JP7758412B2 - Manufacturing method for solid powder cosmetics - Google Patents

Description

The present invention relates to a method for producing solid powder cosmetics, and more particularly to a method for producing solid powder cosmetics in which powder cosmetics filled in a container are pressed into a mold.

Conventionally, as shown in Patent Documents 1 to 3, for example, when producing solid cosmetics, it is common to press powder or slurry cosmetics to form a mold. In particular, Patent Documents 1 to 3 propose that the pressing process involves a first pressing, or temporary pressing, and a second pressing, or final pressing, which follows 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.

More specifically, in the methods shown in Patent Documents 1 and 2, the preliminary molding step is performed using a press head (hereinafter referred to as a concave head) in which the peripheral edge of the surface facing the cosmetic to be molded protrudes further toward the container than 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) in which the surface facing the cosmetic to be molded is essentially flat. Furthermore, in the method shown in Patent Document 3, both the preliminary molding step and the final molding step are performed using a concave head.

The method disclosed in Patent Document 1 employs the above-described configuration, which makes it possible to reduce burrs remaining on the peripheral edges of the cosmetic material. Furthermore, the method disclosed in Patent Document 2 employs the above-described configuration, which makes it possible to compress and mold the slurry cosmetic material 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 material with a uniform hardness.

Patent No. 6284801 Japanese Patent Application Laid-Open No. 2010-106002 Patent No. 2671242

However, when the cosmetic to be pressed into a mold is a solid powder cosmetic, it is sometimes desirable to form a predetermined shaped depression on the periphery of the solid powder cosmetic from the standpoint of aesthetics and design, but it is difficult to meet this requirement with the methods shown in Patent Documents 1 to 3. The present invention was made in light of the above circumstances, and aims to provide a method for manufacturing solid powder cosmetics that can reliably form a predetermined shaped depression on the periphery of the solid powder cosmetic.

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:

In addition, 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. Furthermore, 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 gradually reduces in protrusion from the outer periphery toward the inner periphery.

In the method for producing a solid powder cosmetic according to the present invention, a preliminary molding step is performed in which the powder cosmetic is pressed and molded using a press head for a preliminary mold with a flat press surface, and then a final molding step is performed in which the powder cosmetic is molded using a press head for a final mold in which the peripheral edge of the press surface protrudes further toward the container than the area surrounded by the peripheral edge. This ensures that a predetermined shaped depression can be formed on the peripheral edge of the solid powder cosmetic. Furthermore, by performing the preliminary molding step and the subsequent final molding step as described above, molding collapse can be minimized and the thickness of burrs that occur during molding can be kept small.

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. 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. FIG. 1 is a perspective view showing a press head for a mold used in the method for producing the solid powder cosmetic. FIG. 10 is a perspective view showing another example of a press head for a main die; A plan view showing an example of a molded solid powder cosmetic. FIG. 6 is an enlarged schematic view of a portion of the solid powder cosmetic material shown in FIG. A diagram showing the distance between each part of a sample of a solid powder cosmetic and the inner plate. 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 . 10A and 10B show the distance between each part and the inner plate in different samples. 10A and 10B show the distance between each part and the inner plate in different samples. A diagram showing the distance between each part of the sample shown in Figures 7 to 10 and the inner plate. Figure 11 shows the mean, median and standard deviation of the distances shown in Figs. FIG. 1 shows the dimensions of burrs on a sample of a solid powder cosmetic. FIG. 14 is a diagram showing the dimensions of burrs in a sample different from the sample in FIG. 13 . Further diagram showing the burr dimensions for different samples Further diagram showing the burr dimensions for different samples

Embodiments of the present invention will now be described with reference to the drawings. Figures 1 (1) to (4) schematically show the sequential chronological steps for producing an embossed solid powder cosmetic S according to one embodiment of the present invention. In this embodiment, as shown in Figure 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 mold is disposed in a position facing the inner tray 2 from above. The lower surface of this press head 3 for a temporary mold in the figure is the press 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).

The inner tray 2 has, for example, a roughly rectangular bottom plate 2a and side plates 2b protruding from the peripheral edge of the bottom plate 2a. The side plates 2b are formed in an annular shape overall, defining an open space inside. A predetermined amount of powder cosmetic material S is then filled into the inner tray 2, i.e., the space surrounded by the side plates 2b . The amount of powder cosmetic material S filled is set so that it does not exceed the top edge of the side plates 2b . Specific examples of powder cosmetic material S include solid powder foundation and solid powder eye shadow.

2 shows a perspective view of the press head 3 for the temporary pressing mold, viewed from the press surface 3a side. As shown here, the press surface 3a that presses the powder cosmetic S is roughly rectangular and is essentially 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 mold is, as an example, a roughly rectangular shape, with the central portion, which makes up almost the entire surface, being a uniform plane, and the peripheral portion of the narrow region surrounding this periphery 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 mold is sized so that it can fit tightly into the space surrounded by the side plates 2b of the inner plate 2.

Next, from the state shown in Fig. 1 (1), the temporary pressing step is performed. That is, by lowering the vertically movable member 4, the temporary pressing mold press head 3 enters the space surrounded by the side plates 2b of the inner tray 2, and the powder cosmetic material S in the inner tray 2 is pressed from above with the press surface 3a to perform a pressing process. Fig. 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 temporary pressing mold press head 3 moves upward away from the powder cosmetic material S.

Once the above temporary die step is completed, the temporary die press head 3 is replaced by the final die press head 5, which is positioned above the inner tray 2. Figure 1 (3) 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. Similar to the vertically movable member 4, the vertically movable member 6 is capable of reciprocating up and down a predetermined stroke by a drive mechanism (not shown). Note that instead of using a vertically movable member 6 separate from the vertically movable member 4 in this way, 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 in place of the temporary die press head 3.

Figure 3 shows a perspective view of the above-mentioned pressing head 5, 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, arranged side by side in a direction perpendicular to that direction. Each of these thin protrusions is shaped to create a wave-like cross-sectional space between adjacent ones.

When the final pressing step (described later) is performed, the final pressing press head 5 and the inner plate 2 are first placed in the state shown in FIG. 1 (3), so the peripheral edge 5d of the pressing surface 5a is formed to protrude toward the inner plate 2 compared to the central portion 5c. The final pressing press head 5 is sized to fit tightly into the space enclosed by the side plates 2b of the inner plate 2. Specifically, the lengths of the long and short sides of the roughly rectangular final pressing press head 5 are 48 mm and 40 mm, respectively, although this is not a limitation. The lengths of the long and short sides of the preliminary pressing press head 3 described above are also approximately the same. The protruding height of the peripheral edge 5d relative to the central portion 5c of the pressing surface 5a is approximately 0.45 mm.

Next, from the state shown in Figure 1 (3), the actual pressing step is performed. That is, by lowering the vertically movable member 6, the press head 5 for the actual pressing enters the space surrounded by the side plates 2b of the inner tray 2, and the powder cosmetic material S in the inner tray 2 is pressed from above with the press surface 5a to perform a pressing process. After this pressing process, the vertically movable member 6 is raised, and the press head 5 for the actual pressing moves upward away from the powder cosmetic material S. 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) so that multiple grooves that have a wave-like cross section and extend in a direction perpendicular to the display surface of the figure are lined up in the left-right direction in the figure.

Before being pressed into the final mold using the final press head 5, 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. This allows the cross-sectionally wavy grooves to be neatly formed into the desired cross-sectional wavy shape without significant deformation.

The main pressing head used to stamp a predetermined pattern into the surface of the powder cosmetic material 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 material 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.

Here, we will explain the results of an investigation into how moldability changes depending on the press head used and the order of use, with reference to Figures 5 to 12. In the above embodiment, the press head 3 used for the temporary mold is referred to as the flat head, while the press head 5 used for the final mold is referred to as the concave head, since 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 established. "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 side lengths of 48 mm and 40 mm, respectively, as exemplified above, and the powder cosmetic material S pressed into the mold is, for example, solid powder foundation or solid powder eye shadow.

To determine the moldability of the solid powder cosmetic S pressed into the mold in each of the four ways described above, the distance between the molding edge of the solid powder cosmetic S and the inner plate was measured. This distance will be explained with reference to Figures 5 and 6. Figure 5 is a plan view of the solid powder cosmetic S embossed using the device shown in Figure 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 press. The above distance for one solid powder cosmetic S was measured along the long sides of the solid powder cosmetic S as indicated by a in the figure, along the four corners of the solid powder cosmetic S as indicated by b, and along the short sides of the solid powder cosmetic S as indicated by c in the figure.

The above distances were 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 denotes the inner peripheral surface of the inner tray 2, and Sd denotes the molded edge of the solid powder cosmetic material S. More specifically, 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, the less molding collapse there is and the better moldability can be determined. However, due to molding collapse, the molded edge Sd has an irregular shape. Therefore, when measuring the portions along the long sides, the four corners, and the short sides, measurements were taken at a fixed position for each portion (for example, the midpoint between a pair of long sides for the portions along the short 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 three portions of each sample were measured multiple times (2 to 4 times), but the "constant position" was the same for all four samples and also for all the measurements taken.

The measurement results for the distance D are shown in μm units in Figures 7 to 10. That is, 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. When measuring using the 3D video microscope mentioned above, it can be difficult to measure depending on the measurement position, so it is sometimes not 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 on all four sides, and twice along the short side.

Figure 11 shows the results of measurements of distance D, which were measured 9 times, 9 times, 11 times, and 10 times for samples that were struck in the "flat to flat," "flat to concave," "concave to flat," and "concave to concave" directions, respectively. The mean, median, and standard deviation of the measured distance D are shown for each sample in Figure 12. As can be seen from Figure 12, distance D is shortest when struck in the "concave to concave" direction.

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 in 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 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 the final molding with the concave head.

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 results of measuring the shape of burrs for samples pressed in the "flat → flat", "flat → concave", "concave → flat" and "concave → concave" directions are shown in Figures 13, 14, 15 and 16, respectively, 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.

Regarding the shape of the burrs, each figure shows the horizontal length, vertical length, and thickness (units: μm) from top to bottom. For the "long sides" and "short sides," three numbers are written 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 middle of the corner. The average and standard deviation for the burr thickness on the "long sides" and "short sides" 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 molding in the "flat → concave" order, that is, to perform temporary molding with a flat head and then perform the actual molding with a concave head.

DESCRIPTION OF SYMBOLS 1 Container holder 1a Recess of container holder 2 Inner plate 2a Bottom plate of inner plate 2b Side plate of inner plate 3 Press head for temporary die 3a Press surface of press head for temporary die 3b Top surface of press head for temporary die 4 Vertically moving member 5 Press head for final die 5a Press surface of press head for final die 5b Top surface of press head for final die 5c Center portion of press head for final die 5d Peripheral portion of press head for final die 6 Vertically moving member 15 Press head for final die 15a Press surface of press head for final die 15b Top surface of press head for final die 15c Center portion of press head for final die 15d Peripheral portion of press head for final die S Solid powder cosmetic Sd Molded edge portion of solid powder cosmetic

Claims (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 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. 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. The method for producing a solid powder cosmetic according to claim 1 or 2, wherein the peripheral edge of the press head for the main mold has a flat or concave inclined surface that protrudes gradually less from the outer periphery toward the inner periphery. 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 using the stamping press head. 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 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 .