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
  • D02G1/002—Producing crimped or curled fibres, filaments, yarns, or threads, giving them latent characteristics by knitting, weaving or tufting, fixing and then unravelling
• • 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
  • D02G1/02—Producing crimped or curled fibres, filaments, yarns, or threads, giving them latent characteristics by twisting, fixing the twist and backtwisting, i.e. by imparting false twist
  • D02G1/0206—Producing crimped or curled fibres, filaments, yarns, or threads, giving them latent characteristics by twisting, fixing the twist and backtwisting, i.e. by imparting false twist by false-twisting
• • D—TEXTILES; PAPER
  • D02—YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING
  • D02J—FINISHING OR DRESSING OF FILAMENTS, YARNS, THREADS, CORDS, ROPES OR THE LIKE
  • D02J1/00—Modifying the structure or properties resulting from a particular structure; Modifying, retaining, or restoring the physical form or cross-sectional shape, e.g. by use of dies or squeeze rollers
  • D02J1/22—Stretching or tensioning, shrinking or relaxing, e.g. by use of overfeed and underfeed apparatus, or preventing stretch
  • D02J1/221—Preliminary treatments
• • D—TEXTILES; PAPER
  • D02—YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING
  • D02J—FINISHING OR DRESSING OF FILAMENTS, YARNS, THREADS, CORDS, ROPES OR THE LIKE
  • D02J1/00—Modifying the structure or properties resulting from a particular structure; Modifying, retaining, or restoring the physical form or cross-sectional shape, e.g. by use of dies or squeeze rollers
  • D02J1/22—Stretching or tensioning, shrinking or relaxing, e.g. by use of overfeed and underfeed apparatus, or preventing stretch
  • D02J1/229—Relaxing
• • D—TEXTILES; PAPER
  • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
  • D04B—KNITTING
  • D04B1/00—Weft knitting processes for the production of fabrics or articles not dependent on the use of particular machines; Fabrics or articles defined by such processes
  • D04B1/22—Weft knitting processes for the production of fabrics or articles not dependent on the use of particular machines; Fabrics or articles defined by such processes specially adapted for knitting goods of particular configuration

Definitions

• the invention relates to a texturing process for the production of dyed, crimp yarns from endless filaments by the false-twist method.
• the endless filaments consist of synthetic polymers, such as high-molecular weight linear polyamides or high-molecular weight linear polyesters.
• the process is carried out by making up the endless synthetic filaments issuing from a spinning station by knitting into a tubular structure, being dyed in that form, the filaments then being stretched and false-twist-crimped.
• the knitting machine required to produce the tube is arranged immediately beneath the spinning station.
• the falsetwisting is effected at temperatures of above 100 C.
• This invention relates to a process for the production of dyed crimp yarns from fully synthetic endless filaments, in which the filaments are dyed after spinning from the duct and are then further processed into crimp yarn.
• the completed crimp yarn is dyed either after texturing in strand form or making up in soft cross-wound bobbins (muff), or before texturing on cross-wound bobbins.
• Polyamide and polyester fibres are usually dyed after texturing since, with these materials, dyeing before texturing results in a poor yarn yield because the crystallinity of the material is increased under the eflect of the heat-treatment during dyeing and the filament is fully shrunk.
• polyacrylonitrile yarns are dyed before texturing.
• Twisting before the skein is made up is absolutely essential because it is extremely difficult to finish yarn that has been dyed in single yarn form (monofilaments) in the skein inasmuch as the material becomes tangled and gives rise to difficulties in take-off.
• Moderately elastic crimp yarns are used in the manufacture of outer clothing. With such materials, the following operations are involved:
• finishing the special dye packages in the case of single yarn dyeing involves numerous yarn brea'kages and hence difficulties. Accordingly, it is also standard practice with plied yarn processing, to carry out the twisting operation before the special dye package is prepared and to dye the plied yarn in twisted form.
• dyed and undyed material can only be processed in combination with one another if the undyed material has also been fully shrunk before texturing.
• a process for the production of dyed crimp yarns by the false-twist method has now been found in which hitherto-essential operations can be eliminated, providing the endless filaments issuing from the extrusion spinnerette are made up into a knitted tubular structure, are dyed in this tubular form, and are then stretched and false-twistcrimped in a single operation. Dyed and undyed material can also be processed in admixture with one another, be cause the residual shrinkage after texturing is the same in both yarns.
• the spun material is made up and dyed in tubular form. This spun material can be stretched and crimped in a single operation on the false twist texturing machine.
• the knitting machine required to produce the tube is arranged immediately beneath the spinning duct.
• EXAMPLE 1 A 140-denier with 18 filaments polyamide crimp yarn of moderate elasticity is required for use in knitting to produce a knitted article (Wevenit). It is spun with a spinning denier of 427 denier and directly made up into a tubular structure on a l-gg knitting machine. This tubu lar structure is dyed by the creel method and stretched on a texturing machine with 2 texturing zones in a stretching ratio of 13.2 at 1800 r.p.m./160 C. and false-twistcrimped at 150 C. with an overfeed of 4% at 2000' t./m.
• EXAMPLE 2 A moderately elastic 90* denier 4-plied crimp yarn of polyamide-6 is required for use in the cotton sector. It is spun with a denier of 315 denier and directly made up into a tubular structure on a knitting machine. After dyeing in the tubular structure, the yarn is stretched on a texturing machine with 2 texturing zones in a ratio of 113.12 at 1600 revolutions/150 C. and then false-twist crimped at 160 C. and 3000 t./m. with an overfeed of 9%. This material is twisted and coned in 4-plied form.
• a 90 denier polyamide crimp yarn is required for use in the production of highly elastic sock yarns. It is spun with a denier of 315 denier and directly made up into tubular form. This material is dyed in tubular structure. After stretching in a ratio of 1:3.5 on a standard drawing machine, the yarn is false-twisted at 3000 t./m. at 180 C. under a 6 overfeed on a standard false-twist machine.
• EXAMPLE 4 A 240 denier polyacrylonitrile crimp yarn is required for the production of outer clothing. It is used in a spinning denier of 860' denier. This material is made up into a tubular structure on a 10-gg knitting machine and then dyed. After dyeing, the tubular structure is fed directly to a false-twist texturing machine incorporating a stretching frame, stretched in a stretching ratio of 1:5.5 at 160 C. and then false-twisted at 1560 t./m. at 170 C. with a 3% overfeed.
• a process for the production of dyed crimp yarns from fully synthetic endless filaments by the false-twist method which comprises extruding endless filaments from an extrusion spinnerette, knitting the same into a tubular structure, dyeing the filaments in said tubular structure and then stretching and false-twist crimping said filaments.

Landscapes

• Engineering & Computer Science (AREA)
• Textile Engineering (AREA)
• Mechanical Engineering (AREA)
• Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
• Knitting Of Fabric (AREA)
• Coloring (AREA)
• Artificial Filaments (AREA)

Applications Claiming Priority (1)

Publications (1)

Family

ID=5714742

Family Applications (1)

Country Status (8)

Cited By (3)

Families Citing this family (3)

• 1968
  • 1968-11-29 DE DE19681811718 patent/DE1811718B2/de active Pending
• 1969
  • 1969-10-20 CH CH1565469A patent/CH513258A/de not_active IP Right Cessation
  • 1969-10-22 GB GB51743/69A patent/GB1247747A/en not_active Expired
  • 1969-11-20 US US378563*[A patent/US3611701A/en not_active Expired - Lifetime
  • 1969-11-25 JP JP44093976A patent/JPS4830020B1/ja active Pending
  • 1969-11-27 BE BE742313A patent/BE742313A/xx unknown
  • 1969-11-27 NL NL6917868A patent/NL6917868A/xx unknown
  • 1969-11-28 FR FR6941260A patent/FR2024589A1/fr not_active Withdrawn

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