Method and Apparatus for Drying a Moving Web of Material at a Paper or Board Machine
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United States of America Patent
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Issued Date -
May 28, 2009
app pub date -
Jul 20, 2006
filing date -
Jul 20, 2005
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
The invention relates to a method and an apparatus for drying a moving web of material at a paper or board machine. The drying is performed by a heated drying cylinder (1) transverse to the direction of travel of the web, past which the web is being led. According to the invention, the drying cylinder (1) has been constructed so that its temperature can be adjusted independently at different locations in the longitudinal direction of the cylinder, i.e. the transverse direction of the web. With the adjustability of the drying cylinder it is possible to eliminate moisture differences occurring in the transverse direction of the web in connection with the drying. Especially, it is possible to eliminate moisture lines in the longitudinal direction of the web, which are generated when forming the web on the wire. The drying can be done by independently adjustable resistance wires (12) arranged at different locations of the cylinder, by heating vapour supplied independently to different zones of the cylinder, or by using both drying methods simultaneously in the same drying cylinder.
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