US3640670A - Spinnerette for extruding t-shaped filaments - Google Patents

Spinnerette for extruding t-shaped filaments Download PDF

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US3640670A
US3640670A US745652*A US3640670DA US3640670A US 3640670 A US3640670 A US 3640670A US 3640670D A US3640670D A US 3640670DA US 3640670 A US3640670 A US 3640670A
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spinnerette
crossbar
stem
filaments
center
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Paul Paliyenko
Werner E Beier
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Celanese Corp
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Fiber Industries Inc
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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
    • D01D5/253—Formation of filaments, threads, or the like with a non-circular cross section; Spinnerette packs therefor

Definitions

  • ABSTRACT Spinnerette for extruding filament-forming material having a plurality of T-shaped orifices wherein the orifices are arranged annularly with respect to the center of the spinnerette.
  • Each of the T-shaped orifices comprises a crossbar and a stem extending perpendicularly from the crossbar at its midpoint with the stem facing away from the center of the spinnerette.”
  • Further embodiments of the spinnerette include a split T-configuration and the method of spinning Tcross-section filaments.
  • noncircular filaments i.e., filaments having other than a round cross section
  • filaments having other than a round cross section By altering the cross-sectional shape of the filaments it is possible to produce yarns with a mixture of the properties normally associated with two distinct fibers.
  • One example of this is a nylon yarn with filaments of triangular cross section which has high abrasion resistance and tensile strength normally associated with nylon, combined with appearance and handle similar to natural silk.
  • a wide variety of non circular cross-sectional filaments have been provided. Such filament shapes as ribbons, cruciform, trilobal and other multilobal shapes are known to exist and possess certain desirable properties.
  • noncircular filaments The simplest way of producing noncircular filaments is to use non circular holes for extrusion. However, in meltspinning the newly formed filaments remain in a mobile liquid fonn for an appreciable period after extnlsion. During this time the surface tension tends to draw the filament perimeter into a circle, but the flow necessary for this change in shape is restricted by the viscosity of the molten filament-forming material. It has been discovered, as hereinafter more fully described, that a noncircular hole generally results in a filament having a cross-sectional configuration intermediate between the hole shape and a circle.
  • the cross section of the filament can be made closer to the hole shape by increasing the viscosity of the polymer (by using a polymer of higher molecular weight or by spinning at a lower temperature) i.e., setting the extruded filamentary material more rapidly.
  • the best results in the production of noncircular filaments with noncircular holes are obtained therefore with high viscosity polymer and high cooling rates.
  • Filaments produced from very high viscosity polymer have lower dye-uptake than those produced from standard viscosity polymers. Excessive cooling tends to introduce variability into the product due to difficulty in controlling such conditions.
  • Another method known in the art for producing yarns having filaments of noncircular cross section is to fuse or coalesce together a number of circular or other shaped filaments such as, for example, ribbon or flat shaped filaments, to give composite filaments of various shapes.
  • the filament cross section often looks more like an inverted bell or pear rather than a sharply defined T.
  • a filament is said to knee" when the line of fiow of the filament is bent out of the vertical at an angle back toward the spinnerette face.
  • the filament is bent to such an extent that the filament touches the spinnerette face and ceases to flow as a filament, it is said to lick-back and forms what is known as a drip or blob of filament-forming material.
  • T- shaped cross section filaments having certain desirable physical and aesthetic characteristics compared with regular cross section filaments such as better drapability, greater resistance to matting in carpets, better dye uniformity, better resiliency, better bulking properties, better filaments for texturing, better cover, sparkly luster, crisper hand and the like.
  • a spinnerette for extruding filament-forming polymeric material having a plurality of T-shaped orifices, said orifices being arranged annularly with respect to the center of the spinnerette, each of said T-shaped orifices comprising a crossbar and a stern extending perpendicularly from the crossbar at its midpoint, at least half of said stems facing away from the center of the spinnerette, said orifice having a hole aspect ratio (HAR) of about 2.6 to 86 as expressed by the equation:
  • HAR hole aspect ratio
  • a spinnerette having a split T-orifice wherein the crossbar and stem are separated by a gap of up to about 0.008 inch.
  • the split T-orifice not only eliminates kneeing independent of the placement of the orifice in the spinnerette but also results in the production of a novel T-cross-section of an unusually high filament aspect ratio in the range of 2.5 to 5.0.
  • the present invention provides a spinnerette particularly useful for producing T-cross-section filaments while eliminating difiiculties with kneeing filament coalescence, drops and consequent deformities in the spun filaments by (l) utilizing a novel split T-orifice and/or (2) positioning the T-orifices in annular arrangement with the stem of the T facing away from the center of the spinnerette plate.
  • Particular novel yarn effects can be achieved by the present spinnerette and method while eliminating the problem of filament coalescence by alternating the position of the T- orifices wherein at least half of the stems of the T-orifice face away from the center of the spinnerette plate.
  • the use of the split T eliminates kneeing and the consequent spinning difficulties independent of the placement thereof in the spinnerette plate.
  • FIG. 1 is a plan view of a spinnerette plate used heretofore for the spinning ofT-shaped filaments
  • FIG. 2 is a partial schematic sectional view with enlarged detail of a spinnerette assembly including cross section of the spinnerette plate shown in FIG. 1 taken on lines 22 thereof showing the filaments kneeing toward the center of the spinnerette;
  • FIG. 3 is a plan view of a spinnerette plate having T-shaped orifices arranged annularly and in accordance with the present invention
  • FIG. 4 is a partial schematic sectional view with enlarged detail of a spinnerette assembly including a cross section of the spinnerette plate shown in FIG. 3, taken on line 4-4 thereof, showing extrusion of the T-shaped filaments without kneeing;
  • FIG. 5 is a greatly enlarged plan view of one of the T-shaped orifices in the spinnerette plate shown in FIG. 3;
  • FIG. 6 is a sectional view of a filament extruded from the T- shaped orifice shown in FIG. 5;
  • FIG. 7 is a plan view of a spinnerette plate having a plurality of pairs of slots arranged annularly to form split T-orifices according to the invention wherein the stem of the T is faced inwardly as can be conveniently used with the spit T;
  • FIG. 8 is a greatly enlarged view of one of the split T-orifices in the spinnerette plate shown in FIG. 7;
  • FIG. 9 is a sectional view of a well-defined T-shaped filament extruded from a split T-orifice constructed in accordance with FIG. 8.
  • a filament having a generally T-shaped cross section is formed from filamentforming material without kneeing or the formation of drips or blobs by extruding such material through T-shaped orifices arranged annularly in a spinnerette plate with the stem of the T pointed away from the center of the spinnerette.
  • FIG. I a spinnerette plate, designated generally by reference numeral 10, used prior to the invention herein for the spinning of filaments having a generally T-shaped cross section.
  • Spinnerette plate 10 has an annular body portion 12 by which the spinnerette plate is fastened to a spinnerette assembly l3, diagrammatically shown in FIG. 2, for the extrusion of filament-forming material.
  • the spinnerette plate 10 has a plurality of T-shaped orifices 14 having crossbars l5 and stems 16.
  • the orifices 14 are arranged annularly in the spinnerette 10 with stems 16 of the T-shaped orifices l4 directed toward the center of the spinnerette.
  • the thermoplastic filament-forming material as is diagrammatically shown in FIG. 2, is subjected to heat and pressure in feed zone next to spinnerette plate 10.
  • the temperature in this zone is sufficient to maintain the fiber-forming material in a molten condition whereby the molten material is forced through the orifices 14 to form a plurality of filamentary structures 17.
  • the extruded filamentary material is subjected to controlled cooling conditions such as is provided by a spinning cabinet or the like (not shown).
  • a flow of inert gas is conventionally employed in a zone directly adjacent to and in front of the face of spinnerette 10 which brings the molten material to the desired solidified condition in the form of solid filaments I7.
  • T-shaped filaments 17 has been accomplished by kneeing, as is illustrated in FIG. 2 of the drawing.
  • Filaments 17 are bent out of the vertical flow line inwardly toward the center of spinnerette plate 10 forming an angle with respect to the face 18 of the spinnerette plate.
  • the filamentary material is bent to such an angle as to cause lickingback, i.e., contact with the spinnerette plate face 18 thereby resulting in a drip or blob of filament-forming material on the fiber.
  • the blob increases in size and runs back into the orifice opening, causing the opening to be either wholly or partially blocked-0H.
  • Such blocked orifices result in either no filament being formed at all, or alternatively, filaments of lesser diameter and/or defonned cross sections being formed which, with subsequent drawing, results in numerous broken filaments and nonuniformity in the yarn produced.
  • the particular arrangement of the T-shaped orifices 14 in the spinnerette plate influences the kneeing of the filaments and the formation of drips or blobs. It has been found that kneeing can be substantially eliminated by reversing the direction of the stem of the T, that is, so that the stem of the T points away from the center of the spinnerette rather than toward the center of the spinnerette. To the extent that kneeing is not completely eliminated, as may be encountered under certain spinning conditions, the spun filaments are directed away from each other thereby preventing coalescence of the various filaments.
  • Such an arrangement of T shaped orifices 14 is shown in spinnerette plate 19 disclosed in FIG. 3 of the drawing.
  • Spinnerette plate 19 is provided with an annular rim 20 which aids in the fastening of the plate into spinnerette assembly 13 as is disclosed diagrammatically in FIG. 4 of the drawing.
  • Spinnerette plate 19 is provided with a plurality of T- shaped orifices 14 which are arranged annularly in a circle that is preferably concentric with annular rim 20.
  • Stems 16 of the orifices l4 lie on an imaginary radius of the spinnerette plate 19 and, contrary to the arrangement shown in FIG. 1, all face away from the center of the spinnerette.
  • the modification ratio (M) hereinafter called the filament aspect ratio (FAR), as defined in U.S. Pat. No. 2,939,201, is the ratio of the radius a to the radius b of a circle having a center 0 inscribed within the filament cross section.
  • FAR filament aspect ratio
  • the FAR may vary from as little as about 1.2 to as much as 5.0 or more.
  • the FAR is in the range of about 1.8 to 2.6 for a conventional T-shape and about 2.5 to 5.0 for a split T, exact number depending on denier per filament and specific fabric properties such as cover, luster, crisp handle and mechanical quality of the yarn and the like.
  • noncircularity or filament aspect ratio As defined more fully hereinafter, has been found to be controlled or varied according to the hole aspect ratio (HAR), polymer type, polymer intrinsic-viscosity, throughput per hole for a given hole size or actually extrusion velocity, spinning temperature, and the rate of quench and the like, which factors are preferably described for polyester by the following relationship:
  • FAR 1.89[2.0I X AT]+[1.05 X l0' AV]+[6.56AIV] +[8.85 X I0-'AI-IAR]+[3.0 X IO' AQ]
  • FAR filament aspect ratio T spinning temperature degrees centigrade
  • V extrusion velocity feet per minute
  • IV polymer intrinsic viscosity
  • AT T-290 C.
  • filaments 22 extruded from spinnerette plate 19 desirably have a generally T-shaped cross section as shown in FIG. 6, it has been discovered that under extreme conditions even circular filaments can, if desired, be extruded from such noncircular holes. Conditions such as low IV. and high spinning temperatures would produce circular filaments as can be determined from the above equation.
  • FIG. 5 there is shown in a greatly enlarged view one of orifices 14 in spinnerette plate 19.
  • the T-shaped orifice 14 has a crossbar 15 and a tail or stem 16.
  • Crossbar 15 has a width (W,) which may vary from about 0.002 to 0.020 inch and a length (L which may vary from about 0.008 to 0.060 inch. More preferably, the width W, is in the range of about 0.003 to 0.012 inch and the length L 0.010 to 0.040 inch.
  • Stem l6 likewise has a lengthwise dimension (L,) which may vary from about 0.007 to 0.060 inch and a widthwise dimension (W which may vary from about 0.002 to 0.020 inch. More preferably, the L, is about 0.010 to 0.040 inch and the W, is 0.003 to 0.012 inch. A most preferred orifice had a crossbar measuring 0.018 X 0.004 inch and a stern measuring 0.016 X 0.004 inch.
  • the dimension (z) is the distance in inches from the center of crossbar 15 to point 25, the intersection between crossbar 15 and stem 16.
  • the range of each of y/z and x/z varies from 1.3 to 43.0. Quite desirably, the ratio of each is greater than 1.3 thus resulting in an HAR ranging from about 2.6 to 86.0. More preferably, the range of HAR is between about 5.0 and 25.0.
  • the trilobal cross section of filaments produced in accordance with the description herein, as shown in FIG. 6, are asymmetrical.
  • the filaments herein disclosed have a unique combination of convex and concave sides which contribute to the attainment of certain desired specialty effects.
  • filament 22 has three lobate tip portions 33, 34 and 35 joining together two concave sides 36, 37 and one convex side 38.
  • the lobe 34 opposite the convex side is longer than the other two lobes 33 and 35.
  • the FAR i.e., the ratio of radius a over radius b extending from center 0, e.g., a/b, radius a always being the larger radius, can be varied by varying the hole aspect ratio (HAR), as seen more clearly from the above formula.
  • HAR hole aspect ratio
  • filament 22 is asymmetrical; however, it does have one plane of symmetry.
  • the filament 32 is symmetrical with respect to a line 30-30 which bisects convex side 38 and lobe 34.
  • a T-shaped cross section filament can be extruded without kneeing and the formation of drips by extruding filamentforming material through a split T-orifice 39 illustrated in FIG. 7 independent of the positioning of the T-orifice with respect to the center of the spinnerette.
  • a split T-orifice 39 illustrated in FIG. 7 independent of the positioning of the T-orifice with respect to the center of the spinnerette.
  • the split T orifice allows spinning of filaments having a relatively well-defined T-cross-section over a wide range of spinning conditions thereby allowing for better control of yarn properties, such as tenacity and elongation, and better process economies.
  • the split T-orifice 39 in spinnerette plate 40 is more clearly illustrated in FIG. 8.
  • the orifice has a slot forming crossbar 41 having a length L and width W and a slot forming tail or stem 42 having a length L" and width W".
  • Stem 42 depends perpendicularly from crossbar 41 at substantially the midpoint of crossbar 41.
  • the dimensions of crossbar 41 and stem 42 of the split T correspond to those given for the regular T-shaped orifice wherein the stem is preferably greater than one-half the length of the crossbar.
  • stem 42 is spaced from the crossbar 41 so as to form a gap (s) therebetween by a distance which may be from about 0.0001 inch to about 0.008 inch, more preferably about 0.002 inch.
  • filament 43 has three asymmetrical lobes 44, 45, 46 integrally joined together and forming one convex side 47 and two concave sides 48 and 49.
  • the filament is seen to be asymmetrical with respect to line 5050 which bisects convex side 47 and the longer of the three lobes 45.
  • melt spinning fiber-forming material While the invention has been described more specifically above with respect to melt spinning fiber-forming material, it is deemed applicable broadly to all types of fiber-forming materials whether such materials are melt spun, dry spun or wet spun although melt spinning is most preferred to obtain the definition of filament cross section more specifically described herein.
  • melt spinnable polymers which may be used in the practice of this invention are the polyamides, such as polyhexamethylene adipamide, and polyepsiloncaprolactam, polyesters such as polyethylene terephthalate or copolymers derived from ethylene glycol, terephthalate acid and up to mol percent of some other dibasic acid, polyethylene, polypropylene and meltable cellulose derivatives.
  • plasticized melt spinnable fibers such as acrylonitrile may be utilized.
  • various additives may be included in the filament-forming composition, e.g., delustrants, oxidation inhibitors, dye additives and the like.
  • the denier of the filaments may vary within.wide limits. Denier in the range of from 1.0 to 20.0 are usually preferred, however, deniers of 40 or higher may be utilized, depending on the end use of the textile material being prepared.
  • a l/l6-inch stainless steel spinnerette plate was prepared according to conventional techniques having 24 T-shaped orifices therein, such being annularly arranged as is shown in FIG. 1 of the drawing.
  • the crossbar of the T-shaped orifices had a length of about 0.020 inch and a width of about 0.006 inch
  • the stem which as is shown in FIG. 1, is directed toward the center of the spinnerette, had a length of about 0.020 inch, (not including the crossbar width) and a width of about 0.004 inch.
  • Polyethylene terephthalate having an intrinsic viscosity of 0.60 deciliters per gram (as measured at 25 C. using 8 grams of polymer in 100 cubic centimeters of O-chlorophenol), and containing 0.4 percent titanium dioxide, was spun at 3.5 pounds per hour throughput at a spinning temperature of about 285 C. from the spinnerette described above using a standard metering pump.
  • the filaments extruding from the spinnerette were quenched with an 8 cubic feet per minute air inflow and were collected in a single filament bundle.
  • the filament bundle was wound up at a speed of about 3,500 feet per minute (f.p.m.).
  • the filament bundle had a spun denier of about 230.
  • the FAR was determined by measurement (as described on page 10) and was found to be 2.0. Photographs of the cross section of the spun filaments were taken at 400x magnification and the cross section was generally that as is shown in FIG. 6.
  • the cross-sectional shape, as one can determine from examining FIG. 6 was a distorted T with a bulging crossbar and a relatively small taillike stem.
  • Example 2 Polyethylene terephthalate polymer as in Example I was extruded through the same spinnerette as described therein at a spinning temperature of about 300 C. at a throughput of 1.75 pounds per hour. The extruded filaments were collected and wound up at 3,500 feet per minute. The spun denier was 120. The resulting filament aspect ratio was determined to be l.2.
  • EXAMPLE 3 A spinnerette having 36 T-shaped orifices arranged annularly, with respect to the center of the spinnerette plate, wherein the crossbar dimension was 0.018 inch by 0.004 inch and the stem dimension was 0.018 inch by 0.004 inch was prepared according to conventional techniques. However, in contrast to the spinnerette described in Example 1, the stem of the T-shaped orifice was pointed away from the center of the spinnerette as is shown in FIG. 3 of the drawing.
  • Polyethylene terephthalate polymer having an intrinsic viscosity of 0.60 was extruded through the T-shaped holes at a throughput of about 4.3 pounds per hour at a spinning temperature of about 290 C. to provide a bundle of filaments having a total denier of 230.
  • a controlled quench of 10 standard cubic feet per minute air was employed.
  • the filament bundle was wound up at 4,000 feet per minute.
  • the filaments were determined to have a filament aspect ratio of 2. l.
  • the filaments did not knee during extrusion and no breaks or coalescence of filaments were ex perienced during the spinning run.
  • a similar spinnerette having a 0.018 by 0.004 inch crossbar and a 0.016 by 0.004 inch stem was used to spin lower denier per filament yarn with correspondingly good results.
  • EXAMPLE 4 A spinnerette having a plurality of pairs of slots, seven in number, was manufactured according to usual techniques with the pair of slots arranged annularly, as shown in FIG. 7, to form a circle of split T-orifices.
  • the slot forming the crossbar of the T was 0.025 by 0.004 inches and the slot forming the stem of the T was 0.020 by 0.004.
  • the bridge or spacing separating the crossbar slot and stem slot was about 0.002 inch.
  • Polyethylene terephthalate polymer having an intrinsic viscosity (I.V.) of about 0.60 was extruded at a rate of about 3 pounds per hour throughput through the described spinnerette at a spinning temperature of about 290 C. thereby producing a bundle of filaments having a spun denier of about 70.
  • the filament bundle was wound up at about 1,750 feet per minute.
  • the polymeric material extruding from the crossbar and stem slots was quenched with an air inflow of about 8 standard cubic feet per minute and coalesced at about A inch from the spinnerette face to form a filament having a T-cross-section.
  • the filament as shown in FIG. 9 of the drawing had a well-defined T-cross-sectional shape.
  • the filament aspect ratio was determined to be 3.28.
  • Yarn comprising filaments with the cross-sectional configuration specified in this invention are useful in a wide variety of textile products. They may be used to advantage in all sorts of woven materials including hosiery, lingerie and other lightweight knit structures. They are useful as feed yarns in a large number of bulking processes such as the wellknown stuffer box crimping process, the jet bulking process and the various false twist crimping techniques.
  • the crimped product prepared by any of these processes may be used in sweaters, upholstery, carpets, underwear, shirting materials and the like.
  • the crimped product may also be cut up into staple and recombined in the form of a staple yarn. These yarns, of course, are useful for preparing suiting materials, sweaters and a wide variety of bulky textile materials.
  • a spinnerette for extruding filament-forming polymeric material having a plurality of T-shaped orifices, each of said T- shaped orifices comprising a crossbar and a stem extending perpendicularly from the crossbar at its midpoint, said orifices being arranged annularly with respect to the center of the spinnerette such that substantially all of said stems face away from the center of the spinnerette, said orifice having a hole aspect ratio (HAR) of about 2.6 to 86 as expressed by the equation:
  • the spinnerette of claim 1 wherein the length of the crossbar and the length of the stem is independently selected from the range of about 0.007 to 0.060 inch and the width of the crossbar and the stem is independently selected from the range of about 0.002 to 0.020 inch.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Spinning Methods And Devices For Manufacturing Artificial Fibers (AREA)
  • Artificial Filaments (AREA)
US745652*A 1968-06-20 1968-06-20 Spinnerette for extruding t-shaped filaments Expired - Lifetime US3640670A (en)

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3981948A (en) * 1975-01-02 1976-09-21 Eastman Kodak Company Arrangements in spinnerets of spinning orifices having significant kneeing potential
US4142850A (en) * 1975-01-02 1979-03-06 Eastman Kodak Company Non-kneeing spinning orifices for spinnerets
US4473386A (en) * 1983-07-21 1984-09-25 Strickland Edward T Method and apparatus for fiber production from heat softenable material
US5057368A (en) * 1989-12-21 1991-10-15 Allied-Signal Filaments having trilobal or quadrilobal cross-sections
US20060012072A1 (en) * 2004-07-16 2006-01-19 Hagewood John F Forming shaped fiber fabrics
EP2427600A1 (en) * 2009-05-06 2012-03-14 Saltex OY Pile yarn filament for artificial turf, artificial turf, and method for making pile yarn filament
WO2021135083A1 (zh) * 2019-12-29 2021-07-08 江苏恒力化纤股份有限公司 一种仿棉聚酯纤维及其制备方法

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5117326A (en) * 1974-07-31 1976-02-12 Kuraray Co T gataikeidanmenseni oyobi sonoseizoho
JPS5259723A (en) * 1975-11-05 1977-05-17 Kuraray Co Ltd Crimped yarns with t-sharped cross section and their preparation

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US2538918A (en) * 1944-09-15 1951-01-23 Comptoir Ind Etirage Die for the extrusion of metals
US3038237A (en) * 1958-11-03 1962-06-12 Du Pont Novel crimped and crimpable filaments and their preparation
GB900441A (en) * 1960-04-06 1962-07-04 Rhodiaceta Artificial filaments and threads
US3121040A (en) * 1962-10-19 1964-02-11 Polymers Inc Unoriented polyolefin filaments
US3135646A (en) * 1961-05-05 1964-06-02 Du Pont Helically crimped textile filaments
FR1449751A (fr) * 1964-06-22 1966-05-06 Snia Viscosa Procédé et dispositifs pour la production de filés synthétiques de section asymétrique
US3323168A (en) * 1962-05-24 1967-06-06 American Enka Corp Spinneret for spinning hollow filaments
US3405424A (en) * 1966-10-27 1968-10-15 Inventa Ag Device and process for the manufacture of hollow synthetic fibers
US3499958A (en) * 1965-11-08 1970-03-10 Rhodiaceta Process for obtaining x-shaped filaments

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2538918A (en) * 1944-09-15 1951-01-23 Comptoir Ind Etirage Die for the extrusion of metals
US3038237A (en) * 1958-11-03 1962-06-12 Du Pont Novel crimped and crimpable filaments and their preparation
GB900441A (en) * 1960-04-06 1962-07-04 Rhodiaceta Artificial filaments and threads
US3135646A (en) * 1961-05-05 1964-06-02 Du Pont Helically crimped textile filaments
US3323168A (en) * 1962-05-24 1967-06-06 American Enka Corp Spinneret for spinning hollow filaments
US3121040A (en) * 1962-10-19 1964-02-11 Polymers Inc Unoriented polyolefin filaments
FR1449751A (fr) * 1964-06-22 1966-05-06 Snia Viscosa Procédé et dispositifs pour la production de filés synthétiques de section asymétrique
US3499958A (en) * 1965-11-08 1970-03-10 Rhodiaceta Process for obtaining x-shaped filaments
US3405424A (en) * 1966-10-27 1968-10-15 Inventa Ag Device and process for the manufacture of hollow synthetic fibers

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3981948A (en) * 1975-01-02 1976-09-21 Eastman Kodak Company Arrangements in spinnerets of spinning orifices having significant kneeing potential
US4142850A (en) * 1975-01-02 1979-03-06 Eastman Kodak Company Non-kneeing spinning orifices for spinnerets
US4473386A (en) * 1983-07-21 1984-09-25 Strickland Edward T Method and apparatus for fiber production from heat softenable material
US5057368A (en) * 1989-12-21 1991-10-15 Allied-Signal Filaments having trilobal or quadrilobal cross-sections
US20060012072A1 (en) * 2004-07-16 2006-01-19 Hagewood John F Forming shaped fiber fabrics
EP2427600A1 (en) * 2009-05-06 2012-03-14 Saltex OY Pile yarn filament for artificial turf, artificial turf, and method for making pile yarn filament
EP2427600A4 (en) * 2009-05-06 2012-10-31 Saltex Oy POLAR PATTERN FOR ARTIFICIAL GRASS, ARTIFICIAL GRASS AND METHOD FOR PRODUCING A POLAR PATTERN
WO2021135083A1 (zh) * 2019-12-29 2021-07-08 江苏恒力化纤股份有限公司 一种仿棉聚酯纤维及其制备方法
JP2022552443A (ja) * 2019-12-29 2022-12-15 江蘇恒力化繊股▲ふん▼有限公司 擬綿化ポリエステル繊維及びその製造方法

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Publication number Publication date
GB1267330A (en) 1972-03-15
ZA694224B (en) 1971-01-27
CA935608A (en) 1973-10-23
DE1930941A1 (de) 1970-01-22
BR6909991D0 (pt) 1973-01-09
GB1266182A (xx) 1972-03-08

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