注塑机的工作原理：与打针用的注射器相似，它是借助螺杆（或柱塞）的推力，将已塑化好的熔融状态（即粘流态）的塑料注射入闭合好的模腔内，经固化定型后取得制品的工艺过程。 一般螺杆式注塑机的成型工艺过程是：首先将粒状或粉状塑料加入机筒内，并通过螺杆的旋转和机筒外壁加热使塑料成为熔融状态，然后机器进行合模和注射座前移，接着向注射缸通人压力油，使螺杆向前推进，从而以很高的压力和较快的速度将熔料注入温度较低的闭合模具内，经过一定时间和压力保持（又称保压）、冷却，使其固化成型，便可开模取出制品。
Working principle of injection molding machine: similar to the syringe for injection, it is the process of injecting the plasticized melt state (i.e. viscous flow state) plastic into the closed mold cavity with the help of screw (or plunger) thrust, and then obtain the products after curing and shaping. The molding process of general screw injection molding machine is: firstly, the granular or powdery plastic is added into the barrel, and the plastic becomes molten through the rotation of the screw and the heating of the barrel outer wall, then the machine closes the mold and moves the injection seat forward, and then the injection cylinder is filled with pressure oil to push the screw forward, so as to inject the molten material into the lower temperature with high pressure and faster speed After a certain period of time and pressure holding (also known as holding pressure) and cooling, the closed mold can be opened to take out the products.
注塑成型的基本要求是塑化、注射和成型。塑化是实现和保证成型制品质量的前提，而为满足成型的要求
The basic requirements of injection molding are plasticization, injection and molding. Plasticization is the premise to realize and ensure the quality of molded products, and to meet the requirements of molding