Paper making and fiber liberation – Processes and products – Running or indefinite length work forming and/or treating...
Patent
1977-02-23
1980-02-12
Fisher, Richard V.
Paper making and fiber liberation
Processes and products
Running or indefinite length work forming and/or treating...
162305, 162306, 162307, 162360R, D21F 200, D21F 304
Patent
active
041882628
ABSTRACT:
A method for feeding a paper web from a forming wire and for dewatering the web including the steps of urging a pick-up felt against the web on the forming wire, adhering the web by suction to the surface of a pick-up felt, transferring the web onto a transfer felt which wraps a transfer roll, the latter being contiguous to the pick-up roll, passing the web on the transfer felt to a first dewatering press nip formed by an upper suction press roll and a cavernous surface lower press roll, the latter operating inside the transfer felt loop while the suction roll operates inside its own felt loop, pressing the web in the first press nip to dewater the web in two directions i.e. towards the suction roll and towards the cavernous surface roll, adhering the web to the suction roll felt surface, transferring the web to a second dewatering press nip formed by the suction roll and by a smooth surface press roll, pressing the web in the second nip to dewater the web only towards the suction roll, detaching the web from the suction roll felt and adhering the same to the surface of the smooth surface press roll and transferring the web to a following web treatment phase.
REFERENCES:
patent: 2653523 (1953-09-01), Hornbostel
patent: 2694346 (1954-11-01), Goodwillie
patent: 3595745 (1971-07-01), Cronin
patent: 3861996 (1975-01-01), Dorfel
patent: 4075056 (1978-02-01), Ely et al.
patent: 4086131 (1978-04-01), Rempel et al.
Albany International Corp., Paper Machine Felts and Fabrics, 1976, pp. 65-67.
John F. Atkins (Editor), Paper Machine Wet Press Manual, Tappi Monogram Series No. 34, 1972, pp. 42-44.
J. Newell Stephenson (Editor-in Chief), Pulp and Paper Manufacture: Manufacturing and Testing of Paper and Board, 1953, vol. 3, p. 511.
Fisher Richard V.
Valmet
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