Method and assembly for opening calender nips

Details Method and assembly for opening calender nips Method and assembly for opening calender nips

2005-01-11

2005-01-11

Ostrager, Allen (Department: 3725)

Presses

Methods

C100S039000, C100S047000, C100S095000, C100S168000, C700S127000, C702S138000, C162S205000

Reexamination Certificate

active

06840165

ABSTRACT:
The present invention relates to a method and assembly for opening the nips (9,10) of a calendar comprising at least two elements (1, 2; 3, 4) brought to a nip contact with each other, especially for performing the nip opening at a break or damage occurring in the web (5) being calendered. The tension of the web (5) being calendered is measured at multiple points over the cross-machine width of the web (5) and the calender nips (9,10) are opened when the measured web tension at a preset number of points over the cross-machine width of the web (5) has fallen to a limit value that by a decision-making algorithm monitoring the tension profile of the web (5) is interpreted to indicate a web break situation or other damage on the web (5) requiring opening the nips (9,10).

REFERENCES:
patent: 4283821 (1981-08-01), Paakkunatinen
patent: 4485734 (1984-12-01), Klemmer et al.
patent: 4799997 (1989-01-01), Thompson
patent: 5052233 (1991-10-01), Rantala
patent: 6293175 (2001-09-01), Enwald et al.
patent: 299 02 451 (1999-07-01), None
patent: 0 321 561 (1989-06-01), None
patent: 1 011 114 (1965-11-01), None

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