|PROBLEM-The ink fails to properly bind to the stock.
SYMPTOM-After the ink is dried, the ink can easily be rubbed off the sheet as a powder.
NOTE: Chalking is not apparent until after the job has been printed and dried. A chalked job can sometimes be salvaged by overprinted with a gloss varnish.
||Excessive vehicle penetration into the substrate.
||Contact paper manufacturer if job has been completed.
If job is not complete, try adding Superior’s product number
OV-196 (Super Water Repellent Varnish).
||Excessively acidic stock caused
||Check stock pH; if too acidic, add
W-4280 Combination Drier (up to 1/4 oz. per pound of ink) or W-1401
Liquid Fountain Additive or consult ink technician to reformulate
||Fountain solution too acidic.
||Make more alkaline (e.g. raise pH from 4.0 to 4.5).
||Ink formulated too soft, causing emulsification.
||Add 1/2 oz. of OV-196 and consult ink technician if
formulation of ink with better water fighting properties is required.
|*Although not the most probable cause, this should
be investigated and ruled out first.