Polypropylene biaxially oriented film production line

Abstract

The invention discloses a polypropylene biaxially oriented thin film production line. The production line comprises a discharging mechanism, a biaxially oriented stretching mechanism and a winding mechanism which are arranged in sequence, a pressure feeding mechanism is arranged between the biaxially oriented stretching mechanism and the winding mechanism, and the pressure feeding mechanism comprises two mounting frames. Two rubber rollers which are matched with each other are mounted between the two mounting frames, the two rubber rollers are distributed up and down, and a driving mechanism for driving the two rubber rollers to rotate oppositely is mounted on one of the mounting frames. Tension is provided for a film through the pressure feeding mechanism to enable the film to be kept tensioned, the film is collected through the winding mechanism capable of adjusting the position of a winding drum according to the tension of the film, the flatness and stability of the film during advancing are further guaranteed through cooperation of the pressure feeding mechanism and the winding mechanism, the tension of the surface of the film is kept constant, and the product quality of the finished film can be improved.

Description

technical field [0001] The invention relates to the technical field of film production, in particular to a polypropylene biaxially stretched film production line. Background technique [0002] Polypropylene, referred to as PP, is a colorless, odorless, non-toxic, translucent solid substance. Biaxially oriented polypropylene film (BOPP) is generally a multi-layer co-extruded film, which is obtained by co-extruding polypropylene particles to form a sheet, and then stretching in both vertical and horizontal directions. Biaxially oriented polypropylene film has the advantages of light weight, non-toxic, odorless, moisture-proof, high mechanical strength, good dimensional stability, good printing performance, good transparency, etc. At the same time, it also has high transparency, good gloss, good barrier properties, High impact strength, low temperature resistance and other advantages. [0003] After retrieval, the Chinese utility model patent with the application number 20182...

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Problems solved by technology

[0004] After the polypropylene film has been biaxially stretched, the flatness of the edge is poor, and the edge of the film needs to be cut. The device of this patent and most of the film winding and cutting equipment at the present stage provide cutting for the film through the guide roller. The tension required when cutting the edge, the stability of the film is poor, resulting in unsatisfactory edge cutting effect, the cutter is not easy to adjust, and the film is prone to wrinkles when it is traveling, which affects the quality of the finished film; in addition, due to the volume of the collected film The cylinder rotates at a constant speed and cannot adjust its own state according to the tension of the film. The film is easy to loosen or cause film breakage and excessive stretching of the film, which has serious disadvantages

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