The plastic dehumidifier integrates three functions: dehumidification, drying, and two-stage feeding, especially suitable for engineering plastic raw materials with strong hygroscopicity. For example, PA, PET, PC, PBT, etc., the optical grade GCD-OP model can be used for process applications of optical grade products such as lenses, LCD light guide plates, and optical discs, with a minimum dew point below -40 ℃ under ideal conditions