Abstract: A single-screw extruder and process for mixing viscous materials, for example, rubber mixtures and thermoplastic materials. The process and apparatus includes inserting a plurality of obstacles in the flow path of the material stream in the interior of the extruder cylinder. The obstacles are in the form of a number of series of studs protruding into the cylinder and accommodated by respective gaps or openings in the threads of the screw. The depth of penetration as well as the number of studs can be varied and adjusted by automatic means. The penetrating portion of the studs can be of different shapes according to the requirements for a thorough and turbulent deflection and mixing of the material stream.

Abstract: A single-screw extruder and process for mixing viscous materials, for example, rubber mixtures and thermoplastic materials. The process and apparatus includes inserting a plurality of obstacles in the flow path of the material stream in the interior of the extruder cylinder. The obstacles are in the form of a number of series of studs protruding into the cylinder and accommodated by respective gaps or openings in the threads of the screw. The depth of penetration as well as the number of studs can be varied and adjusted by automatic means. The penetrating portion of the studs can be of different shapes according to the requirements for a thorough and turbulent deflection and mixing of the material stream.