Two-stage seven-section high-rotating-speed high-yield PP extrusion screw rod

Abstract

The invention discloses a two-stage seven-section high-rotating-speed high-yield PP extrusion screw rod. A charging section, a compression section, a first metering section, a shearing section, a pressure reducing section, a second metering section and a polyhedron mixing section are arranged in sequence in a direction from feeding to a screw rod head; the charging section is provided with a charging groove consisting of single threads; the first and second metering sections are provided with metering grooves consisting of single threads; the pressure reducing section is provided with a pressure reducing groove consisting of single threads; the compression section is provided with main threads and additional threads; the main threads and the single threads of the charging section are connected to form a solid-phase groove; the additional threads and the single threads of the first metering section are connected to form a liquid-phase groove; the shearing section is provided with multiple pairs of feeding spiral blind grooves and discharge spiral blind grooves; inlets of the feeding spiral blind grooves are connected with the first metering section; and the discharge spiral blind grooves are connected with the pressure reducing section. The two-stage seven-section high-rotating-speed high-yield PP extrusion screw rod is high in melting efficiency, uniform in plastifying, uniformin mixing and high in yield under high rotating speed.

Description

technical field [0001] The invention relates to a high-speed, high-yield PP extrusion screw, in particular to a two-stage, seven-section high-speed, high-yield PP extrusion screw. Background technique [0002] The structure of the existing common PP extrusion screw shows that the screw is a single-thread structure, and the direction from the feed to the screw head generally includes a feeding section, a compression section, a metering section and a screw head. When the plastic enters the barrel from the hopper, thus The material enters the feeding section, and under the action of the screw rotation, it is gradually transported forward to the compression section through the friction between the inner wall of the barrel and the surface of the screw. The depth of the screw groove in the compression section becomes shallower, and the solid material is further compacted. Heating, and under the action of friction and shear between the screw and the inner wall of the barrel, the ma...

AI Technical Summary

Problems solved by technology

[0003] Currently commonly used extrusion screw, when processing PP, generally has poor material homogenization degree and poor mixing effect, resulting in poor product quality, and its output is significantly affected by the head pressure, and the output fluctuates greatly, especially in high machine Under the head pressure, the output drops significantly, the production efficiency is low, and the output fluctuates greatly. In addition, at high output or at high screw speed, the material does not reach melting

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