Problem: Ghost image of previous panel
Causes: Application roller does not re-wet to the same level as
for the previous panel.
Solutions: Apply scraper to the application roller.
Problem: Line formation, crosswise
Causes: Different speed on conveyor and application roller.
Damaged application roller. Too high down pressure on ap-
plication roller. Pressure between doctor and application
roller too high. Doctor roller running reverse at too high of a
speed. Not enough material between rollers.
Solutions: Check application roller and conveyor speed. Check
for damage on the roller. Use less down pressure. Release pres-
sure between rollers. Slow down reversing doctor roller. Increase
the pump pressure.
Problem: Line formation, lengthwise
Causes: Damaged scraper on doctor roller, or in case of a
light filler machine the scraper of the smoothing roller. Dam-
aged application roller. The protective shutter in the UV oven
is set too low (infeed). Ghost image of previous panel.
Solutions: Replace damaged equipment. Adjust height of shutter.
Not enough coating on roller.
Problem: Scrape marks and lip formation in front or end
Causes: The speed of the application roller and conveyor belt
is not synchronized. Smoothing roller running too fast or at
too high pressure. Too much material applied before smoothing when filling.
Solutions: Adjust the speed of the application roller. Decrease
the speed of the smoothing roller and/or release pressure.
Decrease application amount in light filler machine by pressing doctor and application roller together, or change speed of
Source: AcromaPro, “Facts on Finishing” – The Sherwin Williams Co.
For information call 888-277-1418 or visit AcromaPro.com.