Textiles: manufacturing – Thread finishing – Surface modification of running length
Patent
1982-03-25
1985-08-20
Mackey, Robert R.
Textiles: manufacturing
Thread finishing
Surface modification of running length
28274, D02J 108, D02G 116
Patent
active
045355169
DESCRIPTION:
BRIEF SUMMARY
The invention relates to an apparatus for the interlacing of multifilament yarns to produce fixed point multifilament yarns and to a process for the operation of said apparatus.
The expression fixed point multifilament yarns refers to yarns consisting of a plurality of filaments which are entangled at more or less regular intervals at so-called fixed points (British: interlaces, entanglements), also frequently called "Knoten" (knots) in the German language, although they do not constitute knots. These fixed point-forming entanglements are produced by driving the filaments through a passage to prevent excessive lateral deviation thereof. In this passage, the filaments are exposed to at least one gas stream which entangles them to form the fixed points in the yarn, the filaments extending substantially parallel to each other between the fixed points.
The fixed points are used to provide the filaments of the multifilament yarn with a cohesion (fiber contact) sufficient for subsequent processing. A filament means a filament spun from a nozzle orifice (and also called "Fibrille" (fibril) in Switzerland, capillaries, elementary fibers, or endless fibers). This cohesion of the filaments of the multifilament yarn may be necessary for various reasons, for example to avoid the excessive spreading out of the filaments due to electrostatic charges, to avoid the splitting and damaging of the yarn by the guide teeth in weaving, or for different reasons especially to permit specific subsequent processing operations.
The filament materials may be the materials generally used in multifilament textile yarns (endless chemical yarns). They are the materials used in the production of endless synthetic fibers.
In Anglo-American linguistic usage endless synthetic fibers are now generally called filaments. The filaments may consist especially of uncrimped or possibly texturized (crimped) high molecular weight polymers (e.g. polyesters, polyamides, polyacryls, etc.), or of regenerated fiber materials (e.g. viscose, copper or acetate rayon). Other materials are also appropriate.
In known apparatus of this type (U.S. Pat. No. 2,985,995 and U.S. Pat. No. 4,069,565), filaments are driven through a circular straight passage of constant cross section of a whirling unit. One or more blasting nozzles open in the passage. The inner cross section of the nozzles is constant in the axial direction and the direction of blast is perpendicular to the median longitudinal axis of the passage. The maximum velocity of the air stream flowing out of such a blasting nozzle can reach the speed of sound, but only with a great consumption of air, which considerably increases the cost of producing fixed point multifilament yarns.
It is desirable to provide the multifilament yarn with a relatively high fixed point density (fixed point density=number of fixed points per meter of yarn length) of at least 20 fixed points/meter. In known apparatus, at medium to high filament feed rates, the fixed point density is inversely proportional to the filament feed rate. To increase the fixed point density, to date, a plurality of blasting nozzles has been provided in each passage, but the resulting fixed point density could not be substantially increased although the compressed air consumption had been considerably increased. Therefore, one object of the invention is to supply an apparatus of the above cited type which provides for the use of higher filament feed rates with the desired fixed point density and/or for a reduction in compressed gas consumption at given fimament feed rates.
Accordingly, it is an object of the invention to provide an interlacing apparatus which is capable of producing fixed point multifilament yarns in an efficient manner.
It is another object of the invention to produce fixed point multifilament yarns with high fixed point densities.
It is another object of the invention to be able to produce fixed point multifilament yarns using a gas stream in an infrasonic speed range.
Briefly, the invention provides an interlacing unit for an apparatus
REFERENCES:
patent: 3167847 (1965-02-01), Gonsalves
patent: 3237269 (1966-03-01), Hawkins
patent: 3262179 (1966-07-01), Sparling
patent: 3605397 (1971-09-01), Irwin et al.
patent: 3750242 (1973-08-01), Lloyd et al.
patent: 3824656 (1974-07-01), Bauch
patent: 3958310 (1976-05-01), Blanc et al.
patent: 4251904 (1981-02-01), Sano et al.
Egbers Gerhard
Weinsdorfer Helmut
Mackey Robert R.
Maschinenfabrik Rieter AG
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