Liner structures

Abstract

A flexible liner is provided. The flexible liner is formed from a sheet or web of a polymer which is soft and has non-skid properties. The flexible liner has upwardly extending ridges on its top surface which are formed from a polymer which has a higher Shore A hardness than the web. The bottom side of the liner can have ridges and valleys or can be flat.

What is claimed is:  
     
         1 . A liner structure comprising a flexible sheet having a top surface and a bottom surface, said flexible sheet being comprised of a first polymeric resin which is sufficiently soft to render the flexible sheet non-curling and the bottom surface non-skid, and a plurality of upwardly extending ridges on the top surface of the flexible sheet, said upwardly extending ridges being comprised of a second polymeric resin which is harder than the first polymeric resin and which provides a low friction surface on the top edges of said upwardly extending ridges.  
     
     
         2 . The liner structure of    claim 1    wherein the bottom surface of the flexible sheet is substantially flat.  
     
     
         3 . The liner structure of    claim 1    wherein the bottom surface of the flexible sheet is undulating.  
     
     
         4 . The liner structure of    claim 1    wherein the bottom surface of the flexible sheet is comprised of a plurality of downwardly extending ridges comprised of said first polymeric resin.  
     
     
         5 . The liner structure of    claim 4    wherein the downwardly extending ridges are flat or rounded.  
     
     
         6 . The liner structure of    claim 4    wherein the downwardly extending ridges are directly underneath and parallel to said upwardly extending ridges.  
     
     
         7 . The liner structure of    claim 1    wherein the upwardly extending ridges are straight and parallel to each other.  
     
     
         8 . The liner structure of    claim 1    wherein the first polymeric resin is comprised of plasticized polyvinyl chloride.  
     
     
         9 . The liner structure of    claim 1    wherein the second polymeric resin is comprised of polyvinyl chloride.  
     
     
         10 . The liner structure of    claim 1    wherein both the first polymeric resin and the second polymeric resin are comprised of polyvinyl chloride, the first polymeric resin being more highly plasticized than the second polymeric resin.  
     
     
         11 . The liner structure of    claim 1    wherein the upwardly extending ridges have a triangular profile.  
     
     
         12 . The line structure of    claim 1    wherein the second polymeric resin is harder than the first polymeric resin by at least 3 Shore A Hardness units.