Papermaker's Forming Fabric with Engineered Drainage Channels

摘要

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:; CF=(PSMW/PSML)×(SOA % PS/SOA % RS)  (1)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.