Importance

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Abstract

An extrusion apparatus for processing, mixing and extruding thermoplastic and rubber materials includes a feed hopper feeding two barrier type extruders. Extrusion rotors include diagonal grooves with a barrier that has a restrictive clearance or gap relative to the extruder barrel bore. Fine material can pass through this gap, but larger material is led to a downstream end of the grooves. An abrasive barrel surface opposite the downstream end of the grooves grinds this larger material until it can pass or lead off through the smaller gap. Stationary knives located downstream of the abrasive section cut the exiting material into flakes. The barrel and barrier sections are conical and the size of the gap can be changed by relative movement between the barrel and the barriers. The extruders can operate adiabatically so that there is no change in extrusion temperature with speed and the volume of process flow.

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First Claim