Effect of Drying Conditions on Paper Quality on Wood-Containing Light Weight Coated Paper, 1991 Coating Conference Proceedings

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The effect of different drying configurations and drying profiles on offset print mottling was studied on a pilot coater utilizing a drying simulation program and a laboratory sheet fed four color offset print. The existence, as well as significance, of a drying critical area was demonstrated. The key factor in the drying critical area is the coating color solidification process. On the base stock/coating color combination studied the critical solids content starts at 73% and ends at 81%. During this drying phase, specific evaporation should be low and rates of about 15kg/m2h or higher clearly will increase the print mottling.

The drying energy source had little influence on the print mottling tendency. However, for the best print and paper gloss combined with least print mottling, a drying concept including both infared and air dryers is recommended.