The reverse printing in the printing process is especially obvious in the middle and low-speed printing. The reverse printing may be greatly reduced during high-speed printing. The key to solving the reverse printing problem lies in the analysis of the causes. Reverse printing refers to the printing of the ink of the front color on the printing plate of the back color ink, thereby entering the ink tank of the back color, changing the color of the ink of the back color, eventually causing the printing to be unable to proceed, as the yellow ink gradually turns into a light green color. The red ink gradually turned into a purple color.
Anti-envelope printing can generally be resolved from the following aspects:
1. Adjust the ratio of the ink dilution solvent for the back color ink to reduce the ability of the back color ink to dissolve the front color ink when in contact with the front color ink. That is, when diluting the back color ink, add a portion of isopropyl alcohol and use less toluene;
2, increase the speed of printing
Increasing the printing speed can significantly reduce the contact time between the back color ink and the front color ink, which is particularly obvious in reverse printing at low speed printing, and there is basically no reason for reverse printing in high speed printing. This may be limited by the printing equipment and the printing environment during actual printing;
3, adjust the composition of printing ink formulations
First of all, you can use the method of improving the adhesion of the ink on the BOPP film, so that when the two inks are in contact, the ink of the front color is still attached to the BOPP film. In the ink of the CL-PP system, the CL-PP can generally be increased. Content is solved. Secondly, the drying speed of the ink of the preceding color can be increased, the temperature of the drying path of the ink of the preceding color can be increased, and the presence of a small amount of non-volatile solvent in the ink ink film can be prevented.
The problem of reverse printing will seriously affect the quality of printing and solve the problem of reverse printing. Not only can the quality of printing be improved, but smooth printing can also increase printing efficiency and increase corporate profits.
Anti-envelope printing can generally be resolved from the following aspects:
1. Adjust the ratio of the ink dilution solvent for the back color ink to reduce the ability of the back color ink to dissolve the front color ink when in contact with the front color ink. That is, when diluting the back color ink, add a portion of isopropyl alcohol and use less toluene;
2, increase the speed of printing
Increasing the printing speed can significantly reduce the contact time between the back color ink and the front color ink, which is particularly obvious in reverse printing at low speed printing, and there is basically no reason for reverse printing in high speed printing. This may be limited by the printing equipment and the printing environment during actual printing;
3, adjust the composition of printing ink formulations
First of all, you can use the method of improving the adhesion of the ink on the BOPP film, so that when the two inks are in contact, the ink of the front color is still attached to the BOPP film. In the ink of the CL-PP system, the CL-PP can generally be increased. Content is solved. Secondly, the drying speed of the ink of the preceding color can be increased, the temperature of the drying path of the ink of the preceding color can be increased, and the presence of a small amount of non-volatile solvent in the ink ink film can be prevented.
The problem of reverse printing will seriously affect the quality of printing and solve the problem of reverse printing. Not only can the quality of printing be improved, but smooth printing can also increase printing efficiency and increase corporate profits.
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