Patent ID: 6989079
Filing Date: 2006-01-24
Classification: D21F,Y10S,Y10T

Abstract:
1. A double layer forming fabric for a paper making machine, woven to an overall repeating pattern having a machine direction (MD) and a cross-machine direction (CD), which fabric comprises in combination: (a) paper side (PS) layer weft yarns oriented in the CD; (b) machine side (MS) layer weft yarns oriented in the CD; and (c) machine direction (MD) oriented warp yarns, wherein (i) the PS layer weft yarns interweave with the warp yarns in a first repeating weave pattern; (ii) the MS layer weft yarns interlace with the warp yarns in a second repeating weave pattern; (iii) the overall repeating pattern requires 3N sheds, in which N is an integer and is at least 2; (iv) for each repeat of the overall repeating weave pattern, each warp yarn forms two interweaving locations in the paper side layer alternated with two interlacing points in the machine side layer, such that (A) each interweaving location comprises a first and a second interweaving point separated by at least two paper side layer weft yarns; (B) each interlacing point is located substantially centrally in relation to each adjacent interweaving point on the same warp yarn and separated therefrom by at least two MS weft yarns; (C) each interweaving location is separated in the CD from each adjacent interweaving location by one warp yarn; and (D) for any group of three adjacent warp yams, one interlacing point for each of the first and third warp yarns is with a common MS layer weft yarn substantially below an interweaving location of the second warp yarn; and (v) a MS surface of the MS layer includes exposed MS layer weft yarn floats having a float length L defined as L=3N−M, wherein M is an integer and is at least 1.