How to solve the dissolving ink and whitening when printing with black ink

Because any packaging needs to print barcodes, black ink has become an indispensable ink in packaging printing, but it is easy to appear "dissolved ink" and "whitening" when gravure black ink, the solution is attached to this article .

Unexpected problem

Black ink "melting ink" means that when the same system of ink or varnish is overprinted with black ink, the edge of the image printed by the black ink will be blurred, and this blurred phenomenon will be pulled under the action of the scraper Long, resulting in waste products, especially when varnish and black ink are overprinted, it is easier to produce black ink "melt ink" phenomenon, because the same solvent as black ink in varnish will have a certain dissolution effect on black ink.

There are three main reasons for the "whitening" phenomenon:

First, the blackness of the ink itself is not enough; second, there is a certain problem in the proportion of the basic color used by the ink manufacturer when producing black ink. For example, in order to save costs, the yellow, magenta, and cyan basic colors are used to modulate the black 50% of the finished black ink is added to the ink; the third is that the printing volume of the black ink is too large, and the number of repeated ink reuse is too many.

solution

Appropriately change the black ink system to make the system change with the ink superimposed on it. For example, when using ester-soluble varnish and ester-soluble black ink, benzene-free black ink can be added to the ester-soluble black ink at a ratio of 2: 1 Alcohol soluble black ink, so that the system of black ink and varnish are different, thus eliminating the phenomenon of black ink "dissolving ink". This method is also suitable for the "whitening" phenomenon, and the effect is very good.

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