1. Barrel temperature: The temperature that needs to be controlled in the injection molding process includes barrel temperature, nozzle temperature and mold temperature. The first two temperatures mainly affect the plasticization and flow of plastics, while the latter temperature mainly affects the flow and cooling of plastics. Each plastic has a different flow temperature, the same plastic, due to different sources or brands, its flow temperature and decomposition temperature are different, which is due to the average molecular weight and molecular weight distribution is different, plastic plasticization process in different types of injection machines is also different, so the selection of barrel temperature is also different.
2. Nozzle temperature: The nozzle temperature is usually slightly lower than the maximum temperature of the barrel, which is to prevent the "salivation phenomenon" that may occur in the straight-through nozzle. The nozzle temperature should not be too low, otherwise it will cause the early coagulation of the melt and block the nozzle, or affect the performance of the product due to the injection of the early condensate into the mold cavity.
3. Mold temperature: Mold temperature has a great influence on the intrinsic performance and apparent quality of the product. The mold temperature depends on the crystallinity of the plastic, the size and structure of the product, the performance requirements, and other process conditions (melt temperature, injection speed and injection pressure, molding cycle, etc.).
