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Blow-molded plastic bottle with barrier structure for food packages
| Details |
Inventors: Bettle, III, Griscom; Gargano, Christopher W.;
Assignee:
Primary Examiner: Ives; P. C.
Assistant Examiner:
Attorney, Agent or Firm: Cook and Egan
A barrier structure liner for food packages comprises two layers of EVOH (ethylene-vinyl alcohol copolymers), one of which is interposed between two moisture barriers. The inner layer of EVOH (in contact with the packaged food) functions as a solvent barrier which reduces the loss of flavor components from the foods, while the buried EVOH layer, protected from moisture from the packaged food and the outside atmosphere, serves as an oxygen barrier to prevent oxygen from outside the package from oxidizing the foods within the container. The barrier structure may be used in paper cartons, plastic bottles, bags and the like. |
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DETAILED DESCRIPTION The present invention provides a barrier structure adapted to be fabricated into packages for foods to produce packages which are economical, but which are at least equal to the prior art structures with respect to oxygen permeability and which overcome the flavor loss (i.
e.
, scalping) problems and heat-sealing and other problems associated with the prior art structures.
In its broadest embodiment, the barrier structure of the present invention comprises two relatively thin layers of EVOH, one of which is interposed between two moisture barrier layers.
The barrier structure is fabricated into packages, whereby one layer of EVOH is in contact with the packaged product (i.
e.
, the inner layer), and the other EVOH layer (i.
e.
, the buried layer) is separated from the packaged product by a first moisture barrier layer and from the outside atmosphere by a second moisture barrier.
In some cases, structural layers of the package may provide the required moisture barrier for the barrier structure of the present invention.
The barrier structure of the present invention may be used in several different embodiments of food packages.
In one embodiment, the barrier structure of the present invention is incorporated into a paper carton which comprises a layer of fiber, such as milk board or juice board.
The fiber layers of the juice board give structural substance to the carton, while the barrier structure of the present invention provides a superior oxygen barrier and superior flavor retaining properties.
In the paper carbon embodiment, the package may comprise a laminated structure having six layers which are as follows: Low-density polyethylene; Fiber; Low-density polyethylene; Ethylene-vinyl alcohol copolymer; Coextrudible adhesive layer; Ethylene-vinyl alcohol copolymer.
In another embodiment, the barrier structure of the present invention may be incorporated into a plastic bottle using commercially available coextrusion blow molding techniques.
In the plastic bottle embodiment, the bottle wall may comprise seven layers, which are as follows: High-density polyethylene; Adhesive; Ethylene-vinyl alcohol copolymer; Adhesive; Regrind; Adhesive; Ethylene-vinyl alcohol copolymer
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