The fused materials in the mold cavity restore from viscous and fluid state to glassy state after being cooled. After complete cooling and molding, the plastic parts in the mold cavity are ejected by the ejector unit during mold opening, thereby the whole process of molding of the injected parts being completed.

centering on the screw, three procedures shall be needed to complete an injection cycling period:

1) The injection tank plunger, under the scheduled pressure, pushes the screw forward to inject the

plasticated fused materials;

2) The injection tank plunger, under the scheduled pressure, further pushes the screw forward to

supplement the materials and to maintain pressure;

3) The oil pressure motor drives the screw to rotate and to supplement materials to be plasticated;

the screw overcomes the scheduled pressure on the injection tank plunger, moves backward until the work has been completed, and prepares for he next injection; on the other hand, after the cooling and molding of plastics in the mold cavity, the ejection shall be made.