Device and method for preparing a high-orientation and uniform distribution of a mixture of ionized substances

Abstract

This invention relates to an apparatus and method for preparing blended yarn with a highly oriented and uniformly distributed ionized material array. The apparatus includes a fiber web conveying device, an array ionization device, a variable current coil assembly, a ring-shaped auxiliary electrode, and a constant current coil assembly. The fiber web conveying device includes several conveying rollers and a conveying screen, with the conveying screen surrounding the rollers to form a hollow cavity. The array ionization device is located below the fiber web conveying device. The variable current coil assembly is located below the array ionization device and includes a first cylindrical iron core and a first coil. The ring-shaped auxiliary electrode is located between the microfiber web and the array ionization device. The constant current coil assembly is located within the hollow cavity and includes a second cylindrical iron core and a second coil. This invention can effectively control the movement path of the ionized material array, avoiding disordered movement and mutual interference of the ionized material array, enabling it to be highly oriented and uniformly embedded in the microfiber web.

Description

Technical Field

[0001] This invention belongs to the field of spinning and processing technology, and in particular relates to a device and method for preparing blended yarn with a highly oriented and uniformly distributed array of ionized substances. Background Technology

[0002] With the continuous development of the national economy and the improvement of people's living standards, functional textiles and nanotextiles have gradually entered the public eye and attracted widespread attention and favor from consumers and technology developers. Materials such as nanofibers and nanosprays can be functionalized by adding functional substances during the preparation process. Combined with their small size effect, the resulting products also have great development potential in energy, biomedicine, and smart wearables. However, the nanoscale size significantly weakens the mechanical properties and efficient integration of nanomaterials, limiting their potential as a single component for functional applications.

[0003] To improve the overall performance of products, based on the preparation of functional nanomaterials, these nanomaterials can be further processed into blended yarns using other micron-sized fibers as carriers. This improves their mechanical properties and allows them to function as functional substances within the blended yarns. Nanofibers and nanosprays are typically prepared using electrospinning and electrospraying technologies. For ease of description, the nanofibers and nanosprays produced by electrospinning and electrospraying technologies can be defined as ionized material arrays.

[0004] Taking the electrospinning of nanofibers as an example, Chinese patent CN201910566867.6 discloses an online micro / nanofiber multi-level core-spun composite spinning device and method. This patent realizes the cross-scale online composite yarn of submicron and micron fibers by setting an electrospinning device on a spinning machine. The submicron fibers are first deposited and twisted on the surface of chemical fiber filaments to form submicron fiber / filament core-spun yarn, and then covered by micron short fibers in the core layer of the yarn body, finally preparing a submicron fiber / filament / short fiber multi-level core-spun composite yarn. However, the micron short fibers on the surface will easily fall off during the yarn weaving process due to low bonding strength. Although Chinese patent CN201810011253.7 extends the working length of the carding web and adds an electrospinning device above the web to allow electrospun nanofibers to be directly deposited into the micron-sized fiber web, and then the blended web is bundled into slivers to prepare cross-scale blended yarn, optimizing the spatial distribution of fibers in the yarn under the stretching effect during the spinning process, the nanofiber jets exhibit irregular movement during deposition, and different jets interfere with each other. On the one hand, this affects the normal morphology of the fibers, and on the other hand, most of the nanofibers obtained after solidification will be disorderly piled on the surface of the carding web. After the resulting blended slivers undergo doubling and stretching, the nanofibers will agglomerate or break due to inconsistent orientation, greatly increasing the possibility of them falling off, thus affecting the functional stability and durability of the product. To overcome the disordered motion of the jet during electrospinning and achieve highly oriented nanofibers, Chinese patent CN201710601626.1 uses a perforated roller as a receiving device, causing the obtained nanofibers to aggregate and align along the direction of the perforations under the combined effects of the roller's high-speed rotation and negative pressure airflow. Chinese patent CN202010747607.1 uses concentric ring-shaped metal electrodes as a receiving device to electrospin oriented nanofiber membranes. However, these methods of modifying the receiving device still suffer from disordered jet motion and mutual interference, ultimately affecting the degree of orientation. Although Chinese patent CN201910570733.1 achieves jet on / off control and deposition control by controlling the movement of a connecting rod, the control effect on the disordered motion of the jet during its movement remains limited.

[0005] Furthermore, the inventors of this application previously applied for Chinese Patent CN202410886418.0, "A Device and Method for Promoting Deep Embedding of Nanofibers." This method, through a combination of a fiber web fluffiness control device and a non-metallic transport mesh curtain, regulates the electric field distribution without affecting normal spinning production. This further alters the pore distribution within the constructed fiber web and the embedding channels for electrospun nanofibers, achieving deep embedding of electrospun nanofibers in the thickness direction of the fiber web. Simultaneously, as the fiber web continues to be transported away from the spinning area, the polarization of the fiber web weakens, the porosity between fibers decreases, and the second ion fan... The generated ion wind neutralizes the residual charge within the fiber web that cannot dissipate through the non-metallic mesh, thus weakening the mutual repulsion effect between fibers. This further increases the effective contact area between fibers and enhances the bonding strength between fibers across scales, ultimately achieving a significant improvement in the uniformity of distribution and bonding strength of electrospun nanofibers in the blended yarn. However, this patent still suffers from disordered movement and mutual interference during nanofiber movement, resulting in nanofibers not being able to be uniformly and highly oriented embedded in the fiber web. Consequently, there is a situation where nanofibers are randomly deposited on the surface of the fiber web, which requires further improvement.

[0006] Therefore, based on the preparation process of cross-scale fiber blended yarn, it is necessary to develop a device with controllable movement path of ionized material array to meet the production application requirements of highly oriented and uniformly embedded micron fiber web without mutual interference of ionized material array. Summary of the Invention

[0007] The main objective of this invention is to propose a device and method for preparing blended yarn with a highly oriented and uniformly distributed ionized material array, which can effectively solve the technical problem that the disordered movement and mutual interference of the ionized material array prevents it from being uniformly embedded into the micron fiber network with a high orientation.

[0008] To achieve the above objectives, the present invention provides the following technical solution:

[0009] A blended yarn preparation apparatus with a highly oriented and uniformly distributed ionized material array includes:

[0010] A fiber web conveying device includes several conveying rollers and a conveying screen. The conveying screen surrounds the several conveying rollers to form a hollow cavity and its lower surface is parallel to the horizontal plane. A negative pressure suction device is provided in the hollow cavity. The negative pressure suction device attaches the combed micron fiber web to the lower surface of the conveying screen through negative pressure suction and makes it conveyed with the movement of the conveying screen.

[0011] An array ionization device, located below the fiber web transport device, is used to generate an array of ionized materials moving toward the micron-sized fiber web;

[0012] A variable current coil assembly, located below the array ionization device, includes a first cylindrical iron core and a first coil. The first cylindrical iron core is vertically arranged, and the first coil is wound around the side of the first cylindrical iron core in a right-hand spiral upward direction. A variable current flows through the first coil.

[0013] An annular auxiliary electrode is located between the microfiber mesh and the array ionization device, with the annular plane parallel to the microfiber mesh, and the annular auxiliary electrode has a potential.

[0014] A constant current coil assembly is located in the hollow cavity. It includes a second cylindrical iron core and a second coil. The second cylindrical iron core is vertically arranged, and the second coil is wound around the side of the second cylindrical iron core in a right-hand spiral upward direction. A constant current flows through the second coil.

[0015] Preferably, there are four conveying rollers, and the conveying mesh curtain surrounds the four conveying rollers to form a trapezoidal hollow cavity, and the upper and lower surfaces of the conveying mesh curtain are parallel to the horizontal plane.

[0016] The conveyor screen is made of polytetrafluoroethylene. The mesh of the screen is a circle with a diameter of 1-3mm and the center distance between the circles is 2-5mm. The transmission speed of the conveyor screen is 15~20m / min.

[0017] Preferably, the array ionization device includes:

[0018] A solution container with grooves on its upper surface for holding the solution;

[0019] A spherical nozzle is rotatably mounted on the groove.

[0020] A rotary drive device is connected to the spherical nozzle via a connecting rod, used to drive the spherical nozzle to rotate;

[0021] The first high-voltage generator is electrically connected to the spherical nozzle.

[0022] The distance between the array ionization device and the conveyor screen is 15~25cm. The output voltage of the first high voltage generator is a positive voltage of 35~55kV. In the array ionization space, an electric field array is generated with the main direction of the electric field lines pointing towards the conveyor screen. The ionized material array with the applied positive voltage is positively charged and its initial velocity direction is upward.

[0023] The solution container is cylindrical with an outer height of 8-12cm. The upper surface of the solution container is hollowed out to form a groove with an outer diameter of 10-16cm, an inner diameter of 9-15cm, and a hollowing depth of 5-9cm. The diameter of the spherical nozzle 52 is 6-12cm, and the rotation speed is 20-45r / min. The connecting rod is made of polytetrafluoroethylene.

[0024] Preferably, the first cylindrical iron core has a cross-sectional diameter of 8-16cm and a height of 15-25cm. Its upper surface is parallel to the microfiber mesh and is 3-8cm away from the bottom surface of the array ionization device. The first coil's enameled wire is made of copper, has a cross-sectional diameter of 1-8mm, and a winding density of 15-25 turns / 5cm. Its axis extends through the center of the spherical nozzle. The first coil is connected to a DC power supply.

[0025] Preferably, the annular auxiliary electrode is 5-10 cm away from the micron fiber mesh. The annular auxiliary electrode is made of an aluminum annular metal wire with a cross-sectional diameter of 2-8 mm and an annular diameter of 20-30 cm. The annular auxiliary electrode is connected to a DC power supply to generate a potential, and the potential of the annular auxiliary electrode is set to 5-10 kV.

[0026] Preferably, the second cylindrical iron core has a cross-sectional diameter of 40-55cm, a height of 10-20cm, a lower surface parallel to the microfiber mesh, and a distance of 3-8cm from the upper surface of the conveyor screen. The second coil's enameled wire is made of copper, has a cross-sectional diameter of 1-8mm, and a winding density of 15-25 turns / 5cm. The second coil is connected to a DC power supply.

[0027] Preferably, the device also includes:

[0028] Two conveyor belts are arranged on both sides of the conveyor screen to transport microfiber webs together with the conveyor screen.

[0029] Preferably, the device further includes a high-voltage blade electrode assembly, which comprises:

[0030] Two blade electrodes are positioned in front of the conveyor screen and are arranged on both sides of the microfiber mesh.

[0031] The second high-voltage generator is connected to the two blade electrodes.

[0032] The second high-voltage generator outputs a negative voltage, ranging from 30 to 80 kV.

[0033] Preferably, the blade electrode is a copper triangular prism with a distance of 3-8 cm between prisms. The generatrix of the prism is perpendicular to the transmission direction of the microfiber network and parallel to the horizontal plane. The cross-section is an isosceles triangle with a vertex angle of 10°-20°.

[0034] Preferably, the device also includes:

[0035] An ion blower, located downstream of the microfiber web in the transmission direction and below the plane of the microfiber web, is used to spray ion wind onto the blended fiber web.

[0036] The power of the ion fan is 250~350V / s.

[0037] Preferably, the direction of the ion fan outlet is inclined to the transmission direction of the microfiber mesh.

[0038] Preferably, the direction of the ion fan outlet is inclined in the opposite direction to the transmission direction of the microfiber mesh, and the angle of attack between the two is 30°-50°.

[0039] A method for preparing blended yarn with a highly oriented and uniformly distributed ionized material array, using the aforementioned apparatus for preparing blended yarn with a highly oriented and uniformly distributed ionized material array, includes the following steps:

[0040] Step 1: Dissolve the polymer in an organic solvent and stir to obtain a mixed solution, wherein the concentration of the polymer in the mixed solution is 5wt%-14wt%;

[0041] Step 2: The fibers are opened and combed to obtain a micron fiber web. The micron fiber web is charged and fluffy under the corona discharge of the high-voltage blade electrode group, and then directionally transported through the conveyor screen under the negative pressure suction of the negative pressure suction device.

[0042] Step 3: Start the variable current coil assembly, the ring auxiliary electrode and the constant current coil assembly. In the variable current coil assembly, the current in the first coil flows upward, the initial current value is 0A, and it increases at a rate of 0.1-0.5A / s. When the current increases to 10A, it decreases to 0A at a rate of 10A / s. This cycle repeats, thereby generating a counterclockwise induced ring electric field. In the constant current coil assembly, the current in the second coil flows upward, and the current magnitude is maintained at 5-10A.

[0043] Step 4: Add the mixed solution from Step 1 to the solution container of the array ionization device. When the rotary drive device drives the spherical nozzle to rotate, the spherical nozzle continuously picks up new solution from the solution container. Under the high pressure of the high voltage generator, the surface of the spherical nozzle continuously generates an array of ionized materials, which moves toward the microfiber mesh. The induced annular electric field generated by the variable current coil assembly induces the ionized material array to move upward along the right-hand spiral. When the ionized material array continues to move toward the microfiber mesh, the electric field generated by the annular auxiliary electrode constrains the movement amplitude of the ionized material array. When the ionized material array gets closer to the microfiber mesh, the approximately horizontal centripetal magnetic field formed by the constant current coil assembly on the plane of the microfiber mesh causes the ionized material array to be deflected by the Lorentz force in this magnetic field. The horizontal component of its velocity decreases while the vertical component increases, allowing it to be deeply embedded in the microfiber mesh.

[0044] Step 5: The resulting blended fiber web continues to be transported along the conveyor screen. The ion blower sprays ion wind at an inclined angle onto the blended fiber web. The ion wind neutralizes the residual charge in the micron fiber web that cannot be dissipated through the non-metallic conveyor screen, causing the gaps between fibers to shrink, which facilitates the smooth bundling of the blended fiber web into strips. The inclined blowing process can achieve horizontal relative displacement of the bottom layer fibers, causing the ionized material array to collapse, which is conducive to the high orientation arrangement of the ionized material array after the blended fiber web is subsequently bundled into strips. At the same time, it also increases the bonding area and bonding strength between nanofibers and microfibers. Finally, after the blended fiber web is bundled into strips, it is pressed by the pressing roller and wound up, and then processed by the subsequent spinning process to achieve the preparation of blended yarn.

[0045] Preferably, in step 1, the polymer is polyacrylonitrile, polylactic acid, polyurethane or polyamide, and the organic solvent is DMF or a DMF / acetone mixture.

[0046] Preferably, the fiber in step 2 is cotton, short wool, short silk, or short chemical fiber.

[0047] Preferably, the subsequent spinning process in step 5 includes drawing, pre-combing preparation, combing, roving, and spinning.

[0048] This invention provides an apparatus and method for preparing blended yarn with a highly oriented and uniformly distributed array of ionized materials, which has the following beneficial effects.

[0049] 1. The present invention uses a variable current coil assembly to generate an induced circumferential electric field in the initial motion space of the ionized material array. After being generated in the array ionization device, the ionized material array itself has an initial upward motion velocity. Under the induction of the induced circumferential electric field, the initial motion velocity is deflected along the direction of the induced circumferential electric field, ultimately making its initial motion direction an upward motion along a right-hand spiral, thereby reducing mutual interference between the ionized material arrays. The electric field generated by the ring auxiliary electrode constrains the motion amplitude of the ionized material array. The constant current coil assembly will form an approximately horizontal centripetal magnetic field in the plane where the microfiber network is located. The ionized material array will undergo orientation deflection due to the Lorentz force in this magnetic field, and its horizontal component of velocity will decrease while its vertical component will increase, allowing it to be deeply embedded in the microfiber network. Through the design of the variable current coil assembly, the ring auxiliary electrode, and the constant current coil assembly, the present invention can effectively control the motion path of the ionized material array, avoid disordered motion and mutual interference of the ionized material array, and enable it to be highly oriented and uniformly embedded in the microfiber network.

[0050] 2. When the rotary drive unit drives the spherical nozzle to rotate, the nozzle continuously picks up new solution from the solution container. Under the high pressure of the high-pressure generator, an array of ionized substances is continuously generated on the surface of the nozzle and moves towards the micron-fiber web. This device effectively avoids nozzle clogging by generating an array of ionized substances through the spherical nozzle, ensuring continuous production without stopping the machine, greatly improving production efficiency. Furthermore, this device has a small footprint and offers good production benefits.

[0051] 3. Under high voltage, the two blade electrodes undergo corona discharge, causing the fibers in the microfiber mesh to repel each other due to negative charge, thereby increasing the gap between fibers and providing physical space for the deep embedding of the ionized material array.

[0052] 4. The ion blower is used to spray ion wind onto the blended fiber web. The ion wind can neutralize the residual charge in the micron fiber web that cannot be dissipated through the non-metallic conveying screen, and the gaps between the fibers shrink, which facilitates the smooth bundling of the blended fiber web into strips. The direction of the ion blower nozzle is inclined to the transport direction of the micron fiber web. The blowing process at the inclined angle can realize the horizontal relative displacement of the bottom fiber, so that the ionized material array falls in the opposite direction of the fiber web transport direction, which is conducive to the high orientation arrangement of the ionized material array after the blended fiber web is subsequently bundled into strips. At the same time, it also increases the bonding area and bonding strength between nanofibers and microfibers. Attached Figure Description

[0053] Figure 1 A schematic diagram of the device for preparing blended yarn with a highly oriented and uniformly distributed array of ionized materials.

[0054] Figure 2 This is a schematic diagram of the structure and working principle of a variable current coil assembly.

[0055] Figure 3 This is a schematic diagram of the structure and working principle of a constant current coil assembly.

[0056] Figure 4 This is a schematic diagram of the centripetal magnetic field distribution of a constant current coil and the forces acting on the ionized material array.

[0057] Figure 5 An electron microscope image showing the uniform distribution of ionized substances within the blended yarn.

[0058] In the diagram: 1. Conveyor roller; 2. Conveyor screen; 3. Negative pressure suction device; 4. Micron fiber mesh; 5. Array ionization device; 51. Solution container; 52. Spherical nozzle; 53. Rotary drive device; 54. First high-voltage generator; 6. Variable current coil assembly; 61. First cylindrical iron core; 62. First coil; 7. Annular auxiliary electrode; 8. Constant current coil assembly; 81. Second cylindrical iron core; 82. Second coil; 9. Two conveyor belts; 10. Blade electrode; 11. Second high-voltage generator; 12. Ionizing fan. Detailed Implementation

[0059] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0060] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0061] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified. Furthermore, the terms "installed," "connected," and "linked" should be interpreted broadly; for example, they may refer to a fixed connection, a detachable connection, or an integral connection; they may refer to a mechanical connection or an electrical connection; they may refer to a direct connection or an indirect connection through an intermediate medium; and they may refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0062] Reference Figure 1-4 A device for preparing blended yarn with a highly oriented and uniformly distributed array of ionized substances, comprising:

[0063] A fiber web conveying device includes several conveying rollers 1 and a conveying screen 2. The conveying screen 2 forms a hollow cavity around the several conveying rollers 1 and its lower surface is parallel to the horizontal plane. A negative pressure suction device 3 is provided in the hollow cavity. The negative pressure suction device 3 attaches the combed micron fiber web 4 to the lower surface of the conveying screen 2 through negative pressure suction and makes it conveyed with the movement of the conveying screen 2.

[0064] An array ionization device 5, located below the fiber web transmission device, is used to generate an array of ionized materials moving toward the micron fiber web 4;

[0065] The variable current coil assembly 6 is located below the array ionization device 5. It includes a first cylindrical iron core 61 and a first coil 62. The first cylindrical iron core 61 is vertically arranged, and the first coil 62 is wound around the side of the first cylindrical iron core 61 in a right-hand spiral upward direction. A variable current flows through the first coil 62.

[0066] An annular auxiliary electrode 7 is located between the microfiber mesh 4 and the array ionization device 5, with the annular plane parallel to the microfiber mesh 4, and the annular auxiliary electrode 7 has a potential.

[0067] The constant current coil assembly 8 is located in the hollow cavity and includes a second cylindrical iron core 81 and a second coil 82. The second cylindrical iron core 81 is vertically arranged, and the second coil 82 is wound around the side of the second cylindrical iron core 81 in a right-hand spiral upward direction. A constant current flows through the second coil 82.

[0068] The working principle of this device is as follows:

[0069] Several conveyor rollers 1 drive the conveyor screen 2 to move. The negative pressure suction device 3 uses negative pressure suction to attach the combed micron fiber web 4 to the lower surface of the conveyor screen 2 and make it move with the conveyor screen 2.

[0070] The array ionization device 5 generates an array of ionized matter moving toward the micron fiber web 4. Since the variable current coil assembly 6 is located below the array ionization device 5, a changing current flows through the first coil 62. According to Ampere's circuital law, the variable current coil assembly 6 will generate a changing magnetic field. According to Faraday's law of electromagnetic induction, the change in magnetic flux caused by the changing magnetic field will induce a circumferential electric field in the initial motion space of the ionized matter array. After being generated in the array ionization device 5, the ionized matter array itself has an initial upward motion velocity. Under the induction of the induced circumferential electric field, the initial motion velocity is deflected along the direction of the induced circumferential electric field, and finally its initial motion direction is upward along a right-hand spiral, thereby reducing the mutual interference between the ionized matter arrays.

[0071] As the ionized material array continues to move toward the microfiber mesh 4, due to the potential on the annular auxiliary electrode 7, the electric field lines in the space inside the ring have a component pointing toward the center of the ring. When the ionized material array comes to this space, it will be affected by the electric field distribution, which will reduce its velocity component in the horizontal plane. That is, the range of motion in the horizontal plane is restricted. The electric field generated by the annular auxiliary electrode 7 constrains the range of motion of the ionized material array.

[0072] As the ionized material array approaches the microfiber mesh 4 further, a constant current flows through the second coil 82. This constant current coil assembly 8 then forms an approximately horizontal centripetal magnetic field in the plane of the microfiber mesh 4. The ionized material array, subjected to the Lorentz force in this magnetic field, undergoes orientation deflection, with its horizontal velocity component decreasing and its vertical component increasing, allowing it to embed deeply into the microfiber mesh 4. Specifically, refer to… Figure 4 If the ionized material array at a certain location is decomposed into velocity (Vt, Vr, and V⊥), under the influence of the horizontal centripetal magnetic field, Lorentz forces (Ft and F⊥) perpendicular to the velocity will be generated. F⊥ will suppress the motion in the opposite direction of Vt, while Ft will enhance the motion in the same direction as V⊥. That is, the horizontal component of the velocity decreases while the vertical component increases.

[0073] Therefore, through the design of the variable current coil assembly 6, the ring auxiliary electrode 7 and the constant current coil assembly 8, the present invention can effectively control the movement path of the ionized material array, avoid disordered movement and mutual interference of the ionized material array, and enable it to be highly oriented and uniformly embedded in the micron fiber network.

[0074] In a preferred embodiment, there are four conveyor rollers 1, and the conveyor mesh curtain 2 surrounds the four conveyor rollers 1 to form a trapezoidal hollow cavity, and the upper and lower surfaces of the conveyor mesh curtain 2 are parallel to the horizontal plane.

[0075] The conveyor curtain 2 is made of polytetrafluoroethylene. The mesh of the curtain is a circle with a diameter of 1mm and the center distance between the circles is 2mm. The transmission speed of the conveyor curtain 2 is 15m / min.

[0076] The negative pressure suction device draws gas from the chamber through the flared air inlet and generates negative pressure by rotating blades, driving the airflow, and finally discharges the airflow through the duct.

[0077] As a preferred embodiment, the array ionization device 5 includes:

[0078] Solution container 51 has a groove on its upper surface for holding solution;

[0079] The spherical nozzle 52 is rotatably mounted on the groove;

[0080] A rotary drive device 53 is connected to the spherical nozzle 52 via a connecting rod and is used to drive the spherical nozzle 52 to rotate.

[0081] The first high-voltage generator 54 is electrically connected to the spherical nozzle 52.

[0082] When the rotary drive device 53 drives the spherical nozzle 52 to rotate, the spherical nozzle 52 continuously picks up new solution from the solution container 51. Under the high pressure of the high pressure generator, the surface of the spherical nozzle 52 continuously generates an array of ionized substances and moves toward the micron fiber mesh 4.

[0083] This device generates an array of ionized substances through a spherical nozzle 52, effectively avoiding the problem of nozzle clogging. It can ensure continuous production without stopping the machine, greatly improving production efficiency. At the same time, the device has a small footprint and good production benefits.

[0084] Specifically, the distance between the array ionization device 5 and the conveyor screen 2 is 20cm. The output voltage of the first high voltage generator 54 is a positive voltage of 45kV. In the array ionization space, the electric field lines are generated with the main direction pointing to the electric field array distribution of the conveyor screen 2. The ionized material array with the applied positive voltage is positively charged and its initial velocity direction is upward.

[0085] In this embodiment, the solution container 51 is a cylinder with an outer height of 10cm. The upper surface of the solution container 51 is hollowed out to form a groove with an outer diameter of 10cm, an inner diameter of 9cm, and a hollowing depth of 6cm. The spherical nozzle 52 has a diameter of 8cm and a rotation speed of 30r / min. The connecting rod is made of polytetrafluoroethylene.

[0086] In this embodiment, the first cylindrical iron core 61 has a cross-sectional diameter of 10cm and a height of 15cm. Its upper surface is parallel to the microfiber mesh 4 and is 5cm away from the bottom surface of the array ionization device 5. The first coil 62 has copper enameled wire with a cross-sectional diameter of 3mm and a winding density of 15 turns / 5cm. Its axis extends through the center of the spherical nozzle 52. The first coil 62 is connected to a DC power supply.

[0087] The annular auxiliary electrode 7 is 5 cm away from the micron fiber mesh. The annular auxiliary electrode 7 is made of an aluminum annular metal wire with a cross-sectional diameter of 3 mm and a ring diameter of 20 cm. The annular auxiliary electrode 7 is connected to a DC power supply to generate a potential. The potential of the annular auxiliary electrode 7 is set to 5 kV.

[0088] The second cylindrical iron core 81 has a cross-sectional diameter of 40 cm and a height of 10 cm. Its lower surface is parallel to the microfiber mesh 4 and is 5 cm away from the upper surface of the conveyor screen 2. The second coil 82 has copper enameled wire with a cross-sectional diameter of 3 mm and a winding density of 20 turns / 5 cm. The second coil 82 is connected to a DC power supply. Preferably, the first coil 62, the annular auxiliary electrode 7, and the second coil 82 are all connected to independent DC power supplies.

[0089] As a preferred embodiment, the device further includes:

[0090] Two conveyor belts 9 are arranged on both sides of the conveyor curtain 2 to jointly transport the micron fiber mesh 4 with the conveyor curtain 2, ensuring the stable transmission of the micron fiber mesh 4.

[0091] In a preferred embodiment, the device further includes a high-voltage blade electrode assembly, which comprises:

[0092] Two blade electrodes 10 are disposed in front of the conveyor screen 2 and are arranged on both sides of the microfiber mesh 4;

[0093] The second high-voltage generator 11 is connected to the two blade electrodes 10.

[0094] The second high-voltage generator 11 outputs a negative voltage of 50KV. Under the action of the high voltage, the two blade electrodes 10 corona discharge, causing the fibers in the micron fiber mesh 4 to repel each other due to being negatively charged, thereby increasing the gap between fibers and providing physical space for the deep embedding of the ionized material array.

[0095] In this embodiment, both blade electrodes 10 are equipped with independent voltage adjustment modules, which can construct a spatial electric field intensity distribution array. That is, by adjusting the external voltage of the two blade electrodes respectively, the potential difference between the electrodes is changed, thereby affecting the electric field distribution in space.

[0096] As a preferred embodiment, the blade electrode 10 is a copper triangular prism with a distance of 5 cm between the prisms. Of course, the distance between the prisms can be any one of the range of 3-8 cm. The generatrix of the prism is perpendicular to the transmission direction of the microfiber mesh 4 and parallel to the horizontal plane. The cross-section is an isosceles triangle with a vertex angle of 10°. Of course, the vertex angle can be any one of the range of 10°-20°.

[0097] As a preferred embodiment, the device further includes:

[0098] Ionizing blower 12 is located downstream of the micron fiber web 4 in the transmission direction and below the plane of the micron fiber web 4. It is used to spray ionizing air onto the blended fiber web. The ionizing air can neutralize the residual charge in the micron fiber web 4 that cannot be dissipated through the non-metallic conveying screen 2, and the gaps between fibers will shrink, which will facilitate the smooth winding of the blended fiber web into strips.

[0099] In this embodiment, the ion fan 12 has a power of 350V / s.

[0100] In a preferred embodiment, the direction of the air outlet of the ion fan 12 is inclined to the transmission direction of the microfiber mesh 4.

[0101] In this embodiment, the direction of the air outlet of the ion fan 12 is tilted in the opposite direction to the transmission direction of the micron fiber web 4, and the angle of attack between the two is 30°. Of course, the angle of attack between the two can be arbitrarily chosen within the range of 30°-50°. The angle of attack is defined as the acute angle between the opposite direction of the air blowing direction and the transmission direction of the fiber web.

[0102] Based on the highly oriented and uniformly embedded microfiber web of ionized material array, the inclined blowing process can realize the horizontal relative displacement of the bottom fiber, causing the ionized material array to fall in the opposite direction of the fiber web transport direction, which facilitates the highly oriented arrangement of the ionized material array after the blended fiber web is subsequently bundled into strips, and also increases the bonding area and bonding strength between nanofibers and microfibers.

[0103] The following section will provide further explanation based on specific applications.

[0104] A method for preparing blended yarn with a highly oriented and uniformly distributed ionized material array, using the aforementioned apparatus for preparing blended yarn with a highly oriented and uniformly distributed ionized material array, includes the following steps:

[0105] Step 1: Dissolve polyacrylonitrile in DMF and stir to obtain a mixed solution. The concentration of polyacrylonitrile in the mixed solution is 8 wt%. Of course, the concentration of polyacrylonitrile can be arbitrarily selected within the range of 5 wt% to 14 wt%.

[0106] Step 2: The cotton fibers are opened and combed to obtain a micron fiber web 4. The micron fiber web 4 is charged and fluffy under the corona discharge of the high-voltage blade electrode 10 group, and then directionally transported through the conveyor curtain 2 under the negative pressure suction of the negative pressure suction device 3.

[0107] Step 3: Start the variable current coil assembly 6, the ring auxiliary electrode 7 and the constant current coil assembly 8. In the variable current coil assembly 6, the current in the first coil 62 flows upward, the initial current value is 0A, and it increases at a rate of 0.1A / s. Of course, the rate can be any one in the range of 0.1-0.5A / s. When the current increases to 10A, it decreases to 0A at 10A / s. This cycle repeats, thereby generating a counterclockwise induced ring electric field. In the constant current coil assembly 8, the current in the second coil 82 flows upward, and the current value is maintained at 5A.

[0108] Step 4: Add the mixed solution from Step 1 to the solution container 51 of the array ionization device 5. When the rotary drive device 53 drives the spherical nozzle 52 to rotate, the spherical nozzle 52 continuously picks up new solution from the solution container 51. Under the high pressure of the high voltage generator, the surface of the spherical nozzle 52 continuously generates an array of ionized substances, which moves toward the microfiber mesh 4. The induced annular electric field generated by the variable current coil assembly 6 induces the ionized substance array to move upward along the right-hand spiral. When the ionized substance array continues to move toward the microfiber mesh 4, the constraining electric field generated by the annular auxiliary electrode 7 constrains the movement amplitude of the ionized substance array. When the ionized substance array gets closer to the microfiber mesh 4, the approximately horizontal centripetal magnetic field formed by the constant current coil assembly 8 on the plane where the microfiber mesh 4 is located causes the ionized substance array to be deflected by the Lorentz force in this magnetic field. The horizontal component of its velocity decreases while the vertical component increases, allowing it to be deeply embedded in the microfiber mesh 4.

[0109] Step 5: The resulting blended fiber web continues to be transported along the conveyor curtain. The ion blower 12 sprays ion wind at an inclined angle onto the blended fiber web. The ion wind neutralizes the residual charge in the micron fiber web 4 that cannot be dissipated through the non-metallic conveyor curtain 2, causing the gaps between fibers to shrink, which facilitates the smooth bundling of the blended fiber web into strips. The inclined blowing process can achieve the horizontal relative displacement of the bottom layer fibers, causing the ionized material array to collapse, which is conducive to the high orientation arrangement of the ionized material array after the blended fiber web is subsequently bundled into strips. At the same time, it also increases the bonding area and bonding strength between nanofibers and microfibers. Finally, after the blended fiber web is bundled into strips, it is pressed by the pressing roller and wound up, and then the blended yarn is prepared through the subsequent spinning process.

[0110] This embodiment was carried out at an ambient humidity of 50% and an ambient temperature of 23°C.

[0111] The resulting ionized material array (in this case, nanofibers) / cotton fiber blended yarn was observed under an electron microscope, and the results are as follows: Figure 5 As shown, the nanofibers are highly oriented and uniformly distributed in the blended yarn.

[0112] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A device for preparing blended yarn with a highly oriented and uniformly distributed array of ionized substances, characterized in that, include: A fiber web conveying device includes several conveying rollers and a conveying screen. The conveying screen surrounds the several conveying rollers to form a hollow cavity and its lower surface is parallel to the horizontal plane. A negative pressure suction device is provided in the hollow cavity. The negative pressure suction device attaches the combed micron fiber web to the lower surface of the conveying screen through negative pressure suction and makes it conveyed with the movement of the conveying screen. An array ionization device, located below the fiber web transport device, is used to generate an array of ionized materials moving toward the micron-sized fiber web; A variable current coil assembly, located below the array ionization device, includes a first cylindrical iron core and a first coil. The first cylindrical iron core is vertically arranged, and the first coil is wound around the side of the first cylindrical iron core in a right-hand spiral upward direction. A variable current flows through the first coil. An annular auxiliary electrode is located between the microfiber mesh and the array ionization device, with the annular plane parallel to the microfiber mesh, and the annular auxiliary electrode has a potential. A constant current coil assembly is located in the hollow cavity. It includes a second cylindrical iron core and a second coil. The second cylindrical iron core is vertically arranged, and the second coil is wound around the side of the second cylindrical iron core in a right-hand spiral upward direction. A constant current flows through the second coil.

2. The apparatus for preparing blended yarn with highly oriented and uniformly distributed ionized material array according to claim 1, characterized in that: The conveyor rollers consist of four rollers, and the conveyor mesh curtain surrounds the four rollers to form a trapezoidal hollow cavity. The upper and lower surfaces of the conveyor mesh curtain are parallel to the horizontal plane.

3. The apparatus for preparing blended yarn with a highly oriented and uniformly distributed ionized material array according to claim 1, characterized in that, The array ionization device includes: A solution container with grooves on its upper surface for holding the solution; A spherical nozzle is rotatably mounted on the groove. A rotary drive device is connected to the spherical nozzle via a connecting rod, used to drive the spherical nozzle to rotate; The first high-voltage generator is electrically connected to the spherical nozzle.

4. The apparatus for preparing blended yarn with a highly oriented and uniformly distributed ionized material array according to claim 1, characterized in that, This device also includes: Two conveyor belts are arranged on both sides of the conveyor screen to transport microfiber webs together with the conveyor screen.

5. The apparatus for preparing blended yarn with a highly oriented and uniformly distributed ionized material array according to claim 1, characterized in that, This device also includes a high-voltage blade electrode assembly, which comprises: Two blade electrodes are positioned in front of the conveyor screen and are arranged on both sides of the microfiber mesh. The second high-voltage generator is connected to the two blade electrodes.

6. The apparatus for preparing blended yarn with highly oriented and uniformly distributed ionized material array according to claim 5, characterized in that: The blade electrode is a copper triangular prism with a distance of 3-8 cm between prisms. The generatrix of the prism is perpendicular to the transmission direction of the microfiber network and parallel to the horizontal plane. The cross-section is an isosceles triangle with a vertex angle of 10°-20°.

7. The apparatus for preparing blended yarn with a highly oriented and uniformly distributed ionized material array according to claim 1, characterized in that, This device also includes: An ion blower, located downstream of the microfiber web in the transmission direction and below the plane of the microfiber web, is used to spray ion wind onto the blended fiber web.

8. The apparatus for preparing blended yarn with highly oriented and uniformly distributed ionized material array according to claim 7, characterized in that: The direction of the ion fan outlet is inclined to the transmission direction of the microfiber mesh.

9. The apparatus for preparing blended yarn with highly oriented and uniformly distributed ionized material array according to claim 8, characterized in that: The direction of the ion fan outlet is tilted in the opposite direction to the transmission direction of the microfiber mesh, with an angle of attack of 30°-50°.

10. A method for preparing blended yarn with a highly oriented and uniformly distributed ionized material array, comprising the apparatus for preparing blended yarn with a highly oriented and uniformly distributed ionized material array as described in any one of claims 1-9, characterized in that, Includes the following steps: Step 1: Dissolve the polymer in an organic solvent and stir to obtain a mixed solution, wherein the concentration of the polymer in the mixed solution is 5wt%-14wt%; Step 2: The fibers are opened and combed to obtain a micron fiber web. The micron fiber web is charged and fluffy under the corona discharge of the high-voltage blade electrode group, and then directionally transported through the conveyor screen under the negative pressure suction of the negative pressure suction device. Step 3: Start the variable current coil assembly, the ring auxiliary electrode and the constant current coil assembly. In the variable current coil assembly, the current in the first coil flows upward, the initial current value is 0A, and it increases at a rate of 0.1-0.5A / s. When the current increases to 10A, it decreases to 0A at a rate of 10A / s. This cycle repeats, thereby generating a counterclockwise induced ring electric field. In the constant current coil assembly, the current in the second coil flows upward, and the current magnitude is maintained at 5-10A. Step 4: Add the mixed solution from Step 1 to the solution container of the array ionization device. When the rotary drive device drives the spherical nozzle to rotate, the spherical nozzle continuously picks up new solution from the solution container. Under the high pressure of the high voltage generator, the surface of the spherical nozzle continuously generates an array of ionized materials, which moves toward the microfiber mesh. The induced annular electric field generated by the variable current coil assembly induces the ionized material array to move upward along the right-hand spiral. When the ionized material array continues to move toward the microfiber mesh, the electric field generated by the annular auxiliary electrode constrains the movement amplitude of the ionized material array. When the ionized material array gets closer to the microfiber mesh, the approximately horizontal centripetal magnetic field formed by the constant current coil assembly on the plane of the microfiber mesh causes the ionized material array to be deflected by the Lorentz force in this magnetic field. The horizontal component of its velocity decreases while the vertical component increases, allowing it to be deeply embedded in the microfiber mesh. Step 5: The resulting blended fiber web continues to be transported along the conveyor screen. The ion blower sprays ion wind at an inclined angle onto the blended fiber web. The ion wind neutralizes the residual charge in the micron fiber web that cannot be dissipated through the non-metallic conveyor screen, causing the gaps between fibers to shrink, which facilitates the smooth bundling of the blended fiber web into strips. The inclined blowing process can achieve horizontal relative displacement of the bottom layer fibers, causing the ionized material array to collapse, which is conducive to the high orientation arrangement of the ionized material array after the blended fiber web is subsequently bundled into strips. At the same time, it also increases the bonding area and bonding strength between nanofibers and microfibers. Finally, after the blended fiber web is bundled into strips, it is pressed by the pressing roller and wound up, and then processed by the subsequent spinning process to achieve the preparation of blended yarn.

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