Extrusion process and single, dual or multiple-worm extruder

Details Extrusion process and single, dual or multiple-worm extruder Extrusion process and single, dual or multiple-worm extruder

B - Operations, Transporting

29

C

18/730

B29C 47/76 (2006.01) B29C 47/74 (2006.01)

Patent

CA 1314675

ABSTRACT OF THE DISCLOSURE: In the case of the extruder, the thread of the worm, or that of the worms, is partly left-handed and partly right-handed, so that one part of the material to be processed is conveyed in direction A, while the other part is conveyed in the opposite direction B. The process is a degasifying-extrusion-process and the extruder is a degasifying extruder: the following are provided: a reverse-degasifying arrangement at the end of the worm, or worms, if the material to be processed is carried away from this end, and/or a reverse-degasifying arrangement at the location between the threaded sections of the worm, or worms, whence the material to be processed is carried away in opposite directions B and A. According to the invention: continuous operation is possible, no dead areas and break- away edges are formed, the reverse-degasifying arrangement is easily sealed off against any ingress of oxygen, and products sensitive to heat and oxidation, such as polyamide- 66, may also be produced, without damage, in continuous operation; example: synthetic-fibre extrusion-spinning.

575319

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