A film thickness measurement auxiliary positioning method

Abstract

The invention discloses a film thickness measurement auxiliary positioning method. The film thickness measurement auxiliary positioning method comprises the following steps: engraving and printing a slope-shaped mark on a casting piece which is cooled and moulded after being extruded by an extruding machine by using an engraving and printing unit in an executing mechanism; after an acquisition module acquires thin film profile thickness curve data from a thickness measurement instrument, processing the thin film profile thickness curve data by an analyzing and processing module, and realizing start synchronization with scanning of the thickness measurement instrument; later, transmitting command information to an intensity adjusting module and a focus adjusting module through the analyzing and processing module and to a driving module through a synchronizing module periodically, controlling the executing mechanism to act to perform auxiliary positioning engraving and printing, and engraving and printing a V-shaped or U-shaped gap mark at a preset position of the casting piece; positioning mould head bolts accurately by capturing extreme points of a thin film profile mark gap. The film thickness measurement auxiliary positioning method can realize the synchronization with the thickness measurement instrument quickly; moreover, the requirements on an engraving and printing amount can be reduced through the synchronization; the mark acquired after auxiliary positioning is performed has a number pair set of thin film profile thickness values of all mould head bolt positions; real-time basis is provided for the control of thin film thickness.

Description

Technical field [0001] The invention relates to the technical field of thin film manufacturing, in particular to an auxiliary positioning method for film thickness measurement. Background technique [0002] BOPP film or biaxially oriented polypropylene film is made by biaxial stretching. It is a plastic product that is specially formed by physical, chemical and mechanical means. The BOPP production line is a complex system with nonlinear, time-varying and large delay. The process flow mainly includes: raw material melting, extrusion, cooling forming, longitudinal stretching, transverse stretching, trimming, corona treatment, coiling, etc. [0003] The physical and mechanical properties of BOPP film products, such as tensile strength, elongation at break, turbidity, gloss, etc., are mainly determined by the properties of the material itself, so they can easily meet the requirements. As the main control index of reworkability and usability, that is, film thickness deviation and fil...

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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