The structure of the rubber extruder's screw:
The conventional full-thread three-section screw can be divided into three forms according to the change of the thread lift and the groove depth:
1.equidistant deepening screw
The speed of the change of the depth of the groove of the equidistant variable-depth screw can be divided into two forms:
1. Equidistant gradual screw: a screw whose depth from the feeding section to the last groove of the homogenization section is gradually shallower. On the longer melting section, the groove depth is gradually shallower.
2. Equidistant sudden change screw: The screw groove depth in the feeding section and the homogenization section is unchanged, and the screw groove depth at the melting section suddenly becomes shallow.
2.constant depth variable pitch screw
Constant-depth variable-pitch screw means that the depth of the groove is constant, and the pitch starts from the first groove of the feeding section to the end of the homogenization section.
3.variable-depth variable-pitch screw
Variable-depth variable pitch screw refers to a screw in which the depth of the screw groove and the angle of the screw rise gradually change from the feeding section to the end of the homogenization, that is, the screw lift gradually narrows from the width, and the groove depth gradually becomes shallower from the deep. This screw has the characteristics of the previous two screws, but it is difficult to machine and is rarely used.
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