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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Prior art keywords
slots
spinneret
nozzle
enlargements
ratio
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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
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US256334A
Inventor
James Dwight Hodge
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EIDP Inc
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EI Du Pont de Nemours and Co
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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 FR7318732A priority patent/FR2185697B1/fr
Priority to NL7307219A priority patent/NL7307219A/xx
Priority to IT24482/73A priority patent/IT1003083B/en
Priority to DE19732326588 priority patent/DE2326588B2/en
Priority to GB2496373A priority patent/GB1412715A/en
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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    • 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.

Abstract

A spinneret provided with a spinning nozzle having a plurality of arcuate segments whose ends bear inner, inwardly tapered enlargements at the outer one-third portions of the segments.

Description

United States Patent 1191 [1113 3,924,988
Hodge 5] Dec. 9, 1975 HOLLOW FILAMENT SPINNERET [75] Inventor: James Dwight Hodge, Greenville, [56] References Cited N.C. UNITED STATES PATENTS [73 Assignee; L Du Pom de Nemours & Co 3,313,000 4/1967 Hays 425/461 Wilmington ,323,168 6/1967 Van Drunen et a1 425/461 3,600,491 8/1971 Shimoda et a1. 425/3822 [22] Filed: May 24, 1972 3,772,137 11/1973 Batt 264/177 F UX [211 Appl. No.2 256,334
[44] Published under the Trial Voluntary Protest Program on January 28, 1975 as document no. [57] ABSTRACT B 256,334.
Primary ExaminerRobert D. Baldwin A spinneret provided with a spinning nozzle having a plurality of arcuate segments whose ends bear inner,
CCll 425/46 45 5/3433 inwardly tapered enlargements at the outer One-thi,d 58 Field of Search 425/461, 464, 466, 198, Pomons Ofthe Segments' 425/3822; 239/601; 264/176 F, 177 F 5 Claims, 5 Drawing Figures US. Patent Dec. 9, 1975 EEG FIGEI' FIG- FIG-
HOLLOW FILAMENT SPINNERET.
BACKGROUND OF THE INVENTION I This invention relates to an improved spinneret for the production of hollow filaments.
It is well known that 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.
SUMMARY OF THE INVENTION In 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.
BRIEF DESCRIPTION OF THE DRAWINGS DETAILED DESCRIPTION OF THE ILLUSTRATED EMBODIMENTS Only one of the plurality of spinning nozzles usually provided in a spinneret plate has been shown. The nozzle in 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. However, two, three, five or more segments may be used if desired. For example, three-segment nozzles can be used to produce triangularly shaped cores. In some instances, for example, when relatively high-velocity cooling air. is used; to quench the molten polymer near the spinneret face, it maybe desirable to increase the amount of polymer?v in the vicinity of the point of coalescence by increasing the size of the enlargements. 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. In addition, the total area of the slot should not exceed 400 square mils. Preferably, the area ratio should be from about 1.15 to about 1.40.
A spinneret having 450 nozzles similar to those of FIG. 1 but without the enlargements, having an area ratio of about 1.0, was used to make hollow filaments and in periodical determinations was found to produce hollow filaments (17% void) with up to 20 improperly coalesced filaments. Under identical conditions, 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.
In the spinnerets of this invention, 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.
It is not essential that 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. In the practice of the present invention, 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.
It has been found in practice that the viscosity of the molten polymer varies more than the other factors and when the coalescence performance is borderline, dayto-day variations in viscosity can lead to continuing interruptions of the process. The spinnerets of the present invention are less sensitive to fluctuations in viscosity and have been much more effective in producing hollow filaments having a low denier per filament.
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'.
What is claimed is:
1. In 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 the improvement comprising, 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.
2. The spinneret plate as defined in claim 1, the ratio of the area of an outer one-third portion to the area of the inner one-third portion being in the range of from about 1.15 to about 1.40.
3. The spinneret plate as defined in claim 2, said ratio being 1.16.
4. The spinneret as defined in claim 1, said enlargements being inwardly tapered at an angle with respect to the end of the slot of less than and more than about 5.
5. The spinneret as defined in claim 4, said angle being between 20 to 60.

Claims (5)

1. In 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 the improvement comprising, 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 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.
2. The spinneret plate as defined in claim 1, the ratio of the area of an outer one-third portion to the area of the inner one-third portion being in the range of from about 1.15 to about 1.40.
3. The spinneret plate as defined in claim 2, said ratio being 1.16.
4. The spinneret as defined in claim 1, said enlargements being inwardly tapered at an angle with respect to the end of the slot of less than 80* and more than about 5*.
5. The spinneret as defined in claim 4, said angle being between 20* to 60* .
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 (en) 1972-05-24 1973-05-22
NL7307219A NL7307219A (en) 1972-05-24 1973-05-23
IT24482/73A IT1003083B (en) 1972-05-24 1973-05-23 APPARATUS FOR MELTED SPINNING OF HOLLOW POLYMERO FILAMENTS
FR7318732A FR2185697B1 (en) 1972-05-24 1973-05-23
DE19732326588 DE2326588B2 (en) 1972-05-24 1973-05-24 SPINNER NOZZLE PLATE FOR THE PRODUCTION OF HOLLOW THREADS
GB2496373A GB1412715A (en) 1972-05-24 1973-05-24 Spinneret nozzles

Applications Claiming Priority (1)

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

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USB256334I5 USB256334I5 (en) 1975-01-28
US3924988A true US3924988A (en) 1975-12-09

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US256334A Expired - Lifetime US3924988A (en) 1972-05-24 1972-05-24 Hollow filament spinneret

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

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 (en) * 2019-04-22 2020-09-23 주식회사 휴비스 Spinneret for Hollow Fiber and A method for preparingHollow fiber using the same
KR102183244B1 (en) * 2019-06-20 2020-11-26 주식회사 휴비스 Hollow Fiber Yarn Excellent In Thermal Insulation Using Spinneret For Hollow Fiber
KR102183243B1 (en) * 2019-06-20 2020-11-26 주식회사 휴비스 Hollow Fiber Yarn Excellent In Sound Absorption Using Spinneret For Hollow Fiber
KR20210146147A (en) * 2020-05-26 2021-12-03 주식회사 휴비스 Filler With Excellent Bulkiness and Excellent Heat Retention, Including Two Types Of Hollow Composite Yarn

Families Citing this family (4)

* 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 (en) * 1982-03-26 1983-10-06 Tanaka Kikinzoku Kogyo Kk Spinneret for hollow fiber
JPH0514166U (en) * 1991-07-31 1993-02-23 帝人株式会社 Spinneret for hollow fibers
JP3866843B2 (en) * 1997-11-17 2007-01-10 帝人ファイバー株式会社 Spinneret for hollow fiber

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 (en) * 2019-04-22 2020-09-23 주식회사 휴비스 Spinneret for Hollow Fiber and A method for preparingHollow fiber using the same
KR102183244B1 (en) * 2019-06-20 2020-11-26 주식회사 휴비스 Hollow Fiber Yarn Excellent In Thermal Insulation Using Spinneret For Hollow Fiber
KR102183243B1 (en) * 2019-06-20 2020-11-26 주식회사 휴비스 Hollow Fiber Yarn Excellent In Sound Absorption Using Spinneret For Hollow Fiber
KR20210146147A (en) * 2020-05-26 2021-12-03 주식회사 휴비스 Filler With Excellent Bulkiness and Excellent Heat Retention, Including Two Types Of Hollow Composite Yarn
KR102347840B1 (en) 2020-05-26 2022-01-07 주식회사 휴비스 Filler With Excellent Bulkiness and Excellent Heat Retention, Including Two Types Of Hollow Composite Yarn

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

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