CN112644178A

CN112644178A - In-line electrofluid printing nozzle capable of inhibiting jet flow interference and printing method

Info

Publication number: CN112644178A
Application number: CN202011528480.0A
Authority: CN
Inventors: 潘艳桥; 郑朋义; 曾良才
Original assignee: Wuhan University of Science and Engineering WUSE
Current assignee: Wuhan University of Science and Engineering WUSE
Priority date: 2020-12-22
Filing date: 2020-12-22
Publication date: 2021-04-13
Anticipated expiration: 2040-12-22
Also published as: CN112644178B

Abstract

The invention discloses an in-line electrofluid printing nozzle capable of inhibiting jet interference and a printing method, comprising a closable ink box for containing conductive printing solution, wherein a voltage input connecting piece is connected with the ink box; a support main body which is positioned below the ink box and supports the ink box main body; at least one nozzle assembly fixed on the support body in a linear array and forming a conical jet flow below the support body; a grounded substrate spaced below the nozzle assembly, and a ring of guide electrodes suspended between the substrate and the distal end of the nozzle assembly. Can avoid the electrostatic interference who easily exists between a plurality of nozzle efflux and the efflux for the pattern size of printing on the base plate is littleer, the precision is higher, can show improvement printing efficiency simultaneously.

Description

In-line electrofluid printing nozzle capable of inhibiting jet flow interference and printing method

Technical Field

The invention relates to an electrofluid printing technology, in particular to an inline electrofluid printing nozzle capable of inhibiting jet interference and a printing method.

Background

Since the 70 s of the last century, the jet printing technology gradually entered the human vision and changed the way of publishing and printing. Inkjet printing is a contactless, direct fabrication technique that does not require a stencil. Conventional ink jet printing can be divided into drop-on-demand printing and continuous printing, and typical drop-on-demand printing methods include thermal bubble jet printing, piezoelectric jet printing, and aerosol jet printing. The traditional spray printing process forms liquid drops in a pushing mode, the pushing force is limited generally, high-viscosity polymer solution cannot be compatible generally, and high-resolution printing is difficult to realize. Different from the traditional ink-jet printing mode, the electrohydrodynamic jet printing prepares the micro-nano structure on the substrate in a pulling mode by means of electric field force, has the advantages of higher printing resolution, printing size generally smaller than the size of a nozzle, wide range of printing solution, difficulty in blocking the nozzle and the like compared with the traditional ink-jet printing, and can be applied to a plurality of fields.

The electrofluid spray printing technology utilizes an electrofluid dynamics mechanism, liquid drops at the tail ends of nozzles can form a meniscus under the action of an electric field force, when the local electric field force at the tip exceeds the surface tension of the ink drops, the meniscus can gradually become a Taylor cone shape, and then jet emergent flow is sprayed for jet printing manufacturing.

The jet printing head is used as the core of the electrofluid jet printing system and has direct influence on the working performance of the electrofluid jet printing system. The design, manufacture and control of the spray are of interest to a wide range of scholars and research institutions. The in-line type electrofluid spray head can effectively improve the spray printing efficiency relative to a single-nozzle spray head. However, because of the multiple nozzles, electrostatic interference is liable to exist between the jets during printing. How to effectively promote the printing efficiency of the electrofluid, and simultaneously, the accuracy of jet flow positioning is also ensured, which is a difficult problem in the field. At present, how to overcome the interference between the jet flows is still in a primary research stage. Chinese patent 201611126421 proposes an airflow-assisted method to improve the positioning, which has the following advantages: 1. the spray head is integrated with the grounding electrode ring, and the grounding electrode originally applied to the substrate is integrated into the spray head, so that the optional range of the collecting substrate is expanded, the application range and the flexibility thereof are improved, and the printing on a curved surface and an insulating substrate is facilitated; 2. and an airflow auxiliary mode is adopted, and the constraint force of the airflow is utilized to overcome the radial component force pointing to the grounding electrode ring, so that the jet flow is prevented from being sprayed onto the grounding electrode ring. However, in practical application, the spray head has the following defects: the invention aims at the printing head with a single nozzle, and meanwhile, auxiliary airflow in the nozzle structure enters the air chamber from a single side, so that the non-uniformity of the airflow around the cone jet flow is caused, and the positioning accuracy of jet flow printing is influenced.

Chinese patent 2018115822806 discloses placing an electrostatic lens directly under a needle-tip type nozzle, and using the electrostatic focusing effect of the electrostatic lens, so as to realize accurate spraying of the solution passing through the needle tip. The electrostatic lens and the base are grounded, and the jet flow is easy to generate satellite droplets in the flying process and fly to the electrostatic lens. After the electric field is gathered to a certain degree, the electric field distribution in the space is influenced again, and finally the jet flow deflection problem is easily caused, and the printing positioning precision is influenced.

Disclosure of Invention

In view of the above-mentioned drawbacks of the prior art, the present invention provides an in-line electrofluid printing head and a printing method capable of suppressing jet interference, which can avoid electrostatic interference easily existing between jets of a plurality of nozzles, so that the size of a pattern printed on a substrate is smaller, the accuracy is higher, and the printing efficiency can be significantly improved.

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

an inline electrofluid printing head that suppresses jet interference, comprising:

a closable cartridge for containing a conductive printing solution, a voltage input connection (700) connected to the cartridge; the ink cartridge includes an ink cartridge top cover (100) and an ink cartridge main body (200) snapably connected;

a support body (300) which is positioned below the ink cartridge and supports the ink cartridge main body (200);

at least one nozzle assembly (400) fixed to the support body (300) in a linear array and forming a conical jet below the support body (300);

a grounded substrate (600) spaced below the nozzle assembly (400), and a guide electrode ring (500) suspended between the substrate (600) and the end of the nozzle assembly (400).

Furthermore, an independent guide electrode ring (500) is correspondingly arranged below each nozzle assembly (400), and a plurality of guide electrode rings (500) are consistent with the corresponding nozzle assemblies (400) above and are arranged in a linear array mode.

Furthermore, a plurality of identical nozzle assemblies (400) are arranged on the support main body (300) in a linear array type at intervals, two nozzle assemblies (400) positioned at two ends of a straight line are blocked by plugs in an ink box area to prevent printing solution from flowing in, the plugs are set to be capable of being connected with alternating voltage through the voltage input connecting piece (700), and each nozzle assembly (400) is set to be capable of forming a gradient electric field vertically downwards with the guide electrode ring (500) and the grounding substrate (600) when the alternating voltage is introduced.

Further, a plurality of rows of the linear array type nozzle assemblies (400) are arranged in parallel on the support body (300).

Further, the nozzle assemblies (400) in each row are arranged in a staggered manner.

Furthermore, a liquid inlet hole is formed in the ink box top cover (100), and a solution hole channel butted with the center of the liquid inlet hole channel of the nozzle assembly (400) is formed in the bottom plate of the ink box main body (200).

Furthermore, the nozzle assembly (400) is cylindrical and comprises a cylindrical nozzle needle (410) arranged in a cylindrical shell, an annular buffer air chamber arranged at the periphery of the nozzle needle (410) and positioned in a closed area between the nozzle needle (410) and the shell, two symmetrical air holes (420) formed in two side walls of the shell and respectively communicated with the annular buffer air chamber, and an air hole channel element (430) which is respectively communicated with the bottom of the buffer air chamber and is positioned below the symmetrical air holes (420) and provided with an annular array air hole channel; two sides of the support main body (300) are correspondingly communicated with symmetrical air holes (420) of the nozzle assembly (400) positioned in the middle of a straight line to form linear array type air inlet channels (403); the height positions of the air inlet flow channels (403) on the two sides are the same; two nozzle assemblies (400) at either end of the line are not provided with inlet flow.

Further, the air hole channel element (430) is provided with a plurality of annular arrays of air hole channels, preferably 3-8 air hole channels; the top of each air hole channel is communicated with the buffer air chamber, the bottom of each air hole channel is a through hole, and the air hole channels are arranged to guide the air flow of the buffer air chamber to downwards form auxiliary air to uniformly surround the conical jet flow at the tail end of the nozzle assembly.

A printing method is characterized in that the jet interference suppressible electrofluid ink-jet printing head is adopted, and after printing solution enters a nozzle assembly (400), all the nozzle assemblies (400) are connected with the same periodic pulse alternating voltage; all the guide electrode rings (500) are connected with periodic pulse alternating current voltage;

the nozzle assembly (400) positioned in the middle of the straight line is connected with periodic pulse alternating voltage through a voltage input connecting piece (700) and printing solution, and the two nozzle assemblies (400) at the two ends of the straight line are connected with the periodic pulse alternating voltage through plugs; each nozzle assembly (400) forms a gradient electric field which vertically downwards with the guide electrode ring (500) and the grounding substrate (600) when an alternating voltage is introduced; the printing solution enters the nozzle assembly (400) in the middle of the line, and under the action of pneumatic back pressure and alternating voltage connected into the nozzle assembly, a charged ink column is formed downwards, and the charged ink column is jetted from the tail end of the nozzle to form a conical jet flow.

Furthermore, the frequency of the periodic pulse alternating current voltage connected into the guide electrode ring (500) is consistent with the periodic pulse alternating current voltage connected into the nozzle component (400), and the absolute value of the amplitude of the voltage connected into the guide electrode ring (500) is always smaller than that of the voltage connected into the nozzle component (400).

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

the nozzle is internally provided with a buffer air chamber, a plurality of annular array holes communicated with the buffer air chamber are formed below the buffer air chamber, airflow applied after airflow enters an annular array air duct surrounds the periphery of the cone jet flow, and jet flow deflection of the cone jet flow of the nozzle assembly due to the electric repulsion action of the adjacent nozzle assemblies is reduced. And the auxiliary air current that evenly surrounds around the awl efflux has tensile effect to the efflux for the pattern size of printing on the base plate is littleer, and further, the auxiliary air current has accelerated the evaporation of efflux solution solvent and has made the solution of printing on the base plate can not take place to bond, makes the pattern precision of printing on the base plate higher.

Two nozzle assemblies on the outermost side of the in-line nozzle are blocked by plugs with the ink box main body, so that printing solution is prevented from flowing in, and electrostatic voltage is connected in through a voltage input connecting piece.

A guide electrode ring is arranged right below the nozzle assembly, the nozzle assembly connected with the alternating voltage, the guide electrode ring and the grounded substrate form a gradient electric field, and cone jet flow is guided to be accurately printed on the substrate under the action of electric field force. All nozzles in the straight-line type are connected with the same periodic pulse alternating voltage, and the ink drop being printed can be neutralized and does not show electricity with the previous jet ink drop after being deposited on the substrate, so that the subsequent jet can not be interfered.

Therefore, the efficient and accurate jet flow is realized through the technical scheme, the electrofluid nozzle can realize accurate printing on a planar substrate under the dual functions of uniform auxiliary air flow and a guide electrode ring, and meanwhile, the printing efficiency is improved through in-line multi-nozzle printing.

Reference numerals

Fig. 1 is a schematic diagram (with droplets) of the structure of an inline electrofluid printing head capable of suppressing jet interference according to the present invention.

Fig. 2 is a perspective view (partially cut away) of an inline electrofluid printing head with suppressed jet disturbance according to the present invention.

Fig. 3 is a front view of an inline electrofluid printing head that suppresses jet interference according to the present invention.

Fig. 4 is a side view (cross-sectional view) of an inline electrofluidic print head of the present invention that suppresses jet interference.

Fig. 5 is a schematic view of a nozzle assembly 400 according to the present invention.

FIG. 6 is a schematic cross-sectional view of a nozzle component of the present invention.

FIG. 7 is a schematic illustration of the operation of the present invention without the auxiliary nozzle assembly installed.

Fig. 8 is an operational view of the present invention after installation of the auxiliary nozzle assembly.

Figure 9 is a graph of the periodically pulsed ac voltage of the access nozzle assembly 400 and the pilot electrode ring 500 of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations. The present invention is described in detail with an embodiment in which 5 print nozzle assemblies 401 and two auxiliary nozzle assemblies 402 are arranged in line, and 5 sets of 10 holes are symmetrically formed on both sides of the support body as air inlet channels 403.

Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

In the description of the present application, it is further noted that, unless expressly stated or limited otherwise, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art. In the drawings, like reference numerals refer to like parts throughout the several views.

Referring to fig. 1 to 6, an inline electrofluid printing head capable of suppressing jet interference according to the present invention includes a cartridge body top cover 100, a cartridge body 200, a support body 300, a nozzle assembly 400, a guide electrode ring 500, a substrate 600, and a voltage input connector 700. The nozzle assembly 400 includes five nozzle assemblies 401 to be printed disposed in the middle, and two auxiliary nozzle assemblies 402 connected to the cartridge body 200 with plugs at the outermost sides.

Five liquid flow pore channels are arranged at the bottom of the ink box main body 200 and are just aligned to the centers of liquid inlet flow channels at the upper ends of five nozzle assemblies 401 to be printed, the connection mode is mechanical connection, the nozzle assemblies 401 to be printed are ensured to be positioned on a straight line, the tail ends or the lower ends of nozzle spray needles are positioned at the same height, and the upper part of the ink box main body 200 is connected with the ink box main body top cover 100 to realize packaging.

The center of the ink box main body top cover 100 is provided with a hole for adding printing solution. The cartridge body top cover 100 is provided with a threaded hole for connecting the voltage input connector 700 connected with the cartridge body, and the cartridge body top cover and the cartridge body are made of transparent insulating materials, so that the solution can be conveniently added and replaced.

The lower portion of the cartridge main body 200 is fixedly coupled to the support main body 300.

The support body 300 is provided with 7 threaded through holes for the purpose of facilitating the mechanical attachment of seven nozzle assemblies 400 to the support body, wherein the auxiliary nozzle assembly 402 does not introduce solution and gas, and the auxiliary nozzle assembly 402 and the remaining 5 nozzle assemblies to be printed 401 are supplied with the same periodic pulsed ac voltage. The corresponding 7 guide electrode rings 500 are aligned with the center of the nozzle needle under the seven nozzle assemblies 400, all the guide electrode rings 500 are connected with the periodic pulse alternating current voltage, the frequency of the periodic pulse alternating current voltage is consistent with that of the periodic pulse alternating current voltage connected into the nozzle assemblies 400, and the absolute value of the voltage amplitude of the periodic pulse alternating current voltage is always smaller than that of the periodic pulse alternating current voltage connected into the nozzle assemblies. The nozzle assembly 400, the guide electrode ring 500, and the base plate 600 form a gradient electric field with electric field lines directed vertically downward, and the electrode function of the auxiliary nozzle assembly 402 is to balance the uneven distribution of the electric field such that the integrated field strength is directed vertically downward.

Referring to fig. 4, each nozzle assembly 400 (the nozzle assembly 401 to be printed and the auxiliary nozzle assembly 402) is cylindrical and includes a nozzle needle 410 disposed at the center of a cylindrical housing, a section of annular buffer air chamber at the periphery of the nozzle needle 410, two symmetrical air holes 420 formed on two side walls of the housing and respectively communicated with the annular buffer air chamber, and an air hole channel member 430 communicated with the buffer air chamber and uniformly disposed below the symmetrical air holes 420 and having an annular array. As shown in fig. 5-6, the buffer plenum is located directly above the air vent channel element 430 between the inner wall of the housing of the nozzle assembly 400 (including the air inlet holes) and the enclosed area at the top of the nozzle assembly. The gas hole channel element 430 below the buffer gas chamber is provided with 6 annular array gas hole channels, the top parts of the 6 annular array gas hole channels are communicated with the buffer gas chamber, the bottom parts of the 6 annular array gas hole channels are provided with through holes, so that the gas flow entering from the gas inlet channel 403 can conveniently pass through the buffer gas chamber and then downwards form auxiliary gas to uniformly surround the periphery of the jet flow solution at the tail end of the nozzle assembly 400, the electrogenerated repulsion force generated by conical jet flow of adjacent nozzle assemblies is reduced to generate jet flow deflection, the auxiliary gas surrounds the periphery of the nozzle to form stable gas flow, the stretching and restraining effects are generated on the jet flow, and the critical starting voltage for generating; meanwhile, the auxiliary airflow plays a role in shielding, the interference and inhibition among the electrified jet flows at each position are weakened, and the long-time stable injection of the high-density multi-jet flows is ensured.

A plurality of air inlet flow channels 403 are arranged on two sides of the support main body 300 in a linear array corresponding to the symmetrical air holes 420 of each nozzle assembly 400; the height positions of the intake runners 403 on both sides are the same.

The air vent channel member 430 may be assembled as a separate component at the nozzle tip or may be integrally formed with the nozzle assembly 400. The number of the air hole channels of the air hole channel member 430 may be m (m is a natural number, and may be 3 to 10, preferably 3 to 8, or 6 as given in this embodiment).

The symmetrical air holes 420 are aligned with the centers of the symmetrical inlet channels 403 on the supporting body 300 for communication. The air inlet holes on the two sides have the function of enabling the entering air flow to be distributed more uniformly, and the air flow entering each annular array air duct is the same. The top of the annular buffer air chamber is a housing enclosure and the bottom communicates with the air vent passage element 430.

The connection part of the plurality of nozzle assemblies 400 and the ink cartridge main body 200 is connected with a periodic pulse alternating current voltage, the solution to be printed enters the liquid inlet flow channel at the upper end of the nozzle assembly 400 from the ink cartridge main body 200 under the action of pneumatic back pressure, 10 air inlet flow channels 403 symmetrically distributed at two sides of the support main body 300 are ventilated, and auxiliary air flow enters the buffer air chamber and then uniformly enters six annular array air hole channels in the air hole channel element 430.

As shown in fig. 4-6, in the nozzle assembly 400, the printing solution enters from the nozzle needle 410, the auxiliary air flow enters the buffer air chamber from the nozzle shell symmetrical air hole 420, and then passes through the annular array air hole channel in the air hole channel element 430 to form an annular array air flow to surround the cone jet flow, so that the jet flow interference of the adjacent nozzles is inhibited, and the cone jet flow is accurately printed on the substrate.

In a preferred embodiment of the present invention, the periodic pulse ac voltage to which all the nozzle assemblies 400 are connected is 1.9kV, or 0-10 kV; the periodic pulse alternating current voltage connected to all the guide electrode rings is 0.45kV, and can also be 0-1 kV; the substrate 600 is grounded.

In the preferred embodiment of the present invention, simple holes are formed at four corners of the upper side of the cartridge body 200 to facilitate the connection with the cartridge body top cover 100 for packaging, and a hole with a diameter of 3mm is formed at the center of the cartridge body top cover 100 for adding printing solution.

In a preferred embodiment of the present invention, the cartridge main body top cover 100 is formed with a threaded hole having a diameter of 2mm for connecting to a voltage input connector 700 (the voltage input connector 700 is preferably a screw, and is energized in a specific manner that the energized screw receives an electrostatic ac voltage) connected to the cartridge main body.

In the preferred embodiment of the present invention, the top cover 100 and the main body 200 are made of transparent insulating material, which is used to facilitate the addition and replacement of the solution.

In a preferred embodiment of the present invention, four small holes with a diameter of 1mm are formed at four corners of the lower part of the ink cartridge main body 200 to facilitate the connection of the ink cartridge main body 200 and the supporting main body 300 by screws, and the supporting main body 300 has a specification of 40mm × 20mm × 10 mm.

In a preferred embodiment of the present invention, n (n is a natural number, which may be 2 to 10, preferably 3 to 8, or 7 given in this embodiment) nozzle assemblies 401 to be printed may be disposed on a straight line where the nozzles arranged in an array are located, as long as it is ensured that two ends of the straight line are each provided with one auxiliary nozzle assembly 402. Accordingly, multiple arrays of nozzle assemblies 400 may be arranged in parallel. The printing efficiency can be significantly improved when the nozzle assemblies 400 in different rows are arranged in a staggered manner, but multiple rows can be aligned and arranged in parallel as required.

In a preferred embodiment of the present invention, the support body 300 is provided with 7 threaded through holes having a diameter of 2mm, in order to facilitate the mechanical coupling of seven nozzle assemblies 400 to the support body 300.

In a preferred embodiment of the present invention, the length of the nozzle needle 410 and the length of the housing are both 12mm, the diameter of the nozzle needle 410 is 1mm, the diameter of the annular array pneumatic control channel in the air hole channel element 430 below the buffer air chamber is set to be 0.3mm, a plurality of nozzles are arranged in a straight line, and the distance between adjacent nozzles is 3mm-5 mm.

In a preferred embodiment of the present invention, the distance between the nozzle needle 410 and the guide electrode ring 500 is 2mm to 4mm, and the distance between the guide electrode ring 500 and the base plate 600 is set to 2mm to 4 mm.

In a preferred embodiment of the present invention, the pilot electrode ring 500 is preferably held in place directly beneath each nozzle assembly 400 by mechanical clamping, and a voltage is applied to the pilot electrode ring 500 via an external electrode. Other means known in the art may be used to secure the guide electrode ring 500.

The printing method of the invention is realized according to the following steps:

after the printing solution enters the nozzle assemblies 400 from the ink cartridge main body 200, all the nozzle assemblies 400 are connected with the same periodic pulse alternating voltage, wherein the nozzle assembly 401 to be printed is connected with the periodic pulse alternating voltage through the voltage input connecting piece 700 and the printing solution, the two auxiliary nozzle assemblies 402 are connected with the periodic pulse alternating voltage through the plugs, and the printing solution is good in conductivity. As shown in fig. 1, since all nozzle assemblies 400 are connected to the same periodic pulsed ac voltage, the tips of the 5 to-be-printed nozzle assembly components 401 form consistent taylor cone-shaped droplets under the action of pneumatic back pressure and the ac voltage connected to the nozzle assemblies.

Because the nozzle has a high potential, the liquid at the nozzle is subjected to an electrical shear stress, and when the local charge force exceeds the surface tension of the liquid droplet, the charged liquid is ejected from the end of the nozzle to form a taylor cone jet. All nozzle assemblies 400 are connected to the same periodic pulsed ac voltage such that the nozzle tips produce a periodic taylor cone jet. The purpose of the auxiliary nozzle assembly 402 to receive the periodic pulsed ac voltage is to balance the non-uniform electric field distribution so that the resultant field strength is directed vertically downward.

The invention utilizes the dual functions of airflow auxiliary jet flow and gradient electric field guided jet flow, reduces jet flow deflection caused by the action of electrical shear stress between adjacent nozzles, reduces the influence of peripheral flow fields on the deposition behavior of jet flow in electrofluid jet printing, applies airflow around the jet flow to provide external tensile force and constraint action for charged jet flow, and overcomes the interference of residual charge and a high-speed moving substrate.

On one hand, the evaporation of a solvent and the solidification of a solute structure are accelerated by the action of air flow, in the electrofluid jet printing, a printed jet has higher charge density, a cone jet can be taken as a charged particle or particle beam, the movement of the jet is mainly controlled by electric field force, and the distribution of the electric field in a printing space has great influence on the flight of the charged jet. The taylor cone jet formed by each nozzle assembly to be printed 401 is surrounded by a surrounding secondary air flow. The auxiliary airflow provides external tensile force and a constraint effect for the charged cone jet flow, overcomes the interference of residual charges and a high-speed moving substrate, and has the effects of inhibiting jet flow deflection and reducing jet flow interference.

On the other hand, in electrofluid jet printing, the cone jet flow has higher charge density, the Taylor cone jet flow can be regarded as charged particles or particle beams, the movement of the cone jet flow is mainly controlled by electric field force, and the distribution of the electric field in the printing space has great influence on the flight of the charged jet flow. The nozzle assembly 400, the guide electrode ring 500 and the grounded substrate 600 form a gradient electric field vertically downward, and guide the cone jet solution to vertically print on the substrate along the field intensity direction.

Further, in the inline nozzle row exemplified by the present invention, the placement of the guide electrode ring 500 directly under all the nozzle assemblies 400 further reduces jet interference between adjacent nozzle assemblies 400, guiding the jet to print accurately on the substrate 600. While the inline arrangement of multiple nozzle assemblies 400 in parallel greatly improves the efficiency of printing.

Further, the air hole channel member 430 is provided with a plurality of annular arrays of air hole channels, which may be n, preferably 3-8 air hole channels.

When the in-line nozzle arrangement is not provided with the additional nozzle assemblies 402 on both sides, as shown in fig. 7, it can be seen that the taylor cone jet stream is deflected by the interference of the electrically generated repulsion between adjacent nozzles, only the taylor cone jet stream generated by the centermost nozzle assembly 401 is vertically printed onto the substrate, while the taylor cone jet streams generated by the remaining nozzle assemblies are deflected to different degrees, with the greater the deflection of the taylor cone jet stream generated further from the centermost nozzle assembly. As shown in fig. 8, after the auxiliary nozzle assemblies 402 are added on two sides of the in-line nozzle assembly 401, the taylor cone jet generated by each nozzle assembly 400 can be vertically printed on the substrate, which means that the auxiliary nozzle assemblies 402 can effectively reduce the interference of the electric repulsion between adjacent nozzle assemblies, and realize the accurate printing of the taylor cone jet on the substrate. FIG. 9 is a graph of the periodically pulsed AC voltage applied to the nozzle assembly 400 and the pilot electrode ring 500. FIG. 9 is a graph of the periodically pulsed AC voltage applied to the nozzle assembly 400 and the pilot electrode ring 500. The frequency of the periodic pulsed ac voltage applied to all the guide electrode rings 500 is consistent with the periodic pulsed ac voltage applied to the nozzle assembly 400, but its voltage amplitude V2 is always smaller in absolute value than the voltage amplitude V1 of the periodic pulsed ac voltage applied to the nozzle assembly.

The embodiments described above are some, but not all embodiments of the present application. The detailed description of the embodiments of the present application is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

Claims

1. An inline electrofluid printing head that suppresses jet interference, comprising:

2. An in-line electrofluidic print head as claimed in claim 1, characterized in that a separate guide electrode ring (500) is provided below each nozzle assembly (400), and a plurality of guide electrode rings (500) are provided in a linear array in line with the corresponding nozzle assemblies (400) above.

3. The in-line electrofluid printing head capable of suppressing jet interference according to claim 1, wherein a plurality of identical nozzle assemblies (400) are arranged in a linear array at intervals on the support body (300), two nozzle assemblies (400) located at both ends of the line are plugged at a region of the cartridge to prevent the inflow of the printing solution, and the plugs are configured to be capable of receiving an alternating voltage through the voltage input connector (700); each nozzle assembly (400) is configured to form a vertically downward gradient electric field with the guide electrode ring (500) and the ground substrate (600) when an alternating voltage is applied.

4. An in-line electrofluidic printing head with suppression of jet interference according to claim 1, characterized by a plurality of rows of linear array-type nozzle assemblies (400) juxtaposed on a support body (300).

5. An in-line electrofluidic printing head with jet disturbance suppression according to claim 1, characterized in that a plurality of rows of linear array nozzle assemblies (400) are juxtaposed on the support body (300), and the nozzle assemblies (400) in each row are staggered.

6. The in-line electrofluid printing head for suppressing jet interference according to claim 1, wherein the cartridge top cover (100) is formed with an inlet hole, and the cartridge body (200) has a solution passage formed in the bottom plate thereof to be centrally butted against the inlet hole of the nozzle assembly (400).

7. The in-line electrofluid printing head according to claim 1, wherein the nozzle assembly (400) is cylindrical and comprises a cylindrical nozzle needle (410) disposed in a cylindrical housing, an annular buffer air chamber disposed around the nozzle needle (410) and located in a closed region between the nozzle needle (410) and the housing, two symmetrical air holes (420) formed in two side walls of the housing and respectively communicated with the annular buffer air chamber, and an air hole channel member (430) having an annular array of air holes and respectively communicated with the bottom of the buffer air chamber and located below the symmetrical air holes (420); two sides of the support main body (300) are correspondingly communicated with symmetrical air holes (420) of the nozzle assembly (400) positioned in the middle of a straight line to form linear array type air inlet channels (403); the height positions of the air inlet flow channels (403) on the two sides are the same; two nozzle assemblies (400) at either end of the line are not provided with inlet flow.

8. An in-line electrofluidic print head as claimed in claim 1 wherein the vent channel element (430) has a plurality of annular arrays of vent channels, each vent channel having a top communicating with the buffer chamber and a bottom with a through hole, said vent channels being configured to direct the flow of buffer chamber down to form a secondary gas to uniformly surround the conical jet at the end of the nozzle assembly.

9. A method of printing, characterized in that with a fluidic interference suppressible electrofluidic inkjet printhead according to any of claims 1-8, after the printing solution enters the nozzle assemblies (400), all nozzle assemblies (400) are switched on with the same periodic pulsed ac voltage; all the guide electrode rings (500) are connected with periodic pulse alternating current voltage;

10. A printing method according to claim 9, characterized in that the frequency of the periodically pulsed ac voltage applied to the leading electrode ring (500) is kept the same as the periodically pulsed ac voltage applied to the nozzle assembly (400), and the absolute value of the amplitude of the voltage applied to the leading electrode ring (500) is always smaller than the absolute value of the amplitude of the voltage applied to the nozzle assembly (400).