Patent ID: 7445170
Filing Date: 2008-11-04
Classification: B29B,B29C,B29K,B29L,Y02W,Y10S

Abstract:
1. A process of making crumb and powder rubber comprising: (a) removing ferrous metal from a stream of granulated used rubber particles; (b) screening and removing fiber from said stream of granulated used rubber particles; (c) chilling said stream of screened granulated used rubber particles having a predetermined particle size range with a stream of a cryogenic liquid spray and a stream of a cryogenic gas flowing concurrently with said stream of said granulated used rubber particles wherein the final chilled temperature of said rubber particles is controlled with the proviso that said ferrous metal and fiber are removed from said screened granulated used rubber particles subsequent to said step (b) but prior to said step (c); (d) grinding said stream of chilled granulated used rubber particles by varying impact speed wherein said particle size distribution of said ground rubber particles is controlled; and (e) screening said ground rubber particle stream into desired crumb and/or powder rubber particle size ranges.