Polyurethane extended nip press blanket

Details Polyurethane extended nip press blanket Polyurethane extended nip press blanket

1989-07-11

1990-07-31

Hastings, Karen M.

Paper making and fiber liberation

Processes and products

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

162358, 162361, D21F 302

Patent

active

049448447

ABSTRACT:
The present invention relates to a press blanket for pressing water from a formed web which extends through an extended nip defined by an elongate press shoe and a cooperating backing roll. The blanket includes a single layer of fiber reinforced urethane which defines an endless loop. The layer cooperates with the press shoe and extends through the extended nip for pressing the water from the formed web. The single layer has an inner and an outer surface and a first and a second edge zone. The inner surface slidably cooperates with the press shoe and is smooth. The inner surface has a diameter which is reproducible to within a predetermined tolerance range. The outer surface defines a plurality of parallel-spaced circumferential grooves for assisting the drainage of water from the formed web during passage of the web between the outer surface and the backing roll. The edge zones are devoid of grooves such that during use of the blanket, fracturing of the single layer in the vicinity of the grooves disposed adjacent to the edge zones is inhibited.

REFERENCES:
patent: 3557941 (1971-01-01), Thomson
patent: 3630340 (1971-12-01), Bouzat et al.
patent: 4229253 (1980-10-01), Cronin

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