B - Operations – Transporting – 29 – C
Patent
B - Operations, Transporting
29
C
18/731
B29C 47/40 (2006.01) B29B 7/48 (2006.01) F01C 1/16 (2006.01) F04C 2/16 (2006.01)
Patent
CA 1055217
MULTI-SHAFT SCREW EXTRUDERS AND AN IMPROVED METHOD OF BUILDING UP PRESSURE Abstract of the Disclosure This invention relates to multi-shaft screw extruders in which the screw shafts are arranged to inter- mesh in pairs and rotate pairwise in the same sense, each shaft of a pair having at least one double threaded or triple threaded pressure build-up section corresponding to that of the other shaft. This invention also relates to a method of using such an extruder to build up pressure within a material with a minimum pressure build-up section and a minimum power input. The extruder and its method of operation are characterized by the fact that at least a portion of the pressure build-up section satisfys Image wherein t is the screw pitch, d is the internal diameter of the housing, q is the volumetric throughput of material of a screw pair and n is the speed of rotation of the screw shafts and h is the screw thread depth, and: Image wherein in triple thread pressure build-up sections A = 0.1082; a = 15.316; b = 69.111; and c = 261.85 and in double thread pressure build-up sections A = 0.206; a = 8.8212; b = 18.414; and c = 31.668.
235712
Aktiengesellschaft Bayer
Na
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