Vacuum apparatus having plurality of vacuum sections for controlling the rate of application of vacuum pressure in a through air drying papermaking process
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United States of America Patent
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Apr 21, 1998
Grant Date -
N/A
app pub date -
Sep 3, 1996
filing date -
Sep 3, 1996
priority date (Note) -
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Abstract
A papermaking vacuum apparatus having a web-facing surface adapted to support a papermaking belt and comprising a head, a body and at least one vacuum slot disposed in the head and defining an aperture on the web-facing surface. The vacuum slot is in fluid communication with the web-facing surface and extends from the web-facing surface to the body which is in further fluid communication with a vacuum source. The vacuum apparatus comprises a plurality of sequenced vacuum sections successively spaced in the machine direction from a first vacuum section to a last vacuum section. Each vacuum section comprises at least one vacuum slot in fluid communication with the web-facing surface and defining an aperture thereon. Each vacuum section has a vacuum applied therethrough, this vacuum increasing in the machine direction between successive vacuum sections.
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