D - Textiles – Paper – 21 – D
Patent
D - Textiles, Paper
21
D
92/34
D21D 1/00 (2006.01) D21D 1/20 (2006.01) D21D 1/30 (2006.01)
Patent
CA 2037045
A multi-stage process, and apparatus for carrying out the process, are provided for refining lignocellulose containing material at high consistency. The lignocellulose material is pretreated to form a mixture (11) of the lignocellulose material andpressurized steam conveyed via the pressure of the pressurized steam to a first refining means (10), wherein the lignocellulose material is conveyed mechanically into a first refining zone within the first refining means (10) while causing the pressurized steam in the mixture (11) to pass in reverse direction to the lignocellulose to a steam venting outlet to vent the steam from the first refining means 10. The lignocellulose material fed into the first refining zone is subjected to refining action thereby producing a mixture (13) of partially refined lignocellulose material and pressurized steam developed during the refining action. This mixture (13) of partially refined lignocellulose material and pressurized steam is conveyed via the pressure of the pressurized steam to a second refining means (110), wherein the partially refined lignocellulose material in the mixture is conveyed mechanically into a second refining zone in said second refining (110) means while causing the pressurized steam in said mixture (13) to pass in reverse direction to the lignocellulose material to a steam venting outlet to vent the steam from the second refining means (110). The lignocellulose material fed into the second refining zone is subjected to refining action thereby producing a mixture (113) of further refined lignocellulose material and steam developed during said refining action. The further refined lignocellulose material is discharged from the second refining means and separated from the steam developedduring the refining action in the second refiner means and recovered as further refined lignocellulose material.
Allshouse Gary Wayne
Backhus Heinz Otto
Fisher Chester Donald
Kohler Gregory Raymond
Lahner William Fredrick III
Andritz Sprout-Bauer Inc.
Smart & Biggar
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