The working principle of a zipper machine is similar to that of a syringe used for injection. It uses the thrust of a screw (or plunger) to inject plasticized plastic in a molten state (i.e. viscous flow state) into a closed mold cavity, and then solidifies to obtain the product.

Injection molding is a cyclic process, each cycle mainly includes: quantitative feeding - melting plasticization - pressure injection - mold filling and cooling - mold opening and pulling. Pull out the plastic part and then close the mold for the next cycle.

Zipper machine operation project: The zipper machine operation project includes three aspects: control keyboard operation, electrical control system operation, and hydraulic system operation. Select the injection process action, feeding action, injection pressure, injection speed, and ejection type separately, monitor the temperature of each section of the material barrel, and adjust the injection pressure and back pressure.

The molding process of a general screw type zipper machine is as follows: first, granular or powdered plastic is added to the barrel, and the plastic is melted 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. Then, pressure oil is introduced into the injection cylinder to push the screw forward, Thus, the molten material is injected into a closed mold with a low temperature at a high pressure and a fast speed. After a certain period of time and pressure maintenance (also known as pressure maintaining) and cooling, the product can be solidified and formed. The purpose of pressure maintaining is to prevent the reverse flow of molten material in the mold cavity, replenish material into the mold cavity, and ensure that the product has a certain density and dimensional tolerance. The basic requirements for injection molding are plasticization, injection, and molding. Plasticization is a prerequisite for achieving and ensuring the quality of molded products, and in order to meet the requirements of molding, injection must ensure sufficient pressure and speed. At the same time, due to the high injection pressure, a corresponding high pressure is generated in the mold cavity (the average pressure in the mold cavity is generally between 20 and 45 MPa), so there must be sufficient clamping force. It can be seen that the injection device and clamping device are key components of the injection molding machine.