Inventors:
Giancarlo A. Cavagna - Silver Spring MD
Ernest J. Groome - Charleston SC
Joseph M. Murphy - Springfield MA
Domenick L. Raschella - Midlothian VA
Assignee:
Westvaco Corporation - New York NY
International Classification:
B05D 302, B05D 312, B05D 500, B05D 700
Abstract:
Unbleached paper and paperboard for use as outer packaging material is coated and printed on a printing press. The unbleached rawstock must be relatively smooth and nonporous prior to coating and printing with a Sheffield roughness less than about 300 units for linerboard and less than about 330 units for folding carton material. The coating formulation preferably comprises a mixture of temperature insensitive binders and pigments having a viscosity lower than normal paper coatings, and is applied in layers of about 1. 5 lb. /1000 square feet up to a total of about 5 lb. /1000 square feet. Best results are obtained when the coated surface is doctored with a blade or fixed roll after coating and before drying to achieve a smooth surface for printing on the same or a different press.