a method for forming a deep drawn paperboard container coated with a layer of grease and water impermeable polymeric material . a paperboard blank is disposed between and acted upon by a heated mandrel and a heated mold to form a container . the surface of the blank engageable by the mandrel bears the polymeric coating , and means are operative relatively to move the mandrel and mold toward one another , to engage , the blank , and , just prior to fully engaging the blank to set the same , to introduce a film of air between the heated mandrel and the polymer coated surface to ensure against sticking of the coating to the mandrel .