Method of multi-nip pressing in a paper machine

Details Method of multi-nip pressing in a paper machine Method of multi-nip pressing in a paper machine

1977-04-25

1980-06-24

Fisher, Richard V.

Paper making and fiber liberation

Processes and products

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

162305, 162360R, D21F 304

Patent

active

042093619

ABSTRACT:
A method in a paper machine press section for dewatering a wet paper web by threading the web in an improved way and avoiding crushing or stretching the web structure through at least three nips of the press section. The invention is particularly characterized by following features of dewatering steps. The web while passing the press section through said three nips is all the time adhered to and supported by the surface of a felt or a roll without any open draws therebetween. Pressing the web in the first dewatering nip takes place between two felts and so the web is dewatered simultaneously through both sides of the web. Further dewatering and pressing steps take place in press nips which all are formed against a plain roll having a large diameter which enables a spacious location of the press rolls and their felts. Detaching the web from the surface of said plain roll for conducting the web into dryer section, takes place in a point allowing easy removal and handling of broke in case of a web break.

REFERENCES:
patent: 2204426 (1940-06-01), Millspaugh
patent: 2686463 (1954-08-01), Hornbostel
patent: 2764068 (1956-09-01), Sutherest
patent: 3268390 (1966-08-01), Ely, Sr.
patent: 3826713 (1974-07-01), Nykopp
patent: 3861996 (1975-01-01), Dorfel
patent: 4075056 (1978-02-01), Ely et al.
patent: 4086131 (1978-04-01), Rempel et al.
Kenneth W. Britt, Handbook of Pulp and Paper Technology, Second Edition, 1970, pp. 419-426.
Albany International Corp., Paper Machine Felts and Fabrics, 1976, pp. 75-78.

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