Pair of opposed co-operating refining elements

Details Pair of opposed co-operating refining elements Pair of opposed co-operating refining elements

2006-03-07

2006-03-07

Banks, Derris H. (Department: 3725)

Solid material comminution or disintegration

Apparatus

Cooperating comminuting surfaces

C241S298000

Reexamination Certificate

active

07007879

ABSTRACT:
Apparatus for refining lignocellulosic material is disclosed having a pair of opposed co-operating refining elements intended for a disk refiner for the disintegration of the lignocellulosic material in a refining gap between two opposed counter-rotating refining disks. The refining elements are intended to be placed directly in front of each other on opposed refining disks, and both refining elements are formed with refining surfaces with bars and grooves. In order to prevent generated steam from flowing rearward in the refining gap, a first refining element is formed with a first radially restricted zone with elevated bars and a second radially restricted zone without bars directly outside the first zone. A second opposed refining element is formed with a third radially restricted zone without bars, which third zone is located directly in front of the first and the second zone on the first refining element.

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patent: 505 395 (1997-08-01), None

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