Patent ID: 6881286

Claim:
A method of manufacturing a sealed container for products comprising: providing a tubular member comprising at least one paperboard body ply having an inner surface and a liner ply adhered to the inner surface of the body ply, the liner ply comprising a barrier layer; rolling outwardly at least one end of the tubular member to form a rim; providing a lid for closing the end of said tubular member, the lid comprising a barrier layer, at least one of said lid and said liner ply further comprising at least one seal layer comprising a heat soluble composition, the seal layer being operatively positioned to form a heat seal between the lid and the liner ply; contacting the rim and the lid; heating the seal layer under conditions sufficient to render the heat sealable composition of the seal layer flowable; pressing the rim and the lid together to preferentially encourage flow of the heat sealable composition in the direction of the interior of the container to form an inner bead and an outer bead of the heat sealable composition, the inner bead comprising a larger amount of the heat sealable composition in cross-section than the outer bead, thereby hermetically sealing the lid to the liner ply, wherein the heat seal comprising the inner bead and the outer bead extends substantially continuously around the entire circumference of the rim.