JP4322177B2 - Evaluation method for solid powder cosmetics - Google Patents

Description

  The present invention relates to a method for evaluating a composition in which a powder is molded, and a pressure contactor and apparatus for use in the method.

  Solid powder cosmetics such as foundations are provided by preparing powders and liquids as components thereof into a molding composition with a specific composition and storing it in a storage case. The composition of the components of such a solid powder cosmetic is determined based on various evaluation items such as a feeling of use due to sensory and the difficulty of cracking after being stored in a storage case. At present, the composition of the enormous combination of ingredients to be blended is repeated in the form of trial production and sensory evaluation.

  On the other hand, for example, as in the techniques described in Patent Document 1 and Patent Document 2 below, paying attention to specific physical properties such as Asker hardness, the measured values of the physical properties and the feeling of use of cosmetics of a specific composition Although a method for evaluating the cosmetics in association with each other has been proposed, Asker hardness does not seem to be an objective index for evaluating the physical properties of the powder and its molding composition. Therefore, there has been a demand for a technique that can easily and intuitively evaluate the feeling of use of cosmetics regardless of the composition.

JP 2000-80235 A JP 2001-354519 A

  The present invention has been made in view of the above-described problems, and is a powder molding composition that can objectively evaluate the mechanical feeling of use (hereinafter referred to as the feeling of use) of the powder molding composition. It is an object of the present invention to provide an evaluation method of the above, a pressure contactor and an apparatus for use in the evaluation method.

  In the present invention, after pressing the protrusion of the press contact having the protrusion into the molding composition of the powder in the normal direction, the press contact with respect to the molding composition so that the protrusion rotates concentrically. Provided is a method for evaluating a molding composition of a powder, which evaluates a feeling of use of the molding composition based on a torque value, a normal force, or a position of the press contact in the normal direction. This achieves the object.

  Further, the present invention is a pressure contactor for use in the method for evaluating a molding composition of a powder according to the present invention, comprising a base and a protrusion protruding from the base, the protrusion being the It is an object of the present invention to provide a composition evaluating press contact element which is disposed concentrically with respect to a rotation axis of a base portion.

  Further, the present invention is an apparatus for use in a method for evaluating a molding composition of a powder, and includes an apparatus main body and a press contact attached to the apparatus main body, and the apparatus main body includes the press contact A pressing force pushing means for pushing the pressing contact into the molding composition, a pressing contact rotating means for rotating the pressing contact in one direction with the pressing contact being pushed into the molding composition, and a normal force of the pressing contact. A normal force detecting means for detecting, a torque detecting means for detecting the torque value, or a position detecting means for detecting a position of the pressure contact in the normal direction. The pressure contact is a base and a method based on the base. The present invention provides an evaluation apparatus for a powder molding composition having a protrusion protruding in a linear direction and the protrusion being arranged concentrically with respect to the rotation axis of the base.

  According to the method for evaluating a molding composition of a powder of the present invention, and a pressure contactor and an apparatus used for the method, the feeling of use of the molding composition of the powder can be objectively evaluated.

  Hereinafter, the present invention will be described based on preferred embodiments with reference to the drawings.

  FIG. 1 schematically shows an embodiment of an evaluation apparatus for use in the method for evaluating a powder molding composition of the present invention. In FIG. 1, reference numeral 1 denotes an evaluation apparatus, 10 denotes a powder molding composition (hereinafter also simply referred to as a molding composition), and 11 denotes a molding composition storage container.

  The evaluation device 1 includes a device main body 2 and a press contact 3 attached to the device main body 2.

  The apparatus main body 2 includes a pressure contact pushing means 21 that operates to push the pressure contact 3 into the molding composition 10, a pressure contact rotating means 22 that rotates the pressure contact 3 in one direction with respect to the molding composition 10, and A normal force detecting means 23 for detecting a normal force applied to the press contact 3, a torque detecting means 24 for detecting a torque value applied to the press contact 3, and a position for detecting the position of the press contact 3 in the normal direction. Detection means (not shown). The apparatus main body 2 includes arithmetic processing means 25 that controls these means and outputs the output detected by each detecting means to the output means 26. The apparatus main body 2 includes a mounting table 27 for mounting and fixing the molding composition 10 to be measured in a state where the molding composition 10 is stored in the storage container 11.

  The press-contact pushing means 21 includes a carriage 210 and a feed mechanism (not shown) that moves the carriage 210 up and down along the guide rail. The presser rotating means 22 is composed of a motor and is fixed to the carriage 210. The normal force detecting means 23 is constituted by a load cell. The torque detecting means 24 is composed of a torque sensor attached to a motor constituting the presser contact rotating means 22. The position detection means is composed of a decoder (not shown) attached to the motor of the feed mechanism of the carriage 210. For the apparatus main body 2, for example, a commercially available rotary rheometer is used.

  The press contactor 3 has a substrate part (base part) 30 arranged substantially horizontally and a pair of protrusions 31, 31 that protrude downward from the lower surface part of the substrate part 30 and come into contact with the molding composition. The protrusions 31 are arranged concentrically with respect to the rotation axis of the substrate unit 30 (in this embodiment, a normal passing through the center of the plate surface of the substrate unit). That is, the rotation axis (rotation center) of the substrate part 30 and the protrusions 31 and 31 is the same. The press contact 3 is attached so that the center of the plate surface of the substrate portion 30 and the center axis of the output shaft 220 of the press contact rotating means 22 coincide with each other so that the substrate portion 30 is horizontal at the tip of the output shaft 220. Thereby, the protrusion 31 of the press contact 3 rotates to one side at a position concentric with the center of the output shaft 220 as the motor of the press contact rotating means 22 is driven.

  The position (the distance between the center line of the output shaft 220 and the center line of the protrusion 31) L in the press contactor 3 is determined by taking into consideration the prevention of cracking of the molding composition and the detectable lower limit of torque. The diameter is preferably 3 to 20 times, particularly 5 to 15 times the part diameter.

  The shape of the tip of the protrusion 31 is hemispherical. In this case, the radius of the tip of the protrusion 31 is preferably 0.5 to 4 mm, particularly preferably 1 to 3 mm in consideration of good measurement reproducibility.

  In consideration of minimizing the influence on the measurement result due to abrasion of the protrusions, the surface of the tip part of the protrusions 31 is preferably finished to have a gloss with a material with little abrasion.

  It is preferable that at least a portion of the press contact 3 in contact with the molding composition is a material with little wear.

  As a material of at least a portion in contact with the molding composition in the press contactor 3, a material having excellent wear resistance such as zirconia, tungsten carbide, boron nitride and the like is preferable.

  Next, the evaluation method of the molding composition of the powder of this invention is demonstrated based on 1st Embodiment using the evaluation apparatus 1 of the said embodiment.

First, the molding composition is stored in the storage container 11 and mounted on the mounting table 27.
It is preferable that the molding composition 10 has a substantially uniform thickness and is stored in the storage container 11 so that the surface is substantially horizontal. The thickness of the molding composition 10 in the accommodated state is preferably 2 to 15 mm, particularly preferably 3 to 10 mm in consideration of cracking fracture of the molding composition being measured. Further, the surface area is preferably 100 to 2000 times, particularly 200 to 1000 times the total area of the base part of the press contact in consideration of measurement reproducibility.

  Examples of the composition to be evaluated in the present invention include solid powder cosmetics such as foundation, teak, and fun.

  The molding composition can be evaluated by appropriately setting the atmosphere such as temperature and humidity according to the molding composition to be evaluated, but it is preferably performed in a temperature and humidity environment when the product is used. .

  Next, the carriage 210 of the pressure contact pushing means 21 is driven to lower the pressure contact 3 and push the projection 31 of the pressure contact 3 into the molding composition 10 from the normal direction. The indentation depth of the protrusion 31 is 0.5 to 30% of the thickness of the molding composition, especially 1% to 20% in consideration of obtaining results that can be used for prevention of cracking of the molding composition and evaluation of the feeling of use. Is preferred.

  The indentation speed is set to 0.01 to 0.2 mm / s, particularly 0.03 to 0.1 mm / s in consideration of prevention of cracking of the molding composition and efficient measurement time. preferable.

  Then, from the plot (see FIG. 2) showing the relationship between the normal force received by the pressure contactor during the indentation process and the position of the pressure contact in the normal direction, the normal at a certain indentation depth (position in the normal direction) The force is read to determine the ease with which the pressure contactor is pushed into the molding composition. The smaller the normal force is, the easier it is to push the molding composition, and the easier the pushing is, the less resistance is felt when scraping off the molding composition. Specifically, for example, by obtaining a normal force value at a certain indentation depth for each of the molding composition to be measured and the reference molding composition, and comparing the magnitudes thereof, the friction of the molding composition is determined. It is possible to evaluate the quality of lightness.

  Next, the evaluation method of the molding composition of this invention is demonstrated based on 2nd Embodiment using the evaluation apparatus 1 of the said embodiment. Since the measuring method of the molding composition of this embodiment is the same as that of the measuring method of the said 1st Embodiment, description is abbreviate | omitted about the part which is common in the said 1st Embodiment. Therefore, the description in the first embodiment is appropriately applied to a portion not particularly described.

  After the protrusion 31 is pushed into the molding composition in the same manner as in the first embodiment, the pressure contactor pushing means 21 applies a normal force to the molding composition, and the pressure contactor rotating means 22 forms the pressure contactor 3. Rotate in one direction relative to the composition. In the present embodiment, the motor of the press contact rotating means 22 is driven to rotate the output shaft 220 around the central axis (around the normal direction), and the protrusion 31 of the upper press contact 3 is rotated at the concentric position.

  In consideration of measurement reproducibility, the normal force applied to the molding composition should be such that the cutting depth of the measurement molding composition accompanying one rotation of the press contact does not exceed 0.5 mm. For example, when the diameter of the base of the press contact is 2 mm, a normal force of about 1 to 2N is applied. In consideration of preventing cracking of the molding composition and obtaining a measurement result in as short a measurement time as possible, the rotational speed of the press contactor 3 is preferably 1 to 20 rpm, particularly 3 to 10 rpm. In consideration of obtaining measurement results in as short a measurement time as possible, the number of rotations of the press contact 3 is preferably 3 to 20 times, particularly 4 to 10 times.

  Next, the position in the normal direction of the press contact 3 when the press contact 3 is rotated in one direction as described above is detected. And from the plot (refer FIG. 3) with respect to the time axis of a normal direction position obtained based on the position of the detected normal direction, the shaving depth of the molding composition used for the measurement is calculated | required. Here, the shaving depth refers to the amount of shaving of the molding composition due to the rotation of the projection 31, and the normal of the tip of the projection 31 from when the pressure contactor first contacts the surface of the molding composition being measured. It can be obtained from the amount of change in the direction position.

  And it is evaluated that the greater the shaving depth determined as described above, the less resistance is felt when the molding composition is scraped off. Specifically, for example, by determining the shaving depth for the molding composition to be measured and the molding composition used as a reference, and comparing the size, the quality of the scraping lightness of the molding composition is evaluated. can do.

  Next, the molding composition evaluation method of the present invention will be described based on a third embodiment using the evaluation apparatus 1 of the above embodiment.

  The evaluation method of the molding composition of the present embodiment is the same as the evaluation method of the second embodiment, except that the torque value of the press contact 3 when the press contact 3 is rotated in one direction is detected. Since it is the same as that of 2nd Embodiment, description is abbreviate | omitted about the part which is common in the said 2nd Embodiment. Therefore, the description in the second embodiment is appropriately applied to a portion not particularly described.

  In the present embodiment, the fluctuation range W of the torque value is obtained from a plot of the torque value with respect to the time axis obtained based on the detected torque value as shown in FIG. As the fluctuation range W, a standard deviation with respect to an average value of measured values of torque values (for example, all measured values) can be used. When determining the fluctuation width W, it is preferable to eliminate the influence of the hole formed in the molding composition by the protrusion 31 on the measurement result. Specifically, for example, it is preferable not to use the measured value of the torque value at the first and second rotations of the press contact, but to adopt the measured value after the third rotation. When the physical properties of different types of molding compositions are compared with each other, it is preferable to unify how many rotations of the press contactor are used.

  Then, it is evaluated that the smaller the fluctuation range of the torque value obtained as described above, the less the resistance when rubbing the molding composition, and the smoother application to the skin is. Specifically, for example, by obtaining the fluctuation range of the torque value for the molding composition to be measured and the reference molding composition, respectively, and comparing the magnitudes thereof, the lightness of scraping of the molding composition and the skin The quality of the smoothness of application can be evaluated.

  As described above, according to the molding composition evaluation apparatus and the coagulation composition evaluation apparatus method of each embodiment using the molding composition, the feeling of use can be simplified regardless of the composition of the molding composition. Can be objectively evaluated

  The present invention is not limited to the above-described embodiment, and can be changed as appropriate without departing from the spirit of the present invention.

  The present invention is preferably evaluated by an apparatus having two protrusions as in the above embodiment and the apparatus. However, the apparatus is configured by arranging one or more protrusions on the press contactor, It can also be evaluated with a device.

Hereinafter, the present invention will be described more specifically with reference to examples.
About six kinds of typical commercial foundations (solid powder cosmetics: molding composition), the torque value, the normal force, and the position in the normal direction of the press contact are obtained as in Examples 1 to 3 below, and the sponge is removed. The foundation was scraped off and the resistance at that time and the smoothness when applied to the skin were estimated. As a reference example, a sensory test using a sponge as described below was used to evaluate the resistance when rubbing the foundation and the smoothness of application to the skin.

[Example 1]
The pressure contactor was pushed into the foundation under the following conditions, the normal force and the push-in depth between them were measured, and the normal force when the pressure contactor was pushed in by 0.3 mm for each commercial foundation was determined. FIG. 5 shows the relationship between the obtained normal force and the resistance feeling at the time of scraping obtained from the sensory test.

<Evaluation equipment>
Device body: Paar Pysica, rotary rheometer, model MCR300
Center position of the protrusion of the press contact: 10 mm from the center of the output shaft Radius of the tip of the press contact: 2 mm
Pressure contact material: Zirconia

<Measurement conditions>
Press-in speed of the press contact: 0.05 mm / second Measurement atmosphere: 23 ° C., 50 RH%

[Example 2]
The press contactor was pushed into a commercially available foundation at a speed of 0.05 mm / second for 15 seconds, and then the press contactor was rotated under the following conditions, and the shaving depth after the measurement was measured. And the relationship between the obtained depth of shaving and the resistance at the time of scraping determined from the sensitivity evaluation was determined. The result is shown in FIG.

<Evaluation equipment>
Device main body: Same as Example 1.
Eccentric position of the protrusion of the press contact: Same as Example 1.
Tip radius of the protrusion of the press contact: Same as Example 1.
Material of the press contact: Same as Example 1.

<Measurement conditions after pressing the press-contact>
Normal force: 1N
Rotation speed: 6rpm
Measurement atmosphere: Same as Example 1.

Example 3
The measurement was performed in the same manner as in Example 2 except that the torque value at the time of rotating the press contact was measured instead of the shaving depth. Then, from the relationship between the obtained torque value and time, the standard deviation of each torque value from the third rotation to the sixth rotation is obtained and used as the variation (variation width) of the torque value. FIG. 7 shows the relationship between the obtained torque value variation and the resistance at the time of rubbing determined from sensory evaluation, and FIG. 8 shows the relationship between the smoothness of application to the skin.

[Reference example]
About the commercially available foundation similar to that used in Examples 1 to 3, the resistance at the time of rubbing the foundation and the smoothness of application to the skin were evaluated by the following sensory test.
Three expert evaluators discussed the resistance when rubbing each foundation using the sponge for foundation and the smoothness when applying on the skin, and scored between 0 and 100, with a perfect score of 100 It was evaluated with.

[Comparison between evaluation by example and evaluation by reference example]
As is clear from the results of Examples 1 to 3 shown in FIGS. 5 to 8, according to the apparatus and method of the present invention, the normal force value when pressing the press contact into the foundation, the press contact was pressed into the foundation. The variation of foundation shaving depth and torque value when the pressure contactor is rotated in the state is the resistance obtained when rubbing the foundation with a sponge obtained by the reference example and smoothness when applied on the skin It was confirmed that there was a good correlation. According to the method of the present invention, it has become possible to perform evaluation of touch items, which conventionally had to rely on human sensory evaluation, regardless of a person (expert), and to obtain a quantitative result. .

  The method and apparatus for evaluating the molding composition of the powder of the present invention is not particularly limited in the use of the molding composition to be evaluated, but various types such as solid powder cosmetics such as foundation, teak, and funny in the above examples. It is particularly suitable for evaluating the mechanical feel of the molding composition.

It is a figure which shows typically one Embodiment of the evaluation apparatus of the molding composition of this invention. It is a figure which shows the example of a measurement of the relationship between normal force and indentation depth which are obtained by 1st Embodiment of the evaluation method of the molding composition of this invention. It is a figure which shows the example of a measurement of the relationship between the shaving depth and time axis which are obtained by 2nd Embodiment of the evaluation method of the molding composition of this invention. It is a figure which shows the example of a measurement of the relationship between the torque value obtained by 3rd Embodiment of the evaluation method of the molding composition of this invention, and a time axis. It is a figure which shows the relationship between the normal force at the time of pushing a pressure contactor 0.3mm in the commercial foundation obtained by Example 1, and the result of having sensory-evaluated the resistance at the time of scraping a foundation with a sponge. It is a figure which shows the relationship between the result of having sensory-evaluated the feeling of resistance at the time of scraping off a foundation with a sponge and the abrasion depth when rotating the press contactor pressed by the commercial foundation obtained by Example 2. FIG. It is a figure which shows the relationship between the result of having sensory-evaluated the resistance at the time of rubbing a foundation with a sponge, and the variation in the torque value when rotating the press-contacting member pressed by the commercial foundation obtained by Example 3. FIG. The relationship between the variation of the torque value obtained by rotating the pressure contact member pressed against the commercial foundation obtained in Example 3 and the result of the sensory evaluation of the smoothness during application on the skin with a sponge is shown. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Composition evaluation apparatus 2 Apparatus main body 21 Indenter pushing means 22 Indenter rotating means 23 Normal force detecting means 24 Torque detecting means 25 Arithmetic processing means 26 Output means 3 Indenter 31 Protrusion 10 Solid powder cosmetic (molding composition) object)

Claims (7)

After the protrusion of the press contact having the protrusion is pushed into the solid powder cosmetic in the normal direction, the press contact is unidirectional with respect to the solid powder cosmetic so that the protrusion rotates concentrically. The evaluation method of the solid powder cosmetics which evaluates the usability | use_condition of the said solid powder cosmetics based on the torque value when rotated, normal force, or the position of the said normal direction of the said press contactor. The pressure contactor is pushed into the solid powder cosmetic in the normal direction, and the ease of pushing is determined from the magnitude of the normal force at a certain pushing amount, and the solid powder cosmetic is rubbed as it is easy to push. The method for evaluating a solid powder cosmetic according to claim 1, wherein it is evaluated that there is little resistance when taking. The pressers seek scraping depth from the change in position of the tip of the solid powder cosmetic of the larger the deeper scraping those solid when the pressers is rotated in one direction relative to the solid powder cosmetic The method for evaluating a solid powder cosmetic according to claim 1, wherein it is evaluated that there is little resistance when the powder cosmetic is scraped off. The pressers obtains the fluctuation band of the torque value when rotating in one direction relative to the solid powder cosmetic, less feeling of resistance when the fluctuation range scrape narrow enough the solid powder cosmetic, The method for evaluating a solid powder cosmetic according to claim 1, wherein it is evaluated that it can be smoothly applied to the skin. 2. The solid powder cosmetic according to claim 1 , wherein the press contactor has a base and a protrusion protruding from the base, and the protrusion is disposed concentrically with respect to a rotation axis of the base . Evaluation method . The method for evaluating a solid powder cosmetic according to claim 5, comprising a plurality of the protrusions. A equipment for Ru employed in the practice of the evaluation method of claim 1 wherein the solid powder cosmetic,
An apparatus main body, and a press contact attached to the apparatus main body,
The apparatus main body, pressers rotating means for rotating said pressers and pressers pushing means for pressed into the pressed powder cosmetic, the piezoelectric Secco in one direction in a state that pushed the pressers on the solid powder cosmetic And normal force detection means for detecting the normal force of the press contact, torque detection means for detecting the torque value, or position detection means for detecting the position of the press contact in the normal direction,
The press contact has a base and a protrusion protruding in a normal direction from the base, and the protrusion is arranged concentrically with respect to the rotation axis of the base .
The evaluation apparatus of the solid powder cosmetics in which the front- end | tip part of the said projection part has a hemispherical shape .

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