Packaging laminate for bags

Abstract

The present invention relates to improved cover laminates with high performance for forming covers for industrial packaging. The laminates include substantially one layer of metallized polyester, and one or two layers of a special polyethylene layer supplied as a crossed film. The laminate may be made by an extrusion process carried out at 300° C. , by glue lamination, or a combination of the two.

We claim:  
     
         1 . A packaging cover, comprising at least: 
 a crossed film with a layer weight in the range 45 and 300 g/sqm,    a substantially gas-impermeable film, and    a strong printable laminate,    wherein the crossed film is a biaxially-stretched laminated film of at least three plies of polyolefins, so as to obtain by laminating and stretching an interlock arrangement, the inner portion of the laminated film being present at 70-80% and comprising a mixture of olefins, the inner portion including at least one non-outer plies of the laminated film.    
     
     
         2 . A packaging cover according to  claim 1 , wherein the strong printable laminate is a second crossed film.  
     
     
         3 . A packaging cover according to  claim 1 , wherein the strong printable laminate is a polyester laminate.  
     
     
         4 . A packaging cover according to  claim 1 , wherein the strong printable laminate is formed from a material in the group consisting of polyethylene terephthalate (PET) or a polyethylene naphtenate (PEN) laminates.  
     
     
         5 . A packaging cover according to  claim 1 , wherein the strong printable laminate is metallized.  
     
     
         6 . A packaging cover according to  claim 1 , wherein the crossed film has a layer weight in the range of 70-180 gm/sgm.  
     
     
         7 . A packaging cover according to  claim 1 , wherein the substantially gas-impermeable film includes an aluminum foil having a thickness in the range of 7-25 μm.  
     
     
         8 . A packaging cover according to  claim 1 , wherein the substantially gas-impermeable film comprises a laminate of one of EVOH and ACLAR.  
     
     
         9 . A packaging cover according to  claim 1 , further comprising a tie-layer between the crossed film and the substantially gas-impermeable film.  
     
     
         10 . A packaging cover according to  claim 1 , further comprising a tie-layer between the substantially gas-impermeable film and the strong printable laminate.  
     
     
         11 . A packaging cover according to  claim 9  or  10 , wherein the tie-layer is formed with a mixture of a polymer blend of Borealis LE7530 and standard LDPE.  
     
     
         12 . A packaging cover according to  claim 11 , wherein the mixture of polymer blend Borealis LE7530 and standard LDPE is present in a ratio of 50150%.  
     
     
         13 . A packaging cover according to  claim 11 , wherein the mixture of polymer blend borealis LE7530 and standard LDPE is present in a ratio of 25/75%.  
     
     
         14 . A packaging cover, comprising: 
 a metallized polyester laminate;    a first low density polyethylene (LDPE) laminate over the metallized polyester laminate;    an aluminum foil over the first LDPE laminate;    a second LDPE laminate over the aluminum foil; and    a crossed film over the second LDPE laminate, the crossed film being a biaxially-stretched laminated film of polyolefins, so as to obtain by laminating and stretching an interlock arrangement, an inner portion of the crossed film being present at 70-80%, comprising a mixture of olefins, the inner portion including non-outer layers of the crossed film.    
     
     
         15 . A packaging cover, comprising a metallized polyester laminate; 
 a first LDPE layer over the metallized polyester laminate;    a first crossed film layer over the first LDPE layer;    a second LDPE layer over the first crossed film layer;    an aluminum foil over the second LDPE layer;    a third LDPE layer over the aluminum foil; and    a second crossed film including a biaxially-stretched laminated film of polyolefins, so as to obtain by laminating and stretching an interlock arrangement, an inner portion of the second crossed film being present at 70-80%, comprising a mixture of olefins, the inner portion including non-outer layers of the crossed film.    
     
     
         16 . A packaging cover according to  claim 1 , wherein adjacent layers are secured together by extrusion.  
     
     
         17 . A packaging cover according to  claim 1 , wherein adjacent layers are secured together by a glue lamination.  
     
     
         18 . A packaging cover according to  claim 1 , wherein adjacent layers are secured together both by extrusion and a glue lamination.