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The degree of automation in the modern printing industry is getting higher and higher, and the printing speed and printing quality are greatly improved. The online control of printing quality is critical to printing process management, rejecting and improving printing quality. At present, most of the domestic printing quality is detected by the human eye offline. The smallest defect that the human eye can detect needs at least 20 gray levels and the size is not less than 0.3 mm, but it is difficult to maintain continuous and stable, and it is easy to produce fatigue. If a problem is found in the offline inspection, the high-speed printing machine has produced a large amount of waste products, resulting in a waste of printing materials and man-hours, and low production efficiency. Therefore, the online quality inspection of printed materials came into being.
1. Online detection technology of printed matter
On-line detection technology of printed matter is to detect printed matter online with the help of online detection instruments during the printing process, and to transmit the information to the central console in real time through the feedback loop, so as to automatically adjust the corresponding printing machine components and achieve online control of the printing quality , Automatically detect printed products.
Second, the advantages of online detection technology for printed products
The online detection of printed matter is a fully automatic detection method suitable for high-speed printing formed by combining image processing technology and printing principles. Its advantages are mainly manifested in the following aspects:
â‘ Able to detect very small defects. Online inspection can easily find defects with a size of 0.1mm, and only one gray level difference is needed.
â‘¡ Will not damage the printed matter. The online monitoring uses a camera as a sensor, which will not contact with the printed matter, so it will not damage the surface quality of the printed matter.
â‘¢Improved production efficiency. Online testing can be continuously tested for a long time, and will not cause false detection due to fatigue. At the same time, when quality defects occur, the operator can solve the problems in the work in time according to the real-time report on the spot to reduce the scrap rate, and the manager can also track the production process based on the analysis report of the test results to improve Management benefits.
â‘£Full process: suitable for printing processes such as offset gravure, laser, bronzing, holography, fluorescence, watermark, etc.
⑤ The application of online detection system can also reduce the labor intensity of workers and improve working conditions.
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