Using the squeezability and mouldability of plastics, the loose granule or powder molding material is sent from the hopper of the injection machine into the high-temperature cylinder for heating, melting and plasticizing

It becomes a viscous melt, driven by a plunger or a screw at high pressure and injected at a high velocity through a nozzle at the front of the barrel into a closed mold at a lower temperature

After a period of pressure maintaining cooling and setting time, the mold can be opened to release plastic parts with a certain shape and size from the mold cavity.