Planetary extruder for thermoplastics material

Details Planetary extruder for thermoplastics material Planetary extruder for thermoplastics material

B - Operations, Transporting

29

C

18/731

B29C 47/60 (2006.01) B29C 47/42 (2006.01)

Patent

CA 1130069

ABSTRACT OF THE DISCLOSURE: A planetary extruder for extruding thermoplastics materials having a main treaded spindle meshed with and sur- rounded 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 succes- sively shorter are followed by spindles which are successively longer.

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