Method for calendering a fibrous web and a calender

Paper making and fiber liberation – Apparatus – Running or indefinite length product forming and/or treating...

Reexamination Certificate

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Details

C100S161000, C100S047000, C100S331000, C100S167000

Reexamination Certificate

active

07413632

ABSTRACT:
A calender includes at least two roll stacks which each have at least three rolls, and in each of which the web path of a fibrous web meanders between each roll pair of the stack. In order to produce a selectable fibrous web grade, the web is passed between each roll pair of each stack, so that at least one roll pair in at least one stack is in nip contact to form a nip that calenders the web. The web runs between each roll pair of each roll stack and, in order to produce a selectable fibrous web grade, a selectable number of rolls is in nip contact with each other in each stack to form at least one nip that calenders the fibrous web.

REFERENCES:
patent: 4497246 (1985-02-01), Pav et al.
patent: 5669295 (1997-09-01), Kayser et al.
patent: 5673617 (1997-10-01), Linder
patent: 6248215 (2001-06-01), Cramer et al.
patent: 0 890 676 (1999-01-01), None
patent: 69150 (1996-02-01), None
patent: 102552 (1998-12-01), None
patent: 00732447 (1998-12-01), None
patent: WO 01/23666 (2001-04-01), None
patent: WO 01/63047 (2001-08-01), None
patent: WO 2004/061221 (2004-07-01), None
Search Report issued in Finnish Application No. 20030003.
International Search Report issued in PCT/FI03/00961.
International Preliminary Examination Report issued in PCT/FI03/00961.

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