초록 ▼

A plastic, easy-opening closure for a retortable container and a method for sealing are provided. The closure includes a plastic membrane having an outer layer of polypropylene, a first tie layer, an intermediate layer formed of EVOH, a second tie layer, an inner layer formed of polypropylene, and a

A plastic, easy-opening closure for a retortable container and a method for sealing are provided. The closure includes a plastic membrane having an outer layer of polypropylene, a first tie layer, an intermediate layer formed of EVOH, a second tie layer, an inner layer formed of polypropylene, and a peel-seal layer. The peel-seal layer can be formed of high density polyethylene or polypropylene with a contaminant dispersed therein so that the closure can be easily removed from the container for opening.

대표청구항 ▼

That which is claimed: 1. An easy-opening closure for sealing an opening of a retortable container, the closure comprising: an outer layer formed of polypropylene; a first tie layer disposed on the outer layer; an intermediate layer disposed on the first tie layer opposite the outer layer and adher

That which is claimed: 1. An easy-opening closure for sealing an opening of a retortable container, the closure comprising: an outer layer formed of polypropylene; a first tie layer disposed on the outer layer; an intermediate layer disposed on the first tie layer opposite the outer layer and adhered to the outer layer by the first tie layer, the intermediate layer being formed of EVOH; a second tie layer disposed on the intermediate layer opposite the first tie layer; an inner layer disposed on the second tie layer opposite the intermediate layer, the inner layer being formed entirely of polypropylene; and a peel-seal layer disposed on the inner layer opposite the second tie layer, wherein the peel-seal layer is thinner than the inner layer and is configured to be adhered to the container and structured to provide a bond of controlled strength between the closure and the container such that the closure can be peeled therefrom with a predetermined force. 2. An easy-opening closure according to claim 1 wherein the peel-seal layer is configured to have a shear force strength of at least about 20 psi and a tensile force strength of less than about 14 pounds. 3. An easy-opening closure according to claim 1 wherein the peel-seal layer comprises polypropylene with a contaminant dispersed therein. 4. An easy-opening closure according to claim 3 wherein the contaminant is at least one of the group consisting of talc, calcium carbonate, and high density polyethylene. 5. An easy-opening closure according to claim 1 wherein the peel-seal layer is a layer of high density polyethylene. 6. An easy-opening closure according to claim 1 further comprising oxygen scavengers disposed therein. 7. An easy-opening closure according to claim 1 wherein the outer, intermediate, inner, and peel-seal layers are coextruded layers. 8. An easy-opening closure according to claim 1 wherein the closure is a substantially planar lid defining a grip portion disposed on the outer layer opposite the inner layer.