JP2000308524A - Tooth brush having rod-like projections and its production - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tooth brush having rod-like projections which are flashless, have excellent appearance and are hardly deteriorated and assure excellent safety. SOLUTION: This tooth brush has molded rod-like projections formed by a liquid type silicone rubber injection molding system of liquid type silicone rubber essentially consisting of oily linear siloxane polymer on a flocking base 10. In such a case, the rod-like projections are formed by the liquid type silicone rubber injection molding system and are the built into the flocking base 10.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a toothbrush having rod-like projections and a method for manufacturing the same.

[0002]

2. Description of the Related Art Toothbrushes having rod-shaped projections are already available on the market as toothbrushes that can provide a massage effect on gums. Conventionally, such rod-shaped projections are generally formed by a compression molding method using a millable silicone rubber containing a linear siloxane polymer having a degree of polymerization of about 5,000 to 10,000 as a main component. However, there is a problem that burrs are easily generated on the obtained rod-shaped projections for the toothbrush, the appearance is easily spoiled, and the vulcanizing agent is easily left in the silicone rubber even after the molding, resulting in deterioration. Was. In addition, as a result of the necessity of the mastication step, foreign matter is easily mixed therein, which is difficult in terms of safety. In addition, it takes a long time to cure (usually 10 to 20 minutes), so that low productivity is also a major problem. Had become.

[0003]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional problems, and provides a toothbrush having bar-like projections which are excellent in appearance without burrs, are hardly deteriorated, and are excellent in safety, and the efficiency of the toothbrush is improved. It is intended to provide a method that can be manufactured well.

[0004]

According to the present invention, there is provided a toothbrush having a rod-shaped projection formed on a flocking table by a liquid silicone rubber injection molding system of a liquid silicone rubber containing an oily linear siloxane polymer as a main component. It has been achieved.

Further, the present invention uses a liquid type silicone rubber mainly composed of an oily linear siloxane polymer as a material, forms a rod-shaped projection by a liquid silicone rubber injection molding system, and then incorporates the rod-shaped projection into a flocking table. The object has been achieved by a method for manufacturing a toothbrush characterized by the above-mentioned.

Here, the liquid silicone rubber injection molding system (Liquid Injection Molding System) comprises a liquid type silicone rubber, for example, an injection unit provided with a metering injection pump unit and a mixing device such as a dynamic mixer or a static mixer. A molding processing system that automatically injects everything from mixing to molding after being automatically injected into a molding machine, and is generally called LIMS.

As the linear siloxane polymer used in the present invention, those having a degree of polymerization of about 100 to 2,000 are particularly advantageous for achieving the object of the present invention.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to FIGS.
3 will be described.

Numeral 10 designates a flocking table which is formed at the tip of the handle portion 11, and has bar-shaped projections 20 for gumming, which are appropriately planted on opposing longitudinal edges 10b of the flocking surface 10a.

As shown in FIG. 3A, the rod-shaped projections 20 are connected on both the flocking surface side and the back side of the flocking table 10, or as shown in FIG. The base 20 may be integrated into the flocking table 10 as shown in FIG. 2, but only on the back surface 10c side of the flocking table 10 as shown in FIG.
a are connected to each other via a connecting member 21.
It is more preferable because it is possible to prevent the rod-shaped projections 20 from falling off, and also to expose the flocked surface 10a of the flocking table 10 between the rod-shaped projections 20 so that the brush bundle can be transplanted between the rod-shaped projections 20.

The rod-like projections 20 have a degree of polymerization of 100 to 2,
It is formed by a liquid silicone rubber injection molding system using a liquid silicone rubber containing about 000 linear siloxane polymer (oil) as a main component, and its specific shape is not limited. By the way, FIG.
In the example, the connecting member 21 is also integrally formed of the same material and the same system.

Numeral 30 denotes a brush bundle, which is appropriately planted on the flocked surface 10a including the space between the rod-shaped projections 20. still,
The material of the brush bundle 30 may be natural hair or artificial hair such as nylon or polybutylene terephthalate.

The toothbrush has a degree of polymerization of 100.
Approximately 2,000 linear siloxane polymer (oil-like) is used as a material, and a liquid silicone rubber is used as a material. The liquid silicone rubber injection molding system is used to form a rod-shaped projection 20 (in FIG. 2, the connecting member in the example). 21) and then allowed to cure for 0.5 to 5 minutes, and then incorporated into the flocking table 10 so as to protrude above the flocking table surface 10a to produce a very efficient production. You. The rod-shaped projections 20 may be incorporated into the flocking table 10 regardless of whether the brush bundle 30 is implanted into the flocking table 10.

[0014]

According to the toothbrush of the present invention, since the rod-shaped projections are formed by the liquid silicone rubber injection molding system at a lower injection pressure than the compression molding method, the appearance is excellent without burrs and a vulcanizing agent is required. Therefore, there is no risk of deterioration due to the vulcanizing agent or reaction by-product. In addition, since a mastication step is not required, there is no possibility that foreign matter is mixed, and the safety is further improved.

Further, according to the method of the present invention, since the time required for curing is shorter than that of the compression molding method, the productivity is naturally high, and the toothbrush of the present invention as described above can be produced extremely efficiently.

[Brief description of the drawings]

FIG. 1 is a schematic plan view illustrating a flocking base of a toothbrush according to the present invention.

FIG. 2 is an explanatory cross-sectional view of a main part of a flocking base of the toothbrush of the present invention.

FIGS. 3 (1) and (2) are cross-sectional views of main parts showing another embodiment of the toothbrush of the present invention.

[Explanation of symbols]

 10: flocking table 10a: flocking surface 10b: longitudinal edge 10c: back surface 11: handle portion 20: rubber-like bar-shaped brush 20a: base 20b: brush portion 21: connecting member 30: brush bundle

Claims (4)

[Claims] 1. A toothbrush having a rod-shaped projection formed on a flocking table by a liquid silicone rubber injection molding system of a liquid silicone rubber containing an oily linear siloxane polymer as a main component. 2. The linear siloxane polymer having a degree of polymerization of 10
The toothbrush according to claim 1, wherein the number is from 0 to 2,000. 3. A rod-shaped projection is formed by a liquid silicone rubber injection molding system using a liquid type silicone rubber containing an oily linear siloxane polymer as a main component, and the rod-like projection is then incorporated into a flocking table. The method for manufacturing a toothbrush according to claim 1. 4. The linear siloxane polymer having a degree of polymerization of 10
The method for producing a toothbrush according to claim 3, wherein the number is from 0 to 2,000.