JP2003061754A - Method and apparatus for manufacturing brush - Google Patents

Abstract

PROBLEM TO BE SOLVED: To ensure the flocking strength of a using bristle bundle which is planted on a base board, and at the same time, prevent the using bristle bundle from twisting, increase the aligning property of the bristle standing of the using bristle bundle, and also, prevent a head shape from being damaged by a heating body, and prevent burr from being generated on the planting section of the using bristle bundle. SOLUTION: For this manufacturing method for a brush 10, the base end surface of the using bristle bundle 18 which protrudes from a using bristle bundle inserting hole 17 on the back surface side of the base board 11, is heated by the heating body and molten. Then, a melt pressing surface 18A which closes the using bristle bundle inserting hole 17 is molded on the base surface side of the base board 11.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and apparatus for manufacturing a brush, such as a toothbrush, which has a hair-implanted portion and a handle portion.

[0002]

2. Description of the Related Art In the production of toothbrushes, a method of fixing a bristle bundle with a metal member after inserting the bristle bundle into a bristle bundle insertion hole has been widely used. However, although this method can easily configure the device, it has disadvantages such as the fact that the thickness of the tooth-implanted portion of the toothbrush cannot be made thin, and that oblique hair implantation is difficult. This tendency is particularly strong in a brush having a small bristling portion such as a toothbrush. On the other hand, as a method that does not use a metal member, there are the following three methods, each of which is used properly according to the purpose.

(1) Type I (for example, Japanese Patent Publication No. 616725, US
P4635313) Insert the bristle bundle into the bristle bundle insertion hole of the molding die (cavity) having the bristle bundle insertion hole, fill the bristle bundle base with a plastic material, and integrally manufacture the handle part of the toothbrush. how to. In this method, due to the structure of the cavity, when the molding pressure is increased, the plastic material easily leaks from the gap between the hair bundle insertion holes.

(2) Type II (eg, USP5458400, Japanese Patent Laid-Open No. 9-182632) A hair bundle is planted on a substrate having a large number of preformed hair bundle insertion holes, and this hair bundle is planted. The substrate is placed in a mold and the opening of the substrate is filled with a plastic material.
In this method, although the step of molding the substrate is increased, hair bundles are implanted in the substrate filled with the plastic member,
Since there is a close contact portion between the substrate and the hair bundle, leakage of the filler from between the substrate and the hair bundle when filling with the plastic member is less likely to occur than in Type I.

(3) Type III (for example, Japanese Examined Patent Publication No. 6-46962) A substrate having a hair bundle insertion hole for a hair bundle insertion hole portion and a hair bundle base portion are both heated and brought into close contact with each other. How to crimp a bundle. This method is likely to cause variations in quality in fixing the hair bundle.

[0006] These three methods are properly used according to the purpose. When oblique hair transplantation or thick hair tuft transplantation is required, type I and type II are more advantageous, and type III has flocking strength. Is rarely used because of its variability. Type I and type II are the same in that the brush handle part is formed while the bristle bundle is held and the planting part is integrated, and both are insert molding methods. Therefore, although the leakage of the plastic material from the gap of the hair bundle insertion hole is less in the type II as described above, it remains a common problem.

To solve this problem, studies have been made to reduce the gap between the hair bundle insertion holes as much as possible. For example, in Japanese Patent Laid-Open No. 10-52316, the following study is conducted. That is, the hair bundle is introduced into the holding hole for hair bundle insertion provided in the mold, the protruding end of the hair bundle is formed into a fused mass having a cross section larger than the cross section of the holding hole by the heating means, After the fused mass is positioned inside the cavity of the handle mold, the thermoplastic synthetic resin molding material is introduced (injected). In Japanese Patent Laid-Open No. 10-52316, a resin having a low resin flow characteristic value of 17 to 40 g / 10 min is used as the molten resin injected into the handle mold.

As described above, when a resin having a low fluidity is used, it is necessary to increase the molding pressure. However, if the molding pressure is increased, the bristle tufts are easily disturbed and the hair tuft insertion hole The resin leaks easily. Therefore, the actual conditions are that the resin used and molding conditions (particularly molding pressure) are limited.

Further, USP 5458400 and Japanese Patent Laid-Open No. 9-182632 disclose a method of forming a protruding end portion of a tuft of hair into a fused mass by a heating means in the manufacturing method of type II. In this method, the fused mass is also disclosed. However, there is a problem in that, during formation, the hair bundle is easily twisted or disturbed, and the substrate is easily deformed by heat generated by the heating means.

[0010]

DISCLOSURE OF THE INVENTION An object of the present invention is to provide a method for manufacturing a brush in which a handle portion is filled after inserting a bristle tuft, even if oblique bristle tufting or thick bristle tufting is performed. To provide a method for manufacturing a brush that is free from twisting, has good bristling alignment of the bristle tufts, has high bristle transplantation strength, does not leak resin from the tufts for hair tuft insertion, and does not deform or damage the brush body is there. Another object of the present invention is to provide a method for producing a brush, which eliminates the resin and the molding conditions as described above.

[0011]

The present invention is based on the above type II.
The problem is solved by the method. The invention of claim 1 is a method of manufacturing a brush for fixing a bristle bundle to a substrate of a brush, wherein the bristle bundle is used from a bristle bundle insertion hole of the substrate installed on the bristle bundle holding jig. The hair bundle is fixed to the hair bundle shaping hole of the hair bundle holding jig, the hair bundle is planted in the hair bundle insertion hole of the substrate, and the hair bundle of the hair bundle protruding from the hair bundle insertion hole is located on the back side of the substrate. The base end face is heated and melted by a heating means to form a molten mass or a molten press face for closing the hair bundle insertion hole on the back side of the substrate,
Position the substrate on which the hair bundle is planted and the hair bundle holding jig in the molding device, and fill the space formed on the back side of the substrate by the molding device with the filler to fix the hair bundle to the substrate. It is the one.

According to a ninth aspect of the present invention, there is provided a brush manufacturing device for implanting a bristle bundle on a base plate of a brush, which is (1) a holding device for positioning and fixing a bristle bundle holding jig having a base plate installation portion. And (2) a sleeve and the sleeve, wherein the hair bundle insertion hole of the board and the hair bundle shaping hole of the hair bundle holding jig are in a continuous state when the board is installed. An extruding means for the hair tuft contained in the hair tuft, so that the tuft may be communicated from the hair tuft insertion hole of the substrate to the hair tuft shaping hole of the hair tuft holding jig by the pushing means. (3) A hair bundle planting device for planting the hair bundle, and (3) the base end surface of the hair bundle protruding from the hair bundle insertion hole on the back side of the substrate is melted by heating, and the back surface of the substrate. A heating device that forms a molten mass that closes the hair bundle insertion hole on the side, or the base end surface of the hair bundle that protrudes from the hair transplant hole on the back side of the substrate. A hair bundle end face pressing device having a heating means for forming a melt press surface for closing the hair-implanting holes on the back surface side of the substrate after heating and melting, and (4) the substrate on which the hair bundle is planted and the hair-bundle holding device. A molding device for positioning the jig,
(5) The molding device has a filling device that fills the space formed on the back side of the substrate with the filling material.

The term "hole axis" of the hole axis of the hair bundle insertion hole in the present specification refers to the length direction of the hair when the hair bundle is held (inserted) in these holes. Means the direction along. In addition, the phrase "back surface of the substrate" refers to the surface of the substrate opposite to the side where the bristle bundles protrude when the product is a toothbrush product.

The term "fixed" in the present specification means that the hairs in one hair bundle are melted and then bonded to each other, or that a plurality of hair bundles are melted and bonded to each other. Refers to. When the hair bundle is fused and fixed by the melting or the melt pressing according to the present invention, the hair bundle and the substrate do not always adhere to each other. Hair material and substrate material,
In addition, there are cases where they are adhered by a heating means or a melt pressing means, but in many cases, nylon, which is a typical bristle material, or polypropylene, which is a material for the substrate, does not adhere.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION The structure of a toothbrush manufacturing apparatus and its operation are shown below. (1) The substrate 11 of the toothbrush 10 is molded by the substrate molding die 20 (upper mold 21 and lower mold 22) of FIG. In this embodiment, the substrate 11 is composed of the head 14 integrally formed with the handle 12 via the neck 13. As shown in FIG. 2, the head 14 has a rear surface filling recess 1 surrounded by a rising wall 15 provided on the outer edge of the rear surface.
6, a plurality of hair bundle insertion holes 17 are penetratingly formed on the substrate surface of the planting portion 16A defined within the range of the back filling concave portion 16, and the hair bundles 18 are provided in the respective hair bundle insertion holes 17. Can be planted.

Here, the substrate 11 is composed of a head 14 integrally formed with the handle 12 (neck 13),
After the step of implanting in the head 14 which will be described later, the back surface filling concave portion 16 of the head 14 is secondarily filled with the back surface filling material 19. The form of the substrate may be composed of only the head 14, but the substrate has a hair bundle insertion hole for implanting the hair bundle. The substrate material is usually plastic, but ceramic, wood, pulp laminates,
Materials other than plastics such as metals can also be used within the scope of the present invention.

Since the substrate 11 is provided with the rising wall 15 which is continuous all around the outer edge of the head 14, the back filling recess 16 is provided.
The back surface filler 19 has good adhesiveness to the back surface, and the bending strength of the head 14 can be enhanced.

Further, by providing an uneven shape 15A (FIG. 2 (D)) on the rising wall 15 which is continuous all around the outer edge of the head 14, the base end surface of the hair bundle emerging from the hair bundle insertion hole 17 is formed. When the melted body is heated and melted by a heat body to form a melted mass or a band-shaped melt press surface that closes the hair bundle insertion hole on the back side of the substrate 1, the heat body forms the outer edge shape of the head 14.
Since it does not come into contact with 5B, it is possible to prevent the deformation of the surface 15B forming the outer edge shape of the head 14 due to the heat body, and the back filling recess 1
The surface area of 6 becomes large, the adhesion of the back filling material 19 to the back filling recess 16 is good, and the bending strength of the head 14 can be enhanced. Incidentally, the uneven shape 15A may be provided at a part of the rising wall 15 which is continuous with the outer edge of the head 14 instead of the entire circumference thereof.

The substrate 11 is provided with the rising wall 15 only on a part of the outer edge of the head 14, or the rising wall 15 is provided.
It may not be provided at all.

As the resin constituting the substrate 11, any of polypropylene, acrylonitrile-styrene copolymer, acrylonitrile-butadiene-styrene copolymer, polycarbonate, polymethylmethacrylate, unsaturated polyester, etc. may be adopted. It suffices if the necessary strength and durability such as 10 can be secured. Hair bundle 1
As the bristles of No. 8, polyethylene, nylon (polyamide type), etc. can be adopted.

(2) The substrate 11 is installed on the hair bundle holding jig 30 for. As shown in FIG. 3, the hair bundle holding jig 30 for the substrate 1
No. 1 installation part 31 and the board 11 installed in the installation part 31
The hair bundle shaping hole 32 connected to the hair bundle insertion hole 17 is provided. The hair bundle holding jig 30 in FIG. 4 is divided into an upper divided body 30A and a lower divided body 30B by a line 30L, and has a structure in which the hair bundles can be fixed by sliding (sliding surface 30L) on each other. . With this structure, after the hair bundle is inserted into the hair bundle insertion hole 30, the hair bundle can be fixed by sliding in the direction intersecting the hole axis of the hair bundle insertion hole 30. As a result, the movement of the hair bundle is suppressed during the melting or melt pressing treatment of the present invention, and the alignment of the end faces of the hair bundle is improved, which is preferable.
The slide mechanism for the upper and lower divided members of the hair bundle holding jig 30 may be divided into three or more. In the slide mechanism, the relative movement distance is about 0.1 mm to 1 mm, and the movement amount is selected depending on the state of holding the hair bundle.

The hair bundle holding jig 30 has a hair bundle shaping hole 32.
The bottom surface of the hole is set to a shape to be applied to the tip of the hair bundle 18. By forming the tip shape of the extruding pin 51, which will be described later, into substantially the same shape (fitting shape) as the hole bottom shape of the hair bundle shaping hole 32, the formability of the tip portion of the hair bundle 18 can be improved.

(3) The hair bundle 18 is picked by the sleeve 40 that accommodates the hair bundle 18 (FIG. 3). Then, the bristle bristle planting device 50 pushes the bristle bristle 18 housed in the sleeve 40 by the push pin 51,
Is planted in the hair bundle shaping hole 32 of the hair bundle holding jig 30 from the hair bundle insertion hole 17 of the substrate 11 installed in the hair bundle holding jig 30, and the base of the hair bundle 18 is set to the substrate. 11 is planted in the hair bundle insertion hole 17 and the tip of the hair bundle 18 is pressed against the hole bottom surface of the hair bundle shaping hole 32 (FIG. 3).

(4) As shown in FIG. 4, the bristle bundle end face melt pressing device 60 applies the impulse welding machine 100 to the base end face of the bristle bundle 18 protruding from the bristle bundle insertion hole 17 on the back side of the substrate 11. It is heated by a (heater) and melt-pressed to form a band-shaped (sheet-shaped) melt-pressed surface 18A (FIG. 5) that closes the hair bundle insertion holes 17 on the back side of the substrate 11. The melt press surfaces 18A of the bristle bundles 18 are not limited to those in which adjacent ones are continuously formed into a band shape as described above, but may be individually formed into a lump shape.

In the process of melting and pressing the end of the bristle bundle, in order to prevent twisting and irregularity of fluffing of the bristle bundle, it is preferable to improve the alignment of the end face for melting the planted bristle bundle. . In order to improve the alignment, the hair bundles that have been planted are sufficiently shaped by the hair bundle shaping holes 32 of the hair bundle holding jig 30 so as to shape It is preferable to slide and fix the upper split body 30A and the lower split body 30B of the hair bundle holding jig 30.

It should be noted that, after melt-pressing with the impulse welding machine 100 (FIG. 10), ultrasonic vibration is applied from the beginning by further melt-pressing with ultrasonic vibration using the ultrasonic welding machine 200 (FIG. 11). By applying ultrasonic vibration, the substrate 11 and the bristle bundle 18 can be melted and fixed by frictional heat over a long length range of the bristle bundle 18 without causing twisting of the bristle bundle 18 due to. , The substrate 11 and the bristle bundle 18 are pressed while vibrating to firmly bond them so that they are mechanically entangled.
The pull-out strength of can be enhanced.

During melt pressing, the periphery of the rising wall 15 of the head 14 and the neck portion 13 are held by the shape holding jig 3.
After positioning and holding at 3, the base end surface of the hair bundle 18 is heated and melt pressed. This can prevent the surroundings of the rising wall 15 of the head 14 and the neck portion 13 from being deformed by heating. Since the shape holding jig 33 is intended to protect a portion that is easily deformed by heating,
It is not always necessary to cover the periphery of the rising wall 15 and the entire neck portion 13, and the structure and material may be selected according to the material of the substrate 11 and the thickness of each part constituting the substrate 11.
When the wall thickness of the rising wall 15 is thin and easily deformable, a shape holding jig 33 having a structure for covering the inner surface of the rising wall 15 on the back filling recess 16 side may be used. When the amount of heat required for melting / melt-pressing the hair bundle 18 and the substrate 11 is large and the amount of heat or the temperature of the heat body is high, a cooling mechanism such as water cooling or air cooling is attached to the shape holding jig 33 of the head 14. With the provision, it is possible to prevent an excessive temperature rise of the shape holding jig 33 of the head 14 and prevent the periphery of the rising wall 15 of the head 14 and the neck portion 13 from being deformed by heating. The same effect can be obtained by forming the shape holding jig 33 with a material having a high heat insulating property.

As shown in FIG. 10, the impulse welding machine 100 is provided with a press tip 101 for instantaneously generating heat by supplying electric power to an electric resistance heating element, and a cooling device 102 for rapidly cooling the press tip 101. The driving device 103 presses 101 onto the back surface of the substrate 11 via the base end surface of the bristle bundle 18. Impulse welding machine 100
Is a melt press process of the base end surface of the hair bundle 18, and FIG.
As shown in, the primary heating time (heat necessary for melting the base end face of the hair bundle 18 is generated by the press tip 101,
(Time to transfer to the base end surface of the hair bundle 18 for melting), intermediate time (time to prevent excessive temperature rise due to primary heating and transfer heat generated by primary heating to the base end surface of the hair bundle 18 to melt) Second heating time (time to replenish the heat necessary for melting and melt-pressing the substrate 11 and the base end surfaces of the hair bundles 18 and transferring the heat to the base end surfaces of the hair bundles 18 for melting), melt pressing Time (Excessive temperature rise due to secondary heating is prevented, and heat generated by secondary heating is applied to the substrate 11 and the hair bundle 1.
8 to the base end face to melt the substrate 11 and the bristle bundle 18 for melt-pressing, cooling time (cooling the press chip 101 with air, and the melting press surface 18A of the substrate 11 and the bristle bundle 18). Cooling and sticking time), desorption heating time (hair bundle 18 (melt pressing surface 18A) and press tip 1)
01 is heated again for facilitating separation, and a delay time (during this time, the hair bundle 18 (melt press surface 18)
(A) is separated from the press chip 101), and a re-cooling time (a time for cooling the press chip 101 that has become hot due to detachment heating) elapses. However, the steps may be simplified or additional steps may be added depending on the amount of heat necessary for melting / melt-pressing the bristle bundle 18 and the substrate 11, the resin adhesion state to the press chip 101, and the like. Impulse welding machine 100
Is provided with a convex portion 101A (or a concave portion) on the surface of the press tip 101 in contact with the base end surface of the bristle bundle 18,
The mutual fusion portion of the substrate 11 and the bristle bundle 18 is formed by the convex portion 101A.
It is possible to form an adhesive state in which the two are pushed in by (or a concave portion) and mechanically entangled with each other.

The hair bundle end surface pressing device 60 uses the ultrasonic welding machine 200 in combination with the impulse welding machine 100, if desired, so that the lower end surface of the hair bundle 18 is impulse welded by the impulse welding machine 100.
After melting and heating with the impulse welding machine 100, the base end surface of the hair bundle 18 is melt-pressed with ultrasonic vibration generated by the ultrasonic welding machine 200 to form the melting press surface 18A. You can also do it.

As shown in FIG. 11, the ultrasonic welding machine 200 has a press tip 20 connected to an ultrasonic vibrator 201.
The press tip 202 is pressed against the back surface of the substrate 11 by the driving device 203 via the base end surface of the hair bundle 18 while ultrasonically vibrating 2 (horn). The ultrasonic welding machine 200
During the descending process of the press tip 202 from the origin position by the drive device 203, the press tip 2 is pressed from the timing when the press tip 202 contacts the bristle bundle 18 to the descending end.
02 is vibrated, and the press tip 202 is held at the descending end for a certain period of time to cool and hold the melt press surface 18A formed on the base end surface of the hair bundle 18 (FIG. 11). It should be noted that the press tip 202 may start vibrating at the timing at the origin position before contacting the hair bundle 18.

The ultrasonic welding machine 200 includes a press tip 20.
By providing the convex portion 202A on the surface of the bristle bundle 18 in contact with the base end surface of the bristle bundle 18, the mutual fusion portion of the substrate 11 and the bristle bundle 18 is pushed by the convex portion 202A so that both can be mechanically entangled. A bonded state can be formed.

(5) The substrate 11 with the hair bundle 18 inserted therein and the hair bundle holding jig 30 are positioned in the mold 71 of the molding apparatus 70 (FIG. 6).

(6) The back filling material 19 discharged from the inlet 72 (gate) of the die 71 of the molding apparatus 70 by the filling device 80 is filled with the back filling material 19 in the back filling recess 16 of the substrate 11.
On the back side of the hair bundle 18 (melt press surface 1
8A) It is injected into the space formed around it (the space of the back filling concave portion 16) and adhered to fix the hair bundle 18 to the substrate 11 (FIG. 7). After the filling material 19 is solidified, the mold 71 is opened, the toothbrush 10 and the bristle bundle holding jig 30 are taken out (FIG. 8), and the toothbrush 10 is removed from the bristle bundle holding jig 30 (FIG. 9).

The filling device 80 may be an injection molding machine 81. The injection molding machine 81 shown in FIG. 7 has an injection cylinder and an injection plunger arranged vertically, but may be arranged horizontally. The gate system of the injection port 72 of the molding apparatus 70 may be a cold runner system or a hot runner system.

The material used as the filler 19 may be the same as or different from the substrate 11, and may be a hot melt adhesive or an elastomer.

The filler 19 is blended with the constituent material of the substrate 11 or the hair bundle 18 and a material having an adhesive property by thermal adhesion or chemical adhesion in order to strengthen the adhesive force with the substrate 11 or the hair bundle 18. That is, it is preferable to heat the substrate 11 or to raise the temperature of the mold 71 to increase the thermal adhesiveness, and to increase the melting temperature at the time of injecting the filler 19 itself. Further, when the injection pressure of the filler 19 is increased, the adhesive force with the substrate 11 and the hair bundle 18 is strengthened, and the appearance (sink) is improved. Substrate 11 also
In order to strengthen the adhesive force between the bristle bundle 18 and the filling material 19, some of the constituent materials of the bristle bundle 18 and the filling material 19 are mixed, or the constituent materials of the bristle bundle 18 and the filling material 19 are heat-bonded. It is also possible to mix a material having adhesiveness by chemical adhesion or to perform a primer treatment.

According to this embodiment, there are the following effects. Space formed on the back surface side of the substrate 11 (back surface filling recess 1
Prior to implanting the filling material 19 into 6) and fixing and implanting the bristle bundle 18 on the substrate 11, the base end surface of the bristle bundle 18 protruding from the bristle bundle insertion hole 17 on the back side of the substrate 11. Was melt-pressed to form a melt-pressed surface 18A of the hair bundle 18 for closing the hair bundle insertion hole 17 on the back surface side of the substrate 11.

As described above, the melt press surface 18A is prevented from coming off the hair bundle 18 from the hair bundle insertion hole 17 of the substrate 11.
Will be blocked, and sufficient flocking strength can be secured.

As described above, the filler material 19 injected into the space on the back surface side of the substrate 11 (rear surface filling concave portion 16) smoothly flows on the melt press surface 18A at the base of the bristle bundle 18 and the space (concave portion). 16), which does not impart a collision force for tilting the hair tufts 18 to the base of the tufts 18 and improves the alignment of the tufts of the tufts 18 with respect to the substrate 11. . Further, since the hair bristle insertion hole 17 facing the space (recess 16) on the back side of the substrate 11 is closed by the above-mentioned melt press surface 18A of the hair bristle 18, the space (recess 16) is loaded. The filling material 19 does not leak into the hair bundle insertion hole 17, and burrs do not occur in the planting portion of the hair bundle 18.

By performing melt-pressing with the impulse welding machine 100, it is possible to gently press the bristle bundle 18 without applying mechanical vibration to the bristle bundle 18. Therefore, when the melt-pressed surface 18A of the bristle bundle 18 is formed. Disturbance of fluffing due to twisting of the hair bundle 18 can be prevented.

Further, the hair bundle insertion hole 1 for hair is provided on the back side of the substrate 11.
After the base end surface of the hair bundle 18 coming out of 7 is melted by a hot body such as hot air or a laser as a first-stage heating means, and then melt-pressed by an impulse welding machine 100 as a second-stage heating means, the heating means Is more preferable than the case where the number of hairs is only one step, because the hair transplanting strength (pulling strength) of the hair bundle and the hair is improved. The reason why the flocking strength is improved when the two-stage heating means is used is that the hair bundle insertion hole 17 for hairs is provided on the back side of the substrate 11 in the first-stage heating means, which is a non-contact type heating body such as hot air or laser. Since the entire base of the bristle bundle 18 projecting from the hair is heated, the melting region in the length direction of the bristle is widened and melt-pressed by the second-stage impulse welding machine, so that the melt-pressed surface is wide. It is presumed that it is formed over the range.

As shown in FIG. 2D, the rising wall 15 provided on the outer edge of the back side of the substrate 11 is provided with the uneven shape 15A so that the heat body comes into contact with the surface 15B forming the outer edge shape of the head 14. Therefore, the shape deformation of the head 14 due to the heat of the heating element can be prevented.

After the head shape holding jig 33 shown in FIG. 4 is positioned on the back side of the head 14, a heating element (especially hot air,
By heating and melting the base end face of the hair bundle 18 coming out from the hair bundle insertion hole 17 to the back side of the substrate 11 by a contact type heat body such as a laser, the outer edge shape on the back side is deformed by heat. A good appearance is obtained without

If the shape holding jig 33 of the head 14 is equipped with a cooling mechanism such as water cooling or air cooling, the hair bundle 18 and the substrate 1
Particularly when the amount of heat required for melting or melt-pressing No. 1 is large and the amount of heat or the temperature of the heating element is high, it is possible to prevent an excessive temperature rise of the shape holding jig 33 of the head 14. Therefore, the periphery of the rising wall 15 of the head 14 and the neck portion 1
3 is preferable because deformation due to heating can be prevented.

After melt-pressing with the impulse welding machine 100, the heating part (molten resin) is cooled and fixed with air or the like so that the thread of the molten resin is not pulled when the impulse welding machine 100 is separated from the heating part. Resin adhesion can be prevented.

After melt-pressing with the impulse welding machine 100, further melt-pressing with ultrasonic vibration using the ultrasonic welding machine 200 does not cause twist of the hair bundle 18 due to application of ultrasonic vibration from the beginning. By applying ultrasonic vibration, the substrate 11 and the bristle bundle 18 can be melted and fixed by frictional heat over a long length range of the bristle bundle 18, and the substrate 11 and the bristle bundle 18 can be vibrated. It is possible to strengthen the pull-out strength of the bristle bundle 18 by pressing and firmly adhering them so that they can be mechanically entangled.

The projections 101A on the press tips 101 and 202 of the impulse welding machine 100 and the ultrasonic welding machine 200,
By providing 202A, the mutual fusion portion of the substrate 11 and the bristle bundle 18 is pushed by the convex portions 101A and 202A to form an adhesive state in which the both are mechanically entangled, and the bristle bundle 18 resistance is improved. The pull-out strength can be enhanced. Even when the substrate 11 and the bristle bundle 18 are made of different materials that do not exhibit mutual adhesiveness, they can be pseudo-bonded.

In the bristle bundle end surface pressing device 60 of the present invention, the heating body is not limited to the impulse welding machine. Further, the filling device 80 of the present invention may be an applicator (such as an air pump type, a gear pump type or a screw pump type) for a hot melt adhesive or the like.

[0049]

As described above, according to the present invention, the hair-fixing strength of the bristle tufts to be planted on the substrate is ensured, the alignment of the tufts of the tufts for tufts is improved, and the head is heated by the heating element. It is possible to prevent burrs from being generated in the planting portion of the hair bundle without impairing the shape.

[Brief description of drawings]

FIG. 1 is a schematic view showing a substrate and a molding die thereof according to a first embodiment.

FIG. 2 is a schematic view showing a main part of a substrate.

FIG. 3 is a schematic view showing a hair bundle holding jig and a hair bundle planting device.

FIG. 4 is a schematic view showing a hair bundle end surface pressing device.

FIG. 5 is a schematic view showing a state of forming a melt-pressed surface of a hair bundle.

FIG. 6 is a schematic view showing a positioning state of a substrate on a molding apparatus.

FIG. 7 is a schematic diagram showing a resin injection state by a molding apparatus.

FIG. 8 is a schematic diagram showing a mold opening state of the molding apparatus.

FIG. 9 is a schematic diagram showing a state in which the toothbrush is removed from the substrate holding jig.

FIG. 10 is a schematic diagram showing an impulse welding machine.

FIG. 11 is a schematic view showing an ultrasonic welding machine.

[Explanation of symbols]

10 Toothbrush (brush) 11 board 12 handles 13 neck 14 heads 15 rising wall 16 Back filling recess 16A planting section Hair bundle insertion hole for 17 Hair bundle for 18 18A Melt press surface (base) 19 Filling material 20 Substrate molding die Hair bundle holding jig for 30 30A Upper division 30B Lower division 30L slide surface 31 Installation Department Hair bundle shaping hole for 32 33 Head shape holding jig 40 sleeve 50 hair bundle planting device 51 Extrusion pin Hair bundle end face press device for 60 70 Molding equipment 71 mold 72 Inlet (gate) 80 filling device 100 Impulse welding machine (heat body) 101,202 Press chip 101A convex part 102 cooling device 103, 203 drive device 200 ultrasonic welding machine 201 ultrasonic transducer

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Mikiya Kubota             Kao Stock Exchange 2606, Akabane, Kai-cho, Haga-gun, Tochigi Prefecture             Company research institute F term (reference) 3B202 AA06 AB19 BA02 BA09 DB01                       ED08 EE01 EF10 EG03 GA01                       GA28 HA02 HA03                 4F206 AD18 AD23 AD27 AH72 JA07                       JB12 JF05

Claims (11)

[Claims] 1. A method of manufacturing a brush for immobilizing a bristle bundle on a substrate of a brush, wherein the bristle bundle is inserted from a bristle bundle insertion hole of a substrate installed on a bristle bundle holding jig. The bristle bundle shaping hole of the holding jig is planted, the bristle bundle is planted in the bristle bundle insertion hole of the substrate, and the base end face of the bristle bundle protruding from the bristle bundle insertion hole on the back side of the substrate. Is heated and melted to form a molten mass or a molten press surface that closes the hair bundle insertion hole on the back side of the substrate, and the substrate on which the hair bundle is planted and the hair bundle holding jig are positioned in the molding device. A method for manufacturing a brush, in which a molding device fills a space formed on the back side of the substrate with a filler to fix the bristle bundle to the substrate. 2. A base end surface of the hair bundle is heated and melted by a heating body to form a molten mass or a melt press surface, and then the base end surface of the hair bundle is cooled and fixed. The method for manufacturing the brush according to claim 1. 3. A base end face of the hair bundle is heated and melted by a heating body to form a molten mass or a melt press surface by another heat body, and then the base end face of the hair bundle is cooled and fixed. The method for manufacturing the brush according to claim 1. 4. The method for manufacturing a brush according to claim 1, wherein the heating element is separated from the end surface of the base portion of the bristle bundle by heating means. 5. The base end surface of the hair bundle is heated and melted by a heating body to form a molten mass or a melt press surface, and then the base end surface of the hair bundle is melted by ultrasonic vibration. The method for manufacturing a brush according to claim 1, which comprises pressing. 6. The method for producing a brush according to claim 1, wherein after the shape holding jig of the brush head is positioned on the back surface side of the substrate of the brush, the base end surface of the bristle bundle is heated and melted. . 7. The method of manufacturing a brush according to claim 6, wherein the shape maintaining jig of the head is provided with a cooling mechanism. 8. The method for manufacturing a brush according to claim 1, wherein the rising wall that is continuous with the outer edge of the back side of the substrate is provided with an uneven shape. 9. A brush manufacturing apparatus for implanting a bristle bundle on a substrate of a brush, comprising: (1) a holding device for positioning and fixing a bristle bundle holding jig having a substrate mounting portion, A holding device which, when the substrate is installed, brings the hair bundle insertion hole of the substrate and the hair bundle shaping hole of the hair bundle holding jig into a continuous state,
(2) A sleeve and an extruding means for the hair bundle contained in the sleeve, the hair bundle being pushed by the extruding means from the hair bundle insertion hole of the substrate to the hair bundle holding jig. A hair bundle planting device for planting the hair bundle so as to communicate with the shaping hole, and (3) heating the base end face of the hair bundle protruding from the hair bundle insertion hole on the back side of the substrate. After heating and melting, a heating device that forms a molten mass that closes the hair bundle insertion hole on the back side of the substrate, or heats and melts the base end face of the hair bundle that comes out of the hair transplant holes on the back side of the substrate. A hair bundle end face press device having a heating means for forming a melt press surface for closing the hair transplant holes on the back side of the substrate, and (4) molding for positioning the substrate on which the hair bundle is planted and the hair bundle holding jig. And a filling device for filling the space formed by the molding device on the back side of the substrate with the filling material. Of manufacturing equipment. 10. The hair bundle end surface pressing device comprises a press tip for pressing the base end surface of the hair bundle, and the press tip has a convex portion on the surface in contact with the base end surface of the hair bundle. Brush manufacturing equipment. 11. The brush manufacturing apparatus according to claim 9, further comprising a shape holding jig for a brush head.