Barrier structure for food

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.

1 - 9 . (canceled)  
   
   
       10 . 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 to the paperboard substrate at coating weight of between about 3-5 pounds per 3000 square feet;    a tie layer applied to an inner surface of the nylon barrier layer; and,    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.    
   
   
       11 . The barrier laminate according to  claim 10  wherein the medium density polyethylene has an average density of between about 0.926 and about 0.940.  
   
   
       12 . The barrier laminate according to  claim 11  wherein the MDPE is applied in a coating weight of about 20 pounds per 3000 square feet.  
   
   
       13 . The barrier laminate according to  claim 10  further comprising a second layer of MDPE applied to the second surface of the paperboard substrate.  
   
   
       14 . 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; and,    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.    
   
   
       15 . The barrier laminate according to  claim 14  further comprising a tie layer connecting the inner nylon barrier layer surface to an outer surface of the MDPE product contacting layer.  
   
   
       16 . The barrier laminate according to  claim 14  wherein the medium density polyethylene barrier layer has an average density of between about 0.926 and about 0.94.  
   
   
       17 . The barrier laminate according to  claim 15  wherein the nylon barrier layer is applied at a coating weight of between about 3-5 pounds per 3000 square feet.  
   
   
       18 . The barrier laminate according to  claim 15  wherein the MDPE is applied at a coating weight of about 20 pounds per 3000 square feet.  
   
   
       19 . The barrier laminate according to  claim 14  further comprising a second layer of MDPE applied to the second surface of the substrate.