The injection molding machine process

- Feb 08, 2021-

The general molding process of a screw injection molding machine is as follows: First, granular or powdered plastic is added to the barrel, and the plastic is melted by the rotation of the screw and the heating of the outer wall of the barrel, and then the machine closes the mold and moves the injection seat forward. Make the nozzle close to the gate of the mold, and then pass pressure oil into the injection cylinder to push the screw forward, thereby injecting the melt into the closed mold with a lower temperature at a high pressure and a faster speed. Time and pressure hold (also known as holding pressure), cooling to make it solidify and form, then the mold can be opened to take out the product (the purpose of holding pressure is to prevent the backflow of the melt in the mold cavity, replenish materials into the mold cavity, and ensure the product Has a certain density and dimensional tolerance).