Vacuum apparatus having flow management device 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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Feb 17, 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 has a flow management device facing said web-contacting surface of the papermaking belt and disposed such that the papermaking belt having the paper web thereupon travels between the flow management device and the web-facing surface of the head. The flow management device has an air flow resistance and controls the distribution of the air flow through the aperture on the web-facing surface such as to effectively increase in the machine direction the amount of vacuum pressure applied through the vacuum slot to the papermaking belt.
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