US3397427A - Sealed vented insert spinneret - Google Patents

Sealed vented insert spinneret Download PDF

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Publication number
US3397427A
US3397427A US582321A US58232166A US3397427A US 3397427 A US3397427 A US 3397427A US 582321 A US582321 A US 582321A US 58232166 A US58232166 A US 58232166A US 3397427 A US3397427 A US 3397427A
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US
United States
Prior art keywords
spinneret
insert
passage
polymer
cylindrical portion
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
US582321A
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English (en)
Inventor
Jr James De Jarnette Burke
Hawkins Curtis Owen
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.)
EIDP Inc
Original Assignee
EI Du Pont de Nemours and 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 EI Du Pont de Nemours and Co filed Critical EI Du Pont de Nemours and Co
Priority to US582321A priority Critical patent/US3397427A/en
Priority to GB43787/67A priority patent/GB1144117A/en
Priority to FR122256A priority patent/FR1540564A/fr
Priority to CH1343667A priority patent/CH454341A/de
Priority to NL6713105A priority patent/NL6713105A/xx
Priority to BE704360D priority patent/BE704360A/xx
Application granted granted Critical
Publication of US3397427A publication Critical patent/US3397427A/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
    • D01D5/00—Formation of filaments, threads, or the like
    • D01D5/24—Formation of filaments, threads, or the like with a hollow structure; Spinnerette packs therefor
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S425/00—Plastic article or earthenware shaping or treating: apparatus
    • Y10S425/217—Spinnerette forming conjugate, composite or hollow filaments

Definitions

  • This invention relates to spinnerets and, more particularly, to a spinneret for the production of hollow filaments from synthetic polymers.
  • spinnerets proposed for the spinning of hollow filaments, and generally these include an insert fitted in the spinneret passage to provide an annular space at the outlet for the formation of the sheath of the hollow filament.
  • the interior of the filament is prevented from collapsing by introducing a gas or drawing air into the center of the filament by means of passageways in the insert.
  • Another object of this invention is to provide an inserttype hollow filament spinneret that has an improved seal between the polymer and core supply fluid passageways.
  • a further objective of this invention is to provide an inserttype hollow filament spinneret wherein visual inspection can be made through the polymer passage without removing the insert.
  • the objects of this invention are accomplished by providing a spinneret formed from a plate.
  • the upper and lower surfaces of the plate are connected by a passage having successive cylindrical, tapered and capillary lengths.
  • An insert is fitted in the passage to form an extrusion orifice at the outlet of the passage.
  • the insert has an upper cylindrical portion coextensive with the cylindrical length of the passage and a lower cylindrical portion projecting from the upper cylindrical portion substantially through the capillary length of the passage.
  • the upper cylindrical portion of the insert has an axial bore partially through it and a plurality of radially spaced holes in communication with the bore and the tapered length of the passage to provide a polymer flow path through the spin- 3,397,427 Patented Aug. 20, 1968 neret.
  • There are communicating passageways through the plate and the insert for supplying fluid to the interior of the hollow filament formed by extruding plastic material through the passage of the spinneret.
  • FIGURE 1 is a section view through a spinneret according to the invention.
  • FIGURE 2 is a section view of the insert of FIGURE 1.
  • FIGURE 3 is a bottom view of the insert of FIGURE 2.
  • FIGURE 4 is an enlarged partial section of FIGURE 1.
  • spinneret 10 is adapted to be mounted in a conventional filter pack for supplying a polymer composition to be spun into a filamenL
  • the spinneret 10 is formed from a plate 11 and is provided with a passage, connecting its upper and lower surfaces, that includes a first cylindrical length 12 terminating at shoulder 14, and a tapered length 16 continuing from shoulder 14 to a capillary length 18.
  • An insert 20 is swaged into this passage and held in position by lip 23 which is formed as the insert is flared into the passage.
  • the insert includes a first cylindrical portion 22 and a second cylindrical portion 24 continuing from the bottom surface 21 of the first cylindrical portion.
  • portion 24 are smaller than the capillary length 18 of the spinneret passage, thus forming a spinning orifice having the desired width of the wall of the filament to be spun.
  • the insert 20 is also provided with a comparatively large central axial bore 26 that extends partially through the insert and terminates in a flat surface 30. Holes 32 lead straight through from flat surface 30 to bottom surface 21 of the insert and are substantially equispaced radially from the axis of bore 26 to provide uniform polymer flow into the continuous passage formed by cylindrical portion 24 of the insert 20 and capillary length 18. It can be readily seen that the alignment of the bore 26, holes 32, tapered length 16 and capillary length 18 of the spinneret passage allows for visual inspection of the polymer passage of the spinneret.
  • the insert 20 is provided with a lower axial bore 28 which connects to a lateral bore 34.
  • the bore 34 is aligned with a lateral bore 36 extending through the spinneret 10.
  • the combined bores 36, 34 and 28 form a continuing passageway for supplying fluid to the interior of the hollow filament.
  • surface 21 of the insert 20 engages shoulder 14 in the bore of the spinneret 10 and the upper surface 25 of insert 20 is engaged by lip 23. In this manner, a positive seal is formed between the insert 20 and the spinneret to prevent leakage of the polymer into the core supply passageways 36, 34 and 28.
  • the molten polymer composition moves initially into bore 26 of insert 20 then it is uniformly distributed through holes 32 and passes through the passageway defined by cylindrical portion 24 of the insert 20 and capillary length 18 to form a hollow filament.
  • a partial vacuum is formed causing a gravity flow of room air through the combined bores 36, 34 and 28 into the center of the filament.
  • the percentage of filament void can be controlled by capillary geometry, polymer viscosity and the rate of spinning and quenching.
  • the holes 32 are shown equispaced radially it is also comprehended that they may also be equispaced both radially and circumferentially.
  • the spinneret .of this invention may be made from metals known in the art, such as stainless-steel or platinum group metals.
  • condensation polymers and copolymers for example, polyesters, polyamides and polysulfonamides, and particularly those that can be readily melt-spun, are preferred in the practice of this invention. It is obvious that gas, preferably inert, may be used rather than room air to yield hollow filaments. It is also obvious that, while this invention has been illustrated for round cross-section filaments, other filaments whose outer surface cross-sections are non-round (i.e. trilobal, tetralobal, serrated, etc.) may be produced.
  • the spinneret of this invention has the advantage of being simple in construction while providing a means to accurately control the filament wall thickness, provide a positive seal between the insert and spinneret and enable visual inspection of the polymer passages without removing the insert from the spinneret.
  • a spinneret for the production of hollow filaments comprising:

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Spinning Methods And Devices For Manufacturing Artificial Fibers (AREA)
US582321A 1966-09-27 1966-09-27 Sealed vented insert spinneret Expired - Lifetime US3397427A (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
US582321A US3397427A (en) 1966-09-27 1966-09-27 Sealed vented insert spinneret
GB43787/67A GB1144117A (en) 1966-09-27 1967-09-26 Spinneret for the production of hollow filaments
FR122256A FR1540564A (fr) 1966-09-27 1967-09-26 Perfectionnements aux filières servant à la production de filaments creux à partir de polymères synthétiques
CH1343667A CH454341A (de) 1966-09-27 1967-09-26 Spinndüse zur Herstellung von Hohlfäden
NL6713105A NL6713105A (enrdf_load_html_response) 1966-09-27 1967-09-26
BE704360D BE704360A (enrdf_load_html_response) 1966-09-27 1967-09-27

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US582321A US3397427A (en) 1966-09-27 1966-09-27 Sealed vented insert spinneret

Publications (1)

Publication Number Publication Date
US3397427A true US3397427A (en) 1968-08-20

Family

ID=24328687

Family Applications (1)

Application Number Title Priority Date Filing Date
US582321A Expired - Lifetime US3397427A (en) 1966-09-27 1966-09-27 Sealed vented insert spinneret

Country Status (5)

Country Link
US (1) US3397427A (enrdf_load_html_response)
BE (1) BE704360A (enrdf_load_html_response)
CH (1) CH454341A (enrdf_load_html_response)
GB (1) GB1144117A (enrdf_load_html_response)
NL (1) NL6713105A (enrdf_load_html_response)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3500498A (en) * 1966-05-28 1970-03-17 Asahi Chemical Ind Apparatus for the manufacture of conjugated sheath-core type composite fibers
US3540080A (en) * 1966-09-21 1970-11-17 Inventa Ag Device for the spinning of multicomponent synthetic fibers
US3686377A (en) * 1971-03-01 1972-08-22 Du Pont Method and apparatus for melt-spinning hollow fibers
US4229154A (en) * 1979-04-04 1980-10-21 E. I. Du Pont De Nemours And Company Spinneret for the production of hollow filaments
US4552712A (en) * 1983-06-28 1985-11-12 Union Carbide Corporation Process for reducing surface melt fracture during extrusion of ethylene polymers
US5046936A (en) * 1988-12-22 1991-09-10 Societe Lyonnaise Des Eaux, S.A. Draw plate for the production of membranes of an organic material
US5073102A (en) * 1989-12-15 1991-12-17 Pomini Farrel S.P.A. Die plate for extrusion, with discharge holes equipped with fitted inserts
US5674307A (en) * 1995-12-12 1997-10-07 Owens-Corning Fiberglas Technology, Inc. Hollow mineral fibers using rotary process
US20090011182A1 (en) * 2003-12-12 2009-01-08 Cambridge University Technical Services Limited Extrudate Having Capillary Channels
CN106757437A (zh) * 2017-01-06 2017-05-31 东华大学 一种熔纺中空纤维膜用多孔喷丝板
US20230008772A1 (en) * 2021-07-08 2023-01-12 University Of Kentucky Research Foundation Spinneret, blowing system and method for producing hollow fibers

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH272802A (de) * 1947-12-16 1951-01-15 Svit Np Verfahren und Einrichtung zur Herstellung von hohlen Kunstfasern.
US3014237A (en) * 1957-03-25 1961-12-26 Du Pont Spinneret
US3075242A (en) * 1959-06-03 1963-01-29 Heraeus Gmbh W C Spinnerette for the production of hollow filaments
US3081490A (en) * 1957-11-16 1963-03-19 Glanzstoff Ag Spinning apparatus for the spinning of hollow filaments
US3121254A (en) * 1957-12-14 1964-02-18 Glanzstoff Ag Apparatus for the spinning of hollow filaments
GB972932A (en) * 1962-02-10 1964-10-21 British Nylon Spinners Ltd Improvements in or relating to spinnerets for the production of sheath and core heterofilaments
US3197812A (en) * 1962-04-30 1965-08-03 Dietzsch Hans-Joachim Spinning head with plural nozzles

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH272802A (de) * 1947-12-16 1951-01-15 Svit Np Verfahren und Einrichtung zur Herstellung von hohlen Kunstfasern.
US3014237A (en) * 1957-03-25 1961-12-26 Du Pont Spinneret
US3081490A (en) * 1957-11-16 1963-03-19 Glanzstoff Ag Spinning apparatus for the spinning of hollow filaments
US3121254A (en) * 1957-12-14 1964-02-18 Glanzstoff Ag Apparatus for the spinning of hollow filaments
US3075242A (en) * 1959-06-03 1963-01-29 Heraeus Gmbh W C Spinnerette for the production of hollow filaments
GB972932A (en) * 1962-02-10 1964-10-21 British Nylon Spinners Ltd Improvements in or relating to spinnerets for the production of sheath and core heterofilaments
US3197812A (en) * 1962-04-30 1965-08-03 Dietzsch Hans-Joachim Spinning head with plural nozzles

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3500498A (en) * 1966-05-28 1970-03-17 Asahi Chemical Ind Apparatus for the manufacture of conjugated sheath-core type composite fibers
US3540080A (en) * 1966-09-21 1970-11-17 Inventa Ag Device for the spinning of multicomponent synthetic fibers
US3686377A (en) * 1971-03-01 1972-08-22 Du Pont Method and apparatus for melt-spinning hollow fibers
US4229154A (en) * 1979-04-04 1980-10-21 E. I. Du Pont De Nemours And Company Spinneret for the production of hollow filaments
US4552712A (en) * 1983-06-28 1985-11-12 Union Carbide Corporation Process for reducing surface melt fracture during extrusion of ethylene polymers
US5046936A (en) * 1988-12-22 1991-09-10 Societe Lyonnaise Des Eaux, S.A. Draw plate for the production of membranes of an organic material
US5073102A (en) * 1989-12-15 1991-12-17 Pomini Farrel S.P.A. Die plate for extrusion, with discharge holes equipped with fitted inserts
US5674307A (en) * 1995-12-12 1997-10-07 Owens-Corning Fiberglas Technology, Inc. Hollow mineral fibers using rotary process
US20090011182A1 (en) * 2003-12-12 2009-01-08 Cambridge University Technical Services Limited Extrudate Having Capillary Channels
US8641946B2 (en) 2003-12-12 2014-02-04 Cambridge Enterprise Limited Extrudate having capillary channels
CN106757437A (zh) * 2017-01-06 2017-05-31 东华大学 一种熔纺中空纤维膜用多孔喷丝板
US20230008772A1 (en) * 2021-07-08 2023-01-12 University Of Kentucky Research Foundation Spinneret, blowing system and method for producing hollow fibers

Also Published As

Publication number Publication date
GB1144117A (en) 1969-03-05
CH454341A (de) 1968-04-15
NL6713105A (enrdf_load_html_response) 1968-03-28
BE704360A (enrdf_load_html_response) 1968-02-01

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