US2847704A - Method and apparatus for cooling melt spun threads - Google Patents

Method and apparatus for cooling melt spun threads Download PDF

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Publication number
US2847704A
US2847704A US381706A US38170653A US2847704A US 2847704 A US2847704 A US 2847704A US 381706 A US381706 A US 381706A US 38170653 A US38170653 A US 38170653A US 2847704 A US2847704 A US 2847704A
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United States
Prior art keywords
chamber
air
thread
spinning
area
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Expired - Lifetime
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US381706A
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English (en)
Inventor
Scheers Hermanus Jos Hendrikus
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Akzona Inc
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American Enka Corp
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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
    • D01D5/00—Formation of filaments, threads, or the like
    • D01D5/08—Melt spinning methods
    • 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
    • D01D5/00—Formation of filaments, threads, or the like
    • D01D5/08—Melt spinning methods
    • D01D5/088—Cooling filaments, threads or the like, leaving the spinnerettes
    • D01D5/092—Cooling filaments, threads or the like, leaving the spinnerettes in shafts or chimneys

Definitions

  • the method of the present invention is characterized by an automatic thermosyphon ventilation of the spinning cell which is brought about by perforating a portion of the cell Wall and using the heat of the freshly spun thread as the primary power supply to circulate the cooling air.
  • the melt is extruded through a spinneret 4 from a conventional melt supply container 3.
  • the spinneret 4 is arranged to extrude vertically downwardly such molten organic compounds as caprolactam polyamides or various other thermoplastic compounds such as polyvinyl deriva tives, polyacrylic acid derivatives, polyesters, polyethers and polyamides.
  • the method and apparatus of the present invention is quite suitable for use with compounds such as polyvinyl esters, polyvinyl chloride, polystyrene, polyacetals, and polyethyleneterephthalates.
  • the molten plastic thread 8 is allowed to solidify by cooling within a cylindrical chamber 1, which co-axially surrounds the spinneret 4 and depends vertically from the melt supply container 3 which, with the spinneret, closesthe top of the chamber.
  • a heat insulating collar 2 surrounds the upper end of the chamber 1 adjacent to the spinneret. From the bottom ofjhis collar for a vertical distance. .h thetubular chamber ⁇ is unperforated. Then for a vertical distance k it is perforated -and, belowtheperforatedarea, it is ;again unper forated.
  • the bottom of the tubular chamber 1 is open to atmosphere and the bundle offilarnents which constitutes the thread 8 passes axially through the entire length of the chamber 1 andissues from its open mouth at the bottom.
  • the tubular chamber 1 is .coaxially surrounded by a large tube 9 which overlaps the perforated arca e, and extends axially at least into the unperforated area or zon elS, although the samemay also, extend axially below thearea 6 in the manner shown in the. drawing".
  • the large tube 9 is openat both ends, and its v lower end .11 is surrounded bya protective sleeve 12, which is, a its lower end, sealed to the chamber 1 by an annular disl. i3. It is .now evident that air surrounding the thread 8 will beheated by. direct contact with the thread. The heating of theairin the chamber 1 will cause it to flow upwardly in the direction of the arrows.
  • the heated air When it reaches the perforated zone 6 of the tube 1, the heated air will pass throughthe perforations and induce a flow in the annular space 14 between the tubel and the tube 9. Cooling air will enter the space 14 from the bottom through the open top 15 of the sleeve 12 as indicated by the arrows.
  • the length of the chamber 1 may be only from eighty to. one .hundred centimeters.
  • the chamber 1 must *be much longer in order to coolthe larger quantity of ,faster movingthread,
  • the chamber may be as long as fromtwo to four meters.
  • the unperforated area 5 of the chamber 1 is at least ten centimeters is length for low denier threads, and, for threads of higher denier, it may be as great asthirty centimeters.
  • the perforations may extend forthe full length below the zone 5, but, for a long chamber, the perforated zone should be at least one hundred centimeters in length.
  • the perforations must be symmetrically distributed around the circumference of the chamber 1, throughout the entire axial length of the perforate zone. Holes of from one to five millimeters in diameter have given satisfaction. Too large holes may bring about discrepancies in the air flow and too small ones may offer excessive resistance to flow and may be closed by condensation of by-products of the thread.
  • the perforations of the spinning chamber wall decreasing from top to bottom. This may be attained by decreasing the diameter of the holes from top to bottom with constant number of holes per unit surface, or by decreasing the number of holes per unit surface with constant diameter of holes.
  • the perforation may have any shape, e. g. a slit shape, provided the passage and the resistance of the individual holes are not too great, and the holes give no rise to clogging.
  • the absolute measure of perforations e. g. expressed as the ratio total hole surface to perforated surface of the spinning chamber. It should be determined for every case. This ratio depends, among other things, upon the denier of the thread to be spun, upon the speed at which the thread is to be spun and uponthe amount of heat brought into the spinning chamber by the spinning mass from the spinneret per unit time.
  • perforation ratio sum of hole surfaces to perforated surface of the spinning chamber is within the range one to twenty-five percent.
  • a six-filament, one hundred denier caprolactam thread was spun at a drawoif speed of eight hundred meters a minute.
  • the chamber 1 was one hundred thirty centimeters long.
  • the perforations were three millimeters in diameters and the perforation ratio was four percent in the area 6.
  • four percent of the available surface of the tube 1 in the axial length h was perforated.
  • the diameter of the tube 1 may of course vary with the size of the thread being spun.
  • the large tube 9 and sleeve 12 protect the air issuing from the perforations against drafts and promote the regular symmetrical air loss from the tube 1.
  • a spinning cell comprising means to extrude a molten plastic thread in a path extending downwardly along a vertical axis, a first tubular chamber concentrically surrounding said path, said first chamber having an unperforated area at its upper end and a perforated area adjacent to and immediately below said unperforated area, and a second tubular chamber concentrically surrounding at least a portion of the perforated area in spaced relation to said first chamber and extending axially beyond said perforated area into overlapping relationship with said unperforated area, said second chamber being open at its upper and lower ends.
  • a spinning cell comprising means including a spinneret to extrude a molten plastic thread in a path extending downwardly along a vertical axis, a first tubular chamber concentrically surrounding said path, said first chamber having an unperforated area extending at least 10 cm. downwardly from the upper end thereof and a perforated area adjacent to and immediately below said unperforated area, and a second tubular chamber concentrically surrounding at least a portion of the perforated area in spaced relation to said first chamber and extending axially beyond said perforated area into overlapping relationship with said unperforated area, said second chamber being open at its upper and lower ends.
  • a spinning cell comprising means to extrude a molten plastic thread in a path extending downwardly along a vertical axis, a first tubular chamber concentrically surrounding said path, said first chamber having an unperforated area at its upper end and a perforated area adjacent to and immediately below said unperforated area, a second tubular chamber concentrically surrounding at least a portion of the perforated area in spaced relation to said first chamber and extending axially beyond said perforated area into overlapping relationship with said unperforated area, said second chamber being open at its upper and lower ends, and a protective sleeve concentrically surrounding the lower end of said second chamber in spaced relation thereto, said sleeve being open at its upper end and closed at its lower end.
  • the automatic thermosyphon ventilation process comprising the steps of extruding a molten thermoplastic thread vertically downwardly into contact with a first column of air, causing said first column of air to flow upwardly primarily as a result of the heating thereof upon contact with the freshly extruded thread, and maintaining limited contact between the heated first column of air and a second column of air concentrically disposed thereabout, thereby inducing upward flow only in said second column of air in a zone concentric with but disposed outwardly of said first column of air as a result of the heating thereof upon contact with the heated first column, whereby a uniform flow of ventilating air axially of the extruded thread is accomplished without the use of positive air circulating means.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Spinning Methods And Devices For Manufacturing Artificial Fibers (AREA)
US381706A 1952-11-27 1953-09-22 Method and apparatus for cooling melt spun threads Expired - Lifetime US2847704A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL316364X 1952-11-27

Publications (1)

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US2847704A true US2847704A (en) 1958-08-19

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US381706A Expired - Lifetime US2847704A (en) 1952-11-27 1953-09-22 Method and apparatus for cooling melt spun threads

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US (1) US2847704A (en(2012))
BE (1) BE522399A (en(2012))
CH (1) CH316364A (en(2012))
FR (1) FR1083790A (en(2012))
GB (1) GB738715A (en(2012))
NL (1) NL77336C (en(2012))

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3053611A (en) * 1958-01-21 1962-09-11 Inventa Ag Process for spinning of synthetic fibers
US3070839A (en) * 1958-12-24 1963-01-01 Du Pont Controlled quenching apparatus
US3083405A (en) * 1958-10-03 1963-04-02 Heinz Erich Sommer Process and apparatus for the manufacture of fibres from fusible mineral materials, more particularly glass and its derivatives
US3257487A (en) * 1963-03-04 1966-06-21 Allied Chem Melt spinning of epsilon-polycaproamide filament
US3361859A (en) * 1960-04-29 1968-01-02 Du Pont Melt-spinning process
US3969462A (en) * 1971-07-06 1976-07-13 Fiber Industries, Inc. Polyester yarn production
US5141700A (en) * 1986-04-30 1992-08-25 E. I. Du Pont De Nemours And Company Melt spinning process for polyamide industrial filaments
US20030188556A1 (en) * 2002-04-08 2003-10-09 Alcatel Optical fiber cooling tube

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1861912A (en) * 1928-03-22 1932-06-07 Aceta Gmbh Apparatus for heating air in dry spinning of artificial threads
US1959414A (en) * 1929-11-14 1934-05-22 Celanese Corp Apparatus for making yarns
US2252684A (en) * 1938-08-09 1941-08-19 Du Pont Apparatus for the production of artificial structures
GB565282A (en) * 1943-03-10 1944-11-03 British Nylon Spinners Ltd Improvements in or relating to the manufacture of artificial threads

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1861912A (en) * 1928-03-22 1932-06-07 Aceta Gmbh Apparatus for heating air in dry spinning of artificial threads
US1959414A (en) * 1929-11-14 1934-05-22 Celanese Corp Apparatus for making yarns
US2252684A (en) * 1938-08-09 1941-08-19 Du Pont Apparatus for the production of artificial structures
GB565282A (en) * 1943-03-10 1944-11-03 British Nylon Spinners Ltd Improvements in or relating to the manufacture of artificial threads

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3053611A (en) * 1958-01-21 1962-09-11 Inventa Ag Process for spinning of synthetic fibers
US3083405A (en) * 1958-10-03 1963-04-02 Heinz Erich Sommer Process and apparatus for the manufacture of fibres from fusible mineral materials, more particularly glass and its derivatives
US3070839A (en) * 1958-12-24 1963-01-01 Du Pont Controlled quenching apparatus
US3361859A (en) * 1960-04-29 1968-01-02 Du Pont Melt-spinning process
US3257487A (en) * 1963-03-04 1966-06-21 Allied Chem Melt spinning of epsilon-polycaproamide filament
US3969462A (en) * 1971-07-06 1976-07-13 Fiber Industries, Inc. Polyester yarn production
US5141700A (en) * 1986-04-30 1992-08-25 E. I. Du Pont De Nemours And Company Melt spinning process for polyamide industrial filaments
US20030188556A1 (en) * 2002-04-08 2003-10-09 Alcatel Optical fiber cooling tube
US7153115B2 (en) * 2002-04-08 2006-12-26 Alcatel Optical fiber cooling tube

Also Published As

Publication number Publication date
NL77336C (en(2012))
CH316364A (de) 1956-10-15
GB738715A (en) 1955-10-19
BE522399A (en(2012))
FR1083790A (fr) 1955-01-12

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