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Fabrics of mixed-polyester-ratio bi-component fibers

a technology of polymer ratio and fibers, applied in the field of yarns comprising mixed polymer ratio bicomponent fibers, can solve problems such as non-uniform areas of fabrics, and achieve the effect of avoiding follow-the-leader crimping

Inactive Publication Date: 2006-01-12
INVISTA NORTH AMERICA R L
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0005] Accordingly, it may be desirable to develop a yarn of bi-component fibers of varying crimp frequency in order to produce a yarn that contains fibers without matching crimps, avoiding follow-the-leader crimping.

Problems solved by technology

In the subsequent production of fabric, this follow-the leader crimping can result in random filament direction reversals leading to areas of non-uniformity in the fabric.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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  • Fabrics of mixed-polyester-ratio bi-component fibers
  • Fabrics of mixed-polyester-ratio bi-component fibers

Examples

Experimental program
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Effect test

example 1

[0024] A first yarn was produced by commingling two yarns. Each yarn contained fibers of a unitary weight ratio of components for all filaments in the yarn. One yarn was a 150 denier PTT / PET yarn, which was then commingled with a 100 denier PTT / PET yarn. Each yarn was spun with 34 filaments. Thus, the resulting commingled yarn had a total of 68 filaments, with a denier per filament (dpf) of 250 divided by 68, or about 3.7. Tenacity for the commingled yarn was about 4 g / denier, with a maximum elongation of about 20%. Crimp contraction of the commingled yarn was about 60%.

example 2

[0025] A second yarn was produced in the same manner as generally described above, except that this 34 filament yarn included a mixed filament ratio from 70 / 30 to 30 / 70 weight percent of PET and PTT. The overall weight percent of PET to PTT in the yarn was about 50 / 50. The yarn was drawn 3.75×. Tenacity for the mixed filament ratio yarn was about 3.5 g / denier, with a maximum elongation of about 20% Crimp contraction was measured at about 45%.

example 3

[0026] A third yarn was produced in a manner identical to the yarn of Example 2, with the only exception that the yarn was drawn 4×. Tenacity, elongation and crimp contraction were all measured at about the same value as the yarn of Example 2.

[0027] To evaluate yarns of mixed ratios, the crimp frequency of individual filaments having varying weight ratios was charted versus applied tension as shown in FIGS. 1 and 2.

[0028]FIG. 1 shows an analysis of three filaments comprising PET and PTT. The weight ratios vary between 30 / 70, 40 / 60, and 50 / 50. Crimp frequency, measured in the number of crimps per inch, is plotted on the y-axis as measured against increasing tension from 0 to .01 g / denier, in 1 mg / denier increments. Tensions typically seen in fabrics tend to be about 2 to 4 mg / denier. Over this range, the difference in crimp frequency between the 40 / 60 and 50 / 50 versions are about 4-5%, while the difference between the 30 / 70 and 50 / 50 mixture filaments is about 16-27%.

[0029]FIG. 2...

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Abstract

Yarns of mixed ratios of bi-component fibers are disclosed, in which some filaments of a yarn produced during the spinning process are of different polymer ratios than other filaments in the same yarn. The yarns are preferably spun with the desired mixture of polymer ratios and the difference in polymer ratios are preferably at least about 10% absolute. The net overall ratio of the yarn is between about a 55 / 45 and a 75 / 25 mixture of PET / PTT by weight. Knit and woven fabrics can be prepared that include these mixed ratio yarns.

Description

[0001] This is a non-provisional of U.S. application number 60 / 585,899 filed July 7, 2004, now pending. FIELD OF THE INVENTION [0002] The invention is directed to yarn comprising mixed polymer ratio bi-component fibers and to fabrics formed therefrom. BACKGROUND OF THE INVENTION [0003] Bi-component fibers formed by melt spinning a filament from two or more polymer components have previously been disclosed in the art and are well known for use in various applications, such as fabric and apparel production, stuffing for filled articles, and the like. The bi-component fibers result from coalescing two different polymer melts before or after passing the melts through a spinneret to produce fibers. Bi-component fibers may be obtained by extrusion of at least two different polymers through the same spinneret die opening in which the two polymers have different shrinking potentials. Such bi-component fibers have a latent crimping ability which can be developed during subsequent processing ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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Application Information

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IPC IPC(8): D02G3/00
CPCD02G1/18Y10T428/2933D02G3/045
Inventor COVELLI, CARMEN A.
Owner INVISTA NORTH AMERICA R L
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