US 8,147,653 B2Granted

High fiber support intrinsic warp-tied composite forming fabric

AssigneeAstenJohnson, Inc.

InventorsRichard Stone, Roger Danby

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Abstract

A woven filtration fabric for cellulosic sheet formation. The warp yarns comprise intrinsic binder yarn pairs, and a set of dedicated machine side layer warp yarns. The members of each intrinsic binder yarn pair alternate with each other to define a single combined path in each layer. Whenever a member interweaves with a machine side layer weft yarn, at least one machine side layer warp yarn interweaves with the same weft yarn in the same knuckle. In some embodiments, the members form double knuckles in the machine side layer, firstly together with a first machine side layer warp yarn and then together with a second machine side layer warp yarn. The warp yarn path ratio of machine side layer warp yarns to single combined paths of the intrinsic binder yarn pairs is at least 1.5:1. The fabrics provide increased center plane resistance, resulting in improved drainage and sheet uniformity.

Claims15

Dependent claims

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
(A) for every pair, at each location at which a member of an intrinsic binder yarn pair interweaves with a machine side layer weft yarn to form a knuckle, at least one of the machine side layer warp yarns interweaves with the same machine side layer weft yarn in the same knuckle;
or
(B) for every pair, each member of the pair interweaves in sequence with two of the machine side layer weft yarns together with a first member of a pair of adjacent ones of the machine side layer warp yarns at a first interweaving point, and together with a second member of the pair of adjacent ones of the machine side layer warp yarns at a second interweaving point;
and
(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.

10 more elements

Dependencies are inferred from the claim text.