Film thickness monitoring method for bopp film production

Abstract

The invention discloses a film thickness monitoring method for BOPP film production, and the method comprises the steps: collecting a film profile image outputted by a film thickness measurer, obtaining the reference thickness value, coordinate scale value and mean thickness value of an original film thickness curve in the image according to the image, generating a continuous complete non-crossed film thickness curve according to the image, calculating the thickness value corresponding to each point on the curve, outputting or displaying the thickness values according to the requirements of an object which receives the thickness values, and giving an alarm when a thickness value exceeds a preset range. The method can avoid the analysis of a specific data format of the thickness measurer, accurately obtains the thickness data, achieves the real-time automatic monitoring of the thickness of a film profile, effectively avoids the misjudgment of manual monitoring, and provides the fundamental basis for the control of the thickness of the film. Moreover, the method can be easily popularized to other similar equipment, and is good in expansibility.

Description

technical field [0001] The invention relates to the technical field of film manufacturing, in particular to a film thickness monitoring method for BOPP film production. 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 of rew...

AI Technical Summary

Problems solved by technology

Faced with this problem, some manufacturers can only use open-loop control, that is, manually monitor the section thickness image output by the thickness gauge on the display, and then operate the replaced control equipment to adjust according to experience.

[0005] Manual monitoring is not only imprecise, but also unsustainable

Due to the lack of continuous and accurate monitoring of film thickness, the quality of film products is often affected

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