Classifications

• • D—TEXTILES; PAPER
  • D02—YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING
  • D02G—CRIMPING OR CURLING FIBRES, FILAMENTS, THREADS, OR YARNS; YARNS OR THREADS
  • D02G1/00—Producing crimped or curled fibres, filaments, yarns, or threads, giving them latent characteristics
  • D02G1/18—Producing crimped or curled fibres, filaments, yarns, or threads, giving them latent characteristics by combining fibres, filaments, or yarns, having different shrinkage characteristics
• • D—TEXTILES; PAPER
  • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
  • D01G—PRELIMINARY TREATMENT OF FIBRES, e.g. FOR SPINNING
  • D01G1/00—Severing continuous filaments or long fibres, e.g. stapling
  • D01G1/06—Converting tows to slivers or yarns, e.g. in direct spinning
  • D01G1/08—Converting tows to slivers or yarns, e.g. in direct spinning by stretching or abrading

Definitions

• the invention relates to a method for producing a tear pull by conventional spinning, post-treatment and tearing, the individual fibers of which have a cooking shrinkage of at least 35%.
• Yarns made from such single fibers are used in numerous article areas, e.g. B. in velor or fur imitation area used.
• the yarn is produced by spinning single fibers, which are usually obtained by cutting shrinkable fiber strands.
• Such a method is e.g. B. described in DE-OS 2 655 172.
• gentle drying must be carried out at temperatures below 60 ° C., which requires an undesirably long time.
• the object of the present invention was therefore the production of high-shrinkage fibers after a more economical drying process at higher temperatures, with higher strength in the shrinking yarn and the possibility of dyeing smaller batches. It has now surprisingly been found that a saturated steam fixation after stretching and before the tearing process gives a cable which meets these requirements.
• the invention therefore relates to a process for the production of high-shrinkage tears made of acrylonitrile polymers after conventional spinning, stretching and tearing, characterized in that after stretching and before tearing, saturated steam fixation is carried out between 115 and 140 ° C and the tearing at a heating zone delay (HZV ) of at least 30%.
• the steaming time is a maximum of 30 minutes.
• the heating zone of the tearing machine is preferably heated to 120 to 160 ° C.
• a cardiac output of 65% is usually not exceeded when tearing. Reless processing is advantageously carried out at a heating zone temperature of 120 to 150 ° C. and a cardiac output of 40 to 60%.
• Acrylonitrile polymers in the context of the process are polyacrylonitrile or preferably acrylonitrile copolymers with at least 50% by weight of polymerized acrylonitrile.
• Such copolymers contain one or more monomers copolymerizable with acrylonitrile, such as acrylic acid esters, vinyl esters or monomers with dye-affine groups. Dry-spun bundles of threads are preferably used.
• the threads obtained after dry spinning are passed through aqueous baths to extract the residual solvent, being drawn 2 to 6 times, preferably 2 to 3 times.
• the temperature of the aqueous baths is at most 100 ° C., preferably 65 to 75 ° C.
• the stretched threads are dried, as is usual with acrylic cables, by hot air at 140 to 150 ° C after they have been treated with a preparation necessary for further processing.
• the thread bundle is passed through a conventional stuffer box crimp.
• the cable is treated with saturated steam under pressure so that the cable is given the desired shrink height after the tear processing, i.e. the pull.
• a temperature of 115 to 140 ° C is maintained, since damage can occur at higher temperatures, which is reflected in a deterioration of the raw clay and a steaming time that is greater than 30 minutes, also in a reduction in the fineness-related maximum tensile force.
• sufficient shrinkage in the pull is no longer achieved at lower temperatures.
• the cable can be dyed using a foulard by one of the usual methods, such as pack dyeing or padding of the dye, it having no effect on the shrinkage behavior of the zipper, whether spinning or z.
• a coloring of the cable is selected in the bale.
• the dyeing is expediently carried out before the steaming step, because it is known that the dye is fixed by a steaming process.
• the shrinkage that can be achieved in the pull depends on various parameters. It has been found that the higher the comonomer content in the polymer, the lower the stretch ratio when the comonomer content is below 6% by weight, the higher the fixing temperature (saturated steam) and the higher the temperature and the HZV during the tearing process.
• the shrinking force is also important, since the shrinkage must be triggered against the resistance of the non-shrinking or less shrinking fibers. It has been shown that copolymers with a comonomer content between 6 and 10% by weight can be processed into tears with a higher shrinking force than those with a comonomer content between 2 and 6% by weight.
• the cable While supplying spray steam below 1 bar, the cable was crimped in a stuffer box and placed in a perforated can. After treatment with saturated steam at 120 ° C. in an autoclave, the cable was torn on a tearing machine (type Seydel 671 S) at a heating plate temperature of 120 ° C. and a cardiac output of 58%. The following values were found when testing the individual fibers of the tear cable:
• the fibers of the tear pull showed an average cooking shrinkage of 30%, a maximum cooking shrinkage of -36%, and the yarn spun from this yarn showed a cooking shrinkage of 38.7% with a shrinking force (180 ° C. hot air) of 5.9 mN / tex.
• An acrylonitrile polymer of the same composition as in Example 1 was spun by a conventional dry spinning process.
• the fiber bundle still contained 16.4% by weight of the solvent, which was washed out in a washing-stretching process using water at elevated temperature.
• the temperature in the washing tubs was 85 ° C, that in the stretching tubs 95 ° C.
• the speed quotient of the inlet and outlet in the washing-stretching system was 1: 5.0.
• the stretched and washed cable was then given an antistatic finish and was then steamed in a continuous pressure damper (System Tunnel, Serracant, Spain) at 120 ° C., the dwell time in the damper being 9.5 minutes.
• the hot, moist cable was dried with hot air from 140 ° C.
• Example 2 The tear pull obtained was spun into a yarn of titer 250 dtex. The yarn shrinkage was 43.4%.
• the tensile test of the shrunk yarn measured 26.0% elongation and 8.4 cN / tex tensile strength.
• a dry-spun fiber cable made of an acrylonitrile copolymer having the composition 93.6% by weight of acrylonitrile, 5.7% by weight of methyl acrylate and 0.7% by weight of sodium methallysulfonate is washed in water at 70 ° C. and at the same temperature around Stretched 5 times the initial length. The speed after the stretching process is 72 m / min. After applying an antistatic, the product is dried at max. 140 ° C with air, the outlet speed from the dryer is 25% lower than the inlet speed. Before the tear processing at a heating plate temperature of 140 ° C and a cardiac output of 44%, the 6.84 km long cable stored in a perforated can is treated with saturated steam at 125 ° C in an autoclave.

Landscapes

• Engineering & Computer Science (AREA)
• Textile Engineering (AREA)
• Mechanical Engineering (AREA)
• Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
• Artificial Filaments (AREA)
• Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
• Chemical Or Physical Treatment Of Fibers (AREA)
• Stringed Musical Instruments (AREA)

Priority Applications (1)

Applications Claiming Priority (2)

Publications (2)

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Family Applications (1)

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• 1980
  • 1980-03-15 DE DE19803010045 patent/DE3010045A1/de not_active Ceased
• 1981
  • 1981-03-04 DE DE8181101530T patent/DE3161396D1/de not_active Expired
  • 1981-03-04 EP EP81101530A patent/EP0036517B1/de not_active Expired
  • 1981-03-04 AT AT81101530T patent/ATE5334T1/de not_active IP Right Cessation
  • 1981-03-05 US US06/241,199 patent/US4434530A/en not_active Expired - Fee Related
  • 1981-03-13 ES ES500335A patent/ES500335A0/es active Granted
  • 1981-03-13 CA CA000373000A patent/CA1156413A/en not_active Expired
  • 1981-03-13 IE IE555/81A patent/IE50868B1/en unknown
  • 1981-03-13 JP JP3547581A patent/JPS56144215A/ja active Pending

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