US3365874A - Treatment of synthetic filaments - Google Patents

Treatment of synthetic filaments Download PDF

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Publication number
US3365874A
US3365874A US496634A US49663465A US3365874A US 3365874 A US3365874 A US 3365874A US 496634 A US496634 A US 496634A US 49663465 A US49663465 A US 49663465A US 3365874 A US3365874 A US 3365874A
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United States
Prior art keywords
yarn
filaments
solvent
twist
roll
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Expired - Lifetime
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US496634A
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English (en)
Inventor
Ronald W Chidgey
Claude M Irwin
Paul E Sikorski
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Monsanto Co
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Monsanto Co
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Filing date
Publication date
Priority to NL129961D priority Critical patent/NL129961C/xx
Priority to GB1054567D priority patent/GB1054567A/en
Priority to NO155386A priority patent/NO118444B/no
Priority to NL6412987A priority patent/NL6412987A/xx
Priority to IL22423A priority patent/IL22423A/en
Priority to BE655469D priority patent/BE655469A/xx
Priority to FR994479A priority patent/FR1420615A/fr
Priority to SE13600/64A priority patent/SE300779B/xx
Priority to DE19641435588 priority patent/DE1435588A1/de
Priority to CH1423167A priority patent/CH486575A/de
Priority to LU47328D priority patent/LU47328A1/xx
Application filed by Monsanto Co filed Critical Monsanto Co
Priority to US496634A priority patent/US3365874A/en
Priority to US496635A priority patent/US3287888A/en
Application granted granted Critical
Publication of US3365874A publication Critical patent/US3365874A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • D—TEXTILES; PAPER
    • D02—YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING
    • D02J—FINISHING OR DRESSING OF FILAMENTS, YARNS, THREADS, CORDS, ROPES OR THE LIKE
    • D02J1/00—Modifying the structure or properties resulting from a particular structure; Modifying, retaining, or restoring the physical form or cross-sectional shape, e.g. by use of dies or squeeze rollers
    • D02J1/22—Stretching or tensioning, shrinking or relaxing, e.g. by use of overfeed and underfeed apparatus, or preventing stretch
    • D02J1/229—Relaxing
    • 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
    • D01D10/00—Physical treatment of artificial filaments or the like during manufacture, i.e. during a continuous production process before the filaments have been collected
    • D01D10/04—Supporting filaments or the like during their treatment
    • D01D10/0436—Supporting filaments or the like during their treatment while in continuous movement
    • 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
    • D02G3/40—Yarns in which fibres are united by adhesives; Impregnated 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
    • 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
    • D02G3/40—Yarns in which fibres are united by adhesives; Impregnated yarns or threads
    • D02G3/402—Yarns in which fibres are united by adhesives; Impregnated yarns or threads the adhesive being one component of the yarn, i.e. thermoplastic yarn
    • D—TEXTILES; PAPER
    • D02—YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING
    • D02J—FINISHING OR DRESSING OF FILAMENTS, YARNS, THREADS, CORDS, ROPES OR THE LIKE
    • D02J1/00—Modifying the structure or properties resulting from a particular structure; Modifying, retaining, or restoring the physical form or cross-sectional shape, e.g. by use of dies or squeeze rollers
    • D02J1/22—Stretching or tensioning, shrinking or relaxing, e.g. by use of overfeed and underfeed apparatus, or preventing stretch
    • D02J1/225—Mechanical characteristics of stretching apparatus

Definitions

  • This invention relates to treatment of synthetic fila ments. More particularly, the invention relates toga process and apparatus for treating untwisted nylon filament yarn to relax some and to render same adaptable for use as warp yarn in fabric construction.
  • a recent disclosure describes a process of whipping running yarn of zero or low twist in a confined zone under some tension by perpendicular impingement of a small stream of gas moving at a high velocity.
  • the whipping action causes :he filaments to become interlaced and intertwined.
  • the interlaced yarn exhibits very irregular light rellectances because large and small groups of the filaments become erratically entangled. This irregular light reflecting phenomenon is referred to as flashes and is quite undesirable from an aesthetic standpoint.
  • Various resins, potentially resinous materials, adhesives and sizes have been applied to spun yarns or zero twist filament yarns to insure adequate handling characteristics without too much success. These known bonding agents adversely affect the dyeing and tactile properties of the yarn and fabric made therefrom.
  • Nylon filaments and filaments of other synthetic thermoplastic polymers after being spun have relatively low tensile strength and low molecular orientation.
  • the filaments are stretched a desired amount by attenuating them using thread advancing devices operated at a predetermined peripheral speed differential therebetween.
  • the drawn filaments are placed under considerable stress during the stretching operation. Most of this stress is relieved in the form of an immediate elastic recovery when the tension on the filament is first reduced.
  • the elastic recovery ordinarily occurs between the drawing device and the yarn take-up device by significantly reducing the tension on the filaments at this point in the drawing operation.
  • the elastic recovery is manifested by a quick reduction in length of the filamerits. Usually, this reduction in length may vary from four to eight percent of the length of the drawn filaments, depending upon processing conditions employed.
  • the filaments In addition to the tendency of the filaments to contract quickly after being drawn, the filaments have a latent overstrain that is slow to be relieved a room temperature. It may take as long as twenty-four hours at room temperature to relieve this strain completely even when the filameris are under little or no tension. I has long been recognized that relief of the latent strain can be hastened by relaxing nylon filaments and filaments of other synthetic thermoplastic polymers at elevated temperatures which causes longitudinal shrinking of the filaments by an additional amount. Hot relaxing has been accomplished by steaming the filaments or by applying heat to the filaments in other ways immediately after drawing and before package formation. Unfortunately, complete relaxation of the filaments ordinarily is gained at the expense of obtaining filaments having an undesirably low initial modulus.
  • a particular uncrimped continuous multifilament yarn made of a synthetic thermoplastic polymer is provided.
  • the individual filaments of the yarn are in substantially parallel contiguous relation with little or no twist imparted therein.
  • the individual filaments are cohered or attached together at random points to impart a simulated unifilar character thereto and are arranged to render compact transverse rotundness to the yarn.
  • the yarn can be relaxed or stressrelicyed so as to be mitigated against a latent tendency to retract.
  • the yarn usually is not crimped; that is, the filaments of the yarn are substantially straight and unbent and have not been textured or otherwise deformed to increase the bulk thereof.
  • the individual filaments are substantially parallel which means they do not criss-cross to a large extent and are not interlaced which would disturb the parallelism of zero twist filaments.
  • the ya-rn can be relaxed, thereby having reduced tendency to contract in length. Being thus treated, the yarn exhibits low shrinkage and relatively high initial modulus.
  • the yarn is not ribbon.- like or pronouncedly flat-sided but rather has a transverse rotundness as a threadline of normal untreated man-made filaments.
  • synthetic continuous filament yarn traveling longitudinally from a source of supply is stretched in a zone several times the original length thereof. Thereafter a peripheral effort is applied to the yarn to impart a slight false twist thereto with the twist running back toward the stretch zone.
  • the amount of false twist will be about 2 to 20 turns per inch.
  • One form of apparatus for treating filaments in the multistage operation herein described includes suitable means for longitudinally forwardly molecularly orientable (undrawn) filament yarn from a suitable source at a predetermined rate.
  • a driven draw roll is positioned in the yarn path and is adapted to forward the yarn at a speed such that the yarn is stretched a desired amount between the forwarding means and the draw roll.
  • Disposed in the yarn path therebetween is a yarn snubbing pin to apply a selected resistance to the forward move ment of the yarn so that the point of stretching of the filaments is localized.
  • a freely rotatable separator roll is positioned adjacent the draw roll in spaced relationship therewith.
  • the axis of the separator roll is at a slight angle with respect to the al'is of the draw roll in order that yarn normally progressing around the draw roll and the separator roll moves in a helical path.
  • a rotatable yarn heating element mounted adjacent the draw roll in spaced relationship therewith in the yarn path is a rotatable yarn heating element having a circumferential flange. The yarn is heated to an elevated temperature by contact with this element after it has been drawn.
  • the flange is adapted to exert a peripheral effort on the yarn so as to impart a slight false twist thereto.
  • the element preferably is a heated roll positioned axially at a slight angle with respect to the axis of the draw roll in order that the yarn normally progressing around the draw roll and the heated roll moves in a helical path.
  • means for applying a small amount of a liquid evanescent solvent is positioned in the yarn path between the draw roll and the flange where the yarn has a slight false twist.
  • Means for taking up the yarn in a orderly manner is provided without subjecting the yarn to high tension.
  • means for applying a finish or lubricant can be employed.
  • undrawn filament nylon yarn is longitudinally forwarded to a stretch zone to increase the orientation of the molecules thereof.
  • the temperature of the yarn is raised to about 150490 C.
  • the molecular friction during the necking down of the filaments in drawing plus the surface friction between the snubbing pin and the yarn at the speeds ordinarily employed are sufficient to increase the temperature of the yarn to this range.
  • the snubbing pin can be positively heated, such as by providing an electrically resistant element inside the snubbing pin.
  • the yarn is cooled to about 40-145 C.
  • the tension on the yarn is reduced.
  • This can be accomplished by multi-warps of the yarn around the driven draw roll and the separator roll. Three, four, or more wraps are sufficient to provide sufficient gripping of the yarn during the drawing thereof and to provide sutiicient reduction of tension thereon. As is known, the tension on the yarn diminishes as the number of wraps increases.
  • a rotational moment is imparted to filaments to false twist the yarn slightly. As indicated above, the amount of twist will be only 2-20 turns per inch. While having this twist, a liquid evanescent solvent is applied to the yarn in a small amount. Ordinarily about 0.2-5.0 percent of the solvent is sufficient to effect sufficient integrality or cohesion of the filaments, although more or lesser amounts of solvent may be employed depending on the type of yarn, type of solvent, degree of cohesion desired, etc.
  • the yarn is detwisted and heated quickly to about ISO-190 C. to dry the yarn and to deactivate the action of the solvent while the yarn is under reduced tension permitting relaxation thereof. Heating is accomplished by passing the yarn in contacting engagement witl". a heated surface having a peripheral speed substantially equal to the speed of the yarn. The time during which the yarn is heated by the surface is from about 0.001 to 0.4 second, preferably from 0.001 to 0.05 second.
  • This yarn is moved in a figure of eight path, the heating of the yarn by means of the heated surface to the temperature of about 150-190 C. being effected on the inside of the loop of the figure of eight path wherein the yarn moves in a direction opposite to that taken by the yarn around the rolls.
  • the yarn is cooled quickly to about 40-130 C.
  • the cooling of the yarn is preferably accomplished as it moves in the.loop of the figure of eight path wherein the yarn moves in the same direction as that taken by the yarn around the draw roll and separator roll.
  • the yarn again is heated quickly to about 150-490 C. This is accomplished by passing the yarn again in contacting engagement with the same or different moving heated surface.
  • the time during which the yarn is heated by the surface is from about 0.001 to 0.4 second, preferably from 0.001 to 0.05 second.
  • the yarn is looped back so that heating thereof is effected again on the inside of the loop of a figure of eight path wherein the yarn moves in a direction opposite to that taken by the yarn around the draw roll and and separator roll.
  • the yarn is cooled while the yarn is under a tension of about 0.02-0.2 gram per denier; the heat can be dissipated to the ambient air and to the rolls. Thereafter, the yarn is taken up in an orderly manner in package form under a tension of about 0.05-0.4 gram per denier at a speed of about four to twelve percent less than the speed of the yarn immediately after it is drawn.
  • the yarn can be wound on a bobbin or the like. Before take-up a finish, lubricant or like beneficiating agent can be applied to the yarn to improve its handling characteristics. The yarn even though not twisted can be employed in the warp or filling of woven fabric as similar yarn having considerable twist.
  • the single figure is a schematic view in perspective with principal parts in location illustrating one yarn lacing arrangement employing the apparatus of the invention.
  • yarn I which is to be treated and which is composed of a bundle of smooth substantially parallel filaments that have not been fully oriented, is supplied from a yarn source.
  • the yarn source can be, for example, a package previously doffed from a conventional filament spinning machine.
  • the apparatus as illustrated can be adapted readily for processing continuous filament yarn which is supplied directly from the spinning machine without an intermediate take-up.
  • the yarn is passed to a rotatably arranged thread advancing means comprising a pair of feed rolls 2, at least one of which is positively driven. The rolls engage each other to nip the yarn sufficiently to prevent slippage of the yarn therebetween.
  • the yarn is led around a snubbing pin 3 or like yarn braking means.
  • the pin preferably is mounted to be non-rotative and has a smooth yarn contact surface made of material having a high resistance to wear. As indicated above, the pin can be heated if needed to raise the temperature of the yarn to the required temperature, although positive heating of the pin is not necessary normally.
  • yarn 1 is directed around a rotatably mounted draw roll 4 and its associated separator roll 5 which is freely rotatably mounted.
  • Roll 4 is positively driven at a peripheral speed such that the yarn is given a predetermined stretch between rolls 2 and 4 which define a stretch zone.
  • the yarn takes five wraps around rolls 4 and 5, the axes of which are asitew so as to permit longitudinal advancement of the yarn from inside to outside of the roll and to prevent superimpositioning of the wraps.
  • This number of wraps normally provides sufficient gripping action so that the yarn is stretched as desired without yarn slippage.
  • the yarn normally has an elevated temperature and is under a high tension depending upon the ultimate denier and elongation of the yarn.
  • the yarn is cooled; and the tension on the yarn is gradually reduced with each succeeding wrap.
  • a freely rotatable heated yarn relaxing roll 7 having a flange 6 is positioned adjacent draw roll 4 in spaced relationsbip therewith.
  • the axis of roll 7 is at a slight angle with respect to the axis of the draw roll in order that the yarn wraps do not become superimposed.
  • Embedded in roll 7 is an electric resistance heater element (not shown). Lines 7a supply electrical energy to the heater element.
  • the heating of roll 7 can be achieved in other ways, such as by heated fluid inside the roll or by the use of high frequency heating.
  • the yarn detwists, and the yarn is dried to dissipate the action of the solvent.
  • the yarn is again cooled. This can be accomplished by completing the figure of eight path of the yarn around roll 4, the heat being transferred to the ambient air and to the roll.
  • the yarn is again looped back and moved in contacting engagement with roll 7 to reheat the yarn.
  • T third heating by contacting roll 7 and intermediate cooling of the yarn is advantageous to insure better relaxation and to insure dissipation of the action of the solvent.
  • the yarn is then forwarded to a take-up device. Between roll 7 and the take-up device the yarn is cooled.
  • Roll 10 serves as a convenient guide for the yarn moving to the take-up device.
  • One such device is a conventional winder having a drum traverse 11 wherein the yarn is wrapped on a holder 12 to form a package 13 without twist being imparted to the yarn.
  • the yarn may be taken up while being twisted, although twisting of the yarn is not required.
  • the yarn is taken up at speeds permitting reduction in length of the yarn of about four to twelve percent between roll 10 and the point of maximum stretch of the yarn which occurs in the yarn path between pin 3 and roll 4.
  • Yarn forwarding rolls may be interposed in the yarn path beyondroll 1t] and before the point where the yarn is taken up in order to provide better tensioning control.
  • a finish, lubricant or like agent can be applied to the yarn to improve the handling properties thereof. This can be accomplished by the provision of wick appli cator 14 having a beneficiating agent supplied thereto through conduit 15 from a suitable source not shown. For best results only a small amount of finish or like agents is present on the yarn prior to treatment. It has beenfound that an excess amount of such agents on the yarn prior to treatment can interfere adversely with the efficacy of the solvent. Conversely, the solvent may destroy the benefits desired from such agents when the solvent is after applied.
  • tension control mechanisms responsive to variations in yarn tension can be employed to vary appropriately the speed of the yarn forwarding devices to provide better control of the yarn. being processed.
  • the method of the present invention is applicable to a wide variety of synthetic continuous filament yarns.
  • the yarn is made from thermoplastic fiber-forming resins and can be extended by drawing and then shown increased molecular orientation along the axis thereof.
  • the yarn may be formed from these resins by known techniques, including melt extrusion, wet spinning and dry spinning.
  • the fiber-forming synthetic polymers the following may be mentioned: polyethylene; polypropylene; polyurethanes; copolymers of vinyl acetate and vinyl chloride; the copolymers of vinylidene chloride and a minor proportion of mono-olefinic compounds copolymerizable therewith, such as vinyl chloride, homopolymers of acrylonitrile, copolymers of acrylonitrile and a minor proportion of at least one mono-olefinic compound copolymerized therewith and polymer blends containing polymerized acrylonitrile in a major proportion; copolymers of vinyl chloride and acrylonitrile; linear polyesters of aromatic diearboxylic acids and dihydric compounds, such as polyethylene terephthalate; linear polycarbonamides such as, nylon-66, nylon-6, nylon-4, nylon-7, ny- Ion-610 and other fiber-forming copolymers, e.g. 6/ 66, 6/610/66, 66/610, etc. i
  • Filaments having a normal cross section such as that obtained using a circular spinning orifice during filarrent formation can be treated.
  • multi-lobal yarn and yarn having an axial passage can likewise be treated in accordance with the present process.
  • Yarn having some twist can be processed. However, it is preferred to start with a source of yarn having zero twist, since an advantage of the present invention is that the need of twist for rendering the yarn processable into fabric is obviated. For economic considerations twist in the yarn to be processed is avoided.
  • the denier of the yarn can vary as well as the denier of the individual filaments, the ordinary deniers of commercially available yarns being completely suitable.
  • the evanescent solvents are active so as to soften the yarn and to render the same stickable at the temperatures employed.
  • the solvents can be composed of an active substance normally solid at room temperature but readily dissolvable in an inert volatile diluent to form a I single phase liquid. When the yarn carrying the solvent is heated, the diluent flashes therefrom and the action of the active substance is dissipated. Specific solvents will be selected with regard to the type of yarns being processed.
  • solutions of multi-hydroxybenzenes have been found to be effective evanescent solvents.
  • Dihydroxybcnzene compounds which can be cmploycd as the active substance in the solvents include resorcinol. hydroquinone and pyrocatechol.
  • a trihydroxybenzene, for example, is pyrogallol.
  • the multi-hydroxybenzencs are not limited to the foregoing specific compounds since derivatives thereof can also be used to effect cohesion and the stabilization of the yarn.
  • the preferred procedure is to dissolve the compounds in a suitable inert diluent.
  • Dihydroxybenzenes and trihydroxybenzenes are readily soluble in water, common alcohols (methanol, ethanol, etc.) and common ethers (dimethyl ether, diethyl ether, etc.). It has been found] that a preferred procedure involves dissolving a predetermined amount of the benzene compound in water or methanol. An aqueous or methanolic solution containing about 5-80 percent dihydroxybenzene or trihydroxybenzcne on a weight basis gives good results. The preferred concentration is 30-40 weight percent. The concentration of the active substance in the evanescent solvent will depend on many factors,
  • chloral hydrate is also readily soluble in water, common alcohols (methanol, ethanol, etc.) and Common ethers (dimethyl ether, diethyl ether, etc.).
  • a preferred procedure involves dissolving a predetermined amount of chloral hydrate in water or methanol.
  • An aqueous or methanolic solution containing about: 25-:9 weight percent chloral hydrate gives good results.
  • the preferred concentration of chloral hydrate in solution is 4085 weight percent.
  • aliphatic cyclic carbonates are effective evanescent solvent.
  • These carbonates can be selected from the group of the cyclic carbonates of l,2-; 2.3-; and 1,3-dihydric aliphatic alcohols.
  • Such aliphatic cyclic carbonates include ethylene carbonate, propylene carbonate, trimethylene carbonate, 1,2-butyl cue carbonate, l,3-butylene carbonate. 2,3-butylen'e carbonate, isobutylene carbonate and mixtures thereof.
  • ethylene carbonate is ethylene carbonate.
  • An aqueous solution containing about -?0 percent aliphatic cyclic carbonate on a weight basin gives good results.
  • the preferred concentration of aliphatic cyclic carbonate is 40-60 weight percent.
  • Example I An untwisted, undrawn filament nylon-66 yarn with a spun denier of 190 and composed of 34 filaments was removed axially from a spin bobbin and was advanced by means of a pair of feed rolls as shown in the drawing.
  • the yarn was wrapped two times around snubbing pin 3 and then was wrapped four times around draw roll 4 and separator roll 5.
  • the draw ratio employed was 2.7 and the peripheral speed of the draw roll was 800 yards per minute.
  • the yarn was then wrapped around heated roll 7 and brought at an angle across flange 6 which imparted a false twist of about turns per inch to the yarn with the twist running back toward roll 4. While twistcdfaqueous solution of chloral hydrate was wicked onto the yarn.
  • the weight percent of the chloral hydrate in solution was 80.
  • the wicked yarn contained about 2 weight percent of the solution.
  • the temperature of roll 7 was 220 C.
  • the yarn was wrapped around roll 4 for the fifth time and was looped back again around heated roll 7 and roll 4 as shown in the drawing.
  • the yarn was wound onto a cheese" package on a tubular paper core without twisting the yarn.
  • the windup speed was 725 yards per minute.
  • the tension on the yarn during winding was 10 grams.
  • a small amount of finish was applied to the yarn as it passed over wick 14.
  • the resulting yarn exhibited excellent physical properties, having a boiling water residual shrinkage of 6.8 percent and an initial modulus of 26 grams per denier. Shrinkage was uniform throughout the package.
  • the paper core on which the yarn was wound did not collapse, whereas the same type core collapsed and could not be removed from the winding spindle without destroying the package when the same yarn drawn by conventional colddrawing was wound thereon.
  • the yarn was used as the warp in the construction of nylon taffeta.
  • the War was prepared and slashed in a conventional manner.
  • the filling was made of nylon filaments untwisted and not treated in accordance with this example. Good coherency of the warp yarn was maintained during the weaving of the fabric; and it dyed uniformly.
  • the yarn had a rotund cross section and was not pronouncedly flat-sided as would be expected from being passed over a surface in the presence of a solvent.
  • the filaments of the yarn were bonded at random points to adjacent filaments and were maintained in substantial parallel relationship.
  • Percent shrinkage is the initial length of yarn minus the length thereof after boiling divided by the initial length of the yarn times one hundred.
  • Initial modulus is defined as a ratio of change in stress to strain in the first linear portion of a stress-strain curve. The ratio is calculated from the stress, expressed in force per unit linear density, and the strain expressed as percent elongation. As the strain is expressed in terms of elongation, the modulus equals one hundred times the quotient (stress-strain). The modulus is determined at 1V2 percent elongation based on the slope of the curve at this percentage. The modulus is obtained from yarn stress-strain curves measured by the Instron tensile tester, which, in operation, stretches the yarn at a constant rate of elongation. From the stress-strain curve, the stress is measured graphically at 1 /2 percent elongation on the initial linear portion of the stress-strain curve; and the modulus is calculated at one hundred times this value, divided by the denier of the yarn sample.
  • Example II The procedure of the above was repeated except an aqueous solution containing 50 weight percent resorcinol was used instead of chloral hydrate.
  • the nylon-66 yarn contained about 1 weight percent of the solution. It was found that the yarn was relaxed; that is, it was stabilized against longitudinal retraction, having a high initial modulus and low shrinkage. The yarn was suf'liciently coherent that it could be used as warp in the weaving of taffeta without the drawbacks normally encountered when untreated zero .twist yarn is used in the same manner.
  • filament yarn can be drawn and relaxed, as well as rendered coherent in one convenient operation.
  • the yarn is stabilized or mitigated against longitudinal retraction such that cheap disposable paper winding cores can be used by filament manufacturers in shipping the yarn to its customer.
  • the yarn can be wound in the form of a tapered package with considerably less occurrence of pirn taper barre.
  • the filaments of the yarn are maintained in substantial parallel relationship, but the yarn has a unifilar character enabling it to perform in the construction of fabric as a coherent unitary strand.
  • the yarn is not excessively fiat as ribbon but exhibits transverse rotundness.
  • Yarns can be processed at high rates, and existing yarn processing apparatus ,can be modified at modest cost to incorporate the novel apparatus features of the present invention. A warp of these yarns can be conveniently slashed by conventional methods.
  • a method of treating molecularly orientable syn thetic continuous multifilament yarn of substantially zero twist comprising the steps:
  • step (11) 2. The method of claim 1 wherein the yarn is made of nylon and the yarn is heated to a temperature of about 150 190 C. in step (11) thereof.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
US496634A 1963-11-12 1965-10-15 Treatment of synthetic filaments Expired - Lifetime US3365874A (en)

Priority Applications (13)

Application Number Priority Date Filing Date Title
NL129961D NL129961C (it) 1963-11-12
GB1054567D GB1054567A (it) 1963-11-12
NO155386A NO118444B (it) 1963-11-12 1964-11-02
NL6412987A NL6412987A (it) 1963-11-12 1964-11-06
IL22423A IL22423A (en) 1963-11-12 1964-11-09 Synthetic continuous filament yarn,method of preparing it and apparatus therefor
BE655469D BE655469A (it) 1963-11-12 1964-11-09
FR994479A FR1420615A (fr) 1963-11-12 1964-11-10 Traitement des filaments synthétiques
SE13600/64A SE300779B (it) 1963-11-12 1964-11-11
DE19641435588 DE1435588A1 (de) 1963-11-12 1964-11-11 Im.wesentlichen gerades,synthetisches,endloses Mehrfadengarn sowie Verfahren und Vorrichtung zu seiner Herstellung
CH1423167A CH486575A (de) 1963-11-12 1964-11-11 Verfahren zur Herstellung eines praktisch geraden, synthetischen, endlosen Multifilamentgarns, Vorrichtung zur Ausführung des Verfahrens und nach dem Verfahren hergestelltes Garn sowie dessen Verwendung zur Herstellung von textilen Flächengebilden
LU47328D LU47328A1 (it) 1963-11-12 1964-11-11
US496634A US3365874A (en) 1963-11-12 1965-10-15 Treatment of synthetic filaments
US496635A US3287888A (en) 1963-11-12 1965-10-15 Apparatus for the treatment of synthetic filaments

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US32270463A 1963-11-12 1963-11-12
US496635A US3287888A (en) 1963-11-12 1965-10-15 Apparatus for the treatment of synthetic filaments
US496634A US3365874A (en) 1963-11-12 1965-10-15 Treatment of synthetic filaments

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US3365874A true US3365874A (en) 1968-01-30

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US496634A Expired - Lifetime US3365874A (en) 1963-11-12 1965-10-15 Treatment of synthetic filaments
US496635A Expired - Lifetime US3287888A (en) 1963-11-12 1965-10-15 Apparatus for the treatment of synthetic filaments

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US (2) US3365874A (it)
BE (1) BE655469A (it)
DE (1) DE1435588A1 (it)
IL (1) IL22423A (it)
LU (1) LU47328A1 (it)
NL (2) NL6412987A (it)
NO (1) NO118444B (it)
SE (1) SE300779B (it)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3461657A (en) * 1967-10-27 1969-08-19 Scragg & Sons Textile apparatus
US3525206A (en) * 1965-01-19 1970-08-25 Monsanto Co Nylon tire cord
US3536803A (en) * 1964-05-26 1970-10-27 Celanese Corp Process for treating elastomeric fibers
US3601972A (en) * 1968-07-12 1971-08-31 Ici Ltd Drawing and bulking of synthetic filament yarns
US3651633A (en) * 1970-10-27 1972-03-28 Fiber Industries Inc Flange false twist textured nylon
US3828537A (en) * 1971-11-17 1974-08-13 Ici Ltd Production of texturised yarn
US3861129A (en) * 1972-07-13 1975-01-21 Ici Ltd Production of texturised yarn
WO1993003213A1 (en) * 1991-08-05 1993-02-18 J. & P. Coats, Limited Internally bonded sewing threads and processes for production thereof

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3493646A (en) * 1966-10-18 1970-02-03 Monsanto Co Drawing and heat relaxing nylon yarn
DE1685937B1 (de) * 1967-03-25 1972-03-23 Palitex Project Co Gmbh Doppeldrahtzwirnmaschine,bei der jeder Spindel eine Fadensengvorrichtung zugeordnet ist
GB1267231A (it) * 1968-07-16 1972-03-15
US3846969A (en) * 1972-04-13 1974-11-12 Du Pont False-twist texturing yarn of polyester filaments having multilobal cross sections
USRE29363E (en) * 1973-08-30 1977-08-23 E. I. Du Pont De Nemours And Company False-twist texturing yarn of polyester filaments having multilobal cross sections
FR2312579A1 (fr) * 1975-05-27 1976-12-24 Inst Textile De France Procede et installation de fabrication de meches ou files textiles aptes a etre utilises en bonneterie ou en tissage
US4041689A (en) * 1975-11-11 1977-08-16 E. I. Du Pont De Nemours And Company Multilobal polyester yarn
US5802649A (en) * 1996-02-12 1998-09-08 Fypro Method and apparatus for dyeing a traveling textile strand
US5881411A (en) * 1996-12-23 1999-03-16 Fypro Thread Company, Inc. Twisted, dyed and bonded filaments

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2273364A (en) * 1940-02-06 1942-02-17 Wingfoot Corp Filament
US2321726A (en) * 1941-10-23 1943-06-15 Edward D Andrews Method of manufacturing thread
US2946181A (en) * 1958-01-03 1960-07-26 Const Mecaniques De Stains Soc Production of twistless yarns by direct spinning to tow, sizing the tow, false twisting and winding
US3094834A (en) * 1959-07-03 1963-06-25 British Nylon Spinners Ltd Apparatus for simultaneously stretching and falsetwisting yarn
US3114235A (en) * 1959-04-13 1963-12-17 Ethicon Inc Method of forming a round collagen strand
US3161706A (en) * 1961-09-28 1964-12-15 Polythane Corp Method and apparatus for wet spinning elastomeric polymers into a fused multifilament fiber

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2054354A (en) * 1934-12-11 1936-09-15 Edward D Andrews Elastic thread and process of making the same
BE548950A (it) * 1955-07-19
US3025660A (en) * 1957-01-24 1962-03-20 American Enka Corp Drawtwisting process
US2976671A (en) * 1958-10-30 1961-03-28 American Enka Corp Method of threading drawtwister
US3069837A (en) * 1959-06-30 1962-12-25 Du Pont Twisting process
US2988867A (en) * 1960-02-26 1961-06-20 Ind Rayon Corp Method of handling a plurality of yarns during processing
US3124628A (en) * 1960-11-07 1964-03-10 Method for producing twisted

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2273364A (en) * 1940-02-06 1942-02-17 Wingfoot Corp Filament
US2321726A (en) * 1941-10-23 1943-06-15 Edward D Andrews Method of manufacturing thread
US2946181A (en) * 1958-01-03 1960-07-26 Const Mecaniques De Stains Soc Production of twistless yarns by direct spinning to tow, sizing the tow, false twisting and winding
US3114235A (en) * 1959-04-13 1963-12-17 Ethicon Inc Method of forming a round collagen strand
US3094834A (en) * 1959-07-03 1963-06-25 British Nylon Spinners Ltd Apparatus for simultaneously stretching and falsetwisting yarn
US3161706A (en) * 1961-09-28 1964-12-15 Polythane Corp Method and apparatus for wet spinning elastomeric polymers into a fused multifilament fiber

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3536803A (en) * 1964-05-26 1970-10-27 Celanese Corp Process for treating elastomeric fibers
US3525206A (en) * 1965-01-19 1970-08-25 Monsanto Co Nylon tire cord
US3461657A (en) * 1967-10-27 1969-08-19 Scragg & Sons Textile apparatus
US3601972A (en) * 1968-07-12 1971-08-31 Ici Ltd Drawing and bulking of synthetic filament yarns
US3651633A (en) * 1970-10-27 1972-03-28 Fiber Industries Inc Flange false twist textured nylon
US3828537A (en) * 1971-11-17 1974-08-13 Ici Ltd Production of texturised yarn
US3861129A (en) * 1972-07-13 1975-01-21 Ici Ltd Production of texturised yarn
WO1993003213A1 (en) * 1991-08-05 1993-02-18 J. & P. Coats, Limited Internally bonded sewing threads and processes for production thereof

Also Published As

Publication number Publication date
US3287888A (en) 1966-11-29
NL129961C (it)
SE300779B (it) 1968-05-06
LU47328A1 (it) 1965-05-11
NL6412987A (it) 1965-05-13
NO118444B (it) 1969-12-29
IL22423A (en) 1968-09-26
BE655469A (it) 1965-05-10
DE1435588A1 (de) 1969-02-20

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