Papermaking felt with hydrophobic layer
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United States of America Patent
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-
Dec 13, 1994
Grant Date -
N/A
app pub date -
Jun 2, 1993
filing date -
Jun 2, 1993
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A felt for use in a papermaking machine consists of a textile base fabric and a batt layer for supporting the paper web. A flow control layer is interposed between the base layer and the batt layer, to prevent rewetting of the paper web upon the paper web exiting the press nip of the paper making machine. The flow control layer is formed of a porous hydrophobic material. Pressure exerted by the press nip forces water from the paper through the upper batt layer and the flow control layer into the base layer. When such pressure is relieved, the hydrophobicity of the flow control layer prevents backflow of water to the upper batt layer and the paper web, to prevent rewetting of the web. The flow control layer is preferably formed of a spunbonded filamentary nylon material treated with a hydrophobic chemical composition, which maintains its integrity during the needling process in which the batt layer and the base layer are secured together.
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Cited Art Landscape
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