Coated Corrugated Paper Beverage Can and Method for Making a Corrugated Paper Beverage Can

Abstract

A method for manufacturing biodegradable corrugated paper beverage containers configured to withstand internal pressure from carbonated beverages without changing the shape of the container is provided. The containers are made from a paper material treated with a barrier coating to prevent leakage and are formed into can shapes with corrugated-style ridges for improved structural integrity.

What is claimed is: 
     
         1 . A can for holding a beverage, comprising:
 a top having a top edge;   a bottom having a bottom edge;   a paper stock wall having an upper edge and a lower edge, said paper stock wall being tube shaped with an interior surface, said upper edge contacting said top edge and said lower edge contacting said bottom edge; and   a waterproofing composition being applied to said interior surface.   
     
     
         2 . The can according to  claim 1 , wherein said waterproofing composition is applied to a top seam formed along said top edge and said upper edge. 
     
     
         3 . The can according to  claim 1 , wherein:
 said paper stock wall has an outer surface; and   said waterproofing composition is further applied to said outer surface.   
     
     
         4 . The can according to  claim 1 , wherein:
 said top edge has a top rim; and   said upper edge is tucked within said top rim.   
     
     
         5 . The can according to  claim 1 , wherein said tube shape has a frustoconical top portion. 
     
     
         6 . The can according to  claim 1 , wherein:
 said top is paper stock; and   said top is treated with said waterproofing composition.   
     
     
         7 . The can according to  claim 6 , wherein:
 said bottom is paper stock; and   said bottom is treated with said waterproofing composition.   
     
     
         8 . The can according to  claim 1 , wherein said waterproofing composition includes:
 95-99.6% by volume of rice-bran wax; and   0-4.6% by volume of sugarcane wax;   said rice-bran wax and said sugarcane wax totaling no more than 99.6% by volume of said waterproofing composition.   
     
     
         9 . The can according to  claim 1 , wherein said waterproofing composition further includes a surfactant. 
     
     
         10 . The can according to  claim 9 , wherein said surfactant is calcium stearate. 
     
     
         11 . The can according to  claim 1 , wherein said paper stock wall has a plurality of vertical creases running from said top to said bottom. 
     
     
         12 . The can according to  claim 1 , wherein said paper stock wall includes a single layer of paper stock. 
     
     
         13 . The can according to  claim 1 , wherein said paper stock wall includes at least two layers of paper stock. 
     
     
         14 . The can according to  claim 1 , wherein said paper stock wall is made of corrugated paper, said corrugated paper includes two linerboards and a fluted corrugated sheet being disposed between said two linerboards, said fluted corrugated sheet being adhered to said two linerboards. 
     
     
         15 . A method for forming a can, which comprises:
 providing a sheet of paper stock;   corrugating said paper stock to form a corrugated paper stock sheet;   cutting a corrugated wall shaped sheet from said corrugated paper stock sheet;   bending said wall shaped sheet into a corrugated tube shaped wall with an upper edge, a lower edge, and an inner surface;   attaching a top edge of a top to said upper edge;   attaching a bottom edge of a bottom to said lower edge; and   applying a coating to said inner surface.   
     
     
         16 . The method according to  claim 11 , which further comprises applying said coating to a joint between said top edge and said upper edge. 
     
     
         17 . The method according to  claim 11 , which further comprises applying said coating to an outer surface of said corrugated tube shaped wall.