Press section including an extended-nip press with an internally

Details Press section including an extended-nip press with an internally Press section including an extended-nip press with an internally

1996-10-16

1998-09-22

Hastings, Karen M.

Paper making and fiber liberation

Apparatus

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

162206, 1623591, 492 46, D21F 304

Patent

active

058109749

ABSTRACT:
A press section in a paper machine including a compact combination of rolls which form a number of press nips with one another in which water is removed from a paper web. The paper web has a closed draw supported by a press fabric or by a roll face at least between the nips. The press section includes a center roll in connection with which at least two press nips are formed. The last press nip placed in connection with the center roll is an extended nip. The center roll is a roll provided with a circulation system for a heating medium and a heatable outer mantle. An outer face of the mantle of the center roll is heated by means of the circulation of the heating medium to such a temperature level that the dewatering of the paper web in the press nips arranged in connection with the center roll, in particular in the extended nip, is intensified substantially. The invention can also be accomplished in an environment in which there are two or more separate press nips, of which press nips, at least the last press nip is an extended nip.

REFERENCES:
patent: 4459726 (1984-07-01), O'Brien et al.
patent: 4561939 (1985-12-01), Justus
patent: 4568423 (1986-02-01), Laapotti
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patent: 5522959 (1996-06-01), Illmarinen
Abstract of Finnish Patent Appln. No. 925634, Dec. 11, 1992, "Heatable Roll, In Particular A Press Roll Of A Paper Machine".
Abstract of Finnish Patent Appln. No. 930439, 1993, "Method For Heating A Roll, In Particular A Press Roll Of A Paper Board Machine".
Abstract of Finnish Patent Application No. 882312, 1988, "Method in the Press Treatment of a Fibrous Web".
Abstract of Finnish Patent Application No. 903916, Aug. 8, 1990, "Heatable Roll".
Abstract of Finnish Patent Application No. 901633, 1990, Variable-Crown Roll.
"Zum Einsatz von Schuhpressen bei Schreib-und Druckpapieren", A. Meinecke and K. Steiner, Wochenblatt fur Papierfabrikation, vol. 5, 1988.

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