Rubber recycling is also very im portant environmental issue. A single screw
extrusion process as a continuous rubber recycling technology has been investigated for
the reversion o f natural rubber crumb. V arious single screw extruder operating
conditions lead to different degrees o f devulcanization. The effect o f screw speed and
processing temperature on the degree o f devulcanization was investigated. In general, for
continuous reversion o f natural rubber compounds, the temperature of the extruder
appears to play a much more important role than the screw speed.