Paper making and fiber liberation – Processes and products – Running or indefinite length work forming and/or treating...
Patent
1980-01-24
1981-12-22
Fisher, Richard V.
Paper making and fiber liberation
Processes and products
Running or indefinite length work forming and/or treating...
162211, 162217, 162300, 162307, 162314, 162351, 162356, 162373, D21F 120, D21F 140, D21F 150, D21F 200
Patent
active
043069347
ABSTRACT:
The wet end of a fourdrinier paper machine includes a transversely disposed roll beneath the wire. The roll is shaped and mounted for rotation at a speed which is different from the speed of the wire to create pulses of negative pressure beneath the wire for drawing liquid from the web of fibers formed thereon. Also disclosed is a fin apparatus transversely disposed beneath the wire to create a wave of positive pressure thereunder to urge the formed web off of the wire.
REFERENCES:
patent: 1957963 (1934-05-01), Johnstone
patent: 2092798 (1937-09-01), Charlton
patent: 2095378 (1937-10-01), Charlton
patent: 3066068 (1962-11-01), Calehuff et al.
patent: 3357881 (1967-12-01), Bennett
patent: 3595746 (1971-07-01), Little
patent: 3746613 (1973-07-01), Vauhkonen
patent: 3874998 (1975-04-01), Johnson
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