Wet method or solution pulverization method Generally, the particle size of rubber powder produced by normal temperature pulverization method is 50 mesh; the particle size of rubber powder produced by low temperature pulverization method is 50 ~ 200 mesh. The size of rubber powder produced by wet method or liquid method is 200 days to L. The application fields of rubber powder produced by different methods are different, but they are still widely used in normal temperature pulverization method. The most representative production of rubber powder by wet or solution pulverization is the new process for producing rubber powder developed by the British Rubber and Plastic Research Association (NAPRA) called RAI'RA. The waste recycling company divides the law into three steps. The first step is to crush the used rubber. The second step is to pre-treat the chemical powder or water to the coarse rubber powder. The third step is to put the pre-treated rubber powder into the round. The disc colloid mill is pulverized into ultrafine rubber powder. In addition, some new solution methods have been developed in recent years.
2. 2. 3. 1 British wet or dope pulverization method Waste II rubber wet or solution method (RAPRA method) developed by British Rubber and Plastics Research Association, obtained by the United States Gould company patent implementation rights and established production in Ohio, USA factory.
The ultra-fine rubber powder having a particle diameter of 0.001 to 0. 020 mm can be obtained by using the RAPRA method, and can be used alone or in combination with a new rubber compound, and is used in high-grade rubber products, paints and the like.
The RAPRA method can be divided into three methods, but the cats 1-11 are pulverized by a disc type colloid mill as shown in Fig. 2-21.
In Fig. 2-22, A is 1 stator, B is the lower rotor, C is the top steel plate fixed A, the size of the feed port E is adjusted by adjusting the screw D, F is the hopper, the mountain is supplied to the grinder The scrap material enters the feeding hole of the grinder through the safety screen G. H is a rotator, applying the centrifugal force generated by H, and the rubber pieces are sent to the grinding chamber between the two grinding discs for grinding and pulverization.
The application of this method in Hong Kong waste recycling has two characteristics: one is to maintain a lower temperature during the pulverization process, because the physical and mechanical properties of natural rubber and synthetic rubber will have a high temperature of 100 ° C. In a certain degree of decline, therefore, in the RAPRA method, the temperature should be strictly controlled below 100 ° C; the second is that the rubber powder pulverized by the disc grinder has a concave-convex surface and a burr state. The particles of the rubber powder have a large surface area under the same volume as the particles of the rubber powder produced by other methods, so that the rubber compound with the rubber powder has a stronger reinforcing effect. In addition, this powder is easy to automate and automatically weigh.
Ground Screw is consist of drill bit and drill pipe and once it is anchored in the ground, it can not take out and it will be used as one fixed pile. There are four types of ground screw piles we exported: ground screw with nuts, ground screw with flange, ground screw with U shape and helical ground screw piles. These four types of ground screw are more popular with our customers and we can make other types of Ground Screw Pile according to your requirements or your drawings because different countries have different types of ground Screw Pile. So, you can let us know your needs and then we will supply more information to you.
Ground Screw
Ground Screw,N Ground Screw,F Ground Screw,U Ground Screw
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