From: Gary Jones (firstname.lastname@example.org )
Date: Fri, 7 Mar 2003 10:06:01
Your inquiry to PNEAC regarding a sticky substance on the plate (plate piling), was forwarded to the Technical Inquiry Desk. Buildup of material on the plate is usually ink or paper contamination. In the case of ink, the ink may be too short, or contain too much pigment and will not transfer properly, emulsified ink may also pile on the plate. You may want to contact the ink manufacture for their suggestions, some printer will add a varnish to make the ink longer. If the ink is emulsified, try running less fountain solution, if the build up is paper contamination try a different paper.
Fountain solution is normally measured by conductivity, and pH. Normal ranges are between 1000 and 2000 conductivity. Different fountain solution all have different ranges, no one conductivity number is best. Measuring fountain solution by % dilution will not provide accurate information about the actual concentration of chemicals in the fountain solution.