Methods of constructing paddle and shaft assemblies for twin screw mixer and/or processors and the resulting apparatus

摘要

Shaft and paddle assembly for mixer or processor having radially aligned paddles on parallel shafts co-rotating at the same speed and co-wiping and wiping the interior of a mixing chamber is constructed or reconstituted by forming co-wiping paddles with paddle bores (BR) having alternating lobular projections and root recesses with tangential arcuate corner portions. The paddles are mounted on shafts with intermeshing matching projections and root recesses which are installed in spaced parallel relation, concentrically in the mixer barrel bores, their axis being spaced a predetermined centre-to-centre distance apart to achieve complete mixer chamber wiper with the paddles.