Ultrahigh molecular weight polyethylene tube single screw extruder barrel forming method and the forming device thereof

Abstract

The present invention relates to a molding method and a molding device for an ultra-high Molecular Weight Polyethylene (UHMWPE) tubular product single-screw extruding machine barrel. With extrudability and calendering properties of ultra-high Molecular Weight Polyethylene in an elastomeric state, when the ultra-high Molecular Weight Polyethylene in an elastomeric state in extrusion force action fills a molding chamber which is formed between a feed rod screw and a machine barrel, preliminary molding of the ultra-high Molecular Weight Polyethylene tubular product is achieved; with continuous action of the extrusion force, preliminary molding tubular products achieve a homogenization process of temperature and geometric dimension through a shaping mandrel and a shaping set; then the tubular products complete cooling and shaping processes rapidly when passing a cooling set. The invention solves difficult technical problems that nearly no ultra-high Molecular Weight Polyethylene with a viscous state can process single-screw extruding molding in a molten state; on the premise of keeping excellent performance of the ultra-high Molecular Weight Polyethylene well, a goal of continuous production of the ultra-high Molecular Weight Polyethylene tubular product is achieved.

Description

technical field [0001] The invention relates to an ultra-high molecular weight polyethylene (UHMWPE) pipe single-screw extruder barrel forming method and forming equipment. Background technique [0002] The currently commonly used UHMWPE pipe molding methods are plunger extrusion molding and single-screw extrusion molding with special measures. [0003] Plunger extrusion molding can be regarded as continuous sintering molding. This molding method can use pure ultra-high molecular weight polyethylene powder to produce pure ultra-high molecular weight polyethylene pipes, so that the molecular weight of the product material will not decrease, and the ultra-high molecular weight is maintained. Polyethylene has all the excellent properties based on its ultra-high molecular weight characteristics, especially wear resistance and excellent mechanical properties, but this method takes a long time to plasticize, the production efficiency is low, and it is not suitable for forming larg...

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Problems solved by technology

[0003] Plunger extrusion molding can be regarded as continuous sintering molding. This molding method can use pure ultra-high molecular weight polyethylene powder to produce pure ultra-high molecular weight polyethylene pipes, so that the molecular weight of the product material will not decrease, and the ultra-high molecular weight is maintained. Polyethylene has all the excellent properties based on its ultra-high molecular weight characteristics, especially wear resistance and excellent mechanical properties, but this method takes a long time to plasticize, the production efficiency is low, and it is not suitable for forming large finished products, so it is limited in production and application

[0004] At present, the single-screw extruder can continuously form ultra-high molecular weight polyethylene pipe technology in the market. First, the ordinary single-screw extruder needs to be technologically improved, and at the same time, the raw material of ultra-high molecular weight polyethylene must be modified to increase the production capacity of the UHMWPE pipe. Fluidity in the process, the technology often leads to a substantial increase in product cost or at the expense of reduced product performance

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