IMPROVED SURFACE QUALITY OF URETHANE CASTINGS
Original Publication Date: 1990-Jun-30
Included in the Prior Art Database: 2004-Apr-05
Xerox Disclosure Journal
Cleaning blades used in electrostatographic printing machines are frequently made from polyurethanes in a spin cast molding technique where the spin casting drum generally has a rough surface and is first sprayed or coated with a silicone or fluorocarbon mold release material such as polytetrafluoroethylene. Since the mold release material becomes part of the molded surface of the blades difficulties in adhering the blade to holders or other attachments are experienced. Furthermore, the rough surface on the drum results in scratches and striations in the blade surface. As a result only one edge of the blade can be used. These difficulties can be overcome and both edges of the blade may be used by using a smooth polished stainless steel spin casting drum and an oleophobic-hydrophobic fluoro acrylate surface modifier applied as a thin layer to the stainless steel drum. FC-723 FLUORAD Brand Surface Modifier having a surface tension of about 12 dynes/cm is such a modifier commercially available from 3M.