CN111070900B - Piezoelectric ink-jet printing device for removing printing ink bubbles and control method thereof - Google Patents
Piezoelectric ink-jet printing device for removing printing ink bubbles and control method thereof Download PDFInfo
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- CN111070900B CN111070900B CN202010050690.7A CN202010050690A CN111070900B CN 111070900 B CN111070900 B CN 111070900B CN 202010050690 A CN202010050690 A CN 202010050690A CN 111070900 B CN111070900 B CN 111070900B
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- ink
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- vacuum pump
- cavity
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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
- B41J2/17—Ink jet characterised by ink handling
- B41J2/19—Ink jet characterised by ink handling for removing air bubbles
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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
- B41J2/165—Preventing or detecting of nozzle clogging, e.g. cleaning, capping or moistening for nozzles
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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
- B41J2/435—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of radiation to a printing material or impression-transfer material
- B41J2/44—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of radiation to a printing material or impression-transfer material using single radiation source per colour, e.g. lighting beams or shutter arrangements
- B41J2/442—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of radiation to a printing material or impression-transfer material using single radiation source per colour, e.g. lighting beams or shutter arrangements using lasers
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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
- B41J2/165—Preventing or detecting of nozzle clogging, e.g. cleaning, capping or moistening for nozzles
- B41J2002/16502—Printhead constructions to prevent nozzle clogging or facilitate nozzle cleaning
Abstract
The invention relates to a piezoelectric ink-jet printing device for removing printing ink bubbles and a control method thereof, wherein the piezoelectric ink-jet printing device comprises a chamber, an ink tube arranged in the chamber and an ink storage container used for replenishing ink to the ink tube through a channel, and is characterized in that: one side of the cavity is also connected with a vacuum pump, and a pressure sensor is arranged at an inlet of a connecting channel between the vacuum pump and the cavity; the vacuum pump and cavity connecting channel is also provided with a vacuum pump switch; the vacuum pump switch is connected with one end of a bubble detecting tube, and the other end of the bubble detecting tube is arranged inside the ink tube. The invention couples the ink-jet printer with the bubble removing device, so that the fine printing process is more stable, the film forming uniformity can be greatly improved, the nozzle blockage and the abrasion of nozzle instruments are reduced, the vacuumizing process step before ink printing and the vacuum drying after film forming are combined into a single bubble for detection and removal, the production period is shortened, and the production cost is saved.
Description
Technical Field
The invention belongs to the technical field of printing devices, and particularly relates to a piezoelectric ink-jet printing device for removing printing ink bubbles and a control method thereof.
Background
Since the invention of the 19 th century and the 50 th era, the ink jet printing technology has been widely applied due to the characteristics of no mask plate, clear printed images and the like. In recent years, with the improvement of the performance of organic light emitting materials and the development of ink jet printing equipment, the development of technology for preparing devices such as organic electroluminescent devices (OLEDs) by ink jet printing has received much attention, and the ink jet printing process is a process of spraying several pls (usually between 1 pl and several tens pls) onto a specific object at a frequency of several hundreds times per second or more, and then removing the solvent to form a dry film. Compared with the traditional vacuum evaporation, the service efficiency of the material is greatly improved, and in addition, because the device has a simple structure, the problems of MASK contraposition and the like do not exist, the yield can also be improved in a large scale in theory. There are two basic types of ink jet printing devices: continuous ink jet and drop-on-demand ink jet. The continuous ink-jet technology is widely used in the fields of ink-jet printers and partial digital printers. The on-demand ink jet has the advantages of small droplet size, accurate and controllable drop point and the like. The on-demand inkjet head is mainly classified into a piezoelectric type, an electrostatic type, a thermal bubble type, and an ultrasonic type in terms of its operation principle, and the piezoelectric type is mainly used in the industry at present.
In the process of preparing the OLED by using the printing mode, two important factors influencing the lightening effect of the screen are the uniformity of the appearance and the thickness of the film. In the printing process, because the ink is subjected to bubbles generated by external factors, in the printing process, the nozzle can be blocked or ink drops can not be accurately positioned, or bubbles are generated in the film after the film is formed, so that the film form is influenced. Therefore, it is common to perform vacuum evacuation before printing ink and then print, and after printing is completed, vacuum drying is performed again in order to flatten the film as much as possible. Both of these processes are time consuming and can result in damage to the film during the evacuation process before drying, possibly due to mishandling.
Disclosure of Invention
In view of the above, an object of the present invention is to provide a piezoelectric inkjet printing apparatus for removing bubbles of printing ink and a control method thereof.
In order to achieve the purpose, the invention adopts the following technical scheme:
a piezoelectric ink-jet printing device for removing printing ink bubbles comprises a cavity, an ink tube arranged in the cavity and an ink storage container used for replenishing ink to the ink tube through a channel, wherein a vacuum pump is further connected to one side of the cavity, and a pressure sensor is arranged at an inlet of the channel connecting the vacuum pump and the cavity; the vacuum pump and cavity connecting channel is also provided with a vacuum pump switch; the vacuum pump switch is connected with one end of a bubble detecting tube, and the other end of the bubble detecting tube is arranged inside the ink tube.
Furthermore, a vibration plate is arranged at the top of the cavity, and a piezoelectric element is arranged at the upper end of the vibration plate; electrodes are connected to two ends of the piezoelectric element.
Furthermore, the bubble detecting tube is of a two-section structure and is telescopic.
Furthermore, the bottom of the bubble test tube is in a pinhole shape, and holes with different sizes are uniformly distributed on the cross section of the pinhole-shaped structure.
Further, the first section of the bubble detection tube is embedded with a laser generator; the laser generator is annular, a movable pulley is arranged in the laser generator, the laser generator can move or rotate, and the laser can irradiate the liquid surface and the inside of the cavity without dead angles.
Furthermore, a position control module and a signal counter are also arranged on the laser generator; the position control module is connected with the laser generator and used for controlling the position of the laser generator; the signal counter is provided with three end ports, one end of the signal counter is connected with the laser generator, the other end of the signal counter is connected with the bubble detecting tube, and the other end of the signal counter is connected with the computer.
A method of controlling a piezoelectric inkjet printing apparatus for removing printed ink bubbles, comprising the steps of:
step S1, emitting laser through a laser generator, irradiating the liquid surface and the inside of the cavity, and inverting the information of the radius and the movement speed of the bubble by recording the duration and the fluctuation characteristic of the weakened light intensity;
step S2, a signal counter receives information feedback from a laser generator, records the number of generated bubbles and sends the bubbles to a computer port;
step S3, the computer port receives the bubble number from the signal counter, and transmits the number information of the corresponding aperture in the activated bubble detecting tube and the position information of the bubble to be reached to the bubble detecting tube;
and step S4, the bubble detecting tube starts the aperture according to the instruction, moves to the corresponding bubble position and eliminates the bubble.
Compared with the prior art, the invention has the following beneficial effects:
the device has an effective bubble removing function, can remove bubbles according to the receiving and sending of the information of the computer and the quick and accurate alignment of the bubble detecting tube, can greatly form uniform films, reduce the blockage of the spray head, reduce the delay of a production plan and the abrasion of instruments caused by the blockage of the spray nozzle, shorten the production period and save the production cost when the ink jet printer is coupled with the device for removing the bubbles of the printing ink.
Drawings
FIG. 1 is a schematic view of a piezoelectric inkjet head device with bubble removal according to an embodiment of the present invention;
FIG. 2 is an enlarged view of a bubble probe tube according to an embodiment of the present invention;
FIG. 3 is a control flow diagram according to an embodiment of the present invention;
in the figure: 1-electrode, 2-piezoelectric element, 3-vibration plate, 4-ink tube, 5-pressure sensor, 6-vacuum pump switch, 7-chamber, 8-channel, 9-ink storage, 10-bubble, 11-vacuum pump, 12-bubble detecting tube, 13-substrate, 1201-laser generator, 1202-position control unit and 1203-bubble detecting tube cross section.
Detailed Description
The invention is further explained below with reference to the drawings and the embodiments.
Referring to fig. 1, the present invention provides a piezoelectric inkjet printing apparatus for removing bubbles of printing ink, including a chamber, an ink tube disposed inside the chamber, and an ink storage container for replenishing ink to the ink tube through a channel, wherein a vacuum pump is further connected to one side of the chamber, and a pressure sensor is disposed at an inlet of the channel connecting the vacuum pump and the chamber; the vacuum pump and cavity connecting channel is also provided with a vacuum pump switch; the vacuum pump switch is connected with one end of a bubble detecting tube, and the other end of the bubble detecting tube is arranged inside the ink tube.
In this embodiment, the pressure sensor is located at the inlet of the vacuum pump connection channel, and can monitor the air pressure change in the chamber in real time, the air pressure change caused by the semi-closed state of the chamber due to the volume reduction of the liquid along with the printing time can affect the jettability of the ink droplet, and the air pressure in the chamber is kept relatively constant by combining the vacuum pump; preferably, the pressure sensor has a detection accuracy of 0.2% -0.5% FS, the jettability of the ink drop is influenced by the change of air pressure caused by the semi-closed state of the chamber due to the volume reduction of the liquid along with the printing time, the air pressure inside the chamber is kept relatively constant by combining a vacuum pump, the pressure ranges from-30 mbar to-2 mbar, and the optimal pressure value is related to the ink property.
In this embodiment, a vibrating plate is further disposed on the top of the chamber, and a piezoelectric element is disposed at an upper end of the vibrating plate; electrodes are connected to two ends of the piezoelectric element. The piezoelectric element has an inverse piezoelectric effect and can generate deformation of different degrees according to the magnitude of an external applied pulse. According to the characteristics, when appropriate pulse is given, the piezoelectric element deforms to drive the vibrating plate to deform, the air pressure of the chamber is influenced, and ink is sucked from the ink storage container through the channel, enters the ink tube and is extruded and jetted from the nozzle. Preferably, the ink is first of all provided with printable properties, a dimensionless number Z describing whether it is printable, the Z value being related to the viscosity, surface tension, density of the ink and the diameter of the print head, the Z value being in the range of 1-50, preferably in the range of 2-20 for different print heads and ink systems, and the viscosity of the corresponding related ink being in the range of 1-50 cp.
Referring to fig. 2, in this embodiment, the bubble detecting tube has a two-stage structure, is telescopic, and is connected to a vacuum pump switch valve, the bottom of the bubble detecting tube is pinhole-shaped, and holes with different sizes are uniformly distributed on the cross section of the pinhole-shaped structure, so that the most suitable hole can be intelligently selected according to the radius and the movement speed of the bubble generated by the laser generator, the specific position of the bubble is combined, the bubble is eliminated, and the bubble is removed from the system through a corresponding connected air tube;
in the embodiment, the first section of the bubble detecting tube is embedded with a laser generator; the laser generator is annular, a movable pulley is arranged in the laser generator, the laser generator can move or rotate, and the laser can irradiate the liquid surface and the inside of the cavity without dead angles. When bubbles exist in liquid, laser is attenuated in the transmission direction due to refraction and reflection of the bubbles, and the information of the radius and the movement speed of the bubbles can be inverted by recording the duration time and the fluctuation characteristic of weakened light intensity;
furthermore, a position control module and a signal counter are also arranged on the laser generator; the position control module is connected with the laser generator and used for controlling the position of the laser generator; the signal counter is provided with three end ports, one end of the signal counter is connected with the laser generator, the other end of the signal counter is connected with the bubble detecting tube, and the other end of the signal counter is connected with the computer. The signal counter receives information feedback from the laser generator, records the number of generated bubbles and sends the number to the computer port, and the computer port transmits the number information of the corresponding apertures in the activated bubble detecting tube and the position information of the bubbles to be reached to the bubble detecting tube by receiving the number of the bubbles from the signal counter;
referring to fig. 3, in the present embodiment, there is provided a control method of a piezoelectric inkjet printing apparatus for removing bubbles of printing ink, including the steps of:
step S1, emitting laser through a laser generator, irradiating the liquid surface and the inside of the cavity, and inverting the information of the radius and the movement speed of the bubble by recording the duration and the fluctuation characteristic of the weakened light intensity;
step S2, a signal counter receives information feedback from a laser generator, records the number of generated bubbles and sends the bubbles to a computer port;
step S3, the computer port receives the bubble number from the signal counter, and transmits the number information of the corresponding aperture in the activated bubble detecting tube and the position information of the bubble to be reached to the bubble detecting tube;
and step S4, the bubble detecting tube starts the aperture according to the instruction, moves to the corresponding bubble position and eliminates the bubble.
The above description is only a preferred embodiment of the present invention, and all equivalent changes and modifications made in accordance with the claims of the present invention should be covered by the present invention.
Claims (4)
1. The utility model provides a get rid of piezoelectricity inkjet printing device of printing ink bubble, includes the cavity, sets up the ink tube inside the cavity and is used for the ink storage container of ink tube replenishment ink through the passageway, its characterized in that: one side of the cavity is also connected with a vacuum pump, and a pressure sensor is arranged at an inlet of a connecting channel between the vacuum pump and the cavity; the vacuum pump and cavity connecting channel is also provided with a vacuum pump switch; the vacuum pump switch is connected with one end of a bubble detection tube, and the other end of the bubble detection tube is arranged in the ink tube; the bubble detection tube is of a two-section structure, can stretch and is connected with a vacuum pump switch valve, the bottom of the bubble detection tube is in a pinhole shape, and holes with different sizes are uniformly distributed on the cross section of the pinhole structure; a laser generator is embedded in the first section of the bubble detection tube; the laser generator is annular, a movable pulley is arranged in the laser generator, the laser generator can move or rotate, and the laser can irradiate the liquid surface and the inside of the cavity without dead angles.
2. A piezoelectric inkjet printing apparatus for removing printed ink bubbles as defined in claim 1 wherein: the top of the cavity is also provided with a vibrating plate, and the upper end of the vibrating plate is provided with a piezoelectric element; electrodes are connected to two ends of the piezoelectric element.
3. A piezoelectric inkjet printing apparatus for removing printed ink bubbles as defined in claim 1 wherein: the laser generator is also provided with a position control module and a signal counter; the position control module is connected with the laser generator and used for controlling the position of the laser generator; the signal counter is provided with three end ports, one end of the signal counter is connected with the laser generator, the other end of the signal counter is connected with the bubble detecting tube, and the other end of the signal counter is connected with the computer.
4. A method of controlling a piezoelectric inkjet printing apparatus for de-bubbling printed ink according to claim 1, including the steps of:
step S1, emitting laser through a laser generator, irradiating the liquid surface and the inside of the cavity, and inverting the information of the radius and the movement speed of the bubble by recording the duration and the fluctuation characteristic of the weakened light intensity;
step S2, a signal counter receives information feedback from a laser generator, records the number of generated bubbles and sends the bubbles to a computer port;
step S3, the computer port receives the bubble number from the signal counter, and transmits the number information of the corresponding aperture in the activated bubble detecting tube and the position information of the bubble to be reached to the bubble detecting tube;
and step S4, the bubble detecting tube starts the aperture according to the instruction, moves to the corresponding bubble position and eliminates the bubble.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010050690.7A CN111070900B (en) | 2020-01-17 | 2020-01-17 | Piezoelectric ink-jet printing device for removing printing ink bubbles and control method thereof |
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| CN202010050690.7A CN111070900B (en) | 2020-01-17 | 2020-01-17 | Piezoelectric ink-jet printing device for removing printing ink bubbles and control method thereof |
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| CN111070900B true CN111070900B (en) | 2021-01-29 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111761938B (en) * | 2020-07-09 | 2021-02-26 | 深圳市全印图文技术有限公司 | Ink supply device of industrial digital printer |
| CN113580777B (en) * | 2021-07-02 | 2022-08-12 | 福州大学 | Automatic wash inkjet printing shower nozzle device |
| CN114889333B (en) * | 2022-04-27 | 2023-02-10 | 华中科技大学 | Regulation and control method and device for eliminating bubble defects in jet printing process |
| CN115593115B (en) * | 2022-11-28 | 2023-03-14 | 季华实验室 | Printing nozzle bubble discharge method and device and computer readable storage medium |
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| JP2727196B2 (en) * | 1988-05-25 | 1998-03-11 | キヤノン株式会社 | Ink jet recording device |
| JP2980444B2 (en) * | 1991-01-19 | 1999-11-22 | キヤノン株式会社 | Liquid ejector having bubble introduction mechanism in liquid chamber, recording apparatus and recording method using the same |
| JPH0872254A (en) * | 1994-09-01 | 1996-03-19 | Brother Ind Ltd | Manufacture of ink jet device |
| JPH08309975A (en) * | 1995-05-17 | 1996-11-26 | Brother Ind Ltd | Ink jet apparatus |
| US5815185A (en) * | 1996-11-13 | 1998-09-29 | Hewlett-Packard Company | Ink flow heat exchanger for inkjet printhead |
| US7168800B2 (en) * | 2003-07-17 | 2007-01-30 | Brother Kogyo Kabushiki Kaisha | Inkjet recording apparatus and ink cartridge |
| KR20080055550A (en) * | 2006-12-15 | 2008-06-19 | 삼성전자주식회사 | Image forming apparatus |
| US20080158304A1 (en) * | 2006-12-28 | 2008-07-03 | Toshiba Tec Kabushiki Kaisha | Ink-jet head |
| JP6264802B2 (en) * | 2013-09-20 | 2018-01-24 | セイコーエプソン株式会社 | Liquid ejecting apparatus and pressure increasing / decreasing method |
| JP6314632B2 (en) * | 2014-05-02 | 2018-04-25 | 株式会社リコー | Image forming apparatus |
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| JP6597777B2 (en) * | 2015-05-25 | 2019-10-30 | コニカミノルタ株式会社 | Inkjet head, bubble removal method for inkjet head, and inkjet recording apparatus |
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