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Ultrahigh molecular weight polyethylene injection moulding machine

An injection molding machine and ultra-high molecular weight technology, applied in the field of plastic injection molding machines, can solve problems such as poor fluidity, and achieve the effect of increasing the effective coefficient of friction

Inactive Publication Date: 2007-02-28
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention: through the improvement of the plasticizing device of the injection molding machine, it can effectively prevent the leakage of the material during the forward movement of the injection, reduce the plasticizing resistance, improve the propulsive force of the screw and the injection mold filling ability, so that the common Structured molds and general injection molding procedures can realize injection molding of plastics with high viscosity and poor fluidity, such as ultra-high molecular weight polyethylene, which are difficult to process

Method used

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  • Ultrahigh molecular weight polyethylene injection moulding machine
  • Ultrahigh molecular weight polyethylene injection moulding machine
  • Ultrahigh molecular weight polyethylene injection moulding machine

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Embodiment

[0028] The theoretical injection volume implemented according to the present invention is 327cm 3 A plastic injection molding machine with a screw diameter of 45mm, a groove depth of the first homogenization section of 2.8mm, a compression ratio of 1.93, a screw groove depth of 2.4mm in the second homogenization section, and a compression ratio of 2.25mm; The cone angle of the first-stage cone and the second-stage cone is 20°, the thickness of the gap between the nozzle check zone and the precursor check zone is 0.3mm, the gap width is 32mm, the nozzle hole diameter is 1.8mm, and the screw pitch is 32mm.

[0029] The injection molding molds are common structure tensile test sample molds, impact test sample molds and wear test sample molds, and the mold heating temperature is 87°C. The ultra-high molecular weight polyethylene raw material is a powdery resin with a viscosity-average molecular weight of 2.7 million. Add a small amount of additives and mix evenly with a high-speed...

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Abstract

The invention relates to a the super high molecule weight polyethylene inject molding machine, its average segment of screw is composed by the first average segment and the second average segment, the second average segment composes a loop screw stop domain with the inner wall of the machine canister, the head of the screw includes the first grade column, the first grade cone, the second grade column and the second grade cone, the first grade column outer diameter and the column inner diameter of the injection composes the former stop domain, the second grade column outer diameter and spray mouth composes the spray mouth stop domain, the spray has a store room which is composed with column cavity and prick cavity, this invention can prevent the material be returned effectively, decrease the resistance of plastics, improve the screw pull power and the inject capacity, so the difficult work of super high molecule weight polyethylene inject molding can be done by the mould with the normal construction.

Description

technical field [0001] The invention relates to a plastic injection molding machine, especially the improvement of its plasticizing device, which is suitable for injection molding of ultra-high molecular weight polyethylene and fluoroplastics, and other plastics with high viscosity and poor fluidity. Background technique [0002] Ultra-high molecular weight polyethylene is a linear polyethylene with a viscosity average molecular weight of more than 1.5 million. It has excellent comprehensive performance such as wear resistance, impact resistance, corrosion resistance, self-lubrication, impact energy absorption, and low temperature resistance. It is suitable for making various wear-resistant , Impact-resistant, corrosion-resistant, self-lubricating parts. However, due to the extremely high melt viscosity (almost no fluidity), molding processing is extremely difficult. [0003] When using ordinary plastic injection molding machines to process ultra-high molecular weight polye...

Claims

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Application Information

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IPC IPC(8): B29C45/47B29C45/20
Inventor 何继敏陈卫红
Owner BEIJING UNIV OF CHEM TECH
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