EP2647746B1 - Fil de polyamide contenant des filaments ultrafines et procédé et dispositif de filage à l'état fondu pour la production de ce fil - Google Patents

Fil de polyamide contenant des filaments ultrafines et procédé et dispositif de filage à l'état fondu pour la production de ce fil Download PDF

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Publication number
EP2647746B1
EP2647746B1 EP11844483.5A EP11844483A EP2647746B1 EP 2647746 B1 EP2647746 B1 EP 2647746B1 EP 11844483 A EP11844483 A EP 11844483A EP 2647746 B1 EP2647746 B1 EP 2647746B1
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EP
European Patent Office
Prior art keywords
filaments
finishing oil
circular
oil supply
yarn
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EP11844483.5A
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German (de)
English (en)
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EP2647746A4 (fr
EP2647746A1 (fr
Inventor
Takeaki Kono
Yasuki Kobayashi
Jun Hanaoka
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Toray Industries Inc
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Toray Industries Inc
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Publication of EP2647746A4 publication Critical patent/EP2647746A4/fr
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Classifications

    • 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
    • D01F6/00—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof
    • D01F6/58—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from homopolycondensation products
    • D01F6/60—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from homopolycondensation products from polyamides
    • 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
    • D01D5/08—Melt spinning methods
    • D01D5/088—Cooling filaments, threads or the like, leaving the spinnerettes
    • 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
    • D01D5/08—Melt spinning methods
    • D01D5/088—Cooling filaments, threads or the like, leaving the spinnerettes
    • D01D5/092—Cooling filaments, threads or the like, leaving the spinnerettes in shafts or chimneys
    • 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
    • D01D5/08—Melt spinning methods
    • D01D5/096—Humidity control, or oiling, of filaments, threads or the like, leaving the spinnerettes
    • 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
    • D01D5/253—Formation of filaments, threads, or the like with a non-circular cross section; Spinnerette packs therefor
    • 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
    • D01F6/00—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof
    • D01F6/58—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from homopolycondensation products
    • D01F6/60—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from homopolycondensation products from polyamides
    • D01F6/605—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from homopolycondensation products from polyamides from aromatic polyamides
    • 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

Definitions

  • the present invention relates to ultrafine polyamide yarn comprising filaments with a very small single filament fineness, and more specifically relates to ultrafine polyamide yarn that serves to impart high softness, smoothness, drape property, high water absorption capacity, high density, and high post-dyeing quality to woven or knitted fabrics.
  • polyamide fibers have been widely used for production of clothing and industrial materials.
  • false-twisted yams have been in wide use for products such as woven fabrics and knitted fabrics, and have been manufactured in large quantities.
  • ultrafine false-twisted yarns with a single yarn fineness of 1.2 dtex or less can produce cloth having very soft texture as well as improved heat retaining and water absorption capacities compared with false-twisted yarns with common levels of single yarn fineness. Accordingly, ultrafine false-twisted yarns have been in increased demands and now dominate the market.
  • ultrafine polyamide fibers For these applications of ultrafine polyamide fibers, there is a proposal of ultrafine polyamide fiber intended for false-twisting that can impart softness to cloth as a result of being produced from ultrafine polyamide fiber for false-twisting containing fiber of polyamide resin with a single yarn fineness of 1.2 dtex or less and having specially specified friction coefficient, elongation percentage, and hot water shrinkage rate (patent document 1).
  • a proposed method for applying a finishing oil uniformly to these ultrafine polyamide fibers is to cool single yams uniformly by means of a so-called ring chimney, which is an apparatus designed so that polymer threads discharged from a spinning spinneret with discharge holes arranged along a ring are cooled by applying cool air in all directions along their inner or outer circumferences, and subsequently apply a finishing oil from oil guides located opposite to each other with the yarns interposed in between (patent document 3).
  • Patent document 4 JP-A- 2005-320655 ;Patent document 2: JP-A- 2009-84749 ;Patent document 3: JP-A- 2007-126759 and Patent document 4: JP-A- 2010-126846 .
  • Ultrafine polyamide fibers are also described in JP-A-2007-077547 .
  • a process for producing a synthetic ultrafine yarn based on polyester or polyamide is disclosed in US-B-6420025 .
  • the finishing oil supply method described in patent document 3 will have to bundle the yarns while supplying a finishing oil.
  • Ultrafine polyamide fibers with a single yarn fineness of 0.5 dtex or less have peculiar disadvantages that the strength of each single yarn decreases, that the single yarns rub each other during the bundling of yarns, and that the fiber before finishing oil supply has a large friction coefficient.
  • the rubbing between single yarns and the rubbing between single yarns and the guides that take place before finishing oil supply will cause breakage of single yarns, prevent the finishing oil from being applied uniformly to single yarns in the inner portions of bundled yarns, cause differences in the amount of the finishing oil and water attached to single yarns, and cause differences in fiber structure among single yarns, thereby leading to dyed yarns with inferior quality.
  • the object of the present invention is to solve the above-mentioned problems with prior art and provide ultrafine polyamide fiber that serves to impart high softness, smoothness, drape property, high water absorption capacity, high density, and high post-dyeing quality to woven or knitted fabrics.
  • the present invention adopts the following constitution to solve the problems described above.
  • ultrafine polyamide yarn being a yarn comprising ultrafine single filaments and serving to produce woven or knitted fabrics with high softness, smoothness, drape property, high water absorption capacity, high density, and high post-dyeing quality that cannot be realized with conventional ultrafine polyamide yarns
  • polyamide fiber that has a single filament fineness of 0.10 dtex or more and 0.50 dtex or less and has an average of 1.0 or less fuzz per 12,000 m in the length direction of the yarn.
  • excellent anti-see-through property can also be imparted according to a preferable embodiment.
  • Polyamide used in the ultrafine polyamide yarn for the present invention is a homopolymer or a copolymer of polyamide, and such a polyamide is a melt-moldable polymer containing an amide bond that is formed from lactam, aminocarboxylic acid, or a salt of dicarboxylic acid with diamine.
  • polystyrene resin There are no specific limitations on the polyamide to be used, and various useful polyamides are available, but polycaproamide (nylon 6) and polyhexamethylene adipamide (nylon 66) are preferable from the viewpoint of fiber-forming capability and dynamic characteristics.
  • Usable copolymers of these polyamides such as nylon 6 and nylon 66 include those in which other units such as aminocaproic acid and lactam account for 20 mol% or less of the total monomer units.
  • a polyamide to be used for the present invention has a sulfuric acid relative viscosity of 2.0 to 3.5, more preferably 2.4 to 3.0, and still more preferably 2.5 to 2.7, from the viewpoint of yarn-making stability.
  • the sulfuric acid relative viscosity should be determined by the method described later.
  • second and third components may be copolymerized with or mixed in the polymer used for the present invention as long as they meet the object of the present invention.
  • the polyamide may contain polyvinyl pyrolidone if hygroscopicity is required in addition to meeting the object of the present invention.
  • the polyamide used for the present invention may contain various additives including, for instance, delustering agent, flame retardant, antioxidant, ultraviolet absorber, infrared ray absorbent, crystal nucleating agent, and fluorescent whitening agent, as required.
  • a preferred process includes the steps of melting polyamide, discharging it from discharge holes arranged circumferentially in the outer circumferential portion of a spinning spinneret, cooling it by a cooling apparatus located below the central portion of the spinneret and designed to cool the melt-spun filaments rapidly and uniformly by applying cooling air from inside or outside of the melt-spun filaments discharged from the discharge holes, and subsequently supplying a finishing oil to each single filament by a circular finishing oil supply apparatus located vertically below the cooling apparatus, followed by bundling of the filaments and second-stage finishing oil supply performed simultaneously by a bundle-guide type finishing oil supply apparatus.
  • the cooling apparatus is preferably a circular type cooling apparatus, more preferably an outward blow type circular cooling apparatus that supply cooling air from inside toward outside of the spun filaments running on circular circumferences or an inward blow type circular cooling apparatus that supply cooling air from outside toward inside of the spun filaments.
  • the use of an outward blow type circular cooling apparatus is particularly preferable.
  • FIGs. 1 to 5 are schematic diagrams illustrating an example of the polyamide yarn production method according to the present invention.
  • Fig. 1 gives an example that uses an outward blow type circular cooling apparatus 3
  • Fig. 5 gives an example that uses an inward blow type circular cooling apparatus 18.
  • the production processes shown in Fig. 1 and Fig. 5 consist of basically the same constituents, and descriptions of constituents with the same numerals are omitted.
  • molten polyamide is discharged through an spinneret 1 and passed through a heat retaining zone 2 under the spinneret, and subsequently, cooling air is applied from inside toward outside of the spun yarns by an outward blow type circular cooling apparatus 3 installed below the spinneret center in order to reduce fineness unevenness in the length direction, thereby rapidly cooling the single filaments at a uniform distance from the spinneret face to cause their solidification.
  • a finishing oil is supplied to each single filament by a circular finishing oil supply apparatus 4 having a disk-like guide portion that is in contact with the single filament at the outer circumferential portion of the disk and also having a finishing oil-discharging circular slit formed directly above the guide portion and along the outer circumference of the guide, followed by bundling of the filaments and second-stage finishing oil supply performed simultaneously by a bundle-guide type finishing oil supply apparatus 5.
  • the filaments are interlaced by an interlacing nozzle 6 as required, and wound up by a winder (wind up apparatus) 9 after passing on a take-up roller 7 and a drawing roller 8.
  • Fiber filaments 10 and a package of the fiber product 11 are also shown. Two or more sets of rollers may be used for drawing before winding-up into a package, but in that case, the draw ratio should be low because the interlaced yarns can become loose as a result of drawing, or an interlacing step may be performed again after drawing.
  • the practice of blowing out steam toward the spinneret face to fill the heat retaining zone 2 under the spinneret with steam is preferred because this prevents the polymer and oligomers contained in the polymer existing around the discharge holes of the spinneret from reacting with oxygen to solidify and contaminate the spinneret.
  • the steam blow-out pressure is 0.1 to 0.5 kPa. If the blow-out pressure is too low, the oxygen concentration in the heat retaining zone under the spinneret will be high and impair the spinneret face contamination prevention effect, whereas if the blow-out pressure is too high, it will cause swinging of discharged filaments and lead to an increased Uster unevenness.
  • the use of a circular type cooling apparatus to apply radial outward cooling air to the filaments is preferred because oligomer components formed from the polyamide discharged from the spinneret and the steam that seals the spinneret face will be prevented from retaining inside the spinning apparatus and will be released outside.
  • An outward blow type circular cooling apparatus 3 is used in the production process shown in Fig. 1 , but an inward blow type circular cooling apparatus 18 as illustrated in Fig. 5 may be used instead of the outward blow type circular cooling apparatus 3.
  • the inward blow type circular cooling apparatus 18 will be installed so as to surround the spun filaments below the spinneret center and serve to apply cooling air from outside toward inside of the spun filaments, thereby rapidly cooling the single filaments at a uniform distance from the spinneret face to cause their solidification.
  • the cooling start distance that is, the distance (L) from the spinneret face to the top of the cooling air blow-out portion of the circular type cooling apparatus, is 10 to 70 mm, more preferably 10 to 60 mm, and still more preferably 10 to 50 mm. If the cooling start distance is too short, the cooling air blown out of the circular type cooling apparatus hits the spinneret face to lower the temperature of the spinneret face, and accordingly, the discharge stability of the thermoplastic polymer will deteriorate, leading to increased breakage and fuzzing of the spun filaments. If the cooling start distance is too long, the polyamide will start to solidify before the start of rapid, uniform cooling by cooling air, and accordingly, the fineness variation (Uster unevenness) tends to increase in the yarn's length direction, resulting in cloth with poor quality.
  • the flow speed of the cooling air from the circular type cooling apparatus is 15 to 60 m/min, more preferably 20 to 55 m/min, and still more preferably 25 to 50 m/min. If the flow speed of the cooling air is too low, uniform rapid cooling of the single filaments will not be achieved sufficiently, and the tension on the cooled filaments will be small. Accordingly, swing of the filaments tends to be caused easily by outside disturbances, leading to increased Uster unevenness. Furthermore, the polymer can come in contact with the guide before being cooled adequately, and accordingly, fuzzing and breakage of spun filaments will take place frequently, resulting in cloth with inferior quality. If the flow speed of the cooling air is too high, each single filament will suffer from excessive tension to cause slight vibration of the filament, leading to increased Uster unevenness and frequent filament breakage during spinning.
  • the temperature of the cooling air from the circular type cooling apparatus is 5 to 50°C, more preferably 10 to 40°C, and still more preferably 15 to 35°C. If the temperature of the cooling air is too low, the temperature in the heat retaining zone under the spinneret will fall and the temperature of the spinneret face will also fall, often leading to a decrease in the strength of the filaments, whereas if the temperature of the cooling air is too high, uniform cooling of the filaments will become difficult and the filaments will not be cooled sufficiently, often leading to increased Uster unevenness and frequent filament breakage during spinning.
  • the vertical length of the cooling air supply portion of the circular type cooling apparatus is 100 to 500 mm, more preferably 150 to 400 mm, and still more preferably 200 to 350 mm. If the length of the cooling air supply portion is too large, each single filament will suffer from increased tension to cause breakage of spun filaments, whereas if the length of the cooling air supply portion is too small, the single filaments will receive a finishing oil before being cooled adequately, possibly leading to decreased fuzzing and breakage of spun filaments.
  • the single filaments After passing the circular type cooling apparatus, the single filaments can be subjected to treatment by a circular finishing oil supply apparatus.
  • the circular finishing oil supply apparatus is located inside the spun filaments running on circular circumstances.
  • Fig. 4 is a conceptual diagram illustrating an example of a circular finishing oil supply apparatus used favorably for the present invention.
  • This circular finishing oil supply apparatus 4 contains a finishing oil-discharging slit 12 and a disk-like guide 13.
  • the circular finishing oil supply apparatus 4 is installed so that the fiber filaments (single yarns) 14 coming from the circular type cooling apparatus are in contact with the disk-like guide 13.
  • a circular finishing oil-discharging slit 12 is formed along the outer circumference of the disk-like guide 13 so that a finishing oil is supplied to positions directly above the contact points of the disk-like guide 13 with the yarns.
  • the finishing oil is fed from a finishing oil feed pipe 17 to a finishing oil liquid pool 15.
  • the finishing oil filling the finishing oil pool 15 is then discharged through the finishing oil-discharging slit 12 and comes in contact with each single yarn at the contact point with the yarn on the disk-like guide 13, thus lubricating each single yarn.
  • the bringing of the single filaments coming from the circular type cooling apparatus into contact with the disk-like guide is preferred because swinging of the single filaments receiving cooling air is prevented and uniform cooling of the single filaments is promoted, leading to decreased Uster unevenness.
  • the use of a circular finishing oil supply apparatus that gives a finishing oil to each single filament before the bundling of the filaments by discharging the finishing oil through a finishing oil-discharging circular slit that is located directly above the contact points of the disk-like guide with the filaments and along the outer circumference of the guide is preferred because this can effectively prevent unlubricated yarns with high frictional resistance from coming in contact with the disk-like guide and depress fuzzing due to rubbing of unlubricated single filaments with each other during the bundling of filaments, and this also serves for uniform lubrication of single filaments which cannot be achieved by the finishing oil supply from the bundle-guide type finishing oil supply apparatus, thus preventing fuzzing due to rubbing of unlubricated single filaments with the yarn guide during the spinning process as
  • the circular finishing oil supply apparatus is located so as to supply a finishing oil at a position 300 to 1,000 mm, more preferably 350 to 700 mm, and still more preferably 400 to 600 mm, from the spinneret face. If the finishing oil supply position is too high, the finishing oil will be supplied before the single filaments have been cooled adequately, possibly causing filament strength deterioration and fuzzing, whereas if it is too low, an increased distance will be required from the discharge of single filaments from the spinneret face to their bundling point, and accordingly, this will cause swinging of filaments, fuzzing, increased Uster unevenness, and increased air dragging by single filaments, leading to increased tension on running filaments and breakage of spun filaments.
  • finishing oil there are no specific limitations on the type of finishing oil to be supplied by the circular finishing oil supply apparatus, but it is preferable that the finishing oil is of an emulsion type.
  • An emulsion finishing oil can easily form a film on the guide due to surface tension, permitting uniform finishing oil supply along the circumference of the disk-like guide.
  • the circular finishing oil supply apparatus 4 It is difficult for the circular finishing oil supply apparatus 4 to obtain yarns lubricated uniformly in the length direction although it, although the circular finishing oil supply apparatus 4 can supply a finishing oil uniformly among single filaments, but the two-stage finishing oil supply by the bundle-guide type finishing oil supply apparatus 5, which serves for uniform lubrication in the length direction, and the circular finishing oil supply apparatus 4 permits uniform lubrication both among single filaments and in their length direction, making it possible to provide ultrafine polyamide yarn that ensures high post-dyeing quality.
  • the bundle-guide type finishing oil supply apparatus used for the second-stage lubrication may adopt a common type finishing oil supply guide, and for instance, a finishing oil supply guide as shown in patent document 3 is preferred.
  • the filament take-up speed of the take-up roller 7 is 3,500 to 4,500 m/min. If the take-up speed is too low, the orientation of the polyamide in the length direction will be unstable and uneven dyeing will take place in the length direction, whereas if the take-up speed is too high, the filaments will suffer from large tension, possibly causing fuzzing and breakage of spun filaments. It is preferable that the draw ratio for the drawing roller 8 is 1.0 to 1.3. If the draw ratio is too high, the resulting yarn will be too low in elongation percentage, and in addition, breakage of single filaments will cause fuzzing easily.
  • the ultrafine polyamide yarn according to the present invention is required to have a single filament fineness of 0.1 dtex or more and 0.5 dtex or less, preferably 0.25 to 0.45 dtex. If the fineness of the single filaments is too large, the filaments will have an excessively high rigidity and when woven or knitted into a fabric, it will be difficult to obtain a woven or knitted fabric with required high softness, smoothness, drape properties, high water absorption ability, and high density, whereas if the fineness of the single filaments is too small, breakage of single filaments will take place frequently during cloth production, and the resulting cloth will tend to suffer from fuzzing and inferior smoothness as well as increased Uster unevenness, leading to cloth with inferior post-dyeing quality. The fineness of single filaments should be measured by the method described later.
  • the average number of fuzzes per 12,000 m of filaments in the length direction should be 1.0 or less.
  • An average number of fuzzes of larger than 1.0 will lead to fuzzing caused by warping during weaving or knitting, and breakage of threads during false twisting, as well as poor reelability, and furthermore, woven or knitted fabrics produced from them will be poor in smoothness and quality.
  • the average number of fuzzes per 12,000 m in the length direction is 0.5 or less, more preferably 0.
  • fuzzes To reduce the number of fuzzes, it is preferable to prevent unlubricated single filaments with large frictional resistance from rubbing each other and to supply a finishing oil from a circular finishing oil supply guide before bundling of filaments.
  • the average number of fuzzes should be measured by the method described later.
  • yarns have a variation in yarn fineness in the length direction, and thicker portions of yarns tend to be dyed more strongly during dyeing. In particular, this occurs more significantly in the case of single filaments with small fineness.
  • Yarns with large fineness unevenness will lead to woven or knitted fabrics with poor appearance due to decreased dyeing uniformity, and therefore, it is preferable that the Uster unevenness (fineness unevenness) is 1.0% or less. If the Uster unevenness is too large, the yarns will suffer from a large variation in smoothness and color depth during dyeing, and products produced will tend to be poor in quality. It is preferable that the Uster unevenness is 0.9% or less.
  • preferable methods include rapid cooling by bringing a cooling air blow-out apparatus closer to the spinneret face, and supply of annular flow of cooling air to yarns from outer circumference and /or inner circumference.
  • a more preferable method is to cool single filaments uniformly by supplying annular flow of cooling air from the inner circumference of the filaments, followed by bringing the single filaments in contact with a disk-like guide to prevent swinging of the filaments.
  • the Uster unevenness should be measured by the method described later.
  • the ultrafine polyamide yarn according to the present invention contains single filaments with a circular cross section, it is preferable that the orientation parameter of the surface portion of those yarns and the orientation parameter of their central portion differ from each other. If the orientation parameter differs between the surface portion and the central portion, the refractive index will differ between light passing through the central portion and that through the surface portion of the ultrafine polyamide fiber, and consequently, anti-see-through property can be developed despite the circular cross section. Specifically, it is preferable that the ratio of the orientation parameter of the surface portion of a single filament to the orientation parameter of the central portion of the single filament is 1.10 or more, more preferably 1.15 or more and 2.00 or less, and still more preferably 1.20 or more and 1.80 or less.
  • the ratio of the orientation parameter of the surface portion of a single filament to the orientation parameter of its central portion is in the above range, light passing in the cross-sectional direction of the single filament undergoes diffuse reflection and therefore, cloth produced from such single filaments will have anti-see-through property. In addition, excessively large strain will not occur in the internal structure of the yarn, serving to maintain adequate filament strength.
  • the orientation parameter should be measured by the method described later. Ultrafine polyamide yarn with such orientation parameter values can be produced under preferred conditions as described above where the cooling start distance is not too large while the flow speed of the cooling air (cooling air speed) is not too low.
  • the ultrafine polyamide yarn according to the present invention has a very small single filament fineness, and fiber in which the orientation parameter structure of the surface portion differs from the orientation parameter structure of the central portion can be obtained by cooling melt-spun yarns uniformly and rapidly.
  • the ratio of the orientation parameter of the surface portion to the orientation parameter of the central portion tends to increase when cooling conditions serving for more rapid and uniform cooling are adopted.
  • this ultrafine polyamide yarn has an elongation percentage of 40 to 70%. If the elongation percentage is too low, the tensile resistance of filaments will increase, leading to a decrease in the actual number of twists that are added by false-twisting and making it difficult to produce textured yarn with adequate crimps. In addition, drawn yarns will tend to suffer from yarn breakage and fuzzing and deteriorate in high-order passage capability.
  • the elongation percentage should be measured by the method described later.
  • the stress required for 15% elongation of the resulting ultrafine polyamide yarn is 1.0 to 2.0 gf/dtex (9.8 ⁇ 10 -3 to 19.6 ⁇ 10 -3 N/dtex), more preferably 1.2 to 1.8 gf/dtex (11.8 ⁇ 10 -3 to 17.6 ⁇ 10 -3 N/dtex). If the stress at 15% elongation is too small, the tension caused during a false-twisting process will be too small, often causing breakage of textured yarns, fluctuation in processing tension, quality deterioration of textured yarns, and decreased yield.
  • the ultrafine polyamide yarn according to the present invention has a total fineness of 15 to 300 dtex, more preferably 15 to 200 dtex. If the total fineness is too small, the breaking strength of the yarn will be too small, leading to cloth with an excessively small tearing strength, whereas if the total fineness is too large, dyes will not penetrate easily into the fiber during dyeing and uneven dyeing will remain after dyeing, making it difficult to obtain high-quality cloth.
  • the total fineness should be measured by the method described later.
  • the ultrafine polyamide yarn according to the present invention has a filament number of 30 or more, more preferably 30 to 500, still more preferably 50 to 400. If the filament number is less than 30, it will be difficult to obtain an intended high softness, drape property, high water absorption capacity, and high density, whereas if the filament number is to large, it will lead to difficulty in uniform interlacing, deterioration in reelability, and difficulty in uniform finishing oil supply to filaments, resulting in fuzzing attributable to breakage of single yarns.
  • the cross-sectional shape of the ultrafine polyamide yarn according to the present invention may have, for instance, either a circular cross section or a modified cross section.
  • Applicable modified cross sections include, for instance, oblate cross section, lens-shaped cross section, trilobal cross section, hexalobal cross section, so-called multilobar cross section such as modified cross section containing 3 to 8 convex portions and the same number of concave portions, hollow cross section, and other generally known modified cross-sections.
  • the circular cross section is preferable from the viewpoint of spinning stability, high softness, and drape property imparting capability.
  • the ultrafine polyamide yarn has a circular cross section with a preferable orientation parameter ratio between the central portion and the surface portion as described above, light passing in the cross-sectional direction of the single yarn will undergo diffuse reflection due to differences in orientation structure, whereas if it has a trilobal cross section, multilobar cross section, or hollow cross section, light passing through the surface undergo diffuse reflection. Thus, they are preferable because cloth produced will have good anti-see-through property due to diffuse reflection of transmitted light.
  • a trilobal cross section, a multilobar cross section, and a mixture of filaments with a multilobar cross section and those with a circular cross section are preferred because they serve to produce cloth containing many gaps among single filaments, leading to large water absorption capacity attributable to capillarity effect as well as high bulk density. They are also preferred because they can impart anti-see-through property attributable to diffuse reflection of transmitted light.
  • the resulting ultrafine polyamide yarn according to the present invention serves to produce cloth having high softness, smoothness, drape property, high water absorption capacity, high density, and high post-dyeing quality, as well as good anti-see-through property in the case of a preferred embodiment.
  • woven fabrics produced from the ultrafine yarn according to the present invention is preferred as high heat-insulating lightweight material for outerwear such as down jacket. Knitted fabrics serve favorably for production of luxurious underwear having good functions as listed above as well as covered yarns for tights.
  • a specimen (filament) of 27 decitex or less was wound 1,000 times and a specimen of 28 decitex or more was wound 500 times to prepare skeins, which were dried in a hot air drier at 105 ⁇ 2°C for 60 min and weighed to on a balance, followed by calculating the total fineness from the measurements using the following equation (i) or (ii). The total fineness thus calculated was divided by the number of single filaments to determine the single filament fineness.
  • Single filament fineness (dtex) total fineness (dtex) / number of single filaments
  • Area ratio of cross section A area of crosss section A / area of cross section A + area of cross section B
  • Area ratio of cross section B area of crosss section B / area of cross section A + area of cross section B
  • Single filament fineness dtex for cross section A in combined filament yarns total fineness dtex ⁇ area ratio of cross section A / number of filaments of cross section A
  • Single filament fineness dtex for cross section B in combined filament yarns total fineness dtex ⁇ area ratio of cross section B / number of filaments of cross section B
  • Maluti-Point Fray Counter MFC-200 F-type sensor unit supplied by Toray Engineering Co., Ltd. (presently, TMT MACHINERY, INC.) was used under conditions including fuzz length setting (distance from sensor light axis center to U-Guide bottom) of 2.0 mm, yarn speed of 600 m/min, and measuring time of 20 min. After confirming that the yarn feeding tension is in the range of 0.25 g/dtex to 0.75 g/dtex, 10 measurements were made and their average was taken as the average number of fuzzes (per 12,000 m).
  • the orientation parameter was measured for specimens (single filament) with a circular cross section by Raman spectroscopy using T-64000 supplied by Jobin Yvon/Atago Bussan Co., Ltd., under the following conditions: measuring mode of microscopic Raman, objective lens magnification of ⁇ 100, beam diameter of 1 ⁇ m, light source of Ar + laser/514.5 nm, laser power of 100 mW, diffraction grid of Single 600, 1,800 gr/mm, slit of 100 ⁇ m, and detector of CCD 1024 ⁇ 256 supplied by Jobin Yvon.
  • a test sample was embedded in resin (bisphenol epoxy resin, cured for 24 hours) and cut with a microtome at a cutting angle of 5° or less from the fiber's length direction to prepare a section specimen.
  • a section specimen with a thickness of 1.5 ⁇ m was cut out so that it passes through the center of the fiber.
  • Orientation was measured under two polarized conditions: parallel polarization ( // ) where the polarizing direction is parallel with the fiber's length direction and perpendicular polarization ( ⁇ ) where they are perpendicular to each other.
  • orientation parameter (I 1130 / I 1635 ) // / (I 1130 / I 1635 ) ⁇ .
  • a laser beam was applied to a point 1 ⁇ m inner from the surface portion of a single filament for the orientation parameter of the surface portion and a point in the central portion of a single filament for the orientation parameter of the central portion, and the measurements made were used for orientation parameter calculation.
  • the ratio of the orientation parameter of the surface portion to the orientation parameter of the central portion was calculated by the following equation.
  • orientation parameters of the surface and the central portion five single yarns were selected at random from the filaments and the average of their measurements was used.
  • Orientation parameter ratio orientation parameter of surface portion of single filament / orientation parameter of central portion of single filament
  • the Uster unevenness (1/2 inert, U%) was measured by using Uster Tester UT-4 supplied by Zellweger Uster under the following measuring conditions: yarn speed of 50 m/min, S-twist, twisting rate of 8,000 rpm, measuring time of 3 min.
  • Cloth was produced from the resulting fiber and dyed, and then it was subjected to tactile and visual tests for softness, surface smoothness, drape property, and depth of the color of cloth, and evaluated according to the following four-rank criteria.
  • the resulting yarn was used for both warp and weft to produce a plain weave fabric with a pick length of 180 cm.
  • the cloth was dyed with an acidic dye (Mitsui Nylon Black GL).
  • the dyed plain weave fabric was evaluated by 10 testers using a see-through cloth inspecting machine. A 100 m portion in the length direction was inspected and relative evaluation was conducted according to the following criteria.
  • a tube knit fabric was produced from the resulting yarn and inspected by 10 testers. After scouring, the anti-see-through property of the fabric was evaluated according to the following criteria.
  • a nylon 66 material with a 98% sulfuric acid relative viscosity of 2.63 is melted at 285°C, supplied to a melt-spinning pack, and discharged from an spinneret provided with 98 circular holes.
  • the single filaments are passed through a steam blow-out zone where steam is blown out toward the spinning spinneret face at a pressure of 0.25 kPa, then passed through a stand-alone, outward blow type circular cooling apparatus provided with a cooling air supply portion that is located on the downstream side of the steam blow-out zone, has a cooling start distance of 30 mm, and has a vertical length of 300 mm, and solidified as they are cooled by cooling air at 20°C supplied radially outward at a flow speed of 40 m/min.
  • an emulsion finishing oil was supplied at a position 500 mm from the spinneret face by a circular finishing oil supply apparatus having a disk-like guide portion that is in contact with the single filaments at its outer circumferential portion and also having a circular finishing oil-discharge slit that is located directly above the guide portion and along the outer circumference of the guide, and the filaments are subjected to second-stage lubrication and bundled by a bundle-guide type finishing oil supply apparatus.
  • nylon 66 fiber 40 dtex/98 filaments and 45% elongation percentage.
  • the resulting raw fiber (ultrafine polyamide fiber) and cloth were subjected to characteristics evaluation. Results are given in Table 1.
  • nylon 66 is abbreviated as N66.
  • nylon 6 is abbreviated as N6.
  • Example 1 Except for using an spinneret provided with 268 circular holes, the same spinning procedure as in Example 1 was carried out to provide nylon 66 yarn of 40 dtex/268 filaments. The resulting raw yarn and cloth were subjected to characteristics evaluation. Results are given in Table 1.
  • Example 1 Except for using an spinneret provided with 82 circular holes, the same spinning procedure as in Example 1 was carried out to provide nylon 66 yarn of 40 dtex/82 filaments. The resulting raw yarn and cloth were subjected to characteristics evaluation. Results are given in Table 1.
  • Example 1 Except that the cooling air blow-out portion of the outward blow type circular cooling apparatus installed on the downstream side of the steam blow-out zone under the spinneret had a vertical length of 100 mm and that a finishing oil was supplied by the circular finishing oil supply apparatus at a position 300 mm below the spinneret, the same spinning procedure as in Example 1 was carried out to provide nylon 66 yarn of 40 dtex/98 filaments. The resulting raw yarn and cloth were subjected to characteristics evaluation. Results are given in Table 1.
  • Example 1 Except that a nylon 66 material with a 98% sulfuric acid relative viscosity of 2.63 was melted at 275°C, the same spinning procedure as in Example 1 was carried out to provide nylon 66 yarn of 40 dtex/98 filaments. The resulting raw yarn and cloth were subjected to characteristics evaluation. Results are given in Table 1.
  • Example 1 Example 2
  • Example 3 Example 4
  • Example 5 Example 6
  • Cross section shape - circular circular circular circular circular circular circular circular Polymer - N66 N6 N66 N66 N66 N66
  • Example 2 Except that an spinneret provided with 42 circular holes was used and that the fineness was 17 dtex, the same spinning procedure as in Example 1 was carried out to provide nylon 66 yarn of 17 dtex/42 filaments. The resulting raw yarn and cloth were subjected to characteristics evaluation. Results are given in Table 2.
  • Example 2 Except that an spinneret provided with 680 circular holes was used and that the fineness was 280 dtex, the same spinning procedure as in Example 1 was carried out to provide nylon 66 yarn of 280 dtex/680 filaments. The resulting raw yarn and cloth were subjected to characteristics evaluation. Results are given in Table 2.
  • Example 2 Except that an spinneret provided with 32 circular holes was used and that the fineness was 15 dtex, the same spinning procedure as in Example 1 was carried out to provide nylon 66 yarn of 15 dtex/32 filaments. The resulting raw yarn and cloth were subjected to characteristics evaluation. Results are given in Table 2.
  • Example 2 Except that a nylon 6 material with a 98% sulfuric acid relative viscosity of 2.63 was melted at 255°C, fed to a melt-spinning pack, and discharged from an spinneret provided with 98 discharge holes each having a slit with a trilobal cross section as shown in Fig. 2 , the same spinning procedure as in Example 1 was carried out to provide nylon 6 yarn of 40 dtex/98 filaments having a trilobal cross section. The resulting raw yarn and cloth were subjected to characteristics evaluation. Results are given in Table 2.
  • Example 10 Except for using a 98-hole spinneret provided with 49 discharge holes each having a hexalobal cross section as shown in Fig. 3 and the same number of coexisting circular holes, the same spinning procedure as in Example 10 was carried out to provide nylon 6 yarn of 40 dtex/98 filaments in which hexalobal and circular cross sections coexist. The resulting raw yarn and cloth were subjected to characteristics evaluation. Results are given in Table 2.
  • Example 1 Total fineness dtex 17 280 15 40 40 Filament number - 42 680 32 98 98 Single filament fineness dtex 0.40 0.41 0.47 0.41 circular 0.39 / hexalobal 0.42 Cross section shape - circular circular circular trilobal circular/ hexalobal combined Polymer - N66 N66 N66 N6 N6 Cooling apparatus - outward blow type circular cooling apparatus outward blow type circular cooling apparatus outward blow type circular cooling apparatus outward blow type circular cooling apparatus outward blow type circular cooling apparatus Polymer temperature °C 285°C 285°C 285°C 255°C 255°C Spinneret-cooling apparatus distance mm 30 mm 30 mm 30 mm 30 mm 30 mm 30 mm 30 mm 30 mm Cooling air speed m/min 40m/min 40m/min 40m/min 40 m/min 40 m/min Cooling air supply length mm 300 mm 300 mm 300 mm 300 mm 300 mm 300 mm 300 mm 300 mm 300
  • Example 3 Except that the yarns were interlaced first, taken up at 3,000 m/min, drawn at a draw ratio of 1.50, and wound up at 4,300 m/min under relaxing conditions, the same spinning procedure as in Example 1 was carried out to provide nylon 66 yarn of 40 dtex/98 filaments. The resulting raw yarn and cloth were subjected to characteristics evaluation. Results are given in Table 3.
  • Example 3 Except for passing the yarns through a stand-alone, inward blow type circular cooling apparatus provided with a cooling air supply portion with a vertical length of 300 mm instead of an outward blow type circular cooling apparatus, the same spinning procedure as in Example 1 was carried out to provide nylon 66 yarn of 40 dtex/98 filaments. The resulting raw yarn and cloth were subjected to characteristics evaluation. Results are given in Table 3.
  • Example 3 Except that the cooling start distance was 20 mm, the same spinning procedure as in Example 1 was carried out to provide nylon 66 yarn of 40 dtex/98 filaments. The resulting raw yarn and cloth were subjected to characteristics evaluation. Results are given in Table 3.
  • Example 3 Except that the cooling start distance was 40 mm, the same spinning procedure as in Example 1 was carried out to provide nylon 66 yarn of 40 dtex/98 filaments. The resulting raw yarn and cloth were subjected to characteristics evaluation. Results are given in Table 3.
  • Example 3 Except that the cooling start distance was 10 mm, the same spinning procedure as in Example 1 was carried out to provide nylon 66 yarn of 40 dtex/98 filaments. The resulting raw yarn and cloth were subjected to characteristics evaluation. Results are given in Table 3.
  • Example 12 Example 13
  • Example 14 Example 15
  • Example 16 Total fineness dtex 40 40 40 40 40 Filament number - 98 98 98 98 98 Single filament fineness dtex 0.41 0.41 0.41 0.41 0.41
  • Cross section shape - circular circular circular circular circular circular Polymer - N66 N66 N66 N66 N66
  • Cooling apparatus outward blow type circular cooling apparatus inward blow type circular cooling apparatus outward blow type circular cooling apparatus outward blow type circular cooling apparatus outward blow type circular cooling apparatus Polymer temperature °C 285°C 285°C 285°C 285°C 285°C 285°C Spinneret-cooling apparatus distance mm 30 mm 30 mm 30 mm 20 mm 40 mm 10 mm
  • Example 2 Except that the cooling start distance was 60 mm, the same spinning procedure as in Example 1 was carried out to provide nylon 66 yarn of 40 dtex/98 filaments. The resulting raw yarn and cloth were subjected to characteristics evaluation. Results are given in Table 4.
  • Example 2 Except that the flow speed of the cooling air at 20°C sent radially outward from the outward blow type circular cooling apparatus was 27 m/min, the same spinning procedure as in Example 1 was carried out to provide nylon 66 yarn of 40 dtex/98 filaments. The resulting raw yarn and cloth were subjected to characteristics evaluation. Results are given in Table 4.
  • Example 2 Except that the flow speed of the cooling air at 20°C sent radially outward from the outward blow type circular cooling apparatus was 49 m/min, the same spinning procedure as in Example 1 was carried out to provide nylon 66 yarn of 40 dtex/98 filaments. The resulting raw yarn and cloth were subjected to characteristics evaluation. Results are given in Table 4.
  • Example 2 Except that the flow speed of the cooling air at 20°C sent radially outward from the outward blow type circular cooling apparatus was 17 m/min, the same spinning procedure as in Example 1 was carried out to provide nylon 66 yarn of 40 dtex/98 filaments. The resulting raw yarn and cloth were subjected to characteristics evaluation. Results are given in Table 4.
  • Example 2 Except that the flow speed of the cooling air at 20°C sent radially outward from the outward blow type circular cooling apparatus was 58 m/min, the same spinning procedure as in Example 1 was carried out to provide nylon 66 yarn of 40 dtex/98 filaments. The resulting raw yarn and cloth were subjected to characteristics evaluation. Results are given in Table 4.
  • Example 17 Example 18
  • Example 19 Example 20
  • Example 21 Total fineness dtex 40 40 40 40 40 Filament number - 98 98 98 98 98 Single filament fineness dtex 0.41 0.41 0.41 0.41 0.41
  • Cross section shape - circular circular circular circular circular circular Polymer - N66 N66 N66 N66 N66
  • Cooling apparatus outward blow type circular cooling apparatus outward blow type circular cooling apparatus outward blow type circular cooling apparatus outward blow type circular cooling apparatus outward blow type circular cooling apparatus outward blow type circular cooling apparatus Polymer temperature °C 285°C 285°C 285°C 285°C 285°C 285°C Spinneret-cooling apparatus distance mm 60 mm 30 mm 30 mm 30 mm 30 mm 30 mm
  • Example 2 Except that yams were discharged from an spinneret provided with 160 circular holes and that the fineness was 15 dtex, the same spinning procedure as in Example 1 was carried out to provide nylon 66 yarn of 15 dtex/160 filaments. The resulting raw yarn and cloth were subjected to characteristics evaluation. Results are given in Table 5.
  • Example 5 Except that the fineness was 56 dtex, the same spinning procedure as in Example 1 was carried out to provide nylon 66 yarn of 56 dtex/98 filaments. The resulting raw yarn and cloth were subjected to characteristics evaluation. Results are given in Table 5.
  • Example 2 Except that a disk-like guide that did not have a finishing oil-discharging circular slit was provided at a position 500 mm from the spinneret face located vertically below the outward blow type circular cooling apparatus and that finishing oil supply was not performed for the single filaments that were maintained in contact with the disk-like guide, the same spinning procedure as in Example 1 was carried out to provide nylon 66 yarn of 40 dtex/98 filaments. The resulting raw yarn and cloth were subjected to characteristics evaluation. Results are given in Table 5.
  • Example 2 Except that polyethylene terephthalate resin was melted at 290°C and then fed to a melt-spinning pack, the same spinning procedure as in Example 1 was carried out to provide polyethylene terephthalate yarn of 40 dtex/98 filaments. The resulting raw yarn and cloth were subjected to characteristics evaluation. Results are given in Table 5.
  • Example 2 Except that a unidirectional type uniflow chimney was used as the cooling apparatus and that the yarns were bundled and lubricated by a finishing oil supply guide, the same spinning procedure as in Example 1 was carried out to provide nylon 66 yarn of 40 dtex/98 filaments. The resulting raw yarn and cloth were subjected to characteristics evaluation. Results are given in Table 5.
  • Example 2 Except that a finishing oil was supplied by a circular finishing oil supply apparatus and then the yarns were bundled without being subjected to a second-stage finishing oil supply, the same spinning procedure as in Example 1 was carried out to provide nylon 66 yarn of 40 dtex/98 filaments. The resulting raw yarn and cloth were subjected to characteristics evaluation. Results are given in Table 5.

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  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
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Claims (10)

  1. Fil de polyamide comprenant des filaments individuels ultrafins ayant une finesse de filament de 0,10 dtex ou plus et 0,50 dtex ou moins, le nombre moyen de bourre étant de 1 ou moins pour 12 000 m dans le sens de la longueur du fil.
  2. Fil de polyamide tel que défini dans la revendication 1, dans lequel l'irrégularité Uster dans le sens de la longueur du fil est de 1 % ou moins.
  3. Fil de polyamide tel que défini dans la revendication 1 ou 2, ayant une finesse totale de 15 à 300 dtex et comportant 30 filaments ou plus.
  4. Fil de polyamide selon l'une quelconque des revendications 1 à 3, dans lequel les filaments ont une section transversale modifiée.
  5. Fil de polyamide selon l'une quelconque des revendications 1 à 3, dans lequel les filaments individuels contenus dans les fibres de polyamide présentent une section transversale de filament circulaire, les paramètres d'orientation des filaments individuels ayant une section transversale circulaire étant tels que le rapport entre le paramètre d'orientation de la partie de surface du filament individuel sur le paramètre d'orientation de la partie centrale du filament individuel est de 1,10 ou plus.
  6. Procédé de filage par fusion pour un fil de polyamide comprenant des filaments individuels ultrafins ayant une finesse de filament de 0,10 dtex ou plus et 0,50 dtex ou moins, et ayant une moyenne d'une bourre ou moins par 12 000 m dans le sens de la longueur des filaments, caractérisé en ce des filaments filés par fusion déchargés à partir d'une filière de filage munie de trous d'évacuation disposés de manière circonférentielle dans la partie circonférentielle extérieure de la filière de filage sont refroidis par un dispositif de refroidissement situé au-dessous de la partie centrale de la filière de filage, et conçu pour refroidir les filaments filés par fusion en appliquant de l'air de refroidissement à partir de l'intérieur ou de l'extérieur des filaments filés par fusion déchargés depuis les trous d'évacuation, une huile de finition étant fournie par un dispositif d'alimentation en huile de finition circulaire ayant une partie de guidage en forme de disque qui est située verticalement au-dessous du dispositif de refroidissement et qui est en contact avec les filaments individuels au niveau de sa partie circonférentielle extérieure, et ayant aussi une fente de décharge d'huile de finition circulaire qui est située directement au-dessus de la partie de guidage et disposée le long de la circonférence extérieure du guide, les filaments étant ensuite mis en faisceau par un dispositif d'alimentation en huile de finition de type guide de faisceau tout en recevant une alimentation en huile de finition de second étage.
  7. Procédé de filage à chaud pour un fil de polyamide tel que défini dans la revendication 6, dans lequel le dispositif de refroidissement est conçu pour refroidir les filaments filés par fusion en alimentant de l'air de refroidissement depuis l'intérieur des filaments filés par fusion déchargés depuis les trous d'évacuation.
  8. Procédé de filage par fusion pour un fil de polyamide tel que défini dans la revendication 6 ou 7, dans lequel le dispositif de refroidissement satisfait aux exigences suivantes :
    (1) la distance (L) à partir de la face de la filière de filage jusqu'à la position de début de refroidissement du dispositif de refroidissement se présente comme suit : 10 mm ≤L ≤70 mm,
    (2) l'air de refroidissement fourni au niveau de la position de début de refroidissement a une vitesse d'écoulement de 15 à 60 m/min.
  9. Dispositif de fusion par filage qui est conçu pour un fil de polyamide comprenant des filaments individuels ultrafins ayant une finesse de filament de 0,10 dtex ou plus et 0,50 dtex ou moins et ayant une moyenne d'une bourre ou moins par 12 000 m dans le sens de la longueur, et qui comprend un filière de filage munie de trous d'évacuation disposés de manière circonférentielle dans la partie circonférentielle extérieure de la filière de filage, et un dispositif de refroidissement situé au-dessous de la partie centrale de la filière de filage et destiné à refroidir les filaments filés par fusion en appliquant de l'air de refroidissement depuis l'intérieur ou l'extérieur des filaments filés par fusion déchargés des orifices de décharge, et comprend en outre un dispositif d'alimentation en huile de finition circulaire ayant une partie de guidage en forme de disque qui est située verticalement au-dessous du dispositif de refroidissement et qui est en contact avec les filaments individuels au niveau de sa partie circonférentielle extérieure, et ayant aussi une fente de décharge d'huile de finition circulaire qui est située directement au-dessus de la partie de guidage et disposée le long de la circonférence extérieure du guide, ainsi qu'un dispositif d'alimentation en huile de finition de type guide de faisceau situé sous celle-ci et destiné à mettre en faisceau les filaments tout en effectuant une alimentation en huile de finition de second étage.
  10. Dispositif de filage par fusion pour un fil de polyamide selon la revendication 9, dans lequel le dispositif de refroidissement est conçu pour refroidir les filaments filés par fusion en alimentant de l'air de refroidissement depuis l'intérieur des filaments filés par fusion déchargés depuis les trous d'évacuation.
EP11844483.5A 2010-11-29 2011-11-21 Fil de polyamide contenant des filaments ultrafines et procédé et dispositif de filage à l'état fondu pour la production de ce fil Not-in-force EP2647746B1 (fr)

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US20130251992A1 (en) 2013-09-26
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