Continuous production process of polyethylene (PE) breathable film

Abstract

The invention discloses a continuous production process of a polyethylene (PE) breathable film. By the continuous production process, granulation and dehumidification flows in the conventional production process of the PE breathable film are eliminated. The production of the PE breathable film from a raw material to a finished product is finished on a production line, so the production process provided by the invention has the advantages of energy conservation, high efficiency, low cost and high quality. The production process of the PE breathable film comprises the following steps of: mixingmaterials; mixing and plastifying to form a melt; pressurizing and stabilizing the melt; filtering out impurities; extruding to form a film; cooling to form the film; pre-heating a base film; stretching the base film; heating, cooling and setting; detecting thickness; and rolling to obtain the PE breathable film. An extruder which only has a feeding section and a metering section and a melt pressure-stabilizing device are arranged between an evacuation section of a mixing roll and a mould head on the production line, so the continuous production of the PE breathable film is realized.

Description

technical field [0001] The invention relates to the technical field of breathable film production technology, in particular to a continuous PE breathable film production process. Background technique [0002] The conventional production process of PE (polyethylene) breathable film is to heat and knead polyethylene with a weight percentage of 44.5-54.5%; 45%-55% calcium carbonate; 0.5% additives (lubricant and antioxidant) through a mixer. Calcium carbonate is evenly dispersed in polyethylene, then formed into air-permeable particles, and then sent to the extruder, heated and plasticized, extruded through a T-shaped die to form a film, and then heated to an appropriate temperature and then properly stretched and shaping, and then rolled up to make a PE breathable film. In this process, since calcium carbonate is evenly distributed in PE, when it is formed into a film and then heated and stretched, there is a gap between the calcium carbonate particles and the PE. Voids, thes...

AI Technical Summary

Problems solved by technology

Afterwards, the air-permeable particles are transported to the PE air-permeable film production line of another factory, and then heated from room temperature to 240-250°C to be extruded into a film, and cooled to room temperature to form a film. In this way, the raw material is reheated and the energy consumption is high. multiply

In addition, due to the complexity of the granulation process, the energy consumption will also increase

[0012] (2) High packaging cost

[0013] (3) Affect the quality

Because the raw material is reheated, its main performance indicators such as tensile strength and elongation decrease, and because during the granulation process, the granulation needs to be cooled, the drying needs to be heated by hot air, and the dehumidification also needs a process of heating first and then cooling. Therefore, the process is complicated and the quality is difficult to guarantee

[0014] (4) Due to many processes, the efficiency is low, the equipment occupies a large area, the investment increases, and the cost increases

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