A device and method for detecting surface defects of printed matter

By combining a color difference detection mechanism and a multispectral component, the surface defect detection device for printed materials solves the problem of difficult surface imaging in hot stamping, UV embossing, and other processes, and achieves high-precision detection of embossed and concave printing position and color deviation.

CN122109141APending Publication Date: 2026-05-29TAIZHOU TIANGE PAPER PRODUCTS CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
TAIZHOU TIANGE PAPER PRODUCTS CO LTD
Filing Date
2026-04-13
Publication Date
2026-05-29

AI Technical Summary

Technical Problem

Existing technologies struggle to image surfaces with strong specular reflection and low texture contrast, such as hot stamping and UV embossing. Furthermore, paper deformation or misalignment can lead to misjudgments in template comparison. Laser detection is prone to failure in highly reflective areas and lacks physical verification.

Method used

The test chamber employs a color difference detection mechanism, a pattern detection mechanism, an embossing positioning mechanism, and a multispectral component, combined with a color line array camera, a laser triangulation system, and multispectral analysis, to achieve high-precision detection of the surface of printed materials.

Benefits of technology

It improves the clarity and sensitivity of surface defect detection for printed materials, avoids misjudgments caused by paper deformation and lens distortion, and ensures accurate detection of embossing and debossing position and color deviation.

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Abstract

The application discloses a kind of for printed matter surface defect detection device and detection method, it is related to the technical field of defect detection, including detection box, bottom support mechanism and lifting mechanism are arranged in the detection box, conveying device is arranged in the both sides of bottom support mechanism.The close cooperation of focusing mirror and color line array camera is combined with the collaborative light supplement of light source ring and light band ring, the imaging definition and detection sensitivity of small pattern defects such as burr and broken line on the surface of printing plate are improved;At the same time, the point calibration light transmission ring is lowered synchronously with the bottom support ring, and the preset pattern coordinate point on its surface is used as a spatial reference, so that the color line array camera can be directly aligned and compared with high precision at the actual detection position, effectively avoiding the misjudgment caused by paper deformation, paper deviation or lens distortion.
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