Press section with an equalizing nip in a paper machine

Details Press section with an equalizing nip in a paper machine Press section with an equalizing nip in a paper machine

1997-06-13

1998-12-15

Hastings, Karen M.

Paper making and fiber liberation

Processes and products

Running or indefinite length work forming and/or treating...

1623583, 1623603, 1623591, D21F 300

Patent

active

058491562

ABSTRACT:
A press section of a paper machine through which a paper web has a substantially closed and supported draw including an extended-nip zone and an equalizing-nip zone following the extended-nip zone in the running direction of the web. In the equalizing-nip zone, the asymmetry of roughness is equalized that was formed in the web to be pressed in the preceding press nip or nips, while not dewatering the web to a substantial extent. The extended-nip zone and the equalizing-nip zone are formed between three press components which are interconnected in a compact way so that the extended nip is formed by a press component provided with a flexible mantle together with a press roll provided with a rigid mantle. The press roll with the rigid mantle also forms the equalizing-nip zone together with a smooth-faced equalizing-press roll. After the equalizing-nip zone, the web has at least one free draw or runs on a transfer fabric, on which draw(s) or run, by a difference in speed, the stretch of the web in the machine direction, taking place in the equalizing-press nip is compensated for and the web is kept appropriately tensioned.

REFERENCES:
patent: 4483745 (1984-11-01), Wicks et al.
patent: 4566946 (1986-01-01), Koponen et al.
patent: 4943351 (1990-07-01), Wedel
patent: 5389205 (1995-02-01), Pajula et al.
patent: 5545295 (1996-08-01), Fujita et al.

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