Patent ID: 6224805
Filing Date: 2001-05-01
Classification: B29C,C09K,Y10T

Abstract:
A method for producing high quality plastic sheet, comprising the steps of:a) providing molten plastic resin;b) directing the molten plastic resin to an overflow die having an inlet, an outlet, an overflow surface formed by the exterior and a pair of die lips, two exterior sides connected to the overflow surface and an apex formed by the confluence of the two exterior sides and located in substantial opposition to the overflow surface;c) shaping the molten plastic resin into a molten web wherein the molten plastic resin exits the overflow die through the outlet, flows around the two exterior sides and converges at the apex form the molten web;d) guiding said molten web away from said overflow die by a takeoff means; ande) cooling said molten web to form a solid sheet, wherein only outer edges of the molten web are contacted by the takeoff means.