EP0099047B1 - Verfahren zum kontinuierlichen Verstrecken und Texturieren von Fäden - Google Patents

Verfahren zum kontinuierlichen Verstrecken und Texturieren von Fäden Download PDF

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Publication number
EP0099047B1
EP0099047B1 EP83106538A EP83106538A EP0099047B1 EP 0099047 B1 EP0099047 B1 EP 0099047B1 EP 83106538 A EP83106538 A EP 83106538A EP 83106538 A EP83106538 A EP 83106538A EP 0099047 B1 EP0099047 B1 EP 0099047B1
Authority
EP
European Patent Office
Prior art keywords
yarns
stretching
yarn
knit
knitting
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP83106538A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0099047A2 (de
EP0099047A3 (en
Inventor
Karl Heinrich
Norbert Heichlinger
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hoechst AG
Original Assignee
Hoechst AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hoechst AG filed Critical Hoechst AG
Publication of EP0099047A2 publication Critical patent/EP0099047A2/de
Publication of EP0099047A3 publication Critical patent/EP0099047A3/de
Application granted granted Critical
Publication of EP0099047B1 publication Critical patent/EP0099047B1/de
Expired legal-status Critical Current

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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

Definitions

  • the invention relates to a process for the continuous successive drawing and texturing of undrawn yarns, the texturing being carried out according to a known knit-decnit process.
  • the knit-decnit process is also used for special fashionable effects, in which a smooth, stretched original yarn is knitted into a tube or a web, this knitted fabric is then fixed by heat treatment and then separated again. Under these conditions, a textured yarn is created since the individual filaments try to regain the spatial arrangement that they had in the knitted fabric when they were fixed.
  • the production of the usually smooth insert yarn for the knit-Deknit process using a classic draw-twist process is complex. It therefore made sense to connect a stretching stage with a heater upstream of the knitting machine in order to achieve proper stretching of the polyester yarns before reaching the knitting machine.
  • each standstill of a thread on the heater or the heated unit means at least one change in the dyeability.
  • the dyeability of the yarn is very sensitive to the duration of the thermal treatment, so that this process cannot lead to uniform crimped yarns or large losses have to be accepted.
  • uniform heating is only guaranteed if the heating zone is long, but these must be adhered to exactly.
  • polyester yarns immediately before knitting, provided that the polyester yarns have a particularly high pre-orientation due to a birefringence of over 65-10-3 or a yield stress of over 7.5 cN / tex can be expressed.
  • polyester yarns are produced by spinning take-off speeds of over 4100, preferably over 4 400 m / min. It has been found that with these very high pre-orientation values, the otherwise necessary stretching of the polyester threads in the heat is no longer necessary, and in particular also that the knitted tubes can be handled without difficulty during fixing and also that the knitted fabric can be separated later without difficulty and without the Use of special expansion bodies or the like is possible.
  • the yield stress is understood to be the quotient of the flow force and the titer of these insert yarns.
  • the flow force can be taken from the force-strain diagram. In such a diagram, a horizontal branch of the curve is usually observed after a linear increase (reversible range) and an overshoot at the pour point. In this area there is an increase in length without a simultaneous increase in force. The height of this flow zone is called the flow force. With high pre-orientation, the flow zone shortens to a minimum, possibly to an inflection point or kink, but the height of the flow force can be determined in any case.
  • the highly pre-oriented yarn is cold drawn without supplying heat between the supply mechanisms (2) and (3) and then knitted.
  • the thread closure of the yarn can be improved by a swirling nozzle (4) between the stretching and knitting zones.
  • the knitted hoses obtained by the method according to the invention show good uniformity in the stitch pattern. Machine downtimes are visible in the stitch pattern of the knitting loop (7), but do not lead to any deviations in crimping or dye absorption in the final crimped yarn, that is to say after fixing and re-opening. that is, they are no longer detectable in the final fabric.
  • the method according to the invention proves to be particularly advantageous in the processing of plied yarns. Even sixfold yarns can be drawn evenly by cold drawing and subjected to a knit-Deknit crimp. When working with specialty yarns, it is of course particularly recommended to swirl them immediately in front of the knitting head.
  • the process according to the invention results in yarns which meet the usual quality standards and even exceed in the uniformity of the yarn properties.
  • Another advantage of the yarns produced according to the invention is their high dye absorption, which is generally significantly higher than that of the corresponding yarns which were produced from the same polymer raw material by the classic knit-deknit process.
  • each thread or each yarn must be passed before or during stretching over heated areas, the energy losses of which are extremely large. It is estimated that only an extremely small portion of the heating power of each heater is transferred to the running thread or yarn. The remaining energy heats up the work area in which this machine is located. Since such work rooms are usually air-conditioned, this means that the heating energy has to be destroyed again via the air conditioning system, which causes further energy costs.
  • the method according to the invention is particularly suitable for processing yarns made from polyethylene terephthalate, but of course it can also be used for yarns made from other high molecular weight polyesters.
  • Polyethylene terephthalate with a relative viscosity of 1.81 (measured as a 1.0% solution in phenol: tetrachloroethane in a ratio of 3: 2) was melted and pressed through a 32-hole nozzle into threads which, after cooling, were wound up at 4500 m / min.
  • the polyethylene terephthalate contained 0.04% titanium dioxide as a matting agent.
  • the filaments had a titer of 200 dtex f 32 with a flow resistance of 7.8 cN / tex and a thermal shrink 8 130 of 4.8%.
  • the thermal shrinkage "S, 30 in hot air at 130 ° C was determined in accordance with DIN 53866.
  • the thread material obtained in this way was placed in a knit-Deknit device with a stretching godet as shown in the figure and the threads were drawn off the spinning bobbins at a speed of 467 m / min.
  • the spinning threads were cold drawn between godets 2 and 3 in a drawing ratio of 1: 1.2, ie without the action of a heat source.
  • the threads had a flow resistance of 15 cN / tex with a thermal shrink 8 130 of 13% as a result of the stretching.
  • the yarn running speed to the knitting head was 560 m / min.
  • the knitting head had a 19 division; with a needle count of 240, 100 cm knitted-in length per round of knitted tube was processed in the raw, unfixed state. After steaming in an autoclave at 130 ° C, a titer of 189 dtex was measured. The crimped structure after the fixed knitted tube had been separated fully met the textile requirements for knit-Deknit texturing yarns. In particular, the typical boucle structure of the yarn textured in this way was observed. In the dyed state, the yarn showed good dyeing uniformity on and a very deep hue compared to samples made by the conventional method.
  • Threads with the 242 dtex f 32 spinning titer were produced from the same raw material as was processed in Example 1, but at a winding speed of only 3 500 m / min. Such a yarn had a flow resistance of only 5 cN / tex and an S 130 thermal shrinkage of 45%. After cold stretching in a ratio of 1.45 on the identical stretch knitting device, a flow resistance before knitting was also 15 cN / tex and a thermal shrinkage S 130 of 47.2% was measured. However, the knitted tube obtained shrank excessively when steamed and had a “board-like” character. It was still possible to cut the knitted tube, but the crimp structure was insufficient, in particular the boucle-like character was missing. The effective titer was measured after separation with 210 dtex.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
  • Knitting Of Fabric (AREA)
  • Artificial Filaments (AREA)
EP83106538A 1982-07-10 1983-07-05 Verfahren zum kontinuierlichen Verstrecken und Texturieren von Fäden Expired EP0099047B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19823225965 DE3225965A1 (de) 1982-07-10 1982-07-10 Verfahren zum kontinuierlichen verstrecken und texturieren von faeden
DE3225965 1982-07-10

Publications (3)

Publication Number Publication Date
EP0099047A2 EP0099047A2 (de) 1984-01-25
EP0099047A3 EP0099047A3 (en) 1986-10-22
EP0099047B1 true EP0099047B1 (de) 1988-11-30

Family

ID=6168211

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83106538A Expired EP0099047B1 (de) 1982-07-10 1983-07-05 Verfahren zum kontinuierlichen Verstrecken und Texturieren von Fäden

Country Status (4)

Country Link
US (1) US4769880A (da)
EP (1) EP0099047B1 (da)
DE (2) DE3225965A1 (da)
DK (1) DK156777C (da)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL8602312A (nl) * 1986-09-12 1988-04-05 Nijverdal Ten Cate Textiel Werkwijze voor het vervaardigen van een kunstgrasmat en daarmee verkregen kunstgrasmat.
US6308537B1 (en) * 2001-04-18 2001-10-30 Sue-Ping Lin Nozzle for knitting machine
WO2015000663A1 (en) * 2013-07-03 2015-01-08 Bonar B.V. Nonwoven material
US10883201B2 (en) * 2017-11-15 2021-01-05 Everest Textile Co., Ltd. Polytetrafluoroethylene textile and manufacturing method thereof

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3184820A (en) * 1963-04-29 1965-05-25 Maurice S Kanbar Apparatus for orienting the structure of synthetic yarn
US3623311A (en) * 1969-11-03 1971-11-30 Turbo Machine Co Apparatus for producing synthetic torque yarns
DE2017971B2 (de) * 1970-04-15 1976-07-29 Bayer Ag, 5090 Leverkusen Verfahren zur herstellung eines maessig elastischen bauschgarnes
FR2135892A5 (da) * 1971-04-29 1972-12-22 Roannais Constr Textiles
DE2211843A1 (de) * 1972-03-11 1973-09-20 Hoechst Ag Verwendung unverstreckter polyaethylenterephthalatfaeden
GB1409454A (en) * 1972-05-18 1975-10-08 Mitsubishi Rayon Co Method for producing crimped polyester yarns
DE2966870D1 (en) * 1978-10-27 1984-05-10 Ici Plc Improvements in or relating to gear crimped polyester yarn

Also Published As

Publication number Publication date
DK156777C (da) 1990-02-19
DK317583D0 (da) 1983-07-08
DK156777B (da) 1989-10-02
EP0099047A2 (de) 1984-01-25
DE3378589D1 (en) 1989-01-05
DE3225965A1 (de) 1984-01-12
US4769880A (en) 1988-09-13
DK317583A (da) 1984-01-11
EP0099047A3 (en) 1986-10-22

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