Method for making thread using substantially equal overfeed to a

Details Method for making thread using substantially equal overfeed to a Method for making thread using substantially equal overfeed to a

1996-07-08

1998-09-08

Stryjewski, William

Textiles: spinning, twisting, and twining

Apparatus and processes

With other type crimping or texturing

28220, 28271, 57289, 57290, 57908, D01H 1326

Patent

active

058028366

DESCRIPTION:

BRIEF SUMMARY
FIELD OF THE INVENTION

This invention relates to methods of making thread.
1. Background Information
2. Description of Related Art
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 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.
In addition to the savings produced by avoiding the need to insert high twist levels, the method of EP-0 057 583 allows the use of low cost starting materials in the form of partially oriented yarn (POY) for instance of polyester that are in plentiful supply, in order to produce high-value sewing threads, for example. The sewing threads thereby produced have excellent properties in sewing.
The method of EP-0 057 583 involves feeding at least two strands to an intermingling device (in the form of a texturing jet) at different rates of overfeed so that loops form on the strands thus creating an intermingled textured yarn which is subsequently heat treated to eliminate the bulkiness of the yarn.
It has now been found that the method of EP-0 057 583 can be modified to yield further cost savings and/or other advantages over the prior art methods of sewing thread production, which modifications will also be useful in connection with other yams that can be produced by the process of EP-0 057 583 and indeed in extending the range of yarns which can be produced using that method.


SUMMARY OF THE INVENTION

The invention comprises a method for making a thread comprising: least one is a multifilament yarn, together to an inter mingling device to form a single bulked thread of which the filaments of the starting yarns are intermingled and looped, and that the starting yarns are fed to the intermingling device with substantially equal overfeed.
The starting yarns may comprise yarns having substantially different behaviour under heat and/or tension treatment and may, as in EP-0 057 583, comprise a "core" yarn and an "effect" yarn, the core being present to provide the strength and stability of the finished thread and the effect yarn being present to bind the filaments together. The core yarn will then comprise a major proportion of the thread and is desirably a high tenacity yarn. Again in accordance with EP-0 057 583, the high tenacity yarn (at least) may be produced by overdrawing a POY.
Depending on the linear density and/or tenacity of the required thread, further savings and improvements can be made by starting with two identical yarns--this will result in a saving on inventory costs, since only one yam need to be stocked, and it will almost always be more economical to make a thread out of two identical starting yams than out of two dissimilar yarns. Depending, again, on the properties required in the thread, it may be possible to treat the two yarns identically or differentially. If they have identical treatment, the distinction between core and effect disappears, of course, or each can be regarded as an effect yarn for the other, binding its filaments together as a result of the bulk-reducing treatment, and each can be regarded as a core, contributing strength to the thread. Again, the POY threads can be overdrawn to provide increased strength over the same yarn when normally processed, for example, for making textured knitting yam.
Identical starting yarns may however be differentially treated en route to the intermingling device, as by differential drawing for example. Thus one POY which would have a normal draw ratio of 1.7:1 could be

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