US3081593A - Method of treating synthetic yarns - Google Patents

Method of treating synthetic yarns Download PDF

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Publication number
US3081593A
US3081593A US36330A US3633060A US3081593A US 3081593 A US3081593 A US 3081593A US 36330 A US36330 A US 36330A US 3633060 A US3633060 A US 3633060A US 3081593 A US3081593 A US 3081593A
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Prior art keywords
thread
roller
yarn
yarns
twisting
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Expired - Lifetime
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US36330A
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English (en)
Inventor
Meerdink Anton Frederik George
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Akzona Inc
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American Enka Corp
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Publication date
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    • 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

Definitions

  • This invention relates generally to a method for treating yarns formed from synthetic linear polycondensation products, especially po-lyamide yarns, and more particularly to an improvement in the processing of yarn which has been drawn, thereupon subjected to a treatment for internal relaxation, and subsequently wound or collected by means of a ring-twisting spindle.
  • the apparatus is usually provided with a supply roller, a stretching or drawing roller, a de-tensioning device, a heating device positioned between said stretching roller and said detensioning device, and a-ring-twisting spindle.
  • the supply roller and the stretching roller are so coupled, for example by a motor, that the circumferential speed of the stretching roller is a few times greater than that of the supply roller.
  • the de-tensioning device may be formed by a pair of guiding rods over which the thread is passed with a light frictional engagement.
  • the force exerted by the twisting spindle cannot run back up to the stretching roller and, therefore, the thread tension between stretching roller and guiding rods becomes so small that the thread may shrink.
  • This shrinking may be accelerated by heating the thread between the stretching roller and the guiding rods.
  • Shrinking of the thread may also be brought about without guiding rods if a light traveller is used.
  • the above-mentioned shrinking of the threads causes an internal relaxation or a removal of internal strain.
  • the temperature at which the heating device is maintained depends on the threads to be treated. For threads consisting of polyamides based on adipic acid and hexamethylene diamine a heating may be considered at temperatures between 0 and 220 C. Threads consisting of polyamino caproic acid should be heated at 190 C. maximum whereas for threads from polyethylene terephthalate a maximum temperature of 220 C. is permissible.
  • the heating may take place with the aid of hot air or steam, by means of heated surfaces over which the threads to be relaxed are passed, or by applying heated inert liquids, such as hot mineral oil or molten metals through which the threads may be pulled.
  • a satisfactory heating may also be obtained with the aid of a freely rotatable metal thread guiding roller which is heated by an electrical element partly sur ounding the guiding roller at the points of thread contact.
  • Internal relaxation also may be obtained by temporarily swelling the threads.
  • said relaxation may be obtained by passing the threads to be treated through an air space over a greater than average distance before winding. This method, however, is less suitable for practical application since a greater distance is required between the stretching roller and the twisting spindle or the detensioning device, the latter being positioned in front of said spindle. See copending and commonly owned application Serial No. 708,689, filed January 13, 1958, now Patent No. 3,025,660.
  • the winding of the relaxed threads with the aid of a ring-twisting spindle preferably is carried out under a low tension, although the tension should be sufficiently high to prevent sagging of windings on the twisting pirn. In case the winding tension is too low, thread will not be easily separated from the thread conveying roller positioned immediately before the twisting spindle, which is undesirable. A minimum winding tension of 1 gram per tex. (1 tex.:9 denier), is generally required for preventing this difficulty.
  • the above-mentioned known methods are directed toward production of a yarn which does not produce the so-called barr effect when woven into fabric.
  • the presence of or the blarr effect in a fabric means that streaks of varying conspicuousness occur at regular intervals in the fabric.
  • yarn wound on pirns by the known methods may be processed in many different ways.
  • the pirns which have been obtained on the draw twisting machines are rewound on so-called washing bobbins while using other twisting machines.
  • the yarns are subjected to a treatment with hot water or steam in order to remove the twist liveliness contained therein, after which the yarn is rewound from said washing bobbins onto crosswound bobbins.
  • the present invention consists in that in the above-mentioned known method the yarns are rewound from the pirns formed on the ring-twisting spindle onto crosswound bobbins before the tendency for forming a barr effect in said yarns has developed above a perceptible level.
  • the time elapsing between Winding on the draw-twisting pirn and rewinding onto crosswound bobbins is of special importance. It has already been stated above that said period preferably should be less than 48 hours.
  • the time available for said rewinding depends on the effectiveness with which the internal relaxation of the thread is accomplished. If the latter were less intensive, for example, then it is recommended that said rewinding be carried out within a shorter time than when a very intensive relaxation of the threads has been accomplished.
  • the constant variation in length of the thread path produced by the usual draw-twisting machines mentioned is caused by vertical movement of the traversing beam of said ring-twisting machines as a result of which the height of the thread balloon between the traveller and fixedly arranged top thread guiding eyelet formed during normal operation of the ring-twisting machines mentioned is caused by vertical movement of the traversing beam of said ring-twisting machines as a result of which the height of the thread balloon between the traveller and fixedly arranged top thread guiding eyelet formed during normal operation of the ring-twisting spindle continuously increases and decreases.
  • the effect of this increase and decrease in length may be obviated in several ways.
  • a thread loop with varying length may be drawn between the last conveying roller arranged before the ringtwisting spindle and the top thread guide.
  • the increase or decrease in length of said thread loop should fully compensate the decrease or increase in balloon height.
  • top thread guide to the traversing beam for movement therewith and by supplying thread to said thread guide at an angle of preferably with the center line of the twisting spindle.
  • the thread path between said thread guide and the thread guide positioned immediately before said thread guide should be at least three times as long as the thread path between the top thread guide and the traveller.
  • Tension fluctuations in the relaxation zone that is the zone between the stretching roller and the traveller, will hardly occur in this case, as fully explained in said copending application Serial No. 708,689, now Patent No. 3,025,660.
  • Traversing of the top thread guide with the traversing beam is obtained in a simple way by fixing the guide on a support placed on the traversing beam. It is also possible, however, to couple the top thread guide and the traversing beam indirectly with respect to each other.
  • the traversing of the top thread guide with the traversing beam to which the traveller ring is fixed results in constant balloon height between the traveller and the top thread guide during the entire twisting operation. As a result, the thread tension in the balloon also remains constant.
  • a different supply direction for the thread may also be chosen, for instance, at an acute angle with said center line.
  • increases and decreases in length of the thread path occur between the stretching or drawing roller and the top thread guide unless a traversing auxiliary roller is applied.
  • This roller pulls a thread loop with varying length in said thread path in such a way that variations in length counteract the fluctuations caused by the traversing top thread guide.
  • the thread may be passed from the stretching roller upwardly to the traversing auxiliary thread guide and from there downwardly to the traversing top thread guide of the twisting spindle.
  • thread may be subjected to the relaxation treatment, for instance by being passed over a heated plate.
  • numeral 1 denotes a thread brake over which a thread 2 from a supply bobbin (not shown) is passed to a supply roller 3 driven by a motor (also not shown).
  • a pressure roller 4 is urged thereagainst and cooperates therewith in a'known manner.
  • the surface of said pressure roller consists of an elastic material, such as cork.
  • Said roller 4 is mounted in a swinging arm 5.
  • the pressure roller 4 is driven only by the supply roller 3. This operation is produced by wrapping the thread :about the pressure roller 4 over an angle greater than with the aid of a thread guide 6.
  • the thread guide is slowly traversed longitudinally of the pressure roller 4 in order to prevent an incision of the rollers.
  • thread 2 is passed over two snubbing pins 7 and subsequently is wrapped a number of times around a stretching or draw roller '8 which is rotated with a circumferential speed a few times greater than that of the supply roller 3.
  • a stretching or draw roller '8 which is rotated with a circumferential speed a few times greater than that of the supply roller 3.
  • the stretched thread is passed over a freely rotatable metal roller 16.
  • an electrical heating element 11 for heating the roller by radiation.
  • From the roller the thread is passed to the top guiding eyelet which is formed as a roller with a circumferential groove 12.
  • This roller 12 is freely rotatably supported by a supporting arm 13 mounted on a traversing beam 14.
  • the traversing beam 14 is moved up and down in a known manner by a mechanism (not shown) and supports a ring 15 along which ring traveller 16 is movable.
  • the ring is known per se and therefore not shown.
  • a winding bobbin 18 is placed on the spindle.
  • Example in a practical embodiment of the method according to the invention an unstretched thread with 35 filaments, a titre of 35.6 tex. (approximately 320 denier), and consisting of polycaprolactam was first drawn between the rollers 3 and 8 of the abovedescribed apparatus to such an extent that the thread was lengthened 3.12 times.
  • the thus stretched thread discharged from the stretching roller 8 at a speed of 360 m./rnin. and was thereupon heated on the roller 16 at a temperature of 113 C.
  • the thread 2 was passed through an air zone of 100 cm. up to the roller 32-, after which the thread was wound on the bobbin 18 while being twisted.
  • the top thread guide 12 was arranged at a height of cm. above the traversing beam 14 so that the thread path in the balloon amounted to about cm.
  • the weight of the traveller 16 was 38 mg, Whereas the ring 15 had a diameter of 8.7 cm. and the twisting spindle was rotated at 7900 revolutions per minute.
  • the yarn was wound on the bobbin with a balloon tension of 0.4 g./tex.
  • the shrinkage of the thread in the relaxation zone that is, the zone between the stretching roller 8 and the bobbin 18, was about 2.3%
  • Yarns resulting from the aforesaid process had an elongation of 37% at a tenacity of 46 g./teX., were immediately rewound from the stretch-twisting pirns onto the crosswound bobbins, and were stored in this form until they could be woven. This was done after 12 weeks. The fabric obtained did not appear to show any barr effect.
  • the yarns are first stored on the drawtwisting pirns for more than one week, or in some instances for more than 48 hours, and then woven, the fabric obtained does show a barre effect although to a lesser degree than a fabric that had been produced from yarns which had not been relaxed after stretching.
  • polyarnides which may be prepared from lactams, especially caprolactnrn or from diamines and dicarboxylic acids, especially those from adipic acid and heXamethylene diamine, but also polyesters, such as polymerized polymethylene terephthal-ates, especially polyethylene terephthalate.
  • a method for treating yarn formed from synthetic linear polycondensation products to eliminate pirn barr when woven into fabric comprising the steps of successively drawing said yarn, internally relaxing said yarn while maintaining substantially constant the length thereof, twisting said yarn while collecting the same on a pirn, and rewinding the drawn and twisted yarn onto a crosswound package within 4-8 hours from the time of original collection.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
US36330A 1959-06-25 1960-06-15 Method of treating synthetic yarns Expired - Lifetime US3081593A (en)

Applications Claiming Priority (1)

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NL240585 1959-06-25

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US3081593A true US3081593A (en) 1963-03-19

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US (1) US3081593A (xx)
BE (1) BE592066A (xx)
ES (1) ES259181A1 (xx)
GB (1) GB922294A (xx)
NL (2) NL240585A (xx)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3475896A (en) * 1968-04-29 1969-11-04 Celanese Corp Stabilizing yarn threadline during twisting
US3589120A (en) * 1968-11-29 1971-06-29 Ici Ltd Process for winding polyamide yarn packages with tapered end-portions
US3973387A (en) * 1974-04-15 1976-08-10 Monsanto Company Low delivery tension process for producing crimped yarn
CN103361812A (zh) * 2012-03-28 2013-10-23 日本Tmt机械株式会社 混合长丝制造装置
US20230079829A1 (en) * 2020-02-20 2023-03-16 Sanko Tekstil Isletmeleri Sanayi Ve Ticaret Anonim Sirketi Winding and twisting device for a ring spinning or ring twisting machine

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110760968A (zh) * 2019-12-03 2020-02-07 雄县勤丰纺织制造有限公司 一种合股线牵伸还原装置以及使用其的纱线绕卷成型机

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE548428A (xx) *
US2491569A (en) * 1948-06-17 1949-12-20 Du Pont String-up device
US2800762A (en) * 1954-12-14 1957-07-30 Joh Jacob Rieter & Co Ltd Apparatus for making yarn packages
GB798909A (en) * 1955-07-19 1958-07-30 Onderzoekings Inst Res Improved process for manufacturing effect yarns from linear polycondensation products
GB800555A (en) * 1955-10-19 1958-08-27 British Nylon Spinners Ltd Improvements in or relating to ring-spinning apparatus
US2956330A (en) * 1957-05-23 1960-10-18 Du Pont Stabilized yarn

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE548428A (xx) *
US2491569A (en) * 1948-06-17 1949-12-20 Du Pont String-up device
US2800762A (en) * 1954-12-14 1957-07-30 Joh Jacob Rieter & Co Ltd Apparatus for making yarn packages
GB798909A (en) * 1955-07-19 1958-07-30 Onderzoekings Inst Res Improved process for manufacturing effect yarns from linear polycondensation products
GB800555A (en) * 1955-10-19 1958-08-27 British Nylon Spinners Ltd Improvements in or relating to ring-spinning apparatus
US2956330A (en) * 1957-05-23 1960-10-18 Du Pont Stabilized yarn

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3475896A (en) * 1968-04-29 1969-11-04 Celanese Corp Stabilizing yarn threadline during twisting
US3589120A (en) * 1968-11-29 1971-06-29 Ici Ltd Process for winding polyamide yarn packages with tapered end-portions
US3973387A (en) * 1974-04-15 1976-08-10 Monsanto Company Low delivery tension process for producing crimped yarn
CN103361812A (zh) * 2012-03-28 2013-10-23 日本Tmt机械株式会社 混合长丝制造装置
CN103361812B (zh) * 2012-03-28 2016-08-03 日本Tmt机械株式会社 混合长丝制造装置
US20230079829A1 (en) * 2020-02-20 2023-03-16 Sanko Tekstil Isletmeleri Sanayi Ve Ticaret Anonim Sirketi Winding and twisting device for a ring spinning or ring twisting machine

Also Published As

Publication number Publication date
GB922294A (en) 1963-03-27
NL107778C (xx)
ES259181A1 (es) 1960-09-16
BE592066A (nl) 1960-10-17
NL240585A (xx)

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