초록 ▼

A deliddable ovenable container, such as a molded pulp tray with a liner obtained from a thin film of polyester, useful for packaging food to be frozen for sale and storage and subsequently heated by the consumer in either a microwave or a conventional oven, with means to insure that a transparent a

A deliddable ovenable container, such as a molded pulp tray with a liner obtained from a thin film of polyester, useful for packaging food to be frozen for sale and storage and subsequently heated by the consumer in either a microwave or a conventional oven, with means to insure that a transparent and flexible lid of polyester film sealed thereto by heat and pressure subsequently can be peeled away from the polyester liner of the tray without any undesirable delamination of the liner from the molded pulp base of the tray, either at freezing temperatures before heating or at high temperatures after heating, to expose the food for consumption. Such means includes a coating of release material having adhesive properties, such as methyl cellulose, on the liner outside the area where the lid is to be sealed to prevent strong adherence between the lid and the liner at the extreme edges of the tray, the release material ideally having fiber adhesive properties as well and being applied to the cut edge which strengthens the mechanically trimmed fibrous material around the edge of the molded pulp base, plus increased density of the fibrous material only around the zone of the release material and the lid seal so that the fibrous material additionally resists being pulled apart in that area while still providing a thicker thus stronger tray elsewhere which resists bending forces.

대표청구항 ▼

A liddable packaging container comprising a relatively thick base of fibrous material having bonded to at least one portion of one side thereof a relatively thin liner of polymeric material, the base and the liner and the bond between them being capable of withstanding temperatures ranging from belo

A liddable packaging container comprising a relatively thick base of fibrous material having bonded to at least one portion of one side thereof a relatively thin liner of polymeric material, the base and the liner and the bond between them being capable of withstanding temperatures ranging from below freezing up to as high as about 400°F., the container including a central portion for accommodating a product to be packaged therein surrounded by a marginal portion for accommodating a lid to contain the product, the marginal portion including a surface to which a lid can be sealed to the liner, the lid and the seal between the lid and the liner also being capable of withstanding temperatures within the aforesaid range, and a coating of release material on the marginal portion outside the area where the lid is to be sealed to insure that the seal can be overcome and the lid fully separated from the liner of the container manually without adversely affecting either the polymeric material of the liner or the fibrous material of the base or the bond between the liner and the base at any temperature within the aforesaid range.