注塑成型（injection molding）又称注射成型，是将粒料或粉状塑料从注塑机的料斗送入加热的料筒中，经加热塑化成熔融状态，由螺杆施压而通过料筒端部的喷嘴注入低温的、闭合的模具型腔中经冷却硬化而保持模腔所赋予的形状，开模取出胶体后就完成了一个工作周期。

优点：成型周期短、能耗小，产品精度高、可一次成型复杂制件

缺点：模具成本高，不适宜小批量制品

相关产品：短切纱、热塑性直接纱

Injection moulding is also called infusion moulding. During injection moulding, granules or powdery plastics are sent to the heated charging barrel through the hopper of injection moulding machine and become molten state through heating and fluxing, and the melted granules or powdery plastics shall be injected to the low-temperature and closed mould cavity through the nozzle at the end of the hopper under the pressure of screw. Shape given by mould cavity will be maintained after cooling and curing and then colloid can be taken from the cavity, thus a processing cycle is accomplished.

Advantages: short period and small amount of energy consumption when moulding, high-precision products and through this process, complex products can be formed into at one time

Disadvantages: high cost of the mould, not suitable for small-batch products

Related products: chopped strand and thermoplastic direct roving