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Causes and solutions for uneven background color of packaging bags
Release time:2019-08-23
Uneven base color of packaging bags refers to the presence of irregular spots or pinholes with varying density in large-area spot colors. Generally, base colors with gradient transitions are prone to uneven ink scraping, while pinholes often appear on solid base colors (without gradient transitions). Therefore, uneven base color is further classified into uneven base ink scraping and base pinholes.
Uneven base color of packaging bags refers to irregular spots or specks of varying shades in a large area of spot color. Base colors with gradual transitions are often prone to uneven inking, while specks often appear on base colors without gradual transitions. Therefore, uneven base color can be divided into two types: uneven inking of the base color and specks in the base color.
How to avoid or solve these two situations? Shunxingyuan Packaging, a professional flexible packaging manufacturer, summarizes the following based on its production experience:
I. Uneven Base Color Inking
Abnormal Reasons:
1. Ink viscosity is too high;
2. Poor ink flow;
3. The backer paper on the back of the doctor blade is too long, reducing ink flow;
4. Too much remaining ink;
5. The doctor blade is not installed flat, with wavy gaps between the doctor blade and the backing blade;
6. Slight plate clogging in the printing dots.
Solutions:
1. Reduce ink viscosity appropriately;
2. Replace with ink that has better flow;
3. Check if the printing plate is too close to the bottom of the ink fountain? Is the backer paper curled or warped, hindering ink flow? Make appropriate improvements as needed;
4. Replace with new ink;
5. Check for foreign objects between the doctor blade and the backing blade, clean them and reinstall the doctor blade, replace the blade if necessary;
6. Use a clean cloth to wipe the plate vigorously with ink to ensure that all printing dots are printed (Note: Solvents or cleaning powder can also be used to wipe the plate, but since the wiped area is prone to abnormal fading of the printed image within tens of meters, a strip should be marked for inspection and removal. Generally, the use of solvents or cleaning powder to wipe the plate is not recommended during the printing process).
II. Base Color Specks
Abnormal Reasons:
1. Ink viscosity is too low;
2. Printing speed is too slow;
3. Impression cylinder hardness is too low;
4. Doctor blade is too flat (angle is too small);
5. Printing plate dots are too deep (very unlikely).
Solutions:
1. Increase ink viscosity appropriately;
2. Increase printing speed appropriately;
3. Replace with a higher hardness impression cylinder;
4. Increase the doctor blade angle;
5. Remake the plate.
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