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AssigneeWestvaco Corporation
InventorsGiancarlo A. Cavagna, Ernest J. Groome, Joseph M. Murphy, Domenick L. Raschella
Estimating the term…
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.
The process of manufacturing outer packaging material on a web fed printing press having a plurality of printing stations comprising the steps of:
A process for manufacturing outer packaging material on a printing press comprising:
Dependencies are inferred from the claim text.