A film thickness control system and bolt self-positioning method based on bolt self-positioning

Abstract

The invention discloses a film thickness control system based on bolt self-positioning and a bolt self-positioning method. The film thickness control system comprises an extrusion unit, a cooling forming unit, a stretching unit, a thickness measuring unit, a monitoring control unit and a winding unit, The monitoring and control unit includes an acquisition module, a processing module, and a control module. The acquisition module transmits the film profile thickness curve data to the processing module. The processing module calculates and obtains the film thickness and estimates the position of each bolt of the extruder die head. Processing to reduce the estimation deviation, the control module adjusts the thickness of the film in the longitudinal direction and the transverse direction through the frequency converter and the die head adjuster respectively. The invention can quickly self-position the die head bolts, the adjustment action is small in the positioning process, and the influence of long-term bolt heating on normal production is avoided, and the accurate bolt positioning can avoid the problem that the thickness deviation is difficult to zero in the BOPP film manufacturing process , so that the thickness of the film in both transverse and longitudinal directions is highly consistent.

Description

technical field [0001] The invention relates to the technical field of film manufacturing, in particular to a film thickness control system based on bolt self-positioning and a bolt self-positioning method. Background technique [0002] BOPP film, that is, biaxially oriented polypropylene film, is made by biaxially stretching. It is a plastic product that is specially formed and processed by physical, chemical and mechanical means. BOPP production line is a nonlinear complex system. Its technological process mainly includes: raw material melting, extrusion, cooling forming, longitudinal stretching, transverse stretching, trimming, corona treatment, coiling, etc. [0003] The physical and mechanical properties such as tensile strength, elongation at break, turbidity, gloss, etc., which are the quality indicators of BOPP film products, are mainly determined by the properties of the material itself, so they are easy to meet the requirements. As the main control indicators of ...

AI Technical Summary

Problems solved by technology

These two methods require manual auxiliary identification, measurement and judgment according to the actual production situation. Manual judgment is not only inaccurate, but also unstable.

Due to the lack of continuous and accurate positioning of the film profile, the thickness control effect of the film and the quality of the produced products are often affected

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