Two-stage variable intensity refiner

Details Two-stage variable intensity refiner Two-stage variable intensity refiner

D - Textiles, Paper

21

D

D21D 1/20 (2006.01) D21D 1/30 (2006.01)

Patent

CA 2094674

TWO-STAGE VARIABLE INTENSITY REFINER Abstract of the Disclosure A high consistency pulp refiner of the type having a pressurized casing (12) containing opposed grinding discs (14,18) mounted for counter-rotation about a common axis (26) and between which material to be refined is introduced near the axis 80 as to move generally radially outwardly through an inner refining zone (40) between the discs while producing steam as a result of the refining action. The partially refined material and steam then move through a generally radially outer refining zone (50) between one of the discs (14) and a stationary grinding surface (54) situated generally radially outwardly of the other disc (18), whereupon the refined material and steam are discharged from the casing through a material outlet (62). A generally axially extending flow path (64) originates between the first refining zone (40) and the second refining zone (50), for diverting steam produced in the first refining zone away from the second refining zone while the partially refined material moves from the first refining zone to the second refining zone.

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