METHOD FOR PREVENTING WRAPPING OF EXTRUDATE ON NIP ROLL
Original Publication Date: 1996-Feb-29
Included in the Prior Art Database: 2004-Apr-07
Xerox Disclosure Journal
Proposed is a method for preventing the adhesion of extrudate to a nip roll. Referring to the accompanying figure, there is shown an extrusion system 10 comprising a heated extruder barrel 12, nip rolls 16 and 18, belt 22, and a sprayer 20. When belt 22 is used as a post extrusion cooling station, extrudate 14 frequently wraps around one of the rolls 16 and 18. Wrapping occurs when the extrudate 14 melt temperature is, for example, at approximately 420 degrees Fahrenheit for extruding xerographic toners. Most likely, the extrudate 14 will wrap around the lower roll 18 rather than the upper roll 16. Observations indicate that the adhesion of extrudate 14 to roll 18 prevails during winter months when the dew point temperature of the ambient is lower than that at the surfaces of rolls 16 and 18.