JP2000041737A - Pattern and its manufacturing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a handle with which the glossy feel of a satisfactory grip part may be obtd. without being affected by the surface characteristic of a grip handle part. SOLUTION: This handle has a handle 4 having the grip handle part 3 which is molded of a synthetic resin contg. colored pigments and armor bodies 5, 6 which are molded of a transparent synthetic resin and are disposed to cover this grip handle part 3. The handle described above is formed by insert molding and integrating the handle 4 and the armor bodies 5, 6. In such a case, gap parts 14, 15 are formed between the grip handle part 3 and the armor bodies 5, 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a toothbrush, for example,
The present invention relates to a handle such as a hair brush or a cleaning tool and a method for manufacturing the same, and more particularly, to a handle having a glossy grip and a method for manufacturing the same.

[0002]

2. Description of the Related Art To add commercial value, there are two methods of molding a toothbrush using a synthetic resin, for example, a method of molding with a rotary or core-back type two-color molding machine, and a method of molding in advance. There is an insert molding method in which the formed primary molded body is placed in a mold and molded.

[0003] Also, in the insert method, Japanese Patent Publication No. 7-3
As disclosed in Japanese Patent No. 6771, an exterior body having a through hole at a tip is previously formed into a cup shape, and then,
By disposing this exterior body in another mold, and by injection molding with a synthetic resin different from the synthetic resin forming the exterior body, a handle portion is formed in the exterior body and through the through hole. A method of forming a neck portion and a head portion so as to extend from the exterior body has also been proposed.

However, in these molding methods, when a transparent synthetic resin is used for the exterior body to make the grip part glossy, the flow of the resin, the pressure of the resin, the molding temperature of the resin, and the like cause an influence. The boundary surface between the body and the handle is deformed, and irregularities are formed. In order to avoid this problem, there is a method of using a resin whose molding temperature is significantly different from that of the primary molding, and using a resin whose temperature is lower than that of the primary molding. There were many things and transparency was bad. Further, since the above-mentioned boundary surface is in close contact, excellent glossiness cannot be obtained in the grip portion.

[0005]

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a handle having a glossy grip and a method of manufacturing the handle without impairing the surface condition of the handle.

[0006]

According to the first aspect of the present invention,
A handle having a handle portion molded of a synthetic resin containing a color pigment, and molded of a transparent synthetic resin,
And an exterior body provided to cover the handle.
The above object is achieved by providing a handle in which a gap is formed between the handle and the exterior body in a handle in which the handle and the exterior body are insert-molded and integrated. It was done.

According to a fourth aspect of the present invention, a handle having a handle is molded from a synthetic resin containing a coloring pigment, and the handle is covered with a void around the periphery of the handle. After molding the body with transparent synthetic resin,
The above object has been achieved by providing a method for manufacturing a handle by assembling the exterior body with the handle and by integrally molding the handle and the exterior body by insert molding.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail. [Embodiment 1] A handle 1 of a toothbrush according to Embodiment 1 is shown in FIG.
As shown in FIG. 2, a handle 4 formed by injection molding with a synthetic resin containing a color pigment and having a plurality of flocked holes into which a bunch of hairs is planted, a neck 2 and a handle 3. A pair of exterior members 5 and 6, which are exterior members provided so as to cover the handle 3 and are injection-molded with a transparent synthetic resin, include the handle 4 and the exterior member (a pair of exterior members). 5, 6) are integrated by insert molding.

As the synthetic resin forming the handle 4, it is preferable to use, for example, polypropylene (PP) resin, polyethylene terephthalate (PET), and acrylonitrile styrene (AS).

The neck 2 connects between the head (not shown) and the grip 29 formed by covering the handle 3 with the exterior bodies 5 and 6, so as to obstruct the mouth. The width is smaller than that of the head portion and the grip portion 29 so as not to be disturbed. The grip portion 3 is a grip portion 2 that is easy to grip when brushing teeth.
9 is formed wider than the head portion and the neck portion 2 so as to form 9. The handle 3 has a pair of projections 10 and 11 fitted into a pair of holes 8 and 9 formed on the inner surfaces 5a and 6a of the pair of exterior members 5 and 6 respectively.
Are formed.

As shown in FIGS. 1 and 2, the pair of exterior members 5 and 6 constitute the grip portion 29 by being assembled so as to cover the handle 3 from above and below. Is injection molded. As the transparent synthetic resin, for example, it is preferable to use PET resin, AS resin, and polymethyl methacrylate (PMMA) resin.

In a state in which the protrusions 10.11 are fitted into the holes 8, 9 and the exterior members 5, 6 are assembled to the handle 3, as shown in FIG. A predetermined gap 1 is provided between the handle 3 and each of the exterior members 5 and 6.
4 and 15 are respectively formed. In the figures, 16, 17
Is a groove into which a part of the neck 2 of the handle 4 is fitted.

When the exterior members 5 and 6 are assembled to the handle 3, as shown in FIGS. 1 and 3, their facing surfaces are formed around the outer periphery of the handle 3. Form a constant gap without contacting each other. This gap is formed so as to surround the outer peripheral edge of the handle 3. The gap is filled with a resin 18 for integrating the handle 4 with the pair of exterior members 5 and 6. After assembling the exterior members 5 and 6 on the handle 3, the resin 18 is placed in a mold and insert-molded to fill the gap.
The resin 18 is filled in the outer peripheral edge of the handle 3 and the connection with the neck 2, but is not filled in the gaps 14 and 15.

The grip portion 29 has a void formed by utilizing the difference between the refractive index of the resin used for the exterior members 5 and 6 and the refractive index of the gas in the voids 14 and 15. Therefore, the exterior members 5 and 6 and the voids 14 and 1
5, the reflection efficiency of light at the interface with the substrate 5 can be increased. As a result, the appearance of the grip portion 29 is transparent,
In addition, the glossiness can be improved. In addition, since the surface condition when the handle 3 is formed is maintained, in addition to the reflection of the inner surfaces 5a and 6a of the exterior member 5, light is reflected on the surface of the handle 3 as well. Good glossiness can be obtained.

The resin 18 is used to mold the handle 4 in order to improve the adhesiveness and glossiness of the handle 3.
It is preferable to use the same resin as the primary molding resin such as P resin and AS resin for molding the exterior members 5 and 6.

The handle 1 of the toothbrush of the first embodiment configured as described above has a handle 3 made of a synthetic resin containing a color pigment and a pair of exterior members 5 made of a transparent synthetic resin.
6, the grips 29 are glossy without being affected by the surface properties of the handle 3. Therefore, according to the toothbrush handle of the first embodiment, a satisfactory glossiness can be obtained. With this transparent synthetic resin, the color of the handle 3 can be confirmed, the surface gloss of the handle 3 and the inner surface 5 of the exterior members 5 and 6 can be confirmed.
Any translucent resin can be used as long as it is a resin that gives a glossiness of 6a.

As shown in FIGS. 4 and 5, when a plurality of mountain-cut irregularities 21 are formed on the inner surfaces 5a and 6a of the exterior members 5 and 6, the reflection is greater than when the inner surfaces 5a and 6a are flat. The efficiency is enhanced, and the glossiness of the grip portion 29 becomes more excellent.

Next, a method of manufacturing the toothbrush of the first embodiment will be described. First, a primary molded body is formed. That is, the handle 4 and the pair of exterior members 5 and 6 are formed by injection molding using separate molds. Next, the pair of exterior members 5 and 6 are attached to the handle 3 of the handle 4. Then, the handle 4 to which the exterior members 5 and 6 are assembled is disposed on the dies 19 and 20 as shown in FIG.

The cavity 18 is filled with a resin 18 and integrally molded. When the resin 18 is solidified, the mold 1
9 and 20, the molded product is taken out, and a hair bundle is implanted in each of the implanted holes (not shown). Thus, a toothbrush having a glossy grip portion 29 shown in FIG. 1 is obtained.

[Embodiment 2] The handle 1 of the toothbrush according to Embodiment 2 is a case having an insertion hole into which the handle 3 is inserted as an exterior body. In the second embodiment, only the portions different from the handle of the toothbrush of the first embodiment will be described, and the description of the same portions as the first embodiment will be omitted.

The handle 4 according to the second embodiment is similar to the handle 4 shown in FIG.
As shown in FIG. 7, a flange 22 is provided at a portion where the neck 2 and the handle 3 are continuously provided, and a protrusion 23 is provided at a rear end of the handle 3. On the other hand, the exterior body 24 is formed as a rectangular case having an insertion hole 25 into which the handle 3 is inserted.

As shown in FIGS. 7 and 8, a concave portion 26 for fitting the flange portion 22 is formed at the open end of the exterior body 24. In a state where the flange portion 22 is fitted into the recess portion 26, the flange portion 22
Are not projected from the opening end face 24a of the exterior body 24. At the bottom of the insertion hole 25 of the exterior body 24, a positioning recess 27 into which the projection 23 of the handle 4 is fitted is formed.

The projection 23 is fitted into the positioning recess 27 and the flange 22 is fitted into the recess 26.
And the handle 3 of the handle 4 is
In the state where the handle 4 is assembled, a gap 28 is formed around the outer periphery of the handle 3 as shown in FIG. The gap 28 is formed in the handle 3 inserted into the insertion hole 25.
It covers substantially the entire area except for the convex portion 23 fitted into the positioning concave portion 27.

The handle 4 and the exterior body 24
Is integrated by the resin 18 formed at the opening end of the exterior body 24. In the handle of the toothbrush configured as described above, similarly to the toothbrush of the first embodiment, since the gap portion 28 is provided between the handle portion 3 and the exterior body 24, the surface of the handle portion 3 is formed. The grip portion 29 becomes glossy without being affected by the properties, and a satisfactory glossiness can be obtained.

Next, a method of manufacturing the toothbrush according to the second embodiment will be described. First, the handle 4 as a primary molded body and the exterior body 24 are formed by injection molding using separate molds. Next, the handle 3 of the handle 4 is inserted into the insertion hole 25 of the exterior body 24, and the handle 3 is inserted.
The exterior body 24 is assembled. Then, the exterior body 24
As shown in FIG. 8, the handle 4 with the
9 and 20.

Then, a resin 18 is filled in the cavity. When the resin 18 has hardened, the molds 19 and 20 are opened to take out a molded product, and a hair bundle is implanted in each of the implanted holes. As a result, the glossy grip portion 29 shown in FIG.
Is obtained.

In the above-described embodiment, the present invention is applied to a method for manufacturing a handle of a toothbrush. In addition, the present invention is applied to a method for manufacturing a handle, a spoon, a fork, etc. of a cleaning tool such as a hairbrush, shoe brush or mop. Even if applied, the same effect is obtained. Further, the present invention is not limited to a brush, but may be applied to any device having a grip 29. In particular, in the case of a handle used around water such as a toothbrush, the outer body 5 is provided around the outer periphery of the handle.
The gaps 14, 15, 28 formed by the resin 6, 24, and the resin 18, if no gap is formed between the exterior bodies 5, 6, 24, and the resin 18, water will come from the outside of the grip portion 29. It does not enter the parts 14, 15, 28. As a result, no mold is generated in the gaps 14, 15, and 28, so that the glossiness of the grip 29 is not impaired. In the above-described embodiment, if the handle 3 of the handle 4 is formed with a three-dimensional design such as an animal or a building, the handle 3 has a glossy feeling and does not impair ease of grip.
In addition, it is possible to provide a grip having design.

[0028]

As is apparent from the above description, since the handle of the present invention has a gap between the handle and the outer casing, it is affected by the surface properties of the handle. Without
The grip becomes glossy, and a satisfactory gloss is obtained.

[Brief description of the drawings]

FIG. 1 is a perspective view of a handle of a toothbrush according to a first embodiment.

FIG. 2 is an exploded perspective view of a handle of the toothbrush according to the first embodiment.

FIG. 3 is a cross-sectional view showing a toothbrush according to the first embodiment in which a handle and an exterior body are arranged in a mold, insert-molded, and integrated.

FIG. 4 is an enlarged perspective view of a main part of an exterior member having a plurality of irregularities formed on an inner surface.

FIG. 5 is a sectional view of a handle of a toothbrush formed by assembling an exterior member having a plurality of irregularities on an inner surface to a handle.

FIG. 6 is a perspective view of a handle of the toothbrush according to the second embodiment.

FIG. 7 is an exploded perspective view of a handle of the toothbrush according to the second embodiment.

FIG. 8 is a cross-sectional view illustrating a toothbrush according to a second embodiment in which a handle and an exterior body are arranged in a mold, insert-molded, and integrated.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 handle 2 neck part 3 handle part 4 handle 5,6,24 exterior body (exterior member) 8,9 hole part 10,11 protrusion 18 resin 29 grip part

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Kazuko Isoya 2-3-1 Bunka, Sumida-ku, Tokyo Kao Co., Ltd. F-term in the Research Institute of Kabushiki Kaisha 3B202 AA06 AA11 AA21 AB01 AB19 CA06

Claims (5)

[Claims] 1. A handle having a handle formed of a synthetic resin containing a color pigment, and an exterior body formed of a transparent synthetic resin and provided to cover the handle. A handle formed by insert-molding the handle and the exterior body and being integrated, wherein a gap is formed between the grip handle portion and the exterior body. 2. The exterior body comprises a pair of exterior members which cover the handlebar portion from above and below, and a hole for fitting a projection formed on the handlebar portion to an inner surface of each of the pair of exterior members. The handle according to claim 1, comprising: 3. The handle according to claim 1, wherein the exterior body comprises a case having an insertion hole into which the handle is inserted. 4. A toothbrush having a handle according to claim 1. 5. An exterior body which is formed by molding a handle having a handle portion with a synthetic resin containing a coloring pigment and covering the handle portion with a void around the handle portion. A method of manufacturing a handle, wherein the handle is molded integrally with the handle, and the handle is assembled to the handle by insert molding.