Manufacturing method for solid powder cosmetics

Abstract

To provide methods for producing a solid powder cosmetic capable of reliably forming a dent of a predetermined shape on the periphery of the solid powder cosmetic.SOLUTION: Using a temporary compacting press head 3 having a flat pressing surface 3a facing a container 2, a powder cosmetic S is press-processed into the temporary compacting. After performing the temporary compacting, using a final compacting press head 5 in which a peripheral edge portion 5d of the pressing surface 5a facing the container 2 protrudes toward the container 2 side from a portion 5c surrounded by the peripheral edge portion 5d, the powdered cosmetic S is press-processed into the final compacting.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a method for producing a solid powder cosmetic, and more particularly to a method for producing a solid powder cosmetic by pressing a powder cosmetic filled in a container into a mold. [Background technology]

[0002] Conventionally, when producing solid cosmetics, it is common to press powder or slurry cosmetics to form a mold, as shown in, for example, Patent Documents 1 to 3. In particular, Patent Documents 1 to 3 propose that the pressing process involves a first pressing, i.e., temporary pressing, and a second pressing, i.e., final pressing, performed after the temporary pressing. Hereinafter, the step of performing temporary pressing will be referred to as the temporary pressing step, and the step of performing final pressing will be referred to as the final pressing step.

[0003] More specifically, in the methods disclosed in Patent Documents 1 and 2, the preliminary molding step is performed using a press head (hereinafter referred to as a concave head) whose peripheral edge on the surface facing the cosmetic to be molded protrudes toward the container beyond the area surrounded by the peripheral edge, and the final molding step is performed using a press head (hereinafter referred to as a flat head) whose surface facing the cosmetic to be molded is essentially flat. Also, in the method disclosed in Patent Document 3, both the preliminary molding step and the final molding step are performed using a concave head.

[0004] The method disclosed in Patent Document 1 employs the above-described configuration, which makes it possible to reduce burrs remaining on the periphery of the cosmetic. Furthermore, the method disclosed in Patent Document 2 employs the above-described configuration, which makes it possible to compress and mold a slurry cosmetic to be pressed into a mold into a convex shape. Furthermore, the method disclosed in Patent Document 2 employs the above-described configuration, which makes it possible to produce a convex-shaped solid powder cosmetic with a uniform hardness. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Patent No. 6284801 [Patent Document 2] Japanese Patent Application Laid-Open No. 2010-106002 [Patent Document 3] Patent No. 2671242 Summary of the Invention [Problem to be solved by the invention]

[0006] When the cosmetic to be pressed into a mold is a solid powder cosmetic, it is sometimes desirable to form a depression of a predetermined shape on the periphery of the solid powder cosmetic from the standpoint of aesthetics and design, but it is difficult to meet such a requirement with the methods shown in Patent Documents 1 to 3. The present invention has been made in view of the above circumstances, and has as its object to provide a method for producing a solid powder cosmetic that can reliably form a depression of a predetermined shape on the periphery of the solid powder cosmetic. [Means for solving the problem]

[0007] The method for producing a solid powder cosmetic according to the present invention comprises the steps of: A method for producing a solid powder cosmetic by pressing a powder cosmetic filled in a bottomed cylindrical container to form a mold, the method comprising: a pre-pressing step of pressing the powder cosmetic material using a pre-pressing press head having a flat press surface facing the container; a final molding step in which, after the preliminary molding step, the powder cosmetic is pressed and final molded using a final molding press head in which the peripheral portion of the press surface facing the container protrudes toward the container beyond the area surrounded by the peripheral portion; It is characterized by having:

[0008] In the method for producing a solid powder cosmetic according to the present invention, the press head for the mold may be used to stamp a predetermined pattern into the surface of the solid powder cosmetic. Also, in the method for producing a solid powder cosmetic according to the present invention, the peripheral edge of the press head for the mold may have a flat or concave inclined surface that is inclined so that the amount of protrusion gradually decreases from the outer periphery toward the inner periphery. [Effects of the Invention]

[0009] In the method for producing a solid powder cosmetic according to the present invention, a temporary pressing step is performed in which the powder cosmetic is pressed and temporarily pressed using a temporary pressing head with a flat press surface, and then a final pressing step is performed in which the powder cosmetic is pressed using a final pressing head with a peripheral edge of the press surface that protrudes further toward the container than the area surrounded by the peripheral edge, thereby making it possible to reliably form a depression of a predetermined shape on the peripheral edge of the solid powder cosmetic. Furthermore, by performing the temporary pressing step and the subsequent final pressing step as described above, it is possible to minimize collapse of the mold and to keep the thickness of burrs that occur during molding to a minimum. [Brief explanation of the drawings]

[0010] [Figure 1] 1 is a schematic diagram illustrating steps (1) to (4) of a method for producing a solid powder cosmetic according to one embodiment of the present invention. [Figure 2] FIG. 1 is a perspective view showing a press head for a temporary pressing mold used in the method for producing the solid powder cosmetic. [Figure 3] FIG. 1 is a perspective view showing a press head for a mold used in the method for producing the solid powder cosmetic. [Figure 4] FIG. 10 is a perspective view showing another example of a press head for a main die; [Figure 5] A plan view showing an example of a molded solid powder cosmetic. [Figure 6] 6 is an enlarged schematic diagram showing a portion of the solid powder cosmetic shown in FIG. [Figure 7] A diagram showing the distance between each part of a sample of a solid powder cosmetic and the inner plate. [Figure 8] FIG. 8 is a diagram showing the distance between each part and the inner plate in a sample different from the sample in FIG. 7. [Figure 9] 10A and 10B show the distance between each part and the inner plate in different samples. [Figure 10] 10A and 10B show the distance between each part and the inner plate in different samples. [Figure 11] A diagram showing the distance between each part of the sample shown in Figures 7 to 10 and the inner plate. [Figure 12] Figure showing the mean, median, and standard deviation of the distances shown in Figs. [Figure 13] FIG. 1 shows the dimensions of burrs on a sample of a solid powder cosmetic. [Figure 14] A diagram showing the dimensions of burrs on a sample different from the sample in Figure 13. [Figure 15] Further diagram showing the burr dimensions for different samples [Figure 16] Further diagram showing the burr dimensions for different samples DETAILED DESCRIPTION OF THE INVENTION

[0011] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Fig. 1 (1) to (4) are a schematic diagram showing the sequential time-series steps for producing an embossed solid powder cosmetic S according to one embodiment of the present invention. In this embodiment, as shown in Fig. 1 (1), a container holder 1 having a recess 1a is used, and an inner tray 2, which is a bottomed container, is housed and held within the recess 1a. A press head 3 for a temporary pressing mold is disposed in a position facing the inner tray 2 from above. The lower surface of this press head 3 for a temporary pressing mold in the figure is the pressing surface 3a, and its upper surface 3b is connected to a vertically movable member 4. The vertically movable member 4 is capable of reciprocating up and down a predetermined stroke by a drive mechanism (not shown).

[0012] The inner tray 2 has, for example, a roughly rectangular bottom plate 2a and side plates 2b that protrude from the periphery of the bottom plate 2a. The side plates 2b are formed in an annular shape overall, and define an open space on the inside. Next, inside the inner tray 2, that is, the side plates 2 b A predetermined amount of powder cosmetic material S is filled into the space surrounded by the side plates 2. b Specific examples of the powder cosmetic S include solid powder foundation and solid powder eye shadow.

[0013] 2 shows a perspective view of the press head 3 for the temporary pressing die, as seen from the side of its press surface 3a. As shown here, the press surface 3a that presses the powder cosmetic S is roughly rectangular and is basically a uniform plane, that is, a surface without any irregularities in the thickness direction of the head. On the other hand, the upper surface 3b of the press head 3 for the temporary pressing die is, as an example, a roughly rectangular shape, with the central portion, which is almost the entire surface, being a uniform plane, and the peripheral portion of the narrow area surrounding it being a smoothly curved surface that gradually approaches the press surface 3a from the central portion outward. The press head 3 for the temporary pressing die is made of the side plates 2 of the inner plate 2. b The size is such that it can tightly enter the space surrounded by the

[0014] 1(1), the temporary pressing step is performed. That is, the vertically movable member 4 is lowered, and the temporary pressing press head 3 is placed on the side plate 2 of the inner plate 2. b The press head 3 then enters the space surrounded by the inner tray 2 and presses the powder cosmetic material S in the inner tray 2 from above with the press surface 3a to perform a pressing process. Figure 1 (2) shows the state at this time. As shown here, the upper surface of the powder cosmetic material S is pressed into a flat, planar shape by being pressed by the press surface 3a. After this pressing process, the vertically movable member 4 is raised, and the press head 3 for the temporary pressing mold moves upward away from the powder cosmetic material S.

[0015] After the above temporary die forming steps are completed, the temporary die press head 3 is replaced by the final die press head 5, which is positioned above the inner plate 2. (3) in Figure 1 shows this state. The final die press head 5 has a press surface 5a on its underside, and its upper surface 5b is connected to a vertically movable member 6. The vertically movable member 6, like the vertically movable member 4, can be reciprocated up and down a predetermined stroke by a drive mechanism (not shown). Instead of using a vertically movable member 6 separate from the vertically movable member 4, the vertically movable member 4 can be used as is, and the final die press head 5 can be connected to the vertically movable member 4 instead of the temporary die press head 3.

[0016] Figure 3 shows a perspective view of the press head 5 for this purpose, viewed from the press surface 5a side. As shown here, the roughly rectangular press surface 5a that presses the powder cosmetic material S is not uniformly flat, but has irregularities in the thickness direction of the head. That is, the press surface 5a has a roughly rectangular central portion 5c and a peripheral portion 5d that surrounds this central portion 5c on all four sides, with the peripheral portion 5d being slightly thicker overall than the central portion 5c. More specifically, this peripheral portion 5d is formed so as to press a wave-like pattern into the powder cosmetic material S, and is composed of multiple thin protrusions extending in one direction and arranged side by side in a direction perpendicular to this direction. Each of these thin protrusions is shaped to create a wave-like cross-sectional space between adjacent ones.

[0017] When the actual pressing step described later is performed, the press head 5 for the actual pressing and the inner plate 2 are first placed in the state shown in FIG. 1(3), so it can be said that the peripheral portion 5d of the pressing surface 5a is formed in a state that protrudes toward the inner plate 2 side compared to the central portion 5c. bThe press head 5 is sized to be able to tightly enter the space surrounded by the rectangular press surface 5a. Specifically, the lengths of the long and short sides of the roughly rectangular press head 5 for the final die are 48 mm and 40 mm, respectively, although this is not a limitation. The lengths of the long and short sides of the press head 3 for the preliminary die are also approximately the same as those mentioned above. Furthermore, the protruding height of the peripheral edge 5d of the press surface 5a relative to the central portion 5c is approximately 0.45 mm.

[0018] 1(3), the actual pressing step is carried out. That is, the vertically movable member 6 is lowered, and the actual pressing press head 5 is moved to the side plate 2 of the inner plate 2. b The press head 5 enters the space surrounded by the press surface 5a and presses the powder cosmetic material S in the inner tray 2 from above with the press surface 5a. After this pressing process, the vertically movable member 6 is raised, and the main press head 5 for pressing the powder cosmetic material S moves upward. Figure 1 (4) shows the state at this time. As shown here, the portion S1 of the upper surface of the powder cosmetic material S pressed against the peripheral portion 5d of the press surface 5a is pressed (embossed) into a state in which multiple grooves that have a wavy cross section and extend in a direction perpendicular to the display surface of the figure are lined up and repeated in the left-right direction of the figure.

[0019] The portion S1 of the powder cosmetic S pressed as described above is pre-pressed flat by the pre-press head 3, which has a flat press surface 3a, before being pressed into the final shape by the press head 5. This allows the grooves with a wavy cross section to be neatly formed into the desired wavy cross section without significant deformation.

[0020] It should be noted that the main pressing head for stamping a predetermined pattern into the surface of the powder cosmetic S is not limited to the main pressing head 5 used in this embodiment. Figure 4 shows another example of such a main pressing head. The main pressing head 15 shown here has a roughly rectangular central portion 15c and a peripheral portion 15d surrounding this central portion 15c on all four sides, with the peripheral portion 15d being thicker overall than the central portion 15c. The peripheral portion 15d is formed so as to stamp a pattern of repeating thin stripes with a rectangular cross section into the powder cosmetic S, and is composed of multiple thin protrusions with a rectangular cross section extending in one direction, arranged side by side at small intervals from each other in a direction perpendicular to this direction.

[0021] Here, the results of an investigation into how moldability changes depending on the press head used and the order of use are described with reference to Figures 5 to 12. The press head 3 used for the temporary mold in the above embodiment is referred to as the flat head, and the press head 5 used for the final mold in the above embodiment is referred to as the concave head because it forms a concave portion around the periphery of the solid powder cosmetic. When using these two types of press heads for molding, the following four combinations of press heads and their order of use were set. "Flat → Flat" indicates temporary molding with a flat head followed by final molding with the same flat head, "Flat → Concave" indicates temporary molding with a flat head followed by final molding with the concave head, "Concave → Flat" indicates temporary molding with a concave head followed by final molding with the flat head, and "Concave → Concave" indicates temporary molding with a concave head followed by final molding with the same concave head. As in the above embodiment, molding was performed using the inner plate 2 (see Figure 1). The flat head and concave head used here have long and short sides of 48 mm and 40 mm, respectively, as exemplified above, and the powder cosmetic material S pressed into the mold is, for example, a powder solid foundation or a powder solid eye shadow.

[0022] In order to determine the quality of moldability, the distance between the molding edge of the solid powder cosmetic material S and the inner plate was measured for each of the solid powder cosmetic materials S pressed into the mold in the four cases described above. This distance will be explained with reference to Figs. 5 and 6. Fig. 5 is a plan view showing the solid powder cosmetic material S embossed using, for example, the device shown in Fig. 1, as viewed from the processed surface. S1 in the figure is the portion pressed by the peripheral edge 5d of the pressing surface 5a of the pressing head 5 for the mold. Measurements of the above distance for one solid powder cosmetic material S were made in the portion along the long sides of the solid powder cosmetic material S as indicated by a in the figure, in the four corners of the solid powder cosmetic material S as indicated by b, and in the portion along the short sides of the solid powder cosmetic material S as indicated by c in the figure.

[0023] The above distance was measured using a 3D video microscope with the solid powder cosmetic material S placed in the inner tray 2 as shown in Figure 6. In the figure, 2d indicates the inner peripheral surface of the inner tray 2, and Sd indicates the molded edge of the solid powder cosmetic material S. To explain in more detail, the distance D between the inner peripheral surface 2d of the inner tray 2 and the molded edge Sd shown in the figure is the distance to be measured. The smaller this distance D is, the less deformation there will be in the mold and the better the moldability will be. However, due to deformation, the molded edge Sd has an irregular shape. Therefore, when measuring the above-mentioned portions along the long sides, the four corners, and the short sides, measurements were taken at a fixed position for each portion (for example, in the portion along the short sides, the midpoint between a pair of long sides). In this example, one sample of the solid powder cosmetic material S pressed into a mold for each of the four cases above was prepared, for a total of four samples, and the above three parts of each sample were measured multiple times (2 to 4 times). The above "constant position" was common to all four samples and also common to the multiple measurements.

[0024] The measurement results of the distance D are shown in μm units in Figures 7 to 10. Specifically, the measurement results for samples stamped in the "flat → flat," "flat → concave," "concave → flat," and "concave → concave" directions are shown in Figures 7, 8, 9, and 10, respectively, in that order. Measurements using the 3D video microscope mentioned earlier can be difficult depending on the measurement position, so it may not be possible to measure the three areas mentioned above the same number of times. Therefore, for the sample stamped in the "flat → flat" direction shown in Figure 7, for example, measurements were taken three times along the long side, four times along the four sides, and two times along the short side.

[0025] As described above, the distance D was measured 9 times, 9 times, 11 times, and 10 times for samples that were struck in the "flat → flat," "flat → concave," "concave → flat," and "concave → concave" directions, and the results are summarized in Figure 11. The mean, median, and standard deviation of the measured distance D for each sample are shown in Figure 12. As can be seen from Figure 12, the distance D is shortest when struck in the "concave → concave" direction.

[0026] However, in this case, because the solid powder cosmetic material S is pressed twice with the concave head, it was found that a step occurs in the solid powder cosmetic material S at a position corresponding to the step of the concave head. This was confirmed using the 3D video microscope mentioned above. Therefore, in order to prevent the occurrence of this step while minimizing mold collapse, it is said that it is most desirable to perform molding in the "flat → concave" direction, which shortens the distance D after "concave → concave," in other words, to perform temporary molding with the flat head and then final molding with the concave head.

[0027] Next, the shape of burrs remaining on the periphery of the pressed solid powder cosmetic S will be described with reference to Figures 13 to 16. As mentioned above, the shapes of burrs were measured for samples pressed in the "flat → flat," "flat → concave," "concave → flat," and "concave → concave" directions, and the results are shown in Figures 13, 14, 15, and 16, in that order. In each figure, the "long side" indicates the shape of burrs that occurred along the long side of the solid powder cosmetic S, as mentioned above, the "short side" indicates the shape of burrs that occurred along the short side of the solid powder cosmetic S, and the "four sides" indicate the shape of burrs that occurred on the four sides (corners) of the solid powder cosmetic S.

[0028] The shape of the burr is shown in each figure from top to bottom in terms of width, length, and thickness (units: μm). For the "long side" and "short side," three numbers are listed side by side, indicating measurements taken at three points dividing each side into four equal parts. For the "four sides," the measurement is taken at a single point exactly in the center of the corner. The average and standard deviation for the burr thickness on the "long side" and "short side" are shown in the right margin. From the measurement results shown in Figures 13 to 16, it can be said that in order to minimize burr thickness, it is best to perform the "flat → concave" molding, that is, to perform the preliminary molding with a flat head and then the final molding with a concave head. [Explanation of symbols]

[0029] 1 Container holder 1a Recess of container holder 2 medium plates 2a Bottom plate of the middle plate 2b Side plate of the middle plate 3 Press head for temporary die 3a Press surface of temporary die press head 3b Top surface of press head for temporary die 4 Vertical movement member 5-die press head 5a Press surface of the press head for the main die 5b Top surface of the press head for the main die 5c Center of the press head for the main die 5d Periphery of the press head for the main die 6 Vertical movement member 15-piece die press head 15a Press surface of the press head for the main die 15b Top surface of the press head for the main die 15c Center of the press head for the main die 15d Periphery of the press head for the main die S Solid powder cosmetics Sd Molding edge of solid powder cosmetic

Claims

1. A method for producing a solid powder cosmetic by pressing a powder cosmetic filled in a bottomed cylindrical container to form a mold, the method comprising: a pre-pressing step of pressing the powder cosmetic material using a pre-pressing head having a flat press surface facing the container; a final molding step in which, after the preliminary molding step, the powder cosmetic is pressed and final molded using a final molding press head in which the peripheral portion of the press surface facing the container protrudes toward the container beyond the area surrounded by the peripheral portion; and The peripheral edge portion is formed by stamping a wave-like pattern into the powder cosmetic, and is composed of a plurality of protrusions extending in one direction, arranged side by side in a direction perpendicular to this direction, and each of the protrusions has a shape that creates a wave-like space in cross section between adjacent protrusions, or The peripheral portion is formed by stamping a pattern of repeating thin stripes with a rectangular cross section into the powder cosmetic, and a plurality of convex portions with a rectangular cross section extending in one direction are arranged side by side at intervals in a direction perpendicular to this direction.

2. 2. The method for producing a solid powder cosmetic according to claim 1, wherein the portion surrounded by the peripheral edge of the main pressing head is a central portion of the pressing surface of the main pressing head that faces the container.

3. 3. The method for producing a solid powder cosmetic according to claim 1, wherein the peripheral edge of the press head for the main mold has a flat or concave inclined surface that is inclined so that the amount of protrusion gradually decreases from the outer periphery toward the inner periphery.

4. The method for producing a solid powder cosmetic according to any one of claims 1 to 3, wherein a predetermined pattern is stamped onto the surface of the solid powder cosmetic by the main stamping press head.

5. A method for producing a solid powder cosmetic by pressing a powder cosmetic filled in a bottomed cylindrical container to form a mold, the method comprising: a pre-pressing step of pressing the powder cosmetic material using a pre-pressing press head having a flat press surface facing the container; a final molding step in which, after the preliminary molding step, the powder cosmetic is pressed and final molded using a final molding press head having a peripheral portion surrounding a central portion of a press surface facing the container, the peripheral portion protruding toward the container side beyond the central portion surrounded by the peripheral portion; and A method for producing a solid powder cosmetic, wherein the central portion is rectangular.

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