Screen cylinder

Paper making and fiber liberation – Apparatus – Slurry supply conditioning or condition maintaining

Reexamination Certificate

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Details

C209S397000, C209S305000, C210S498000, C210S414000

Reexamination Certificate

active

07820013

ABSTRACT:
A screen cylinder comprising screen slots (3) and accept channels (8) for directing the portion penetrated the screen slots (3) to an accept side (9) of the screen cylinder (1) of the fiber pulp suspension fed into a feed side (10) of the screen cylinder (1). At least one feed side surface (4) is provided between the screen slots (3) and the accept channels (8) comprise at least one first surface (5) of the accept channel (8) and at least one second surface (6). At least a third of the total length of the accept channel (8) is arranged in a direction opposite to a feed flow direction (A) of the fiber pulp suspension in relation to a normal (19) of a tangent (18) of the screen cylinder (1), which is arranged to pass through the screen slot (3).

REFERENCES:
patent: 5587077 (1996-12-01), Aaltonen et al.
patent: 6273266 (2001-08-01), Schabel
patent: 91 08 129 (1991-09-01), None
patent: 19609316 (1997-09-01), None

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