Barrier laminates for the retention of essential oils, vitamins and flavors in citrus beverages and a method of making said laminate and leak-tight containers therefrom

Claim 1

A heat-sealed, leak-tight product container made from a foldable laminated blank, said container comprising: a multiplicity of side wall panels which are interconnected to one another to form a tubular body of generally rectangular cross-section and fold-in top and bottom closures which are heat-sealed to one another to form substantially uncrystalized leak-tight seals, said foldable laminated container blank comprising a substrate material having an inner surface and an outer surface, said substrate material being selected from the group consisting of paper, paperboard, fiberboard and bleached kraft paper, said inner surface having a layer of glycol-modified polyethylene terephthalate bonded thereto, said foldable laminated container blank being so assembled and heat-sealed that the product-contacting surface of said container is comprised substantially entirely of said layer of glycol-modified polyethylene terephthalate.

Claim 14

A method of making a heat-sealed, leak-tight container made from a foldable laminated blank and containing a predetermind quantity of a beverage, said method comprising the steps of: (a) bringing a film of glycol-modified polyethylene terephthalate in direct contact with the inner surface of a web of substrate material, thereby forming a laminate, said substrate material being selected from the group consisting of paper, paperboard, fiberboard, and bleached kraft paper; (b) applying heat and pressure to said laminate to bond said film of glycol-modified polyethylene terephthalate to said web of substrate material without causing crystalization of said glycol-modified polyethylene terephthalate, thereby forming a barrier laminate; (c) cutting a one-piece foldable container blank from said barrier laminate, said container blank including a multiplicity of side wall panels which are interconnected to one another, said container blank further including fold-in top and bottom closures secured to said side wall panels; (d) erecting said foldable container blank to form a tubular body of generally rectangular cross-section and heat-sealing said bottom closure and said side wall panels to one another by the application of heat and pressure without causing crystalization of said glycol-modified polyethylene terephthalate, said container being so erected and heat-sealed that said glycol-modified polyethylene terephthalate comprises the beverage-contacting surface of said container; (e) filling said beverage into said erected container; and (f) heat-sealing said top closure to form a leak-tight seal with said side wall panels by applying heat and pressure thereto without causing crystalization of said glycol-modified polyethylene terephthalate, whereby substantially all of said beverage-contacting surface of said heat-sealed container is comprised of substantially uncrystalized glycol modified polyethylene terephthalate.

Claim 15

A method of making a heat-sealed, leak-tight container made from a foldable laminated blank and containing a predetermind quantity of a beverage, said method comprising the steps of: (a) bringing a film of glycol-modified polyethylene terephthalate in direct contact with the inner surface of a web of substrate material, thereby forming a laminate, said substrate material being selected from the group consisting of paper, paperboard, fiberboard, and bleached kraft paper; (b) applying heat and pressure to said laminate to bond said film of glycol-modified polyethylene terephthalate to said web of substrate material without causing crystalization of said glycol-modified polyethylene terephthalate, thereby forming a barrier laminate; (c) cutting a one-piece foldable container blank from said barrier laminate, said container blank including a multiplicity of side wall panels which are interconnected to one another, said container blank further including fold-in top and bottom closures secured to said side wall panels; (d) erecting said foldable container blank to form a tubular body of generally rectangular cross-section and heat-sealing said bottom closure and said side wall panels to one another by the application of heat and pressure without causing crystalization of said glycol-modified polyethylene terephthalate, said container being so erected and heat-sealed that said glycol-modified polyethylene terephthalate comprises the beverage-contacting surface of said container; (e) filling said beverage into said erected container; and (f) heat-sealing said top closure to form a leak-tight seal with said side wall panels by applying heat and pressure thereto without causing crystalization of said glycol-modified polyethylene terephthalate, whereby substantially all of said beverage-contacting surface of said heat-sealed container is comprised of substantially uncrystalized glycol modified polyethylene terephthalate.