Patent ID: 6096384
Filing Date: 2000-08-01
Classification: B41M,D21H,Y10T

Abstract:
A method of constructing a composite lid having an overprint varnish which is used to cover a food-containing tray, wherein said method is consisting essentially of the steps of:coating a first side of a paperboard substrate with a layer of particulate minerals;printing a layer of graphics substantially over said particulate mineral layer;coating said printed graphics layer with an overcoat of a heat resistant, radiation-cured varnish having 100% solids, wherein said varnish is mass stable above 325.degree. F. and said varnish substantially prevents said layer of printed graphics from being distorted during a pressure platen heat-sealing of said lid to a vessel at a pressure of at least 60 psig and said varnish does not substantially adhere to said platen during said heat sealing; andcoating a second side of said substrate with a heat sealable barrier layer.