EP0036948B1 - Process and device for making elastic yarn - Google Patents

Process and device for making elastic yarn Download PDF

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Publication number
EP0036948B1
EP0036948B1 EP81101383A EP81101383A EP0036948B1 EP 0036948 B1 EP0036948 B1 EP 0036948B1 EP 81101383 A EP81101383 A EP 81101383A EP 81101383 A EP81101383 A EP 81101383A EP 0036948 B1 EP0036948 B1 EP 0036948B1
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EP
European Patent Office
Prior art keywords
yarns
elastomeric thread
thread
delivery
clutch
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
EP81101383A
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German (de)
French (fr)
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EP0036948A1 (en
Inventor
Gunter D'alquen
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.)
Krall and Roth Weberei GmbH and Co KG
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Krall and Roth Weberei GmbH and Co KG
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Application filed by Krall and Roth Weberei GmbH and Co KG filed Critical Krall and Roth Weberei GmbH and Co KG
Priority to AT81101383T priority Critical patent/ATE8671T1/en
Publication of EP0036948A1 publication Critical patent/EP0036948A1/en
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Publication of EP0036948B1 publication Critical patent/EP0036948B1/en
Expired legal-status Critical Current

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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
    • D02G3/00—Yarns or threads, e.g. fancy yarns; Processes or apparatus for the production thereof, not otherwise provided for
    • D02G3/22—Yarns or threads characterised by constructional features, e.g. blending, filament/fibre
    • D02G3/32—Elastic yarns or threads ; Production of plied or cored yarns, one of which is elastic
    • D02G3/324—Elastic yarns or threads ; Production of plied or cored yarns, one of which is elastic using a drawing frame

Definitions

  • the invention relates to a method for producing an elastic thread, in which an elastomer thread of approximately 154 dtex to 220 dtex is twisted in an adhesive manner with two yarns, each of which has a thickness of about 1/10 of the elastomer thread, OE yarns produced as yarns using the rotor method from polyvinyl chloride, polyvinyl cyanide, polyacrylonitrile and / or finished wool threads are used and the yarns before twisting to loosen them and to achieve adhesion at a pressure between about 0.1 and 0.2 bar in superheated steam of about 70 ° C. up to Swollen on their surface for 10 minutes. and where the elastomeric thread is given a twist to about 5-fold warping compared to the yarns, and a device for carrying out this method.
  • the invention has for its object to avoid this tearing of threads during the start-up phase of the twisting device, the advantages of the method according to DE-A-2811 329 should be maintained and increased productivity with less downtime should be made possible.
  • this object is achieved in a method of the type mentioned at the outset in that the tension of the elastomer thread is kept approximately equal to the tension of the yarns when the twisting device is started, and the elastomeric thread is given the warp over the yarns only after a predetermined period of time after starting the twisting device .
  • a device proposed according to the invention for carrying out this method is characterized in that two gears with different ratios for transmitting the torque of a drive shaft to a yarn delivery cylinder and an egg-thread delivery cylinder of a twisting device are provided, the first gear with a ratio that has approximately the same delivery speed for the yarns and the elastomer thread, results from a first coupling to the drive shaft when the twisting device is switched on and can be uncoupled after a predetermined period of time and the second gear, which causes an approximately 2 to 5 times lower delivery speed of the elastomer thread compared to the yarns , can be simultaneously engaged by a second clutch.
  • a particularly preferred embodiment of the invention provides that the period of time until use of the second gear, which gives the elastomer thread about 2 to 5 times less delivery speed than the yarns, is about 4 seconds.
  • the clutch is an electric clutch, with a clutch of the first clutch simultaneously disengaging the second clutch.
  • the delay is only built up after the device has started up, it can be achieved that the elastomer thread is not overstretched in the start-up phase or the yarn threads are suddenly loaded so high when starting that they tear.
  • an elastic thread 11 is produced from an elastomer thread 10 and two OE yarns.
  • the three threads are twisted in a twisting ring 21, aligned essentially parallel, via a deflection roller 24 for the elastomer thread or guide rollers 26, 27, 28.
  • the non-elastic yarns 13 and 14 are withdrawn from their spools 16, 17 by the interaction of a pressure cylinder 19 which rests on the delivery cylinder 18, if necessary.
  • the conveying speed of the yarns is determined by the speed of rotation of the delivery cylinder 18.
  • the elastomer thread 10 is withdrawn from its supply roll 22 with the aid of a delivery cylinder 23, the distortion of the elastomer thread depending on the speed of rotation of the delivery cylinder 23.
  • the delivery cylinder 23 and the delivery cylinder 18 are driven by a common drive shaft 38, the respective rotational speeds via transmission gears 34, 36 are regulated.
  • the first translation which takes place through the gear 34, which is just engaged in the operating shaft shown and is therefore effective, leads to a delivery speed of elastomer thread and yarns of approximately 1: 1.
  • the elastomer thread therefore has no warpage with respect to the yarns.
  • the other gear 36 shown in the drawing as non-engaged, leads to an approximately 2 to 5-fold warping of the elastomer thread in that the delivery cylinder 23 rotates correspondingly more slowly than the delivery cylinder 18.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)

Abstract

A process and apparatus for producing a twisted elastic thread in which an elastomeric thread of substantially 154 dtex to 310 dtex, is adhesively twisted with two yarns. The thickness of each of the two yarns is substantially of 100 to 12,500 dtex, and the yarns preferably are OE yarns of polyvinyl chloride, polyvinyl cyanide, polyacrylonitrile and/or wool threads, preferably produced by the rotor process. Prior to twisting, the yarns are surface-swelled under a vacuum between substantialy 0.1 and 0.2 bar in superheated steam at substantially 70 DEG C. for up to ten minutes for loosening purposes. During twisting, a pre-tension is imparted to the elastomeric thread with respect to the yarns. Such pre-tension is imparted to the elastomeric thread only a predetermined time after starting the twister, and the elastomeric thread is pre-tensioned by substantially 2 to substantially 5 times compared with the yarns.

Description

Die Erfindung betrifft ein Verfahren zum Herstellen eines elastischen Zwirnes, bei dem ein Elastomerfaden von etwa 154 dtex bis 220 dtex mit zwei Garnen, denen Stärke jeweils etwa 1/10 des Elastomerfadens beträgt, haftend verzwirnt wird, wobei als Garne im Rotorverfahren hergestellte OE-Garne aus Polyvinylchlorid-, Polyvinylcyanid, Polyacrylnitril- und/oder ausgerüstete Wollfäden verwendet werden und die Garne vor dem Verzwirnen zum Auflockern und zum Erzielen der Haftung bei einem Druck zwischen etwa 0,1 und 0,2 bar in Heißdampf von etwa 70 °C bis zu 10 Minuten an ihrer Oberfläche angequolle. werden und wobei dem Elastomerfaden bei der Verzwirnung gegenüber den Garnen ein zwischen 2- bis etwa 5-facher Verzug gegeben wird, sowie eine Vorrichtung zur Durchführung dieses Verfahrens.The invention relates to a method for producing an elastic thread, in which an elastomer thread of approximately 154 dtex to 220 dtex is twisted in an adhesive manner with two yarns, each of which has a thickness of about 1/10 of the elastomer thread, OE yarns produced as yarns using the rotor method from polyvinyl chloride, polyvinyl cyanide, polyacrylonitrile and / or finished wool threads are used and the yarns before twisting to loosen them and to achieve adhesion at a pressure between about 0.1 and 0.2 bar in superheated steam of about 70 ° C. up to Swollen on their surface for 10 minutes. and where the elastomeric thread is given a twist to about 5-fold warping compared to the yarns, and a device for carrying out this method.

Aus der DE-A-2 811 329 sind ein Verfahren sowie eine Vorrichtung der vorstehend beschriebenen Art bekannt, welche die Herstellung eines für bi-elastische Gewebe geeigneten elastischen Zwirnes unter Verwendung von OE-Garnen ermöglichen und bei denen keine nachteiligen Veränderungen der Qualität der verwendeten Fäden und Garne durch Klebstoff- und/oder Temperatureinflüsse auftreten, wie dies ansonsten häufig der Fall ist. Es hat sich herausgestellt, daß bei der Herstellung von Zwirnen nach dem vorstehend beschriebenen Verfahren jedoch beim Anlaufen und Anhalten der Zwirnvorrichtung Fadenrisse auftreten können, insbesondere dann, wenn eine Maschine kurzzeitig abgestellt werden muß, ohne daß beispielsweise Garnrollen oder dergleichen ausgetauscht werden.From DE-A-2 811 329 a method and a device of the type described above are known which enable the production of an elastic thread suitable for bi-elastic fabrics using OE yarns and in which no adverse changes in the quality of those used Threads and yarns occur as a result of adhesive and / or temperature influences, as is otherwise often the case. It has been found that during the production of twists using the method described above, thread breaks can occur when the twisting device starts up and stops, especially when a machine has to be shut down briefly without, for example, thread spools or the like being exchanged.

Der Erfindung liegt die Aufgabe zugrunde, dieses Abreißen von Fäden während der Anlaufphase der Zwirnvorrichtung zu vermeiden, wobei die Vorteile des Verfahrens nach der DE-A-2811 329 beibehalten und eine erhöhte Produktivität mit geringeren Ausfallzeiten ermöglicht werden sollen.The invention has for its object to avoid this tearing of threads during the start-up phase of the twisting device, the advantages of the method according to DE-A-2811 329 should be maintained and increased productivity with less downtime should be made possible.

Erfindungsgemäß wird diese Aufgabe bei einem Verfahren der eingangs genannten Art dadurch gelöst, daß die Spannung des Elastomerfadens bei Ingangsetzen der Zwirnvorrichtung in etwa gleich der Spannung der Garne gehalten und erst nach einem vorherbestimmten Zeitraum nach Ingangsetzen der Zwirnvorrichtung dem Elastomerfaden gegenüber den Garnen der Verzug gegeben wird.According to the invention, this object is achieved in a method of the type mentioned at the outset in that the tension of the elastomer thread is kept approximately equal to the tension of the yarns when the twisting device is started, and the elastomeric thread is given the warp over the yarns only after a predetermined period of time after starting the twisting device .

Eine erfindungsgemäß vorgeschlagene Vorrichtung zur Durchführung dieses Verfahrens ist dadurch gekennzeichnet, daß zwei Getriebe mit unterschiedlichen Übersetzungen zur Übertragung des Drehmoments einer Antriebswelle auf einen Garnlieferzylinder und einen Eiastomerfaden-Lieferzylinder einer Zwirnvorrichtung vorgesehen sind, wobei das erste Getriebe mit einer Übersetzung, die in etwa gleiche Liefergeschwindigkeit für die Garne und den Elastomerfaden ergibt, von einer ersten Kupplung an die Antriebswelle bei Einschalten der Zwirnvorrichtung zunächst an- und nach einem vorherbestimmten Zeitraum abkuppelbar und das zweite Getriebe, das eine etwa 2- bis 5-fach kleinere Liefergeschwindigkeit des Elastomerfadens gegenüber den Garnen bewirkt, gleichzeitig durch eine zweite Kupplung einkuppelbar ist.A device proposed according to the invention for carrying out this method is characterized in that two gears with different ratios for transmitting the torque of a drive shaft to a yarn delivery cylinder and an egg-thread delivery cylinder of a twisting device are provided, the first gear with a ratio that has approximately the same delivery speed for the yarns and the elastomer thread, results from a first coupling to the drive shaft when the twisting device is switched on and can be uncoupled after a predetermined period of time and the second gear, which causes an approximately 2 to 5 times lower delivery speed of the elastomer thread compared to the yarns , can be simultaneously engaged by a second clutch.

Eine besonders bevorzugte Ausführungsform der Erfindung sieht vor, daß der Zeitraum bis zum Einsatz des zweiten Getriebes, welches dem Elastomerfaden die etwa 2- bis 5-fach kleinere Liefergeschwindigkeit gegenüber den Garnen verleiht, etwa 4 Sekunden beträgt.A particularly preferred embodiment of the invention provides that the period of time until use of the second gear, which gives the elastomer thread about 2 to 5 times less delivery speed than the yarns, is about 4 seconds.

Auch kann erfindungsgemäß vorgesehen sein, daß die Kupplung Elektrokupplungen sind, wobei ein Einkuppeln der ersten Kupplung gleichzeitig das Auskuppeln der zweiten Kupplung bewirkt.It can also be provided according to the invention that the clutch is an electric clutch, with a clutch of the first clutch simultaneously disengaging the second clutch.

Dadurch, daß der Verzug erst nach Anlaufen der Vorrichtung aufgebaut wird, kann erreicht werden, daß der Elastomerfaden nicht in der Anlaufphase überdehnt wird oder die Garnfäden plötzlich so hoch beim Anfahren belastet werden, daß sie reißen.Because the delay is only built up after the device has started up, it can be achieved that the elastomer thread is not overstretched in the start-up phase or the yarn threads are suddenly loaded so high when starting that they tear.

Aus der CH-PS 465 461 ist zwar bereits eine Vorrichtung zum Herstellen eines elastischen Zwirnes bekannt, bei welcher die Relativgeschwindigkeit der Einzelfäden einstellbar ist, jedoch bleibt der erzielbare Verzug dort während des Betriebes konstant, so daß also nicht in der erfindungsgemäßen Weise beim Ingangsetzen der Zwirnvorrichtung die Spannung des Elastomerfadens gleich derjenigen der Spannung der anderen Garne gehalten werden kann.From CH-PS 465 461 a device for producing an elastic thread is already known, in which the relative speed of the individual threads is adjustable, but the achievable delay there remains constant during operation, so that it is not in the manner according to the invention when starting the Twisting device the tension of the elastomer thread can be kept equal to that of the tension of the other yarns.

Nachstehend wird ein Ausführungsbeispiel der Erfindung anhand der aus einer einzigen Figur bestehenden Zeichnung, welche eine schematische Darstellung einer Vorrichtung zur Durchführung des erfindungsgemäßen Verfahrens zeigt, erläutert.An exemplary embodiment of the invention is explained below on the basis of the drawing consisting of a single figure, which shows a schematic representation of a device for carrying out the method according to the invention.

Bei dem erfindungsgemäßen Verfahren wird ein elastischer Zwirn 11 aus einem Elastomerfaden 10 und zwei OE-Garnen hergestellt. Wie in der DE-A-2811 329 beschrieben und in der einzigen Figur dargestellt ist, werden die drei Fäden über eine Umlenkrolle 24 für den Elastomerfaden bzw. Führungsrollen 26, 27, 28 im wesentlichen parallel ausgerichtet in einem Zwirnring 21 verzwirnt. Dabei werden die nicht-elastischen Garne 13 und 14 von ihren Garnrollen 16, 17 durch das Zusammenwirken eines Druckzylinders 19, der bedarfsweise auf dem Lieferzylinder 18 aufliegt, abgezogen. Die Fördergeschwindigkeit der Garne wird dabei durch die Drehgeschwindigkeit des Lieferzylinders 18 bestimmt. Der Elastomerfaden 10 wird von seiner Vorratsrolle 22 mit Hilfe eines Lieferzylinders 23 abgezogen, wobei der Verzug des Elastomerfadens von der Drehgeschwindigkeit des Lieferzylinders 23 abhängt. Der Lieferzylinder 23 sowie der Lieferzylinder 18 werden durch eine gemeinsame Antriebswelle 38 angetrieben, wobei die jeweiligen Umdrehungsgeschwindigkeiten über Übersetzungsgetriebe 34, 36 geregelt werden.In the method according to the invention, an elastic thread 11 is produced from an elastomer thread 10 and two OE yarns. As described in DE-A-2811 329 and shown in the single figure, the three threads are twisted in a twisting ring 21, aligned essentially parallel, via a deflection roller 24 for the elastomer thread or guide rollers 26, 27, 28. The non-elastic yarns 13 and 14 are withdrawn from their spools 16, 17 by the interaction of a pressure cylinder 19 which rests on the delivery cylinder 18, if necessary. The conveying speed of the yarns is determined by the speed of rotation of the delivery cylinder 18. The elastomer thread 10 is withdrawn from its supply roll 22 with the aid of a delivery cylinder 23, the distortion of the elastomer thread depending on the speed of rotation of the delivery cylinder 23. The delivery cylinder 23 and the delivery cylinder 18 are driven by a common drive shaft 38, the respective rotational speeds via transmission gears 34, 36 are regulated.

Dabei sind in der Figur zwei verschiedene Übersetzungen dargestellt. Die erste Übersetzung, die durch das Getriebe 34 erfolgt, welches bei der dargestellten Betriebswelle gerade eingekuppelt ist und daher wirksam ist, führt zu einer Liefergeschwindigkeit von Elastomerfaden und Garnen von etwa 1 : 1. Der Elastomerfaden weist also gegenüber den Garnen keinen Verzug auf. Das andere, in der Zeichnung als nicht-eingekuppelt dargestellte Getriebe 36 führt zu einem etwa 2- bis etwa 5-fachen Verzug des Elastomerfadens, indem der Lieferzylinder 23 sich gegenüber dem Lieferzylinder 18 entsprechend langsamer dreht.Two different translations are shown in the figure. The first translation, which takes place through the gear 34, which is just engaged in the operating shaft shown and is therefore effective, leads to a delivery speed of elastomer thread and yarns of approximately 1: 1. The elastomer thread therefore has no warpage with respect to the yarns. The other gear 36, shown in the drawing as non-engaged, leads to an approximately 2 to 5-fold warping of the elastomer thread in that the delivery cylinder 23 rotates correspondingly more slowly than the delivery cylinder 18.

Das Ingangsetzen der Vorrichtung, die zur Durchführung des erfindungsgemäßen Verfahrens verwendet wird, verläuft folgendermaßen :

  • Zunächst wird durch das Anschalten die erste Kupplung 30 beaufschlagt, welche einkuppelt - wie in der Figur gezeigt -, wodurch das Drehmoment der Antriebswelle 38 bei einer etwa 1 : 1- fachen Übersetzung zu etwa gleicher Liefergeschwindigkeit für elastisches Garn und OE-Garn führt. Nach einer vorbestimmten Zeit wird, beispielsweise durch einen elektrischen Zeitkreis oder ähnliche, dem Fachmann wohlbekannte Einrichtungen, die zweite Kupplung 32 beaufschlagt und gleichzeitig die Kupplung 30 getrennt, so daß das Drehmoment der Antriebswelle 38 nunmehr über das Getriebe 36 wirkt. Bei diesem Antrieb wird dem Elastomerfaden ein etwa 2- bis 5-facher, bevorzugt 3,5-facher Verzug gegenüber den unelastischen Garnfäden gegeben.
The device which is used to carry out the method according to the invention is started up as follows:
  • First of all, the first clutch 30 is acted upon by the switching on, which engages - as shown in the figure -, whereby the torque of the drive shaft 38 with an approximately 1: 1-fold ratio leads to approximately the same delivery speed for elastic yarn and OE yarn. After a predetermined time, the second clutch 32 is acted upon, for example by an electrical time circuit or similar devices well known to the person skilled in the art, and at the same time the clutch 30 is disconnected, so that the torque of the drive shaft 38 now acts via the transmission 36. With this drive, the elastomer thread is given about 2 to 5 times, preferably 3.5 times, warp compared to the inelastic thread.

Selbstverständlich liegt es im Bereich des Erfindungsgedankens, statt einer Elektrokupplung mechanische Kupplungen vorzusehen, welche auch beliebig manuell geschaltet sein können. Es ist jedoch bevorzugt, die Kupplungen derart zu kuppeln, daß lediglich eine Kupplung eingerastet sein kann und wirksam ist.Of course, it is within the scope of the inventive concept to provide mechanical clutches instead of an electric clutch, which can also be switched manually as desired. However, it is preferred to couple the clutches such that only one clutch can be engaged and is effective.

Claims (4)

1. A method of producing an elastic twist, in which an elastomeric thread of about 154 dtex to 220 dtex is adhesively twisted with two yarns, the thickness of each of which is about one-tenth of the elastomeric thread, the yarns used being OE yarns produced by the rotor method from polyvinyl chloride, polyvinyl cyanide, polyacrylonitrile and/or finished wool threads and before the twisting operation the yarns are subjected to swelling at their surface at a pressure of between about 0,1 and 0,2 bar in hot steam of a temperature of about 70 °C for a period of up to 10 minutes for the purposes of loosening and for achieving the adhesion, the speed of delivery of the elastomeric thread being between approximately one-half and one-fifth that of the yarns during the twisting operation, characterised in that the tension of the elastomeric thread on start-up of the twisting mechanism is kept substantially equal to the tension of the yarns and the speed of delivery of the elastomeric thread is not delayed with respect to the yarns until a predetermined time after the start-up of the twisting mechanism.
2. Apparatus for performing the method according to claim 1, characterised by the provision of two gears (34, 36) having different transmission ratios for transmitting the torque from a drive shaft (38) to a yarn delivery cylinder (18) and an elastomeric thread delivery cylinder (23) of a twisting mechanism, the first gear (34) having a transmission ratio giving a substantially identical delivery speed for the yarns (13, 14) and the elastomeric thread (10), and being initially adapted to be coupled to the drive shaft (38) when the twisting mechanism is switched on and decoupled therefrom after a predetermined time, by means of a first clutch (30), while the second gear (36) which provides a delivery speed for the elastomeric thread which is about one-half to one-fifth that of the yarns is simultaneously adapted to be engaged by a second clutch (32).
3. Apparatus according to claim 2, characterised in that the time until the second gear (36) is used, which gives the elastomeric thread (10) a delivery speed about one-half to one-fifth that of the yarns (13, 14), is about four seconds.
4. Apparatus according to claim 2 or 3, characterised in that the clutches (30, 32) are electrically actuated clutches, engagement of the first clutch (30) simultaneously causing disengagement of the second clutch (32).
EP81101383A 1980-04-02 1981-02-25 Process and device for making elastic yarn Expired EP0036948B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT81101383T ATE8671T1 (en) 1980-04-02 1981-02-25 METHOD AND DEVICE FOR MANUFACTURING AN ELASTIC TWINE.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3012753A DE3012753C2 (en) 1980-04-02 1980-04-02 Method and device for producing an elastic twist
DE3012753 1980-04-02

Publications (2)

Publication Number Publication Date
EP0036948A1 EP0036948A1 (en) 1981-10-07
EP0036948B1 true EP0036948B1 (en) 1984-07-25

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP81101383A Expired EP0036948B1 (en) 1980-04-02 1981-02-25 Process and device for making elastic yarn

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US (1) US4388801A (en)
EP (1) EP0036948B1 (en)
AT (1) ATE8671T1 (en)
DE (1) DE3012753C2 (en)

Families Citing this family (7)

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Publication number Priority date Publication date Assignee Title
DE3047956C2 (en) * 1980-12-19 1983-10-20 Krall & Roth Weberei GmbH & Co KG, 4050 Mönchengladbach Method and apparatus for making an elastic thread
DE202005020256U1 (en) 2005-05-10 2006-06-22 Sks Sitzkomponenten Gmbh & Co. Kg Formable multilayer plate material especially useful in manufacture of seats or other curved or recessed structures has a (preferably textile) layer laminated to a (preferably thermoplastic) carrier
DE202005020257U1 (en) * 2005-05-10 2006-06-22 Sks Sitzkomponenten Gmbh & Co. Kg Component used in the production of furniture, decorative elements and hollow chamber channels comprises a first molded part having a multiple layer structure consisting of a textile flat material assigned to a support layer
EP2039814B1 (en) 2007-09-21 2014-05-21 k&r Textil GmbH & Co. KG Textile flat material, in particular textile tissue with shrinking characteristics, application of same and products produced according to this method
DE202007019457U1 (en) 2007-09-21 2012-10-01 K&R Textil Gmbh & Co. Kg Textile sheet material, in particular textile fabric, having shrink properties
EP4268676A3 (en) 2019-02-21 2024-02-07 Steelcase Inc. Body support assembly and methods for the use and assembly thereof
US11357329B2 (en) 2019-12-13 2022-06-14 Steelcase Inc. Body support assembly and methods for the use and assembly thereof

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Publication number Priority date Publication date Assignee Title
US2069446A (en) * 1936-02-10 1937-02-02 Whitin Machine Works Drawing mechanism for spinning or twisting machines
US2146966A (en) * 1937-11-22 1939-02-14 American Mills Company Elastic strand for elastic fabrics and method of producing the same
US2310951A (en) * 1941-05-01 1943-02-16 Lloyd C Greene Process and apparatus for forming and treating yarn
DE1287189B (en) * 1959-06-29 1969-01-16 Monsanto Co Time programmer for a control element, in particular in a yarn delaying device for introducing knobs into yarns
US3099126A (en) * 1960-10-07 1963-07-30 Wall Rope Works Inc Yarn feeding apparatus
FR1338658A (en) * 1962-10-26 1963-09-27 Du Pont Process for manufacturing short fiber mixtures from continuous filaments
US3460338A (en) * 1964-03-13 1969-08-12 Burlington Industries Inc Stretch yarn
US3300956A (en) * 1964-07-24 1967-01-31 Deering Milliken Res Corp Core-spinning apparatus
GB1098012A (en) * 1965-01-14 1968-01-03 Chemstrand Ltd Improvements in or relating to elastic yarns and the manufacture thereof
US3489368A (en) * 1967-10-17 1970-01-13 Barber Colman Co Tension regulator for stretch core thread
DE2447715C3 (en) * 1974-10-07 1978-09-07 Hoechst Ag, 6000 Frankfurt Roving and process for its manufacture
DE2811329C2 (en) * 1978-03-16 1982-08-12 Krall & Roth Weberei GmbH & Co KG, 4050 Mönchengladbach Process for producing a bi-elastic twist
DE2849567C2 (en) * 1978-11-15 1982-07-22 Evolution S.A., Rorschach, St. Gallen Effect twisting machine
US4288977A (en) * 1980-04-10 1981-09-15 E. I. Du Pont De Nemours And Company Process for making integrated racket strings from monofilaments

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Publication number Publication date
DE3012753C2 (en) 1983-11-03
DE3012753A1 (en) 1981-10-08
EP0036948A1 (en) 1981-10-07
ATE8671T1 (en) 1984-08-15
US4388801A (en) 1983-06-21

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