Patent ID: 8147653
Filing Date: 2012-04-03
Classification: D21F

Abstract:
1. An industrial woven fabric for filtration in formation of a fibrous cellulosic sheet, the fabric having a sheet side layer with a sheet side surface and a machine side layer with a machine side surface, the fabric being woven to an overall repeating weave pattern and comprising (i) sheet side layer weft yarns; (ii) machine side layer weft yarns; (iii) a first set of warp yarns comprising only intrinsic binder yarn pairs; and (iv) a second set of warp yarns comprising machine side layer warp yarns, contributing only to the machine side layer and interwoven only with the machine side weft yarns, wherein (a) for each intrinsic binder yarn pair, the first and second members follow complementary identical paths in which the two members alternate with each other to appear in turn in the sheet side layer and the machine side layer and cooperate to define a single combined path in each of the sheet side layer and the machine side layer; (b) in the machine side layer, each member of each intrinsic binder yarn pair follows a path in which either (c) a warp yarn path ratio of numbers of machine side layer warp yarns to single combined paths of the intrinsic binder yarn pairs is at least 1.5:1.