CN113211983B - Piezoelectric ink-jet system applied to printing ink drops and optimization method thereof - Google Patents
Piezoelectric ink-jet system applied to printing ink drops and optimization method thereof Download PDFInfo
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- CN113211983B CN113211983B CN202110406779.7A CN202110406779A CN113211983B CN 113211983 B CN113211983 B CN 113211983B CN 202110406779 A CN202110406779 A CN 202110406779A CN 113211983 B CN113211983 B CN 113211983B
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- 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
- B41J2/04501—Control methods or devices therefor, e.g. driver circuits, control circuits
- B41J2/04516—Control methods or devices therefor, e.g. driver circuits, control circuits preventing formation of satellite drops
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- 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
- B41J2/14016—Structure of bubble jet print heads
- B41J2/14088—Structure of heating means
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- 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
- B41J2/14201—Structure of print heads with piezoelectric elements
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- 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
- B41J29/00—Details of, or accessories for, typewriters or selective printing mechanisms not otherwise provided for
- B41J29/38—Drives, motors, controls or automatic cut-off devices for the entire printing mechanism
- B41J29/393—Devices for controlling or analysing the entire machine ; Controlling or analysing mechanical parameters involving printing of test patterns
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Abstract
The invention discloses a piezoelectric ink-jet system applied to printing ink drops, which comprises a central control system, a piezoelectric ink-jet subsystem and an ink drop optimization system, wherein the piezoelectric ink-jet subsystem and the ink drop optimization system are respectively connected with the central control system; the piezoelectric ink-jet subsystem comprises a piezoelectric driving module, a piezoelectric nozzle and an ink supply assembly, wherein the piezoelectric driving module is connected with the central control system, the piezoelectric nozzle comprises a plurality of nozzles, the piezoelectric nozzle is connected with the piezoelectric driving module, and the ink supply assembly is connected with the piezoelectric nozzle; the ink droplet optimizing system comprises a multi-channel heating device and a temperature control adjusting device, wherein a plurality of heating channels corresponding to nozzles on the piezoelectric nozzle are arranged in the multi-channel heating device, and the temperature control adjusting device is used for adjusting the temperature of each heating channel. A corresponding optimization method is also provided. The main ink drop and the satellite drop enter the multi-channel heating device together, the satellite drop is completely volatilized after being heated, the main ink drop is further reduced, and the limitation of the size of the spray head on ultrahigh-precision printing is overcome.
Description
Technical Field
The invention relates to the field of printed electronics, in particular to a piezoelectric ink jet system applied to printing ink drops and an optimization method thereof.
Background
Ink jet printing technology, a non-contact, non-pressure, non-mask printing technology, can spray very small droplets (with a volume of picoliters or femtoliters) precisely at a desired position, and form a thin film after the solvent is volatilized, dried and cured. The ink jet printing technology has the advantages of low cost, large area, environmental protection and the like, so that the technology gradually becomes a wet method for preparing microelectronic devices, such as organic electroluminescent OLED devices (especially organic full-color display screens), color filters in LCDs, organic thin film field effect transistors, LED packages, wearable electronic devices and the like, and is more and more concerned by academia and industry.
However, at present, a lot of production process limitations exist in the field of ultrahigh precision printing, and the development of preparing high-quality film layers and ultra-precision display devices by ink jet printing is restricted by technical difficulties. For example, if a display screen with ultrahigh resolution is prepared by adopting an ink jet printing technology, an ink jet head with extremely small diameter must be adopted firstly, the diameter of the currently adopted spray head is at the micron level, the manufacturing technology requirement of the spray head is extremely high, the price is high, faults are easy to occur in the working process, and the prepared screen still has a small difference compared with the evaporation technology; in addition, the ink jet printing process has poor stability, ink drop tailing phenomenon is easy to occur in the printing process, disordered satellite drops are generated around main ink drops finally deposited on a substrate, and the display effect of a device is seriously influenced.
For the optimization of ink drops and the feedback adjustment in the ink jet printing process, there are some related technical solutions in the prior patents, such as CN106808798B and other early patents. However, further studies have shown that the techniques involved in the prior patents still suffer from the following disadvantages: firstly, most of the nozzles are uniformly adjusted or singly adjusted by a single nozzle, all nozzles can not generate satellite drops in the spraying process of the multi-nozzle spray head, and the nozzles can not be effectively controlled by the same adjustment or the single adjustment; secondly, the generation of satellite droplets is mostly reduced by adjusting the external driving voltage or regulating and controlling the temperature of ink, but the size of the ejected main ink droplet is basically not influenced, the size of the main ink droplet is still limited by the diameter of the nozzle, the satellite droplets can only be reduced but not completely eliminated, and meanwhile, a small amount of satellite droplets can also cause material waste and environmental pollution. Accordingly, there is a need in the art to provide a more appropriate solution to meet the increasing demands of the current processes.
Disclosure of Invention
The invention aims to overcome the defects that the limitation of preparing an ultra-precision printing display device is caused by the limitation that the size of a nozzle cannot be further reduced in the existing ink jet printing technology, and the final printing quality is low due to satellite ink drops always existing in the ink jet printing process, and provides a piezoelectric ink jet system applied to printing ink drops and an optimization method thereof. By adopting the technical scheme of the invention, the size of the printing nozzle is not limited, the ejected main ink drop is further reduced, and the requirement of higher-precision printing display is met; meanwhile, the system and the optimization method designed by the invention can disregard the satellite ink drops in the falling process, do not need to adopt special printing ink, do not need to regulate and control the optimal ink temperature, can automatically eliminate the satellite drops, and recycle a small amount of solute particles in the satellite drops for secondary utilization, thereby greatly reducing the printing cost.
In order to achieve the aim, the invention provides a piezoelectric ink jet system applied to printing ink drops, which comprises a central control system, a piezoelectric ink jet subsystem and an ink drop optimization system, wherein the piezoelectric ink jet subsystem and the ink drop optimization system are respectively connected with the central control system;
the piezoelectric ink-jet subsystem comprises a piezoelectric driving module, a piezoelectric nozzle and an ink supply assembly, wherein the piezoelectric driving module is connected with the central control system, the piezoelectric nozzle comprises a plurality of nozzles, the piezoelectric nozzle is connected with the piezoelectric driving module, and the ink supply assembly is connected with the piezoelectric nozzle;
the ink droplet optimizing system comprises a multi-channel heating device and a temperature control adjusting device, wherein a plurality of heating channels corresponding to nozzles on the piezoelectric nozzle are arranged in the multi-channel heating device, and the temperature control adjusting device is used for adjusting the temperature of each heating channel in the multi-channel heating device.
After the technical scheme is adopted, the main ink drop and the tail satellite drop enter the multi-channel heating device in the ink drop optimization system together, the satellite drops are completely volatilized after being heated, the main ink drop passing through the multi-channel heating device is further reduced, and the limitation of the size of the spray head on ultrahigh-precision printing is overcome.
The invention further improves the scheme of the invention and further comprises an ink drop monitoring system, wherein the ink drop monitoring system comprises a camera for collecting images when ink drops fall, and the camera is connected with the central control system.
The ink droplet monitoring system further comprises a light source controller and a parallel detection light source, wherein the light source controller is connected with the central control system, and the parallel detection light source is connected with the light source controller.
The invention further improves the scheme that the central control system comprises an upper computer, an image acquisition module, an image analysis module and a data processing module, wherein the image acquisition module acquires falling images of ink drops through a camera, the image acquisition module is used for acquiring the images of the falling ink drops, the image analysis module is used for analyzing whether satellite drops still exist according to the images of the falling ink drops, the data processing module is used for acquiring serial numbers of nozzles for jetting the satellite drops, and the upper computer is used for sending a temperature control regulating instruction to the temperature control regulating device according to the serial numbers.
The piezoelectric driving module in the piezoelectric ink-jet subsystem comprises a PCI waveform generating card and a voltage amplifier, wherein the PCI waveform generating card is in communication connection with the central control system, and the voltage amplifier is connected with the PCI waveform generating card.
The ink supply assembly comprises a pneumatic pump and an ink storage container, wherein the pneumatic pump is connected with the ink storage container through a pipeline, and the ink storage container is communicated with an ink input end of the piezoelectric nozzle.
The proposal of the invention is further improved, each heating channel in the multi-channel heating device is provided with a heating element,
the temperature control adjusting device comprises a multi-path relay, a single chip microcomputer and a serial port conversion module, wherein the output end of the single chip microcomputer is connected with the multi-path relay to control the on-off of each branch of the multi-path relay, the single chip microcomputer is connected with a central control system through the serial port conversion module, and each heating element is electrically connected with each branch of the multi-path relay. The temperature of the heating channel can be adjusted through the temperature control adjusting device, and the temperature of the heating channel can be adjusted in a targeted manner through the multi-path relay.
According to the further improvement of the scheme of the invention, the ink droplet optimization system further comprises a solute particle recovery device for recovering solute particles generated after the satellite droplets are volatilized, and the solute particle recovery device is communicated with the heating channel in the multi-channel heating device. Solute particles generated after the satellite drops are volatilized are recovered by the solute particle recovery device, so that the pollution of the solute particles is avoided, and the secondary utilization can be realized.
The invention also provides a piezoelectric ink-jet optimization method applied to printing ink drops, which adopts the piezoelectric ink-jet system and comprises the following steps:
the central control system sends out a printing instruction;
a piezoelectric driving module of the piezoelectric ink-jet subsystem receives a printing instruction and excites a piezoelectric nozzle to jet ink drops;
the ejected ink drops enter a multi-channel heating device in the ink drop optimization system, the temperature of the multi-channel heating device is adjusted by a temperature control adjusting device, a heating channel in the multi-channel heating device heats main ink drops and satellite drops entering the multi-channel heating device, the satellite drops are completely volatilized due to heating, the volume of the main ink drops is reduced due to heating, and the main ink drops reach a printing substrate.
In a further development of the process according to the invention, the process further comprises the following steps:
the central control system collects falling images of the ink drops coming out of the multi-channel heating device through the ink drop monitoring system and analyzes whether satellite drops still exist according to the falling images;
if the satellite drops still exist, the central control system obtains the serial numbers of the nozzles for jetting the satellite drops according to the falling images, and the temperature in the heating channels corresponding to the nozzles in the multi-channel heating device is heated through the temperature control adjusting device, so that the satellite drops still exist are eliminated. Finally, the satellite droplets influencing the printing precision are almost completely volatilized, the main ink droplets with finer sizes are left to participate in the deposition of the substrate, the printing precision is greatly improved, and the limitation that small-size nozzles are difficult to process is overcome.
Compared with the prior art, the invention has the following beneficial effects:
(1) the piezoelectric ink-jet system applied to high-precision printing of ink drops comprises a central control system, a piezoelectric ink-jet subsystem, an ink drop monitoring system and an ink drop optimization system, wherein each subsystem is controlled by the central control system and feeds data back to the central control system in real time, the regulation and control process is highly automatic, and high-precision optimization of falling ink drops can be realized without human intervention.
(2) The invention relates to a piezoelectric ink-jet system applied to high-precision printing ink drops and an optimization method thereof, wherein the ink drop optimization system adopts the combination of a multi-channel heating device, a temperature control regulating device and a solute particle recovery device, and the satellite ink drops in the channels can be completely volatilized by utilizing the multi-channel heating device, and the main ink drops are further reduced, so that technical support is provided for higher-precision printing display, the limitation on preparing an ultra-precision printing display device caused by the limitation that the size of a nozzle cannot be further reduced is overcome, and the requirement of a production process is greatly reduced; meanwhile, the solute particle recovery device can recover a small amount of solute particles existing in the satellite drops for secondary utilization, so that the pollution of the solute particles is avoided, and the printing cost is greatly reduced.
(3) The invention relates to a piezoelectric ink-jet system applied to high-precision printing ink drops and an optimization method thereof.A ink drop monitoring system can continuously acquire a whole image in the ink drop falling process and perform image comparison and analysis, the whole falling ink drop image is divided into images corresponding to the number of nozzles by utilizing image division sequence matching, the divided images correspond to the nozzle serial numbers, and then whether each divided image contains tiny satellite drops or not is detected, a data result is fed back to a data processing module, and a temperature control adjusting device is controlled to independently regulate and control each heating channel; meanwhile, in the actual printing process, the number of heating channels for actual work can be flexibly regulated and controlled in the upper computer according to the number of nozzles of the spray heads of different models, so that the dropping state of all nozzles can be integrally controlled, and the optimization of a single heating channel can be realized.
(4) The piezoelectric control system applied to high-precision printing ink drops and the optimization method thereof can finally obtain a high-level surface, the system and the optimization method are simple and feasible, have higher stability for ink-jet printing, can not increase additional process steps, can be compatible with large-area film preparation, and further promote the realization of high-performance printing electronic devices.
Drawings
FIG. 1 is a data interaction diagram between subsystems of a piezoelectric ink jet system for high precision printing of ink drops in accordance with the present invention;
FIG. 2 is a schematic block diagram of a piezoelectric ink jet system and its optimization method for high precision printing of ink droplets according to the present invention;
FIG. 3 is a cross-sectional view of a multi-channel warming device of the piezoelectric ink jet system of the present invention applied to high precision printing of ink drops;
FIG. 4 is a flow chart of the operation of the piezo ink jet optimization method of the present invention applied to high precision printing of ink drops;
FIG. 5 is a schematic illustration of the satellite drop elimination process of the piezoelectric inkjet optimization method of the present invention applied to high precision printing ink drops;
FIG. 6 is a schematic representation of satellite droplet survival after thermal treatment for the piezo inkjet optimization method of the present invention applied to high precision printed ink droplets;
fig. 7 is a diagram of an image analysis process of the piezoelectric inkjet optimization method applied to high-precision printing ink droplets according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments. 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 invention.
At present, the requirement of industrial manufacturing on the precision of inkjet printing is higher and higher, for example, in the field of manufacturing of display devices, theoretically, an ultra-high resolution display device can be realized by using an inkjet printing technology, but because the size of a nozzle cannot be further limited to be small and the development of the technology is severely restricted by ink droplet satellite droplets which cannot be solved all the time in the printing process, an ink droplet monitoring and optimizing system in the whole printing process is developed to solve the problems of manpower, a monitoring end and the like, further overcome the restriction of the size of a nozzle on the development of ultra-high resolution printing display, and realize accurate monitoring and elimination of the satellite droplets so as to meet the requirement of high-quality printing.
As shown in fig. 1, the piezoelectric ink jet system applied to printing ink droplets of the present invention includes a central control system 1, a piezoelectric ink jet subsystem 2, an ink droplet monitoring system 4, and an ink droplet optimizing system 3, where the piezoelectric ink jet subsystem 2, the ink droplet monitoring system 4, and the ink droplet optimizing system 3 are all controlled by the central control system 1, and feed back data to the central control system 1.
In one embodiment of the present invention, as shown in fig. 2, the central control system 1 includes an upper computer 11, an image acquisition module 12, an image analysis module 13 and a data processing module 14. The image acquisition module 12 is used for acquiring an image of a falling ink droplet, and the image analysis module 13 is used for analyzing whether a satellite droplet still exists according to the image of the falling ink droplet; the data processing module 14 is configured to obtain a serial number of a nozzle that ejects a satellite droplet, and the upper computer sends a temperature control adjustment instruction to the temperature control adjustment device 32 according to the serial number.
More specifically, the image acquisition module adopts VAS image acquisition software, the image analysis module adopts a VDM vision development kit, and the data processing module adopts a LabVIEW data processing module. Specifically, as shown in fig. 2, the VAS image acquisition software, the VDM vision development kit and the LabVIEW data processing module are all integrated in an upper computer, and working parameters can be set in the upper computer.
In one embodiment of the present invention, the piezoelectric ink jet subsystem 2 includes a piezoelectric driving module 21, an ink supply assembly 23, and a piezojet 22. The piezoelectric driving module 21 is connected with the central control system 1, the piezoelectric nozzle 22 comprises a plurality of nozzles, the piezoelectric nozzle 22 is connected with the piezoelectric driving module 21, and the ink supply assembly 23 is connected with the piezoelectric nozzle 22 to supply required ink to the piezoelectric nozzle.
The piezoelectric driving module 21 includes a PCI waveform generating card and a voltage amplifier, data are mutually transmitted between the PCI waveform generating card and the upper computer in a PCI communication protocol mode, and pulse voltage output by the PCI waveform generating card is transmitted to the voltage amplifier through a circuit line and then amplified. The amplitude of a voltage signal output by the PCI waveform generation card is only 0-10V, which is not enough to drive a piezoelectric actuator in a piezoelectric nozzle, and the amplitude of the driving signal needs to be amplified by a voltage amplifier and then added to a piezoelectric nozzle end; the ink supply assembly 23 includes a positive and negative air pressure pump and an ink storage bottle, the positive and negative air pressure pump is communicated with the ink storage bottle through a hose, and the ink storage bottle is communicated with an ink input end of the piezoelectric nozzle 22 through a hose, so that stable ink delivery is realized. The ink droplets ejected by the piezo head 22 land on the print substrate 5.
In one embodiment of the present invention, the droplet monitoring system 4 includes a camera 41, a parallel detection light source 43, and a light source controller 42. Wherein, camera 41 adopts the high resolution camera, including CCD 411 and magnifying lens 412, the light source controller is connected with host computer 11, the light source controller connects 220V power supply to it links to each other with the parallel detection light source to draw forth the circuit line, and the switch and the power of control light source are close, and the emergent light of parallel detection light source 43 is towards ink droplet falling direction. The image acquisition of the CCD requires sufficient light for exposure, and the parallel detection light source 43 can provide sufficient light for the purpose of maintaining the brightness uniformity of the entire image, so that the pixel values (gray values) of the ink droplets in the image are uniform, and the interference of the post-image processing is reduced.
In one embodiment of the present invention, the ink droplet optimization system 3 comprises a multi-channel temperature raising device 31, a temperature control regulating device 32 and a solute particle recycling device 33.
A plurality of heating channels 311 corresponding to the nozzles of the piezojet 22 are provided in the multi-channel temperature increasing device 31, and the temperature control adjusting device 32 is used for adjusting the temperature of each channel in the multi-channel temperature increasing device 31. More specifically, the ink droplet optimization system 3 is located below the piezoelectric ink jet subsystem 2, and the heating channels 311 on the multi-channel warming device 31 in the ink droplet optimization system 3 are arranged in one-to-one correspondence with the nozzles on the piezoelectric nozzles 22 in the piezoelectric ink jet subsystem 2.
In one embodiment of the present invention, the temperature control adjusting device 32 includes a multi-path relay, a single chip, and a serial port conversion module. The single chip microcomputer is a TM32 single chip microcomputer, and the serial port conversion module is a CH340 serial port conversion module. The STM32 singlechip passes through communication between CH340 serial ports conversion module and host computer, connects with the dupont line between the two, multi-path relay passes through the circuit line and links to each other with the output pin of STM32 singlechip, and each way break-make of high-low level control relay through the pin.
Heating elements are arranged in each heating channel 311 in the multi-channel heating device 31, and each heating element is connected with each branch in the multi-path relay through a circuit line. The temperature control regulating instruction given by the upper computer is converted and output through the STM32 single chip microcomputer, and then each path of switch of the multi-path relay is controlled, and whether the heating channel is heated or not is further realized.
Each heating channel 311 in the multi-channel warming device 31 is provided with a recycling through hole 3111, and each recycling through hole 3111 is communicated with the solute particle recycling device 33 through a recycling pipeline 6.
The solute particle recycling device 33 includes a suction pump and a recycling bottle, specifically, the suction pump is connected to the recycling bottle through a pipeline, the suction pump can continuously and stably provide negative pressure suction, and the recycling bottle is communicated with the recycling through hole 3111 on the heating passage 311 through a recycling pipeline 6.
Wherein, the heating element is a heating pad, and the heating pad of each channel is led out through a circuit wire 7 to be connected with each branch of the multi-path relay; the recovery pipe 6 is a hose.
When the piezoelectric ink-jet system for printing ink drops with high precision works, a piezoelectric driving module 21 in a piezoelectric ink-jet subsystem 2 starts to output pulse voltage signals under the control of a printing instruction of a central control system 1, and drives an ink-jet head 22 to jet functional material ink drops under the stable ink feeding of an ink supply assembly 23, main ink drops and tail satellite drops enter a multi-channel heating device 31 in an ink drop optimization system 3 together, the satellite drops with smaller volumes are completely volatilized after being rapidly heated, residual solid solute particles of the generated fine satellite drops enter a solute particle recovery device 33 through a hose through a through hole formed in a heating channel 311 in the multi-channel heating device 31 to be secondarily utilized, the main ink drops after passing through the multi-channel heating device 31 are further reduced, and the limitation of the size of the ink-jet head on ultrahigh-precision printing is overcome; meanwhile, in order to prevent the satellite drops ejected by some nozzles from not being completely thermally volatilized, the whole thermally-treated falling ink drop image is collected by the ink drop monitoring system 4 in real time, the falling ink drop image is processed by the central control system, the nozzle serial number corresponding to the satellite drops is finally determined, and the temperature control adjusting device is used for independently heating the heating channel 311 where the 32 falling satellite drops are located, so that the satellite drops are further eliminated. The whole set of system and the optimization method can further promote the high-precision printing process.
The invention also provides an optimization method for optimizing the piezoelectric ink jet by adopting the piezoelectric ink jet system.
In one embodiment of the present invention, referring to fig. 4, a method for optimizing piezoelectric inkjet for high-precision printing ink droplets is provided, which comprises the following steps:
step 1: connecting a piezoelectric ink-jet subsystem 2, an ink droplet monitoring system 4 and an ink droplet optimizing system 3 to a central control system 1, and installing corresponding VAS image acquisition software, a VDM visual development kit and a LabVIEW data processing module in an upper computer;
and 2, step: the upper computer 11 in the central control system 1 gives a printing instruction, and the piezoelectric nozzle 22 in the piezoelectric ink-jet subsystem 2 starts to jet the functional material ink drops under the excitation of the piezoelectric driving module 21 and the continuous ink supply action of the ink supply assembly 23;
and step 3: the tail part of a main droplet in a falling ink droplet is accompanied by a satellite droplet, the main droplet and the satellite droplet enter a multi-channel heating device 31 in the ink droplet optimization system 3 together, and the satellite droplet is completely volatilized after being heated by a heating element in a heating channel 311 of the multi-channel heating device 31 to leave nano solute particles;
in one embodiment of the invention, the size of the satellite droplets is one tenth to one fifth of that of the main ink droplets, and the satellite droplets are completely volatilized after passing through the heating channel.
And 4, step 4: the air pump in the ink droplet optimization system 3 provides negative pressure suction, nano solute particles generated after the satellite droplets are completely volatilized are adsorbed into a recovery bottle for secondary utilization, pollution is avoided, the main ink droplets continuously fall under the action of gravity, partial solvent is volatilized by the main ink droplets after the main ink droplets pass through the multi-channel heating device 31, and the volume is reduced;
and 5: as shown in fig. 2 and 7, in order to prevent the satellite droplets ejected by some nozzles from being incompletely thermally volatilized, the VAS image acquisition software in the upper computer acquires the whole image of the falling ink droplets after heat treatment in real time by means of the high-resolution camera in the ink droplet monitoring system 4;
in one embodiment of the present invention, as shown in fig. 7, in step 5, the high-resolution camera viewing axis is parallel to the head movement trajectory, and images of the falling ink drops ejected by all nozzles at the same time can be obtained.
And 6: as shown in fig. 7, the VDM visual development kit performs multi-step image processing on the falling image, including gray level conversion and threshold segmentation, and automatically copies and segments the entire image to several single-nozzle ink drop falling images according to the number of corresponding nozzles, establishes image segmentation sequence matching, and determines whether there are still a few satellite drops;
in one embodiment of the invention, the gray level conversion of the image is to convert a color image stored by an upper computer into an HSL (color luminance saturation) image and then extract a luminance plane, wherein the luminance plane is completely corresponding to the gray level image, and the luminance plane is the only color plane capable of providing accurate expression of the gray level image and is further converted into the gray level image.
In one embodiment of the invention, the threshold segmentation of the image is to determine a gray threshold in the upper computer, divide the pixel group forming the image into two parts, the pixel points smaller than the threshold are black, and the pixel points larger than the threshold are white, so as to convert the image into a single black-and-white image, finally the ink drop is completely black, and the background is completely white, so that the target image has extremely high contrast, the irrelevant objects in the image are eliminated, and the later satellite drop detection is facilitated.
In one embodiment of the present invention, the image segmentation sequence matching is to segment the entire image of falling ink droplets into images corresponding to the number of nozzles, and to associate the segmented images with the nozzle numbers, thereby detecting whether each segmented image contains satellite droplets.
And 7: if a small amount of satellite droplets still exist, the data processing module acquires the nozzle serial numbers corresponding to the satellite droplets, and independently heats the heating channel where the falling ink droplets are located by using the temperature control adjusting device 32, so that the small amount of satellite droplets are further eliminated;
the temperature control adjusting device 32 can perform uniform temperature control processing on all the heating channels 311 in the multi-channel heating device 31, and can also independently adjust the temperature of a certain heating channel 311, and the specific working mode can be set in the upper computer.
And 8: after thermal volatilization and secondary temperature adjustment, the ink droplets finally deposited on the printing substrate 5 only contain main ink droplets without satellite droplets, and the smaller size of the ink droplets overcomes the limitation of the size of a spray head on the device in the ultrahigh-precision printing period, so that the ink droplets can be used for manufacturing ultrahigh-resolution display devices.
After the steps, the satellite drops influencing the printing precision are completely volatilized, the main ink drops with finer sizes are left to participate in the deposition of the substrate, the printing precision is greatly improved, and the limitation that the small-size sprayer is difficult to process is overcome.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (8)
1. A piezoelectric ink jet system for printing ink drops, comprising: the system comprises a central control system (1), a piezoelectric ink-jet subsystem (2) and an ink droplet optimization system (3), wherein the piezoelectric ink-jet subsystem (2) and the ink droplet optimization system (3) are respectively connected with the central control system (1);
the piezoelectric ink-jet subsystem (2) comprises a piezoelectric driving module (21), a piezoelectric nozzle (22) and an ink supply assembly (23), the piezoelectric driving module (21) is connected with the central control system (1), the piezoelectric nozzle (22) comprises a plurality of nozzles (221), the piezoelectric nozzle (22) is connected with the piezoelectric driving module (21), and the ink supply assembly (23) is connected with the piezoelectric nozzle (22);
the ink droplet optimization system (3) comprises a multi-channel heating device (31) and a temperature control adjusting device (32), wherein a plurality of heating channels (311) corresponding to nozzles on the piezoelectric nozzle (22) are arranged in the multi-channel heating device (31), and the temperature control adjusting device (32) is used for adjusting the temperature of each heating channel in the multi-channel heating device (31);
the ink drop monitoring system (4) comprises a camera (41) used for collecting images when ink drops fall, and the camera is connected with the central control system (1);
the central control system (1) comprises an upper computer (11), an image acquisition module (12), an image analysis module (13) and a data processing module (14), wherein the image acquisition module (12) acquires falling images of ink drops through a camera (41), the image acquisition module (12) is used for acquiring the images of the falling ink drops, the image analysis module (13) is used for analyzing whether satellite drops still exist according to the images of the falling ink drops, the data processing module (14) is used for acquiring serial numbers of nozzles for jetting the satellite drops, and the upper computer is used for sending temperature control adjusting instructions to a temperature control adjusting device (32) according to the serial numbers.
2. A piezoelectric ink jet system for printing ink drops, as claimed in claim 1, wherein: the ink drop monitoring system (4) further comprises a light source controller (42) and a parallel detection light source (43), the light source controller (42) is connected with the central control system (1), the parallel detection light source (43) is connected with the light source controller (42), and emergent light of the parallel detection light source (43) faces the falling direction of the ink drops.
3. A piezoelectric ink jet system for printing ink drops, as claimed in claim 1, wherein: the piezoelectric driving module (21) in the piezoelectric ink-jet subsystem (2) comprises a PCI waveform generating card and a voltage amplifier, wherein the PCI waveform generating card is in communication connection with the central control system (1), and the voltage amplifier is connected with the PCI waveform generating card.
4. A piezoelectric ink jet system for printing ink drops, as claimed in claim 1, wherein: the ink supply assembly (23) comprises a pneumatic pump and an ink storage container, wherein the pneumatic pump is connected with the ink storage container through a pipeline, and the ink storage container is communicated with an ink input end of the piezoelectric nozzle (22).
5. A piezoelectric ink jet system for printing ink drops, as claimed in claim 1, wherein: each heating channel (311) in the multi-channel heating device (31) is internally provided with a heating element,
temperature control adjusting device (32) include multi-channel relay, singlechip and serial ports conversion module, and the output of singlechip is connected with multi-channel relay in order to control each branch road break-make of multi-channel relay, and the singlechip passes through serial ports conversion module to be connected with central control system (1), and wherein, every heating member is connected with each branch road electricity in the multi-channel relay respectively.
6. A piezoelectric ink jet system for printing ink drops, according to any one of claims 1 to 5, wherein: the ink droplet optimization system (3) further comprises a solute particle recovery device (33) for recovering solute particles generated after the satellite droplets are volatilized, and the solute particle recovery device (33) is communicated with a heating channel (311) in the multi-channel heating device (31).
7. A method of piezo inkjet optimization for application to a printed ink drop, characterized in that a piezo inkjet system according to any one of claims 1 to 6 is used, said method comprising the steps of:
the central control system (1) sends out a printing instruction;
a piezoelectric driving module (21) of the piezoelectric ink jet subsystem (2) receives a printing instruction and excites a piezoelectric spray head (22) to spray ink drops;
the ejected ink drops enter a multi-channel heating device (31) in an ink drop optimization system (3), a temperature control adjusting device (32) adjusts the temperature of the multi-channel heating device (31), a heating channel (311) in the multi-channel heating device (31) heats main ink drops and satellite drops entering the multi-channel heating device, the satellite drops are completely volatilized due to heating, the volume of the main ink drops is reduced due to heating, and the main ink drops reach a printing substrate (5).
8. A piezoelectric inkjet optimization method for use with printed ink drops as claimed in claim 7, further comprising the steps of:
the central control system (1) acquires a falling image of the ink drop coming out of the multi-channel heating device (31) through the ink drop monitoring system (4), and analyzes whether the satellite drop still exists according to the falling image;
if the satellite drops still exist, the central control system (1) acquires the serial numbers of the nozzles for jetting the satellite drops according to the falling images, and the temperature in the heating channel (311) corresponding to the nozzles in the multi-channel heating device (31) is heated through the temperature control adjusting device (32) so as to eliminate the satellite drops still existing.
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| CN1103835A (en) * | 1993-12-18 | 1995-06-21 | 刘岸 | Ink drop forming method and continuous ink jet printing equipment using same method |
| CN104647920B (en) * | 2015-02-15 | 2017-03-01 | 广东峰华卓立科技股份有限公司 | A kind of printer head ink-jet detection and control system and its method of work |
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