Method and arrangement for preventing vibrations in a...

Details Method and arrangement for preventing vibrations in a... Method and arrangement for preventing vibrations in a...

2007-12-25

2007-12-25

Nguyen, Jimmy T. (Department: 3725)

Presses

Methods

C100S047000, C100S161000, C100S164000, C100S16300R

Reexamination Certificate

active

10543525

ABSTRACT:
Vibration is prevented in a multi-nip calender (1) or an array of multi-nip calendars. Each calender has a lower roll (3; 40), an upper roll (3; 30) and two or more intermediate rolls. A fiber web is conveyed through the closed roll nips of the calenders. The intermediate rolls (3) have load-relieving apparatus and the upper roll (3; 30) and the lower roll (3; 40) have loading apparatus, while loading apparatus are connected to the lower roll (3; 40) and/or the upper roll (3; 30) for loading these rolls from the outside in a direction parallel with the calender plane. The running parameters (9) influencing the calendering impulse of one or more selected roll nips (N) are intermittently or continuously changed, such that the overall calendering impulse (9) of the calender or calender array and/or the quality variables (21) of the fiber web remain substantially constant and/or within predetermined limits.

REFERENCES:
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patent: 5961899 (1999-10-01), Rossetti et al.
patent: 6615709 (2003-09-01), Suomi et al.
patent: 6857356 (2005-02-01), van Haag et al.
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patent: 0 779 394 (1997-06-01), None
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patent: WO 2005/052254 (2005-06-01), None
International Search Report issued in PCT/FI2004/000720.
Search Report issued in Finnish Patent Application 20031735.
International Preliminary Report on Patentability issued in PCT/FI2004/000720.

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