High-barrier liner for beaded composite can

Abstract

A high-barrier liner for a composite container for products comprises a tubular body member comprising at least one paperboard body ply having an inner surface. The composite container further comprises a liner ply adhered to the inner surface of the tubular body member. The liner ply comprises a metallized film disposed between inner and outer sealant layers. The metallized film comprises a polymer film substrate and a vapor-deposited metal layer on one surface of the substrate. The metallized film is advantageously oriented such that the metal layer of the metallized film faces towards an interior of the composite container.

1 . A composite container for products comprising: 
 a tubular body member comprising at least one paperboard body ply and having an inner surface; and    a liner ply adhered to the inner surface of the tubular body member and comprising a metallized film disposed between an inner sealant layer and an outer sealant layer, the metallized film comprising a polymer film substrate and a vapor-deposited metal layer on one surface of the substrate, wherein the metallized film is oriented such that the metal layer of the metallized film faces towards an interior of the composite container.    
   
   
       2 . A composite container according to  claim 1 , wherein the metallized film comprises metallized polyethylene.  
   
   
       3 . A composite container according to  claim 1 , wherein the metallized film comprises metallized polypropylene.  
   
   
       4 . A composite container according to  claim 1 , wherein the metallized film comprises metallized polyester  
   
   
       5 . A composite container according to  claim 1 , wherein the metallized film comprises metallized polyethylene terephthalate.  
   
   
       6 . A composite container according to  claim 1 , wherein the liner ply further comprises a second metallized film disposed between the metallized film and the inner sealant layer.  
   
   
       7 . A composite container according to  claim 1 , wherein the inner sealant layer is attached to the metal layer of the metallized film and the outer sealant layer is attached to both an opposite surface of the metallized film and the inner surface of the paperboard body ply.  
   
   
       8 . A composite container according to  claim 7 , wherein the metallized film is adhesive laminated to the inner sealant layer.  
   
   
       9 . A composite container according to  claim 7 , wherein the metallized film is extrusion laminated to the inner sealant layer.  
   
   
       10 . A composite container according to  claim 7 , wherein the inner sealant layer is extrusion coated on the metallized film.  
   
   
       11 . A composite container according to  claim 7 , wherein the outer sealant layer is extrusion coated on the metallized film.  
   
   
       12 . A composite container according to  claim 7 , wherein the outer sealant layer is integral with the metallized film.  
   
   
       13 . A composite container according to  claim 1 , wherein each of the inner and outer sealant layers comprises at least one of polypropylene, ionomer resin, high density polyethylene, low density polyethylene, linear low-density polyethylene, metallocene catalyzed polyolefins, ethylene-methyl acrylate, and copolymers, coextrusions, and blends thereof.  
   
   
       14 . A composite container according to  claim 1 , wherein the inner layer comprises ethylene acid copolymer having acid groups partially neutralized by zinc or sodium ions.  
   
   
       15 . A composite container according to  claim 1 , wherein the liner ply further comprises a protective coating applied over the metal layer of the metallized film, the protective coating disposed between the metallized film and the inner sealant layer.  
   
   
       16 . A composite container according to  claim 1 , wherein the metallized film further comprises an adhesion-promoting material applied between the polymer film substrate and the metal layer to promote adhesion of the metal layer to the substrate.  
   
   
       17 . A composite container according to  claim 1 , wherein a top end of the tubular body member is rolled outwardly to form a rim on which the liner ply is exposed.  
   
   
       18 . A composite container according to  claim 17 , further comprising a lid heat-sealed to the rim.