IP Library › Granted Patent US 6,887,538
Granted Patent B2
US 6,887,538 · App. 10/148,313 · Granted May 3, 2005

Barrier structure for food

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Quick Facts
Patent No.
US 6,887,538
App. No.
10/148,313
Granted
May 3, 2005
Kind
B2
Abstract

A barrier laminate useful for the formation of orange juice and citrus beverage cartons is provided. The laminate provides a skin coat of a MDPE which provides a barrier to water vapor transmission through the laminate. The reduced water vapor flow decreases the bulge rate of the resulting carton.

Claims (16)

1. A barrier laminate comprising:

a paperboard substrate having a first surface and a second surface, the second surface being opposite the first surface;

a nylon barrier layer applied directly on the first surface of paperboard substrate;

a tie layer applied to an inner surface of the nylon barrier layer;

a medium density polyethylene barrier layer applied directly onto an inner surface of the tie layer, the medium density polyethylene barrier layer further providing a heat seal layer.

2. The barrier laminate according to claim 1 wherein the medium density polyethylene has an average density of between about 0.926 and about 0.940.

3. The barrier laminate according to claim 2 wherein the MDPE is applied to the paperboard substrate at coating weight of between about 3-5 pounds per 3000 square feet.

4. The barrier laminate according to claim 1 further comprising a second layer of MDPE applied to the second surface of the paperboard substrate.

5. A foldable laminated blank comprising:

a substrate material selected from the group consisting of paper, paperboard, fiberboard, and bleached kraft paper having a first side and a second side opposite the first side;

a nylon barrier layer attached along an outer surface directly to the first side of the substrate material;

a product contacting surface opposite an inner surface of the nylon barrier layer, and comprised substantially entirely of a layer of MDPE, the layer of MDPE providing a heat sealable barrier.

6. The barrier laminate according to claim 5 further comprising a tie layer connecting the inner nylon barrier layer surface to an outer surface of the MDPE product contacting layer.

7. The barrier laminate according to claim 5 wherein the medium density polyethylene barrier layer has an average density of between about 0.926 and about 0.94.

8. The barrier laminate according to claim 6 wherein the MDPE is applied at a coating weight of between about 3-5 pounds per 3000 square feet.

9. The barrier laminate according to claim 5 further comprising a second layer of MDPE applied to the second surface of the substrate.