Textiles: manufacturing – Thread finishing – Surface modification of running length
Patent
1995-08-03
1996-12-10
Calvert, John J.
Textiles: manufacturing
Thread finishing
Surface modification of running length
28220, D02G 118
Patent
active
055818587
DESCRIPTION:
BRIEF SUMMARY
This invention relates to making textile strands.
FIELD OF THE INVENTION
EP-A-0 037 118 describes methods for making a bulky flat yarn comprising preparing at least two kinds of thermoplastic synthetic undrawn yarns having different natural draw ratios, simultaneously drawing these prepared yarns at a draw ratio which is equal to or larger than the smallest natural draw ratio of the yarns and releasing drawing tension in the yarns after they are drawn. The yarns are mixed by means of an interlacing nozzle before or after they are drawn. These operations, utilising differences in the elastic recovery of the constituent yarns rather than their shrinkage properties, produce a filament yarn having high bulk and resiliency, without any crimps.
In the article "Lufttexturierung: Produkte und Technologie" (Air texturing: Products and Technology), E. Kreuzer; Chemiefasern/Textilindustrie 35, 87 Jahrgang, October 1985, pages 674 to 678, the texturizing machine FK6T-80 is described, and the possibilities for arranging the machine components to perform different texturing operations explained.
EP-0 057 583 discloses a method for making a textile strand involving differentially overfeeding two separate filamentous strands to a jet device which commingles and interlaces and forms loops in the filaments of the strands and then subjecting the commingled strand to a heating step in which loops formed by the jet are pulled out and in so doing tighten any entanglements present as a result of the jet treatment and thus consolidate the strand. A "twistless" sewing thread can be produced in this way, "twistless" implying not that the thread is without twist, because twist can always be added, but rather that the thread has been produced without the need for twisting which is implicit in the production of sewing thread from staple fibre such as cotton.
The method of EP-0 057 583 is capable of modification to vary the properties of the strand produced and, especially when sewing thread is being produced, can be adapted to produce a more or less "loopy" thread. It is sometimes suggested that the presence of loops in the thread can assist cooling of a sewing machine needle.
All modifications which have been suggested to the fundamental methods of EP-0 057 583 have, however, not resulted in a more economical production of a sewing thread, nor, indeed, could any more economical production be envisioned, since the method itself eliminates the major cost component of the production of conventional sewing thread, namely the twisting step or steps involved in consolidating the staple fibres into a coherent yarn.
The present invention provides methods for making a textile strand which, while maintaining the flexibility of the method of EP-0 057 583 for the production of different specifications of strand, especially in the context of sewing thread, gives, at the same time, the possibility of substantial cost reductions in the process.
SUMMARY OF THE INVENTION
The invention comprises a method for making a textile strand comprising passing two filamentous strands together through a jet device which commingles filaments of the two strands and then subjecting the thus commingled strands to a drawing step in which at least one of the strands is drawn to a stable drawn state.
The strands may be dissimilar.
The strands may be dissimilar in the extent to which they can be drawn. They may be partially drawn before the jet, and they may have been differentially overfed to the jet.
One strand may be overfed to the jet. Typical overfeeds may be 40% to 60%, but smaller and larger overfeeds may be useful in different circumstances.
The strands may be of the same polymer material, and will usually be multifilament strands, but three or more strands may be used, and one such may be a monofilament or a low filament count strand. Staple fibre strand may also be incorporated.
The commingled, drawn strand may be subjected to a heating step--the heating step may be at a temperature at which shrinkage (or more shrinkage would take place were the strand n
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patent: 4497099 (1985-02-01), Scott
patent: 4571793 (1986-02-01), Price
patent: 4615167 (1986-10-01), Greenberg
patent: 4674273 (1987-06-01), Clements et al.
patent: 4835956 (1989-06-01), Sasaki et al.
Aitken John
Curran William W.
Calvert John J.
Felsman Robert A.
J & P Coats, Ltd.
Perdue Mark D.
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