A screw nose for a rubber extruder screw has an upstream portion of increasing
diameter providing working engagement of the rubber flowing from the screw with
the extruder barrel and a downstream portion of decreasing diameter providing working
engagement of the rubber with a converging tapered wall of a flow channel block
for reducing the shrinkage and pressure drop at the discharge end of the screw
and thereby prevent porosity and blisters in an extruded rubber component.
