Forming method and equipment of macromolecular material profile by using single-screw extrusion cylinder

Abstract

The invention relates to forming method equipment of a macromolecular material profile by using a single-screw extrusion cylinder, wherein the forming method is carried out in sequence according to the following steps that: a macromolecular material is fed from a feeding base; a screw is stationary; the macromolecular material moves ahead along the direction of a spiral groove and is gradually compacted; a groove is formed in the inner wall of the compacted section of the screw corresponding to a power cylinder; enough extrusion pressure is generated at the compacted section; when the macromolecular material reaches the end surface of the screw, a screw ridge line is gradually changed into a straight line, so that the macromolecular material does the linear motion in the event of entering a profile forming region; the macromolecular material is gradually transited from a sector at the end surface of the screw to the shape corresponding to the profile in a cavity between a profile forming core rod and an outer profile forming mould, and therefore, the forming process of the profile is realized. The forming method of the macromolecular material profile by using the single-screw extrusion cylinder has the advantages of being capable of continuously forming profiles by using macromolecular materials or composite materials with poor mobility, even no mobility by using the single screw; and the macromolecular material profile formed by the forming method disclosed by the invention can keep physical properties of raw materials.

Description

technical field [0001] The invention relates to a continuous and high-efficiency single-screw extruder barrel molding method and equipment for polymer material profiled materials. The method can form polymer materials with poor fluidity and thermosetting plastic profiled materials. Background technique [0002] At present, the molding methods of polymer material profiles are mainly obtained by using ordinary single (twin) screw extruders combined with profile heads to form profiles and mechanically processing polymer block blanks. [0003] For the molding of polymer material profiles with certain fluidity during the molding process, single (twin) screw extruders are generally used in combination with profile heads to form them. This molding method is mature and has high molding efficiency and is widely used. For thermosetting plastics and polymer materials with poor molding fluidity, such as ultra-high molecular weight polyethylene (UHMWPE) and polytetrafluoroethylene (PTFE)...

AI Technical Summary

Problems solved by technology

For thermosetting plastics and polymer materials with poor molding fluidity, such as ultra-high molecular weight polyethylene (UHMWPE) and polytetrafluoroethylene (PTFE) and other molding methods, the molding method is used or the molding method is used first. block, etc.), and then obtain the required profile through mechanical processing. This method has discontinuous forming process, serious material waste, and low production efficiency. At the same time, due to the long forming time, the local temperature of the material is too high, which may cause the material Degradation affects the performance of the product

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