US 5,826,627 AGranted

Composite papermaking fabric with paired weft binding yarns

AssigneeJWI Ltd.

InventorsRonald H. Seabrook, Dale B. Johnson, Derek G. Chaplin, Rex Barrett

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Abstract

A composite forming fabric in which the woven paper and machine side layers are interconnected by pairs of intrinsic weft binder yarns which interweave with the paper side layer to occupy an unbroken weft path. Each member interweaves sequentially with the warps of the paper side layer and with at least one warp of the machine side layer. Each part of the unbroken weft path is separated from adjacent parts by at least one paper side layer warp yarn. The unbroken weft path is the same, or different, to the weft path of the immediately adjacent paper side layer weft yarns. This arrangement overcomes the paper side layer surface imperfections, which cause an unacceptable level of marking, hitherto associated with the use of intrinsic weft binder yarns in composite fabrics.

Claims23

Dependent claims

A composite forming fabric comprising in combination a paper side layer having a paper side surface, a machine side layer, and a plurality of pairs of first and second members which together comprise pairs of intrinsic weft binder yarns which bind together the paper side layer and the machine side layer, wherein:

(i) the paper side layer and the machine side layer each comprise warp yarns and weft yarns woven together in a repeating pattern, and the paper side layer and the machine side layer together are woven in at least 12 sheds;
(ii) in the paper side surface of the paper side layer the repeating pattern provides a weft yarn path in which the paper side layer weft yarn floats over 1, 2 or 3 consecutive paper side layer warp yarns;
(iii) each of the pairs of intrinsic weft binder yarns occupy one unbroken weft path in the paper side layer;
(iv) in the paper side layer the weave pattern of the unbroken weft path occupied by a pair of intrinsic weft binder yarns is the same, or different, to the weave pattern of the weft path occupied by the immediately adjacent paper side layer weft yarns;
and
(v) the number of warp yarns in the paper side layer is equal to the number of warp yarns in the machine side layer;
and wherein the pairs of intrinsic weft binder yarns are woven such that:
(a) in a first segment of the unbroken weft path:
(1) the first member of the pair interweaves with a first group of warps to occupy a first part of the unbroken weft path in the paper side surface of the paper side layer;
(2) the first member of the pair floats over 1, 2 or 3 consecutive paper side layer warp yarns;
and
(3) the second member of the pair interweaves with at least one warp yarn in the machine side layer;
(b) in an immediately following second segment of the unbroken weft path:
(1) the second member of the pair interweaves with a second group of warps to occupy a second part of the unbroken weft path in the paper side surface of the paper side layer;
(2) the second member of the pair floats over 1, 2 or 3 consecutive paper side layer warp yarns;
and
(3) the first member of the pair interweave with at least one warp yarn in the machine side layer;
(c) the first and second segments are of equal or unequal length;
(d) the unbroken weft path in the paper side surface of the paper side layer occupied in turn by the first and the second member of each pair of intrinsic weft binder yarns in the paper side layer has a single repeat pattern;
and
(e) in the unbroken weft path in the paper side surface of the paper side layer occupied in turn by the first and second members of each pair of intrinsic weft binder yarns, each succeeding segment is separated in the paper side surface of the paper side layer by at least one paper side layer warp yarn.

18 more elements

(i) the paper side layer and the machine side layer each comprise warp yarns and weft yarns woven together in a repeating pattern, and the paper side layer and the machine side layer together are woven in at least 12 sheds;
(ii) in the paper side surface of the paper side layer the repeating pattern provides a weft yarn path in which the weft yarn floats over 1, 2 or 3 consecutive paper side layer warp yarns;
(iii) each of the pairs of intrinsic weft binder yarns occupy one unbroken weft path in the paper side layer;
(iv) in the paper side layer the weave pattern of the unbroken weft path occupied by a pair of intrinsic weft binder yarns is the same, or different, to the weave pattern of the weft path occupied by the immediately adjacent paper side layer weft yarns;
and
(v) the number of warp yarns in the paper side layer is equal to the number of warp yarns in the machine side layer;
and wherein the pairs of intrinsic weft binder yarns are woven such that:
(a) in a first segment of the unbroken weft path:
(1) the first member of the pair interweaves with a first group of warps to occupy a first part of the unbroken weft path in the paper side surface of the paper side layer that is substantially identical to that of its adjacent paper side layer wefts;
and
(2) the second member of the pair interweaves with at least one warp yarn in the machine side layer;
(b) in an immediately following second segment of the broken weft path:
(1) the second member of the pair interweaves with a second group of warps to occupy a second part of the unbroken weft path in the paper side surface of the paper side layer that is substantially identical to that of its adjacent paper side layer wefts;
and
(2) the first member of the pair interweaves with at least one warp yarn in the machine side layer;
(c) the first and second segments are the same length;
(d) the unbroken weft path in the paper side surface of the paper side layer occupied in turn by the first and the second member of each pair of intrinsic weft binder yarns in the paper side layer has a single repeat pattern;
and
(e) in the unbroken weft path in the paper side surface of the paper side layer occupied in turn by the first and second members of each pair of intrinsic weft binder yarns, each succeeding segment is separated in the paper side surface of the paper side layer by at least one paper side layer warp yarn.

16 more elements

Dependencies are inferred from the claim text.