Papermaker'S fabric to develop caliper and topography in paper products
View Patent ↗A papermaker's fabric including at least one system of warp yarns interwoven with at least first and second systems of weft yarns, with the weft yarns of the first system of weft yarns having a vertical dimension that is greater than a vertical dimension of the weft yarns of the second system. The fabric has a papermaking surface and a machine side surface, and in the papermaking surface, the yarns of the first system of weft yarns are interwoven with the warp yarns to provide groups of four weft yarn floats which form four corners of a box shape, the yarns of the second system of weft yarns are interwoven with the warp yarns so as to pass through the bottom of the box shape, and further provide support areas in pockets located adjacent to the box shapes, and at least one yarn from the second system of weft yarns interweaves with the warp yarns to occupy space in a center plane of the fabric so as to restrict or retard drainage and thereby increase a center plane resistance of the fabric.
1. A papermaker's fabric comprising at least one system of warp yarns interwoven with at least first and second systems of weft yarns, the weft yarns of the first system of weft yarns having a vertical dimension that is greater than a vertical dimension of the weft yarns of the second system, the fabric having a papermaking surface and a machine side surface, wherein in the papermaking surface:
a) the yarns of the first system of weft yarns are interwoven with the warp yarns to provide groups of four weft yarn floats which form four corners of a box shape on the papermaking surface;
b) the yarns of the second system of weft yarns are interwoven with the warp yarns so as to pass through the bottom of the box shape, and further provide support areas in pockets located adjacent to the box shapes;
c) at least one yarn from the second system of weft yarns interweaves with the warp yarns to occupy space in a center plane of the fabric so as to restrict or retard drainage and thereby increase a center plane resistance of the fabric.
2. A fabric according to claim 1 , wherein the fabric is one of a composite SSB fabric, a warp tie fabric, a double layer extra support fabric, a double layer fabric, a semi duplex or a single layer fabric.
3. A fabric according to claim 1 , wherein the fabric is a warp tie fabric.
4. A fabric according to claim 1 , wherein a number of warp yarns between each knuckle ranges from 1 to 4.
5. A fabric according to claim 1 , wherein a number of the pocket yarns between each of the yarns of the first system of weft yarns is from 1 to 6.
6. A fabric according to claim 1 , wherein a number of the yarns of the second weft system located between the weft yarn floats of adjacent non-paired ones of the first system of weft yarns is different from a number of the yarns of the second weft system located between pairs of adjacent ones of the weft yarns of the first system of weft yarns that form the box shape.
7. A fabric according to claim 1 , wherein the fabric comprises a forming fabric.
8. A fabric according to claim 1 , wherein the fabric comprises a TAD fabric.
9. A fabric according to claim 1 , wherein the vertical dimension of the yarns of the first system of weft yarns is at least 1.25 times greater than the vertical dimension of the yarns of the second system of weft yarns.
10. A fabric according to claim 1 , wherein the weft yarns of the first system of weft yarns are arranged in adjacent pairs that are separated from one another by the yarns from the second system weft yarns, and the pairs of first system weft yarns are interwoven with the warp yarns on a paper support side of the fabric so that aligned pairs of the weft yarn floats which form the four corners of the box shape are formed over the same warp yarns.
11. A fabric according to claim 1 , wherein the at least one system of warp yarns comprises first and second systems of warp yarns, the first system of warp yarns interweaves with the first system of weft yarns on a paper support side of the fabric, the second system of weft yarns only interweaves with the first system of warp yarns on the paper side surface of the fabric, and the second system of warp yarns is located on a machine side surface of the fabric, and the weft yarns of the first system of weft yarns interweave with the second system of warp yarns.
12. A fabric according to claim 11 , further comprising a third system of weft yarns that only interweaves with the second system of warp yarns.