Woven multilayer papermaking fabric having increased stability and permeability
First Claim
1. A woven papermaking fabric for formation of a paper sheet in a papermaking machine about which the papermaking fabric travels, said papermaking fabric having machine direction yarns which correspond to the longitudinal direction of the papermaking fabric as it travels on the papermaking machine, the woven fabric has a paper forming side and a roller contact side and is comprised of:
- a first system of longitudinal, monofilament machine direction yarns that predominate on the paper forming side of said fabric;
a second system of longitudinal, monofilament machine direction yarns that predominate on the roller contact side of said fabric;
the yarns of the first and second systems are arranged in vertically stacked pairs of first and second machine direction yarns position one above the other in a superimposed relationship; and
a system of cross machine direction yarns interwoven with the yarns of the machine direction systems in a repeat pattern that maintains the stacked relationship of the paired yarns such that the yarns of the first system do not pass to the roller contact side and the yarns of the second system do not pass to the paper forming side.
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Abstract
A papermaking fabric for use with papermaker machines having a system of shaped monofilament machine direction, yarns hereinafter MD yarns, which are woven in stacked, vertical alignment throughout the body of the fabric. Preferably, each upper MD yarn defines floats on the upper surface of the fabric and is vertically stacked with respect to the lower MD yarns. The upper and lower MD yarns may be of the same type and size or they may differ in size, shape, and composition.
136 Citations
15 Claims
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1. A woven papermaking fabric for formation of a paper sheet in a papermaking machine about which the papermaking fabric travels, said papermaking fabric having machine direction yarns which correspond to the longitudinal direction of the papermaking fabric as it travels on the papermaking machine, the woven fabric has a paper forming side and a roller contact side and is comprised of:
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a first system of longitudinal, monofilament machine direction yarns that predominate on the paper forming side of said fabric; a second system of longitudinal, monofilament machine direction yarns that predominate on the roller contact side of said fabric; the yarns of the first and second systems are arranged in vertically stacked pairs of first and second machine direction yarns position one above the other in a superimposed relationship; and a system of cross machine direction yarns interwoven with the yarns of the machine direction systems in a repeat pattern that maintains the stacked relationship of the paired yarns such that the yarns of the first system do not pass to the roller contact side and the yarns of the second system do not pass to the paper forming side. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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- 9. A papermaking fabric having a single layer of CMD yarns and a system of flat monofilament MD yarns interwoven with said CMD yarns in a selected repeat pattern, wherein the MD yarn system is comprised of paired upper and lower yarns stacked in the same relative vertical alignment to each other throughout the body of the fabric and wherein the combination of the weave repeat, yarn size and shape, and material composition of the upper MD yarns differs from the combination of the weave repeat, yarn size and shape and material composition of the lower MD yarns such that the upper MD yarns and the lower MD yarns impart different surface characteristics to the opposing sides of the fabric by dominating both of the opposing sides.
Specification