Industrial Hopper Dryer for Plastic Resin Moisture Removal

Hopper dryer adopts hot air to remove moisture from plastic materials. The stainless steel hopper ensures no material contamination. The precise temperature control system ensures uniform drying. Timer function allows automatic operation. The drying temperature and time can be adjusted according to material requirements. Applicable for PET, PC, PA, ABS and other hygroscopic materials. The unit features compact structure, easy operation and maintenance.

The hopper dryer is essential for removing moisture from hygroscopic plastic resins before injection molding or extrusion to prevent steam formation that causes surface defects and internal voids. In PET preform manufacturing, the hopper dryer removes residual moisture from PET pellets to the required less than 50 ppm level, ensuring that bottle walls are free from bubbles and hazing that would compromise structural integrity and transparency. For polycarbonate optical component production, proper drying is critical — any moisture above 0.02% causes hydrolysis during injection which degrades the polymer molecular weight and reduces impact strength. Nylon compounding facilities use hopper dryers to prepare polymer granules for extrusion, ensuring that the finished compound pellets are free from moisture-induced defects. The drying temperature and time settings vary by resin type, with PET typically requiring 150-170 degrees Celsius for 4-6 hours while nylon may need 80-100 degrees Celsius for similar durations.