Printed version and paste version analysis - ink roller and water roller
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1) Inker roller and water roller roller head wear deformation or bearing damage. When the shaft head of the ink roller or the water roller is worn due to poor lubrication, and the bearing is damaged, on the one hand, due to the occurrence of a jumping and sliding phenomenon, the plate surface constitutes an abnormal friction, thereby destroying the ink-receptive and hydrophilic basis of the plate. On the other hand, due to the uneven rotation of the rollers, the uniform layout, sufficient ink supply, and water supply are affected, which can easily result in the occurrence of stencil and stencil printing.
2) Applicator roller colloid is hard or aging. If the roller is colloidally stiff or the surface is cracked and aged, one will increase the friction on the plate surface; the other is that the ink will slide easily during the inking process; and the third is the decrease of the ink's adsorption performance, and it cannot maintain good The effect of inking will inevitably affect the uniform and normal ink supply on the layout, thereby increasing the chance of missing the version.
3) The ink roller or the water roller has eccentricity. When the roller body of the ink roller or the water roller appears eccentricity, during the rolling process, the frictional force of the large radius facing the printing plate layout increases, so that the printing plate film layer is damaged, and it is easy to cause the plate off, Paste phenomenon occurs.
4) Water roller aging. When the water roller is used for aging or pile fluff wear, and the water roller with ink, impurities, etc., will affect the water roller's normal water absorption and water transfer performance. Then, under the condition that the water supply is not normal, the hydrophilic film on the plate easily absorbs the ink and expands the ink on the edges of the characters, lines or dots to form a paste phenomenon.
Source: "Printing World" Author: Kai Kang
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