Drying and gas or vapor contact with solids – Apparatus – Rotary drums or receptacles
Patent
1991-12-13
1995-05-23
Gromada, Denise L.
Drying and gas or vapor contact with solids
Apparatus
Rotary drums or receptacles
34116, 34120, F26B 1102
Patent
active
054169801
ABSTRACT:
The invention is related to a method and a device in the drying section of a paper machine for reducing the tendency of the paper to curl. The paper web is dried on drying cylinders, against whose heated faces the paper web is pressed by means of a drying wire. In the drying section, groups of drying cylinders are used, in which twin-wire draw and/or single-wire draw is/are applied. In the drying section, hot water steam is fed substantially onto the entire width of the paper web, by means of which steam tensions that have been formed or that tend to be formed in the fiber mesh in the paper web are relaxed by means of heat and moisture in the area of their formation or substantially immediately thereafter. Moreover, the transverse curling profile and/or moisture profile of the paper web can be controlled by the steam treatment.
REFERENCES:
patent: 2091805 (1937-08-01), Chose
patent: 4249992 (1981-02-01), Wells
patent: 4378639 (1983-04-01), Walker
patent: 4662398 (1987-05-01), Wywailowski et al.
patent: 4876803 (1989-10-01), Wedel
patent: 5175945 (1993-01-01), Skaugen et al.
Gromada Denise L.
Valmet Paper Machinery Inc.
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