Injection Molding Screw Introduction

Injection Molding Screw Introduction

Injection screw is an important part of injection molding machine. Its role is to transport, compact, melt, stir and pressure the plastic. All this is done by rotating the screw in the barrel. When the screw rotates, the plastic will produce friction and mutual movement on the inner wall of the barrel, the bottom surface of the screw groove, the pushing surface of the screw edge, and between the plastic and the plastic. The plastic is pushed forward as a result of this combination of motion, and the heat generated by friction is absorbed to raise the plastic's temperature and melt it.

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The structure of the screw will directly affect the degree of these effects. Ordinary injection screw structure, there are also designed to improve the quality of plasticizing screw separation type, barrier type screw or splitter type screw. The structure of the barrel is actually a circular tube with a feeding port in the middle. In the process of plastic plasticizing, its forward and mixing power is derived from the relative rotation of screw and barrel.