Patent ID: 6719943
Filing Date: 2004-04-13
Classification: B29C,B29D,B29K,B65D,Y10T

Abstract:
A process for forming a microwaveable, food contact compatible, disposable, rigid and strong, mica-filled polyolefin container wherein the polyolefin is chosen from at least one of polypropylene and polypropylene polyethylene copolymer or blend, comprising the steps of:(a) forming an extrudable admixture of the polyolefin resin and mica; (b) extruding said extrudable admixture of the polyolefin resin and mica at elevated temperature; (c) passing the resulting extruded admixture of the polyolefin resin and mica through a multiple roll stack of rolls, at least one roll of said stack having a matte finish; (d) passing said extruded admixture of the polyolefin resin and mica at least partially around said roll having a matte finish; (e) controlling the speed of said extrusion process, the size, temperature and configuration of said roll stack such that the surface of said extruded admixture of the polyolefin resin and mica in contact with said matte roll has a matted structure; (f) thermoforming said extruded admixture of the polyolefin resin, and mica; and (g) recovering a container having a micronodular surface and a coarse surface.