PVC polyvinyl chloride granules

PVC plastics have different forms and differences, and the processing methods are also diverse, which can be pressed, extruded, injected, coated, etc. The particle size, fisheye, bulk density, purity, foreign impurities, and porosity of PVC resin have an impact on processability; Paste resin should consider the viscosity and gelatinization properties of the paste.

PVC is an amorphous polymer with a small shrinkage. The powder should be preheated before processing to remove moisture, enhance the plasticizing effect and prevent air bubbles. Moreover, PVC is very easy to decompose, especially in contact with steel and copper at high temperatures (decomposition temperature 200 degrees). The molding temperature range is small and the material temperature must be strictly controlled. When using a screw injection machine and a straight-through nozzle, the pore size should be large to prevent dead ends. The mold pouring system should be coarse, the gate section should be large, the mold should be cooled, the mold temperature should be 30-60 °C, and the material temperature should be 160-190 °C.