CN111826725A - Continuous assembly line type electrostatic spinning liquid supply device - Google Patents
Continuous assembly line type electrostatic spinning liquid supply device Download PDFInfo
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- CN111826725A CN111826725A CN201910296919.2A CN201910296919A CN111826725A CN 111826725 A CN111826725 A CN 111826725A CN 201910296919 A CN201910296919 A CN 201910296919A CN 111826725 A CN111826725 A CN 111826725A
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- liquid box
- liquid
- electrostatic spinning
- spinning
- spinning roller
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- 239000007788 liquid Substances 0.000 title claims abstract description 368
- 238000010041 electrostatic spinning Methods 0.000 title claims abstract description 120
- 238000009987 spinning Methods 0.000 claims abstract description 103
- 239000004744 fabric Substances 0.000 claims abstract description 28
- 239000000463 material Substances 0.000 claims abstract description 20
- 238000010924 continuous production Methods 0.000 claims abstract description 19
- 238000004519 manufacturing process Methods 0.000 claims abstract description 8
- 230000005540 biological transmission Effects 0.000 claims description 50
- 239000006229 carbon black Substances 0.000 claims description 13
- 230000008093 supporting effect Effects 0.000 claims description 13
- 238000000034 method Methods 0.000 claims description 12
- 229910000639 Spring steel Inorganic materials 0.000 claims description 11
- 230000005611 electricity Effects 0.000 claims description 11
- 230000008569 process Effects 0.000 claims description 10
- -1 polytetrafluoroethylene Polymers 0.000 claims description 6
- 239000004793 Polystyrene Substances 0.000 claims description 5
- 229920002223 polystyrene Polymers 0.000 claims description 5
- 239000011810 insulating material Substances 0.000 claims description 4
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 4
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 4
- 239000004677 Nylon Substances 0.000 claims description 3
- 229920001778 nylon Polymers 0.000 claims description 3
- 229920006324 polyoxymethylene Polymers 0.000 claims description 3
- 239000004698 Polyethylene Substances 0.000 claims description 2
- 239000003822 epoxy resin Substances 0.000 claims description 2
- HCDGVLDPFQMKDK-UHFFFAOYSA-N hexafluoropropylene Chemical group FC(F)=C(F)C(F)(F)F HCDGVLDPFQMKDK-UHFFFAOYSA-N 0.000 claims description 2
- 229920000647 polyepoxide Polymers 0.000 claims description 2
- 229920000573 polyethylene Polymers 0.000 claims description 2
- 229920002635 polyurethane Polymers 0.000 claims description 2
- 239000004814 polyurethane Substances 0.000 claims description 2
- 229920000915 polyvinyl chloride Polymers 0.000 claims description 2
- 239000004800 polyvinyl chloride Substances 0.000 claims description 2
- 239000000243 solution Substances 0.000 description 53
- 239000002121 nanofiber Substances 0.000 description 22
- 239000000123 paper Substances 0.000 description 12
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 8
- 238000012423 maintenance Methods 0.000 description 8
- 239000000047 product Substances 0.000 description 7
- 239000002131 composite material Substances 0.000 description 6
- 230000008859 change Effects 0.000 description 5
- 238000013461 design Methods 0.000 description 4
- 238000001523 electrospinning Methods 0.000 description 4
- 238000007590 electrostatic spraying Methods 0.000 description 4
- 238000001914 filtration Methods 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 3
- 230000008901 benefit Effects 0.000 description 3
- 238000004140 cleaning Methods 0.000 description 3
- 230000001815 facial effect Effects 0.000 description 3
- 239000011086 glassine Substances 0.000 description 3
- 239000012528 membrane Substances 0.000 description 3
- 238000011045 prefiltration Methods 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- 239000002904 solvent Substances 0.000 description 3
- 238000003860 storage Methods 0.000 description 3
- 230000009471 action Effects 0.000 description 2
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- 238000005516 engineering process Methods 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 229920003023 plastic Polymers 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 229920003171 Poly (ethylene oxide) Polymers 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009960 carding Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002103 nanocoating Substances 0.000 description 1
- 238000011020 pilot scale process Methods 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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Images
Classifications
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- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
- D01D5/00—Formation of filaments, threads, or the like
- D01D5/0007—Electro-spinning
- D01D5/0061—Electro-spinning characterised by the electro-spinning apparatus
-
- 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
- D01D5/0069—Electro-spinning characterised by the electro-spinning apparatus characterised by the spinning section, e.g. capillary tube, protrusion or pin
-
- 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
- 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
- D01D5/0092—Electro-spinning characterised by the electro-spinning apparatus characterised by the electrical field, e.g. combined with a magnetic fields, using biased or alternating fields
Abstract
The invention provides a continuous production line type electrostatic spinning liquid supply device which comprises a liquid box (1), a liquid box conveying device (2), a liquid box guide rail (3), a spinning roller driving device (4) and a high-voltage power supply device (5). The liquid boxes (1) are positioned below the electrostatic spinning receiving device (10) and are arranged perpendicular to the base material cloth moving direction; the liquid box (1) is driven by the liquid box conveying device (2) to move along the base material cloth moving direction or the direction opposite to the base material cloth moving direction; the spinning roller driving device drives the spinning roller (7) in the liquid box (1) to rotate; when the liquid box (1) enters an electrostatic spinning working area, a high-voltage connecting sheet (6) on the liquid box (1) is communicated with a high-voltage power supply device (5), so that electrostatic spinning is started; when the property of the solution in the liquid box (1) changes and cannot meet the production requirement, the liquid box (1) is unloaded from the guide rail (3) in the unloading area, and a new liquid box is loaded on the guide rail (3) in the liquid box loading area (11).
Description
Technical Field
Electrospinning and electrostatic spraying are extremely convenient and energy-efficient processes for producing nano-coatings. In recent years, more and more attention is paid to electrostatic spinning and electrostatic spraying processes in the industry, and the electrostatic spinning and electrostatic spraying processes are widely applied to the fields of biomedicine, energy batteries, filter materials, sensors and the like due to the characteristics of extremely fine fiber diameter, high specific surface area and high porosity. Therefore, the requirements for preparation precision and productivity of mass-production equipment for electrostatic spinning and electrostatic spraying are higher and higher.
Background
The liquid supply system of the traditional multi-needle electrostatic spinning equipment mainly comprises an injection pump, a needle tube and a metal needle, so that the equipment is complex, the yield is extremely low, the needle can be blocked, and the uniformity of products is influenced.
Needle-free electrospinning has also been used more widely in industry because of its greater throughput. In the prior needle-free electrostatic spinning device, the needle-free electrostatic spinning technologies such as those disclosed in patent application numbers US8366986B2 and 201310186515.0 cannot operate for a long time and need high maintenance frequency. This is mainly due to the fact that during long-term operation, the solute in the solution can deposit on the electrospinning emitter, and the concentration and properties of the solution in the solution tank can change, thereby affecting the uniformity of the final product.
The electrostatic spinning device disclosed in U.S. patent application No. US8366986B2 includes a chain electrode as a needle-free electrostatic spinning emitter, so as to realize continuous needle-free electrostatic spinning. However, after long-time operation, especially for the solution with high volatility, the solute in the electrostatic spinning solution can be deposited on the chain electrode, thereby affecting the uniformity of electrostatic spinning. In addition, although the polymer solution for electrostatic spinning is filled in a relatively closed plastic tank and periodically supplemented with the solution, the concentration and properties of the solution in the plastic tank change during long-term operation, thereby affecting the uniformity of electrostatic spinning. Secondly, the needle-free electrostatic spinning device is complex in structure, difficult to clean and not beneficial to equipment maintenance.
The tip type pinless electrostatic spinning device disclosed in chinese patent application No. 201310186515.0 realizes the pinless electrostatic spinning by using a chain to convey a needle plate with metal card clothing. The metal card clothing is solid card clothing of a carding machine. However, after long-time working, especially for the solution with high volatility, the solute in the electrostatic spinning solution can be deposited on the metal needle, thereby affecting the uniformity of electrostatic spinning. In addition, the spinning solution storage box, the spinning box body and the base cloth form a closed spinning space. Because the space of the solution is large, the concentration and the property of the solution in the spinning solution storage box can be changed after long-time work, and therefore the uniformity of electrostatic spinning is influenced.
SUMMARY
It is to be understood that all combinations of the foregoing concepts and additional concepts discussed in greater detail below (assuming such concepts are not mutually inconsistent) are considered to be part of the inventive subject matter disclosed herein. In particular, all combinations of claimed subject matter appearing in this disclosure are considered part of the inventive subject matter disclosed herein. It should also be understood that the terminology explicitly used herein may be found in any disclosure incorporated by reference herein, and should be accorded the most consistent meaning with the specific concepts disclosed herein.
In order to solve the problem that the nanofiber obtained by electrostatic spinning is uneven due to the fact that the solution property changes caused by solvent volatilization when the existing electrostatic spinning pilot-scale and mass production-scale equipment is in continuous operation, the defects can be overcome by designing a continuous assembly line type electrostatic spinning liquid supply device, and 24-hour continuous, uniform and stable electrostatic spinning is achieved. Meanwhile, the electrostatic spinning liquid supply device designed by the invention can also replace spinning solution on line, so that various complex composite electrostatic spinning products can be conveniently produced. In addition, the electrostatic spinning liquid supply device designed by the invention can also effectively reduce the maintenance frequency of electrostatic spinning equipment. Because the liquid box can be cleaned and replaced regularly during the working process, the maintenance frequency of the equipment is lower than that of other industrial-grade equipment.
The invention provides a continuous assembly line type electrostatic spinning liquid supply device, which comprises:
liquid box (1), liquid box conveyer (2), liquid box guide rail (3), spinning roller drive arrangement (4), high voltage power supply unit (5), its characterized in that: the liquid boxes (1) are positioned below the electrostatic spinning receiving device (10) and are arranged perpendicular to the base material cloth moving direction; a plurality of liquid boxes (1) are uniformly arranged on the liquid box guide rail (3) along the base material cloth moving direction; the liquid box (1) is driven by the liquid box conveying device (2) to move along the base material cloth moving direction or the direction opposite to the base material cloth moving direction; when the liquid box (1) moves forwards, the spinning roller driving device drives the spinning roller (7) in the liquid box (1) to rotate; when the liquid box (1) enters an electrostatic spinning working area, a high-voltage connecting sheet (6) on the liquid box (1) is communicated with a high-voltage power supply device (5), so that the solution in the liquid box (1) is charged with high voltage for electrostatic spinning; when the solution in the liquid box (1) is insufficient or the property of the solution is changed and cannot meet the production requirement along with the proceeding of electrostatic spinning, the liquid box (1) enters a liquid box unloading area (12), an old liquid box (1) is unloaded from a guide rail (3) in the liquid box unloading area (12), and a new liquid box is loaded on the guide rail (3) in a liquid box loading area (11), so that the continuous flow-line type electrostatic spinning liquid supply is realized. Compared with the prior patents, some disclose a closed liquid storage tank, and some disclose a mode of conveying a chain or a needle plate to carry out electrostatic spinning, which do not well solve the problem that the solution concentration changes to influence the performance of the final electrostatic spinning product during long-time electrostatic spinning. The invention uses the liquid box conveying mode to carry out electrostatic spinning, and well solves the problem that the concentration of the working solution is kept constant when the electrostatic spinning works continuously for a long time. The spinning mode of the transmission liquid box is not realized by simply conveying the liquid box (1) by using the liquid box conveyor belt (20) in an electrostatic spinning working area, but the structure and the material are precisely calculated and designed so as to ensure the safety, the reliability and the universality of the transmission liquid box. The design of the high-voltage power supply device (5) and the high-voltage connecting sheet (6) on the liquid box (1) ensures that the liquid box (1) only has high voltage in an electrostatic spinning working area, thereby ensuring the safety when the liquid box loading area (11) and the liquid box unloading area (12) work. The groove (9) at the bottom of the liquid box (1), the material selection and the design of the liquid box guide rail (3) are matched with the design of the liquid box conveying device (2) to ensure the stability of the liquid box (1) in the movement of an electrostatic spinning working area, so that the electrostatic spinning product has good uniformity, and the reliability of electrostatic spinning equipment is ensured. The design of the spinning roller driving device (4) and the liquid box transmission device (2) can enable the liquid box (1) to advance at any speed, and enable the spinning rollers (7) in the liquid box (1) to rotate at any speed to renew the solution, so that the universality of the electrostatic spinning equipment is ensured. Aiming at solutions with slow volatility (such as polystyrene and toluene solutions), the spinning roller driving device (4) and the liquid box transmission device (2) are operated at low speed, so that the solution replacement frequency is reduced, and waste liquid is reduced; for highly volatile solutions (such as polyethylene oxide and ethanol solutions), the spinning roller driving device (4) and the liquid box transmission device (2) run at high speed, so that the solution replacement frequency is accelerated, and the quality of electrostatic spinning products is ensured.
The continuous production line type electrostatic spinning liquid supply device is also characterized in that the liquid box (1) is a liquid groove made of insulating materials, and a spinning roller (7) is horizontally arranged in the liquid box (1). The length of the liquid box (1) is 0.3-3m, the width is 0.1-0.3m, and the height is 0.1-0.3 m; the length, the width and the height of the liquid box (1) can be adjusted according to the requirements of the electrostatic spinning process; one end of the liquid box (1) is provided with a high-voltage connecting sheet (6) which is composed of a spring steel sheet (13) and carbon black (14), and the high-voltage connecting sheet (6) guides external high-voltage electricity into the solution in the liquid box (1); two small grooves are arranged on the box walls at the two ends of the liquid box (1) and are used for supporting the spinning roller (7); the spinning roller (7) is provided with a gear (8) at one end of the liquid box (1) without a high-pressure connecting sheet. The bottom of the liquid box (1) is provided with two grooves (9) for connecting the liquid box guide rails (3).
The continuous production line type electrostatic spinning liquid supply device is characterized in that the liquid box (1) is made of insulating materials including polyformaldehyde, nylon, polytetrafluoroethylene, polyurethane, epoxy resin, polystyrene, polyethylene, polystyrene, polyvinyl chloride, perfluoropropylene and the like. Preferably, the liquid cartridge (1) has a length of 0.3 to 2.1m, a width of 0.1 to 0.2m and a height of 0.1 to 0.2 m. The liquid box (1) is a part directly connected with high voltage electricity in the electrostatic spinning equipment, simultaneously bears the loading solution and supports the function of the emitter spinning roller (7), so the material selected by the liquid box (1) has better insulation. The spring steel sheet (13) and the carbon black (14) on the high-voltage connecting sheet (6) on the liquid box (1) are designed because the spring steel sheet and the carbon black have certain elasticity, so that the liquid box (1) can be ensured to be in close contact with the conductive electric stick (10) in a working area.
The continuous production line type electrostatic spinning liquid supply device is also characterized in that the liquid box guide rails (3) are two linear guide rails, are arranged along the cloth moving direction, are distributed on two sides of the working area in parallel, are used for supporting the liquid box (1), and play a role in guiding the movement of the liquid box (1). The electrostatic spinning working area is positioned in the middle part of the guide rail (3); in the cloth running direction, the guide rail before the working area is called a liquid box loading area (11), and the guide rail after the working area is called a liquid box unloading area (12).
The continuous production line type electrostatic spinning liquid supply device is also characterized in that the liquid box transmission device (2) comprises two liquid box transmission belts (20), a plurality of liquid box stop blocks (15), a liquid box transmission driving shaft (16), a liquid box transmission driven shaft (17), a liquid box transmission driving connector (18) and a liquid box transmission driving motor (19); the liquid box stop blocks (15) are uniformly distributed on the liquid box conveyor belt (20) along the conveying direction; two liquid box conveying belts (20) are arranged between the liquid box conveying driving shaft (16) and the liquid box conveying driven shaft (17); the distance between the liquid box stop blocks (15) on the same liquid box conveyor belt (20) is 0.2-0.5 m. The liquid box transmission driving shaft (16) is driven by a liquid box transmission driving motor (19) through a liquid box transmission driving connector (18). The shape and material of the liquid cartridge stop (15) may be optional, but its width and arrangement position are carefully calculated results. The width of the liquid box stop block (15) can not be too large, and the width of the liquid box stop block should be adjusted according to the diameters of the liquid box transmission driving shaft (16) and the liquid box transmission driven shaft (17). If the width of the liquid box stopper (15) is too large, the stopper is easily peeled off from the liquid box transmission belt (20) when passing through the liquid box transmission driving shaft (16) and the liquid box transmission driven shaft (17). The distance between the other two liquid box stop blocks (15) is to ensure that the liquid boxes (1) pushed by the other two liquid box stop blocks do not influence each other during the electrostatic spinning work.
The continuous assembly line type electrostatic spinning liquid supply device also has the following characteristics that the liquid box transmission device (2) can adjust the movement direction and the movement speed of the transmission belt according to the requirements of the electrostatic spinning process. The liquid box transmission device (2) can enable the liquid box (1) to pass through the electrostatic spinning working area at a constant speed and a variable speed.
The continuous production line type electrostatic spinning liquid supply device is also characterized in that the spinning roller driving device (4) is composed of a spinning roller conveyor belt (21), a spinning roller rotation driving connector (22), a spinning roller conveyor belt supporting table (23) and a spinning roller rotation driving motor (24); the spinning roller conveyor belt (21) is a tooth-shaped conveyor belt and is meshed with a spinning roller gear (8) on a spinning roller (7) shaft; the spinning roller conveyor belt support table (23) plays a role of supporting the spinning roller conveyor belt (21) and simultaneously ensures the tight meshing of the spinning roller conveyor belt (21) and the spinning roller gear (8); the spinning roller conveyor belt (21) is driven by a spinning roller rotation driving motor (24) through a spinning roller rotation driving connector (22); the moving direction and the moving speed of the spinning roller conveyor belt (21) can be adjusted according to the requirements of the electrostatic spinning process.
The continuous assembly line type electrostatic spinning liquid supply device is also characterized in that the high-voltage power supply device (5) consists of a high-voltage power supply, a high-voltage wire and a conductive electric stick (10); the length of the conductive electric stick (10) is the same as that of the electrostatic spinning working area, and the conductive electric stick is placed on one side of the liquid box (1) with the high-voltage electric connection sheet (6) along the cloth moving direction; the conductive electric stick (10) is embedded in the insulating seat (25) and only leaks out of one surface facing the liquid box; the conductive electric stick (10) is connected with a high-voltage power supply through a high-voltage wire so as to bring high voltage; when the liquid box enters the working area, the carbon black (14) on the high-voltage connecting sheet (6) of the liquid box is contacted with the conductive electric stick (10) so as to lead the solution in the liquid box to be charged with high voltage.
Compared with the prior art, the invention has the advantages that: the continuous production line type electrostatic spinning liquid supply device can be used for continuously producing the solution which is easy to volatilize and short in service life. Most of the existing equipment adopts a continuous liquid supply mode to carry out electrostatic spinning, the concentration and the solution property of a spinning solution, especially a high-volatility solution can change along with time, so that the aim of continuous production can not be actually achieved, and the device really realizes continuous production.
The continuous assembly line type electrostatic spinning liquid supply device can replace spinning solution on line, so that various complex composite electrostatic spinning products can be conveniently produced.
The continuous assembly line type electrostatic spinning liquid supply device can reduce the maintenance frequency of electrostatic spinning equipment. Because the liquid box can be cleaned and replaced regularly during the working process, the maintenance frequency of the equipment is lower than that of other industrial-grade equipment.
Brief description of the drawings
FIG. 1 is a schematic structural view of an electrospinning liquid supply device provided by the present invention;
FIG. 2 is a partial view of the electrical connection between the cartridge and the high voltage provided by the present invention;
in the drawings: 1. a liquid box; 2. a liquid cartridge transfer device; 3. a liquid cartridge guide rail; 4. a spinning roller drive device; 5. a high voltage power supply; 6. a high-voltage connecting sheet; 7. a spinning roller; 8. a gear; 9. a groove; 10. an electrostatic spinning receiving device; 11. a liquid cartridge loading zone; 12. a liquid box unloading area; 13. a spring steel sheet; 14. carbon black; 15. a liquid box stop block; 16. the liquid box transmits the driving shaft; 17. the liquid box transmits the driven shaft; 18. a liquid cartridge transfer connector; 19. a liquid box conveying driving motor; 20. a liquid cartridge conveyor belt; 21. a spinning roller conveyor belt; 22. the spinning roller rotates to drive the connector; 23. a spinning roller conveyor belt support table; 24. the spinning roller rotates the driving motor.
Detailed Description
In the following detailed description, for purposes of explanation and not limitation, representative embodiments disclosing specific details are set forth in order to provide a thorough understanding of the claimed invention. However, it will be apparent to one having ordinary skill in the art having had the benefit of the present disclosure that other embodiments according to the teachings of the present invention that depart from the details disclosed herein remain within the scope of the appended claims. Moreover, descriptions of well-known apparatus and methods may be omitted so as to not obscure the description of the representative embodiments. Such methods and apparatus are clearly within the scope of the claimed invention.
The invention is further described with reference to the following drawings and specific examples, which are not intended to be limiting.
Example 1
A continuous assembly line type electrostatic spinning liquid supply device shown in FIG. 1 is used for preparing nanofiber composite filter paper for pre-filtration of a gas turbine. Gas turbine pre-filter cartridges require 75% filtration efficiency for 0.3 μm particles. The common filter paper has 25% efficiency for 0.3 μm particle filtration, which is much lower than the gas turbine pre-filtration requirement. Therefore, a layer of nanofiber membrane is compounded on the common filter paper by adopting the electrostatic spinning technology to improve the filtration efficiency.
As the actual filter paper coiled material has the width requirement of 3m and the coil diameter requirement of 1m, the electrostatic spinning cloth-moving speed is set at 2m/min to prepare the nanofiber membrane with enough thickness to meet the requirement of 75 percent of filtering efficiency. The time required to prepare a roll of nanofiber composite filter paper was 14 hours.
The filter paper coil with the width of 3m is uncoiled by an uncoiler and then wound on a coiling end through an electrostatic spinning receiving device (10).
The continuous assembly line type electrostatic spinning liquid supply device is positioned below a receiving device (10) of electrostatic spinning and is arranged perpendicular to the filter paper cloth moving direction; the width of the receiving device (10) for electrostatic spinning is 3m, and the length is 2 m.
4 liquid boxes (1) are uniformly placed on the liquid box guide rail (3) along the filter paper cloth moving direction; the liquid box (1) is a liquid tank made of polyformaldehyde materials, and a spinning roller (7) is horizontally arranged in the liquid box (1). The liquid box (1) has the length of 3m, the width of 0.3m and the height of 0.3 m; one end of the liquid box (1) is provided with a high-voltage connecting sheet (6) which is composed of a spring steel sheet (13) and carbon black (14), and the high-voltage connecting sheet (6) guides external high-voltage electricity into the solution in the liquid box (1); two small grooves are arranged on the box walls at the two ends of the liquid box (1) and are used for supporting the spinning roller (7); the length of the spinning roller (7) is 3.1m, and the diameter is 150 mm; the spinning roller (7) is provided with a gear (8) at one end shaft head of the liquid box (1) without a high-pressure connecting sheet (6). The bottom of the liquid box (1) is provided with two grooves (9) for connecting the liquid box guide rails (3).
The liquid box guide rails (3) are two linear guide rails made of polytetrafluoroethylene, the length of the linear guide rails is 6m, the linear guide rails are placed along the cloth moving direction, and the linear guide rails are distributed on two sides of the working area in parallel and used for supporting the liquid box (1) and guiding the movement of the liquid box (1). The electrostatic spinning working area is positioned in the middle part of the guide rail (3); the linear guide rail in front of the working area is 2m long in the cloth feeding direction and is called a liquid box loading area (11), and the linear guide rail behind the working area is 2m long and is called a liquid box unloading area (12).
4 liquid boxes are positioned in the liquid box loading area (11); the distance between each liquid box is 0.2 m; each cartridge contained 5L of 5 wt% PVB/ethanol solution.
The liquid box transmission device (2) comprises two liquid box transmission belts (20) 13m long, a liquid box transmission driving shaft (16), a liquid box transmission driven shaft (17), a liquid box transmission driving connector (18) and a liquid box transmission driving motor (19); each liquid box conveyor belt (20) is provided with 26 liquid box stoppers (15); the liquid box stop blocks (15) are uniformly distributed on the liquid box conveyor belt (20) along the conveying direction; two liquid box conveying belts (20) are arranged between the liquid box conveying driving shaft (16) and the liquid box conveying driven shaft (17); the distance between the liquid box stop blocks (15) on the same liquid box conveyor belt (20) is 0.5 m. The liquid box transmission driving shaft (16) is driven by a liquid box transmission driving motor (19) through a liquid box transmission driving connector (18).
When spinning begins, the two liquid box conveyor belts (20) are driven forwards for 2m along the cloth moving direction, and under the action of the liquid box stop blocks (15), 4 liquid boxes (1) in the liquid box loading area (11) are conveyed into the working area.
After 4 liquid boxes (1) enter the working area, a gear (8) on a spinning roller (7) in the liquid boxes (1) is meshed with a spinning roller conveyor belt (21) of a spinning roller driving device (4). The spinning roller rotating drive motor (24) drives the spinning roller conveyor belt (21) to move on the spinning roller conveyor belt support table (23) through the spinning roller rotating driver (22) to drive the spinning roller (7) to rotate at the speed of 10 r/min.
After 4 liquid boxes (1) enter a working area, carbon black (14) on a spring steel sheet (13) of each liquid box is connected with a conductive electric stick (10) with high voltage electricity, so that the solution in the liquid boxes (1) is charged with 35kV high voltage electricity to carry out electrostatic spinning.
After 2 hours of spinning, the solution in the liquid box in the working area cannot meet the production requirement of electrostatic spinning due to the volatilization of the solvent ethanol. 4 fresh cartridges (1) containing 5L of a 5% by weight PVB/ethanol solution are placed on the guide rails (3) of the cartridge loading zone (11). And (3) braking the liquid box transmission device (2), enabling the liquid box conveyor belt (20) to move forwards for 2m, conveying 4 liquid boxes (1) originally positioned in the working area to the liquid box unloading area (12), and simultaneously conveying 4 new liquid boxes positioned in the liquid box loading area (11) to the working area for electrostatic spinning.
After the liquid box (1) is conveyed to the liquid box unloading area (12), the gear (8) on the spinning roller (7) in the liquid box (1) is separated from the spinning roller conveyor belt (21) of the spinning roller driving device (4). The spinning roller (7) stops rotating.
After the liquid box (1) is conveyed to the liquid box unloading area (12), the carbon black (14) on the spring steel sheet (13) of the liquid box (1) is separated from the conductive electric stick (10), so that the liquid box (1) and the solution in the liquid box are disconnected from high voltage electricity. Thereby enabling the liquid cartridge (1) in the liquid cartridge unloading area (12) to be safely transported.
4 liquid boxes (1) in the liquid box unloading area (12) are taken down from the guide rail (3) for cleaning, and the solution is replaced for reuse. Thereby realizing continuous production line type electrostatic spinning liquid supply.
The continuous production line type electrostatic spinning liquid supply device disclosed by the invention is used for preparing the nanofiber composite filter paper, uninterrupted production can be realized for 24 hours, and the shutdown caused by the property change of the solution can be avoided.
The nanofiber composite filter paper prepared by the continuous assembly line type electrostatic spinning liquid supply device disclosed by the invention has the advantages that the maintenance period of the device is once every 2 months due to the regular cleaning and replacement of the liquid box, and is longer than that of other electrostatic spinning devices.
Example 2
The nanofiber mask is prepared by using the continuous assembly line type electrostatic spinning liquid supply device disclosed by the invention. The nanofiber mask is obtained by co-spinning PVA nanofibers with a supporting effect and HA nanofibers rich in essence components. Due to the extremely high porosity and specific surface area of the nanofiber mask, the essence components rich in the nanofiber mask are extremely easy to dissolve and absorb, and in addition, the nanofiber mask also has the characteristics of being ultrathin and ultra-light.
Due to practical requirements, the nanofiber prepared by electrostatic spinning is deposited on release paper, and the nanofiber membrane is peeled from glassine paper in a subsequent process to form the nanofiber facial mask. The breadth of the nanofiber mask is 0.3m, the winding diameter requirement is 0.5m, and the electrostatic spinning cloth-moving speed is set at 6 m/min.
After being uncoiled by an uncoiler, the glassine paper roll with the width of 0.3m passes through an electrostatic spinning receiving device (10) and is coiled on a coiling end.
The continuous assembly line type electrostatic spinning liquid supply device is positioned below a receiving device (10) of electrostatic spinning and is arranged perpendicular to the filter paper cloth moving direction; the width of the receiving device (10) for electrostatic spinning is 0.3m, and the length is 1.2 m.
Uniformly placing 7 liquid boxes (1) on a liquid box guide rail (3) along the filter paper cloth moving direction; the liquid box (1) is a liquid tank made of nylon materials, and a spinning roller (7) is horizontally arranged in the liquid box (1). The length of the liquid box (1) is 0.3m, the width is 0.1m, and the height is 0.1 m; one end of the liquid box (1) is provided with a high-voltage connecting sheet (6) which is composed of a spring steel sheet (13) and carbon black (14), and the high-voltage connecting sheet (6) guides external high-voltage electricity into the solution in the liquid box (1); two small grooves are arranged on the box walls at the two ends of the liquid box (1) and are used for supporting the spinning roller (7); the length of the spinning roller (7) is 0.4m, and the diameter is 60 mm; the spinning roller (7) is provided with a gear (8) at one end shaft head of the liquid box (1) without a high-pressure connecting sheet (6). The bottom of the liquid box (1) is provided with two grooves (9) for connecting the liquid box guide rails (3).
The liquid box guide rails (3) are two linear guide rails made of polytetrafluoroethylene, the length of the linear guide rails is 2m, the linear guide rails are placed along the cloth moving direction, and the linear guide rails are distributed on two sides of the working area in parallel and used for supporting the liquid box (1) and guiding the movement of the liquid box (1). The electrostatic spinning working area is positioned in the middle part of the guide rail (3); in the cloth feeding direction, the length of the linear guide rail in front of the working area is 0.4m and is called a liquid box loading area (11), and the length of the linear guide rail behind the working area is 0.4m and is called a liquid box unloading area (12).
6 liquid boxes are positioned in the working area; 1 liquid box is arranged in the liquid box loading area (11). The distance between each liquid box is 0.1 m; 4 liquid boxes are respectively filled with 1L of PVA aqueous solution, wherein the solid content of PVA is 10 wt%; 1L of HA and essence aqueous solution are respectively filled in the 3 liquid boxes, wherein the solid content of the HA essence is 1 wt% and 0.5 wt% respectively; the PVA solution and HA/essence solution are alternately placed in the liquid box.
The liquid box transmission device (2) comprises two liquid box transmission belts (20) with the length of 4.6m, a liquid box transmission driving shaft (16), a liquid box transmission driven shaft (17), a liquid box transmission driving connector (18) and a liquid box transmission driving motor (19); each liquid box conveyor belt (20) is provided with 23 liquid box stop blocks (15); the liquid box stop blocks (15) are uniformly distributed on the liquid box conveyor belt (20) along the conveying direction; two liquid box conveying belts (20) are arranged between the liquid box conveying driving shaft (16) and the liquid box conveying driven shaft (17); the distance between the liquid box stop blocks (15) on the same liquid box conveyor belt (20) is 0.2 m. The liquid box transmission driving shaft (16) is driven by a liquid box transmission driving motor (19) through a liquid box transmission driving connector (18).
At the beginning of spinning, two liquid box conveyor belts (20) move along the direction opposite to the direction of the glassine paper cloth feeding at the speed of 0.2 m/h. And under the action of the liquid box stop block (15), slowly conveying the 6 liquid boxes (1) in the working area to the liquid box unloading area (12). And simultaneously slowly conveying 1 liquid box (1) in the liquid box loading area (11) to the working area (11).
When the liquid box (1) is in the working area, the gear (8) on the spinning roller (7) in the liquid box (1) is meshed with the spinning roller conveyor belt (21) of the spinning roller driving device (4). The spinning roller rotating drive motor (24) drives the spinning roller conveyor belt (21) to move on the spinning roller conveyor belt support table (23) through the spinning roller rotating driver (22) to drive the spinning roller (7) to rotate at the speed of 5 r/min.
When the liquid box (1) is in a working area, the carbon black (14) on the spring steel sheet (13) is connected with a conductive electric stick with high voltage electricity (10), so that the solution in the liquid box (1) is charged with 55kV high voltage electricity to carry out electrostatic spinning.
Every 1 hour there will be one liquid box (1) to get into liquid box uninstallation district (12) from the workspace, and simultaneously a fresh liquid box (1) gets into the workspace from liquid box loading district (11), guarantees that there are 6 liquid boxes in the workspace all the time to guarantee the homogeneity of product.
The solution in the liquid box (1) entering the liquid box unloading area (12) is subjected to spinning for 6 hours, and the concentration and the property of the solution cannot meet the requirements of electrostatic spinning production due to the volatilization of solvent water.
After the liquid box (1) is conveyed to the liquid box unloading area (12), the gear (8) on the spinning roller (7) in the liquid box (1) is separated from the spinning roller conveyor belt (21) of the spinning roller driving device (4). The spinning roller (7) stops rotating.
After the liquid box (1) is conveyed to the liquid box unloading area (12), the carbon black (14) on the spring steel sheet (13) of the liquid box (1) is separated from the conductive electric stick (10), so that the liquid box (1) and the solution in the liquid box are disconnected from high voltage electricity. Thereby enabling the liquid cartridge (1) in the liquid cartridge unloading area (12) to be safely transported.
And 1 liquid box (1) in the liquid box unloading area (12) is taken down from the guide rail (3) for cleaning, replaced with the solution and placed in the liquid box loading area (11) again. Thereby realizing continuous production line type electrostatic spinning liquid supply.
The nanofiber mask is prepared by using the continuous production line type electrostatic spinning liquid supply device shown in fig. 1, uninterrupted production can be realized for 24 hours, and the shutdown caused by the change of the properties of the solution can be avoided.
The nanofiber facial mask is prepared by using the continuous assembly line type electrostatic spinning liquid supply device shown in fig. 1, and the spinning solution can be replaced on line, so that various nanofiber facial masks with different formulas can be conveniently produced.
The nanofiber mask is prepared by using the continuous assembly line type electrostatic spinning liquid supply device shown in fig. 1, and the liquid box is periodically cleaned and replaced, so that the maintenance period of the device is once every 2 months, and is longer than that of other electrostatic spinning devices.
It is contemplated that any portion of any aspect or any portion discussed in an embodiment herein may be implemented or combined with any portion or embodiment of any aspect or embodiment discussed herein.
One or more specific embodiments are described for purposes of illustration only. This description is presented for purposes of illustration and description, but is not intended to be exhaustive or limited to the form disclosed. It will be apparent to those skilled in the art that numerous variations and modifications can be made without departing from the scope of the claims set out below.
Claims (8)
1. A continuous assembly line type electrostatic spinning liquid supply device comprises: liquid box (1), liquid box conveyer (2), liquid box guide rail (3), spinning roller drive arrangement (4), high voltage power supply device (5), wherein: the liquid boxes (1) are positioned below the electrostatic spinning receiving device (10) and are arranged perpendicular to the base material cloth moving direction; a plurality of liquid boxes (1) are uniformly arranged on the liquid box guide rail (3) along the base material cloth moving direction; the liquid box (1) is driven by the liquid box conveying device (2) to move along the base material cloth moving direction or the direction opposite to the base material cloth moving direction; when the liquid box (1) moves forwards, the spinning roller driving device drives the spinning roller (7) in the liquid box (1) to rotate; when the liquid box (1) enters an electrostatic spinning working area, a high-voltage connecting sheet (6) on the liquid box (1) is communicated with a high-voltage power supply device (5), so that the solution in the liquid box (1) is charged with high voltage for electrostatic spinning; when the solution in the liquid box (1) is insufficient or the property of the solution is changed and cannot meet the production requirement along with the proceeding of electrostatic spinning, the liquid box (1) enters a liquid box unloading area (12), an old liquid box (1) is unloaded from a guide rail (3) in the liquid box unloading area (12), and a new liquid box is loaded on the guide rail (3) in a liquid box loading area (11), so that the continuous flow-line type electrostatic spinning liquid supply is realized.
2. The continuous production line type electrostatic spinning liquid supply device according to claim 1, characterized in that the liquid box (1) is a liquid tank made of insulating material, and a spinning roller (7) is horizontally arranged in the liquid box (1). The length of the liquid box (1) is 0.3-3m, the width is 0.1-0.3m, and the height is 0.1-0.3 m; one end of the liquid box (1) is provided with a high-voltage connecting sheet (6) which is composed of a spring steel sheet (13) and carbon black (14), and the high-voltage connecting sheet (6) guides external high-voltage electricity into the solution in the liquid box (1); two small grooves are arranged on the box walls at the two ends of the liquid box (1) and are used for supporting the spinning roller (7); the spinning roller (7) is provided with a gear (8) at one end shaft head without a high-pressure connecting sheet of the liquid box (1), and two grooves (9) are arranged at the bottom of the liquid box (1) and are used for connecting the liquid box guide rail (3).
3. The continuous flow line type electrostatic spinning liquid supply device according to claim 2, wherein the material of the liquid box (1) is an insulating material selected from polyformaldehyde, nylon, polytetrafluoroethylene, polyurethane, epoxy resin, polystyrene, polyethylene, polystyrene, polyvinyl chloride, perfluoropropylene; preferably, the liquid box (1) has a length of 0.3-2.1m, a width of 0.1-0.2m and a height of 0.1-0.2 m.
4. The continuous production line type electrostatic spinning liquid supply device according to claim 1, characterized in that the liquid box guide rails (3) are two linear guide rails, which are arranged along the cloth moving direction and distributed in parallel at two sides of the working area for supporting the liquid box (1) and guiding the movement of the liquid box (1). The electrostatic spinning working area is positioned in the middle part of the guide rail (3); in the cloth running direction, the guide rail before the working area is called a liquid box loading area (11), and the guide rail after the working area is called a liquid box unloading area (12).
5. The continuous production line type electrostatic spinning liquid supply device according to claim 1, characterized in that the liquid box transmission device (2) comprises two liquid box transmission belts (20), a plurality of liquid box stoppers (15), a liquid box transmission driving shaft (16), a liquid box transmission driven shaft (17), a liquid box transmission driving connector (18) and a liquid box transmission driving motor (19); the liquid box stop blocks (15) are uniformly distributed on the liquid box conveyor belt (20) along the conveying direction; two liquid box conveying belts (20) are arranged between the liquid box conveying driving shaft (16) and the liquid box conveying driven shaft (17); the distance between the liquid box stop blocks (15) on the same liquid box conveyor belt (20) is 0.2-0.5m, and the liquid box conveying driving shaft (16) is driven by a liquid box conveying driving motor (19) through a liquid box conveying driving connector (18).
6. The continuous production line type electrostatic spinning liquid supply device according to claim 1, characterized in that the liquid box transmission device (2) can adjust the moving direction and the moving speed of the transmission belt according to the requirements of the electrostatic spinning process, and the liquid box transmission device (2) can enable the liquid box (1) to pass through the electrostatic spinning working area at a constant speed and a variable speed.
7. The continuous production line type electrostatic spinning liquid supply device according to claim 1, characterized in that the spinning roller driving device (4) is composed of a spinning roller conveyor belt (21), a spinning roller rotation driving connector (22), a spinning roller conveyor belt supporting table (23) and a spinning roller rotation driving motor (24); the spinning roller conveyor belt (21) is a tooth-shaped conveyor belt and is meshed with a spinning roller gear (8) on a spinning roller (7) shaft; the spinning roller conveyor belt support table (23) plays a role of supporting the spinning roller conveyor belt (21) and simultaneously ensures the tight meshing of the spinning roller conveyor belt (21) and the spinning roller gear (8); the spinning roller conveyor belt (21) is driven by a spinning roller rotation driving motor (24) through a spinning roller rotation driving connector (22).
8. The continuous production line type electrostatic spinning liquid supply device according to claim 1, characterized in that the high voltage power supply device (5) is composed of a high voltage power supply, a high voltage wire and a conductive electric rod (10); the length of the conductive electric stick (10) is the same as that of the electrostatic spinning working area, and the conductive electric stick is placed on one side of the liquid box (1) with the high-voltage electric connection sheet (6) along the cloth moving direction; the conductive electric stick (10) is embedded in the insulating seat (25) and only leaks out of one surface facing the liquid box; the conductive electric stick (10) is connected with a high-voltage power supply through a high-voltage wire so as to bring high voltage; when the liquid box enters the working area, the carbon black (14) on the high-voltage connecting sheet (6) of the liquid box is contacted with the conductive electric stick (10) so as to form high voltage on the solution belt in the liquid box.
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