Dimensionally stable polyester yarn and preparation thereof

A technology of dimensional stability and polyester yarn, which is applied in the field of impregnated cords and the manufacture of such polyester multifilament yarns. It can solve the problems of non-usable yarns, unstable spinning process, etc., and achieve the effect of stable yarn production.

Inactive Publication Date: 2014-02-26
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It has been found that the manufacture of polyester yarns in a continuous spin-draw-wind process at winding speeds above 6000m / min results in an unstable spinning process (large number of broken filaments in the drawn yarn), or in The yarn in the process does not have favorable performance properties unless the undrawn yarn has a crystallinity of less than 16%

Method used

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  • Dimensionally stable polyester yarn and preparation thereof

Examples

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Effect test

example 1

[0076] DMT-based polyethylene terephthalate chips having a relative viscosity of 2.04 have been spun at a temperature of 305°C, where the relative viscosity is measured in an Ubbelohde Viskosimeter (DIN 51562) at 25°C at 125 In-solution measurements in grams of 2,4,6-trichlorophenol in a mixture of phenol with a TCF:F ratio of 7:10 on a weight basis. A yarn count of 1440 dtex has been spun using a spinneret having 331 holes with a diameter of 800 μm. A 150 mm heating sleeve at a temperature of 200° C. was used below the spinneret. The spun filaments are then solidified in two steps by a gaseous cooling medium, wherein in a first cooling step the gaseous cooling medium flows transversely through a bundle of filaments and exits the bundle substantially on the side directly opposite the inflow, and in the second cooling step In the second cooling step, the tow is further cooled by self-absorption of a gaseous cooling medium around the tow. Heating sleeves and cooling have been ...

example 2

[0079] The spinning of polyester yarn was carried out as in Example 1, but the polyethylene terephthalate core was based on PTA, the relative viscosity was 2.18, and the spinning speed at the first godet was set as in Example 2A It is 4667m / min, and it is set to 4827m / min in Example 2B.

[0080] The properties of undrawn polyester yarns, drawn polyester yarns and simulated cured dipped cords are summarized in Table 1.

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Abstract

A continuous spin-draw-winding process to prepare a drawn polyester yarn suitable for use in high-speed tires and run-flat tires having high energy to break in combination with a good dimensional stability, comprising extruding molten polyester through spinning holes in a spinneret to form a bundle of molten spun filaments, solidifying the spun filaments by a gaseous cooling medium, fixing the spinning speed of the solidified filaments at a first godet in the range of 4050 to 5000 m / min for DMT-based polyester or 4500 to 5500 m / min for PTA-based polyester, drawing the solidified filaments at a draw ratio less than 1.75 for DMT-based polyester or less than 1.60 for PTA-based polyester, to form drawn filaments. The drawn polyester yarn has a high amorphous orientation distribution, a high crystallinity and a coarse structure. Dipped cords comprising such polyester drawn yarns exhibit excellent dimensional stability at higher temperatures.

Description

technical field [0001] The present invention relates to reinforced stretched polyester multifilament yarns for technical applications, in particular for pneumatic tyres, having high breaking energy and good dimensional stability, and to impregnated cords comprising such yarns. The polyester multifilament yarns and dipped cords according to the invention are especially useful for high-speed tires / high-speed tires and safety tires / run-flat tires. The invention therefore also relates to tires comprising such yarns and impregnated cords. Furthermore, the present invention relates to a method for producing such polyester multifilament yarns. Background technique [0002] Polyester yarns employed in technical applications, such as in dipped cords for pneumatic tires, are well known. They have been used for many years as reinforcements in tires. However, to date, these polyester technical yarns have not performed well enough for use in casings of high operating temperature pneum...

Claims

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Application Information

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IPC IPC(8): D01F6/62D01D5/16D01D5/088D02G3/48B60C9/00
CPCD01D5/088D01D5/16D01F6/62B60C9/0042D02G3/48D02G3/367D10B2331/04B60C9/00
Inventor B·克林斯J·费林克P·J·M·奥尔勒曼斯
Owner API INST
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