Multi-shaft screw extruder

Details Multi-shaft screw extruder Multi-shaft screw extruder

F - Mech Eng,Light,Heat,Weapons

01

C

18/731

F01C 1/16 (2006.01)

Patent

CA 1085126

A MULTI-SHAFT SCREW EXTRUDER ABSTRACT OF THE DISCLOSURE The screw extruder is provided with screw shafts arranged so as to intermesh in pairs and rotate in pairs in the same sense, each screw shaft of a pair containing at least one double or triple threaded pressure build-up section corresponding to that of the other screw shaft. At least part of the pressure build-up sections have at least a ratio of screw pitch t to housing inner diameter d within the range: 0.7.f(h/d, .delta./d, q/nd3) <t/d< 1.8.f (h/d, .delta./d) q/nd3) in which q is the volume throughput of one screw pair, n is the screw shaft rotational speed, h is the thread depth, measured from the screw thread base to the housing inner wall, .delta. is the radial screw clearance between the screw crest and the housing inner wall and f is a function between the above values.

274309

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