WO2007007449A1

WO2007007449A1 - Cosmetic applicator and cosmetic applicator molding die

Info

Publication number: WO2007007449A1
Application number: PCT/JP2006/307545
Authority: WO
Inventors: Akihiro Tanaka
Original assignee: Sinwa, Corporation
Priority date: 2005-07-08
Filing date: 2006-04-10
Publication date: 2007-01-18
Also published as: JP2008136495A; JP4783079B2

Abstract

A cosmetic applicator having rows of a large number of fine bristles integrally formed with the head of a handle, wherein the bristles are made softer without increasing the price of the applicator. The cosmetic applicator has rows of a large number of the bristles (24) integrally formed with the head (22) of the handle (20). Each of the bristles has a substantially triangle shape where its rear surface (26) faces one side in the peripheral direction of the head of the handle and two surfaces (29) other than the rear surface (26) face the other side. An extension surface of the rear surface includes the center axis (28) of the head of the handle, and a draft angle is provided at the two surfaces other than the rear surface.

Description

Specification

Cosmetic applicator and cosmetic applicator mold

Technical field

TECHNICAL FIELD [0001] The present invention relates to a cosmetic applicator such as a mascara brush integrally molded from a synthetic resin, and a cosmetic applicator molding die for molding the cosmetic applicator.

Background art

[0002] As shown in Fig. 6, a mascara brush integrally molded from a conventional synthetic resin has a coating portion 5 in which a plurality of brush hairs 14b are implanted in the tip portion 10 of the handle 2. There are some (see Patent Document 1 below). With mascara brush by integral molding, it is difficult to make brush hair 14b thinner than the limit of fluidity of the molding resin. Compared with brush hair in which synthetic fiber is implanted, it feels like a delicate wrinkle, In addition, the touch when directly touching the skin has a drawback of a strong bristle feel. Therefore, in this mascara brush, the cross-section of the brush hair 14a is made triangular so that the brush hair 14a can be easily passed between wrinkles and eyebrows, etc. RU

Patent Document 1: Refer to Japanese Patent Application Laid-Open No. 2004-159823

Disclosure of the invention

Problems to be solved by the invention

By the way, for the mascara brush by integral molding disclosed in Patent Document 1,

There is a request that V, softness and brush hair 14a are necessary.

[0004] Therefore, the present invention has been made in view of the above-described demand, and in an applicator for cosmetics in which a large number of fine and brush hairs having a plurality of rows of force are integrally formed around the tip of the handle, The challenge is to make the brush hair softer without increasing the price.

Means for solving the problem

[0005] In order to solve the above-mentioned problems, the invention according to claim 1 is a cosmetic applicator in which a plurality of brush bristles in a plurality of rows are formed integrally with the tip of the handle. Each bristle has a substantially triangular cross section with the rear side facing one side in the circumferential direction of the tip of the handle and the other side facing the two side surfaces other than the rear side, and the extension surface of the rear side is Inside the tip of the handle Including a mandrel, and two side surfaces other than the rear side surface are provided with a draft angle.

[0006] The invention according to claim 2 is characterized in that, in the invention according to claim 1, an inclined surface, which becomes higher toward the rear side, is formed at the tip of the brush bristles.

[0007] The invention according to claim 3 is characterized in that, in the invention according to claim 1 or 2, the pitch of the brush hairs in each row is changed according to the position in the circumferential direction.

[0008] The invention according to claim 4 is a cosmetic applicator molding die for forming the cosmetic applicator according to claim 1, 2 or 3, wherein the cosmetic applicator molding die comprises: It is characterized by combining fan-shaped mold units, and each mold unit is formed with a V-shaped groove for brush hair formation only on one of the two side surfaces.

The invention's effect

[0009] According to the invention of claim 1, each brush bristle has a substantially triangular cross section in which the rear side faces the one side in the circumferential direction of the tip of the handle and the other side faces the other side other than the rear side. The extended surface of the rear side includes the central axis of the tip of the handle, and two side surfaces other than the rear side are provided with a draft angle, which is completely It means that the front edge of the brush hair formed by two side surfaces other than the rear side surface is inclined toward the rear side surface. Therefore, with this cosmetic applicator, if the eyelashes or eyebrows are handled with the front edge of the brush hairs in front, the brush hairs can easily pass between the eyelashes and eyebrows, and are easily deformed backwards. Thus, a cosmetic applicator that is easy to use can be obtained. In addition, the rear side of the bristle is completely radiating from the central axis of the tip of the handle, and the front edge of the bristle is inclined backwards. The force that uses a combination of dies V-grooves for brush hair formation need only be provided on one side of the die unit. Accordingly, since the mold can be manufactured at low cost, the cosmetic applicator can be manufactured at low cost without increasing the price.

[0010] According to the invention of claim 2, since the inclined surface that is higher toward the rear side is formed at the tip of the bristle, the bristle is more likely to pass between the eyelashes and the eyebrows. Easy to use. [0011] According to the invention of claim 3, since the pitch of the bristles in each row is changed according to the position in the circumferential direction, the bristles having an appropriate pitch are used according to the situation of eyelashes and eyebrows. It can be made easier to use.

[0012] According to the invention according to claim 4, the cosmetic applicator molding die is configured by combining fan-shaped mold units, and each mold unit has one side out of two sides. Since the V-shaped groove for forming the bristle is formed only on this, this cosmetic applicator mold can be manufactured at a low cost, whereby the cosmetic applicator can be manufactured at a low cost.

Brief Description of Drawings

FIG. 1 is a front view of a mascara brush according to one embodiment of the present invention.

FIG. 2 is a side view of a tip portion of the mascara brush.

FIG. 3 is a diagram showing the shape of the bristles of the mascara brush.

FIG. 4 is a sectional view of a mold used for manufacturing the mascara brush.

FIG. 5 is a diagram showing the shape of a mold unit constituting the mold.

FIG. 6 is a diagram showing a conventional mascara brush.

Explanation of symbols

[0014] 20 patterns

22 Tip

24 brush hair

26 Brush hair rear side

28 Centerline of handle tip

29 Brush hair side

30 Brush hair leading edge

32 Brush hair tips

38 Mold

42 Mold unit

46, 48 Side of mold unit

52 V-groove

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a preferred embodiment of a mascara brush that is a cosmetic applicator according to the present invention will be described in detail with reference to FIGS. 1 to 5.

FIG. 1 is a front view of the distal end portion of the handle of the mascara brush. FIG. 2 is a side view of the tip of the handle of the masker brush. FIG. 3 is an enlarged view of the brush hair. FIG. 4 is a diagram illustrating the structure of a mold used for manufacturing a mascara brush. FIG. 5 is a diagram for explaining the shape of a mold unit constituting the mold.

In the mascara brush, as shown in FIGS. 1 and 2, the tip portion 22 of the handle 20 is formed in a cylindrical shape, and 10 rows of tapered brush hairs 24 radially around the tip portion 22. The handle 20, the tip 22 and the brush bristles 24 are integrally formed of a synthetic resin such as polypropylene (PP).

As shown in FIG. 3, all the bristle hairs 14 have one side 26 (hereinafter referred to as “clockwise”) in the clockwise direction with respect to the circumferential direction of the tip 22 of the handle 20 as seen in the front view of FIG. This side surface 26 is described as the rear side surface), and has a substantially triangular cross section with the two side surfaces 29 other than the rear side surface 26 facing in the counterclockwise direction. An extension surface of the rear side surface 26 of the brush bristles 24 is perpendicular to the surface of the tip portion 22 of the handle 20 and includes the central axis 28 of the tip portion 22. The two side surfaces 29 other than the rear side surface 26 of the brush bristles 24 are provided with a draft angle to facilitate removal of the mold after injection molding. Therefore, as shown in FIG. 3, the brush bristles 24 are tapered as a whole, and the side 30 between the two side surfaces 29 (hereinafter, this side 30 is referred to as the front edge) is closer to the tip side. It will tilt backwards.

[0019] The tip 32 of the bristle 24 is formed round in front view and rear view, and is inclined so that the front edge 30 side is low and the rear side surface 26 side is high.

Furthermore, the pitch of the bristles 24 of each row is changed according to the circumferential position of the tip 22 of the handle 20. For example, in FIG. 2, the pitch a of the bristles 24 in the upper row is made larger than the pitch b of the bristles 24 in the lower row. The pitch of the bristle 24 in the row between them is the force with the upper half pitch a and the lower half pitch b, or between the pitches a and b.

As described above, the brush hair 24 has a triangular cross section, the front edge 30 is inclined toward the rear side surface 26, and the tip portion 32 of the brush hair 24 is also inclined. Is forward If the eyelashes and eyebrows are handled while rotating the mascara brush in such a way, the brush hair 24 will easily pass between the eyelashes and eyebrows and will be easily deformed backwards. can get. In addition, since the pitch of the brush hairs 24 in each row was changed according to the circumferential position of the tip portion 22 of the handle 20, brush hairs having an appropriate pitch can be used according to the situation of eyelashes and eyebrows. It becomes easier to use.

[0022] The inclination directions of the front edge 30 and the tip 32 of the brush bristles 24 are determined to be right-handed.

On the other hand, it is possible to make a left-handed front edge 30 inclined in the direction opposite to that shown in Fig. 1. Because this causes an increase in cost, the mascara brush of the present invention may be dedicated to right-handed use. .

[0023] A method of manufacturing such a mascara brush will be described. As shown in Fig. 4, the mold 38 for injection molding is a force consisting of a total of 10 mold units 42. The pair of mold units 42 constitutes a block 40 connected by bolts 44. is doing. Therefore, each mold unit 42 has a fan-shaped cross section with a central angle of 36 °, and its central part is cut off. When all the mold units 42 are combined, the handle 20 and its tip end are combined in the central part. A cavity 50 for forming the portion 22 is formed.

[0024] It should be noted that the center part 43 at both ends of the mold unit 42 is formed in a circular arc surface, and when the mold unit 42 is combined, a cylindrical center support part 54 is arranged at the center of the center part 43 at both ends. To do. The reason why such a center support portion 54 is used is that it is difficult to manufacture with high accuracy if the center portions 43 of both ends of the mold unit 42 remain sharp. A hole 55 drilled in the tip 22 of the handle 20 is created due to the presence of the central support 54.

One surface 46 of the mold unit 42 is a complete plane, and this plane 46 is a surface that forms the rear side surface 26 of the brush bristles 24. The other surface 48 of each die unit 42 is also a flat surface, and a V-shaped groove 52 having a V-shaped cross section communicating with the void 50 is formed by electric discharge machining. The V-shaped groove 52 forms the front edge 30 of the brush hair 24 and the two surfaces 29 on both sides thereof. The V-shaped groove 52 is made shallower toward the tip side in order to form a draft gradient. The front end portion 56 of the V-shaped groove 52 is also inclined so that the rear side surface 26 side of the bristle 24 is slightly higher than the front edge 30 side. When a mold is made by combining these mold units 42 and a mascara brush is made by injection molding, as shown in Fig. 1, the extended surface of the rear side 26 of the brush hair 24 is the tip of the handle 20. Position including central axis 28 of part 22 It becomes. The extension line of the front edge 30 of the bristle 24 is shifted from the central axis 28 of the tip 22 of the handle 20, and each bristle 24 has the front edge 30 inclined toward the rear side 26.

Thus, in the mold unit 42 constituting the mold of the present embodiment, the side surface 48 on one side 48 is not provided without providing the V-shaped groove 52 for forming the brush bristle 4 on both side surfaces 46, 48. Since the V-shaped groove 52 for forming the bristle 24 is provided only for this, the labor for making the mold is greatly reduced, and the cost can be reduced.

By the way, the present invention is not limited to the above-described embodiments. For example, various modifications can be made as follows. In the above embodiment, 10 rows of brush hairs 24 are provided, but the number of rows of brush hairs 24 may be increased or decreased as appropriate. The cross-sectional shape of the brush bristles 24 is a substantially triangular shape in which the leading edge 30 is appropriately rounded in the above-described embodiment, but may be a perfect triangle with a sharp leading edge 30. The shape of the tip 32 of the brush bristles 24 is a curved surface with an appropriate roundness in the above embodiment, but it may be a completely flat surface. The pitch of the brush bristles 24 in each row may be appropriately changed according to the position in each row that does not need to be constant. The length of the brush bristles 24 in each row may be appropriately changed according to the circumferential position of each row or the position in each row, which need not be constant.

Claims

The scope of the claims

[1] In a cosmetic applicator in which a number of brush bristles with multiple rows of force are formed integrally with the tip of the handle,

Each bristle has a substantially triangular cross-section with the rear side facing one side in the circumferential direction of the tip of the handle and the other side facing the two sides other than the rear side, and the extended surface of the rear side is the handle A cosmetic applicator comprising a central axis of the tip portion and provided with a slope on two side surfaces other than the rear side surface.

[2] The cosmetic applicator according to [1], wherein an inclined surface that increases toward the rear side surface is formed at a tip of the brush hair.

[3] The cosmetic applicator according to claim 1 or 2, wherein the pitch of the bristles in each row is changed according to the position in the circumferential direction.

[4] A cosmetic applicator molding die for forming the cosmetic applicator according to claim 1, 2 or 3, wherein the cosmetic applicator molding die is a combination of fan-shaped mold units. Configured

A mold for forming a cosmetic applicator, wherein each mold unit has a V-shaped groove for forming brush hairs formed on only one of the two side surfaces.