What is the historical evolution of glue for table tennis racket?

Table tennis etiquette Table tennis is a very delicate sport.

During the competition, athletes' psychology and spirit are in a highly concentrated state, so athletes need to carefully observe the movement, time, position, racket shape, ball-coming operation and opponent's expression when hitting the ball with their eyes. Listen to the sound of the opponent's racket hitting the ball with your ears, so as to judge the rotation, speed, strength, landing point and rhythm of the ball, as well as the opponent's psychological state and possible tactics, and consider how to return the ball.

Athletes' correct judgment of these situations and threatening to return the ball not only depend on their own ability, but also need a good competition environment.

Therefore, when watching the table tennis match, we should pay attention to the following points: (1) During the period from the time when the athletes are ready to serve to the time when the ball becomes a dead ball, the whole stadium should be quiet, and clapping, stamping the floor, making loud noises, cheering, walking around at will, displaying flags and slogans are not allowed.

(2) Don't take photos with a flash.

Flash has a great influence on the table tennis match, because the collision between the table tennis bat and the ball is completed in an instant, and the flash will flash across the athletes' eyes, making them unable to judge the quality of the incoming ball, thus affecting the quality and hit rate of the return ball.

(3) Come on softly, and don't bring gongs, drums and horns into the gymnasium, because loud voices and excessive language will affect the mood and attention of athletes.

Don't boo which side lost, or it will put pressure on the players, which is not good.

And don't boo the referee.

(4) Smoking is prohibited in the venue; The phone is turned off or set to vibrate or mute.

[Edit this paragraph] Table tennis "small ball" has been reformed into "big ball"

In the early 1980s, after the China team won seven championships in the 36th World Table Tennis Championships, some people put forward the suggestion of increasing table tennis and nets, but this suggestion didn't get people's attention.

Since then, the technology of table tennis has been developing continuously, and the ball speed is getting faster and faster, and the rotation is getting stronger and stronger.

Many athletes have fewer rounds against each other; Sometimes the ball flies like lightning before the audience can see it clearly, and the outcome has been decided, which weakens the interest of table tennis fans.

Therefore, Ichiro Okimura, former president of ITTF, once considered increasing table tennis events.

As the president of ITTF, Xu Yinsheng put this matter on the agenda.

1in may, 1996, ITTF parliament agreed to the proposal of testing big balls-in order to slow down the speed and rotation of the ball and increase the roundness and appreciation, it is suggested to increase the diameter of table tennis by two millimeters.

ITTF is going to do an experiment in the youth championship in Japan next year, but Japanese manufacturers gave up because of too much opinion.

At that time, I just suggested changing a big ball. In order to produce big balls, manufacturers need to invest money to remake molds and adjust the process. If the proposal is finally rejected, the money will be wasted.

In order to support the reform of table tennis, Shanghai Double Happiness Table Tennis Group resolutely undertook the trial-production task, and produced a number of high-quality big balls as required, which were sent to member associations for trial use by ITTF.

The only table tennis association in the world that has instruments to measure the speed and rotation of dynamic table tennis has taken the initiative to undertake the testing work.

Researchers from the Scientific Committee of the Chinese Table Tennis Association made an experiment on the influence of table tennis with different diameters and weights on hitting speed and rotation.

The experimental conclusions are as follows: the ball with large diameter is slower than the ball with small diameter, and the rotation is weaker than the ball with small diameter; For balls with the same diameter, a ball with large weight and elasticity is faster and more powerful than a ball with small weight and elasticity.

1997 During the 44th World Table Tennis Championships, the first big ball test was conducted, but it had little impact.

1In the spring of 998, the Suzhou International Table Tennis "Big Ball" competition proposed by Xu Yinsheng was tested for the second time.

The Chinese Table Tennis Association took the initiative to bear the funds for the Suzhou Experimental Tournament.

1999, another international competition was held in Copenhagen, Denmark, using big balls.

1999 At the ITTF Congress held during the 45th World Table Tennis Championships in Dawei, the proposal of "Big Ball Reform" was shelved because it did not get a three-quarters majority. Of the members of 124, 84 voted for it, 30 opposed it, and 10 abstained.

Shalala, then the new president of ITTF, said that some delegates abstained or voted against the reform because they didn't understand the impact of the reform, and he would explain and convince them.

On February 23rd, 2000, ITTF Special Congress and Congress adopted the reform plan of 40mm big ball in Kuala Lumpur, and decided to start with 65438+ 10/in June, 2000, that is, after the Sydney Olympic Games, the big ball with a diameter of 40mm and a weight of 2. The table tennis match will use 7g instead of 38mm balls.

In addition, the table tennis reform also includes "replacing' 21'with'1'"and "open serve".

From September 1 2008, the "glue ban order" was officially implemented and inorganic glue was used instead.

Solvent glue with volatiles is usually called organic glue or dry glue. Its main components are viscous colloid and organic solvent. The latter refers to a chemical solvent with low toxicity and poor volatility, which can dissolve adhesive colloid and contain toxic components such as toluene and xylene. ITTF has certain restrictions on toxic components in glue.

Organic glue can increase the elasticity of sponge and improve the hitting speed. Every athlete needs to brush his racket with glue several times before the competition, which is also regarded as an indispensable weapon in table tennis.

Inorganic glue is colorless and tasteless, and its dilution is similar to that of water, which will not increase the elasticity of sponge. It only needs to be brushed once, and the bottom plate of this glue is easy to clean without leaving any residue.

Five basic elements of table tennis The five basic elements of table tennis technology are: arc, strength, speed, rotation and landing point.

Arc is the trajectory of table tennis flying in the air.

Power acts on the ball, which is manifested in the forward speed and rotation intensity of the ball.

If you smash hard in the middle of the attack, so that the other side can't catch well, then you must play with your strength.

If you are strengthening the spin, whether it is topspin or backspin, then you must rub the ball hard.

In order to minimize the opponent's preparation time, you must seize the time and try to return the ball to the opponent's face in the shortest and fastest time, so that the opponent is caught off guard. This is speed.

In order to increase the difficulty of the opponent's counterattack, you can also make various spinning balls to force the opponent to "get a chance" after returning the ball. This is rotation.

Table tennis is not big. To make your ball more powerful, you must mobilize your opponent to move or run back and forth.

So pay attention to placement.

Therefore, arc, strength, speed, rotation and landing point are the basic elements of table tennis technology.

[Edit this paragraph] The model of table tennis bat is 1. Positive glue sponge bat: Positive glue is rubber with upward rubber particles and the same height and diameter.

Good elasticity, stable hitting and fast speed, suitable for players who are close to the table for fast break.

If you feel that your wrist is flexible, but your arms and waist and abdomen are not strong enough, you'd better choose a rubber racket that wins by speed.

2. Raw rubber sponge swatter: Raw rubber is rubber with upward particles and a diameter greater than the height.

It is characterized by the ball sinking and weak rotation, which is suitable for players near the table.

3. Anti-sticking sponge bat: Anti-sticking is a kind of rubber with rough face down and sticky face up when sticking, which is adopted by players all over Europe.

The spinning power of the anti-glue ball is very strong, so players who mainly play with spinning (such as curling and chopping) must be familiar with this skill.

Of course, reverse glue is easy to spin, easy to eat and difficult to master.

4. Long rubber sponge bat: Generally speaking, rubber with a height exceeding 1.5mm is called long rubber.

The rubber particles of this kind of rubber are soft, slender and have little supporting force.

The ability to actively create rotation is very poor, mainly relying on the strong rotation or strong impulse of the incoming ball to increase the rotation of the returning ball.

Because of the particularity of long glue, it is not conducive to children's mastery and will interfere with the sense of ball, so the state has banned children from using long glue in competitions.

Beginners and low-skilled enthusiasts are also not suitable for long glue!

5. Defensive sponge racket: Generally, the racket is mainly used for cutting the ball, which belongs to the rotating play. Therefore, the backhand is varied.

On the rackets produced in recent years, there are many classified signs such as "attack", "all-around" and "defense" for fans to choose from.

Beginners may wish to use a low-grade racket that is easy to control the ball to correct their movements. After the level is gradually improved and a stable playing style is formed, they may choose the mid-range and high-grade floor with strong pertinence.

Low-end rackets are not necessarily bad to use, whichever one works is good.