EP0200703A2 - Vororientiertes Nylongarn und Verfahren zu seiner Herstellung - Google Patents

Vororientiertes Nylongarn und Verfahren zu seiner Herstellung Download PDF

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Publication number
EP0200703A2
EP0200703A2 EP86870050A EP86870050A EP0200703A2 EP 0200703 A2 EP0200703 A2 EP 0200703A2 EP 86870050 A EP86870050 A EP 86870050A EP 86870050 A EP86870050 A EP 86870050A EP 0200703 A2 EP0200703 A2 EP 0200703A2
Authority
EP
European Patent Office
Prior art keywords
yarn
sheath
filament
core
twist
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP86870050A
Other languages
English (en)
French (fr)
Other versions
EP0200703A3 (de
Inventor
Dror Selivansky
John Hoyle Southern
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Monsanto Co
Original Assignee
Monsanto Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Monsanto Co filed Critical Monsanto Co
Publication of EP0200703A2 publication Critical patent/EP0200703A2/de
Publication of EP0200703A3 publication Critical patent/EP0200703A3/de
Withdrawn legal-status Critical Current

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    • 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
    • D01F8/12—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof from synthetic polymers with at least one polyamide as constituent
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
    • D01D5/00—Formation of filaments, threads, or the like
    • D01D5/28—Formation of filaments, threads, or the like while mixing different spinning solutions or melts during the spinning operation; Spinnerette packs therefor
    • D01D5/30—Conjugate filaments; Spinnerette packs therefor
    • D01D5/34—Core-skin structure; Spinnerette packs therefor

Definitions

  • nylon 66 shall mean those synthetic linear polyamides containing in the polymer molecule at least 85% by weight of recurring structural units of the formula
  • Friction-twist permits considerably higher texturing speeds than pin-twisting, with yarn speeds currently at about 700-900 mpm. Such high texturing speeds are more economical than those attained by the pin-twist process.
  • PON feeder yarns for false-twist texturing have had RV's in the range from the middle or upper thirties to the low forties, as indicated by U.S. 3,994,121.
  • Such yarns have more than adequate tenacity for conventional apparel end uses, With conventional nylon 66 polymerization techniques, increasing the polymer RV is expensive and leads to increased rates of gel formation, with consequent shortening of spinning pack (filter) life. High RV polymer is therefore ordinarily not used unless required for some special purpose, such as when high yarn tenacity is required.
  • a further and substantial improvement in the art is provided by a novel PON feeder yarn, permitting formation of a friction-twist textured yarn having in some cases markedly higher crimp development than even pin-twist yarns. This permits either or both of increased stretching capability in a fabric or use of even less yarn to provide a fabric of equivalent covering power, even as compared to pin-twist yarns.
  • the yarns of the invention are, broadly, false twist texturing feed yarns spun at high speeds and characterized by a sheath-core conjugate structure, with the sheaths formed from nylon 66 polymer having a lower temperature than the polymer forming the cores.
  • the mechanism or precise reason for the improved results of the present invention are not entirely understood.
  • a process for spinning a sheath-core filament comprising generating a molten stream comprising a nylon 66 sheath component and a core component having a higher temperature than the sheath component, extruding the stream through a spinneret capillary, quenching the stream into a filament, and withdrawing the filament at a spinning speed of at least 2200 MPM.
  • the core component is preferably nylon 66, and the sheath component preferably has the same RV as said core component.
  • the RV of the sheath component is at least 50, with best results obtained when the RV of the sheath component is at least 60.
  • the sheath-core volumetric ratio is less than 1 to 1, with best results being obtained when the sheath-core volumetric ratio is less than 3 to 7.
  • the spinning speed is selected such that the filament has an elongation lower than 100%, with a filament elongation between 40% to 90% being preferred. Improved results are frequently obtained when the filament is drawn and wound at a winding speed between 1.1 and 2 times as fast as the spinning speed.
  • molten polymer streams 20 are extruded through capillaries in spinneret 22 downwardly into quench zone 24 supplied with transversely directed quenching air at room temperature.
  • Streams 20 solidify into filaments 26 at some distance below the spinneret within the quench zone.
  • Filaments 26 are converged to form yarn 28 and pass through interfloor conditioner tube 30.
  • a conventional spin-finish is applied to yarn 28 by finish roll 32.
  • Yarn 28 next passes in partial wraps about godets 34 and 36 and is wound on package 38.
  • the filaments may be entangled if desired, as by pneumatic tangle chamber 40.
  • godets 34 and 36 perform the functions of withdrawing filaments 26 from streams 20 at a spinning speed determined by the peripheral speed of godet 34, and of reducing the tension in yarn 28 from the rather high level just prior to godet 34 to an acceptable level for winding onto package 38.
  • Winding tensions within the range of 0.03 to 0.25 grams per denier are preferred, with tensions of about 0.1 grams per denier being particularly preferred.
  • Godets 34 and 36 may be dispensed with if the yarn winding tension immediately prior to the winder in the absence of the godets is within the yarn tension ranges indicated in this paragraph.
  • "Winding tension” as used herein means the yarn tension as measured just prior to the yarn traversing and winding mechanism.
  • Some commercially available winders include an auxiliary roll designed to both assist in yarn traversing and to permit reducing the yarn tension as the yarn is wound onto the bobbin or package. Such winders may be of assistance when using the upper portions of the yarn tension ranges indicated in this paragraph.
  • Nylon 66 polymer having an RY of 39 is extruded through a conventional spinning pack and spinneret at a melt temperature of 285°C.
  • Spinneret 22 contains 34 capillaries having lengths of 0.012" (0.3 mm.) and diameters of 0.009" (0.229 mm.)
  • Quench zone 24 is 35 (60.96 to 88.9 cm) inches in height, and is supplied with 20oC. quench air having an average horizontal velocity of 1 foot (30.5 cm.) per second.
  • Filaments 26 are converged into yarn 28 approximately 36 inches (91.4 cm.) below the spinneret.
  • Conditioner tube 30 is 72 inches (183 cm.) long and is of the type disclosed in Koschinek U.S.
  • 4,181,697 i.e., a seamless tube heated to 120°C. through which yarn 28 passes.
  • the speed of godets 34 and 36 are 3500 meters per minute and 3535 meters per minutes, respectively, to prevent the yarn from wrapping on godet 36.
  • the polymer metering rate is selected such that the yarn wound has a denier of 103.
  • the winder used is the Toray 601, and the winder speed is adjusted to provide a winding tension of 0.1 grams per denier.
  • the yarn has an elongation-to-break of 85% and an RV of 41 (about 700 poise calculated zero shear rate viscosity at 284°C).
  • the spun yarn is then simultaneously drawn and friction-twist textured on a Barmag FK6-L900 texturing machine using a 2-1/2 meter primary heater and a Barmag disc-aggregate with Kyocera ceramic discs in a draw zone between a feed and draw or mid roll.
  • the heater temperature is 225°C.
  • the ratio of the peripheral speed of the discs to draw roll speed (the D/Y ratio) is 1:95.
  • the draw roll speed is set at 750 meters per minute, and the feed roll speed is adjusted to some lower speed to control the draw ratio and hence the draw-texturing tension (the yarn tension between the exit of the heater and the aggregate).
  • the draw ratio is changed by adjustment of the feed roll speed so that the draw-texturing tension is high enough for stability in the false twist zone and yet low enough that the filaments are not broken, this being the operable texturing tension range.
  • the "maximum texturing tension” is defined as the tension producing the maximum initial crimp development without an unacceptable level of broken filaments (frays). More than 10 broken filaments per kilogram are unacceptable in commercial use.
  • the operable texturing tension range is quite narrow when draw-texturing at 750 meters per minute.
  • the maximum texturing tension is found to be about 0.43 grams per draw roll denier, and the aged crimp development (yarn stored on the bobbin two weeks after texturing) is about 13-16%.
  • the draw roll denier is defined as the spun yarn denier divided by the mechanical draw ratio provided by the different surface speeds of the feed roll feeding the yarn to the heater and of the draw or mid roll just downstream of the false-twist device.
  • the texturing tension is more than 0.45 grams per draw roll denier, an unacceptable level of broken filaments is produced. An attempt to increase initial crimp development by increase in heater temperature much above 225°C. also leads to an unacceptable level of broken filaments.
  • the textured yarn denier is about 70.
  • FIGURE 2 illustrates the preferred sheath-core filament according to the invention, with sheath 42 surrounding core 44.
  • Spinneret pack designs for forming such sheath-core filaments are well known in the art.
  • sheath 42 is nylon 66 spun at a lower temperature than core 44 and the spinning speed is at least 2200 MPM.
  • Example 1 This is an example according to the invention.
  • the apparatus described in Example 1 is used except the spinneret pack used in Examples 1 and 2 above is replaced by a spinneret pack designed to produce 34 sheath-core filaments.
  • a batch of nylon 66 polymer is dried to produce nominal 55 yarn RV (about 1288 poise calculated zero shear rate viscosity at 285°C.).
  • the molten polymer is split into two streams and spun under the conditions set forth in Example 1 above as sheath-core filaments with the sheath polymer streams at a temperature of 285°C. and the core polymer streams at a temperature of 300°C., the sheath-core volumetric ratio being 2 to 3. That is, 40% by volume of the filament is formed by the sheath component, with the remaining 60% being formed'by the core.
  • the resulting textured yarn has a denier of 70 and an aged crimp development higher than that of the yarn in Example 2 above.
  • the increased crimp development provides for greater stretch and covering power in fabrics made from the textured yarn of the invention.
  • Example 3 It has been discovered that a small amount of draw (between 1.05 and 2.0 draw ratio) prior to winding gives improved results in some instances.
  • Example 3 is repeated, except the speed of godet 34 is reduced to provide a draw ratio of about 1.3.
  • the resulting PON when drawtextured has still higher crimp development than that in Example 3.
  • All yarn packages to be tested are conditioned at 21 degrees C. and 65% relative humidity for one day prior to testing.
  • the yarn elongation-to-break (commonly referred to as "elongation") is measured one week after spinning. Fifty yards of yarn are stripped from the bobbin and discarded. Elongation-to-break is determined using an Instron tensile testing instrument. The gage length (initial length) of yarn sample between clamps on the instrument) is 25 cm., and the crosshead speed is 30 cm. per minute. The yarn is extended until it breaks. Elongation-to-break is defined as the increase in sample length at the time of maximum load or force (stress) applied, expressed as a percentage of the original gage length (25 cm.).
  • Crimp development is measured as follows. Yarn is wound at a positive tension less than 2 grams on a Suter denier reel or equivalent to provide a 1-1/8 meter circumference skein. The number of reel revolutions is determined by 2840/yarn denier, to the nearest revolution. This provides a skein of approximately 5680 skein denier and an initial skein length of 9/16 meter. A 14.2 gram weight or load is suspended from the skein, and the loaded skein is placed in a forced-air oven maintained at 180°C. for 5 minutes.
  • the skein is then removed from the oven and conditioned for 1 minute at room temperature with the 14.2 gram weight still suspended from the skein, at which time the skein length L2 is measured to the nearest 0.1 cm.
  • the 14.2 gram weight is then replaced with a 650 gram weight. Thirty seconds after the 650 gram weight is applied to the skein, the skein length L3 is measured to the nearest 0.1 cm.
  • Percentage crimp development is defined as L3-L2/L3 x 100. Crimp development decreases with time as the textured yarn ages on the bobbin, rapidly for the first hours and days, then more slowly. When "aged crimp development" is specified herein, the textured yarn is stored on its bobbin at room temperature, and measurement is made two weeks after texturing.
  • Relatively viscosity is determined by ASTM D789-81, using 90% formic acid.
  • Broken filaments are determined visually, by counting the number of broken filaments on the exposed surfaces of the package.

Landscapes

  • 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)
  • Multicomponent Fibers (AREA)
  • Spinning Methods And Devices For Manufacturing Artificial Fibers (AREA)
EP86870050A 1985-04-22 1986-04-21 Vororientiertes Nylongarn und Verfahren zu seiner Herstellung Withdrawn EP0200703A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US72573985A 1985-04-22 1985-04-22
US725739 1985-04-22

Publications (2)

Publication Number Publication Date
EP0200703A2 true EP0200703A2 (de) 1986-11-05
EP0200703A3 EP0200703A3 (de) 1989-01-18

Family

ID=24915775

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86870050A Withdrawn EP0200703A3 (de) 1985-04-22 1986-04-21 Vororientiertes Nylongarn und Verfahren zu seiner Herstellung

Country Status (4)

Country Link
EP (1) EP0200703A3 (de)
JP (1) JPS61245313A (de)
KR (1) KR880001032B1 (de)
CA (1) CA1274660A (de)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1435462A1 (de) * 1964-05-26 1969-11-13 Hoechst Ag Verfahren zur Herstellung von kraeuselbaren Faeden aus synthetischen linearen Polymeren
US3536802A (en) * 1965-08-02 1970-10-27 Kanebo Ltd Method for spinning composite filaments
US3861843A (en) * 1966-02-07 1975-01-21 Celanese Corp Apparatus for forming laminar crimpable filaments
ES531410A0 (es) * 1983-04-11 1985-06-16 Monsanto Co Un procedimiento para producir filamentos conjugados

Also Published As

Publication number Publication date
CA1274660C (en) 1990-10-02
KR880001032B1 (ko) 1988-06-15
KR860008305A (ko) 1986-11-14
JPS61245313A (ja) 1986-10-31
EP0200703A3 (de) 1989-01-18
CA1274660A (en) 1990-10-02

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