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Polyethylene terephthalate filament having high tenacity for industrial use

a polyethylene terephthalate, high tenacity technology, applied in the direction of geotextiles, yarn, transportation and packaging, etc., can solve the problems of poor post-processing properties, increase in production costs and product quality, and difficulty in obtaining high-tenacity yarns therefrom, so as to increase the draw ratio

Inactive Publication Date: 2007-10-18
HYOSUNG CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0007] The fiber according to the invention is produced by a method of adjusting the areas of contact between the yarn and the godet rollers, on which initial drawing and secondary drawing are performed, so as to increase the draw ratio, thus enabling drawing at a draw ratio of 6.5, which is higher than the conventionally achieved draw ratio of 6.0.

Problems solved by technology

When the draw ratio is increased to obtain a fiber of higher tenacity using such conventional spinning technology, a processing problem of yarn break during spinning and fluffing frequently occur, resulting in poor post-processing properties.
Therefore, the conventional technology leads to an increase in the production costs and lowering of the product quality, and thus it is difficult to obtain high tenacity yarns therefrom.

Method used

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  • Polyethylene terephthalate filament having high tenacity for industrial use
  • Polyethylene terephthalate filament having high tenacity for industrial use

Examples

Experimental program
Comparison scheme
Effect test

examples 1 to 3

[0048] A polyester chip having an intrinsic viscosity of 1.00 was melted, and the melt polymer was extruded through a nozzle having 192 orifices, each orifice having a diameter of 0.6 mm and a ratio of length and diameter (L / D) of 3. The extruded polymer was quenched with air at 15° C., gathered and oiled. Subsequently, the filament was subjected to winding 5 turns at the second godet rollers (primary drawing point) at 100° C., and 7 turns at the third godet rollers (secondary drawing point) at 125° C., with the ratio of the primary draw at the second godet rollers and the third godet rollers to the secondary draw at the third godet rollers and the fourth godet rollers being 75%:25%. A guide in a flat form having a 4 mm-wide groove was applied before the second godet rollers and the third godet rollers. The speed of the fourth godet rollers was set at 2700 m / min. Thus, filaments of 1500 denier each were spun and drawn under the spinning conditions presented in Table 1. The results a...

examples 4 to 6

[0051] A polyester chip having an intrinsic viscosity of 1.05 was melted, and the melt polymer was extruded through a nozzle having 192 orifices, each orifice having a diameter of 0.6 mm and a ratio of length and diameter (L / D) of 3. The extruded polymer was quenched with air at 15° C., gathered and oiled. Subsequently, the filament was subjected to winding 6 turns at the second godet rollers (primary drawing point) at 100° C., and 7 turns at the third godet rollers (secondary drawing point) at 125° C., with the ratio of the primary draw at the second godet rollers and the third godet rollers to the secondary draw at the third godet rollers and the fourth godet rollers being 73%:27%. A guide in a flat form having a 4 mm-wide groove was applied before the second godet rollers and the third godet rollers. The speed of the fourth godet rollers was set at 2700 m / min. Thus, filaments of 1500 denier each were spun and drawn under the spinning conditions presented in Table 2. The results a...

examples 7 to 9

[0054] A polyester chip having an intrinsic viscosity of 1.00 was melted, and the melt polymer was extruded through a nozzle having 192 orifices, each orifice having a diameter of 0.6 mm and a ratio of length and diameter (L / D) of 3. The extruded polymer was quenched with air at 15° C., gathered and oiled. Subsequently, the filament was subjected to winding 5 turns at the second godet rollers (primary drawing point) at 100° C., and 8 turns at a third godet rollers (secondary drawing point) at 125° C., with the ratio of the primary draw at the second godet rollers and the third godet rollers to the secondary draw at the third godet rollers and the fourth godet rollers being 75%:25%. A guide in a flat form having a 4 mm-wide groove was applied before the second godet rollers and the third godet rollers. The speed of the fourth godet rollers was set at 3000 m / min. Thus, filaments of 1000 denier each were spun and drawn under the spinning conditions presented in Table 3. The results are...

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Abstract

A polyethylene terephthalate monofilament obtained by spinning a polyethylene terephthalate chip having an intrinsic viscosity of 0.8 to 1.3, which gives a stress-strain curve exhibiting an elongation of less than 2.5% at an initial stress of 2.0 g / d, with an initial modulus value of 80 to 160 g / d, an elongation of 7.5% or less in a stress range of from 2.0 g / d to 9.0 g / d, and an elongation of at least 2.0% or more in a stress range of from 10.0 g / d to the point of break, is provided.

Description

BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The present invention relates to a polyethylene terephthalate monofilament fiber which gives a stress-strain curve exhibiting an elongation of at least 2.0% or more in a stress range of from 10.0 g / d to the point of break. The monofilament fiber according to the invention is characterized by high tenacity, high modulus and low strain, and thus can be used for the production of high tenacity polyester fiber for industrial use, which is used as the material for industrial rope, reinforcement material for construction, webbing or seatbelt. [0003] 2. Description of the Related Art [0004] As a useful conventional method for enhancing the tenacity of polyester fibers for industrial use, there is available a method of melting a high viscosity chip having an intrinsic viscosity of 1.0 or greater, heating the melt polymer to a temperature of 310° C. to sufficiently melt the polymer, solidifying the polymer at a quenching tem...

Claims

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Application Information

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IPC IPC(8): D02G3/00
CPCD01D5/16D01F6/62Y10T428/2969Y10T428/2913Y10T428/2933D01D5/084D01F6/92D01F9/12D10B2331/04D10B2401/063D10B2505/204
Inventor CHO, DAE-HWANHAN, KYU-CHANSHIM, DONG-SEOK
Owner HYOSUNG CORP
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