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Title:waste tyre recycling processes
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waste tyre recycling processes

    Nearly all processors begin by shredding the tire. This primary reduction step reduces the volume of tires and creates a material that is more easily handled. Tire shredders typically are shear shredders with two counter rotating shafts producing 2-inch shreds. The shredding divsion fulfils this function for Western Rubber.

    The shred is further reduced using either an ambient or cryogenic system. In an ambient system (like that used by the crumbing plant) the shred, at ambient temperature, is fed into one or more granulators fitted with screens that determine the size of the output. Steel is removed from the resulting material by magnets and fiber is removed by aspiration and sifting so that only rubber particles remain. If larger sized rubber particles (typically  inch or larger) are desired the process may end here. More often, smaller sizes are required in which case the rubber is processed through one or more cracker mills. (The fine Grind Division operates two of these mills.) These mills have two counter rotating corrugated rolls placed very close together that “crack” the rubber into smaller particles as it passes through. The ambient system is effective where the targeted output size is 30 mesh or greater.

     In a cryogenic system the tire shreds, or in some cases the whole tire, is super-cooled using liquid nitrogen. The cold rubber, now extremely brittle, is processed through a hammer mill which shatters the rubber into smaller particles. The output is dried and classified into specific gradations. Smaller particles can be produced with the cryogenic process than with an ambient system. It requires fewer pieces of equipment than the ambient system and energy and maintenance costs may be less. A drawback of the cryogenic process is the cost of liquid nitrogen. Cryogenic crumb rubber particles have very smooth surfaces compared to crumb produced ambiently. Most crumb rubber customers require particles that are rougher with greater surface area therefore cryogenic material has limited applications.

       (A) room temperature grinding method (Rubber Processing Machinery): powder particle size of 10-40 head of production. Large size of the product, mechanical and physical properties affected by the heat, use only as a filler.
     (B) low temperature grinding method(Rubber Processing Machinery): : powder particle size of 50-120 head of production. The product size is small, but the smooth surface, less cohesion in the application, high investment and high cost.
     (C) ultra-fine powder Method(Rubber Processing Machinery): : Production powder particle size of 200 head or more. The product size is small, effective reinforcement in the rubber compound, but low yield and high cost, difficult to form an industrial production.

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