Machine vision is to replace human eyes with cameras and human brains with computers. The working principle of machine vision for printing and packaging quality inspection is also very simple. Use the camera to capture (collect) the image of the printed product and compare it with the standard image (template) of the printed product in the computer. Scope, that is determined to be unqualified products. Of course, the actual machine vision system is much more complicated.
1. Online detection and offline detection
The visual inspection system can be divided into an online inspection system and an offline inspection system according to the carrier on which it is installed.
The online detection system is installed on printing equipment such as offset presses, gravure presses, flexo presses, code printers, etc., to detect print quality in real time. The printed product can be a single sheet of paper or roll paper. The visual inspection part of the online inspection system and the offline inspection system are basically the same in function, and the main difference is the processing method of the defective product. When a defect is found, the online inspection system usually records the position of the defect (length: web, number of sheets: single sheet), or uses a printer, labeling machine, marking machine to make marks on the edge of the paper, number Detect and record the wrong number or the number of adjacent sheets.
The offline inspection system is usually installed on the inspection machine or rewinding machine. In addition to the position recording and marking functions of the online inspection system, the inspection machine usually has a warehouse function, which automatically distributes good and bad products into different warehouses according to the inspection results.
2. Quality analysis, tracking and management
The use of testing equipment for quality testing can provide real-time alarms and detailed and complete analysis reports throughout the testing process. The on-site operator can adjust the problems in the work according to the real-time alarm and analysis report of the automatic detection equipment. The manager can track the production process based on the analysis report of the test results, which is more conducive to the management of production technology. Because what customers demand, high-quality testing equipment is not only to detect the quality of the printed matter, but also requires the ability to analyze afterwards. Some quality testing equipment can not only improve the pass rate of finished products, but also assist manufacturers to improve the process flow, establish a quality management system, and reach a long-term stable quality standard.
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