Apparatus and method for facilitating deep embedding of nanofibers

Abstract

The application relates to a device for promoting deep embedding of nanofibers and a use method thereof, which comprises an electrospinning device, a negative pressure air suction device, a fiber web transmission device, a fiber web charge management device and a fiber web lofting control device. The embedding channel of the electrospinning nanofibers in the fiber web is regulated through the fiber web lofting control device, and the residual charge on the screen is neutralized through the fiber web charge management device. The combined use of the devices can induce deep embedding of the electrospinning nanofibers in the thickness direction of the fiber web and effective combination between the fibers in the cross-scale, the function durability and stability of the obtained blended yarn are significantly improved, the industrial production of the cross-scale blended yarn is promoted, and the comprehensive performance of the functional textile is more effectively improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of electrospinning device, in particular to a device and method for promoting deep embedding of nanofibers. BACKGROUND

[0002] Electrospinning is one of the common methods for preparing micro-nanofibers, which is simple to operate and can endow micro-electrospun nanofibers with different properties according to different selected spinning solutions. The electrospinning device is usually composed of three parts: a high-voltage power supply, a nozzle and a collection screen. The high-voltage power supply usually uses a direct current power supply, the nozzle can be placed vertically or horizontally and is connected with a syringe pump for convenient quantitative liquid supply, and the receiving screen can be a metal plate, a net, a roller and the like. The micro-nanofibers prepared by the electrospinning process have high specific surface area, controllable morphology, microstructure and replaceable components, etc., so that they are widely used in filtration and adsorption, sensors, energy storage, medical treatment, catalysis and the like. However, due to the poor mechanical properties and structural anisotropy of the micro-nanofibers, they cannot be used as fiber materials alone for production and application, which seriously limits the development of commercialization and industrialization.

[0003] In view of the above problems, one approach is to use other fibers as a carrier to process and prepare a blended yarn, thereby improving the mechanical properties of the cross-scale fiber assembly. Some existing technologies use electrospinning liquid containing functional additives to spin, so that the obtained functional micro-nano fibers can play the corresponding role as functional substances. One existing technology discloses a "on-line micro-electrospinning nanofiber multi-stage core-spun composite spinning device and method" (application number CN201910566867.6) which realizes the cross-scale online composite spinning of sub-micron fibers and micron fibers by setting an electrospinning device on a spinning machine. The sub-micron fibers are first oriented and deposited on the surface of the chemical fiber filament to form a sub-micron fiber / long filament core-spun yarn, and then the micron short fibers are wrapped outside the yarn body core layer, finally a sub-micron fiber / long filament / short fiber multi-stage core-spun composite yarn is prepared. However, the micron short fibers on the surface layer are prone to falling off during the yarn weaving process due to low adhesion. In another patent "device and method for preparing micro-nano fiber composite yarn" (application number CN202210620177.6), the inventor proposes to install a stepped negative pressure shunt air suction assembly at the doffer outlet of the carding machine, and cooperate with the first and second conveying devices to divide the fiber web into two layers, so that the electrospun micro-nano fibers are sprayed between the two layers of fiber web to form a sandwich structure of cotton fiber / micro-nano fiber / cotton fiber, and then the sliver is gathered to spin and prepare a blended yarn. This solves the problem of easy falling off of electrospun nanofibers during spinning and weaving, but the distribution of micro-nano fibers in the blended yarn is still uneven, and there is still room for improvement. Another existing technology discloses a "device and method for uniform distribution of electrospun nanofibers in a blended yarn system" (application number CN201810011773.8) which proposes to add an electrospun nanofiber orientation collection device composed of a metal sheet array to the electrospinning deposition device to improve the orientation arrangement degree of the electrospun nanofibers with cotton fibers during deposition, thereby improving the uniform distribution of electrospun nanofibers in the blended yarn. However, this method only improves the uniformity of the distribution of electrospun nanofibers in the fiber web receiving plane, and the uniform distribution in the yarn body is improved to some extent through drafting and transfer in the later spinning process. This process will reduce the adhesion of electrospun nanofibers and cotton fibers, and cannot comprehensively realize the uniform distribution and effective combination of electrospun nanofibers in the blended yarn. SUMMARY

[0004] The technical problem to be solved by the present application is to provide a device and method for promoting the deep embedding of nanofibers, which solves the technical problems of uneven distribution of electrospun nanofibers in the blended yarn and poor adhesion between cross-scale fibers.

[0005] The technical scheme adopted by the present application to solve its technical problems is: provide a device for promoting the deep embedding of nanofibers, comprising an electrospinning device, further comprising a negative pressure suction device, a fiber web transmission device, a fiber web charge management device and a fiber web loft control device, the fiber web transmission device comprises a non-metallic conveying net curtain arranged in a loop shape which is circulated by several conveying rollers, and further comprises a conveying belt for conveying the carded fiber web, the carded fiber web is arranged close to the non-metallic conveying net curtain, the electrospinning device and the negative pressure suction device are arranged on both sides of the non-metallic conveying net curtain respectively, and the electrospinning device is arranged on the side where the carded fiber web is located, the fiber web loft control device and the negative pressure suction device are arranged on the same side of the non-metallic conveying net curtain, the fiber web loft control device comprises a needle plate on which high-voltage electric sharp needles are arranged in an array, and air holes are opened on the needle plate, the fiber web charge management device and the electrospinning device are arranged on the same side of the non-metallic conveying net curtain, and the fiber web charge management device is used for neutralizing the electric charge carried on the non-metallic plain net curtain.

[0006] Preferably, the fiber web transmission device comprises four conveying rollers arranged at four corners and a non-metallic conveying net curtain arranged around the outside of the conveying rollers, the non-metallic conveying net curtain is a nylon plain net curtain, and the surfaces of the upper and lower sections of the nylon plain net curtain are parallel to the horizontal plane.

[0007] Preferably, the negative pressure suction device is arranged in a hollow chamber located at the center of the loop-shaped non-metallic conveying net curtain, the fiber web loft control device is arranged in the control chamber, below the negative pressure suction device and close to one end of the non-metallic conveying net curtain, the fiber web loft control device comprises a telescopic device which can move forward and backward towards the non-metallic conveying net curtain, the telescopic end of the telescopic device is provided with the needle plate, and the needle plate is a rubber base cloth with air holes on the surface.

[0008] Preferably, along the transmission direction of the non-metallic conveying net curtain, the fiber web charge management device comprises a first ion fan arranged upstream of the electrospinning device and a second ion fan arranged downstream of the electrospinning device, the air outlet of the first ion fan is directed towards the surface of the non-metallic conveying net curtain and sprays positive ion wind, and the air outlet of the second ion fan is directed towards the surface of the non-metallic conveying net curtain and sprays negative ion wind.

[0009] Preferably, the electrospinning device comprises a positive voltage high-voltage generator and a generating device, the generating device is a copper disc-shaped nozzle, and the copper disc-shaped nozzle is arranged in a direction facing the surface of the non-metallic conveying net curtain.

[0010] Preferably, the sharp needles of the fiber web loft control device are arranged in a direction facing the non-metallic conveying net curtain, the roots of the sharp needles are connected in series by conductive copper wires, and in operation, the sharp needles are connected to a direct current voltage of-10kV to-20kV.

[0011] Preferably, the air vent hole diameter is 3-5 mm, the length of the sharp needle is 1.5-3.5 cm, the root diameter is 1-2 mm, the distance between adjacent sharp needles is 1-2 cm, the size of the rubber base cloth is 30 cm x 30 cm, and the distance between the needle tip of the sharp needle and the surface of the non-metallic conveying net curtain is 15-16 cm.

[0012] The application also provides a method for promoting deep embedding of nanofibers, which adopts the device for promoting deep embedding of nanofibers and comprises the following steps:

[0013] Step 1: dissolving a polymer in an organic solvent to obtain an electrospinning solution, wherein the concentration of the polymer in the electrospinning solution is 8 wt%-14 wt%;

[0014] Step 2: opening and carding the fibers to obtain a carded web, setting the two ends of the carded web on two conveying belts respectively and starting the conveying belts to start transportation, starting a negative pressure air suction device to suck air when the carded web passes through the non-metallic conveying net curtain between the two conveying belts, so that the carded web closely adheres to the non-metallic conveying net curtain and continues to transport, and starting a first ion fan to remove residual charges on the carded web to ensure that the carded web maintains relative electrical neutrality when entering the electrospinning area;

[0015] Step 3: adding the electrospinning solution configured in step 1 into an electrospinning generating device to spin and obtain electrospun nanofibers, starting a telescopic device to drive the fiber web fluffy control device to move towards the non-metallic conveying net curtain to form pore channels arranged along the direction of the electric field on the surface of the passing carded web, and spraying the electrospun nanofibers to the surface of the carded web through the electrospinning generating device, so that the electrospun nanofibers are vertically embedded into the pore channels in the thickness direction of the carded web to obtain a cross-scale composite web;

[0016] Step 4: starting a second ion fan to remove residual charges on the cross-scale composite web and the surface of the non-metallic conveying net curtain in continuous transportation, and outputting the cross-scale composite web through the conveying belt.

[0017] Preferably, in step 1, the polymer is polyacrylonitrile, polystyrene, polyurethane or polyamide, and the organic solvent is DMF or a DMF / acetone mixture.

[0018] Preferably, in step 2, the fibers are cotton, short wool, viscose or chemical fiber short fibers, the transmission rate of the non-metallic conveying net curtain is 15-18 m / min, the power of the first ion fan is 8-15 W, and the linear distance between the air outlet and the non-metallic conveying net curtain is 15-20 cm.

[0019] Preferably, in the step 3, the process parameters of electrospinning are as follows: voltage 35-55 kV, spinning distance 15-20 cm, ambient humidity 35-65%, and ambient temperature 20-27 DEG C.

[0020] Preferably, in the step 4, the power of the second ion fan is 8-15 W, the linear distance between the air outlet and the non-metallic conveying net curtain is 15-20 cm, the outputted cross-scale composite fiber web is gathered into a strip through a horn mouth, compressed and converged by a compression roller, and finally a cross-scale blended yarn is obtained through a subsequent spinning process, which comprises drawing, preparation before combing, combing, roving and spinning.

[0021] Beneficial effects: on the basis of the original composite fiber web production device, the fiber web fluffy control device and the fiber web charge management device are added, and the combination device optimizes the electric field distribution in the electrospinning space without affecting the spinning, eliminates the static electricity generated by the friction between the fibers and the combing part by the ion wind generated by the first ion fan, and guarantees the characteristics of the fiber polarization and the orientation change in the electric field generated by the electrospinning device and the fiber web fluffy control device. In addition, the tip charge aggregation effect caused by the external high-voltage needle tip can change the electric field distribution without significantly affecting the normal spinning, control the polarization degree of the fiber and the pore distribution in the fiber web, and realize the effective construction of the embedded channel of the electrospun nanofiber, which provides effective protection for the deep embedding of the electrospun nanofiber in the fiber web. When the fiber web leaves the spinning area with the net curtain, the fiber polarization degree and the fiber pore decrease due to the decrease of the electric field effect, and the residual charge in the fiber web is neutralized by the ion wind generated by the second ion fan, which reduces the repulsion effect between the fibers and further increases the effective contact area between the fibers, which provides effective protection for the effective combination of the electrospun nanofiber in the fiber web. The above-mentioned devices can realize the uniform distribution and effective combination of the electrospun nanofiber in the embedding fiber web in the initial stage, and further solve the technical problems of uneven distribution of electrospun nanofiber in the mixed yarn body and weak combination between the fibers, which can guarantee the functional stability and durability of the composite fiber web product, i.e. the blended yarn. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 It is a device structure diagram for promoting the deep embedding of nanofiber.

[0023] Figure 2 It is Figure 1 It is a fiber web fluffy control device structure diagram.

[0024] Figure 3 It is Figure 2 It is a needle plate structure diagram.

[0025] Figure 4 The electric field distribution near the conveying net curtain under different conditions is transmitted.

[0026] 1 positive voltage high-voltage generator; 2 electrostatic spinning generating device; 3 first ion fan; 4 conveying belt; 5 negative voltage high-voltage generator; 6 conveying net curtain; 7 negative pressure suction device; 8 suction duct; 9 web lofting control device; 10 conveying roller; 11 second ion fan; 12 telescopic device; 13 needle plate; 14 conductive copper wire; 15 sharp needle; 16 air-permeable hole; and 17 rubber base cloth. DETAILED DESCRIPTION

[0027] The application will be further described below in connection with specific examples. It should be understood that these examples are only used to illustrate the application and not used to limit the scope of the application. Furthermore, it should be understood that after reading the content of the application, those skilled in the art can make various modifications or changes to the application, and these equivalent forms also fall within the scope of the appended claims.

[0028] As shown in Figure 1 the embodiment of the application relates to a device and method for promoting deep embedding of nanofibers by using electrostatic field to loft short fiber web, which comprises a web conveying device, a negative pressure suction device 7, an electrostatic spinning generating device 2, a web charge management device and a web lofting control device 9.

[0029] The web conveying device comprises a conveying net curtain 6 and a conveying roller 10, the conveying net curtain 6 is a nylon plain fabric, the mesh hole of which is a circular hole with a diameter of 3 mm, and the center distance between the circular holes is 9 mm, the conveying net curtain 6 is connected end to end to surround the conveying roller 10 to form a hollow chamber with a cross section similar to a trapezoid, and the surfaces of the upper and lower sections are parallel to the horizontal plane. The carded web obtained by carding is attached to the bottom surface of the conveying net curtain 6 under the suction action of the negative pressure suction device 7, and is conveyed by moving with the conveying net curtain 6.

[0030] The negative pressure suction device 7 and the web lofting control device 9 are both arranged in the hollow chamber, and the web lofting control device 9 is located inside the negative pressure suction device 7.

[0031] The electrostatic spinning generating device 2 is arranged below the web conveying device, and the generating device thereof is connected with the positive voltage high-voltage generator 1, the generating device is a copper disc-shaped nozzle, the diameter of the circle on the upper surface of the disc-shaped nozzle is 6 cm, and the electrospun nanofibers obtained by spinning move upward and are embedded into the moving carded web.

[0032] The fiber web charge management device is composed of ion wind units, which are respectively set on both sides of the electrospinning device and at the same horizontal level as the electrospinning device. The first ion wind unit 3 is located upstream of the fiber web transmission direction and sprays positive ion wind along the direction perpendicular to the fiber web surface. The second ion wind unit 11 is located downstream of the fiber web transmission direction and sprays negative ion wind along the direction perpendicular to the fiber web surface.

[0033] like Figure 2 , 3 As shown, the fiber web fluffing control device 9 is controlled by a telescopic device 12. It includes a rubber base fabric 17 with ventilation holes 16 and an array of distributed needles 15 on the surface of the base fabric, connected to a negative high voltage. The rubber base fabric 17 has ventilation holes 16 with a diameter of 5mm to facilitate the passage of negative pressure suction airflow. The roots of the needles 15 are connected in series by conductive copper wires 14 and are connected to a -15kV DC voltage generated by a negative voltage generator 5 during operation. The needle tips point vertically towards the moving fiber web. The needles 15 are 2cm long, with a root diameter of 1mm, and the spacing between adjacent needles 15 is 2cm. The rubber base fabric 17 measures 30cm × 30cm. The telescopic device 12 controls the distance between the needle tips of the needles 15 and the non-metallic conveyor curtain. The fiber web fluffing control device 9 is controlled by a lifting plate, with the needle tips 15cm from the surface of the conveyor curtain 6. The telescopic device can also employ a telescopic motor or similar design.

[0034] The specific steps of the device and method for promoting deep embedding of nanofibers by fluffing short fiber webs with an electrostatic field in one specific embodiment are as follows:

[0035] Step 1: Dissolve polyacrylonitrile (PAN) in N,N-dimethicone (DMF) and stir at a constant temperature of 20°C for 12 hours to obtain an electrospinning solution, wherein the mass fraction of PAN in the spinning solution is 12%.

[0036] Step 2: The opened cotton fibers are fed into a carding machine to form a carded web. The carded web is placed on the bottom surface of the conveyor curtain 5 and subjected to the suction of the negative pressure suction device 6. The conveyor curtain speed is 15m / min. When the carded web is transported above the No. 1 ion fan, it is subjected to the action of the ion fan, which has a power of 10W. The vertical height of the air outlet from the conveyor curtain is 20cm.

[0037] Step 3: The spinning solution is added to the generator of the electrospinning device to obtain PAN electrospun nanofibers. The electrospinning process parameters are: applied voltage of 45kV, spinning distance of 20cm, ambient humidity of 50%, and ambient temperature of 22℃. The electrospun nanofibers will enter the pore channels formed by the polarization movement of the fibers perpendicularly along the thickness direction of the fiber web, resulting in a multi-scale composite fiber web. The spinning distance refers to the straight-line distance from the nozzle of the electrospinning device to the carded fiber web.

[0038] Step 4: When the web continues to transport with the web curtain to the top of the second ion fan, it is affected by the ion fan, the power of which is 8 W, and the outlet of the fan is 20 cm away from the vertical height of the transmission web curtain, and then it is gathered into a strip through the horn, and is compressed and gathered by the compression roller. After the processes of drawing, pre-combing, combing, roving and spinning, the cross-scale blended yarn is obtained.

[0039] After the simulation of adding the web bulkiness control device, the electric field distribution near the web is shown in Figure 4 , in which x = 0.25 m is the center position of the electrospinning device.

[0040] The working principle of the device is as follows: the ion wind generated by the first ion fan can eliminate the static electricity generated by the friction between the fibers and the carding parts in the carded web, and maintain the relative electrical neutrality of the web. When the web is transported with the web curtain to the top of the electrospinning device, the fibers in the web will produce a deflection motion due to polarization in the electric field formed by the high voltage, and have a tendency to arrange along the direction of the electric field, which can increase the number of pores in the web and provide a channel for the embedding of electrospun nanofibers. The pressure needle tip in the web bulkiness control device cooperates with the non-metal web transmission net curtain, on the one hand, the non-metal net curtain will not produce static shielding effect on the tip effect of the pressure needle tip, and on the other hand, the air permeable holes in the suction chamber will not interfere with the suction effect. The electric charge is gathered at the negative pressure needle tip on the web bulkiness control device, which increases the electric field strength near the web and enhances the polarization degree of the fibers. By changing the pressure, the density of the needle tip and the distance between the needle tip and the transmission net curtain, etc., the distribution of the pores in the web can be improved and controlled, the embedding channel of the electrospun nanofiber can be constructed, and the embedding depth of the electrospun nanofiber in the thickness direction of the web can be improved. When the web continues to transport away from the spinning area, the influence of the electric field decreases, the polarization degree of the fibers decreases, and the fiber pores decrease. At the same time, the ion wind generated by the second ion fan can neutralize the residual charge in the web that cannot escape through the non-metal net curtain, which weakens the mutual repulsion effect of the fibers, further increases the effective contact area between the fibers, and enhances the binding firmness between the cross-scale fibers. From the source, the distribution uniformity and binding firmness of the electrospun nanofiber are controlled, and then the functional stability and durability of the blended yarn are improved.

[0041] The patent aims to ensure the mass production of electrospun nanofibers. Under the premise of mass production, the characteristics of the fiber web loft change and pore formation caused by the polarized movement of the fibers in the electric field are utilized. Through the combination of the fiber web loft control device and the non-metal transmission net curtain, the electric field distribution is regulated without affecting normal spinning production. The pore distribution in the constructed fiber web and the embedded channel of electrospun nanofibers are further changed. The deep embedding of electrospun nanofibers in the thickness direction of the fiber web is realized. When the fiber web continues to transport away from the spinning area, the polarization effect of the fiber web weakens, the inter-fiber pores decrease, and the residual charge in the fiber web that cannot escape through the non-metal net curtain is neutralized by the ion wind generated by the second ion fan. The mutual repulsion effect of the fibers is weakened, the effective contact area between the fibers is further increased, and the cross-scale fiber bonding strength is enhanced. Finally, the uniformity of the distribution of electrospun nanofibers in the blended yarn body and the bonding strength are significantly improved.

Claims

1. An apparatus for facilitating deep embedding of nanofibers, comprising an electrospinning device, characterized in that, It also comprises a negative pressure air suction device, a web transmission device, a web charge management device and a web lofting control device, The web transmission device comprises a non-metallic transmission web curtain arranged in a loop shape and circulated by several transmission rollers, and a transmission belt for conveying the carded web, the carded web is arranged close to the non-metallic transmission web curtain, the electrospinning device and the negative pressure air suction device are arranged on both sides of the non-metallic transmission web curtain respectively, and the electrospinning device is arranged on the side where the carded web is located, The web lofting control device and the negative pressure air suction device are arranged on the same side of the non-metallic transmission web curtain, the web lofting control device comprises a needle plate with a plurality of high-voltage electrically connected pins arranged on the surface, and the needle plate is provided with air holes, The web charge management device and the electrospinning device are arranged on the same side of the non-metallic transmission web curtain, and the web charge management device is used to neutralize the electric charge on the non-metallic transmission web curtain, Along the transmission direction of the non-metallic transmission web curtain, the web charge management device comprises a first ion fan arranged upstream of the electrospinning device and a second ion fan arranged downstream of the electrospinning device, the air outlet of the first ion fan is directed towards the surface of the non-metallic transmission web curtain and sprays positive ion wind, and the air outlet of the second ion fan is directed towards the surface of the non-metallic transmission web curtain and sprays negative ion wind.

2. The device of claim 1, wherein, The web transmission device comprises four transmission rollers arranged at four corners and a non-metallic transmission web curtain arranged around the outside of the transmission rollers, the non-metallic transmission web curtain is a nylon plain web curtain, and the surfaces of the upper and lower sections of the nylon plain web curtain are parallel to the horizontal plane.

3. The device of claim 2, wherein, The negative pressure air suction device is arranged in a hollow chamber located at the center of the annularly arranged non-metallic transmission web curtain, the web lofting control device is arranged in the hollow chamber below the negative pressure air suction device and close to one end of the non-metallic transmission web curtain, the web lofting control device comprises a telescopic device that can move forward and backward towards the non-metallic transmission web curtain, the telescopic end of the telescopic device is provided with the needle plate, and the needle plate is a rubber base cloth with air holes on the surface.

4. The device of claim 1, wherein, The electrospinning device comprises a positive voltage high-voltage generator and a generating device, the generating device is a copper disc-shaped nozzle, and the copper disc-shaped nozzle is arranged in a direction facing the surface of the non-metallic transmission web curtain.

5. The device of claim 3, wherein, The pins of the web lofting control device are arranged in a direction facing the non-metallic transmission web curtain, the roots of the pins are connected in series by conductive copper wires, and the pins are connected to a direct current voltage of-10~-20 kV during work.

6. The device of claim 5, wherein, The diameter of the air holes is 3~5mm, the length of the pins is 1.5~3.5cm, the diameter of the roots of the pins is 1~2mm, the distance between adjacent pins is 1~2cm, the size of the rubber base cloth is 30cm×30cm, and the distance between the tips of the pins and the surface of the non-metallic transmission web curtain is 15~16cm.

7. A method of facilitating deep embedding of nanofibers, characterized by, The device for promoting the deep embedding of nanofibers is used, and the method comprises the following steps: Step 1: dissolving the polymer in an organic solvent, stirring to obtain an electrospinning solution, the concentration of the polymer in the electrospinning solution being 8wt%-14wt%; Step 2: opening and carding the fibers to obtain a carded web, setting the two ends of the carded web on two conveying belts respectively and starting the conveying belts to start transportation, starting a negative pressure air suction device to suck air when the carded web passes through the non-metallic conveying screen between the two conveying belts, so that the carded web adheres to the non-metallic conveying screen and continues to transport, and starting a first ion fan to remove residual charges on the carded web to ensure that the carded web maintains relative electrical neutrality when entering the electrospinning area; Step 3: adding the electrospinning solution configured in step 1 into an electrospinning generating device to spin and obtain electrospun nanofibers, starting a telescopic device to drive the fiber web fluffy control device to move towards the non-metallic conveying screen to form pore channels arranged along the direction of the electric field on the surface of the passing carded web, and spraying the electrospun nanofibers to the surface of the carded web through the electrospinning generating device to make the electrospun nanofibers vertically embedded in the pore channels in the thickness direction of the carded web, thereby obtaining a cross-scale composite web; Step 4: starting a second ion fan to remove residual charges on the surface of the cross-scale composite web and the non-metallic conveying screen in continuous transportation, and outputting the cross-scale composite web through the conveying belt.

8. The method of claim 7, wherein, In the step 1, the polymer is polyacrylonitrile, polystyrene, polyurethane or polyamide, and the organic solvent is DMF or a DMF / acetone mixture; in the step 2, the fibers are cotton, short wool, viscose or chemical fiber staple, the transmission rate of the non-metallic conveying screen is 15-18 m / min, the power of the first ion fan is 8-15 W, and the linear distance between the air outlet and the non-metallic conveying screen is 15-20 cm.

9. The method of claim 7, wherein, In the step 3, the process parameters of electrospinning are: voltage 35-55 kV, spinning distance 15-20 cm, ambient humidity 35-65%, and ambient temperature 20-27℃; in the step 4, the power of the second ion fan is 8-15 W, the linear distance between the air outlet and the non-metallic conveying screen is 15-20 cm, the cross-scale composite web after output is bundled into a strip through a horn, compressed and converged by a compression roller, and finally a cross-scale blended yarn is obtained through a subsequent spinning process, the subsequent spinning process including drawing, preparation before combing, combing, roving and spinning.

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