Preparation process of three-layer plastic coextrusion-lamination film

Abstract

The invention discloses a preparation technology of three-layer plastic co-extrusion composite film, comprising the preparation steps as follows: (1) pre-heating process; (2) material falling process; (3) the starting of an upper traction device; (4) cooling process; (5) extruding process; (6) the starting of a lower traction device; (7) the adjusting of the size specification of the film; (8) roll-up process: carrying out the roll-up operation by utilizing a roll-up machine; (9) corona treatment process: starting an electric corona machine to carry out the corona treatment. The three-layer plastic co-extrusion composite film prepared by the preparation technology has high strength and good barrier property and air-tightness; meanwhile, different colours can be adopted, and the shading property and the fresh-keeping capability of the film are effectively improved.

Description

technical field [0001] The invention relates to the technical field of plastic co-extruded composite films, in particular to a process for preparing a film plastic bag composed of three-layer co-extruded composite films. Background technique [0002] In the prior art, the application of plastic films is becoming more and more extensive. Usually, different materials such as high and low pressure polyethylene, linear low density polyethylene and EVA are extruded through a single-layer die to form a single-layer film, but the single-layer film In the production process, only one extruder is generally used, and only a single material is used in the extruder. The single-layer film produced in this way has poor physical properties, low strength, and relatively high barrier and air tightness. Poor, and at the same time no good shading performance and fresh-keeping performance. Contents of the invention [0003] The purpose of the present invention is to overcome the deficiencies...

AI Technical Summary

Problems solved by technology

[0002] In the prior art, the application of plastic films is becoming more and more extensive. Usually, different materials such as high and low pressure polyethylene, linear low density polyethylene and EVA are extruded through a single-layer die to form a single-layer film, but the single-layer film In the production process, only one extruder is generally used, and only a single material is used in the extruder. The single-layer film produced in this way has poor physical properties, low strength, and relatively high barrier and air tightness. Poor, but no good shading performance and fresh-keeping performance

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