1. Barrel temperature: the temperature to be controlled in 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 mainly affects the flow and cooling of plastics.

每一种塑料都具有不同的流动温度，同一种塑料，由于来源或牌号不同，其流动温度及分解温度是有差别的，这是由于平均分子量和分子量分布不同所致，塑料在不同类型的注射机内的塑化过程也是不同的，因而选择料筒温度也不相同。

Each kind of plastic has different flow temperature. Because of different sources or brands, the flow temperature and decomposition temperature of the same plastic are different. This is due to the difference of average molecular weight and molecular weight distribution. The plasticizing process of plastics in different types of injection machines is also different, so the selection of barrel temperature is also different.

2、喷嘴温度：喷嘴温度通常是略低于料筒至高温度的，这是为了防止熔料在直通式喷嘴可能发生的"流涎现象"。喷嘴温度也不能过低，否则将会造成熔料的早凝而将喷嘴堵塞，或者由于早凝料注入模腔而影响制品的性能。

2. Nozzle temperature: the nozzle temperature is usually slightly lower than the barrel to high temperature, which is to prevent the molten material from salivating in the straight through nozzle. The temperature of the nozzle should not be too low, otherwise the nozzle will be blocked due to the early solidification of the melt, or the performance of the product will be affected due to the injection of the early setting material into the mold cavity.

3、模具温度：模具温度对制品的内在性能和表观质量影响很大。模具温度的高低决定于塑料结晶性的有无、制品的尺寸与结构、性能要求，以及其它工艺条件（熔料温度、注射速度及注射压力、模塑周期等）。

3. Mold temperature: mold temperature has a great influence on the internal performance and apparent quality of products. The mold temperature is determined by the crystallinity of the plastic, the size and structure of the product, performance requirements, and other process conditions (melting temperature, injection speed and injection pressure, molding cycle, etc.).