CN100390332C - Electric device and method for spinning generation and collection - Google Patents

Abstract

A device and method for generating and collecting electrospinning, belonging to the field of preparation of one-dimensional nanomaterials, the device of the present invention mainly includes four parts: injection device, liquid supply device, high-voltage power supply and collection device, using two or two sets of Positively connected nozzles with positive and negative polarity high voltage are used as the injection system, and the oppositely charged fibers ejected from the nozzles attract, collide, and neutralize each other in the air, and become spinning bundles with rapidly reduced flying speeds, which are collected as Highly unidirectional fibers. The invention can collect continuous and highly unidirectionally arranged nanometer or micrometer fibers in a large area, and can prepare evenly mixed two-component or multi-component fiber structures; the fibers can be directly collected on the insulating surface. The invention expands the concept of the traditional electrospinning method, expands the flexibility of use, especially provides a very effective means for collecting continuous and highly unidirectionally arranged fibers, and endows the electrospun fibers with broader application prospects.

Description

A device and method for generating and collecting electrospinning

technical field

The invention relates to a device and method for generating and collecting electrospinning, in particular to an electrospinning method and device for preparing and arranging continuous micro/nano-scale fibers, belonging to the field of one-dimensional nanomaterial preparation.

Background technique

Electrospinning technology has attracted more and more attention, and has been widely used in filter materials, wound dressings, biological tissue engineering materials, nanocomposites and sensors. It is considered to be a method for preparing continuous micro/nano Ideal way to scale fibers. The electrospinning device generally includes four parts: a high-voltage power supply, a liquid supply device, a spray device and a collection device. The liquid supply device supplies the solution or molten liquid of polymer or other materials to the injection device, and the high-voltage power supply provides a DC voltage of hundreds to tens of thousands of volts to the nozzle. Under the action of the electric field force, the liquid in the nozzle is pulled out to form a very thin jet and flies to the collecting device. The jet solidifies and refines during the flight, and finally becomes nano or micron-scale fibers. The receiving device is generally a flat electrode that is grounded or connected to a negative voltage. Due to the high-speed random swing of the jet during flight, the above electrospinning process obtains non-woven fabrics with randomly distributed fiber directions, which can only be applied to fields such as filter materials and wound dressings.

In many applications such as nano-reinforced materials and sensors, fibers with good orientation are needed. So far, there are mainly the following three electrospun fiber alignment processes: 1) Use a high-speed rotating cylinder as a receiving device. When the cylinder When the rotation speed is fast enough, the fiber arrangement with a certain degree of orientation can be obtained. However, if the speed is too high, the fibers will be broken, so the fiber arrangement obtained by this collection method is far from ideal. 2) A thin disk with sharp edges is used as a collection device. Due to the focusing effect of the electric field on the edge of the disk, when the disk rotates at high speed, the fibers are attracted to its edge and a good unidirectional arrangement is obtained. The disadvantage of this method is that the fibers can only be collected to a very narrow extent at the edge of the disc. 3) Two conductive flat plates are used as the receiving device, and an insulating area with a width of several millimeters is formed between them, and well-oriented fibers can be obtained on the insulating area after spraying for a period of time. The disadvantage of this method is that the collection range is very small, and when the width of the insulating area is greater than 1 cm, the fiber orientation gradually becomes poor. Because most of the fibers are sprayed onto the two conductive plates, as the fiber layer covers the plates, the orientation of the fibers in the insulating area will also become poor.

Contents of the invention

The object of the present invention is to provide a kind of electrospinning generation and collection device, comprising:

A liquid supply device, which provides working liquid to the injection device; the liquid supply device can control the flow rate of the injection device; the supply flow rate is 0.01μl/min-5000μl/min;

Two injection devices are connected to the liquid supply device and receive the working liquid, and respectively eject fibers with positive and negative charges; the injection device includes a nozzle; the loading voltage of the injection device can be adjusted separately; the two The nozzles of the spraying devices are opposite, and the distance between the two spraying devices is 2cm to 60cm;

High-voltage power supply provides positive and negative loading voltages to the two injection devices respectively; the voltage adjustment range is 2kV～20kV and -2kV～-20kV;

Collecting device, it is used for collecting described fiber bundle, obtains desired fiber; Said collecting device is positioned at the position that is 0-500cm perpendicular distance with two injection devices; Controls the surface speed of collecting device, obtains the different degree of orientation Fibrous structure.

Among them, the liquid supply device is a syringe pump or an air pressure control system; each injection device has one or more nozzles, and the nozzles are glass capillaries or metal needles; in order to focus the electric field, thin flat electrodes can be fixed on the nozzles, and the collection device is Rotary device or belt drive, the surface of the collection device is made of conductive or insulating material.

In addition, the object of the present invention is also to provide a method for generating and collecting electrospinning, which method includes the following steps:

1) Fill the electrospinning working solution into the liquid supply device and connect it with the two injection devices;

2) Adjust the supply flow rate of the two injection devices to 0.1μl/min～50μl/min;

3) Adjust to make the two injection devices face each other, and adjust the distance between them to be 2cm to 60cm;

4) Adjust the position of the collecting device so that the vertical distance from the two nozzles is 0-500cm;

5) Adjust the surface velocity of the collecting device to 0.01m/s～50m/s;

6) Adjust the loading voltage of the two injection devices to 2kV~20kV and -2kV~-20kV respectively; the injection devices eject fibers with positive and negative charges respectively, and the fibers meet in the air and are adsorbed together to form a sharp decrease in speed fiber bundles; using air flow or insulating rods to draw the fiber bundles to the surface of the collection device to start collection.

The present invention also includes the following features: 1) When the collecting device is located between the two nozzles, uniform fiber materials can be collected on the surface of conductive or insulating materials with smaller diameters. 2) When the collection device is at a certain vertical distance from the nozzle, highly unidirectionally arranged fibers can be collected on conductive or insulating devices of various sizes. 3) Different high molecular polymer or other material solutions or molten liquids are supplied to the two nozzles respectively, and the flow rate is controlled separately, so that a uniformly mixed bicomponent fiber structure can be obtained. 4) Expand the above two nozzles into two groups of nozzles, each group of nozzles can contain different numbers of nozzles and be arranged in different geometric structures; the above nozzles can be supplied with the same polymer or other material solution molten liquid, or Different liquids are supplied to obtain a homogeneous multicomponent fiber structure. 5) The collecting device includes moving devices of various shapes. In addition to using a cylinder for collecting, a belt transmission device is also used for collecting. By controlling the surface velocity of the collecting device, fiber structures with different degrees of orientation can be obtained.

The method and device for generating and collecting electrospinning described above are applicable to various polymer or other material solutions and molten liquids used in traditional electrospinning methods and devices.

The beneficial effects of the present invention are: the method and device can be used to collect continuous highly unidirectionally arranged nanometer or micrometer fibers on a large area, and can prepare a uniformly mixed bicomponent or multicomponent fiber structure; Fibers are collected directly on insulating surfaces, whereas conventional methods require collection devices to be conductive and grounded or negatively charged. The method and device of the present invention expand the concept of the traditional electrospinning method, expand the flexibility of use, especially provide a very effective means for collecting continuous and highly unidirectionally arranged fibers, and endow the electrospun fibers with more Broad application prospects.

Description of drawings

Figure 1 is a schematic diagram of the device of the present invention.

Figure 2 shows four examples of nozzle arrangements of the spraying device.

Figure 3 is a schematic diagram of spraying when the receiving device is placed in the middle of the nozzle.

Figure 4 is a schematic diagram of using a belt drive as a receiving device.

Figure 5 is a scanning electron micrograph of highly unidirectionally aligned fibers collected using the method and apparatus of the present invention.

Detailed ways

The present invention will be described below in conjunction with the accompanying drawings.

Fig. 1 is a schematic view of the device of the present invention, wherein 1 and 2 are spray nozzles connected to positive and negative power supplies respectively, 3 and 4 are respectively the fibers ejected from nozzle 1 and nozzle 2, and 5 is that fibers 3 and 4 attract each other and gather in The fiber bundles formed together, 6 is the collection device, 7 is the highly unidirectional nanofibers collected at last. Nozzles 1 and 2 form the injection unit, the positions of which can be adjusted individually. The above-mentioned same working fluid may be supplied to them by the liquid supply device, or different working fluids may be supplied respectively. The positively and negatively charged fibers 3 and 4 ejected from the nozzles 1 and 2 meet in the air and are adsorbed together to form a fiber bundle with a sharply reduced speed. The fiber bundle is drawn to the high-speed rotating collecting device 6, just It can be drawn into finer fiber bundles 5, after which a continuous highly unidirectional fiber 7 can be collected on a collecting device 6. The above-mentioned drawing process provides the mechanical power for the alignment of the spinning orientation, and the higher the surface speed of the collecting device, the better the unidirectionality of the obtained fibers. However, in order to prevent fiber breakage during the collection process, the surface speed of the collection device is generally not greater than 50m/s.

The device of the present invention mainly includes four parts: spraying device, liquid supply device, high-voltage power supply and collecting device.

1) High voltage power supply

Two sets of DC high-voltage power supplies are used, and the output voltages of the power supplies are positive and negative 2kV to 20kV respectively. They are respectively connected with two injection devices and provide high voltage, and the loading voltage on the two nozzles can be adjusted separately.

2) Liquid supply device

The liquid supply unit uses a syringe pump, and an air pressure control system can also be used. The flow rate of each nozzle can be controlled from 0.01μl/min to 5000μl/min.

3) Injection device

Figure 2 shows four examples of nozzle arrangements of the spraying device. The injection device can use a glass capillary or a medical syringe needle with an inner diameter of 10 μm-5 mm. The inner diameters of the two nozzles can be the same or different. In order to gather the electric field, "blade-shaped" thin plate electrodes 8 and 9 can also be fixed on the nozzle, as shown in Figure 2(a), the plate electrode and the nozzle are connected to a high-voltage power supply at the same time. The two nozzles can also be rotated at an angle, as shown in Figure 2(b), this structure can make the neutralized fiber bundles easily pulled out.

The above two nozzles with positive and negative high voltages can be replaced by two sets of nozzle arrays, which are respectively connected with positive and negative DC high voltages. The two groups of nozzles are placed opposite to each other to ensure that the spinning fibers they spray can meet and adsorb each other. Each group of nozzles can contain different numbers of nozzles and can be arranged in different geometric shapes and spatial structures. Fig. 2(c), (d) are two arrangement examples of spraying devices including two nozzles in each group.

In the case of multiple nozzles, the same high-level working fluid may be supplied to all the nozzles, different fluids may be supplied in groups, or different fluids may be individually supplied to each nozzle. In addition, each nozzle can be controlled to use the same flow rate or a different flow rate. In this way, homogeneously mixed multicomponent fiber products can be obtained.

4) Collection device

Figure 1 shows that the high-speed rotating cylinder is collected at a certain distance from the two nozzles, and a smaller cylinder can also be placed between the nozzles for collection. Figure 3 is a schematic diagram of the spraying when the receiving device is placed in the middle of the nozzles. The arrangement of fibers collected in this way is similar to that of the traditional rotating cylinder method. The difference is that this method can directly collect and spin on the insulating cylinder. The traditional method requires the cylinder to be conductive and needs to be connected to negative electricity or grounded. In addition, during the collection process of this method, there are no special restrictions on the location and angle of the collection device, and it can be located at any position with a vertical distance from several millimeters to hundreds of centimeters from the two nozzles. There is no limit to the size of the collection device. Using a cylinder with a large diameter to collect can obtain fiber arrangement on a large area, which cannot be achieved by many current fiber arrangement methods. In order to distribute the collected fibers evenly along the axial direction of the collecting cylinder, the cylinder or the nozzle can be slowly reciprocated along the axial direction of the cylinder. The collection device can be a moving device of various shapes, except the cylinder, the belt drive shown in Figure 4 can also be used as the collection device.

The invention provides a new method and device for generating and collecting electrospinning, which can prepare continuous highly unidirectionally arranged micro-nano fibers. Among them, two or two sets of opposite nozzles 1 and 2 respectively connected to positive and negative high voltages are used as the injection system, and the oppositely charged fibers ejected from the nozzles attract, collide and electrically neutralize each other in the air, forming a flying Fiber bundles with dramatically reduced velocity, thus providing a new method of electrospinning generation and collection with the following steps:

1) Fill the electrospinning working solution into the liquid supply device and connect it with the two injection devices;

2) Adjust the supply flow rate of the two injection devices to 0.1μl/min～50μl/min;

3) Adjust to make the two injection devices face each other, and adjust the distance between them to be 2cm-60cm;

4) Adjust the position of the collecting device so that the vertical distance from the two nozzles is 0-500cm;

5) Adjust the surface speed of the collecting device to 0.01m/s～50m/s

6) Adjust the loading voltage of the two injection devices to 2kV~20kV and -2kV~-20kV respectively; the injection devices eject fibers with positive and negative charges respectively, and the fibers meet in the air and are adsorbed together to form a sharp decrease in speed fiber bundles; using air flow or insulating rods to draw the fiber bundles to the surface of the collection device to start collection.

The method and device for generating and collecting electrospinning described above are applicable to various high molecular polymer or other material solutions and molten liquids used in traditional electrospinning devices.

Fig. 5 is a scanning electron micrograph of highly unidirectionally aligned fibers collected by the method and device of the present invention, wherein the fiber material is PVA with a diameter of about 320 nanometers.

The present invention is illustrated below by way of examples.

example 1:

1. Use the PVA aqueous solution with a mass percentage of 7% as the working liquid, put it into the air pressure liquid supply device and connect it with two nozzles;

2. Adjust the supply flow rate of the two nozzles to 0.1μl/min;

3. Make the two nozzles face each other, and adjust the distance between them to 30cm;

4. Use a polytetrafluoroethylene tube with a diameter of 6mm as the collection device, and adjust the vertical distance between it and the two nozzles to be 5cm.

5. Adjust the rotating speed of the cylinder to 3000rpm;

6. Turn on the positive and negative high-voltage power supplies, and adjust the voltages to 7kV and -7kV respectively. Use an insulating rod to draw the ejected fiber bundle to the surface of the Teflon tube and start collecting and spinning.

Example 2:

1. Take 10% PVA aqueous solution as the working liquid, put it into a dual-channel syringe pump and connect it with two nozzles;

2. Adjust the supply flow rate of the two nozzles to be 3μl/min;

3. Make the two nozzles face each other, and adjust the distance between them to 2cm;

4. Use a metal cylinder with a diameter of 40mm as the collection device, and adjust the vertical distance between it and the two nozzles to be 15cm.

5. Adjust the rotation speed of the cylinder to 1000rpm;

6. Turn on the positive and negative high-voltage power supplies, and adjust the voltages to 2kV and -2kV respectively. The ejected fiber bundles are drawn to the surface of the metal cylinder using insulating rods to start collecting and spinning.

Example 3:

1. Use 10% PVA aqueous solution as the working liquid, put it into a dual-channel syringe pump and communicate with two nozzles;

2. Adjust the flow rates of the positive and negative nozzles to 2μl/min and 7μl/min respectively;

3. Make the two nozzles face each other, and adjust the distance between them to 20cm;

4. Use a metal cylinder with a diameter of 40mm as the collection device, and adjust the vertical distance between it and the two nozzles to be 20cm.

5. Adjust the rotation speed of the cylinder to 1000rpm;

6. Turn on the positive and negative high-voltage power supplies, and adjust the voltages to 7kV and -7kV respectively. The ejected fiber bundle is drawn to the surface of the metal cylinder by means of airflow control, and the collection and spinning are started.

Example 4:

1. Use 8% PVA aqueous solution as the working liquid, put it into the pneumatic liquid supply device and communicate with the two nozzles;

2. Adjust the supply flow rate of the two nozzles to 50μl/min;

3. Make the two nozzles face each other, fix the face plate electrodes on the nozzles, and adjust the distance between them to 60cm;

4. Use a polytetrafluoroethylene tube with a diameter of 8mm as a collection device and place it between the two nozzles.

5. Adjust the rotation speed of the PTFE tube to 4000rpm;

6. Turn on the positive and negative high-voltage power supplies, adjust the voltage to 20kV and -20kV respectively, and start collecting and spinning.

Example 5:

1. Use the chloroform solution of PS with a mass percentage of 16% as the working liquid, put it into the air pressure liquid supply device and communicate with the two nozzles;

2. Adjust the supply flow rate of the two nozzles to 5μl/min;

3. Make the two nozzles face each other, and adjust the distance between them to 30cm;

4. Use the belt drive to collect the fiber, and adjust the vertical distance between it and the two nozzles to be 10cm.

5. Adjust the surface speed of the belt drive to 2m/s;

6. Turn on the positive and negative high-voltage power supplies, and adjust the voltages to 9kV and -9kV respectively. Insulation rods are used to draw the ejected fiber bundles to the surface of the belt drive to start the collection spinning.

Example 6:

1. Use 10% PEO aqueous solution as the working liquid, put it into the pneumatic liquid supply device and communicate with the two nozzles;

2. Adjust the flow rate of the positive and negative nozzles to 3μl/min and 6μl/min respectively;

3. Make the two nozzles face each other, and adjust the distance between them to 30cm;

4. Use the belt drive to collect the fiber, and adjust the vertical distance between it and the two nozzles to be 10cm.

5. Adjust the surface speed of the belt drive to 1.5m/s;

6. Turn on the positive and negative high-voltage power supplies, and adjust the voltages to 10kV and -13kV respectively. Insulation rods are used to draw the ejected fiber bundles to the surface of the belt drive to start the collection spinning.

Example 7:

1. Prepare PVA aqueous solutions with mass percentages of 7% and 10%, add the solutions to a dual-channel syringe pump, supply 7% PVA aqueous solution to the positive nozzle, and supply 10% PVA aqueous solution to the negative nozzle;

2. Adjust the supply flow of positive and negative nozzles to 10μl/min and 4μl/min respectively;

3. Make the two nozzles face each other, and adjust the distance between them to 30cm;

4. Use a metal cylinder with a diameter of 40mm as the collection device, and adjust the vertical distance between it and the two nozzles to be 15cm.

5. Adjust the rotating speed of the cylinder to 800rpm;

6. Turn on the positive and negative high-voltage power supplies, and adjust the voltages to 11kV and -11kV respectively. Use an insulating rod to draw the ejected fiber bundles to the surface of the metal cylinder, and start collecting and spinning.

Example 8:

1. Prepare a DMAc solution with a PVDF mass percentage of 20% and a PVC mass percentage of 25% DMAc solution, add the solutions to a dual-channel syringe pump, and connect them to the positive and negative nozzles respectively;

2. Adjust the flow rates of positive and negative nozzles to 12μl/min and 15μl/min respectively;

3. Make the two nozzles face each other, and adjust the distance between them to 30cm;

4. Use a metal cylinder with a diameter of 30mm as the collection device, and adjust the vertical distance between it and the two nozzles to be 20cm.

5. Adjust the rotating speed of the cylinder to 800rpm;

6. Turn on the positive and negative high-voltage power supplies, and adjust the voltages to 15kV and -15kV respectively. Use the method of airflow control to draw the jetted fiber bundle to the surface of the metal cylinder, and start to collect and spin.

Example 9:

1. Prepare a DMAc solution with a PVDF mass percentage of 20% and a PVC mass percentage of 25% DMAc solution, add the solutions to a dual-channel syringe pump, and connect them to the positive and negative nozzles respectively;

2. Adjust the flow rate of positive and negative nozzles to 10μl/min and 12μl/min respectively;

3. Make the two nozzles face each other, and adjust the distance between them to 30cm;

4. Use a polytetrafluoroethylene tube with a diameter of 8mm as the collection device, and adjust the vertical distance between it and the two nozzles to be 20cm.

5. Adjust the rotation speed of the PTFE tube to 3000rpm;

6. Turn on the positive and negative high-voltage power supplies, and adjust the voltages to 12kV and -12kV respectively. Use an insulating rod to draw the ejected fiber bundle to the surface of the Teflon tube and start collecting and spinning.

Example 10:

1. Prepare a DMAc solution with a PVDF mass percentage of 20% and a PVC mass percentage of 25% DMAc solution, add the solutions to a dual-channel syringe pump, and connect them to the positive and negative nozzles respectively;

2. Adjust the flow rate of positive and negative nozzles to 15μl/min and 8μl/min respectively;

3. Make the two nozzles face each other, and adjust the distance between them to 35cm;

4. Use a belt drive to collect fibers, and adjust the vertical distance between them and the two nozzles to be 20cm.

5. Adjust the surface speed of the belt drive to 3m/s;

6. Turn on the positive and negative high-voltage power supplies, and adjust the voltages to 15kV and -15kV respectively. The jetted fiber bundles are drawn to the surface of the belt drive by means of airflow control, and the spinning begins.

Example 11:

1. Prepare a 20% DMAc solution with a mass percentage of 2:1 PVDF and PVC, add the solution to the air pressure liquid supply device and connect it with two nozzles;

2. Adjust the flow rate of the two nozzles to 13μl/min;

3. Make the two nozzles face each other, and adjust the distance between them to 20cm;

4. Use a metal cylinder with a diameter of 30mm as the collection device, and adjust the vertical distance between it and the two nozzles to be 25cm.

5. Adjust the speed of the metal cylinder to 1200rpm;

6. Turn on the positive and negative high-voltage power supplies, and adjust the voltages to 6kV and -6kV respectively. A glass rod is used to draw the ejected fiber bundle to the surface of a metal cylinder to start collecting and spinning.

Example 12:

1. Prepare a DMAc solution with a mass percentage of 1:3 of PVDF and PVC with a mass percentage of 20%, and add the solution to the air pressure liquid supply device and connect it with two nozzles;

2. Adjust the flow rate to 10μl/min;

3. Make the two nozzles face each other, and adjust the distance between them to 35cm;

4. Use a polytetrafluoroethylene tube with a diameter of 6mm as the collection device, place it between the two nozzles and adjust it to the same height;

5. Adjust the rotation speed of the PTFE tube to 1500rpm;

6. Turn on the positive and negative high-voltage power supplies, adjust the voltage to 10kV and -10kV respectively, and start collecting and spinning.

The above-mentioned method is only a preferred embodiment of the present invention. For those of ordinary skill in the art, on the basis of the present invention disclosing the use of two opposite injection devices with opposite voltage polarities, it is easy to make various types of injection devices. Improvements or modifications are not limited to the devices and methods described in the above specific embodiments of the present invention, so the foregoing descriptions are only preferred rather than limiting.

Claims (8)

1. the electrospinning silk device that takes place and collect is characterized in that: this electrospinning silk takes place and the device collected comprises:

Fluid Supplying apparatus, it provides hydraulic fluid to injection apparatus; Described fluid Supplying apparatus can be controlled the flow of described injection apparatus; Supply flow rate is 0.01 μ l/min～5000 μ l/min;

Two injection apparatus connect described fluid Supplying apparatus and receive hydraulic fluid, and eject the fiber that has positive and negative electric charge respectively; Described injection apparatus comprises nozzle; Described injection apparatus on-load voltage can be regulated respectively; Described two injection apparatus nozzles are relative, and the distance between two injection apparatus is 2cm～60cm;

High voltage source provides the on-load voltage of positive and negative polarity respectively to two injection apparatus; The voltage-regulation scope be 2kV～20kV and-2kV～-20kV;

Gathering-device is used for collecting described fibre bundle, to obtain required fiber; Described gathering-device be positioned at two injection apparatus vertical ranges be 0～500cm position; The superficial velocity of control gathering-device is to obtain the fibre structure of different orientation degree.

2. the device that electrospinning silk as claimed in claim 1 takes place and collects is characterized in that described fluid Supplying apparatus is syringe pump or pneumatic control system.

3. the device that electrospinning silk as claimed in claim 1 takes place and collects is characterized in that each injection apparatus has one or more nozzles respectively.

4. the device that electrospinning silk as claimed in claim 1 takes place and collects is characterized in that described nozzle is capillary glass tube or syringe needle.

5. the device that electrospinning silk as claimed in claim 1 takes place and collects is characterized in that, is fixed with the thin flat plate electrode on the described nozzle.

6. the device that electrospinning silk as claimed in claim 1 takes place and collects is characterized in that described gathering-device is whirligig or belt drive unit.

7. the device that electrospinning silk as claimed in claim 1 takes place and collects is characterized in that, conduction or insulating materials are adopted in the surface of described gathering-device.

8. the electrospinning silk method that takes place and collect, it comprises the steps:

1) working solution of electrospinning silk is packed into fluid Supplying apparatus, and it is linked to each other with two injection apparatus;

2) supply flow rate of two injection apparatus of adjusting is 0.1 μ l/min～50 μ l/min;

3) adjust and to make two kinds of injection apparatus relative, and to regulate their distances each other be 2cm～60cm;

4) regulate the position of gathering-device, making the vertical range of itself and two nozzles is 0～500cm;

5) the superficial velocity 0.01m/s～50m/s of adjusting gathering-device;

6) on-load voltage of regulating two injection apparatus respectively be 2kV～20kV and-2kV～-20kV; Injection apparatus ejects the fiber that has positive and negative electric charge respectively, the described fiber fibre bundle that formation speed sharply reduces that aloft meets and be attached together; Use air-flow or insulating bar to draw described fibre bundle, begin to collect spinning to the gathering-device surface.

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