JP5073473B2 - Molding method for solid powder cosmetics - Google Patents

Description

  The present invention relates to a method for forming a solid powder cosmetic, and more particularly to a pressing aid used when pressing a filling in a filling dish.

  Solid powder cosmetics such as foundations and eye shadows include dry-type cosmetics and wet-type cosmetics. Dry molding cosmetics are solidified by compression-molding cosmetic powder, and wet molded cosmetics are solidified by absorbing and drying volatile components in slurry (cosmetic fluid). It is. Wet molded cosmetics have a characteristic that a moist and smooth use feeling can be obtained due to the sparse particle density compared to dry molded cosmetics.

  In general, in the pressing process of solid powder cosmetics, a press plate (male mold) and a filling dish (female mold) are used to prevent the filling dish from being damaged or to improve productivity. A clearance is provided between them, and a sheet-like pressing aid is interposed here, and pressing is performed. Regarding the clearance corresponding to the difference (distance) between the outer circumference of the press plate and the inner circumference of the filling pan, the specific value is set in consideration of various factors including the characteristics of the filling material filled in the filling pan. Is done. Conventionally, as an auxiliary tool for pressing, one having a thickness smaller than the clearance or one having almost the same thickness as this is used.

  In Patent Document 1, a pressing aid (thin paper) is interposed between the filling plate and the pattern board when pressing the pattern board with the uneven pattern on the surface of the dry-type cosmetic. A method of doing this is disclosed. Further, in Patent Document 2, when the slurry filled in the filling plate is compressed and sucked by the press plate, a pressing auxiliary tool (absorbing sheet) is interposed between the filling plate and the press plate, and this is performed. Is disclosed. These Patent Documents 1 and 2 do not disclose or suggest the specific thickness of the pressing aid.

JP-A-8-154732 JP-A-2005-143606

  In the solid powder cosmetics molded using the above-mentioned conventional pressing aid, cracks and sink marks of the cosmetics occur at the four corners of the filling dish, and the cosmetic hardness varies between the four corners and the other corners. There was something to do. In particular, in the wet filling, the cosmetic material is thinned and easily cracked due to the removal of the solvent. These problems cause a reduction in impact resistance, which is one of the quality of products. In addition, when wet molding is performed using a conventional pressing aid, there is a problem that the slurry leaks out from the clearance and the outer surface of the filling dish is soiled. As a result of repeated experiments and studies to solve these problems, the present inventor has come up with a solution that can solve this simply and at low cost.

  This invention is made | formed in view of this situation, The objective is aiming at the improvement of the impact resistance of solid powder cosmetics.

The present invention includes a step of filling a filling plate with a filling material, and a pressing plate that is pressed between the filling plate and the press plate with a stretchable pressing aid interposed therebetween, thereby A method for producing a solid powder cosmetic comprising the step of pressing a filling filled in the powder. Here, the auxiliary tool for pressing has a thickness larger than the largest clearance among the entire circumference of the clearance formed between the inner periphery of the filling plate and the outer periphery of the press plate.

Here, in this invention, it is preferable that the thickness of the auxiliary tool for a press is larger than the distance between the inner periphery of a filling tray and the outer periphery of a press plate in the refracted corner part.

Further, in the present invention, in the form in which each of the inner periphery of the filling plate and the outer periphery of the press plate has a rectangular shape, the thickness of the auxiliary tool for pressing is the inner periphery of the filling plate in a linear portion extending linearly. It is preferably larger than the value obtained by multiplying the distance between the press plate and the outer periphery by √2.

Furthermore, in the present invention, the filler may be a slurry obtained by mixing a cosmetic base material and a volatile solvent, which is used for forming a wet-shaped cosmetic, or for forming a dry-type cosmetic. It may be a powdery cosmetic material used in the above.

According to the present invention, the pressing aid has a thickness larger than the largest clearance among the clearances between the filling pan and the press plate. The portion where the clearance is narrow is blocked by the deformation of the pressing aid. Thereby, the press shortage with respect to the filling of a corner part is relieved, and the press pressure added to the surface of a filling becomes substantially uniform over the whole. Therefore, it is possible to effectively suppress a decrease in impact resistance due to a press shortage.

  Hereinafter, a method for forming a solid powder cosmetic such as a foundation or eye shadow will be described with reference to FIGS. 1 and 2.

  FIG. 1 is an explanatory diagram of the filling process. First, the filling dish 1 is prepared. This filling dish 1 has a rectangular shape, and the upper part is opened. Next, the opening of the filling dish 1 is covered with the molding head 2. The forming head 2 is mainly composed of a rectangular plate-shaped head portion 2a and a hollow supply pipe 2b, and is used as a forming head for filling slurry as a filling material. Both the head portion 2a and the supply pipe 2b are made of metal, and both are firmly integrated. A horizontal and flat scraping plane is formed below the head portion 2a. This scraping plane has two roles. One is the role of covering the opening of the filling dish 1 to form a slurry filling space. The other role is to scrape off the slurry filled in the filling space. On the other hand, the supply pipe 2b is attached by welding or the like at a position offset to the left above the head portion 2a. The supply pipe 2b is used for guiding slurry supplied from the outside to the head portion 2a. The slurry is a mixture of a cosmetic base material of a solid powder cosmetic such as foundation, face powder, or eye shadow and a volatile solvent such as ethanol, water, liquid paraffin, isoparaffin, isopropyl alcohol. Note that an injection hole (not shown) communicating with the supply pipe 2b is provided on the lower surface of the head portion 2a. By pressurizing the inside of the supply pipe 2b, the slurry discharged from the injection hole is injected into the filling dish 1.

  When the filling of the slurry is completed, the filling dish 1 is moved relative to the forming head 2 in the horizontal direction while the forming head 2 is lowered. Thus, the slurry filled in the filling dish 1 is scraped off by the scraping plane of the head portion 2a. By this abrasion, the height of the slurry surface becomes equivalent to the height corresponding to the upper edge of the filling dish 1.

  The slurry may be filled not by front filling as described above but by back filling. In the case of back-filling, the slurry is filled into the filling dish 1 through the inlet provided at the bottom of the filling dish 1 with the opening of the filling dish 1 being closed.

  FIG. 2 is an explanatory diagram of the pressing process. The slurry scraped off to the upper edge of the filling dish 1 is pressed from above by a press plate 3 having a rectangular shape. In this step, for example, a porous member may be used as the press plate 3 in order to remove the volatile components of the slurry. Between the press plate 3 and the filling dish 1, a sheet-like pressing auxiliary tool 4 is interposed. The auxiliary tool 4 for press has elasticity and has the thickness D mentioned later. As such a pressing aid 4, a fiber sheet, a sponge sheet, a cotton sheet, or the like can be used. Examples of the fibers include natural fibers, synthetic fibers, blends, woven fabrics, and nonwoven fabrics thereof. In addition, a rubber sheet made of urethane rubber, silicon rubber, or the like, or a paper sheet may be used. In addition, when the auxiliary tool 4 for a press is a raw material which does not absorb a solvent, the sheet | seat which can absorb a solvent may be used together, and in the case of a rubber plate, you may provide a suction hole in this. The thickness D may be achieved as a result of overlapping a plurality of sheets.

  The slurry filled in the filling dish 1 is pressed by pushing down the pressing plate 3 with the pressing auxiliary tool 4 interposed. At that time, the volatile solvent oozing out from the filling is absorbed by the auxiliary pressing tool 4 interposed between the filling dish 1 and the press plate 3 and is sucked into the suction holes formed in the press plate 3. . The volatile solvent sucked into the suction hole is discharged to the outside through a chamber (not shown) in the press plate 3. The removal of the volatile solvent may be performed only by the auxiliary tool 4 for pressing, not by suction through the suction hole. Thereafter, the residual volatile components in the filling are dried and removed, whereby a solid powder cosmetic product is completed.

  The feature of this embodiment is that the clearance formed between the inner periphery of the filling dish 1 and the outer periphery of the press plate 3 is set over the entire circumference by appropriately setting the thickness D of the auxiliary tool 4 for pressing. It is in the blocked point. This point will be described with reference to FIGS.

  FIG. 3 is an enlarged view of a main part showing a state between the pressed plate 3 and the filling dish 1 that are pressed down in the pressing process. A predetermined gap, that is, a clearance, is formed between the inner periphery of the filling dish 1 (female mold) and the outer periphery of the press plate 3 (male mold). The reason for forming this is to prevent the filling dish 1 from being damaged in the pressing process, and to improve the productivity by improving the die cutting in the pressing process. Here, when the clearance at the linear portion extending linearly is C1, this clearance C1 corresponds to the distance between the linear inner periphery of the filling dish 1 and the linear outer periphery of the press plate 3. . The clearance C1 is often set to about C1 = 0.075 to 0.15 mm in wet molding (C1 = 0.15 to 0.3 mm in dry molding). On the other hand, when the clearance at the refracted corner portion R (including the chamfered bent portion) is C2, the clearance C2 is the distance between the inner peripheral corner of the filling plate 1 and the outer peripheral corner of the press plate 3. It corresponds to. As can be seen from the figure, the clearance C2 of the corner portion R is larger than the clearance C1 of the straight portion. When both the filling plate 1 and the press plate 3 are rectangular, the clearance C2 is a value obtained by multiplying the clearance C1 by √2 from the relationship of the ratio of each side of the right-angled isosceles triangle (1: 1: √2). Become.

  FIG. 4 is a diagram illustrating a state where the clearance is blocked by the pressing auxiliary tool 4 in the pressing step. In order to close the clearance over the entire circumference, it is only necessary that the thickness D of the auxiliary pressing tool 4 be larger than the largest value of the clearances around the entire circumference. When both the filling plate 1 and the press plate 3 are rectangular, the maximum clearance is the clearance C2 of the corner portion R. Therefore, if the auxiliary pressing tool 4 having a thickness D larger than the clearance C2 is used, the clearance can be blocked over the entire circumference. At that time, the straight portion having a narrow clearance is effectively blocked by the contraction deformation of the pressing auxiliary tool 4 having stretchability.

  As described above, in this embodiment, the auxiliary pressing tool 4 has a thickness D that covers the entire circumference of the clearance formed between the inner periphery of the filling plate 1 and the outer periphery of the press plate 3. Is used. Thereby, the fall of the impact resistance of solid powder cosmetics can be suppressed effectively. As in the comparative example shown in FIG. 5, when the solid powder cosmetic is molded using the pressing auxiliary tool 4 ′ with D ≦ C1, the clearance of the corner portion R cannot be completely blocked, A gap is created in a part. In this case, a sufficient press pressure is not applied to the filling corresponding to this gap, and the cosmetic material cracks or sinks at the corner portion R, or the hardness of the cosmetic material varies between the corner portion R and the rest. End up. On the other hand, according to the present embodiment, by effectively blocking the escape path of the press pressure at the corner portion R, the press shortage with respect to the filling at the corner portion R can be alleviated, and the press pressure applied to the surface of the filling is entirely It can be almost uniform over the entire area. As a result, it is possible to ensure the impact resistance required for the product with only a simple modification such as a change of the auxiliary tool for pressing 4 without improving the manufacturing apparatus or adding a new process. Become.

  Further, according to the present embodiment, since the entire circumference of the clearance is blocked by the pressing auxiliary tool 4, it is possible to effectively prevent the slurry filled in the filling dish 1 from leaking during pressing. . Accordingly, it is possible to prevent a situation in which the outer surface of the filling dish 1 is soiled, so that an operation of wiping it out is unnecessary, and the productivity can be improved.

  Usually, since a flat rigid body is used for the press plate 3 (male mold), powders are densely arranged in the outermost surface state of the cosmetics press-molded thereby. At the beginning of use, the powder is taken off from the surface when used repeatedly, giving a hard impression. In this embodiment, since the press auxiliary tools 4 and 4 ′ having a predetermined thickness D or more are interposed between the press plate 3 and the filler, the features such as hardness and shape of the press plate 3 (rigid body) are reduced, and the makeup The outermost surface of the material is also softly molded.

  In the above-described embodiment, the case where both the filling plate 1 and the press plate 3 are rectangular has been described as an example. However, the present invention is not limited to this, and a circular shape or other complex shape is provided on the condition that the pressing aid 4 having a thickness D larger than the maximum value in the entire circumference of the clearance is used. It is applicable to various shapes including. The upper limit value regarding the thickness D of the auxiliary pressing tool 4 is not particularly limited, and the expansion / contraction characteristics (elasticity characteristics) of the pressing auxiliary tool 4 and the ease of punching of the male press plate 3 are easy to remove. It is sufficient to determine appropriately considering the above.

  In the above-described embodiment, wet molding has been described as an example. Wet molding is the most suitable application example of the present invention because the cosmetic is thin and easily cracked due to the removal of the solvent, but the present invention can also be applied to dry molding that presses cosmetic powders. It is.

  Further, in the above-described embodiment, as the pressing auxiliary tools 4 and 4 ′, a sheet-like member having a larger area and relatively thin and deformable than the male and female dies is assumed. An elastic member having a thickness equivalent to the area may be used. In this case, when the elastic member is pressed in the thickness direction, the elastic member expands in the surface direction, thereby closing the clearance between the male mold and the female mold.

Explanatory drawing of filling process Explanatory drawing of pressing process The principal part enlarged view which shows the state between a press plate and a filling plate The figure which shows the state in which the clearance in this embodiment was obstruct | occluded The figure which shows the state in which the clearance in a comparative example was block | closed

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Filling dish 2 Forming head 2a Head part 2b Supply pipe 3 Press plate 4, 4 'Auxiliary tool for press

Claims (5)

In the method of forming a solid powder cosmetic,
Filling the filling dish with filling material;
Pressing the filling material filled in the filling plate by pressing down the pressing plate with a pressing auxiliary tool having elasticity between the filling plate and the pressing plate; Have
The auxiliary powder for pressing has a thickness larger than the largest clearance among all clearances formed between the inner periphery of the filling plate and the outer periphery of the press plate. Molding method.   2. The solid powder makeup according to claim 1, wherein the thickness of the auxiliary tool for pressing is larger than the distance between the inner periphery of the filling dish and the outer periphery of the press plate at the refracted corner portion. Molding method. Each of the inner periphery of the filling dish and the outer periphery of the press plate has a rectangular shape,
The thickness of the auxiliary tool for pressing is larger than a value obtained by multiplying the distance between the inner periphery of the filling dish and the outer periphery of the press plate by √2 in a linear portion extending linearly. The method for forming a solid powder cosmetic according to claim 1.   4. The filler according to claim 1, wherein the filler is a slurry obtained by mixing a cosmetic base material and a volatile solvent, which is used to form a wet-shaped cosmetic. Solid powder cosmetic molding method.   The method for molding a solid powder cosmetic according to any one of claims 1 to 3, wherein the filling is a cosmetic powder used to form a dry-type cosmetic.

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