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| Term | Definition |
|---|---|
| Two-Stage Injection |
The two-stage plasticator injector unit utilizes two separate stages to perform its function. The first, or plasticating stage, is devoted to the melting and mixing of the plastic melt by utilizing long, rotating screws. This screw conveys the processed plastic forward where, by means of a diverter valve, it is transferred into the injection or holding cylinder. When a sufficient quantity of melt has been plasticated and transferred into the injection cylinder, the diverter valve shifts to create a flow path from the injection cylinder to the mold runner system, and the second stage or injection stage, now begins. The melted plastic is forced out of the injection cylinder by a hydraulically driven piston or plunger. After injecting the melt into the mold, the diverter valve again shifts to connect the flow path from the rotating screw to the injection cylinder to transfer more plasticated material into the cylinder for the next cycle. During injection the plasticating screw continues to rotate and reciprocate to build up a change in front of it for the next cycle. |