US3853687A - Modified synthetic fibers and a process for the manufacture of same - Google Patents

Modified synthetic fibers and a process for the manufacture of same Download PDF

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Publication number
US3853687A
US3853687A US00212044A US21204471A US3853687A US 3853687 A US3853687 A US 3853687A US 00212044 A US00212044 A US 00212044A US 21204471 A US21204471 A US 21204471A US 3853687 A US3853687 A US 3853687A
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Prior art keywords
fiber
sheath
undulations
core
extruded
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Expired - Lifetime
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US00212044A
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English (en)
Inventor
T Ishikawa
T Kusunose
M Sakashita
A Okamoto
K Yamashita
N Okubo
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Asahi Kasei Corp
Asahi Chemical Industry Co Ltd
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Asahi Chemical Industry Co Ltd
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Priority claimed from JP11665870A external-priority patent/JPS5322168B1/ja
Priority claimed from JP11665770A external-priority patent/JPS5322167B1/ja
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    • A—HUMAN NECESSITIES
    • A46—BRUSHWARE
    • A46D—MANUFACTURE OF BRUSHES
    • A46D1/00—Bristles; Selection of materials for bristles
    • A46D1/02—Bristles details
    • A46D1/023—Bristles with at least a core and at least a partial sheath
    • A—HUMAN NECESSITIES
    • A46—BRUSHWARE
    • A46D—MANUFACTURE OF BRUSHES
    • A46D1/00—Bristles; Selection of materials for bristles
    • 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
    • D01D5/28—Formation of filaments, threads, or the like while mixing different spinning solutions or melts during the spinning operation; Spinnerette packs therefor
    • D01D5/30—Conjugate filaments; Spinnerette packs therefor
    • D01D5/34—Core-skin 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
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/29—Coated or structually defined flake, particle, cell, strand, strand portion, rod, filament, macroscopic fiber or mass thereof
    • Y10T428/2913—Rod, strand, filament or fiber
    • Y10T428/2929—Bicomponent, conjugate, composite or collateral fibers or filaments [i.e., coextruded sheath-core or side-by-side type]
    • 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
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/29—Coated or structually defined flake, particle, cell, strand, strand portion, rod, filament, macroscopic fiber or mass thereof
    • Y10T428/2913—Rod, strand, filament or fiber
    • Y10T428/2933—Coated or with bond, impregnation or core
    • Y10T428/2935—Discontinuous or tubular or cellular core
    • 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
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/29—Coated or structually defined flake, particle, cell, strand, strand portion, rod, filament, macroscopic fiber or mass thereof
    • Y10T428/2913—Rod, strand, filament or fiber
    • Y10T428/2973—Particular cross section
    • Y10T428/2975—Tubular or cellular

Definitions

  • ABSTRACT Synthetic fibers capable of absorbing aqueous medium are manufactured by simultaneously extruding the fiber material and a second material in a core and sheath arrangement. Turbulence is produced in the zone where these two materials combine which results in undulations in their cross-sections.
  • the second material is then dissolved away with a solvent to leave a fiber with an undulating surface.
  • the fiber is hollow with undulations on the inside while when the second material is extruded as the sheath the solid fiber has an undulating outer surface.
  • the synthetic fiber has, generally speaking only a poor aqua-absorbing power.
  • nylon fibers may pick up aqueous medium in the order of only 7 8 percent of their own weight and thus underwears made from such fibers as nylon can pick up only a small amount of sweat from the wearer who suffers thus from his unpleasant and unsanitary feelings during his or her wearing period.
  • This drawback is fatal to this kind of fibers and constitutes an appreciable braking factor to a more broad and accelerated use of these fibers, as is well known among both skilled and unskilled persons.
  • the synthetic fibers have generally appreciable waxy looks and feelings, as is highly well known.
  • Regenerated fibers such as rayon fibers are rather superior over the synthetic fibers in this respect, but they are defective in such that the spinning velocity for these regenerated fibers amounts only to one several of that for the representative synthetic fibers such as nylon. Therefore, it is a general tendency that the regenerated fibers are gradually overwhelmed by the synthetic fibers.
  • foam yarns have'already proposed.
  • These improved fibers are manufactured in such a way that a proper foaming agent such as sodium hydrogencarbonate, ammonium carbonate, amyl acetate, butyl acetate or diazoaminobenzene is admixed before spinning to the spinning material and the thus modified material is extruded from a spinneret.
  • a proper foaming agent such as sodium hydrogencarbonate, ammonium carbonate, amyl acetate, butyl acetate or diazoaminobenzene is admixed before spinning to the spinning material and the thus modified material is extruded from a spinneret.
  • the aqueous pick-up rate of the synthetic fiber can be substantially improved, in addition to the simultaneous reduction of the defective waxy feelings by forming an infinitely large number of finely distributed random depressions on the surface of the fiber.
  • fine gas-filled cells are formed within the whole material of the fiber, thereby the tensile strength thereof being naturally and defectively reduced.
  • the main object ofthe present invention is to provide a synthetic fiber devoid of the aforementioned various conventional drawbacks inherent in the synthetic fibers, and a process for the manufacture of same.
  • a further object is to provide an improved and modified synthetic fiber having a silk-like glaze and feeling, and a process for the manufacture of same.
  • conventional foam fibers can satisfy substantially the last-mentioned object of the invention.
  • a substantially fine yarn less than i 50 denier by way of example, frequent yarn breakage could be encountered.
  • a still finer yarn for instance 5 denier or less, can not be produced by the conventional foam yarn technique without fear of frequent yarn breakage.
  • the improved and modified synthetic fiber according to this invention has at an outer or inner surface thereofa specific undulated cross-sectional configuration similar to that which is owned by the regular and conventional layon, These undulations are formed and arranged on the inside or outside surface of the fiber, as the case may be, in randon manner when seen in the longitudinal axis of the fiber. Excepting the case ofa hollow filament, the synthetic fiber according to this invention has on any cross-section thereof, no cellular structure in the filled-in and even body material of the fiber. The undulations or.recesses are found on the outer or inner surface of the fiber.
  • the manufacturing material for the improved and modified synthetic fiber according to this invention may be that any of known polymer or copolymer which has a fiber-forming ability. Representative thereof, and in nonslirnitative sense, it may be of the origin of polyamide, polyester, polyolefine, polyvinylchloride or polyacrylonitrile.
  • Applicable polyamides may include lactams, linear high polymers as obtainable from. diamine and dicarboxylic acid, as being enumerated: nylon 6, nylon 66, nylon 12 nylon 610, nylon 612 and the like which may be Georgiadas polyamide per se andits copolymer.
  • Applicable polyesters may be, by way of example, polyeth ylene terephthalate,,polyethylene isophthalate and the like which may be grouped in polyester per se and its copolymer with adipic acid, 2-dodecanoic acid, butan diol, polyethylene glycol and the like, said polyesters per se being such linear high polymers asobtainable by condensating reaction between diol and dicarboxylic acid and lactoor hydroxybenzoic acid.
  • the irregular undulations may be provided on theinside of' .generally different configurations and different circum pherential positions at different cross-sections of the fiber. These communication passages .have therefore only short axial distances, thus providing no axially ex tended slit or slotform.
  • rayon-like cross-sectional configuration as used throughout this specification and appended claims has such means that the cross-sectional configuration of the fiber according to this invention as viewed on a microscope represents similar surface undulations as those of the rayon filament. However, the undulations in the case of the invention have a rather profound shade. In the case of the rayon filament, there are only simpler convex and concave undulations, thus representing no deeply coved recesses.
  • coved means to express a deep bay' like recess having a smaller inlet distance than that measured at a deeper and wider place of the recess entered further thereinto from the inlet opening portion thereof.
  • the cross-sectional configuration of the fiber according to this invention represents rather normally such deeply coved recesses.
  • the convexed parts of the undurations as observed on the outer or inner surface of the fiber according to this invention are rather steeper than those appearing on rayon filaments may take frequently pleat-like forms.
  • the undulations on the fiber according to this invention have generally substantially longer radical lengths, thus having high convex undulations and deeper concave undulations than those on the rayon filaments.
  • the undulations are generally still shorter and shallower than those of the rayon filaments,
  • the former representing rather shallow crater-like configurations as having formed by the escapement of a gaseous foaming agent.
  • novel and peculiar shape and arrangement of the undulations on the fiber according to this invention have a very important role for the fulfilment of the objects' of the invention, especially for the realization of an incredibly increased pick-up ability of human sweat.
  • Other advantages of the invention may also be derived therefrom.
  • non-round crosssectional configuration may be realized by extruding the spinning material through a nozzle having a crosssectioned orifice.
  • all the cross-sectional configurations must be same at every sections and the fiber represents longitudinally extended ridges and valleys which are naturally very different in their overall configuration, arrangement and effects, from the undulations formed in accordance with the inventive technique.
  • two different kinds of spinning materials of which the one is capable of being dissolved by contact with a specifically selected solvent are extruded through a spinneret designed and arranged to produce sheath-core type conjugate composite fiber, yet having a turbulence-providing zone, preferably made of a mass of flow-disturbing particles or the like solid members held in position within each of the extrusion orifices of the spinneret, so as to provide modified conjugate fibers, each having complexedly shaped and arranged undulations on and along the conjugating surface between the two different spinning materials now having been conjugated with each other.
  • the thus provided conjugate fibers are treated with the solvent above referred to, so as to dissolvingly remove the sheath component or the core component, as the case may be, which has affinity with the solvent.
  • the core component does constitute the physically modified fiber according to this invention so that it is solid or in fullness overall its cross-section and the complexed undulations appear on the outer surface of the fiber.
  • the fiber when the core component has been dissolved out, the fiber will take the form of a hollow fiber which represents the undulations on its inside surface.
  • the intrinsic viscosity of the spinning material may preferably be about 0.8 2.0 for polyamide; and 0.6 1.5 for polyester.
  • the volumetric ratio between sheath and core may preferably be 1 5 5 1.
  • the tubulence-providing and flowresisting material held in position within the extrusion orifice may be sand particles passed through a filter net of 20 100 mesh; bearing balls of 0.1 2.0 mm dia.; a wire net of 400 mesh; steel balls, l e 2 mm dia. prepared from 0.] l.0 mm 4), stainless steel rod upon cut in lengths; or pervious and resilient resin or the like mass having flow passages, preferably 0.1 0.5 mm dia. or width, as the case may be.
  • the temperature of the spinneret may be set to a properly selected one between the softening point and the decomposing point of ether of the two different conjugating materials. Practically, however, it extends between about 200 and 350C.
  • the treating agent for dissolving one of the conjugated components sulfuric acid, hydrochloric acid, formic acid, phenol, solution of calcium chloride in methanol or the like, for polyamide.
  • Metacresol, aqueous caustic soda solution or the like may preferably be used for polyester.
  • Benzene, xylene, toluene, tetraline or the like may preferably be used for polyolefine.
  • the concentration of solvent may be set to l percent, as occasion may desire.
  • the treating period may preferably extend for 0.5 second minutes.
  • the fibers according to this invention have a specific non-waxy, linen-like hand-feeling and an remarkably improved liquid-absorbing power, at least several or five times, and frequently even ten and several times over conventional nylon filaments as an example, without fear of appreciable loss of fiber strength.
  • Dyestuff affinity and heat-preserving power can be accordingly increased.
  • FIG. 1 is a partial and sectional view of a spinneret used for the manufacture of a conjugate fiber as an intermediate product in the manufacturing process.
  • FIG. 2 is a sectional plan view taken substantially along a section line lI-II' shown in FIG. 1.
  • FIG. 3 is a schematic cross-sectional view of the intermediate conjugate composite fiber to be used for the manufacture of the inventive fiber.
  • FIGS. 4 and 5 are two different cross-sections of different inventive filaments which have been prepared from the same intermediate product shown in FIG. 3.
  • ' meral 1 represents an upper nozzle plate; 2 an intermediate nozzle plate and 3 a bottom nozzle plate assembled together fixedly as shown and housed in a cupshaped nozzle holder 11 only partially shown.
  • Upper nozzle plate I is formed with a plurality of first passage openings 4 which are arranged radially on an imaginary circle around the center of the spinneret, although the detaileds have been omitted from the drawing only for simplicity, said first openings 4 being adapted for reception of a first kind of fused polymer for forming the core of the conjugate fiber, as will become more fully as the description proceeds.
  • Second passage openings 7 are also formed through the upper or top nozzle plate I and arranged concentrically around the center of the spinneret, although the details have been omitted only for simplicity. These second openings 7 are for the purpose of introducing a second kind of fused spinning material adapted for forming the sheath of the conjugate fiber shown in FIG. 3.
  • each of said first passage opening 4 there is provided a passage opening 12 bored through the intermediate nozzle plate 2, a circular and raised shoulder 13 is formed concentrically around each of the passage openings 12, although only one is shown as a representative.
  • the bottom part of each of these openings 12 is enlarged, so as to receive a wire net 6 in position and for preventing a mass of granular or particle-shaped members, preferably sand particles, bearing balls or the like members as was briefly referred to hereinbefore, so as to provide a turbulence-providing and flow-restricting zone 5 held within the interior space of each of said passage openings 12.
  • each of the passage opening 12 there is provided a nozzle orifice having a gradually reducing mode and in concentric arrangement with the intermediate passage opening I2 and bored through the bottom nozzle plate 3.
  • a distributing space 8 On the upper surface and defined between the top and intermediate plates 1; 2, there is provided a distributing space 8 adapted for distributing the second fused conjugating material received from second passage openings 7 into the intermediate passage openings 12, so as to constitute sheaths, as known per se.
  • the first fused material is introduced from a first spinning pump, not shown, to each of the first passage openings 4, thence through a reduced part 9 of space 8, the turbulence-providing zone 5 formed within intermediate passage opening 12, wire net 6 and extrusion orifice 10, in the form of a conjugating core.
  • second fused material is fed from a second spinning pump, not shown, to second passage openings 7, thence through space 8 and its reduced part 9 to each of the said zone 5 and concentrically around the core consisting of the first material.
  • a sheath is formed during passage through the zone 5, so as to provide a sheath-core type conjugate fiber from each of the intermediate passage openings 12.
  • This conjugate fiber is fed further through the ex trusion orifice 10, as commonly known per se.
  • each of the thus extruded conjugate fibers delivered from the orifices 10 does not take a substantially truely shaped circular sheath and core, yet taking the form as illustrated generally at 14 in FIG. 3.
  • This intermediate fiber product formed into a conjugate composite fiber 14 has heavy undulations on and along the conjugating orifice 17 between the sheath 15 and core 16.
  • the core 16 is isolatedly provided which has on its outer surface heavy undulations 17 of the nature substantially similar to that of a rayon filament. The nature'of these undulations has already been disclosed in detail hereinbefore.
  • the sheath 15 having substantially the conjugated shape is isolatedly provided which has on its inside surface heavy undulations 17' of the nature of which has been described hereinbefore.
  • These undulations 17 are, so to speak, a negative impression of the cross-sectional configuration of that ofa rayon filament; yet, however, these undulations can be equally expressed as before to have a cross-sectional configuration similar to that of a rayon filament, because the true relative relation-ship is only in the positive-negative correspondence with each other.
  • the spinneret had thirteen extrusion orifices 10, each having 05 mm d).
  • the zone 5 was constituted by twenty sand particles per extrusion orifice, having passed through a sieve of 20 mesh.
  • the spinneret temperature was set to 300C and the winding speed of the produced conjugate fiber was adjusted to 1,000 m/min.
  • the thus formed and unstretched yarn was stretched as conventionally to its 30-times length into a 50 d/l3 fils., polyamide/polyester, sheath-core conjugate yarn which was then treated with an aqueous caustic soda solution for dissolving out the core component.
  • a hollow yarn as shown in FIG. 5 was obtained, representing random and heavy undulating inside surface 17.
  • the dissolvingly treating conditions were:
  • core-dissolving bath aqueous ZO'k-caustic soda solution
  • bath ratio I 20; bath temp. C; treating period: 30 minutes.
  • EXAMPLE 2 treating hath Wt-aqueous NaOH solution; bath temp. 90C; treating period 2 sec. curing 180C for 10 seconds.
  • Sweat-absorbing capability was about eight times that of conventional comparative plain nylon multifilament. Appearance and feeling were silky and lincnlike, respectively.
  • EXAMPLE 3 Polystyrene, having a molecular weight of 200.000. and polyhexamethyleneadipamide dissolved in 95 percent-sulfuric acid and having a relative viscosity 2.5 and intrinsic viscosity: 1.2, were fused separately and fed from respective spinning pumps to the spinneret shown in FIGS. 1 2 and in the vol. ratio of l 3. The extrusion orifices were 130 in number, each having 0.5 mm (b. Polystyrene was used for the sheath and polyhexamethyleneadipamide was utilized for the core.
  • the zone 5 was filled with 12 sand particles of 30 mesh.
  • Temperature of spinneret was set to 280C and the winding speed was adjusted to 200 m/min.
  • the unstretched conjugate yarns were stretched to about 2.7-times length, and the stretched filaments were 480 d/12O fils.
  • conjugate fibers were treated with benzene, so as to dissolve the sheaths.
  • the resulted yarns were as shown in FIG. 4, as a representative.
  • Sweat-absorbing capability was about nine-times in comparison with those of conventional comparative plain nylon uarns. Appearance was silky and hand feeling was linen-like.
  • Sheath-dissolving treating conditions were:
  • EXAMPLE 4 e-caprolactam/hexamethylene diadipate copolymerized in wt. ratio of 3 7 and dissolved in percentsulfuric acid and having a relative viscosity of 2.6 (intrinsic viscosity 1.2), and polyethyleneterephthalate, [17] :0.70, were fused separately and fed at a vol. ratio, '1 2 from respective spinning pumps to the spinneret, having a similar structure as shown by way example in FIGS. 1 and 2, said spinneret having ten extrusion orifices, each being ofO.25 mm 4), so as to provide sheathcore conjugate yarns.
  • Polyamide copolymer was used for sheath, while polyethyleneterephthalate was utilized for the core.
  • the zone 5 shown in FIGS. l- 2 was filled with eight ball-like members, 1.5 mm 11), made from a length of stainless steel rod, 10 cm long, 0.5 mm 1).
  • Temperature of spinneret was set to 275C and the winding-up speed was set to 600 m/min.
  • the unstretched conjugate yarns were stretched to 3.2-time lengths, to provide yarns of d/l0 fils.
  • Sweat absorption was nine-times as that of conventional comparative plain nylon multifilaments. Appearance was silky and hand feeling was linen-like.
  • a synthetic fiber comprising a core portion and a sheath portion with an interface between said core and said sheath which is characterized by extruded extreme irregular undulations which vary in cross-section along the entire length of the fiber, wherein said core has been removed, leaving a hollow sheath with said extreme irregular undulations on the internal surface thereof.
  • An indefinite length synthetic fiber having a cen- I tral hollow portion along its longitudinal axis and extruded irregular undulations on the internal surface thereof, said extruded irregular undulations varying in cross-section along the entire length of the fiber.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Multicomponent Fibers (AREA)
  • Spinning Methods And Devices For Manufacturing Artificial Fibers (AREA)
US00212044A 1970-12-24 1971-12-27 Modified synthetic fibers and a process for the manufacture of same Expired - Lifetime US3853687A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP11665870A JPS5322168B1 (enExample) 1970-12-24 1970-12-24
JP11665770A JPS5322167B1 (enExample) 1970-12-24 1970-12-24

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US00212044A Expired - Lifetime US3853687A (en) 1970-12-24 1971-12-27 Modified synthetic fibers and a process for the manufacture of same
US05/642,027 Expired - Lifetime US4085174A (en) 1970-12-24 1975-12-18 Process for spinning modified synthetic fibers

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US05/642,027 Expired - Lifetime US4085174A (en) 1970-12-24 1975-12-18 Process for spinning modified synthetic fibers

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US (2) US3853687A (enExample)
CA (1) CA986672A (enExample)
DE (1) DE2164422A1 (enExample)
FR (1) FR2119731A5 (enExample)
GB (1) GB1381882A (enExample)
IT (1) IT945598B (enExample)
NL (1) NL7117785A (enExample)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4288494A (en) * 1979-03-12 1981-09-08 Extracorporeal Medical Specialites, Inc. Non-uniform cross-sectional area hollow fibers
US5690823A (en) * 1992-11-09 1997-11-25 Reipur; John Filtration medium
US20040197557A1 (en) * 2003-03-27 2004-10-07 Eshraghi Ray R Process for manufacturing hollow fibers
US20080108265A1 (en) * 2006-11-03 2008-05-08 Behnam Pourdeyhimi High surface area fiber and textiles made from the same
US20130237109A1 (en) * 2007-12-19 2013-09-12 Tempnology, Llc Fabric with cooling characteristics
US9284663B2 (en) 2013-01-22 2016-03-15 Allasso Industries, Inc. Articles containing woven or non-woven ultra-high surface area macro polymeric fibers
US20190106813A1 (en) * 2018-09-20 2019-04-11 Kam Cheung Koo Invention of the hollow stretch yarn
US11326278B2 (en) 2018-09-20 2022-05-10 Kam Cheung Koo Fabric constructions with hollow structures

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US4296175A (en) * 1979-02-21 1981-10-20 American Cyanamid Company Hollow acrylonitrile polymer fiber
DE3040971A1 (de) * 1980-10-30 1982-06-24 Bayer Ag, 5090 Leverkusen Trockengesponnene polyacrylnitrilhohlfasern und -faeden und ein verfahren zu ihrer herstellung
US4515859A (en) * 1982-09-16 1985-05-07 American Cyanamid Company Hydrophilic, water-absorbing acrylonitrile polymer fiber
US4439487A (en) * 1982-12-17 1984-03-27 E. I. Du Pont De Nemours & Company Polyester/nylon bicomponent flament
US4744932A (en) * 1985-05-31 1988-05-17 Celanese Corporation Process for forming a skinless hollow fiber of a cellulose ester
US4681721A (en) * 1985-11-06 1987-07-21 Mobil Oil Corporation Thermoplastic film extrusion process employing die with filtering arrangement
EP0330766B1 (en) * 1988-02-29 1993-06-02 Toray Industries, Inc. Multi-layered conjugated acrylic fibers and the method for their production

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US3323168A (en) * 1962-05-24 1967-06-06 American Enka Corp Spinneret for spinning hollow filaments
US3325845A (en) * 1965-02-26 1967-06-20 Int Playtex Corp Nylon bristle resembling natural bristle
US3671381A (en) * 1967-02-17 1972-06-20 Du Pont Etched and ridged polyamide monofilament
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US2862284A (en) * 1953-05-04 1958-12-02 Sol B Wiczer Modified filament and method
US3323168A (en) * 1962-05-24 1967-06-06 American Enka Corp Spinneret for spinning hollow filaments
US3325845A (en) * 1965-02-26 1967-06-20 Int Playtex Corp Nylon bristle resembling natural bristle
US3700544A (en) * 1965-07-29 1972-10-24 Kanegafuchi Spinning Co Ltd Composite sheath-core filaments having improved flexural rigidity
US3671381A (en) * 1967-02-17 1972-06-20 Du Pont Etched and ridged polyamide monofilament

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4288494A (en) * 1979-03-12 1981-09-08 Extracorporeal Medical Specialites, Inc. Non-uniform cross-sectional area hollow fibers
US5690823A (en) * 1992-11-09 1997-11-25 Reipur; John Filtration medium
US20040197557A1 (en) * 2003-03-27 2004-10-07 Eshraghi Ray R Process for manufacturing hollow fibers
US20080108265A1 (en) * 2006-11-03 2008-05-08 Behnam Pourdeyhimi High surface area fiber and textiles made from the same
US8129019B2 (en) * 2006-11-03 2012-03-06 Behnam Pourdeyhimi High surface area fiber and textiles made from the same
US20130237109A1 (en) * 2007-12-19 2013-09-12 Tempnology, Llc Fabric with cooling characteristics
US9284663B2 (en) 2013-01-22 2016-03-15 Allasso Industries, Inc. Articles containing woven or non-woven ultra-high surface area macro polymeric fibers
US20190106813A1 (en) * 2018-09-20 2019-04-11 Kam Cheung Koo Invention of the hollow stretch yarn
US11326278B2 (en) 2018-09-20 2022-05-10 Kam Cheung Koo Fabric constructions with hollow structures

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GB1381882A (en) 1975-01-29
IT945598B (it) 1973-05-10
US4085174A (en) 1978-04-18
FR2119731A5 (enExample) 1972-08-04
CA986672A (en) 1976-04-06
NL7117785A (enExample) 1972-06-27
DE2164422A1 (de) 1972-07-13

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