JPH0965933A - Brush manufacturing method - Google Patents

Abstract

(57) 【Abstract】 PROBLEM TO BE SOLVED: To provide a brush of integral molding type, which has high bristle implantation strength, less burr, and good bristling. SOLUTION: The mold 1 is provided with a cylindrical projection 10 ₁ extending in the cavity at the outer peripheral portion of a hair bundle through hole 11 of the hair bundle 1.
0, and a through-hole opening end 1 that opens at the edge of the cylindrical projection
1 ₁ After spaced gap apart slightly the fused mass 2 from flocking strength is held by the molding material and the fused mass 2 and tufts root portion 1 ₁ is filled with a molding material into the cavity 13 High quality brush with less burrs.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a brush, such as a toothbrush or a hair brush, in which a plastic brush portion is integrated when molding a handle portion.

[0002]

2. Description of the Related Art Recently, instead of a brush in which a bunch of hair is fixed to a hair-implanting hole in a handle using a metal piece or a metal wire,
It has been proposed to integrate a brush part made of plastic at the time of molding the handle part. Traditionally, with this kind of brush,
One end of the bristled brush is melted to form a fused mass,
The thickened portion of the bristles thus bundled is introduced into the mold for forming the handle portion, and the plastic material of the handle portion is injected and filled. Then, by hardening the plastic, each hair bundle is integrally fixed in the handle portion. It is known that (Japanese Patent Publication No. 6-1672)
No. 5, gazette and Tokuhyo 2-503150).

[0003]

In the conventional method of forming a fused mass at the end of a hair bundle and then injecting a molding material into a mold to mold a bristle member or a brush, the bristle strength (molding strength) In order to improve the difficulty of pulling out the hair bundle from the body), it is preferable to inject the molding material into the mold with the hair bundle fusion mass inserted deeply into the mold, but the pressure during injection molding There is a drawback that the molding material flows out from the through hole to cause burrs. The burr is a part of the molding material that exudes from the gap between the hair bundle and the through hole, but it increases the density of the hair bundle in the through hole and adjusts the molding conditions such as injection pressure and injection speed. Although it is possible to reduce the incidence and size of burrs to some extent, burrs protruding from the flocked surface impair the appearance of the product, and large burrs have the problem that they may damage the oral cavity. It was Therefore, the fused mass at the protruding end of the hair bundle is made into a fused mass having a cross section larger than the cross section of the through hole, and the through hole is closed by this fused mass when the molding material is injected (Japanese Patent Publication No. 6-1.
6725) is also proposed, but since the fused mass of the hair bundle is near the surface of the head portion, it is not sufficiently satisfactory for the hair transplant strength, and there is a drawback that hair tends to spread outward from the root portion of the hair tuft and hair is poorly raised. there were. In addition, a method of inserting the fused mass of hair bundle deeply into the mold of the head portion to form the bundle (Japanese Patent Laid-Open No. 2-5031)
No. 50) had a drawback that the mold system was complicated.
The present invention is intended to easily eliminate these drawbacks of the related art, and with a simple mold structure, a high hair transplant strength and a good hair transplant condition can be obtained without requiring a special mold system. In addition, it is to obtain a safe molding method in which burrs do not easily come out above the flocked surface.

[0004]

SUMMARY OF THE INVENTION According to the present invention, a hair bundle is introduced into a hair bundle insertion through hole provided in a handle molding die to project one end of the hair bundle, and heat the protruding end portion. A brush in which the bunch is integrally implanted on the handle by forming a fused mass by means, positioning the fused mass in the mold cavity for the handle molding, and then introducing the handle material, and molding the handle material by hardening the handle material. In the method for manufacturing the above, a mold in which a cylindrical projection protruding into the cavity is provided at the outer peripheral portion of the through hole of the hair bundle is used and After arranging with a slight distance and leaving a gap, the molding material is filled in the cavity and the fused mass and the root of the hair bundle are held by the molding material. Good hair that does not appear on the surface It is an brush.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION In this brush manufacturing method, a fused mass at one end of a bristle bundle is projected into an inner space of a mold for molding a handle,
By injecting the molding material into the mold, when molding the flocking member or brush, even if the molding material exudes into the hair bundle, it does not appear on the surface and stays in the annular hole formed by the cylindrical protrusion. By this, it is possible to prevent burrs from being formed on the flocked surface. In addition, since the fused mass can be inserted up to near the central part of the molded body, the fused mass and the root of the hair bundle are held by the molding material, so that the hair transplant strength is high and the hair is raised without requiring a special mold system. It is possible to obtain a good quality brush with a good flocked state and less burr.

[0006]

EXAMPLE An example of the present invention will be described with reference to the example of FIGS. 1 to 3. The hair bundle is inserted by introducing the hair bundle 1 into the hair bundle insertion through hole 11 provided in the handle molding die 10. One end of the hair bundle is aligned with the pin 15 to be protruded, and the protruding end is heated by the heat source 12 _1.
The fused mass 2 is formed by the heating plate 12 or the heating means 12 such as hot air and infrared rays, the fused mass 2 is positioned in the cavity 13 of the handle molding die 10, and the handle molding die 10 is closed. Alternatively, after the fused mass 2 is positioned in the cavity 13 after the mold is closed, the molding material is introduced, and when the molding of the handle is carried out by hardening of the molding material, the brush 4 in which the hair bundle 1 is integrally transplanted on the handle 3 is obtained. , A cylindrical protrusion 1 projecting into the cavity at the outer periphery of the hair bundle through hole 11
The mold 10 having the extension 0 ₁ is used, and the fusion mass 2 is slightly separated from the opening end 11 _{1 of the} through hole opening to the end edge of the cylindrical projection, and a space is provided between the fusion mass 2 and the molding material. some as the fused mass 2 and tufts root portion 1 ₁ and the high burr less quality good brush occurrence of flock strength is held by the molding material is filled.

In this case, the hair bundle insertion pin 15 is slidably inserted into each of the hair bundle through holes 11 provided in the handle forming die 10 and the hair bundles 1 are stopped at a predetermined position and fused. The mass 2 is fixedly arranged in the cavity 13, and it is preferable that the hair bundle insertion pins 15 are simultaneously moved in a lump. Incidentally, the cylindrical projection 10 ₁ of the wall thickness 0.1~1.0mm preferably height 0.2~0.6mm the 0.1~2.0mm preferably 0.2~1.0m
It is about m. Further, the insertion distance of the hair bundle in the cavity 13 can be arbitrarily selected according to the thickness of the base of the flocking member or the thickness of the brush head portion, and the hair bundle root portion 1
_The annular space 3 ₁ formed around ₁ can prevent burrs from protruding from the hair-implanted surface by accommodating the burr generated by the injected resin oozing out from the gap between the bristles and the through holes in the hole.

While the molding material filled in the cavity 13 is soft before it is solidified, the hair bundle 1 is pushed into the through hole 11 by the hair bundle insertion pin 15, and, for example, the hair bundle fusion mass 2 is formed at the center of the molded body. By inserting up to the vicinity of the hair part, it is possible to reliably hold the hair bundle fused mass and the hair bundle root part with the molding material, so that it is possible to obtain sufficient hair transplant strength and to achieve hair transplant with good hair raising. can do.

In the specific example of FIG. 4, the open end 11 ₁ of the hair bundle through-hole 11 is located at the tip of a projection protruding in the cavity 13, and the projection has a conical projection 10 ₂ with a tapered surface. to by conical space 3 ₂ around the tuft base portion 1 ₁ is formed, by paying a burr injected resin is exuded from the gap tuft and the through-holes in the annular hole, flocked It is possible to prevent burrs from the surface, significantly improve the appearance quality, and insert the bundle of hair bundles into the vicinity of the center of the molding, and hold the root of the hair bundle with molding material It is possible to obtain excellent flocking strength and to obtain flocking with good hair raising.

The present invention also includes the following characteristic configurations. By the hair bundle insertion pin in each of the hair bundle through holes,
A brush manufacturing method in which a hair bundle is fixed at a predetermined position to form a gap between the fused mass and the periphery of the root of the hair bundle, and the molding material is filled around the root of the hair bundle. A method for manufacturing a brush, wherein the cylindrical projection is provided with a taper surface which is tapered toward the opening end of the through hole, and is positioned so as to project into the cavity of the mold for mold for handle injection molding.

[0011]

The present invention uses a mold in which a cylindrical projection protruding into the cavity is provided at the outer peripheral portion of the through hole of the hair bundle, and the fusion is performed from the opening end of the through hole opened at the edge of the cylindrical projection. The lumps are placed slightly apart from each other with a gap therebetween, and then the molding material is filled in the cavity so that the fused lump and the root of the hair bundle are held by the molding material. By the cylindrical protrusion, the injected resin can store the burr exuding from the gap between the hair bundle and the through hole in the annular hole formed by the cylindrical protrusion,
It is possible to prevent burrs from the flocked surface, and the hair bundle fused mass can be inserted up to near the central portion of the molded body, and by holding the root of the hair bundle with the molding material, sufficient flocking strength can be obtained. In addition, it is possible to achieve flocking with good fluffing, good quality, high appearance quality and high reliability, and a molding material with a gap between the fused mass and the cylindrical projection open. Since there is no need for a step of pulling up the hair bundle and closing the hair bundle through hole with the fused mass, there is an effect that productivity can be significantly improved.

[Brief description of drawings]

FIG. 1 is a process explanatory view of a manufacturing method according to an embodiment of the present invention, in which (a) is a hair bundle inserting step, (b) is a fused mass forming step, (c) is a step immediately before injection molding, and (d) is a hair bundle pushing step. , (E) shows a mold release process.

2A and 2B are enlarged vertical cross-sectional views of a part of the molding process of the example of FIG. 1, in which FIG.

FIG. 3 is a perspective view of a portion of the product.

FIG. 4 is an enlarged vertical cross-sectional view of a part of the manufacturing process of another embodiment of the present invention, in which (a) shows the state of injection and (b) shows the state after release.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Hair bundle 2 Fusion mass 3 Handle 3 ₁ Cylindrical space 3 ₂ Conical space 4 Brush 10 Handle forming mold 10 ₁ Cylindrical projection 10 ₂ Cylindrical projection 11 Through hole 11 ₁ Open end 12 Heating means 12 ₁ Heat source 13 Cavity 15 Hair bundle insertion pin

Claims (1)

[Claims] 1. A hair bundle is introduced into a through hole for hair bundle insertion provided in a handle molding die to project one end of the hair bundle,
The protruding end is formed into a fused mass by heating means, the fused mass is positioned in the mold cavity for the handle molding, and then the handle material is introduced, and when the handle material is molded by hardening the handle material, the hair is formed on the handle. In a method of manufacturing a brush in which a bundle is integrally planted, a mold having a cylindrical projection protruding into the cavity at the outer peripheral portion of the through hole of the bristle bundle is used, and a through hole opened at the end of the cylindrical projection. A brush manufacturing method characterized in that the fused mass is slightly separated from the opening end and arranged with a gap therebetween, and then the cavity is filled with a molding material to hold the fused mass and the root of the hair bundle with the molding material. Method.