US3475523A - Monitored melt spinning method and apparatus - Google Patents

Monitored melt spinning method and apparatus Download PDF

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Publication number
US3475523A
US3475523A US489668A US48966865A US3475523A US 3475523 A US3475523 A US 3475523A US 489668 A US489668 A US 489668A US 48966865 A US48966865 A US 48966865A US 3475523 A US3475523 A US 3475523A
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US
United States
Prior art keywords
pump
meter
spinning
motor
polymer
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 - Lifetime
Application number
US489668A
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English (en)
Inventor
James R Nicholson
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.)
Monsanto Co
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Monsanto Co
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 Monsanto Co filed Critical Monsanto Co
Priority to US489668A priority Critical patent/US3475523A/en
Priority to GB40716/66A priority patent/GB1106834A/en
Priority to LU51953D priority patent/LU51953A1/xx
Priority to IL26516A priority patent/IL26516A/xx
Priority to NL6613186A priority patent/NL6613186A/xx
Priority to JP41062367A priority patent/JPS5231449B1/ja
Priority to FR77322A priority patent/FR1500359A/fr
Priority to DE1660485A priority patent/DE1660485C3/de
Priority to CH1372766A priority patent/CH460240A/fr
Priority to BE687314D priority patent/BE687314A/xx
Application granted granted Critical
Publication of US3475523A publication Critical patent/US3475523A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
    • D01D1/00—Treatment of filament-forming or like material
    • D01D1/06—Feeding liquid to the spinning head
    • D01D1/09—Control of pressure, temperature or feeding rate

Definitions

  • I NVEN TOR JAMES R. NICHOLSON j/fl i.
  • the primary object of the invention is to provide a method and apparatus for reliably and accurately detecting certain abnormal spinning conditions.
  • a further object is to provide a method and apparatus of the above character wherein the detection is accomplished by monitoring the power consumed by the pump motors.
  • FIGURE 1 is a schematic vertical sectional view of an exemplary melt spinning apparatus according to the present invention.
  • FIGURES 2 and 3 are graphs of pack pressure versus meter pump motor power requirement, and pack pressure versus spun denier, respectively, for a particular spinning apparatus.
  • FIGURE 1 illustrates a generalized melt spinning apparatus wherein polymer flake is introduced into an aperture in the top of a heated block assembly 22. The flake is melted by heated fins 24 and falls as molten polymer into melt pool 26 beneath fins 24.
  • Booster pump 28' is driven by alternating current motor 30, which may be of induction type, and is submerged in melt pool 26 and supplies molten polymer to distribution passage 32.
  • Close- .tolerance meter pump 34 driven by synchronous motor 36, has its inlet passage connected to receive the polymer in passage 32, and pumps a metered output stream into 3,475,523 Patented Oct. 28, 1969 chamber 38 for extrusion through spinneret 40.
  • the molten polymer extruded through spinneret 40 is illustrated as forming a plurality of filaments 42 which are solidified or cooled by conventional means (not illustrated) and gathered into yarn 44.
  • a filter or spinning pack 46 is mounted in chamber 38 above spinneret 40 to remove gel particles and the like from the molten polymer. Filter 46 also imparts desirable shear to the polymer just prior to extrusion, as is well known in the art. Filter 46 may be composed of layers of various grades of sand, stacked screens, sintered porous structures, or the like.
  • Synchronous motor 36 may be any of the conventional synchronous motor constructions. Thus it may have a permanent-magnet rotor, a D.C.-excited rotor, or the motor may be of reluctance synchronous design. Whatever the type synchronous motor selected, means 48 (illustrated as a wattmeter) are provided for detecting the power consumed by motor 36.
  • FIGURE 2 illustrates the power consumed by such a synchronous motor as a function of the pressure developed in chamber 38, for an exemplary embodiment of the invention.
  • motor 36 consumed about 15 watts with filter 46 and spinneret 40 removed, and there is a substantially linear relationship between power consumed and the pressure in chamber 38 (pack pressure), so long as the pressure in passage 32 is reasonably constant. In normal operation, the pressure in passage 32 will be reasonably constant.
  • FIGURE 3 illustrates the relationship between spun denier and pack pressure, for an exemplary yarn count.
  • the horizontal dotted lines indicate acceptable denier quality control limits. Therefore, for this particular yarn count the minimum spinning pressure is around 1700 p.s.i. (pounds per square inch) and the maximum spinning pressure is near 5800 p.s.i., corresponding to meter pump wattages of about 30 and respectively.
  • a simple alarm or light 49 may be activated whenever the meter pump wattage varies outside the predetermined limits of normal operation, thus detecting defective yarn as soon as it is spun without the necessity of visual monitoring of the meter.
  • booster pump 28 supplies more polymer to distribution passage 32 than is pumped by metering pump 34.
  • booster pump 28 has a relief orifice on its output side, to discharge the excess polymer back to melt pool 26. On occasion this relief orifice becomes plugged and causes a sharp increase in pressure in passage 32. This reduces the pressure difference across meter pump 34 and causes an increase in spun denier.
  • booster pump 32 suffers a loss of polymer supply due to a temporary lowering of the melt rate, the pressure in distribution passage 32 drops or becomes variable. This condition will result in production of low or variable denier yarn. Either of these conditions (plugging of the relief orifice or loss of polymer supply) causes substantial variations in the power consumed by booster motor 30.
  • relay contacts may be added to meter 50, in order to actuate a light or alarm 52 when the power consumed by motor 30 varies outside a pre-determined range. Alarms 49 and 52 can be combined, if desired.
  • a comparison of the readings of wattmeters 48 and 50 can usually identify the type of abnormal condition. Thus if meter 50 maintains its normal reading while meter 48 indicates an abnormally high reading, the defective condition is an abnormal increase in the resistance of filter 46. If, on the other hand meter 50 reads an abnormally low wattage while meter 48 indicates a normal or low wattage, the failure is a loss of polymer supply to the booster pump 28. Othere defective conditions are similarly indicated by other comparisons of meter readings.
  • the power measuring means 48 and 50 need not necessarily include a conventional meter as such, but could include other means responsive to the levels of power consumed by motors 30 and 36.
  • Monitoring the power of the meter pump motor according to the invention is not restricted to metering pump supplied from melted polymer flake, but may be applied to metering pumps fed directly from a polymerizer. In any case where a plurality of spinning positions are to be monitored, it may be desirable to provide a scanning mechanism whereby a single power-measuring means is connected, as by a stepping switch, to sequentially measure the power consumed in several motors. Provision of a suitable scanning mechanism is well within the scope of one skilled in the art.
  • the invention has proved to be of substantial economic significance.
  • application of the invention permitted the reduction of low denier yarn by 62%, reduction of pack leaks by 56%, and provided a significant improvement in overall denier uniformity.
  • the invention as above disclosed provides a substantial improvement in the art of spinning of artificial fibers.
  • the apparatus necessary for practice of the invention is simple and reliable, and provides economic advantages greatly in excess of the cost of the additional apparatus. If separate power measuring means are provided for the meter pump motor 36 and the booster pump motor 30, the cause of failure of the unit can be determined with considerable assurance before the equipment is disassembled for repair.
  • the power measuring system herein disclosed permits each unit to be operated until the pack pressure actually increases to an unsatisfactory level, rather than disassembling all units after some arbitrary time in service has elapsed.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Spinning Methods And Devices For Manufacturing Artificial Fibers (AREA)
US489668A 1965-09-23 1965-09-23 Monitored melt spinning method and apparatus Expired - Lifetime US3475523A (en)

Priority Applications (10)

Application Number Priority Date Filing Date Title
US489668A US3475523A (en) 1965-09-23 1965-09-23 Monitored melt spinning method and apparatus
GB40716/66A GB1106834A (en) 1965-09-23 1966-09-12 Melt-spinning method and apparatus
LU51953D LU51953A1 (US07655688-20100202-C00010.png) 1965-09-23 1966-09-13
IL26516A IL26516A (en) 1965-09-23 1966-09-14 Melt spinning method and apparatus
NL6613186A NL6613186A (US07655688-20100202-C00010.png) 1965-09-23 1966-09-19
JP41062367A JPS5231449B1 (US07655688-20100202-C00010.png) 1965-09-23 1966-09-22
FR77322A FR1500359A (fr) 1965-09-23 1966-09-22 Procédé et appareil pour le filage à l'état fondu de polymères
DE1660485A DE1660485C3 (de) 1965-09-23 1966-09-23 Vorrichtung zum Schmelzspinnen von synthetischen Fäden
CH1372766A CH460240A (fr) 1965-09-23 1966-09-23 Procédé de filage à l'état fondu d'un polymère synthétique, et appareil pour sa mise en oeuvre
BE687314D BE687314A (US07655688-20100202-C00010.png) 1965-09-23 1966-09-23

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US489668A US3475523A (en) 1965-09-23 1965-09-23 Monitored melt spinning method and apparatus

Publications (1)

Publication Number Publication Date
US3475523A true US3475523A (en) 1969-10-28

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Family Applications (1)

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US489668A Expired - Lifetime US3475523A (en) 1965-09-23 1965-09-23 Monitored melt spinning method and apparatus

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US (1) US3475523A (US07655688-20100202-C00010.png)
JP (1) JPS5231449B1 (US07655688-20100202-C00010.png)
BE (1) BE687314A (US07655688-20100202-C00010.png)
CH (1) CH460240A (US07655688-20100202-C00010.png)
DE (1) DE1660485C3 (US07655688-20100202-C00010.png)
FR (1) FR1500359A (US07655688-20100202-C00010.png)
GB (1) GB1106834A (US07655688-20100202-C00010.png)
IL (1) IL26516A (US07655688-20100202-C00010.png)
LU (1) LU51953A1 (US07655688-20100202-C00010.png)
NL (1) NL6613186A (US07655688-20100202-C00010.png)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3619433A (en) * 1967-05-26 1971-11-09 Du Pont Method for determining filament denier of filaments spun from a spinning pack
WO2006061236A1 (de) * 2004-12-10 2006-06-15 Saurer Gmbh & Co. Kg Vorrichtung zur herstellung, behandlung und weiterverarbeitung von synthetischen fasern
CN102851763A (zh) * 2012-08-09 2013-01-02 广州中国科学院先进技术研究所 一种集成式中空纤维膜纺丝机
CN110938875A (zh) * 2019-12-27 2020-03-31 南通醋酸纤维有限公司 一种纺丝机计量泵传动轴双端驱动装置

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU517825B2 (en) * 1977-04-12 1981-08-27 Union Carbide Corporation Gear pump
DE102005031520A1 (de) * 2005-07-06 2007-01-11 Zimmer Ag Pumpeneinheit zur Förderung von Spinnmasse

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2540146A (en) * 1948-05-27 1951-02-06 Dow Chemical Co Method for controlled blending of polystyrene with modifiers
US2566854A (en) * 1949-01-26 1951-09-04 Us Rubber Co Extrusion control
US3002226A (en) * 1959-06-15 1961-10-03 Owens Corning Fiberglass Corp Method and apparatus for controlling formation of fibers by calorimetry
US3347960A (en) * 1964-05-20 1967-10-17 Du Pont Process and apparatus for controlled preparation of a web
US3391232A (en) * 1964-08-12 1968-07-02 Du Pont Forming process regulation

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2540146A (en) * 1948-05-27 1951-02-06 Dow Chemical Co Method for controlled blending of polystyrene with modifiers
US2566854A (en) * 1949-01-26 1951-09-04 Us Rubber Co Extrusion control
US3002226A (en) * 1959-06-15 1961-10-03 Owens Corning Fiberglass Corp Method and apparatus for controlling formation of fibers by calorimetry
US3347960A (en) * 1964-05-20 1967-10-17 Du Pont Process and apparatus for controlled preparation of a web
US3391232A (en) * 1964-08-12 1968-07-02 Du Pont Forming process regulation

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3619433A (en) * 1967-05-26 1971-11-09 Du Pont Method for determining filament denier of filaments spun from a spinning pack
WO2006061236A1 (de) * 2004-12-10 2006-06-15 Saurer Gmbh & Co. Kg Vorrichtung zur herstellung, behandlung und weiterverarbeitung von synthetischen fasern
CN102851763A (zh) * 2012-08-09 2013-01-02 广州中国科学院先进技术研究所 一种集成式中空纤维膜纺丝机
CN102851763B (zh) * 2012-08-09 2015-10-14 广州中国科学院先进技术研究所 一种集成式中空纤维膜纺丝机
CN110938875A (zh) * 2019-12-27 2020-03-31 南通醋酸纤维有限公司 一种纺丝机计量泵传动轴双端驱动装置

Also Published As

Publication number Publication date
JPS5231449B1 (US07655688-20100202-C00010.png) 1977-08-15
IL26516A (en) 1969-12-31
LU51953A1 (US07655688-20100202-C00010.png) 1967-03-13
DE1660485B2 (de) 1976-08-19
DE1660485C3 (de) 1978-06-01
NL6613186A (US07655688-20100202-C00010.png) 1967-03-28
BE687314A (US07655688-20100202-C00010.png) 1967-03-23
DE1660485A1 (de) 1971-03-18
GB1106834A (en) 1968-03-20
FR1500359A (fr) 1967-11-03
CH460240A (fr) 1968-07-31

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