Stock material or miscellaneous articles – Hollow or container type article – Polymer or resin containing
Patent
1995-02-22
1997-03-11
Bell, James J.
Stock material or miscellaneous articles
Hollow or container type article
Polymer or resin containing
139383A, 428192, 428193, 442203, B29D 2200
Patent
active
056099312
DESCRIPTION:
BRIEF SUMMARY
The invention concerns paper machine and like clothing, and has more particular reference to an endless woven fabric having weft loops.
The object of the invention is to provide an endless woven papermakers fabric, and particularly a pulp fabric, having weft loops which are essentially orthogonal with respect to the plane of the fabric.
According to the present invention there is proposed a method of weaving a papermakers fabric having weft loops wherein the loop forming weft yarn is woven as two picks in a common shed in each respective fabric layer as it exists in the loom, said yarn being wrapped about a core yarn at one edge of the fabric as it exists in the loom between successive weft insertions in said common shed, characterised in that the fabric is of plain weave construction and the method includes the further step of shifting the weave pattern longitudinally of the fabric by one pick at a position remote from said one edge prior to inserting two picks to form the next loop at said one edge.
According to a further feature of the invention the weave pattern shift is effected at the other edge of the fabric as it exists in the loom.
According to a still further feature, the method includes the further step of resin treating the loops to maintain a substantially orthogonal relationship between the loops and the plane of the fabric.
The invention also includes an endless woven papermakers fabric having weft loops, wherein said loops are substantially orthogonal with respect to the plane of the fabric and each loop is formed by two successive picks woven in a common shed in that region of the fabric adjacent each respective loop, characterised in that the fabric is formed as a tube with linked ends, the fabric being a plain weave and the weave pattern being shifted longitudinally of the fabric by one pick at a position remote from the linked ends of the fabric.
According to a still further preferred feature, the weave pattern is shifted longitudinally of the fabric by one pick at a position approximately midway between the linked ends of the fabric.
The invention will now be described further, by way of example only, with reference to the accompanying diagrammatic drawings illustrating one embodiment thereof and in which:
FIG. 1 is an elevation of an endless fabric as it exists on the loom and illustrates the two-layer nature thereof during manufacture;
FIG. 2 is a plan view of the endless fabric of the invention produced in a similar manner to that illustrated in FIG. 1 and opened up to show, inter alia, the weave pattern in the region corresponding to region A of FIG. 1; and
FIG. 3 is a weaving diagram showing the shed changes appropriate to the weft shift shown in FIG. 2.
Referring now to FIG. 1 of the drawings, an endless fabric comprises warp and weft yarns 11, 12 woven together to give upper and lower layers 13, 14 in the loom as is conventional, weft loops 15 being formed by weaving the weft yarns about a monofilament core yarn 16 provided at one side of the loom.
On completion of the weaving operation the core yarn 16 is removed, and the tubular woven fabric is opened out to give a flat structure having loops 15 at the respective ends thereof, such loops being formed from weft yarns and the weft yarns extending in the intended machine direction of the fabric.
On application to a papermakers machine the loops 15 at the respective fabric ends are interdigitated to define a tunnel to receive a jointing wire (not shown).
In the prior method aforesaid, the warp shedding is changed between the successive picks introduced in a given fabric layer, and thus the weft yarn as it exists about the core yarn 16 to form the loop 15 follows a helical path, such helical configuration being retained by the loop 15 on removal of the core yarn 16.
On interdigitation of the loops and insertion of the jointing wire the permeability of the fabric in the region of the join is different from the body of the fabric, but a more significant disadvantage lies in the extent to which the loops abrade in use, the rate of wea
REFERENCES:
patent: 4636426 (1987-01-01), Fleischer
patent: 4842212 (1989-06-01), Loiselle et al.
patent: 4846231 (1989-07-01), Penven
patent: 4991630 (1991-02-01), Penven
Bell James J.
Scapa Group PLC
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