Paperboard, paperboard container, and method for using a paperboard article

Abstract

A method for using a paperboard article includes heating a paperboard article by way of microwave radiation. The paperboard article includes a paperboard substrate having a first major side and a second major side and one or more high-density polyethylene layers on at least one of the first major side and the second major side of the paperboard substrate.

What is claimed is: 
     
         1 . A method for using a paperboard article, the method comprising:
 heating a paperboard article by way of microwave radiation, said paperboard article comprising:   a paperboard substrate having a first major side and a second major side; and   one or more high-density polyethylene layers on at least one of said first major side and said second major side of said paperboard substrate.   
     
     
         2 . The method of  claim 1  wherein said paperboard substrate includes at least one of a coated natural kraft board, a solid bleached sulfate board, a solid unbleached sulfate board, a coated recycled board, a coated white lined chipboard, and a folding boxboard. 
     
     
         3 . The method of  claim 1  wherein said paperboard substrate has a caliper thickness in a range of 7 points to 30 points. 
     
     
         4 . The method of  claim 1  wherein at least one high-density polyethylene layer has a density in a range of between 0.93 and 0.97 g/cm 3 . 
     
     
         5 . The method of  claim 1  wherein at least one high-density polyethylene layer has a melt index of greater than 0.3 g/10 min (190° C./2.16 kg). 
     
     
         6 . The method of  claim 1  wherein a food product is on a surface of said paperboard article during said heating of said paperboard article. 
     
     
         7 . The method of  claim 1  wherein said paperboard article is in a configuration of a container. 
     
     
         8 . A paperboard container comprising:
 a paperboard substrate having a first major side facing an interior of said paperboard container and a second major side facing an exterior of said paperboard container; and   one or more high-density polyethylene layers directly on said first major side of said paperboard substrate.   
     
     
         9 . The paperboard container of  claim 8  wherein said paperboard substrate is disposed at an outermost surface of said second major side of said paperboard. 
     
     
         10 . The paperboard container of  claim 8  further comprising one or more high-density polyethylene layers on said second major side of said paperboard substrate. 
     
     
         11 . The paperboard container of  claim 8  further comprising a clay coating layer on said second major side of said paperboard substrate. 
     
     
         12 . The paperboard container of  claim 11  further comprising one or more high-density polyethylene layers on said clay coating layer. 
     
     
         13 . The paperboard container of  claim 8  wherein said paperboard substrate has a caliper thickness in a range of 7 points to 30 points. 
     
     
         14 . The paperboard container of  claim 8  wherein at least one high-density polyethylene layer has a density in a range of between 0.93 and 0.97 g/cm 3 . 
     
     
         15 . The paperboard container of  claim 8  wherein at least one high-density polyethylene layer has a melt index of greater than 0.3 g/10 min (190° C./2.16 kg). 
     
     
         16 . The paperboard container of  claim 8  wherein said paperboard container is in a configuration of a cup or a bowl. 
     
     
         17 . The paperboard container of  claim 8  wherein said paperboard container includes a food product contained in an internal volume of said paperboard container and a lid sealing said internal volume of said paperboard container. 
     
     
         18 . The paperboard container of  claim 17  wherein indicia on an exterior of said paperboard container or on a packaging material attached to said paperboard container includes instructions for heating said food product by way of microwave radiation. 
     
     
         19 . A paperboard consisting of:
 a paperboard substrate having a first major side and a second major side;   one or more high-density polyethylene layers on one or both of said first major side and said second major side of said paperboard substrate; and   optionally, a clay coating layer between said paperboard substrate and said one or more high-density polyethylene layers on one or both of said first major side and said second major side of said paperboard substrate.   
     
     
         20 . The paperboard of  claim 19  wherein said paperboard substrate has a caliper thickness in a range of 7 points to 30 points. 
     
     
         21 . The paperboard of  claim 19  wherein at least one high-density polyethylene layer has a density in a range of between 0.93 and 0.97 g/cm 3 . 
     
     
         22 . The paperboard of  claim 19  wherein at least one high-density polyethylene layer has a melt index of greater than 0.3 g/10 min (190° C./2.16 kg).