B - Operations – Transporting – 02 – C
Patent
B - Operations, Transporting
02
C
92/52
B02C 19/22 (2006.01) B01F 7/04 (2006.01) D21B 1/02 (2006.01) D21B 1/16 (2006.01) D21C 7/00 (2006.01)
Patent
CA 1307416
ABSTRACT In a method and an apparatus for mixing chemicals into a fibre pulp, the pulp passes in a space between a fixed casing and a rotating device through three treatment sec- tions. In the first treatment section a transport screw is arranged for transporting the pulp and impart to it a pressure up to the subsequent treatment section. In this treatment section both the casing and the rotating device are provided with guide elements which cause shearing between the fibre layers of the pulp by alternating velo- city gradiants in the pulp and oscillating movement thereof. In the next treatment section the pulp is imparted a retar- ding velocity in a first part of the section and thereafter an accelerating velocity in a second part of the section du- ring simultaneous oscillating movement and shearing between the fibre layers. This is accomplished by a configuration of both the fixed casing and the rotating device in the form of double-cones having their basis abutting each other.
552068
Frisk Edvin
Frisk Per-Olof
Lindahl Arne
Celleco-Hedemora Aktiebolag
Ridout & Maybee Llp
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