CN110965137A - A kind of negative pressure multi-jet subdivision centrifugal electrospinning device and using method thereof - Google Patents
A kind of negative pressure multi-jet subdivision centrifugal electrospinning device and using method thereof Download PDFInfo
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- CN110965137A CN110965137A CN202010055166.9A CN202010055166A CN110965137A CN 110965137 A CN110965137 A CN 110965137A CN 202010055166 A CN202010055166 A CN 202010055166A CN 110965137 A CN110965137 A CN 110965137A
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- 238000000034 method Methods 0.000 title claims abstract description 22
- 238000001523 electrospinning Methods 0.000 title claims abstract 12
- 238000009987 spinning Methods 0.000 claims abstract description 69
- 239000007788 liquid Substances 0.000 claims abstract description 45
- 239000002121 nanofiber Substances 0.000 claims abstract description 23
- 239000002184 metal Substances 0.000 claims abstract description 22
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 14
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 13
- 229920000642 polymer Polymers 0.000 claims abstract description 10
- 230000005540 biological transmission Effects 0.000 claims abstract description 6
- 239000012792 core layer Substances 0.000 claims abstract description 6
- 238000001802 infusion Methods 0.000 claims abstract 3
- 239000000835 fiber Substances 0.000 claims description 34
- 238000003860 storage Methods 0.000 claims description 21
- 238000001125 extrusion Methods 0.000 claims description 17
- 229920002239 polyacrylonitrile Polymers 0.000 claims description 12
- 239000012528 membrane Substances 0.000 claims description 11
- ZMXDDKWLCZADIW-UHFFFAOYSA-N N,N-Dimethylformamide Chemical compound CN(C)C=O ZMXDDKWLCZADIW-UHFFFAOYSA-N 0.000 claims description 9
- 230000009471 action Effects 0.000 claims description 8
- 230000005611 electricity Effects 0.000 claims description 5
- 230000008569 process Effects 0.000 claims description 5
- 239000000843 powder Substances 0.000 claims description 3
- 238000003756 stirring Methods 0.000 claims description 3
- 239000002245 particle Substances 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 5
- 239000010410 layer Substances 0.000 abstract description 3
- 230000008878 coupling Effects 0.000 abstract 2
- 238000010168 coupling process Methods 0.000 abstract 2
- 238000005859 coupling reaction Methods 0.000 abstract 2
- JJLJMEJHUUYSSY-UHFFFAOYSA-L Copper hydroxide Chemical compound [OH-].[OH-].[Cu+2] JJLJMEJHUUYSSY-UHFFFAOYSA-L 0.000 abstract 1
- 238000012824 chemical production Methods 0.000 abstract 1
- 239000011810 insulating material Substances 0.000 abstract 1
- 238000010041 electrostatic spinning Methods 0.000 description 22
- 238000001179 sorption measurement Methods 0.000 description 6
- 238000002360 preparation method Methods 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 210000001503 joint Anatomy 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
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- VYQRBKCKQCRYEE-UHFFFAOYSA-N ctk1a7239 Chemical compound C12=CC=CC=C2N2CC=CC3=NC=CC1=C32 VYQRBKCKQCRYEE-UHFFFAOYSA-N 0.000 description 1
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- 238000011031 large-scale manufacturing process Methods 0.000 description 1
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- 239000002994 raw material Substances 0.000 description 1
- 238000001878 scanning electron micrograph Methods 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
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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
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Textile Engineering (AREA)
- Spinning Methods And Devices For Manufacturing Artificial Fibers (AREA)
Abstract
本发明属于静电纺丝领域，特别是指一种负压多射流细分式离心静电纺丝装置及其使用方法。包括高速旋转电机、传动装置、装置支撑架、高压发生器、负压作用的接收装置和供液装置，还包括喷丝装置。供液装置通过输液管与喷丝器相接，喷丝器与外层为有绝缘材质芯层为金属的联轴器相连，联轴器与传送带与高速电机对接，有效的避开了喷丝器施加高压后，对旋转电机造成的影响。高压发生器的正极通过碳刷磨擦传电与联接轴相连、负极与接收装置相连。本发明在传统的静电纺丝上，施加离心力的作用，利用离心力和静电力共同拉伸聚合物溶液，采用狭缝式细分射流喷丝器，不仅可以纺出均匀的纳米纤维，更可以批量化生产纳米纤维。
The invention belongs to the field of electrospinning, in particular to a negative pressure multi-jet subdivision centrifugal electrospinning device and a use method thereof. It includes a high-speed rotating motor, a transmission device, a device support frame, a high-voltage generator, a receiving device for negative pressure, a liquid supply device, and a spinning device. The liquid supply device is connected with the spinneret through the infusion tube, and the spinneret is connected with the coupling whose outer layer is made of insulating material and the core layer is metal. The coupling is connected with the conveyor belt and the high-speed motor, which effectively avoids the spinning After the high voltage is applied to the device, the effect on the rotating electrical machine is caused. The positive pole of the high-voltage generator is connected to the connecting shaft through the frictional transmission of carbon brushes, and the negative pole is connected to the receiving device. In the traditional electrospinning, the present invention exerts the effect of centrifugal force, utilizes centrifugal force and electrostatic force to jointly stretch the polymer solution, and adopts a slit-type subdivided jet spinneret, which can not only spin out uniform nanofibers, but also produce batches of nanofibers. chemical production of nanofibers.
Description
Technical Field
The invention belongs to the field of electrostatic spinning, and particularly relates to a negative-pressure multi-jet subdivision type centrifugal electrostatic spinning device and a using method thereof.
Background
With the continuous requirement of life quality and the aggravation of environmental pollution, the nanofiber can be used in various fields such as waterproof moisture permeability, air filtration, energy storage and the like due to the advantages of extremely fine diameter, large specific surface area, high porosity and the like. Electrostatic spinning is considered to be one of the most effective methods for preparing nanofibers, the preparation method is simple and low in cost, but mass production of the nanofibers is always a difficult problem, and the nanofibers prepared by electrostatic spinning have poor orientation degree and low production efficiency, so that large-scale production of the nanofibers is limited. The centrifugal spinning method is a traditional method for preparing fibers, centrifugal force and shearing force generated by a high-speed rotating device are utilized to promote polymer melt or solution to be thrown out from fine holes to form fibers, the spinning efficiency is high, the fiber orientation degree of the prepared fiber membrane is high, but the diameter of the prepared fibers is large. The advantages of the two technologies are combined, the fineness of the nano fibers can be effectively reduced while the spinning efficiency is improved, the fiber arrangement is neat, the orientation degree is good, the mechanical property is excellent, and meanwhile, the spinning raw materials are diversified.
Most of centrifugal electrostatic spinning nozzles adopt shuttle-shaped or cylindrical nozzles, and common needles are used as spinning nozzles, so that the yield of the nanofibers can be properly increased while the fineness of the fibers is ensured. However, because of the limited number of needle arrangements, the further improvement of the yield is limited from another aspect, for example, the centrifugal spinning method mentioned in patent CN 106521808A. In addition to the centrifugal spinning nozzles with nozzles, nozzle-less centrifugal electrostatic spinning nozzles have been developed and improved by researchers in recent years, and include slit spinnerets, screen spinnerets, and the like. The spinning nozzle is characterized by high yield, but uneven thickness of fiber and unclear gradation of fiber structure. The invention aims to combine a slit type spinning nozzle and a screen mesh type to perform jet flow subdivision and refinement treatment on the basis of centrifugal electrostatic spinning, and ensures the diameter uniformity of fibers while realizing high-efficiency spinning so as to realize continuous high-yield nanofiber preparation.
Disclosure of Invention
In order to solve the technical problems, the invention provides a negative-pressure multi-jet subdivision type centrifugal electrostatic spinning device and a using method thereof. The invention introduces centrifugal force on the basis of the traditional electrostatic spinning, increases the traction force to polymer jet flow under the combined action of the centrifugal force and the electrostatic force, and stretches to form the nano fiber, thereby solving the problems of batch production and application of the nano fiber.
The technical scheme of the invention is realized as follows:
a negative pressure multi-jet flow subdivision type centrifugal electrostatic spinning device comprises a liquid storage tank, a liquid supply pump, a spinneret device, a power device, a high pressure generating device and a negative pressure receiving device, wherein the negative pressure receiving device comprises a semi-closed cavity and a metal receiving net, negative pressure airflow holes are uniformly distributed on the metal receiving net, the semi-closed cavity is connected with a pair of vacuum pumps, the vacuum pumps are arranged oppositely, and negative pressure airflow is formed inside and adsorbs nano fibers formed in the spinning process through the negative pressure airflow holes; the power device comprises a high-speed motor and a triangular conveyor belt, the high-speed motor is connected with an insulating connecting shaft through the triangular conveyor belt and then further connected to the spinning device to provide stable transmission, the positive electrode of the high-voltage generating device is electrically connected with a carbon brush, the carbon brush is fixed on the bottom plate, the metal end of the carbon brush is connected with a metal rod of a core layer of the insulating connecting shaft to transmit electricity to the spinning device, and the negative electrode of the high-voltage generating device is electrically connected with the negative pressure receiving device.
The spinneret comprises an upper cover, a lower seat and a screen, and is fixed through bolt combination, wherein the lower seat comprises a liquid storage tank and solution extrusion ports, the number of the solution extrusion ports on the lower seat is even, the number of the solution extrusion ports on the liquid storage tank in the middle of the spinneret is even, the solution extrusion ports are arranged at equal intervals on the circumference, spinning ports on the screen are micropores uniformly and continuously distributed, spinning solution is firstly gathered in the liquid storage tank of the spinneret, is thrown out through 2-20 liquid outlets of the solution extrusion ports in the high-speed rotating process, the pore diameter is 1.0-6.0mm, and is stretched through a narrow channel to form polymer jet flow, superfine multi-jet flow is formed through the micropores of the screen of the spinning ports, and nanofibers are formed under the action of electrostatic force and centrifugal force. The spinning machine is connected with the coupler, the outer insulating layer of the coupler, the core layer is a metal core, the coupler is in butt joint with the conveying belt and the high-speed motor, and the influence on the rotating motor is caused after the spinning machine applies high voltage is effectively avoided. The motor is attached to the supporting tray, and the belt conveying adopts triangle conveying, effectively improves the rotational speed, breaks through the rotational speed restriction of motor. The periphery of spinning jet is equipped with the receiving arrangement of negative pressure effect, and receiving arrangement is connected with the vacuum pump, and the adsorption of negative pressure for rotatory fibre that produces is quick attached to on collecting the net, reduces the mutual influence between rotatory in-process fibre and the fibre.
And liquid conveying pipes are arranged between the liquid storage tank and the liquid supply pump and between the liquid supply pump and the spinning device, the spinning device is positioned at the central position of the negative pressure receiving device, the bottom of the spinning device is connected with the insulating connecting shaft, and the negative pressure receiving device is positioned on the supporting device.
The supporting device comprises a supporting frame and a bottom plate, the negative pressure receiving device is positioned on the bottom plate and is connected with the vacuum pump through a pipeline, and the aperture of a negative pressure airflow hole in a metal receiving net of the negative pressure receiving device is 0.1-5 mm.
One end of the insulating connecting shaft is connected with the spinning device, the other end of the insulating connecting shaft is connected with the triangular conveying belt, after the device is prevented from applying high voltage, the high voltage influences the normal rotation of the high-speed motor, the triangular conveying belt is connected with the high-speed motor, and the insulating connecting shaft applies positive electricity to the sliding friction of the spinning device through the carbon brush which is in contact with the insulating connecting shaft.
The motor tray four corners is fixed on the support frame, and high-speed motor inversion is adhered to and is fixed on the motor tray, reduces the vibrations that high-speed rotatory in-process of high-speed motor brought, influences the stability of spinning jet.
The use method of the negative pressure multi-jet flow subdivision type centrifugal electrostatic spinning device comprises the following steps:
(1) adding the dried polyacrylonitrile powder into a dimethylformamide solution, and stirring for 4-20h at 50-90 ℃ to obtain a polyacrylonitrile solution with the mass fraction of 8-25%;
(2) building a negative pressure receiving device, starting a high-speed motor, setting the rotating speed to be 500-7000r/min, and starting a vacuum pump, wherein the pressure is-0.01-0.5 Mpa;
(3) turning on the high-voltage generating device, setting the positive voltage output to be 0-50KV, and setting the negative voltage output to be-0.1-10 KV;
(4) and (3) when the high-speed motor in the step (2) rotates at a constant speed and the voltage of the high-voltage generator in the step (3) is stable, pouring the polyacrylonitrile spinning solution obtained in the step (1) into a liquid storage tank, starting a liquid supply pump, setting the propelling quantity to be 1-50ml/h, continuously conveying the spinning solution into the spinneret 1 through a liquid conveying pipe 13, starting continuous and uniform spinning, and taking down the fiber membrane from the metal receiving net after the spinning is finished.
The molecular weight of the polyacrylonitrile is 50000-500000.
The invention has the following beneficial effects: the invention increases the action of centrifugal force on the basis of the traditional electrostatic spinning, utilizes the combined action of the centrifugal force and the electrostatic force to stretch the polymer solution, not only can thin the fiber, but also can produce the oriented nano fiber in batch. In the centrifugal spinning device, the slit subdivision jet concept is adopted, the position of an extrusion opening of the slit spinning device is added with a screen to cut polymer jet, the fineness and the uniformity of jet flow thrown out from the spinning opening are refined, uniform nano fibers are more favorably formed, meanwhile, the yield of the nano fibers effectively increased in the slit spinning is greatly improved, and the superfine nano fibers can be obtained. The collecting device is connected with the vacuum pump through negative pressure adsorption, the semi-closed receiving device is connected with the vacuum pump, negative pressure is generated on a receiving net, adsorption of nano fibers is facilitated, interference between fibers in the rotating process is reduced, the device is convenient to install, simple and convenient, and the spinning effect is good.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a front view of a multi-jet flow subdivision type centrifugal electrostatic spinning device under the action of negative pressure adsorption.
FIG. 2 is a front view of a multi-jet flow subdivided centrifugal electrostatic spinning device under the action of negative pressure adsorption.
FIG. 3 is a schematic view of the spinneret structure.
FIG. 4 is a cross-sectional view of a spinneret.
FIG. 5 is a 5000-fold scanning electron micrograph of fibers prepared by using the device.
Fig. 6 is a graph comparing mechanical properties of the fiber membranes prepared in the application examples and the comparative examples.
Wherein: 1-spinneret, 2-negative pressure receiving device, 3-high pressure generating device, 4-vacuum pump, 5-liquid supply pump, 6-liquid storage tank, 7-bottom plate, 8-carbon brush, 9-high speed motor, 10-triangular conveyor belt, 11-support frame, 12-speed measuring device, 13-liquid conveying pipe, 14-insulating connecting shaft, 15-liquid inlet, 16-spinning port, 17-negative pressure airflow port, 18-solution extrusion port, 19-liquid storage tank, 20-motor tray, 22-semi-closed cavity, 23-metal receiving net, 23-upper cover and 24-lower seat.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments of the present invention, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without inventive effort based on the embodiments of the present invention, are within the scope of the present invention.
Example 1
The negative pressure multi-jet subdivision centrifugal electrostatic spinning device comprises a liquid storage tank 6, a liquid supply pump 5, a spinning device 1, a negative pressure receiving device 2, a power device high-speed motor 9, a supporting frame 11, a bottom plate 7, a high-voltage generating device 3 and a transmission device 10 as shown in fig. 1 and fig. 2, wherein the high-speed motor 9 is connected with an insulating connecting shaft 14 through a triangular conveying belt 10 and further connected onto the spinning device 1 to provide stable transmission. The high-speed motor 9 is attached to the motor tray 20, the periphery of the spinning device 1 is provided with the negative pressure receiving device 2, and the liquid supply pump 5 continuously extracts spinning liquid from the liquid storage tank 6 to extrude and supply the spinning liquid to the spinning device 1; the anode of the high voltage generator 3 is electrically connected with the carbon brush 8, the carbon brush 8 is fixed on the bottom plate 7, the metal end of the carbon brush 8 is connected with the metal bar of the core layer of the insulated connecting shaft 14 to transmit electricity for the spinning nozzle 1, and the cathode is electrically connected with the negative voltage receiving device 2.
Preferably, as shown in fig. 3 and 4, the spinneret comprises an upper cover 23, a lower seat 24 and a screen mesh, and is fixed by a bolt combination, wherein the lower seat 24 comprises a liquid storage tank 19 and solution extrusion openings 18, the number of the solution extrusion openings on the lower seat 24 is even, and the polymer jet is formed by drawing through a narrow passage, the number of the solution extrusion openings of the liquid storage tank 19 in the middle of the spinneret 1 is even, the solution extrusion openings are arranged at equal intervals on the circumference, the spinning openings 16 on the screen mesh are uniformly and continuously distributed micropores, the spinning solution is firstly gathered in the liquid storage tank of the spinneret, is thrown out through 2-20 liquid outlets of the solution extrusion openings during high-speed rotation, the hole diameter is 1.0-6.0mm, and is drawn through the narrow passage to form the polymer jet, the superfine multi-jet is formed by cutting the micropores of the spinning narrow opening screen mesh 16, and the nano-fiber is formed under the action of. The spinning machine is connected with the coupler, the outer insulating layer of the coupler, the core layer is a metal core, the coupler is in butt joint with the conveying belt and the high-speed motor, and the influence on the rotating motor is caused after the spinning machine applies high voltage is effectively avoided. The motor is attached to the supporting tray, and the belt conveying adopts triangle conveying, effectively improves the rotational speed, breaks through the rotational speed restriction of motor. The periphery of spinning jet is equipped with the receiving arrangement of negative pressure effect, and receiving arrangement is connected with the vacuum pump, and the adsorption of negative pressure for rotatory fibre that produces is quick attached to on collecting the net, reduces the mutual influence between rotatory in-process fibre and the fibre.
Preferably, one end of the insulated connecting shaft 14 is connected with the spinneret 1, and the other end is connected with the triangular conveying belt 10, so that the high voltage is prevented from influencing the normal rotation of the high-speed motor 9 after the device applies high voltage. The triangular conveyor belt 10 is connected with the high-speed motor 9, and the position of the triangular conveyor belt is set to skillfully improve the upper limit of the rotating speed. The insulated connection shaft 14 applies positive electricity to the sliding friction of the spinneret 1 through the carbon brush 8.
Example 2
According to the negative-pressure multi-jet subdivided centrifugal electrostatic spinning device, the solution extrusion ports of the middle liquid storage tank 9 of the spinneret 1 are even in number and are arranged at equal intervals on the circumference, the spinning ports 16 are micropores uniformly and continuously distributed, the pore size is 0.1mm, polymer jet can be completely split, and multiple jets can be further subdivided.
Preferably, four corners of the motor tray 20 are fixed on the support frame 11, and the high-speed motor 9 is reversely attached and fixed on the motor tray 20, so that vibration caused by the high-speed rotation process of the high-speed motor 9 is reduced, and the spinning stability of the spinning device 1 is affected.
Preferably, the negative pressure receiving device 2 comprises a semi-closed cavity 22 and a metal receiving net 21, and the aperture of the small hole of the metal receiving net 21 is 1 mm. The semi-closed cavity 22 is connected with a vacuum pump 4 which is arranged oppositely, and negative pressure airflow is formed inside to adsorb the nano-fibers formed in the spinning process through a negative pressure airflow port 17.
The other structure is the same as embodiment 1.
Application example
The application method of the negative-pressure multi-jet subdivision centrifugal electrostatic spinning device in the application embodiment 2 comprises the following steps:
(1) adding the dried polyacrylonitrile powder into a dimethylformamide solution, and stirring for 5 hours at 50 ℃ to obtain a polyacrylonitrile solution with the mass fraction of 12%. The molecular weight of the polyacrylonitrile is 100000;
(2) building the negative pressure receiving device 2, starting the high-speed motor 9 at the rotating speed of 1000r/min, and starting the vacuum pump at the pressure of-0.2 Mpa;
(3) turning on the high voltage generator 3, setting the positive voltage output to 20KV and the negative voltage output to-2 KV;
(4) and (3) when the high-speed motor in the step (2) rotates at a constant speed and the voltage of the high-voltage generator in the step (3) is stable, pouring the polyacrylonitrile spinning solution obtained in the step (1) into a liquid storage tank 6, opening a liquid supply pump 5, setting the propelling quantity to be 20ml/h, and continuously conveying the spinning solution into the spinneret 1 through a liquid conveying pipe 13. And (3) starting continuous and uniform spinning, and after the spinning is finished, taking off the fiber film from the metal receiving net, wherein the fibers are represented by an electron microscope as shown in figure 5. FIG. 5 is a scanning electron microscope 5000 times that of the prepared fiber film, the fiber thickness is uniform, the diameter is distributed at 100-200nm, and the fiber film has good orientation.
Comparative example
The preparation of the fiber membrane is carried out by using the centrifugal electrostatic spinning of the existing needle head, the same spinning solution and electrostatic process in the application example are utilized, the nozzle in the embodiment 2 used in the application example is replaced by a conventional needle head (23G, the diameter of the needle opening is 0.33 mm), the negative pressure receiving device is replaced by a common metal receiving net, and the electrostatic spinning is carried out to prepare the fiber membrane; the mechanical properties of the fiber membrane prepared by the application example are shown in figure 6, and the fiber membrane spun by the device has the breaking stress of 6.05MPa and the breaking elongation of 57.9 percent as can be seen from figure 6. Compared with the needle centrifugal electrostatic spinning fiber membrane with the breaking stress of 3.05Mpa and the breaking elongation of 39.2 percent, the fiber membrane prepared by the method has the advantages of obviously better mechanical property than the common needle centrifugal electrostatic spinning fiber membrane, and good application prospect.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (8)
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| CN112680801A (en) * | 2020-12-22 | 2021-04-20 | 江苏臻中滤料科技有限公司 | Non-woven fabric production device for air filtration and use method |
| CN114367148A (en) * | 2020-10-14 | 2022-04-19 | 苏州真适逸洁净科技有限公司 | Antibacterial and antiviral filter and preparation method thereof |
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| CN112680801A (en) * | 2020-12-22 | 2021-04-20 | 江苏臻中滤料科技有限公司 | Non-woven fabric production device for air filtration and use method |
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