The following companies might have ranked on our master chart; however, the relevant, verifiable data needed to include them was unavailable by press time.
James River Corp. (Richmond, Va.) - James River has 37 thermoforming lines at five North American plants. Four of the plants make plastic cups and lids; one in Williamsburg, Va., makes food packaging.
Sweetheart Cup Co. Inc. (Chicago) - Sweetheart, with annual sales of about $850 million, is a major manufacturer of thermoformed packaging. However, a large portion of the company's sales are generated by paper products.
Dart Container Corp. (Mason, Mich.) - Primarily a manufacturer of expanded polystyrene cups, Dart has significant thermoforming operations, primarily to make cup lids.
Solo Cup Co. (Chicago) -Three of Solo's 10 plants make thermoformed products using PET, polystyrene and polypropylene. But the company also has a large paper products business.
Packaging Corp. of America (Northbrook, Ill.) - PCA, a unit of Houston-based Tenneco Inc., makes thermoformed cups, lids and packaging, as well as paper and foil packaging products.