Single tier dryer section with dual reversing rolls

Details Single tier dryer section with dual reversing rolls Single tier dryer section with dual reversing rolls

1995-01-27

1996-06-04

Kwon, John T.

Drying and gas or vapor contact with solids

Apparatus

Rotary drums or receptacles

34115, F26B 1102

Patent

active

055221513

ABSTRACT:
A paper drying section utilizes two reversing rolls between each dryer roll to extend the available time for vapor to flash from the web. A vacuum box is disposed between the two reversing rolls to support and dry the felt and paper web as it passes from one reversing roll to another. An air cap is used to blow high velocity air onto the exposed surface of the paper web which is held by the vacuum box. The spacing of the two reversing rolls increases the wrap of the single tier dryer by approximately twenty percent over that of a conventional single tier dryer with a single reversing roll. Another configuration dryer section positions the first of the two reversing rolls downwardly beneath its adjacent dryer roll creating a long draw between the dryer roll and the first reversing roll. This long draw is supported by a vacuum box adjacent the felt. The downward positioning of the first roll increases the length of the draw between the first and second reversing rolls, providing additional area for drying by an air cap.

REFERENCES:
patent: 3417925 (1968-12-01), Krikorian
patent: 3733711 (1973-05-01), Haythoenthwaite
patent: 3874997 (1975-04-01), Kankaanpaa
patent: 4743419 (1988-05-01), Biersxhenk
patent: 4744156 (1988-05-01), Futcher
patent: 5084985 (1992-02-01), Ventola
patent: 5269075 (1993-12-01), Brunnmair et al.

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