Textiles: spinning – twisting – and twining – Apparatus and processes – With drafting
Patent
1987-09-03
1989-05-02
Petrakes, John
Textiles: spinning, twisting, and twining
Apparatus and processes
With drafting
19236, 19246, 19289, 57333, 57350, D01H 528, D01H 113
Patent
active
048256331
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND AND SUMMARY OF THE INVENTION
The instant invention relates to a process for the spinning of fiber material which is subjected to prestretching in a drafting mechanism and to main stretching (i.e., drafting), and which is then spun into a yarn by means of a pneumatic torsion device, as well as to a device to carry out the process.
In a known device the fiber sliver to be spun is stretched to the desired thickness by means of drafting equipment and is then spun into yarn by means of a pneumatic torsion element (DE-OS No. 2,722,319, corresponding with U.S. Pat. No. 4,124,972; and EP-PS No. 0,131,170 corresponding with U.S. Pat. No. 4,565,063.) The yarns spun with such a device are low-bulking and also fail to attain the strength and uniformity of ring yarns. For this reason they are only suitable for a limited range of application.
It is the objective of the instant invention to create a process and a device of the type mentioned above, by means of which high-bulking, soft yarns of a character similar to that of ring yarns can be produced in a simple manner.
This objective is achieved according to the invention in that in the course of stretching, the fiber sliver is gathered together to a minimum width which is at least approximately 1.5 times the diameter of the torsion element, and in that the fiber sliver is not gathered together any further after this first gathering together before being subjected to torsion while said diameter is maintained. It has been shown that controlled spreading of the outer fibers is thus achieved, said fibers looping around the yarn core during the subsequent twisting process so that when the false twist to which the yarn core has been subjected is untwisted these outer fibers are on the one hand incorporated into the yarn core, while on the other hand however, not all of them surround the yarn core with the same density. In this way a hairy and high-bulking yarn with the character of a ring yarn is produced. The fiber sliver is preferably gathered together to its minimum width during pre-stretching, immediately before main stretching. The minimum width should not be more than approximately 2.5 times the diameter of the torsion element. In this way, high spinning speeds can be achieved. It has been shown that the degree to which the fiber sliver is gathered together as it enters the pneumatic torsion element is decisive for the way in which the outer fibers will loop around the yarn core during spinning. In order to maintain control of the relationship required for this, the fiber sliver is gathered together, before entering the pre-stretching phase, only to a width which is greater than the width to which the fiber sliver is gathered together before entering the main stretching phase, in preparation of the entry into the pneumatic torsion element. Gathering the fiber sliver together before it enters the pre-stretching phase to a width which is approximately 1.3 times the width before the main stretching phase has proven to be especially effective. Stretching should be minimal while the fiber sliver is gathered together to the desired minimum width so that this process can be controlled more effectively. To achieve nevertheless a high degree of overall stretching, the pre-stretching phase is divided up, with the first pre-stretching being stronger than the second pre-stretching. Stretching between 1:1.1 and 1:1.5 has been shown to be especially advantageous during the second pre-stretching phase.
The fibers which are spread away from the fiber material leaving the drafting equipment have a tendency to catch, through adhesion, on the normally rubber-coated upper roll of the outlet cylinders of the drafting equipment. It has been shown that these fibers can also easily be fed to the torsion element if the fiber material leaving the drafting equipment has been deflected from its previous conveying plane n direction of the upper roll.
To carry out the described process, a device is used in which the width of the condenser before the main stretching field measures in acc
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Artzt Peter
Dallmann Harald
Egbers Gerhard
Ziegler Kurt
Petrakes John
Schubert & Salzer
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