EP0118173B1 - Process for crosswinding filamentary yarn - Google Patents

Process for crosswinding filamentary yarn Download PDF

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Publication number
EP0118173B1
EP0118173B1 EP84300325A EP84300325A EP0118173B1 EP 0118173 B1 EP0118173 B1 EP 0118173B1 EP 84300325 A EP84300325 A EP 84300325A EP 84300325 A EP84300325 A EP 84300325A EP 0118173 B1 EP0118173 B1 EP 0118173B1
Authority
EP
European Patent Office
Prior art keywords
yarn
package
traverse
packages
winding
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.)
Expired
Application number
EP84300325A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0118173A1 (en
Inventor
John T. Gunn
James Michael Pierce
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.)
Celanese Corp
Original Assignee
Celanese Corp
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 Celanese Corp filed Critical Celanese Corp
Publication of EP0118173A1 publication Critical patent/EP0118173A1/en
Application granted granted Critical
Publication of EP0118173B1 publication Critical patent/EP0118173B1/en
Expired legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H54/00—Winding, coiling, or depositing filamentary material
    • B65H54/02—Winding and traversing material on to reels, bobbins, tubes, or like package cores or formers
    • B65H54/28—Traversing devices; Package-shaping arrangements
    • B65H54/2884—Microprocessor-controlled traversing devices in so far the control is not special to one of the traversing devices of groups B65H54/2803 - B65H54/325 or group B65H54/38
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H54/00—Winding, coiling, or depositing filamentary material
    • B65H54/02—Winding and traversing material on to reels, bobbins, tubes, or like package cores or formers
    • B65H54/38—Arrangements for preventing ribbon winding ; Arrangements for preventing irregular edge forming, e.g. edge raising or yarn falling from the edge
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2701/00—Handled material; Storage means
    • B65H2701/30—Handled filamentary material
    • B65H2701/31—Textiles threads or artificial strands of filaments
    • B65H2701/313—Synthetic polymer threads
    • B65H2701/3132—Synthetic polymer threads extruded from spinnerets

Definitions

  • This invention relates generally to high speed winding of yarn packages comprising melt-spun yarns crosswound around supporting tubes, by the type of winding machine which uses a so-called grooved roll to traverse the yarn as the yarn is wound around the package. More particularly, it relates to improved and versatile apparatus and process for winding yarns comprising filaments by winding machines of the type in which an inverter is used to control the rotational speed of the grooved roll. It also relates to the improved large yarn packages thereby obtained, which improved packages have less tendency to result in yarn breaks during subsequent yarn unwinding and processing operations.
  • Textured filamentary yarn is conventionally manufactured by false twist texturing so-called partially oriented yarn (POY).
  • POY feedstock package typically consists of continuous filament POY crosswound around an inner supporting tube.
  • the continuous filaments frequently have noncircular cross-section, rather than round cross-section, and a wide range of deniers and filament counts and spin finishes, for reasons that are well known in the art.
  • yarn breakage during the texturing operation results in economic loss for obvious reasons.
  • yarn breakage is most often associated with so-called "bad package build" of the packages most prone to yarn breakage.
  • yarn packages which contain "ribboning" tend to have bad package build for unwinding purposes.
  • Percent Banding Level is the term used in the trade to denote the percentage of all feedstock packages which have a threadline break due to "ribboned" yarn which has slipped into a position of lower helix angle, and is detected during the falsetwist texturing operation.
  • the yarn on a package is said to "ribbon” whenever a helix of yarn is in direct side-by-side contact with the helix of yarn in the immediately preceding yarn layer, for the obvious reason that such a package gives the visual impression that a broad ribbon of yarn has been wound therearound.
  • Ribboning has been found to be a major indirect cause of yarn breakage in unwinding feedstock packages of POY consisting of polyester filaments with slick spin finish thereon, particularly when such packages have been wound by a yarn winder that uses a grooved roll to traverse the yarn as the yarn is wound around the package. Ribboning problems also increase as yarn denier increases.
  • One such winder that uses a grooved traverse roll is the well known commercially used Barmag SW 46SSD Winder, described hereinafter in Example 1.
  • ribboning occurs in a yarn wind-up system at critical package diameters.
  • a critical package diameter occurs whenever there is a ratio of simple integers between the bobbin speed in revolutions per minute and the traverse guide frequency in cycles per minute.
  • the calculation of ribbon zones is easily made under these assumptions and their location for the SW 46SSD winder is presented in one of the Figures. Under these circumstances the helical path of the yarn of the bobbin is exactly repeated.
  • the build-up becomes unstable. This, in turn, frequently leading to difficulties in unwinding large packages during subsequent processing.
  • the traverse frequency is made to oscillate between an upper and a lower limit.
  • the ultimate aim of this oscillation is to avoid a constant speed operation of the traverse, thereby minimizing conditions favorable for ribbon formation.
  • US Patent 3 799 463 discloses a process for winding yarn into a cylindrical-bodied substantially flat-ended package by traverse winding layers of helical coils of yarn on a surface-driven package is improved by not only breaking ribbon formation by the known waveform (minor modulation of inverter output to the traverse motor) from a preset point, but also modulating the set point to create a major modulation having a minor modulation superimposed along or within the modulated set point waveform.
  • the major modulation has a period of about 0.25 to 2 minutes and an amplitude of about 2 to 12 percent.
  • US Patents 3 638 872 and 3 241 779 are also addressed to ribbon-breaking techniques.
  • ribbon-breaking is often accomplished by varying the traverse inverter output frequency (generally ⁇ 1-2.5%) around a specified base frequency over a specified time period (1-8 sec).
  • the inverter output frequency and resulting traverse speed will both produce a sinusoidal wave.
  • the addition of the grooved roll to the traverse system substantially increases the total mass of this system. The increase in mass increases the rotational inertia of the traverse mechanism, making it more resistant to speed changes as directed by a sinusoidal inverter output signal.
  • P-jump an "inertia compensation” or so-called “P-jump” potential is commercially supplied by Barmag with the traverse inverter.
  • the P-jump is an instantaneous change in inverter frequency at the reversal points of maximum and minimum frequency. This instantaneous change in frequency results in a more rapid speed change of the traverse, and helps to compensate for the rotational inertia of the traverse system.
  • P-jump is specified in terms of a percentage of the total traverse amplitude with maximum to minimum frequency being 100%.
  • this technique imposes excessive strain on the inverter, particularly as period of modulation is decreased and P-jump and amplitude of modulation are increased. Even so, trial and error techniques permit selection of traverse setup factors which will reduce constant speed grooved roll operation for a limited variety of roll speeds, modulations, base frequencies, periods and P-jumps.
  • US-A-3799463 discloses a method of breaking ribbon formation in cylindrical yarn packages with helical winding; the method uses a combination of a minor modulation of inverter output to a traverse motor and a major modulation of the set point (see Figure 4 of USA-3799463).
  • the process of US-A-3799463 gives an improvement over the prior art (minor modulation of inverter output) but because it uses a regular major modulation of the set point there will inevitably be some instances of ribbon zones being formed particularly at larger package diameters.
  • US-A-4146376 The teaching of US-A-4146376 is simply that a microcomputer may be used to control the speed of a winder and although it may appear obvious to use a microcomputer to control a traverse mechanism, it teaches nothing about how the traverse mechanism should be regulated.
  • the present invention we provide a process for forming packages of direct-spun yarn by spinning continuous filaments and crosswinding the spun filamentary yarn onto tubes at speeds in excess of 10,000 ft/min (3048 m/min) by traversing the yarn as it is pulled onto the pre-existing portion of the package, and by controlling the frequency of the traverse cycle by means of a static inverter fed by a compatible electrical signal comprising a frequency which varies in accordance with the sum of a long term modulation function and of a short term continuous modulation function, characterised in that said controlling is also performed by programming a digital micro-computer system with a predetermined program which consists of said functions, the long term modulation or varying ramp function corresponding to an average peripheral overfeed of the grooved roll of the traverse mechanism with regard to the peripheral feed of the package in formation, said overfeed being decreased during the package build, said electrical signal being fed from the microcomputer system to the inverter.
  • the means for feeding an electrical output signal from the microcomputer to the inverter may comprise a digital-to-analog converter.
  • This converter may comprise means for converting a 12 bit digital input value into an analog output voltage.
  • the microcomputer comprises a programme comprising a variable ramp function, at least one variable time delay and a modulation function with variable parameter.
  • the minimum value of the variable ramp function is preferably less than 0.94 of the maximum value of the variable ramp function, more preferably less than 0.89 and most preferably less than 0.84.
  • varying ramp function we mean a long term function corresponding to an average peripheral overfeed of the grooved roll of the traverse mechanism with regard to the peripheral speed of the package. information, said overfeed decreasing during the package build.
  • “By modulation function” we mean a short term function which provides a continuous wave modulation above and below the ramp overfeed.
  • the process may comprise varying the frequency of the electrical signal to the inverter in accordance with the sum of a varying ramp function and a modulation function. It may comprise feeding a varying ramp function which essentially decreases during at least most of the winding of the package by an amount that is at least 6 percent of the value of the ramp function used for winding the inner layers of yarn.
  • the ramp function may be modulated in an amount of 1 to 3 percent at a frequency within the range 1 to 20 seconds. At least 20 traverse mechanisms may be controlled with a single common inverter, the ramp function being increased during the winding of the outermost portion of the packages and the full packages being team doffed during the period of increasing ramp function.
  • Crosswound packages of octolobal polyester POY were made according to the improved process described below.
  • the banding level (defined below) of these packages was generally less than 1 percent, in contrast to corresponding prior art packages having a banding level of at least about 3 percent.
  • Figure 1 is a partial semi-schematic view in side elevation of a single position (or unit) for melt-spinning polyester multifilament yarn, and continuously winding the melt-spun yarn in the form of crosswound packages by means of a yarn winder having a grooved roll to traverse the yarn as it is wound into package form.
  • Molten poly(ethylene terephthalate) polymer was conventionally formed into noncircular octolobal filaments (1) by extruding the molten polymer through 33 holes of a spinneret in a conventional melt-spinning head (2).
  • the extruded filaments were conventionally quenched with cooling air by quenching means, had spin finish applied to them by conventional finish applicator (3), air interlaced conventionally by interlacer (21) and wound into package form at about 11,500 ft/min (3505 m/min) by means of an otherwise conventional Barmag Model SW 46SSD Class II Winder except for the microcomputer programmed traverse speed of the invention.
  • the fully wound packages (17) had diameters within the range 300-350 mm and lengths of about 250 mm, in general accordance with package dimensional pictures and data in Barmag literature on the forementioned Barmag winder page 12 line 27.
  • Barmag Winders are well known in the art and fully described in Barmag's trade literature such as "SW4S; SW46S", obtainable from American Barmag Corporation, 1101 Westinghouse Boulevard, Charlotte, NC 28217, some description of the machine and its characteristics is given below.
  • FIG. 1 illustrates the relative location of the winder's drive roll (6) chuck (7) and traverse system including two yarn-contacting components, a grooved roll (8) and traverse guide (9).
  • the drive roll and traverse mechanism of the winder are built into a joint housing (not shown) and fastened to a vertically movable slide (not shown). Contact is made between the chuck and take-up head by lowering the drive roll/traverse assembly onto the chuck.
  • the drive roll/traverse assembly is pneumatically weight balanced by means of opposing low friction cylinders (not shown). While the POY package is building, constant pressure is exerted by the drive roll on the yarn package.
  • the drive roll has a ground, hard, chromeplated, polished surface and is driven by a synchronous motor mounted inside the roll.
  • the threadline is in the traverse guide (9) throughout the entire stroke, and the guide is moved back and forth by a traverse cam (10).
  • a grooved roll (8) is arranged below the traverse cam.
  • the threadline wraps around the groove of the grooved roll with an approximately 90° wrap, and is subsequently placed on the package with a very small reversing radius.
  • the whole traverse system is driven by a three phase induction motor (not shown) mounted inside the grooved roll.
  • the traverse cam is driven by the grooved roll motor via a gear belt (11).
  • the chuck (7) supplied with the winder is a manual type with spring loaded fingers (not shown) holding the cardboard tube (12) in place during operation.
  • the shape of the package is that of a true cylinder.
  • the yarn is printed onto the package surface at absolutely constant helix angle, along the length of the package.
  • the linear surface speed of the package is identical to the linear surface speed of the drive roll (DRS).
  • the system provides a so-called absolutely constant yarn "% overfeed", defined as follows in terms of grooved roll speed (GRS) and drive roll speed (DRS):
  • D PN equals 270.0 mm when: N is 4; D GR is 108 mm; R GR is 11; and F is 10. This is shown on Figure 5 as point "A".
  • Table 1 summarizes some data obtained in practising variants of the invention. It shows the "banding level” significantly depends upon yarn properties as well as the specific overfeed program that is used to control the actual rotational speed of the grooved roll throughout the package build. "Banding level” is the number of packages with unacceptable “bands” therein, expressed as a percentage. The bands result from slippage of "patterned or ribboned" yarn into a position of reduced helix angle.
  • the overfeed/time relationships that were used are shown in Figures 4A-4C. They were obtained by means of a separate inverter (shown as 13 in Figures 1 and 2) for each winder, with each of these inverters being controlled by a microcomputer (shown as 14 in Figures 1 and 2).
  • the individual inverters drove the traverse motors (not shown) on the winders.
  • the microcomputer consisted of a commercially available Intel SBC 80/20-4 single board Digital microcomputer connected with a commercially available Adac 735-SBC Digital-to-Analog Converter Board, whose output was fed to the static inverter.
  • the inverter was a commercially available 3 horse power static inverter manufactured by PTI Controls, Inc.
  • the Digital output signal from the microcomputer was used to control the frequency of the output signal from the static inverter to the traverse motor.
  • a cathode ray tube (15 of Figure 1) was used to examine and change various parameters associated with the traverse speed control program.
  • the microcomputer program consisted of two speed control functions: firstly, a long term "ramp” function which controlled the average percent overfeed, F, and secondly, a short term “modulation” function which provided continuous wave modulation above and below the ramp overfeed.
  • the amplitude and period and shape of the combined wave were varied by the microcomputer, and the CRT was used to set the parameters, by techniques that would be well known to one of average skill in the art. Results were obtained as in Table 1.
  • Crosswound packages of octolobal polyester POY were made with commercially available Barmag Winders in general accordance with Example 1, but without using the microcomputer programmed traverse speed of the invention.
  • "modulated constant ramp" traverse speeds were selected from those available on commercially available Barmag equipment prior to the introduction of RFR in 1982.
  • Table 2 summarizes the % banding levels obtained for various yarns under various winding conditions. In general, it appeared that these packages tended to be more saddle-shaped than those of Example 1.
  • Figure 4D is a graphical representation of the microcomputer controlled overfeed of the 80 Barmag winders that were used in tandem.
  • Example 3A and 3B the yarn was conventionally air interlaced between the finish applicator and the winder.

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  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Textile Engineering (AREA)
  • Winding Filamentary Materials (AREA)
EP84300325A 1983-02-03 1984-01-19 Process for crosswinding filamentary yarn Expired EP0118173B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US46343983A 1983-02-03 1983-02-03
US463439 1983-02-03

Publications (2)

Publication Number Publication Date
EP0118173A1 EP0118173A1 (en) 1984-09-12
EP0118173B1 true EP0118173B1 (en) 1988-03-09

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ID=23840086

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84300325A Expired EP0118173B1 (en) 1983-02-03 1984-01-19 Process for crosswinding filamentary yarn

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EP (1) EP0118173B1 (pt)
DE (1) DE3469717D1 (pt)
PT (1) PT78050B (pt)
ZA (1) ZA84553B (pt)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3401530A1 (de) * 1984-01-18 1985-07-25 Fritjof Dipl.-Ing. Dr.-Ing. 6233 Kelkheim Maag Praezisionsspule, sowie verfahren und vorrichtung zu deren herstellung
DE3562216D1 (en) * 1984-08-18 1988-05-26 Barmag Barmer Maschf Cylindrical cross-wound bobbin
IT1251866B (it) * 1991-09-24 1995-05-26 Fadis Spa Metodo per il controllo della posizione del punto di inversione del filato particolarmente per macchine roccatrici e relativa apparecchiatura

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3638872A (en) * 1968-03-28 1972-02-01 Du Pont Process for winding a yarn package
NL7511525A (nl) * 1974-10-03 1976-04-06 Joy Mfg Co Wikkelstuurstelsel.
US4146376A (en) * 1977-12-30 1979-03-27 Owens-Corning Fiberglas Corporation Microcomputer controlled winder
US4269368A (en) * 1978-11-07 1981-05-26 Owens-Corning Fiberglas Corporation Microprocessor controlled product roving system
US4377263A (en) * 1981-06-18 1983-03-22 Monsanto Company Ribbon breaking method and apparatus

Also Published As

Publication number Publication date
PT78050B (en) 1986-06-09
PT78050A (en) 1984-03-01
DE3469717D1 (en) 1988-04-14
ZA84553B (en) 1984-12-24
EP0118173A1 (en) 1984-09-12

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