Rotary filter for purifying fusant of plastic extrusion system

Abstract

The invention discloses a rotary filter for purifying a fusant of a plastic extrusion system. The rotary filter comprises a feeding end machine body and a discharging end machine body; a filter net disc is arranged between the feeding end machine body and the discharging end machine body through a connecting and fastening element; the filter net disc generates rotary motion through the matched action of a detent type transmission device; the filter net disc is provided with a plurality of filtering passages formed by a plurality of filter net holes; the filter net disc is tightly covered by the feeding end machine body and the discharging end machine body; the feeding end machine body is provided with a net exchanging chamber; the outside of the net exchanging chamber is provided with a door body which can open or lock the net exchanging chamber; by opening or locking the net exchanging chamber by the door body, the rotary filter conveniently and safely completes the exchange of a new net sheet and an old net sheet of the filter net holes under the condition of ensuring almost unchanged pressure in high-pressure production.

Description

technical field [0001] The invention relates to a melt purification filter used in plastic extrusion production, in particular to a rotary filter used for purification of melt in a plastic extrusion system. Background technique [0002] In the field of production and extrusion of plastic plates, sheets, and films, the filter is an accessory device connected between the extruder and the die, and the molten medium at the feed end is filtered through the filter mesh inside the filter and promoted again. Plasticizing to meet the requirements of the manufactured product. [0003] At present, most of the filter structures used in the industry are intermittent screen-changing structures. The basic principle is that under normal working conditions, the molten medium at the feed end is filtered through the internal filter mesh. The configured control system changes the screen. During the screen change period, the flow of the molten medium will be blocked, so that during the intermit...

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Problems solved by technology

[0003] At present, most of the filter structures used in the industry are intermittent screen-changing structures. The basic principle is that under normal working conditions, the molten medium at the feed end is filtered through the internal filter mesh. The configured control system changes the screen. During the screen change, the flow of the molten medium will be blocked, so that during the intermittent process of stopping and walking, large fluctuations will occur, which is not conducive to extrusion production. This phenomenon has greatly increased the reject rate of products, resulting in a waste of production costs to a certain extent.

[0004] In addition, the applicant's ZL200510106266.5 discloses a rotary filter, the area of ​​the filter plate through which the melt passes is increased, but its working efficiency is still very poor. The filter mesh disk is exposed in the air, and the filter mesh disk needs to increase a lot of energy consumption to ensure a certain temperature

When the new filter mesh enters the working state, the melt will be polluted by the residual air in the melt channel of the filter tray, which will affect the normal production, and there will be a large area of ​​polluted filter mesh and the new filter mesh The holes are replaced instantaneously, which will cause a large change in the pressure of the melt and affect normal production

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