Continuous process for extruding rubber powder

摘要

A twin screw extruder (I) for the extrusion of powdered or granulated rubber (II) has a screw configuration in which dispersion mixing and distribution mixing elements are separated by a conveying element containing cooling and dosing zones with optionally return elements situated in the mixing zone. An Independent claim is included for a one step continuous process for mixing and extrusion of a vulcanizable rubber mixture (III) using a twin screw extruder (I) by dosing the rubber (II) with optionally filler and other non-crosslinkable additives into the extruder, mixing the components in a dispersive mixing zone, conveying to a cooling zone, preferably containing dosing and deairing equipment, adding vulcanization agents to the cooling zone or to a distributive mixing zone, mixing in the distributive mixing zone and optionally passage through an appropriate conveying profile and pressure build-up to extrude in the desired form.