The molding process of general screw injection molding machine is:
first, add granular or powdery plastic into the barrel, and make the plastic melt through the rotation of the screw and the heating of the outer wall of the barrel, then the machine closes the mold and moves the injection seat forward to make the nozzle close to the gate of the mold, and then inject pressure oil into the injection cylinder to push the screw forward,—carrier tape when manufacture

Thus, the molten material is injected into the closed die with low temperature at high pressure and fast speed,
After a certain time and pressure holding (also known as pressure holding) and cooling, the product can be opened and taken out (the purpose of pressure maintaining is to prevent the reverse flow of molten material in the mold cavity, supplement materials to the mold cavity, and ensure that the products have a certain density and dimensional tolerance). —carrier tape when manufacture

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 in order to meet the molding requirements, the injection must ensure sufficient pressure and speed. At the same time, due to injection The injection pressure is very high, which generates high pressure in the mold cavity (the average pressure in the mold cavity is generally between 20 ~ 45MPa), so there must be enough clamping force.—-carrier tape when manufacture

It can be seen that the injection device and clamping device are the key components of the injection molding machine.