How dry plastic particles do not produce bubbles, cracks?
Injection molding products have bubble treatment: 1, improve mold temperature, reduce injection molding time and cycle. Because PP bubbles are formed by internal shrinkage due to excessive cooling time. 2, increase the back pressure, extend the injection time, use high pressure and low speed. 3, storage speed is too fast, appropriate add a little back pressure. 4, raw drying is not enough, containing moisture. 5. The plastic stays in the cartridge for too long. 6, screw shot back too long. 7 、 poor mold exhaust. 8 、 injection pressure is too small, injection speed is too large. 9, melt temperature is too high, mold temperature is too low.
The plastic particles need to be thoroughly dried and dried, otherwise bubbles and cracks will appear
Plastic particles to the injection of good results, less defective, it is necessary to see what the raw materials. The physical properties of various materials are different, and the drying time and temperature are different. For plastic particles to dryer with a special needle, such as Heng Rong Machinery production for various raw materials for the production of different drying machine, dryer, stainless steel like what crystallization dryer, honeycomb desiccant dryer, dryer box etc.. The drying of plastic raw materials should reach the moisture content of various molding requirements, so that the output of defective products will be very little.
