D - Textiles – Paper – 21 – F
Patent
D - Textiles, Paper
21
F
D21F 3/04 (2006.01) D21F 3/02 (2006.01)
Patent
CA 2211497
A pressing section of a papermaking machine is configured to increase pressed dryness significantly while maintaining substantial "one-sidedness", where both sides of the paper sheet have essentially identical surface characteristics. To strike a commercially useful balance between the application of high temperatures and pressures which increase paper dryness but can result in the production of two-sided paper and lowering nip pressure, which enhances one-sidedness but lowers effectiveness in removing water from the paper web, a press section according to the present invention has two conventional presses followed by two or three presses including one heated Extended Nip press. Preferably, smooth high temperature press felts are used to assist in the reduction of two-sidedness of the formed web. The dryer section may, alternatively, add a fifth press utilizing the first dry roll as the backing roll, two Extended Nip presses, a heated Extended Nip press followed by a heated conventional press, or a heated Extended Nip press in the third pressing section, followed by a conventional unheated press utilizing the first dryer as the backing roll.
Beloit Technologies Inc.
Metso Paper Inc.
Mitsubishi Heavy Industries Ltd.
Ridout & Maybee Llp
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