Patent ID: 7445032

Claim:
A multilayered papermakers' forming fabric woven to a first repeating pattern, having a paper side layer with a paper side surface and a machine side layer having a machine side surface, and comprising (i) at least a first set of paper side layer warp yarns; (ii) a second set of machine side layer warp yarns; (iii) at least a first set of cross-machine direction (CD) machine side layer weft yarns; and (iv) paper side layer weft yarns woven in a second repeating pattern with at least some of the paper side layer warp yarns, and comprising (a) primary weft yarns which do not contribute to the machine side surface; and (b) pairs of intrinsic weft binder yarns; wherein (1) at least some of the paper side layer weft yarns comprise an array of bulk enhancing weft yarns each having a vertical dimension measured in a direction substantially perpendicular to the paper side surface of the fabric which exceeds a corresponding vertical dimension of each of the remaining paper side layer weft yarns in a ratio of at least 1.5:1; and (2) the array of bulk enhancing weft yarns is selected from at least one of the group comprising primary weft yarns, intrinsic weft binder yarns, and a combination of primary weft yarns and intrinsic weft binder yarns.