What are the main raw materials of table tennis and what are the differences between table tennis ma

More than 80% of the table tennis bottom plates we use now are radial cut plates (straight grain); The yield of the chord cut plate (mountain grain) is relatively high, and the yield of the radial cut plate is very low, which is one of the reasons why the cost of the bottom plate remains high. The comfort of using the table tennis base plate is related to the following factors related to wood:

1. Texture: The texture of veneer (veneer) is mainly caused by different slicing methods, two methods: diameter cutting and chord cutting, the so-called radial cutting and chord cutting is to see whether its wide board surface is perpendicular to the diameter of the log. For example, the diameter of the wide board surface and the log is "parallel", which is the radial cut board.

For example, the width of the plate is "perpendicular" to the diameter, which is the chord cutting plate. The textures that appear after slicing are: straight grain and mountain grain, and the texture we see is the direction of the growth rings.

2. Material properties: select according to your favorite tree species, texture and color, and focus on tree species with stable material properties. Be careful not to have color differences, knots, mineral lines, etc.

3. Moisture content: the key to ensuring quality should refer to the national standard, and the moisture content of the purchased bottom plate must be consistent with the local equilibrium moisture content to ensure that it is not deformed.

4. Processing accuracy: use the hand mold eye to see whether the sample panel and the laminate are smooth and flat, and whether the appearance is smooth.

Cork] Cork: The outer skin of the cork oak tree, which should belong to the accessory product of wood, is a precious renewable green resource, mainly grown in the Mediterranean coastal region, with a global annual production of only about 350,000 tons, of which Portugal accounts for about 50, and the best quality. Unlike hardwoods and other wood materials, softwood contains almost no wood fibers, but is made up of countless wood.

It is composed of air-filled cells with peculiar physical and chemical properties (about 40 million per cubic centimeter). Cork has unrivalled excellent properties: non-toxic, mellow, non-mildew, non-rotten, non-insect-prone, elastic, insulating, water-resistant, wear-resistant.

Acid and alkali resistant, flame retardant, excellent sound insulation, sound absorption, vibration isolation, vibration absorption effect. The thermal conductivity of cork is very low, its own temperature is constant at about 23 degrees, therefore, cork is an excellent thermal insulation, thermal insulation material, due to the above characteristics and its very high physical and chemical stability, its service life greatly exceeds other wood materials. In addition to natural cork, there is also composite soft.

Wood: that is, the higher grade and more moderate cork particles are screened out and processed into a certain density of blanks. Cork is generally used as the handle of the bat.

Now and the official competition is used in a flammable plastic called celluloid, and now Double Happiness and Pisces have developed a seamless table tennis ball, which is made of denatured polymer material. However, it has not yet been used in the official competition, at least it is not currently sold on the market.

It is celluloid plastic, a plastic that pollutes and harms the environment.

The texture is different. Some are made of polymer materials, which are relatively easy to break. Some are made of nitrocellulose material, which is relatively heavier.

The materials used to make table tennis balls are different, the way of making them is different, the process of making them is different, the pressure that table tennis balls can be subjected to is different, and the elasticity of table tennis balls is different.

Different weights, different diameters, different production regulations, different waterproof effects, different materials used, and different use effects.

There will be different production ingredients, including different cellulose, will also have different use effects, different lengths of use, will also have different characteristics, and different water resistance.

Ping pong. What material is it made of? How is this material produced and processed into table tennis balls?

The standard table tennis ball is made of a type called celluloid.

made of materials. Celluloid is flammable and has certain requirements for storage. A celluloid sheet is a resilient, lightweight, translucent object, and its main component is nitrocellulose.

According to the regulations of the International Table Tennis Federation, the table tennis balls used in the competition mainly have two colors: orange and white, and the combination of the use of table tennis balls and the table of these two colors is not restricted and can be freely combined. In recent years, most of the international and domestic competitions have used white balls.

1. The material of table tennis was originally made of a synthetic fiber plastic (nitrocellulose plastic), also known as celluloid, and the new regulations began to use polymer as a raw material for new plastic balls on July 1, 14, and the raw materials were made into sheets with a diameter of 44 mm and a thickness of millimeters in the material factory, and a solution was configured according to 40% alcohol and 60% water, and the plastic sheets were put into it, and the softening process was softened so that it could be evenly formed.

2. After soaking the sheet, the solution on the surface should be rinsed off with clean water, and the moisture on the surface should be dried, first of all, the plastic sheet needs to be made into a hemispherical shape with a metal mold, and the sheet is fixed on the mold, through pressurization, while immersing it in hot water of more than 90 degrees, the sheet will be more malleable after being soaked in the solution and hot water, and the pressure in the mold will make the sheet slowly become hemispherical.

3. To cut all the burrs of the hemisphere edge through the machine, the thickness of each hemisphere should be measured, the hemispheres of different thicknesses should be classified, the thickness difference between each group is only millimeters, and the hemispheres with similar thickness of each group will be glued together after screening, and one hemisphere will be placed in the mold to make the edge shrinkage smaller after heating, and the other hemisphere will be covered on the reduced hemisphere, and the glue will flow to the hemisphere interface with the gap, and the hemisphere will be squeezed the hemisphere through the machine. The two hemispheres will be completely glued together to form a round ping pong ball.

4. Put the table tennis ball into the metal mold, there will be many small holes on the surface of the mold, put it into the oven at 380 degrees, let the air in the ball expand, so that the seam is tighter and smoother, in order to clean off the glue on the surface of the table tennis ball, make the seam smoother and reach the required weight, put the table tennis ball into the polishing machine for polishing.

5. Detect whether the seams are intact and uniform by lighting, and weigh and rotate the table tennis balls, and grade them, with high quality for the game and low quality for training. Finally, the brand and grade are printed on the graded table tennis balls, so that the table tennis balls are manufactured.