| 摘要 |
1,274,907. Screw mixers. R. P. FRITSCH. 14 Aug., 1969 [14 Aug., 1968], No. 40694/69. Heading B1C. [Also in Division B5] A single or multiple-intermeshing screw mixer or extruder has two inlets 1, 2 and a controllably variable throttling section 4 which generates back-pressure in a zone extending upstream at least as far as the downstream edge of the inlet 1. In operation the screw(s) are rotated at a constant speed and the primary component is fed ad lib to the inlet 1 and will be taken up at a rate dependent on the back pressure. Conventional means (not described) are provided to meter other mixture components into the inlet 2, downstream of the throttling section 4, in dependence upon the rate of introduction of the primary component. As shown a slide 6 enables both the throttling section 4 and the position of the downstream edge of the inlet 1 to be adjusted. There are cavities 8 for a heating or cooling medium. The principal component in the form of slabs may be fed by a vacuum lift and cutter both photo-or electrically - controlled. Multiple screws are preferably co-rotating.
|
