Flexible plate printing machine with accurate color register and control method

Abstract

The invention relates to the technical field of flexible package printing, in particular to a flexible plate printing machine with accurate color register. The flexible plate printing machine comprises an unwinding component used for feeding a to-be-printed coiled material; a printing component used for printing ink on a printing material supplied by the unwinding component; a winding component used for winding the printing material printed by the printing component; and a controller, wherein the printing component comprises at least two printing units which are linearly arranged in spatial distribution. The printing units are arranged in a distributed mode, tension isolation roller sets are arranged to limit the change of the tension of the printing materials in the printing units, the output ends of the printing units are connected with tension monitoring components, and the conveying speed of the tension isolation roller sets to the printing materials is adjusted in real time through tension feedback; and the printing materials in each printing unit are controlled to be subjected to transfer printing and color register with the same tension, so that the materials do not deform during color register, and accurate color register in each printing unit is ensured.

Description

technical field [0001] The invention relates to the technical field of flexible packaging printing, in particular to a flexographic printing machine with accurate color registration and a control method. Background technique [0002] At present, the printing machine mainly includes a roll feeding part, a feeding traction part, a printing part, a receiving traction part and a winding part. [0003] Generally, the printing part of multi-color printing includes multiple printing units, especially in the multi-color printing process of flexible printing materials, flexible printing materials (such as packaging films) are deformed due to external forces such as stretching, compression, friction, etc. When the deformation is reflected in each printing unit, defects such as overlapping, displacement, and deformation of each color pattern appear (combined with figure 1 shown). [0004] The printing part of the satellite flexo printing machine includes a central cylinder with a lar...

AI Technical Summary

Problems solved by technology

Expensive and difficult to repair and maintain

[0007] In terms of production: due to the large size of the central cylinder, the position of the printing unit and the central cylinder is relatively fixed, the number of color groups cannot be increased and the number of color groups can only be reduced, and it is difficult to replace the plate rollers; the distance between the printing units is small, and it is not easy to set the drying separately Drying mechanism, the ink is not easy to fix. Generally, a high-power drying mechanism is installed at the winding place. Even if only a small number of colors are overprinted, it still requires a large power consumption; due to the large size of the center cylinder and high driving power, further This leads to high energy consumption; in addition, the operating space for workers is limited, and it is difficult to find out in time when there is a problem with color registration or printing quality; each printing unit is connected in series around the central cylinder. When the central cylinder fails, the line needs to be stopped for maintenance, and the degree of continuous production is low. , low error tolerance

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