Coarse ore crushing mill Crusher - Wikipedia, the free encyclopedia A crusher is a machine designed to reduce large rocks into smaller rocks, gravel . handling coarse materials, and tertiary and quaternary crushers reducing ore.Thermoplastic Fine Powder Mill. Thermoplastic Fine Powder Mill is mainly applied to the polyethylene, polyvinyl chloride, polypropylene. Nylon thermoplastic plastic crushing processing use. Roller Mill. Roller Mill called CGM1000 roller mill is a dry grinding classing mill which can reach 3～35um fine particle size.