Patent ID: 7493923
Filing Date: 2009-02-24
Classification: D21F

Abstract:
1. A double layer papermakers' fabric, comprising a system of warp yarns and first, second and third systems of weft yarns, interwoven according to an asymmetric weave pattern to provide a planar paper side surface, a planar machine side surface and a center plane located intermediate of the planar paper and machine side surfaces, such that: a. the first system of weft yarns is interwoven with the system of warp yarns to provide the paper side surface of the fabric; b. the second system of weft yarns is interwoven with the system of warp yarns to provide the machine side surface of the fabric; c. the third system of weft yarns is interwoven with the system of warp yarns to provide the center plane of the fabric; d. the system of warp yarns is interwoven with the first, second and third weft yarn systems according to an asymmetric weave pattern such that it passes from the paper to the machine side surface of the fabric in each repeat of the overall fabric weave pattern, wherein: (i) the first system of weft yarns is interwoven with the system of warp yarns so as to form pockets on the paper side surface; (ii) the second system of weft yarns is interwoven with the system of warp yarns so as to form pockets on the machine side surface; (iii) a weft yarn from the third system of weft yarns is located at the bottom of each pocket; and (iv) the number of pockets on the PS surface ranges from 50 to 750 pockets per sq. in. (8 to 116 pockets per sq cm).