Threaded multi start screw and barrel transfermixer

B - Operations – Transporting – 01 – F

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259/43.2

B01F 7/08 (2006.01) B29B 7/42 (2006.01) B29C 47/38 (2006.01) B29C 47/92 (2006.01)

Patent

CA 1077922

A B S T R A C T A continuous mixer comprising at least one mixing zone formed by a Transfermix geometry in which the number of starts of the helical thread changes for each of the components along the length of said Transfermix zone in the opposite sense to the change of the cross-sectional area of helical grooves on said component, whereby when in operation a medium moves along said Transfermix zone, portions thereof are successively transferred between the grooves of facing helical threads as giver and taker and whereby grooves of larger cross-sectional area are of greater widths than grooves of small cross-sectional area; in a preferred embodiment the mixer has a driven rotor and stationary barrel, the helical threads thereon being of opposite hand and the number of starts facing one another at any cross-section of the Transfermix zone is such as to make a substantially constant product. -1-

281988

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