysis process

[0117] The VISIA-CR images collected in steps S3 and S5 were analyzed using IPP software. value, value, value, value, value, The value is calculated, and the skin color difference value is further calculated ΔE ,Will ΔE The color difference value ΔE 1 For comparison, in this embodiment, there are 30 qualified subjects, and the preset color difference value ΔE 1 The cosmetics to be tested are of two types, namely sunscreen lotion 1 and sunscreen lotion 2, and their relevant data statistics are shown in Table 1.

[0118] Table 1.

[0119]

[0120] As shown in Table 1, the color difference between sunscreen lotion 1 after rubbing and after application =3.39>2, then this sunscreen lotion 1 does not have the effect of friction resistance; the color difference between sunscreen lotion 2 after friction and after application =3.44>2, then this sunscreen lotion 2 does not have the effect of friction resistance. Figure 6 .

[0121] Example 2

[0122] In this embodiment, the subject selection and testing process are the same as in Example 1, and the VISIA-CR images acquired in the above steps S3 and S5 are analyzed using IPP software. value, value, value, value, value, The value is calculated, and the skin color difference value is further calculated ΔE ,Will ΔE The color difference value ΔE 1 For comparison, in this embodiment, there are 36 qualified subjects, and the preset color difference value ΔE 1 is 2.

[0123] The type of cosmetics to be tested is a liquid foundation 1, and its relevant data statistics are shown in Table 2.

[0124] Table 2.

[0125]

[0126] As shown in Table 2, the color difference between the foundation liquid 1 after rubbing and after application is ΔE=1.95<2, so the foundation liquid 1 has a friction resistance effect. Figure 7 .

[0127] Example 3

[0128] The operation process is the same as that of Example 2. The reliability and stability of the evaluation method of the present application can be verified by comparing the results of different testers. If the comparison results of different testers are consistent and within the set deviation range, it indicates that the evaluation method of the present application has ideal reliability and stability.

[0129] The comparison deviation can be set according to the requirements of each laboratory, and it is recommended that the error range be controlled between 5% and 20%. The test results of the testers compared in this embodiment meet the requirements if the error does not exceed 10%.

[0130] The formula for comparison deviation of testers is as follows:

[0131] ,in,

[0132] X—Tested by Tester A ;

[0133] Y—Tested by Tester B ;

[0134] min(X, Y) - the minimum value of the test results X and Y of the two inspectors.

[0135] Testers A and B used the method of the present invention to test the friction resistance effect of the test liquid foundation 1. The test results are shown in Table 3.

[0136] Table 3.

[0137]

[0138] As shown in Table 3, the color difference between the rubbing and smearing of Liquid Foundation 1 by tester A is ΔE=1.95<2, and Liquid Foundation 1 has a friction-resistant effect; the color difference between the rubbing and smearing of Liquid Foundation 1 by tester B is ΔE=1.98<2, and Liquid Foundation 1 has a friction-resistant effect. The judgment results of testers A and B are consistent, and the comparison deviation is 1.54%, which meets the requirements, indicating that the evaluation method of this application has ideal reliability and stability.

[0139] Example 4

[0140] The operation process is the same as that of Example 2, and the friction resistance effect of the same sample is measured multiple times by using the method of the present invention in the same environment. The repeatability error range can be set according to the requirements of each laboratory, and it is recommended that the error range be controlled between 5% and 20%. In this embodiment, the error is not more than 10% to meet the requirements.

[0141] The repeatability deviation formula is as follows:

[0142] ,in,

[0143] —First test ;

[0144] —Second test ;

[0145] —The minimum value of the two test data α, β.

[0146] 36 subjects who met the requirements were randomly selected, and the results of two tests by the same tester are shown in Table 4.

[0147] Table 4.

[0148]

[0149] As shown in Table 4, in Test 1, the color difference between the foundation liquid 1 after rubbing and after application is ΔE=1.95<2, and the foundation liquid 1 has a friction resistance effect; in Test 2, the color difference between the foundation liquid 1 after rubbing and after application is ΔE=1.78<2, and the foundation liquid 1 has a friction resistance effect. The two test results are consistent, and the repeatability deviation is 9.55%, which meets the requirements.

[0150] Based on the present invention, technical users in the field should understand that one aspect described herein can be implemented independently of any other aspect, and two or more of these aspects can be combined in various ways. For example, any number and aspect described herein can be used to implement the device and / or practice the method. In addition, other structures and / or functionalities other than one or more of the aspects described herein can be used to implement this device and / or practice this method.

[0151] It should be noted that the above embodiments can be freely combined as needed. The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technical users in this technical field, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be regarded as the protection scope of the present invention.

[0152] All documents mentioned in the present invention are cited as references in this application, just as each document is cited as reference separately. In addition, it should be understood that after reading the above content of the present invention, users of this field of technology can make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the claims attached to this application.

Claims

1. A friction device for evaluating the friction resistance of cosmetics, characterized in that: The friction device comprises: A gripping unit, wherein the gripping unit has a first shell on the outside and a function button protruding from the first shell, a single-chip microcomputer is arranged inside the first shell, and the function button is connected to the single-chip microcomputer via a DuPont line; A power supply unit, the power supply unit has a second shell on the outside, the power supply unit has a motor, an energy storage battery and a charging connector, the charging connector is embedded in the second shell, the charging connector, the energy storage battery and the motor are electrically connected in sequence, and the motor has a power output shaft; A friction unit, wherein the friction unit comprises a friction body and a third shell semi-surrounding the friction body, wherein the third shell is connected to the second shell of the power supply unit via a fixing collar, wherein a rotating shaft is provided on a side of the friction body close to the power supply unit, wherein the rotating shaft is mechanically connected to the power output shaft of the motor; wherein the friction device can adjust the opening and closing of the friction body and the rotation speed of the friction body via a function button; wherein the friction body comprises: A base, the base is disc-shaped and has a central protrusion on one side, the other side of the base is fixedly connected to the rotating shaft, the central protrusion has an inner cavity, and a through hole communicating with the inner cavity is provided on the side of the central protrusion away from the rotating shaft; A telescopic rod, one end of which is slidably disposed in the inner cavity, and the other end of which extends out from the through hole; A compression spring wrapped around the outer circumference of the end of the telescopic rod extending from the through hole; A rigid load body, wherein one end of a telescopic rod of the rigid load body extending from the through hole is rotatably hinged to the top of the inner side of the rigid load body; a friction material layer, the friction material layer being detachably attached to the outer surface of the rigid load body; The friction device performs a friction operation on the test area of ​​the inner forearm skin of the qualified test subject where the cosmetic to be tested is applied.

2. A friction device for evaluating the friction resistance of cosmetics according to claim 1, characterized in that: One side of the base is provided with a central protrusion and a peripheral protrusion, and a bending portion is provided on the side of the peripheral protrusion away from the rotating shaft, and the bending direction of the bending portion is toward the central protrusion; The rigid load body is in an "Ω" shape. When the friction body is in a non-working state, the outer edge of the "Ω"-shaped rigid load body is interlocked with the bent portion of the peripheral protrusion, and the two ends of the compression spring are respectively abutted and fixed to the central protrusion and the inner side of the rigid load body, and the compression spring is in a compressed state.

3. A friction device for evaluating the friction resistance of cosmetics according to claim 2, characterized in that: The friction material layer is made of non-woven fabric.

4. A friction device for evaluating the friction resistance of cosmetics according to claim 3, characterized in that: The friction material layer has a gram weight of 35 to 100 g / m 2 The longitudinal and transverse bending lengths are ≤4.5cm, the longitudinal and transverse breaking strengths under dry conditions are ≥15N, the color fastness to dry friction is ≥level 4, and the surface roughness Ra is 10-30μm.

5. A method for evaluating the anti-friction effect of cosmetics using the friction device for evaluating the anti-friction effect of cosmetics according to any one of claims 1 to 4, characterized in that: The evaluation method comprises the following steps: Step S1: Setting and cleaning the application area before applying the cosmetic to be tested, selecting N test areas on the inner skin of the forearms of both hands of qualified subjects and marking them, N ≥ 1 and is an integer, and cleaning the N test areas; Step S2: Apply the cosmetics to be tested evenly to the N test areas by manual application, and control the application amount of the cosmetics to be tested to be 2.0±0.1mg / cm 2 ; Step S3: Data collection after the cosmetics to be tested are applied, and the brightness values ​​of the N test areas after the cosmetics to be tested are collected. , red and green values and blue-yellow value ; Step S4: rubbing the cosmetics to be tested, using the friction device to perform the same friction operation on the N test areas 15 to 30 minutes after the step S3 is completed; Step S5: Data collection after the cosmetics to be tested are rubbed, and the lightness values ​​of the N test areas after the cosmetics to be tested are collected. , red and green values and blue-yellow value ; Step S6: Calculate the skin color difference value, calculate the skin color difference value after the cosmetic to be tested is applied and after the cosmetic to be tested is rubbed ΔE , the skin color difference ΔE The calculation formula is as follows: ； Step S7: Skin color difference value ΔE Color difference with preset value ΔE 1 For comparison, if ΔE < ΔE 1 , the cosmetics to be tested have a friction-resistant effect; if ΔE > ΔE 1 , the cosmetics to be tested do not have a friction-resistant effect.

6. The method for evaluating the anti-friction effect of cosmetics according to claim 5, characterized in that: In step S1, when N≥2 and is an integer, the N test areas are spaced at least 1 cm apart from each other.

7. The method for evaluating the anti-friction effect of cosmetics according to claim 5, characterized in that: In step S2, when the manual application method is adopted, the application personnel need to wear latex gloves.

8. The method for evaluating the anti-friction effect of cosmetics according to claim 5, characterized in that: The friction operation refers to uniformly contacting and rubbing the friction device with the test area for a friction time of 20 to 40 seconds.

9. The method for evaluating the anti-friction effect of cosmetics according to claim 5, characterized in that: The preset color difference value Δ E 1 The value range is 0~2.

10. The method for evaluating the anti-friction effect of cosmetics according to claim 9, characterized in that: The preset color difference value ΔE 1 The value range is 1~2.

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