Paper making and fiber liberation – Processes and products – Running or indefinite length work forming and/or treating...
Patent
1995-11-08
1997-09-09
Hastings, Karen M.
Paper making and fiber liberation
Processes and products
Running or indefinite length work forming and/or treating...
162306, 1623591, 1623603, D21F 302
Patent
active
056652062
ABSTRACT:
Method and device in the press section of a paper machine for detaching a web from a smooth mantle face of a press roll. In the method and device, a transfer zone is employed, over which a press fabric or a particular transfer fabric is passed so as to accomplish a closed draw of the web. The transfer zone as well as the fabric form a transfer nip or a transfer zone with the roll face. At the transfer point, the temperature level of the roll face and/or of the web is set or regulated so high that the pressure of saturated vapor of the water present in connection with the web and with the roll face which corresponds to the temperature level is substantially equally high as, or just little higher than, the pressure that has been set to prevail in the transfer zone, the pressure being preferably lower than the atmospheric pressure.
REFERENCES:
patent: 4016032 (1977-04-01), Kankaanpaa
patent: 4889598 (1989-12-01), Niskanen
patent: 4919759 (1990-04-01), Ilmarinen et al.
patent: 4948466 (1990-08-01), Jaakkola
patent: 5232555 (1993-08-01), Daunais et al.
Hastings Karen M.
Valmet Corporation
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