Polyester tray package with lidding film having glycol-modified copolyester sealant layer
AssigneeCryovac, Inc.
InventorWalter B. Mueller
Life of this patent
Estimating the term…
Abstract
A tray-type package is disclosed which includes a polyester support member, a product contained on the support member, and a lidding film containing the product and sealed to the periphery of the support member, the lidding film including a sealant layer of a polyester copolymer having greater than about 50% by mole of glycol polymerization units. Preferably, the support member is a foamed or nonfoamed polyethylene terephthalate (PET) tray and the lidding film is a multilayer film which includes a glycol-modified PET sealant layer. Also disclosed is a lidding film having a sealant layer of a blend of a glycol-modified PET and at least one further polymeric component.
Claims20
A package comprising:
- a support member comprising a polyester,
- a product contained on the support member;
- and
- a multilayer lidding film containing the product and sealed to the periphery of the support member, the lidding film comprising a sealant layer comprising a polyester copolymer comprising greater than about 50% by mole of glycol polymerization units.
A package comprising:
- a support member comprising a polyester,
- a product contained on the support member;
- and
- a lidding film containing the product and sealed to the periphery of the support member, the lidding film comprising a sealant layer comprising blend of a polyester copolymer comprising greater than about 50% by mole of glycol polymerization units and at least one further polymeric component.
A method for making a package comprising the steps of:
- a) coextruding a multilayer lidding film comprising a sealant layer comprising polyester copolymer comprising greater than about 50% by mole of glycol polymerization units;
- b) providing a support member comprising a polyester;
- c) placing a product on the support member;
- d) extending the lidding film above the support member and product, the sealant layer being immediately above and adjacent to the support member and the product;
- and
- e) sealing the lidding film to the support member such that the product is enclosed thereby and such that the sealant layer is directly sealed to periphery of said support member.
A method for making a package comprising the steps of:
- a) extruding a lidding film comprising a blend of a sealant layer comprising polyester copolymer comprising greater than about 50% by mole of glycol polymerization units and at least one further polymeric component,
- b) providing a support member comprising a polyester;
- c) placing a product on the support member;
- d) extending the lidding film above the support member and product, the sealant layer being immediately above and adjacent to the support member and the product;
- and
- e) sealing the lidding film to the support member such that the product is enclosed thereby and such that the sealant layer is directly sealed to periphery of said support member.
Dependencies are inferred from the claim text.