US2922196A - Process for the continuous manufacture of crimped threads or fibres of polymeric epsilon-caprolactam - Google Patents

Process for the continuous manufacture of crimped threads or fibres of polymeric epsilon-caprolactam Download PDF

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Publication number
US2922196A
US2922196A US416319A US41631954A US2922196A US 2922196 A US2922196 A US 2922196A US 416319 A US416319 A US 416319A US 41631954 A US41631954 A US 41631954A US 2922196 A US2922196 A US 2922196A
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United States
Prior art keywords
tow
polymeric
fibres
caprolactam
crimped
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Expired - Lifetime
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US416319A
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English (en)
Inventor
Kunz Karl
Hafner Josef
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Hoechst AG
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Hoechst AG
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    • 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
    • D02G1/12—Producing crimped or curled fibres, filaments, yarns, or threads, giving them latent characteristics using stuffer boxes
    • D02G1/127—Producing crimped or curled fibres, filaments, yarns, or threads, giving them latent characteristics using stuffer boxes including drawing or stretching on the same machine
    • 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

Definitions

  • This invention relates to a process for the continuous manufacture of crimped threads or fibres of polymeric e-caprolactam.
  • fibres are needed which have an especially marked crimp stability. Furthermore, there is often required a crimping similar to that of merino wool, which is a wool of high quality.
  • crimped threads or fibres of polymeric e-caprolactam the crimping of which corresponds to a pronounced merino crimping
  • a large number ofsingle fibers that is to say, a tow of continuous fibers
  • a lactam-containing state in which monomeric or low polymeric e-caprolactam may also be present
  • hot Water at about 80 C. to about 100 C. without tension in order to remove the low molecular portion, subsequently dried, and finally cut if so desired.
  • the polymeric e-caprolactam contains more than 6 percent advantageously about 7 to about 15 percent of monomers or low polymers.
  • the stretching process may be carried out in several stages either in the cold-at about room temperatureor also at a progressively increasing temperaturefrom about room temperature to 200 C.
  • the tow may also be heated after the cold stretching process and before a new stretching process, under tensile stress, to temperatures above 50 C., advantageously to temperatures ranging between 140 C. and 170 C.
  • the tow stretched in the cold may be after-stretched in an atmosphere of steam, advantageously at temperatures between 90 C. and 105 C., whereby a very desirable reduction of the elongation at break and an increase of the stability of the finished fibre is effected.
  • the tow is crimped mechanically, this being preferably carried out in a compression crimping apparatus that may be heatable.
  • the crimped tow is treated without tension with water at a temperature above 80 C. as described above. Besides the removal of the monomeric and low polymeric constituents from the tow, this washing process effects a fixation of the crimping and also increases the crimp stability.
  • the stability of a polyamide fibre amounts to about 45 percent, while the crimp stability of the fibre made according to the process of the present invention amounts to ice about 60-70 percent.
  • This increase of the crimp stability is particularly favourable in processing the fibres, and especially in scribbling, carding, and combing them, so that yarns are obtained which, with regard to uniformity and full hand, are equal to the best woolen yarns.
  • the crimp stability percentage is determined in the following manner: The fiber is fixed between two clamps, the distance between them being L and charged with a weight corresponding to the weight of 18 meters of the fiber.
  • the crimping degree K which corresponds to the so-called initial crimping degree of Examples 1 and 2 is then The lower one of the clamps is then removed and the fiber is charged for one minute with a weight corresponding to the weight of 5,000 meters of the fiber. The charge is then completely taken away from the fiber for one minute.
  • the crimping degree is again measured on this fiber in the same manner as described above. From these measurements the value of K (crimping degree after continuous tensile stress) is obtained.
  • the crimp stability in percentage (B) may be calculated according to the formula After washing the tow without tension, the main portion of the water is squeezed out. The tow is then prepared, if desired, and finally dried without tension. The drying without tension is carried out in known manner by laying the tow in loops on a. belt drier. If desired, the tow may be cut after drying.
  • the device for washing the mechanically crimped tow consists generally, of a tank 1, in which a container 2 is vertically inserted.
  • the container 2 tapers towards its lower end and is perforated as a sieve, and has at its lower end an opening 3 large enough to allow the tow to pass through.
  • the said apparatus comprises a turner bar 4, draw-in rollers 5, draw-0E rollers 6, and a known means (not shown), for the regular laying down of the tow in the container 2.
  • Water 8 circulates through tank 1, passing through container 2.
  • Example 1 A newly spun tow of polymeric ecaprolactam containing, besides diand trimeric lactam, also about 7 percent of monomeric lactam, and having an individual count of 11 denier and a total count of 300,000 denier, is stretched in the cold in the ratio of 113.4 and thereupon crimped mechanically in a compression crimping apparatus provided with a closed chamber. The crimped dry tow is then washed with water at 92 C. without tension in the washing device described above until free from lactam.
  • Crimping degree after continuous tensile stress percent 11.6 Crimp stability do 61.0

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
US416319A 1953-03-16 1954-03-15 Process for the continuous manufacture of crimped threads or fibres of polymeric epsilon-caprolactam Expired - Lifetime US2922196A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE328030X 1953-03-16

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US2922196A true US2922196A (en) 1960-01-26

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US (1) US2922196A (d)
CH (1) CH328030A (d)
NL (2) NL185912B (d)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3302839A (en) * 1965-03-25 1967-02-07 Du Pont Tow-diverting chute for depositing running tow on a conveyor belt

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2197896A (en) * 1937-02-15 1940-04-23 Du Pont Artificial wool
US2492574A (en) * 1945-11-19 1949-12-27 Albert Malick Apparatus for fluid treating and for guiding parallel traveling textile strands
US2575838A (en) * 1948-11-30 1951-11-20 Alexander Smith Inc Method of crimping proteinaceous fibers
US2575781A (en) * 1949-10-14 1951-11-20 Alexander Smith Inc Method of crimping textile fibers
US2669001A (en) * 1949-09-29 1954-02-16 Collins & Sikman Corp Method and apparatus for treating yarns
US2715309A (en) * 1950-05-31 1955-08-16 Rosenstein Nathan Synthetic continuous filament yarn in the continuous filament yarn state
US2733122A (en) * 1951-11-30 1956-01-31 vixvi o

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2197896A (en) * 1937-02-15 1940-04-23 Du Pont Artificial wool
US2492574A (en) * 1945-11-19 1949-12-27 Albert Malick Apparatus for fluid treating and for guiding parallel traveling textile strands
US2575838A (en) * 1948-11-30 1951-11-20 Alexander Smith Inc Method of crimping proteinaceous fibers
US2669001A (en) * 1949-09-29 1954-02-16 Collins & Sikman Corp Method and apparatus for treating yarns
US2575781A (en) * 1949-10-14 1951-11-20 Alexander Smith Inc Method of crimping textile fibers
US2715309A (en) * 1950-05-31 1955-08-16 Rosenstein Nathan Synthetic continuous filament yarn in the continuous filament yarn state
US2733122A (en) * 1951-11-30 1956-01-31 vixvi o

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3302839A (en) * 1965-03-25 1967-02-07 Du Pont Tow-diverting chute for depositing running tow on a conveyor belt

Also Published As

Publication number Publication date
NL185912B (nl)
CH328030A (de) 1958-02-28
NL106443C (d)

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