Papermaker's forming fabric with engineered drainage channels
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United States of America Patent
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Aug 28, 2012
Grant Date -
May 5, 2011
app pub date -
Oct 29, 2010
filing date -
Nov 4, 2009
priority date (Note) -
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Abstract
A papermaking forming fabric includes: a set of top MD yarns; a set of top CMD yarns interwoven with the top MD yarns to form a top fabric layer; a set of bottom MD yarns; a set of bottom CMD yarns interwoven with the bottom MD yarns to form a bottom fabric layer; and a set of binding yarns that interweaves with and binds together the top and bottom fabric layers. The fabric has a Channel Factor (CF) of greater than 2.0, the CF being defined in Equation (1) as:
- wherein:PSMW=the CMD width of an interstice between adjacent top MD yarns;PSML=the MD width of an interstice between adjacent top CMD yarns;SOA % PS=surface open area in the top fabric layer; andSOA % RS=surface open area in the bottom fabric layer.
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