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High tenacity polyester yarns

a high-tenacity, polyester technology, applied in the direction of yarn, monocomponent polyester artificial filament, transportation and packaging, etc., can solve the problems of poor uniformity, inability to achieve the effect of high-tenacity polyester yarns, and high cost of employing means to obtain polymers with iv of 0.7 and above,

Inactive Publication Date: 2005-10-20
INVISTA NORTH AMERICA R L
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0008] In the context herein the term new partially oriented yarn or POY is intended to mean a yarn comprised of polyester polymer having a “textile” relative viscosity (LRV), e.g. less than or equal to 25 LRV; an elongation of about 20% to about 30% higher than the elongation of “conventional POY” made at the same spinning speed, a superior inter-filament uniformity of denier, tenacity, and elongation and a superior mechanical quality reflected by break tenacity or work to break, which are higher than that of “conventional POY”, such that the new POY can be drawn at a higher draw ratio than a “conventional POY.”

Problems solved by technology

Such LOY are known for their poor uniformity due to their inherent instability upon storage; usually a few days of aging is detrimental.
Means to obtain polymers with an IV of 0.7 and above are costly to employ and generally not available in combination with textile yarn spinning assets.
The deficiencies of prior art include the use of LOY feed yarns and an apparent need to use high IV polymer to spin conventional POY feed yarns which can be drawn sufficiently to make high tenacity yarns for sewing thread applications.
To date, the prior art has not accorded such improvements.

Method used

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  • High tenacity polyester yarns
  • High tenacity polyester yarns
  • High tenacity polyester yarns

Examples

Experimental program
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Effect test

example 1

[0036] In this example two POY samples of the invention were made. Sample A is a 34 filament and 148 denier yarn which was prepared using the apparatus and process schematically represented in FIG. 1. Sample B is a 34 filament 305 denier yarn prepared using the same apparatus and process. Both samples A and B were produced from polyethylene terephthalate polymer containing about 120 ppm chain brancher (trimethyl trimellitate). This polymer had an LRV of about 20.8. The hybrid quench portion of the apparatus of FIG. 1 had a quench delay 50 of about 5 inches (12.7 cm) and a radial quench zone of about 4 inches (10.1 cm) and a take-up roll 120 speed set to obtain an elongation at break of about 150% (in the range of 3000 to 3200 meters per minute). The properties obtained for these two invention samples of POY are shown in Table 1. Included in Table 1 are the properties of 5 comparative POY samples of the prior art which are commercially available. The invention samples, POY A and POY ...

example 2

[0037] In this example two POY samples of the invention were made. Sample C is a 34 filament and 148 denier yarn which was prepared using the apparatus and process schematically represented in FIG. 1. Sample D is a 34 filament 305 denier yarn prepared using the same apparatus and process. Both samples C and D were produced from polyethylene terephthalate polymer containing about 120 ppm chain brancher (trimethyl trimellitate). This polymer had an LRV of about 25; a higher LRV than used in Example 1. The hybrid quench portion of the apparatus of FIG. 1 had a quench delay 50 of about 5 inches (12.7 cm) and a radial quench zone of about 4 inches (10.1 cm) and a take-up roll 120 speed set to obtain an elongation at break of about 150% (in the range of 2950 to 3000 meters per minute). The properties of these two invention samples of POY obtained are shown in Table 2.

TABLE 2# ofTake-upfila-speedTBEBTBNYarnDeniermentsLRV(mpm)(g / den)(%)(g / den)Sample C1483426.830007.28152.96.02Sample D3053...

example 3

[0038] In this example the POY samples of the invention from both Examples 1 and 2 and the commercially available comparative yarns of the prior art were drawn using the apparatus and process schematically represented in FIG. 2. The drawn multifilament were prepared using a speed of 750 meters per minute for godet 140, a temperature of 80° C. for godet 135 and a temperature of 190° C. for godet 140. Shown in Table 3. are the total draw ratio, the relaxation ratio, the tenacity and elongation properties, along with the toughness factor TF for the yarns obtained.

TABLE 3TotalDrawRelaxationTenacityEBBOSYarnRatioRatio(g / den)(%)TF(%)Sample A2.450.9178.1013.820.71.3inventionComparative 12.100.9177.5314.314.40.7Comparative 22.100.9177.4812.016.11.0Comparative 32.150.9177.2613.416.71.0Sample B2.350.9007.5617.318.80.3inventionComparative 42.150.9316.8116.215.80.7Comparative 52.100.8906.9714.914.80.5Sample C2.350.9108.8115.521.81.6inventionSample D2.350.8978.2117.220.30.7invention

[0039] As b...

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Abstract

This invention relates a fully drawn high tenacity yarn and a process for making the same from a partially oriented polyester feed yarn in a drawing process comprised of two stages.

Description

CROSS-REFERENCE TO RELATED APPLICATION [0001] This application claims benefit of priority from Provisional Application No. 60 / 562,898 filed Apr. 15, 2003.BACKGROUND OF THE INVENTION [0002] 1. Field of the Invention [0003] This invention relates a fully drawn high tenacity yarn and a process for making the same from a partially oriented polyester feed yarn in a drawing process comprised of two stages. [0004] 2. Description of the Related Art [0005] One known method of producing fully drawn high tenacity polyester yarns for use as sewing threads involves drawing low orientation yarns (LOY) using a very high draw ratio. Such LOY are known for their poor uniformity due to their inherent instability upon storage; usually a few days of aging is detrimental. Another known method utilizes partially oriented yarns (POY) of the kind disclosed in U.S. Pat. No. 4,970,038 which are made from polyester polymer with an intrinsic viscosity (IV) greater than 0.7. These POY are drawn to tenacity as h...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): D01D1/00D01F6/62D02J
CPCY10T428/2913D01F6/62
Inventor FRANKFORT, HANS RUDOLF EDWARD
Owner INVISTA NORTH AMERICA R L
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