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United States Patent 4872761
Douris , ê et al. October 10, 1989

Extrusion Apparatus

Geyer October 10, 1989

Abstract

The apparatus is for the mixing and refining of rubber-like materials, either hot or cold feed, and some thermoplastic materials. It comprises an elongated cylindrical barrel member and an elongated rotor member, disposed coaxially in the interior of said barrel member. The rotor member is provided with a concentric bore, at its downstream end in which a stationary screw-like member is coaxially disposed. Means are provided for relative rotational movement of the rotor member, to the barrel member and to the stationary screw-like member in the treating and axial advancement of the process material. With such a construction, the barrel, rotor and screw-like members have a feed end, a forcing zone, a mixing and refining zone, a stationary screw-like member and discharge end, interposed between the ends of the apparatus. The rotor member of the forcing zone is provided with extrusion grooves or groove, capable of warming, pressurizing and transporting the process material to the mixing and refining zone. The rotor groove which is the continuation of the forcing zone groove design is provided with a two part groove design. The leading portion of the groove design consists of a deep, high lead, or longitudinal extrusion groove, which starts deep, at full extrusion capacity, and progressively decreases in capacity to essentially zero, at the trailing portion of said mixing and refining zone. The trailing portion of the two part groove design, connects with the downstream edge of the leading portion, by means of the shallow opening as formed by the leading end of the groove or channel, from where the process material is directed in a circumferential direction, along the channel, which progressively diminishes in depth to a minimum depth restrictive opening or openings which, retard the flow of oversize and less fluent process material, and direct the fine and fluent process material to numerous ports commuting between leading in a radial direction to a concentric bore of the rotor member. The concentric bore is provided with a stationary screw-like member, which receives the process material from the numerous ports and by means of an extruder groove configuration, reacts to the rotation of the rotor bore and extrudes the process material out of the end of the extruder.