According to the needs of users, the injection molding plant injects the hot melt materials into the mold cavity from high pressure, and obtains some complex parts after cooling and curing. Injection molding is a frequently used part processing method. Next, the injection molding factory will introduce the temperature control during injection molding:

1、料筒溫度：注射模塑過程需要控製的溫度有料筒溫度，噴嘴溫度和（hé）模（mó）具溫度等。前兩種溫度主要影響塑料的塑化和流動，而後一種溫度主（zhǔ）要是影響塑料的流（liú）動和冷卻（què）。每一種（zhǒng）塑料（liào）都具有不同的流動溫度（dù），同一種塑料，由於來源（yuán）或牌號（hào）不同，其流動（dòng）溫度及（jí）分解溫度是有差別的，這是由於平均分子量和分子量分布不同所致，塑料在不（bú）同類型（xíng）的注射機內的塑化過程也是不同的，因而（ér）選擇料筒溫度也不相（xiàng）同。

1. Barrel temperature: the temperature 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, and the second temperature mainly affects the flow and cooling of plastics. Each plastic has different flow temperature. For the same plastic, due to different sources or brands, its flow temperature and decomposition temperature are different, which is due to different average molecular weight and molecular weight distribution. The plasticization process of plastics in different types of injection machines is also different, so the barrel temperature is also different.

2、噴嘴溫度：噴嘴溫度通常是略低於料筒溫度的，這是為了（le）防止熔料在直通（tōng）式噴（pēn）嘴可能（néng）發生的"流（liú）涎現象（xiàng）".噴嘴溫度也不能過低，否則將會（huì）造成熔料的早凝而將噴嘴堵塞，或者由於（yú）早凝料注入（rù）模（mó）腔而影響製品的性能。

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

3、模具溫度：模具溫度對製品的內在（zài）性能和表觀（guān）質量影響很大。模具溫度的高低決定於塑料結（jié）晶性的有無、製品的尺寸與（yǔ）結構、性（xìng）能要求（qiú），以及其它（tā）工藝條件（熔料溫度、注射速度及注射（shè）壓力（lì）、模塑周期等）。

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

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