Examples of suitable materials for use as the web 80 include but are not limited to polyolefins such as polyethylenes, including linear low density polyethylene, low density polyethylene, ultra low density polyethylene, high density polyethylene, and polypropylene; metallocene catalyst-based polymers; nylon (polyamide); cellulose esters; poly (methyl methacrylate); polystyrene; poly (vinyl chlorid