The performance parameters of sponge in rubber sleeve mainly include thickness, hardness and elasticity. After changing the big ball, the positive rubber is usually equipped with 2.0-2.2 mm and 35-40 degree sponges, the reverse rubber is usually equipped with 2. 1-2.3 mm and 40-50 degree sponges, and the raw rubber is usually equipped with 0.8- 1.8 mm and 40-45 degree sponges. Long rubber is usually equipped with a thin sponge below 0.8mm or without a sponge.
At present, in the table tennis equipment market, manufacturers all use a hardness tester with a spherical probe to measure the hardness of the sponge, while Shuangxi sponge keeps the habit of the rubber industry and uses a pointed hardness tester, so the measured hardness is called Shore hardness. A nominal sponge with the same Shore hardness is harder than a sponge with ordinary hardness.
Extended data:
There are two ways to mark the hardness of table tennis sponge in China, namely, the Shanghai Shore needle ruler represented by Double Happiness, also called Shore A ruler, and the Tianjin Fahrenheit ball ruler represented by "729", also called Shore C ruler.
Shaw W uses a hardness needle with a diameter of 5mm when measuring hardness. Therefore, compared with products with uneven hardness, the testing sponge has a wide force range and high accuracy.
The diameter of the cone end of Shore A hardness tester is only 0.8mm, and the stress surface is small, so it needs many accurate tests. Select multiple points on the product to test and get the average value. Under the same hardness, its logo is about 5 degrees lower than Shaw's.
Under the condition of the same hardness of table tennis bat, the greater the thickness of sponge, the greater the strength and the faster the speed, the higher the efficiency of manufacturing rotation and the lower the controllability. With the same thickness, the greater the hardness and the faster the speed, the lower the efficiency and controllability of manufacturing rotation, and vice versa.
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