JP2007006951A - Cosmetic applicator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cosmetic applicator capable of evenly dispersively spreading bristles whose cross-section is circular, and being inexpensively manufactured. <P>SOLUTION: The cosmetic applicator, a mascara brush 10, has bristles 14 made of non-stretching or low-stretching fiber whose stretching rate is not more than 20%. Most synthetic fiber, such as PA612, PA66, PA6, PBT, PP, PET, and PVC, can be used as the material of the fiber. The diameter of the fiber is about 0.05-0.25 mm. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a cosmetic applicator such as a mascara brush.

  As shown in FIG. 2, the conventional mascara brush 10 has the application part 14a by which many brush hairs 14 were planted in the front-end | tip part of the pattern comprised by twisting a pair of core wire material 12. As shown in FIG. . In order to implant such a bristle 14 at the tip of the core wire 12, the following is performed (see Patent Document 1 below). As shown in FIG. 3, the center portion of the bristle 14 is sandwiched between the pair of core wires 12 and the pair of core wires 12 is twisted. Thus, the brush hand 14 is firmly fixed to the tip of the core wire 12 as the core wire 12 is twisted. Then, if the application part 14a is processed into a desired shape, the mascara brush 10 is completed.

  The brush bristles 14 are mainly synthetic fibers such as PA (polyamide or nylon) 612 having a solid circular cross-sectional thickness of 2.5 to 6 denier, a smooth surface, and relatively soft (hereinafter simply referred to as fibers). Is used).

  In order to produce this fiber, first, using a special spinning machine, the resin material is put into a hopper and then passed through a thermal cylinder with a screw to be thermoplasticized. The plasticized resin is crumbly gelled and extruded from the pores (die) provided at the tip of the cylinder. At this stage, the extruded resin becomes a string, which is then passed through a cooling water bath. Then, while reheating the filamentous resin in a heating furnace, through a stretching process of stretching while stretching to about 250 to 350% in the case of PA612, and about 600% in the case of PP (polypropylene), They are finished as yarn and wound around packing rolls for commercialization.

This stretching process is an essential process for extending the resin molecules in a certain direction to give strength and rigidity peculiar to the resin and to stabilize the physical properties in terms of quality. At present, only the product that has undergone a drawing process is used as the material of the brush bristles 14.
Japanese Patent Publication No. 6-91851

  The bristles 14 of the mascara brush 10 use fibers that have undergone the drawing process as described above. However, since these fibers have high rigidity, a pair of the bristles 14 are sandwiched between the pair of core wires 12. When the mascara brush 10 is manufactured by twisting the core wire material 12, the brush hairs 14 tend to concentrate along the spiral surface as shown in FIG. 4. When the brush hairs 14 are concentrated along the spiral surface, there is a problem that the cosmetic retainability and applicability deteriorate. For this reason, the bristle 14 is desired to have a tip that is spread as uniformly as possible.

  For this reason, conventionally, a fiber having a cross-shaped cross section as shown in FIG. In addition to this, fibers having an irregular cross section other than a circular cross section such as a hollow cross section or a star cross section have been used as the material of the brush hairs 14. Since the bristle 14 made of such a modified cross-section fiber has low rigidity, when the core wire 12 is twisted between the pair of core wires 12, the root portion is compressed in the cross-sectional direction, and accordingly The tip has the property of spreading uniformly and spreading. Thus, by obtaining the mascara brush 10 of the bristle 14 in which the tip portion is uniformly dispersed and spread, conventionally, the retention and application properties of the cosmetic have been improved.

  In addition, a fiber made of an alloyed resin obtained by blending PA612 and PA6 may be made of a material having a dent on the surface so that the root portion can be easily compressed in the cross-sectional direction as a material for the brush hair 14. It was broken.

  However, fibers having irregular cross-sections and fibers with dents added to the fiber surface of the alloyed resin have a problem that they are difficult to manufacture and expensive.

  Therefore, the present invention has been made in view of the above problems, and an object of the present invention is to provide a cosmetic applicator that can be dispersed and spread uniformly in a circular cross-section and can be manufactured at low cost.

  In order to solve the above problems, the cosmetic applicator according to the first aspect of the present invention has brush bristles made of unstretched or low-stretched fibers having an elongation rate of 200% or less.

  A cosmetic applicator according to a second aspect of the present invention is the cosmetic applicator according to the first aspect, wherein the material of the fiber is PA612, PA66, PA6, PBT, PP, PET or PVC, and the diameter is 0. 0.05 to 0.25 mm.

  According to the first aspect of the present invention, since the non-stretched or low-stretched fiber having an elongation rate of 200% or less is used for the brush hair of the cosmetic applicator, the base of the bristle crosses because the rigidity of the brush hair is low. As the brush shrinks in the surface direction, the bristles bend, and the tips of the bristles are spread regularly and uniformly. As a result, a cosmetic applicator having good cosmetic retention and applicability can be obtained. In addition, since the fibers of the bristle material may have a circular cross section and a smooth surface, the fibers are easy to manufacture, and no new processing steps are added, so that the manufacturing cost is not increased.

  According to the invention of claim 2, since the material of the fiber is PA612, PA66, PA6, PBT, PP, PET or PVC and the diameter thereof is 0.05 to 0.25 mm, the tip of the brush hair is particularly Spread regularly and uniformly. As a result, a cosmetic applicator can be obtained with better cosmetic retention and applicability.

  Hereinafter, a preferred embodiment of the mascara brush which is the cosmetic applicator of the present invention will be described in detail with reference to FIG.

  In this mascara brush 10, as a material of the brush hair 14, a fiber not subjected to a drawing process, which is conventionally essential for the production of synthetic fibers, that is, a plasticized resin is extruded from circular pores and passed through a cooling water tank. Use the fibers at the stage where they are allowed to stand. This fiber is made of PA612, has a solid circular cross section with a diameter of about 0.05 to 0.25 mm, and has a smooth surface. Of course, the cross-section of the brush hair 14 may be a triangle or a rectangle.

  In order to manufacture this mascara brush 10, as in the conventional case shown in FIG. 3, the above-mentioned fibers are cut into a length of 12 to 20 mm as brush hairs 14, and this is cut between a pair of metal core wires 12. The core wire material 12 is twisted and the bristle hair 14 is fixed to the core wire material 12 to make a prototype of the mascara brush 10. Thereafter, as shown in FIG. 1, the application portion 14a of the mascara brush 10 is processed into a predetermined shape to obtain a product.

  According to the present embodiment, the bristle 14 made of fibers that have not undergone the drawing process has low rigidity when twisted between the pair of core wires 12, so that the root portion shrinks in the cross-sectional direction, and the brush is accordingly increased. The bristles 14 are bent, and as shown in FIG. 1, the tips of the bristles 14 are spread regularly and uniformly. As a result, the mascara brush 10 having good cosmetic retainability and applicability is obtained. Moreover, the fibers of the material of the bristle 14 are easy to manufacture because the surface thereof may be smooth with a circular cross section, and the manufacturing cost is increased because only the drawing process performed during the conventional manufacturing is excluded. I will not let you.

  By the way, the present invention is not limited to the above-described embodiments, and various modifications are possible. For example, the material of the brush bristles 14 is not only PA (polyamide or nylon) 612 of the above embodiment, but also PA66, PA6, PBT (polybutylene terephthalate), PET (polyethylene terephthalate), PP (polypropylene), PVC (polyethylene). Most synthetic fibers such as vinyl chloride) can be used. In fact, in addition to PA612, it has been confirmed by experiments that the tip of the brush bristles 14 is regularly and uniformly dispersed in PA6 as well as PA612. In particular, even with a highly rigid PBT, it has been confirmed by experiments that the tips of the bristles 14 are regularly and uniformly dispersed and spread in the same manner as PA612, and it is considered that most synthetic fibers can be used.

  Moreover, in the said Example, although the unstretched fiber was used for the material of the bristle 14, it is also possible to use the low-stretched fiber whose elongation rate is 200% or less by making the stretching process smaller than the conventional one. It is. Actually, it has been confirmed by experiments that the ends of the brush bristles 14 are sufficiently evenly distributed evenly even with PA612 of 15%, 30% and 100% elongation. And even with PA612 having an elongation rate of 200%, it has been confirmed by experiments that the tips of the brush hairs 14 are uniformly dispersed and spread to a usable level. That is, the material of the bristle is not particularly limited as long as the root portion is easily contracted in the cross-sectional direction when twisted between the core wires 12.

  Furthermore, in the said Example, although the bristle 14 was fixed between the core wire materials 12, the brush hair 14 was pinched | interposed between the core wire materials 12, and the core wire material 12 was twisted, It may be firmly clamped so that the base part of the bristles 14 can be contracted in the cross-sectional direction.

  In addition, in the said Example, although this invention was applied to the mascara brush, this invention is widely applicable to the cosmetic applicator which uses a brush besides a mascara.

It is a figure which shows the application part of the mascara brush which concerns on one Example of this invention. It is a figure which shows the whole conventional mascara brush. It is a figure explaining the planting method of the bristles of the mascara brush which concerns on the past and this invention. It is a figure which shows the application part of the conventional mascara brush. It is a figure which shows the cross-sectional shape of the improved bristle fiber of the conventional mascara brush.

Explanation of symbols

10 Mascara brush 12 Core wire 14 Brush hair 14a Application part

Claims (2)

  A cosmetic applicator having brush bristles made of non-stretched or low-stretched fibers having an elongation rate of 200% or less.   The cosmetic applicator according to claim 1, wherein the fibers are made of PA612, PA66, PA6, PBT, PP, PET, or PVC and have a diameter of 0.05 to 0.25 mm.

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