SCR series of closed loop drying machine for continuous crystallization of the amorphous phase of crystalline material, will not phase of the crystallization of PET raw materials or recycled materials can be directly into the crystallization of desiccant materials, can significantly reduce purchasing costs. The system includes a heating device, thermal insulation barrel and mixing components. When no phase of the PET raw materials or crushed material into the hopper, the crystallization of its processing, at the same time stirring, to prevent agglomeration of raw materials and reduce product defect rate. After crystallization at the bottom of the plastic can be transported from the hopper into the storage tank or directly to the drying drums used in the dry