CN113085391B - Ink jet printing apparatus - Google Patents
Ink jet printing apparatus Download PDFInfo
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- CN113085391B CN113085391B CN202110447246.3A CN202110447246A CN113085391B CN 113085391 B CN113085391 B CN 113085391B CN 202110447246 A CN202110447246 A CN 202110447246A CN 113085391 B CN113085391 B CN 113085391B
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- 238000007641 inkjet printing Methods 0.000 title claims abstract description 54
- 238000007639 printing Methods 0.000 claims abstract description 104
- 239000007788 liquid Substances 0.000 claims abstract description 79
- 239000002904 solvent Substances 0.000 claims abstract description 64
- 238000001514 detection method Methods 0.000 claims abstract description 16
- 239000012530 fluid Substances 0.000 claims abstract description 15
- 230000001276 controlling effect Effects 0.000 claims description 9
- 230000001105 regulatory effect Effects 0.000 claims description 2
- 238000005507 spraying Methods 0.000 claims description 2
- 238000000034 method Methods 0.000 description 8
- 238000010438 heat treatment Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000011368 organic material Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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Classifications
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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
- B41J3/00—Typewriters or selective printing or marking mechanisms characterised by the purpose for which they are constructed
- B41J3/407—Typewriters or selective printing or marking mechanisms characterised by the purpose for which they are constructed for marking on special material
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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—Prevention or detection 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
- B41J2/005—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—Prevention or detection of nozzle clogging, e.g. cleaning, capping or moistening for nozzles
- B41J2/16579—Detection means therefor, e.g. for nozzle clogging
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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
- B41J2/175—Ink supply systems ; Circuit parts therefor
- B41J2/17566—Ink level or ink residue control
Landscapes
- Ink Jet (AREA)
Abstract
The application discloses inkjet printing apparatus for printing an organic light emitting device, the inkjet printing apparatus includes: the ink-jet device comprises an ink-jet unit, an ink supply unit, a liquid supply unit, a negative pressure unit and a control unit; the ink supply unit is in fluid connection with the ink jet unit and is used for supplying storage ink to the ink jet unit; the liquid supply unit is in fluid connection with the ink jet unit and is used for supplying a solvent to the ink jet unit; the negative pressure unit is in fluid connection with the ink jet unit and is used for providing negative pressure for the ink jet unit; the ink jet unit is used for accommodating ink formed by mixing storage ink and a solvent and controlling the printing of the printing ink; the control unit is used for controlling the supply of the stored ink and the solvent according to the detection value of the ink jet unit.
Description
Technical Field
The application relates to the technical field of panel manufacturing, in particular to an ink-jet printing device.
Background
The trend of organic light-Emitting Diode (OLED) manufacture is moving toward inkjet printing, but in inkjet printing, the ink cartridge needs to be filled with ink to be added as new printing ink.
In the printing process of the ink-jet printing device or in the standby process of the ink-jet printing device, a negative pressure process needs to be carried out on printing ink so as to avoid the phenomenon of liquid leakage caused by the dropping of the printing ink from a nozzle. If the negative pressure of the printing ink is too high, the printing ink is drained, the viscosity of the printing ink is increased, and the phenomenon of blocking the nozzle in subsequent printing can be caused. If the negative pressure to the printing ink is too low or not, the printing ink may leak from the head due to weight, resulting in ink leakage, loss of printing ink, and increased cost.
It is desirable to provide a new inkjet printing apparatus to solve the problem of ink leakage or nozzle clogging.
Disclosure of Invention
The application provides an ink jet printing device to prevent ink leakage or nozzle blockage of the ink jet printing device.
An embodiment of the present application provides an inkjet printing apparatus for printing an organic light emitting device, the inkjet printing apparatus including: the ink supply unit is in fluid connection with the ink jet unit and is used for providing storage ink for the ink jet unit; the liquid supply unit is in fluid connection with the ink jet unit and is used for supplying a solvent to the ink jet unit; the negative pressure unit is in fluid connection with the ink jet unit and is used for providing negative pressure for the ink jet unit; the ink jet unit is used for accommodating printing ink formed by mixing the stored ink and the solvent and controlling the printing ink to print; the control unit is used for controlling the replenishment of the stored ink and the solvent according to the detection value of the ink jet unit.
Optionally, in some embodiments of the present application, the inkjet printing apparatus comprises: the ink supply unit supplies the storage ink to the ink jet unit through the ink supply pipeline; a liquid supply conduit through which the liquid supply unit supplies the solvent to the inkjet unit; the negative pressure unit provides negative pressure to the ink jet unit through the negative pressure pipeline.
Optionally, in some embodiments of the present application, the inkjet printing apparatus comprises: and the air valve is arranged on the negative pressure pipeline, is positioned between the negative pressure unit and the ink jet unit, is electrically connected with the control unit and is used for adjusting the negative pressure state in the ink jet unit.
Optionally, in some embodiments of the present application, the inkjet printing apparatus further comprises: the pressure sensor is used for detecting a negative pressure value in the ink jet unit; a density sensor for detecting a density value of the printing ink contained in the ink jet unit; the liquid supply valve is arranged on the liquid supply pipeline, is positioned between the liquid supply unit and the ink jet unit, is electrically connected with the control unit and is used for adjusting the supply of the solvent; the control unit is electrically connected with the pressure sensor, and is used for controlling the liquid supply unit to supply the solvent to the ink jet unit through the liquid supply valve based on the negative pressure value provided by the pressure sensor and the concentration value of the printing ink detected by the concentration sensor.
Optionally, in some embodiments of the present application, the inkjet printing apparatus further comprises: an ink leakage detector for detecting ink leakage from the ink ejection unit; the ink supply valve is arranged on the ink supply pipeline, is positioned between the ink supply unit and the ink jet unit, is electrically connected with the control unit and is used for regulating the supply of the stored ink; the control unit is electrically connected with the ink leakage detector, so that the ink supply unit is controlled to supply the storage ink to the ink jet unit through the ink supply valve based on the detection signal provided by the ink leakage detector and the negative pressure value provided by the pressure sensor.
Optionally, in some embodiments of the present application, the inkjet unit comprises a print cartridge for containing the printing ink; the ink supply unit comprises a storage ink box for containing the storage ink, and the storage ink box is in fluid connection with the printing ink box through the ink supply pipeline; the liquid supply unit comprises a solvent box used for containing the solvent, and the solvent box is in fluid connection with the printing ink box through the liquid supply pipeline.
Optionally, in some embodiments of the present application, the inkjet unit further includes a nozzle for spraying the printing ink, one end of the nozzle is disposed on the printing cartridge and fluidly connected to the printing cartridge, and one end of the nozzle away from the printing cartridge is opened with at least one opening.
Optionally, in some embodiments of the present application, a liquid level sensor is disposed in the inkjet unit, and electrically connected to the control unit, so as to transmit a liquid level height value of the printing ink back to the control unit.
Optionally, in some embodiments of the present application, the inkjet printing device further comprises a thermostatic structure disposed on an inner wall of any of the print cartridge, the storage cartridge, and the solvent cartridge.
Optionally, in some embodiments of the present application, a volume of any one of the print cartridge, the storage cartridge, and the solvent cartridge ranges from 25ml to 500 ml.
The inkjet printing apparatus provided in the embodiment of the present application, the control unit is configured to, according to a detection value of the inkjet unit, include: the negative pressure value, the concentration value of the printing ink and the detection signal of ink leakage of the ink jet unit are used for controlling the ink supply unit to automatically supply the ink to the ink jet unit for storing the ink and controlling the liquid supply unit to automatically supply the ink to the ink jet unit for supplying the solvent.
The ink-jet unit is used for ensuring that the concentration of the printing ink contained in the ink-jet unit is maintained at a concentration set value.
In addition, this application inkjet printing device still includes the constant temperature structure, set up in the printing ink horn of inkjet unit, the storage ink horn of ink supply unit and supply on the inner wall of any one of the solvent box of liquid unit makes the molecule of the inside solution in any one of printing ink, storage ink and the solvent is in the hot motion state in order to carry out continuous flow, provides the molecule mobility, avoids printing ink, storage ink and the inside clustering phenomenon that takes place of the solution in any one of solvent.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an inkjet printing apparatus according to an embodiment of the present application.
Description of reference numerals:
100. an ink jet unit; 200. an ink supply unit;
300. a liquid supply unit; 400. a negative pressure unit;
500. a control unit; 600. an ink supply conduit;
700. a liquid supply conduit; 800. a negative pressure pipeline;
110. printing the ink box; 120. a spray head;
210. storing the ink cartridge; 310. a solvent cartridge;
410. a pump; 900. A constant temperature structural member;
510. a pressure sensor; 520. a concentration sensor;
530. an air valve; 540. an ink supply valve;
550. a liquid supply valve; 560. an ink leakage detector;
570. a liquid level sensor.
Detailed Description
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 only a part of the embodiments of the present application, and not all of the 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 application. Furthermore, it should be understood that the detailed description and specific examples, while indicating exemplary embodiments of the invention, are given by way of illustration and explanation only, and are not intended to limit the scope of the invention. In the present application, unless indicated to the contrary, the use of the directional terms "upper" and "lower" generally refer to the upper and lower positions of the device in actual use or operation, and more particularly to the orientation of the figures of the drawings; while "inner" and "outer" are with respect to the outline of the device.
The embodiment of the application provides an ink jet printing device. It should be noted that the following description of the embodiments is not intended to limit the preferred order of the embodiments. The inkjet printing apparatus according to the present application will be described in detail below with reference to the embodiments of the present application.
Please refer to fig. 1. In an embodiment of the present invention, the inkjet printing apparatus is for printing an organic light emitting device, the inkjet printing apparatus including: the ink supply unit comprises an ink jet unit 100, an ink supply unit 200, a liquid supply unit 300, a negative pressure unit 400 and a control unit 500.
As shown in fig. 1, the ink supply unit 200 is fluidly connected to the inkjet unit 100, and is used for supplying storage ink to the inkjet unit 100; the liquid supply unit 300 is in fluid connection with the inkjet unit 100 and is used for supplying a solvent to the inkjet unit 100; the negative pressure unit 400 is fluidly connected to the inkjet unit 100, and is used for providing negative pressure to the inkjet unit 100; the inkjet unit 100 is used for accommodating printing ink formed by mixing the storage ink and the solvent, and controlling the printing ink to print, for example, to form an organic light emitting device; the control unit 500 controls the supply of the stored ink and the solvent, specifically, controls the ink supply unit 200 to automatically supply the stored ink to the inkjet unit 100, and controls the liquid supply unit 300 to automatically supply the solvent to the inkjet unit 100, according to the detection value in the inkjet unit 100.
As shown in fig. 1, the inkjet printing apparatus further includes: ink supply pipe 600, liquid supply pipe 700 and negative pressure pipe 800. Wherein the ink supply unit 200 supplies the storage ink to the inkjet unit 100 through the ink supply pipe 600; the liquid supply unit 300 supplies the solvent to the inkjet unit 100 through the liquid supply pipe 700; the negative pressure unit 400 provides a negative pressure to the inkjet unit 100 through the negative pressure duct 800.
The structures of the inkjet unit 100, the ink supply unit 200, the liquid supply unit 300, and the negative pressure unit 400 of the inkjet printing apparatus will be described in detail below with reference to fig. 1.
As shown in fig. 1, the inkjet unit 100 includes a printing cartridge 110, and the printing cartridge 110 is used for accommodating the printing ink. The inkjet unit 100 further includes a nozzle 120, one end of the nozzle 120 is disposed on the printing cartridge 110 and is in fluid connection with the printing cartridge 110, at least one opening is disposed at the other end of the nozzle 120 away from the printing cartridge 110, and the nozzle 120 sprays the printing ink through the opening.
As shown in fig. 1, the ink supply unit 200 includes a storage cartridge 210, the storage cartridge 210 is used for containing the storage ink, and the storage cartridge 210 is fluidly connected to the printing cartridge 110 of the inkjet unit 100 through the ink supply pipe 600.
As shown in fig. 1, the liquid supply unit 300 includes a solvent cartridge 310, the solvent cartridge 310 is used for accommodating the solvent, and the solvent cartridge 310 is fluidly connected to the print cartridge 110 of the inkjet unit 100 through the liquid supply pipe 700.
And as shown in fig. 1, the negative pressure unit 400 is used to provide negative pressure to the inkjet unit 100. The negative pressure unit 400 is fluidly connected to the print cartridge 110 of the inkjet unit 100 through the negative pressure conduit 800. In the embodiment of the present application, the negative pressure unit 400 is a pump 410, and the pump 410 is, for example, an air pump, and is used for applying negative pressure to the inside of the print cartridge 110 of the inkjet unit 100.
In the embodiment of the present application, it is preferable that any one of the print cartridge 110, the storage cartridge 210, and the solvent cartridge 310 has a volume ranging from 25ml to 500 ml.
Preferably, the material of any of the print cartridge 110, the storage cartridge 210, and the solvent cartridge 310 is a substance that does not react with organic materials. It is further preferred that the material of any of the print cartridge 110, the storage cartridge 210, and the solvent cartridge 310 is glass or ceramic.
In this application, the inkjet printing apparatus further includes a constant temperature structure 900 disposed on an inner wall of any one of the print cartridge 110 of the inkjet unit 100, the storage cartridge 210 of the ink supply unit 200, and the solvent cartridge 310 of the liquid supply unit 300. In a preferred embodiment, the constant temperature structural member 900 is a hollow tubular structural member, and a heating medium is filled in the hollow tubular structural member, the temperature of the heating medium is adjustable, and the temperature range of the heating medium is 25 ℃ to 50 ℃. Preferably, the heating medium may be warm water.
In the use process of the inkjet printing apparatus, the constant temperature structure 900 is configured to maintain the pipe walls of the printing cartridge 110, the storage cartridge 210, and the solvent cartridge 310 at a constant temperature higher than room temperature, so that the printing ink in the printing cartridge 110, the storage ink in the storage cartridge 210, and the solvent in the solvent cartridge 310 are maintained at a constant temperature state higher than room temperature, molecules in the printing ink, the storage ink, and the solvent are in a strong thermal motion state to continuously flow, and clustering inside the solution is avoided.
Hereinafter, the main control manner of the control unit 500 for the inkjet unit 100, the ink supply unit 200, the liquid supply unit 300, and the negative pressure unit 400 will be described in detail with reference to fig. 1 as follows.
In this embodiment, in order to realize that the control unit 500 of the inkjet printing apparatus automatically supplies the stored ink to the inkjet unit 100 by the ink supply unit 200 and automatically supplies the solvent to the inkjet unit 100 by the liquid supply unit 300 according to the detection value of the inkjet unit 100.
In this embodiment, as shown in fig. 1, the inkjet printing apparatus further includes a pressure sensor 510, a concentration sensor 520, an air valve 530, an ink supply valve 540, a liquid supply valve 550, an ink leakage detector 560, and a liquid level sensor 570. The pressure sensor 510, the concentration sensor 520, the air valve 530, the ink supply valve 540, the liquid supply valve 550, the ink leakage detector 560 and the liquid level sensor 570 are electrically connected to the control unit 500, respectively, and the control unit 500 controls any one of the air valve 530, the ink supply valve 540 and the liquid supply valve 550 to perform related actions or drive other related actions, and to issue an alarm or the like based on detection values provided by the pressure sensor 510, the concentration sensor 520, the ink leakage detector 560 and the liquid level sensor 570.
As shown in fig. 1, in the embodiment of the present application, the pressure sensor 510 is disposed in the inkjet unit 100, and the pressure sensor 510 is used for detecting a negative pressure value contained in the inkjet unit 100. The concentration sensor 520 is used for detecting the concentration of the printing ink contained in the nozzle 120 of the inkjet unit 100. The liquid supply valve 550 is disposed on the liquid supply pipe 700, and the liquid supply valve 550 is disposed between the liquid supply unit 300 and the inkjet unit 100, specifically, the liquid supply valve 550 is disposed between the solvent cartridge 310 and the print cartridge 110.
As shown in fig. 1, in the embodiment of the present application, the ink leakage detector 560 is disposed outside the head 120 of the inkjet unit 100 and is configured to detect ink leakage from the inkjet unit 100, that is, the ink leakage detector 560 is configured to detect ink leakage from the head 120 of the inkjet unit 100. Specifically, the ink leakage detector 560 is disposed on a side of the head 120 of the inkjet unit 100 facing away from the print cartridge 110. Preferably, the ink leakage detector 560 may be a liquid tray, the liquid tray is located right below the nozzle 120, and the liquid tray determines whether the nozzle 120 of the inkjet unit 100 leaks ink, and if an ink droplet drops on the liquid tray, it is equivalent to detecting ink leakage of the inkjet unit 100.
As shown in fig. 1, the ink supply valve 540 is disposed on the ink supply pipe 600, and the ink supply valve 540 is disposed between the ink supply unit 200 and the ink jet unit 100. Further, the ink supply valve 540 is disposed between the storage cartridge 210 and the print cartridge 110; the air valve 530 is disposed on the negative pressure pipeline 800, and the air valve 530 is located between the negative pressure unit 400 and the inkjet unit 100. Further, the gas valve 530 is disposed between the pump 410 and the print cartridge 110. Preferably, any one of the air valve 530, the ink supply valve 540, and the liquid supply valve 550 is a solenoid valve. Any of the solenoid valves may be in an open state or a closed state.
As shown in fig. 1, in the embodiment of the present application, the ink leakage detector 560 is electrically connected to the control unit 500, the ink leakage detector 560 is configured to detect ink leakage of the inkjet unit 100, and the control unit 500 is configured to obtain a detection signal provided by the ink leakage detector 560. The control unit 500 controls the ink supply unit 200 to supply the ink to the inkjet unit 100 through the ink supply valve as printing ink based on the detection signal of ink leakage of the inkjet unit 100 provided by the ink leakage detector 560 and based on the negative pressure value in the inkjet unit 100 provided by the pressure sensor 510. Scale marks (not shown) are provided on the outer circumferential surface of the head 120, and the scale marks are used for confirming the amount of the printing ink that needs to be added by the head 120.
Optionally, in some embodiments of the present application, a liquid level sensor 570 is disposed in the inkjet unit 100 for transmitting a liquid level height value of the printing ink back to the control unit 500.
In this embodiment, when the inkjet unit 100 is in the non-operating state, the air valve 530, the ink supply valve 540 and the liquid supply valve 550 are all in the open state to maintain the negative pressure state in the print cartridge 110. However, in order to avoid unexpected situations, when the pressure sensor 510 detects that the negative pressure value in the inkjet unit 100 does not match the set negative pressure value, the control unit 500 controls the pump 410 of the negative pressure unit 400 to be in an operation mode, and applies a negative pressure to the print cartridge 110 through the air valve 530, so as to prevent ink leakage from the nozzle 120. In this process, the air valve 530 is temporarily closed to provide the negative pressure operation to the inkjet unit 100 by the negative pressure unit 400, so that the inkjet head 120 does not leak or drip ink through the opening when the inkjet unit 100 is not operating.
In addition, when the inkjet unit 100 is in a normal operating state, the air valve 530 is also switched between a closed state and an open state, that is, the negative pressure unit 400 is in an operating mode to provide a proper negative pressure in the inkjet unit 100.
This corresponds to a process of applying a negative pressure to the print cartridge 110 of the inkjet printing apparatus during printing of the inkjet printing apparatus or during standby of the inkjet printing apparatus.
The nozzle 120 is used to overcome the negative pressure in the inkjet unit 100 and control the printing ink to be ejected from the opening.
In the embodiment of the present application, no matter the inkjet printing apparatus is in a printing process or in a standby state, the negative pressure unit 400 is used to keep the inkjet unit 100 in a negative pressure state all the time, and the negative pressure unit 400 has a negative pressure set value for the negative pressure value in the inkjet unit 100; also, the density value of the printing ink in the ink jet unit 100 has a density set value. In this application, the control unit 500 controls the inkjet printing apparatus to be in a preset state, and in this preset state, the control unit 500 controls the negative pressure value in the inkjet unit 100 to be maintained at the negative pressure set value, and the concentration value of the printing ink contained in the inkjet unit 100 to be maintained at the concentration set value. The negative pressure set value is a fixed value, and the concentration set value is a fixed value.
When the ink leakage detector 560 detects that the nozzle 120 leaks ink, or when the pressure sensor 510 detects that the negative pressure value in the inkjet unit 100 does not match the negative pressure set value, the control unit 500 controls the ink supply unit 200 to automatically replenish the stored ink to the inkjet unit 100 through the ink supply valve 540 based on the detection signal of ink leakage of the nozzle 120 provided by the ink leakage detector 560 and the negative pressure value provided by the pressure sensor 510, so as to maintain the concentration value of the printing ink in the inkjet unit 100 at the concentration set value.
Specifically, in the embodiment of the present application, in order to automatically replenish the stored ink to the inkjet unit 100 as new printing ink when the inkjet head 120 of the inkjet unit 100 leaks ink or the printing ink is automatically lost, the control unit 500 controls the ink supply unit 200 to automatically replenish the stored ink to the printing cartridge 110 of the inkjet unit 100 as new printing ink through the ink supply valve 540 based on the detection signal of ink leakage of the inkjet head 120 provided by the ink leakage detector 560 and the negative pressure value provided by the pressure sensor 510, so that the ink amount of the printing ink contained in the printing cartridge 110 and the inkjet head 120 maintains a set value, and the ink supply valve 540 is in a closed state.
The control unit 500 may also determine to replenish the stored ink or the solvent based on the detected value of the liquid level sensor 570 and the density value of the printing ink provided by the density sensor 520 when the negative pressure value provided by the pressure sensor 510 is higher than the set negative pressure value (i.e., when the air pressure of the printing cartridge 110 is lower than the set air pressure value).
Specifically, if the detected value provided by the level sensor 570 is a low level and the density value of the printing ink provided by the density sensor 520 is maintained at a set value. The ink supply unit 200 is controlled to supply the stored ink to the inkjet unit 100 as new printing ink by the ink supply valve 540 being in a closed state.
Specifically, if the detected value provided by the liquid level sensor 570 is a high level and the density value of the printing ink provided by the density sensor 520 is higher than a set value, the printing ink is printed. The control unit 500 controls the liquid supply unit 300 to automatically replenish the solvent to the inkjet unit 100 through the liquid supply valve 550 so as to maintain the concentration value of the printing ink in the inkjet unit 100 at the concentration set value. Specifically, in the embodiment of the present application, if the negative pressure in the inkjet unit 100 is too high and the solvent in the printing ink of the inkjet unit 100 is likely to volatilize, the control unit 500 controls the liquid supply unit 300 to automatically replenish the solvent to the inkjet unit 100 so that the concentration value of the printing ink in the printing ink cartridge 110 of the inkjet unit 100 maintains the concentration set value.
In order to realize that the control unit 500 controls the liquid supply unit 300 to automatically supply the solvent to the inkjet unit 100, the control unit 500 controls the liquid supply unit 300 to automatically supply the solvent to the inkjet unit 100 through the liquid supply valve 550 based on the negative pressure value provided by the pressure sensor 510 and the concentration value of the printing ink provided by the concentration sensor 520, so that the printing ink originally contained in the nozzle 120 and the new solvent are fully mixed to form new printing ink, and the concentration value of the printing ink in the printing ink cartridge 110 of the inkjet unit 100 is always the concentration set value.
The inkjet printing device provided by the embodiment of the application comprises an inkjet unit 100, an ink supply unit 200, a liquid supply unit 300, a negative pressure unit 400, a control unit 500, a pressure sensor 510, a concentration sensor 520, an air valve 530, an ink supply valve 540, a liquid supply valve 550, an ink leakage detector 560 and a constant temperature structure 900. The ink supply unit 200 is configured to provide stored ink to the inkjet unit 100, the liquid supply unit 300 is configured to provide a solvent to the inkjet unit 100, the negative pressure unit 400 is configured to provide negative pressure to the inkjet unit 100, the inkjet unit 100 is configured to accommodate printing ink formed by mixing the stored ink and the solvent and control printing of the printing ink, and the control unit 500 is configured to control the ink supply unit 200 to automatically supply the stored ink to the inkjet unit 100 and control the liquid supply unit 300 to automatically supply the solvent to the inkjet unit 100 based on a detection value in the inkjet unit 100. The pressure sensor 510 is configured to detect a negative pressure value in the inkjet unit 100, the concentration sensor 520 is configured to detect a concentration of the printing ink contained in the inkjet unit 100, and the ink leakage detector 560 is configured to detect ink leakage from the inkjet unit 100; when ink leakage occurs in the inkjet unit 100 or the printing ink is consumed, the control unit 500 may control the ink supply unit 200 to automatically replenish the stored ink to the inkjet unit 100 according to the detection signal provided by the ink leakage detector 560 and the negative pressure value provided by the pressure sensor 510, so as to replenish the printing ink of the inkjet unit 100; when the negative pressure in the inkjet unit 100 is too high, the control unit 500 controls the liquid supply unit 300 to automatically replenish the solvent to the inkjet unit 100 according to the negative pressure value provided by the pressure sensor 510 and the concentration value provided by the concentration sensor 520, so that the original printing ink in the inkjet unit 100 and the newly replenished solvent are fully mixed to form new printing ink, thereby ensuring that the concentration of the printing ink contained in the inkjet unit 100 is not changed, and ensuring that the concentration value of the printing ink contained in the inkjet unit 100 detected by the concentration sensor 520 is the concentration set value. And when the ink jet printing device is in printing or standby, the negative pressure unit 400 is in a working state to apply negative pressure to the ink jet unit 100 so as to prevent ink leakage at the nozzle 120 of the ink jet unit 100. In addition, the constant temperature structure 900 is disposed on an inner wall of any one of the printing cartridge 110 of the inkjet unit 100, the storage cartridge 210 of the ink supply unit 200, and the solvent cartridge 310 of the liquid supply unit 300, so that molecules in any one of the printing ink, the storage ink, and the solvent are in a strong thermal motion state to flow continuously, thereby providing molecular mobility and preventing clustering in any one of the printing ink, the storage ink, and the solvent.
The foregoing detailed description is directed to an inkjet printing apparatus provided in the embodiments of the present application, and the principles and embodiments of the present application are described herein using specific examples, which are provided only to help understand the method and the core concept of the present application; meanwhile, for those skilled in the art, according to the idea of the present application, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present application.
Claims (9)
1. An inkjet printing apparatus for printing an organic light emitting device, the inkjet printing apparatus comprising: an ink jet unit, an ink supply unit, a liquid supply unit, a negative pressure unit and a control unit, wherein,
the ink supply unit is in fluid connection with the ink jet unit and is used for supplying storage ink to the ink jet unit;
the liquid supply unit is in fluid connection with the ink jet unit and is used for supplying a solvent to the ink jet unit;
the negative pressure unit is in fluid connection with the ink jet unit and is used for providing negative pressure for the ink jet unit;
the ink jet unit is used for accommodating printing ink formed by mixing the stored ink and the solvent and controlling the printing ink to print;
the control unit is used for controlling the replenishment of the stored ink and the solvent according to the detection value of the ink jet unit;
the inkjet printing apparatus further includes:
a liquid supply conduit through which the liquid supply unit supplies the solvent to the inkjet unit;
the pressure sensor is used for detecting a negative pressure value in the ink jet unit;
a density sensor for detecting a density value of the printing ink contained in the ink jet unit;
the liquid supply valve is arranged on the liquid supply pipeline, is positioned between the liquid supply unit and the ink jet unit, is electrically connected with the control unit and is used for adjusting the supply of the solvent;
the control unit is electrically connected with the pressure sensor, and is used for controlling the liquid supply unit to supply the solvent to the ink jet unit through the liquid supply valve based on the negative pressure value provided by the pressure sensor and the concentration value of the printing ink detected by the concentration sensor.
2. Inkjet printing apparatus according to claim 1, wherein the inkjet printing apparatus comprises:
the ink supply unit supplies the storage ink to the ink jet unit through the ink supply pipeline;
the negative pressure unit provides negative pressure to the ink jet unit through the negative pressure pipeline.
3. The inkjet printing apparatus as defined in claim 2 wherein the inkjet printing apparatus further comprises:
and the air valve is arranged on the negative pressure pipeline, is positioned between the negative pressure unit and the ink jet unit, is electrically connected with the control unit and is used for adjusting the negative pressure in the ink jet unit.
4. Inkjet printing apparatus according to claim 3, wherein the inkjet printing apparatus further comprises:
an ink leakage detector for detecting ink leakage from the ink ejection unit;
the ink supply valve is arranged on the ink supply pipeline, is positioned between the ink supply unit and the ink jet unit, is electrically connected with the control unit and is used for regulating the supply of the stored ink;
the control unit is electrically connected with the ink leakage detector, so that the ink supply unit is controlled to supply the storage ink to the ink jet unit through the ink supply valve based on the detection signal provided by the ink leakage detector and the negative pressure value provided by the pressure sensor.
5. Inkjet printing apparatus according to claim 2,
the ink jet unit comprises a printing ink box for containing the printing ink;
the ink supply unit comprises a storage ink box for containing the storage ink, and the storage ink box is in fluid connection with the printing ink box through the ink supply pipeline;
the liquid supply unit comprises a solvent box used for containing the solvent, and the solvent box is in fluid connection with the printing ink box through the liquid supply pipeline.
6. The inkjet printing apparatus of claim 5, wherein the inkjet unit further comprises a nozzle for spraying the printing ink, wherein an end of the nozzle is disposed on and fluidly connected to the print cartridge, and wherein an end of the nozzle facing away from the print cartridge defines at least one opening.
7. The inkjet printing apparatus as claimed in claim 6, wherein a liquid level sensor is disposed in the inkjet unit and electrically connected to the control unit for transmitting a liquid level height of the printing ink back to the control unit.
8. The inkjet printing apparatus of claim 5, further comprising a thermostatic structure disposed on an interior wall of any of the print cartridge, the storage cartridge, and the solvent cartridge.
9. The inkjet printing apparatus of claim 5, wherein a volume of any one of the print cartridge, the storage cartridge, and the solvent cartridge ranges from 25ml to 500 ml.
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| CN114103473B (en) * | 2021-11-22 | 2023-04-18 | Tcl华星光电技术有限公司 | Ink jet printing apparatus and ink jet printing method |
| CN115027142B (en) * | 2022-05-16 | 2023-03-31 | 深圳汉弘软件技术有限公司 | Ink supply method, printing control module, ink path negative pressure control system and ink-jet printer |
| CN116174650B (en) * | 2023-04-24 | 2023-07-18 | 冀凯河北机电科技有限公司 | Negative pressure ink jet control method, system, equipment and storage medium |
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