Automatic screen changing device for multiple layers of filter screens for PET plastic flat wire drawing machine

Abstract

The invention discloses an automatic screen changing device for multiple layers of filter screens for a PET plastic flat wire drawing machine and aims at solving the problems that a melt extrusion opening is blocked due to impurity accumulation in the production process, the melt passing rate is reduced and the filter screens need to be frequently cleaned or changed to affect normal production. The automatic screen changing device comprises two or more layers of filter screens which are arranged in an overlapping manner. The automatic screen changing device is characterized in that the mesh number of each layer of filter screen is 160-200; a main electric heating tube is arranged at a middle passage part of the PET melt extrusion opening; a cooling system is arranged at the outer side of the main electric heating tube through an isolation body; a screen changing heating system is arranged on the periphery of the cooling system in an PET melt extrusion channel; and when the middle passage part of the PET melt extrusion opening generates pressure on the filter screens due to sundry increase, the screen changing heating system is capable of automatically heating the peripheral region, so that the PET melt changes the walking direction. The extrusion strength of the filter screens is improved and blocking is avoided.

Description

technical field [0001] The invention relates to plastic processing equipment technology, in particular to an automatic screen changing device for multi-layer filter screens used on a PET plastic flat wire drawing machine. Background technique [0002] PET plastic is widely used in various food, medicine, non-toxic and sterile packaging materials, as well as substrates in the electronic field, mechanical field, movie film, computer floppy disk, etc., resulting in a large amount of garbage. Treasure is a larger project. In the production process of making these waste into flat yarns as raw materials for woven bags and other products, it is inevitable to be mixed with some impurities, so it is necessary to filter out these impurities and paste through the mesh in the screen changer. Extrusion type screen changer is Manual or automatic switching device consisting of one or more screens, used to filter out foreign particles and impurities as the plasticized material flows throug...

AI Technical Summary

Problems solved by technology

[0003] These devices are mainly used to make plastic flat wire from polypropylene PP or polyethylene PE through a plastic flat wire drawing unit. The product quality is difficult to meet high requirements, especially for PET waste plastics. The material extrusion port is blocked, which reduces the passing rate of the molten material, and requires frequent cleaning or replacement of the filter screen, which affects normal production

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