KR20000047327A - Method for manufacturing toothbrush having bristle tufts moving up and down - Google Patents

Abstract

PURPOSE: A method is provided to easily manufacture a toothbrush for the user, which makes bristle tufts flexible to adjust their length to the shape of teeth for use. CONSTITUTION: A toothbrush having bristle tufts moving up and down, comprises: a pad(3) which is passage capable of moving bristle; an elastic body(6) having elasticity for bristle; an injection mold(12) which blocks the inner part from the outside.

Description

Manufacturing process of toothbrush which the bristle moves freely up and down

According to the present invention, a rubber-like elastic body is inserted into a lower layer of a bristle part where the bristles are fastened in a conventional toothbrush, and the bristles can move, so that the bristle moves freely up and down according to the force and tooth structure applied by the user. It is about.

Recently, as the research on toothbrushes has become full-fledged and diversified, the toothbrush newly introduced to the market has an unusual shape, as shown in FIG. What these toothbrushes pursue is that they can easily clean between teeth and teeth, behind the molar, and the inner side of the tooth (the contact with the tongue), which is not easily reached with conventional flat toothbrushes. Contrary to this tendency, however, the toothbrushes generally recommended by dentists are of the conventional conventional type with the flat shape of the bristles being implanted in the head 4. This is because in the case of a toothbrush having a unique shape because the shape and dimensions of the teeth and other tissues in the oral cavity differ slightly from person to person, a situation that may be inconvenient for a specific person may occur.

Various attempts have been made to solve the problems mentioned above, one of which is that the bristles 1 move up and down depending on the shape of the tooth. The toothbrush is based on the principle that the bristles are pushed into the toothbrush in accordance with the pressure given by the user, and when the pressure is weakened, the toothbrush is returned to its original state by the repulsive force of the elastic body therein. There are several ways to do this. The first method is to use steel springs (7). This method is to first fasten several bristles to the cylindrical plastic piece 10 by fastening a bundle, and then attach a spring of iron to the bottom. Here, the spring acts as an elastic body and the bristles move along the grooves formed in the toothbrush bar, and the jaw exists at the upper end of the groove so that the bristles cannot escape out of the toothbrush bar.

The biggest problem with these toothbrushes is the complexity of the production process. To complete the toothbrush, first tighten the bristles and fix it to the plastic structure 10, then inject each bristle and insert it into the molded toothbrush, then attach a spring to the back of the plastic cylinder and then back the toothbrush 11 Seal to complete the toothbrush. In addition, the bristles are fastened to the plastic cylindrical structure, and the bristles occupy a large volume of the plastic cylinder, which reduces the area for the bristles to settle compared to the head size of the toothbrush and does not completely seal the inside of the toothbrush head. When brushing your teeth, water will get inside your toothbrush, which will also cause hygiene problems.

These toothbrushes have been improved by reducing the production process by inserting an elastomer made of silicone instead of using springs. However, it did not solve the time-consuming process of inserting the bristles and sealing the back of the toothbrush. In addition, the problem remains that the sealing process did not solve the complete blocking of the toothbrush head and exterior.

The purpose of the present invention is to enable the movement of the bristles while solving the complexity of the production process, which is a problem of the existing method, not only can significantly reduce the production time, but also completely blocks the inside and outside of the toothbrush and water flows in. In order to prevent the bristle is to provide a manufacturing process of the toothbrush freely moving up and down.

1 is a side schematic view of an existing toothbrush designed to move bristles freely up and down

2 is a side perspective view of a toothbrush made by the present invention;

Figure 3 is a schematic view of the plane and side of the pad used in the present invention

4 is a schematic side view of a mold and a product in a process of injecting an elastic body;

Figure 5 is a schematic side view of the mold and toothbrush head shape in the process of finally injecting a hard resin

※ Explanation of code about main part of drawing ※

1: brush head 2: bottom of the brush head

3: pad 4: toothbrush tofu

5: tip of molten bristles 6: rubber elastomer

7: spring 8: hole where bristles are inserted

9: mother-in-law 10: plastic pieces

11: Back side of toothbrush 12: External injection

13: bristle fastener 14: outer wall of mold

Figure 2 is a side perspective view of a toothbrush manufactured by the present invention, Figure 3 is a schematic view of the plane and side of the pad used in the present invention, Figure 4 is a schematic side view of the mold and the product in the process of injecting the elastic body, 5 is a schematic side view of a mold and a toothbrush head in a process of finally injecting a hard resin.

The present invention is a pad (3) which is a passage for moving the bristles and bristles, the elastic body (6) that can be resiliently contracted when the force is applied to the bristles again to prevent elasticity, to block the inside of the toothbrush from the outside It consists of an external injection molding 12 which makes it possible.

The first step is to manufacture the pads. The pad has a thin plate-like shape as shown in FIG. 3 and is formed with a number of holes 8 into which the bristles can later be inserted and moved. When the pad is completed is attached to the bottom of the fastening device (13). After the transfer to the bristles to pass through the pad to the bristles by using a fastening device to the bristle and cut to prepare a toothbrush is finished. Thus prepared hair is trimmed by using a continuous process and the shape of the bristles is made, and then the ends of the bristles are placed inside the toothbrush to melt the ends. The end 5 of the molten bristles has a larger cross-sectional area compared to the holes formed in the pad, thereby preventing the bristles from later leaving the toothbrush. Through the steps up to this, the bristles are fastened, and the preparation for the subsequent injection process is completed, and the conventional method is much simpler than inserting and inserting each bristle bundle.

The injection process requires two stages of work. The first step is to form an elastic body.

Elastomers should be made of resins such as rubbers that can be injection molded, and rubbers of appropriate hardness to suit the required size of elasticity. To move the bristle with an amplitude of more than 1 mm when pressed with a force of 500 g, the rubber must be at least 3 mm thick if shore hardness is A 15. After injecting the rubber, a hard resin is injected to form the toothbrush so that the final molding is performed, and at the same time, the lower end 2 of the bristles and the elastic body are sealed. Through this process, the lower part of the bristles and the elastic body can be blocked from the outside, and water can be prevented from flowing in when brushing, which can be used more hygienically.

When the present invention is used, the pad manufacturing process is added compared to the conventional toothbrush manufacturing method, but since the volume is a small part, it is easy to mass-produce through injection molding, so there is no significant effect on the production time, and the process of inserting the pad is an automated process and thus continuous production In this case, there is no effect on production time. Therefore, the difference in production time from the method of manufacturing a toothbrush by the method of manufacturing the toothbrush by transferring and fastening the bristles and then melting the bristles can be shortened. The effect is much higher. Moreover, the production time shortened by this process also provides a great advantage because it can be produced in a continuous process by a conventional injection molding method compared to the conventional method of manufacturing the elastic body separately assembled.

The toothbrush produced by the present invention works on the following principle.

Since there is a little empty space in the pad, the bristles can reciprocate freely, and some elastic bodies may be introduced during the injection of the elastic bodies, but the movement of the bristles is not seriously impeded by the fluidity of the elastic bodies. Accordingly, when the user applies pressure to the bristles when brushing the brush, the bristles have a characteristic of moving downward by the applied pressure, and since the elastic body is present in the lower portion, the bristles can naturally be pushed into the inside of the toothbrush head. At this time, if the pressure applied by the shape of the tooth is released, the bristles can rise again due to the repulsive force of the elastic body, so it functions.

A questionnaire survey was conducted using the toothbrush manufactured through the present invention. At this time, the number of respondents was 50, and a toothbrush having a flat shape of two people manufactured by a conventional method was used as a control toothbrush.

Respondents responded according to the two-choice multiple choice and five-point evaluation method.

Comparative Example 1

Toothbrush which number of the hair bundles is 40 as normal toothbrush for adult

Comparative Example 2

Conventional toothbrush designed to move the brush head up and down. Toothbrush using spring as elastic body. Comparative Example 1 Toothbrush with the same size of head but with 24 hairs

Survey item Example Comparative Example 1 Comparative Example 2 Brush head feels free to move up and down 87.5% - 95% Brushing teeth 3.8 3.2 2.8 Cleaning 4.1 3.5 3.7

According to the survey results, in the case of the toothbrush of the embodiment, most of the users feel that the bristles are moving up and down, as well as the feeling of brushing and cleaning are superior to the general toothbrush of the comparative example. The feeling of bristles moving can be felt better in the toothbrush using the spring of Example 2 as an elastic body. Or low preference.

Therefore, it can be seen that the embodiment of the present invention is an excellent toothbrush showing a superior feeling of use compared to the conventional toothbrush as well as the existing toothbrush designed to move the bristles up and down. In addition, the time required for production is not much different from a general toothbrush, and compared to a toothbrush designed to move the bristles, it can be seen as an excellent toothbrush that has the advantage of requiring much less time.

As described above, the present invention not only significantly shortens the production time but also has the advantage that the brushing specimen does not flow into the interior of the toothbrush component, which is hygienic and maintains the same shape as a conventional toothbrush. This can be done by varying the length of the bristles depending on the shape of the human tooth.

Therefore, it is expected that a toothbrush having a very good sense of brushing and cleaning can be produced, and the plaque removing effect is also excellent.

Claims (2)

After temporarily attaching a separately manufactured pad to the bottom of the bristle fastening device, fasten the bristles while letting the bristles pass through the hole of the fastening device and the pad, melt the bottom of the bristles, and then use a rubber-like elastic body to lower the pads and the bristles. Manufacturing process of the toothbrush freely moving up and down, characterized in that the toothbrush is manufactured by injection molding a hard resin in order to make the shape of the toothbrush rod The method of claim 1, wherein the hardness of the elastic body is less than Shore A 15 and the thickness is 2mm or more.