阅读说明：本技术 一种分体式静电纺丝针头及纺丝组件 (Split type electrostatic spinning syringe needle and spinning subassembly ) 是由 董祥 于 2021-07-09 设计创作，主要内容包括：本发明公开了一种分体式静电纺丝针头,包括针头基座、针头以及限位锁紧帽；针头包括安装基座以及针管,安装基座内部设有上细下粗的锥形腔,针管一体成型于安装基座的顶部；针管内设有针孔,针孔与所述锥形腔连通；安装基座的底部周缘向四周延伸形成锁板；针头基座中具有贯通的注液孔,针头基座的上端具有与所述锥形腔匹配的锥形导入部,针头基座的中部具有锁紧螺纹部；当安装基座通过锥形腔插装于锥形导入部上时,限位锁紧帽可螺合于针头基座上的锁紧螺纹部上并压紧安装基座的锁板,从而将针头锁紧于针头基座上。本发明的分体式静电纺丝针头,能够实现高效生产,且得到的覆纳米纤维网或膜的滤材更加高效低阻。(The invention discloses a split type electrostatic spinning needle head, which comprises a needle head base, a needle head and a limiting locking cap, wherein the needle head base is provided with a needle head base; the needle head comprises a mounting base and a needle tube, a tapered cavity with a thin upper part and a thick lower part is arranged in the mounting base, and the needle tube is integrally formed at the top of the mounting base; a needle hole is arranged in the needle tube and is communicated with the conical cavity; the periphery of the bottom of the mounting base extends to the periphery to form a locking plate; a penetrating liquid injection hole is formed in the needle head base, a conical guide-in part matched with the conical cavity is formed at the upper end of the needle head base, and a locking thread part is formed in the middle of the needle head base; when the mounting base is inserted on the conical leading-in part through the conical cavity, the limiting locking cap can be screwed on the locking thread part on the needle head base and tightly press the locking plate of the mounting base, so that the needle head is locked on the needle head base. The split type electrostatic spinning needle head can realize high-efficiency production, and the obtained filter material coated with the nanofiber mesh or the nanofiber membrane is higher in efficiency and lower in resistance.)

1. A split type electrostatic spinning needle head is characterized by comprising a needle head base, a needle head and a limiting locking cap which are arranged in a split manner;

the needle head comprises a mounting base and a needle tube, a tapered cavity with a thin upper part and a thick lower part is arranged in the mounting base, and the needle tube is integrally formed at the top of the mounting base; a needle hole is arranged in the needle tube and is communicated with the conical cavity; the periphery of the bottom of the mounting base extends to the periphery to form a locking plate;

the needle head base is internally provided with a through liquid injection hole, the upper end of the needle head base is provided with a conical leading-in part matched with the conical cavity, and the middle part of the needle head base is provided with a locking thread part;

when the mounting base is inserted into the conical leading-in part through the conical cavity, the limiting locking cap can be screwed on the locking thread part on the needle head base and tightly press the locking plate of the mounting base, so that the needle head is locked on the needle head base.

2. The split electrospinning needle head of claim 1, wherein the needle head, needle head base and retaining locking cap are all made of PP, POM or PEEK materials.

3. The split type electrostatic spinning needle head according to claim 2, wherein the needle hole in the needle tube is prepared by an etching processing and punching process, the aperture of the needle hole is 0.01-0.06 mm, and the processing precision of the hole is less than or equal to +/-0.001 mm.

4. The split type electrospinning needle head according to claim 3, wherein the inner wall of the pinhole is polished by a fluid polishing machine, and the surface roughness of the inner wall of the pinhole after polishing reaches 12 levels.

5. The split electrospinning needle head of claim 1, wherein the front end of the needle tube is tapered.

6. The split type electrospinning needle head of claim 1, wherein the mounting base is integrally truncated cone-shaped.

7. The split type electrospinning needle head according to claim 1, wherein the outer surface of the limiting locking cap is provided with anti-slip patterns.

8. The split type electrospinning needle head of claim 1, wherein a locking baffle is integrally formed on the needle head base at the end of the locking thread part.

9. The split electrospinning needle of claim 1, wherein the needle base has a mounting thread portion at a lower end thereof.

10. A spin pack assembly comprising the split electrospinning needle of any of claims 1 to 9.

Technical Field

The invention relates to the technical field of electrostatic spinning equipment, in particular to a split type electrostatic spinning needle head and a spinning assembly.

Background

In 1934, Formhals invented experimental apparatus for preparing polymer fibers using electrostatic force and applied for a patent which issued a patent on how polymer solution forms jet flow between electrodes, which is the first patent describing in detail apparatus for preparing fibers using high voltage static electricity, and is recognized as the beginning of the electrostatic spinning technology for preparing fibers. Formhals uses a hollow tube type spinneret similar to a syringe needle.

The high-pressure electrostatic spinning nano-fiber provides a brand new solution for the application of the air filtration aspect. With the increasing maturity of the application of nano-fiber in more air filtration industries, people also continuously put forward new requirements on the filtration performance pressure drop of electrostatic spinning nano-fiber. In particular to the technical characteristics that a mask, heavy truck integrated air filter paper, a trolley air conditioner plate filter, an industrial dust removal filter core material, a gas turbine air inlet system and a building fresh air system pursue high efficiency and low resistance. The safety and the comfortableness of wearing the mask are determined by the high efficiency and the low resistance, and the economy and the environmental protection are better reflected by the high efficiency and the low resistance for vehicles, industrial dust removal filter core materials, gas turbine air inlet systems, building fresh air system air inlet filter materials and trolley air conditioner plate filter materials.

Factors influencing high efficiency and low resistance are many, in the preparation process of the nanofiber net or the nanofiber membrane, the diameter of the nanofiber is thinner, the pore is smaller, the porosity is higher, the prepared nanofiber filter material is higher in efficiency, and the resistance is smaller. In the preparation of superfine fiber, the lower the solution viscosity, the higher the solution conductivity and the thinner the spinning needle, the thinner the diameter of the produced nanofiber, thereby realizing high efficiency and low resistance. In order to achieve the characteristics in industrial production, the current high-voltage electrostatic spinning equipment has the problem of low production efficiency from needle-free spinning to needle-spinning, so that the production cost of the nanofiber filter material is increased.

When the viscosity of the solution is too low in needleless spinning such as patents CN104532482B and CN110230107A, enough solution cannot be attached to the steel wire of patent CN104532482B and the spiral blade of patent CN110230107A, so that the spinning per unit time is reduced, and the production efficiency of the whole equipment is affected, which is also the reason why the needleless high voltage electrostatic spinning is difficult to produce the ultrafine nano fiber material industrially.

In the process of spinning with needles, such as in patent CN207391604U, due to the low viscosity of the solution system, the solution flows out at the lowest position of the notch and bevel, resulting in insufficient solution at the top of the needle head, which seriously affects the yield. The needle spinneret adopts a stainless steel capillary tube sold in the market as a spinneret tube, the minimum inner diameter of the stainless steel capillary tube is 0.16mm (the inner diameter is 0.16mm, and the outer diameter is 0.31mm), the controllability of liquid supply amount is influenced, and under the condition that the inner diameter cannot be made smaller, in order to avoid the excessive outflow of liquid supply to pollute the spinning environment, only low-pressure liquid supply is adopted. And the low-pressure liquid supply can influence the fluency of the solution, and under the condition of long-time continuous work, the capillary is easily blocked due to overlong stainless steel capillary and overlarge roughness of the inner wall. The blockage of the needles in the spinning needle group can cause the defects of needle missing and empty in the nanometer fiber net and the membrane, thereby affecting the filtering efficiency of the material. Secondly, in long-term industrial production, the capillary structure is difficult to clean after shutdown, and under the condition of cleaning by adopting a solvent solution system, a large amount of solvent is used in the cleaning process, and high-power ultrasonic waves are used, so that a large amount of manpower and material resources are consumed. In addition, the stainless steel capillary is implanted into the metal base, and the base is easy to cause solvent corrosion in the cleaning process of the needle head; in the process of disassembling the needle head, the stainless steel capillary tube does not have external force straightening and reducing property, so that the stainless steel capillary tube is easy to bend due to external force, and the loss is overlarge. Moreover, if the wall of the stainless steel capillary has solution residue with strong conductivity, potential difference can occur between the needles, and along with the continuous accumulation of charges, creepage and fire phenomena can occur, so that great potential safety hazards exist.

In large-scale production, tens of thousands of spinning needles are usually arranged. In the multi-needle equipment, in order to make the product even, a plurality of needles are arranged in a certain arrangement mode matrix, and spinning is carried out simultaneously under the action of an electric field. In a multi-tip apparatus, the electric fields between the spinnerets interfere with each other, which limits the minimum distance of arrangement of the spinnerets or the maximum density of distribution of the spinnerets, thereby indirectly affecting the production efficiency of the apparatus.

Disclosure of Invention

The technical problem to be solved by the invention is to provide a split type spinning needle head which can be better suitable for electrostatic spinning superfine nano fibers in industrial production, the spinning needle head can realize high-efficiency production, and the obtained filter material coated with a nano fiber net or film has higher efficiency and lower resistance.

In order to solve the technical problems, the invention provides the following technical scheme:

the invention provides a split type electrostatic spinning needle head, which comprises a needle head base, a needle head and a limiting locking cap, wherein the needle head base, the needle head and the limiting locking cap are arranged in a split manner;

the needle head comprises a mounting base and a needle tube, a tapered cavity with a thin upper part and a thick lower part is arranged in the mounting base, and the needle tube is integrally formed at the top of the mounting base; a needle hole is arranged in the needle tube and is communicated with the conical cavity; the periphery of the bottom of the mounting base extends to the periphery to form a locking plate;

the needle head base is internally provided with a through liquid injection hole, the upper end of the needle head base is provided with a conical leading-in part matched with the conical cavity, and the middle part of the needle head base is provided with a locking thread part;

when the mounting base is inserted into the conical leading-in part through the conical cavity, the limiting locking cap can be screwed on the locking thread part on the needle head base and tightly press the locking plate of the mounting base, so that the needle head is locked on the needle head base.

Furthermore, the needle head base and the limiting locking cap are all made of PP, POM or PEEK materials.

Furthermore, the needle hole in the needle tube is prepared by adopting an etching processing and punching process, the aperture of the needle hole is 0.01-0.06 mm, and the processing precision of the hole is less than or equal to +/-0.001 mm.

Further, the inner wall of the pinhole is polished by a fluid polishing machine, and the surface roughness of the polished inner wall of the pinhole reaches 12 levels.

Further, the front end of the needle tube is provided with a taper, and the taper is preferably 65-85 degrees.

Furthermore, the whole installation base is in a circular truncated cone shape.

Further, the outer surface of the limiting locking cap is provided with anti-skid patterns.

Further, a locking baffle is integrally formed at the end of the needle base located at the locking thread part.

Further, the lower end of the needle base is provided with a mounting threaded part.

The invention also provides a spinning assembly which comprises the split type electrostatic spinning needle head.

Compared with the prior art, the invention has the beneficial effects that:

1. the split electrostatic spinning needle head is prepared from PEEK materials, the pinhole aperture of the needle head can be made smaller, high-pressure liquid supply can be realized, and the solution amount is more controllable; the insulating property of the needles is better, the field intensity mutual interference among the needles in the matrix is smaller when the needles are used for large-scale production, and the electrostatic spinning equipment can arrange more spinnerets in a more dense arrangement mode, so that efficient electrostatic spinning can be performed.

2. The split electrostatic spinning needle head is not easy to block, and the electrostatic spinning equipment has longer continuous operation capability, so that the industrial production efficiency is further improved, and the split electrostatic spinning needle head is easy to clean after being stopped.

3. According to the split type electrostatic spinning needle, the needle head and the needle head base are arranged in a split manner, the needle head base is fixed on the spinning unit base plate for a long time, and the needle head base does not need to be frequently detached, so that the service life of the split type electrostatic spinning needle is prolonged; when the whole batch of production tasks is completed or the production is stopped for maintenance, only the needle head needs to be replaced, so that the labor is saved, and the replaced needle head is easier to clean. The limiting locking cap facilitates rapid installation of the needle heads, installation is carried out through uniform thread pitches, and the height of the needle heads is uniform.

Drawings

FIG. 1 is a schematic structural diagram of a split-type electrospinning needle head of the present invention;

FIG. 2 is a schematic view of the needle;

FIG. 3 is a schematic view of the structure of the needle base;

FIG. 4 is a schematic structural view of a limit lock cap;

wherein: 100. a needle head; 110. a needle tube; 111. a pinhole; 112. a conical surface; 120. mounting a base; 121. a locking plate; 200. a needle head base; 210. a tapered lead-in portion; 220. locking the threaded part; 230. locking the baffle; 240. installing a threaded part; 300. a limiting locking cap; 310. anti-skid patterns.

Detailed Description

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

As described in the background art, in the industrial production of nanofiber filters, the lower the solution viscosity, the higher the solution conductivity, and the finer the spinning needle head, in order to achieve high efficiency and low resistance. However, the current high-voltage electrostatic spinning equipment has the problem of low production efficiency from needle-free spinning to needle-spinning, so that the production cost of the nanofiber filter material is increased.

In order to solve the technical problem, the inventor provides a split type electrostatic spinning needle head through long-term research. As shown in fig. 1, the split electrospinning needle comprises a needle base 200, a needle 100 and a limit locking cap 300 which are separately arranged.

Referring to fig. 2, the needle 100 includes a mounting base 120 and a needle tube 110, wherein the mounting base 120 is a circular truncated cone, and a tapered cavity with a thin upper part and a thick lower part is formed inside the mounting base 120. The needle tube 110 is integrally formed on the top of the mounting base 120, a needle hole 111 is formed in the needle tube 110, and the needle hole 111 is communicated with the conical cavity. Preferably, the front end of the needle tube 110 is provided with a conical surface 112, and the taper of the conical surface 112 is preferably 65-85 °. The bottom periphery of the mounting base 120 extends to the periphery to form a locking plate 121.

In the present invention, the needle 100 is preferably made of polypropylene (PP), Polyoxymethylene (POM) or Polyetheretherketone (PEEK) materials, which have good machinability, insulation properties and solvent resistance. The needle 100 is further preferably made from a PEEK material, more preferably victrex (wages) 150G PEEK in the uk.

PEEK is recognized as the best performing thermoplastic material currently available. The main physical properties of 150G PEEK are summarized below:

1) high temperature performance: the glass transition temperature of PEEK polymers and compounds is typically 143 ℃ and the melting point is 343 ℃;

2) electrical properties: at a wide range of frequencies and temperaturesWithin the range of degrees, the PEEK polymer can keep the electrical performance of the PEEK polymer unchanged, and the insulation strength of the PEEK polymer measured by a 0.005cm film is 190KVcm^-1@ASTM D149；

3) The processing performance is as follows: density 1.32g cm^-3@ ASTM D792, tensile strength 14500psi @ ASTM D638, flexural strength 24650psi @ ASTM D790, Rockwell hardness 126/99 grade R, grade M @ ASTM D785.

4) Chemical resistance: even at high temperatures, PEEK polymers are well resistant to most environments, and the only solvent for PEEK polymers at ambient temperatures is concentrated sulfuric acid.

Based on the excellent characteristics of 150G PEEK, the needle head made of 150G PEEK has excellent chemical corrosion resistance, and all solvents except concentrated sulfuric acid can not be dissolved at normal temperature, so that the problem that the existing metal needle head is easy to dissolve and corrode in the cleaning process, and the aging and damage are caused is solved. In addition, because the spinning needle head made of 150G PEEK material is suitable for most solvent systems except concentrated sulfuric acid, the solution system suitable for the needle head is wide.

And secondly, the needle head made of 150G PEEK has excellent electrical insulation performance, and the problem that the field intensity of the needle head is interfered with each other and the spinning is influenced because a large number of metal needle heads are arranged in a unit area in order to improve the production efficiency in the large-scale production process is solved. The 150G PEEK insulation strength reaches 190KVcm^-1@ ASTM D149 (by 0.005cm film), and the PEEK polymer retains its electrical properties over a wide range of frequencies and temperatures. The needle head made of 150G PEEK can effectively reduce the mutual interference of electric fields among electrostatic spinning nozzles, so that efficient electrostatic spinning can be carried out in a more dense arrangement mode and by adopting more nozzles.

Finally, 150G PEEK has good machining properties, and a needle made of 150G PEEK can be etched through the needle tube 110 by an etching process. The aperture of the etching processing can reach 0.01-0.06 mm, which is far smaller than the minimum aperture of the stainless steel needle head of 0.16mm, so that the controllability of liquid supply during spinning can be improved, the diameter of the produced nano fiber is thinner, the filtering efficiency of the nano fiber net film is improved, and the resistance is reduced. In addition, the machining precision of hole is less than or equal to +/-0.001 mm, the inner wall of the pinhole is polished by a fluid polishing machine, and the surface roughness of the inner wall of the pinhole after polishing reaches 12 grades, namely Ra 0.050, so that the situation of blockage is not easy to occur in the spinning process.

Referring to fig. 3-4, the needle base 200 has a liquid injection hole therethrough, and the upper end of the needle base 200 has a tapered guide portion 210 matching with the tapered cavity, so that the needle 100 can be inserted into the needle base 200, and the liquid injection hole in the needle base 200 is communicated with the needle hole 111 in the needle tube 110 to form a liquid flow passage. The middle of the needle base 200 is provided with a locking thread part 220, the limiting locking cap 300 can pass through the needle 100 and is screwed on the locking thread part 220 on the needle base 200, and at this time, the limiting locking cap 300 presses the locking plate 121 of the mounting base 120, so that the needle 100 is locked on the needle base 200. Preferably, a locking baffle 230 is integrally formed at the end of the needle base 200 at the locking thread part 220, so as to limit the limit locking cap 300; the needle base 200 has a mounting screw portion 240 at a lower end thereof to facilitate mounting of the needle 100 to the spinning device. Further, the outer surface of the limiting locking cap 300 is provided with anti-slip patterns 310, and small-pitch threads are arranged inside the limiting locking cap, so that rapid positioning and locking are realized.

In the present invention, the needle base 200 and the locking stopper cap 300 are preferably made of PP, POM or PEEK material, and more preferably made of PEEK material.

According to the split type electrostatic spinning needle, the needle head and the needle head base 200 are arranged in a split mode, the needle head base 200 is fixed on the spinning unit substrate for a long time, frequent disassembly is not needed, and therefore the service life of the split type electrostatic spinning needle is prolonged; when the whole batch of production tasks is completed or the production is stopped for maintenance, only the needle head needs to be replaced, so that the labor is saved, and the replaced needle head is easier to clean. The limiting locking cap 300 facilitates quick installation of the needles, and installation is performed through uniform thread pitches, so that the heights of the needles are uniform.

The present invention is further described below in conjunction with specific examples to enable those skilled in the art to better understand the present invention and to practice it, but the examples are not intended to limit the present invention.

The experimental methods used in the following examples are conventional methods unless otherwise specified, and materials, reagents and the like used therein are commercially available without otherwise specified.

Example 1

1. Apparatus and instrument

The precision of a Lei Chen JT3000 electronic balance is 1mg, the Shanghai Lei pond DDS-11A desk type conductivity meter, the Lei Chen ndj-5s digital display viscometer, a KLEINWACHTER EFM122 probe type electrostatic field tester, a Phenom Pro electron microscope, a TEXTEST FX3300 air permeability tester, a TSI 8130A filtration efficiency tester and a Phenom fiber metric system.

Environment: constant temperature and humidity environment, temperature (25 +/-2) DEG C, relative humidity (25 +/-5)%, enthalpy value (40 +/-5) kJ and fresh air volume of 150m³Per, 160m of recovered air volume (exhaust air)³The pressure in the equipment is (3 +/-0.5) Pa, and the concentration of the solvent gas<(10±0.5)ppm。

The spinning machine model: n6250; a needle head: PEEK 34G inner diameter 0.06 mm; machine effective width: 62 cm; unreeling: magnetic powder type; winding: winding at the center; power: a servo motor; a high-voltage power supply: 50KV 200W; hydraulic pressure: 0.1pa to 2 pa.

2. Preparing spinning solution

Raw materials: PVDF resin, namely Kynar761PVDF powdery resin of France ARKEMA;

DMF, purity > 99.9% (GC), commercially available;

MEK, purity > 97.0% (GC), commercially available.

Base material: the commercial spun-bonded non-woven fabric is 25g, the width is 60cm, and the filtering efficiency is less than 5% @0.3 mu m aerosol.

Preparing a spinning solution:

the components are mixed according to the mixture ratio of DMF 549g, MEK366g, PVDF 80g and quaternary ammonium salt 5g to prepare 1000g of spinning solution. Parameters of the spinning solution: viscosity 160CPS, conductivity: 285 mu.S/cm.

3. Preparation of nanofiber composite filter material

25g of spunbonded non-woven fabric base material enters spinning flow equipment provided with a needle spinning group through an unreeling device, 1000g of prepared spinning solution is added into a solution bin and is supplied to a needle of the spinning group through a solution supply pump; then turning on the high-voltage power supply, adjusting the voltage to 50KV, under the action of the high-voltage electric field, the solution at the top ends of the plurality of spray heads enriches a large amount of charges to form electrostatic repulsion force, overcomes the surface tension of the polymer solution, and flies to the negative plate. And (3) forming the nano-scale fibers by the spinning solution, dropping the nano-scale fibers on the base material, and finally looping the nano-scale fibers by a winding device to obtain the nano-fiber composite filter material.

Comparative example 1

Comparative example 1 differs from example 1 only in that: the spinning needle adopted is a stainless steel needle with 30G inner diameter of 0.16 mm.

Table 1 shows the results of spinning using a common stainless steel spinning needle (30G 0.16mm ID) with a split needle of the invention (PEEK 34G 0.06mm ID).

Table 1 spinning results of example 1 and comparative example 1

Needle type	30G stainless steel needle	34G PEEK needle
			Number of needles	128 are	184
Pressure of liquid supply	2Pa	25Pa
			Spinning voltage	50kV	50kV
Spinning current	0.1mA	0.06mA
			Spinning group electrostatic field	35kV	44kV
Vehicle speed	2m/min	2m/min
			Average diameter of fiber	150nm	130nm
Resistance force	320Pa	55Pa
			Efficiency of filtration	Aerosol 90% @0.3 μm	Aerosol of 95% @0.3 μm
Ultrasonic cleaning time	1 hour	30 minutes

As can be seen from the above table, the number of stainless steel needles in comparative example 1: the 16 needles are arranged into 8 needles, and the total number is 128 needle head array arrangement. The stainless steel material does not have insulating property, the needles arranged in unit area are too dense, the electric fields in the needle matrix interact with each other to generate flying flocs or hanging nets at field intensity, the electric fields influence the needle point charge enrichment with each other, and then the spinning efficiency is low or even normal spinning cannot be realized. No more needles can be provided.

Number of PEEK needles in example 1: the 23-pin arrangement has 8 total 184 pin head array arrangements. Use the PEEK syringe needle can effectively reduce so can set up more syringe needles that electric field mutual interference between the electrostatic spinning spinneret. An electrospinning apparatus using PEEK needles can simultaneously perform efficient electrospinning using more needles in a more dense arrangement.

Under the condition of the same solution system and the same field intensity voltage, the smaller the inner diameter of the pinhole is, the larger the solution running pressure is to achieve the same solution supply amount; the larger the needle bore, the lower the solution pressure to maintain the feed volume. The low-pressure operation is easy to block, and the high-pressure operation is not easy to block. The stainless steel capillary in comparative example 1 has thin wall, long capillary, difficult inner wall treatment, high roughness, poor solution fluency and easy blockage. In the PEEK needle head in the embodiment 1, the rear end of the solution tube is thick, and the needle head part is provided with a taper, so that the solution flows smoothly; because PEEK mechanical properties is excellent, through the finish machining after handling, the needle point hole roughness reaches 12 grades or more than 0.050 of Ra, has further kept the solution fluency, has prevented to block up.

Under the condition of multiple needles, the maximum solution dosage of a single needle in the spinning production is 5000 mg/h. The stainless steel needle has larger capillary holes (even if the inner diameter of the 30G needle is 0.16mm), when the liquid supply pressure is more than 2Pa, the solution amount is more than 5000mg, and the solution cannot be spun completely, so that overstocking is caused, and the spinning space is polluted; and when low-pressure solution is used for supplying liquid, the blockage of the needle head is increased. When the PEEK needle is adopted, the inner diameter of the needle hole can be 0.06mm, and under the condition of 25Pa solution pressure supply, the liquid amount of a single needle is 5000 mg/h. High-pressure liquid supply can be realized in the production process, long-term continuous work can be kept, and the needle of the equipment is less prone to blockage.

The stainless steel needle has poor insulating property, the field intensity of the needle is mutually influenced, and when the high-voltage power supply operates at 50W power, the electrostatic field voltage of the spinning group is 35 kV. When the PEEK needle is used for spinning, the electrical insulation property of the needle is good, the mutual influence of the needles is small, and when a high-voltage power supply 30W runs, the electrostatic field voltage of a spinning group reaches 44 kV.

Because the PEEK syringe needle is excellent for the electrical insulation performance of stainless steel syringe needle, and the electrostatic energy utilization ratio is higher, and field intensity tractive force is more shallow, and same equipment is under the normal spinning condition, and the PEEK syringe needle can set up more quantity, so production efficiency is higher, and the nanofiber of production is thinner, and empty filtration rate is higher, and the resistance is littleer, and filtration efficiency is higher.

Because relative stainless steel capillary needle PEEK syringe needle tubing is thicker and is provided with the tapering, its thin needle point part is short, so wash more easily than stainless steel long capillary, same solvent same power ultrasonic cleaning, so the PEEK syringe needle has saved the cleaning time, has reduced the washing energy consumption.

The above-mentioned embodiments are merely preferred embodiments for fully illustrating the present invention, and the scope of the present invention is not limited thereto. The equivalent substitution or change made by the technical personnel in the technical field on the basis of the invention is all within the protection scope of the invention. The protection scope of the invention is subject to the claims.