EP0098477B1 - Procédé de filage à sec continu de fibres et de filaments d'acrylonitrile - Google Patents

Procédé de filage à sec continu de fibres et de filaments d'acrylonitrile Download PDF

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Publication number
EP0098477B1
EP0098477B1 EP83106170A EP83106170A EP0098477B1 EP 0098477 B1 EP0098477 B1 EP 0098477B1 EP 83106170 A EP83106170 A EP 83106170A EP 83106170 A EP83106170 A EP 83106170A EP 0098477 B1 EP0098477 B1 EP 0098477B1
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EP
European Patent Office
Prior art keywords
spinning
filaments
process according
weight
stretching
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EP83106170A
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German (de)
English (en)
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EP0098477A1 (fr
EP0098477B2 (fr
Inventor
Ulrich Dr. Reinehr
Hans Dr. Uhlemann
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Bayer AG
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Bayer AG
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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
    • D01F6/02—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from homopolymers obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • D01F6/18—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from homopolymers obtained by reactions only involving carbon-to-carbon unsaturated bonds from polymers of unsaturated nitriles, e.g. polyacrylonitrile, polyvinylidene cyanide
    • 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
    • D01D5/04—Dry spinning methods

Definitions

  • the invention relates to a continuous process for producing crimped threads and fibers from acrylonitrile polymers with at least 40% by weight of acrylonitrile units.
  • a “continuous process” is understood to mean that the threads are spun, stretched, crimped, shrunk, fixed and optionally cut into staple fibers in one operation without interruption using the dry spinning method.
  • Acrylic fibers are usually manufactured using wet spinning, dry spinning and melt spinning technologies. While continuous processes have already become known in the production of acrylic fibers by the wet spinning and melt spinning technique, for example the wet spinning process according to Textile Technology 26 (1976), pages 479-483 or the melt extrusion process according to DE-A 2 627 457, which have no restriction Regarding the strip weights, only a continuously working process for the production of acrylic fibers after the dry spinning process has become known which can only be used for multifilament yarns with low strip weights, so-called acrylic silk, and under which certain conditions have to be fulfilled (US Pat. No. 2,811,409 ). This process is not suitable for the production of acrylic cables with high tape weights.
  • the wet spinning process in which the spinning solution is spun into a precipitation bath, where it coagulates to form threads which are washed, drawn, dried and prepared without interrupting the process, nozzles with a large number of holes of approximately 10,000 are used.
  • the spinning speed is relatively low at 5 to 20 m / min.
  • the dry spinning process is therefore interrupted before drawing, the spinning material is collected in cans, from which it is then fed to further post-treatment (Bela von Falkai, Synthesefaser, Verlag Chemie, Weinheim / Deerfield Beach, Florida / Basel (1981), p. 204 -206; R. Wiedermann, acrylic fiber spinning and post-treatment processes in man-made fibers / textile industry, June 1981, pp. 481-484, especially p. 482 left column above).
  • a batch process is e.g. B. from DE-A 1 494 553, in which work is carried out with take-off speeds of over 300 m / min and a stretching factor of 1: 4.5.
  • the threads After leaving the spinning shaft, the threads are provided with an aqueous, antistatic preparation. After the process has been interrupted, the threads are drawn, washed and finished in the usual way.
  • the object of the present invention to provide a continuous process for the production of acrylic fibers by the dry spinning method, in which all process stages of the thread formation to the ready-to-ship fiber take place in one work process without any interruption or intermediate storage, and which can be applied to spinning cables with high strip weights.
  • the preparation of the spinning solution should be able to be integrated into the continuous process.
  • the spinning delay of the method is preferably greater than 2, in particular it is between 2 and 12.
  • the spinning solution at 100 ° C. has a viscosity of 15 to 50 falling ball seconds (6.56 to 21.85 Pa.s)
  • the solvent content of the threads when leaving the spinning shaft is max. 20% by weight, in particular max. 10 wt .-%, based on the fiber solids content
  • the strip temperature during stretching is 100 to 180 ° C.
  • the stretching ratios are in particular between 2 and 12, 3 to 6 for copolymers and 12 to 12 for homopolymers being the preferred range.
  • the method according to the invention it is possible to produce spinning tow with a ribbon weight of 100,000 dtex and more with such a low content of residual solvent that after hot stretching and a subsequent crimping and shrinking process, the residual solvent content in the finished fiber or in the continuous cable is clearly below 1% by weight lies without the spinning material having come into contact with an extracting agent for the spinning solvent, apart from the water content of the spinning preparation.
  • the threads obtained according to the invention have fiber strengths of over 2 cN / dtex.
  • Suitable acrylonitrile polymers are all acrylonitrile homopolymers and copolymers which can be spun into so-called acrylic fibers or modacrylic fibers, preferably acrylonitrile copolymers with at least 85% by weight of acrylonitrile units. Homopolymers and terpolymers made from 89 to 95% by weight of acrylonitrile, 4 to 10% by weight of a nonionic comonomer and 0.5 to 3% by weight of an ionogenic comonomer are particularly preferred, the comonomers being methyl acrylate, methyl methacrylate and Vinyl acetate and on the other hand methallyl sulfonate and styrene sulfonate are preferred. The polymers are known.
  • the process according to the invention differs from the process of US Pat. No. 2,811,409 in that the spinning solution has a different viscosity, which should not be less than 400 poise at 100 ° C., corresponding to 91 ball falling seconds at 100 ° C., individual examples also being 300 poise go down corresponding to 69 falling ball seconds, and due to the delay, which is mostly between 0.5 and 1.5. Examples with higher delays have extremely high viscosities. As mentioned, the process is limited to very low strip weights and requires a complicated spinning shaft.
  • the method according to the invention is preferably carried out with a spinning shaft, in which the hot air used to evaporate the spinning solvent is blown in at the head of the spinning shaft, at most 50 cm below the spinneret, in the longitudinal and / or transverse direction to the threads.
  • the spinning material ie. H. the spinning tow leaving the spinning shaft has a residual solvent content of less than 40% by weight, in particular between 2 and 10% by weight, based on the dry fiber weight, because spun material with residual solvent contents of more than 40% by weight, for example of dimethylformamide, sticks during subsequent hot stretching over godets at strip temperatures above 120 ° C. If, to avoid this, one stays at strip temperatures below 100 ° C, then an undesirable cold expansion of the material takes place, i. H. an uneven and imperfect stretching under not exactly defined conditions, the stretching degree being limited to a maximum of 3: 1.
  • the spun material with residual solvent contents below 40% by weight can be stretched over godets or into a steaming zone without sticking and tearing at belt temperatures of up to 180 ° C
  • a preparation that contains a lubricant and an antistatic, and to stretch it hot without cooling The lubricant allows perfect stretching of even thick cables of 100,000 dtex and more.
  • the preparation can also contain water as an ingredient, but care must be taken that the cable does not absorb more than 10% by weight of moisture. If the cable contains large amounts of water, it cools down strongly and unevenly, and during the subsequent hot stretching, no faulty stretching is achieved despite the high stretching temperatures of 200 ° C. and more.
  • the cable shows tears or wraps on the godets.
  • Suitable lubricants are glycols, their derivatives, silicone oils, ethoxylated fatty acids, alcohols, esters, amides, alkyl ether sulfates, and mixtures thereof.
  • the preparation can contain a corresponding commercially available preparation, for example a customary cation-active, anion-active or nonionic compound, such as a long-chain ethoxylated, sulfated and neutralized alcohol.
  • the preparation expediently has a temperature of 50-90 ° C. in order to prevent the hot thread sheet from cooling.
  • the manhole tapes spun by a spinning machine with, for example, 20 spinning shafts and having a total titer of 100,000 dtex or more are prepared in this way, bundled and fed via a take-off device to a pair of rollers which can be heated inductively to over 200 ° C.
  • a clamping point is produced by looping the pair of rollers one or more times, if necessary by means of an additional roller.
  • a coolable withdrawal quintet or septet serves as the second clamping point, which is arranged at a distance of approx. 3 m from the inductively heated pair of rollers and causes the cable to be stretched by a correspondingly higher speed.
  • the cooling of the rollers on the second stretching member is necessary in order to avoid caking and rigidity which are observed in the case of acrylic fibers at temperatures above about 130 ° C.-140 ° C. in the subsequent crimping process.
  • the spinning solvent residues escaping during hot drawing are suctioned off and recovered via a cooling system.
  • Septet rollers which are heatable at the beginning and coolable at the end have proven to be preferred stretching members.
  • a tube heated with superheated steam or hot air can advantageously be integrated between the septet rollers.
  • spinning take-off speeds of 50-100 m / min are completely sufficient to keep the residual solvent content in the spun material clearly below 10% by weight, so that at speeds of 300-1000%, final speeds of 150 to 1000 m / min are achieved are technically manageable.
  • the cable is then crimped in a stuffer box or fed at speeds above 300-400 m / min to a high-performance texturing nozzle, in which crimping is preferably carried out with the aid of superheated steam of at least 105 ° C.
  • the crimped cable is relaxed with saturated steam, superheated steam or even in dry heat for shrinkage removal, for example over a wire belt or U-tubular steaming boots.
  • the shrunk cable is then packaged or cut into staple fibers and pressed into bales as required.
  • the process is particularly suitable for the production of spun-dyed threads and fibers by adding soluble dyes, in particular cationic dyes or pigments, to the spinning solution, because when the color is changed due to the special work-up, considerably less rejects are obtained.
  • the method according to the invention is also suitable for the continuous production of bicomponent threads and fibers, in which the post-treatment steps are modified accordingly in accordance with the known technology for bicomponent threads.
  • dimethylformamide (DMF) are mixed in a kettle at room temperature with stirring, with 300 kg of an acrylonitrile copolymer made from 93.6% acrylonitrile, 5.7% methyl acrylate and 0.7% sodium methallylsulfonate with a K value of 81.
  • the suspension is pumped via a gear pump into a spinning kettle equipped with an agitator. Then the suspension is heated in a double-walled tube with steam of 4.0 bar. The dwell time in the tube is 5 minutes.
  • the spinning solution which has a temperature of 138 ° C at the tube outlet and a viscosity of 19 falling ball seconds (8.30 Pa - s), measured at 100 ° C, is cooled to 90 ° C after leaving the heating device, filtered and directly a spinning system with 20 spinning shafts.
  • the spinning solution is dry spun from 1264 perforated nozzles, nozzle hole diameter 0.2 mm, with a take-off speed of 50 m / min and a spin delay of 7.2.
  • the dwell time of the spinning threads in the spinning shafts is 5 seconds.
  • the shaft temperature is 200 ° C and the air temperature is 350 ° C.
  • the air volume that is passed through is 40 m 3 / h for each shaft, which is blown in at the top of the shaft in the longitudinal directions to the threads.
  • the spinning material with a total titer of 310,000 dtex, which still has a residual solvent content of 11.1% by weight, based on the solids content, is treated with an aqueous, oil-containing, antistatic preparation of this type immediately after leaving the spinning shafts with an 80-90 ° C. warm wets that the oil content of the threads is 0.16% by weight, the antistatic content is 0.04% by weight and the moisture is 1.1% by weight, based on the fiber solids content.
  • the preparation is dosed via gear pumps.
  • the warm cable is then sent over a pair of rollers heated inductively to 200 ° C, with a contact time of approx. 2 seconds being achieved by looping several times over a feed roller.
  • the cable assumes a strip temperature of 156 ° C, measured with the KT 15 radiation thermometer.
  • the cable is stretched by 500%, with a stretch septet with coolable rollers serving as the second clamping point.
  • the strip temperature after the stretching process is 80 ° C.
  • the cable is crimped in a stuffer box and relaxed in a tube which is fed with saturated steam.
  • the dwell time in the steam pipe is approx. 4 minutes.
  • the fully shrunk cable is then cut into staple fibers with a cutting length of 60 mm, blown and fed to a packing press.
  • the acrylic fibers produced in this way in a continuous process have a single fiber final titer of 3.3 dtex.
  • the fiber strength is 3.4 cN / dtex and the elongation is 48%.
  • the fibers are completely vacuole-free, have a density of 1.181 g / cm 3 and a completely smooth, structureless fiber surface.
  • Yarns made from the fibers on a high-performance card at 140 m / min have a yarn strength of 17.5 RKm, an elongation of 19.4% and a yarn boiling shrinkage of 2.2%.
  • the following table shows the running method for different degrees of stretching and strip temperatures for spinning material with the same total titer 310,000 dtex with different DMF contents.
  • the various DMF contents in the spinning material were produced by varying the shaft, air temperature, air volume and the dwell time in the spinning shaft.
  • the table for residual solvent contents in the spun material above approx. 40% by weight, it is no longer possible to achieve reasonable modes of operation with sufficient fiber strengths.
  • the spun material cakes or is only stretched cold.
  • a spinning solution according to Example 1 is dry spun from 380 perforated nozzles, nozzle hole diameter 0.2 mm, with a take-off speed of 166.6 m / min and a spin delay of 5.7.
  • the dwell time of the spinning threads in the spinning shafts is 1.5 seconds.
  • the shaft temperature is 160 ° C and the air temperature is 300 ° C, the throughput of air is 40 m 3 / h for each shaft.
  • the viscosity of the spinning solution is again 19 ball falling seconds (8.30 Pa ⁇ s), measured at 100 ° C.
  • the filaments with a total titre of 118,000 dtex, which still have a residual solvent content of 39.4% by weight of DMF, are sprayed with an aqueous, oil-containing, antistatic 80-90 ° C. preparation inside the lower shaft closures.
  • the oil content of the threads is 0.18% by weight
  • the antistatic content is 0.04% by weight
  • the moisture content is 1.9% by weight, based on the solids content.
  • the warm cable is again warmed, as described in Example 1, stretched 3.6 times with a belt temperature of 133 ° C, cooled via septet rollers and crimped with a belt temperature of 66 ° C and relaxed in a tube with saturated steam.
  • the shrunk cable is then cut into staple fibers with a cutting length of 60 mm, blown and fed to a packing press.
  • the acrylic fibers produced in this way by a continuous process have a single fiber denier of 5.0 dtex.
  • the strength is 2.1 cN / dtex and the elongation is 39%.
  • the density is 1.182 g / cm 3 .
  • the fiber surface is completely smooth and streak-free.
  • Yarns made from the fibers on the high-performance card at 130 m / min have a yarn strength of 12.2 RKm, an elongation of 19.4% and a yarn boil shrinkage of 3.0%. 8 Gev
  • a spinning solution according to Example 1 is dry spun from 1264 hole nozzles, hole diameter 0.2 mm, with a take-off speed of 125 m / min and a spinning delay of 6.3.
  • the dwell time of the spinning threads in the spinning shafts is 2 seconds.
  • the shaft temperature is 200 ° C and the air temperature is 350 ° C.
  • the throughput of air is 40 m 3 / h for each shaft.
  • the viscosity of the spinning solution is again 19 ball falling seconds (8.30 Pa - s), measured at 100 ° C.
  • the cable is stretched in the steam pipe by 900%, with a stretch septet with coolable rollers serving as the second clamping point.
  • the cable is crimped through a blowing nozzle with superheated steam at 140 ° C and relaxed on a sieve belt with hot air at 190 ° C.
  • the residence time is 2.5 minutes.
  • the escaping residual solvent vapors are recovered via an extraction system and a cooling system.
  • the shrunk cable is then cut into staple fibers with a cutting length of 60 mm and fed to a pack press.
  • the acrylic fibers produced in this way in a continuous process have a single fiber final titer of 1.9 dtex.
  • the fiber strength is 4.7 cN / dtex and the elongation is 13%.
  • the fibers are completely vacuole-free and have a density of 1.181 g / cm 3 .
  • Yarns made from the fibers on a high-performance card at 140 m / min have a yarn strength of 22.7 RKm, an elongation of 17.5% and a yarn boiling shrinkage of 2.3%.
  • Example 755 kg of dimethylformamide (DMF) were mixed in a kettle at room temperature with stirring, with 245 kg of an acrylonitrile homopolymer having a K value of 91.
  • the suspension is dissolved, filtered and fed directly to a spinning plant with 20 spinning chutes.
  • the viscosity of the spinning solution measured at 100 ° C, is 38 falling seconds (16.6 Pa - s).
  • the spinning solution is dry spun from 380 perforated nozzles, nozzle hole diameter 0.2 mm, with a take-off speed of 41.6 m / min and a spin delay of 4.8.
  • the dwell time of the spinning threads in the spinning shafts is 6 seconds.
  • the shaft and air temperatures correspond to the information in Example 1.
  • the air volume is 45 m 3 / h.
  • the acrylic fibers produced in this way in a continuous process have a final fiber titer of 1.6 dtex, a fiber strength of 5.2 cN / dtex and an elongation of 11%.
  • the fibers are completely vacuole-free and have a density of 1.184 g / cm 3 .
  • Yarns made from the fibers on the high-performance card at 120 m / min have a yarn strength of 24.7 RKm, a yarn elongation of 14.6% and a yarn boiling shrinkage of 3.4%.
  • a spinning solution according to Example 1 is dry spun from 1264 perforated nozzles, nozzle hole diameter 0.2 mm, with a take-off speed of 208.3 m / min and a spin delay of 7.2.
  • the dwell time of the spinning threads in the spinning shafts is 1.2 seconds.
  • the shaft temperature is 160 ° C and the air temperature is 260 ° C.
  • the air volume is 35 m 3 / h for each shaft.
  • the cable is glued and there are constant ramps and tears in the stretching area on the rollers and the idler roller.
  • a further increase in temperature up to 240 ° C, with a measured strip temperature of 204 ° C, as well as a reduction in the degree of stretching does not improve the running behavior.
  • the material can be stretched again 1: 5 and continuously treated to fibers in the manner described in Example 1.
  • the fibers have a single fiber final titer of 4.5 dtex and a fiber strength of only 1.3 cN / dtex with an elongation of 123%.
  • a cold expansion of the cable containing a lot of residual solvent If the stretching is carried out over septet rolls with an intermediate steam tube under the conditions as described in Example 3, the same results are obtained.
  • a spinning solution according to Example 1 is, as described there, dry spun from 1264 perforated nozzles.
  • the subsequent stretching process as described in Example 1, only a strip temperature of 86 ° C is reached. The stretching area is constantly torn off, so that continuous post-treatment was not possible.
  • Example 6 Another part of the spun material from Example 6 is again drawn by 500% at a roll temperature of 240 ° C.
  • the belt temperature is 139 ° C.
  • the cable is then crimped directly in a stuffer box without cooling and, as described in Example 1, relaxed.
  • the cable is baked streaky and has a water rigidity. After cutting, there are large amounts of undissolved cut bandages.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Artificial Filaments (AREA)
  • Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)

Claims (10)

1. Procédé pour produire des fils et fibres à partir de polymères de l'acrylonitrile comportant au moins 40% en poids de motifsacrylonitrile, dans un mode opératoire en continu, par filage d'une solution du polymère à filer dans une zone de filage, évaporation d'au moins une partie de la solution de filage dans la zone de filage, préparation, étirage, frisage, fixage et éventuellement découpage, caractérisé en ce que:
a) on file une solution à filer dont la viscosité à 100° C est de 10 à 60 s de chute de bille (4,37 à 26,22 Pa . s),
b) on règle l'évaporation du solvant dans la zone de filage de manière que la teneur en solvant des fils, lorsqu'ils quittent la zone de filage, soit au maximum de 40% en poids par rapport à l'extrait sec des fibres,
c) on munit les fils, avant leur étirage, d'une préparation qui contient un lubrifiant et un agent anti électricité statique et l'on confère aux fils une teneur en humidité d'au maximum 10% en poids, par rapport à l'extrait sec des fils, et
d) pendant la totalité du procédé, les fils ne viennent en contact d'aucun autre liquide, destiné à extraire le solvant de filage, que l'eau de la préparation.
2. Procédé selon la revendication 1, caractérisé en ce que le taux d'étirage au filage est, pour le procédé, supérieur à 2.
3. Procédé selon la revendication 1, caractérisé en ce que la solution à filer présente une viscosité correspondant à 15 à 50 s de chute de bille à 100°C (6,56 à 21,85 Pa - s), la teneur en solvant des fils, lorsqu'ils quittent la zone de filage, est au maximum de 20% en poids, par rapport à l'extrait sec des fibres, et la temperature du ruban lors de l'étirage est de 100 à 180° C.
4. Procédé selon la revendication 3,caractérisé en ce que le rapport d'étirage est de 2 à 12.
5. Procédé selon la revendication 1, caractérisé en ce que la préparation de la solution de filage est incorporée au procédé continu.
6. Procédé selon la revendication 5, caractérisé en ce que la solution de filage est préparée par polymérisation en solution dans le solvant utilisé pour le filage.
7. Procédé selon la revendication 1, caractérisé en ce qu'on ajoute à la solution de filage des colorants solubles ou des pigments et l'on produit des fils et fibres teints au filage.
8. Procédé selon la revendication 1, caractérisé en ce qu'on effectue l'étirage avec des câbles d'au moins 100 000 dtex.
9. Procédé selon la revendication 1, caractérisé en ce que, l'on insuffle à la tête de la zone de filage, à 50 cm au maximum au-dessous de la buse de filage, dans le sens longitudinal et/ou transversal des fils, de l'air chaud servant à évaporer le solvant de filage.
10. Procédé selon la revendication 1, caractérisé en ce que, en cas de vitesses supérieures à 300 m/min, on effectue le frisage dans une buse éjectrice en utilisant de la vapeur surchauffée à 105° C au moins.
EP83106170A 1982-07-06 1983-06-24 Procédé de filage à sec continu de fibres et de filaments d'acrylonitrile Expired - Lifetime EP0098477B2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19823225266 DE3225266A1 (de) 1982-07-06 1982-07-06 Kontinuierliches trockenspinnverfahren fuer acrylnitrilfaeden und - fasern
DE3225266 1982-07-06

Publications (3)

Publication Number Publication Date
EP0098477A1 EP0098477A1 (fr) 1984-01-18
EP0098477B1 true EP0098477B1 (fr) 1985-12-04
EP0098477B2 EP0098477B2 (fr) 1992-07-01

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EP83106170A Expired - Lifetime EP0098477B2 (fr) 1982-07-06 1983-06-24 Procédé de filage à sec continu de fibres et de filaments d'acrylonitrile

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US (1) US4457884A (fr)
EP (1) EP0098477B2 (fr)
JP (1) JPS5921711A (fr)
DE (2) DE3225266A1 (fr)

Families Citing this family (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3308657A1 (de) * 1983-03-11 1984-09-20 Bayer Ag, 5090 Leverkusen Kontinuierliches verfahren zur herstellung von polyacrylnitrilfaeden und -fasern
DE3418943A1 (de) * 1984-05-22 1985-11-28 Bayer Ag, 5090 Leverkusen Verfahren zur herstellung von faeden und fasern aus acrylnitrilpolymerisaten
DE3515091A1 (de) * 1985-04-26 1986-10-30 Bayer Ag, 5090 Leverkusen Vorrichtung zum benetzen von faeden, folien oder fadenscharen mit fluessigkeiten und ihre verwendung
DE3634753A1 (de) * 1986-09-05 1988-03-17 Bayer Ag Kontinuierliche spinnverfahren fuer acrylnitrilfaeden und -fasern mit daempfung des spinngutes
JPS6366318A (ja) * 1986-09-05 1988-03-25 バイエル・アクチエンゲゼルシヤフト アクリロニトリルのフイラメント又は繊維の連続紡糸法
DE3630244C2 (de) * 1986-09-05 1994-06-16 Bayer Ag Kontinuierliches Trockenspinn- und Nachbehandlungsverfahren des Spinngutes für hochschrumpffähige Acrylnitrilfäden und -fasern und entsprechende Fäden und Fasern
DE3631905A1 (de) 1986-09-19 1988-03-31 Bayer Ag Stauchkammerkraeusel und verfahren zur herstellung von gekraeuselten synthetischen fasern
DE3926857A1 (de) * 1988-09-28 1990-04-05 Bayer Ag Pan-trockenspinnverfahren erhoehter spinnschachtleistung mit ueberhitztem dampf als spinngasmedium
US5015428A (en) * 1988-09-28 1991-05-14 Bayer Aktiengesellschaft Pan dry spinning process of increased spinning chimney capacity using superheated steam as the spinning gas medium
DE3832872A1 (de) * 1988-09-28 1990-04-05 Bayer Ag Trockenspinnverfahren mit heissluft bei spinnschachtleistungen groesser 20 kg pro schacht und stunde
DE3832870A1 (de) * 1988-09-28 1990-03-29 Bayer Ag (kontinuierliche) herstellung von acrylnitrilfaeden und -fasern aus restloesungsmittelarmem spinngut
SE8904065L (sv) * 1988-12-07 1990-06-08 Hitachi Ltd Metod att foerbaettra egenskaperna hos svetsare paa austenitiskt rostfritt staal
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US4457884A (en) 1984-07-03
DE3361408D1 (en) 1986-01-16
DE3225266A1 (de) 1984-01-12
EP0098477A1 (fr) 1984-01-18
EP0098477B2 (fr) 1992-07-01
JPS5921711A (ja) 1984-02-03
JPH0413442B2 (fr) 1992-03-09
DE3225266C2 (fr) 1990-11-08

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