Drying and gas or vapor contact with solids – Process – Gas or vapor contact with treated material
Patent
1997-06-09
2000-04-18
Bennett, Henry
Drying and gas or vapor contact with solids
Process
Gas or vapor contact with treated material
34117, D21F 500
Patent
active
060499990
ABSTRACT:
A papermaking machine including a forming section for forming a paper web, a press section for pressing water from the paper web, and a dryer for drying the paper web is disclosed. The dryer includes a wet end for drying the paper web to at least about 60 percent solids and a dry end for further drying the paper web. The dry end includes at least one series of alternating dryer cylinders and vacuum rolls. A dryer felt transports the paper web as the dryer felt travels about each dryer cylinder and each vacuum roll of the series. In one disclosed embodiment, at least one of the vacuum rolls receives a vacuum of at least about one inch water column (1.5 kilo-pascals, "kPa") to restrain the web as it dries. A method for manufacturing a paper web while restraining it by using the dryer apparatus described above is also disclosed. Drying the paper web under restraint in the dry end of the dryer can substantially reduce cross-machine direction shrinkage and stretch of the web, reduce edge curl, and have other substantial benefits.
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Skaugen Borgeir
Wedel Gregory L.
Beloit Technologies Inc.
Bennett Henry
Gravini Steve
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