Gravure printing machine and its scraping device

Abstract

The invention discloses a photogravure press and a squeegee device thereof, belongs to the field of photogravure presses, and aims to provide a photogravure press squeegee device which can overcome the defect that ink stored in sunken image-text areas is blown away when ink on the surfaces of printing rollers is removed through an air blowing method. According to the technical scheme, the photogravure press squeegee device is characterized in that the squeegee device comprises an imprinting roller and a printing roller; an ink plate is arranged under the printing roller; an air blowing barrelconnected with an air blower is arranged on one side of the printing roller; an air flowing channel is formed in the side wall, facing the printing roller, of the air blowing barrel; the air flowing channel is formed in the tangential direction of the printing roller; the air outlet direction of the air flowing channel is opposite to the line speed direction of the position, close to the air flowing channel, of the printing roller; a plurality of partition plates are evenly distributed in the air flowing channel in the axial direction of the printing roller; the air flowing channel is dividedinto a plurality of air chambers through the partition plates; insertion grooves are formed in the positions which are located on the sides, away from the printing roller, of all the air chambers, ofthe joint of the air flowing channel and the air blowing barrel; and arc-shaped insertion plates are arranged in the insertion grooves.

Description

technical field [0001] The invention relates to the field of gravure printing machines, in particular to a gravure printing machine and a scraping device thereof. Background technique [0002] A gravure printing machine is a machine that uses gravure plates for printing. The graphic part of the printing plate is sunken, and the blank part is on the same plane as the outer circle of the printing plate cylinder. By applying ink to the concave part of the printing plate, using a doctor blade or other methods to remove excess ink, and then under the action of printing pressure, the ink is transferred to the substrate to complete the printing process. Gravure printing has clear layers, thick and bright ink layer, uniform ink color, can truly reproduce the effect of the original manuscript, and the printing speed is fast. It is one of the most widely used printing methods at present. [0003] The inking devices of the gravure printing machine mainly include immersion type, ink t...

AI Technical Summary

Problems solved by technology

The way that this scraping device uses air blowing to blow off excess ink on the surface of the printing plate cylinder has the following disadvantages: blowing air towards the printing plate cylinder can indeed blow off most of the ink on the surface of the printing plate cylinder, but due to the viscosity of the ink and the Under the action of its internal tension, a layer of ink film will remain on the surface of the printing plate cylinder, which will cause undesired lines on the printed matter and affect product quality; moreover, blowing air towards the printing plate roller brush will also remove the sunken pattern. The ink stored in the text part is blown away, resulting in white spots and missing printing in the graphic part of the product

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