Patent ID: 8444826
Filing Date: 2013-05-21
Classification: D21F

Abstract:
1. A flat woven industrial filtration fabric, having a paper side layer with a paper side surface and a machine side layer with a machine side surface, the fabric being woven according to a first repeating weave pattern and comprising: (a) paper side layer weft yarns; (b) machine side layer weft yarns; (c) intermediate weft yarns located between the paper side layer and the machine side layer; (d) first warp yarns; and (e) second warp yarns, wherein: (i) the first warp yarns all comprise groups of at least two members and are interwoven with the paper side layer weft yarns and the intermediate weft yarns according to a second repeating weave pattern wherein the members of each group together form a single combined path on the paper side surface of the fabric; (ii) the second warp yarns all comprise groups of at least two members and are interwoven with the machine side layer weft yarns and the intermediate weft yarns according to a third repeating weave pattern wherein the members of each group together form a single combined path on the machine side surface of the fabric; and (iii) at each location at which a first warp yarn interweaves with an intermediate weft yarn, a second warp yarn interweaves with the same intermediate weft yarn, and (iv) at each location at which a second warp yarn interweaves with an intermediate weft yarn, a first warp yarn interweaves with the same intermediate weft yarn.