... departments of the national economy, such as building materials, metallurgy, chemical industry, electric power, coal, machinery, light industry, food and ... granular, small block of material, such as cement, coal, grain, chemical fertilizer, ash, sand, coke, etc, not transport perishable, Viscous, ... life. 5 small size, high speed, rapid and uniform conveyor. 6 ISO9001:2000certificate spiral conveyor