Film thickness control system based on self positioning of bolt and self-positioning method of bolt

Abstract

The invention discloses a film thickness control system based on self positioning of a bolt and a self-positioning method of the bolt. The film thickness control system comprises an extrusion unit, a cooling forming unit, a drawing unit, a thickness measuring unit, a monitoring control unit and a winding unit, wherein a collection module, a processing module and a control module are arranged in the monitoring control unit, film section thickness curve data are transmitted to the processing module by the collection module, the film thickness is calculated and obtained by the processing module, additionally, the position of each bolt of an extruder die is estimated, the estimation deviation is reduced by self-positioning processing, and the control module is used for adjusting the longitudinal thickness and the transverse thickness of a film by virtue of a frequency changer and a die adjuster. According to the film thickness control system, the bolt of the die can be quickly positioned by self, and the adjustment is less during positioning, so that the influence of long-time bolt heating on normal production is avoided, and the problem of difficulty in returning to zero of the thickness deviation of a BOPP (Biaxially-oriented Polypropylene) film can be avoided during manufacturing by accurate positioning of the bolt, so that the transverse thickness and the longitudinal thickness of the film are kept 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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