... alloy steel,Hardness more than 52 The new product FD series “double vertical ring-die pellet mill”, Research,Design,Produced by ... ,Bamboo and Palm fiber etc.Advantage:Gearbox:Continue the SKJ series New generation gearbox,Driving with high-precision gears,Auto-matic ... ,Produced more capacity,At the same time assure hardness and density,The special design is 4 rollers working,Increase press rate ...