EP3943650B1 - Stretch yarns and fabrics with multiple elastic yarns - Google Patents

Stretch yarns and fabrics with multiple elastic yarns Download PDF

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Publication number
EP3943650B1
EP3943650B1 EP21191383.5A EP21191383A EP3943650B1 EP 3943650 B1 EP3943650 B1 EP 3943650B1 EP 21191383 A EP21191383 A EP 21191383A EP 3943650 B1 EP3943650 B1 EP 3943650B1
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EP
European Patent Office
Prior art keywords
elastic
fiber
yarn
fabric
core
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EP21191383.5A
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German (de)
English (en)
French (fr)
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EP3943650A1 (en
Inventor
Tianyi Liao
Raymond S. P. Leung
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Lycra Co UK Ltd
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Lycra Co UK Ltd
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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
    • D02G3/22—Yarns or threads characterised by constructional features, e.g. blending, filament/fibre
    • D02G3/38—Threads in which fibres, filaments, or yarns are wound with other yarns or filaments, e.g. wrap yarns, i.e. strands of filaments or staple fibres are wrapped by a helically wound binder yarn
    • 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
    • D02G3/22—Yarns or threads characterised by constructional features, e.g. blending, filament/fibre
    • D02G3/32—Elastic yarns or threads ; Production of plied or cored yarns, one of which is elastic
    • D02G3/324—Elastic yarns or threads ; Production of plied or cored yarns, one of which is elastic using a drawing frame
    • 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
    • D02G3/22—Yarns or threads characterised by constructional features, e.g. blending, filament/fibre
    • D02G3/32—Elastic yarns or threads ; Production of plied or cored yarns, one of which is elastic
    • D02G3/328—Elastic yarns or threads ; Production of plied or cored yarns, one of which is elastic containing elastane
    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D15/00—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used
    • D03D15/50—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used characterised by the properties of the yarns or threads
    • D03D15/56—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used characterised by the properties of the yarns or threads elastic
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/29—Coated or structually defined flake, particle, cell, strand, strand portion, rod, filament, macroscopic fiber or mass thereof
    • Y10T428/2913—Rod, strand, filament or fiber
    • Y10T428/2933—Coated or with bond, impregnation or core
    • Y10T428/2936—Wound or wrapped core or coating [i.e., spiral or helical]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T442/00—Fabric [woven, knitted, or nonwoven textile or cloth, etc.]
    • Y10T442/30—Woven fabric [i.e., woven strand or strip material]
    • Y10T442/3008—Woven fabric has an elastic quality

Definitions

  • This invention relates to the manufacture of stretch composite yarns and fabrics. It specifically relates to the fabrics and methods including two sets of elastic core fibers within one yarn.
  • Easy stretch is one important characteristic for comfort garment.
  • the fabric can be easy stretched out when garment is put on human body and move. They have low pressure exerted on the body by garment.
  • the garment can be cut to achieve a more streamlined appearance and can conform better to the body, while still maintaining comfort for wearer in motion. Such performance can be achieved through low fabric tensile modulus by minimizing the garment's resistance to the body's demands in movement.
  • a typical quality issue is that the fabric can't quickly recovery to original size and shape after fabrics are over stretched out in some parts of the body, such as in knee, butt and waist, particularly for the fabrics with high stretch level.
  • the fabric has low recovery power when the tensile modulus is low. Consumers see baggy and saggy issues after long time wear.
  • WO 2012/062480 relates to a stretch yarn comprising a stretchable core covered by an inelastic fibers sheath, the stretchable core comprises first and second fibers that have elastic properties, the first fiber is an elastomer and the second fiber is a polyester based (co)polymer.
  • US 2012/0244771 relates to composite yarns having a filamentary core provided with at least one elastic performance filament and at least one inelastic control filament.
  • a fibrous sheath preferably formed from spun staple fibers, surrounds the filamentary core.
  • the at least one elastic performance filament most preferably includes a spandex and/or lastol filament and the at least one inelastic control filament is most preferably formed of a textured polymer or copolymer of a polyamide, a polyester, a polyolefin and mixtures thereof.
  • JP 2008/297646 relates to a core-sheath composite spun yarn in which the core is a twisted yarn of a polyester type composite long fiber yarn and a polyurethane elastic fiber.
  • One aspect includes methods for making composite yarns with two sets of different elastic core fibers comprising spandex, referred to as a double elastic composite yarn, wherein at least one set of elastic core fibers is pre-covered elastic yarn. Also included are the double elastic composite yarns and the stretch fabrics and garments made from such yarns.
  • two sets of different elastic core fibers (elastic core fiber I and elastic core fiber II) and a hard fiber are covered together to form a composite yarn, wherein at least one set of elastic core fibers is pre-covered elastic yarn.
  • Another set of elastic core yarn may be bare spandex or pre-covered elastic yarn.
  • the bare spandex yarn linear density (denier) is from 11 to 560 dtex, and the hard fiber with a yarn count from 10 to 900 dtex.
  • One suitable hard yarn is cotton.
  • a fabric is made by using the double elastic yarn defined in the claims.
  • the double elastic yarn is used in at least one direction of the fabric. Any forms of fabrics may be used, including wovens, circular knits, warp knits and narrow fabrics. Further processing may include scouring, bleaching, dyeing, drying, sanforizing, singeing, de-sizing, mercerizing, and any combination of such steps.
  • the stretched fabric produced may be formed into a garment.
  • Elastomeric fibers are commonly used to provide stretch and elastic recovery in woven fabrics and garments.
  • "Elastomeric fibers” are either a continuous filament (optionally a coalesced multifilament) or a plurality of filaments, free of diluents, which have a break elongation in excess of 100% independent of any crimp.
  • An elastomeric fiber when (1) stretched to twice its length; (2) held for one minute; and (3) released, retracts to less than 1.5 times its original length within one minute of being released.
  • elastomeric fibers means at least one elastomeric fiber or filament. Such elastomeric fibers include but are not limited to rubber filament, biconstituent filament and elastoester, lastol, and spandex.
  • “Spandex” is a manufactured filament in which the filament-forming substance is a long chain synthetic polymer comprised of at least 85% by weight of segmented polyurethane.
  • “Elastoester” is a manufactured filament in which the fiber forming substance is a long chain synthetic polymer composed of at least 50% by weight of aliphatic polyether and at least 35% by weight of polyester.
  • Body filament is a continuous filament or fiber including at least two polymers adhered to each other along the length of the filament, each polymer being in a different generic class, for example, an elastomeric polyetheramide core and a polyamide sheath with lobes or wings.
  • Lastol is a fiber of cross-linked synthetic polymer, with low but significant crystallinity, composed of at least 95 percent by weight of ethylene and at least one other olefin unit. This fiber is elastic and substantially heat resistant.
  • Polymer bi-component filament means a continuous filament comprising a pair of polyesters intimately adhered to each other along the length of the fiber, so that the fiber cross section is for example a side -by-side, eccentric sheath-core or other suitable cross-section from which useful crimp can be developed.
  • the fabric made with this filament such as Elasterell-p, PTT/PET bi-component fiber, has excellent recovery characteristics.
  • No-elastomeric elastic fibers means a stretch filament without containing elastomeric fiber.
  • the recoverable stretch of such yarn must be higher than 20% as tested by ASTM D6720 methods, such as textured PPT stretch filament, textured PET stretch filament, bi-component stretch filament fiber, or PBT stretch filament.
  • a "Pre-covered elastic yarn” is one surrounded by, twisted with, or intermingled with hard yarn before the core spun process.
  • the pre-covered elastic yarn that includes elastomeric fibers and hard yarns is also termed a "pre-covered yarn” in the text of this specification.
  • the hard-yarn covering serves to protect the elastomeric fibers from abrasion during textile processes. Such abrasion can result in breaks in the elastomeric fiber with consequential process interruptions and undesired fabric non-uniformities. Further, the covering helps to stabilize the elastomeric fiber elastic behavior, so that the elongation of pre-covered elastic yarn can be more uniformly controlled during textile processes than would be possible with bare elastomeric fibers.
  • the pre-covered yarn also can increase the tensile modulus of the yarn and fabric, which is helpful to improve the fabric recovery power and dimensional stabilities.
  • the pre-covered yarns include: (a) single wrapping of the elastomer fibers with a hard yarn; (b) double wrapping of the elastomer fibers with a hard yarn; (c) continuously covering (i.e., corespun or core-spinning) an elastomer fiber with staple fibers, followed by twisting during winding; (d) intermingling and entangling elastomer and hard yarns with an air jet; and (e) twisting elastomer fibers and hard yarns together.
  • Double elastic composite yarn is a composite yarn comprising two sets of elastic core fibers with single yarn, covered with hard staple fiber sheath.
  • double elastic yarn is used interchangeably throughout the specification.
  • the stretch fabric of some embodiments includes double elastic core spun yarn in weft direction.
  • a fabric with unexpectedly high recovery properties was achieved, especially for high stretch fabrics. This was accomplished by the use of core spun yarn containing two different elastic fibers with different stretch properties.
  • the fabric may include such core spun yarn with double elastic fibers in weft direction.
  • the double elastic yarn 8 includes two elastic filament cores: elastic core I (4, in Fig. 1 ) and elastic core II (6, in Fig 1 ).
  • the elastic core filaments are surrounded, preferably along the entirety of its length by a fibrous sheath 2 comprised of spun staple fibers.
  • a representative core spinning apparatus 40 is shown in Fig. 2 .
  • Two separated fiber draft devices 46 and 64 are installed on the machine.
  • elastic core filament I 52 and elastic core filament II 66 are put on feed roll 46 and 64 separately and are combined with a hard yarn to form a composite core spun yarn.
  • the core elastic filaments from tube 48 and tube 60 are unwound in the direction of arrow 50 and 62 by the action of positively-driven feed rollers 46 and 64.
  • the feed rollers 46 and 64 serve as a cradle for the tube 48 and tube 60 and deliver the elastic fiber of yarn 52 and 66 at a pre-determined speed.
  • the hard fiber or yarn 44 is unwound from tube 54 to meet the elastic core filament 52 and 66 at the set of front rollers 42.
  • the combined elastic core filaments 52, 66 and hard fiber 44 are core spun together at spinning device 56.
  • the elastic core filament I 52 and elastic core filament II 66 are stretched (drafted) before it enters the front rollers 42.
  • the elastic filaments are stretched through the speed difference between feed rollers 46 or 64 and front rollers 42.
  • the delivery speed of the front rollers 42 is greater than the speed of the feed rollers 46 and 64. Adjusting the speed of the feed rollers 46 and 64 gives the desired draft or stretch ratio.
  • the stretch ratio is normally 1.01X times to 5.0X times (1.01X to 5.0X) compared to the un-stretched fiber. Too low a stretch ratio will result in low quality yarns having grin-through and an un-centered elastic filament. Too high a stretch ratio will result in breakage of the elastic filament and core void.
  • FIG. 3 Another representative core spinning apparatus 40 is shown in Fig. 3 .
  • Elastic core I is bare elastic filaments 52, while elastic core II 68 is pre-covered elastic yarn.
  • the elastic core II from tube 12 is unwound in the direction of arrow 62 by the action of positively-driven feed rollers 64.
  • the weighted roll 66 serves to maintain stable contact between the elastic core II and feed rollers 64 in order to deliver the elastic core II of yarn 68 at a pre-determined speed.
  • Other elements of Fig. 3 are as described for Fig. 2 .
  • FIG. 4 Another representative core spinning apparatus 40 is shown in Fig. 4 .
  • Elastic core I is bare elastic filaments 52, while elastic core II is pre-covered elastic yarn.
  • the elastic core II from tube 12 is taken off from end and then passes through a tension control device and a guide bar.
  • the tension device serves to keep the yarn tension stable at a pre-determined level.
  • the stretch ratio for bare elastic fiber is normally 1.01X times to 5.0X times (1.01X to 5.0X) compared to the un-stretched fiber.
  • Other elements of Fig. 4 are as described for Fig. 2 .
  • two elastic fibers with different properties and a hard fiber are covered together to form a composite yarn, wherein the two elastic fibers are stretched to different drafts of its original length during yarn covering process.
  • the draft of two elastic fibers can be selected between drafts 1.01X times to 5.0X times.
  • the stretch ratio of core elastic I and elastic core II could be different from each other, depending the elastic fiber performances and requirement of fabric quality. In many cases, one core is drafted more to provide high stretch performance, while another core is stretched less to provide the fabrics with low shrinkage and high recovery power.
  • the fabric may have high shrinkage, excessive fabric weight, and excessive elongation, which may result in a negative experience for the consumer. Excessive shrinkage during the fabric finish process may result in crease marks on the fabric surface during processing and household washing. Creases that develop in this manner are frequently very difficult to remove by ironing.
  • the high-temperature heat setting step in the process can be avoided.
  • This new process may reduce heat damage to certain fibers (i.e. cotton) and thus may improve the handle of the finished fabric.
  • the fabrics of some embodiments may be prepared in the absence of a heat setting step including where the fabrics will be prepared into garments.
  • heat sensitive hard yarns can be used in the new process to make shirting, elastic fabrics, thus increasing the possibilities for different and improved products.
  • the shorter process has productivity benefits to the fabric manufacturer.
  • the core spun yarn with two different elastic core fibers has higher stretch and recovery power than the core spun yarn made from single core elastic filament with the same denier.
  • the core spun yarn with two cores of 30D/3filament spandex plus 40D/4filament spandex has more recovery power than a core spun made from single core of 70D/5filament yarn under the same draft. So, we can make the core spun yarn with higher stretch and higher recovery power by using the same content of spandex.
  • Two elastic fibers with different properties could be used and are covered together with hard fiber sheath to form a composite yarn, wherein the two elastic fibers could have different polymer compositions and with different stress-strain behaviors.
  • One example is to use two spandex fibers with different heatset efficiency together within one core spun yarn, such as normal LYCRA ® spandex fiber T162C and easy set LYCRA ® fiber T562B.
  • the fabric can be heatset at the temperature higher than easy set LYCRA ® fiber heatset temperature, but lower than normal LYCRA ® fiber heatset temperature. So, the fabrics just get partial heatset which provide acceptable fabric shrinkage while good stretch and growth.
  • Another example is the core spun containing elastic core I with high tension modulus and elastic core II with low tension modulus.
  • Elastic core I provides the fabric with high recovery power and low fabric growth, while elastic core II with low modulus gives the fabric with easy stretch, lower shrinkage, resulting in the fabric with easy stretch, high holding force and high dimension stability.
  • the elastic fibers with different chemical composition also can be combined together with one core spun yarn, such as polyolefin elastic fiber Lastol and spandex (not falling within the scope of the claims). Spandex fibers offer the high recovery power while Lastol fibers contribute the good heat resistance and lower shrinkage performance.
  • the combination of elastic core I and elastic core II could be elastic bare fiber plus elastic bare fiber (not falling within the scope of the claims); or elastic bare fiber plus pre-covered elastic yarn (as defined in the claims), or pre-covered elastic yarn plus pre-covered elastic yarn (as defined in the claims).
  • the bare elastic fiber may be from about 11 dtex to about 444 dtex (denier - about 10D to about 400D), including 11 dtex to about 180 dtex (denier 10D to about 162D).
  • the pre-covered elastic yarn includes various types, such as single wrapping of the elastomer fibers with a hard yarn; double wrapping of the elastomer fibers with a hard yarn; continuously covering (i.e., core-spinning) an elastomer fiber with staple fibers, followed by twisting during winding; intermingling and entangling elastomer and hard yarns with an air jet; and twisting elastomer fibers and hard yarns together.
  • the preferred pre-covered elastic yarns are spandex airjet covered yarns with textured polyester and nylon filaments, such as 40D or 70D spandex with 50D to 150D polyester air covered yarn.
  • the pre-covered elastic yarn is made in a separated machine before the core spun yarn process.
  • the pre-covered elastic yarn can be present in any desired amount, for example from about 5 to about 35% weight percent based on total double elastic yarn weight.
  • the linear density of the pre-covered yarn ranges from about 15 denier (16.5 dtex) to about 900 denier (990 dtex), including from about 30 denier to 300 denier (33dtex to 330 dtex).
  • the ratio of yarn denier between pre-covered yarn and total double elastic yarn is lower than 35%, the fabric has no substantial grin through.
  • two elastic core fibers, including in pre-covered yarn are invisible and untouchable.
  • the linear density (denier) of bare elastic fiber may be from about 11 dtex to about 444 dtex (denier - about 10D to about 400D), including 11dtex to about 180 dtex (denier 10D to about 162D).
  • the elastic fiber is drafted between 1.1X to 6X its original length.
  • the elastic fiber is pre-covered with one or more hard yarns, with hard yarn linear density (denier) from 11dtex to 667 dtex (10 to 600 denier).
  • the no-elastomeric elastic fibers can be textured PET stretch filament, textured PPT stretch filament, bi-component fiber, or PBT stretch fiber. It was a surprise to find that when the no-elastomeric elastic fiber with recoverable stretch higher than 20% were used as one of the elastic core fibers, the performance of the core spun yarn and the fabric change dramatically. The fabrics have high stretch and high recovery power.
  • the linear density of the no-elastomeric elastic fibers can range from about 15 denier (16.5 dtex) to about 450 denier (495 dtex), including from about 30 denier to 150 denier (33dtex to 165 dtex). When the denier is too high, the fabric could have substantial grin through.
  • the elastomer fiber content with double elastic core spun yarns is between about 0.1% to about 20%, including from about 0.5% to about 15%, and about 5% to about 10% based on the weight of the yarn.
  • Elastomeric fiber content within the fabric may be from about 0.01% to about 10% by weight based on the total fabric weight, including from about 0.5% to about 5%.
  • the staple sheath fibers in the double elastic yarn can be nature fibers, such as, cotton, wool or linen. They also can be the staple man made or synthetic fibers of mono component polyethylene terephthalate) and poly(trimthylene terephthalate) fiber, polycaprolactam fiber, poly(hexamethylene adipamide) fibers acrylic fibers, modacrylic, acetate fibers, Rayon fibers, Nylon and combinations thereof.
  • Such double elastic yarns can be used for making a stretch fabric where various weave patterns can be applied, including plain, poplin, twill, oxford, dobby, sateen, satin and combinations thereof.
  • the fabrics of some embodiments may have an elongation from about 10% to about 45% in the warp or/and weft direction.
  • the fabrics may have shrinkage of about 15% or less after washing.
  • the stretch woven fabric may have an excellent cotton hand feel.
  • Garments may be prepared from the fabrics described herein.
  • the warp yarn can be the same as, or different from, the weft yarns.
  • the fabric can be weft-stretch only, or it can be bi-stretch, in which useful stretch and recovery properties are exhibited in both the warp and weft directions.
  • Air jet loom, rapier loom, projectile loom, water jet loom and shuttle loom can be used.
  • Dyeing and finishing process are important in producing a satisfactory fabric.
  • the fabric can be finished in continuous range processes and the piece dye jet processes.
  • Conventional equipment found in a continuous finishing plant and piece dye factories are usually adequate for processing.
  • the normal finishing process sequences include preparation, dyeing and finishing.
  • preparation and dyeing process including in singing, desizing, scouring, bleaching, mercerizing and dyeing, normal processing methods for elastic wovens are usually satisfactory.
  • the recoverable stretch of elastic fibers used in the Examples was measured as follows. Each yarn sample was formed into a skein of 5000 +/-5 total denier (5550 dtex) with a skein reel at a tension of about 0.1 gpd (0.09 dN/tex). The skein was conditioned at 70 °F (+/-2 °F) (21 ° +/-1 °C.) and 65% (+/-2%) relative humidity for a minimum of 16 hours. The skein was hung substantially vertically from a stand, a 6 mg/den (5.4 mg/dtex) weight (e.g.
  • the 1030 g weight was removed, and the skein was then immersed into boiling water for 10 minutes at 100 0 C degree water, after which the skein were removed from the water and conditioned as above for 16 hours.
  • This step is designed to simulate commercial fabric relaxation process, which is one way to develop the fabric stretch.
  • the length of the skein was measured as above, and its length was recorded as "C a ".
  • the 1030-gram weight was again hung from the skein, and the skein length was measured as above and recorded as "L a ".
  • Fabrics are evaluated for % elongation under a specified load (i.e., force) in the fabric stretch direction(s), which is the direction of the composite yarns ( i.e., weft, warp, or weft and warp).
  • a specified load i.e., force
  • Three samples of dimensions 60 cm ⁇ 6.5 cm were cut from the fabric. The long dimension (60 cm) corresponds to the stretch direction. The samples are partially unraveled to reduce the sample widths to 5.0 cm. The samples are then conditioned for at least 16 hours at 20°C +/- 2°C and 65% relatively humidity, +/- 2%.
  • a first benchmark was made across the width of each sample, at 6.5 cm from a sample end.
  • a second benchmark was made across the sample width at 50.0 cm from the first benchmark. The excess fabric from the second benchmark to the other end of the sample was used to form and stitch a loop into which a metal pin could be inserted. A notch was then cut into the loop so that weights could be attached to the metal pin.
  • the above fabric elongation test must be completed before the growth test. Only the stretch direction of the fabric was tested. For two-way stretch fabric both directions were tested. Three samples, each 55.0 cm ⁇ 6.0 cm, were cut from the fabric. These were different samples from those used in the elongation test. The 55.0 cm direction should correspond to the stretch direction. The samples were partially unraveled to reduce the sample widths to 5.0 cm. The samples were conditioned at temperature and humidity as in the above elongation test. Two benchmarks exactly 50 cm apart were drawn across the width of the samples.
  • % Growth L2 ⁇ 100 /L , where L2 was the increase in length between the sample benchmarks after relaxation and L was the original length between benchmarks. This % growth was measured for each sample and the results averaged to determine the growth number.
  • Fabric shrinkage was measured after laundering.
  • the fabric was first conditioned at temperature and humidity as in the elongation and growth tests. Two samples (60 cm ⁇ 60 cm) were then cut from the fabric. The samples were taken at least 15 cm away from the selvage. A box of four sides of 40 cm ⁇ 40 cm was marked on the fabric samples.
  • the samples were laundered in a washing machine with the samples and a loading fabric.
  • the total washing machine load was 2 kg of air-dried material, and not more than half the wash consisted of test samples.
  • the laundry was gently washed at a water temperature of 40°C and spun.
  • a detergent amount of 1g /l to 3 g/l was used, depending on water hardness.
  • the samples were laid on a flat surface until dry, and then they were conditioned for 16 hours at 20°C +/- 2°C and 65% relative humidity +/- 2% rh.
  • Fabric sample shrinkage was then measured in the warp and weft directions by measuring the distances between markings.
  • the warp yarn 100 % cotton open end spun yarn or ring spun was used as warp yarn.
  • denim fabrics they included two count yarns: 7.0 Ne (843.6 dtex) OE yarn and 8.5 Ne (702.98 dtex) OE yarn with irregular arrangement pattern.
  • the yarns were indigo dyed in rope form before beaming. Then, they were sized and made the weaving beam.
  • the warp yarn are 20Ne (295.25 dtex) 100% cotton ring spun yarn. They were sized and made the weaving beam.
  • Table 1 lists four examples of core spun yarn with traditional one elastic core filament and yarn containing two sets of elastic cores (not falling within the scope of the claims).
  • Each greige fabric in the examples was finished by a jiggle dye machine.
  • Each woven fabric was pre-scoured with 3.0 weight % Lubit ® 64 (Sybron Inc.) at 49°C for 10 minutes. Afterwards it was de-sized with 6.0 weight % Synthazyme ® (Dooley Chemicals. LLC Inc.) and 2.0 weight % Merpol ® LFH (E. I. DuPont Co.) for 30 minutes at 71°C and then scoured with 3.0 weight % Lubit ® 64, 0.5 weight % Merpol ® LFH and 0.5 weight % trisodium phosphate at 82°C for 30 minutes. Fabric finishing was followed by dry in a tenter frame at 160 °C for 1 minute.
  • Reference Example Yarn A Typical core spun yarn with one elastic core fiber.
  • This core spun yarn is 16Ne (369.06 dtex) with one 40D (44.44 dtex) LYCRA ® spandex fiber covered by cotton sheath.
  • the draft of the LYCRA ® fiber is 3.5X during covering process.
  • the cotton twist level TM is 18 twisters per inch. This yarn has 17.71 % recoverable stretch after boil off.
  • Reference Example Yarn B Core spun yarn with two core elastic fibers
  • the core spun yarn is 16Ne (369.06 dtex) with two sets of LYCRA ® spandex fiber covered by cotton sheath.
  • Elastic core I fiber is 20D (22.22 dtex) T162B and Elastic core II fiber is 20D (22.22 dtex) T162B as well.
  • the total denier of the elastic fibre is 40 denier (44.44 dtex).
  • the draft of the LYCRA ® fiber is 3.5X during covering process.
  • the cotton twist level TM is 18 twisters per inch. Therefore, this core spun yarn has the same structure with Example Yarn A, including in yarn count, LYCRA ® fiber denier and yarn twist level, except with 2 sets of core elastic filaments instead of one end of core spun yarn.
  • the recoverable stretch of this yarn is 20.63%, which has 2.92 unit percent higher than yarn in sample A. That means the yarn with two sets of filaments core has high recoverable stretch than the yarn with one set of filament core under the same content of spandex. In this way, the innovative yarn can provide high stretch and high recovery power for the fabrics by using the same amount of elastic fibers.
  • Reference Example Yarn C Typical core spun yarn with one elastic core fiber.
  • the core spun yarn is 16Ne (369.06 dtex) with one 70D (77.77 dtex) LYCRA ® spandex fiber covered by cotton sheath.
  • the draft of the LYCRA ® fiber is 3.8X during covering process.
  • the cotton twist level TM is 18 twisters per inch. This yarn has 38.71 % recoverable stretch after boil off and the yarn has 2.28 shrinkage.
  • the core spun yarn is 16Ne (369.06 dtex) with two sets of LYCRA ® spandex fibers covered by cotton sheath.
  • the elastic core II ffiber is 30D (33.33 dtex) T162B and elastic core I fiber is 40D (44.44 dtex) T162B.
  • the total denier of the elastic fiber is 70 denier (77.77 dtex).
  • the draft of both LYCRA ® fiber is 3.8X during covering process.
  • the cotton twist level TM is 18 twisters per inch. Therefore, this core spun yarn has the same structure with Example Yarn C, except with 2 sets of core elastic filaments instead of one set of core spun yarn.
  • the recoverable stretch of this yarn is 40.88%, which has 2.17 unit percent higher than yarn sample C. That shows that the yarn with two sets of filament core has high recoverable stretch than the yarn with one set of filament core under the same content of spandex. In this way, the innovative yarn can provide high stretch and high recovery power for the fabrics by using
  • the weft yarn was 20 Ne (295.25 dtex) cotton with 40D (44.44 dtex) Lycra ® core spun yarn. Lycra ® draft is 3.5X.
  • This weft yarn was a typical stretch yarn used in typical stretch woven khakis fabrics.
  • Loom speed was 500 picks per minute at a pick level 56 Picks per inch.
  • Table 3 summarizes the test results. The test results show that after finishing, this fabric had weight (8.95 g/m 2 ), stretch ( 37.6 %), width (128.27cm, i.e. 50.5 inch), weft wash shrinkage (0.91 %) and fabric growth (8.7%). The data indicate that this combination of stretch yarns and fabric construction caused high fabric growth.
  • This sample had the same fabric structure as in example 1. The only difference was the use of 20s weft yarn containing double core elastic fibers: 40D (44.44 dtex) LYCRA ® fiber with 3.5X draft and 40D (44.44 dtex) LYCRA ® fiber with 1.8X draft.
  • the loom speed was 500 picks/minute at 56 picks per inch.
  • Table 3 summarizes the test results. It is clearly shown that this sample has similar stretch but lower fabric growth level (6.4%). Therefore, by using two different drafts of elastic core fibers within the same yarn, the covered yarn and the fabric can achieve different characters. For example, the high draft in elastic core I fiber give the fabric with high stretch, while the lower draft in elastic core II fibers give the fabric with low growth, high recover but not increase the fabric shrinkage. In this way, the fabrics with high stretch, high recovery and low shrinkage can be produced.
  • Easyset LYCRA ® fiber can be heatset at about 170°C degree, which is about 20°C lower than the heatset temperature of T162B LYCRA ® fiber. Therefore, when the fabrics are heatset in a temperature between 170°C and 190°C, the fabric got partially heatset. Only Easyset LYCRA ® fiber is set and T162B is not set. In this way, the fabric keeps better stretch and recovery while the shrinkage keeps under certain level.
  • the warp yarn was 7.0 Ne (843.6 dtex) count and 8.4 Ne (702.98 dtex) count mixed open end yarn.
  • the warp yarn was indigo dyed before beaming.
  • the weft yarn is 16Ne (369.06 dtex) core spun yarn with 40D (44.44 dtex) T162B Lycra ® spandex and 40D (44.44 dtex) elastic polyolefin fiber.
  • the Lycra ® fiber and elastic polyester fiber were drafted 3.5X during covering process. Table 3 lists the fabric properties.
  • the fabric made from such yarns exhibited good cotton hand, good stretch (47.8%) and good recovery (6.5% growth). All test results indicate that the combination of spandex and elastic polyolefin filaments can produce good fabric stretch and growth. Fabric has no grin through. Elastic filaments can't be seen from both fabric surface and fabric back.
  • elastic polyolefin fiber or Lastol fiber has lower recovery power, but better heat resistance, better chemical resistance, low fabric shrinkage and good cotton hand touch feeling.
  • the fabrics contained with both spandex and elastic polyolefin can provide good stretch and good recovery with better heat resistance, lower shrinkage and better chemical resistance, such as chlorine resistance in swimming pool and denim bleaching processes.
  • Example 5 Stretch Fabric containing spandex and pre-covered elastic yarn
  • Example 6 Stretch fabric containing spandex and pre-covered elastic yarn
  • Example 7 Stretch denim containing spandex and pre-covered elastic yarn
  • This example had the same warp yarn and same fabric structure as Example 4.
  • the warp yarn was 7.0 Ne (843.6 dtex) count and 8.4 Ne (702.98 dtex) count mixed open end yarn.
  • the warp yarn was indigo dyed before beaming.
  • This sample is an innovation fabric.
  • Loom speed was 500 picks per minute at a pick level 44 Picks per inch. Table 3 summarizes the test results. The test results show that after washing, this fabric had weight (12.80 oz/yd 2 or 434 g/m 2 ), 35.3% weft stretch and 3.5% growth in weft.
  • Example 8 Stretch denim containing spandex and pre-covered elastic yarn
  • Example 7 had the same warp yarn and same fabric structure as Example 7, except the LYCRA ® fiber draft in pre-covered elastic yarn (2.6X draft in Example 8 vs.1.8X draft in example 7). Table 3 summarizes the test results. It is clear that this sample had good stretch (weft 40.4%) as compared with sample 7.
  • This bare 50D/26f PBT fiber has 40.23% recoverable stretch and 3.44% shrinkage tested with ASTM D6720 Method.
  • the elastic core I Lycra ® fiber was drafted 3.5X during covering process. Table 3 lists the fabric properties. The fabric made from such yarns exhibited good cotton hand, good stretch (40.7%) and good recovery (6.0% growth). All test results indicate that the combination of spandex and no-elastomeric stretch filaments can produce good fabric stretch and growth. Fabric has no grin through; elastic filaments can't be seen from both fabric surface and fabric back.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Woven Fabrics (AREA)
  • Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
  • Knitting Of Fabric (AREA)
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KR102158057B1 (ko) 2020-10-26
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EP2946032A1 (en) 2015-11-25
WO2014113207A9 (en) 2014-12-04
JP7015273B2 (ja) 2022-02-02
EP2946032B1 (en) 2022-05-18
US20150354101A1 (en) 2015-12-10
BR112015016987B1 (pt) 2022-04-19
KR20150105996A (ko) 2015-09-18
US20160362819A1 (en) 2016-12-15
JP6913436B2 (ja) 2021-08-04
BR112015016987A2 (pt) 2017-07-11
TWI649470B (zh) 2019-02-01
TW201441439A (zh) 2014-11-01
CN112410964A (zh) 2021-02-26
JP2016507669A (ja) 2016-03-10
WO2014113207A1 (en) 2014-07-24
EP3943650A1 (en) 2022-01-26
JP2019167665A (ja) 2019-10-03

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