Research of gradation parameters of digital flexographic printing plates for manufacturing label and packaging products

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Маїк Л. Я., Holubnyk T. S., Kovalskyi B. M. № 2 (57) 43-53 Image Image

Flexographic printing processes are widely used for manufacturing high-quality label and packaging products. It is important to ensure the quality control of all stages of the technological process, starting with the pre-press preparation, and finishing with the quality evaluation of test proofs and circulation imprints. A digital plate Cyrel nyloflex® FAH Digital (Flnt Group, Germany) has been chosen for manufacturing a flexographic plate. The plates with the thickness of 1.14 mm have been chosen, since they are most widely used for manufacturing label and packaging products in narrow-web printing presses. The image recording on the masking layer of nyloflex® FAH Dgtal digital flexographic plates can be performed on any laser system designed for manufacturing digital flexographic plates. To record an image using laser radiation on a masking layer of a digital photopolymer plate, we use the LaserGraver Fg machine, the features of which are: ergonomics; a fundamentally new system of the image recording and correction; a magnetic drum designed for engraving the plates on a metal base; a thermal method of the image recording using an optical fibre laser with the ability to process each pixel; a convenient system for loading and unloading the material.

The quality evaluation has been carried out using special test scales and a special software and hardware complex like Flexometer. The purpose of this technique is an objective and instrumental quality evaluation, aimed at maximal eliminating the subjective factor, as well as obtaining the numerical characteristics of the quality of plates and masks. The obtained results of the detailed research of screen printing plates enable to evaluate the parameters of graduation transferring of the plating process and to make adjustments of all stages of the technological process.

Keywords: digital photopolymer plates, flexographic printing plate, label and pa­cka­ging products, software and hardware complex, test scale, graduation parameters, quality evaluation.

doi: 10.32403/1998-6912-2018-2-57-43-53

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