WO1994019518A1 - Ameliorations concernant des tissus tricotes - Google Patents

Ameliorations concernant des tissus tricotes Download PDF

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Publication number
WO1994019518A1
WO1994019518A1 PCT/GB1994/000303 GB9400303W WO9419518A1 WO 1994019518 A1 WO1994019518 A1 WO 1994019518A1 GB 9400303 W GB9400303 W GB 9400303W WO 9419518 A1 WO9419518 A1 WO 9419518A1
Authority
WO
WIPO (PCT)
Prior art keywords
yarn
twisted
twisting
twist
spirality
Prior art date
Application number
PCT/GB1994/000303
Other languages
English (en)
Inventor
Anthony Primentas
Original Assignee
The University Of Leeds
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 The University Of Leeds filed Critical The University Of Leeds
Priority to AU60080/94A priority Critical patent/AU6008094A/en
Publication of WO1994019518A1 publication Critical patent/WO1994019518A1/fr

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
    • 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
    • D02G3/26—Yarns or threads characterised by constructional features, e.g. blending, filament/fibre with characteristics dependent on the amount or direction of twist
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04B—KNITTING
    • D04B1/00—Weft knitting processes for the production of fabrics or articles not dependent on the use of particular machines; Fabrics or articles defined by such processes
    • D04B1/14—Other fabrics or articles characterised primarily by the use of particular thread materials

Definitions

  • the invention relates to a method and apparatus for treating yarns to be used for the production of knitted fabric, and also a yarn and a fabric produced by the method and apparatus.
  • Spirality which commonly appears in single tubular knitted fabrics. Spirality results due to a lack of perpendicularity between courses and wales as the latter follow a spiral path along the axis of the produced fabric. In the case of flat knitted fabrics, the wales follow a sideways direction at an angle to the perpendicular. According to the direction of the inclined wales, two types of Spirality exist, positive or Z-spirality where there is an inclination to the right side of the vertical fabric axis and negative or S-spirality where there is an inclination to the left side of the vertical fabric axis.
  • Mechanical methods include a way of using balanced doubled (plied - fold) yarns, that is, two component single yarns having equal twist amount and same twist direction are combined and twisted as one unit, in the opposite direction, with an appropriate twist amount.
  • This first method has drawbacks in that, although Spirality is eliminated, the two-fold yarn production is expensive and further a garment, knitted by such yam, is heavier, in fact double in weight.
  • Another method includes knitting two single yarns, of equal and opposite twist liveliness values, per feeder. This method, (similar to the "plating" process) has drawbacks as aforedescribed. Alternatively, two single yarns of equal and opposite twist liveliness values can be used in a method of knitting alternate courses. Even though this method eliminates the overall
  • Chemical methods of eliminating Spirality include correction of the problem by imposing distortion of the fabric so that the wales straighten out and are subsequently set in a straightened form.
  • Setting can be achieved by using resins, heat, steam or mercerization.
  • resins, heat, steam or mercerization are a transient measure, because as soon as the fabric is wet the fault returns.
  • setting the twist of a cotton yam which contains a small percentage of low melt polyester fibres reduces the fibre movements in the yarn but the latter becomes stiff.
  • a method for treating a yarn so as to eliminate Spirality in a knitted fabric comprising:
  • a method for treating a yam so as to eliminate Spirality in a knitted fabric comprising:
  • the invention involves taking a single yarn that has either been twisted and set in a first direction or taking a single yarn which may or may not have been twisted and twisting and/or setting said yarn in a first direction and then treating the yarn as per the above so that said twisted and set yarn is twisted in a second opposite direction with respect to said first direction.
  • Fabrics produced from yarns treated as per the above method typically exhibit no, or at least very little, Spirality before and after processing.
  • the invention also provides for an apparatus that is adapted to treat the yarn according to the aforementioned methods.
  • the invention provides for an apparatus for treating a yarn so as to eliminate Spirality in a knitted fabric by said yarn comprising; a feed means for feeding a single yam, that has been twisted in a first direction and set therein, to a reverse twisting means which twists said yarn in a second opposite direction with respect to said first direction.
  • a yet further aspect of the invention involves the provision of an apparatus which further includes a first twisting means whereby the apparatus is adapted to feed a single yarn to said first twisting means so as to twist the yarn in a first direction and which also includes a first transfer means which transfers said twisted yarn to a setting means where said yarn is set; and also a second transfer means which transfers said twisted and set yarn to a reverse twisting means which twists said yarn in a second opposite direction with respect to said first direction.
  • said apparatus includes a means for extracting said yarn from the spinning frame and/or a means for feeding said treated yam to a knitting machine.
  • an apparatus for eliminating Spirality in a knitted fabric comprising:
  • Yarn thus treated as aforedescribed can then be stored on the second reel member prior to use.
  • said apparatus includes a knitting machine to which said treated yam is transferred so as to produce a knitted fabric.
  • the apparatus will be designed to operate so that yam in accordance with the invention is produced at a rate compatible to the operating rate of the knitting machine.
  • Figure 1 and Table 1 show the Spirality characteristics of a normal and two processed yarns, which processed yarns have been treated in accordance with the method of the invention.
  • Figure 2 and Table 2 show the Spirality characteristics of further yarns treated in accordance with the invention compared to untreated yarns.
  • Figure 3 shows the Spirality characteristics of an untreated yarn compared to a set yarn and a treated yarn.
  • Figure 4 shows the Spirality characteristics of a further yarn compared to a normal yam, a set yarn and a treated yam.
  • Figure 5 shows the Spirality characteristics of a further yarn when treated in accordance with the invention compared to an untreated yarn.
  • the yarn used was a quantity of cotton ring-spun single yarn which was unwaxed and Z-twisted.
  • This yarn was steam set in a steaming machine Sanderson under pressure of 10 psi in 105°C for a time of 20 minutes.
  • the "untwisting" process took place on a two-for-one Volkmann VTS-08 twisting frame.
  • the least tension was used in the "yarn tensioning" accessory in the used spindle of the machine.
  • the twist amount of 111 tpm in S-direction was inserted in the set yarn, leaving the yam with a Z direction twist and an actual measured net twist amount of approximately 620 tpm.
  • the yarn was then knitted on a Wildt Model 5 circular, one feeder (single jersey) machine.
  • the machine had a diameter of 9" and a number of 420 needles (gauge E14).
  • This machine had a cam box revolving in the anti-clockwise direction (as looked at from above) and no arrangement for positive feed of the yarn to the knitting point had been done. After calculation, the loop length was found to be 4.83 mm.
  • the produced fabric was fully wetted by immersion in a basin full of warm water (40-45°C) and dried in normal atmospheric conditions (20°C, 65%)
  • row 1 shows the results of a normal yam both before and after wetting.
  • the angle of Spirality being 31 degrees and 26 degrees respectively.
  • yarns treated in accordance with the invention having a variable degrees of untwist, as referenced by numbers 154, 163, and 175, have a significantly reduced angle of Spirality both before and after wetting, the Spirality before wetting being 2 degrees or less from the vertical fabric axis.
  • the working of the aforementioned method when using a single yam that has been twisted in a first direction and set, involves the provision of at least a reverse twisting means which is adapted to twist said yarn in a second opposite direction with respect to said first direction. Further, said reverse twisting means incorporates a control means such that an operator can determine the degree of reverse twist to be inserted into the yam.
  • the apparatus is further provided with a setting means so that said twisted yarn can be set prior to transferring to said reverse twisting means.
  • the apparatus includes a first twisting means for twisting said yam in a first direction; and suitable means for transferring said yam to a setting means where said yarn is set in said first direction; suitable means for transferring said set twisted yarn to a reverse twisting means where said yam is twisted in a second opposite direction with respect to said first direction.
  • the amount of reverse twist inserted into the yarn will be determined by the amount of twist provided in, and remaining in, the yarn by twisting in said first direction. Ideally, the amount of reverse twist or "untwisting" will equal the amount of first twist provided in, and remaining in said yarn, so as to provide a yarn which is balanced and thus not exhibiting Spirality when a knitted fabric is provided.

Landscapes

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

Abstract

L'invention concerne un procédé et un appareil qui permettent de fabriquer un fil qui, lorsqu'il est tricoté pour fabriquer un tissu, ne présente pas de tendance à l'enroulement. De plus, l'invention concerne un fil et un tissu tricoté obtenus grâce à ce procédé et à cet appareil. On élimine la tendance à l'enroulement du tissu tricoté grâce au traitement du fil qui consiste à en équilibrer les forces de torsion de façon qu'une rotation dans une première direction est contrebalancée par une torsion dans la direction opposée.
PCT/GB1994/000303 1993-02-20 1994-02-15 Ameliorations concernant des tissus tricotes WO1994019518A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU60080/94A AU6008094A (en) 1993-02-20 1994-02-15 Improvements relating to knitted fabrics

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9303425.4 1993-02-20
GB939303425A GB9303425D0 (en) 1993-02-20 1993-02-20 Improvements relating to knitted fabrics

Publications (1)

Publication Number Publication Date
WO1994019518A1 true WO1994019518A1 (fr) 1994-09-01

Family

ID=10730751

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1994/000303 WO1994019518A1 (fr) 1993-02-20 1994-02-15 Ameliorations concernant des tissus tricotes

Country Status (3)

Country Link
AU (1) AU6008094A (fr)
GB (1) GB9303425D0 (fr)
WO (1) WO1994019518A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6073468A (en) * 1998-04-02 2000-06-13 Burlington Industries, Inc. Low torque knit construction
US6530511B2 (en) 2001-02-13 2003-03-11 Medallion Technology, Llc Wire feed mechanism and method used for fabricating electrical connectors
US6584677B2 (en) 2001-02-13 2003-07-01 Medallion Technology, Llc High-speed, high-capacity twist pin connector fabricating machine and method
US6729026B2 (en) * 2001-02-13 2004-05-04 Medallion Technology, Llc Rotational grip twist machine and method for fabricating bulges of twisted wire electrical connectors
CN115559045A (zh) * 2022-09-22 2023-01-03 浙江凯喜雅华蒙针织有限公司 一种发热保暖的凹凸肌理立体面料的加工工艺

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA841978A (en) * 1970-05-19 Commonwealth Scientific And Industrial Research Organization Twisted thread assemblies
EP0068748A1 (fr) * 1981-06-22 1983-01-05 Norsk Tekstilinstitutt Procédé et appareil pour apprêter des tricots de coton

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA841978A (en) * 1970-05-19 Commonwealth Scientific And Industrial Research Organization Twisted thread assemblies
EP0068748A1 (fr) * 1981-06-22 1983-01-05 Norsk Tekstilinstitutt Procédé et appareil pour apprêter des tricots de coton

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6073468A (en) * 1998-04-02 2000-06-13 Burlington Industries, Inc. Low torque knit construction
US6530511B2 (en) 2001-02-13 2003-03-11 Medallion Technology, Llc Wire feed mechanism and method used for fabricating electrical connectors
US6584677B2 (en) 2001-02-13 2003-07-01 Medallion Technology, Llc High-speed, high-capacity twist pin connector fabricating machine and method
US6729026B2 (en) * 2001-02-13 2004-05-04 Medallion Technology, Llc Rotational grip twist machine and method for fabricating bulges of twisted wire electrical connectors
US6971415B2 (en) * 2001-02-13 2005-12-06 Medallion Technology, Llc Rotational grip twist machine and method for fabricating bulges of twisted wire electrical connectors
CN115559045A (zh) * 2022-09-22 2023-01-03 浙江凯喜雅华蒙针织有限公司 一种发热保暖的凹凸肌理立体面料的加工工艺

Also Published As

Publication number Publication date
GB9303425D0 (en) 1993-04-07
AU6008094A (en) 1994-09-14

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