WO2015075658A1 - Collecte et manipulation de fibres électrofilées - Google Patents

Collecte et manipulation de fibres électrofilées Download PDF

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Publication number
WO2015075658A1
WO2015075658A1 PCT/IB2014/066191 IB2014066191W WO2015075658A1 WO 2015075658 A1 WO2015075658 A1 WO 2015075658A1 IB 2014066191 W IB2014066191 W IB 2014066191W WO 2015075658 A1 WO2015075658 A1 WO 2015075658A1
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WO
WIPO (PCT)
Prior art keywords
fibres
counter electrodes
collector
array
parallel
Prior art date
Application number
PCT/IB2014/066191
Other languages
English (en)
Inventor
Anton Eugene Smit
Haydn KRIEL
Original Assignee
The Stellenbosch Nanofiber Company (Pty) Limited
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 The Stellenbosch Nanofiber Company (Pty) Limited filed Critical The Stellenbosch Nanofiber Company (Pty) Limited
Publication of WO2015075658A1 publication Critical patent/WO2015075658A1/fr

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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
    • D01D5/0007—Electro-spinning
    • D01D5/0061—Electro-spinning characterised by the electro-spinning apparatus
    • D01D5/0076—Electro-spinning characterised by the electro-spinning apparatus characterised by the collecting device, e.g. drum, wheel, endless belt, plate or grid
    • D—TEXTILES; PAPER
    • D02—YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING
    • D02G—CRIMPING OR CURLING FIBRES, FILAMENTS, THREADS, OR YARNS; YARNS OR THREADS
    • D02G3/00—Yarns or threads, e.g. fancy yarns; Processes or apparatus for the production thereof, not otherwise provided for
    • D—TEXTILES; PAPER
    • D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B2321/00—Fibres made from polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • D10B2321/10—Fibres made from polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds polymers of unsaturated nitriles, e.g. polyacrylonitrile, polyvinylidene cyanide

Definitions

  • This invention relates to electrospun fibre collection and handling and, more particularly, to the collection and handling of fine electrospun fibres such as those commonly termed nano fibres and typically having diameters in the range of from 5 nm (nanometres) to several micrometres.
  • the fibres are generally very fine fibres electrospun from various polymers, polymer blends, ceramic precursor mixtures and metal precursor mixtures.
  • a sufficiently strong electric field typically up to 10 kV/cm
  • a suitable liquid that may be a polymer solution or molten polymer
  • the electrostatic forces can overcome the surface tension of the liquid and a jet of polymer solution or melt is ejected from the liquid.
  • the electric field is typically applied between a high-voltage source electrode that may take numerous different forms and a counter electrode that may also take numerous different forms. Electrostatic instability leads to rapid, chaotic whipping of a jet, leading, in turn, to fast evaporation of the solvent as well as a stretching and thinning of the residual polymer fibre.
  • the formed fibres are usually quite uniform and can have fibre diameters of several micrometers, down to as low as 5 nm, although more commonly from about 50 to about 1000 nm.
  • the lengths of the fibres depend to a large extent on the liquid that is being spun; the equipment being used for spinning process; and the process conditions. In the absence of any additional control measures they are collected on a counter electrode in the form of a random nonwoven web.
  • electrospun fibres in such diverse fields as high-performance filters, absorbent textiles, fibre reinforced composites, biomedical textiles for wound dressings and post-operative adhesion prevention agents, tissue engineering scaffolding and drug-release materials, nano- and microelectronic devices, electromagnetic shielding, photovoltaic devices and high- performance electrodes, a range of nano-fibre based sensors, electrodes for batteries and fuel cells, catalyst support materials, wiping cloths, absorbent pads, smart-textiles as well as in artificial cashmere and artificial leather.
  • the complete fabric can even be made from nano-fibre yarns. This has important implications in protective clothing applications, where lightweight, breathable fabrics with protection against extreme temperatures, ballistics, and chemical or biological agents are often required.
  • nano-fibre textiles may exhibit extremely soft handling characteristics and have been proposed for use in the production of artificial leather and artificial cashmere.
  • the length of the fibres it is highly advantageous for the length of the fibres to extend in the general direction of the length of the yarn so that enhanced tensile strength may be achieved. Fibre arrays that do not possess such orientation prior to yarn forming processes will have reduced drawability and the resultant yarns will have inferior mechanical properties.
  • Applicant's own published international patent application WO2008062264 describes another arrangement of counter electrodes in which the fibres are formed in generally parallel relationship to each other with folds at positions along the length thereof that correspond to spacings between transverse conductive strips on a belt.
  • apparatus for collecting and handling formed electrospun fibres, wherein the apparatus includes a set of parallel counter electrodes in the form of generally parallel travelling counter electrodes that are spaced apart and serve as a primary collector for continuously receiving generally parallel spun fibres emanating from an electrically charged electrospinning apparatus such that the fibres extend transversely between the travelling counter electrodes and span a gap between them, the apparatus being characterised in that it includes a fibre collection arrangement comprising an endless movable transport surface serving as a secondary collector and having a direction of movement generally parallel to the direction in which the spun fibres extend between the parallel counter electrodes, and a transfer arrangement for transferring spun fibres extending between the counter electrodes of the primary collector onto the moving surface of the secondary collector in a continuous aligned array of fibres in which the fibres extend generally lengthwise in the array and wherein the array is suitable for feeding to a yarn forming unit.
  • the transfer arrangement may be one in which the endless movable transport surface serving as the secondary collector extends into the gap near an end towards which the counter electrodes of the primary collector move so that the secondary collector collects the spun fibres on its surface directly.
  • the apparatus includes an arrangement for collecting fibres in a gap between corresponding ends of a pair of counter electrodes in the form of endless parallel belts of a primary collector and the endless movable transport surface of the secondary collector is that of a rotatable cylinder, roller or endless belt that has a cylindrical surface that extends across the width of the counter electrode belts of the primary collector and an axis that is parallel to rollers defining the adjacent ends of the parallel counter electrode belts of the primary collector.
  • the cylindrical surface of the cylinder, roller or endless belt of the secondary collector projects into the gap between adjacent ends of the parallel counter electrode belts of the primary collector to remove the fibres in a direction that is generally tangential with respect to the cylinder, roller or endless belt so that an array of fibres in the form of a generally elongate planar layer is formed wherein the length of the individual fibres extends in the general direction of the length of the array.
  • cutters can be provided across the width of the planar layer for cutting the generally planar layer into a plurality of strips with each strip being individually associated with a yarn forming unit for forming the array strip into a yarn.
  • the fibres in each strip will extend generally in the direction of the length of the strip.
  • the apparatus may be of a larger configuration in which instance the parallel travelling counter electrodes of the primary collector number two or more wherein each is in the form of an endless conductive electrode in the form of a wire or the like passing around coaxial pulleys at each end so that a plurality of gaps is formed between adjacent counter electrodes in a single plane.
  • the endless movable transport surface of the secondary collector is that of a sinuous collection belt having projecting regions that extend into an adjacent end region of each gap between adjacent pairs of travelling counter electrodes of the primary collector so that as the collection belt progresses in its travelling movement from one such gap successively to the next it collects fibres from a first gap followed by those from a second and subsequent gaps across the width of the arrangement of parallel travelling counter electrodes.
  • the collection belt preferably extends into the gap to a position past where the wires of the travelling counter electrodes of the primary collector meet their supporting pulleys.
  • the gaps across the width of the arrangement of parallel travelling counter electrodes of the primary collector may differ to simultaneously accommodate collection of different types of materials and blending them together into the same yarn.
  • the fibres become generally aligned with the direction of travel of the sinuous collection belt so that an array of fibres is formed with the individual fibres extending in the longitudinal direction of the array that may then be fed to a yarn forming unit.
  • the transfer arrangement includes a plurality of nozzles arranged to cause air jets to blow generally aligned fibres onto a continuous secondary collector belt that runs cross-wise relative to the wires of the primary collector so as to collect said continuous aligned array of fibres in which the fibres extend generally lengthwise in the array.
  • the invention also provides a method for forming continuous sheets or elongate arrays of highly aligned electrospun fibers comprising collecting fibres in apparatus as defined above to form an elongate array of fibres in which individual fibres have their length extending in the general direction of the elongate array thereof.
  • the transfer of the aligned fibres from the primary collector to the secondary collector assembly happens by purely mechanical force and so the secondary collector can be made of any suitable material that imparts the correct surface properties that facilitate transfer of the fibres from the primary collector and also release of the aligned fibre arrays from the secondary collector surface in order to feed these arrays into a yarn forming unit. This potentially simplifies design of the apparatus, since the necessary precautions used with high-voltage components don't necessarily apply to the secondary collector.
  • FIG. 1 is a schematic illustration of the basic operation of the invention
  • Figure 2 is a schematic elevation of one embodiment of the first variation of the invention.
  • FIG. 3 is a schematic side elevation of the embodiment of the invention illustrated in
  • Figure 4 is a schematic side elevation of one embodiment of the second variation of the invention.
  • Figure 5 is a plan view of the embodiment of the second variation of the invention illustrated in Figure 4.
  • Figure 6 is a schematic side elevation of an embodiment of the second variation of the invention illustrated in Figure 4 with a modification that the endless movable transport surface is angled relative to the direction of travel of the endless counter electrodes;
  • Figure 7 is a scanning electron micrograph of the resultant polyacrylonitrile yarn at one resolution
  • Figure 8 is a scanning electron micrograph of the resultant polyacrylonitrile yarn at a much greater resolution
  • Figure 9 is a schematic isometric illustration of one implementation of the second variation of the invention.
  • Figure 10 is a schematic end view of what is illustrated in Figure 9 taken in the direction of arrow "A".
  • fibers are electrospun from a spinning source (A) onto a pair of spaced counter electrodes constituting a primary collector (B), and the aligned fibers (C) in the form of an aligned fiber array are then physically collected from that primary collector onto an endless movable transport surface forming a secondary collector (D).
  • the secondary collector continually collects the aligned fibers from the primary collector and forms them into an array or sheet of aligned fibers.
  • FIGS 2 and 3 of the accompanying drawings illustrate schematically an embodiment of the first implementation of the first variation of the invention in which the electrospinning apparatus includes an arrangement of spinnerets or liquid coated electrode surfaces (1 ) that are adapted to be electrically charged at an appropriate voltage for electrospinning purposes so as to create an electric field required for electrospinning with counter electrodes, that are charged at a potential opposite to the spinnerets, in the form of a pair of electrically conductive endless parallel belts (2) that form the primary collector in this instance.
  • the arrangement is such that fibres are spun into a gap between corresponding end regions (3) of the pair of belts.
  • the exact nature of the high voltage source electrodes is not of specific relevance to the present invention and any suitable high-voltage electrospinning source electrode arrangement may be employed.
  • the counter electrodes constituting the primary collector could be at a ground potential but this is not necessarily so and a different arrangement may be employed in order to create the required potential difference.
  • an endless movable transport surface is that of a rotatable cylinder (4) or an endless belt that forms the secondary collector wherein the cylindrical surface extends across the width of the counter electrode belts of the primary collector with the axis of the cylinder being parallel to rollers (5) defining the adjacent ends (6) of the parallel belts.
  • the cylindrical surface of the cylinder or belt of the secondary collector thus projects somewhat into the gap (7) between the adjacent ends of the parallel counter electrode belts remote from the electrospinning apparatus to an extent that is sufficient to enable it to collect the fibres (8) that bridge the gap between the parallel counter electrode belts of the primary collector.
  • the cylindrical surface of the secondary collector serves to remove the fibres in a direction that extends generally along the length of the fibres and that is generally tangential with respect to the cylindrical surface of the cylinder or belt so that an array of fibres in the form of a generally planar layer (1 1 ) is formed with the fibres extending along the length of the planar layer.
  • an electrospinning apparatus is used to form fibres from a solution or melt of a selected material in well-known manner. With the parallel belts of the primary collector moving in unison, numerous electrospun fibres (8) are formed that extend at generally right angles between the two facing surfaces of the two parallel counter electrode belts of the primary collector that are moving in unison in the same direction away from the electrospinning apparatus itself.
  • the diameter of the fibres is commonly from about 50 to about 1000 nm.
  • the lengths of the fibres that extend from the one parallel counter electrode belt to the other will depend on the distance between the parallel counter electrode belts that in turn will depend to some extent on the liquid being spun; the equipment being used for the spinning process; and the process conditions.
  • the sizes of the gaps between the electrode belts, and thereby the fibre lengths may vary from about 3 to about 300 mm and are typically within the range of from about 5 to about 100 mm, and commonly about 10 to 30 mm.
  • the resultant planar layer, depending on its width, may be split into a plurality of strips (12) by suitable cutters (13) and the individual strips can be fed to yarn forming units (14).
  • the electrospinning apparatus (21 ) may be of a larger configuration such as a rectangular configuration in which multiple rows of spinnerets or liquid coated electrodes are provided.
  • the electrospinning apparatus therefore has considerably greater width and is able to spin substantially larger numbers of fibres.
  • the parallel travelling counter electrodes of the primary collector may number more than two in which instance the travelling counter electrodes are each in the form of an endless conductive electrode typically in the general form of electrically conductive wires (22) passing around coaxial pulleys (23) at each end.
  • These coaxial pulleys on a common axis may be uniformly spaced apart relative to each other by some dimension wide enough to allow the sinuous belt to pass around or between them without making contact with the aligned fibre arrays.
  • a plurality of gaps (24) is thus formed between adjacent counter electrode wires. In this particular instance there are six of such wires and consequently five gaps between adjacent pairs of wires.
  • Fibres (25) are thus formed between each adjacent pair of counter electrodes forming the primary collector. It will be understood that in this arrangement the co-operating counter electrodes are all located in the same plane as opposed to the instance of two belts facing each other that are located in spaced pi As shown, fibres are formed in all of the gaps between adjacent counter electrode wires.
  • the endless movable transport surface of the secondary collector is that of a sinuous collection belt (26) that passes around or between multiple belt rollers (27) so that the collection belt has projecting regions (28) that extend into an adjacent end region of each gap between adjacent pairs of travelling counter electrode wires of the primary collector.
  • the fibres become generally aligned with the direction of travel of the sinuous collection belt so that an array of fibres is formed with the individual fibres extending in the longitudinal direction of the array.
  • the array may then be fed to a yarn forming unit (29).
  • FIG. 6 of the drawings one embodiment of the second implementation of the first variation of the invention is illustrated and has the projecting regions of the endless movable transport surface (31 ) of the secondary collector extending into the gaps between the parallel wire electrodes (32) of the primary collector at an angle less than 90 degrees relative to the electrodes.
  • This modification is advantageous to reduce the probability that the aligned nanofiber arrays may be removed unnecessarily from frictional contact with wires or pulleys.
  • the dimensions of the sinuous belt, belt pulleys, rollers and also the degree to which the projecting regions extend into the gaps between the counter electrodes may be different for different types of materials.
  • the primary collector is generally in the form of travelling parallel electrically conductive wires (41 ) substantially as described with reference to Figures 4 and 5.
  • the transfer arrangement in this instance includes a plurality of nozzles (42) arranged to cause air jets (43) to blow at generally right angles to the electrically conductive wires to dislodge aligned fibres from the primary collector and transfer them the continuous secondary collector belt (44) that runs cross-wise relative to the wires of the primary collector.
  • the secondary collector belt and thus collects a continuous aligned array (45) of fibres in which the fibres extend generally lengthwise in the array.
  • nanofibres that are envisaged can be processed according to this invention include but are not limited to fibre forming materials such as carbon fibre precursor materials (e.g. polyacrylonitrile), ceramic precursor materials, metal precursor materials, synthetically made polymers, naturally occurring polymers and biodegradable polymers and various blends of the aforementioned. Any additional processing aids or active ingredients, as known to those skilled in the art, could be included into the spin formulations to enhance spinability and/or add functionality and/or aid in the further processing to the resultant fibres and yarns.
  • the adhesion of the fibres to the endless movable transport surface of the secondary collector in either of the variations of the invention mentioned above, the adhesion may be consequent on the physical nature of the transport surface; and/or electrostatic attraction; and/or fibre entanglement, as well as any other applicable attraction or holding force.
  • a polyacrylonitrile fibre precursor solution was prepared by dissolving polyacrylonitrile (Blue Star, Carbon fibre precursor tow) fibres at 10 wt% concentration in dimethyl formamide at 90 degrees Celsius over 2 hours.
  • polyacrylonitrile Blue Star, Carbon fibre precursor tow
  • the electrodes were rotated at 1000 mm/s and a high voltage of -4 kV DC applied.
  • the spinning source was a modification of a configuration described in WO 2009156822.
  • the spinning source comprised two receptacles containing polymer solution within which two freely rotating glass spheres were rotated at between 1 and 2 rpm.
  • the spheres were coated with a thin layer of the polymer solution.
  • the positioning of the receptacles was in a line that was exactly parallel to the gap between the counter electrodes and the spheres were spaced at a distance of 20 cm from each other (distance between the centre of the one sphere to the centre of the other).
  • the motion of the spheres was in the same direction relative to each other and in the opposite direction to the motion of the parallel counter electrodes.
  • a voltage of + 55 kV DC was applied to the polymer solution.
  • the spinning distance between the top of each sphere and the bottom of the parallel wire cables of the primary collector was set to 25 cm and the ambient conditions were 23 °C and 48 % relative humidity.
  • a moderate air flow was created i spinning chamber by fans below the spinning source and via an extraction unit.
  • the electrospun fibres spanned the gap between the parallel electrodes above the electrospinning source, and were continuously carried away with the motion of the parallel counter electrodes of the primary collector. These fibres were intercepted by the sinuous collection belt as the secondary collector with only a single projection region extending into the gap between the parallel electrodes of the primary collector.
  • This belt comprised a glass fibre belt impregnated with polytetrafluoroethylene and had a movement directed by coaxial pulleys or rollers that had an axis perpendicular to the parallel counter electrodes.
  • This sinuous belt projection of the secondary collector extended into the gap between the parallel electrodes of the primary collector, at an angle of 15 degrees relative to the plane defined by the wire electrodes (similar to what is shown in Figure 6) and intercepted spanned fibres before they were able to reach the pulleys at the end region of the primary electrode.
  • the secondary collector sinuous belt generally had a speed of 0.75 m/min.
  • the diameters of the rollers that guided the projecting regions of the moveable transport surface was 5 mm.
  • Multiple overlapping aligned nanofiber arrays were collected into a continuous array of staple fibres that clung to the surface of the secondary collector's sinuous belt.
  • the leading end of the array was continually lifted from the secondary collector sinuous belt surface by light rubbing motion using a fine brush, hand twisted and then immersed into a water trough (the surface tension of the water promotes handling and twisting of the fibres) and subsequently wound up on a bobbin.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Spinning Methods And Devices For Manufacturing Artificial Fibers (AREA)
  • Nonwoven Fabrics (AREA)

Abstract

L'invention concerne un appareil permettant de collecter des fibres électrofilées s'étendant entre des contre-électrodes d'un collecteur primaire sur un collecteur secondaire d'une manière qui aboutit à la formation d'un réseau généralement continu dans lequel les fibres s'étendent généralement dans le sens de la longueur dans le réseau qui peut alors être acheminé dans une unité de formation de fil. L'appareil d'électrofilature comprend un collecteur primaire constitué de deux ou plus de deux contre-électrodes mobiles généralement parallèles qui sont espacées et qui reçoivent continuellement des fibres filées généralement parallèles en provenance d'un appareil d'électrofilature électriquement chargé de sorte que les fibres s'étendent sur un espace entre les contre-électrodes mobiles. Un agencement secondaire de collecte de fibres comporte une surface de transport mobile sans fin située généralement à proximité de l'extrémité vers laquelle les contre-électrodes du collecteur primaire se déplacent de manière à collecter les fibres s'étendant dans le sens longitudinal et les déplacent dans une direction allant à l'opposé du collecteur primaire, les fibres se trouvant dans des réseaux alignés.
PCT/IB2014/066191 2013-11-20 2014-11-20 Collecte et manipulation de fibres électrofilées WO2015075658A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ZA201308646 2013-11-20
ZA2013/08646 2013-11-20

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WO2015075658A1 true WO2015075658A1 (fr) 2015-05-28

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114277470A (zh) * 2021-12-09 2022-04-05 闽江学院 一种转环型静电纺纳米纤维纱线制备装置
WO2023146913A1 (fr) * 2022-01-25 2023-08-03 Rowan University Assemblage d'un fil de nanofibres polymères courtes

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB480950A (en) * 1936-07-28 1938-02-28 Richard Schreiber Gastell Improvements in, or relating to, the production of artificial fibres
US2158415A (en) * 1937-07-28 1939-05-16 Richard Schreiber Gastell Method of producing artificial fibers
WO2006052039A1 (fr) 2004-11-12 2006-05-18 Hak-Yong Kim Procede de preparation d'un filament continu compose de nanofibres
WO2008062264A2 (fr) 2006-11-20 2008-05-29 Stellenbosch University Fil et son procédé de fabrication
EP2045375A1 (fr) 2007-10-02 2009-04-08 Stem Cell Technology Company Appareil et procédé pour l'électrofilature de structures 2D ou 3D de matériaux micro ou nano-fibreux
WO2009101472A2 (fr) 2007-11-02 2009-08-20 National University Of Singapore Endoprothèse revêtue de nanofibres alignées par électrofilature
WO2009156822A1 (fr) 2008-06-24 2009-12-30 Stellenbosch University Procédé et appareil de production de fines fibres
US7828539B1 (en) 2007-03-26 2010-11-09 Clemson University Fabrication of three dimensional aligned nanofiber array
WO2011095141A1 (fr) * 2010-02-05 2011-08-11 Cpn Spol. S.R.O. Appareil pour la production de matériaux fibreux de microfibres et de nanofibres bidimensionnels ou tridimensionnels

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB480950A (en) * 1936-07-28 1938-02-28 Richard Schreiber Gastell Improvements in, or relating to, the production of artificial fibres
US2158415A (en) * 1937-07-28 1939-05-16 Richard Schreiber Gastell Method of producing artificial fibers
WO2006052039A1 (fr) 2004-11-12 2006-05-18 Hak-Yong Kim Procede de preparation d'un filament continu compose de nanofibres
WO2008062264A2 (fr) 2006-11-20 2008-05-29 Stellenbosch University Fil et son procédé de fabrication
US7828539B1 (en) 2007-03-26 2010-11-09 Clemson University Fabrication of three dimensional aligned nanofiber array
EP2045375A1 (fr) 2007-10-02 2009-04-08 Stem Cell Technology Company Appareil et procédé pour l'électrofilature de structures 2D ou 3D de matériaux micro ou nano-fibreux
WO2009101472A2 (fr) 2007-11-02 2009-08-20 National University Of Singapore Endoprothèse revêtue de nanofibres alignées par électrofilature
WO2009156822A1 (fr) 2008-06-24 2009-12-30 Stellenbosch University Procédé et appareil de production de fines fibres
WO2011095141A1 (fr) * 2010-02-05 2011-08-11 Cpn Spol. S.R.O. Appareil pour la production de matériaux fibreux de microfibres et de nanofibres bidimensionnels ou tridimensionnels

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114277470A (zh) * 2021-12-09 2022-04-05 闽江学院 一种转环型静电纺纳米纤维纱线制备装置
CN114277470B (zh) * 2021-12-09 2023-05-05 闽江学院 一种转环型静电纺纳米纤维纱线制备装置
WO2023146913A1 (fr) * 2022-01-25 2023-08-03 Rowan University Assemblage d'un fil de nanofibres polymères courtes

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