When the injection molding process of the fully automatic injection molding machine is completed, the entire cavity is filled with the melt. At this time, the injection screw has moved to the front position. Due to the cooling effect of the low temperature mold of the automatic injection molding machine, the melt in the injection chamber contracts. In order to produce high quality products, prevent the melt from flowing back in the cavity, compensate for the shrinkage of the product, and press the injection cylinder. A certain amount of pressure must be maintained to continuously push the screw and apply pressure to the melt in the mold until the melt at the gate cools the seal. At this time, the pressure acting on the melt is referred to as a holding pressure by a screw, which is also referred to as a secondary pressure. When the pressure is maintained, the screw will move forward a little because of the feed.

 

When the molten material of the fully automatic injection molding machine loses the possibility of backflow in the cavity door, the internal pressure can be removed (the high pressure hydraulic cylinder can also be removed) (ie the door is closed), and the injection cylinder can be used to cool and shape the product to death.

 

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