Low-molecular condensate and gas separation device for vacuum system of double-screw extruder

Abstract

The invention discloses a double-screw extruder vacuum system low-molecular condensate and gas separation device which comprises a hollow device body, the outside of the device body is connected with a gas inlet and a gas outlet which are used for gas inlet and outlet, the outside of the gas inlet is connected with a vacuum measuring probe, and the outside of the gas outlet is connected with a gas outlet. A detachable partition plate is arranged in the equipment main body, the outer surface of the partition plate is a rough surface, a certain distance is formed between the edge surface of the partition plate and the inner wall of one side of the equipment main body, the outer part of the air outlet is connected with vacuum equipment, and a sewage draining exit is formed in the lower end of the equipment main body. According to the device, the situation that the vacuum degree becomes poor and the impeller of the vacuum pump is clamped can be avoided, meanwhile, the partition plates do not need to be cleaned frequently, the cleaning frequency is reduced, and the working efficiency is improved.

Description

technical field [0001] The invention relates to the field of separation of low-molecular condensate, in particular to a device for separating low-molecular condensate and gas in a vacuum system of a twin-screw extruder. Background technique [0002] Twin-screw extruder is a common equipment for polymer modification processing, and has been widely used in polymer blending, filling and reinforcement modification, as well as special reactive extrusion modification. The twin-screw extruder is the key equipment in the production of polyethylene film, which mixes, melts and transports the formula materials. [0003] In the prior art, such as in the application CN107696452A, a steel wire mesh is set in a vacuum tank to condense low-molecular substances on the screen. However, the area of ​​the steel mesh is limited. When the opening of the steel mesh is too large, a large amount of low-molecular substances will enter through the opening. The vacuum pump will block the vacuum pump....

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Problems solved by technology

[0003] In the prior art, such as in the application CN107696452A, a steel wire mesh is set in a vacuum tank to condense low-molecular substances on the screen. However, the area of ​​the steel mesh is limited. When the opening of the steel mesh is too large, a large amount of low-molecular substances will enter through the opening. The vacuum pump will block the vacuum pump. Otherwise, if the opening is set smaller, the low molecular substances condensed on the wire mesh will soon block the wire mesh, and the vacuum tank needs to be changed frequently for cleaning, which is time-consuming and laborious.

[0004] During the melting and conveying process, some gas volatiles and low-molecular condensate will be produced. If these gas volatiles and low-molecular condensate follow the material to the die, it will easily lead to uneven thickness and even voids in the polyethylene film. , and because the material must maintain a vacuum mode during the production process, a vacuum device must be installed on the twin-screw extruder to extract these gas volatiles and low-molecular condensates. If vacuuming, the exhaust port of the twin-screw extruder If it is directly connected to the vacuum pump, a large amount of low-molecular condensate will be pumped into the vacuum pump, causing the vacuum degree to deteriorate and the impeller of the vacuum pump to be stuck.

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