Scumming
Fountain solution does not have the ability to clean the non-image areas of the plate.
| Cause | Cure |
|---|---|
| Low alcohol sub concentrate | Increase Alc. Sub to correct concentration. Increase if problem persists. |
| Glazed Rollers | Remove and deglazed effected roller. Replace and reset ink stripes. |
| Excessive pressures. Ink forms to plate | Reset to press manufacturers specs. |
| Plate sensitivity | Consult with plate room. |
| Ink/Water balance | Refer to ink/water balance. |
| Fountain Solution ratio is incorrect | Check pH and conductivity for proper mix. Correct as necessary to manufactures recommended dosage. |
| Central Mix system inconsistent | Check proportioner is mixing at correct and consistent ratios. If using a water treatment R.O., D.I. etc. is producing correctly. |
| Fountain Solution Temp is to high | Adjust chilling unit on recirculating tank to chill between 58° to 65° F. |
| Ink vibrators to hot | Increase chill water flow to read between 80° to 85°F. |
| Roller settings and durometer out of spec | Check durometer and settings. Replace and calibrate as necessary. |
