Paper making and fiber liberation – Processes and products – Running or indefinite length work forming and/or treating...
Patent
1977-09-12
1979-10-30
Fisher, Richard V.
Paper making and fiber liberation
Processes and products
Running or indefinite length work forming and/or treating...
162305, 162306, 162360R, 162364, 162372, 162373, D21F 310
Patent
active
041727592
ABSTRACT:
In a paper-manufacturing machine a web is subjected to suction by placing a space between the web and a suction roll lapped thereby in communication with a region of substantially less than atmospheric pressure which is maintained at a part of the suction roll which is not lapped by the web. The structure includes a jacket which defines with the part of the suction roll which is not lapped by the web a hollow region with which a source of suction communicates. This hollow region of less than atmospheric pressure is situated at the exterior of the suction roll and bounded in part by an exterior surface of the suction roll, so that the hollow interior of the shell of the suction roll need not necessarily be utilized for providing the suction at the web.
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patent: 3718959 (1973-03-01), Sailas
patent: 3826713 (1974-07-01), Nykopp
patent: 3861996 (1975-01-01), Dorfel
Fisher Richard V.
Valmet Oy
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