Reasons and measures for the color to be too thick at the overlap of the two colors when printing on

The relative technical content of overprinting and overprinting in the printing process is relatively high. Nowadays, there are more chromatographic and overprinting products, and there are often some problems in the operation and adjustment of the machine. This article analyzes the reasons and solutions for the overlap of one color with another color during cardboard printing.

Reason 1: The order of the ink colors is not accurate, for example, trying to use a lighter color to cover a darker color
Measures: Change the printing order of ink colors, light color first, dark color.

Reason 2: The ink layer is too thick
Measures: reduce the ink layer, use the least amount of ink to achieve the best ink coverage effect.

Reason 3: Ink color and ink viscosity are not accurate
Measures: The light color ink must be printed first and the viscosity is lower than that of the second color ink.

Reason 4: Because of the quality of the ink or the thickness of the ink layer, the ink on the first printing is slow to dry
Measures: Increase the ink drying speed through the following methods: reduce the ink concentration; use a better squeegee device to reduce the thickness of the ink layer; change the ink formula to speed up the drying speed; reduce the operating speed of the printing press; reduce the anilox roller Ink flow; increase the temperature of the dryer.

Reason 5: The ink cannot be printed on the substrate because its concentration is too low
Measures: Increase the concentration of the second ink and make it higher than the concentration of the first ink.

Reason 6: The ink cannot be printed on the substrate because it dries too fast
Measures: Reduce the drying rate through the following measures: add a solvent that reduces the drying rate; stop the air or heat flow on the printing plate; increase the printing press's operating speed.

Reason 7: The pH value of the ink is too high or too low to be printed on the substrate
Measures: Adjust the pH value of the ink to make it meet the specifications recommended by the ink supplier or change the ink.

Reason 8: The ink is not dry due to the quality of the substrate
Measures: Change the substrate, reduce the thickness of the ink layer, or strengthen the function of the ink drying system.

Reason 9: The ink and the first ink are not compatible with each other
Measures: Consult the ink supplier for suggestions on changing inks, additives or related products.