Method for heating a roll and a heatable roll

Details Method for heating a roll and a heatable roll Method for heating a roll and a heatable roll

1993-02-24

1995-04-11

Rivell, John

Heat exchange

Movable heating or cooling surface

Rotary drum

165135, 165146, F28F 502, F28F 1314

Patent

active

054049369

ABSTRACT:
The invention relates to a method for heating a roll and a heatable roll for use in a paper machine, paper finishing machine, or equivalent. The roll is heated by a heating medium which is introduced into the roll interior through at least one of the ends of the roll. The heating medium acts upon the material of the roll mantle or the roll and is arranged to flow across the axial length of the roll. The heating medium is arranged to flow out of the roll through either one of the ends of the roll. The roll is provided with means by which the coefficient of heat transfer from the flowing heating medium to the material of the roll is increased in the flow direction of the heating medium.

REFERENCES:
patent: 1837562 (1931-12-01), Mayer
patent: 2420373 (1947-05-01), Hogberg
patent: 2661546 (1953-12-01), Petry et al.
patent: 2875985 (1959-03-01), Hold
patent: 4074750 (1978-02-01), Beghin
patent: 4077466 (1978-03-01), Fleissner
patent: 4183298 (1980-01-01), Cappel et al.
patent: 4405440 (1983-09-01), Gwyn
patent: 4470709 (1984-09-01), Koehler et al.
patent: 4498383 (1985-02-01), Pav et al.
patent: 4658486 (1987-04-01), Schonemann
patent: 4794984 (1989-01-01), Lin
patent: 4875297 (1989-10-01), Zaoralek
patent: 4913224 (1990-04-01), Moran
Antti Arjas, Paper Making Part 2, Turku 1983, Jukka Joutsjoki-Hannu Malkia Paper Glazing Chilled Rolls, pp. 1199, 1206.

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