EP1956121B1 - Elastisches gesponnenes Garn aus Polyester/Baumwolle - Google Patents

Elastisches gesponnenes Garn aus Polyester/Baumwolle Download PDF

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EP1956121B1
EP1956121B1 EP08075082A EP08075082A EP1956121B1 EP 1956121 B1 EP1956121 B1 EP 1956121B1 EP 08075082 A EP08075082 A EP 08075082A EP 08075082 A EP08075082 A EP 08075082A EP 1956121 B1 EP1956121 B1 EP 1956121B1
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Prior art keywords
sample
fiber
yarn
tow
bicomponent
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French (fr)
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EP1956121A1 (de
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Geoffrey D. Hietpas
Steven W. Smith
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Invista Technologies SARL Switzerland
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Invista Technologies SARL Switzerland
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Priority claimed from US10/323,302 external-priority patent/US7036299B2/en
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    • D—TEXTILES; PAPER
    • D02—YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING
    • D02G—CRIMPING OR CURLING FIBRES, FILAMENTS, THREADS, OR YARNS; YARNS OR THREADS
    • D02G3/00—Yarns or threads, e.g. fancy yarns; Processes or apparatus for the production thereof, not otherwise provided for
    • D02G3/02—Yarns or threads characterised by the material or by the materials from which they are made
    • D02G3/04—Blended or other yarns or threads containing components made from different materials
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
    • D01F8/00—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof
    • D01F8/04—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof from synthetic polymers
    • D01F8/14—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof from synthetic polymers with at least one polyester as constituent

Definitions

  • This invention relates to spun yarn comprising polyester staple fiber and cotton, more particularly such a yarn in which the polyester staple is a bicomponent that imparts desirable properties to the yarn, and to polyester bicomponent staple fibers having selected properties, more particularly such fibers comprising poly(ethylene terephthalate) and poly(trimethylene terephthalate).
  • Polyester bicomponent fibers are known from United States Patents 3,454,460 and 3,671,375 , which disclose spun yarns made from bicomponent staple having certain ranges of crimp properties outside of which the yarns are said to be boardy, harsh, and aesthetically undesirable.
  • Spun yarns comprising bicomponent staple fibers are also disclosed in Japanese Published Patent Applications JP62-085026 , and JP2000-328382 and in United States Patents 5,723,216 and 5,874,372 , but such fibers can have little recovery power and can require mechanical crimping which adds to their cost.
  • Polyester fibers having longitudinal grooves in their surfaces are described in United States Patents 3,914,488 , 4,634,625 , 5,626,961 , and 5,736,243 , and Published International Patent Application WO01/60837 , but such fibers typically lack good stretch and recovery properties.
  • Polyester bicomponent staple fibers and cotton that have high stretch and uniformity characteristics are still needed, as are polyester bicomponent staple fibers having both improved processability and stretch and recovery properties.
  • the invention provides a bicomponent staple fiber comprising poly(ethylene terephthalate) and poly(trimethylenete) and having a tow crimp development value of 40% to 60% and a tow crimp index value of 14% to 27%, wherein the difference between the crimp index and the crimp development values is 24% to 35% absolute.
  • spun yarn comprising cotton and a bicomponent staple fiber which in turn comprises poly(ethylene terephthalate) and poly(trimethylene terephthalate) and has selected mechanical properties, has unexpectedly high stretch characteristics, cardability, and uniformity.
  • polyester bicomponent staple fiber can be made with an unexpectedly and advantageously large difference between tow crimp index and tow crimp development values, which difference is manifested in a surprising combination of good processibility as indicated by easy carding and good recovery properties as indicated by high boil-off shrinkage.
  • Such fiber is a preferred bicomponent staple fiber in the cotton/bicomponent spun yarn of the invention.
  • 'bicomponent fiber' means a fiber in which two polymers are in a side-by-side or eccentric sheath-core relationship and includes both spontaneously crimped fibers and fibers with latent spontaneous crimp that has not yet been realized.
  • “Intimate blending” means the process of gravimetrically and thoroughly mixing dissimilar fibers in an opening room (for example with a weigh-pan hopper feeder) before feeding the mixture to the card or of mixing the fibers in a dual feed chute on the card, and is to be distinguished from draw-frame blending.
  • NDR Natural draw ratio
  • the spun yarn comprises cotton and a polyester bicomponent staple fiber of the present invention comprising poly(ethylene terephthalate) ("2G-T”) and poly(trimethylene terephthalate) (“3G-T”) and has a total boil-off shrinkage (sometimes called "boil-off crimp retraction") of at least 22%.
  • Such shrinkage corresponds to about 20% elongation when a 0.045 g/den (0.04 dN/tex) load is applied to the yarn after boil-off in the yarn.
  • the total boil-off shrinkage is less than 22%, the stretch-and-recovery properties of the yarn can be inadequate.
  • the bicomponent staple fiber has a tow crimp development (“CD”) value of 40%, to 60%, and has a crimp index (“CI”) value of 14% to 27%.
  • the spun yarn When the CD is lower than about 35%, the spun yarn typically has too little total boil-off shrinkage to generate good recovery in fabrics made therefrom.
  • the CI value When the CI value is low, mechanical crimping can be necessary for satisfactory carding and spinning.
  • the CI value is high, the bicomponent staple can have too much crimp to be readily cardable, and the uniformity of the spun yarn can be inadequate.
  • the bicomponent staple fiber has a length of about 1.3 cm to about 5.5 cm.
  • the bicomponent fiber has a linear density of about 0.7 dtex per fiber, preferably about 0.9 dtex per fiber, to about 3.0 dtex per fiber, preferably to about 2.5 dtex per fiber.
  • the bicomponent staple has a linear density above about 3.0 dtex per fiber, the yarn can have a harsh hand, and it can be hard to blend with the cotton, resulting in a poorly consolidated, weak yarn.
  • it has a linear density below about 0.7 dtex per fiber, it can be difficult to card.
  • the bicomponent staple fiber is present at a level of about 20 wt%, preferably about 35 wt%, to about 65 wt%, preferably to less than 50 wt%, based on the total weight of the spun yarn.
  • the yarn of the invention comprises less than about 20 wt% polyester bicomponent, the yarn can exhibit inadequate stretch and recovery properties, as indicated by low total boil-off shrinkage.
  • the yarn comprises more than about 65 wt% bicomponent staple fiber, the uniformity of the yarns can be negatively affected.
  • the cotton is present at a level of about 35 wt% to about 80 wt%, based on total weight of the spun yarn.
  • about 1 wt% to about 30 wt%, based on total weight of the spun yarn can-be other staple fibers, for example monocomponent poly(ethylene terephthalate) staple.
  • the spun yarn has a Coefficient of Variation ("CV") of mass of no higher than about 22%, for example when determined on a spun yarn having a cotton count of 40 or lower, more preferably no higher than about 18%, for example when determined on a spun yarn having a cotton count of 20 or lower. Above those values, the yarn can become less desirable for use in some types of fabrics.
  • CV Coefficient of Variation
  • the bicomponent staple fiber can have a weight ratio of poly(ethylene terephthalate) to poly(trimethylene terephthalate) of about 30:70 to 70:30, preferably 40:60 to 60:40.
  • One or both of the polyesters comprising the bicomponent fiber can be copolyesters, and "poly(ethylene terephthalate)" and “poly(trimethylene terephthalate)” include such copolyesters within their meanings.
  • a copoly(ethylene terephthalate) can be used in which the comonomer used to make the copolyester is selected from the group consisting of linear, cyclic, and branched aliphatic dicarboxylic acids having 4-12 carbon atoms (for example butanedioic acid, pentanedioic acid, hexanedioic acid, dodecanedioic acid, and 1,4-cyclo-hexanedicarboxylic acid); aromatic dicarboxylic acids other than terephthalic acid and having 8-12 carbon atoms (for example isophthalic acid and 2,6-naphthalenedicarboxylic acid); linear, cyclic, and branched aliphatic diols having 3-8 carbon atoms (for example 1,3-propane diol, 1,2-propanediol, 1,4-butanediol, 3-methyl-1,5-pentanediol, 2,2-d
  • the comonomer can be present to the extent that it does not compromise the benefits of the invention, for example at levels of about 0.5-15 mole percent based on total polymer ingredients.
  • Isophthalic acid, pentanedioic acid, hexanedioic acid, 1,3-propane diol, and 1,4-butanediol are preferred comonomers.
  • the copolyester(s) can also be made with minor amounts of other comonomers, provided such comonomers do not have an adverse affect on the benefits of the invention.
  • Such other comonomers include 5-sodium-sulfoisophthalate, the sodium salt of 3-(2-sulfoethyl) hexanedioic acid, and dialkyl esters thereof, which can be incorporated at about 0.2-4 mole percent based on total polyester.
  • the (co)polyester(s) can also be mixed with polymeric secondary amine additives, for example poly(6,6'-imino-bishexamethylene terephthalamide) and copolyamides thereof with hexamethylenediamine, preferably phosphoric acid and phosphorous acid salts thereof.
  • polymeric secondary amine additives for example poly(6,6'-imino-bishexamethylene terephthalamide) and copolyamides thereof with hexamethylenediamine, preferably phosphoric acid and phosphorous acid salts thereof.
  • Small amounts for example about 1 to 6 milliequivalents per kg of polymer, of tri- or tetrafunctional comonomers, for example trimellitic acid (including precursors thereto) or pentaerythritol, can be incorporated for viscosity control.
  • the spun yarn of the invention comprises cotton and a bicomponent staple fiber comprising poly(ethylene terephthalate) and poly(trimethylene terephthalate) and having a plurality of longitudinal grooves in the surface thereof.
  • a bicomponent staple fiber can be considered to have a "scalloped oval" cross-section which can improve the wicking properties of the polyester bicomponent.
  • polyester bicomponent staple fibers in the spun yarn of the present invention can also comprise conventional additives such as antistats, antioxidants, antimicrobials, flameproofing agents, dyestuffs, light stabilizers, and delustrants such as titanium dioxide, provided they do not detract from the benefits of the invention.
  • conventional additives such as antistats, antioxidants, antimicrobials, flameproofing agents, dyestuffs, light stabilizers, and delustrants such as titanium dioxide, provided they do not detract from the benefits of the invention.
  • the polyester bicomponent staple fiber of the invention has a tow crimp development value of 40% to 60% and a crimp index value of 14% to 27%, wherein the difference between the crimp index and the crimp development values is 24% to 35% absolute, preferably 30% to 35% absolute.
  • the spun yarn of the invention comprise the fiber of the invention and have a tenacity-at-break of at least about 3.5 dN/tex and no higher than about 5.5 dN/tex.
  • the linear density of the spun yarn be in the range of about 100 to 700 denier (111 to 778 dtex).
  • Knit for example circular knit and flat knit
  • woven for example plainwoven and twill
  • the process to make the spun yarn of the invention comprises a step of mixing, preferably by intimate blending, cotton (which can optionally be combed) with a polyester bicomponent staple fiber having the composition and characteristics described hereinbefore, wherein the bicomponent staple fiber is present at a level of about 20 wt%, preferably about 35 wt%, and to about 65 wt%, preferably to less than 50 wt%, based on the total weight of the blended fibers.
  • the cotton is present at a level of about 35 wt% to about 80 wt%, based on total weight of the blended fibers.
  • about 1 wt% to about 30 wt%, based on total weight of the spun yarn can be other staple fibers, for example monocomponent poly(ethylene terephthalate) staple.
  • the crimps of the bicomponent fibers in the tow precursor to the staple fiber be 'de-registered', that is treated in such a way as to misalign the crimps of the fibers, and it is preferred that no attempt be made to 'de-register' them, in order to save the expense of such an unnecessary step.
  • the bicomponent staple tow does not require mechanical crimping in order for staple made therefrom to display good processibility and useful properties, and it is preferred that the tow not be subjected to a mechanical crimping step.
  • the blended fibers are further processed by carding the blended fibers to form a card sliver, drawing the card sliver, doubling and redrawing the card sliver up to 3 times, converting the drawn sliver to roving, and ring-spinning the roving, preferably with a twist multiplier of about 3 to 5.5, to form the spun yarn having a total boil-off shrinkage of at least about 22%.
  • IV Intrinsic viscosity of the polyesters was measured with a Viscotek Forced Flow Viscometer Model Y-900 at a 0.4% concentration at 19°C and according to ASTM D-4603-96 but in 50/50 wt% trifluoroacetic acid/methylene chloride instead of the prescribed 60/40 wt% phenol/1,1,2,2-tetrachloroethane. The measured viscosity was then correlated with standard viscosities in 60/40 wt% phenol/1,1,2,2-tetrachloroethane to arrive at the reported intrinsic viscosity values.
  • tow Crimp Index (“C.I.”)
  • C.I. To measure tow Crimp Index
  • a 1.1 meter sample of polyester bicomponent tow was weighed, and its denier was calculated; the tow size was typically of about 38,000 to 60,000 denier (42,000 to 66,700 dtex).
  • Two knots separated by 25 mm were tied at each end of the tow.
  • Tension was applied to the vertical sample by applying a first clamp at the inner knot of the first end and hanging a 40 mg/den (0.035 dN/tex) weight between the knots of the second end. The sample was exercised three times by lifting and slowly lowering the weight.
  • C.D To measure tow Crimp Development
  • the same procedure was carried out, except that the 1.1 meter sample was placed -- unrestrained -- in boiling water for 1 minute and allowed fully to dry before applying the 40 mg/den (0.035 dN/tex) weight.
  • C . I . and C . D . % 100 ⁇ 100 ⁇ cm - L r / 100 ⁇ cm
  • references herein to crimp values of staple fibers indicate measurements made on the tow precursors to such fibers.
  • the 'true' shrinkage of the spun yarn was measured by applying a 200mg/den (0.18 dN/tex) load, measuring the extended length, and calculating the percent difference between the before-boil-off and extended after-boil-off lengths.
  • the true shrinkage of the samples was generally less than about 5%. Since true shrinkage constitutes only a very minor fraction of total boil-off shrinkage, the latter is used herein as a reliable measure of the stretch characteristics of the spun yarns. Higher total boil-off shrinkage corresponds to desirably higher stretch.
  • the uniformity of the mass of the spun yarns along their length was determined with a Uniformity 1-B Tester (made by Zellweger Uster Corp.) and reported as Coefficient of Variation ("CV") in percentage units.
  • CV Coefficient of Variation
  • yarn was fed into the Tester at 400 yds/min (366 m/min) for 2.5 minutes, during which the mass of the yarn was measured every 8 mm.
  • the standard deviation of the resulting data was calculated, multiplied by 100, and divided by the average mass of the yarn tested to arrive at percent CV.
  • Data on conventional, commercial yarns can be found in "Uster® Statistics 2001" (Zellweger Luwa AG).
  • the cardability of the fiber blends used to make the spun yarns in the Examples was assessed with a Trutzschler Corp. staple card for which a rate of 45 pounds per hour (20 kg/hour) was considered “100% speed”. Cardability was rated “Good” if the card could be run at 100% speed with no more than 1 stop in a 40 pound (18 kg) test run, "Satisfactory” for at least 80% speed with no more than 3 stops in a run, and "Poor” if the speed was lower or the number of stops higher than for "Satisfactory". Stops were generally caused by web breaks or coiling jams.
  • the cotton was Standard Strict Low Midland Eastern Variety with an average micronaire of 4.3 (about 1.5 denier per fiber (1.7 dtex per fiber)).
  • the cotton and the polyester bicomponent staple fiber were blended by loading both into a dual feed chute feeder, which fed the Trutzschler card.
  • the resulting card sliver was 70 grain/yard (about 49,500 dtex).
  • Six ends of sliver were drawn together 6.5x in each of two passes to give 60 grain/yard (about 42,500 dtex) drawn sliver which was then converted to roving, unless otherwise noted.
  • the total draft in the roving process was 9.9x.
  • the roving was then double-creeled and ring-spun on a Saco-Lowell frame using a back draft of 1.35 and a total draft of 29 to give a 22/1 cotton count (270 dtex) spun yarn having a twist multiplier of 3.8 and 17.8 turns per inch.
  • the resulting spun yarn had a CV of 22% and a total boil-off shrinkage of 5%.
  • the fibers had substantially equal linear densities and polymer ratios of poly(ethylene terephthalate) to poly(trimethylene terephthalate). No mechanical crimp was applied to the bicomponent staple fibers in the Examples.
  • Polyester bicomponent staple fiber was made from bicomponent continuous filaments of poly(ethylene terephthalate) (Crystar® 4415-763, a registered trademark of E. I. du Pont de Nemours and Company), having an intrinsic viscosity ("IV") of 0.52 dl/g, and Sorona® brand poly(trimethylene terephthalate) (Sorona®, a registered trademark of E. I. DuPont de Nemours and Company), having an IV of 1.00, which were melt-spun through a 68-hole post-coalescing spinneret at a spin block temperature of 255-265°C.
  • the weight ratio of the polymers was 60/40 2G-T/3G-T.
  • the filaments were withdrawn from the spinneret at 450-550 m/min and quenched with crossflow air.
  • the filaments, having a 'snowman' cross-section, were drawn 4.4X, heat-treated at 170°C, interlaced, and wound up at 2100-2400 m/min.
  • the filaments had 12% CI (a value believed to be considerably depressed by the interlacing of the continuous filaments), 51 % CD, and a linear density of 2.4 dtex/filament.
  • filaments from wound packages were collected into a tow and fed into a conventional staple tow cutter, the blade spacings of which were adjusted to obtain a 1.5 inch (3.8 cm) staple length.
  • the polyester bicomponent staple fiber from Example 1 A was intimately blended with cotton to obtain various weight percents of the two fibers.
  • the blended fibers were carded, drawn, converted to roving, and ring-spun into a 22/1 yarn.
  • the resulting spun yarns had the CV and total Boil-Off Shrinkage values shown in Table 1.
  • Table 1 TABLE I Spun Yarn Staple Bicomponent, wt% Cardability Yarn_CV, % Yarn Total B.O.S., % Comp. Sample 1A 30 Good 17 18 Sample 1B 40 Good 18 24 Sample 1C 50 Satisfactory 19 34 Sample 1D 60 Satisfactory 22 36 Comp. Sample 1E 70 Poor 25 nm
  • Polyester bicomponent staple fiber was made as described in Example 1A, with the following differences.
  • the weight ratio of 2G-T/3G-T was 40/60, the spinneret had 34 holes, and the resulting filaments had a 4.9 dtex/fil linear density.
  • the Cl was 16% and the CD was 50%, but cardability with cotton at levels of 65 wt%, 40 wt%, and even 20 wt% polyester bicomponent staple was very poor, showing the unsatisfactory results obtained when the polyester bicomponent staple had high linear density.
  • Polyester bicomponent staple fiber was made substantially as described in Example 1A, except that the continuous filaments used were drawn 2.6X and had only 3% Cl and 29% CD. Cardability was good in a 60/40 polyester/cotton blend, but the boil-off shrinkage of the yarn spun from such a blend was only 15%, showing the inadequate spun yarn properties that result when CD is too low.
  • poly(ethylene terephthalate) of 0.58 IV was prepared in a continuous polymerizer from terephthalic acid and ethylene glycol in a two-step process using an antimony transesterification catalyst in the second step.
  • TiO 2 0.3 wt%, based on weight of polymer
  • Poly(trimethylene terephthalate) (1.00 IV Sorona® brand poly(trimethylene terephthalate)) was dried, melt-extruded at 258°C, and separately metered to the spinneret pack.
  • the figure shows a cross-section of the spinneret pack that was used.
  • Molten poly(ethylene terephthalate) and poly(trimethylene terephthalate) entered distribution plate 2 at holes 1 a and 1 b, were distributed radially through corresponding annular channels 3a and 3b, and first contacted each other in slot 4 in distribution plate 5.
  • the two polyesters passed through hole 6 in metering plate 7 and through counterbore 8 in spinneret plate 9, and exited the spinneret plate through capillary 10.
  • the internal diameters of hole 6 and capillary 10 were substantially the same.
  • the fibers were spun at 0.5-1.0 g/min per capillary into a radial flow of air supplied at 142 to 200 standard cubic feet per minute (4.0 to 5.6 cubic meters per minute) so that the mass ratio of air:polymer was in the range of 9:1 to 13:1.
  • the quench chamber was substantially the same as that disclosed in United States Patent 5,219,506 but used a foraminous quench gas distribution cylinder having similar sized perforations so that it provided 'constant' air flow.
  • Spin finish was applied to the fibers with a conical applicator at 0.07 wt% to 0.09 wt% based on fiber weight, and then they were wound onto packages.
  • the drawn tow was about 37,000 denier (41,200 dtex) to 65,000 denier (72,200 dtex), depending on the draw ratio. Additional spinning and drawing conditions and fiber properties are given in Table II. TABLE II Drawing: Roll Speeds, m/min Tow Sample* Spinning Speed, m/min Feed Draw 1 Draw 2 Puller Total Draw Ratio Over-Feed, %** Linear Density, dtex/fiber Tenacity dN/tex Sample 2A 1800 17.4 41.1 45.7 43.4 2.6 5 2.2 4.1 Sample 2B 1700 22.9 41.1 1 45.7 43.9 2.0 4 1.8 nm Sample 2C 1500 20.9 56.5 73.2 64.3 3.5 14 1.2 5.0 Comp.
  • Sample 2D 1500 21.3 56.5 73.2 68 3.4 8 1.3 nm Sample 2E 1500 19.7 41.1 45.7 45.7 2.3 0 1.6 3.6
  • Sample 2F 1500 26.1 58.1 73.2 64 2.8 14 1.4 4.1
  • Sample 2G 1500 26.1 58.1 73.2 67.7 2.8 8 1.4 nm Sample 2H 1500 17.4 41.1 45.7 41.4 2.6 10 1.4 4.3
  • Sample 21 1600 21.7 57.1 73.1 64.2 3.4 14 1.0 4.8
  • Sample 2J 1600 23.3 41.1 45.7 44.3 2.0 3 1.6 2.7 *Sample 2A had a 70/30 2G-T/3G-T weight ratio; all others were 60/40 2G-T/3G-T. **(Draw Roll 2 speed - Puller Roll speed) / (Puller Roll speed)
  • Example 2 Selected tow samples made in Example 2 were cut to 1.5 inches (3.8 cm), and the resulting bicomponent staple samples were intimately blended with cotton, carded, and ring spun at a 60/40 polyester/cofton weight ratio to make 22/1 cotton count spun yarns. Fiber properties, cardability when blended with cotton, and properties of the resulting spun yarns are given in Table III. TABLE III Bicomponent Staple From: Tow C.I. % Cardability Tow C.D. % Spun Yarn Sample Yarn B.O.S. % Yarn CV, % Comp. Sample 2J 9 Good 26 Comp.
  • Sample 3A 20 15 Sample 2B 16 Good 35 Sample 3B 24 19 Sample 2A 28 Satisfactory 49 Sample 3C 34 20 Sample 2H 34 Satisfactory 53 Sample 3D 39 19 Sample 2E 36 Satisfactory 53 Sample 3E 38 22 Interpolation and extrapolation of the data in Table III show that when Cl is below about 14%, boil-off shrinkage can be inadequate, and that when Cl is as high as about 42%, cardability can remain satisfactory.
  • Bicomponent staple cut to 3.8 cm from tow Sample 2B was blended with cotton at a polyester bicomponent/cotton weight ratio of 60/40, and the blend was carded and drawn as described hereinabove, but without making a roving.
  • the drawn sliver was air-jet spun into 22/1 yarn on a Murata 802H spinning frame at an air nozzle pressure ratio (N1/N2) of 2.5/5.0, a total draft of 160, and a take-up speed of 200 meters/min.
  • the total boil-off shrinkage of the yarn was only 14%, showing that air-jet spun yarn had unsatisfactory stretch and recovery.
  • Example 2 Selected tow samples made in Example 2 were cut to 1.5 inches (3.8 cm), and the resulting bicomponent staple samples were intimately blended with cotton, carded, and ring-spun at 60/40 and 40/60 polyester/cotton weight ratios to make 22/1 cotton count spun yarns. Fiber properties, cardability of the fiber blends, and properties of the resulting spun yarns are given in Table IV.
  • Women's 3x1 quarter socks with a 1 ⁇ 2 cushion foot were knit on a ing only spun yarns from Example 1. Each sock was bleached with aqueous hydrogen peroxide at 180°F (82°C) and boarded at 250°F (121°C) for 1.5 minutes with dry heat.
  • the unload power of the socks was determined as follows. To avoid edge effects, the sock was not cut. It was marked with a 2.5 inch x 2.5 inch (6.4 cm x 6.4 cm) square, centered on the foot, between the toe and heel. The grips of an Instron tensile tester were placed at the sock foot top and bottom, avoiding the heel and toe and leaving the centered square between the grips so that the test sample had a 2.5 inch (6.4 cm) gauge. Each sample was cycled 3 times to 50% elongation at a speed of 200% elongation per minute. The unload force was measured at 30% remaining available stretch on the 3 rd cycle relaxation and reported in kilograms force and is reported in Table V.
  • a 3/1 twill fabric was made on an air jet loom with a warp of 100% ring-spun cotton of 40/1 cotton count, reeded to 96 ends/inch (38 ends/cm).
  • the filling yarn consisted of a 22/1 cotton count ring-spun yarn of 40 wt% cotton and 60 wt% of bicomponent staple cut to 3.8 cm from tow Sample 2H, inserted at 65 picks per inch (251 ⁇ 2 picks per cm) and 500 picks/minute.
  • the fabric was scoured for an hour at the boil and conventionally dyed with direct and disperse dyes. The available stretch was 21 %, and the growth was 3.8%, both desirable properties.
  • Example 6A was repeated but with a spun yarn of bicomponent staple cut to 3.8 cm from tow Sample 2E, ring-spun at the same blend ratio with cotton, inserted at 45 picks per inch (18 picks/cm).
  • the fabric was scoured for hour at the boil and conventionally dyed with direct and disperse dyes.
  • the available stretch was desirably high at 25%, and the growth was desirably low at 4.6%.
  • poly(trimethylene terephthalate) (Sorona® 1.00 IV) was extruded at a maximum temperature of about 260°C and poly(ethylene terephthalate) ('conventional', semi-dull, Fiber Grade 211 from Intercontinental Polymers, Inc., 0.54 dl/g IV) was extruded at a maximum temperature of 285°C, and the two polymers were separately metered to a spinneret pack like that of Figure 1 except that metering plate 7 was absent. The spinneret pack was heated to 280°C and had 2622 capillaries.
  • the 2G-T was present at 52 wt%, and the 3G-T was present at 48 wt% and had an IV of 0.94 dl/g. Fibers were collected from multiple spinning positions by puller rolls operating at 1200-1500 m/min and piddled into cans.
  • Tow from about 50 cans was combined, passed around a feed roll to a first draw roll operated at less than 35°C, through a steam chest operated at 80°C, and then to a second draw roll.
  • the first draw was about 80% of the total draw applied to the fibers.
  • the drawn tow was about 800,000 denier (888,900 dtex) to 1,000,000 denier (1,111,100 dtex).
  • drawn tow 16 was heat-treated by contact with rolls 11 operated at 110°C, by rolls 12 at 140°-160°C, and by rolls 13 at 170°C.
  • the ratio of roll speeds between rolls 11 and 12 was about 0.91 to 0.99 (relaxation), between rolls 12 and 13 it was about 0.93 to 0.99 (relaxation), and between rolls 13 and 14 it was about 0.88 to 1.03.
  • Finish spray 15 was applied so that the amount of finish on the tow was 0.15 to 0.35 wt%.
  • Puller/cooler rolls 14 were operated at 35-40°C.
  • the tow was then passed through a continuous, forced convection dryer operating at below 35°C and collected into boxes under substantially no tension. Additional processing conditions and fiber properties are given in Table VI.
  • Tow Samples 7B, 7C, and 7E were cut to 1.75 inch (4.4 cm) staple, combined with cotton by intimate blending, carded on a J.D. Hollingsworth card at 60 pounds (27 kg) per hour, and ring-spun to make yarns of various cotton counts.
  • the yarns and their properties are described in Table VII; cardability was estimated on a qualitative basis.
  • TABLE VII Bicomponent Staple Spun Yarn Sample Cardability Spun Yarn Cotton Count (Ne c ) From Tow Sample No.
  • the yarns produced in the examples and fabrics made therefrom in accordance with the invention were soft and aesthetically pleasing.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)

Claims (2)

  1. Bikomponentenstapelfaser, umfassend Poly(ethylenterephthalat) und Poly(trimethylenterephthalat) mit einem Spinnkabelkräuselentwicklungswert von 40% bis 60% und einem Spinnkabelkräuselungsindexwert von 14% bis 27%, wobei die Differenz zwischen dem Kräuselungsindex- und dem Kräuselentwicklungswert absolut genommen 24% bis 35% beträgt.
  2. Bikomponentenstapelfaser nach Anspruch 1, wobei die Differenz zwischen dem Kräuselungsindex- und dem Kräuselentwicklungswert absolut genommen 30% bis 35% beträgt.
EP08075082A 2001-12-21 2002-12-20 Elastisches gesponnenes Garn aus Polyester/Baumwolle Expired - Lifetime EP1956121B1 (de)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US10/029,575 US20030136099A1 (en) 2001-12-21 2001-12-21 Stretch polyester/cotton spun yarn
US10/286,683 US20030131578A1 (en) 2001-12-21 2002-11-01 Stretch polyester/cotton spun yarn
US10/323,302 US7036299B2 (en) 2001-12-21 2002-12-19 Stretch polyster/cotton spun yarn
EP02798572A EP1456442B1 (de) 2001-12-21 2002-12-20 Elastisches gesponnenes garn aus polyester/baumwolle

Related Parent Applications (2)

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EP02798572A Division EP1456442B1 (de) 2001-12-21 2002-12-20 Elastisches gesponnenes garn aus polyester/baumwolle
EP02798572.0 Division 2002-12-20

Publications (2)

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EP1956121A1 EP1956121A1 (de) 2008-08-13
EP1956121B1 true EP1956121B1 (de) 2010-06-16

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US7036299B2 (en) * 2001-12-21 2006-05-02 Invista North America S.A.R.L. Stretch polyster/cotton spun yarn
KR100686299B1 (ko) * 2003-01-08 2007-02-26 솔로텍스 가부시끼가이샤 재봉사 및 직물 봉제품
US7310932B2 (en) * 2005-02-11 2007-12-25 Invista North America S.A.R.L. Stretch woven fabrics
EP2550384B1 (de) * 2010-10-04 2015-11-25 Sanko Tekstil Isletmeleri San. Ve Tic. A.S. Weicher baumwolldrillichstoff mit glatter berührungsoberfläche, brillanter farbe und falten nach art von seiden- oder viskosestoffen sowie herstellungsverfahren dafür
CN102493065A (zh) * 2011-12-19 2012-06-13 上海申安纺织有限公司 一种再生棉雪花混纺纱及其混纺工艺
CN111979621B (zh) * 2020-08-07 2022-08-19 舞钢市龙山纺织科技有限公司 一种高档米通纱的制备方法

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US7036299B2 (en) * 2001-12-21 2006-05-02 Invista North America S.A.R.L. Stretch polyster/cotton spun yarn

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HK1074860A1 (en) 2005-11-25
US20030136099A1 (en) 2003-07-24
EP1956121A1 (de) 2008-08-13
US20030131578A1 (en) 2003-07-17
DE60236770D1 (de) 2010-07-29

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