Streaks, tracking, or ink smearing due to the folding or finishing operations through mechanical contact.
Cause | Cure |
---|---|
Grater roller | Install grater roller with sharper points. |
Ink film thickness | Decrease ink film thickness by increasing pigment strength in ink. |
Web bustle wheels | Move bustle wheels so they are in contact with non image area, if this is not possible, put Teflon tape on wheels to reduce abrasiveness. |
Air flow through oven causing paper to move around and coming in contact with oven parts | Check to make sure web tension is set properly. Consult oven manufacturer for proper adjustment. |
Chill roll temperature not cool enough | Reduce chill roll temperature to 72 to 75 F°. Do not go too low on temperature as condensation may occur. |
Silicone dosage or applicator | Check to make sure silicone applicator roller is clean and functioning properly, check dosage, if low add extra silicone to reduce abrasiveness. Consult silicone supplier. |
Web temperature not high enough to drive off ink solvents or too high and not allowing chill rollers to bring web temperature down | Adjust oven temperature, remember that paper will burn at 451 F°. Decrease press speed to allow longer contact time in oven. Increase air velocity through oven. Check web temperature before and after chill rolls. Consult oven manufacturer. |
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