US3358433A - Collection of synthetic polymeric yarns or filaments - Google Patents

Collection of synthetic polymeric yarns or filaments Download PDF

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Publication number
US3358433A
US3358433A US581864A US58186466A US3358433A US 3358433 A US3358433 A US 3358433A US 581864 A US581864 A US 581864A US 58186466 A US58186466 A US 58186466A US 3358433 A US3358433 A US 3358433A
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winding
speed
spindle
package
slow
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US581864A
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Harold E Curtis
Johnson Bryan Kingsley
John P Russell
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Imperial Chemical Industries Ltd
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Imperial Chemical Industries Ltd
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    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01H—SPINNING OR TWISTING
    • D01H1/00—Spinning or twisting machines in which the product is wound-up continuously
    • D01H1/14—Details
    • D01H1/20—Driving or stopping arrangements
    • D01H1/28—Driving or stopping arrangements for two or more machine elements possessing different characteristics but in operative association
    • D01H1/30—Driving or stopping arrangements for two or more machine elements possessing different characteristics but in operative association with two or more speeds; with variable-speed arrangements
    • D01H1/305—Speed control of the spindles in response to the displacements of the ring rail

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  • This invention relates to a method and apparatus for winding yarn packages especially of synthetic polymeric filaments or yarns, and is particularly concerned with the collection of such filaments in the form of packages on bobbins mounted on rotating spindles, in conventional drawing apparatus, or other forms of over-end winding apparatus of the kind in which the filaments are fed to the spindles via rotating processing rolls, and the completed packages are brought to rest before being dotted, and the empty bobbins are brought from rest up to an initial operable rotational speed after the filaments have been secured thereto for rotation therewith.
  • Over-end winding apparatus may, for example, have a ring-and traveller yarn guide around each spindle, or comprise cap-spinning apparatus; :but for convenience in describing the invention in this specification it will be assumed that the apparatus has a ring-and-traveller yarn guide, although it must be understood that the present invention applies also to other forms of over-end winding apparatus.
  • the packages produced by such apparatus will usually be tapered in form.
  • drawing we mean that a filament of synthetic polymeric material is stretched to cause the molecules to orientate themselves along the filament axis, thus increasing the tenacity of the filament.
  • the filament may pass between the nip of two cooperating draw rolls, or be wrapped around a single roll, or around a pair of co-operating rolls comprising a rotating roll and separator roll, which latter may be rotating or stationary.
  • the winding apparatus may include programming means arranged to vary the speed of the spindle throughout the major part of the winding of each package, for some particular purpose; and the present invention is particularly, but not exclusively, concerned with such overend winding apparatus in which it is possible so to vary the value of the spindle speed according to a desired programme.
  • the spindle speed is equal in magnitude to the traveller speed plus the winding-on speed of the filament, this latter term being the fraction of spindle speed corresponding to the winding-on of the filament, and being equal in magnitude to the spindle speed if the traveller is stationary.
  • the traveller speed should not, under known conditions, be allowed to exceed 7000 r.p.m., except transiently, otherwise the yarn guide device will be subjected to excessive stresses, and unacceptable wear and breakage will ensue.
  • the spindle speed may be connolled to control the balloon tension of the filament, and it may be shown that the balloon tension of the filament, and hence the winding-on tension, is proportional to the square of the traveller speed and is inversely proportional to the instantaneous value of the package diameter.
  • the yarn balloon tension may be maintained at a constant value.
  • the traveller of a ring-and-traveller yarn guide may be considered to be primarily a Wind-on guide, the speed of which controls the yarn winding-on tension, and not a means of inserting twist into the yarn.
  • the balloon tension be maintained at a substantially constant value throughout the Winding operation, because fluctuations in this value may cause streaks to occur in the fabric into which synthetic polymeric filament yarn is eventually made-up, stress differences between different parts of the package being the cause of barre and being a cause of warp stripes in Woven fabrics.
  • the filament be tensioned to an extent above a certain minimum value so that a stable balloon be maintained, and the manner of the lay of the filament on the package be predicted, and the filaments arranged to be securely laid on the package and not tending to slough off it.
  • the rotating traveller is used to tension the running filament to the requisite amount in order that a stable balloon may be obtained throughout the winding operation, the balloon being tensioned to an amount of at least 0.1 gram per denier in the case of a polyamide filament, and the spindle speed is so programmed that the traveller speed is held within a predetermined narrow range of values.
  • this condition should be maintained during the start-up and slow-down periods in the formation of each package, because, due to the reasons given above, such a condition will reduce the propensity of the filament to break during these periods (filament breakages being more likely to occur at these periods in the package winding cycle, than intermediate therebetween)
  • the present invention is concerned with obtaining such a winding condition while the winding machine is slowing down, by the provision of positive programming means arranged to control the spindle speed during this period. During this period also, loops tend to be formed on the package, if filament breakages are avoided, and the spindle speed programme during this period is therefore arranged to be such that both kinds of irregularities in the Winding operation are reduced.
  • the traveller must accelerate to compensate for the reduced winding-on speed, until when no filament is being delivered, then none of the filament is wound onto the package and the balloon will speed up until its rotationed speed is equal to that of the spindle. This increase in traveller speed and reduced winding-on speed accounts for the increase in the twist insertion rate.
  • the increased twist runs back up the filament and may cause a wrap of the filament to slip off the draw rolls, when these comprise a co-operating draw roll and separator roll.
  • the sudden concomitant increase in the amount of filament in the balloon will cause a complete yarn loop to be wound onto the package.
  • Single filament loops may, however, be caused in the threadline even if complete yarn loops are not produced; and these single filament loops are equally prejudicial to the usage of the yarn.
  • Winding apparatus having a programmed winding procedure, and in particular a programmed slow-down procedure, will be less likely to suffer from between doff variations in the winding operation, and hence there is less likelihood of uncontrollable variations in package weight occurring, compared to winding apparatus which is not controlled in such a positive manner.
  • This wastage of the filament will be particularly important if heavy denier yarns are being processed on the machine, which yarns usually are desired to have as high a throughput rate as possible and have a relatively shorter package winding cycle.
  • the presence of loops in the package will also cause package instability at their locations and this will cause a transient relatively large reduction in the take-off tension'of the filament at this point when unwinding the filament from the package.
  • the package will, therefore, be unsuitable for use on a creel where the filament of one package is connected to the filament of an adjacent package.
  • the extent of the restraint applied by braking means for the spindles will vary, if the means is required habitually to apply a relatively heavy braking restraint, and this means will require constant re-adjustment. Meanwhile the manner of operation of the machine will have varied, with a consequent rise in the filament loop rate. Further, if heavy breaking is required, this implies an expensive and complicated braking system which will means additional maintenance for the machine.
  • the spindies or say, a group of four spindles are driven by a single tape, each spindle being in frictional contact with the tape.
  • the substantially uncontrollable manner in which the spindles are brought to rest implies that the winding operation will vary between different spindles driven by the same tape, and between the same spindle in diiferent package winding cycles.
  • overend winding apparatus of the kind specified has a'motor adapted to drive the spindies separately from the draw rolls, the draw rolls themselves being driven by another motor, e.g., that of the main drive means of the machine, characterised in that programming means is provided to control the winding operation of the apparatus in a positive manner at least during the slow-down period of the full package winding cycle, said programming means including a servo device for controlling the spindle drive motor, tacho-generators for the draw rolls and spindles respectively to monitor their speeds and produce electrical signals related thereto and a reference error unit adapted to compare said electrical signals during said slow-down period and to feed a resultant electrical signal therefrom to said servo device.
  • the spindle drive means may comprise a DC. motor, the operation of such a motor being relatively easy to programme; and the draw roll drive means, comprising the main drive means of the machine, may be an AC. induction motor.
  • the manner of operation of the DC. motor is controlled by the servo device, which may comprise a 3-phase magnetic amplifier the input of which is controlled by a pre-amplifier, the current from a rectifier positioned across one phase of the electrical supply to the device comprising the shunt field excitation current for the motor.
  • the servo device may comprise a 3-phase magnetic amplifier the input of which is controlled by a pre-amplifier, the current from a rectifier positioned across one phase of the electrical supply to the device comprising the shunt field excitation current for the motor.
  • the programming means includes a first tacho-generator arranged to monitor the spindle speed, a second tachogenerator arranged to monitor the draw roll speed during the slow-down period, and a reference error unit arranged to compare the signals produced by both tachogenerators and to feed a signal to the spindle drive means servo device, this latter signal being such that the spindle speed is in a predetermined relationship to the draw roll speed during the first part of the slow-down period, i.e., while the draw rolls are rotating.
  • a signal of magnitude sufiicient to maintain the spindle speed at the desired corresponding value when the draw rolls have stopped is arranged by the reference error unit to be compounded with the signal which would maintain strict proportionality between the spindle speed and the draw roll speed, and the composite signal is fed to the spindle drive means servo device.
  • the second tacho-generator i.e., that which is coupled to the draw roll drive shaft, is connected to a zero-speed sensing device, which devices is operably connected to brake means for the spindles and actuates this brake means when it has sensed that the draw rolls have stopped, so that the spindles are stopped by the brake means as soon as possible after the draw rolls have been brought to rest.
  • the programming means is arranged to ensure that the spindles are driven by their associated DC. motor against light braking restraint throughout the first part of the slow-down period, so that this motor does not tend to hunt.
  • the programming means may include means capable of adjustment initially during the setting up of the winding apparatus, which means will ensure that the transference of the winding apparatus from its normal procedure to its slow-down procedure occurs in a smooth manner without an abrupt change in either the spindle speed or the traveller speed.
  • the programming means is capable also of controlling some aspect of the winding operation throughout the major part of each package winding cycle.
  • the spindle speed is programmed so that an abrupt increase in the rotational speed of the spindle occurs at each of a series of predetermined times in the winding cycle of a package during which the mean spindle speed is generally reduced.
  • Such abrupt increases in spindle speed are provided at the times of winding when, due to the conditions of winding a region of patterning in the lay of the filaments can otherwise be expected to occur.
  • the arrangement may be such that the programming means has a modified form during the slow-down period of a package winding cycle, compared with that employed during the major part of the package winding cycle.
  • the programming means when controlling the spindle speed throughout the major part of each package winding cycle includes a potentiometer, the position of the slider of this potentiometer being controlled by a cam embodying the desired winding programme for the normally operating part of each package winding cycle, and the output signal from this part of the programming means is fed to the reference error unit.
  • the output of the potentiometer comprises a variable reference signal, which is compared by the reference error unit with the output of the first tacho-generator, i.e. that operably coupled to the spindles and arranged to monitor their speed, and the reference error unit is arranged to produce an error signal which is fed to the spindle drive means servo device to adjust the setting thereof.
  • the present invention resides in a method of winding a package by overend winding apparatus of the kind specified, which method comprises programming at least the slow-down period of the package winding cycle comprising a start-up period, a main winding period and a slow-down period, said programming of the slow-down period in said package winding cycle being such that the spindle speed is positively controlled in a predetermined relationship to the draw roll speed during the first part of said period until the draw rolls become stationary, whereafter the spindle is brought to rest.
  • the above-mentioned predetermined relationship may comprise two components, the first component being the maintenance of strict proportionality between the spindle speed and the draw roll speed while the latter is finite, and compounded therewith a component which alone would maintain the spindle speed at a constant value of a magnitude sufiicient to sustain a stable balloon with the draw rolls stopped.
  • the spindle is arranged to be brought to rest as soon as is practical thereafter.
  • a light braking restraint may be arranged to be applied to the spindle during the first part of the slow down period, and the spindle drive means is controlled so as to drive the spindle against this light braking restraint, out such that the above-mentioned predetermined relationship is obtained.
  • the spindle speed is prevented from hunting about its requisite value.
  • FIGURE 1 is a sketch of the various instrumentalities of a conventional draw-twist machine
  • FIGURE 2 shows graphically a desirable slow-down programme according to the invention
  • FIGURE 3 is a block diagram of a means for programming the main portion of the winding cycle of the apparatus of FIGURE 1;
  • FIGURE 4 is a block diagram of said means when modified to programme the slow-down portion of the winding cycle, according to the invention.
  • Snubbing devices which impose a substantial restraint on the running filament, may be included in the apparatus, so that there may be a single drawing zone or several such zones, and possibly also regions in which the yarn may relax or be subjected to some other treatment process.
  • the first pair of rolls which engage the yarn are feed ro ls forthe apparatus, and between these and the final pair of rolls, which are positioned immediately before the winding apparatus, and which are herein referred to as draw rolls, the filament is stretched to many times its original length.
  • a polyamide filament 1 is withdrawn from a cheese 3 mounted on a container 5, and passes through yarn guide means 7, 9, ll, 13 to a pair of co-operating nip rolls 15, 15 From these nip rolls, which serve as positive feed rolls, the filament is wrapped around an inclined snubbing pin 17, which causes a considerable physical restraint to be imposed on the filament resulting in the filament necking and being stretched to, say, five times its original length.
  • the filament then passes around draw roll 19 with its inclined separator roll 21, which rolls, which forward the filament to a balloon guide 23 and thence to winding apparatus.
  • the winding apparatus comprises a vertically extending spindle 25 on which a tube 27 for the yarn package 29 is rotatably mounted, and around which spindle yarn guide means is disposed for causing the filament to be laid on the package.
  • the yarn guide means is in the form of a conventional ring 31 and traveller 33 device mounted on a ring rail 35 this ring rail being reciprocated along the spindle axis by a known form of builder mechanism, including a striker plate 37 secured to the ring rail for reciprocation therewith. At each end of each reciprocation stroke the plate is arranged to operate a microswitch (not shown) and so cause reversal in the direction of movement of the ring rail.
  • the positions of the microswitches are controlled respectively by two cams rotatably mounted on a shaft driven at a constant speed.
  • the main drive means for the drawtwist machine comprises an AC. induction motor coupled to each of the feed rolls and the draw rolls of the machine, but not to the spindles on which the packages are being formed, the spindles arranged to be driven by a separate DC. motor.
  • the drive means of the draw-twist machine is in two parts, and hence both the spindles and the draw rolls can be allowed to accelerate and decelerate independently of each other during the start-up and slow-down periods of each package winding cycle.
  • an electrical timer is included in the winding apparatus, this timer being arranged so that the draw rolls (and the feed rolls) are not driveably connected to the AC. motor until after the spindles have been driveably connected to the D.C. motor.
  • the setting of the timer is adjustable manually.
  • the traveller speed of the yarn guide should at no time during this period be permitted to exceed the highest speed of the range it should start at this speed when the draw rolls have started to rotate, or rise to it soon after they have started to rotate. As a result the traveller speed will then fall to a value near to its minimum acceptable speed when the draw rolls have obtained their maximum speed.
  • the spindles are arranged to obtain their maximum speed, i.e., their requisite speed according to the winding programme at the end of the start-up period, either at the same time as or b.-
  • the time taken for the draw rolls to be brought up to speed should be as short as possible, for productivity reasons, and such that the waste bunch, which is wound during this time, is not too large.
  • the AC. motor is arranged to drive the draw rolls at a constant speed, which speed is related to the desired processing speed for the apparatus.
  • the DC. motor is arranged to drive the spindles according to a predetermined winding programme during this period, in order that some desired object, with respect to the winding operation, may be obtained.
  • the spindle speed may be arranged to be reduced throughout the winding operation in a manner which maintains the balloon tension at a constant value by arranging that the ratio of the square of the traveller speed to the package diameter is constant throughout.
  • the balloon tension is maintained at a value in the range 0.1 to 9.5 gram per denier during the winding operation, otherwise the balloon tension may change by as much as 250%.
  • the traveller speed is maintained at a value in excess of 2500 rpm. but preferably below 4000 rpm.
  • the balloon formed by the over-end winding apparatus will be stable throughout the whole of the winding operation, the manner in which the filament is laid on the package will be predictable, and the balloon tension will be maintained within the desired narrow range of values. In this way, barre and warp stripiness will be reduced, if not eliminated, in the fabrics into Which a filament wound in this way is eventually made-up.
  • the spindle speed can be arranged to be varied throughout the winding of a package in accordance with the profile of a cam embodying the desired spindle speed programme.
  • the DC. motor driving the spindles is arranged to be controlled by a servo device, which in turn is controlled by the cam, this cam being arranged to be rotated at a constant speed by being rotatably mounted on the shaft comprising the ring-rail traverse cam drive means.
  • the servo control device for the DC. motor comprises a E-phase magnetic amplifier, the input of which is conrolled by a pro-amplifier.
  • the motor armature voltage comprises the output from the magnetic amplifier, and the current from a rectifier positioned across one phase of the electrical supply to the device comprises the shunt field excitation current for the motor.
  • the programming cam is used to produce a reference signal, which varies in accordance with the winding programme, and the spindle speed is monitored continuously by means of the first tacho-generator operably coupled to the output shaft of the DC. motor.
  • the reference error unit compares the signal from the first tacho-generator with the reference signal.
  • the error signal obtained by this comparison is then used to alter the output of the DC. motor by being fed to the pre-amplifier of the servo control device and so alters the magnitude of the current fed to the armature of the motor.
  • the cam follower comprises the slider of a linear potentiometer, and the output from this potentiometer is the reference signal.
  • Trimming rotary potentiometers are provided at each end of the linear potentiometer of the programming means, each such rotary potentiometer having a range approximately 20% of the linear potentiometer range and being used to control the efiective range of the linear potentiometer.
  • balloon tension be maintained within a similar narrow range of value during the slowdown period also, so that breakages may be reduced or avoided during this period.
  • the optimum slowdown conditions required to be reproduced by the winding apparatus in winding a yarn of 40 denier polyhexamethylene adipamide, for instance, are that the traveller speed shall not fall below 2500 r.p.m. while the draw rolls are rotating and the filament is being wound in order that a stable balloon may be maintained and that the spindles shall be brought to rest as soon as practicable after the draw rolls whereby there will be a reduction in the number of filament breakages and loops.
  • both the spindles and the draw rolls will tend to run-on when the motors are de-energised, and in any event they will decelerate at rates which are independent of each other.
  • the AC. motor driving the draw rolls may be switched-off so that the draw roll speed is allowed to decay normally.
  • the second tacho-generator is provided to monitor the speed of the draw rolls, and during the first part of the slow-down period, the output signal from this second tacho-generator is fed to the reference error unit.
  • connection of the second tacho-generator to the reference error unit, and the disconnection of the programme cam potentiometer therefrom, is caused :by the programming means upon the transference of the winding apparatus from its normal operating procedure to its slow-down procedure.
  • the reference error unit compares this signal with that from the first tacho-generator monitoring the spindle speed, and feeds back a signal to the DC. motor to drive it, so that the two motors slow down at a predetermined ratio.
  • the programming means causes another signal to be compounded with the above-mentioned signal, the magnitude of which second signal is such that, alone, it would cause the spindles to be driven at above the minimum value of, say, 2500 r.p.m.
  • This second signal is produced by a traveller speed potentiometer which is positioned across a fixed voltage. When the apparatus is idle, this potentiometer is adjusted to give the desired voltage determined empirically previously, and the programming means places this potentiometer across the first tacho-generator, which is coupled to the DC. motor drive shaft, when the slow-down procedure is initiated.
  • the traveller speed will be near to the minimum acceptable value (i.e., 2500 r.p.m. for 40 denier yarn) at the start of the slow-down period.
  • FIGURE 2 The above referred-to programme for the slow-down period of the package winding cycle is shown graphically in FIGURE 2, in which the full lines indicate the actual speed/ time programmes of the spindle and draw rolls respectively, and in which the dotted line indicates the speed/time programme for the spindle corresponding to the first component of the predetermined relationship of spindle speed to draw rolls speed.
  • a changeover speed potentiometer positioned across the second tacho-generator, i.e., that which is operably coupled to the draw rolls.
  • the programming means is arranged to actuate the spindle break means, and during the initial setting-up of the winding apparatus, with the apparatus operating and with the brake means in this position, this means is adjusted so that the DC. motor armature current is at a low, finite, but detectable value. Hence, the spindle drive means will not hunt during the first part of the slowdown period.
  • the zero-speed sensing device coupled to the second tacho-generator is arranged also to control the spindle braking means.
  • the arrangement is such that, when the sensing device detects that the second tacho-gener-ator is registering zero-speed for the draw rolls, the sensing device causes the spindle braking means to be actuated to cause maximum braking restraint to be applied to the spindles, which is the condition required to avoid the occurrent of slow-down loops on the package being wound.
  • the sensing device is also operably coupled to the spindle drive means servo device during the slow-down period, and upon the activation of the braking means by the sensing device, at the end of the first part of this period, the sensing device simultaneously causes the de-energisation of the DC. motor driving the spindles. Thus, there is nothing counteracting the torque applied by the braking means on the spindles.
  • a second variable timer is included in the apparatus so that the movement of the ring rail of the winding apparatus is controlled during the slow-down period.
  • the ring rail is stopped at a predetermined time after the initiation of the slowdown programme, this delay being such that the ring rail is stopped after the draw rolls have stopped.
  • the spindles tend to run-on after this time, even under maximum braking forces, particularly it relatively large packages are being wound at relatively high speeds.
  • the timer delaying the start of the AC. motor driving the draw rolls was set at a value in the range 3.0 to 5.5 seconds, say 4 seconds, and the acceleration of the draw roll was such that it reached its maximum peripheral speed of 4200 feet per minute, say 3000 r.p.m., in a further 4.0 seconds.
  • the spindles accelerated to 3000 r.p.m. in 1 second and reached maximum speed of 11,000 r.p.m. in 8 seconds.
  • the spindle brake is then adjusted to apply a maximum braking torque to the spindles and these are then brought to rest in a further 2 seconds, the DC. motor having been cut oft" simultaneously with the application of the maximum braking torque to the spindles.
  • the spindle brake was found not to need readjustment over a considerable period of operation of the machine; while in conventional equipment of this type the spindle brake would require re-setting at intervals of approximately 3 months.
  • the apparatus allows for considerable flexibility in the manner in which it may be used, while still being capable of giving the benefits occurring rom the use of the present invention.
  • the spindle speed programme embodied in the cam may be modified by incorporation of a rotary potentiometer arranged cyclically to vary the spindle speed throughout the winding opertion, so that the manner or" lay of the filament onto the package is scrambled.
  • the winding apparatus described above is simple in form and is self-correcting for variations in the loading of the apparatus.
  • a method of winding a yarn package on over-end winding apparatus in a manner to minimize slow-down breakages and loops comprising the steps of:
  • a method of winding a yarn package on over-end winding apparatus including draw rolls and a spindle in a manner to minimize defects due to start-up and slowdown, comprising the steps of:
  • a method of winding 2. yarn package according to claim 3 in which the predetermined programme for the spindle drive includes a cyclical variation of the spindle speed.
  • Over-end winding apparatus of the kind in which yarn is fed to a rotating spindle from processing rolls, said apparatus including:
  • Over-end winding apparatus including a zero speed sensing device adapted to receive electrical signals from said second tacho-generator and to activate said servo device to stop the spindle drive on sensing zero speed.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Spinning Or Twisting Of Yarns (AREA)
  • Winding Filamentary Materials (AREA)
US581864A 1965-10-01 1966-09-26 Collection of synthetic polymeric yarns or filaments Expired - Lifetime US3358433A (en)

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GB41758/65A GB1136726A (en) 1965-10-01 1965-10-01 Improvements in or relating to the collection of synthetic polymeric yarns or filaments

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Cited By (8)

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US3445999A (en) * 1966-03-18 1969-05-27 American Enka Corp Method and apparatus for producing yarn packages with a variable speed spindle
US3450371A (en) * 1966-07-04 1969-06-17 Ici Ltd Polyamide yarn packages with tapered end-portions and their production
US3469418A (en) * 1966-12-29 1969-09-30 Gardinen U Dekowerke Zwickau V Apparatus for the regulation of knitting machines
US3477221A (en) * 1966-04-14 1969-11-11 Glanzstoff Ag Process for improving the uniformity of the modulus of elasticity in a draw twist wound thread cop
US3521441A (en) * 1967-06-05 1970-07-21 Rieter Ag Maschf Process and apparatus for reducing yarn waste in draw-twisters
US3546873A (en) * 1968-04-05 1970-12-15 Plasticisers Ltd Machines for producing synthetic yarn
US3589120A (en) * 1968-11-29 1971-06-29 Ici Ltd Process for winding polyamide yarn packages with tapered end-portions
US3638414A (en) * 1969-11-07 1972-02-01 Fiber Industries Inc Programmed spindle speed

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US3009308A (en) * 1960-03-10 1961-11-21 Chemstrand Corp Drawtwisting machinery
GB946240A (en) * 1960-06-01 1964-01-08 Tmm Research Ltd Improvements in speed frames and like textile machines
US3137987A (en) * 1962-07-18 1964-06-23 Monsanto Co Method and apparatus for drawtwisting yarn
US3277641A (en) * 1961-09-28 1966-10-11 Ici Ltd Drawing of synthetic filaments
US3316699A (en) * 1963-10-16 1967-05-02 Klinger Mfg Co Ltd Apparatus for twisting yarn
US3325985A (en) * 1963-01-30 1967-06-20 Zinser Textilmaschinen Gmbh Draw-twisting method and yarn tension adjusting apparatus

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US2682144A (en) * 1947-03-18 1954-06-29 Deering Milliken Res Trust Control method and means
US3009308A (en) * 1960-03-10 1961-11-21 Chemstrand Corp Drawtwisting machinery
GB946240A (en) * 1960-06-01 1964-01-08 Tmm Research Ltd Improvements in speed frames and like textile machines
US3277641A (en) * 1961-09-28 1966-10-11 Ici Ltd Drawing of synthetic filaments
US3137987A (en) * 1962-07-18 1964-06-23 Monsanto Co Method and apparatus for drawtwisting yarn
US3325985A (en) * 1963-01-30 1967-06-20 Zinser Textilmaschinen Gmbh Draw-twisting method and yarn tension adjusting apparatus
US3316699A (en) * 1963-10-16 1967-05-02 Klinger Mfg Co Ltd Apparatus for twisting yarn

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3445999A (en) * 1966-03-18 1969-05-27 American Enka Corp Method and apparatus for producing yarn packages with a variable speed spindle
US3477221A (en) * 1966-04-14 1969-11-11 Glanzstoff Ag Process for improving the uniformity of the modulus of elasticity in a draw twist wound thread cop
US3450371A (en) * 1966-07-04 1969-06-17 Ici Ltd Polyamide yarn packages with tapered end-portions and their production
US3469418A (en) * 1966-12-29 1969-09-30 Gardinen U Dekowerke Zwickau V Apparatus for the regulation of knitting machines
US3521441A (en) * 1967-06-05 1970-07-21 Rieter Ag Maschf Process and apparatus for reducing yarn waste in draw-twisters
US3546873A (en) * 1968-04-05 1970-12-15 Plasticisers Ltd Machines for producing synthetic yarn
US3589120A (en) * 1968-11-29 1971-06-29 Ici Ltd Process for winding polyamide yarn packages with tapered end-portions
US3638414A (en) * 1969-11-07 1972-02-01 Fiber Industries Inc Programmed spindle speed

Also Published As

Publication number Publication date
NL6613793A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1967-04-03
GB1136727A (en) 1968-12-18
GB1136726A (en) 1968-12-18
DE1560230A1 (de) 1970-08-06
BE687661A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1967-03-30
CH481003A (de) 1969-11-15
LU52080A1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1966-11-30

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