Extended nip press with heating effects avoidance

Details Extended nip press with heating effects avoidance Extended nip press with heating effects avoidance

1985-03-28

1987-02-17

Bashore, S. Leon

Paper making and fiber liberation

Apparatus

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

100153, 162205, 162361, D21F 302

Patent

active

046438025

ABSTRACT:
An extended nip press for removal of water from a web of fibers experiences a press shoe expansion and deformation problem due to uneven heating of the press shoe under load. The press nip includes a rotatable press roll, which is opposed to a press shell or jacket that rides over a press shoe that is supported in a recess on a supporting member. The press shoe has an upper part with a top surface on which the press belt slides through the press nip and has a lower supporting part. The upper and lower parts are heat insulated by an inserted insulating layer. The upper and lower parts are form locked by a spline connection toward the inlet side of the press nip. To avoid heat-caused deformation of the press shoe, the lower supporting part has a greater moment of resistance against flexure than the upper part due to their respective cross-sections. Further, the upper part of the press shoe, at its slide path, in the unloaded condition is deviated in shape in a direction opposite to the direction in which the press shoe deforms upon heating, so that upon heating, the press shoe will assume a normal desired shape.

REFERENCES:
patent: 3726338 (1973-04-01), Sorenson
patent: 4064607 (1977-12-01), Wolf
patent: 4287021 (1981-09-01), Justus et al.
patent: 4296537 (1981-10-01), Kusters et al.

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