On the importance of printing quality process control to printing
The ultimate goal of printing quality process control is to allow companies to improve product quality and ensure the continued stability of product quality. For printing companies, improving the stability of products requires not only corresponding quality monitoring measures and corresponding management systems, but also technology, means and related equipment for process control. With the development of multi-color printing and its higher and higher degree of automation, the printing speed and printing quality requirements have been greatly improved. The quality process control of the printed materials has been applied to the management of the printing process, the correct use of printed materials, reduced material costs and increased labor per unit time Effective, thereby improving the quality of printed products, reducing subsequent waste and improving the rate of finished products. At present, the pre-press link can basically realize the digital process control, and the post-press can basically control the production quality through the inspection machine. However, the most important printing link can still only achieve the ink volume through the CP window and operation keys. Control and registration of mediation and other operations to achieve. Most printing companies control the printing quality in the printing process through manual sampling and detection by the human eye, and the smallest defect that the human eye can find needs to have at least 20 gray levels and the size is not less than 0.3 mm, but It is difficult to maintain a sustained and stable, and people are prone to fatigue, especially in the night shift, it is more prone to a large number of print quality problems. The so-called print quality process control system refers to the use of cameras to replace human eyes and control systems to replace human brains in the printing process. Its working principle, through the image acquisition unit (such as: CCD camera lens), first through the image acquisition of qualified products to remove the influence of random factors, to obtain the standard image of the printing layout as a template, and then real-time printing in the printing process Collect the printed products, and transmit each collected image to be tested to the control system for comparison and analysis with the standard image. If the difference is found and exceeds the set tolerance range, it is judged as a non-conforming product, and finally by adjusting the corresponding printing Components or auxiliary materials to repair the related quality problems, effectively reduce or prevent the occurrence of batches of failures, causing unnecessary waste. Advantages of printing quality process control Printing quality process control is a fully automatic detection method suitable for high-speed multi-color printing formed by combining image processing technology and printing principles. Its advantages are mainly manifested in the following aspects: 1. Able to detect subtle defects. Including less characters, ink drawing, flying ink, color difference, missed printing, dirty dots, overprint deviation, etc. 2. Will not damage the printed matter. The online detection and measurement uses a camera as a sensor; it will not contact with the printed matter, so it will not damage the surface quality of the printed matter. 3. Improve 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. 4. The application of online detection system can also reduce the labor intensity of workers and improve working conditions. The enterprise has a good and sustained and stable development for a long time, and must have a reasonable and perfect quality management system. Online control of printing quality is critical to printing process management, monitoring measures, and timely problem detection to solve problems, thereby effectively improving printing quality. 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