Importance

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Abstract

Sheet material especially for beverage and food containers, and methods of making. The sheet material comprises a layer of paperboard and expanded, preferably non-syntactic, foam layer applied as an unexpanded coating, preferably about 1-76 microns thick, in a liquid carrier, to the paperboard layer. The expanded foam has a remote surface preferably defined by intermingled randomly-spaced peaks and valleys. The coating is preferably sufficiently continuous to prevent a user's finger from touching the substrate, and sufficiently insulating that a person can hold a container of 100 degree C. liquid, having sidewalls made from the sheet material, without discomfort. A cover layer can overlie the foam. The substrate can include a heat seal layer, with the paperboard between the heat seal layer and the expanded foam layer; or with the foam layer between the heat seal layer and the paperboard. Preferred composition for the foam layer is PVDC or AMM.

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First Claim