CN102703998A - Jet yarn spinning device for electrostatic spun nano fiber and preparing method - Google Patents
Jet yarn spinning device for electrostatic spun nano fiber and preparing method Download PDFInfo
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- CN102703998A CN102703998A CN2012102072503A CN201210207250A CN102703998A CN 102703998 A CN102703998 A CN 102703998A CN 2012102072503 A CN2012102072503 A CN 2012102072503A CN 201210207250 A CN201210207250 A CN 201210207250A CN 102703998 A CN102703998 A CN 102703998A
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Abstract
The invention discloses a jet yarn spinning device for an electrostatic spun nano fiber, which includes a collecting device, wherein two thread jetting devices are arranged on the two sides of the collecting device and connected with a high-voltage electrostatic generator; a buncher is arranged below the collecting device; the two thread jetting devices are arranged between the collecting device and the buncher and symmetrically and oppositely arranged along the axis; a jet nozzle twister is arranged below the buncher; a delivery roller is arranged below the jet nozzle twister; a winding mechanism is arranged below the delivery roller; and the collecting device, the buncher, the jet nozzle twister and the delivery roller are arranged along the same axis from top to bottom. The electrostatic spun nano fiber spinning device integrates thread jetting, collecting, drawing, twisting and winding, and can continuously prepare the electrostatic spun nano fiber yarns. The nano fiber spinning method has simple process, high yarn yield, is suitable for multiple polymer yarn solutions, and realizes the continuous and scaled preparation of the nano fiber yarns.
Description
Technical field
The invention belongs to field of textile machinery, relate to a kind of resultant yarn apparatus and method of electrostatic spinning nano fiber, but be specifically related to the Air-Jet Spinning resultant yarn apparatus and method that a kind of serialization prepares the electrostatic spinning nano fiber yarn.
Background technology
Electrostatic spinning technique is the effective method of preparation nanofiber, and the principle of electrostatic spinning is, under the effect of electrostatic field; The polymer drop that is positioned at spinning head becomes taylor cone; When electrostatic field force surpasses the threshold value of surface tension of liquid, will form good charged jet, and be accelerated, drawing-off, refinement; Form nanofiber after the solvent evaporates, can obtain the nanofiber mats of different shape because of the difference of metal collection unit.Though the electro spinning nano fiber felt can directly apply to many aspects such as filtering material, tissue engineering bracket, useful for drug delivery material, biomimetic material, composite reinforcing material; But for textile industry; Continuous fine nano-fibre yams just is with a wide range of applications, because only just can obtain woven fabric, knitted fabric, braided fabric and other more various nanofiber product and application based on yarn.
The report of at present more existing electrostatic spinning nano fiber resultant yarns; A kind of preparation method of nano fiber endless tow is disclosed like Chinese patent 200510038571.5; Utilize relative placed metal syringe needle to connect both positive and negative polarity respectively; The fiber that gushes out from two syringe needles attracts each other, collides, forms composite nano fiber aloft; Drawn is wound into and forms the nanofiber tow on the cylinder of rotation, in this method in the endless tow fiber continuously, arrange well but not twisting effect is not the yarn of stricti jurise.Chinese patent 200810018267.8 discloses the preparation method of a kind of electrostatic spinning nano fiber yarn system and nano-fibre yams; Utilize the disk deposition electro spinning nano fiber of fluting, draw back twisting through lead-in wire and godet roller and obtain nano-fibre yams, fiber can not be collected in the groove fully in this patent; Cause the fiber waste; Disk whenever rotates a circle in addition needs with cutting knife in position cutting that bundles of nanofibers is pulled out once, and technology is comparatively complicated, and deficient in stability, continuity.Zhang [Kai Zhang; Journal of Polymer Science:Part B:Polymer Physics, 2010,48; 1118] etc. the metal needle point by ground connection guides the collection of filaments as auxiliary electrode; Realize the continuous collection of non-twist PLLA, PAN, PMIA nanofiber aggregate, but the electrical conductivity of polymer solution there is material impact to fiber aggregate in this gathering-device, only adapts to the electrical conductivity resultant yarn of polymer within the specific limits.Smit [Eugene Smit, Polymer, 2005,46,2419] etc. proposes the electrostatic spinning that water-bath is a receiving system the earliest, collects nanofiber through the water surface, by the surface tension of fiber in the bath and coagulating bath to the fiber assembly formation fibre bundle that stretches.Teo [Wee-Eong Teo, Polymer, 2007; 48; 3400] etc. the water-bath receiving system is improved, utilize dynamic water, and realized the boundling twisting of fiber through eddy current effect as coagulating bath; The efficient of water-bath collection nanofiber is higher, but only is applicable to non-water-soluble polymer resultant yarn.Said method all is to utilize traditional single needle head as spinning head, and output has only 0.1-1g/h, acquisition nano-fibre yams that can not steady and continuous, and the problem that exists fiber better not align in the yarn.
Summary of the invention
The Air-Jet Spinning that the purpose of this invention is to provide a kind of electrostatic spinning nano fiber becomes yarn feeding device, arranges nano-fibre yams preferably but serialization prepares fiber alignment, provides and utilizes above-mentioned Air-Jet Spinning to become yarn feeding device to prepare the method for nano-fibre yams.
Technical scheme of the present invention is: a kind of Air-Jet Spinning of electrostatic spinning nano fiber becomes yarn feeding device, and it comprises apparatus for collecting, and the apparatus for collecting both sides are provided with two spinning appts; Two spinning appts link to each other with HV generator; The apparatus for collecting below is provided with buncher, and two spinning appts are between apparatus for collecting and buncher, along the configuration relatively of axis symmetry; The buncher below is provided with the nozzle twister; Nozzle twister below is provided with delivery roller, and the delivery roller below is provided with winding mechanism, and said apparatus for collecting, buncher, nozzle twister and delivery roller are from top to bottom arranged along same axis.
Described spinning appts is to be provided with the air chamber of air inlet and solution chamber that a side is provided with inlet is formed by connecting through intermediate connector a side, and intermediate connector is provided with air jet pipe vertically upward, and solution chamber is provided with spinning head vertically upward.
Described air chamber and solution chamber are cylindrical; Minimum one of described spinning head and air jet pipe, they are concentric circles arranges, and the air jet pipe of the corresponding concentric of each spinning head is ventilated to it; The height of air jet pipe is lower than the upper end of spinning head; The upper surface that is higher than solution chamber, the internal diameter of spinning head are 1-40mm, and spacing is 0.1-15cm.
Described apparatus for collecting is rosette or the loudspeaker that have rotating shaft, and it pivots by transmission mechanism control, and rosette or bell-mouthed diameter are 1-2 times of solution chamber's upper surface diameter in the spinning appts; Described buncher import is tubaeform that diameter progressively narrows to outlet, and the diameter in exit is 0.8-8mm.
Described nozzle twister is made up of air inlet pipe, air chamber, spray-hole, yarn road, intervalve and outlet; The inner periphery in described spray-hole and yarn road is tangent; The aperture of spray-hole is 0.1-0.55mm, with the angle in yarn road be 30-50 °, spraying hole count is 2-8; The diameter of described yarn road above the spray-hole inlet is 0.8-2.0mm, length 8-15mm, and the diameter below the spray-hole inlet is 2.0-3.5mm, length 8-15mm; The diameter of described intervalve is 3.0-6.0mm, length 8-15mm; The diameter of described outlet is 5.0-10.0mm, length 5-12mm.
The angle of said spinning appts and axis is 15-40 °; The outlet of buncher links to each other with the inlet in yarn road in the nozzle twister; Distance between the spinning head upper end, center of two spinning appts is 5-50cm, and the distance between the center of apparatus for collecting is 6-60cm; The inlet and the distance between the apparatus for collecting in nozzle twister yarn road are 15-100cm.
The voltage of described HV generator is 10-200kV, and positive pole is connected with the spinning head of metal material in two spinning appts respectively with negative pole.
The spinning head of described spinning appts is a metal material, and all the other are insulating materials, and the outside of spinning head also is with insulating materials.
Described Air-Jet Spinning becomes yarn feeding device to prepare the method for nano-fibre yams, and its step is following:
A, utilize peristaltic pump or other at the uniform velocity liquid feed device with polymer spinning solution through the equal solution chamber that imports of inlet fastly, the liquid level of spinning solution is lower than the upper end of spinning head, is higher than the upper end of air jet pipe;
B, utilize crossing current air pump or other at the uniform velocity air-breather export gas continuously to air chamber through air inlet, gas is through upwards ejection of air jet pipe, spinning solution forms the solution convexity of hollow in the upper end of spinning head;
C, open the transmission mechanism of apparatus for collecting, apparatus for collecting pivots, and the control rotating speed is 10-2000 rev/min;
D, open HV generator, be adjusted to certain voltage, the positive pole of HV generator is connected with the spinning head of metal material in two spinning appts respectively with negative pole, and apparatus for collecting is earth-free.Under the high voltage electric field effect; Polarization charge accumulates in the protruding top of spinning head upper end solution and forms taylor cone; The taylor cone of hollow breaks under the effect of stream pressure and electrostatic force; The spinning head ejection of two spinning appts has the opposite charges jet, and through static drawing-off, attraction and neutralization, nanometer fiber net is deposited on the edge of apparatus for collecting;
E, the nanometer fiber net in the step (c) is drawn, is orientated and twists, the sticking plaster of an insulation is placed in the centermost of apparatus for collecting in advance, sticking plaster slowly backward along continuous straight runs extract out; Form the taper nanometer fiber net of hollow; The top sticks on the sticking plaster, and the bottom is connected with the edge of apparatus for collecting, further the vertex of a cone of drawing-off nanometer fiber net; Fiber orientation, be agglomerated into bundles of nanofibers, or further twist into the nanofiber bar of certain twist in advance through the rotation of apparatus for collecting;
F, the air inlet pipe of nozzle twister is connected with air compressor, compressed air is injected the yarn road by spray-hole, in the yarn road, forms the air-flow of rotation at a high speed, and goes into the interruption-forming negative pressure in the yarn road.Bundles of nanofibers in the step (d) (or nanofiber bar) is introduced buncher,, under the effect of swirling eddy, twist resultant yarn and along the yarn road, through intervalve, export from outlet because the bundles of nanofibers that exists of negative pressure is inhaled in the yarn road;
The nano-fibre yams of twisting is exported under the effect of delivery roller in g, the step (e), is wound into tube through winding mechanism.
The direction of rotation of said apparatus for collecting is identical with the direction of rotation of jet-stream wind in the nozzle twister yarn road; The high speed rotation that can rely on jet-stream wind in the yarn road that applies of the nano-fibre yams twist is accomplished separately, also can be accomplished jointly with the rotation of apparatus for collecting by the high speed rotation of jet-stream wind in the nozzle twister yarn road.
The invention has the beneficial effects as follows: electrostatic spinning nano fiber of the present invention becomes yarn feeding device collection spray silk, gathers, drawing-off, twist and be wound in one, can prepare the electrostatic spinning nano fiber yarn continuously.Spinning appts solution of the present invention is in the system of sealing, has reduced the volatilization of solvent in the solution like this, can keep stable solution concentration; The spinning head aperture is big; Through the continuous ventilation of air jet pipe, gas flow can avoid the clogging of spinning head to occur, and single spinning head can eject multiple jets; A plurality of spinning heads spray simultaneously, have greatly improved the output of electrostatic spinning nano fiber; Apparatus for collecting is in the joint of the positive and negative jet of two spinning appts ejection, can deposit and assemble the nanofiber after the charging neutrality well, and the rotation of apparatus for collecting simultaneously also can be played the twisting effect to bundles of nanofibers; Utilize the air-flow twisting of nozzle twister high speed rotation, do not need other complicated twisting parts, twister is simple in structure, and production efficiency is high; Can fineness, the twist and the output of nano-fibre yams be controlled through air pressure and the flow in the feed liquor speed, ventilation speed, apparatus for collecting rotating speed, twister of control solution.Nanofiber resultant yarn method technology of the present invention is simple, yarn output is high, is fit to the multiple polymers spinning solution, can realize serialization, the scale preparation of nano-fibre yams.
Description of drawings
Fig. 1 becomes yarn feeding device for the electrostatic spinning nano fiber Air-Jet Spinning, and wherein apparatus for collecting is the disk of metal material;
Fig. 2 becomes yarn feeding device for the electrostatic spinning nano fiber Air-Jet Spinning, and wherein apparatus for collecting is the loudspeaker of metal material;
Fig. 3 becomes the structural representation of spinning appts in the yarn feeding device for the electrostatic spinning nano fiber Air-Jet Spinning;
Fig. 4 becomes the structural representation of nozzle twister in the yarn feeding device for electrostatic spinning nano fiber Air-Jet Spinning of the present invention;
Fig. 5 spins the electron micrograph of PAN nano-fibre yams for static, and multiplication factor is 500 times;
Fig. 6 spins the electron micrograph of PAN nano-fibre yams for static, and multiplication factor is 5000 times;
Wherein: 1, spinning appts; 2, apparatus for collecting; 3, buncher; 4, nozzle twister; 5, delivery roller; 6, winding mechanism; 7, HV generator; 8, air chamber; 9, spinning head; 10, air jet pipe; 11, air inlet; 12, inlet; 13, intermediate connector; 14, solution chamber; 15, spray-hole; 16, yarn road; 17, intervalve; 18, outlet; 19, air chamber; 20, air inlet pipe.
The specific embodiment
Embodiment 1
By Fig. 1, Fig. 3 and shown in Figure 4, a kind of Air-Jet Spinning of electrostatic spinning nano fiber becomes yarn feeding device, comprises spinning appts 1, apparatus for collecting 2, buncher 3, nozzle twister 4, delivery roller 5, winding mechanism 6 and HV generator 7.
Spinning appts 1 is to have the air chamber 8 of air inlet 11 and solution chamber 14 that a side has inlet 12 to be formed by connecting through intermediate connector 13 a side, and air chamber 8 is cylindrical with solution chamber 14.Intermediate connector 13 is provided with air jet pipe 10 vertically upward, and solution chamber 14 is provided with spinning head 9 vertically upward.The number of spinning head 9 and air jet pipe 10 is 5, is concentric circles and arranges, and 1 at center, on the limit 4, the air jet pipe 10 of each spinning head 9 corresponding concentric is to its ventilation, and the height of air jet pipe 10 is lower than the upper end of spinning head 9, is higher than the upper surface of solution chamber 14.The internal diameter of spinning head 9 is 8.0 mm, and spacing is 5.0 cm.Spinning appts 1 is that all the other are insulating materials the metal material except that spinning head 9, and the outside of spinning head 9 also is with insulating materials.
Apparatus for collecting 2 is for having the rosette of rotating shaft, can it pivot by motor or other transmission mechanism control, and the diameter of rosette is 2 times of solution chamber's 14 upper surface diameters in the spinning appts 1.Buncher 3 imports are tubaeform that diameter progressively narrows to outlet, and the diameter in exit is 1.8 mm.
Nozzle twister 4 is made up of air inlet pipe 20, air chamber 19, spray-hole 15, yarn road 16, intervalve 17 and outlet 18.Spray-hole 15 is tangent with the inner periphery in yarn road 16, and the aperture of spray-hole 15 is 0.38 mm, with the angle in yarn road 16 be 45 °, spraying hole count is 6.The diameter of yarn road 16 above spray-hole 15 inlets is 1.3 mm, length 8.0 mm, and the diameter below spray-hole 15 inlets is 2.3 mm, length 10 mm.The diameter of intervalve 17 is 4.5 mm, length 10 mm.The diameter of outlet 18 is 8.0 mm, length 8.0 mm.
Apparatus for collecting 2, buncher 3, nozzle twister 4 and delivery roller 5 are from top to bottom arranged along same axis.Two spinning appts 1 are between apparatus for collecting 2 and buncher 3, and along the configuration relatively of axis symmetry, the inclination angle of spinning appts 1 (with the angle of axis) is 30 °.The outlet of buncher 3 links to each other with the inlet in yarn road 16 in the nozzle twister 4.Distance between center spinning head 9 upper ends of two spinning appts 1 is 12 cm; And the distance between the apparatus for collecting 2 (rosette center) is 10 cm, and the distance between the inlet in nozzle twister 4 yarn roads 16 and the apparatus for collecting 2 (rosette center) is 25 cm.
A kind of electrostatic spinning nano fiber Air-Jet Spinning becomes yarn feeding device to prepare the method for polyacrylonitrile (PAN) nano-fibre yams, may further comprise the steps:
A, PAN (weight average molecular weight 50,000) is dissolved in N, in the dinethylformamide (DMF), is made into mass concentration and is 13.5% spinning solution.Utilize peristaltic pump with PAN solution through the inlet 12 equal solution chamber that import fastly, the liquid level of PAN solution is lower than the upper end of spinning head 9, is higher than the upper end of air jet pipe 10;
B, utilization are flow over, and the output gases are to air chamber 8 continuously through air inlet 11 for air pump, and gas makes progress through air jet pipe 10 and sprays, and PAN solution is protruding at the solution that the upper end of spinning head 9 forms hollow;
C, open HV generator 7, be adjusted to certain voltage, the positive pole of HV generator 7 is connected with the spinning head 9 of metal material in two spinning appts 1 respectively with negative pole, and apparatus for collecting 2 (rosette) is earth-free.Polarization charge accumulates in the protruding top of spinning head 9 upper end solution and forms taylor cone under the high voltage electric field effect, and the taylor cone of hollow breaks under the effect of stream pressure and electrostatic force, ejects multiple jets.The jet of spinning head 9 ejections has opposite charges in two spinning appts 1, because the electrostatic attraction effect, can neutralize and is deposited on the edge of apparatus for collecting 2 (rosette) with the form of nanometer fiber net;
D, for the PAN nanometer fiber net in the step (c) is drawn, is orientated and twists; The sticking plaster of an insulation is placed in the centermost of apparatus for collecting 2 (rosette) in advance, when sticking plaster when slowly along continuous straight runs is extracted out backward, can form the taper nanometer fiber net of hollow; The top sticks on the sticking plaster; The bottom is connected with the edge of apparatus for collecting 2 (rosette), the vertex of a cone of further drawing-off nanometer fiber net, and fiber can be orientated, be agglomerated into the PAN bundles of nanofibers;
E, the air inlet pipe 20 of nozzle twister 4 is connected with air compressor, compressed air is injected yarn road 16 by spray-hole 15, in yarn road 16, forms the air-flow of rotation at a high speed, and goes into the interruption-forming negative pressure in yarn road 16.PAN bundles of nanofibers in the step (d) is introduced buncher 3, because the PAN bundles of nanofibers that exists of negative pressure is inhaled in the yarn road 16, twisting resultant yarn and along yarn road 16, through intervalve 17, export under the effect of swirling eddy from outlet 18;
The PAN nano-fibre yams of twisting is exported under the effect of delivery roller 5 in f, the step (e), is wound into tube through winding mechanism 6.
The transmission mechanism of apparatus for collecting 2 is not opened in this instance, and promptly apparatus for collecting 2 does not pivot, and therefore, the PAN nano-fibre yams is to rely in the yarn road 16 high speed of jet-stream wind to rotate separately to twist.It is as shown in Figure 5 that prepared static spins the electron micrograph of PAN nano-fibre yams.
Embodiment 2
By Fig. 2, Fig. 3 and shown in Figure 4, a kind of Air-Jet Spinning of electrostatic spinning nano fiber becomes yarn feeding device, comprises spinning appts 1, apparatus for collecting 2, buncher 3, nozzle twister 4, delivery roller 5, winding mechanism 6 and HV generator 7.
Spinning appts 1 is to have the air chamber 8 of air inlet 11 and solution chamber 14 that a side has inlet 12 to be formed by connecting through intermediate connector 13 a side, and air chamber 8 is cylindrical with solution chamber 14.Intermediate connector 13 is provided with air jet pipe 10 vertically upward, and solution chamber 14 is provided with spinning head 9 vertically upward.The number of spinning head 9 and air jet pipe 10 is 9, is concentric circles and arranges, and 1 at center, on the limit 8, the air jet pipe 10 of each spinning head 9 corresponding concentric is to its ventilation, and the height of air jet pipe 10 is lower than the upper end of spinning head 9, is higher than the upper surface of solution chamber 14.The internal diameter of spinning head 9 is 12 mm, and spacing is 4.0 cm.Spinning appts 1 is that all the other are insulating materials the metal material except that spinning head 9, and the outside of spinning head 9 also is with insulating materials.
Apparatus for collecting 2 is for having the metal loudspeaker of rotating shaft, can it pivot by motor or other transmission mechanism control, and the bell-mouthed diameter of metal is 1.8 times of solution chamber's 14 upper surface diameters in the spinning appts 1.Buncher 3 imports are tubaeform that diameter progressively narrows to outlet, and the diameter in exit is 2.0 mm.
Nozzle twister 4 is made up of air inlet pipe 20, air chamber 19, spray-hole 15, yarn road 16, intervalve 17 and outlet 18.Spray-hole 15 is tangent with the inner periphery in yarn road 16, and the aperture of spray-hole 15 is 0.40 mm, with the angle in yarn road 16 be 48 °, spraying hole count is 4.The diameter of yarn road 16 above spray-hole 15 inlets is 1.6 mm, length 10.0 mm, and the diameter below spray-hole 15 inlets is 3.0 mm, length 10 mm.The diameter of intervalve 17 is 5.5 mm, length 12 mm.The diameter of outlet 18 is 10.0 mm, length 7.0 mm.
Apparatus for collecting 2, buncher 3, nozzle twister 4 and delivery roller 5 are from top to bottom arranged along same axis.Two spinning appts 1 are between apparatus for collecting 2 and buncher 3, and along the configuration relatively of axis symmetry, the inclination angle of spinning appts 1 (with the angle of axis) is 35 °.The outlet of buncher 3 links to each other with the inlet in yarn road 16 in the nozzle twister 4.Distance between center spinning head 9 upper ends of two spinning appts 1 is 15 cm; And the distance between the apparatus for collecting 2 (center in horn mouth cross section) is 12 cm, and the distance between the inlet in nozzle twister 4 yarn roads 16 and the apparatus for collecting 2 (center in horn mouth cross section) is 32 cm.
A kind of electrostatic spinning nano fiber Air-Jet Spinning becomes yarn feeding device to prepare the method for PLA (PLA) nano-fibre yams, may further comprise the steps:
A, PLA (weight average molecular weight 80,000) is dissolved in the carrene, is made into mass concentration and is 8% spinning solution.Utilize peristaltic pump (accompanying drawing does not draw) with PLA solution through the inlet 12 equal solution chamber that import fastly, the liquid level of PLA solution is lower than the upper end of spinning head 9, is higher than the upper end of air jet pipe 10;
B, utilization are flow over, and the output gases are to air chamber 8 continuously through air inlet 11 for air pump, and gas makes progress through air jet pipe 10 and sprays, and PLA solution is protruding at the solution that the upper end of spinning head 9 forms hollow;
C, open the transmission mechanism of apparatus for collecting 2, make it pivot, the control rotating speed is 600 rev/mins;
D, open HV generator 7, be adjusted to certain voltage, the positive pole of HV generator 7 is connected with the spinning head 9 of metal material in two spinning appts 1 respectively with negative pole, and apparatus for collecting 2 (metal loudspeaker) is earth-free.Polarization charge accumulates in the protruding top of spinning head 9 upper end solution and forms taylor cone under the high voltage electric field effect, and the taylor cone of hollow breaks under the effect of stream pressure and electrostatic force, ejects multiple jets.The jet of spinning head 9 ejections has opposite charges in two spinning appts 1, because the electrostatic attraction effect, can neutralize and is deposited on the edge of apparatus for collecting 2 (metal loudspeaker) with the form of PLA nanometer fiber net;
E, for the PLA nanometer fiber net in the step (c) is drawn, is orientated and twists; The sticking plaster of an insulation is placed in the centermost of apparatus for collecting 2 (metal loudspeaker) in advance; When sticking plaster when slowly along continuous straight runs is extracted out backward, can form the taper nanometer fiber net of hollow, the top sticks on the sticking plaster; The bottom is connected with the edge of apparatus for collecting 2 (metal loudspeaker); The vertex of a cone of further drawing-off nanometer fiber net, fiber can be orientated, be agglomerated into bundles of nanofibers, and twists into the PLA nanofiber bar of certain twist in advance through the rotation of apparatus for collecting 2 (metal loudspeaker);
F, the air inlet pipe 20 of nozzle twister 4 is connected with air compressor, compressed air is injected yarn road 16 by spray-hole 15, in yarn road 16, forms the air-flow of rotation at a high speed, and goes into the interruption-forming negative pressure in yarn road 16.The PLA nanofiber bar of the preparatory twisting in the step (d) is introduced buncher 3, because the PLA nanofiber bar that exists of negative pressure is inhaled in the yarn road 16, twisting resultant yarn and along yarn road 16, through intervalve 17, export under the effect of swirling eddy from outlet 18;
The PLA nano-fibre yams of twisting is exported under the effect of delivery roller 5 in g, the step (e), is wound into tube through winding mechanism 6.
In this instance; The rotation of apparatus for collecting 2 (metal loudspeaker) just can be played preparatory twisting effect to the PLA bundles of nanofibers; Therefore, the twisting of PLA nano-fibre yams is to lean on the rotation of the high speed of jet-stream wind in the nozzle twister 4 yarn roads 16 and the rotation of apparatus for collecting 2 to accomplish jointly.
Claims (8)
1. the Air-Jet Spinning of an electrostatic spinning nano fiber becomes yarn feeding device; It is characterized in that: it comprises apparatus for collecting (2); Apparatus for collecting (2) both sides are provided with two spinning appts (1), and two spinning appts (1) link to each other with HV generator (7), and apparatus for collecting (2) below is provided with buncher (3); Two spinning appts (1) are positioned between apparatus for collecting (2) and the buncher (3); Along the configuration relatively of axis symmetry, buncher (3) below is provided with nozzle twister (4), and nozzle twister (4) below is provided with delivery roller (5); Delivery roller (5) below is provided with winding mechanism (6), and said apparatus for collecting (2), buncher (3), nozzle twister (4) and delivery roller (5) are from top to bottom arranged along same axis.
2. the Air-Jet Spinning of electrostatic spinning nano fiber according to claim 1 becomes yarn feeding device; It is characterized in that: described spinning appts (1) is to be provided with the air chamber (8) of air inlet (11) and solution chamber (14) that a side is provided with inlet (12) is formed by connecting through intermediate connector (13) a side; Intermediate connector (13) is provided with air jet pipe (10) vertically upward, and solution chamber (14) is provided with spinning head (9) vertically upward.
3. the Air-Jet Spinning of a kind of electrostatic spinning nano fiber according to claim 2 becomes yarn feeding device, it is characterized in that: described air chamber (8) and solution chamber (14) are for cylindrical; Minimum one of described spinning head (9) and air jet pipe (10); They are concentric circles and arrange; The air jet pipe (10) of the corresponding concentric of each spinning head (9) is to its ventilation, and the height of air jet pipe (10) is lower than the upper end of spinning head (9), is higher than the upper surface of solution chamber (14); The internal diameter of spinning head (9) is 1-40mm, and spacing is 0.1-15cm.
4. the Air-Jet Spinning of electrostatic spinning nano fiber according to claim 3 becomes yarn feeding device; It is characterized in that: described apparatus for collecting (2) is for having the rosette or the loudspeaker of rotating shaft; It pivots by transmission mechanism control, and rosette or bell-mouthed diameter are 1-2 times of solution chamber (14) upper surface diameter in the spinning appts (1); Described buncher (3) import is tubaeform that diameter progressively narrows to outlet, and the diameter in exit is 0.8-8mm.
5. the Air-Jet Spinning of electrostatic spinning nano fiber according to claim 4 becomes yarn feeding device; It is characterized in that: described nozzle twister (4) is made up of air inlet pipe (20), air chamber (19), spray-hole (15), yarn road (16), intervalve (17) and outlet (18); Described spray-hole (15) is tangent with the inner periphery in yarn road (16); The aperture of spray-hole (15) is 0.1-0.55mm, with the angle of yarn road (16) be 30-50 °, spraying hole count is 2-8; Described yarn road (16) is 0.8-2.0mm at the diameter of spray-hole (15) inlet top, length 8-15mm, and the diameter in spray-hole (15) inlet below is 2.0-3.5mm, length 8-15mm; The diameter of described intervalve (17) is 3.0-6.0mm, length 8-15mm; The diameter of described outlet (18) is 5.0-10.0mm, length 5-12mm.
6. the Air-Jet Spinning of electrostatic spinning nano fiber according to claim 5 becomes yarn feeding device, it is characterized in that: said spinning appts (1) is 15-40 ° with the angle of axis; The outlet of buncher (3) links to each other with the inlet in yarn road (16) in the nozzle twister (4); Distance between center spinning head (9) upper end of two spinning appts (1) is 5-50cm, and the distance between the center of apparatus for collecting (2) is 6-60cm; Distance between the inlet in nozzle twister (4) yarn road (16) and the apparatus for collecting (2) is 15-100cm.
7. the Air-Jet Spinning of electrostatic spinning nano fiber according to claim 6 becomes yarn feeding device; It is characterized in that: the voltage of described HV generator (7) is 10-200kV, and positive pole is connected with the spinning head (9) of metal material in two spinning appts (1) respectively with negative pole.
8. become yarn feeding device to prepare the method for nano-fibre yams according to each described Air-Jet Spinning of claim 1 ~ 7, it is characterized in that its step is following:
A, utilize peristaltic pump or other at the uniform velocity liquid feed device with polymer spinning solution through the equal solution chamber that imports of inlet (12) fastly, the liquid level of spinning solution is lower than the upper end of spinning head (9), is higher than the upper end of air jet pipe (10);
B, utilize crossing current air pump or other at the uniform velocity air-breather export gas continuously to air chamber (8) through air inlet (11), gas is through upwards ejection of air jet pipe (10), spinning solution is in the solution convexity of the upper end of spinning head (9) formation hollow;
C, open the transmission mechanism of apparatus for collecting (2), apparatus for collecting (2) pivots, and the control rotating speed is 10-2000 rev/min;
D, open HV generator (7); Be adjusted to certain voltage, the positive pole of HV generator (7) is connected with the spinning head (9) of metal material in two spinning appts (1) respectively with negative pole, and apparatus for collecting (2) is earth-free; Under the high voltage electric field effect; Polarization charge accumulates in the protruding top of spinning head (9) upper end solution and forms taylor cone, and the taylor cone of hollow breaks under the effect of stream pressure and electrostatic force, and spinning head (9) ejection of two spinning appts (1) has the opposite charges jet; Through static drawing-off, attraction and neutralization, nanometer fiber net is deposited on the edge of apparatus for collecting (2);
E, the nanometer fiber net in the step (c) is drawn, is orientated and twists; The sticking plaster of an insulation is placed in the centermost of apparatus for collecting (2) in advance; Sticking plaster is along continuous straight runs extraction backward slowly, forms the taper nanometer fiber net of hollow, and the top sticks on the sticking plaster; The bottom is connected with the edge of apparatus for collecting (2); The further vertex of a cone of drawing-off nanometer fiber net, is agglomerated into bundles of nanofibers at fiber orientation, or further twists into the nanofiber bar of certain twist in advance through the rotation of apparatus for collecting (2);
F, the air inlet pipe (20) of nozzle twister (4) is connected with air compressor; Compressed air is injected yarn road (16) by spray-hole (15); In yarn road (16), form the air-flow of rotation at a high speed; And go into the interruption-forming negative pressure in yarn road (16); Bundles of nanofibers in the step (d) (or nanofiber bar) is introduced buncher (3),, under the effect of swirling eddy, twist resultant yarn and along yarn road (16), through intervalve (17), export from outlet (18) because the bundles of nanofibers that exists of negative pressure is inhaled in the yarn road (16);
The nano-fibre yams of twisting is exported under the effect of delivery roller (5) in g, the step (e), is wound into tube through winding mechanism (6).
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