Paper making and fiber liberation – Processes and products – Conditioning – preparing or repairing of apparatus
Patent
1988-01-25
1989-12-26
Hastings, Karen
Paper making and fiber liberation
Processes and products
Conditioning, preparing or repairing of apparatus
34117, 34120, 100 38, 100 93RP, 162206, 162207, 162359, 1623601, D21F 300
Patent
active
048895989
ABSTRACT:
Method and device in a press section of a paper machine for detaching a web from a smooth face of a press roll. Momentary and local heating effect is directed at the web from outside the roll within the area or vicinity of a detaching point thereof. Material is used as the mantle or outer coating of the smooth-face roll which is at least somewhat magnetically conductive. An inductive heating effect is applied to the roll mantle free of contact therewith, and of such a high frequency, that depth of penetration of the heating effect remains sufficiently low in view of the local and momentary nature. Due to this heating effect, water present between the web and roll face is heated, even vaporized locally within the area of the detaching point, thereby detaching the web from the roll face. The electrical frequency of the induction heating is generally within the range of about 0.5 to 2 mHz, preferably within the range of about 0.8 to 1.5 mHz.
REFERENCES:
patent: 3868780 (1975-04-01), Soininente et al.
patent: 4056433 (1977-11-01), Koporen et al.
patent: 4384514 (1983-05-01), Larive et al.
patent: 4551203 (1985-11-01), Eskelinen
patent: 4614565 (1986-09-01), Riihinen
patent: 4653395 (1987-03-01), Verkasala
patent: 4675487 (1987-06-01), Verkasala
Hastings Karen
Valmet Paper Machinery Inc.
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