Electrostatic spinning system based on enhanced electric field

Abstract

An electrostatic spinning system based on an enhanced electric field comprises a spray head used for spraying a polymer solution to a fiber membrane in an electrostatic coating mode; an adjustable potential difference is established between the receiving end and the spray head, so that the spray head can spray the fiber membrane borne on the receiving end in an electrostatic coating manner. At least part of the fiber membrane is maintained on the receiving end through electrostatic adsorption formed by potential difference, and an electric field amplitude modulation assembly is arranged on the periphery of the nozzle. Wherein the electric field intensity in the influence area of the electric field amplitude modulation assembly is greater than the electric field intensity outside the influence area of the electric field amplitude modulation assembly. The electric field amplitude modulation assembly is adopted by the nozzle, the electric field intensity around the nozzle can be strengthened and stabilized, electrostatic coating can be better conducted on the fiber membrane, and meanwhile an electric field can exist outside an electrostatic coating area to meet the requirement that the fiber membrane is electrostatically adsorbed to the receiving end.

Description

Technical Field

[0001] The invention relates to the field of electrostatic spinning, and in particular to an electrostatic spinning system based on enhanced electric field. Background Art

[0002] Electrospinning is a process that uses a polymer solution or melt to form a jet stream under the action of a strong electric field for spinning. Currently, electrospinning has become a new processing method for preparing ultra-fine fibers and has become a new choice for many textile factories.

[0003] Electrostatic coating means using electrostatic action to attach materials in the form of fibers, droplets or particles to the fiber membrane. In the electrostatic coating process, the situation of producing fibers is called electrostatic spinning, and the situation of producing droplets or particles is called electrostatic spraying. These two situations are sometimes mixed, and sometimes accompanied by airflow in roughly the same direction as the deposition as an aid.

[0004] In the prior art, the general process of electrostatic coating is: the fiber membrane is placed on the transmission device and driven forward, a nozzle for electrostatic spinning is arranged in certain areas relative to the transmission device, and an electric field is applied between the nozzle and the transmission device, so that the directional electrostatic spinning process can be realized. However, electrostatic spinning is only carried out in one area, and outside the electrostatic spinning area, there are parts that are undertaken by the previous process link and the next process link. How to maintain these parts of the fiber membrane on the transmission device becomes a problem. The prior art allows the transmission device to provide support to the fiber membrane by arranging the fiber membrane above the transmission device, but in this case, the spraying process of electrostatic coating can only choose the form of an atomizing nozzle, because if large droplets are formed, the droplets will drip onto the fiber membrane due to gravity, resulting in uneven coating. If a process structure is adopted in which the fiber membrane is arranged below the transmission device, an area where the fiber membrane is easy to fall off and an area where the fiber membrane is not easy to fall off will be formed on the transmission device. Generally speaking, the electrostatic coating position and the area affected by the electric field amplitude modulation component belong to the area where the fiber membrane is not easy to fall off due to the existence of electrostatic adsorption or the fiber membrane is subjected to an external force directed to the receiving end. In addition, the fiber membrane is easy to fall off from the transmission equipment due to gravity or external force directed from the receiving end to the direction of the fiber membrane, so it belongs to the area where the fiber membrane is easy to fall off. At the same time, after the electrospinning is completed, when the fiber membrane needs to be peeled off, how to detach the finished fiber membrane also becomes a problem. It can be seen that on the same transmission equipment, multiple areas are divided according to whether the fiber membrane is easy to detach, whether it is used for electrostatic coating, and whether the fiber membrane needs to be detached. Different areas have different or even completely opposite requirements for the adsorption of the fiber membrane and the transmission equipment.

[0005] How to ensure the stable adsorption and smooth detachment of electrospinning at the receiving end is an issue that electrospinning equipment needs to consider.

[0006] In addition, on the one hand, there are differences in understanding among those skilled in the art; on the other hand, the applicant studied a large number of documents and patents when making the present invention, but due to space limitations, not all details and contents are listed in detail. However, this does not mean that the present invention does not have the characteristics of these prior arts. On the contrary, the present invention already has all the characteristics of the prior art, and the applicant reserves the right to add relevant prior art to the background technology. Summary of the invention

[0007] The existing electrospinning nozzle mainly uses a flat stainless steel needle. The electrostatic field formed by this type of needle port and the electrospinning collector is a point-to-surface form, thus forming an electrostatic field with a high divergence. The prior art often improves the nozzle structure to avoid the problem of fiber floating and unstable jet direction during the spinning process. For example, the patent document with publication number CN211284629U discloses an electrospinning fiber directional coating nozzle, including a flat needle, a horn cover, a conical metal part, a high-voltage electrostatic terminal and a capillary. The flat needle has an opening, the horn cover includes a cover body and a barrel, one end of the barrel is fixedly connected to the middle of the cover body, the conical metal part is arranged in the barrel, one end of the capillary is fixedly connected to one end of the flat needle and connected to the flat needle, and the other end of the capillary extends into the conical metal part and passes through the conical metal part and the cover body in sequence. The main function of the conical metal piece provided in the technical solution is to make the electric field at the tip of the needle more concentrated, so as to make the jet more stable. At the same time, the unique conical metal piece of the nozzle can introduce high-voltage static charge into the needle, further improving the spinning stability. In other words, the purpose of the technical solution to set the metal piece around the needle structure is to limit the electric field to a smaller range, which is completely opposite to the function of expanding the coverage of the electric field to be achieved by the electric field amplitude modulation component provided in the present invention. Even though the above-mentioned prior art also involves a conical metal piece structure, its specific installation method is completely opposite to the electric field amplitude modulation component provided in the present invention, that is, the smallest end of the conical metal piece corresponds to the emission end of the nozzle structure, and the electric field strength at this time can be more concentrated, and the coverage of the electric field cannot be expanded. Based on this, the above-mentioned prior art provides a technical inspiration that is completely opposite to the present invention. In view of the shortcomings of the prior art, the present invention provides an electrospinning system based on an enhanced electric field, comprising: a nozzle for spraying a polymer solution onto a fiber membrane in an electrostatic coating manner, a receiving end, an adjustable potential difference being established between the nozzle and the nozzle so that the nozzle can spray onto the fiber membrane carried on the receiving end in an electrostatic coating manner, the fiber membrane being maintained on the receiving end at least in part by electrostatic adsorption formed by the potential difference, and an electric field amplitude modulation component being arranged around the nozzle, wherein, thanks to the natural enhancement of the electric field strength by the electric field amplitude modulation component, without adding an additional electric field source, the electric field strength within the influence range of the electric field amplitude modulation component is greater than the electric field strength outside the influence range of the electric field amplitude modulation component.

[0008] The conventional arrangement mode of the prior art is to arrange a structure for changing the electric field strength around the spinneret. For example, the patent document with publication number CN104060334A discloses an electrostatic spinning device, including multiple spinnerets, a collecting device, an auxiliary electrode and a high-voltage power supply, the high-voltage power supply is connected to the auxiliary electrode, the auxiliary electrode and the collecting device are arranged in a plate-to-plate manner, and the auxiliary electrode is hollowed out with a circular hole with the same number of spinnerets, and each spinneret is arranged in a circular hole. The technical scheme can significantly improve the uniformity of the working electric field around the spinneret by arranging the auxiliary electrode on the periphery of the spinneret, so that the electric field strength size and change trend of each spinneret are basically the same, thereby improving the spinning efficiency and improving the spinning quality. However, the auxiliary electrode that limits the spinneret in the circular hole in the technical scheme can only form a shielding structure in a direction perpendicular to the central axis of the spinneret, so as to effectively isolate the spinneret, and its main purpose is to achieve the balance of the working electric field near the spinneret, thereby preventing the generation of electric field strength interference between the spinnerets. In addition, the auxiliary electrode and the collecting plate in the technical solution are connected to a high-voltage power supply, so that an electric field strength with the same strength is formed between the auxiliary electrode and the collecting plate, and there is no same voltage between the spinneret and the collecting plate for forming electrostatic spinning, otherwise the polymer solution cannot realize the process of forming electrostatic spinning under the action of the potential difference. On the contrary, the electric field amplitude modulation component provided at the periphery of the nozzle of the present invention can form a directional electric field intensity enhancement area along the central axis direction of the nozzle, thereby improving the electrostatic spinning force in the area. At the same time, the spinneret of the present invention and the receiving directly constitute an electric field for generating an electrostatic spinning effect. At this time, the electric field amplitude modulation component can not only be used as an adjusting component for the electric field intensity of electrostatic spinning, but also as an adjusting component for the force applied during the fiber membrane separation process. The essence of the above-mentioned prior art is to concentrate the electric field intensity of the nozzle, and it is impossible to ensure the stable adsorption and smooth separation of electrostatic spinning at the receiving end by changing the coverage of the electric field intensity of the nozzle. Based on this, those skilled in the art will not adopt the above-mentioned prior art or its combination to solve the technical problems of the present invention.

[0009] Preferably, an electrospinning system based on an enhanced electric field comprises: a nozzle for spraying a polymer solution onto a fiber membrane in an electrostatic coating manner; a receiving end, an adjustable potential difference is established between the nozzle and the receiving end so that the nozzle can spray onto the fiber membrane carried on the receiving end in an electrostatic coating manner, and the fiber membrane is maintained on the receiving end at least partially by electrostatic adsorption formed by the potential difference. A metal directional cover is arranged around the nozzle, and a voltage with the same positive and negative voltage as the nozzle voltage is applied to the metal directional cover or the equipotential is directly formed with the nozzle.

[0010] Compared with the above-mentioned prior art, the electric field amplitude modulation component arranged on the periphery of the nozzle of the present invention can enhance the electric field strength within a certain range. Based on the above-mentioned distinguishing technical features, the problems to be solved by the present invention may include: how to ensure the stable adsorption and smooth detachment of electrostatic spinning at the receiving end by adjusting the force between the nozzle and the receiving end. Specifically, in the prior art, the common structure of electrostatic spinning by electrostatic spraying is: a conveying device capable of moving the fiber membrane is provided; above the conveying device, some nozzles for spraying electrostatic spinning materials are provided, and voltages with opposite polarities are respectively connected to the nozzle and the conveying device, so that there is a certain potential difference between the nozzle and the conveying device, that is, an electric field is formed between the nozzle and the conveying device. The electrostatic spinning material sprayed out by spraying carries a certain charge, and the charged material is sprayed to the fiber membrane in a direction under the action of the electric field force of the electric field, thereby realizing electrostatic spinning. However, the shedding characteristics of the fiber membrane on the conveying device are different. According to whether the fiber membrane is easy to fall off from the conveying device, the conveying device area can be divided into an area where the fiber membrane is easy to fall off and an area where the fiber membrane is not easy to fall off. Since part of the force that maintains the fiber membrane on the conveying equipment comes from the electrostatic adsorption effect brought by the electric field, the area where the fiber membrane is not easy to fall off usually overlaps with the electrostatic coating area, and the area where the fiber membrane is easy to fall off usually overlaps with the non-electrostatic coating area. Not all areas are used for electrostatic coating, especially for roller-shaped conveying equipment. In the area where the fiber membrane is not easy to fall off, the fiber membrane is relatively more subjected to the force of maintaining it on the conveying equipment, because the electrostatic effect brought by the application of the electric field will cause the fiber membrane to adhere to the conveying equipment. In the area where the fiber membrane is easy to fall off, there is often no electric field or the electric field effect is small. Therefore, some technologies may think of applying the same electric field to the entire conveying equipment range to maintain the attachment of the fiber membrane. However, on the one hand, increasing the range of the electric field means increasing the cost, especially like this scheme, many electrostatic coating processes will use high voltage, and expanding the range means increased energy consumption and cost, and may even cause part of the electrostatic coating to occur in unexpected places. On the other hand, there are also areas where the fiber membrane needs to be detached, such as the stage of peeling off the fiber membrane after the electrostatic coating is completed, and the force that promotes attachment becomes an obstacle instead. Based on this, the present invention uniquely designs an electric field amplitude modulation component. For example, it can be an electric field amplitude modulation component of a metal directional cover structure. Within the influence range of the directional cover, the electric field will be further enhanced to meet the requirements of electrostatic spinning. In other words, the electric field applied between the nozzle and the fiber membrane as a whole can be reduced. On the one hand, it reduces the cost of maintaining the attached state of the fiber membrane, and on the other hand, it also provides a basis for the subsequent easy peeling of the fiber membrane. In addition, the directional cover can prevent the ejected electrostatic coating material from escaping to the external non-electrostatic coating area in terms of physical structure, thereby ensuring the quality of the electrostatic coating product.

[0011] This solution is particularly suitable for the process type of upward spraying of polymer. The prior art will choose to adopt the downward spraying method because it is necessary to keep the fiber membrane on the roller. That is to say, in this case, the fiber membrane moves in the upper part of the roller, and the fiber membrane can be kept on the roller by gravity. The downward spraying method of the prior art can only be applied to the spraying method of the needle nozzle, because if the spraying is carried out in a non-atomized manner, large particles of droplets will drip onto the fiber membrane, resulting in an unsatisfactory spraying effect. However, the upward spraying method can be adopted by adopting this solution. Therefore, in addition to the needle spraying solution, the line spraying and chain spraying solutions can also be adopted, which can be applied in a wider range. In the fiber membrane transmission mode of this solution, the fiber membrane moves in the lower part of the roller, so the fiber membrane will fall down due to gravity. This solution uses the electrostatic adsorption effect formed by the electric field on the receiving end to counteract the gravity of the fiber membrane, so that the fiber membrane can still be kept on the receiving end. Since the adsorption effect achieved by the electric field of electrostatic spraying is directly utilized, the cost of using other means to keep the fiber membrane attached is significantly reduced or avoided. Normally, the electric field strength required to electrostatically adsorb the fiber membrane on the receiving end is less than the electric field strength around the electrostatic coating nozzle. The electric field applied to the entire receiving end or at least to a larger area of ​​the receiving end in this scheme is a relatively small electric field, and its electric field size can make the fiber membrane appropriately electrostatically adsorbed on the receiving end. However, the above-mentioned electric field size is usually not enough for the electric field strength requirement around the nozzle required for electrostatic coating. Therefore, this scheme innovatively proposes an electric field amplitude modulation component and a method of using the amplitude modulation component to adjust the electric field. First, this scheme cleverly uses the adsorption effect generated by the electric field to enable the fiber membrane to resist gravity and attach to the lower half of the receiving end. Secondly, this scheme hopes that the aforementioned relatively small electric field used to generate electrostatic adsorption can be upgraded to an electric field strength that can be used for electrostatic coating within the desired range without having to change the potential difference between the amplitude modulation component and the receiving end to meet the requirements of electrostatic coating. The electric field amplitude modulation component proposed in this scheme can enhance the electric field within the specific range defined by it, so that the nozzle within this range can complete electrostatic coating with sufficient electric field strength. The electric field amplitude modulation component proposed in this scheme can have multiple implementation forms. In one embodiment, the electric field amplitude modulation component is in the structural form of a metal directional cover, which is arranged around the nozzle and contains the nozzle therein. The electric field amplitude modulation component in the form of a metal directional cover has the effect of gathering the electric field, so that the electric field strength can be increased to meet the needs of electrostatic coating within the influence range of the metal directional cover. The metal directional cover can also limit the diffusion range of the polymer sprayed from the nozzle, which can reduce the undesired polymer diffusion and improve the coating effect. Preferably, when the metal directional cover is set, the nozzle of the nozzle is higher than the opening of the metal directional cover. In another embodiment, the electric field amplitude modulation component is a metal wire, and the metal wire is arranged on the periphery of the nozzle. Preferably, at least two metal wires are respectively arranged on both sides of the nozzle.The metal wire is connected to a voltage greater than or equal to that of the nozzle, thereby enhancing the electric field strength within the influence range so that the electric field strength within the influence range of the nozzle can meet the requirements of electrostatic coating. Preferably, when the metal wire is provided, the nozzle of the nozzle is higher than the top of the metal wire.

[0012] On the other hand, the present solution can also add functional materials, such as antibacterial, anti-mite, deodorant and other materials, to the polymer when preparing the electrostatically coated fiber membrane. When adding materials with electrical properties such as metal elements, metal salts, and graphene, the electrical properties of the materials will weaken the effect of the electric field, thereby affecting the electrostatic coating effect and may cause the coating to fail. Compared with the above-mentioned prior art, the present invention can add electrical materials to the polymer solution as needed. Based on the above-mentioned distinguishing technical features, the problems to be solved by the present invention may include: how to overcome the influence of the polymer solution with electrical properties on the electrostatic coating process. The electric field amplitude modulation component designed in this solution can offset the influence of the electromagnetic properties of the material on the electrostatic coating, and can enable the above-mentioned materials to be smoothly coated when the same electric field is added. Therefore, the electric field amplitude modulation component of this solution can complement the process of adding functional materials, and can ensure that both electrical and non-electrical materials can be coated on the fiber membrane. The production process selection is wider.

[0013] Preferably, the electric field amplitude modulation component can be a metal directional cover, which is sleeved on the outside of the nozzle, and the cross-sectional size of the metal directional cover gradually increases. In the case of a small number of nozzles, the metal directional cover can be configured as a cylindrical sleeve structure. Preferably, the electric field amplitude modulation component is placed in the electric field formed by the potential difference between the nozzle and the receiving end, wherein the electric field strength within the influence range of the electric field amplitude modulation component is greater than the electric field strength outside the influence range of the electric field amplitude modulation component, so that the nozzle can just use the electric field strength within the influence range of the electric field amplitude modulation component to complete the expected electrostatic coating process, and at the same time, it can just use the objective law of the decrease in electric field strength when away from the electric field amplitude modulation component to achieve a simple separation of the fiber membrane from the receiving end. The simple separation here means that the electric field strength outside the influence range of the electric field amplitude modulation component can be set to just meet the amplitude size of the fiber membrane attached to the receiving end through electrostatic adsorption. In this case, only a small force needs to be applied to the outlet of the fiber membrane to the next process, such as a peeling force generated by a small inclination angle, so that the fiber membrane can be smoothly separated from the receiving end. The electric field amplitude modulation component designed in this scheme can make the separation of the fiber membrane simpler and smoother.

[0014] This solution specially designs the intensity of the entire electric field, so that in the area where the fiber membrane is easy to fall off, the electrostatic adsorption formed by the electric field can just ensure that the fiber membrane is attached to the receiving end and will not fall off, and in the electrostatic coating area, the electric field enhanced by the electric field amplitude modulation component can meet the requirements of electrostatic spinning. Therefore, this solution can achieve the effect of maintaining the flatness of the fiber membrane and ensuring the quality of electrostatic spinning on the basis of controlling costs.

[0015] Preferably, the nozzles are arranged around the circumference of the receiving end, with the number being two or more, to form an electrostatic coating area at the corresponding position on the receiving end, and the non-electrostatic coating area formed at the remaining position on the receiving end serves as the area to connect the previous link and the next link.

[0016] Preferably, the receiving end is configured as a permeable structure, and is further provided with an adjustment component, which can achieve the purpose of specifically adjusting the force applied to the fiber membrane at the corresponding position based on the area where the fiber membrane is located.

[0017] Preferably, in the area where the fiber membrane is easy to fall off from the receiving end, the attachment component increases the adsorption force from the inside of the receiving end to the inside of the receiving end or increases the blowing force from the outside of the receiving end to the inside of the receiving end, so that the fiber membrane can be attached to the receiving end.

[0018] Preferably, when the fiber membrane needs to be detached from the receiving end, especially when taking over the next link area, the attachment component reduces the adsorption force from the inside of the receiving end to the inside of the receiving end or reduces the blowing force from the outside of the receiving end to the inside of the receiving end, so that the fiber membrane can loosen from the surface of the receiving end.

[0019] Preferably, the system further comprises a fiber combing section and a first conveying section, wherein the fiber combing section processes the fiber raw material into a mesh-shaped first fiber membrane, and the first fiber membrane is transmitted to a receiving end of the electrostatic coating section through the first conveying section.

[0020] Preferably, the second fiber membrane formed after the electrostatic coating treatment in the electrostatic coating section passes through the processing section, which is a temperature control device, and the second fiber membrane entering the processing section is heated or cooled and then enters the collecting section.

[0021] Preferably, the second fiber membrane formed after the electrostatic coating treatment by the electrostatic coating section passes through the processing section, which is a pressing device, and processes the second fiber membrane through one or more of room temperature pressing, cooling pressing, hot pressing, ultrasonic pressing, gluing, and compounding, and then enters the collecting section.

[0022] Preferably, the second fiber membrane formed after the electrostatic coating treatment by the electrostatic coating section passes through the processing section, and the processing unit processes the second fiber membrane into the shape of a pile, a ball, a roll, a strip, a strand, a rope or a line, and then enters the collecting unit.

[0023] Preferably, the second fiber membrane formed after the electrostatic coating treatment in the electrostatic coating section passes through the processing section, which is a temperature control device, and the second fiber membrane entering the processing section is heated or cooled and then enters the collecting section.

[0024] Preferably, the second fiber membrane formed after the electrostatic coating treatment by the electrostatic coating section passes through the processing section, which is a pressing device, and processes the second fiber membrane through one or more of room temperature pressing, cooling pressing, hot pressing, ultrasonic pressing, gluing, and compounding, and then enters the collecting section. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic structural diagram of the electrostatic coating area of ​​the system provided by the present invention;

[0026] Figure 2 It is a schematic diagram of the overall structure of the system provided by the present invention;

[0027] Figure 3 It is a schematic diagram of the system process flow provided by the present invention;

[0028] Figure 4 It is a schematic diagram of the structure of the electrostatic coating area of ​​the system under another embodiment provided by the present invention.

[0029] In the figure: 100, nozzle; 110, electric field amplitude modulation component; 200, receiving end; 210, adjustment component; 300, first fiber membrane; 310, second fiber membrane; 400, fiber combing part; 500, first transmission part; 510, second transmission part; 600, processing part; 700, collecting part. DETAILED DESCRIPTION

[0030] The following is combined with Figures 1 to 4 Provide detailed explanation.

[0031] This scheme proposes an improvement scheme for electrostatic spinning. Electrostatic spinning is a process that uses a polymer solution or melt to form a jet stream under the action of a strong electric field for spinning. Because this process can produce ultra-fine fiber products, it has become a new process chosen by many textile factories. Electrostatic coating refers to the process of attaching substances in the form of fibers, droplets or particles to a fiber membrane using electrostatic action. The process of producing fibers by electrostatic coating referred to here is generally called electrostatic spinning, and the process of producing droplets or particles is generally called electrostatic spraying. These two processes may occur simultaneously in some cases, and in some cases they may be accompanied by an airflow in a direction roughly the same as the deposition direction as an aid. The droplets or particles formed by electrostatic coating are not necessarily spherical, but may be irregular in shape. The fibers formed by electrostatic coating generally refer to linear objects, and their cross-sections are not limited to circles, and the cross-sectional dimensions and shapes at various locations are not necessarily consistent. The meaning of the above-mentioned "attachment" includes, but is not limited to, attachment to the surface of the fiber membrane, inclusion in the interior of the fiber membrane, immersion in the interior of the fiber membrane, and other mutually arranged relationships.

[0032] The current electrospinning technology has the problem of how to stably adsorb and smoothly detach the fiber membrane from the transmission equipment that serves as the carrier.

[0033] like Figure 2 and Figure 3 As shown, based on the above, the present invention provides an electrostatic spinning system based on an enhanced electric field. The system may include a fiber combing unit 400, a first conveying unit 500, an electrostatic coating unit, a second conveying unit 510, a processing unit 600 and a collecting unit 700. In terms of the process flow direction, the above-mentioned units are connected in sequence, and the fiber material is combed by the fiber combing unit 400 to form a flat and orderly target shape, and is transmitted to the electrostatic coating unit through the first conveying unit 500; after the electrostatic coating process is carried out in the electrostatic coating unit, it moves through the second conveying unit 510; after being processed by the processing unit 600 set in the middle, the processed fiber material is collected by the collecting unit 700. The electrostatic spinning system may also include components for storage, pretreatment and other links of the fiber material, and the present invention does not limit this. The rotation direction (counterclockwise) of the electrostatic coating receiving end 200 is the same as the running direction and transmission speed of the second conveyor belt (counterclockwise), and is opposite to the running direction of the first conveyor belt (clockwise), and the transmission speed is the same.

[0034] The function of the fiber combing unit 400 is to process the evenly distributed blended fibers into the first fiber membrane 300. The processing method can be, for example, to squeeze the evenly distributed blended fibers through a roller machine to form a relatively compact first fiber membrane 300. The fiber clusters are processed by the combing device to form a fiber web, which constitutes the first fiber membrane 300. The fiber combing unit 400 can have a roller component. The fibers of the first fiber membrane 300 are natural fibers, chemical fibers, mixed fibers of natural materials and chemical materials, or mixed fibers of natural fibers and chemical fibers. One or more of the fibers can be long fibers, short fibers, or long-short mixed fibers.

[0035] The function of the first conveying unit 500 is to convey the first fiber membrane 300 prepared by the fiber combing unit 400 to the subsequent process steps. Figure 2 As shown, the first conveying part 500 may include a conveyor belt structure and a first fiber membrane 300 conveying structure, and the first fiber membrane 300 conveying structure is connected to the outlet of the fiber combing part 400, and is used to convey the first fiber membrane 300 to the conveyor belt. The first fiber membrane 300 conveying structure may adopt a double roller wheel structure, at least one part of the side of the wheel contacts each other, and a gap is left at the contact position to allow the first fiber membrane 300 to pass through. The wheels can rotate along their respective centers of circles, so that the first fiber membrane 300 placed thereon can be driven to move, and when passing through the gap of the wheels, the first fiber membrane 300 can be pressed twice. The first fiber membrane 300 conveying structure plays the role of removing the first fiber membrane 300 from the fiber combing part 400 and changing its moving direction. In other embodiments, the fiber combing part 400 may not have a wheel structure. The conveyor belt may be a conveyor belt structure, which has rollers placed at both ends and a belt arranged around the two rollers, and the belt rotates by rotating the rollers, thereby driving the first fiber membrane 300 on the conveyor belt to move.

[0036] like Figure 2 As shown, the first fiber membrane 300 enters the electrostatic coating section after passing through the first conveying section 500, and is formed into the second fiber membrane 310 through the electrostatic coating link of the electrostatic coating section. The electrostatic coating section may include a receiving end 200 and a spraying unit. In this embodiment, the receiving end 200 is configured as a drum structure, and the rotation direction of the receiving end 200 is opposite to the running direction of the first conveyor belt (clockwise). The first fiber membrane 300 is attached to the circumferential surface of the drum of the receiving end 200 and moves with the rotation of the receiving end 200. The spraying unit is arranged on the outside of the receiving end 200, and its function is to apply a spraying substance (fiber, droplets or particles) to the first fiber membrane 300 attached to the circumferential surface of the receiving end 200 to prepare the first fiber membrane 300 into the second fiber membrane 310. As Figure 1As shown, the spray unit includes a nozzle 100 arranged along the circumference of the receiving end 200 and outside the receiving end 200, a spinning liquid supply component connected to the nozzle 100, and an electric field generating component. The electric field generating component includes at least a positive and a negative electrode, and the polarity of the part located at the nozzle 100 is opposite to the polarity of the part located at the receiving end 200, so that a directional electric field is formed between the nozzle 100 and the receiving end 200. Under the action of the electric field, the spraying material sprayed by the nozzle 100 adheres to the first fiber membrane 300 to complete the electrostatic coating. After the coating is completed, the second fiber membrane 310 can be forced to separate from the receiving end 200 by a separation structure arranged on one side of the receiving end 200. The separation structure can be a wedge-shaped platform structure, and the bottom of its inclined surface is aligned with the position of the receiving end 200, so that the second fiber membrane 310 can be separated from the receiving end 200 with the help of the separation structure. In other embodiments, the separation structure is not necessary. In the case of continuous production, one end of the second fiber membrane 310 is connected to the next link, and the subsequent second fiber membrane 310 will be automatically peeled off from the receiving end 200.

[0037] A potential difference is established between the nozzle 100 and the receiving end 200 in the electrostatic coating mechanism, and the potential difference forms an electric field. Normally, the nozzle 100 and the receiving end 200 apply opposite positive and negative voltages. The first fiber membrane 300 is attached to the peripheral surface of the electrostatic coating receiving end 200 due to electrostatic adsorption in the electric field. The nozzle 100 in the electrostatic coating mechanism is connected to a high-voltage power supply and a coating liquid containing device. Fibers, particles, droplets or a mixture of the above are generated at the end of the nozzle 100 and are displaced to the first fiber membrane 300 under the action of the electric field. The nozzle 100 in the electrostatic coating mechanism can be a structure or mechanism for outputting the coating liquid. The embodiment of the present invention selects a needle tube structure nozzle 100. Thanks to the unique design of this solution, the spraying structure of this electrostatic coating can also select a line coating or chain coating nozzle.

[0038] The potential difference between the nozzle 100 and the receiving end 200 can be adjusted, and the distance between the nozzle 100 and the receiving end 200 can be adjusted. The number of nozzles 100 in the electrostatic coating mechanism is usually preferably more than 2. The rear end of the nozzle 100 is connected to a liquid supply device, and the polymer solutions used in each nozzle 100 can be the same or different. The polymer must be soluble, such as polyacrylonitrile, polyurethane, modified polyurethane, polystyrene resin, polyphenylene ether resin, polyvinylidene fluoride, polylactic acid chitin, chitosan, silk protein, etc. Additives can be added to the polymer solution to play a functional role.

[0039] The electrostatically coated nozzle 100 has corrosion resistance, flexibility and durability. The nozzle 100 can be made of a conductive material, preferably one or a mixture of stainless steel, nickel-titanium alloy, aluminum alloy, tungsten-molybdenum alloy, cobalt-manganese alloy, titanium alloy, tantalum, cobalt, titanium, iron, aluminum, nano-carbon, etc. The nozzle 100 can be made of an insulating material, preferably polytetrafluoroethylene.

[0040] The second fiber membrane 310 passes through the processing section 600 before entering the collecting section 700. The processing section 600 is a temperature control device. The second fiber membrane 310 is heated or cooled in the processing section 600 and then enters the collecting section 700.

[0041] The processing unit 600 is a pressing device, which processes the second fiber membrane 310 through one or more of normal temperature pressing, cooling pressing, hot pressing, ultrasonic pressing, gluing, and compounding, and then enters the collecting unit 700. The processing unit 600 processes the second fiber membrane 310 into a shape of a pile, a ball, a roll, a strip, a strand, a rope, or a line, and then enters the collecting unit 700.

[0042] Example 1

[0043] In the above-mentioned electrostatic coating link, in one embodiment, the electrostatic spinning process parameters are: the electrostatic spinning applied voltage is 5-20KV, the receiving distance is 10-15cm, the spinning temperature is 23-27℃, and the relative humidity of the environment is 25-35%. The receiving distance can refer to the straight-line distance from the nozzle 100 to the receiving end 200. Based on the above-mentioned process parameters, two sub-embodiments are given. The embodiment of group A is a needle-type nozzle 100 arrangement, and the nozzle 100 is directly aligned with the receiving end 200 for spinning, such as Figure 4 As shown; in the embodiment of group B, a metal directional cover is provided outside the nozzle 100, and the nozzle 100 is aligned with the receiving end 200 for spinning, as shown Figure 1 The first fiber film 300 is transmitted to the drum receiving end 200, and the sprayed material is selected as cotton short fibers. The cotton short fibers are adsorbed to the first fiber film 300 under the action of the high-voltage electrostatic field. For Group A and Group B, the electrostatic spraying results under different voltages are shown in the following table.

[0044]

[0045] It can be seen that Group A experienced shedding after electrostatic coating at relatively low voltages (3KV and 5KV), while Group B experienced no shedding in the voltage range from low to high voltage.

[0046] The present invention provides another embodiment, which still adopts the electrostatic coating structure of groups A and B, and the material to be sprayed is selected as a blended yarn, and the blended yarn is adsorbed to the first fiber membrane 300 under the action of the high-voltage electrostatic field. For groups A and B, the electrostatic spraying results under different voltages are shown in the following table.

[0047]

[0048] It can be seen that Group A experienced shedding after electrostatic coating at relatively low voltages (7KV and 9KV), and Group B experienced shedding after electrostatic coating at 7KV.

[0049] In experiments where fibers of other materials are selected as the first fiber membrane 300 , the applicable voltage range of group B is greater than that of group A.

[0050] like Figure 1 As shown, therefore, the present invention proposes a preferred electrostatic coating part modification scheme, that is, an electric field amplitude modulation component 110 is set on the outer layer of the nozzle 100, so that the nanofiber directional induced deposition effect is obvious, the voltage can be significantly increased in the spinning interval, the uniformity of the deposited nanofibers is significantly improved, and the electric field force on the second fiber membrane 310 after spinning is less than that in the spinning interval, and it is gently adsorbed on the receiving end 200, which is convenient for separation from the receiving end 200 later. In one embodiment, the electric field amplitude modulation component 110 is a metal directional cover structure. Preferably, the metal directional cover can select a conical cover structure, the opening size is preferably 60°-150°, and the plane where the wide mouth is located is 1-5 cm away from the pinhole of the nozzle 100, and the preferred embodiment is 2 cm.

[0051] The metal directional hood is roughly structured as a conical hood, and the cross-sectional radius of the metal directional hood gradually increases along the bottom of the nozzle 100 toward the nozzle of the nozzle 100. The metal directional hood surrounds the outside of the nozzle 100, and the opening direction of its hood is consistent with the nozzle 100, and is aligned with the receiving end 200. When the number of nozzles 100 is small, the metal directional hood can be configured as a cylindrical sleeve structure. In general, the cross-section of the metal directional hood is larger than the nozzle 100 to form an electrostatic spinning range. The material, shape, size, and position of the metal directional hood can be designed according to the specific situation, and the metal directional hood is applied with a voltage with the same positive and negative voltage as the nozzle 100 or directly connected to the nozzle 100 voltage. The metal directional hood can not only play a role in enhancing the directionality of the ejected material of the nozzle 100, but also enhance the electric field between one side of the nozzle 100 and one side of the receiving end 200. Within the influence range of the directional hood, the enhanced electric field can help the fiber membrane to be more easily adsorbed on the receiving end 200; outside the influence range of the directional hood, the electric field strength is weakened compared to the influence range of the directional hood, and the fiber membrane is more likely to detach from the receiving end 200. The electric field within the physical structure range of the electric field amplitude modulation component may have an enhanced part and a weakened part. The influence range referred to in this solution refers to the range in which the electric field is enhanced by the electric field amplitude modulation component.

[0052] Preferably, the present invention also pays attention to the following problem. In the prior art, the fiber membrane is usually maintained on the receiving end 200 by utilizing electrostatic action. However, although the fiber membrane is usually in contact with most of the surrounding side of the receiving end 200, the surrounding side of the receiving end 200 is not all electrostatic coating area, because some positions need to be reserved for the access of the previous link and the access of the next link. This makes the fiber membrane on the receiving end 200 have two states: easy to fall off and not easy to fall off, and the two states are different at different positions of the receiving end 200, especially at the above-mentioned access and access positions, the adsorption force of the roller receiving end 200 on the fiber membrane is significantly reduced, and the fiber membrane is easy to fall off here. The conventional way of thinking may choose to increase the coverage of the electric field, such as increasing the coverage area of ​​the electric field electrode so that the generated electric field can cover the above-mentioned area. However, this approach significantly increases the cost on the one hand, because these parts do not participate in electrostatic coating, and applying an electric field to this part, especially this scheme will use a high voltage electric field, and the waste generated is large. On the other hand, the widening of the electric field range will cause some of the charged substances that escape or float in the environment to be deposited on the fiber membrane in an unexpected manner in an unexpected area, which will significantly reduce the electrostatic coating effect and reduce the quality of the finished product. On the one hand, this solution chooses to set the adjustment component 210 in the part where the above-mentioned fiber membrane is easy to fall off. On the other hand, more importantly, a covering electric field can also be set in the entire receiving end 200 area. However, the overall electric field strength is low. By setting an electric field amplitude modulation component in the nozzle area, the electrostatic coating material gathered in the range of influence of the electric field amplitude modulation component is directionally coated on the fiber membrane through the enhanced electric field of the electric field amplitude modulation component. The above scheme realizes the use of a relatively low electric field in the area where the fiber membrane is easy to fall off to assist the fiber membrane to maintain on the receiving end 200, and at the same time, the function of the electric field amplitude modulation component that conforms to objective laws to enhance the electric field in the electrostatic coating area is used to enhance the electric field only in the coating area, thereby achieving the provision of different sources of attachment support according to different positions of the fiber membrane on the receiving end 200 while ensuring a relatively low cost of use. In one embodiment, the electric field applied to the entire receiving end, or at least the electric field applied to the receiving end area where the fiber membrane passes, is applied to the receiving end in an integrated manner. This electric field is used to maintain the fiber membrane on the receiving end. The overall application of the electric field in this embodiment makes the magnitude of the electric field force (or electrostatic adsorption force) on the fiber membrane within the arc surface on which the electric field is applied on the receiving end basically consistent, and the direction is basically perpendicular to the tangential direction of the arc surface (or the center direction of the arc surface). Due to the different positions of the fiber membrane on the receiving end, the minimum force required to resist its gravity and maintain it on the receiving end is actually different, because the direction of gravity is always perpendicular to the ground, and the direction of the force changes relatively.For example, at the lowest point of the receiving end, the direction of gravity and the direction of the action force are just opposite to each other, and the action force directly offsets gravity; while at the non-lowest point position, the situation becomes that the component of the action force in the vertical direction offsets gravity. Under this embodiment of the overall application of the electric field, the so-called electric field strength that can maintain the fiber membrane on the receiving end can be the electric field strength that can still maintain the fiber membrane on the receiving end when the component of the action force in the direction perpendicular to the ground is the smallest. The so-called position where the component of the action force in the direction perpendicular to the ground is the smallest is roughly the position where the tangent of the arc surface on the receiving end is perpendicular to the ground, where the component of the action force in the direction perpendicular to the ground is almost 0. At this position, the action force relies on squeezing the fiber membrane toward the receiving end so that the fiber membrane forms a static friction force with the receiving end to maintain the fiber membrane on the receiving end. As long as the overall electric field meets the above-mentioned "minimum component" situation, the fiber membranes at other positions on the receiving end can also be stably adsorbed on the receiving end. In another embodiment, the electric field strength can also be configured in sections, and multiple electric fields are set based on the rule that the force applied in the direction of the tangent of the arc at different positions on the receiving end can just offset the gravity of the fiber membrane at that position in the direction perpendicular to the ground. The configuration method can be to apply different voltages to multiple electrodes respectively, so that the electric field can more accurately keep the fiber membrane at different positions on the receiving end, saving a certain amount of consumption, but the structure of this embodiment is relatively complex and the deployment cost is relatively high, and users need to implement it as needed. In order to avoid circumvention design, it is also possible to think of a solution that can directly provide an electric field that is directly opposite to the gravity direction of the fiber membrane at each location through design. However, this solution may affect the electric field effect of electrospinning because it forms a large number of electric fields with different directions, and the deployment cost is also high, so users need to implement it with caution.

[0053] like Figure 4 As shown, in another embodiment, the electric field amplitude modulation component 110 is a metal wire structure. Metal wires are respectively arranged on both sides of the nozzle, and a voltage greater than or equal to the nozzle is applied to the metal wires, so that the electric field within its influence range is enhanced.

[0054] During the implementation process, the shape of the metal wire can be selected from irregular shapes such as straight line, wavy, zigzag, etc. When there is an angle between the setting direction of the metal wire and the plane where the nozzle is located, that is, the angle between the setting direction of the metal wire and the plane where the nozzle is located is not zero, the electric field can be enhanced to meet the intensity of electrostatic coating. The setting direction of the metal wire can be understood as if the metal wire is regarded as a rod (the wavy or zigzag shape can be approximately equal to the rod shape of the line connecting the head end to the tail end), then the axial direction of the rod is the setting direction. The plane where the nozzle is located can be understood as the coplanar where the axes of two adjacent nozzles are located. In another understanding, it can also be said that the setting direction of the metal wire is non-codirectional (or non-parallel) with the axial direction of the nozzle. The metal wire is set in the middle gap between the two nozzles.

[0055] Example 2

[0056] In this embodiment, the electrospinning solution is a polyethylene solution, to which silver short fibers and antibacterial and antimicrobial polyester fibers are added. The first spinning fiber membrane is silk fiber, and the silk fiber yarn has excellent wrinkle resistance, breakage resistance and water wash resistance.

[0057] The distance between the spinning needle and the negative electrode roller is 10-15 cm, the voltage is maintained at 10-20 KV, the spinning speed is 0.5-1.5 ml / h, and the mass ratio of nanofiber to short fiber in the blended fiber is 1:250 to 1:50.

[0058] After the spinning process, 10 points of the obtained second fiber were selected for performance testing, and the second fiber membrane 310 (2 cm 2 ×2cm 2 ), take 100 μl of mutans streptococcus solution on the second fiber membrane 310, evenly spread it, and place it in a carbon dioxide incubator for 48 hours. Scan the diluted coated plate and calculate the antibacterial property, that is, the number of microbial killing logs = 1g (blank control group colony count / experimental colony count). The antibacterial performance results for mutans streptococcus are as follows:

[0059]

[0060] It can be seen that the method of this embodiment effectively improves the antibacterial performance of the fiber membrane and the spinning is uniform.

[0061] After the spinning process, the obtained second fiber was selected for performance testing at 5 points, and the final twisted yarn was cut to obtain the fabric (5 cm 2 ×5cm 2 ), the performance test of the fabric obtained by the final twisting was carried out, and the results are as follows:

[0062]

[0063] It can be seen that the method of this embodiment effectively improves the dimensional stability of the fiber membrane, and the spinning is uniform, ensuring the air permeability of the original fiber membrane.

[0064] Example 3

[0065] The drum receiving end 200 is provided with an adjustment and attachment component 210. The adjustment and attachment component 210 is a component arranged inside or outside the receiving end 200, which can apply a directional force to the fiber membrane in contact with the outer surface of the receiving end 200, so that the fiber membrane can contact the receiving end 200 in a manner closer to the receiving end 200. When the adjustment and attachment component 210 is arranged inside the receiving end 200, it can be an air suction device, which can form a negative pressure inside the receiving end 200, and adsorb the fiber membrane on the receiving end 200 through the holes opened on the surface of the receiving end 200. When the adjustment and attachment component 210 is arranged outside the receiving end 200, it can be an air blowing device, which can blow gas to the surface of the receiving end 200 in a directional manner, preferably blowing gas in a direction perpendicular to the surface of the receiving end 200, so that the fiber membrane can be more closely attached to the receiving end 200. By adsorption, the first fiber membrane 300 and the roller are made closer together, so that a smaller voltage can be used to achieve electrostatic spinning. At the same time, the air pressure at the receiving end 200 of the roller becomes smaller, which is more conducive to peeling off the fiber membrane.

[0066] More preferably, the adjustment and attachment component 210 applies a force to the fiber membrane in contact with the receiving end 200 based on the setting position, so that it is closer to the receiving end 200 or farther away from the receiving end 200. The outer surface of the receiving end 200 is at least permeable to gas, for example, it is provided with a structure such as a vent hole. On the receiving end 200, it is necessary to maintain the fiber membrane adsorbed in the area of ​​the receiving end 200 (the electrostatic coating area and the area connected to the previous link), and the adjustment and attachment component 210 provides a force to keep the fiber membrane on the receiving end 200 by sucking air from the outside of the receiving end 200 to the inside or by blowing air from the outside of the receiving end 200 to the inside. The electrostatic coating area refers to the area opposite to the area where the nozzle 100 is provided, and the fiber membrane passing through the area is subjected to the electrostatic coating operation. This area is usually a partial arc area on the side of the receiving end 200, and in other areas of the receiving end 200, the fiber membrane does not contact the electrostatic spinning material to be sprayed. In the area where the fiber membrane needs to fall off from the receiving end 200, the adjustment and attachment component 210 provides a force to reduce the fiber membrane from peeling off the receiving end 200 by blowing air from the inside of the receiving end 200 to the outside or by pumping air from the inside of the receiving end 200 to the outside. The area where the fiber membrane needs to fall off from the receiving end 200 is the transition area between the receiving end 200 and the next link. The next link is the second conveying part 510. The treated second fiber membrane 310 is separated from the receiving end 200 here and transported to the subsequent link by the second conveying part 510. Therefore, the area where the fiber membrane needs to fall off from the receiving end 200 is adjacent to the area related to electrostatic coating, but the direction of the force applied to the fiber membrane by the adjustment and attachment component 210 in the two areas is opposite. The above-mentioned adjustment and attachment component 210 realizes the effect of stabilizing and flattening the fiber membrane on the receiving end 200 during the electrostatic coating process, and making it easier to separate the second fiber membrane 310 from the receiving end 200 when it is necessary to peel off the second fiber membrane 310 to enter the next link.

[0067] After the first fiber membrane 300 is conveyed to the receiving end 200 by the first conveyor belt and before being peeled off from the receiving end 200, it needs to be well adsorbed on the receiving end 200. If the electric field between the nozzle 100 and the receiving end 200 is not sufficient to achieve the desired adsorption effect, a directional hood and / or an aspirator are needed to achieve the desired adsorption effect. When the fiber membrane needs to be peeled off from the receiving end 200, it needs to leave the area affected by the directional hood and a blowing mechanism can be used at the same time.

[0068] Example 4

[0069] Preparation of medical antibacterial dressing: applied voltage is 15-45KV, spinning spacing is 15-20cm, spinning environment temperature is 22-24°C, spinning environment humidity is 50-60%; preferably, the distance between the nozzle 100 and the roller receiving end 200 is 15cm, the voltage is maintained at 17KV, and the spinning speed is 0.8ml / h.

[0070] Referring to Example 2, the electrospinning solution carrier is at least one of polyurethane, polystyrene, polyvinyl pyrrolidone, polymethyl methacrylate, polymethyl terephthalate, polyvinyl alcohol, polyvinyl chloride, and polyvinylidene fluoride.

[0071] The antibacterial group is one or more of chitosan, collagen, polyethylene glycol, silk fibroin, silk fibroin, polylactic acid, polyvinyl alcohol, and alginate.

[0072] After being processed in the steps of Example 2, the obtained fabric was tested for air permeability, antibacterial property and ductility.

[0073]

[0074] Example 5

[0075] The electrospinning process parameters are as follows: the electrospinning applied voltage is 50 KV, the distance between the nozzle 100 and the receiving end 200 is 8 cm, the spinning temperature is 23-27° C., and the relative humidity of the environment is 25-35%.

[0076] Additives are added to the polymer solution to play a functional role, for example, adding an antibacterial solution, such as a polymer solution containing silver or silver ions, or a polyethyleneimine antibacterial functionalized polymer solution. Adding an antibacterial solution can play an antibacterial role.

[0077] For example, the new chitosan composite antibacterial and mite removal agent can remove mites.

[0078] For example, adding chloramine polymer and one or more solutions of wormwood extract, houttuynia cordata extract, phellodendron chinense extract, indigo naturalis extract and tonka bean extract, silver-containing compounds and zirconium phosphate compounds, polyurethane polymers can achieve a deodorizing effect.

[0079] For another example, adding mold removers, such as calcium phosphate and 2-pyridinethiol-1-zinc oxide, can have an anti-mold effect.

[0080] For another example, adding metal fibers, softeners and antistatic agents combined with polyurethane, polyacrylonitrile / phenyl acrylate copolymers, nano-ceramic absorbers and nano-conductive polymers can have an anti-radiation effect.

[0081] For another example, adding a polymer permanent antistatic agent can have an antistatic effect.

[0082] For example, by adding a film-forming aid, the electrostatically coated surface is given underwater superoleophobicity, and the oily stains on the electrostatically coated surface can be quickly removed by washing with water. The film itself has excellent optical transparency, biocompatibility and excellent wearing comfort.

[0083] Often one additive can perform multiple functions.

[0084] In this embodiment, the main material of the polymer solution is polyurethane, and a film-forming agent is added to the solution. A needle-type electrostatic coating device is selected, and the receiving end 200 of the roller is directly spun, and the fiber membrane is selected as cotton fiber; adding additives does not affect the setting of spinning parameters.

[0085] After the electrostatic coating process, the obtained second fiber membrane 310 can be washed with water to quickly remove the oily stains on the electrostatically coated surface, and the membrane itself has excellent optical transparency and biocompatibility. After twisting, drawing, weaving and other processes, the formed woven fabric has good comfort.

[0086] In the implementation process, by adjusting the distance between the electrostatic coating receiving end 200 and the needle, the thickness of the electrostatically spun membrane can be affected when the spinning high voltage remains unchanged. The thickness of the electrostatically spun membrane can also be affected by adjusting the spinning high voltage while the spinning distance remains unchanged.

[0087] At the same time, the properties of the additives themselves can further affect the color of the fiber membrane, and the use of colorants can be reduced if it meets production requirements.

[0088] Other polymer solutions are preferably polyurethane, polyvinylidene fluoride, polyvinyl butyral, and polyacrylonitrile.

[0089]

[0090]

[0091]

[0092]

[0093] It should be noted that the above-mentioned specific embodiments are exemplary, and those skilled in the art can come up with various solutions inspired by the disclosure of the present invention, and these solutions also belong to the disclosure scope of the present invention and fall within the protection scope of the present invention. Those skilled in the art should understand that the present invention specification and its drawings are illustrative and do not constitute a limitation of the claims. The scope of protection of the present invention is defined by the claims and their equivalents. The present invention specification contains multiple inventive concepts, such as "preferably", "according to a preferred embodiment" or "optionally", all of which indicate that the corresponding paragraph discloses an independent concept, and the applicant reserves the right to file a divisional application based on each inventive concept. Throughout the text, the features guided by "preferably" are only an optional method and should not be understood as being required. Therefore, the applicant reserves the right to abandon or delete the relevant preferred features at any time.

Claims

1. An electrospinning system based on enhanced electric field, comprising: The spray head (100) is used to spray the polymer solution onto the fiber membrane in an electrostatic coating manner. A receiving end (200) is provided with an adjustable potential difference between the receiving end (200) and the nozzle (100) so that the nozzle (100) can spray the fiber membrane carried on the receiving end (200) in an electrostatic coating manner. It is characterized in that The fiber membrane is maintained on the receiving end (200) at least partially by electrostatic adsorption formed by the potential difference. An electric field amplitude modulation component (110) is disposed on the periphery of the nozzle (100), wherein, due to the natural enhancement of the electric field strength by the electric field amplitude modulation component (110), without adding an additional electric field source, the electric field strength within the area affected by the electric field amplitude modulation component (110) is greater than the electric field strength outside the area affected by the electric field amplitude modulation component (110).

2. The system according to claim 1, characterized in that The electric field amplitude modulation component (110) is placed in the electric field formed between the nozzle (100) and the receiving end (200), wherein the electric field strength within the influence range of the electric field amplitude modulation component (110) is greater than the electric field strength outside the influence range of the electric field amplitude modulation component (110), so that the nozzle (100) can just use the electric field strength within the range of the electric field amplitude modulation component (110) to complete the expected electrostatic coating process, and at the same time can just use the objective law of the decrease of the electric field strength when away from the electric field amplitude modulation component (110) to achieve the simple separation of the fiber membrane from the receiving end (200).

3. A system according to any one of the preceding claims, characterized in that The nozzles (100) are arranged around a portion of the circumference of the receiving end (200) to form an electrostatic coating area at a corresponding position on the receiving end (200).

4. A system according to any one of the preceding claims, characterized in that The electric field amplitude modulation component (110) is a metal directional cover, which is sleeved on the outside of the nozzle (100), and the cross section of the metal directional cover is larger than the nozzle to form an electrostatic spinning action range.

5. A system according to any one of the preceding claims, characterized in that The electric field amplitude modulation component (110) is a metal wire, which is arranged on both sides of the nozzle (100), and the arrangement direction of the metal wire is non-parallel to the axial direction of the nozzle (100).

6. A system according to any one of the preceding claims, characterised in that The receiving end (200) is configured as a permeable structure and is further provided with an adjustment component (210). The adjustment component (210) is based on the area where the fiber membrane is located, so as to achieve the purpose of specifically adjusting the force applied to the fiber membrane at the corresponding position.

7. A system according to any one of the preceding claims, characterised in that In the area where the fiber membrane is easy to fall off from the receiving end (200), the fiber membrane can be attached to the receiving end (200) by increasing the adsorption force from the inside of the receiving end (200) to the inside of the receiving end (200) or increasing the blowing force from the outside of the receiving end (200) to the inside of the receiving end (200).

8. A system according to any one of the preceding claims, characterised in that When the fiber membrane needs to be detached from the receiving end (200), especially when taking over the next link area, the fiber membrane can be loosened from the surface of the receiving end (200) by reducing the adsorption force from the inside of the receiving end (200) to the inside of the receiving end (200) or reducing the blowing force from the outside of the receiving end (200) to the inside of the receiving end (200).

9. A system according to any one of the preceding claims, characterised in that The system also includes a fiber combing section (400) and a first conveying section (500), wherein the fiber combing section (400) processes the fiber raw material into a mesh-shaped first fiber membrane (300), and the first fiber membrane (300) is transmitted to the receiving end (200) of the electrostatic coating section through the first conveying section (500).

10. A system according to any one of the preceding claims, characterised in that The second fiber membrane (310) formed after the electrostatic coating treatment by the electrostatic coating section is mechanically processed by the processing section (600) into a shape of strips, strands, ropes, lines, piles, rolls, etc., and then enters the collecting section (700).

11. A system according to any one of the preceding claims, characterised in that The second fiber membrane (310) formed after the electrostatic coating treatment in the electrostatic coating section passes through the processing section (600), and the processing section (600) is a temperature control device. After entering the processing section (600), the second fiber membrane (310) is heated or cooled and then enters the collecting section (700).

12. A system according to any preceding claim, characterised in that The second fiber membrane (310) formed after the electrostatic coating treatment by the electrostatic coating section passes through the processing section (600), and the processing section (600) is a pressing device. The second fiber membrane (310) is processed by one or more of room temperature pressing, cooling pressing, hot pressing, ultrasonic pressing, gluing, and compounding, and then enters the collecting section (700).

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