| 摘要 |
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. |
