The shadows and tight reverses start to fill in and become “plugged” with ink during the run.
Cause | Cure |
---|---|
Plate becomes sensitive and accepts ink. | Clean plate with a good acidic plate cleaner and re-gum the plate with a gum finisher. Replace plate if it does not clean up. |
Improper fountain solution or dosage. | Check press mix for proper dosage, pH and conductivity. Adjust concentration to specifications. Consult fountain solution supplier. |
Contaminated chemistry. | Dump and re-batch chemistry. |
Ink becomes water logged and emulsified. | Reduce water settings to achieve better ink and water balance. Consult Ink supplier. |
Improper pH of fountain solution. | Check pH of press mix and adjust accordingly to a pH of around 4.0. |
Pressure settings too high. | Adjust blanket and plate pressures to specifications. Make sure blanket and plate are packed to specified heights. |
Water settings too low. | Adjust water settings until problem is eliminated. |
Plate not processed properly. | Consult plate manufacturer and prepress to ensure plate is being processed correctly. |
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