1. Barrel Temperature: The injection molding process requires controlling the following temperatures: barrel temperature, nozzle temperature, and mold temperature. The first two primarily affect the plasticization and flow of the plastic, while the latter mainly affects its flow and cooling. Each plastic has a different flow temperature. Even for the same plastic, the flow and decomposition temperatures can differ due to variations in average molecular weight and molecular weight distribution. The plasticization process also differs between different types of injection molding machines, thus requiring different barrel temperatures.
2. Nozzle Temperature: The nozzle temperature is usually slightly lower than the maximum barrel temperature to prevent "drooling" that can occur in straight-through nozzles. The nozzle temperature should not be too low, otherwise, premature solidification of the molten material will clog the nozzle, or premature solidification will affect the product's performance.
3. Mold Temperature: Mold temperature has a significant impact on the internal properties and surface quality of the product. The mold temperature depends on the presence or absence of plastic crystallinity, the size and structure of the product, performance requirements, and other process conditions (melt temperature, injection speed and injection pressure, molding cycle, etc.).