CN103741232A - Ionic air knife used for electrostatic spinning and control method thereof - Google Patents
Ionic air knife used for electrostatic spinning and control method thereof Download PDFInfo
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- CN103741232A CN103741232A CN201410035758.9A CN201410035758A CN103741232A CN 103741232 A CN103741232 A CN 103741232A CN 201410035758 A CN201410035758 A CN 201410035758A CN 103741232 A CN103741232 A CN 103741232A
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Abstract
The invention provides an ionic air knife used for electrostatic spinning. The ionic air knife is used for performing static neutralization on a membrane surface with the accumulation of static electricity when a membrane is formed by electrostatic spinning. The ionic air knife comprises a discharge electrode, an input port and a slit, wherein the discharge electrode is formed by arranging a plurality of metal discharging needles and is used for ionizing air adjacent to the needle point after static high voltage is accessed; the input port is used for inputting compressed air; and the slit is used for blowing out the compressed air, so as to form laminar air, and is used for bringing ions in areas adjacent to the discharging needle points to the membrane surface with the accumulation of the static electricity. The invention further provides a control method of the ionic air knife used for the electrostatic spinning, according to the ionic air knife, the air is ionized by the discharging electrode of the ionic air knife, and the laminar air is formed by the compressed air, so that ions are blown to the membrane surface so as to be used for safely and controllably neutralizing the accumulation of the static electricity in an accurate direction.
Description
Technical field
The present invention relates to electrostatic spinning process, relate in particular to a kind of ion air knife and control method thereof that is applied to electrostatic spinning.
Background technology
The material of occurring in nature, can obtain or lose via certain process electric charge (as friction or electrification by induction), and this class electric charge is called static.When these positive charges or negative electrical charge build up, can produce potential difference with surrounding environment, if electric charge is created in via discharge path between different potentials and transfers phenomenon, claim that this is static discharge phenomenon, referred to as ESD(ElectroStatic Discharge).In industrial processes as all occurred in film production, packaging process, paper production and chemical fibre cloth production process.Particularly semi-conductor industry, prevents that ESD is even more important.In non-semiconductor industrial production, conventionally the method that prevents ESD is appropriate change and adjusting air humidity, the important method of another one is in the space around product, to build a large amount of positive and negative ion freely, with the electrostatic charge on neutralized product surface, makes product surface finally be electroneutral.
In electrostatic spinning process, Polymer Solution is under the effect of high-voltage electrostatic field, first form " taylor cone ", owing to being with upper electric charge on macromolecular chain, macromolecular chain in taylor cone in Polymer Solution is constantly elongated it by the electrostatic repulsion of electric charge, meanwhile solvent constantly volatilizees, and finally at collecting board (utmost point), forms diameter fiber of (tens to hundreds of nanometer) below micron.In actual extensive electrostatic spinning process, nanofiber is normally deposited on as on the liner of enhance mechanical strength, in the application of water filtration processing and air filtration processing, the nonwoven fabric that liner normally adopts conventional method to produce as melting air blowing spinning etc., normally nonconducting.On the other hand, for the macromolecular material of electrostatic spinning, be all also electric insulation conventionally.Due in actual production process, it is (relevant with concrete application that nanofiber need to accumulate certain thickness, air filtration is about several microns, water filtration is processed needs tens to hundreds of micron) therefore, industrial nano fibrous membrane is actually and is formed by stacking by multi-layer nano fiber.
Because selected macromolecular material is non-conductive, and poor electric conductivity at the bottom of nonwoven interlining, therefore in the extensive electrostatic spinning production process of many shower nozzles, the electric charge being deposited in the nanofiber of collector can not be neutralized effectively, so just causes accumulation of static electricity.Accumulation of static electricity causes the consequence of following two aspects:
1, the electric-field intensity in electrostatic spinning is to be established by the voltage between spinning head and collector, conventionally depending on other conditions by several kilovolts to several ten thousand volts.But the electric-field intensity of the dynamic process of electrostatic spinning is to be established by spinning head and the electrical potential difference of the topsheet surface of the film that has deposited nanofiber.If suppose, the two voltage difference is (U1-U0), and wherein U1 is spinning head voltage (gesture), and U0 is film surface voltage (gesture); Spinning head is D to the distance of collector, electric field strength E so=(U1-U0)/D.Due to charge accumulated, the electromotive force on film surface (U0) can increase gradually, and therefore, the electric-field intensity in dynamic process will weaken gradually.Affect the most at last electrostatic spinning process.
2, because last film forming is to be formed by stacking by multi-layer nano fiber, the conjugation that surface charge accumulation can produce between layers dies down, and (on thickness) density of film forming is reduced.When serious, fluffy structure will be formed.This is totally unfavorable for the application of water filtration processing.
Summary of the invention
In view of this, the invention provides a kind of ion air knife and control method thereof that is applied to electrostatic spinning, for and spinning process in the static that produces.
Ion air knife for electrostatic spinning of the present invention, for static neutralization being carried out in the film surface with accumulation of static electricity when electrostatic spinning film forming, described ion air knife comprises: discharge electrode, is formed by multiple metal discharge faller gill row, for connecting after electrostatic high-pressure, by near air ionization needle point; Input port, for input compressed-air; Slit, for blowing out described compressed air, to form laminar winds, for having the film surface of accumulation of static electricity described in taking at the ion of described spray point needle point near zone.
Preferably, also comprise control module, for air mass flow and the described slit of the electrostatic high-pressure by described discharge electrode, described input port, apart from the distance on described film surface, regulate the ion concentration that arrives described film surface.
Preferably, described electrostatic high-pressure is at 5k-50kv, and the air mass flow of described input port is at 500-3000m
3/ h, the described film surface distance of described slit distance is at 5-40cm.
Preferably, described compressed-air actuated air pressure is 3-5 atmospheric pressure.
Preferably, be positioned in the space between electrostatic spinning module.
The control method of the ion air knife for electrostatic spinning of the present invention, comprises the steps: discharge electrode to connect electrostatic high-pressure, makes metal discharge pin wherein by near air ionization; By input port input compressed-air; By slit, blow out described compressed air, to form laminar winds, for the film surface of accumulation of static electricity will be taken at the ion of described metal discharge pin needle point near zone.
Preferably, by air mass flow and the described slit of controlling the electrostatic high-pressure of described discharge electrode, described input port, apart from the distance on described film surface, regulate the ion concentration that arrives described film surface.
Preferably, described electrostatic high-pressure is at 5k-50kv, and the air mass flow of described input port is at 500-3000m
3/ h, described slit apart from the distance on film surface at 5-40cm.
Preferably, described compressed-air actuated air pressure is 3-5 atmospheric pressure.
The present invention can be by ion air knife discharge electrode by air ionization, and by compressed air forms laminar winds by ion blow to described film surface with in and accumulation of static electricity, direction is accurate, and safe controlled.
Accompanying drawing explanation
Fig. 1 is the front view for the ion air knife of electrostatic spinning in the present invention.
Fig. 2 is the control method schematic flow sheet for the ion air knife of electrostatic spinning in the present invention.
The specific embodiment
In order to make object of the present invention, technical scheme and advantage more clear, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.
Embodiment 1
Refer to Fig. 1, be depicted as the front view of intermediate ion air knife of the present invention.Described ion air knife is positioned in the space between electrostatic spinning module, for static neutralization being carried out in the film surface with accumulation of static electricity when the electrostatic spinning film forming.
Described ion air knife, comprises discharge electrode, input port 1, slit 3 and control module (not indicating).
Wherein, discharge electrode, is arranged and is formed by multiple metal discharge pins 2, for connecting after electrostatic high-pressure, discharge, and by near air ionization needle point.Particularly, described spray point 2 can be arranged according to certain geometrical rule or density.And described electrostatic high-pressure can reach 5K conventionally to 50KV.
Input port 1, for input compressed-air, and described compressed-air actuated flow and air pressure is controlled, can by control module, be adjusted according to reality.Conventionally, described compressed-air actuated air pressure is 3-5 atmospheric pressure, and this atmospheric pressure value belongs to low pressure, normal pressure in compressed air, and common air compressor just can reach, and can reduce equipment investment on the one hand, reduces equipment damage; Can reduce on the other hand energy consumption.
Control module, by the air mass flow of the electrostatic high-pressure of described discharge electrode, described input port and the distance on described slit distance described film surface, regulates the ion concentration that arrives described film surface.Wherein, described electrostatic high-pressure is conventionally between 5k-50kv, and the air mass flow of described input port is conventionally at 500-3000m
3between/h, described slit is being selected between 15-100cm or between 5-40cm conventionally apart from the distance on described film surface.
Above-mentioned number range advantage is in actual applications: in and Static Spinning film surface charge in can not interfere with steadily carrying out of electrostatic spinning.High voltage, high gas flow and little distance make neutralization better, but this also can be to the disturbance that produces of Static Spinning, so the adjustment of above-mentioned technological parameter is the range of balance between electrostatic spinning and neutralization.
Embodiment 2
Refer to Fig. 2, be depicted as in the present invention the control method for the ion air knife of electrostatic spinning, mainly comprise the steps:
In step S201, discharge electrode is connected to electrostatic high-pressure, make metal discharge pin by near the air ionization it.Particularly, described spray point can be arranged according to certain geometrical rule or density.And described electrostatic high-pressure is conventionally between 5k-50kv.
In step S202, by input port input compressed-air.And described compressed-air actuated flow and air pressure are controlled, can by control module, be adjusted according to the actual requirements.
Conventionally, the air mass flow of described input port is conventionally at 500-3000m
3between/h.Described compressed-air actuated air pressure is 3-5 atmospheric pressure, and this atmospheric pressure value belongs to low pressure, normal pressure in compressed air, and common air compressor just can reach, and can reduce equipment investment on the one hand, reduces equipment damage; Can reduce on the other hand energy consumption.
In step S203, by slit, blow out described compressed air, to form laminar winds, for the film surface of accumulation of static electricity will be taken at the ion of described spray point needle point near zone.Particularly, slit should be in the upstream end of discharge electrode, and, away from the one end on film surface, the laminar winds therefore forming can be blown the ion of spray point ionization to described film surface direction.
In step S204, by the air mass flow of electrostatic high-pressure, described input port and the distance on described slit distance described film surface, regulate the ion concentration that arrives described film surface.Wherein, described electrostatic high-pressure is conventionally between 5k-50kv, and the gas flow of described input port is conventionally at 500-3000m
3between/h, described slit is being selected between 15-100cm or between 5-40cm conventionally apart from described film surface distance.
It should be noted that: above-mentioned steps there is no sequencing, can be in the use procedure of ion air knife, by the demand to ion concentration, the air mass flow to above-mentioned electrostatic high-pressure, described input port and described slit regulate apart from the distance on described film surface.
Experimental data 1
In the process of electrostatic spinning, in and the accumulation of static electricity on film surface, adopt ion air knife to control, the spinning head ejection of electrostatic spinning be polyvinyl alcohol/dimethyl sulphoxide solution of 10wt%.Specific experiment parameter is as follows: the voltage (being equal to electrostatic high-pressure) of metal discharge pin is 5kv, and compressed-air actuated air pressure is 3 atmospheric pressure, and slit is 20cm apart from described film surface, and the air mass flow of input port is 1000m
3/ h.When adopting after above-mentioned ion air knife, electrostatic spinning machine can move continuously 48 hours and not occur the situation that spinning cannot be carried out; And before using ion air knife, the every operation of electrostatic spinning machine just cannot continue stably to work for 3 hours.
Experimental data 2
In the process of electrostatic spinning, in and the accumulation of static electricity on film surface, adopt ion air knife to control, the spinning head ejection of electrostatic spinning be PE melt, melt temperature is 250 ℃.Specific experiment parameter is as follows: the voltage (being equal to electrostatic high-pressure) of metal discharge pin is 30kv, and compressed-air actuated air pressure is 5 atmospheric pressure, and described slit is 40cm apart from described film surface, and the air mass flow of input port is 2000m
3/ h.When adopting after above-mentioned ion air knife, electrostatic spinning machine can move continuously 48 hours and not occur the situation that spinning cannot be carried out; And before using ion air knife, the every operation of electrostatic spinning machine just cannot continue stably to work for 2 hours.
The present invention can be by ion air knife discharge electrode by air ionization, and by compressed air forms laminar winds by ion blow to described film surface with in and accumulation of static electricity, direction is accurate, and safe controlled.
The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (9)
1. for the ion air knife of electrostatic spinning, for static neutralization being carried out in the film surface with accumulation of static electricity when the electrostatic spinning film forming, it is characterized in that, described ion air knife comprises:
Discharge electrode, is formed by multiple metal discharge faller gill row, for connecting after electrostatic high-pressure, by near air ionization needle point;
Input port, for input compressed-air;
Slit, for blowing out described compressed air, to form laminar winds, for having the film surface of accumulation of static electricity described in taking at the ion of described spray point needle point near zone.
2. the ion air knife for electrostatic spinning as claimed in claim 1, it is characterized in that, also comprise control module, for air mass flow and the described slit of the electrostatic high-pressure by described discharge electrode, described input port, apart from the distance on described film surface, regulate the ion concentration that arrives described film surface.
3. the ion air knife for electrostatic spinning as claimed in claim 2, is characterized in that, described electrostatic high-pressure is at 5k-50kv, and the air mass flow of described input port is at 500-3000m
3/ h, the described film surface distance of described slit distance is at 5-40cm.
4. the ion air knife for electrostatic spinning as claimed in claim 1, is characterized in that, described compressed-air actuated air pressure is 3-5 atmospheric pressure.
5. the ion air knife for electrostatic spinning as claimed in claim 1, is characterized in that, is positioned in the space between electrostatic spinning module.
6. for a control method for the ion air knife of electrostatic spinning, it is characterized in that, comprise the steps:
Discharge electrode is connected to electrostatic high-pressure, make metal discharge pin wherein by near air ionization;
By input port input compressed-air;
By slit, blow out described compressed air, to form laminar winds, for the film surface of accumulation of static electricity will be taken at the ion of described metal discharge pin needle point near zone.
7. the control method of the ion air knife for electrostatic spinning as claimed in claim 6, it is characterized in that, by air mass flow and the described slit of controlling the electrostatic high-pressure of described discharge electrode, described input port, apart from the distance on described film surface, regulate the ion concentration that arrives described film surface.
8. the control method of the ion air knife for electrostatic spinning as claimed in claim 7, is characterized in that, described electrostatic high-pressure is at 5k-50kv, and the air mass flow of described input port is at 500-3000m
3/ h, the distance on described slit distance described film surface is at 5-40cm.
9. the control method of the ion air knife for electrostatic spinning as claimed in claim 6, is characterized in that, described compressed-air actuated air pressure is 3-5 atmospheric pressure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410035758.9A CN103741232B (en) | 2013-01-30 | 2014-01-24 | For ion air knife and the control method thereof of electrostatic spinning |
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201310034493 CN103060934A (en) | 2013-01-30 | 2013-01-30 | Ion wind control method for electrostatic spinning |
| CN2013100344936 | 2013-01-30 | ||
| CN201310034493.6 | 2013-01-30 | ||
| CN201410035758.9A CN103741232B (en) | 2013-01-30 | 2014-01-24 | For ion air knife and the control method thereof of electrostatic spinning |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103741232A true CN103741232A (en) | 2014-04-23 |
| CN103741232B CN103741232B (en) | 2016-05-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201310034493 Pending CN103060934A (en) | 2013-01-30 | 2013-01-30 | Ion wind control method for electrostatic spinning |
| CN201410035758.9A Expired - Fee Related CN103741232B (en) | 2013-01-30 | 2014-01-24 | For ion air knife and the control method thereof of electrostatic spinning |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201310034493 Pending CN103060934A (en) | 2013-01-30 | 2013-01-30 | Ion wind control method for electrostatic spinning |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104452108A (en) * | 2014-11-10 | 2015-03-25 | 厦门大学 | Composite polarized fiber membrane manufacturing device |
| TWI655881B (en) * | 2014-11-10 | 2019-04-01 | 美商伊利諾工具工程公司 | Balanced barrier discharge neutralization in a variable pressure environment |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105063774B (en) * | 2015-09-01 | 2017-08-11 | 厦门理工学院 | Electrostatic spinning apparatus and its electrospinning process |
| CN107541798B (en) * | 2017-10-17 | 2023-05-26 | 北京化工大学 | Device for eliminating electrostatic influence in electrospinning direct writing |
| CN108547006A (en) * | 2018-04-24 | 2018-09-18 | 胡权 | A kind of electrostatic spinning reception device and its electrospinning process |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1749449A (en) * | 2004-09-09 | 2006-03-22 | 朱鹏年 | Apparatus for electro-blowing or blowing-assisted electro-spinning technology and process for post treatment of electrospun or electroblown membranes |
| JP4312090B2 (en) * | 2004-03-18 | 2009-08-12 | 日本バイリーン株式会社 | Method for manufacturing fiber assembly and apparatus for manufacturing fiber assembly by electrostatic spinning |
| CN202310262U (en) * | 2011-09-29 | 2012-07-04 | 越扬科技股份有限公司 | Ion wind blade structure |
| CN202353910U (en) * | 2011-11-30 | 2012-07-25 | 亚太纸业（广东）有限公司 | Non-contact static electricity removal device for copy paper |
-
2013
- 2013-01-30 CN CN 201310034493 patent/CN103060934A/en active Pending
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2014
- 2014-01-24 CN CN201410035758.9A patent/CN103741232B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4312090B2 (en) * | 2004-03-18 | 2009-08-12 | 日本バイリーン株式会社 | Method for manufacturing fiber assembly and apparatus for manufacturing fiber assembly by electrostatic spinning |
| CN1749449A (en) * | 2004-09-09 | 2006-03-22 | 朱鹏年 | Apparatus for electro-blowing or blowing-assisted electro-spinning technology and process for post treatment of electrospun or electroblown membranes |
| CN202310262U (en) * | 2011-09-29 | 2012-07-04 | 越扬科技股份有限公司 | Ion wind blade structure |
| CN202353910U (en) * | 2011-11-30 | 2012-07-25 | 亚太纸业（广东）有限公司 | Non-contact static electricity removal device for copy paper |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104452108A (en) * | 2014-11-10 | 2015-03-25 | 厦门大学 | Composite polarized fiber membrane manufacturing device |
| CN104452108B (en) * | 2014-11-10 | 2016-07-06 | 厦门大学 | A kind of compound polarized fibers film manufacturing device |
| TWI655881B (en) * | 2014-11-10 | 2019-04-01 | 美商伊利諾工具工程公司 | Balanced barrier discharge neutralization in a variable pressure environment |
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| Publication number | Publication date |
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| CN103060934A (en) | 2013-04-24 |
| CN103741232B (en) | 2016-05-11 |
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