US3924988A - Hollow filament spinneret - Google Patents

Hollow filament spinneret Download PDF

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Publication number
US3924988A
US3924988A US256334A US25633472A US3924988A US 3924988 A US3924988 A US 3924988A US 256334 A US256334 A US 256334A US 25633472 A US25633472 A US 25633472A US 3924988 A US3924988 A US 3924988A
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US
United States
Prior art keywords
slots
spinneret
nozzle
enlargements
ratio
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
US256334A
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English (en)
Inventor
James Dwight Hodge
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 US256334A priority Critical patent/US3924988A/en
Priority to JP48056427A priority patent/JPS4941625A/ja
Priority to IT24482/73A priority patent/IT1003083B/it
Priority to NL7307219A priority patent/NL7307219A/xx
Priority to FR7318732A priority patent/FR2185697B1/fr
Priority to GB2496373A priority patent/GB1412715A/en
Priority to DE19732326588 priority patent/DE2326588B2/de
Publication of USB256334I5 publication Critical patent/USB256334I5/en
Application granted granted Critical
Publication of US3924988A publication Critical patent/US3924988A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • 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
    • D01D4/00—Spinnerette packs; Cleaning thereof
    • D01D4/02—Spinnerettes

Definitions

  • This invention relates to an improved spinneret for the production of hollow filaments.
  • spinnerets with specially arranged arc-like slots can be used in the manufacture of synthetic filaments having a hollow core. Molten polymer forced through a slot forms a bulge and as a consequence of the bulging and the special arrangement, the polymer issuing at adjacent slot ends coalesces a short distance below the spinneret face. While spinnerets of the prior art function to produce hollow filaments, their use has led to open or ribbonized filaments after a relatively short period of operation.
  • a spinneret plate provided with at least one nozzle, said nozzle being defined by a substantially symmetrical pattern of arcuate end-to-end slots interrupted by webs, the improvement comprising, said. slots having ends bearing inner inwardly tapered enlargements at the outer one-third portions thereof, the inner onethird portion of said slot being of substantially uniform width.
  • FIGS. 1 and 2 has four arcuate orifices or slots 12 which are separated by webs l4 and otherwise surround a solid center portion 16.
  • Each of slots 12 bear inner inwardly tapered enlargements 18 at their outer ends, these enlargements are within the area extending from the center of the nozzle bounding the outer onethird portions 12a of the slots.
  • the inner one-third portion 12b of the slot is of substantially uniform width.
  • FIG. 3 shows a cross section of a filament of the type produced by the nozzles illustrated in FIG. 1.
  • the filament has a substantially circular core free of protuberances.
  • the dotted lines indicate where polymer from adjacent segments has coalesced and similarly
  • FIG. 5 illustrates a cross section of a filament produced by the nozzles shown in FIG. 4.
  • FIG. 4 shows arcuate orifices having larger, blunttipped tapered enlargements 18' with corresponding one-third portions 12a, 12b.
  • the arcuate orifices in FIGS. 1 and 4 have dimensions represented by letters a through g. Nominal values, in inches, for dimensions indicated are: a, 0.033; b, 0.004; c, 0.003; d, 0.0065; c, 0.007; f, 0.002 and g, 45.
  • the spinnerets of the present invention willpreferablyhavenozzles with four slots 12 since four webs 16 provide good strength and are readily adaptable to the production of hollow filaments with a relatively smooth, nearcircular core.
  • two, three, five or more segments may be used if desired.
  • three-segment nozzles can be used to produce triangularly shaped cores.
  • Such increases can leads-to the formationof-squarish holes and although suitable for spirally crimped filaments arising from nonuniform quenching, such filaments are not desired for use in stuffer-box crimping.
  • the enlargements must begin at the ends of a slot and not extend beyond one third the length L of the slot.- The enlargements are also tapered inwardly into the center portion l6'of the spinning nozzle. Preferably, the enlargement will not protrude more than about 35% of the distance from the inner boundary to the center of portion 16.
  • the tapering angle g should be less than and more than about 5. Preferably, 3 will be 20 to 60.
  • the area ratio, o/I, wherein 0 equals the area in square mils, of an outer one-third portion (i.e., 12a or 12a) and I equals the area, in square mils, of the inner one-third portion (12b or 12b) should be at least 1.1 and preferably should not exceed about 1.5.
  • the total area of the slot should not exceed 400 square mils.
  • the area ratio should be from about 1.15 to about 1.40.
  • a spinneret having 450 nozzles differing only in the presence of enlargements of the type shown in FIG. 1 with an area ratio of 1.16 produced hollow filaments (14% void) and no improperly coalesced filaments.
  • the tapered enlargements must be at the inner portion of the segment.
  • This particular structure causes a velocity differential to occur in polymer flow through the nozzle to set up force moments in the segments that favors coalescence.
  • Such polymer velocity differential is indicated by the arrows in FIG. 2.
  • the orifices are generally of symmetrical shape with all orifices in a nozzle being essentially the same. However, it is not necessary that all orifices be identical and variations may be introduced if desired, for instance, to produce unsymmetrical filaments.
  • the inner boundary of the segment be the arc of a circle.
  • Straight or curving lines may also serve to define the inner boundary but should not differ too greatly from a circular boundary because of changes in polymer distribution.
  • the width of the web is preferably less than the width of the arcuate segment but widths less than about 0.002 inch should be avoided because of mechanical inadequacy.
  • the spinneret of the present invention may be used to produce hollow filaments from any melt spinnable synthetic polymer exhibiting bulging during spinning and is particularly suitable for use with polyesters such as polyethylene terephthalate and its copolyesters'.
  • a spinneret plate provided with at least one nozzle, for melt spinning filaments from molten polymers, said nozzle being defined by a substantially symmetrical pattern of four arcuate end-to-end slots interrupted by webs, said nozzle forming a filament having a single hollow core
  • said slots having ends bearing inner inwardly-tapered enlargements at the outer one-third portions thereof, adjacent ends having proximate sides straight and parallel throughout their entire lengths, said slots having outer 4 boundaries, said outer boundaries being the arc of a circle, the inner one-third portion of said slot being of substantially uniform width, the ratio of the distance c between adjacent slots and the width b of the slots being less than'unity, said single hollow core being relatively smooth.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Spinning Methods And Devices For Manufacturing Artificial Fibers (AREA)
US256334A 1972-05-24 1972-05-24 Hollow filament spinneret Expired - Lifetime US3924988A (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
US256334A US3924988A (en) 1972-05-24 1972-05-24 Hollow filament spinneret
JP48056427A JPS4941625A (xx) 1972-05-24 1973-05-22
NL7307219A NL7307219A (xx) 1972-05-24 1973-05-23
FR7318732A FR2185697B1 (xx) 1972-05-24 1973-05-23
IT24482/73A IT1003083B (it) 1972-05-24 1973-05-23 Apparato per la filatura allo sta to fuso di filamenti cavi di poli mero
GB2496373A GB1412715A (en) 1972-05-24 1973-05-24 Spinneret nozzles
DE19732326588 DE2326588B2 (de) 1972-05-24 1973-05-24 Spinnduesenplatte zur herstellung von hohlfaeden

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US256334A US3924988A (en) 1972-05-24 1972-05-24 Hollow filament spinneret

Publications (2)

Publication Number Publication Date
USB256334I5 USB256334I5 (xx) 1975-01-28
US3924988A true US3924988A (en) 1975-12-09

Family

ID=22971860

Family Applications (1)

Application Number Title Priority Date Filing Date
US256334A Expired - Lifetime US3924988A (en) 1972-05-24 1972-05-24 Hollow filament spinneret

Country Status (7)

Country Link
US (1) US3924988A (xx)
JP (1) JPS4941625A (xx)
DE (1) DE2326588B2 (xx)
FR (1) FR2185697B1 (xx)
GB (1) GB1412715A (xx)
IT (1) IT1003083B (xx)
NL (1) NL7307219A (xx)

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4163641A (en) * 1977-09-20 1979-08-07 Societe Lignes Telegraphiques Et Telephoniques Extrusion tool
US4376746A (en) * 1980-04-01 1983-03-15 Ametek, Inc. Formation of hollow tapered brush bristles
US4407889A (en) * 1982-02-19 1983-10-04 E. I. Du Pont De Nemours And Company Splittable hollow polyester filament
US4444710A (en) * 1982-02-19 1984-04-24 E. I. Du Pont De Nemours And Company Process for increasing void volume of hollow filaments
US5125818A (en) * 1991-02-05 1992-06-30 Basf Corporation Spinnerette for producing bi-component trilobal filaments
US5129812A (en) * 1991-03-28 1992-07-14 Basf Corporation Multiple profile filaments from a single counterbore
US5277976A (en) * 1991-10-07 1994-01-11 Minnesota Mining And Manufacturing Company Oriented profile fibers
US5330348A (en) * 1992-08-05 1994-07-19 E. I. Du Pont De Nemours And Company Spinneret for the production of hollow filaments
US5439626A (en) * 1994-03-14 1995-08-08 E. I. Du Pont De Nemours And Company Process for making hollow nylon filaments
US20030118763A1 (en) * 2001-05-08 2003-06-26 Travelute Frederick L. Method and apparatus for high denier hollow spiral fiber
US20050147788A1 (en) * 2003-11-19 2005-07-07 Invista North America S.A R.L. Spinneret plate for producing a bulked continuous filament having a three-sided exterior cross-section and a convex six-sided central void
US20070169550A1 (en) * 2006-01-26 2007-07-26 Lally Robert W Educational accelerometer
US20110291318A1 (en) * 2008-05-16 2011-12-01 Gala Industries, Inc. Method and device for extrusion of hollow pellets
US20150001758A1 (en) * 2008-05-16 2015-01-01 Gala Industries, Inc. Method and device for extrusion of hollow pellets
KR102159212B1 (ko) * 2019-04-22 2020-09-23 주식회사 휴비스 중공사용 방사구금 및 이를 이용한 중공사 제조방법
KR102183243B1 (ko) * 2019-06-20 2020-11-26 주식회사 휴비스 중공사용 방사구금을 이용한 흡음성이 우수한 중공사
KR102183244B1 (ko) * 2019-06-20 2020-11-26 주식회사 휴비스 중공사용 방사구금을 이용한 보온성이 우수한 중공사
KR20210146147A (ko) * 2020-05-26 2021-12-03 주식회사 휴비스 두 종류의 중공복합사를 포함한 벌키성을 가지는 복원력 및 보온성이 우수한 충전재

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS51143711A (en) * 1975-06-04 1976-12-10 Kuraray Co Ltd A nozzle for hollow fibers
JPS58169507A (ja) * 1982-03-26 1983-10-06 Tanaka Kikinzoku Kogyo Kk 中空糸紡糸用口金
JPH0514166U (ja) * 1991-07-31 1993-02-23 帝人株式会社 中空糸用紡糸口金
JP3866843B2 (ja) * 1997-11-17 2007-01-10 帝人ファイバー株式会社 中空糸用紡糸口金
CN115874299B (zh) * 2022-12-21 2024-06-28 江苏恒科新材料有限公司 一种内五角星形高中空聚酯纤维及其制备方法及喷丝板

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3313000A (en) * 1965-07-13 1967-04-11 Du Pont Spinneret plate
US3323168A (en) * 1962-05-24 1967-06-06 American Enka Corp Spinneret for spinning hollow filaments
US3600491A (en) * 1968-02-14 1971-08-17 Japan Exlan Co Ltd Production of hollow acrylic fibers
US3772137A (en) * 1968-09-30 1973-11-13 Du Pont Polyester pillow batt

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3323168A (en) * 1962-05-24 1967-06-06 American Enka Corp Spinneret for spinning hollow filaments
US3313000A (en) * 1965-07-13 1967-04-11 Du Pont Spinneret plate
US3600491A (en) * 1968-02-14 1971-08-17 Japan Exlan Co Ltd Production of hollow acrylic fibers
US3772137A (en) * 1968-09-30 1973-11-13 Du Pont Polyester pillow batt

Cited By (30)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4163641A (en) * 1977-09-20 1979-08-07 Societe Lignes Telegraphiques Et Telephoniques Extrusion tool
US4376746A (en) * 1980-04-01 1983-03-15 Ametek, Inc. Formation of hollow tapered brush bristles
US4407889A (en) * 1982-02-19 1983-10-04 E. I. Du Pont De Nemours And Company Splittable hollow polyester filament
US4444710A (en) * 1982-02-19 1984-04-24 E. I. Du Pont De Nemours And Company Process for increasing void volume of hollow filaments
US5125818A (en) * 1991-02-05 1992-06-30 Basf Corporation Spinnerette for producing bi-component trilobal filaments
US5129812A (en) * 1991-03-28 1992-07-14 Basf Corporation Multiple profile filaments from a single counterbore
US5277976A (en) * 1991-10-07 1994-01-11 Minnesota Mining And Manufacturing Company Oriented profile fibers
US5330348A (en) * 1992-08-05 1994-07-19 E. I. Du Pont De Nemours And Company Spinneret for the production of hollow filaments
US5439626A (en) * 1994-03-14 1995-08-08 E. I. Du Pont De Nemours And Company Process for making hollow nylon filaments
US5604036A (en) * 1994-03-14 1997-02-18 E. I. Du Pont De Nemours And Company Hollow nylon filaments
US5643660A (en) * 1994-03-14 1997-07-01 E. I. Du Pont De Nemours And Company Hollow nylon filaments and yarns
US20050037196A1 (en) * 2001-05-08 2005-02-17 Travelute Frederick L. Method and apparatus for high denier hollow spiral fiber
US20070231519A1 (en) * 2001-05-08 2007-10-04 Wellman, Inc. Method and Apparatus for High Denier Hollow Spiral Fiber
US6797209B2 (en) 2001-05-08 2004-09-28 Wellman, Inc. Method and apparatus for high denier hollow spiral fiber
US20030118763A1 (en) * 2001-05-08 2003-06-26 Travelute Frederick L. Method and apparatus for high denier hollow spiral fiber
US6746230B2 (en) 2001-05-08 2004-06-08 Wellman, Inc. Apparatus for high denier hollow spiral fiber
US20060014015A1 (en) * 2001-05-08 2006-01-19 Travelute Frederick L Method and apparatus for high denier hollow spiral fiber
US7001664B2 (en) 2001-05-08 2006-02-21 Wellman, Inc. Method and apparatus for high denier hollow spiral fiber
US7229688B2 (en) 2001-05-08 2007-06-12 Wellman, Inc. Method and apparatus for high denier hollow spiral fiber
US20050147788A1 (en) * 2003-11-19 2005-07-07 Invista North America S.A R.L. Spinneret plate for producing a bulked continuous filament having a three-sided exterior cross-section and a convex six-sided central void
US20070169550A1 (en) * 2006-01-26 2007-07-26 Lally Robert W Educational accelerometer
US20110291318A1 (en) * 2008-05-16 2011-12-01 Gala Industries, Inc. Method and device for extrusion of hollow pellets
US8834760B2 (en) * 2008-05-16 2014-09-16 Gala Industries, Inc. Method and device for extrusion of hollow pellets
US20150001758A1 (en) * 2008-05-16 2015-01-01 Gala Industries, Inc. Method and device for extrusion of hollow pellets
US9815223B2 (en) * 2008-05-16 2017-11-14 Gala Industries, Inc. Method and device for extrusion of hollow pellets
KR102159212B1 (ko) * 2019-04-22 2020-09-23 주식회사 휴비스 중공사용 방사구금 및 이를 이용한 중공사 제조방법
KR102183243B1 (ko) * 2019-06-20 2020-11-26 주식회사 휴비스 중공사용 방사구금을 이용한 흡음성이 우수한 중공사
KR102183244B1 (ko) * 2019-06-20 2020-11-26 주식회사 휴비스 중공사용 방사구금을 이용한 보온성이 우수한 중공사
KR20210146147A (ko) * 2020-05-26 2021-12-03 주식회사 휴비스 두 종류의 중공복합사를 포함한 벌키성을 가지는 복원력 및 보온성이 우수한 충전재
KR102347840B1 (ko) 2020-05-26 2022-01-07 주식회사 휴비스 두 종류의 중공복합사를 포함한 벌키성을 가지는 복원력 및 보온성이 우수한 충전재

Also Published As

Publication number Publication date
FR2185697A1 (xx) 1974-01-04
DE2326588B2 (de) 1976-09-16
NL7307219A (xx) 1973-11-27
IT1003083B (it) 1976-06-10
DE2326588A1 (de) 1973-11-29
FR2185697B1 (xx) 1976-04-23
GB1412715A (en) 1975-11-05
USB256334I5 (xx) 1975-01-28
JPS4941625A (xx) 1974-04-19

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