A Film Thickness Monitoring System Based on Bolt Self-positioning

Abstract

The invention discloses a bolt-based self-positioning film thickness monitoring system, comprising an acquiring unit, a calculating unit, an identifying unit, an adjusting unit and a data outputting unit. The calculating unit is based on the thickness curve data acquired by the acquiring unit to calculate the thickness values of the various points on the curve as well as the positions of the various bolts; the identifying unit searches and identifies the to-be-processed bolts; the adjusting unit adjusts the temperatures of the to-be-processed bolts and then compares the movement of the film thickness zero-deviation point before and after the adjustment, and based on the movement amounts, adjusts the estimated positions for the various bolts. In the system of the invention, through the selection of a group of bolts for thickness adjustment and feedback identification, the thickness of the film can be monitored effectively in real time. And the accurate bolt self-positioning can provide basis for film thickness control and the self-positioning process requires a small action amount.

Description

technical field [0001] The invention relates to the technical field of film manufacturing, in particular to a film thickness monitoring system based on bolt self-positioning. 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 complex system with nonlinear, time-varying and large delay. 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 ...

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 monitoring 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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