Color registration control method of gravure printing machine based on film algorithm

Abstract

The invention discloses a colour register control method based on a film algorithm for a gravure printing machine. The colour register control method comprises the following steps: step S1, obtaining variables related to an error; step S2, constructing a film algorithm framework of a star topological structure; step S3, acquiring data; step S4, constructing a Gaussian process prediction model; step S5, training an artificial neural network in the film algorithm framework, and updating a weight; step S6, calculating a predicted rotation angular velocity of the next period; step S7, inputting the predicted rotation angular velocity into the Gaussian process prediction model of an inner film layer to obtain a predicted rotation angular velocity; and step S8, enabling the predicted rotation angular velocity to act on a controller of the gravure printing machine, and repeating the step S6 and step S7 until a printing process is concluded. The film algorithm in the colour register control method disclosed by the invention has the star topological structure, and can realize adequate exertion of the predication capacities of different data models; and the film algorithm has great robustness and an efficient and accurate predication capacity, and can realize high-accuracy control on colour register of the high-speed gravure printing machine.

Description

technical field [0001] The invention belongs to the field of gravure printing, and in particular relates to a method for controlling color registration of a gravure printing machine based on a film algorithm. The method can realize precise control of color registration errors by predicting the rotational angular velocity of a plate roller of the gravure printing machine. Background technique [0002] The color registration accuracy of the gravure printing machine is one of the most important indicators to measure the quality of printed products, and has been widely concerned. The high-speed and high-precision color registration error control is the focus in recent years, and it is also the development direction of the gravure printing industry. [0003] Traditional gravure printing machine color registration control methods are mainly PD, PID, and some methods of adding feed-forward controllers. This type of method has a certain effect on reducing the color registration erro...

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Problems solved by technology

[0003] Traditional gravure printing machine color registration control methods are mainly PD, PID, and some methods of adding feed-forward controllers. This type of method has a certain effect on reducing the color registration error caused by coupling, but due to the large time Due to the delay characteristic, the effect of this kind of control method is limited, and it is difficult to meet the requirements of high rotational angular velocity and high precision.

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