Paper making and fiber liberation – Processes and products – Conditioning – preparing or repairing of apparatus
Patent
1977-11-21
1980-03-11
Fisher, Richard V.
Paper making and fiber liberation
Processes and products
Conditioning, preparing or repairing of apparatus
162206, 162272, 162305, 162359, 162360R, D21F 302, D21F 304
Patent
active
041927117
ABSTRACT:
A paper-manufacturing machine and method include the feature of detaching a web from a forming wire by utilizing a stationary transfer suction box past which a felt travels while contacting the web so that the latter becomes detached from the forming wire and adheres to the felt while travelling with the latter beyond the forming wire. The felt and web are lapped through a substantial angle around a roll having a recessed surface whiletravelling toward the first press nip of a press section, and at this roll around which the felt and web are lapped a means is provided for directing steam toward the web and through the latter and the felt inwardly toward the recessed surface of the guide roll so that the flowing steam will on the one hand heat water carried by the web to enhance dewatering of the web at the first press nip while on the other hand the steam will serve to maintain the web reliably in engagement with the felt as the latter travels toward the first press nip. Beyond the first press nip the web may be subjected to one or more additional press nips and, if desired, to the smoothing action of a smooth-surfaced roll which presses the web against a central smooth-surfaced roll of the press section, before the web is guided away from the central press roll to a drying section.
REFERENCES:
patent: 3309263 (1967-03-01), Grobe
patent: 3441476 (1969-04-01), Schiel
patent: 3560333 (1971-02-01), Douglas et al.
patent: 4016032 (1977-04-01), Kankaanpaa
patent: 4056433 (1977-11-01), Koponen et al.
patent: 4075056 (1978-02-01), Ely et al.
Hannonen Eero
Tapio Olli
Veijonen Lassi
Fisher Richard V.
Valmetoy
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