[go: up one dir, main page]

WO1992000410A1 - Dispositif de fausse torsion a grande vitesse - Google Patents

Dispositif de fausse torsion a grande vitesse Download PDF

Info

Publication number
WO1992000410A1
WO1992000410A1 PCT/EP1991/001215 EP9101215W WO9200410A1 WO 1992000410 A1 WO1992000410 A1 WO 1992000410A1 EP 9101215 W EP9101215 W EP 9101215W WO 9200410 A1 WO9200410 A1 WO 9200410A1
Authority
WO
WIPO (PCT)
Prior art keywords
strand
yarn
friction
twist
false twisting
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.)
Ceased
Application number
PCT/EP1991/001215
Other languages
English (en)
Inventor
Kurt W. Niederer
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of WO1992000410A1 publication Critical patent/WO1992000410A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

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
    • D02G1/02—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
    • D02G1/04—Devices for imparting false twist
    • D02G1/08—Rollers or other friction causing elements

Definitions

  • This invention relates to a system for applying a false twist to a continuously traveling yarn-strand, and more particularly to a system for passing the yarn-strand in frictional contact over moving surfaces.
  • the contact length of the yarn-strand with the twisting elements on todays texturing-machines is usually relatively short and the yarn-strand is in most cases pulled lengthwise over the surface of the twist imparting elements. For these reasons, the yarn-strand is slipping substantially on these twist imparting surfaces. This slippage, together with the high contact pressure from the twist-imparting elements, results in frictional damage of the yarn-strand, which can be seen as rubbed off particles known as "snow". The process speed on todays false-twist texturing machines is restricted by this high contact pressure and the "snow" generating slippage.
  • the yarn-strand is then wrapped in like fashion around the second friction roll and so forth.
  • the yarn-strand can be wrapped several times around the 4 (four) friction-rolls to maximize the twist applying contact surface of the friction imparting friction rolls. It is understood that a system of fewer or more than 4 (four) rolls can be applied.
  • the 4 (four) friction rolls are of conical shape, where the incoming yarn-strand contacts the larger diameter of the friction rolls.
  • the purpose of the conical shape of the friction rolls is to reduces the tension of the yarn-strand during the twisting action.
  • the 4 (four) friction rolls are of convex and/or of concave shape to affect the tension during the twisting action in a desired fashion.
  • a second set of 4 (four) friction rolls are located underneath the first set in order to double the number of contacts of the yarn-strand with the friction applying rolls.
  • 2 (two) or more parallel friction rolls are rotating in the same direction, around which the yarn-strand is wrapped in spiral fashion.
  • 2 (two) or more friction rolls are rotating in the same direction and point with their axes towards a point, located towards the exit of the yarn-strand, to facilitate the sliding off of the yarn-strand.
  • the yarn-strand is wrapped alternately around a rotating ring and around rotating friction pins in order to insert false twist into the yarn-strand.
  • the polygonal arrangement of the friction rolls are replaced by a moving endless belt around which the yarn-strand is wrapped.
  • a friction disk is located between 2 (two) parallel friction rolls, around which the yarn-strand is wrapped.
  • FIG. 1 is a perspective view of the false-twisting system with 4 (four) friction rolls, according to the present invention.
  • FIG. 2 is a top view of the false-twisting system with 4 (four) friction rolls, according to the present invention as shown in FIG. 1.
  • FIG. 3 is a top view of the false-twisting system with 4 (four) friction rolls with added guiding pins, according to the present invention.
  • FIG. 4a is a perspective view of the yarn entrance of the false-twisting system with a diagram of the velocity- vectors at the yarn-entrance. It shows the velocity of the surface of the yarn-strand and of the surface of the friction roll, according to the present invention.
  • FIG. 4b is a perspective view of the yarn exit of the false-twisting system with the velocity-vectors at the yarn-exit. It shows the velocity of the yarn-strand of the surface of the friction roll, according to the present invention.
  • FIG. 5 is a perspective view of the false-twistincr system with 4 (four) friction rolls of conical design, according to the present invention.
  • FIG. 6 is a perspective view of the false-twisting system with a second set of 4 (four) friction rolls located underneath the first set, according to the present invention.
  • FIG. 7a shows in top view a false-twisting system with a driven rotating friction ring and 4 (four) friction rolls, according to the present invention.
  • FIG. 7b shows in a side view the false-twisting system, according to FIG. 7a.
  • FIG. 8a is a perspective view of a false-twisting system with a pair of rotating friction rolls, according to the present invention.
  • FIG. 8b is a perspective view of a false-twisting system with two driven friction rolls, arranged in angular position to each other, according to the present invention.
  • FIG. 9 shows in top view a false-twisting system with a driven friction belt, according to the present invention.
  • FIG. 10a shows in bottom view a false-twisting system with two driven friction rolls and a driven friction disk in between, according to the present invention.
  • FIG. 10b shows the false-twisting system as shown in FIG. 10a from the front.
  • FIG. 10c shows in perspective view from underneath the false-twisting system as shown in FIG. 10a.
  • FIG. lOd shows a variation of the unit as shown in FIG. 10a, FIG. 10b and FIG. 10c. It is provided with 2 (two) friction disks (14) .
  • One friction disk (14) can be ⁇ adjusted along the axes of the friction rolls (2) . Spreading the 2 (two) friction disks (14) further apart, increases the twist level in the yarn (1) and visa versa.
  • FIG. lla shows the yarn-path around a friction roll in front-view.
  • FIG. lib shows the yarn-path in a side-view.
  • FIG. 1 and FIG. 2 illustrate how the yarn (1) is wrapped around the friction rolls (2) , starting with the entering yarn (4) and leaving the twisting unit with the exiting yarn (5) .
  • the yarn (1) is wrapped 3 (three) times around the 4 (four) friction roll (2) .
  • separation pins (3)as shown in FIG. 3 especially for the start-up.
  • These separation pins (3) when properly placed, will not touch the yarn (1) after the start-up.
  • the yarn (1) is in twisted state before it enters the false-twisting unit.
  • the yarn (1) has no twist. This means that the entering yarn (4) is rotating around it's own axis. However, the exiting yarn (5) is not rotating around it's own axis.
  • FIG. 4a and FIG. 4b indicate the velocity of the yarn (1) and the friction roll (2) . If no slippage exists between the yarn (1) and the surface of the friction rolls (2) , the surface velocity (6) of the roll is equal the resultant of the components of the axial yarn velocity (10) and the tangential yarn velocity (11) .
  • the axial yarn velocity (10) of the exiting yarn (5) is equal the surface velocity of the roll (6) and the tangential yarn velocity (11) is zero, since the exiting yarn (5) does not twist around it's axis.
  • FIG. 5 A better suited configuration for the slippage-free twisting of yarn (1) is shown in FIG. 5 with the tapered rolls (13) .
  • the taper of the tapered roll (13) allows to compensate for the lower axial yarn velocity (10) of the entering yarn (4) , as compared to the axial yarn velocity (10) of the exiting yarn (5) .
  • the taper of the tapered roll (13) is also affected by the shrinkage of the yarn (1) due to the cooling, as well as due to the twisting and can be properly selected for a desired tension characteristic during the twisting of the yarn (1) . For example, a smaller diameter of the tapered roll (13) at a specific location results in higher tension down-stream.
  • FIG. 6 shows how the number of contacts of the yarn- strand can be doubled with a second set of secondary friction roll (12) underneath the standard friction roll (2).
  • a friction ring (7) and 4 (four) friction studs (8) replace the friction rolls (2) . 4 (four) drive pins (9) rotate counter-clockwise and drive the friction ring (7) . 4 (four) friction studs (8) rotate also counter-clockwise.
  • the yarn (1) is alternately wrapped around the friction ring (7) and the friction studs (8).
  • FIG. 8a and FIG. 8b Another alternative method is shown in FIG. 8a and FIG. 8b, where two opposite friction rolls (2) are omitted.
  • FIG. 8a the 2 (two) friction rolls (2) are parallel and in FIG. 8b, the 2 (two) friction rolls (2) are slightly angled towards each other for better feeding of the yarn
  • FIG. 9 Still another alternative method is shown in FIG. 9 where the friction disk (14) of FIG. 7a and FIG. 7b is replaced by an endless belt (21) , driven by drive rolls
  • the yarn (1) can be wrapped several times around the belt if so desired.
  • FIG. 10a, FIG. 10b, FIG. 10c and FIG. lOd two opposite friction rolls (2) as shown in FIG. 1 are replaced by one or more friction disks (14) .
  • the yarn (1) passes first around the friction disk (14) and is then wrapped around the first friction roll (2) ; from there it passes around the front side of the friction disk (14) and around the second friction roll (2) .
  • the yarn (1) leaves the twisting unit after a last wrapping around the back-side of the friction disk (14) .
  • the twist level can be increased by the application of a larger friction disk (14) and visa versa.
  • two friction disks (14) are used, of which at least one can be adjusted in the direction of the axis of friction roll (2) as shown in FIG. lOd
  • FIG. 11a and FIG. lib show the yarn path (18) around a friction roll (2) .
  • the yarn (1) makes contact with the friction roll (2) at the entrance contact point (15) and leaves the surface of the friction roll (2) at the exit contact point (16) .
  • the radial force (19) presses the yarn (1) in contact with the surface of the friction roll (2) and imparts added twist to the yarn (l) through the frictional force.
  • the added twist imparted by this portion of the false-twisting unit, makes the yarn-spiral steeper and can be seen as the angle of added twist (17) .

Landscapes

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

Abstract

Un dispositif d'application d'une fausse torsion à une trame de fil en mouvement continu, utilisant une pluralité d'éléments mobiles, produisant une torsion, disposés de façon que la trame ait un mouvement roulant plutôt que coulissant sur chacune de ses surfaces produisant une torsion. Le dispositif de fausse torsion n'utilise pas de guides fixes, limitant la torsion entre les différents éléments de torsion mais utilise à leur place, d'autres éléments de torsion de fil, orientés de façon appropriée par rapport aux éléments de torsion qui les précédent et qui les suivent. Des lignes de contact extrêmement longues entre la trame et les éléments de torsion servent à diminuer la pression spécifique exercée sur le fil pour assurer une tension faible et légère ainsi qu'un déroulement à grande vitesse du processus de fausse torsion.
PCT/EP1991/001215 1990-07-02 1991-06-28 Dispositif de fausse torsion a grande vitesse Ceased WO1992000410A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DEG9010057.3U 1990-07-02
DE9010057U DE9010057U1 (de) 1990-07-02 1990-07-02 Hochgeschwindigkeits - Falschdraht - Zwirn - Vorrichtung

Publications (1)

Publication Number Publication Date
WO1992000410A1 true WO1992000410A1 (fr) 1992-01-09

Family

ID=6855212

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP1991/001215 Ceased WO1992000410A1 (fr) 1990-07-02 1991-06-28 Dispositif de fausse torsion a grande vitesse

Country Status (3)

Country Link
EP (1) EP0500842A1 (fr)
DE (1) DE9010057U1 (fr)
WO (1) WO1992000410A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108374214A (zh) * 2018-04-26 2018-08-07 张维国 假捻器及其使用方法

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1898540U (de) * 1964-05-27 1964-08-13 Hoechst Ag Vorrichtung zum kraeuseln von faeden.
US3555807A (en) * 1967-06-08 1971-01-19 Scragg & Sons Method of treating yarn
DE2460031A1 (de) * 1973-12-31 1975-07-10 Rudolf Gehring Vorrichtung zur falschdrallerzeugung bei thermoplastischen garnen
FR2316360A1 (fr) * 1975-06-18 1977-01-28 Bayer Ag Appareil de torsion a friction interne

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1898540U (de) * 1964-05-27 1964-08-13 Hoechst Ag Vorrichtung zum kraeuseln von faeden.
US3555807A (en) * 1967-06-08 1971-01-19 Scragg & Sons Method of treating yarn
DE2460031A1 (de) * 1973-12-31 1975-07-10 Rudolf Gehring Vorrichtung zur falschdrallerzeugung bei thermoplastischen garnen
FR2316360A1 (fr) * 1975-06-18 1977-01-28 Bayer Ag Appareil de torsion a friction interne

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108374214A (zh) * 2018-04-26 2018-08-07 张维国 假捻器及其使用方法
CN108374214B (zh) * 2018-04-26 2023-11-03 张维国 假捻器及其使用方法

Also Published As

Publication number Publication date
EP0500842A1 (fr) 1992-09-02
DE9010057U1 (de) 1990-10-11

Similar Documents

Publication Publication Date Title
US3045416A (en) False twisting device
US4047373A (en) False-twisting method and apparatus for producing crimped filament yarns
US2991614A (en) False twisting apparatus for producing crimped filamentary materials
US3641755A (en) Machine and process for making wire cables
US3091908A (en) Apparatus and method for false twisting yarns
US4276740A (en) Self-twisted yarn and method and apparatus for producing it
US2987869A (en) Yarn crimping apparatus and methods
JPS5949336B2 (ja) 摩擦仮撚方法およびその装置
US3445996A (en) Preheating in yarn texturing
WO1992000410A1 (fr) Dispositif de fausse torsion a grande vitesse
US2988867A (en) Method of handling a plurality of yarns during processing
US3724191A (en) Treatment of synthetic yarns
US3422613A (en) Yarn assembly apparatus for false twisting yarn
US4081948A (en) Manufacture of bulked yarn
US3345811A (en) Apparatus for false twisting yarn
US2673442A (en) False twisting of textile fibers
US6212867B1 (en) False twist device
JP2580316B2 (ja) 糸の仮撚方法及びその仮撚装置
US3431716A (en) Process for producing a crimped multifilament yarn
US3782088A (en) False twister
JPH0247322A (ja) 糸の仮燃装置
JPS6215342A (ja) 特殊糸の仮撚方法
US4162607A (en) Entangled yarns
US3812664A (en) Continuous crimping of yarns
GB2119820A (en) Process and apparatus for making yarn from roving

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A1

Designated state(s): JP US

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): AT BE CH DE DK ES FR GB GR IT LU NL SE

WWP Wipo information: published in national office

Ref document number: 1991914848

Country of ref document: EP

WWE Wipo information: entry into national phase

Ref document number: 1991914848

Country of ref document: EP

WWW Wipo information: withdrawn in national office

Ref document number: 1991914848

Country of ref document: EP