Overprinting method, device and system for unit type flexographic printer and computer readable medium

Abstract

The invention provides an overprinting method, device and system for a unit type flexographic printer, and a computer readable medium. The overprinting method for the unit type flexographic printer includes the steps of sequentially printing wedge-shaped color codes in different colors on a printing material by using at least two printing units included in the unit type flexographic printer, wherein the width, in a first direction, of a color code image between a rising edge and a falling edge in each wedge-shaped color code changes monotonously in a second direction; respectively detecting the color, the position of the rising edge and the position of the falling edge of each wedge-shaped color code; respectively determining the longitudinal deviation and the transverse deviation of eachwedge-shaped color code according to the positions of the rising edge and the falling edge of each wedge-shaped color code; and for each wedge-shaped color code, determining the printing unit for printing the wedge-shaped color code according to the color of the wedge-shaped color code, and adjusting the position of a printing plate roller of the printing unit for printing the wedge-shaped color code in the first direction and the second direction according to the longitudinal deviation and the transverse deviation of the wedge-shaped color code. According to the scheme, the quality of a printed product can be improved.

Description

technical field [0001] The invention relates to the field of printing technology, in particular to an overprinting method, device, system and computer-readable medium of a group type flexo printing machine. Background technique [0002] Unit flexo printing machine is a printing equipment commonly used in label and flexible packaging printing. The unit type flexo printing machine includes multiple printing units, and each printing unit can sequentially print patterns of different colors on the printing material to achieve overprinting, thereby forming the required multi-color pattern on the printing material. In the process of overprinting, it is necessary to adjust the position of the printing plate roller in each printing unit to ensure that each printing unit can overlap and register the graphic printing. [0003] At present, when using a unit-type flexo printing machine for overprinting, automatic overprinting is usually achieved by following the standard overprinting me...

AI Technical Summary

Problems solved by technology

[0004] In view of the current method of realizing overprinting of unit-type flexo printing machines by following the standard overprinting method, only the position deviation of the printing plate rollers in each printing unit in the paper-feeding direction can be detected according to the single-color square mark, and the position deviation of each printing plate roller cannot be detected. Deviation perpendicular to paper feeding direction

Therefore, the existing standard overprinting method can only realize automatic overprinting in the longitudinal direction (direction of paper feeding), but cannot realize automatic overprinting in the horizontal direction (direction perpendicular to the direction of paper feeding), resulting in poor quality of printed products

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