US3720984A - Multi-end knit-deknit process - Google Patents

Multi-end knit-deknit process Download PDF

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Publication number
US3720984A
US3720984A US00104219A US3720984DA US3720984A US 3720984 A US3720984 A US 3720984A US 00104219 A US00104219 A US 00104219A US 3720984D A US3720984D A US 3720984DA US 3720984 A US3720984 A US 3720984A
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yarn
bundle
tube
knitting
knit
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US00104219A
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English (en)
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E Roberson
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EIDP Inc
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EI Du Pont de Nemours and Co
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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
    • D02G1/00—Producing crimped or curled fibres, filaments, yarns, or threads, giving them latent characteristics
    • D02G1/002—Producing crimped or curled fibres, filaments, yarns, or threads, giving them latent characteristics by knitting, weaving or tufting, fixing and then unravelling

Definitions

  • ABSTRACT An improvement in a knit-deknit process wherein a plurality of yarns are angularly converged to a single bundle which is knit into tubing and heat-set. The tube is maintained in a twistless state while being unraveled and the unraveled bundle is separated and taken up as separate yarns.
  • This invention relates to the texturing of yarn by a process known as knit-deknit texturing. More particularly, the invention relates to a method for greatly increasing the productivity of such a process.
  • the knit-deknit process is well known and widely used. It is also known that in circular knitting, more than one yarn can be fed simultaneously to a single needle.
  • no process has been devised, as far as applicant is aware, which successfully utilizes the concept of circular-knitting a plurality of yarns combined as a single end, heat-setting the knit tubing, unraveling the combined single end, separating the unraveled end into the plurality of original yarns, and taking up the individual textured yarns separately. Previous attempts to accomplish this result have failed because twisting and tangling of the individual ends result quickly in yarn-breakage and consequent inoperability.
  • This invention provides a process by which the productivity of a knitting head in knit-deknit texturing can be increased several fold. It further provides a process whereby a'plurality of yarns are knitted and deknitted together, being heat-set intermediately, and the plurality of textured yarns are taken up separately in a continuous operation.
  • the above provisions are accomplished by an improvement in a process for texturing yarn that includes the steps of knitting a single end of yarn into a tube without the introduction of real twist, heat-setting the tube, unraveling the yarn from the tube and winding the unraveled yarn-end into a package.
  • the improvement comprises feeding a plurality of yarn-ends at substantially equal linear speeds from stationary sources along separate-yarn paths, converging the yarn-ends along differently angled paths with respect to each other into a bundle and knitting the bundle into a tube. After heat-setting, the bundle is unraveled from the tube and separated into individual yarn-ends each of which is taken up at about the same linear speed.
  • the knit tube is maintained in a twistless state, i.e., it is collected andthen fed to the unraveling or deknitting operation without permitting the introduction of real twist.
  • provision is made for the relaxation of any false twist introduced by arranging for each feedyarn to converge at a different angle so false twist will be forcibly released by slippage at the point where the yarn-ends converge into a bundle.
  • FIG. 1 is a schematic representation in elevation of one manner of knitting and heat-setting according to this invention.
  • FIG. 2 is a preferred variation of the method of FIG. 1.
  • FIGS. 3 and 4 are topand side-view, respectively, of
  • FIGS. 5 and 6 are analagous to FIGS. 3 and 4, showing deknitting of four ends of yarn.
  • FIG. 7 represents schematically a preferred embodiment of this invention wherein knitting and deknitting are coupled in a single continuous process.
  • FIG. 8 represents a partial elevation of the embodiment of FIG. 4 modified to include an additional tensioning arrangement.
  • a plurality of yarnpackages 12 are provided on a stationary creel 42.
  • Each individual yam-end 10 is led via guides 30 to a single convergence-guide 44 in close proximity to and centered above a circularknitting head 16.
  • Knitting head 16 has a stationary circular bed (not shown) of knitting needles.
  • stationary as applied to creel 42 and the needle-bed of knitting head 16, is meant that the respective devices are not only fixedly positioned in space but also nonrotating.
  • the converged bundle 14 of individual yarn-ends 10 passes from convergence-guide 44 to and through a. single opening 20 in rotating feed-device 18 whereby bundle 14 is fed as if it were a single yarn-end successively to the needles of knitting head 16.
  • a knit-tubing 22 is continuously produced which does not rotate because it is formed on a stationary needle-bed.
  • Tubing 22 is collapsed on passage through nip-rolls 24 to a two-layer flat fabric which is conveyed by cooperating; driven rolls 28.
  • flattened tubing 22 is heat set by exposure to heat sufficient to relieve the forces of distortion due to knitting and to cause bundle 14 to retain subsequently these distortions, i.e., be textured. As shown, heat-setting is accomplished between two heated devices 26 contacting opposite faces of flattened tubing 22.
  • Rolls 28 may be replaced by windup means for tubing 22, may forward tubing 22 to further processing, or may feed the tubing into intermediate packaging.
  • FIG. 2 The variation shown in FIG. 2 is entirely analagous to the description above except between convergenceguide 44 and feed-opening 20 in rotating feed-device l8.
  • Positive-feed yarn-metering devices are frequently employed in circular knitting.
  • device 32 is rotated in timed relation with the knitting speed. It comprises a series of pulleys with high-friction surfaces and stepped diameters. Regardless of which pulleythe bundle 14 engages, the rate of linear feedis positively controlled.
  • the differing diameters of the pulleys provide for differing tensions at the knitting needles, control the tightness of knit stitches, and generally provide a control on quality of resultant yarn-texturing.
  • individual yarn-ends 10 converge at convergence-guide 44 positioned as near as practicable to positive-feed device 32.
  • the yarn-path from guide 44 to device 32 is drawn at an angle for clarity; in practice it would be horizontal to prevent wandering of bundle 14 on device 32.
  • yarn-bundle 14 passes through at least one more guide 46 centered on the axis of rotation of and above rotating feed-device I8.
  • FIGS. 3 and 4 Deknitting of heat-set tubing 50 prepared using two individual ends of yarn is shown in FIGS. 3 and 4.
  • Tubing 50 is collected during knitting without permitting it to twist about its longitudinal axis, and it is fed to deknitting without introducing any such twist, i.e., maintained in a twistless state. It cannot be allowed to fall at random on the floor or to unwind from a stationary roll of tubing 50 because these operations introduce real twist which leads to eventual yarn-breaks.
  • a preferred method for collecting and feeding tubing 50 is to cause it to pleat upon itself in progressive layers by backward and forward alternating folds, as indicated in FIGS. 4 and 6.
  • Bundle 52 is led upwardly to and partly around freely rotatable pulley 54.
  • a relatively long upward path of the bundle 52 is preferred because it helps to disentangle the now intimately associated, individual, textured yarn-ends 70.
  • Use of freely rotatable pulley 54 prevents the backing up of any residual false twist.
  • yarnbundle 52 progresses to the separation-guide (or eye) 56 beyond which individual heat-set yarn-ends 70 are conveyed along angularly separated paths. Angular separation of yarn-ends 70 at this point forces the relief of any false twist remaining in bundle 52.
  • Additional guides 58 lead textured yarns 70 to windup on separate winding devices 60.
  • each yarn 70 may run over freely rotatable fixed rolls 63 down to and around a vertically displaceable freely rotatable roll 64, the vertical displacement of which may be used to generate electric signals which, in turn, can correct the rotational speeds of windups 60 (FIG. 8).
  • FIGS. 5 and 6 show deknitting of four ends of textured yarn 70. This is substantially as just described for two ends. As the number of yarn-ends 70 in bundle 52 increases, there is a corresponding reduction of yarntension per end which results in a tendency for the ends to resist separation. Particularly when more than two individual yarn-ends 70 are involved, passage of bundle 52 through a tensioning device 66 located between pulley 54 and separation-guide 56 promotes disassociation of the ends before physical separation. Improved separation is also promoted if the opening in separation-guide 56 is relatively large, e.g., 0.5-1.0 inch.
  • FIG. 7 shows schematically, with elements numbered consistently with the preceding Figures, a preferred process of the present invention wherein the knitting and deknitting operations are directly coupled.
  • the bundle 52 is continuously deknitted at 72 and led over pulley 54, to separation-guide 56, and thence as individual yarn-ends to windups 60.
  • a key requirement of successful knit-deknit processing using plural ends of yarn is that no real twist be inserted at any point.
  • Use of a stationary creel and a stationary circular-knitting needle-bed assures the absence of real twist during knitting.
  • Prevention of any of of the knit-tubing before and during deknitting assures the continued absence of inserted real twist.
  • Any real twist in the feed-yarns 10 as they leave their packages 12 on creel 42 is, of course, of no consequence.
  • each individual textured yarn 70 be wound up at the same average linear rate based on straightened yarn-length. Otherwise, slack accumulates in one or more yarn-ends leading eventually to snarling and yarn-breaks. All individual yarns 10 are led to knitting head 16 at identical linear rates. This is ordinarily assured by the friction from multiple guides 30 in the path of each yarn 10. It is preferred, however, to use a positive-feed yarn-metering device such as device 32 of FIG. 2. Likewise, it is ordinarily effective in the winding of textured yarns 70 to obtain equal linear rates by operating the plurality of windups 60 at identical speeds.
  • Heat-setting need not be directly coupled with knitting but may occur, as is well know, in an entirely separate step, e.g., in an autoclave.
  • the plurality of feed-yarns converged for knitting need not be identical. Novel texturing effects result, for example, if the yarns differ in denier, in heat shrinkage, or in both of these properties.
  • knit-deknit textured yarns The utility of knit-deknit textured yarns is well established. Their use in sheer knit stocking is well known. A particularly effective use of these yarns involves beaming them and using the beam of textured yarns as the backbar in crepe fabrics.
  • EXAMPLE I Two ZO-denier monofilaments of normally drawn nylon'66 textile yarn are knit-deknit textured substantially as shown by the combination of FIGS. 1, 3 and 4.
  • the knitting device is a circular-knitting machine with both stationary creel and stationary circular needlebed. Feed-rate of each yarn to the knitting head is 683 yd./min.
  • the heat-setting plates are maintained at surface-temperatures of 350F.
  • the heat-set knit tubing is collected by folding it carefully back and forth upon itself without permitting any twist.
  • the knit tubing is gradually unfolded, again without permitting any twist of the tubing.
  • Pulley 54 is about 6.5 feet above the tubing.
  • a space of about 5 feet is provided between pulley 54 and separationguide 56.
  • Guides 58 first downstream of separationguide 56 are about 2 feet apart and each 3 feet from separation-guide 56.
  • Identical gate-tension guides 62 are employed.
  • the two windups 60 are positions on a Kidde-Sipp spooler positively driven at identical peripheral velocities of 240 yd./min.Deknitting is continuous and trouble-free when the yarn-bundle is fed from either end of the knit tubing. Comparison of the two textured ends shows the two to be equivalently textured with extremely uniform saw-tooth-like crimp.
  • the latter is characterized by relatively long straight portions of yarn in zigzag arrangement with relatively short sharply rounded apices.
  • Example .I is repeated in every detail except that a positive-feed yarn-metering device as described in connection with FIG. 2 is employed. Equivalent operation and results are obtained.
  • Example II is repeated with the substitution of 70-denier 34-filament normally drawn nylon-66 textile yarn.
  • the windup rate for the textured yarn is about 500 yd/min. Size, shape and dimensions of the uniform saw-tooth-like crimp are substantially the same as obtained in Examples I and II.
  • EXAMPLE lV Three ends of ZO-denier nylon-66 normally drawn textile monofilament are knitted into tubing as shown in FIG. 2. Feed-rate of each yarn is about 600 yd./min. Heat-setting is accomplished using a heater temperature of 350 F. The heat-set tubing is collected and transported in the pleated fashion described so as to prevent the insertion of any real twist.
  • Deknitting is accomplished essentially as shown in FIGS. 5 and 6 with the exception that three rather than four ends are involved and that, after passing separately through guides 58, the textured ends are reconverged for windup together on a single roll 60. This latter step accomplishes the same effect as winding onthree rolls 60 all operated at identical speeds. Windup is at about 500 yd./min./end.
  • Pulley 54 is about 6.5 feet above the pleated supply of tubing 50; yarntension device 66 is about 3 feet from pulley 54; separation-guide 56, with inside diameter of about 1 inch, is about 8 feet from yarn-tens'ioner 66 to provide plenty of distance for complete relief of false twist; guides 58 are positioned about 3 feet from separationguide 56 and spaced to provide about 25 degrees separation between adjacent yarn-paths; and the individual ends are reconverged at the windup 60 about 2 feet from guides 58.
  • the uniform zigzag crimp obtained is very similar to that of Examples I-III, but the apices between relatively shorter straight sections are more broadly rounded.
  • Example IV is essentially duplicated except for utilizing four ZO-denier monofilaments rather than three and for utilizing the number 4 setting of the Stehedco UTC Tension Device.
  • the four ends are pulled form separation guide 56 along; paths separated by about 25 (as shown in FIG. 5) and are then reconverged for winding on a single roll. 60.
  • the four ends exhibit uniform regular crimp similar to that of the previ-v ous examples, the apices being sharper than those for Example IV.
  • a process for texturing yarn that includes the steps of knitting a single end of yarn into a tube without the introduction of real twist via a circular knitting machine having a cylindrical needle bed and a feed device for applying yarn to the needles, heat-setting the knit tube, unraveling said yarn from said tube and winding the unraveled yarn into a package, the improvement comprising: feeding a plurality of yarn ends at substantially equal linear speeds from sources along separate paths, said sources and said cylinder maintaintwist; unraveling said bundle from said tube while maintaining said tube in a twistless state; separating said bundle into yarn ends and taking up each end at about the same linear speed.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Knitting Of Fabric (AREA)
  • Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
US00104219A 1971-01-06 1971-01-06 Multi-end knit-deknit process Expired - Lifetime US3720984A (en)

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US10421971A 1971-01-06 1971-01-06

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US (1) US3720984A (fr)
BE (1) BE777658A (fr)
CA (1) CA949304A (fr)
FR (1) FR2121266A5 (fr)
GB (1) GB1320830A (fr)
IT (1) IT961130B (fr)
ZA (1) ZA717404B (fr)

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3849847A (en) * 1971-11-29 1974-11-26 C Corbiere Process for storing textile filaments in knitted form
US3919749A (en) * 1973-04-09 1975-11-18 Pharr Yarns Inc Method for producing space-dyed textured yarn
US4185364A (en) * 1976-05-21 1980-01-29 Roselon Industries, Inc. Method of making multicolored yarn
US4193252A (en) * 1978-06-28 1980-03-18 Hitco Knit-deknit method of handling yarn to produce carbon or graphite yarn
US4870839A (en) * 1987-12-22 1989-10-03 Asheboro Elastics, Corp. Apparatus for deknitting elastic yarns
EP1026294A1 (fr) * 1999-02-02 2000-08-09 Falke AG Procédé pour la production d'un fil
US6301937B1 (en) * 1998-12-02 2001-10-16 Globe Manufacturing Corporation Apparatus and method for deknitting yarns
US6321427B1 (en) * 1999-09-09 2001-11-27 Polyloom Corporation Of America Knit-deknit yarn and method and apparatus for making same
US6694582B1 (en) * 1999-04-14 2004-02-24 Mehmet Agrikli Method and machine for unraveling knitted fabrics
US20080098581A1 (en) * 2006-10-30 2008-05-01 Superba Process for treating threads by knitting-unraveling
FR2907798A1 (fr) * 2006-10-30 2008-05-02 Superba Sas Procede de traitement de fils par tricotage-detricotage
CN101831737A (zh) * 2010-06-02 2010-09-15 常熟市名佳化纤有限公司 一种卷曲丝的加工方法
US12123112B2 (en) 2016-04-25 2024-10-22 Ronak Rajendra Gupta Method for manufacturing a multi-ply separable filament yarns and multi-ply separable textured yarn

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2252107A (en) * 1991-01-26 1992-07-29 James Raymond Hannah Separating the strands of a yarn

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US911656A (en) * 1906-04-17 1909-02-09 Novelty Hosiery Company Plating device for knitting-machines.
US1023311A (en) * 1907-02-15 1912-04-16 Emil A Hirner Plating device.
FR1453387A (fr) * 1965-07-26 1966-06-03 Textile Machine Works Fil texturisé et procédé et machine pour sa fabrication
US3321818A (en) * 1965-03-30 1967-05-30 Deering Milliken Res Corp Slub catcher
US3333441A (en) * 1965-03-29 1967-08-01 Textile Machine Works Apparatus for making textured yarn
US3568277A (en) * 1965-07-22 1971-03-09 Klinger Mfg Co Ltd Method of crimping yarn

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US911656A (en) * 1906-04-17 1909-02-09 Novelty Hosiery Company Plating device for knitting-machines.
US1023311A (en) * 1907-02-15 1912-04-16 Emil A Hirner Plating device.
US3333441A (en) * 1965-03-29 1967-08-01 Textile Machine Works Apparatus for making textured yarn
US3321818A (en) * 1965-03-30 1967-05-30 Deering Milliken Res Corp Slub catcher
US3568277A (en) * 1965-07-22 1971-03-09 Klinger Mfg Co Ltd Method of crimping yarn
FR1453387A (fr) * 1965-07-26 1966-06-03 Textile Machine Works Fil texturisé et procédé et machine pour sa fabrication

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3849847A (en) * 1971-11-29 1974-11-26 C Corbiere Process for storing textile filaments in knitted form
US3919749A (en) * 1973-04-09 1975-11-18 Pharr Yarns Inc Method for producing space-dyed textured yarn
US4185364A (en) * 1976-05-21 1980-01-29 Roselon Industries, Inc. Method of making multicolored yarn
US4193252A (en) * 1978-06-28 1980-03-18 Hitco Knit-deknit method of handling yarn to produce carbon or graphite yarn
US4870839A (en) * 1987-12-22 1989-10-03 Asheboro Elastics, Corp. Apparatus for deknitting elastic yarns
US6301937B1 (en) * 1998-12-02 2001-10-16 Globe Manufacturing Corporation Apparatus and method for deknitting yarns
EP1026294A1 (fr) * 1999-02-02 2000-08-09 Falke AG Procédé pour la production d'un fil
US6301759B1 (en) * 1999-02-02 2001-10-16 Falke Kg Yarn, process for producing a yarn, and textile fabric
US6694582B1 (en) * 1999-04-14 2004-02-24 Mehmet Agrikli Method and machine for unraveling knitted fabrics
US6321427B1 (en) * 1999-09-09 2001-11-27 Polyloom Corporation Of America Knit-deknit yarn and method and apparatus for making same
US20080098581A1 (en) * 2006-10-30 2008-05-01 Superba Process for treating threads by knitting-unraveling
FR2907798A1 (fr) * 2006-10-30 2008-05-02 Superba Sas Procede de traitement de fils par tricotage-detricotage
FR2907799A1 (fr) * 2006-10-30 2008-05-02 Superba Sas Procede de traitement de fils par tricotage-detricotage
EP1918432A1 (fr) * 2006-10-30 2008-05-07 SUPERBA (Société par Actions Simplifiée) Procédé de traitement de fils par tricotage - détricotage
US7814627B2 (en) * 2006-10-30 2010-10-19 Superba Process for treating threads by knitting-unraveling
CN101173415B (zh) * 2006-10-30 2013-03-13 苏佩尔芭股份有限公司 通过编织-拆线来处理线的方法以及线处理作业线
CN101831737A (zh) * 2010-06-02 2010-09-15 常熟市名佳化纤有限公司 一种卷曲丝的加工方法
US12123112B2 (en) 2016-04-25 2024-10-22 Ronak Rajendra Gupta Method for manufacturing a multi-ply separable filament yarns and multi-ply separable textured yarn

Also Published As

Publication number Publication date
ZA717404B (en) 1972-07-26
FR2121266A5 (fr) 1972-08-18
CA949304A (en) 1974-06-18
GB1320830A (en) 1973-06-20
BE777658A (fr) 1972-05-02
IT961130B (it) 1973-12-10

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