How to ensure the stability of the printing quality, especially when the printing is processed in different printing machines, different batches and different operators, can ensure that the quality indicators of the printed products such as color, level and clarity are always consistent, relying on traditional manual detection And monitoring has become increasingly difficult to meet the needs, regardless of monitoring reaction speed, quality accuracy and process variability, there is an urgent need for online color control systems.
For more than 20 years, printing companies have been using measurement and control technology to obtain faithful manuscripts and stable quality printing results. Among them, color density measurement and ink control systems have played an important role.
Density measurement plays an indispensable role in the color detection of printed sheets. Because the density of the ink film on the surface of the substrate can be measured optically, the color control system is used to determine whether the measured area should reduce or increase the amount of ink. It can target the problem area through a complex control algorithm to finally realize the ink dispensing device Accurate ink key switch operation, so that the ink is supplied to a specific area accordingly, to obtain the desired color effect on the printed sheet.
Because the density value is closely related to the thickness of the ink film on the printed sheet. In multi-color overprinting, in the common printing ink film thickness range (as small as one thousandth of a millimeter), there is a nearly linear relationship between the density value and the ink film thickness. Therefore, the density value is very suitable for measuring and controlling the ink film thickness on the printed sheet.
The automatic control of the ink key makes the work of the operator easier. The operator only needs to take samples at intervals to measure and confirm whether the color of the printed sheet meets the recommended control value. The measurement of ink during the operation of the machine is left to the control program to complete, and the quality of the production operation is recorded by statistical evaluation to the whole process. The important ink film thickness control ensures the stability of the printing process. In the printing process, once a certain printing effect is reached, the density control can effortlessly maintain stable printing quality.
Packaging and printing has very high requirements on the color appearance of printed products. According to the requirements of customers or products, usually a large area of ​​spot color must be measured. The density value cannot completely determine the accuracy of the ink, such as whether the hue of the color is correct. Moreover, due to the different substrates actually used, the same amount of ink supply will also produce different visual effects on the printed sheet, such as the thickness, absorbency and apparent color of the substrate. The chromaticity measurement system is a measurement and evaluation system that imitates the visual impression of the human eye and objectively evaluates printed sheets.
The printing industry has used colorimetry to evaluate printing quality for several years. This method is usually used in conjunction with the standardization and color management of all process steps in the digital production process. Because the final color effect can be better determined through chroma analysis, especially for spot color printing, making chroma measurement particularly important in more complex printing types, such as packaging printing.
Complementing density measurement with chromaticity measurement is the ideal solution. It has high-precision measurement and control based on ink density. It can use independent sensing technology to perform spectral measurement on color patches under the same measuring head. It has the important characteristic of combining chromaticity measurement value with density control process.
Therefore, the current online color control system is a close combination of density measurement, chromaticity measurement and ink supply control of the printed image, and online real-time detection and control is achieved, so that the printing quality control has reached closed-loop control, which truly achieves detection and control The real-time response has greatly improved printing efficiency, reduced printing loss, smooth printing process and stable printing quality.
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