Secondary supplementary engraving method in gravure plate making

Abstract

The invention relates to a secondary supplement engraving method in gravure plate-making. The method includes steps in sequence as follows: (a) determining a horizontal engraving-starting position of a roller, namely, installing a roller which needs supplement engraving onto an electric engraving machine, and moving an engraving needle so as to coincide the engraving needle with the center of the first horizontal grid of a tentative engraving block; (b) determining a circumstantial engraving-starting position, namely, adjusting the distance between the engraving needle and the first horizontal grid of the tentative engraving block so that the distance is the same as a distance between the engraving needle and the first horizontal grid of a tentative engraving block of an original roller; and (c) performing supplement engraving, namely, engraving supplement patterns to be supplemented in the roller which needs supplement engraving. According to the method, the engraving needle is moved so as to coincide the engraving needle with the center of the first horizontal grid of a tentative engraving block, and the distance between the engraving needle and the first horizontal grid of the tentative engraving block is adjusted so that the distance is the same as the distance between the engraving needle and the first horizontal grid of the tentative engraving block of the original roller, thus accurately determining the position of secondary supplement engraving, avoiding leaks and pattern overlap, reducing the rework rate, saving the cost and the time, and shortening the product delivery time.

Description

technical field [0001] The invention belongs to the gravure printing industry, and in particular relates to a secondary supplementary engraving method in gravure plate making. Background technique [0002] There are many plate-making methods used by many domestic plate-making manufacturers. There are three main processes: 1. Electronic engraving process; 2. Laser engraving and post-corrosion treatment process; 3. Laser direct ablation plate-making process. Among them, electronic engraving has the advantages of low engraving cost, high engraving frequency, high and stable engraving quality, and wide application range. It is widely used and plays a leading role in gravure plate making. The electronic engraving process is a production process in which the image is engraved onto the gravure roll by the electronic engraving machine. It first inputs the data of the image file into the control system of the electronic engraving machine and sets the engraving parameters at the same ...

AI Technical Summary

Problems solved by technology

Since the image has rich color level changes, there are large color blocks with high density of darker colors and soft transition layers of lighter colors. When engraving a color plate of image data, the unified parameters Unable to perfectly show the mesh holes of different depths and thicknesses at the same time

For example, if you set the engraving parameter to a value suitable for a large color block, you can engrave a larger cell, showing the saturation and three-dimensional effect of a large color block, but the depth of the cell at the transition level will be relatively deep, so that , the level of delicacy of the image after printing will decrease, and the lines and outlines will be rough; on the contrary, if the engraving parameters are set to a value suitable for the transition level, although very precise small cells can be engraved, it will show the delicacy and fineness of the transition level. Outline, but the large color block area will be relatively shallow, losing saturation and three-dimensionality