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United States Patent 4538917
Douris , ê et al. September 3, 1985

Screw Extruder

Harms September 3, 1985

Abstract

A screw extruder for mixing, homogenizing, and degassing highly viscous rubber mixtures and similarly acting thermoplastics. The extruder has mixing pins associated with the housing in the mixing and homogenizing zone, and degassing pins associated with the housing in the degassing zone. The degassing pins have passages or channels through which gases and vapors are withdrawn. The retaining or damming structure at the entrance to the degassing zone can also be formed of pins associated with the housing. The conveyed material is mechanically and thermally satisfactorily made uniform by the inventive pin arrangement without material shearing forces, and can also be effectively and favorably degassed. High flow-through rates of the material can be achieved with high product quality.