CN113862799A - Electrostatic spinning needle head and electrostatic spinning method using same - Google Patents
Electrostatic spinning needle head and electrostatic spinning method using same Download PDFInfo
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- CN113862799A CN113862799A CN202111295185.XA CN202111295185A CN113862799A CN 113862799 A CN113862799 A CN 113862799A CN 202111295185 A CN202111295185 A CN 202111295185A CN 113862799 A CN113862799 A CN 113862799A
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- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
- D01D5/00—Formation of filaments, threads, or the like
- D01D5/0007—Electro-spinning
- D01D5/0061—Electro-spinning characterised by the electro-spinning apparatus
- D01D5/0069—Electro-spinning characterised by the electro-spinning apparatus characterised by the spinning section, e.g. capillary tube, protrusion or pin
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
- Y02P70/62—Manufacturing or production processes characterised by the final manufactured product related technologies for production or treatment of textile or flexible materials or products thereof, including footwear
Abstract
The invention provides an electrostatic spinning needle head and an electrostatic spinning method using the needle head, comprising the following steps: the needle body is provided with a first end part and a second end part which are oppositely arranged; the first end part is provided with a first end face far away from the second end part and a second end face surrounding the first end face; the transmission channel penetrates through the needle body and is used for transmitting the spinning solution, and an outlet of the transmission channel is positioned on the first end surface; the groove is formed in the needle body and is formed by sinking towards the second end part from the second end surface, the opening of the groove is positioned on the second end surface, and the opening is in an annular shape arranged around the outlet; the distance from the first end face to the second end portion is smaller than the distance from the bottom wall of the groove to the second end portion; in the radial direction of the needle body, the range of the maximum vertical distance from the axis of the transmission channel to the edge of the opening is d, and d belongs to [2mm,10mm ]; the invention can avoid the blockage of the needle head in the spinning process and greatly improve the productivity and the efficiency of equipment.
Description
Technical Field
The invention relates to the field of high-voltage electrostatic fiber spinning manufacturing, in particular to an electrostatic spinning needle head and an electrostatic spinning method using the same.
Background
The nanometer (micron) level fiber material produced in the electrostatic spinning manufacturing process has important application in the fields of materials, medical treatment, aerospace, environment, resources and the like. Since the last century where electrospinning fabrication technology has been proposed, scientists and engineers continue to focus on studying and developing its application for industrialization. The manufacturing technique of electrospinning fabrication has evolved from the first cylinder spinning to two major categories today: multi-needle spinning techniques and needleless spinning techniques. The multi-needle spinning is to spin by adopting a mode of a plurality of needles in the spinning process. Needleless spinning includes perturbation techniques (magnetic beads, air fields), rotation techniques (surface, spiral, disk), and wire-electric techniques (vibration, smearing, waterfall).
In the application process of the existing multi-needle spinning technology, because the needle head is a capillary tube, the spinning solution is excessively and quickly extracted and evaporated to cause the agglomeration and blockage of the inner hole of the needle tube, and the yield is extremely low; correspondingly, the needleless spinning technology develops more rapidly; pagoda and disc spinning technologies develop more rapidly in the needleless spinning technology; specifically, chinese patent application publication No.: 103088443, title of the invention: an umbrella-shaped electrostatic spinning nozzle and an electrostatic spinning method disclose a pagoda spinning technology, the design scheme is a multilayer disc-shaped structure, after liquid is contained, a contact layer (also called an adhesion layer) can be formed between the liquid level and a disc body due to the wettability of spinning liquid, and the solid-liquid contact process and the acting force between the solid-liquid contact process and the acting force are related to the inherent attribute surface tension of the spinning liquid; the disc simulation technology is a single-layer disc structure with a larger size, an outlet of a transmission channel is arranged at the center of the bottom of a disc, spinning solution is directly injected into the disc after coming out of the outlet of the transmission channel, and the formation of a Taylor cone is triggered at the tip of the edge of the disc after the disc is filled with the spinning solution.
In both implementations of the above needle-free spinning technique, the sharp liquid level angle formed by the liquid level profile and the disk part provides a natural point discharge location (disk edge) during electrospinning; that is, the sharper the angle formed at the position under the same potential, the higher the charge density at the position, the larger the electric field generated by the charge, and the larger the electric field force, the easier the formation of the taylor cone is triggered at the edge of the disk, and the stable fiber spinning is realized. Because the diameter of the disc part is larger, the upward pressure of the upwelling spinning solution in the central liquid outlet hole part is not used in the process of forming the Taylor cone, so that a large number of Taylor cones can be formed only along the circular arc surface of the disc edge; compared with needle spinning, the needle-free spinning technology solves the problems of needle blockage and low yield. However, the spinning solution has the disadvantage that the long-term contact with the external environment can cause evaporation and oxidation of the spinning solution, which is not favorable for ensuring the long-term stable quality of the fiber filaments.
So, this application improves to current many needles spinning technique, forms a novel electrostatic spinning syringe needle in order to solve above-mentioned problem.
Disclosure of Invention
The invention aims to provide an electrostatic spinning needle head and an electrostatic spinning method using the same.
In order to achieve one of the above objects, the present invention provides an electrospinning needle head, comprising: the needle body is provided with a first end part and a second end part which are oppositely arranged; the first end portion has a first end face disposed away from the second end portion and a second end face disposed around the first end face;
the transmission channel penetrates through the needle body and is used for conveying a spinning solution, and an outlet of the transmission channel is positioned on the first end face;
the groove is formed in the needle body and formed by sinking from the second end surface to the second end part, the opening of the groove is positioned on the second end surface, and the opening is in an annular shape surrounding the outlet;
the opening and the outlet have the same opening direction, the opening is provided with an inner side wall arranged close to the outlet and an outer side wall arranged far away from the outlet, and distance difference exists between any part of the inner side wall of the opening and the inner side wall of the outlet;
the distance from the first end surface to the second end part is smaller than the distance from the bottom wall of the groove to the second end part;
the maximum perpendicular distance of the transfer channel axis from the edge of the opening in the radial direction of the needle body is in the range d, d e [2mm,10mm ].
As a further development of the invention, the first end face and the second end face have a height difference in the axial direction of the needle body.
As a further improvement of the present invention, the distance from the first end face to the second end portion is greater than the distance from the second end face to the second end portion;
and d is greater than d1, d1 is the distance difference between the first end face and the second end face.
As a further improvement of the present invention, the first end face and the second end face are located on the same plane.
As a further improvement of the invention, the cross section of each part of the groove is circular along the axial direction of the needle body and in the direction extending from the surface of the first end surface and the second end surface closest to the second end part.
As a further development of the invention, the outer contour diameter of the cross-section decreases in the axial direction of the needle body and in the direction of extension from the first end to the second end, while the inner contour diameter of the cross-section remains constant or increases in a sequential manner.
As a further improvement of the present invention, the inner side wall of the outlet is stepped, and the cross-sectional area of the inner side wall near the first end is larger than the cross-sectional area of the inner side wall near the second end;
the step intersection of the inner side wall is arc intersection.
As a further development of the invention, the difference in distance between the first end face and the second end face is denoted by d1, d1 ∈ [ -0.5mm, 1mm ].
As a further improvement of the invention, the section radius of the opening is d, and d is equal to [2mm,8mm ];
let the difference in distance between the first end face and the second end face be denoted by d1, d1 e [ -0.5mm, 0.8mm ].
As a further improvement of the invention, the section radius of the opening is d, and d is equal to [2mm,6mm ];
let the difference in distance between the first end face and the second end face be denoted by d1, d1 e [ -0.5mm,0.6mm ].
As a further development of the invention, the outer edges of the outer side walls of the openings share the outer wall surface of the needle body.
As a further improvement of the invention, the needle body is of a hollow long-strip cylindrical structure, and the hollow part forms the transmission channel;
along the axial direction of the needle body, the transmission channel at least has a first transmission channel and a second transmission channel which are communicated with each other, and the first transmission channel and the second transmission channel are at least partially different in inner diameter size from each other.
As a further improvement of the present invention, the edge of the opening inner side wall and the edge of the outlet outer side wall are connected by an arc surface.
In order to achieve the above object, according to another embodiment of the present invention, there is provided an electrospinning method including: carrying out electrostatic spinning by adopting the electrostatic spinning nozzle;
the method comprises the following steps:
s1, continuously inputting the spinning solution, and enabling the spinning solution to pass through the transmission channel and flow out from the outlet;
s2, when the spinning solution overflows from the outlet and fills the groove, the spinning solution continuously arches upwards from the groove, and when an arc-shaped liquid film covering the outlet is formed on the surface of the groove with the outlet as the center, a high-voltage static electricity generating device electrically connected with the needle head is started to supply power to the spinning solution;
and S3, after the power supply is started, the spinning solution forms a plurality of jet flows on the arc-shaped liquid film so as to be separated from the surface of the liquid film and transferred to the spinning receiving end.
The invention has the beneficial effects that: according to the electrostatic spinning needle head and the electrostatic spinning method using the needle head, the outlets and the grooves of the transmission channels are formed in the different end faces of the small-size needle body, so that an arc-shaped liquid film can be formed at the liquid outlet position of the small-size needle head, and the spinning solution forms jet flow on the arc-shaped liquid film for spinning, therefore, the needle head is prevented from being blocked in the spinning process, and the productivity and the efficiency of equipment are greatly improved.
Drawings
FIG. 1A is a schematic structural view of an electrospinning needle head provided in the first embodiment of the present invention;
FIG. 1B is a schematic structural diagram of an electrostatic spinning needle according to a first embodiment of the present invention after forming a liquid film and a jet stream during an application process;
FIG. 2A is a schematic structural diagram of an electrospinning needle head provided in the second embodiment of the present invention;
FIG. 2B is a schematic structural diagram of an electrostatic spinning needle according to a second embodiment of the present invention after forming a liquid film and a jet stream during the application process;
FIG. 3A is a schematic structural diagram of an electrospinning needle head provided in the third embodiment of the present invention;
FIG. 3B is a schematic structural diagram of an electrostatic spinning needle according to a third embodiment of the present invention after forming a liquid film and a jet stream during the application process;
FIG. 4A is a schematic structural diagram of an electrospinning needle head provided in the fourth embodiment of the present invention;
FIG. 4B is a schematic structural diagram of an electrostatic spinning needle according to a fourth embodiment of the present invention after forming a liquid film and a jet stream during the application process;
fig. 5 is a schematic flow chart of an electrospinning method according to an embodiment of the present invention.
Detailed Description
The present invention will be described in detail below with reference to embodiments shown in the drawings. The present invention is not limited to the embodiment, and structural, methodological, or functional changes made by one of ordinary skill in the art according to the embodiment are included in the scope of the present invention.
It is to be noted that technical terms or scientific terms used in the embodiments of the present disclosure should have a general meaning as understood by those having ordinary skill in the art to which the present disclosure belongs, unless otherwise defined. The use of "first," "second," and similar terms in the embodiments of the disclosure is not intended to indicate any order, quantity, or importance, but rather to distinguish one element from another. The word "comprising" or "comprises", and the like, means that the element or item listed before the word covers the element or item listed after the word and its equivalents, but does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships may also be changed accordingly.
In addition, it should be emphasized that, during the use process, the needle body of the electrostatic spinning needle of the present invention is preferably disposed in the direction perpendicular to the horizontal plane, and the outlet of the transmission channel is disposed upward, so as to facilitate the upward excitation of the jet formed by the spinning solution.
Referring to fig. 1A, 1B,2A, 2B,3A, 3B,4A, and 4B, the electrospinning needle according to the present invention includes: a needle body 10, said needle body 10 having a first end 20 and a second end 30 arranged oppositely; the first end 20 has a first end face 21 disposed distal from a second end 30 and a second end face 23 disposed about the first end face 21; a delivery channel 40 extending through the needle body 10 and used for delivering a spinning solution, an outlet 41 of the delivery channel 40 being located at the first end face 21; a groove 24 formed in the needle body 10 and recessed from the second end surface 23 toward the second end 30, wherein an opening 241 of the groove 24 is located on the second end surface 23, and the opening 241 is annular and disposed around the outlet 41; the opening 241 and the outlet 41 have the same opening direction, the opening 241 has an inner side wall 2411 disposed adjacent to the outlet 41 and an outer side wall 2412 disposed away from the outlet 41, and any portion of the inner side wall 2411 of the opening has a distance difference with the inner side wall of the outlet 41;
the distance from the first end surface 21 to the second end 30 is smaller than the distance from the bottom wall of the groove 24 to the second end 30;
the maximum perpendicular distance of the axis of the transfer channel 40 from the edge of the opening 241 in the radial direction of the needle body is in the range d, d e [2mm,10mm ]. Accordingly, let the distance difference between the first end face 21 and the second end face 23 be denoted by d1, d1 e [ -0.5mm, 1mm ].
In a preferred embodiment of the invention, d is [2mm,8mm ]; accordingly, the d1 e [ -0.5mm, 1mm ], preferably, d1 e [ -0.5mm, 0.8mm ].
In a further preferred embodiment of the invention, d e [2mm,6mm ]; accordingly, the d1 e [ -0.5mm, 1mm ], or d1 e [ -0.5mm, 0.8mm ], is preferably [ -0.5mm,0.6mm ].
As shown in fig. 1A, the electrospinning needle head according to the first embodiment of the present invention has a height difference between the first end surface 21 and the second end surface 23 in the axial direction of the needle body 10.
Preferably, the distance from the first end surface 21 to the second end portion 30 is greater than the distance from the second end surface 23 to the second end portion 30; and d is greater than d1, d1 is the distance difference between the first end face and the second end face.
In an implementation manner of the present invention, the shape of the groove 24 may be changed as required; specifically, along the axial direction of the needle body, as long as the section of the opening 241 is circular, the section shapes of other parts of the groove 24 are not limited, and the design mode of the section of the groove 24 can achieve the purpose of the invention; namely, under a stable state, after the groove 24 is filled with the spinning solution, an arc-shaped liquid level is formed on the surface of the groove 24, the spinning solution is continuously injected, and in the power supply process of the spinning solution, the spinning solution forms jet flow on the arc-shaped liquid level to transfer to a spinning receiving end, so that spinning collection is realized, and the yield is improved.
Preferably, the cross-section of each part of the groove 24 is circular along the axial direction of the needle body and in the direction from the surface of the first end surface 21 and the second end surface 23 closest to the second end 30; in this way, d is the cross-sectional radius of opening 241.
Preferably, the outer diameter of the circular cross-section of the groove 24 decreases in the axial direction of the needle body and in the direction of extension from the first end 20 to the second end 30, and the inner diameter of the circular cross-section of the groove 24 remains constant or increases in a sequential manner.
It should be emphasized that, in order to save cost and facilitate mold opening, the needle body 10 has a hollow elongated cylindrical structure, and the hollow portion forms the transmission channel 40. Of course, along the axial direction of the needle body 10, the cross section of the transmission channel 40 can be specifically changed as required, for example, it is triangular, positive, polygonal, etc., and further description thereof is omitted.
Preferably, the outer edge of the outer sidewall of the opening 241 shares the outer wall surface of the needle body 10, that is, an annular edge is formed at the outer edge of the outer sidewall of the opening 241, so as to reduce the overall occupied space of the needle body 10.
Preferably, said delivery channel 40 has at least a first delivery channel 41 and a second delivery channel 42 communicating with each other in the axial direction of the needle body, said first delivery channel 41 and said second delivery channel 42 at least partially having inner diameters of different sizes from each other.
In a specific embodiment of the present invention, the cross-sections of the first transmission channel 41 and the second transmission channel 42 are circular, and the cross-sectional diameter of the first transmission channel 41 is larger than the cross-sectional diameter of the second transmission channel 42; through setting up a plurality of transmission passageways that the internal diameter size is different, can change the transmission speed of spinning solution, and then change to the power of each direction that spinning solution produced, be favorable to spinning solution to form and form the efflux on the liquid film surface, and improve output.
Preferably, the edge of the inner side wall of the opening 241 is connected with the edge of the outer side wall of the outlet 41 by an arc surface, so as to increase the speed of the spinning solution flowing into the groove 24 after flowing out from the outlet 41.
With reference to fig. 2A, an electrospinning needle according to a second embodiment of the present invention is improved based on the electrospinning needle according to the first embodiment, and the difference is that in the electrospinning needle according to the second embodiment, the first end face 21 and the second end face 23 are located on the same plane, that is, the value of d1 is zero, and the arrangement and the form of other parts of the electrospinning needle according to the second embodiment are the same as those of the electrospinning needle according to the first embodiment, and further description thereof is omitted.
With reference to fig. 3A, an electrospinning needle according to a third embodiment of the present invention is improved based on the electrospinning needle according to the first embodiment, and the difference is that in the electrospinning needle according to the second embodiment, a distance between the first end surface 21 and the second end portion 30 is smaller than a distance between the second end surface 23 and the second end portion 30, and the arrangement and the form of other components of the electrospinning needle according to the third embodiment are the same as those of the electrospinning needle according to the first embodiment, and further description thereof is omitted.
Referring to fig. 4A, an electrospinning needle according to a fourth embodiment of the present invention is improved over the electrospinning needle according to the first embodiment, except that in the electrospinning needle according to the fourth embodiment, the inner side wall 2411 of the outlet 41 is stepped, and the cross-sectional area of the inner side wall 2411 near the first end 20 is larger than the cross-sectional area of the inner side wall 2411 near the second end 30; the step intersections of the inner side walls 2411 are arc intersections. In this fourth embodiment, the path length of the spinning solution injected from the outlet 41 into the groove 24 is increased to increase the area of the thin liquid layer formed during the spinning solution passes through the outlet 41 to the groove 24, thereby enlarging the area of influence of the steady-state pressure of the outlet 41. Specifically, when the inner side wall 2411 is designed to be step-shaped, in the process that the spinning solution fluid is injected into the groove 41 along the inner side wall 2411, the original stable laminar flow of the fluid is damaged by the resistance of the step surface, and then irregular fluid motion is formed, so that the component velocity perpendicular to the inner side wall 2411 is formed, turbulence is generated, part of the spinning solution is changed from the downward motion direction to the upward motion direction, the pressure effect of the surface of the liquid film on the spinning solution is further resisted, and the escape of the electrospinning jet flow is easier to realize. The arrangement and form of other parts of the electrospinning needle head of the fourth embodiment are the same as those of the electrospinning needle head of the first embodiment, and further description thereof is omitted.
Referring to fig. 1B, 2B, 3B, 4B and 5, an embodiment of the present invention provides a method for electrospinning using the electrospinning nozzle described above, where the method includes:
s1, continuously inputting the spinning solution, and enabling the spinning solution to pass through the transmission channel and flow out from the outlet;
s2, when the spinning solution overflows from the outlet and fills the groove, the spinning solution continuously arches upwards from the groove, and when an arc-shaped liquid film covering the outlet is formed on the surface of the groove with the outlet as the center, a high-voltage static electricity generating device electrically connected with the needle head is started to supply power to the spinning solution;
and S3, after the power supply is started, the spinning solution forms a plurality of jet flows on the arc-shaped liquid film so as to be separated from the surface of the liquid film and transferred to the spinning receiving end.
For step S1, after the electrospinning device equipped with the electrospinning needle as described above is started up, the spinning solution is continuously output from the inlet of the transfer passage to the outlet of the transfer passage.
For step S2, after the spinning solution overflows from the outlet of the conveying channel, the spinning solution is injected into the groove along the arc surface between the edge of the outer side wall of the outlet and the edge of the inner side wall of the opening; after the groove is filled with the spinning solution, an arc-shaped liquid film coating the outlet of the transmission channel is formed on the surface of the groove with the outlet as the center of the spinning solution; at this time, electricity was supplied to the spinning solution. Accordingly, the arc-shaped liquid film is shown in dotted lines in fig. 1B, 2B, 3B, and 4B.
In step S3, when the voltage is gradually increased and reaches the steady state, a plurality of jets are formed on the arched liquid film, and the jet is separated from the surface of the liquid film and transferred to the spinning receiving end along with the continuous electric stretching of the spinning solution. Accordingly, the multiple jets are shown in dashed lines in FIGS. 1B, 2B, 3B, and 4B.
At the same time, the spinning receiving end, usually the primary backing, receives the jet, completing the spinning job.
According to the electrostatic spinning method, the excitation of jet fibers needs to be separated from the pressure constraint of an arc-shaped liquid film; in the process of gradually increasing the voltage, the spinning solution below the liquid film is subjected to the surface tension pointing to the inside of the liquid film, the additional pressure caused by the arc-shaped liquid film surface and the continuous upward steady-state pressure provided by the outlet to form the arc-shaped liquid film, and the jet flow is more easily separated from the constraints caused by the surface tension and the additional pressure of the liquid film under the synchronous action of the pressures; in the whole process, the surface tension of the spinning solution, the additional pressure of the arc-shaped liquid film and the self gravity are partially offset by the upward outlet pressure, so that the spinning solution is excited on the surface of the arc-shaped liquid surface; and the generation quantity and probability of Taylor cones in the process of exciting the spinning solution are increased, and compared with a single Taylor cone of a common electrostatic spinning needle, the spinning needle has higher spinning yield.
According to the electrostatic spinning needle head and the electrostatic spinning method using the needle head, the outlets and the grooves of the transmission channels are arranged on different end faces of the small-size needle body, so that an arc-shaped liquid film can be formed at the liquid outlet position of the small-size needle head, and a spinning solution forms jet flow on the arc-shaped liquid film for spinning, and therefore, the liquid film liquid storage capacity can be still sufficient even under the conditions that voltage is too large and the solution liquid outlet amount is increased due to manual misoperation, the transmission channel connected with the outlets cannot be rapidly contacted with outside air, the generation of scale in the transmission channel is avoided, the smooth liquid outlet of the spinning solution is ensured, and the needle head is effectively prevented from being blocked; in addition, the formation of the arc-shaped liquid film increases the generation quantity and probability of Taylor cones in the process of exciting the spinning solution, and has larger spinning yield compared with a single Taylor cone of a common needle.
It should be understood that although the present description refers to embodiments, not every embodiment contains only a single technical solution, and such description is for clarity only, and those skilled in the art should make the description as a whole, and the technical solutions in the embodiments can also be combined appropriately to form other embodiments understood by those skilled in the art.
The above-listed detailed description is only a specific description of a possible embodiment of the present invention, and they are not intended to limit the scope of the present invention, and equivalent embodiments or modifications made without departing from the technical spirit of the present invention should be included in the scope of the present invention.
Claims (14)
1. An electrospinning needle head, comprising:
the needle body is provided with a first end part and a second end part which are oppositely arranged; the first end portion has a first end face disposed away from the second end portion and a second end face disposed around the first end face;
the transmission channel penetrates through the needle body and is used for conveying a spinning solution, and an outlet of the transmission channel is positioned on the first end face;
the groove is formed in the needle body and formed by sinking from the second end surface to the second end part, the opening of the groove is positioned on the second end surface, and the opening is in an annular shape surrounding the outlet;
the opening and the outlet have the same opening direction, the opening is provided with an inner side wall arranged close to the outlet and an outer side wall arranged far away from the outlet, and distance difference exists between any part of the inner side wall of the opening and the inner side wall of the outlet;
the distance from the first end surface to the second end part is smaller than the distance from the bottom wall of the groove to the second end part;
the maximum perpendicular distance of the transfer channel axis from the edge of the opening in the radial direction of the needle body is in the range d, d e [2mm,10mm ].
2. The electrospinning needle head of claim 1, wherein there is a height difference between the first end face and the second end face in the axial direction of the needle body.
3. The electrospinning needle of claim 2, wherein the distance from the first end face to the second end is greater than the distance from the second end face to the second end;
and d is greater than d1, d1 is the distance difference between the first end face and the second end face.
4. The electrospinning needle of claim 1, wherein the first end face and the second end face lie in the same plane.
5. The electrospinning needle head of claim 1, wherein the grooves are circular in cross-section along the axial direction of the needle body and extend from the first end face and the second end face closest to the second end portion.
6. The electrospinning needle head of claim 5, wherein the outer profile diameter of the cross-section decreases sequentially and the inner profile diameter of the cross-section remains the same or increases sequentially in an axial direction of the needle body and in an extending direction from the first end portion to the second end portion.
7. The electrospinning needle of claim 5, wherein the inside perimeter wall of the outlet is stepped, and the cross-sectional area of the inside perimeter wall near the first end is larger than the cross-sectional area of the inside perimeter wall near the second end;
the step intersection of the inner side wall is arc intersection.
8. The electrospinning needle head of claim 1, wherein the difference in distance between the first end face and the second end face is represented by d1, and d1 e [ -0.5mm, 1mm ].
9. An electrospinning needle head according to claim 5, wherein the cross-sectional radius of the opening is d, d e [2mm,8mm ];
let the difference in distance between the first end face and the second end face be denoted by d1, d1 e [ -0.5mm, 0.8mm ].
10. An electrospinning needle head according to claim 5, wherein the cross-sectional radius of the opening is d, d e [2mm,6mm ];
let the difference in distance between the first end face and the second end face be denoted by d1, d1 e [ -0.5mm,0.6mm ].
11. The electrospinning needle head of claim 1, wherein the outer edges of the outer sidewall of the opening share the outer wall surface of the needle body.
12. The electrospinning needle head of claim 1, wherein the needle body is a hollow elongated cylindrical structure, and the hollow portion forms the transmission channel;
along the axial direction of the needle body, the transmission channel at least has a first transmission channel and a second transmission channel which are communicated with each other, and the first transmission channel and the second transmission channel are at least partially different in inner diameter size from each other.
13. The electrospinning needle head of claim 1, wherein the edge of the inside peripheral wall of the opening and the edge of the outside peripheral wall of the outlet are connected by an arc surface.
14. An electrospinning method, characterized in that electrospinning is carried out using the electrospinning nozzle according to any one of claims 1 to 13;
the method comprises the following steps:
s1, continuously inputting the spinning solution, and enabling the spinning solution to pass through the transmission channel and flow out from the outlet;
s2, when the spinning solution overflows from the outlet and fills the groove, the spinning solution continuously arches upwards from the groove, and when an arc-shaped liquid film covering the outlet is formed on the surface of the groove with the outlet as the center, a high-voltage static electricity generating device electrically connected with the needle head is started to supply power to the spinning solution;
and S3, after the power supply is started, the spinning solution forms a plurality of jet flows on the arc-shaped liquid film so as to be separated from the surface of the liquid film and transferred to the spinning receiving end.
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| Publication number | Priority date | Publication date | Assignee | Title |
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