JPH09182629A - Manufacture of brush and its device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve bristle implantation strength, eliminate any possibility of burr, and improve rising performance of the bristles of a brush which are integrally formed with a handle part. SOLUTION: A manufacturing method for a brush is that one end of a synthetic resin bristle bundle 1 is fused as to form a fused lump 2, the fused lump 2 is inserted in and held by a cavity 13 in a handle forming die 10, a forming material is introduced in the cavity 13, and a bristle implanted part 4 is integrally fixed to the handle part 3 by hardening of the forming material. Therefore, the bristle bundle 1 is guided and introduced to a handle forming die 10 provided with a bristle bundle insertion and holding hole 11 which has an outline 112 along the cross-sectional shape of the bundles arranged closely around the outer circumference of the bristle bundle 1, and the respective bristles of the bristle bundle 1 are pushed into the bristle bundle insertion and holding hole 11 by a presser pin 15 with their intervals closely contacted so as to be embedded and fixed in the forming material in the cavity. This constitution can provides the brush whose bristle implanted part and bristle bundle are eliminated from any burr and which has high bristle implanted strength and high quality.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a brush, such as a toothbrush, a hairbrush, a body brush or a cleaning brush, in which a plastic brush portion is integrated at the time of molding a handle portion, and an apparatus therefor.

[0002]

2. Description of the Related Art Recently, a synthetic resin bristle bundle is integrated at the time of molding of the handle portion, instead of a brush whose bristle bundle is fixed to the hair-implanting hole in the handle portion with a metal piece or a metal wire. Is proposed. Conventionally, in this type of brush, the bundle of bristles that have been bundled is melted to form an enlarged portion, and the enlarged portion is put into a mold for forming a handle portion and injection-filled with a plastic material for the handle portion to make a plastic. It is known that the respective hair bundles are integrally fixed in the handle portion by curing (No. 6-16725, No. 2-503150).

[0003]

SUMMARY OF THE INVENTION In the conventional method for flocking a bristle member or brush by fusing the ends of a hair bundle, and then injecting a synthetic resin molding material into a mold, In order to increase the strength (difficulty of pulling out the hair bundle from the molded body), it is preferable to inject the molding material into the mold with the end of the hair bundle being deeply inserted into the mold. The molding material flows out from the through hole due to the pressure at the time and burrs are generated.For example, a bundle of fusing or non-fusing one end is inserted into the mold and the synthetic resin material is injected to the handle part and the bristles. When the hair bundle B is inserted into the hair bundle insertion through hole A as shown in FIG. 7A when the bundle is integrated, a gap C is formed on the outer periphery, and the resin injected into the gap C for forming the handle is formed. Is raised by the pressure of injection (injection), etc. Enters, protrusion of the resin, so-called burrs D was sometimes occur. [FIG. 7 (b)] This burr is a part of the molding material exuding from the gap between the hair bundle and the through hole. However, the burr increases the density of the hair bundle in the through hole, the injection pressure and the injection pressure. By adjusting the molding conditions such as speed, it is possible to reduce the occurrence rate and size of burrs to some extent, but burrs protruding from the flocked surface are
There is a problem that the appearance of the product is impaired and a large burr may damage the oral cavity, and the flocked surface is liable to become dirty and unclean. Therefore, in order to prevent burrs from occurring, 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 ( Tokuhei 6-16
No. 725) has also been proposed, but since the fused mass of the hair bundle is near the surface of the head portion, the depth of the hair transplant becomes shallow, and the holding power of the hair bundle for brush, so-called hair transplant strength is not sufficiently satisfied. There was a defect that the hair bundle was likely to spread outward from the root portion of the transplanted hair and had poor hairiness. In addition, a method of inserting the fused mass of hair bundle deeply into the mold of the head part and molding it (see Table 2-50).
No. 3150) has a drawback that the mold system is complicated and the manufacturing cost is increased because it is necessary to prevent the resin from entering around the hair bundle. The present invention is intended to easily eliminate these drawbacks of the related art, and has a simple mold structure, which does not require a special mold system and has a high flocking strength and a flocked state with good flocking. In addition, it is to obtain a method for manufacturing a brush in which burrs do not protrude above the flocked surface, and an effective manufacturing apparatus therefor.

[0004]

SUMMARY OF THE INVENTION According to the present invention, one end of a synthetic resin hair bundle is fused and inserted into and held in a cavity in a handle molding die, and a molding material is introduced into the cavity for molding. In the method for manufacturing a brush having a hair-implanted portion integrally fixed to a handle portion by curing a material, a hair-bundle insertion holding hole having an outer contour along a bristle cross-sectional shape arranged without gaps on the outer periphery of the hair bundle is provided. In the handle molding die provided, the hair bundle insertion holding hole is pressed by the insertion mechanism between the respective hairs of the hair bundle in close contact with each other, and the hair is embedded and fixed in the molding material in the cavity to form the hair transplant portion. is there.

Further, according to the present invention, a brush manufacturing method in which a hair bundle insertion holding hole is formed in a communicating state in a cavity provided in a handle molding die, and a hair bundle insertion mechanism is provided in the hair bundle insertion holding hole. In the device, the outer peripheral shape of the hair bundle insertion and holding hole is an outer contour along a hair bristle cross-sectional shape that is arranged on the outer periphery of the hair bristle without a gap, and the hair bundle is pushed into the outer contour for insertion. It is characterized by having an insertion mechanism.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION In the embodiment of the present invention, one end of a hair bundle made of thermoplastic synthetic resin is inserted and held in a cavity in a mold for molding a handle, and a molding material is introduced into the cavity, In a method of manufacturing a brush having a hair-implanted portion integrally fixed to a handle portion by curing a molding material, a hair bundle insertion holding hole having an outer contour along a hair bristle cross-sectional shape that is arranged on the outer periphery of the hair bundle without a gap. In the handle forming die provided with the above-mentioned bristle bundle insertion holding hole, each bristle bundle of each bristle bundle is inserted by an insertion mechanism such as an extrusion pin having an outer peripheral contour of the same cross-sectional shape and circular cross-sectional shape of the same diameter. By pressing in close contact and embedding and fixing it in the molding material in the cavity to form the flocked part, the bristles arranged on the outer periphery of the bristles are held in close contact with each other and no gap is generated between the bristles. No burrs are generated and it is planted on the handle. Moreover, it is possible to obtain sufficient hair transplantation strength without rotating or inclining each hair bundle due to the injection pressure of the molding material, improving the hair raising, good scraping property, and design. By providing a design allowance, a brush with high hair transplant strength, good hair transfer can be obtained, and a brush with good appearance quality can be obtained without requiring a special mold system.

[0007]

EXAMPLE An example of the present invention will be described with reference to the examples of FIGS. 1 to 5. One end portion of a synthetic resin hair bundle 1 is fused and a fused mass 2 is formed.
The fused mass 2 is inserted into and held in the cavity 13 in the handle molding die 10, the molding material is introduced into the cavity 13, and the flocked portion 4 integrally fixed to the handle portion 3 by hardening the molding material. A method for manufacturing a brush according to claim 1, wherein the hair bundle insertion holding hole 11 has an outer contour 11 ₂ along the bristle cross-sectional shape that is arranged on the outer periphery of the hair bundle 1 without a gap.
The hair tuft 1 is guided and inserted into the handle forming die 10 provided with a push pin 15 having an outer peripheral contour 15 ₁ having the same cross-sectional shape as the hair tuft insertion holding hole 11, or a circular cross-section having the same diameter. With the insertion mechanism such as the extruding pin, the bristle tufts 1 of the bristle tuft 1 are pressed in close contact with each other and embedded and fixed in the molding material in the cavity to form the tufted portion 4.

Further, in the present invention, as a device used in this brush manufacturing method, the hair bundle insertion holding hole 11 for communicating with the cavity 13 provided in the handle molding die 10 is provided.
And a hair bundle push-out pin 15 for inserting the hair bundle 1 into the hair bundle insertion holding hole 11 in a slidable manner, the outer peripheral shape of the hair bundle insertion holding hole 11. Is an outer contour 11 ₂ along the hair bristle cross-sectional shape which is arranged on the outer circumference of the hair bristle 1 without any gap, and the hair bristle push-out pin 15 is formed on the outer contour 15 ₁ having the same cross-sectional shape as the outer contour 11 ₂ . Alternatively, the brush manufacturing apparatus is provided with an insertion mechanism such as an extrusion pin having a circular cross section with the same diameter.

In this case, the bristle bundle 1 is introduced into the bristle bundle insertion holding hole 11 provided in the handle molding die 10 and one end of the bristle bundle is aligned with the bristle bundle pushing pin 15 so as to be projected. The fused end 2 having a cross section larger than the cross section of the hair bundle insertion holding hole 11 is formed by heating the protruding end with a heating plate 12 using a heat source 12 ₁ or heating means 12 such as hot air or infrared rays.
Is placed in the cavity 13 of the handle forming mold 10 to close the handle forming mold 10, or after the mold is closed, the fused mass 2 is placed in the cavity 13 and a molding material is introduced. By forming the brush 4 in which the bristles 1 for hair are integrally transplanted to the handle portion 3 by handle molding by curing the molding material, the brush has high hair transplant strength and good quality.

A push pin 15 is slidably inserted into each of the hair bundle insertion holding holes 11 provided in the handle forming mold 10 to push in each hair bundle 1. It is preferable to simultaneously move the push-out pins 15 of each hair bundle 1 at once. In addition, the insertion distance of the hair bundle 1 is
It can be arbitrarily selected according to the thickness of the base of the flocking member or the thickness of the brush head part, and the bristles do not spread from the root of the flocked part to the outside and stand straight and have good bristling. Considered to keep.

Particularly, since the outer shape of the hair bundle and the inner shape of the hair bundle insertion holding hole are substantially the same and there is no gap between them, burrs due to outflow of the molding resin into the holding hole during injection molding are prevented. In addition, it is not necessary to close the gap between the hair bundle and the hair bundle holding hole at the hair bundle thickening part, and it is possible to form a flat hair-implanted surface as in the past and maintain any hair implantation depth. As a result, sufficient bristle transplanting strength can be obtained, and since the tufts for hair are guided and inserted into the inner shape of the holding holes, twisting of tufts can also be prevented, and fluffing is greatly improved.

Further, as the hair bundle insertion holding hole 11 formed in the handle molding die 10, a tapered taper hole 14 is formed at the open end of the hair bundle introducing side, so that the hair bundle can be externally used. The hairs arranged without gaps are the hair bundle insertion holding holes 11
It is effective to guide the hair tufts 1 so as to be smoothly inserted by being guided along the outer contour 11 ₂ .

A large number of holding holes 11 for holding the hair bundle 1.
In a method of manufacturing a brush molded by a mold having a mold, the cross-sectional shape of the holding hole 11 and the cross-sectional shape of the bristle bundle 1 are matched, and various cross-sectional shapes of the bristle forming the bristle bundle are used. Since the holding hole has a cross-sectional shape that matches the bristle bundle cross-sectional shape constituted by them, the gap into which the molten synthetic resin enters can be reduced. For example, as shown in FIGS. The cross-sectional shape of the bristle is not limited to a circular shape, but may be an oval-shaped bristle (FIG. 5 (a)), a hexagonal bristle (FIG. 6 (a)), or a quadrangular bristle (FIG. 7 (a)). wavy outer contour 11 ₂ as in the example of the use of a hair triangular cross section [FIG. 8 (a)], jagged, and the like uneven, often cause act by fitted the extrusion pin 15, the occurrence of burrs You can surely prevent it, and you can get a beautiful appearance. It is possible to obtain a brush without oral damage when using Te.

The insertion mechanism 15 is not limited to the one in which the hair bundle is inserted by the extruding pin 15, but another method, for example, after forming a fused mass or a fusion plate at the end of the hair bundle. A step of in-molding the fused mass or the fused plate in the cavity, pulling out the hair bundle to a predetermined length at the same time as releasing the handle, and then cutting the pulled-out hair bundle at a position away from the molding die. By adopting, it is possible to easily perform the heat-molding of the next fused mass at the end of the hair bundle or the fused plate, and it is possible to improve the productivity by repeating the subsequent steps.

In this embodiment, at the time of in-molding, that is,
When the molding material is injected into the handle molding die 10, since the lower part of the hair bundle is integrally held, the hair bundles can be maintained in a substantially right angle direction without falling or tilting due to the injection pressure, and the hair transplant strength is also high. 2.7 kg / single bundle (single bundle 10
It is possible to increase the strength by about 3 times that of 8.5 kg / 1 bundle with respect to the average value of the bundle). In this case, the hair bundle 1
After heating all the projecting end portions of each of the fused lumps 2 to fuse them to the fused lumps 2, each fused lump 2 is pressed against a forming plate (not shown) and shaped into a substantially hemispherical shape or a conical shape or a flat shape, and then contacted. Alternatively, the fusion piece may be integrally connected so that the sides are connected to each other, and the fusion piece may be embedded in the handle head portion 3. In addition,
In order to connect and integrate each hair bundle, after forming the fused mass 2,
The molding plate may be pressed to form the fused piece, but it is also possible to use a heater provided with a molding die portion to form the fused piece while fusing.

The features of the present invention include the following manufacturing method and manufacturing apparatus. A fused mass having a cross section larger than the cross section of the hair bundle insertion holding hole by introducing the hair bundle into the hair bundle insertion holding hole communicating with the cavity in the handle molding die to project the hair bundle end And a method for manufacturing a brush in which the fused mass is separated from the inner surface of the cavity mold and in-molded inside the cavity. A hair taper introduction side opening end of the hair tuft insertion holding hole formed in the handle molding die is provided with a tapered hole,
An apparatus for manufacturing a brush that communicates with the outer contour of a hair bundle insertion and holding hole that is arranged on the outer periphery of the hair bundle with no space. The cross section of the bristle used for the bristle bundle is circular, elliptical, triangular, quadrangular or polygonal, and the bristle bundle insertion holding hole having an outer contour in which each bristle is arranged on the outer periphery without a gap is formed by a handle. Brush manufacturing equipment for molds.

[0017]

According to the present invention, one end of a synthetic resin hair bundle is fused and inserted into and held in a cavity in a handle molding die, and the molding material is introduced into the cavity, and the molding material is cured. In a method of manufacturing a brush having a hair-implanted portion integrally fixed to a handle portion, handle molding including a hair-bundle insertion holding hole having an outer contour along a bristle cross-sectional shape arranged without gaps on the outer periphery of the hair bundle. The outer periphery of the hair bundle is fixed by pressing the hair bundle insertion holding hole into the die with an insertion mechanism so that the hair bundles of the hair bundle are in close contact with each other and being embedded and fixed in the molding material in the cavity to form a hair transplant portion. Since the shape and the inner shape of the hair bundle holding hole are almost the same and there is no gap between them, it is possible to prevent burrs due to the flow of molding resin into the holding hole during injection molding, and at the enlarged hair bundle for hair. It is necessary to close the gap between the hair bundle and the hair bundle holding hole. Since it is possible to form a flat flocked surface as in the past and to hold an arbitrary flocked depth, sufficient flocking strength is obtained and the tufts for hair are guided by the inner shape of the holding holes and inserted. Therefore, the twist of the hair bundle can be prevented, and the hairiness is greatly improved.

Further, the hair bundles can be planted without being rotated or tilted due to the injection pressure of the molding material, and a sufficient planting strength can be obtained. By having a design margin, it is possible to obtain a brush with a high appearance quality and a high bristle strength and a bristle-implanted hair condition without the need for a special mold system. Further, in the present invention, the outer peripheral shape of the hair bundle insertion holding hole is an outer contour along the hair bristle cross-sectional shape arranged on the outer periphery of the hair bristle without a gap, and the hair bundle is inserted along the outer contour. Since the hair bundle insertion mechanism for holding the hair bundle is held with no gaps on the outer periphery of the hair bundle and the adhesion between the outer periphery of the hair bundle and the holding hole is improved, the injected molten synthetic resin is used. It is possible to prevent burrs from entering between the outer circumference of the hair bundle and the holding hole, improve bristling strength, and improve fluffing, and insert the end of the hair bundle up to near the center of the molded product. Since the fused hair lump and the root of the hair bundle can be reliably held by the molding material, sufficient hair transplant strength can be obtained, and the hair can be satisfactorily transplanted with good quality and appearance quality. Can be highly reliable.

[Brief description of the drawings]

FIG. 1 shows one step of an embodiment of the present invention, (a) is an enlarged vertical sectional view, (b) is an enlarged sectional plan view taken along line XX,
(C) is an enlarged cut-away plan view of the state in which the hair bundle is removed in the example of (b).

2A and 2B show the separated state of the example of FIG. 1, where FIG. 2A is a partial vertical cross-sectional view, and FIG. 2B is an enlarged sectional plan view taken along line YY.

3A to 3C are explanatory views of a manufacturing process 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 inserting step. , (E) shows a mold release process.

FIG. 4 is a perspective view of a part of the molded product.

FIG. 5 is an example of a hair bundle with an elliptical cross section used in the present invention, (a) is an enlarged cut plan view of the hair bundle, and (b) is an enlarged cut plan view of the hair bundle insertion holding hole. is there.

FIG. 6 is an example of a bristle for polygonal section used in the present invention,
(A) is an enlarged cutting plan view of a hair bundle, and (b) is an enlarged cutting plan view of the hair bundle insertion holding hole.

FIG. 7 is an example of a bristle for a square section used in the present invention,
(A) is an enlarged cutting plan view of a hair bundle, and (b) is an enlarged cutting plan view of the hair bundle insertion holding hole.

FIG. 8 is an example of bristle for triangular section used in the present invention,
(A) is an enlarged cutting plan view of a hair bundle, and (b) is an enlarged cutting plan view of the hair bundle insertion holding hole.

9A and 9B are enlarged cutaway plan views in which the hair bundle is inserted into a through hole in a state in which the hair bundle of the conventional example is used, and FIG. 9B is an enlarged perspective view of the hair bundle.

[Explanation of symbols]

1 hair bundle 2 fused mass 3 handle portion 4 hair transplanting portion 10 handle forming die 11 hair bundle insertion holding hole 11 ₁ hole opening end 11 ₂ hair bundle outer contour 12 heating means 12 ₁ heat source 13 cavity 14 taper hole 15 Extrusion pin 15 ₁ Perimeter outline

Claims (2)

[Claims] 1. An end portion of a synthetic resin hair bundle is fused and inserted and held in a cavity in a handle molding die, a molding material is introduced into the cavity, and the molding material is cured to be integrated with the handle portion. In a method for manufacturing a brush having a fixed hair-implanted portion, a handle forming die having a hair-bundle insertion holding hole having an outer contour along a bristle cross-sectional shape arranged without gaps on the outer periphery of the bristle bundle. A method for manufacturing a brush, wherein the hair bristles are inserted into the hair bristles insertion holding hole by an insertion mechanism so as to press the bristles between the bristles closely, and the hair is embedded and fixed in the molding material in the cavity to form a flocked portion. 2. A brush manufacturing apparatus in which a hair bundle insertion and holding hole is formed in communication with a cavity provided in a handle molding die, and a hair bundle insertion mechanism is provided in the hair bundle insertion and holding hole. The hair bundle insertion and holding hole has an outer peripheral shape along the hair bristle cross-sectional shape that is arranged on the outer periphery of the hair bristle with no gaps, and is provided with a hair bundle inserting mechanism for pushing and inserting the hair bristle bundle into the outer contour. A brush manufacturing device characterized by the above.