EP0067701A1 - Procédé et dispositif de guipage - Google Patents

Procédé et dispositif de guipage Download PDF

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Publication number
EP0067701A1
EP0067701A1 EP82303076A EP82303076A EP0067701A1 EP 0067701 A1 EP0067701 A1 EP 0067701A1 EP 82303076 A EP82303076 A EP 82303076A EP 82303076 A EP82303076 A EP 82303076A EP 0067701 A1 EP0067701 A1 EP 0067701A1
Authority
EP
European Patent Office
Prior art keywords
spindle
false twist
yarn
rollers
core
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.)
Withdrawn
Application number
EP82303076A
Other languages
German (de)
English (en)
Inventor
Robert John Hunt
Norman Ash Hill
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.)
James Mackie and Sons Ltd
Original Assignee
James Mackie and Sons Ltd
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 James Mackie and Sons Ltd filed Critical James Mackie and Sons Ltd
Publication of EP0067701A1 publication Critical patent/EP0067701A1/fr
Withdrawn legal-status Critical Current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
    • 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
    • D02G3/38—Threads in which fibres, filaments, or yarns are wound with other yarns or filaments, e.g. wrap yarns, i.e. strands of filaments or staple fibres are wrapped by a helically wound binder yarn
    • D02G3/385—Threads in which fibres, filaments, or yarns are wound with other yarns or filaments, e.g. wrap yarns, i.e. strands of filaments or staple fibres are wrapped by a helically wound binder yarn using hollow spindles, e.g. making coverspun yarns

Definitions

  • This invention relates to wrap spinning, that is to say a spinning process in which a core of textile material is passed through a rotary spindle carrying a package of wrapper yarn which is withdrawn over-end from the package and is wound around the core as a result of the rotation of the spindle so as to bind the core together to form a coherent yarn.
  • the core material may take various forms, but is most commonly constituted by a sliver delivered directly from a drawing head so that the fibres proceed directly from the delivery rollers of the head to the rotary spindle.
  • the wrapper yarn may comprise, for example, mono- or multifilaments, tapes or natural or synthetic yarn.
  • Wrap yarn produced in this way can be used for a variety of purposes and its characteristics can be varied as required.
  • effect yarns can be produced by over-feeding an effect component in parallel with the core material through the rotary spindle.
  • the apparatus necessary for carrying out such a process comprises delivery rollers, a take-up roller or rollers, a hollow spindle which serves as a support for a package of wrapper yarn, being located between the delivery and take-up rollers, and mounted for rotation about its axis, and a drive for the spindle.
  • a device may be included for the specific purpose of applying the false twist.
  • a device preferably rotates at the same speed as the spindle so as to impart one-to-one false twist to the core material and by engagement with the core material curtails relative rotation between the device and the material at the point of engagement.
  • the false twist applied will be referred to as positive false twist and it is with this type of false twist that the present invention is concerned.
  • the false twist in the core material extends away from the false twist device in both directions along the core material until it reaches a point in either direction at which it is blocked. This blocking is most commonly caused by the delivery rollers for the.core material at the upper end and by the take-up rollers for the wrapped yarn at the lower end, but other forms of device included in the path of the core material may have a similar effect and may block the false twist from reaching either or both the pairs of rollers just referred to.
  • the quality of the yarn produced varies to an appreciable extent in accordance with the location of the rotary false twist device along the length of the core material between the two twist-blocking points and according to the invention, the distance of the false twist device from either of these points is not less than one third of the path length of the core material between the points in question.
  • the false twist device is located within the middle third of the path length of the core material between the blocking points and it is found that this leads to a yarn having particularly uniform properties, particularly tensile strength and overall appearance. The best results are achieved when the false twist device is located approximately mid-way between the twist-blocking points.
  • This principle is applicable to both single and double wrapped yarn, but is particularly valuable when applied to a single-wrapped yarn where regularity in the laying-up of the fibres of the core material is most important.
  • the false twist device When producing single-wrapped yarn and thus using only a single rotary spindle, it is found preferable for the false twist device to be at the entry end of this spindle and to be fitted to the spindle to rotate with it. The result of this is that wrapping occurs immediately at the entry end of the spindle and the two components, i.e. the core and the wrapper yarn, will immediately be wrapped together in the same hand and passed down through the spindle in that wrapped state.
  • the false twist device may be located at the exit of the spindle and again it is preferably fitted to the spindle itself so as to rotate with it although it is possible for the false twist device to be.separate from the spindle and to be positively rotated in the same direction as the spindle.
  • the false twist device is preferably mounted between them and the yarn passes to the delivery rollers without any further false twist device.
  • the novel combination of a first rotary spindle followed by a false twist device and a second rotary spindle with no subsequent false twist device leads to a unique formation of double wrapped yarn which cannot be obtained by any other combination of steps and which has greatly superior properties to previously known forms of double wrapped yarn.
  • the wrapper yarn merely makes a relatively long helix around the core material, the number of turns representing the turns of unwinding of the wrapper yarn from the package.
  • the two components become twisted together, i.e. each component follows its own helical path which is in contrast to the straight line path of the core material when no false twist device is included.
  • the wrapped yarn then passes to take-up rollers and after passing through the nip of the rollers the twist may.very slightly relax.
  • the core material shown as 12 is in the form of a sliver supplied by a drafting head comprising a pair of twin aprons 2 and 4 and passing through, a conductor 6 to a pair of delivery rollers 8-and 10.
  • the core material 12 passes through a hollow spindle 16 having a false twist device 14 at its top or entry end.
  • This false twist device may be constructed integrally with the spindle or may be a separate part which is fitted to the top of the spindle, but in either case imparts positive, one-to-one false twist to the core material 12.
  • the false twist device comprises an entry passage 18 and an exit passage 20 between which is located a transverse pin 22 formed with a V groove for locating the yarn centrally of the pin.
  • the diameter at the bottom of the groove is larger than the bore of either the entry passage 18 or the exit passage 20 so that the sliver is deflected from a straight line path and caused to bear against the walls of the two passages so as to be nipped at these two points.
  • the nipping action must be sufficient to cause the sliver to be false twisted - on either side of the pin 22, by curtailing relative rotation between the device 14 and the core material 12, but not great enough seriously to retard the passage of the sliver through the spindle.
  • the resultant false twist on the upstream side of the false twist device will run back to a twist-blocking point defined by the nip of the delivery rollers 8, 10 while the reverse twist on the downstream side will . run to a twist-blocking point defined by the nip of a pair of take-up rollers 24 and 26.
  • a package 28 of filament wrapper yarn is mounted on the spindle 16 so as to rotate with the spindle and the wrapper yarn is drawn off over-end upwardly from the package and then downwardly through the false twist device 14, as seen at 29.
  • the two components i.e. the sliver 12 constituting the core material and the wrapper yarn 27, are twisted together and are drawn downwardly by the take-up rollers 24, 26, after which the wrapped yarn passes around guide members 29 and 30 and a winding roller 32 to be formed into a wound package 34.
  • the spindle 16 is mounted for rotation in a bracket 36 pivoted at 37 and is driven by a belt 38 passing around a pulley 40 at the lower end of the spindle.
  • the false twist device which is again shown as 14 is in the form of a bent wire fitted to the bottom of the spindle 16, to impart positive false twist to the core material 12.
  • the device 14 is positioned mid-way between the two twist-blocking points represented by the delivery rollers 8, 10 and the take-up rollers 26, 28.
  • the wrapper yarn shown as 44 thus wraps around the single wrapped yarn at the entrance to the spindle 40 and the double wrapped yarn emerges at the bottom of the spindle and passes to the take- up rollers 26, 28 before being wound into a package as in Figure 1.
  • the dimensions A and B are equal so that the false twist device 14 is located mid-way between the twist-blocking points formed by the delivery rollers 8, 10 and the pins 25, 27 and is located at the top of the spindle 16 in the same way as in Figure 1.
  • twist-blocking points may be defined either by the delivery and take-up rollers as in Figure 1 or either or both of these points may be defined by some other form of device.
  • the lower twist-blocking point is defined by the pins 25, 27 and a similar arrangement of pins could be provided at the upper end, i.e. just below the delivery rollers, if required.
  • Other forms of twist-blocking device are also possible.
  • Figures 4 and 5 are diagrammatic views of different forms of the preferred apparatus for producing double-wrapped yarn in which the false twist device 14 is mounted between the two spindles, with the improved results previously described.
  • the parts are identified by the same reference numerals as in Figure 3, and it will be seen that in each case there is a first rotary spindle followed by a false twist device and a second rotary spindle with no subsequent false twist device.
  • the false twist device 14 is shown as being in the form of a bent wire, being fitted to the exit end of the first spindle in Figure 4 and to the entry end of the second spindle in Figure 5.
  • the effect of-the device 14 is to apply false twist to the core material 12 which passes back as far as the delivery rollers 8 and 10, being illustrated in each of the two Figures by short lengths of the core material 12 which slope downwardly from left to right.
  • the provision of the device 14 means that the wrapper yarn 29 does not wrap around the core material 12 at the entrance to the spindle, but merely passes down the hollow interior of the spindle with the core material 12 in the form of a long helix indicated by the chain dotted lines sloping steeply from right to left.
  • this helix is shown in Figure 4 as having four turns between the entrance to the spindle 16 and the device 14, these four turns representing the number of turns around the package 28 corresponding to the length of wrapper yarn 29 which has been withdrawn.
  • the false twist is reversed in the core as illustrated by the reverse slope of the short lines representing the core material 12 and, as a result, as previously explained, after leaving the device 14 the core material 12 and the wrapper yarn 29 are twisted together as shown by the alternating solid and chain dotted inclined lines.
  • This false twist is maintained as far as the take-up rollers 26, 28 situated below the second rotary spindle 40 which carries the package 42 of the second wrapper yarn 44.
  • the yarn passes straight through the second spindle 40 although its path may be adjusted to engage either the entrance or the exit of the spindle if required.
  • the wrapper yarn 44 wraps around the combination of the core material 12 and the first wrapper yarn 29 at the entrance to the spindle 40 and continues down the spindle 40 in this configuration as illustrated by the continuous thin lines sloping from left to right between the entrance to the spindle 40 and the take-up rollers 12.
  • the second spindle 40 is illustrated as rotating in the opposite direction to the first spindle 3 and when operating in this manner, it is found preferable that the false twist device 14 should be fitted to the bottom of the first spindle 16, as illustrated in Figure 4.
  • the presence of the second wrapper yarn 44 prevents the appearance of any slack in the turns of the first wrapper yarn 29, leading to a yarn having all the advantages of a double-wrapped yarn, but not the disadvantages.
  • the spindle 40 is turning in the same direction as the first spindle 16, as can be seen from the fact that the turns of the second wrapper yarn 44 slope from right to left in contrast to those in Figure 4.
  • the false twist device 14 is mounted at the entry end of the spindle 40, as illustrated in Figure 5.
  • the false twist device 14 is located approximately mid-way between the delivery rollers 8, 10 and the take-up rollers 26, 28 in the same way as in the other Figures.
  • the core material 12 may be in the form of a sliver formed of synthetic or natural fibres.
  • these natural fibres may be jute which when double-wrapped with nylon filaments bears comparison with a normal spun jute yarn but produced by a simpler and cheaper process.
  • the starting material for the core was a jute sliver of 7.84 grams per metre drafted to twenty four of a draft in a drafting head so as to emerge at the delivery rollers 8,10 as a sliver of 3.1 NM leading to a yarn of 3.1 NM.
  • Both wrapper yarns 27 and 29 were seventy denier nylon mono- or multi-filament. Examination of the product showed that it consisted of a jute core twisted with the first wrapper yarn, the resultant composite being wrapped by the second wrapper yarn.
  • a process in accordance with the invention is susceptible of all the same variations as a normal wrap spinning process.
  • the core may be constituted by any form of textile sliver or other form of bundles of fibres.
  • the process may be readily adapted for the production of an effect yarn by the over-feeding of an effect component as with other wrap spinning processes.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
EP82303076A 1981-06-15 1982-06-14 Procédé et dispositif de guipage Withdrawn EP0067701A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
GB8118327 1981-06-15
GB8118327 1981-06-15
GB8200996 1982-01-14
GB8200996 1982-01-14

Publications (1)

Publication Number Publication Date
EP0067701A1 true EP0067701A1 (fr) 1982-12-22

Family

ID=26279800

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82303076A Withdrawn EP0067701A1 (fr) 1981-06-15 1982-06-14 Procédé et dispositif de guipage

Country Status (1)

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EP (1) EP0067701A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3331197A1 (de) * 1983-08-30 1985-03-07 Fritz 7347 Bad Überkingen Stahlecker Umwindegarnspinnaggregat

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2080051A5 (en) * 1970-02-20 1971-11-12 Chavanoz Moulinage Retorderie Multi-filament textured yarns assembled by - false twisting
GB1309185A (en) * 1970-02-20 1973-03-07 Chavanoz Sa Method and apparatus for the manufacture of fancy yarns
US4228639A (en) * 1978-07-19 1980-10-21 James Mackie & Sons Limited Production of yarn
GB1600129A (en) * 1978-05-19 1981-10-14 Courtaulds Ltd Process and apparatus for spinning yarn
GB1603717A (en) * 1978-05-25 1981-11-25 Mackie & Sons Ltd J Production of yarn

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2080051A5 (en) * 1970-02-20 1971-11-12 Chavanoz Moulinage Retorderie Multi-filament textured yarns assembled by - false twisting
GB1309185A (en) * 1970-02-20 1973-03-07 Chavanoz Sa Method and apparatus for the manufacture of fancy yarns
GB1600129A (en) * 1978-05-19 1981-10-14 Courtaulds Ltd Process and apparatus for spinning yarn
GB1603717A (en) * 1978-05-25 1981-11-25 Mackie & Sons Ltd J Production of yarn
US4228639A (en) * 1978-07-19 1980-10-21 James Mackie & Sons Limited Production of yarn

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3331197A1 (de) * 1983-08-30 1985-03-07 Fritz 7347 Bad Überkingen Stahlecker Umwindegarnspinnaggregat

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Effective date: 19830513

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Withdrawal date: 19850211

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Inventor name: HILL, NORMAN ASH

Inventor name: HUNT, ROBERT JOHN