How to Control the Temperature During Injection Molding

1. Barrel temperature: The temperature that needs to be controlled during 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. Every type of plastic has a different flow temperature, and the flow temperature and decomposition temperature of the same plastic vary due to different sources or grades. This is because the average molecular weight and molecular weight distribution are different, and the plasticization process of plastic in different types of injection machines is also different. Therefore, the selection of barrel temperature is also different.

2. Nozzle temperature: The nozzle temperature is usually slightly lower than the highest temperature of the material barrel, in order to prevent the possible "salivation phenomenon" of molten material in the straight through nozzle. The nozzle temperature should not be too low, otherwise it will cause premature solidification of the melt and block the nozzle, or affect the performance of the product due to the injection of premature solidification material into the mold cavity.

3. Mold temperature: Mold temperature has a significant impact on the intrinsic properties and apparent quality of the product. The temperature of the mold is determined by the presence or absence of plastic crystallinity, the size and structure of the product, performance requirements, and other process conditions such as melt temperature, injection speed and pressure, molding cycle, etc.