CN111926461A - Double-electrode high-voltage electrostatic spinning melt-blowing device - Google Patents
Double-electrode high-voltage electrostatic spinning melt-blowing device Download PDFInfo
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- CN111926461A CN111926461A CN202010875736.9A CN202010875736A CN111926461A CN 111926461 A CN111926461 A CN 111926461A CN 202010875736 A CN202010875736 A CN 202010875736A CN 111926461 A CN111926461 A CN 111926461A
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- 238000007664 blowing Methods 0.000 title claims abstract description 59
- 238000010041 electrostatic spinning Methods 0.000 title claims abstract description 28
- 239000000835 fiber Substances 0.000 claims abstract description 49
- 239000004020 conductor Substances 0.000 claims abstract description 18
- 229920001342 Bakelite® Polymers 0.000 claims description 41
- 239000004637 bakelite Substances 0.000 claims description 41
- 239000004677 Nylon Substances 0.000 claims description 27
- 229920001778 nylon Polymers 0.000 claims description 27
- 230000005684 electric field Effects 0.000 claims description 23
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 10
- 229910052802 copper Inorganic materials 0.000 claims description 10
- 239000010949 copper Substances 0.000 claims description 10
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 claims description 9
- 229910052750 molybdenum Inorganic materials 0.000 claims description 9
- 239000011733 molybdenum Substances 0.000 claims description 9
- 230000003068 static effect Effects 0.000 claims description 9
- 230000005611 electricity Effects 0.000 claims description 7
- 239000000155 melt Substances 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 5
- -1 polytetrafluoroethylene Polymers 0.000 claims description 4
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 3
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 3
- 230000005686 electrostatic field Effects 0.000 abstract description 12
- 238000009826 distribution Methods 0.000 abstract description 10
- 238000005265 energy consumption Methods 0.000 abstract description 5
- 229920005594 polymer fiber Polymers 0.000 abstract description 5
- 230000032683 aging Effects 0.000 abstract description 4
- 238000000034 method Methods 0.000 description 19
- 238000001914 filtration Methods 0.000 description 10
- 239000012528 membrane Substances 0.000 description 9
- 238000004519 manufacturing process Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 5
- 230000009286 beneficial effect Effects 0.000 description 4
- 230000014759 maintenance of location Effects 0.000 description 4
- 229920000642 polymer Polymers 0.000 description 4
- 238000002360 preparation method Methods 0.000 description 4
- 230000033228 biological regulation Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000004744 fabric Substances 0.000 description 3
- 230000010287 polarization Effects 0.000 description 3
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 239000002121 nanofiber Substances 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 239000013618 particulate matter Substances 0.000 description 2
- 238000007670 refining Methods 0.000 description 2
- 238000009987 spinning Methods 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 241000711573 Coronaviridae Species 0.000 description 1
- 206010035664 Pneumonia Diseases 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- 239000000443 aerosol Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000002354 daily effect Effects 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 230000003203 everyday effect Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000009827 uniform distribution Methods 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
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- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
- D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
- D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
- D04H1/54—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties by welding together the fibres, e.g. by partially melting or dissolving
- D04H1/56—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties by welding together the fibres, e.g. by partially melting or dissolving in association with fibre formation, e.g. immediately following extrusion of staple fibres
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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
- D01D5/0092—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
-
- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
- D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
- D04H1/70—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres characterised by the method of forming fleeces or layers, e.g. reorientation of fibres
- D04H1/72—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres characterised by the method of forming fleeces or layers, e.g. reorientation of fibres the fibres being randomly arranged
- D04H1/728—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres characterised by the method of forming fleeces or layers, e.g. reorientation of fibres the fibres being randomly arranged by electro-spinning
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- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Mechanical Engineering (AREA)
- Spinning Methods And Devices For Manufacturing Artificial Fibers (AREA)
Abstract
The invention discloses a double-electrode high-voltage electrostatic spinning melt-blowing device which mainly comprises a melt-blowing die head support frame, a melt-blowing upper die head, a melt-blowing lower die head, a shuttle-shaped electrode plate, an electrode plate conductor sheet, a support frame adjusting nut, an air bellow adjusting nut, an air suction bellow and a porous electrode plate, wherein the melt-blowing die head support frame is used for supporting and fixing the melt-blowing upper die head, the melt-blowing lower die head and the shuttle-shaped electrode plate; high-voltage electrostatic field force is applied between the melt-blown upper die head and the shuttle-shaped electrode plate, high-voltage electrostatic field force is applied between the shuttle-shaped electrode plate and the porous electrode plate, and the high-voltage electrostatic field force twice is used as auxiliary acting force to draft and refine the fibers, so that the diameter size and distribution of the polymer fibers are reduced. Before the fiber is solidified, the fiber is polarized by the double-electrode high-voltage electrostatic field, charges can be kept in the fiber layer for a long time, and the dipole performance of the fiber is long. The application of the double electrodes simultaneously solves the problems of thick fiber diameter, wide diameter distribution range, large energy consumption and short dipole property aging.
Description
Technical Field
The invention relates to a double-electrode high-voltage electrostatic spinning melt-blowing device, belonging to the field of spinning equipment.
Background
Influenced by novel coronavirus pneumonia, a large amount of disposable masks and N95 masks required by resident daily protection are in short supply, the selling price of the N95 mask is up to 80 yuan/piece once, the price of the inner layer melt-blown cloth serving as a mask protection core is not in demand, the price is increased to 60-80 yuan/piece suddenly from 2-3 yuan/piece every day, a large amount of capital is injected into the melt-blown cloth industry, but the prepared melt-blown cloth has poor toughness, a large number of crystal grains and lower filtering efficiency than the national standard.
The spinning processing method is a manufacturing method of polymer micro-nano fibers and mainly comprises a melt-blowing method, an electrostatic spinning method and the like. Different preparation techniques have respective advantages and limitations. The melt-blowing method has the advantages of high production efficiency and simple process flow, but the fiber cannot be thinned to the nanometer level only by the friction force between the airflow and the polymer melt jet, so the diameter of the polymer fiber produced by the melt-blowing method is 2-5 mu m, the thickness of the fiber prepared by the melt-blowing method is not beneficial to improving the filtration efficiency of 0.3 mu m air suspended particles from 95% to 100%, and in the process of preparing the fiber by the melt-blowing method, after the fiber falls on a collection plane, the solidified fiber film is charged and polarized. Since the fiber membrane produced by the method is subjected to charge polarization after the fiber is solidified, the charge retention time in the fiber membrane is short, and the dipole retention time of the fiber membrane is short. The electrostatic spinning method utilizes an electrostatic field to enable polymer melt to overcome surface tension to form Taylor cone excited jet flow, fiber diameter formed after solidification and cooling is between tens of nanometers and hundreds of nanometers, and the electrostatic spinning method has excellent filtering effect on suspended particles in air, but production efficiency is low, and batch preparation requirements are difficult to meet, so that the fiber preparation process combining the melt-blowing method and the electrostatic spinning method can meet double requirements of batch preparation and high filtering efficiency.
Therefore, aiming at the problems of thick diameter, uneven diameter distribution, high production energy consumption and low dipole property aging of a fiber membrane of the polymer fiber prepared by the existing melt-blowing method, the invention proposes the melt-blowing device for the double-electrode high-pressure electrostatic spinning, which can effectively reduce the diameter of the fiber, reduce the diameter distribution range, reduce the production energy consumption, increase the retention time of the dipole property of the fiber and be beneficial to long-term storage.
Disclosure of Invention
The invention provides a melt-blowing device for double-electrode high-pressure electrostatic spinning, aiming at the problems of thick diameter, uneven diameter distribution, high production energy consumption and low dipole property aging of a fiber membrane of a polymer prepared by a melt-blowing method. The addition of the double-electrode high-voltage static realizes the great reduction of the fiber diameter, the nano fiber with the average diameter of less than 1 mu m can be prepared, and the fiber lapping uniformity and the flatness are increased; the polymer fibers are refined by the aid of the airflow stretching force assisted by the double-electrode high-voltage electrostatic field force, so that the diameter distribution range of the produced fibers is also reduced; the use power consumption of the air box and the airflow auxiliary equipment can be greatly reduced by adding the double-electrode high-voltage electrostatic field force; in the falling process of the fiber, the double-electrode high-voltage electrostatic field force performs electric field polarization on the fiber twice, and the dipole polarization holding time of the produced fiber membrane is greatly increased.
The invention provides a double-electrode high-voltage electrostatic spinning melt-blowing device which mainly comprises a melt-blowing die head support frame, a melt-blowing upper die head, a melt-blowing lower die head, a shuttle-shaped electrode plate, an electrode plate conductor sheet, a support frame adjusting nut, an air box adjusting nut, an air suction air box and a porous electrode plate, wherein the melt-blowing upper die head comprises two gas flow channels and a melt flow channel; the lower melt-blown die head comprises two gas flow channels; the melt-blown die head support frame is used for supporting and fixing the melt-blown upper die head, the melt-blown lower die head and the shuttle-shaped electrode plate; the support frame adjusting nut is used for adjusting the height of the shuttle-shaped electrode plate; the electrode plate conductor sheets are fixed on two sides of the shuttle-shaped electrode plate; the porous electrode plate is arranged on the top end face of the air suction bellows; the air box adjusting nut is used for adjusting the height of the suction air box from the ground.
The invention relates to a double-electrode high-voltage electrostatic spinning melt-blowing device. The two electrode plate conductor sheets are respectively fixed on two sides of the two shuttle-shaped copper electrode plates by utilizing screws and are used for conducting the two shuttle-shaped copper electrode plates, so that the same potential difference is kept between the two shuttle-shaped copper electrode plates and the melt-blown die head. The waist hole in the middle of the electrode plate conductor sheet is used for moving the set screw when the shuttle-shaped electrode plate is adjusted. High-voltage static electricity is applied between the lower melt-blown die head and the shuttle-shaped electrode plate for first-stage electric field force to draw and thin the fibers, and the applied voltage range is 5-60kV, and the preferred voltage range is 20-35 kV. The distance between the melt-blown upper die head and the shuttle-shaped electrode plate can be adjusted according to the voltage value, the adjustment mode is that the adjustment is carried out through a support frame adjusting nut on a support frame of the melt-blown die head, the adjustment range is 10-60mm, and the preferred range is 20-35 mm. The distance between the two shuttle-shaped electrode plates can be controlled by adjusting and loosening the two set screws to horizontally slide along the waist holes of the conductor sheets of the electrode plates, and the adjustment range is 20mm-60mm, and the preferred range is 30mm-50 mm. Because the electrode plate conductor bars are fixed on the two sides of the two shuttle-shaped electrode plates, the distribution of the electric field intensity between the melt-blown lower die head and the shuttle-shaped electrode plates is not disturbed, and the uniform distribution of the electric field intensity is beneficial to improving the fiber fineness. The upper and lower tips of the two shuttle-shaped electrode plates and the upper melt-blown die head form a strong space electric field, which is beneficial to drafting and refining fibers. Polytetrafluoroethylene is uniformly coated on the inner plane of the electrode plates, and the excellent electrical insulating property of the polytetrafluoroethylene weakens the adsorption capacity of the electrode plates, so that fibers can quickly pass through the gap between the two shuttle-shaped electrode plates and are not adhered to the shuttle-shaped electrode plates.
The invention relates to a double-electrode high-voltage electrostatic spinning melt-blowing device.A porous electrode plate is arranged on the top end surface of a wind suction bellows; high-voltage static electricity is applied between the shuttle-shaped electrode plate and the porous electrode plate for drafting the refined fibers by the second electric field force, and the applied voltage range is 80kV to 160kV, and the preferred voltage range is 100kV to 120 kV. The distance between the shuttle-type electrode plate and the porous electrode plate is adjusted according to the voltage value by adjusting a bellows adjusting nut of a suction air bellows, and the adjusting range is 150mm-250mm, preferably 180mm-220 mm. Open the array mesh on the porous electrode board, mesh on the porous electrode board does not influence its supporting role to the fibrous layer, and the fibre can adsorb more electric charges owing to receive the effect of electric field force in the in-process that falls down, can adsorb on it fast when falling to the porous electrode board on, piles up the fibrous layer on the porous electrode board and can adsorb on the electrode board, and this method can reduce the power loss of suction wind bellows. The suction bellows is used to absorb the fibers on the collection plane, which is the porous electrode plate.
According to the melt-blowing device for the double-electrode high-voltage electrostatic spinning, disclosed by the invention, high-voltage electrostatic field force is applied between the melt-blowing upper die head and the shuttle-type electrode plate, high-voltage electrostatic field force is applied between the shuttle-type electrode plate and the porous electrode plate, and the high-voltage electrostatic field force is used for drafting and refining fibers twice as a main acting force, so that the diameter size and distribution of polymer fibers are greatly reduced. Before the fiber is solidified, the fiber is polarized by the double-electrode high-voltage electrostatic field, charges can be kept in the fiber layer for a long time, and the dipole performance of the fiber is long. The application of the double electrodes simultaneously solves the problems of thick fiber diameter, wide diameter distribution range, large energy consumption and short dipole property aging.
According to the double-electrode high-voltage electrostatic spinning melt-blowing device, the primary electrode plate can also be in a 7-shaped structure, and the point discharge effect is more obvious. In order to create a primary electric field environment between the 7-shaped electrode plate and the melt-blown lower die head, the bolt and the support piece are made of nylon and bakelite materials respectively. Melt and spout vertical direction and adjust bakelite support and be fixed in melt through nylon fastening bolt and spout the upper die head, and height-adjusting nylon bolt passes vertical direction and adjusts bakelite support, and the nylon screw is fixed in horizontal direction with "7" type plate electrode and adjusts bakelite support internal thread hole cooperation. The bakelite air bellow is arranged about 150mm below the tip end of the lower melt-blown die head, and the central opening is convenient for the arrangement of the array mesh electrode plate.
According to the double-electrode high-voltage electrostatic spinning melt-blowing device, the primary electrode plate can also be of a filamentous structure. The bakelite air box is characterized in that two bakelite strips with waist holes are fixed on the side faces of a bakelite air box through M10 nylon fastening bolts, molybdenum wires for two electret electrodes are wound on M10 nylon bolts and are fixedly connected with the bakelite strips with the waist holes through nuts, holes of the bakelite air box are threaded holes and are matched with the M10 nylon fastening bolts, the molybdenum wires for the two electret electrodes and a melt-blown lower die head form a primary electric field, an array mesh electrode plate and the melt-blown lower die head form a secondary electric field, the molybdenum wires for the electret electrodes are located about 10-60mm, preferably 20-30mm below the melt-blown lower die head, the applied voltage is 5-60kV, preferably 20-35kV, the bakelite air box is located about 150mm below the tip of the melt-blown lower die head, the central opening is convenient for placing the array mesh electrode plate, and the applied voltage range is 80kV to 160kV, preferably 100kV to 120.
Drawings
FIG. 1 is a schematic diagram of a dual electrode high pressure electrostatic spinning melt blowing apparatus of the present invention;
FIG. 2 is an enlarged schematic view of the meltblowing die shown in FIG. 1;
FIG. 3 is a three-dimensional schematic view of the shuttle-type electrode plate shown in FIG. 1;
FIG. 4 is a top view of the porous electrode plate shown in FIG. 1;
FIG. 5 is a partial schematic view of a "7" type electrode plate arrangement;
FIG. 6 is an axial cross-sectional view of a "7" type electrode plate arrangement;
FIG. 7 is an axial schematic view of a wire electrode assembly.
In the figure: 1-melt blowing die head support; 2-melt-spraying the upper die head; 2-1-upper die head gas flow passage; 2-2-melt channel; 3-melt blowing lower die; 3-1-lower die head gas flow channel; 4-shuttle-type electrode plates; 5-electrode plate conductor sheet; 6-support frame adjusting nut; 7-bellows adjusting nut; 8-a suction air box; 9-a porous electrode plate; 10-adjusting height nylon bolts; 11-nylon fastening bolts; 12-vertically adjusting the bakelite rack; 13-adjusting the width of the nylon bolt; 14-horizontally adjusting the bakelite bracket; 15-array mesh electrode plate; 16-bakelite bellows; 17-nylon bolts; 18-supporting the bakelite board; 19- "7" type electrode plate; 20-electric wood strips with waist holes; 21-M10 nylon fastening bolts; 22-molybdenum wire; 23-nut.
Detailed Description
The invention provides a double-electrode high-voltage electrostatic spinning melt-blowing device. As shown in fig. 1, the melt-blowing device mainly comprises a melt-blowing die head support frame 1, a melt-blowing upper die head 2, a melt-blowing lower die head 3, a shuttle-shaped electrode plate 4, an electrode plate conductor sheet 5, a support frame adjusting nut 6, a bellows adjusting nut 7, a suction air bellows 8 and a porous electrode plate 9. The melt-spraying upper die head 2 comprises an upper die head gas runner 2-1 and a melt runner 2-2; the lower melt-blown die comprises a lower die gas channel 3-1. The melt-blown die head support frame 1 is used for supporting and fixing a melt-blown upper die head 2, a melt-blown lower die head 3 and a shuttle-shaped electrode plate 4; the support frame adjusting nut 6 is used for adjusting the height of the shuttle-shaped electrode plate 4; the electrode plate conductor sheets 5 are fixed on two sides of the shuttle-shaped electrode plate 4 by screws; the porous electrode plate 9 is arranged on the top end face of the air suction box 8; the air box adjusting nut 7 is used for adjusting the height of the air suction air box 8 from the ground.
In the production process of the melt-blowing equipment, as shown in an enlarged schematic diagram of a melt-blowing die head of FIG. 2, an upper melt-blowing die head 2 and a lower melt-blowing die head 3 are connected by bolts and are tightly attached without flash. The upper die head gas flow passage 2-1 and the lower die head gas flow passage 3-1 jointly form a left side gas flow passage and a right side gas flow passage. The gas flow channels on the two sides are used for drafting refined fibers together. The melt runner 2-2 is used for flowing out the melted and plasticized materials.
Fig. 3 is a three-dimensional schematic diagram of a shuttle-type electrode plate. As shown, a shuttle-type electrode plate 4 is placed on a melt-blowing die holder 1. The electrode plate conductor piece 5 is fixed in the waist hole below the two shuttle-shaped electrode plates 4 by a set screw and is used for connecting the two shuttle-shaped electrode plates 4. The electrode plate conductor tabs 5 are placed on both sides of the shuttle-type electrode plate 4 without interfering with the electric field intensity. High-voltage static electricity is applied between the lower melt-blown die head 3 and the shuttle-type electrode plate 4 for primary electric field force to draw and thin the refined fibers, and the applied voltage range is 5kV to 60kV, and the preferred voltage range is 20kV to 35 kV. The distance between the melt-blowing upper die head 2 and the shuttle-shaped electrode plate 4 can be adjusted according to the voltage value, the adjustment mode is that the adjustment is carried out through a support frame adjusting nut 6 on a support frame 1 of the melt-blowing die head, the adjustment range is 10mm to 60mm, and the optimal range is 20mm to 35 mm. The slit distance between the shuttle-shaped electrode plates 4 can be adjusted according to the voltage value, the adjustment mode is that the slit distance between two shuttle-shaped electrode plates 4 is horizontally moved and adjusted, after the adjustment is finished, the slit distance is fixed by using a set screw on the electrode plate conductor sheet, the set screw can move along the direction of the electrode plate conductor sheet, and the adjustment range is 20mm to 60mm, preferably 30mm to 50 mm. A porous electrode plate 9 is arranged on the top end face of the air suction box 8, as shown in figure 4; high-voltage static electricity is applied between the shuttle-type electrode plate 4 and the porous electrode plate 9 for the second electric field force to draft the refined fibers, and the applied voltage range is 80kV to 160kV, and preferably 100kV to 120 kV. The distance between the shuttle-type electrode plate 4 and the porous electrode plate 9 is adjusted according to the voltage value by the bellows adjusting nut 7 of the suction air bellows 8 in a range of 150mm to 250mm, preferably 180mm to 220 mm.
The primary electrode plate can be changed into a 7 shape, as shown in fig. 5 and 6, and the tip end pointing effect is more obvious. In order to create a primary electric field environment between the 7-shaped electrode plate and the melt-blown lower die head, the bolt and the support piece are made of nylon and bakelite materials respectively. Vertical direction regulation bakelite support 12 is fixed in melt-blown upper die head 2 through nylon fastening bolt 11, height-adjusting nylon bolt 10 and width-adjusting nylon bolt 13 adjust vertical direction regulation bakelite support 12, horizontal direction regulation bakelite support 14, support bakelite plate 18 and link together and can adjust the difference in height between two "7" type plate electrodes 19 interval, "7" type plate electrode 19 and the melt-blown lower bolster 3, two "7" type plate electrode 19 interval control range is 0-100mm, preferred scope is: 30-60mm, and the distance between the two 7-shaped electrode plates 19 and the tip of the lower melt-blown die head 3 is adjusted within the range of 30-70 mm, preferably within the range of 30-50 mm. The nylon screw 17 fixes the 7-shaped electrode plate 19 on the horizontal adjusting bakelite bracket 14 and is matched with the threaded hole in the horizontal adjusting bakelite bracket 14. An bakelite air box 16 is placed about 150mm below the tip of the lower melt-blown die 3, with a central opening to facilitate placement of an array mesh electrode plate 15, applied at a voltage in the range of 80kV to 160kV, preferably in the range of 100kV to 120 kV.
The primary electrode plate may also be a filiform structure, as shown in fig. 7. Two bakelite strips 20 with waist holes are fixed on the side surfaces of the bakelite air box 16 through M10 nylon fastening bolts 21, two molybdenum wires 22 for electret are wound on the M10 nylon fastening bolts 21 and are fixedly connected with the bakelite strips 20 with waist holes through nuts 23, the holes of the bakelite air box 16 are threaded holes, the two electret molybdenum wires 22 and the melt-blown lower die head 3 form a primary electric field, the array mesh electrode plate 15 and the melt-blown lower die head 3 form a secondary electric field, the electret molybdenum wires 22 are positioned about 10-60mm, preferably 20-30mm below the melt-blown lower die head 3, the applied voltage is 5-60kV, preferably 20-35kV, the bakelite air box 16 is positioned about 150mm below the tip end of the melt-blown lower die head 3, the center is provided with a hole for facilitating the placement of the array mesh electrode plate 15, the voltage range applied is 80kV to 160kV, and the preferred voltage range is 100kV to 120 kV.
Example of the implementation
Use particulate matter filtration efficiency tester to carry out filtration membrane test to sodium chloride aerosol, add the supplementary back that refines of high-voltage static, fibre filtration membrane all has obvious promotion to the filter effect of different diameter particulate matters. The detection result shows that the average fiber diameter is reduced from 2-5 μm to 1-2 μm (the minimum detection diameter is 628nm) after the double-electrode high-voltage static electricity is added; the fiber diameter distribution range is reduced by as much as two times; the filtration efficiency after the electret treatment is improved by 10 percent, and the filtration efficiency without the electret treatment is improved by about 4 percent; for example, the filtering efficiency of PM0.3 particulate matter is improved from 97% to 99.97%. Through calculation, the power loss of the air suction box and the airflow auxiliary equipment is reduced by about 1 kilowatt per hour; the retention time of the dipole property of the fiber membrane increases by about 90 days.
Experimental parameters: a polypropylene material with a melt index of 1800g/10 min; the heating temperature of the melt-blowing die head is 240 ℃; the temperature of hot air flow is 245 ℃; the flow velocity of the air flow is 10m 3/h; the flow velocity of the suction wind airflow is 28m 3/h; the lapping speed is 18 m/min; the voltage of the primary electric field is 30kV, and the voltage of the secondary electric field is 100 kV; the distance between the primary electrode plate and the melt-blowing die head is 35mm, and the distance between the secondary electrode plate and the melt-blowing die head is 150 mm; the horizontal distance between the two electrode plates of the primary electric field is 50 mm.
Claims (10)
1. A double-electrode high-voltage electrostatic spinning melt-blowing device is characterized in that: the device mainly comprises a melt-blown die head support frame, a melt-blown upper die head, a melt-blown lower die head, a shuttle-shaped electrode plate, an electrode plate conductor sheet, a support frame adjusting nut, an air box adjusting nut, an air suction air box and a porous electrode plate, wherein the melt-blown upper die head comprises two gas flow channels and a melt flow channel; the lower melt-blown die head comprises two gas flow channels; the melt-blown die head support frame is used for supporting and fixing the melt-blown upper die head, the melt-blown lower die head and the shuttle-shaped electrode plate; the support frame adjusting nut is used for adjusting the height of the shuttle-shaped electrode plate; the electrode plate conductor sheets are fixed on two sides of the shuttle-shaped electrode plate; the porous electrode plate is arranged on the top end face of the air suction bellows; the air box adjusting nut is used for adjusting the height of the suction air box from the ground.
2. The melt-blowing device of the double-electrode high-voltage electrostatic spinning according to claim 1, characterized in that: the shuttle-shaped electrode plates are composed of two shuttle-shaped copper electrode plates, are vertically placed on the melt-blown die head support frame, and the two electrode plate conductor sheets are respectively fixed on the two sides of the two shuttle-shaped copper electrode plates by screws and are used for conducting the two shuttle-shaped copper electrode plates so that the two shuttle-shaped copper electrode plates keep the same voltage; the narrow gap between the electrode plate conductor sheets is used for moving the set screw when adjusting the shuttle-type electrode plate.
3. The melt-blowing device of the double-electrode high-voltage electrostatic spinning according to claim 1, characterized in that: the shuttle-shaped electrode plate is replaced by a 7-shaped electrode plate or a filiform electrode.
4. The melt-blowing device of the double-electrode high-voltage electrostatic spinning according to claim 1, characterized in that: applying high-voltage static electricity between the melt-blown lower die head and the shuttle-shaped electrode plate for drafting the refined fibers by primary electric field force, wherein the applied voltage range is 20-35 kV; high-voltage static electricity is applied between the shuttle-shaped electrode plate and the porous electrode plate for secondary electric field force to draw the refined fibers, and the applied voltage range is 80-160kV, and is preferable.
5. The melt-blowing device of the double-electrode high-voltage electrostatic spinning according to claim 1, characterized in that: the distance between the melt-blown upper die head and the shuttle-shaped electrode plate is adjusted according to the voltage value, the adjustment mode is that the adjustment is carried out through a support frame adjusting nut on a support frame of the melt-blown die head, and the adjustment range is 20-35 mm.
6. The melt-blowing device of the double-electrode high-voltage electrostatic spinning according to claim 1, characterized in that: the inner side planes of the electrode plates are coated with polytetrafluoroethylene.
7. The melt-blowing device of the double-electrode high-voltage electrostatic spinning according to claim 1, characterized in that: the porous electrode plate is provided with an array mesh.
8. The melt-blowing device of the double-electrode high-voltage electrostatic spinning according to claim 1, characterized in that: the distance between the shuttle-type electrode plate and the porous electrode plate is adjusted according to the voltage value by adjusting a bellows adjusting nut of a suction air bellows, and the adjusting range is 150-250mm, and the preferable range is 180-220 mm.
9. The melt-blowing device of the double-electrode high-voltage electrostatic spinning according to claim 1, characterized in that: the primary electrode plate is of a 7-shaped structure, and the bolt and the support piece are made of nylon and bakelite materials respectively; the bakelite support is adjusted to vertical direction is fixed in through nylon fastening bolt and melts and spouts the upper die head, height adjusting nylon bolt and width adjusting nylon bolt adjust the bakelite support with vertical direction, horizontal direction adjusts the bakelite support, support the bakelite plate and link together and can adjust two "7" type copper intervals, "7" type copper and melt and spout the difference in height between the die head down, the nylon screw will "7" type copper be fixed in horizontal direction and adjust the bakelite support, the bakelite bellows is arranged in and is melted about 150mm department below the die head most advanced, the central trompil is convenient for placing of array mesh plate electrode.
10. The melt-blowing device of the double-electrode high-voltage electrostatic spinning according to claim 1, characterized in that: the first-stage electrode plate is of a filamentous structure, two bakelite strips with waist holes are fixed on the side face of a bakelite air box through M10 nylon fastening bolts, molybdenum wires for two electret electrodes are wound on M10 nylon bolts and are fixedly connected with the bakelite strips with the waist holes through nuts, holes of the bakelite air box are threaded holes and are matched with the M10 nylon fastening bolts, the two electret molybdenum wires and a melt-blown lower die head form a first-stage electric field, the array mesh electrode plate and the melt-blown lower die head form a second-stage electric field, the electret molybdenum wires are located 20-30mm below the melt-blown lower die head, the applied voltage is 20-35kV, the bakelite air box is arranged 150mm below the tip end of the melt-blown lower die head, the center of the bakelite air box is provided with a hole for facilitating the arrangement of the array mesh electrode plate.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110295398A (en) * | 2018-03-22 | 2019-10-01 | 松下知识产权经营株式会社 | The manufacturing method of electric spinning device and fiber assembly |
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