JPH1052323A - Manufacture of brush - Google Patents

Abstract

PROBLEM TO BE SOLVED: To manufacture a brush with its handle integrally bristled, which is ideal for mass production of brushes and each bristle bundle is introduced into a handle injection molding cast through a simple means in order to manufacture high quality brushes. SOLUTION: Bristle bundles 1 are taken out from a plurality of reels 4 around which bristle bundles 1 are wound, the bristle bundles 1 are introduced in advance into a part of a plate or a molding die 10 having bristle bundle holding holes 11, the number of which is same with that of the bristle bundle holding holes 11 of the molding die 10, and which are arranged in the same may as the latter, through a bristle bundle supply device 5, that is cut into section each having a predetermined length by a cutting device including a cuter 6, and the part of the plate or the cast filled with bristle bundles 1 is incorporated into a injection molding device 9 to be injection molded. In this way, bristle bundle insertion molding is surely carried out and mass production of brushes is enabled with a simple cast structure and without any special cast system to obtain brushes having high quality and good appearance.

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, a hairbrush, a body brush or a cleaning brush, and more particularly to a method for forming and integrating a hair bundle and a handle.

[0002]

2. Description of the Related Art Recently, in a toothbrush or the like, instead of a brush in which a hair bundle is fixed to a hair implantation hole in a handle using a metal wire, it is necessary to increase the hair implantation density or to increase the use of the hair implantation shape. It has been proposed that a handle is formed integrally with a hair bundle when a handle is formed of a synthetic resin without using a metal wire. Conventionally, as a method not using a metal wire of this type, a method of introducing a hair bundle into a mold, injecting a handle resin material, and integrally molding (insert molding) (for example, Japanese Patent Publication No. 29-1335, and Kosho 43-597
9, JP-A-3-215211, JP-A-5-1153
No. 25, JP-A-7-265131, etc.).

[0003]

Problems with the conventional manufacturing method include, for example, Japanese Patent Publication No. 29-1335,
The hair bundle is introduced into the mold directly using the hair for the spool in a long state, and cut into a predetermined length after injection molding. The hair bundle is introduced directly into the mold in the long state. In order to do this, it is conceivable to prepare spool hair for each hair bundle holding hole of each cavity or to branch from one or a small number of spools to each holding hole of each cavity and introduce it. When there are a plurality of mold cavities, an enormous number of spools is required, which causes a problem that a large and complicated hair bundle supply device and ancillary equipment are required. In this case, it is extremely difficult to branch and introduce a predetermined number of hair bundles into each hole from a spool in which a number of hair bundles are bundled and wound into each hole without twisting or entanglement. In this case, the distance from the entrance of the hair bundle holding hole of the mold to the position of the spool needs to be considerably large, which causes a problem that the incidental equipment becomes large. Further, there is a problem that the production efficiency is reduced because the ends of the hair bundle are melted after the hair bundle is introduced into the mold. 43-5
No. 979 is a method in which a hair box is provided in a mold, cut hair is packed in the box, and the hair is introduced into each hair bundle holding hole leading to the mold cavity using a pin. However, the hair bundle supply method of such a mechanism may actually cause a problem that the hair in the hair box is bent because the hair cannot be pushed well into the holding hole when the hair bundle is pushed out. ,
In addition, the same trouble occurs continuously when bent hair occurs once. Further, it is extremely difficult and impractical to hold the hairs filled in the hair box in the same direction (each hair in parallel). Japanese Unexamined Patent Publication No. Hei 3-215211 also discloses a method in which cut hair is transported to each hole by air. However, when the number of mold cavities is large, a pipe (pipe) for guiding the hair bundle to the mold ) Is considerably complicated, and it is difficult to keep the number of hairs in one hair bundle constant. There is a problem in that the ratio of the cross-sectional area of the hair bundle (hair filling rate) is not stable, and the possibility of occurrence of burrs that the injection molding resin enters between the hair bundle and the holding hole of the mold increases. On the other hand,
A method of simultaneously extracting a predetermined number of spools from a plurality of spools, such as 115325, requires a large number of spools in the case of a mold having a large number of cavities at the time of mass production. Supplying using hair requires large equipment and auxiliary equipment, and requires a large amount of labor every time the spool is replaced.In addition, when the amount of hair used on each spool varies, the spool is switched. Each time the molding device stops, the production efficiency deteriorates. In addition, there is a drawback that wasteful (remaining) hair is increased. In this regard, Japanese Patent Application Laid-Open No. 7-265131
No. method has the same disadvantage. SUMMARY OF THE INVENTION The present invention is intended to easily eliminate these conventional drawbacks, and to ensure insert molding of a hair bundle with a simple mold structure, which is suitable for mass production without requiring a special mold system. An object of the present invention is to provide a brush manufacturing method.

[0004]

According to the present invention, a hair bundle made of a thermoplastic synthetic resin is introduced into a plurality of hair bundle insertion holes provided in a handle molding die or plate. One end of the bundle is projected, and the projected end is formed into a fusion mass having a cross section larger than the cross section of the holding hole by the heating means,
In a method of manufacturing a brush in which a hair bundle is integrally planted on a handle by introducing the thermoplastic synthetic resin molding material after positioning the fused mass in a cavity of a handle molding die, the hair bundle is wound. The bundle of hairs is unloaded from the plurality of reels that have been turned, and the bundle of hairs is supplied to the plate or the mold having the same number of bundles of hair holding holes in the same arrangement as the bundles of hairs of the molding die. The hair bristle is introduced into the part in advance and cut into a predetermined length by a cutting device, and a part of a plate or a mold filled with the hair bristle is incorporated into an injection molding apparatus and injection-molded. It is intended to provide a brush with high strength and good appearance.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In this method of manufacturing a brush, a bristle bundle made of a thermoplastic synthetic resin is introduced into a plurality of bristle bundle holding holes provided in a handle forming die or plate. The material is injected, and an arbitrary number of reel-like or hank-like bristle bundles are drawn into the injection molding device to form a brush in which the bristle bundle is integrally implanted in the handle by molding the handle by curing the molding material. In the previous stage, a hair bundle is previously introduced into a part of a plate or a mold having the same arrangement and the same number of hair bundle holding holes as the hair bundle holding holes of the mold outside the mold, that is, 1 cavity (for one brush head)
-The amount of hair is divided into at least two or more times by the number of bristle feeders capable of supplying the number of bristle bundles smaller than that of all cavities, and the bristle bundles of all cavities are sequentially filled. These are a hair bundle supplying step for supplying the hair bundle to the hair bundle holding hole outside the injection mold using the time during which the injection molding of the previous shot is being performed, and a hair bundle for a predetermined length. A hair cutting step for cutting the hair bundle, and a melting step for forming an enlarged portion by melting the ends of the hair bundle, and also for improving the filling rate of the hair bundle and the hair bundle holding hole as necessary. By performing the hair bundle squeezing step, it is possible to efficiently produce a high-quality brush with little variation and to simplify the manufacturing equipment.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. 1 to 4. The hair bundle 1 is inserted into a plurality of hair bundle insertion holes 11 provided in a part of a handle forming die 10. FIG. introduced to protrude by aligning one end of the use bristle bundle receiving plate 14, protruding end portion hot plate or hot air by the heat source 12 _1, a heating means 12 such as an infrared, has a larger cross-section than the cross section of the retaining hole 11 The fusion lump 2 is fused to the fusion lump 2, and the fusion lump 2 is positioned in the cavity 13 of the handle molding die 10 so that the cavity 13
After the mold is closed, a molten molding material is introduced, and when the handle 4 is formed by curing the molding material to form the brush 4 in which the bristle bundle 1 is integrally implanted in the handle 3, the handle molding die 10 is used. The hair bundle 1 in the cavity 13
Is positioned, and the handle molding dies 10, 1 are positioned.
0 is closed, and then the fusion mass 2 is injected into the cavity 13 by injection molding at a temperature lower than the softening point of the resin material of the bristle bundle. the fused mass 2 and tufts root portion 1 ₁ is embedded in molding material of the inner held in the molding material is as small quality good brushes high flocked strength variations.

In this case, the hair bundle 1 is carried out from the plurality of reels 4 around which the hair bundle 1 is wound, and the same as the hair bundle holding hole 11 of the molding die 10 by the hair bundle supply device 5. A hair bundle was previously introduced into a part of a plate or a mold having the same number of hair bundle holding holes in the arrangement, cut into a predetermined length by a cutting device including a cutter 6, and the hair bundle 1 was filled. A part of the plate or the mold is drawn into the injection molding device 9 to perform injection molding. Incidentally, the tufts use of the brush is supplied to use bristle bundle clamp portions 8 ₁ of use tuft feeder 5 from the reel 4 in the previous stage of the injection molding, molded by該用tufts clamp portions 8 ₁ Fill the hair bundle holding hole 11 of the mold 10 with the cutter 6
To a predetermined length, and the hair bundle holding hole 11
Feeding part 7 including a piston on one end face
And may be melted by a heating device 12, such as a heating plate or a hot air device, such that all the bristle ends are joined together.

[0008] The hair bundle 1 is connected to the hair bundle clamps 8, 8 _1.
In order to fill the bristle bundle holding hole 11 with a pair of bristle bundle clamps provided opposite the bristle bundle holding hole 11 in a part of the mold outer plate or the molding die 10 as shown in FIG. Part 8,
8 ₁ , each of which is provided with a bristle tightening gripper plate 18, 18 ₁ slidably by a cylinder 19, 19 ₁ .
The該用tufts clamp portions 8 ₁ detachably moved relative to the use tuft holding hole 11 performs a use tuft supplied. That is, the hair use away use tufts clamp portions 8 ₁ bundle holding hole 1
Is positioned in one of the upper, previously inserted putting use hair bundle 1 into the insertion hole is matched with the gripper plates 18 ₁ hole [FIGS. 5 (a)]. Then, the gripper plates 18 of the upper use tuft clamp unit 8 holds clamping the use bristle bundle 1 to be shifted in the cylinder 19, use of the molding die 10 to use tufts clamp portion ₈₁ of the lower lowers moved It is made to match the hair bundle holding hole 11 (FIG. 5B). When the bristle bundle clamp portion 8 holding and tightening the bristle bundle 1 is moved down, the bristle bundle 1 is moved.
Is introduced filled into use tuft holding hole 11 is guided while the narrowing pull the hair bundle insertion hole of the clamp portion ₈₁ use the lower [FIG 5 (c)]. Further, the gripper plate 18 of the upper hair bundle clamp unit 8 is returned, and the lower hair bundle clamp unit 8 is returned.
The gripper plate 18 ₁ is displaced by the cylinder 19 ₁ to tighten and hold the hair bundle 1, and then the upper hair bundle clamp portion 8 is raised along the hair bundle 1. [FIG. 5 (d)]. Subsequently, the hair use by loosening the clamp to return the gripper plate 18 ₁ of the hair use while retaining tightened use hair bundle 1 of the lower bundle clamp portion ₈₁ by shifting the gripper plate 18 above the use tuft clamp portion 8 molding die raises the bundle clamp portion 8 ₁ 10
And the cutter 6 is moved forward to approach the hair bundle 1. [Fig. 5e)]. Thus, when the cutter 6 is moved and advanced along the forming die 10, the bristle bundle 1 is sheared, and cutting can be performed with the bristle bundle holding hole 11 of the forming die 10 filled with the bristle bundle 1. After the cutting, the gripper plate 1 of the upper hair bundle clamp portion 8 is cut.
8 (FIG. 5 (f)), and if the cutter 6 is returned again, it is prepared for the next hair bundle supply step, and the position of each hair bundle holding hole 11 is repeated in the same operation step. if you ask sequentially shifting is matched to the insertion hole of the use tuft clamp portion 8, 8 ₁ a, use tufts filling each for tuft holding hole 11 is of efficiently performed. In addition, it is preferable to use a perforated plate having the number, arrangement and shape corresponding to the bristle bundle holding holes 11 in the molding die 10 or the bristle bundle insertion plate as the bristle bundle clamping gripper plates 18 and 18 _1. Good.

Further, in order to form the fused mass 2 at the end of the bristle bundle of the bristle bundle 1, the molding die 10 filled with the bristle bundle 1 or the plate for inserting the bristle bundle is introduced into the heating device 12. It is preferable that each bristle bundle 1 is extruded at the delivery portion of the piston, brought into contact with a heating plate and fused, and then the molding die 10 is incorporated into the injection molding die device 9 to perform injection molding of the brush handle.

[0010] In particular, after a hair bundle is filled in a part of the plate or the mold, each hair bundle is cut into a predetermined length by a cutting means and then introduced into a handle molding die, or Alternatively, before the hair bundle is filled in the mold, the hair bundle is cut into a predetermined length by the cutting means in advance. In order to perform mass production, one cavity (one brush head) to a number smaller than the total number of cavities outside the mold before drawing an arbitrary number of bristle bundles into the injection molding apparatus. It is preferable to supply the hair bundles to the holding holes of all the cavities by using a number of hair bundle supply devices capable of filling the hair bundles, thereby simplifying and reducing the size of the device and auxiliary equipment (spool shelves, etc.). Can be achieved.

When the hair bundle is introduced into a part of the plate or the mold, the number of hair bundles can be supplied from one cavity (one brush head) to less than the total number of cavities. The hair bristle feeder reduces the hair bristle volume to at least 2
It is preferable to fill the hair bundles for all cavities one by one or more times. That is, instead of preparing reels or hair bristle bundles for the number of holes in all mold cavities, filling the bristle bundles for all cavities with the minimum required number of bristle bundle feeders, for example, In the case of four brushes, it is preferable that the filling be repeated four times with the number of bristle bundles for one brush head.

It is also effective to divide and supply a plurality of bristle bundles in the brush head. That is, in the case of a flocking pattern in which hair bundles having different hair bundle cross-sectional shapes are combined, the hair bundles are supplied separately by using a hair bundle feeder for each hair diameter and the number of hair bundles.

In any case, before the arbitrary number of hair bundles are drawn into the injection molding apparatus, the same number and the same number of hair bundles as the hair bundle holding holes of the mold are provided outside the mold. The hair bundle can be cut into a predetermined length and supplied (filled) to a part of the plate or the mold having the holding hole by using the time during which the injection molding of the previous shot is performed. In addition, since the hair bundle can be narrowed down as needed, the molding efficiency is improved. Furthermore, a part of a plate or a mold can be used to perform a hair bundle supply / hair trimming step, etc., outside the injection molding mold, and since it is not necessary to incorporate these mechanisms into the injection molding mold, the mold is used. There is also an advantage that can be simplified.

A plurality of pistons of a delivery amount 7 are slidably inserted into each of the plurality of hair bundle holding holes 11 provided in the handle molding die 10, and each hair bundle 1 is stopped at a predetermined position to cause the fusion lump 2 And a hair bundle holding hole 11 for each hair bundle.
Has a diameter larger than the diameter of the piston, so that the hair bundle is easily supplied, and when the hair bundle is introduced, the ratio of the hair bundle cross-sectional area to the cross-sectional area of the hair bundle holding hole (hair filling rate) is stabilized. Care is taken to prevent the injection molding resin from entering between the bristle bundle and the holding hole of the mold so as to eliminate burrs. Further, the insertion distance of the bristle bundle 1 in the cavity 13 in the molding die 10 can be arbitrarily selected according to the thickness of the base of the flocking member or the thickness of the brush head portion. part 1 ₁ of the cylindrical annular rib portion formed as required around (not shown) from the base of the tufts is flocked portion, as it has upright without spreading outward keep hair standing better state Be considered.

In the embodiment shown in FIGS. 4 and 5, the hair bundle is cut into the hair bundle holding holes 11 of the molding die 10 after the hair bundle is cut by the cutting device having the cutter 6, and then the hair bundle is cut. This is a form in which the fusion mass 2 is formed at the end of the hair bundle for use.

[0016] In the example of FIG. 6, it intended to cut the pre-use hair bundle by cutting device in the preceding stage of filling the use hair bundle 1 in a part of the plate 10 ₁ or the mold to a predetermined length, of one FIG. 4 shows a hair bundle supplying step of a four-cavity mold in which a plate is repeatedly moved in four times by the number of hair bundles in the brush head portion to fill the hair bundles.

In FIG. 7, the mold outer plate 1
0 ₁ or a part of the mold is repeatedly divided into four times with the number of bristle bundles for one brush head. In this example, a bundle of hair is supplied from a 16-cavity mold in which the bundle is uniformly filled.

In the present invention, the following characteristic method is also included in using the brush. After filling the hair bundle in a part of the plate or the mold,
A method for manufacturing a brush in which each bristle bundle is cut into a predetermined length by a cutting means and then introduced into a handle forming die. A method of manufacturing a brush in which the hair bundle is cut into a predetermined length by a cutting means before the plate or the mold is filled with the hair bundle. When the hair bundle is introduced into a part of the plate or the mold, the number of hair bundles can be supplied from one cavity (one brush head) to a number smaller than the total number of cavities. A method of manufacturing a brush in which a hair bristle amount is divided into at least two times by supply, and hair bunches for all cavities are sequentially filled. A method for manufacturing a brush in which a plurality of bristle bundles in a brush head are separately supplied using a bristle bundle supply device for each bristle diameter and the number of bristle bundles.

[0019]

According to the present invention, a bristle bundle made of a thermoplastic synthetic resin is introduced into a plurality of bristle bundle holding holes provided in a handle forming die, and one end of the bristle bundle is projected. Forming the protruding end into a fusion mass having a cross section larger than the cross section of the holding hole by the heating means, positioning the fusion mass in the cavity of the handle molding die, and then introducing the thermoplastic synthetic resin molding material. Thus, in the method of manufacturing a brush in which the hair bundle is integrally planted on the handle, the hair bundle is carried out from a plurality of reels around which the hair bundle is wound, and the hair bundle supply device feeds the hair bundle. A hair bundle is previously introduced into a part of a plate or a mold having the same number of hair bundle holding holes in the same arrangement as the hair bundle holding holes, and cut into a predetermined length by a cutting device. Injection molding machine for part of plate or mold filled with By incorporating and injection molding, when manufacturing a brush with a hair bundle integrated into the handle, a special mold system is required with a simple mold structure that ensures insert molding of the hair bundle. It can be suitable for mass production without any problems, can have good quality, high appearance quality and high reliability, and can simplify and compact the manufacturing equipment and greatly improve productivity. effective.

[Brief description of the drawings]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a process explanatory view of a production method according to an embodiment of the present invention, wherein (a) is a hair bundle insertion step, (b) is a fusion lump forming step, (c) is a step immediately before injection molding, and (d) is an injection molding step. , (E) show the release step.

FIG. 2 is an enlarged vertical sectional view of a part of a molding process of the example of FIG.

FIG. 3 is a cross-sectional view of the example of FIG.

FIG. 4 is a system explanatory diagram of another embodiment of the present invention.

5 is a detailed operation explanatory view of the hair bundle supply of the example of FIG. 4,
The hair bundle is filled in the steps (a) to (f).

FIG. 6 is a system explanatory diagram of still another embodiment of the present invention.

FIG. 7 is a system explanatory diagram of still another example of the present invention.

[Explanation of symbols]

DESCRIPTION OF REFERENCE NUMERALS ₁ hair bundle 2 fusion mass 3 handle 4 reel 5 hair bundle supply device 6 cutter 7 delivery unit 8, 8 ₁ hair bundle clamp 9 injection molding device 10 handle molding die 11 hair bundle holding hole 12 heating device 12 ₁ Heat source 13 Cavity 14 Receiving plate

Claims (2)

[Claims] 1. A hair bundle made of thermoplastic synthetic resin is introduced into a plurality of hair bundle insertion holding holes provided in a handle molding die or plate, and one end of the hair bundle is projected,
Forming the protruding end into a fusion mass having a cross section larger than the cross section of the holding hole by the heating means, and positioning the fusion mass in the cavity of the handle molding die before introducing the thermoplastic synthetic resin molding material. A method of manufacturing a brush in which a hair bundle is integrally planted on a handle, the hair bundle is unloaded from a plurality of reels around which the hair bundle is wound, and the hair bundle feeding device feeds the hair of a molding die. A hair bundle is introduced in advance into a part of a plate or a mold having the same number of hair bundle holding holes in the same arrangement as the bundle holding holes, cut into a predetermined length by a cutting device, and filled with the hair bundle. A method for manufacturing a brush, characterized in that a part of a set plate or a mold is incorporated into an injection molding apparatus to perform injection molding. 2. A hair bundle of one cavity (one brush head) to less than the total number of cavities can be supplied when the hair bundle is introduced into the handle molding die or plate. 2. The method for manufacturing a brush according to claim 1, wherein the amount of the bristle bundle is divided into at least two or more times by supplying a number of bristle bundles, and the bristle bundles for all cavities are sequentially filled.