How to solve the problem of dissolving ink and whitening when printing Removable Stickers with black ink

How to solve the problem of dissolving ink and whitening when printing Removable Stickers with black ink

Since any packaging needs to print barcodes, black ink has become an indispensable ink in Removable Stickers printing, but it is easy to appear "dissolving ink" and "whitening" when gravure black ink is used. The solution is attached to this article. .

emergencies

Black ink "dissolving ink" means that when the ink or varnish of the same system is overprinted with black ink, the edge of the image and text printed in black ink will be blurred, and this blurring phenomenon will be pulled under the action of the scraper. This is because the same solvent as the black ink in the varnish will dissolve the black ink to a certain extent.

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

One is that the blackness of the ink itself is not enough; the other is that there is a certain problem with the proportion of the basic colorant used by the ink manufacturer in the Removable Stickers production of black ink. 50% of the finished black ink is added to the ink; the third is that the amount of black ink printing is too large, and the number of times the ink is reused 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 in the ratio of 2:1 to the ester-soluble black ink. Alcohol-soluble black ink, so that the system of black ink and varnish can be different, thereby eliminating the phenomenon of "dissolving ink" of black ink. This method also works for the "whitening" phenomenon, and it works very well.

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