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

Definitions

• the present invention relates to obtaining filaments based on polyamides at high speed, according to a simplified and compact process.
• the filaments can be intertwined to give cohesion to the wires and facilitate their subsequent recovery for certain applications.
• the process according to the present invention applies to the spinning of filaments based on polyhexamethylene adipamide, or on copolyamides containing at least 85% of hexsmethylene adipamide units and up to 15 other units obtained by replacing, for example the starting adipic acid with another diacid such as terephthalic, sebacic, etc., or by replacing the two monomers with caprolactam for example.
• the starting polyamides may also contain additives such as matting agents, stabilizers with respect to light, or with respect to heat, and to oxidation, additives intended to reduce the accumulation of static charges or change the dyeing ability, etc.
• the distance between the die and the point of convergence of between 55 and 70 cm is dependent on a certain number of factors in particular the strand count, the spinning speed, the blowing conditions such as the air speed , and to a lesser degree of humidity and temperature.
• the spinning speed which is the speed of the wires in the solid state, that is to say also the winding speed, is equal to or greater than 5000 m / min and can easily reach 6000 m / min or even more. It essentially depends on technological elements allowing the industrial realization of the process, in particular the winding means.
• the maximum total height between the die and the point of deposition on the reel can vary between 130 and 200 cm, that is to say that the process according to the invention can be carried out industrially on a single stage unlike conventional processes, this which allows the manipulator to have access as easily to the die as to the winder: the industrial economic interest, as much from the energy point of view as packaging and handling is therefore obvious and without common measure with conventional processes.
• the distance between the point of convergence and the winding is not a critical value, it only depends on the devices provided, between these two points, such as an interlacing nozzle for example, and the triangulation height.
• the yarns thus obtained have mechanical and shrinking properties close to those of the yarns obtained at speeds comparable to those of the high speed spinning processes currently used industrially.
• the threads according to the invention are very regular (titer, mechanical properties, shrinkage, dye affinity).
• they have good cleanliness. They can be used as is, for obtaining woven articles such as lining, protective clothing, or knitted articles (warp knitting for example), or they can be textured subsequently according to any process currently used industrially. Above all, they have a good regularity of the title and a level of cohesion appropriate for their subsequent use.
• the relative viscosity of the polyamide is measured on a solution at 8.4% by weight by volume in 90% formic acid.
• the measurement of shrinkage with boiling water is carried out on a doubled wire knotted at its end, subjected to a standard pretension of 50 mg / dtex.
• the length L o of the doubled wire is read at the knot, before treatment, on a graduated ruler, then the wire is immersed in boiling water for 15 minutes in the free state then 10 minutes in the free state in a oven at 80 ° C and left for at least 60 minutes in the free state in a standard atmosphere (65% RH and 20 ° C + 2).
• the wire is then treated for 30 minutes in a ventilated oven at 160 ° C. and it is left at least 60 minutes in the free state in a standard atmosphere.
• the linear average irregularity U% represents the variations of the mass along the controlled wire. These mass variations are located on either side around the average mass per unit length and they are measured as a function of this average, on a "OSTER type 8-11" regularimeter and an "USTER integrator, type L-13 "which allows to integrate the value of the average irregularity in percentage.
• the number of faults is measured on a commercial "Creel Mirror" device. The number of defects visible to the naked eye over a given length is counted and the number of defects is reported per 1000 km of wire.
• the cohesion factor measured on a device known commercially under the brand "Rotschild” (NPT - Type 2040), consists of an automatic detection of the distance between interlacing points using a needle placed between the filaments of a moving wire which retracts as soon as it meets a point of resistance.
• the cohesion factor is expressed by the ratio d being the average distance in cm between interlacing points, calculated on at least 100 points.
• the characteristics of the stockings are measured on a dynamometer for stockings, by the following method:
• the length L o of the sample is pretensioned without pretension.
• a load is gradually applied up to a predetermined value depending on the title of the wire and the number of stitches.
• the force / elongation curve is thus plotted and the length LM of the sample is determined under the predetermined load.
• the length LR is determined which is the length of the sample at the moment when the force is canceled (LR> L o ).
• We determine L 01 new length of the sample without pretension (L 01 > L o , but L 01 ⁇ LR because of a relaxation phenomenon).
• a second force / elongation curve is drawn which, for the predetermined load, restores the length LM. We gradually remove the load and draw the return curve.
• the length LR 1 is determined at the moment when the force is canceled, LR 1 is found to be practically equal to LR.
• the elasticity, the elastic recovery and the deformation are calculated by the following formulas:
• a polyhexamethylene adipamide is prepared, matified with 0 3% by weight of titanium oxide, protected against light with 7 ppm of manganese, and having a relative viscosity of 39 measured on a solution at 8.4% in formic acid to 90%.
• the polymer is melted at 291 ° C and extruded through a die comprising 2 series of 33 orifices with a diameter of 0.23 mm, the flow rate of the polymer is 87 g / min.
• the filaments are cooled transversely with moist air (75% relative humidity by means of a blower sending air at 50 m / min, blown transversely and then grouped into 2 wires corresponding to the 2 series of orifices.
• a polymer identical to that prepared according to Example 1 is prepared, which is spun through a die comprising two ranges of seven orifices with a diameter of 0.34 mm, in order to obtain two 7-strand wires.
• the flow rate is determined as a function of the thread calling speed (winding speed).
• the operating conditions are as follows: The characteristics of the wires obtained are given in Table IV.
• the yarn obtained in test 4 was textured under conditions comparable to those used for a pre-oriented polyamide yarn (POY) obtained industrially.
• the yarn according to the invention did not pose any problems in texturing, on the other hand, the textured spool unwinds well.
• a polyhexamethylene adipamide is prepared, matified with 0.3% by weight of titanium oxide, protected against light with 7 ppm of manganese and having a relative viscosity of 39.
• the polymer is melted at 291 ° C. and extruded through a die having 30 orifices with a diameter of 0.40 mm.
• the filaments are cooled with moist air (75% (relative) humidity) by means of a blower sending the air transversely.
• the yarns obtained have the properties gathered in Table IX.
• the winding was carried out by means of conventional winders, that is to say free of voltage regulating means.

Landscapes

• Engineering & Computer Science (AREA)
• Textile Engineering (AREA)
• Mechanical Engineering (AREA)
• Chemical & Material Sciences (AREA)
• Chemical Kinetics & Catalysis (AREA)
• General Chemical & Material Sciences (AREA)
• Artificial Filaments (AREA)
• Spinning Methods And Devices For Manufacturing Artificial Fibers (AREA)
• Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)

Applications Claiming Priority (2)

Publications (2)

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Family Applications (1)

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• 1983
  • 1983-02-16 FR FR8302627A patent/FR2540893B1/fr not_active Expired
• 1984
  • 1984-01-26 CA CA000446069A patent/CA1224612A/fr not_active Expired
  • 1984-02-13 EP EP84420026A patent/EP0118375B1/fr not_active Expired
  • 1984-02-13 DE DE8484420026T patent/DE3460584D1/de not_active Expired
  • 1984-02-14 BR BR8400705A patent/BR8400705A/pt not_active IP Right Cessation
  • 1984-02-15 ES ES529764A patent/ES529764A0/es active Granted
  • 1984-02-15 JP JP59026885A patent/JPS59157317A/ja active Granted
  • 1984-02-16 AR AR295737A patent/AR231550A1/es active
• 1987
  • 1987-07-20 US US07/075,271 patent/US4804508A/en not_active Expired - Lifetime

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