A quantitative measuring device for evaluating the stickiness of a cosmetic

Abstract

This utility model discloses a quantitative measuring device for evaluating the stickiness of cosmetics, belonging to the field of cosmetic testing technology. It includes a fixing component, a telescopic component, a measuring component, a pressure block, and test skin. The fixing component includes a base and a column; the base is placed on a working surface; the column is mounted on the base; the telescopic component is mounted on the base; the measuring component includes a connector and a force sensor; the force sensor is mounted on the column; the connector is connected to the force sensor; the test skin includes a first skin and a second skin, which are in contact with each other; the pressure block is used to enhance the contact between the first and second skins; the first skin is mounted on the telescopic component, and the second skin is connected to the connector. This utility model uses artificial skin to simulate the contact and separation process of skin, making operation simple and reducing the influence of subjective factors and external environment on the evaluation results; by measuring the force during the skin separation process through the force sensor, it achieves intuitive quantitative evaluation.

Description

Technical Field

[0001] This utility model belongs to the field of cosmetic testing technology, and specifically relates to a quantitative measuring device for evaluating the stickiness of cosmetics. Background Technology

[0002] The stickiness of cosmetics typically refers to the residual feeling and stickiness of a product after it has been applied to the skin for a period of time. It is an important factor that consumers pay close attention to when choosing cosmetics, as it directly affects the user experience. Febin Cyriac et al. (Tactile friction and rheological studies to objectify sensory properties of topical formulations, 2022) explored the possibility of using rheological and tribological methods to predict sensory properties, finding that friction data was correlated with subjective attributes such as stickiness felt after sensory evaluation. Kazushige Suzuki and Takehiko Watanabe (Relationship between seneory assessment and rheological properties of cosmetic creams, 1971) explored the relationship between the stickiness of face creams in sensory evaluation and rheological properties, finding that there was no clear relationship between the ranking of stickiness among products by evaluators and rheological parameters.

[0003] Currently, the stickiness of cosmetics is mainly assessed in the following ways: using visual experiments, such as applying the product to the skin and then sprinkling foam balls or feathers on it, observing the number of foam balls or feathers adhering to the skin to determine the stickiness level; assessing product stickiness through feedback from actual users, having consumers use the product and then collecting their subjective feelings about the product's stickiness; and assessing product stickiness through trained professional sensory evaluators, usually by having evaluators use the product under standardized conditions and then scoring the product's stickiness index.

[0004] However, Peter Busch and Thomas Gassenmeier (Cutaneous Biometrics, Chapter 6: Evaluation of Cosmetics by Sensory Assessment, 2000) argue that sensory assessment is a complex process involving objective natural science and subjective perception, related to the humanities. Individual anatomical differences, sensory organ receptivity, and psychological or cultural background all significantly influence the "ambiguity" of sensory experience. H. Iwata et al. (Formulas, Ingredients and Production of Cosmetics, Chapter 4: Sensory Properties of Cosmetics, 2013) suggest that the sensory attributes of consumer preferences for cosmetics may vary depending on the cosmetic category, application site, and season. All existing technologies related to these assessments suffer from the technical problem of relying on human subjectivity and lacking objective evaluation criteria; furthermore, professional sensory evaluators require systematic training and long-term practice to maintain professionalism—a labor-intensive, expensive, and time-consuming process. Utility Model Content

[0005] The purpose of this invention is to provide a quantitative measuring device for evaluating the stickiness of cosmetics, thereby solving the technical problems in the background art where the evaluation of cosmetic stickiness relies on human subjective consciousness and lacks objective evaluation basis, as well as the problem of expensive and time-consuming training of professional sensory evaluators.

[0006] To achieve the above objectives, the present invention provides the following technical solution.

[0007] A quantitative measuring device for evaluating the stickiness of cosmetics includes a fixing component, a telescopic component, a measuring component, a pressure block, and test skin;

[0008] The fixing component includes a base and a column; the base is placed on the working surface; the column is disposed on the base and extends away from the working surface.

[0009] The telescopic component is mounted on the base;

[0010] The measuring assembly includes a connector and a force sensor; the force sensor is mounted on a column; the connector is connected to the force sensor;

[0011] The test skin includes a first skin and a second skin, which are in contact with each other. At least part of the contact area is pre-coated with the cosmetic to be tested, and the part of the contact area coated with the cosmetic to be tested is the test area.

[0012] The pressure block is used to enhance the contact between the first skin and the second skin; during the skin contact process simulation, the pressure block is pressed onto the first skin or the second skin in a state of mutual contact, and at least a portion of the pressure block covers the test area;

[0013] During the skin separation process simulation, the first skin is placed on the telescopic component, and the second skin is connected to the connector.

[0014] Furthermore, both the first skin and the second skin are artificial skin.

[0015] Furthermore, the measuring component also includes a connecting part, which is clamped onto the second skin and connected to the connector head, thereby connecting the second skin to the connector head.

[0016] Furthermore, the measuring component also includes a housing; the force sensor is disposed within the housing; the housing is connected to the column, thereby enabling the force sensor to be mounted on the column.

[0017] Furthermore, a limiting part is provided on the column; the limiting part clamps the housing, thereby connecting the housing and the column.

[0018] Furthermore, the measuring component also includes a display screen, which is disposed on the housing and electrically connected to the force sensor for displaying the measured values ​​of the force sensor.

[0019] Furthermore, the telescopic assembly includes a mounting platform and a telescopic rod; the telescopic rod is disposed on the top surface of the base; the mounting platform is located on top of the telescopic rod, and the first skin is fixed on the mounting platform.

[0020] Furthermore, the measurement axis of the mechanical sensor is parallel to the straight line of the telescopic path of the telescopic component, and the center of the test area is located on the extension line of the measurement axis of the mechanical sensor.

[0021] Furthermore, the length of the second skin in the first direction is greater than the length of the first skin in the first direction, and the connecting portion is clamped at the two ends of the second skin that extend beyond the first skin.

[0022] Furthermore, the length of the first skin in the second direction is greater than the length of the second skin in the second direction.

[0023] This utility model has the following beneficial effects:

[0024] 1. This utility model provides a quantitative measuring device for evaluating the stickiness of cosmetics. It uses artificial skin to simulate the contact and separation process of skin, which is easy to operate, saves manpower and material resources, and reduces the influence of subjective factors and external environment on the evaluation results, thereby improving the accuracy and sensitivity of product stickiness evaluation.

[0025] 2. The present invention provides a quantitative measuring device for evaluating the stickiness of cosmetics. By setting up a pressure block, the repeatability and stability of the pressure application process are ensured. The device is simple to operate and is not affected by the operator's skill level.

[0026] 3. The present invention provides a quantitative measuring device for evaluating the stickiness of cosmetics, which uses artificial leather as the test material to avoid directly testing the product on human skin. The testing process is fast and has a short cycle. It also has consistent performance, reducing the influence of individual differences in natural leather or human skin. In addition, it has low production cost, is easy to clean, and can be reused, which has environmental and economic advantages.

[0027] 4. This utility model provides a quantitative measuring device for evaluating the stickiness of cosmetics. It measures the force during the skin separation process using a mechanical sensor, converting sensory experience into quantifiable values, and achieving intuitive quantitative evaluation. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the overall structure of the quantitative measuring device involved in this utility model;

[0029] Figure 2 This is a structural schematic diagram of the fixing component involved in this utility model.

[0030] In the diagram: 1-Fixing component, 11-Base, 12-Column, 13-Limiting part, 2-Telescopic component, 21-Telescopic rod, 22-Platform, 3-Measuring component, 31-Housing, 32-Connector, 33-Connecting part, 34-Display screen, 4-Pressure block, 5-Test skin, 51-First skin, 52-Second skin. Detailed Implementation

[0031] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0032] Unless otherwise defined or stated, all technical and scientific terms used herein have the same meaning as are familiar to a user skilled in the art. Furthermore, any methods and materials similar to or equivalent to those described herein may be applied to the methods of this invention.

[0033] It is 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 merely used to distinguish one element from another. Thus, a first element may be referred to as a second element without departing from the teachings of this disclosure.

[0034] Unless otherwise expressly specified and limited, the terms "connected," "connected," and "linked" in this utility model should be interpreted broadly. For example, they can refer to a fixed connection, a connection through an intermediary, or a connection within two elements or an interaction between two elements. Users of ordinary skill in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0035] For example, if an element (or component) is referred to as being on, coupled to, or connected to another element, then the element may be directly formed on, coupled to, or connected to the other element, or there may be one or more intermediate elements between them. Conversely, if the expressions "directly on," "directly coupled to," and "directly connected to" are used herein, then it indicates that there is no intermediate element. Other terms used to describe relationships between elements should be interpreted similarly, such as "between" and "directly between," "attached" and "directly attached," "adjacent" and "directly adjacent," etc.

[0036] Additionally, it should be noted that the terms "front," "rear," "left," "right," "up," and "down" used in the following description refer to directions in the accompanying drawings. The terms "inner" and "outer" refer to directions toward or away from the geometric center of a particular component, respectively. It is 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 accompanying drawings. These terms should also encompass other orientations of the device in addition to those described in the accompanying drawings.

[0037] like Figure 1As shown, the present invention provides a quantitative measuring device for evaluating the stickiness of cosmetics, including a fixing component 1, a telescopic component 2, a measuring component 3, a pressure block 4, and a test skin 5; the test piece includes a first skin 51 and a second skin 52. During the measurement process, the first skin 51 and the second skin 52 are in contact with each other, and the contact area is pre-coated with the cosmetic to be tested. The area in the contact area coated with the cosmetic to be tested is defined as the test area.

[0038] like Figure 2 As shown, the fixing component 1 includes a base 11, a column 12, and a limiting part 13. The base 11 is a plate and is placed on a working surface, which can be the ground, a table, or other load-bearing structure. For ease of description, the side of the base 11 closest to the working surface is defined as the bottom surface, and the side furthest from the working surface is defined as the top surface. The column 12 is mounted on the base 11 and extends in a direction away from the working surface. The limiting part 13 is mounted on the column 12 and is connected to the measuring component 3, providing an installation position for the measuring component 3.

[0039] In one embodiment, the column 12 is fixed to the base 11 by screws, and the extension direction of the column 12 is perpendicular to the plane of the base 11.

[0040] The telescopic assembly 2 includes a telescopic rod 21 and a mounting platform 22; the telescopic rod 21 is disposed on the top surface of the base 11; the mounting platform 22 is located on the top of the telescopic rod 21 away from the base 11 and is used to place the first skin 51; when evaluating the stickiness of cosmetics, the first skin 51 can be made of artificial leather, and clips are spaced apart on the top surface of the mounting platform 22, and the first skin 51 is fixed on the mounting platform 22 by the clips.

[0041] The telescopic rod 21 includes a movable part and a fixed part; the fixed part is fixedly installed on the top surface of the base 11; the movable part is located at the top of the fixed part away from the base 11, and the movable part can move in the direction of approaching or moving away from the base 11 to realize the length adjustment of the telescopic rod 21.

[0042] In one embodiment, the movable part is slidably connected to the fixed part; a lead screw mechanism is provided inside the telescopic rod 21, the lead screw mechanism includes a drive motor, a lead screw, a nut seat and a guide rail. The lead screw mechanism is existing technology, so its working principle and the connection relationship of each component will not be described in detail here; the movable part is connected to the nut seat of the lead screw mechanism, and by controlling the lead screw mechanism, the movable part moves in the direction of approaching or moving away from the base 11.

[0043] The height adjustment of the telescopic rod 21 can also be achieved by other telescopic methods in the existing technology, so as to achieve uniform movement of the telescopic component 2.

[0044] In one embodiment, the telescopic rod 21 moves at a speed of 5 mm / s during its extension and retraction.

[0045] The measuring component 3 includes a housing 31, a connector 32, a connecting part 33, a force sensor, and a display screen 34. The housing 31 is located above the mounting platform 22 away from the base 11 and is connected to the limiting part 13, and is mounted on the column 12 through the limiting part 13. The connector 32 is located at the bottom end of the housing 31 near the mounting platform 22. The connecting part 33 is hung on the connector 32 and is detachably connected to the second skin 52. When evaluating the stickiness of cosmetics, the second skin 52 can be made of artificial leather. The force sensor is located inside the housing 31 and is connected to the connector 32 to measure the force value of the connector 32. The center line of the connector 32 is collinear with the measuring axis of the force sensor. The display screen 34 is located on the housing 31 and is electrically connected to the force sensor to display the measured value of the force sensor.

[0046] In one embodiment, the limiting part 13 is a clamp that holds the housing 31 to fix the housing 31.

[0047] In one embodiment, the connector 32 is a hook, and the second skin 52 is hung on the hook via the connecting part 33. The connecting part 33 is clamped onto the second skin 52 and has a through hole through which it is hung on the hook. The connection between the connector 32 and the connecting part 33 is stable, ensuring effective force transmission.

[0048] In one embodiment, the range of the mechanical sensor is 0.2N-2N.

[0049] The pressure block 4 is placed on the base 11 and can also be removed from the base 11. The pressure block 4 provides stable pressure to the first skin 51 and the second skin 52, so that the first skin 51 and the second skin 52 are in uniform contact.

[0050] In one embodiment, the pressure provided by the pressure block 4 is above 2000 N / m2.

[0051] In one embodiment, the first skin 51 and the second skin 52 are made of the same artificial leather, which is a lychee-textured PU material and has human skin-like properties such as breathability, moisture permeability, texture similar to human skin, and softness.

[0052] The measuring axis of the mechanical sensor is parallel to the straight line of the telescopic rod 21's telescopic path, and the center of the test area is located on the extension line of the measuring axis of the mechanical sensor to eliminate eccentricity error.

[0053] When using the quantitative measuring device of this application to evaluate the viscosity of cosmetics, the specific steps include:

[0054] S1. Application area setting and cleaning: Mark the test area at the center of the artificial skin of the second skin 52, and clean the test area with medical alcohol;

[0055] S2. Application of the cosmetic to be tested: The cosmetic to be tested is applied evenly to the test area by manual application. The person applying the cosmetic must wear a latex finger cot. The application time is 1 minute. The amount of the cosmetic to be tested applied is controlled at 4 μL / cm2. The absorption time of the cosmetic to be tested is 5 minutes.

[0056] S3, Skin contact process simulation: The artificial skin of the second skin 52 is placed on the first skin 51 to make the test area and the first skin 51 in close contact. Then, the pressure block 4 is pressed on the artificial skin of the second skin 52 corresponding to the test area. After applying constant pressure to the test area for 1 minute, the pressure block 4 is removed. The skin contact process simulation is to simulate the skin contact process by using the second skin 52 and the first skin 51 to contact.

[0057] S4. Without separating the second skin 52 from the first skin 51, the two are transferred as a whole to the mounting platform 22. The first skin 51 contacts the mounting platform 22, and the second skin 52 is hung on the connector 32 through the connecting part 33. At this time, the connector 32 is in a state of no force.

[0058] S5. Skin separation process simulation: Set the mechanical sensor to peak mode to capture and maintain the maximum value during the measurement process. Control the telescopic rod 21 to move at a constant speed towards the base 11 to separate the second skin 52 from the first skin 51. Record the peak value F1 of the mechanical sensor during the skin separation process. Remove the pressure block 4. All operations before the start of the skin separation process simulation should be completed within 2 minutes. The skin separation process simulation is to simulate the skin separation process by separating the second skin 52 from the first skin 51.

[0059] S6. Calculation of the stickiness of the cosmetic to be tested: Set the mechanical sensor to the instant value mode to output the current measurement value in real time, and record the mechanical sensor reading F2 when the second skin 52 and the connecting part 33 are both connected to the connector 32. The stickiness is F1-F2.

[0060] In one embodiment, the length of the second skin 52 in the first direction is greater than the length of the first skin 51 in the first direction. The connecting portion 33 clamps the two ends of the second skin 52 that extend beyond the first skin 51. A counterweight is placed in the middle of the second skin 52 so that the force during the skin separation process is within the range of the force sensor. At this time, in step S6, the reading of the force sensor when the second skin 52, the connecting portion 33, and the counterweight are all connected to the connector 32 is recorded as F2, and the viscosity is F1-F2.

[0061] In one embodiment, the length of the first skin 51 in the second direction is greater than the length of the second skin 52 in the second direction, so that in step S4, when transferring the second skin 52 and the first skin 51 as a whole, the operator can hold the end of the first skin 51 that extends beyond the second skin 52.

[0062] To further illustrate the present application, specific embodiments will be described below.

[0063] Example 1

[0064] (1) Selection of test samples

[0065] From over 200 products that have been quantitatively described and analyzed by professional sensory evaluators, two products with high and two with low scores in stickiness (referring to the residue of the test sample on the skin surface after use, and the stickiness of the skin) were selected, along with three products with significant market feedback regarding stickiness, to evaluate the stickiness discrimination ability of the quantitative measurement device of this application.

[0066] (2) Testing process

[0067] S1. Application area setting and cleaning: Mark the test area in the center of the artificial skin (7cm*21cm) of the second skin 52. The test area is 5cm*5cm in size. Clean the test area with medical alcohol.

[0068] S2. Application of the cosmetic to be tested: The cosmetic to be tested is applied evenly to the test area by wearing a finger cot and manually. The amount of the cosmetic to be tested is controlled to be 100μL, the application time is 1min, and the absorption time of the cosmetic to be tested is 5min.

[0069] S3. Contact Process Simulation: Cover the artificial skin of the first skin 51 (10cm*10cm) with the artificial skin of the second skin 52, ensuring close contact between the test area and the first skin 51. Then, apply pressure block 4 (weighing 4700g, measuring 10cm*10cm*6cm, generating a pressure of approximately 4600N / m). 2 The corresponding test area is pressed onto the artificial skin of the second skin 52, so that the second skin 52 and the first skin 51 are in close contact in the test area. After applying constant pressure for 1 minute, the pressure block 4 is removed.

[0070] S4. The two ends of the second skin 52 are clamped together by the connecting part 33, so that the two sides of the second skin 52 are turned up. A counterweight (50mm*50mm in size) is placed on the top surface of the middle part of the second skin 52 to achieve the minimum range of the force sensor. Without separating from the first skin 51, the whole is transferred to the mounting platform. The first skin 51 is fixed to the mounting platform by the clamp. The connecting part 33 clamping the two ends of the second skin 52 is hung on the connector 32. At this time, the connector 32 is in a state of no force.

[0071] S5: Skin separation process simulation: Set the mechanical measurement component to peak mode, control the telescopic rod 21 to move towards the base 11, so that the second skin 52 separates from the first skin 51, and record the peak value F1 of the mechanical sensor during the skin separation process;

[0072] S6. Calculation of the stickiness of the cosmetic to be tested: Set the mechanical sensor to the instantaneous value mode, and record the mechanical sensor reading F2 when the second skin 52, the connecting part 33 and the counterweight are all connected to the connector 32. The stickiness of the cosmetic is F1-F2.

[0073] (3) Statistical Results

[0074] Table 1 shows the stickiness scores given by professional sensory evaluators for the seven products and the stickiness measured by the integrated device.

[0075] Table 1

[0076]

[0077] The lower the sensory evaluation score, the higher the stickiness; the higher the stickiness measurement value, the higher the stickiness. As shown in Table 1, the quantitative measurement device of this application can effectively evaluate products with different levels of stickiness, and the measured values ​​are inversely proportional to the scores of professional sensory evaluators. The linear fitting determination coefficient R for the seven products is [missing information]. 2 It is 0.59.

[0078] Example 2

[0079] The operation process is the same as in Example 1, involving multiple measurements of the viscosity of the same sample using the method of this 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 example, an error of no more than 10% is considered acceptable.

[0080] The formula for repeatability bias is: in,

[0081] α—The viscosity of the first test;

[0082] β—viscosity of the second test;

[0083] min(α, β) — the minimum value of α and β from two test data sets.

[0084] Three products with different textures—cream, lotion, and emulsion—were randomly selected. The results of two tests conducted by the same testing personnel are shown in Table 2.

[0085] Table 2

[0086]

[0087] As shown in Table 2, the repeatability deviations of the two tests conducted by the same inspector for the three textures of cream, water, and lotion were 9.23%, 9.09%, and 7.57%, respectively, all of which met the requirements.

[0088] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A quantitative measuring device for evaluating the stickiness of cosmetics, characterized in that: Includes fixing components, telescopic components, measuring components, pressure blocks, and test skin; The fixing component includes a base and a column; the base is placed on the working surface; the column is disposed on the base and extends away from the working surface. The telescopic component is mounted on the base; The measuring assembly includes a connector and a force sensor; the force sensor is mounted on a column; the connector is connected to the force sensor; The test skin includes a first skin and a second skin, which are in contact with each other. At least part of the contact area is pre-coated with the cosmetic to be tested, and the part of the contact area coated with the cosmetic to be tested is the test area. The pressure block is used to enhance the contact between the first skin and the second skin; during the skin contact process simulation, the pressure block is pressed onto the first skin or the second skin in a state of mutual contact, and at least a portion of the pressure block covers the test area; During the skin separation process simulation, the first skin is placed on the telescopic component, and the second skin is connected to the connector.

2. The quantitative measuring device for evaluating the stickiness of cosmetics according to claim 1, characterized in that: Both the first skin and the second skin are artificial skin.

3. The quantitative measuring device for evaluating the stickiness of cosmetics according to claim 1, characterized in that: The measuring component also includes a connecting part, which is clamped onto the second skin and connected to the connector head, thereby connecting the second skin to the connector head.

4. A quantitative measuring device for evaluating the stickiness of cosmetics according to claim 1, characterized in that: The measuring assembly also includes a housing; the mechanical sensor is disposed inside the housing; the housing is connected to the column to enable the mechanical sensor to be installed on the column.

5. A quantitative measuring device for evaluating the stickiness of cosmetics according to claim 4, characterized in that: A limiting part is provided on the column; the limiting part clamps the housing, thereby connecting the housing and the column.

6. A quantitative measuring device for evaluating the stickiness of cosmetics according to claim 4, characterized in that: The measuring component also includes a display screen, which is disposed on the housing and electrically connected to the force sensor for displaying the measured values ​​of the force sensor.

7. A quantitative measuring device for evaluating the stickiness of cosmetics according to claim 1, characterized in that: The telescopic assembly includes a mounting platform and a telescopic rod; the telescopic rod is disposed on the top surface of the base; the mounting platform is located on top of the telescopic rod, and the first skin is fixed on the mounting platform.

8. A quantitative measuring device for evaluating the stickiness of cosmetics according to claim 1, characterized in that: The measurement axis of the mechanical sensor is parallel to the straight line of the telescopic component's telescopic path, and the center of the test area is located on the extension line of the measurement axis of the mechanical sensor.

9. A quantitative measuring device for evaluating the stickiness of cosmetics according to claim 3, characterized in that: The length of the second skin in the first direction is greater than the length of the first skin in the first direction, and the connecting portion is clamped at the two ends of the second skin that extend beyond the first skin.

10. A quantitative measuring device for evaluating the stickiness of cosmetics according to claim 1, characterized in that: The length of the first skin in the second direction is greater than the length of the second skin in the second direction.

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