Detailed introduction

30

2020

-

12

Common structure classification of rubber screw


Rubber screwCooperate with the barrel, the barrel contains the screw,Rubber screwTurn in the barrel. When the screw rotates to push the plastic to move forward in the barrel, the external heating of the barrel conducts heat to the plastic in the barrel. Coupled with the gradual reduction of the thread volume on the rubber screw, the plastic in the thread groove is uniformly mixed and plasticated after being subjected to various forces such as extrusion, overturning and shearing. As moving to the front of the barrel, it gradually melts in a viscous flow state, completing the plasticization of the plastic.Rubber screwWith the normal work of the barrel, to ensure the continuous extrusion of the extruder raw material molding production.

 

According to the change of thread lift and groove depth,Rubber screwThe common structural classification of can be divided into three forms:

1. the equidistant deepening screw, the speed of the equidistant deepening screw from the depth of the groove can be divided into two forms:

12. Isometric gradient screw: from the feeding section to the end of the homogenization section, the depth of a screw groove is gradually shallower.Rubber screwIn the longer melting section, the depth of the groove is gradually shallower;

22. Isometric mutation screw: I .e. the depth of the screw grooves in the feeding section and the homogenizing section remains unchanged, while the depth of the screw grooves in the melting section suddenly becomes shallow.Rubber screw.

II. Equal depth variable pitch screw

Equal depth variable pitch screw means that the depth of the screw groove is constant, and the pitch is gradually narrowed from wide to narrow from the beginning of the screw groove at the beginning of the feeding section to the end of the homogenization section.Rubber screw.

3. variable pitch screw

The variable depth and variable pitch screw means that the depth of the screw groove and the rising angle of the thread change gradually from the beginning of the feeding section to the end of the homogenization.Rubber screwThat is, the thread lift gradually narrows from wide to wide, and the depth of the screw groove gradually becomes shallow from deep.Rubber screwIt has the characteristics of the previous two screws, but it is difficult to machine and less used.