Extrusion coated paper for flexible packaging

Abstract

A barrier laminate for a paper substrate and a pouch formed from the paper substrate is provided. The paper substrate and pouch are suitable for packaging of food products and utilizes a 40-60% hardwood fiber content paper sheet having nylon barriers and EVOH barriers applied to a food contact surface of the paper.

That which is claimed: 
     
         1 . A pouch comprising:
 a tubular structure having upper and lower ends, the upper and lower ends being sealable, front and back walls joined at opposite bag size by at least two side seams running the length of the bags;   the bag substrate being paper and having a ground hardwood fiber content of at least about 50%;   a barrier coating applied to a first structure of the paper, the barrier coating applied to the first surface of the paper in the order of 5#Nylon, 3#EVOH, 3#Tie, and 17#LDPE.   
     
     
         2 . The pouch according to  claim 2  wherein the paper has a second surface which is clay coated. 
     
     
         3 . A barrier laminate for a paper substrate comprising:
 a paper sheet having an exterior surface and an interior food contact surface;   a barrier coating applied directly to the interior surface in the order of 2-8#Nylon, 1-5#EVOH, a Tie layer, and 10-12#LDPE.   
     
     
         4 . A barrier laminate for a paper substrate comprising:
 a paper sheet, having an exterior surface and an interior food contact surface;   a barrier coating applied directly to the interior surface in the order of Nylon, EVOH, tie, & LDPE.   
     
     
         5 . The paper substrate according to  claim 4  wherein the nylon is present at a range of between 2-8#, the EVOH is present at a range of between 1-5#, the tie layer is present between 1-5# and the LDPE is present between 10-20#. 
     
     
         6 . The paper substrate according to  claim 5  wherein the LDPE is a blend of a blend of metallocene LLDPE and LDPE.