China Printing Solutions-Inverse overprint mainly in low speed especially when printing, in high speed press overprint phenomenon is reduced, the key is to solve the problem of inverse overprint, this article analyzes the reasons, clear the overprint, general is a former color ink color ink plate after their anti-indian, to enter the color ink tank, after changed the color of color ink, eventually leading to printing is unable to continue, gradually became light green color such as yellow ink, red ink gradually became purple color.General can be solved from the following three aspects:
1, adjusted color ink dilution solvent ratio, reduce color ink color ink before and after contact with's ability to dissolve before color ink, color ink after dilution, join part of isopropyl alcohol and use less as far as possible toluene;
2, improve the speed of printing printing speed can obviously reduce the color ink and color ink before contact time, this also is the overprint especially during low speed printing, and basic without an overprint phenomenon in high speed printing.This point in the actual printing may be subject to the conditions of printing equipment and printing environment;
3, adjust the printing ink formulation composition can be used to improve first before color ink adhesion method on BOPP film, make contact with two layers of ink, color ink before still attached on BOPP film, in the printing ink of CLPP system, general can increase the content of CLPP solution.Second, can improve the drying rate of before color ink, increase color ink before baking temperature, prevent the ink ink film in small amounts of volatile solvents.
(Gold Printing Group) |
