Label Printing Plate Notes

The graphic part of the label printed with the flexographic printing plate is mainly based on the field, lines, texts, etc. The printing materials used are mostly paper, aluminum foil, plastic film, stickers, and the like. When water-soluble or solvent-based inks are used to print absorbent printing materials, after infrared hot air drying, the materials will tend to pull up, which will affect the accuracy of overprinting. Therefore, care must be taken when considering the printing color sequence to avoid such problems.

Color plates containing large areas should be printed as far as possible in the cell behind, because the substrate is infrared-dried after absorbing a large amount of ink, and the soaring change of the field cell is naturally larger than that of other cells. The effect of overprinting in the printing process is also relatively large. If such units are printed after text and lines, more or less will bring certain positive impact on overprinting. If it is necessary to place the field part in the front color group, it can be consciously made a little larger in the up-down direction to make up for the losses caused by the soaring of the printing materials and make overprinting more accurate.

1. Trapping

When making a flexo, a certain amount of trapping is beneficial to print registration, provided the trap size is appropriate. If the trap is set too small or trapping is not done, it will cause misregistration in the printing (dark trapping); if the trap is set too large, a large outline will appear on the edge of the print, affecting the effect. Visual effects, thus affecting the overall effect of the label.

2. Layout Design

Since flexo printing is basically based on web printing, especially the application of seamless sleeve technology, the paper is greatly saved, but some flexographic printers cannot achieve on-line die cutting, or need to undergo subsequent processing (cutting, etc.) In order to produce finished products, it is necessary to fully consider leaving sufficient margin for subsequent processing when designing layouts. We should not consider the paper-saving rate unilaterally and ignore the qualification rate of subsequent processing.