Screw Extruder Working For Plastic Composition

Single Screw extruder for working plastic compositions

, especially polymers and rubber mixtures having a cylinder in which a motor-driven screw is disposed. The cylinder being provided with pins which are disposed in planes perpendicular to the cylinder axis and can be pushed radially through openings in the cylinder wall, and the screw being provided in the pin planes with gaps in the screw spirals. The object of the invention is to create a practically achievable and economical possibility for the shifting and depth adjustment of pins in screw extruders. A plurality of pins, lying in an axis parallel row, are fastened to a beam at the extremities projecting from the extruder cylinder.

The invention relates to a single screw extruder for working plastic compositions, especially polymers and rubber mixtures, consisting of a cylinder in which a motor-driven screw is disposed, the cylinder of which is provided with pins which are arrayed in several planes perpendicular to the cylinder axis and can be inserted radially through openings in the cylinder wall, and the screw is provided in the spirals of the screw with gaps disposed in the planes of the pins.

The invention consists in fastening a plurality of pins situated in an axis-parallel row with the ends that project outwardly from the extruder cylinder fastened to a beam.

The radially disposed pins of a single screw extruder cylinder or battery of extruder cylinders are driven in common in rows, as seen in the axial direction, each row having a longitudinal beam to which the pins of a row are fastened. This movement of the pins coupled to a beam can be performed either mechanically by means of levers or cams, or screws or other common machine elements. Preferably, however, each beam will be driven by servo motors, using either pneumatic or hydraulic or even electromechanical servo motors; in other words, pneumatic or hydraulic piston-and-cylinder units, or spindles driven by electric motors or hydraulic power, for example. Since these elements act each on an entire row of pins, the result is a considerable saving in cost, great uniformity in the selected depth adjustment, and a reliable control of the pin depth. If a conventional single screw extruder extruder cylinder has, for example, eight pins in a plane, and has, for example, twelve planes of pins, it does not need 96 hydraulic cylinders plus complicated controls and coupling means, but only eight adjusters for the eight beams bearing these three rows of pins.

by: ericfu

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