Paper making and fiber liberation – Processes and products – Running or indefinite length work forming and/or treating...
Patent
1994-11-22
1997-06-17
Hastings, Karen M.
Paper making and fiber liberation
Processes and products
Running or indefinite length work forming and/or treating...
162206, 1623583, 1623603, D21F 306
Patent
active
056393512
ABSTRACT:
A press section of a paper machine, in particular for printing paper qualities whose grammage is in the range of about 40 g/m.sup.2 to about 80 g/m.sup.2 is disclosed. The press section comprises a pick-up roll having a suction zone on which a paper web is detached at a pick-up point from a forming wire and is passed on the pick-up felt into a first press nip in the press section. In the first press nip, the pick-up felt acts as a press fabric. The press section further includes an extended nip placed after the first press nip. Into this extended nip, the web is passed as a closed draw on support of a fabric face or roll face. The first nip in the press section is a roll nip with relatively low load and acts as a front nip. In the area of the first press nip, almost or approximately one half of the total amount of the water contained in the web entering into the front nip is removed from the web. The extended nip, which is the second press nip in the press section, is formed against a smooth-faced back-up roll. Only one water-receiving press fabric passes through the press zone of the extended nip. The fabric is arranged preferably at the side of the face of the web opposite to the web face placed at the side of the forming wire from which the web is detached at the pick-up point.
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Hastings Karen M.
Valmet Corporation
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