Dual layer papermaking fabric formed in a balanced weave
AssigneeWangner Systems Corporation
InventorScott Quigley
Life of this patent
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Abstract
A wear resistant dual layer papermaking fabric, of stable construction, having a fiber support surface and a machine contact surface. The fabric comprises first picks of weft yarn woven with warp yarns to form weft yarn floats of equal length arranged diagonally over the support surface in a twill pattern. Second picks of weft yarn are woven with the warp yarns to form weft yarns floats of equal length arranged diagonally across the contact surface in a twill pattern. The weave pattern provides that the warp yarns inter-engage with the first and second picks in a balanced weave pattern which maintains the floats parallel.
Claims21
A wear resistant dual layer papermaking fabric having an upper paper fiber support surface and a lower machine contact surface, said fabric comprising:
- a first plurality of picks of weft yarn weaving with a plurality of warp yarns in a twill weave to form, on said support surface, consecutive weft yarn floats of equal length passing over equal members of adjacent of said warp yarns forming said support surface as a weft dominated surface, said warp yarns cross over ends of said weft yarn floats anchoring said weft yarn floats;
- a second plurality of picks of weft yarn weaving with said warp yarns in a twill weave to form on said machine surface consecutive weft yarn floats of equal length passing under even numbers of adjacent of said warp yarns forming said contact surface as a weft dominated surface;
- and,
- providing the number of said support surface weft yarn floats be at least twice the number of said machine surface weft yarn floats.
A papermaking fabric comprising:
- a lower CMD layer having a selected number of yarns per inch;
- an upper CMD layer having a selected number of yarns per inch twice that of said lower CMD layer;
- a system of MD yarns interwoven with said CMD yarn layers in a repeated weave pattern;
- each said MD yarn interweaving to cross under an even number of lower CMD yarns and to cross over an even number of upper CMD yarns, the number of upper CMD yarn cross-overs being twice the number of lower CMD cross-unders per weave pattern repeat, said MD yarn cross-unders and cross-overs being arranged in twill arrays diagonally across said weave pattern;
- wherein,
- opposed surfaces of said fabric are comprised of a plurality of CMD floats arranged in a twill pattern between said spaced MD cross-unders and cross-overs.
Dependencies are inferred from the claim text.