CN116423987A - Array electrofluidic spray head based on independent heating adjustment of each nozzle - Google Patents
Array electrofluidic spray head based on independent heating adjustment of each nozzle Download PDFInfo
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- CN116423987A CN116423987A CN202310212834.8A CN202310212834A CN116423987A CN 116423987 A CN116423987 A CN 116423987A CN 202310212834 A CN202310212834 A CN 202310212834A CN 116423987 A CN116423987 A CN 116423987A
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- 238000010438 heat treatment Methods 0.000 title claims abstract description 103
- 239000007921 spray Substances 0.000 title claims abstract description 55
- 238000007639 printing Methods 0.000 claims abstract description 24
- 230000005684 electric field Effects 0.000 claims abstract description 19
- 238000005507 spraying Methods 0.000 claims abstract description 15
- 239000000758 substrate Substances 0.000 claims abstract description 7
- 230000001105 regulatory effect Effects 0.000 claims abstract description 5
- 239000000463 material Substances 0.000 claims description 15
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 8
- 229910001030 Iron–nickel alloy Inorganic materials 0.000 claims description 6
- RVSGESPTHDDNTH-UHFFFAOYSA-N alumane;tantalum Chemical compound [AlH3].[Ta] RVSGESPTHDDNTH-UHFFFAOYSA-N 0.000 claims description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 4
- MELCCCHYSRGEEL-UHFFFAOYSA-N hafnium diboride Chemical compound [Hf]1B=B1 MELCCCHYSRGEEL-UHFFFAOYSA-N 0.000 claims description 4
- 229910052757 nitrogen Inorganic materials 0.000 claims description 4
- 239000001301 oxygen Substances 0.000 claims description 4
- 229910052760 oxygen Inorganic materials 0.000 claims description 4
- 229910021420 polycrystalline silicon Inorganic materials 0.000 claims description 4
- 229920005591 polysilicon Polymers 0.000 claims description 4
- 239000007772 electrode material Substances 0.000 claims description 2
- 230000017525 heat dissipation Effects 0.000 claims description 2
- 229910001120 nichrome Inorganic materials 0.000 claims description 2
- 238000007641 inkjet printing Methods 0.000 abstract description 9
- 230000001276 controlling effect Effects 0.000 abstract description 6
- 241001391944 Commicarpus scandens Species 0.000 abstract description 3
- 239000000243 solution Substances 0.000 description 32
- 238000002347 injection Methods 0.000 description 7
- 239000007924 injection Substances 0.000 description 7
- 230000009286 beneficial effect Effects 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 5
- 239000007788 liquid Substances 0.000 description 5
- 239000012530 fluid Substances 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 3
- 238000001755 magnetron sputter deposition Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000032683 aging Effects 0.000 description 2
- 230000033228 biological regulation Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 2
- 229910052737 gold Inorganic materials 0.000 description 2
- 239000010931 gold Substances 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 229910000623 nickel–chromium alloy Inorganic materials 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- 238000010146 3D printing Methods 0.000 description 1
- 229920001486 SU-8 photoresist Polymers 0.000 description 1
- 239000004809 Teflon Substances 0.000 description 1
- 229920006362 Teflon® Polymers 0.000 description 1
- -1 acryl Chemical group 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 239000002390 adhesive tape Substances 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000007787 electrohydrodynamic spraying Methods 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 230000005499 meniscus Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000000059 patterning Methods 0.000 description 1
- 238000001259 photo etching Methods 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 238000007740 vapor deposition Methods 0.000 description 1
- 239000012224 working solution Substances 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2/015—Ink jet characterised by the jet generation process
- B41J2/04—Ink jet characterised by the jet generation process generating single droplets or particles on demand
- B41J2/045—Ink jet characterised by the jet generation process generating single droplets or particles on demand by pressure, e.g. electromechanical transducers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2/015—Ink jet characterised by the jet generation process
- B41J2/04—Ink jet characterised by the jet generation process generating single droplets or particles on demand
- B41J2/06—Ink jet characterised by the jet generation process generating single droplets or particles on demand by electric or magnetic field
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2/135—Nozzles
- B41J2/14—Structure thereof only for on-demand ink jet heads
Landscapes
- Particle Formation And Scattering Control In Inkjet Printers (AREA)
Abstract
The invention belongs to the field of ink-jet printing devices, and particularly relates to an arrayed electrofluidic spray head based on independent heating adjustment of all nozzles, which comprises the following components: a plurality of projecting nozzles arranged on the nozzle plate, a plurality of heating electrodes corresponding to the projecting nozzles one by one, a power supply circuit for independently supplying power to each heating electrode, and an ink box communicated with the projecting nozzles; each heating electrode is used for independently heating the corresponding protruding nozzle; the voltage applied to the solution in the cartridge satisfies the following: when the heating electrode does not work, the ink in the ink box is not ejected due to the electric field force between the ink box and the printing substrate; when the power supply circuit supplies power to each heating electrode independently, different power supply voltages generate unequal resistance heat, so that the temperatures of solutions in the protruding nozzles corresponding to the heating electrodes are unequal, and different spraying states are achieved. The invention can avoid the problem that the existing spray head is easy to break down when the spray head is independently controlled to spray by regulating and controlling the electric field.
Description
Technical Field
The invention belongs to the field of ink-jet printing devices, and particularly relates to an arrayed electrofluidic spray head based on independent heating adjustment of all nozzles.
Background
The ink jet printing is used as an additive manufacturing direct writing technology, has the advantages of no need of masks, flexible production, high material utilization rate and the like, and has good application prospects in the fields of printing display, printed circuits, printing solar cells and the like.
At present, the ink jet printing mainly adopts the piezoelectric and thermal bubble technology, bubbles are generated through deformation or heating of a piezoelectric sheet, and ink is extruded out of a nozzle to form ink drops. Both inkjet printing techniques suffer from the disadvantage of being sensitive to ink viscosity, with the smallest drop size being larger than the nozzle diameter, such that the ink viscosity available for printing is limited, while the resolution of printing is limited by the nozzle diameter being difficult to further increase, failing to meet the demands of more material and higher resolution for inkjet printing. The electric fluid jet printing technology uses the electric field force as a main driving force, so that the driving capability of the ink is greatly enhanced, and the high-viscosity ink can be printed; meanwhile, the liquid meniscus is used for locally jetting, so that the size of the generated ink drops can be far smaller than the diameter of the nozzle, and the jet printing resolution can be remarkably improved. The electrofluidic ink-jet printing technology overcomes two defects of the traditional ink-jet printing technology, and has wide application prospect.
Electrofluidic nozzles are critical for achieving electrofluidic inkjet printing. At present, independent controllable spraying of the electrohydrodynamic spraying head is realized by regulating and controlling an electric field, but the electric field regulation and control has the problems of unequal opening voltage of a nozzle, electric field crosstalk and the like. In addition, the electric field regulation and control is mainly realized by an external electrode ring, and jet flow is easy to deflect to the electrode ring during printing, so that the spray head is in fault. For example, chinese patent application CN201410289239.5 proposes a method for realizing independently controllable spray printing of a spray head, but since an extraction electrode is disposed below the spray head, not only is the manufacturing and assembly difficult, but also ink is easily deposited on the extraction electrode in a skewed manner, which causes damage to the spray head. Chinese patent application CN201510299992.7 proposes a micro electrospray chip device, but it cannot realize independent control of the injection state of each nozzle.
Disclosure of Invention
Aiming at the defects and improvement demands of the prior art, the invention provides an arrayed electrofluidic spray head based on independent heating adjustment of each nozzle, and aims to solve the problem that the current electrofluidic spray head is easy to break down when realizing independent controllable spray by adjusting and controlling an electric field.
To achieve the above object, according to one aspect of the present invention, there is provided an arrayed electrofluidic nozzle head independently heated and adjusted based on each nozzle, comprising: a plurality of protruding nozzles arranged on the jet plate in an array, a plurality of heating electrodes corresponding to the protruding nozzles one by one, a power supply circuit for independently supplying power to each heating electrode, and an ink box communicated with the protruding nozzles;
each heating electrode is used for independently heating the corresponding protruding nozzle; the voltage applied to the solution in the cartridge satisfies the following: when the heating electrode does not work, the ink in the ink box is not ejected due to the electric field force between the ink box and the printing substrate; when the power supply circuit supplies power to each heating electrode independently, different power supply voltages generate unequal resistance heat, so that the temperatures of solutions in the protruding nozzles corresponding to the heating electrodes are unequal, and different spraying states are achieved.
The beneficial effects of the invention are as follows: the invention eliminates the existing mechanism of controlling the electric fluid injection through the electrode ring, newly introduces the heating electrode, and respectively adjusts the temperature of each spray hole so as to regulate and control the parameters such as the surface tension, the viscosity, the contact angle and the like of the end solution. When the temperature of the solution is increased, the surface tension and viscosity of the solution are reduced, and the resistance of spraying is reduced; when the resistance is less than the electric field force, the solution will change from not sprayed to sprayed. The voltage applied to the solution in the cartridge satisfies the following: when the heating electrodes do not work, ink in the ink box can not be sprayed due to the electric field force between the ink box and the printing substrate, when the power supply circuit supplies power to each heating electrode independently, different power supply voltages generate unequal resistance heat, so that the temperature of solutions in each nozzle is unequal, and further, the surface tension, the viscosity and the contact angle are unequal, different spraying states are realized, independent control of spray holes is realized, and the problem that the existing electrofluidic spray nozzle is easy to fail when the electric field is regulated and controlled to realize independent controllable spraying can be avoided.
Further, the heating electrode is made of iron-nickel alloy, nickel-chromium alloy, hafnium diboride, polysilicon or tantalum aluminum (oxygen and nitrogen).
The invention has the further beneficial effects that: materials such as iron-nickel alloy, nichrome, hafnium diboride, polysilicon or tantalum aluminum (oxygen, nitrogen) have the characteristic of rapid temperature rise, and can meet the rapid response requirement of the nozzle.
Further, the highest working voltage of the heating electrode is not more than 100V, and the highest working temperature is not more than 200 ℃.
The invention has the further beneficial effects that: the highest working voltage of the heating electrode 3 is not more than 100V, the highest working temperature is not more than 200 ℃, and the advanced aging of the spray head caused by high temperature can be avoided.
Further, the heating electrode is a closed or non-closed annular electrode and surrounds the periphery of the protruding nozzle; or the heating electrode is a film and is attached to the inner wall of the spray hole cavity protruding out of the inner wall of the spray nozzle or above the inner wall of the spray hole cavity;
according to application requirements, the resistance value of the heating electrode is adjusted by changing the resistance material and the resistance geometric dimension.
Further, the power supply circuits are in one-to-one correspondence with the heating electrodes, the power supply circuits are mutually separated, the far end of each power supply circuit is provided with a pin, and the power supply circuits are connected with an external circuit through the pins and the switch so as to independently control whether the heating electrodes work or not.
Further, an insulating layer is provided on the heating electrode and the power supply circuit.
The invention has the further beneficial effects that: the insulating layer covers the heating electrodes and the power supply circuit and is used for isolating external solution and avoiding conduction between the heating electrodes and between the power supply circuits. The insulating layer is made of a material having good insulating properties and heat resistance.
Further, the outer side surface of the insulating layer is designed as a micro corrugated structure.
The invention has the further beneficial effects that: the outside surface of insulating layer can be designed as miniature ripple structure, increases the area of contact with the air, promotes the radiating effect.
The invention also provides a printing system which adopts the arrayed electrofluidic spray head based on independent heating adjustment of each nozzle.
In general, through the above technical solutions conceived by the present invention, the following beneficial effects can be obtained:
the invention eliminates the existing mechanism of controlling the electrofluid injection through the electrode ring, newly introduces the heating electrode, and respectively adjusts the temperature of each spray hole so as to regulate and control the surface tension, viscosity, contact angle and other parameters of the end solution, thereby realizing the independent control of the spray holes and avoiding the problem that the electrofluid spray nozzle is easy to break down when the current electrofluid spray nozzle is independently and controllably injected through regulating and controlling the electric field. The heating electrode is used for heating the end part of the nozzle so as to regulate the surface tension of the Taylor cone liquid level and control the spraying of the liquid level, thereby realizing independent controllable spray printing of each nozzle and having the advantages of low crosstalk, high resolution, low cost and the like.
Drawings
FIG. 1 is a perspective view of an arrayed electrofluidic sprinkler that is independently controllable based on independent heating adjustment of each nozzle provided by an embodiment of the present invention;
FIG. 2 is a cross-sectional view of an arrayed electrofluidic sprinkler that is independently controllable based on independent heating adjustment of each nozzle provided by an embodiment of the present invention;
FIG. 3 is a diagram of another arrangement of heating electrodes for implementing an independently controllable arrayed electrofluidic sprinkler based on independent heating adjustment of each nozzle according to an embodiment of the present invention;
fig. 4 is an independently controllable schematic diagram of an arrayed electrofluidic nozzle for realizing independent control based on independent heating adjustment of each nozzle according to an embodiment of the present invention.
The same reference numbers are used throughout the drawings to reference like elements or structures, wherein:
1 is a jet orifice plate, 2 is a protruding nozzle, 3 is a heating electrode, 4 is a power supply circuit, 5 is an insulating layer, 6 is an ink box and 7 is a substrate.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention. In addition, the technical features of the embodiments of the present invention described below may be combined with each other as long as they do not collide with each other.
Example 1
An arrayed electrofluidic spray head based on independent heating adjustment of each nozzle, as shown in fig. 1 and 2, comprising: an orifice plate 1, a plurality of protruding nozzles 2 arranged in an array on the orifice plate, a plurality of heating electrodes 3, a power supply circuit 4 for supplying power to each heating electrode independently, and an ink cartridge 6 communicating with the plurality of protruding nozzles; the plurality of protruding nozzles are in one-to-one correspondence with the plurality of heating electrodes, and the heating electrodes are positioned at the end parts of the nozzles, which are in contact with the spray holes (actually, the nozzles can also be positioned above, on the side surfaces, etc.); the voltage applied to the solution in the cartridge satisfies the following: when the heating electrode does not work, the ink in the ink box is not ejected due to the electric field force between the ink box and the printing substrate; when the power supply circuit supplies power to each heating electrode independently, different voltages generate unequal resistance heat, so that the temperature of the solution in each nozzle is unequal, and further the surface tension, viscosity and contact angle are unequal, so that different spraying states are realized.
It should be noted that, the upper portion of the ink box 6 is provided with a hole for filling the solution, the bottom of the ink box 6 is provided with a groove communicated with the through hole on the jet plate 1 for supplying the solution, the jet plate 1 is provided with a plurality of through holes and is connected with the hole of the protruding nozzle 2 to form a solution channel, the heating electrode 3 surrounds the protruding nozzle 2 and is directly connected with the power supply circuit 4, the heating electrode 3 is in one-to-one correspondence with the protruding nozzle 2, as the solution resistance changes along with the temperature, the different power supply voltages correspond to the different temperature rises of the protruding nozzle, the temperature rises are different, the spraying states of the electric fluid are different, and the independent control of the spraying states of each nozzle is realized by heating the end part of the nozzle. The voltage of each heating electrode can be independently adjusted. The heating electrode is made of an electrothermal material, and unequal resistance heat is generated by changing a voltage applied to the heating electrode.
Further, the voltage applied by the heating electrode varies with the working solution. Different solutions have different specific heat capacities, and the energy required for raising the same temperature is not equal; meanwhile, the surface tension coefficients and the change rules of the viscosity along with the temperature of different solutions are different. By heating the partial solution at the protruding nozzle 2, the ejection resistance thereof is reduced, and when the ejection resistance is smaller than the electric field force between the ink cartridge and the printing substrate, the solution is ejected, and the nozzle is opened.
The protruding nozzle 2 can concentrate the electric field and reduce the start voltage of the injection. When spray printing is carried out, voltage is firstly applied to the solution in the ink box, so that the tip of the nozzle forms a Taylor cone, and then the heating electrode is electrified, so that the nozzle starts to spray. The starting voltage of the spray head of the embodiment is lower than the starting voltage of the existing control of electric fluid injection through the electrode ring, the heating electrode 3 is used as an auxiliary energy source when the spray head works to control whether ink is injected or not, the function of an ink injection switch is achieved, the working voltage of the spray head can be reduced by 20% -30%, and the requirement on a high-voltage power supply is reduced.
As a preferred embodiment, the heating electrode 3 and the power supply circuit 4 are formed below the orifice plate 1. The processing method is vapor plating or magnetron sputtering, the selected heating electrode material is iron-nickel alloy, and the power supply circuit material is gold.
The material used for the heating electrode 3 should have the characteristic of rapid temperature rise so as to meet the rapid response requirement of the nozzle, so that materials such as iron-nickel alloy, nickel-chromium alloy, hafnium diboride, polysilicon, tantalum aluminum (oxygen, nitrogen) and the like can be selected.
As a preferred embodiment, the highest operating voltage of the heating electrode 3 is not more than 100V, and the highest operating temperature is not more than 200 ℃, so as to avoid the advanced aging of the spray head caused by high temperature.
The heating electrode can be a closed or non-closed annular electrode which surrounds the periphery of the protruding nozzle as a preferred embodiment; or the heating electrode is a film and is attached to the inner wall of the spray hole cavity protruding out of the inner wall of the spray nozzle or above the inner wall of the spray hole cavity, as shown in fig. 3, and the heating electrode is arranged in the flow channel wall; in addition, according to application requirements, the resistance of the heating electrode is adjusted by changing the resistance material and the resistance geometric dimension.
The power supply circuits are in one-to-one correspondence with the heating electrodes, the power supply circuits are mutually separated, the far end of each power supply circuit is provided with a pin, and the power supply circuits are connected with an external circuit through the pins and the switch so as to independently control whether the heating electrodes work or not.
The power supply circuits are mutually separated, and the voltage of each heating electrode can be independently adjusted. And each power supply branch is independently controlled by a switch to independently control the injection of the solution in each protruding nozzle.
As a preferred embodiment, the showerhead further includes an insulating layer disposed over the heater electrode and the power supply circuit.
The insulating layer 5 covers the heating electrode 3 and the power supply circuit 4 to isolate the external solution and avoid conduction between the heating electrodes and between the power supply circuits. The insulating layer is made of a material having good insulating properties and heat resistance.
The insulating layer 5 covers the heating electrode 3 and the power supply circuit 4 to avoid the overflowed solution from conducting the circuits, but leaves the pins of the power supply circuit 4 for connection with an external circuit.
The insulating layer can be used as a preferable implementation mode, and the outer side surface of the insulating layer is designed into a miniature corrugated structure so as to increase the contact area with air and improve the heat dissipation effect.
In order to describe the present embodiment more clearly, the following example will be given:
the heating electrode surrounds the outside of the protruding nozzle 2, the protruding nozzle 2 is prepared by SU-8 photoresist photoetching, the outer diameter of the nozzle is 50 μm, the height is 100 μm, the interval is 300 μm, and the number of the nozzles is 8. The heating electrode 3 is made of iron-nickel alloy material, and is prepared by using a perforated PI adhesive tape as a mask through a magnetron sputtering process, wherein the outer diameter of the heating electrode is 100 mu m, and the thickness of the heating electrode is 200nm. The power supply circuit 4 is also prepared by a magnetron sputtering process, and the material is gold, the width is 40 mu m, and the thickness is 200nm. The insulating layer 5 was prepared by vapor deposition using teflon material. The ink cartridge 6 is prepared by 3D printing using an acryl material.
When the spray head is used for spray printing, the solution uniformly reaches the tips of the nozzles to infiltrate the nozzles. A pulsed voltage is then applied to the solution, and the voltage is less than the firing voltage of the nozzle. And applying a voltage to the heating electrode, and adjusting the voltage to find a voltage value for enabling the nozzle to start spraying. According to the requirement of spray printing, the corresponding nozzles are heated, and then the patterning printing can be carried out by matching with a movable workbench.
When the solution of the nozzle is electrified and the heating electrode is not electrified, the electric field force is smaller than the spraying resistance, and the liquid level sags but does not spray; after the heating electrode is also electrified, the temperature of the solution is increased, the surface tension coefficient is reduced, the spraying resistance is reduced, and after the electric field force is larger than the spraying resistance, the liquid level is sprayed. As shown in fig. 4, the individual controllability of the arrayed spray heads can be achieved by energizing the heating electrodes of the specific nozzles. (in FIG. 4, the heating electrodes of the nozzles 2, 3, 6, and 7 are energized from the left, and the other nozzles are not energized)
For ethylene glycol ink, the turn-on voltage of the nozzle at room temperature of 25 ℃ is 1200V. When the spray head is used, the proper voltage value of the heating electrode is required to be searched by pre-spray printing. Applying 1000V voltage to the whole solution, electrifying a specific heating electrode, gradually increasing the voltage until the spray head sprays stably, and recording the voltage value. The voltage value is used as the operating voltage of the heating electrode, and the main printing is started. The operating voltage of the heating electrode can be varied if the jet size is to be adjusted.
Example two
A printing system employs an arrayed electrofluidic spray head based on independent thermal adjustment of each nozzle as described above.
The related technical solution is the same as the first embodiment, and will not be described herein.
It will be readily appreciated by those skilled in the art that the foregoing description is merely a preferred embodiment of the invention and is not intended to limit the invention, but any modifications, equivalents, improvements or alternatives falling within the spirit and principles of the invention are intended to be included within the scope of the invention.
Claims (8)
1. An arrayed electrofluidic spray head based on independent heating adjustment of each nozzle, comprising: a plurality of protruding nozzles arranged on the jet plate in an array, a plurality of heating electrodes corresponding to the protruding nozzles one by one, a power supply circuit for independently supplying power to each heating electrode, and an ink box communicated with the protruding nozzles;
each heating electrode is used for independently heating the corresponding protruding nozzle; the voltage applied to the solution in the cartridge satisfies the following: when the heating electrode does not work, the ink in the ink box is not ejected due to the electric field force between the ink box and the printing substrate; when the power supply circuit supplies power to each heating electrode independently, different power supply voltages generate unequal resistance heat, so that the temperatures of solutions in the protruding nozzles corresponding to the heating electrodes are unequal, and different spraying states are achieved.
2. The arrayed electrofluidic nozzle of claim 1, wherein the heating electrode material is iron-nickel alloy, nichrome, hafnium diboride, polysilicon or tantalum aluminum (oxygen, nitrogen).
3. The arrayed electrofluidic nozzle of claim 1, wherein the heating electrode has a maximum operating voltage of no more than 100V and a maximum operating temperature of no more than 200 ℃.
4. The arrayed electrofluidic nozzle of claim 1, wherein the heating electrode is a closed or non-closed ring electrode surrounding the periphery of the protruding nozzle; or the heating electrode is a film and is attached to the inner wall of the spray hole cavity protruding out of the inner wall of the spray nozzle or above the inner wall of the spray hole cavity;
according to application requirements, the resistance value of the heating electrode is adjusted by changing the resistance material and the resistance geometric dimension.
5. The arrayed electrofluidic sprinkler of claim 1, wherein the plurality of power supply circuits are in one-to-one correspondence with the heating electrodes, the power supply circuits are spaced apart from each other, and a distal end of each power supply circuit is provided with a pin, and is connected with an external circuit through the pin and a switch to independently control whether the heating electrode operates.
6. The arrayed electrofluidic spray head of claim 1, further comprising an insulating layer disposed over the heater electrode and the power supply circuit.
7. The arrayed electrofluidic nozzle of claim 6, wherein the insulating layer is designed to enhance heat dissipation and the outer surface is designed as a micro-corrugated structure.
8. A printing system employing an arrayed electrofluidic spray head as claimed in any one of claims 1 to 7 which is independently thermally regulated based on each nozzle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310212834.8A CN116423987A (en) | 2023-03-06 | 2023-03-06 | Array electrofluidic spray head based on independent heating adjustment of each nozzle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310212834.8A CN116423987A (en) | 2023-03-06 | 2023-03-06 | Array electrofluidic spray head based on independent heating adjustment of each nozzle |
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| Publication Number | Publication Date |
|---|---|
| CN116423987A true CN116423987A (en) | 2023-07-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310212834.8A Pending CN116423987A (en) | 2023-03-06 | 2023-03-06 | Array electrofluidic spray head based on independent heating adjustment of each nozzle |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117283991A (en) * | 2023-10-30 | 2023-12-26 | 武汉国创科光电装备有限公司 | Electrofluidic array spray head for printing display device and spray printing equipment |
-
2023
- 2023-03-06 CN CN202310212834.8A patent/CN116423987A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117283991A (en) * | 2023-10-30 | 2023-12-26 | 武汉国创科光电装备有限公司 | Electrofluidic array spray head for printing display device and spray printing equipment |
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