A method and device for detecting die-cutting quality of transparent printed matter

Abstract

The application provides a method and device for detecting the quality of die-cutting of transparent printed matter. The method includes: adjusting the incident angle when the light source enters the printed matter according to the angle of the light source relative to the incident parallel light, the vertical distance between the light source and the printed matter, and the light transmittance of the printed matter, and according to the angle of the light source relative to the incident parallel light Adjust the angle between the central axis corresponding to the lens in the camera and the horizontal plane. After turning on the light source, obtain the image to be inspected. If there is a defect area in the image to be inspected, it is determined that there is a quality problem in the printed matter. Since there is an incident angle when the effective light enters the printed matter, the effective light will have a sharp angle change at the die-cut edge and defect of the printed matter, and this angle change can be clearly reflected in the image to be detected. This method can clearly The die-cutting quality at the junction of the label paper image and the backing paper image can be accurately judged, thereby improving the die-cutting quality detection effect.

Description

technical field [0001] The present application relates to the technical field of printed matter inspection, in particular to a method and device for inspecting the die-cutting quality of transparent printed matter. Background technique [0002] The traditional die-cutting process is a cutting process for the post-processing of printed matter. The printed matter can be made into a die-cutting knife plate according to the pre-designed graphics, and the printed matter is rolled and cut into the required shape according to the die-cutting knife plate under the action of pressure. . [0003] Transparent printed matter is a kind of printed matter that is widely used at present. There are many transparent printed matter, take the fully transparent printed label as an example, the fully transparent printed label requires both the label paper and the bottom paper to be transparent materials, and the die-cutting process is the same as the traditional die-cutting process. Fully trans...

AI Technical Summary

Problems solved by technology

[0006] This application provides a method and device for detecting the die-cutting quality of transparent printed matter, which can be used to solve the problem that the boundary between the label area and the backing paper area cannot be clearly judged in the obtained imaging after the light is vertically incident on the printed matter in the prior art Die-cutting quality, which leads to technical problems of poor detection results

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