Textiles: manufacturing – Thread finishing – Surface modification of running length
Patent
1990-09-07
1992-01-14
Schroeder, Werner H.
Textiles: manufacturing
Thread finishing
Surface modification of running length
D02G 116
Patent
active
050798138
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
This invention relates to improvements in interlacing apparatus for multifilamentary yarns, and more particularly to an improved configuration for the yarn passageway in an interlacing jet.
BACKGROUND
The interlacing of multifilamentary yarns was first taught by Bunting and Nelson, e.g., in U.S. Pat. Nos. 2,985,995 and 3,115,691. Interlacing is now conventional for high speed spinning processes. It is desirable to improve the efficiency of the apparatus used for interlacing, commonly referred to as interlacing "jets".
The interlacing effect has generally in practice been achieved by directing streams of high velocity fluid against a planar surface, thereby forming contiguous fluid vortices, and passing a yarn axially between the streams and parallel to the planar surface, as disclosed by Bunting and Nelson. Essentially the same technique is still used today. The planar surface against which the high velocity fluid streams are directed is often referred as a "striker plate". Since several thread lines are generally spun and wound up on a single position of a spinning machine, it is generally convenient to assemble multiple jets into a single unit, e.g. in "stacked" relationship, as shown in FIGS. XI and XII of Christini et al. U.S. Pat. No. 3,936,577 and Reissue 29,285, and as item 12 of FIG. 1 of Harris U.S. Pat. No. 4,932,109, issued June 12, 1990, so that the backside of one jet acts as the striker plate for the adjoining jet. Accordingly, the cross-sectional configuration of these jet members has been rectangular, as indicated in the above Figures. The yarn passageways between adjacent jets in these assemblies have accordingly been slots with parallel sides, i.e., of constant dimensions. Item 12 of Harris' FIG. 1 illustrates an existing jet assembly that has been used by us before the present invention.
SUMMARY OF THE INVENTION
We have now found that a significant improvement in efficiency can be achieved by using such stacked jets with striker surfaces that have a gentle convex curve, instead of being planar. We use jets whose yarn passageways flare outwardly instead of having essentially parallel sides. Preferably, the outward flaring occurs on both sides of the yarn passageway, as when oval-shaped jet members are used as shown in FIG. 1 herein, as opposed to the essentially rectangular shape of the existing jet members referred to above, that define yarn passageways with parallel sides.
Accordingly, the invention provides an improved interlacing jet comprising a striker surface and a wall member containing at least one conduit adapted to project a stream of pressurized fluid against said striker surface, said wall member and said striker surface defining therebetween a passageway with an entrance and an exit at either end for a yarn, the improvement being characterized in that said striker surface is gently convexly curved whereby the entrance and exit of said yarn passageway are flared outwardly with respect to the location where said stream is projected against said striker surface. Preferably both the wall member and the striker surface are convexly curved. Conveniently in a stacked jet assembly, a plurality of yarn passageways may be provided between adjacent jet members with wall members that are convexly curved on one side to provide a striker surface and on another side that contains at least one said conduit or jet.
Thus, a preferred improved stacked interlacing jet assembly comprises a plurality of jet members with walls that are assembled to provide a plurality of yarn passageways between walls of adjacent jet members, said walls containing fluid conduits each adapted to project a stream of pressurized fluid against the opposing wall of the adjacent jet member located on the other side of said yarn passageway, the improvement being characterized in that said yarn passageways are outwardly flared at least downstream from the location of said conduits, and preferably both upstream and downstream. Preferably these walls are curved to provide the outward flaring of
REFERENCES:
patent: Re29285 (1977-06-01), Christini et al.
patent: 2985995 (1961-05-01), Bunting et al.
patent: 3115691 (1963-12-01), Bunting et al.
patent: 3436798 (1969-04-01), Nicita
patent: 3574249 (1971-04-01), Cannon
patent: 3936577 (1976-02-01), Christini et al.
patent: 4715097 (1987-12-01), Bogucki-Land
patent: 4932109 (1990-06-01), Harris
Agers Brian M.
Daughtry Jimmie S.
Goldstein Arnold S.
Johnson Steven B.
Tuggle George S.
Calvert John J.
E. I. Du Pont de Nemours and Company
Schroeder Werner H.
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