An extrusion screw for reducing the inner wall roughness of medical grade tpu thin-walled tubes

Abstract

The purpose of the present invention is to solve the problem of easy inner wall roughness when extruding thin-walled tubes, and discloses an extrusion screw that reduces the inner wall roughness of medical-grade TPU thin-walled tubes, including a first screw and a mounting plate, the first screw The right side of the surface is provided with a guide, the right side of the surface of the first screw is covered with a collar, the surface of the collar is fixedly installed with an air pump, the upper surface of the collar is fixedly installed with a slide plate, the surface of the slide plate is welded with a rack, and the mounting plate is symmetrically installed with Fasten the screws, the left side of the mounting plate is fixedly equipped with a mounting column, the left side of the mounting column is fixedly equipped with a motor, the middle part of the motor is equipped with a gear, the left end of the first screw is fixedly connected with a connecting rod, and the surface of the connecting rod is covered with a second screw. The invention controls the inflation of the bump by the air pump, and can increase the extrusion pressure during extrusion, so as to reduce the roughness of the inner wall and reduce the scrap rate when processing the thin-walled pipe.

Description

technical field [0001] The invention relates to the field of extrusion screws, in particular to an extrusion screw that reduces the roughness of the inner wall of a medical-grade TPU thin-walled tube. Background technique [0002] Develop medical-grade TPU thin-wall tube extrusion screw components with TPU (thermoplastic polyurethane elastomer rubber) as the main raw material. Aiming at the problems of high fluidity of TPU material and difficulty in forming ultra-thin wall thickness, it is easy to cause compactness when extruding thin-wall parts Insufficient, lack of glue, pores, insufficient grammage, uneven appearance, lines, scorched particles, snake-like surface, fish eyes (unmelted point) and other defects require targeted screw material and combination design. The project has been investigated and listened to users' feedback. According to the characteristics of the raw materials used and the actual requirements of the product, the cemented carbide steel screw is adopte...

AI Technical Summary

Problems solved by technology

[0003] After research by the research team, when extruding thin-walled tubes, ordinary screws tend to make the inner wall rougher, and it is difficult to control the extrusion force on the inner wall of the tube wall during injection molding, and because the screw structure is If it is fixed, it will affect its stability during injection molding, which will cause roughness and deformation of the inner wall of the thin-walled tube, which will cause the thin-walled tube to be scrapped and affect the yield. Extrusion screw with grade TPU thin-walled pipe inner wall roughness to solve the shortage of extrusion screw

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