Patent ID: 6766963
Filing Date: 2004-07-27
Classification: B29B,B29C,B29K,B29L,C08J,C08L,E01B,Y02W

Abstract:
A method for producing a crosstie made substantially from recycled rubber comprising the steps of:providing vulcanized recycled crumb rubber and natural recycled crumb rubber; mixing by weight 10-35% said natural recycled crumb rubber and 65-90% said vulcanized crumb rubber to form a blend; and adding a strength enhancing polymer to said blend, the amount of polymer to add is between 0.0-0.5% of the total weight of said blend; milling said blend at between 240 degrees F. and 370 degrees F. (116-188 deg C.) to form an intermediate product; extruding said intermediate product at between 240 degrees F. and 370 degrees F. (116-188 deg C.) to form an extrusion having a specific width and depth; and, thereafter cutting said extrusion at intervals to yield the croestie having the desired length.