The on-line scanning and guiding technology is a kind of automatic detection and control method suitable for high-speed printing, combining the scanning and inspection technology of printing sheets and the printing quality control technology.
The advantages of this technology are mainly reflected in the rapid and accurate on-line detection, replacing the repeated process of drawing, measurement and control of the original sheet by closed-loop measurement and control, and greatly reducing the time required for the printed sheet to reach the target density value; the quality assessment of the on-line inspection system is independent. In the operator's subjective judgment, the quality control function is implemented more quickly and conveniently during the operation. At the same time, when the quality defect of the printed sheet is found, the operator can solve it at the scene in time to ensure the stability of the printing quality. The manager can also follow the detection results to track the production process and improve the management efficiency.
The online print scanning guide control technology combines the LED flash illumination with the standard RGB polarizing filter to measure the print quality control strip on the print sheet and collect the color information of all the printing ink areas, measuring up to 7 colors. Then the information to be checked collected on the printing production line is transmitted to the system, and the standard color information preset in the system is compared and analyzed to check whether the color value of the printed sheet is correct. Finally, the operator or system automatically adjusts the printing ink supply to achieve on-line quality control of printed sheets.
With the development of detection and guidance technology, printing color and registration have been integrated into a complete online scan scan guidance system, enabling on-line color measurement without the need for manual sampling to enable the measurement and control of printed sheet quality, greatly reducing the Color registration and school time. At present, the detection time of the 740mm×1040mm format sheet only needs 3 sheets to complete the inspection, and the correction of ink volume in the ink area takes only a few seconds. The automatic online print scanning guide system can help printing companies greatly improve the printing efficiency and bring considerable economic benefits.
The above content is excerpted from the "Printing Technology Packaging and Decoration" of the printing and packaging company in the 16th issue of 2012. For more journal content, please pay attention to the journal channel, and click on the latest journal content to enter the channel of the Electronic Journal of the CRINet.