Textiles: manufacturing – Textile product fabrication or treatment – Cross laying by divergent thread conveying members
Patent
1990-04-05
1992-03-31
Schroeder, Werner H.
Textiles: manufacturing
Textile product fabrication or treatment
Cross laying by divergent thread conveying members
156440, 66 84A, D04H 304
Patent
active
050995545
DESCRIPTION:
BRIEF SUMMARY
The present invention relates broadly to the production of non-woven fabrics employing weft thread, that is to say)threads extending across the width of the fabric. In a woven fabric, the weft threads are retained in warp threads by interlacing, that is to say, each weft thread passes successively under and over warp threads. In a non-woven fabric of the kind to which this invention primarily relates, the weft threads are not interlaced with warp threads but are simply laid across a longitudinal web or substrate there being a single substrate, in which case all weft threads are on one side of that substrate, or two substrates, in which case, the weft threads are sandwiched between the two substrates. It is to be understood however, that the invention in its broadest sense is not restricted to the formation of what are usually referred to as non-woven fabrics, since the invention provides a new method of producing any fabric wherein a weft array is formed and then combined with a substrate, and it might be used for example, in the manufacture of a knitted fabric in which the weft array is combined with a knitted substrate.
It is, of course, necessary to secure the weft threads to the substrate: the manner in which this is done is of no more than secondary importance in relation to the present invention; conventional techniques in the case where the substrate is a sheet of warp threads, include applying a chemical binder to the threads so that they adhere at the points where the weft threads cross the warp threads, or (in the case of synthetic threads) welding the weft threads to the warp threads by the application of heat or chemical solvent. application of heat or chemical solvent. In the case of a knitted substrate, the stitches of the substrate may be formed around the weft yarns.
Although by appropriate selection of the weft yarn, and the warp yarn where a warp is present, it is possible to make a wide variety of non-woven fabrics by the invention, it is particularly suitable for the manufacture of scrim material.
In theory, a manufacturing process which involves only laying the weft threads from side-to-side (i.e., selvedge to selvedge or weftwise) across a longitudinal web should enable much higher production rates to be achieved than is possible with a weaving process which involves shedding of the warp. However, some of the machines which have been developed to produce this kind of non-woven fabric are expensive and there are problems which restrict the practical operational speeds. Moreover, some of the known methods are very wasteful of weft yarn.
A primary object of the invention is to provide a method of manufacturing a fabric employing a weft yarn array which can operate at high production rates. It is a further object of the invention to provide a fabric producing machine which is adapted to operate at high production rates, and which is not itself very expensive. It is a still further object to minimize yarn wastage.
There are known methods of manufacturing fabrics in which a weft carrier laying a set of weft yarns reciprocates in a lateral (weftwise) direction across a weftspace between two sets of weft retainers and moves in a longitudinal (warpwise) direction relative to the weft retainers at one or both ends of its weftwise traverse to lay the set of weft yarns across the weftspace at each lateral traverse and hook each weft yarn around two non-successive weft retainers at each side of the weftspace.
The longitudinal relative movement between the weft carrier and the weft retainers can be obtained by moving the weft retainers in a forward direction, and in any case, they may be moving in this forward direction as part of the weft yarn array formation; but it is preferable to provide for jogging of the weft carrier relatively to the weft retainers at one or both ends of the carrier lateral traverse. In any event, the longitudinal movement has to be equal to the longitudinal distance occupied by the complete set of weft yarns on the carrier. However, this longitudinal movement creates waste
REFERENCES:
patent: 4016631 (1977-04-01), Cole
patent: 4030168 (1977-06-01), Cole
patent: 4068357 (1978-01-01), Goldsworthy et al.
Knitting Times, vol. 41, NO. 47, Nov. 13, 1972, pp. 85-103, Reisfeld, A., "Warp Knit Fabrics and Products--Part 23".
Calvert John J.
James Dewhurst Limited
Jenkins Richard E.
Schroeder Werner H.
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