JPH08229175A - Three-layer soft rubber for ping-pong - Google Patents

Abstract

PURPOSE: To provide an excellent ping-pong tool for sound development of such a sport as ping-pong and for healthy growing of youth people by solving a problem which has occurred because of high content of an org. solvent being toxic to human bodies in an adhesive used when a rubber is adhered on a racket for ping-pong being one of sporting goods. CONSTITUTION: A three-layer structure consisting of a rubber (1), a sponge (2) and a waterproof part (3) is prepd. by performing waterproof processing of the surface of the sponge (2) of a soft rubber for ping-pong. In this case, as the surface of the waterproof part 3 is applied with an adhesive, the sponge 2 does not absorb the adhesive and volatile gas does not penetrate into molecules through air bubble holes.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a soft rubber sponge which is used by being attached to a table tennis racket of an exercise equipment, the surface of which is waterproofed.

[0002]

2. Description of the Related Art Conventionally, rubber used by sticking to a table tennis racket of exercise equipment is a rubber made of only rubber (also referred to as a single rubber) and a rubber rubber (1) shown in FIG. 2 and a sponge (2). ) Was attached to the two-layer soft rubber. Of these, the method of sticking this soft rubber to the racket is to stick the table tennis adhesive on the sponge surface of the rubber and the plate surface of the racket,
As shown in Fig. 3, the rubber sponge surface and racket (5)
Double-sided adhesive sheet (4) made of synthetic resin between the plate surfaces
There is a method of sticking so that it is sandwiched, and the rubber is cut into the shape of the plate surface of the racket with scissors and used in the state of FIG.

[0003]

When these conventional two-layer soft rubbers are attached to the plate surface of the racket by the above-mentioned conventional method, the following problems occur. (B) Since the adhesive applied to the rubber is highly volatile, such as thinner, and contains many organic solvents that are harmful to the human body, table tennis played indoors may affect the human body of athletes and spectators. In addition to being very concerned about the adverse effects, it is often abused outside table tennis competitions such as youth thinner play. (B) When an adhesive containing a large amount of organic solvent is applied to the sponge surface of the rubber, volatile gas enters the sponge molecules through the pores of the sponge, resulting in a thick expansion of the sponge (table tennis. There is a case of a tool manufacturer's laboratory), but the domestic and international rules of table tennis set the upper limit of the thickness of the sponge of the rubber to be used, and when using the rubber of the sponge that is inflated thickly with volatile gas, It may violate the rules. (C) The rubber of the sponge thickly inflated with the volatile gas of the adhesive bounces well and gives a strange speed to the ball hit, so athletes who use this adhesive containing a lot of organic solvents are There was a competition inequity in that it was more likely to give the game an advantage over those who did not use it. (D) The sport of table tennis is a sport that is interesting in rally games in which multiple players hit each other's balls, but an adhesive containing a large amount of organic solvent is used as a rubber sponge. When the athletes who got wet with each other compete in the competition, the struck ball is abnormally fast and the rally is not continued, which reduces the enjoyment of those who compete in table tennis. (E) Also, when using a double-sided adhesive sheet instead of adhesive, the technique of sticking rubber to the racket with the double-sided adhesive sheet requires advanced technology because the sheet tends to wrinkle,
Even when the old rubber used is replaced with a new rubber, the grain of the racket sticks to the adhesive sheet and is easily peeled off, often leaving one expensive racket damaged. As a result, competitors had to buy new rackets each time, which was a great financial burden. (F) At present, there are some people in the Japan Table Tennis Association who ban the use of all adhesives and amend the table tennis rule to use only double-sided adhesive sheets, but this double-sided adhesive sheet is a sponge surface of rubber. Since it can be easily peeled off, it is possible to peel off, apply a harmful adhesive to the sponge, paste the double-sided adhesive sheet on the sponge again, and use it in the competition. Therefore, this measure is completely meaningless. From the above problems, the Japan Table Tennis Association, the International Federation of Table Tennis,
Each table tennis equipment manufacturer was looking for a solution. The present invention has been made to solve such a big problem of the table tennis field and to promote the healthy development of the sport of table tennis.

[0004]

[Means for Solving the Problems] The surface of a sponge (2) of soft rubber for table tennis is waterproofed to form a three-layer structure composed of a rubber rubber (1), a sponge (2) and a waterproofing part (3). .

[0005]

[Function] When attaching the conventional soft rubber to the racket,
Since the surface of the sponge (2) is wet with an adhesive, the present invention wets the surface of the waterproofing part (3) and sticks it.
The sponge does not absorb the adhesive and the amount of adhesive used is small.

[0006]

EXAMPLE A method for providing the waterproofing portion (3) of the present invention will be described below as an example. (A) As a first embodiment of the present invention, a rubber sheet is attached to the surface of the sponge (2) so that it cannot be easily peeled off, thereby waterproofing. (B) As a second embodiment of the present invention, a waterproof or stretchable synthetic resin sheet is attached to the surface of the sponge (2) so that it cannot be easily peeled off. (C) As a third embodiment of the present invention, the surface of the sponge (2) is waterproofed by coating it with a chemical liquid such as a rubber liquid or a synthetic resin liquid. (D) As a fourth embodiment of the present invention, in the manufacturing process of the sponge, waterproofing is performed by closing the bubble holes on the surface of the sponge with heat treatment or chemical treatment. (E) As a fifth embodiment of the present invention, in the sponge manufacturing process, the surface of the sponge is manufactured so as not to be foamed as shown in FIG. The embodiment of the present invention has the structure as described above, and is continued from the conventional rubber rubber and the two-layer soft rubber with a sponge,
It is a new third rubber. Note that, as shown in FIG. 6, the effect is further enhanced by waterproofing both the flat surface and the bottom surface of the sponge (2).

[0007]

INDUSTRIAL APPLICABILITY Hereinafter, the present invention has produced many great effects. (A) Since the adhesive is applied to the surface of the waterproof part (3) instead of the surface of the sponge as in the conventional case, the sponge does not absorb the adhesive and volatile gas enters the molecule through the bubble holes. Since there is no sponge, there is no change in the thickness and properties of the sponge, and there is no problem with rules or unfairness in competition. (B) Many athletes use sponge rubber, which is thick and swelled with an adhesive containing harmful organic solvents, because it bounces well and gives an abnormal speed when hitting.
However, in the rubber structure of the present invention, since the volatile gas of the adhesive does not enter the sponge, the property of the sponge does not change, and as a result, the athlete uses the adhesive harmful to the human body. There is no merit to do. If so, table tennis equipment manufacturers will no longer have to manufacture harmful adhesives, only safe and harmless table tennis adhesives will be manufactured and sold, and problems such as competition problems and youth thinner play will not occur. . (C) If the athletes use only safe and harmless adhesives, it will almost no longer be necessary to use double-sided adhesive sheets that easily damage the racket and rubber, and the economic burden on the athletes will be reduced. Become. Therefore, the present invention is an epoch-making invention in the history of table tennis that can solve the big problem that has plagued the Japan Table Tennis Association and the International Table Tennis Federation for many years.

[Brief description of drawings]

FIG. 1 is a perspective view of the present invention.

FIG. 2 is a perspective view of a conventional soft rubber.

FIG. 3 is an explanatory diagram when a soft rubber is attached to a racket using a double-sided adhesive sheet.

FIG. 4 is a perspective view showing a state of a racket to which a soft rubber is attached.

FIG. 5 is a partially enlarged side view showing the state of the sponge (2) of the fifth embodiment of the present invention.

FIG. 6 is a perspective view showing another embodiment of the present invention.

[Explanation of symbols]

 1 rubber rubber 2 sponge 3 waterproof part 4 double-sided adhesive sheet 5 racket 6 sponge non-foam part

Claims (1)

[Claims] 1. A three-layer soft rubber for table tennis in which the surface of a sponge (2) attached to a rubber rubber (1) is waterproofed and a waterproofed portion (3) is provided.