Three-head screw element and twin-screw extruder using the element

Abstract

The invention discloses a three-head thread element and a twin-screw extruder using the element, wherein the center lines of the major diameter and the minor diameter of the thread element coincide, but the center lines of the two have an eccentric distance from the center of rotation. Due to the eccentricity between the center line of the major diameter and the minor diameter and the center of rotation, when the threaded element rotates in the barrel, there is always only one screw flight with a small gap with the inner wall of the barrel, and the other two screw flights are in contact with the inner wall of the barrel. The inner wall of the barrel maintains a large gap, so that the shearing effect on the material is much smaller than that of the ordinary three-threaded element, and the material generates less heat, which is especially suitable for some heat-sensitive materials; in addition, due to the large diameter and small diameter It is not concentric with the center of rotation, so the ratio of the major diameter to the minor diameter of the threaded element is low. Under the same process conditions, the filling degree of the material is higher than that of the ordinary three-start threaded element, so that high output can be obtained at low speed. , to reduce energy consumption.

Description

technical field [0001] The invention relates to a threaded element, in particular to a three-start threaded element used in a twin-screw extruder. Background technique [0002] In the twin-screw extruder, the screw element has the functions of conveying, shearing and mixing on the material, and can be divided into single-head, double-head, and multi-head according to the number of heads. In the same lead, the volume of the groove of the single-head thread element is larger, but because of its small number of ribs, the shearing effect on the material is much smaller than that of the double-head and multi-head, and the material is less The mixing effect is very poor, and it is rarely used in twin-screw extruders; due to the increase in the number of ribs and the increase in the number of ribs, the volume of the screw channel will decrease, and the output will decrease, but the shear and The mixing effect is enhanced, and it is widely used in twin-screw extruders. However, in...

AI Technical Summary

Problems solved by technology

However, in some special applications, the functions of ordinary double heads and triple heads cannot meet the technological requirements of material production.

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