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Internally conical flights are used for screw conveyors with conical center shaft or pipe.

  • Screws with gradually increasing center shaft diameter are suitable for compressing material.
  • Whereas screws with gradually decreasing center shaft diameter provide more and more space for the material, preventing material buildup, without increasing operating speed.
  • Increased operating speed is usually used to prevent material buildup on screws with increased pitches.
  • Production and final fitting will be significantly facilitated, if the shaft is available.