Anti-overprinting is especially obvious in medium and low speed printing, and the phenomenon of anti-overprinting is greatly reduced in high-speed printing. Therefore, the key to solve the problem of anti-overprinting is to analyze the causes clearly. When reverse overprinting, the former color ink is generally reversed to the printing plate of the post-color ink, which enters the post-color ink slot, changes the color of the post-color ink, and ultimately leads to the printing cannot continue, such as yellow ink gradually becomes a light green color, and red ink gradually becomes a purple color. So how to deal with the anti-overprint problem in spiral yo book printing manufacturer? Let's take a look at it!

1, improving the printing speed can significantly reduce the contact time between the post-color ink and the pre-color ink, which is also the reason why the anti-overprint is especially obvious when printing at low speed, and there is basically no anti-overprint phenomenon in high-speed printing.

2, adjust the ratio of diluting solvent of the post-color ink, reduce the dissolution ability of the post-color ink when in contact with the pre-color ink, that is, when diluting the post-color ink, add a part of isopropyl alcohol, and use toluene as little as possible.

3, adjust the composition of the printing ink formula can first be used to improve the adhesion of the front color ink on the BOPP film, so that when the two layers of ink contact, the front color ink is still attached to the BOPP film, in the CLPP system of ink, generally can increase the content of CLPP to solve. Secondly, it can improve the drying speed of the pre-color ink, increase the drying temperature of the pre-color ink, and prevent a small amount of unvolatilized solvent in the ink film.

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