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Slivers containing cellulose acetate for spun yarns

Pending Publication Date: 2021-04-29
EASTMAN CHEM CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The invention relates to a carded sliver made of round shape, low denier, and crimped CH staple fibers, which has a high fiber-to-fiber cohesion energy of at least 10,000 joules. The invention also includes a spun yarn made from this carded sliver, which has a low amount of spin finish or no spin finish. The resulting textile fabric made from the spun yarn has no or less spin finish and contains uncrimped CH staple fibers with a round shape, low denier, and crimp frequency per inch. The CH staple fibers have an untwisted fiber to fiber coefficient of dynamic friction (F / F CODF) between 0.11 to less than 0.2 and a static electricity charge of less than 1.0 at 65% relative humidity.

Problems solved by technology

Even if the material of choice meets end use performance requirements, it is not likely to be adopted into a textile fabric market if it cannot be processed on existing equipment used to make spun yarn.
Fibers having a low denier are better suited to achieve a softer feel, however, low denier fibers are more difficult to process.
However, as the denier drops below 3, the application of crimp can weaken the tenacity of the fiber to a point where the fibers easily break, forming a dust like lint that results in both fiber loss and frequent shut down of machinery to clean out rapidly accumulating lint.

Method used

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  • Slivers containing cellulose acetate for spun yarns

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0134]The feasibility of successfully making a 100% cellulose acetate spun yarn from low denier, high CPI, round CA staple fibers was explored. A successful trial of making a sliver and spun yarn from 100% CA staple fiber is predictive of the influence such fibers would have in a blended sliver.

[0135]CA staple fiber tow bundles were produced having a round cross section of 1.8 denier fiber, 17CPI, and coated with Pulcra Stantex 2098 finish in an amount of 0.5% FOY. A 100 pound sample of the tow bundle was collected and cut to a 38 mm stretched staple length with 0.5% FOY PM lubricant commercialized by Eastman as PM 30419 added just prior to cutting. The yarn spinning conditions were maintained at ˜55% humidity during the experiment. The staple fibers were subjected to carding, drawing, roving, and ring spinning.

[0136]For an initial proof of concept, the staple fibers successfully spun into six 2 pound packages of 20 singles (˜250 denier) yarn at 4.2 twist multiple. However, this res...

example 2

[0137]In this example, the effect of CPI, shape, and finishes on the staple fiber's carding and spinning performance were evaluated. The variables explored were 8, 12 and 18 CPI, while the fiber shapes explored were round and trilobal and the two secondary spin finishes compared were PM 30149 and Pulcra Tow (E8-0.5%), and Stantex H1385 available from Pulcra, as summarized in Table 1. The primary spin finish was applied to the fibers after extrusion, prior to crimping, and the secondary spin finish was applied to the tow band prior to cutting. The amount of primary and secondary finishes is set forth in Table 1. The staple fibers had a cut length of 38 mm and a denier of 1.8.

TABLE 1CrimpCrossPrimary SpinSecondary SpinLevel (cpi)SectionFinishFinishSample 18TrilobalTow (E8 - 0.5%)AY23Sample 212TrilobalTow (E4.7 - 0.5%)AY23Sample 318RoundPulcra (StantexAY232098 0.65%)Sample 418TrilobalPulcra (StantexAY232098 0.65%))Sample 518TrilobalPulcra (StantexStantex H13852098 0.65%))Sample 618Roun...

example 3

[0140]This example demonstrates the successful spinning of a yarn using the CA staple fibers of the invention alone and blended with other fiber materials.

[0141]The CA staple fibers and all other synthetic staple fibers had a denier of about 1.5 and cut to a 38 mm staple length. For cotton, upland cotton was used. The synthetic fibers were blended intimately while the acetate / cotton blending was done on a draw frame.

[0142]For the 100% acetate spun yarns, a round 1.65 DPF bright tow (no TiO2), 16 CPI fiber tow band was made with a 0.7% AY23 as the primary spin finish. The fibers from this tow band were used to make the samples set forth in Table 2 to produce 29 / 1 spun yarns. The tow sample was cut using either AY23 or Lurol 7414K as the secondary spin finish targeting 1.5% each respectively. The cut length of the staple fibers were 38 mm. The break factor was determined by the count strength product as a function of skein strength and yarn count and according to ASTM D1576.

[0143]ASTM...

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Abstract

Sliver containing cellulose acetate staple fibres is obtained that exhibits good fibre to fibre cohesion energy and can be successfully drawn and made into spun yarns. Such slivers can be made of cellulose acetate staple fibres that have of round shape, a denier of less than 3.0, a crimp frequency per inch (CPI) from 5 to 30, a good fibre to fibre coefficient of friction and have a low static charge. The textile fabrics made from spun yarns have plant-based renewable resources by containing the cellulose acetate staple fibres, and can exhibit a thermoplastic behaviour to impart better dimensional stability to a textile fabric. The low denier of the cellulose acetate fibres can impart a feel similar to that of cotton, yet can be successfully processed through carding machines to form cohesive slivers and retain their integrity throughout the drawing process, allowing them to be formed into spun yarns.

Description

FIELD OF THE INVENTION[0001]This invention relates to slivers containing cellulose acetate staple fibers to make rovings and spun yarns for textile fabrics, and more particularly, to slivers having good fiber-to-fiber cohesion energy.BACKGROUND[0002]Textile fabrics consisting of spun yarns are widely used in a variety of applications. These fabrics are formed by weaving, knitting, crocheting, knotting, or felting yarn made of natural and / or synthetic materials, such as, for example, polyesters, polyamides, acrylics, polyurethanes, glass, wool, polypropylene, silk, cashmere, sisal, flax, hemp, cotton, a variety of regenerated cellulosic materials, such as viscose, Modal, and Lyocell, and is often formed as a blend of two or more of these materials.[0003]While the use of regenerated cellulosic materials has the advantage of originating from plant based renewable resources (cellulose), they do no exhibit thermoplastic behavior. Typically, textile fabrics containing regenerated cellulos...

Claims

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Application Information

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IPC IPC(8): D02G3/02D02G3/22
CPCD02G3/02D10B2201/28D02G3/22
Inventor KELLY, KELMARA KHADENERODICK, EVAN V.SMITH, CHAD C.SNELL, RONALD A.
Owner EASTMAN CHEM CO