Poor Rub
The printed ink film is dry, but has excessive rub and scuffing when going through the delivery and finishing processes.
| Cause | Cure |
|---|---|
| Too much water in paper or used during run. | Reduce water settings, or change paper. |
| pH and/or conductivity of fountain solution is either too high or low. | Check pH and conductivity to ensure proper dosage, dump and clean system if contaminated. |
| Ink not dry. | Refer to inadequate drying section. |
| Poor paper coating integrity. | Change paper, call paper supplier. |
| Paper type such as matte stocks, roughness of paper surface creates a poor rub between unprinted and printed areas. | Consult ink manufacturer to provide an ink with better rub resistance. |
| Too much ink, ink film thickness is too high. | Reduce ink film thickness, lower settings to proper ink densities. |
| Ink is not formulated correctly. | Consult ink manufacturer. |
| Chalking or ink is not binding to paper stock. | Ink not compatible with paper stock, consult ink manufacturer. |
