Injection molding is also called injection molding. It is an injection and molding method. The advantages of injection molding are fast production speed, high efficiency, automatic operation, many colors, and shapes from simple to complex. The size can be from large to small, and the product size is accurate, the product is easy to update, and it can be a complex shaped part... Therefore, injection molding is suitable for mass production and complex shape products.

How to control the temperature is very important in injection molding. Today we learn more acknowledge about the temperature. Below is a picture that shows the principle of temperature control. 

1. Barrel temperature

The injection molding process needs to control the temperature of the 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 with different flow temperatures, the same plastic has different flow temperature and decomposition temperature due to different sources or grades. This is due to the difference in average molecular weight and molecular weight distribution. The plasticization of plastics in different types of injection machines, the process is also different, so the temperature of the selected barrel is also different.

2. Nozzle temperature

The temperature of the nozzle is usually slightly lower than the maximum temperature of the barrel. This is to prevent the "salvation phenomenon" of the molten material in the straight-through nozzle. The temperature of the nozzle should not be too low, otherwise it will cause premature coagulation of the melt and block the nozzle or affect the performance of the product due to the injection of the early coagulation into the mold cavity.

3 The mold temperature

The mold temperature has a great influence on the internal performance and apparent quality of the product. The temperature of the mold 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.). 

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