A Film Thickness Control System Based on Marking Assisted Positioning

Abstract

The invention discloses a film thickness control system based on stamp mark auxiliary positioning. The film thickness control system comprises a monitoring control unit composed of a collecting module, an auxiliary positioning module, a processing module, a control module and the like. Under the instruction of a processing unit, an intensity adjusting part, a focusing part and a drive part in the auxiliary positioning module jointly control an executing mechanism to act, and a stamping subunit stamps a V-shaped or U-shaped notch mark at a preset position of a cast slice; and based on data collected by the collecting module, the processing module carries out calculation to acquire the film thickness and the positions of bolts of a die head of an extruder, and a frequency converter and a die head adjustor control the rotating speed of the extruder and the opening degree of the die head correspondingly. By means of mark stamping and section data processing, thickness parameters are obtained through analysis treatment, the bolts of the die head can be rapidly and accurately positioned, the uniformity of the transverse thickness and the longitudinal thickness of a film is achieved by adjusting the opening degree of a lip and the extruding speed, and the stamping amount needed in the auxiliary positioning process is little.

Description

technical field [0001] The invention relates to the technical field of thin film manufacturing, in particular to a film thickness control system based on marking auxiliary 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 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 reworkability and usab...

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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