US3577873A - Novel core yarns and methods for their manufacture - Google Patents

Novel core yarns and methods for their manufacture Download PDF

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Publication number
US3577873A
US3577873A US805598A US3577873DA US3577873A US 3577873 A US3577873 A US 3577873A US 805598 A US805598 A US 805598A US 3577873D A US3577873D A US 3577873DA US 3577873 A US3577873 A US 3577873A
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yarn
core
filaments
filamentary components
components
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US805598A
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G T Waters
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Imperial Chemical Industries Ltd
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Imperial Chemical Industries 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
    • D02G3/36—Cored or coated yarns or threads
    • 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
    • D02G1/00—Producing crimped or curled fibres, filaments, yarns, or threads, giving them latent characteristics
    • D02G1/02—Producing crimped or curled fibres, filaments, yarns, or threads, giving them latent characteristics by twisting, fixing the twist and backtwisting, i.e. by imparting false twist
    • D02G1/0206—Producing crimped or curled fibres, filaments, yarns, or threads, giving them latent characteristics by twisting, fixing the twist and backtwisting, i.e. by imparting false twist by false-twisting
    • D02G1/024—Producing crimped or curled fibres, filaments, yarns, or threads, giving them latent characteristics by twisting, fixing the twist and backtwisting, i.e. by imparting false twist by false-twisting with provision for imparting irregular effects to the 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
    • D02G3/26—Yarns or threads characterised by constructional features, e.g. blending, filament/fibre with characteristics dependent on the amount or direction of twist
    • D02G3/28—Doubled, plied, or cabled threads
    • D02G3/286—Doubled, plied, or cabled threads with alternatively "S" and "Z" direction of twist, e.g. Self-twist process

Definitions

  • Core yarns may be produced in several ways, the main ones of which are that of core spinning, in which a core component is introduced into a wrapping component during the drafting or spinning process, and core texturing, in which the two (or more) components are fed together but under different tensions and/or rates to a texturing device, such as an air jet.
  • core spinning in which a core component is introduced into a wrapping component during the drafting or spinning process
  • core texturing in which the two (or more) components are fed together but under different tensions and/or rates to a texturing device, such as an air jet.
  • Core yarns provide the possibility of achieving surface effects in fabrics equivalent to those of the wrapping component, whilst the extension characteristics of the yarn during and after fabrication are determined by those of the core component. In this way, bulky or nubby surface effects can be achieved with yarns which are more tension stable (i.e., withstanding the tensions inherent in fabrication, e.g., by weaving, and in wear, when the fabric is utilized inclothing) than would be the case were the entire yarn to be made as the wrapping component is made.
  • a novel core yarn comprising a core component of set false twisted synthetic continuous filaments and at least one wrapping component of synthetic continuous filaments formed in helices around the core component, the direction of which helices reverses at intervals along the yarn.
  • At least 95 percent by number of the intervals between helix reversals along the yarn are of length less than 2 cm. and at least 50 percent by number of the intervals between helix reversals along the yarn'are at length less than 0.5 cm.
  • the wrapping component of reversing helices may be continuously wrapped around the core component.
  • the wrapping component of reversing helices may be only intermittently wrapped around the core'component.
  • the nature and thickness of the synthetic filaments of the wrapping component or components are such as to cause the helices of that component(s) to stand out proud of the core component, and to provide the surface texture which, after fabrication, simulates that of a fancy doubled yam, despite the presence of the reversals of helix direction to be contrasted with the unidirectional helix of a doubled yarn. Indeed, the uniformity of the surface texture with our core yarns of low order is dependent on the reversals of helix direction occuring at frequent intervals along the yarn.
  • the low order core yarns are fluffier than the high order ones, and, despite the intermittency of the wrapping, they are a well-integrated filamentary body.
  • Both the low and the high order composite, core yarns referred to in this specification have the altemating-direction helices of the wrapping component formed with a substantialiy constant radius of the helix.
  • the core yarn of the invention can be homogeneous in the sense of the core and wrapping components being made of filaments of the same synthetic fibers, as for instance, polyhexamethylene adipamide (nylon 66) or polyethylene terephthalate.
  • this is not essential; and dye variations and other effects may be better obtained if the components or filamentsdifr'er in respect of chemical character, or at least the wrapping components differ when there are more than one of them.
  • Filaments may be all of circular cross section; or some,
  • wrapping component(s) may be of noncircular cross section, e.g., trilobal.
  • the core yarn of the invention exhibits no sharply defined yield point under load at a constant rate of extension and can be regarded as being sufficiently tension stable for weaving into woven fabric in which the textured effect of the helical wrapping component or components is adequately maintained.
  • a core yarn comprising a core component of 30 denier/l0 filament nylon 66 wrapped with a wrapping component of 20 denier/2 filament nylon 66 maintains approximately similar helical spacing of the wrapping component on the core at loads between 0.1 gram/denier and 1.0 gram/denier. in fact, the textured effect appears to be slightly enhanced by tensioning within this range.
  • the core yarn of the invention owing to its false-twisted components, possesses torque; and hence it may be desirable for two such yarns of opposite torque to be doubled to balance the torques, or for a single such yarn to be submitted to a subsequent heat treatment to cause the decay of the torque, in order that the yarn may be readily usable for knitting or weavmg.
  • a process for making a core yarn comprising supplying at least two synthetic continuous filamentary components to in sequence a feed means, a heating zone and a false twisting element and withdrawing said filamentary components from said sequence under a higher tension than that under which the said components were supplied to said sequence the filamentary components differing as to their extensibility under the stresses on entering the yarn section of increasingtwist gradient.
  • a feed means we include a positive feed system such as a nip roll or feed roll assembly and a free feed system such as a tensioning device.
  • the filamentary components may be supplied to separate feed means.
  • the false twisting is combined with drawing, in order that the difference between the extensibilities of the filamentary components may be large.
  • Natural draw ratio is defined as the ratio of the cross-sectional areas of the yarn immediately on opposite sides of the neck (or localized draw point) at which the yarn draws, Natural draw ratio" is thus a characteristic of the yarn, not of the machine to which the mechanical draw ratio is applied, such latter ratio being the'ratio of the linear speeds at which the yarn is supplied to and withdrawn from the zone in which drawing occurs.
  • the undrawn filamentary components with differing natural draw ratios or differing spun birefringences either by spinning them from differing polymer feed stocks, or by using a common polymer feed stock and varying spinning parameters such as the wind-up speed on the spinning machine or the size of holes in the spinnerets or the temperature thereof.
  • Such varying extensibility of filaments can be usefully achieved by varying the spun birefringence of the filaments that are combined to form the feed yarn, such filaments being of homogeneous polymeric feed stock.
  • polymeric material for extrusion into filaments by melt-spinning can be split into two or more fractions prior to extrusion, and the required differential potential can be provided for by treating the fractions differently in regard to their extrusion conditions.
  • One such method involves the injection of a degradent for the polymer into one or more of the stream fractions within the spinning pack.
  • the variability can be achieved by employing filaments of different materials which differ in regard to this characteristic.
  • Core yarns according to the invention may be processed from such heterogeneous filament bundles concurrently with their production, or as a separate step following on after the preparation of the heterogeneous filament bundles and their supply in the form, for instance, of wound packages of undrawn filaments.
  • the said core yarns may be made, we employ undrawn filamentary components of the same or differing birefringence values, and positively feed them at the same or differing speeds to a false twisting device and withdraw them therefrom under a tension, such that drawing has occurred in the yarn section of increasing twist gradient and the several components are submitted to differing heat treatments prior to drawing taking place.
  • differing heat treatments can be imparted by contacting the filamentary components with a heated surface or surfaces having portions at different temperatures, as for instance with a heated feed roll having portions of its peripheral surface heated from internally, e.g., by electric resistance heaters, at different temperatures.
  • This method of making the said core yarns is especially adapted to the invention when to be carried out with filamentary components of polyester material, as for instance polyethylene terephthalate filaments.
  • the temperature of portions of a heated feed roll, or of a plurality of heated feed rolls can differ in the range between, say, 80 C. and 95 C.
  • the synthetic filaments of the wrapping components may, or may not, be completely drawn, although it is preferred that they should be.
  • the filaments of the core component will, however, be at least substantially fully drawn.
  • the filaments may also be of different deniers, having been extruded through spinneret holes of different sizes in one or more groups of the spinneret.
  • the false twist crimping machine has twisting elements of the friction type, by which the false twist is inserted by the direct action of rotating annular friction means on the yarns.
  • Such limited degree of heating on the run may be provided by contact with a heated surface, e.g., a roll or a curved plate. In certain circumstances, if desired, the draw roll may be heated to serve for this purpose. Alternatively, the limited degree of heating on the run may be provided by passage of the composite, core yarn through a heated fluid, such as steam in a steaming tube or a jet.
  • a heated fluid such as steam in a steaming tube or a jet.
  • Heating on the wind-up package may likewise be in steam, in a dry heat atmosphere or in a heated dyebath.
  • the composite, core yarn may be heat treated while under a controlled tension and temperature depending on the nature of the bulkiness desired.
  • FIG. 1 is a schematic representation of a core yam of high order according to the present invention.
  • FIG. 2 is a schematic representation of a core yarn of low order according to the present invention.
  • FIG. 3 is a diagrammatic representation of one embodiment of the process of the invention.
  • FIG. 1 there is shown a core yarn of high order having a core component 1 and a wrapping component 3 composed of individual filaments 5 formed in helices and continuously wrapped around said core component.
  • the direction of the helix of each filament 5 around the core reverses at points 7 and 9.
  • the length of the interval between helix reversals 7 and 9 is denoted by 1.
  • FIG. 2 there is shown a core yarn of low order having a core component I and a wrapping component 3 composed of individual filaments 5 formed in helices and intermittently wrapped around said core component. Reversals of helix direction of individual filaments are shown at points 11 and 13.
  • Undrawn yarns l5 and 17, of differing birefringence values are withdrawn from supply packages 16 and 18 by feed roll assembly 21, comprising .a feed roll 23, a separator roll 25, and a nip roll 26, the undrawn yarns having been brought together at thread guide 19.
  • feed roll assembly comprising a feed roll 23, a separator roll 25, and a nip roll 26, the undrawn yarns having been brought together at thread guide 19.
  • the yarns pass to a false twisting and drawing stage comprising a heater plate 27, a friction twisting element 29 and a draw roll assembly 31 comprising a draw roll 33 and a separator roll 35.
  • the yarns enter a section of increasing twist gradient due to the insertion of twist into the yarns by friction twisting element 29.
  • the twist gradient reaches a maximum value on the heater plate 27.
  • the draw roll is rotated at a given higher speed compared with the feed roll and drawing takes place on the heater plate 27.
  • the yarns are subjected to stresses on entering the yarn section of increasing twist gradient due to the higher speed of the draw roll 33 compared with the feed roll 23 and the insertion of twist by friction twisting element 29. Since the yarns have differing birefringence values they differ as to their extensibilities under the stresses on entering the yarn section of increasing twist gradient. In this section, that is, upstream of twisting element 29, the component of greater extensibility fomts a unidirectional helix of substantially constant radius around the other component which is a twisted yarn in which filament migration occurs.
  • the core yarn produced Downstream of twist element 29, the core yarn produced has a set false twisted core and a wrapping component of alternating helix direction. From the draw roll assembly the core yarn passes to a heater plate 37 and thence to a relax roll assembly 39 comprising a relax roll 41 and a separator roll 43.
  • the extent of relaxation achieved is governed by the temperature of heater plate 37 and the speed at which relax roll 41 is operated compared with draw roll 33. Increasing overfeed across the relax heater plate 37, that is decreasing the speed of relax roll 41 compared with the speed of draw roll 33, increases the order of the core yarn produced. Increasing the temperature of heater plate 37, decreases the order of the core yarn produced. From the relax roll assembly 39, the core yarn is passed to a conventional wind-up assembly (not shown) for orderly collection.
  • EXAMPLE 1 The core component comprised 84 denier/l0 filament undrawn poly(hexamethylene adipamide) yarn of natural draw ratio 2.8 and the wrapping component comprised 75 denier/2 filament undrawn poly(hexarnethylene adipamide) yarn of natural draw ratio 3.8.
  • the two undrawn yarn components were fed together by the feed roll of a positive-feed friction false twisting machine, the takeout (draw) roll of which was rotated at a given higher speed compared with the feed roll such as to draw the yarn components together whilst they were being false twisted, drawing occuring an inch or two along the length of a 2-foot long heater plate, maintained at 220 C. and positioned between the feed roll and the annular false twisting device.
  • the linear speed of the composite yarn at the draw roll was 1,000 feet/minute and the draw ratio 2.57.
  • the ratio of twisting device r.p.m. to throughput speed in feet/minute of the composite cored yarn was 9.
  • the tension of the yarn within the yarn length of increasing twist gradient was 30g.
  • the tension of the yarn on withdrawing from the false twisting device was 46g.
  • the core yarn so produced was of a high order.
  • the wrapping component was formed in helices around the core component, the direction of which helices reversed at intervals along the yarn. At least 95 percent and 50 percent by number of the intervals between helix reversals along the yarn were of length less than 0.7 cm. and 0.3 cm. respectively.
  • EXAMPLE 2 An example of a low-ordered core yarn according to the invention comprises a polyamide yarn of heterogeneous filaments processed according to the following conditions:
  • the undrawn yarn was 210 denier/20 filaments melt spun from a spinneret containing two groups of holes each. Through one such group standard filaments of polyhexamethylene adipamide were extruded such that the 10 filaments had a total denier of 90 and a natural draw ratio of 3.
  • the conditions of drawing and false twisting according to this example were Linear speed of yarn at draw roll feet/min. 1, 500 Heater length feet 2 Heater temperature 220 C Draw ratio 2. 71 S/V ratio 11 (where S is the r.p.m. of the twisting device and V is the speed of the yarn in feet/minute).
  • the tension of the yarn within the yarn length of increasing twist gradient was 40g.
  • the tension of the yarn on withdrawing from the false twisting device was 70g..
  • EXAMPLE 3 The core component comprised 96 denier/l0 filament 'undrawn poly (ethylene terephthalate) yarn of spun birefringence value 8X10; and the wrapping component comprised 96 denier/2 filament undrawn poly(ethylene terephthalate) yarn of spun birefringence value 5X10.
  • the two component undrawn yarns were fed together by the feed roll of a positive-feed friction false twisting machine, the takeout (draw) roll of which was rotated at a given higher speed compared with the feed roll suchas to draw the com ponent yarns together whilst they were being false twisted, drawing occuring an inch or two along the length of a 2-foot long heater plate, positioned between the feed roll and the annular false twisting device, which plate was maintained at 187 C.
  • the linear speed of the composite yarn at the draw roll was 1,000 feet/minute and the draw ratio 3.00.
  • the ratio of twisting device r.p.m. to throughput speed in feet/minute of the composite, cored yarn V) was 9.
  • the bulked, cored yarn so produced was of a high order.
  • EXAMPLE 4 The core component comprised 96 denier/l0 filament undrawn poly(ethylene terephthalate) yarn of spun birefringence value 8X10 and the wrapping component comprised 96 denier/l0 filament undrawn poly(ethylene terephthalate) yarn of spun birefringence value 5X10. 1
  • the two undrawn yarn components were fed together by the feed roll of a positive-feed friction false twisting machine, the draw roll of which was rotated at a given higher speed compared with the feed roll such as to draw the yarn components together whilst they were being false twisted, drawing occuring an inch or two along the length of an l8-inch long heater plate, maintained at 210 C. and positioned between the feed roll and the annular false twisting element.
  • the linear speed of the composite yarn at the draw roll was 1,500 feet/minute and the draw ratio 2.80.
  • the ratio of twisting element r.p.m. to throughput speed at the draw roll in feet/minute of the core yarn was 9.5.
  • the yarn was then fed along an 18-inch long heater plate, maintained at 240 C., to a relax roll, the ratio of the draw roll speed: the relax roll speed being 1.0435:l.
  • the yarn so produced was a core yarn of low order.
  • the yarn so produced was a core yarn of higher order than that produced previously.
  • the two component yarns when still in undrawn state, were fed together by the feed roll of a positive-feed friction false twisting machine, the takeout (draw) roll of which was rotated at a given higher speed compared with the feed roll such as to draw the component yarns together whilst they were being false twisted, drawing occurring an inch or two along the length of a 2-foot long heater plate positioned between the feed roll and the annular false twisting device, which plate was maintained at 210 C.
  • the feed roll was of stepped form, providing peripheral surfaces of differing diameter and hence capable of forwarding the respective components at different speeds.
  • the wrapping component was fed by the higher diameter portion at a feed speed 18 percent greater than the core component.
  • the throughput speed, at the draw roll, was l,000 feet/minute; and the ratio of twisting device rpm. to throughput speed /V) was 9.
  • the draw ratio was 2.85.
  • the core yarn so produced was of low order.
  • a well-integrated core yarn comprising a core component of set false twisted synthetic continuous filaments and at least one wrapping component of synthetic continuous filaments which are formed in helices, the directions of which helices reverse at intervals along the yarn, there being substantially no intermeshing between the filaments of the core component and the filaments of the wrapping component in the regions where the helices reverse.
  • a core yam according to claim 1 in which at least 95 percent by number of the intervals between helix reversals along the yarn are of length less than 2 cm.
  • a core yam according to claim 1 in which at least 50 percent by number of the intervals between helix reversals along the yarn are of length less than 0.5 cm.
  • a core yarn according to claim 1 which contains filaments differing in respect of chemical character.
  • a core yarn according to claim 1 which has been stabilized to decay torque.
  • said process comprising supplying at least two synthetic continuous filamentary components to in sequence a feed means, a heating zone and a false twisting element and withdrawing said filamentary components from said sequence under a higher tension than that under which the said components were supplied to said sequence the filamentary components differing as to their extensibility under the stresses on entering the yarn section of increasing twist gradient.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
US805598A 1968-03-27 1969-03-10 Novel core yarns and methods for their manufacture Expired - Lifetime US3577873A (en)

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Application Number Priority Date Filing Date Title
GB1476468 1968-03-27
GB4061868 1968-08-26
GB4061668 1968-08-26
GB4061768 1968-08-26

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US (1) US3577873A (xx)
BE (1) BE730596A (xx)
CH (2) CH459669A4 (xx)
DE (2) DE1915821B2 (xx)
DK (1) DK139035B (xx)
FR (1) FR2004868A1 (xx)
NL (1) NL161516C (xx)
SE (1) SE370961B (xx)

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4845661A (xx) * 1971-10-18 1973-06-29
US3744232A (en) * 1971-04-05 1973-07-10 Bigelow Sanford Inc Composite false-twist yarn
US3952496A (en) * 1969-02-19 1976-04-27 Akzona Incorporated Composite thread
US3991548A (en) * 1973-03-16 1976-11-16 Du Pont Of Canada Limited Composite yarns
US3999361A (en) * 1974-04-19 1976-12-28 Commonwealth Scientific And Industrial Research Organization Method of and apparatus for forming a multi-ply yarn
FR2415679A1 (fr) * 1978-01-27 1979-08-24 Teijin Ltd Fil composite texture et procede pour le produire
JPS55142726A (en) * 1979-04-20 1980-11-07 Mitsubishi Rayon Co Production of crimped yarn having multiileaf cross area
US4309869A (en) * 1979-01-08 1982-01-12 Multiflex, Inc. Method and apparatus for forming a non-tensioned multi-conduit line
US4955189A (en) * 1987-11-12 1990-09-11 Teijin Limited Worsted yarn-like false-twisted yarn
US6898811B2 (en) 2002-09-10 2005-05-31 Pediatric Medical Devices, Inc. Device for emergency transport of pediatric patients
WO2005085504A1 (en) * 2004-02-27 2005-09-15 E.I. Dupont De Nemours And Company Spun yarn, and method and apparatus for the manufacture thereof
US6945026B1 (en) * 1998-12-03 2005-09-20 Dyers Road Re-Manufacturing And Imports Limited Fibre yarn and rope production
US20060145386A1 (en) * 1999-06-14 2006-07-06 E.I. Du Pont De Nemours And Company Stretch break method and product
US20060204753A1 (en) * 2001-11-21 2006-09-14 Glen Simmonds Stretch Break Method and Product
US20110146832A1 (en) * 2009-12-22 2011-06-23 Chih-Chang Hsu Process of manufacturing ultra-soft yarn and fabric thereof
US9080265B2 (en) * 2012-11-19 2015-07-14 New Horizon Elastic Fabric Co., Ltd Fabric strap with soft side edges
US20180237960A1 (en) * 2014-12-12 2018-08-23 Toray Fibers & Textiles Research Laboratories (China) Co., Ltd. Cotton-like knitted fabric, polyester filament and production method thereof
US11019942B1 (en) 2018-05-21 2021-06-01 Pediatric Medical Llc Cushions for safe, sanitary transportation of children

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Publication number Priority date Publication date Assignee Title
GB1420076A (en) * 1972-04-12 1976-01-07 Ici Ltd Core yarns and methods for their manufacture
US4060970A (en) * 1976-04-07 1977-12-06 Fiber Industries Inc. Simulated spun-like bulked yarn
US4170867A (en) * 1978-02-27 1979-10-16 Phillips Petroleum Company Spun-like continuous multifilament yarn
US4287714A (en) * 1978-08-31 1981-09-08 Oda Gosen Kogyo Kabushiki Kaisha False-twisting system
CH624527B (de) * 1979-06-07 Schweizerische Viscose Falschdralltexturiertes filamentgarn aus synthetischen polymeren.

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US3078653A (en) * 1961-07-21 1963-02-26 Kendall & Co Wrapped elastic yarn
US3225533A (en) * 1961-10-19 1965-12-28 Commw Scient Ind Res Org Apparatus and process for forming yarns and other twisted assemblies
US3336743A (en) * 1965-12-06 1967-08-22 Kendall & Co Composite yarn and process therefor
US3401516A (en) * 1966-05-31 1968-09-17 Monsanto Co High bulk continuous filament low stretch yarn
US3434275A (en) * 1967-04-26 1969-03-25 Stanley Backer Alternate twist yarns and method of forming same

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Publication number Priority date Publication date Assignee Title
US3078653A (en) * 1961-07-21 1963-02-26 Kendall & Co Wrapped elastic yarn
US3225533A (en) * 1961-10-19 1965-12-28 Commw Scient Ind Res Org Apparatus and process for forming yarns and other twisted assemblies
US3336743A (en) * 1965-12-06 1967-08-22 Kendall & Co Composite yarn and process therefor
US3401516A (en) * 1966-05-31 1968-09-17 Monsanto Co High bulk continuous filament low stretch yarn
US3434275A (en) * 1967-04-26 1969-03-25 Stanley Backer Alternate twist yarns and method of forming same

Cited By (26)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3952496A (en) * 1969-02-19 1976-04-27 Akzona Incorporated Composite thread
US3744232A (en) * 1971-04-05 1973-07-10 Bigelow Sanford Inc Composite false-twist yarn
JPS4845661A (xx) * 1971-10-18 1973-06-29
JPS5344577B2 (xx) * 1971-10-18 1978-11-30
US3991548A (en) * 1973-03-16 1976-11-16 Du Pont Of Canada Limited Composite yarns
US3999361A (en) * 1974-04-19 1976-12-28 Commonwealth Scientific And Industrial Research Organization Method of and apparatus for forming a multi-ply yarn
FR2415679A1 (fr) * 1978-01-27 1979-08-24 Teijin Ltd Fil composite texture et procede pour le produire
US4307565A (en) * 1978-01-27 1981-12-29 Teijin Limited Spun yarn-like textured composite yarn and a process for manufacturing the same
US4309869A (en) * 1979-01-08 1982-01-12 Multiflex, Inc. Method and apparatus for forming a non-tensioned multi-conduit line
JPS55142726A (en) * 1979-04-20 1980-11-07 Mitsubishi Rayon Co Production of crimped yarn having multiileaf cross area
JPS6142008B2 (xx) * 1979-04-20 1986-09-18 Mitsubishi Rayon Co
US4955189A (en) * 1987-11-12 1990-09-11 Teijin Limited Worsted yarn-like false-twisted yarn
US6945026B1 (en) * 1998-12-03 2005-09-20 Dyers Road Re-Manufacturing And Imports Limited Fibre yarn and rope production
US7454816B2 (en) 1999-06-14 2008-11-25 E.I. Du Pont De Nemours And Company Stretch break method, apparatus and product
US20060145386A1 (en) * 1999-06-14 2006-07-06 E.I. Du Pont De Nemours And Company Stretch break method and product
US20060150372A1 (en) * 1999-06-14 2006-07-13 Peter Popper Stretch break method, apparatus and product
US7559121B2 (en) 1999-06-14 2009-07-14 E.I. Du Pont De Nemours And Company Stretch break method and product
US20060204753A1 (en) * 2001-11-21 2006-09-14 Glen Simmonds Stretch Break Method and Product
US6898811B2 (en) 2002-09-10 2005-05-31 Pediatric Medical Devices, Inc. Device for emergency transport of pediatric patients
WO2005085504A1 (en) * 2004-02-27 2005-09-15 E.I. Dupont De Nemours And Company Spun yarn, and method and apparatus for the manufacture thereof
US7581376B2 (en) 2004-02-27 2009-09-01 E.I. Du Pont De Nemours And Company Spun yarn, and method and apparatus for the manufacture thereof
US20110146832A1 (en) * 2009-12-22 2011-06-23 Chih-Chang Hsu Process of manufacturing ultra-soft yarn and fabric thereof
US8276358B2 (en) 2009-12-22 2012-10-02 Ruentex Industries Limited Process of manufacturing ultra-soft yarn and fabric thereof
US9080265B2 (en) * 2012-11-19 2015-07-14 New Horizon Elastic Fabric Co., Ltd Fabric strap with soft side edges
US20180237960A1 (en) * 2014-12-12 2018-08-23 Toray Fibers & Textiles Research Laboratories (China) Co., Ltd. Cotton-like knitted fabric, polyester filament and production method thereof
US11019942B1 (en) 2018-05-21 2021-06-01 Pediatric Medical Llc Cushions for safe, sanitary transportation of children

Also Published As

Publication number Publication date
CH518386A (de) 1971-08-31
DE1915821B2 (de) 1979-12-20
NL161516C (nl) 1984-12-17
BE730596A (xx) 1969-09-29
DE6912494U (de) 1970-04-16
DK139035C (xx) 1979-05-14
NL6904287A (xx) 1969-09-30
DK139035B (da) 1978-12-04
FR2004868A1 (xx) 1969-12-05
NL161516B (nl) 1979-09-17
DE1915821A1 (de) 1969-10-09
SE370961B (xx) 1974-11-04
CH459669A4 (xx) 1971-08-31

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