Film Thickness Control Method Based on Marking Assisted Positioning

Abstract

The invention discloses an engraving assisted locating-based film thickness control method. Under an instruction of a processing unit, an intensity adjustment part, a focusing part and a driving part in an assisted locating module jointly control an actuator to operate, so as to enable an engraving subunit to engrave a V-shaped or U-shaped gap mark at a preset position of a cast sheet; and based on data acquired by an acquisition module, the processing module calculates the thickness of a thin film and positions of all bolts of an extruder die head, and respectively controls the rotating speed of an extruder and the opening degree of the die head through a frequency converter and a die head adjuster. According to the film thickness control method, by mark engraving and section data processing, a thickness parameter can be obtained via analysis processing, and the bolts of the die head can be quickly and accurately located, so that uniformity of the thickness of the thin film in the transverse and longitudinal directions can be realized through adjustment of the lip opening degree and the extruding speed, and the required engraving amount in an assisted locating process is small.

Description

technical field [0001] The invention relates to the technical field of thin film manufacturing, in particular to a film thickness control method 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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