Plastic and nonmetallic article shaping or treating: processes – With twining – plying – braiding – or textile fabric formation
Patent
1998-02-02
1999-10-12
Tentoni, Leo B.
Plastic and nonmetallic article shaping or treating: processes
With twining, plying, braiding, or textile fabric formation
2642107, 2642108, 26421112, 26421115, 26421117, 425 66, 425377, 4253782, 4253791, 4253822, 425464, D01D 5084, D01D 5088, D01D 516, D01F 662
Patent
active
059650737
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to a process for producing polyester yarns wherein melt-spun polyester filaments are cooled downstream from a spinning nozzle or spinneret in a cooling zone to at least a congealing temperature and then, for the purpose of stretching, is heated in a heating zone to a temperature above the glass transition temperature or the solidification point, and then for generating the requisite stretching tension is passed in an unbundled orientation through the heating zone and subjected to a stream or blast of a of gaseous medium in counterflow.
BACKGROUND OF THE INVENTION
A process of this type is known in which microfilaments with an individual titer less than 1.0 dtex are drawn through a heating zone with a withdrawal speed up to 8000 m/min for final stretching and are subjected to blowing in counterflow. After this known process, full stretched synthetic resin threads are produced without after treatment which can be worked up into especially fine and tight fabrics (see PCT/DE 9100420).
OBJECT OF THE INVENTION
It is an object of the invention to provide a process and an apparatus which permits fabrication of polyester yarns with optimum characteristics for technological applications in a rational manner.
SUMMARY OF THE INVENTION
These objects are achieved by a process according to the invention wherein the polyester filaments with an individual titer of 1.0 dtex to 7.5 dtex are after-stretched at temperatures of 80.degree. C. to 250.degree. C. with a stretching ratio of 1:1.5 to 1:1.15 and are wound up at a wind-up speed of 5000 m/min to 8000 m/min. From the polyester filaments produced by the process according to the invention, technologically suitable polyester yarns in an overall titer ranger of about 100 dtex to 1100 dtex or greater can be produced, for example, by bundling. By technologically suitable polyester yarns, we mean polyester yarns which are especially suitable for technological applications, namely, for example, as sewing yarns in fabrics in tarpaulin-type fabrics, tent fabrics, sail fabrics, tire cord, hoses, V-belts, conveyor belts, rope, and the like. The polyester filaments fabricated in accordance with the invention and the polyester yarns formed therefrom are characterized by high quality and can be produced in an especially rational manner.
Further important features of the invention are given below. Thus the temperature of the polyester filaments immediately after the melt spinning can amount to 200.degree. C. to 350.degree. C., especially 250.degree. C. to 310.degree. C. The polyester filaments are cooled prior to entry into the heating zone to about 80.degree. C. Thereafter the polyester filaments are advantageously heated to a temperature of 200.degree. C. to 350.degree. C., advantageously 225.degree. C. to 285.degree. C. by a blowing in counterflow and, simultaneously prestretched. To increase the friction resistance or to generate the requisite stretching tension, the polyester filaments are advantageously blown with a quantity of air--the gaseous medium is preferably air--in an amount of 5 m.sup.3 /h to 25 m.sup.3 /h in counterflow and with a withdrawal velocity of 3000 m/min to 7500 m/min through the counterflow. While the cooling zone, which is transversely blown through by the cooling air, has a length of 800 mm to 1200 mm, the length of the heating zone with counterflow blowing amounts to 1.2 m to 2.5 m. After emerging from the heating zone usually a preparation process can be carried out upon the prestretched polyester filaments.
Further, according to the teachings of the invention, the air quantity and the temperature of the counterflow air are so adjusted that a thread elongation of less than 50%, preferably 30% to 40% is produced. Furthermore, the withdrawal speed of the polyester filaments, the air quantity and the temperature of the counterflow air are so adjusted that a tensile strength of the polyester filaments greater than 3.2 cN/dtex, advantageously 3.4 cN/dtex to 4.5 cN/dtex, is produced. In addition, it is possi
REFERENCES:
patent: 4743504 (1988-05-01), Carr
patent: 5019316 (1991-05-01), Ueda et al.
patent: 5558825 (1996-09-01), Ueda et al.
patent: 5698146 (1997-12-01), Schippers et al.
Eiflander Ingo
Geier Rudolf
Hartig Jurgen
Dubno Herbert
John Brown Deutsche Engineering GmbH
Tentoni Leo B.
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