Paper machine felts
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United States of America Patent
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Jul 21, 1998
Grant Date -
N/A
app pub date -
Aug 14, 1995
filing date -
Dec 16, 1993
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The invention relates to postcondensed paper machine felts comprising a polyamide base fabric and a polyamide coating needled thereon, the paper machine felts having a relative solution viscosity in sulfuric acid in accordance with the DIN 53,727 standard of 5 or more. The invention further relates to a method of increasing the molecular weight of paper machine felts which comprises impregnating the paper machine felts with a solution of postcondensation catalysts, followed by drying and thermally postcondensing the felts below the melting point of the polyamide in a solid phase by the exclusion of oxygen.
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