Ii. Pressure control

General knowledge of injection molding operation: pressure in the process of injection molding includes plasticizing pressure and injection pressure, and directly affects the plasticizing and product quality of plastics.

1. Plasticizing pressure:

(back pressure) when screw type injection machine is used, the pressure on the top of the screw when the screw rotates backward is called plasticizing pressure, also known as back pressure. This pressure can be adjusted by the overflow valve in the hydraulic system.

2. Injection pressure:

In current production, the injection pressure of nearly all metal powder injection molding machines is based on the pressure applied to the plastic on the top of the plunger or screw, which is converted from the oil pressure. The role of injection pressure in injection molding is to overcome the flow resistance of the plastic from the cylinder to the mold cavity, to give the rate of mold filling of the melt and to compaction of the melt.