Non-foil composite structures for packaging juice
AssigneeInternational Paper Company
InventorsCharles E. Gibbons, Cynthia L. Tanner, Allan A. Whillock
Life of this patent
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Abstract
The present invention relates to a non-foil composite barrier for an improved container for citrus juices and other liquids. The container utilizes a paperboard barrier laminate for the containment of essential oils and the prevention of losses of vitamin C. Also disclosed is a process of making the laminate. The laminate makes use of an inner barrier layer of a heat-sealable ethylene vinyl alcohol copolymer to enhance the barrier properties of the laminate.
Claims14
A container for liquids containing essential oils and/or flavors, said container constructed from a laminate comprising:
- (a) a paperboard substrate;
- (b) a 12 lb outer layer of a heat-sealable low density polyethylene polymer coated on said outer surface of said paperboard substrate;
- (c) an inner sandwich layer comprising a 4.5 lb tie layer, a 4.0 lb heat-sealable ethylene vinyl alcohol copolymer layer and a 4.5 lb tie layer coextruded on said inner surface of said paperboard substrate;
- and
- (d) a product-contact layer of a 10 lb heat-sealable low density polyethylene polymer coextruded onto said outer surface of said inner sandwich layer of tie layer-ethylene vinyl alcohol copolymer layer-tie layer whereby said laminate can be heat-sealed on conventional equipment at temperatures ranging from 250.degree. F.-500.degree. F.
A container for liquids containing essential oils and/or flavors, said container constructed from a laminate comprising:
- (a) a paperboard substrate;
- (b) a thin 0.8 mil thick outer layer of a heat-sealable low density polyethylene polymer coated on said outer surface of said paperboard substrate;
- (c) an inner thin tie layer and a 0.2 to 0.7 mil thick layer of a heat-sealable ethylene vinyl alcohol copolymer, coextruded on said inner surface of said paperboard substrate;
- and
- (d) a thin 0.7 mil thick layer of a heat-sealable low density polyethylene polymer coated on an outer surface of said tie material-ethylene vinyl alcohol copolymer layer whereby said laminate can be heat-sealed on conventional equipment at temperatures ranging from 250.degree. F.-500.degree. F.
A container for liquids containing essential oils and/or flavors constructed from a laminate comprising:
- (a) a paperboard substrate;
- a thin 0.8 mil thick outer layer of a heat-sealable low density polyethylene polymer coated on said outer surface of said paperboard substrate;
- (c) an inner tie layer of an ethylene acrylic acid coated on said inner surface of said paperboard substrate;
- (d) a 0.2 to 0.7 mil thick ethylene vinyl alcohol copolymer layer coated on said tie layer;
- (e) a thin 0.7 mil thick heat-sealable layer of a low density polyethylene polymer coated on said outer surface of said EVOH layer.
Dependencies are inferred from the claim text.