Claims
- 1. 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; and
- coating a second side of said substrate with a heat sealable barrier layer.
- 2. The method, as in claim 1, wherein said varnish coating step is further comprised of the step of:
- radiating said varnish coating with an electron beam.
- 3. The method, as in claim 1, wherein said varnish coating step is further comprised of the step of:
- radiating said varnish coating with an ultraviolet beam.
Parent Case Info
This is a divisional of application Ser. No. 08/420,775 filed on Apr. 12, 1995, now abandoned.
US Referenced Citations (22)
Non-Patent Literature Citations (1)
Entry |
W. Pat Maddox, Westvaco Corp. & G. Wesley Pruitt, Genik Inc., High speed gravure with electron beam cure--compatability or contradiction? pp. 57-65. No Date. |
Divisions (1)
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Number |
Date |
Country |
Parent |
420775 |
Apr 1995 |
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