Textiles: knitting – Cleaning attachments
Patent
1998-04-17
2000-09-26
Worrell, Danny
Textiles: knitting
Cleaning attachments
66203, D04B 3532
Patent
active
061229407
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
The present invention relates to a process for the production of warp-knitted fabrics, constituted from at least 50% by discontinuous fiber yarn. The invention also relates to warp-knitted fabrics comprising at least 50% discontinuous fiber yarn, as well as the apparatus for the production thereof. As is known, knitted fabrics may be obtained according to various production processes, in particular by knitting on circular knitting looms, for instance for the production of woman stockings, by knitting on Raschel looms to obtain open-work fabrics, curtains, laces, patterned fabrics in general, and by knitting on warp-knitting looms for warp-knitted fabrics, to obtain fabrics intended for the technical-industrial field, furniture and upholstery, footwear, the medical field, clothing and the like.
As is also known, with the working processes on circular looms and with those on Raschel type loom, it is possible to utilize both yarns constituted of continuous fibers such as nylon, polyester and the like obtained with chemical processes, and yarns constituted of discontinuous fibers obtained by means of mechanical spinning processes starting from flock and staple fibers or in any case from short and fragmented fibers, such as cotton, wool, polyesters, etc., as well as wool or cotton wastes and the like.
With the working processes on warp-knitting looms for warp-knitted fabrics, it is possible to produce a very thin knitting with very high working speed, and therefore with very high yields, but, as is known, by this type of working it is possible to use only continuous fiber yarns obtained from chemical processes, or mixed yarns prevailingly composed, for at least 50%, of continuous fibers.
Discontinuous yarns, more hairy and less resistant than the continuous ones, have proved unfit for being worked according to this type of working, as frequent interruptions occur during the working due to loom stopping, yarn breaking, etc. The same drawbacks take place, as is known, with mixed yarns, when the content of discontinuous yarns is higher than 50%.
Object of the present invention is to provide a process for the production of warp-knitted fabrics, with yarns substantially and prevailingly constituted of discontinuous fibers, i.e. having a content of 50% to 100% of discontinuous fibers, using warp-knitting looms for warp-knitted fabrics having a plurality of reeds, high speed and high yield.
Another object of the invention is to realize and provide fabrics to be used in technical-industrial fields, furniture, upholstery, footwear, in health-sanitary field, for clothing and the like, having a high thickness, produced from prevailingly discontinuous fibers, in a quantity in excess of 50%, using high speed, high yield warp-knitting looms of the tricot type.
Still a further object of the invention is to realize an apparatus suitable for the realization of a process of warp-knitting with discontinuous or prevailingly discontinuous yarns.
These and still other objects and related advantages which will appear from the following description are achieved by a process for the production of warp-knitted fabrics produced on looms having a plurality of bars. The process comprises an unwinding stage of the yarn from the yarn supporting and housing beams, a yarn collection and winding stage on winding tubes synchronized with the stage of yarn unwinding, and a knitting stage of the yarn by high speed axial movements of a plurality of reeds placed close to one another. The knitting stage is realized in the presence of a continuous or intermittent current of a gas circulating in correspondence of the reeds, suitable to remove powder particles and/or fiber fragments from the surface of the reeds.
As is known, the reeds are constituted of a plurality of sinkers located next to one another on a bar along the whole reed, and act cumulatively in correlation with the needles-carrying bar. Particularly, the needles are advantageously compound needles.
According to this invention, it has been found that by operating in a gas curren
REFERENCES:
patent: 3378998 (1968-04-01), Shackelford
patent: 3461693 (1969-08-01), Klaeui
patent: 3978691 (1976-09-01), Schmid
patent: 4487040 (1984-12-01), Patel et al.
Melliand Textilberichte Intern. -vol. 65 n. 10 Oct. 1984.
SITIP S.p.A.
Worrell Danny
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