| 摘要 |
<p>A planetary extruder for extruding thermoplastics materials having a main treaded spindle meshed with and surrounded by threaded planetary spindles. To improve pull-in of material, the planetary spindles are provided in groups, each group comprising at least three spindles. The first planetary spindle of each group corresponds in length to the main spindle and succeeding spindles, considered in a direction opposite to the direction or orbital movement of the planetary spindles, of each group are each shorter than the spindle which immediately precedes it to form receiving chambers for material fed by a feed screw. In one embodiment, the spindles which are successively shorter are followed by spindles which are successively longer.</p> |
