| 摘要 |
<p>An extruder of the Tranfermix type comprises a barrel (2) in which a screw (1) rotates for transporting and mixing visco-elastic compounds. The extruder has an inlet, a compression section, a plasticizing section and an exit section. The plasticizing section is of the Transfermix type, in which a helical groove (3) in the screw (1) varies in cross section from full area to zero area, while the cross section of an oppositely handed helical groove (4) in the barrel (2) varies from zero area to full area. A return section (5) follows the plasticizing section, and the operative contact surface of the return section (5) is formed by a sleeve (7) which forms a cylindrical gap (8) between the sleeve (7) and the screw (1), the sleeve (7) being axially movable to close or open the gap to produce a continuously adjustable throttle.</p> |
