CN107379804B - Large-area high-uniformity film ink-jet printing method and printing system - Google Patents
Large-area high-uniformity film ink-jet printing method and printing system Download PDFInfo
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- CN107379804B CN107379804B CN201710642526.3A CN201710642526A CN107379804B CN 107379804 B CN107379804 B CN 107379804B CN 201710642526 A CN201710642526 A CN 201710642526A CN 107379804 B CN107379804 B CN 107379804B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M5/00—Duplicating or marking methods; Sheet materials for use therein
- B41M5/0041—Digital printing on surfaces other than ordinary paper
- B41M5/0047—Digital printing on surfaces other than ordinary paper by ink-jet printing
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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
- B41J2/05—Ink jet characterised by the jet generation process generating single droplets or particles on demand by pressure, e.g. electromechanical transducers produced by the application of heat
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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
- B41J2/07—Ink jet characterised by jet control
- B41J2/072—Ink jet characterised by jet control by thermal compensation
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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
- B41J2/07—Ink jet characterised by jet control
- B41J2/11—Ink jet characterised by jet control for ink spray
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M5/00—Duplicating or marking methods; Sheet materials for use therein
- B41M5/0011—Pre-treatment or treatment during printing of the recording material, e.g. heating, irradiating
Abstract
The invention relates to a large-area high-uniformity thin film ink-jet printing method, which comprises the following steps of firstly, cleaning and drying a substrate: placing the substrate in a cleaning solution, cleaning the substrate by ultrasonic oscillation, and drying the substrate after cleaning; secondly, film printing: setting printing parameters and graphs, printing on the cleaned and dried substrate by adopting a non-contact point-spraying printing system, heating the lower part of the substrate while printing, and adopting low-temperature gelled ink as printing ink: finally, drying the film: and continuously heating the lower part of the substrate to dry the film. Compared with the prior art, the invention solves the problem of poor uniformity when large-area films are printed by ink-jet. The invention adopts a mode of heating the printing substrate on the basis of considering the coffee ring effect of a single liquid drop, so that the printing liquid drop forms a gelled edge area while printing, and the large amount of fluid flowing among the liquid drops is prevented, thereby realizing the integral uniformity of the printing film.
Description
Technical Field
The invention relates to the field of printed electronic device preparation, in particular to a large-area high-uniformity thin film ink-jet printing method and a printing system.
Background
In the existing technology for controlling the appearance of the ink-jet printing film, the appearance of a dried droplet is changed as shown in figure 1 based on the inhibition of the coffee ring effect of a single droplet. Under the premise of three-phase line pinning of the liquid drop, the evaporation amount of the solvent at the edge of the liquid drop is much larger than the loss amount of the liquid volume of the liquid drop, so that the solvent is supplemented from the central area to the edge to form outward capillary flow, and the solute is gathered at the edge to form a coffee ring. The regulation and control ways are various, including inhibiting and eliminating 'coffee rings' in each process of formation by changing the components of the ink and the state of the substrate and adding special equipment. (a) Regulating and controlling the chemistry and composition of the ink, such as adding a surfactant, dodecyl mercaptan, a high-boiling point low-surface tension solvent, a polymer gel, and even changing the shape of a solute; (b) Substrate processing, such as surface hydrophobization, substrate cooling (17 ℃), pre-patterning and electrowetting; (c) Auxiliary equipment such as an evaporation shield with micro-holes and a capillary tip immersed in the droplet; (d) Fast curing, such as by photonic sintering techniques, with curing times on the order of milliseconds or even microseconds.
For non-contact ink-jet printing, the viscosity of the ink is low, so that the controlled printing pattern morphology is limited to points and lines by aiming at a single-drop coffee ring effect inhibition method. For a large-size printed film composed of multiple droplets, the boundary limitation of fluid flow due to three-phase lines between droplets is absent, as shown in fig. 2, so that solute and solvent transmission among droplets in the drying process becomes the most main factors causing the final appearance of the film, and the non-uniform appearance without a coffee ring is obtained finally as shown in fig. 3. This non-uniform morphology is manifested in two ways: (1) unevenness in film thickness; (2) non-uniformity of the concentration of the functional material in the local region.
Furthermore, not all of the "coffee ring" modulation methods can be used for multi-drop combinatorial designs, as it is more difficult to print suitable patterns on hydrophobic or low surface energy substrates. In the application of the invention, the problem of large-area printing nonuniformity is effectively improved by comprehensively considering the ink-jet printing condition besides the control of the coffee ring effect. Due to solute transmission among liquid drops, the method for regulating and controlling the uniformity of the film after single liquid drop drying is difficult to be directly applied to large-area film ink-jet printing.
Disclosure of Invention
Aiming at the technical problems in the prior art, one of the purposes of the invention is as follows: the large-area high-uniformity thin film ink-jet printing method is provided, starts from inhibiting solute transmission among liquid drops, considers the drying morphology of a single liquid drop, and finally realizes large-area uniform thin film ink-jet printing by adopting an ink gelation mode in the printing process.
Aiming at the technical problems in the prior art, the second purpose of the invention is as follows: a printing system adopted by the large-area high-uniformity thin film ink-jet printing method is provided to perform large-area high-uniformity thin film ink-jet printing.
In order to achieve the purpose, the invention adopts the following technical scheme:
a large-area high-uniformity thin film ink-jet printing method comprises the following steps of firstly, cleaning and drying a substrate: placing the substrate in a cleaning solution, cleaning the substrate by ultrasonic oscillation, and drying the substrate after cleaning;
secondly, thin film printing: setting printing parameters and graphs, printing on the cleaned and dried substrate by adopting a non-contact point-spraying printing system, heating the lower part of the substrate while printing, and adopting low-temperature gelled ink as printing ink:
finally, drying the film: and continuously heating the lower part of the substrate to dry the film.
Wherein the low-temperature gelation ink solvent has boiling point of 150-200 deg.C, viscosity of 6-10cP, surface tension of 20-30 dyn/cm, and sintering temperature of 120-200 deg.C. The gelation temperature is 80-90 deg.C, and can be filtered through 0.22-0.45 μm filter head.
Wherein, the heating temperature of the substrate is 50-60 ℃ and the temperature of the spray head is 30-60 ℃ during printing.
When the preset graph is square, a printing method that ink lines are printed line by line and adjacent ink lines are connected is adopted.
The substrate cleaning and drying steps specifically comprise the steps of sequentially placing the substrate in a plurality of cleaning agents, respectively oscillating for 5-10min by adopting an ultrasonic cleaner, and drying for later use.
A printing system adopted by the large-area high-uniformity thin film ink-jet printing method comprises a substrate placing position and a nozzle, wherein the nozzle is positioned above the substrate placing position, and a heating device is further arranged below the substrate placing position.
The printing system further comprises a printing control device, a liquid drop control device, a movement control device and a heating control device, wherein the printing control device controls the liquid drop control device and the movement control device, the liquid drop control device controls the nozzle, the movement control device controls the substrate placing position and the heating device to move together, and the heating control device controls the temperature of the heating device
In general, the present invention has the following advantages:
compared with the prior art, the invention provides the large-area high-uniformity film ink-jet printing method, and solves the problem of poor uniformity when large-area films are printed by ink-jet printing. The invention adopts a mode of heating the printing substrate on the basis of considering the coffee ring effect of a single liquid drop, so that the printing liquid drop forms a gelled edge area while printing, and the large amount of fluid among the liquid drops is prevented from flowing, thereby realizing the integral uniformity of the printing film. In this process, the selected gellable inks are characterized by a suppressed "coffee ring" effect as the temperature increases during evaporation, so that the substrate heats up while simultaneously contributing to the topographical control of its individual droplets.
A heating device and a heating control device for controlling the temperature of the heating device are arranged below a substrate placing position, and the heating temperature is controlled to be suitable for ink during printing, so that the large-area high-uniformity film can be printed conveniently.
Drawings
FIG. 1 is a schematic cross-sectional view of a single droplet dried in the coffee ring effect.
Figure 2 distinguishes single-drop from multi-drop fluid flow.
FIG. 3 is an electron microscope photograph of the surface topography of a printed square film without the coffee ring effect.
FIG. 4 is a schematic diagram of a printing system for large-area high-uniformity thin film inkjet printing according to the present invention.
Figure 5 schematic diagram of single inkjet printing drop gelation of the present invention.
FIG. 6 is a schematic view of two adjacent drops perpendicular to the print direction of travel according to the present invention.
FIG. 7 is an electron micrograph of the surface topography of a large area square thin film printed by the printing method of the present invention.
Wherein, fig. 4 includes:
a print control device 1, a droplet control device 2, a movement control device 3, a heating control device 4, a nozzle 5, a substrate 6, and a heating device 7.
Fig. 5 and 6 include:
partially gelled droplets 8, fully gelled regions 9, ungelled droplets 10.
Detailed Description
The present invention will be described in further detail below.
A large-area high-uniformity thin film ink-jet printing method comprises the following steps of firstly, cleaning and drying a substrate: and placing the substrate in a cleaning solution, cleaning the substrate by adopting ultrasonic oscillation, and drying the substrate after cleaning. Secondly, thin film printing: setting printing parameters and graphs, printing on the cleaned and dried substrate by using a non-contact point-jet printing system, heating the lower part of the substrate while printing, and using low-temperature gelled ink as printing ink. Finally, drying the film: and continuously heating the lower part of the substrate to dry the film. The low temperature gelation ink solvent has boiling point of 150-200 deg.C, viscosity of 6-10cP, surface tension of 20-30 dyn/cm, and sintering temperature of 120-200 deg.C. The gelation temperature is 80-90 deg.C, and can be filtered through 0.22-0.45 μm filter head. When printing, the heating temperature of the substrate is 50-60 ℃, and the temperature of the spray head is 30-60 ℃. When the preset graph is square, a printing method that ink lines are printed line by line and adjacent ink lines are connected is adopted. The substrate cleaning and drying steps specifically comprise the steps of sequentially placing the substrate in a plurality of cleaning agents, respectively oscillating for 5-10min by adopting an ultrasonic cleaner, and drying for later use.
As shown in fig. 5, a single inkjet printed droplet is shown in an intermediate state before gelation occurs, referred to as a partially gelled droplet 8. In the figure, a substrate 8 is kept at a constant temperature of 50-60 ℃ in the process of droplet ink-jet printing and drying, and two sides of the substrate are provided with complete gelation areas 9 of droplets. The gelation of the liquid drop needs the solute to reach the gel concentration c, the solvent evaporation rate in the edge area of the liquid drop is high under the heating condition of the substrate 8, the solute quickly reaches the gel concentration, the flow in the edge area is stopped, and the fluid is prevented from migrating from the center position to the edge position of the liquid drop. Under the action of the mechanism, three favorable conditions for large-area high-uniformity thin film ink-jet printing are generated: (1) The "coffee ring" effect of the gellable ink is suppressed as the temperature increases during evaporation, so that the substrate 8 heats up while facilitating the topographical control of its individual droplets; (2) After the liquid drops are completely gelatinized by the gelatinization, the solute concentration of each part is close to that of the gel, so that the uniformity of the solute concentration is ensured; (3) The droplets gel progressively from the edge locations to the central location, such that fluid between adjacent droplets is largely blocked by the boundary, while a small portion of the fluid flow remains for repair of the boundary region.
As shown in fig. 6, which is a schematic view of two adjacent droplets perpendicular to the print travel direction, a substrate 8, a partially gelled droplet 8, a fully gelled region 9 of the partially gelled droplet 8; the next droplet is the droplet ejected thereafter, which is the ungelled droplet 10. This condition occurs when the next droplet is just in contact with the substrate 8 and reaches an equilibrium condition, at which point the fully gelled region 9 acts to inhibit fluid flow between adjacent droplets, but a small portion of the fluid flow remains for repair of the boundary region; the temperature of the substrate 8 is kept constant at 50-60 ℃, if the temperature is too low, the edge of the former drop is not fully gelatinized after the latter drop contacts the substrate, and if the temperature is too high, the thickness of the former drop after the gelation is small, so that the optimal temperature is when the flow is cut off and the boundary between drops is flat.
An 8cm x 8cm square film was ink-jet printed on a glass substrate using gellable inks according to the above process steps, as shown in figure 7. The 3D surface morphology picture shows that the thickness uniformity of the printed film is high.
As shown in fig. 4, a printing system used in the large-area high-uniformity thin film inkjet printing method includes a substrate placing position and a nozzle 5, wherein the nozzle 5 is located above the substrate placing position, and a heating device is further disposed below the substrate placing position. The printing system further comprises a printing control device 1, a liquid drop control device 2, a movement control device 3 and a heating control device 4, wherein the printing control device 1 controls the liquid drop control device 2 and the movement control device 3, the liquid drop control device 2 controls a nozzle 5, the movement control device 3 controls a substrate placing position and the heating device to move together, and the heating control device 4 controls the temperature of the heating device.
In summary, the present invention has the following advantages:
compared with the prior art, the large-area high-uniformity film ink-jet printing method solves the problem of poor uniformity in ink-jet printing of large-area films. The invention adopts a mode of heating the printing substrate on the basis of considering the coffee ring effect of a single liquid drop, so that the printing liquid drop forms a gelled edge area while printing, and the large amount of fluid flowing among the liquid drops is prevented, thereby realizing the integral uniformity of the printing film. In this process, the selected gellable inks are characterized by the "coffee ring" effect being suppressed as the temperature increases during evaporation, and the individual droplets having the appearance shown in FIG. 3, so that heating of the substrate simultaneously facilitates the topographical control of the individual droplets.
The utility model provides a printing system that large tracts of land high homogeneity film inkjet printed, sets up heating device and the heating control device 4 of control heating device temperature below the position is placed to the base plate, and the control heating temperature is the suitable temperature of ink when printing, is convenient for print large tracts of land high homogeneity film.
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such changes, modifications, substitutions, combinations, and simplifications are intended to be included in the scope of the present invention.
Claims (6)
1. A large area high uniformity thin film ink jet printing system, comprising: the device comprises a substrate placing position and a nozzle, wherein the nozzle is positioned above the substrate placing position, and a heating device is also arranged below the substrate placing position;
placing the substrate in a cleaning solution, cleaning the substrate by ultrasonic oscillation, and drying the substrate after cleaning; setting printing parameters and graphs, printing on the cleaned and dried substrate, heating the lower part of the substrate while printing, and adopting low-temperature gelled ink as printing ink; and continuously heating the lower part of the substrate to dry the film.
2. The printing system of claim 1, wherein: the low-temperature gelation ink solvent has boiling point of 150-200 deg.C, viscosity of 6-10cP, surface tension of 20-30 dyn/cm, sintering temperature of 120-200 deg.C, gelation temperature of 80-90 deg.C, and filtering with 0.22-0.45 μm filter head.
3. The printing system of claim 1, wherein: the heating temperature of the substrate is 50-60 ℃ and the temperature of the spray head is 30-60 ℃ during printing.
4. The printing system of claim 1, wherein: when the preset graph is square, the ink lines are printed line by line, and the adjacent ink lines are connected.
5. The printing system of claim 1, wherein: placing the substrate in a cleaning solution, cleaning the substrate by ultrasonic oscillation, and drying the substrate after cleaning; the method specifically comprises the following steps: and sequentially placing the substrates in a plurality of cleaning agents, respectively oscillating for 5-10min by adopting an ultrasonic cleaner, and drying for later use.
6. The printing system of claim 1, wherein: the printing control device controls the liquid drop control device and the movement control device, the liquid drop control device controls the nozzle, the movement control device controls the substrate placing position and the heating device to move together, and the heating control device controls the temperature of the heating device.
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| CN201710642526.3A CN107379804B (en) | 2017-07-31 | 2017-07-31 | Large-area high-uniformity film ink-jet printing method and printing system |
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| CN201710642526.3A CN107379804B (en) | 2017-07-31 | 2017-07-31 | Large-area high-uniformity film ink-jet printing method and printing system |
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| CN107379804B true CN107379804B (en) | 2023-01-06 |
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Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108001062A (en) * | 2017-12-05 | 2018-05-08 | 华南理工大学 | It is a kind of to repair the excessive method of large area high uniformity inkjet printing film surface fluctuating |
| CN110894380A (en) * | 2018-09-12 | 2020-03-20 | 广州精陶机电设备有限公司 | Printing ink, preparation method thereof and printer |
| CN109435494B (en) * | 2018-10-18 | 2021-04-09 | 厦门理工学院 | Film forming method, film forming apparatus and control method capable of controlling coffee ring effect |
| CN111361289B (en) * | 2018-12-26 | 2021-09-03 | Tcl科技集团股份有限公司 | Ink-jet printing base station and ink-jet printing method |
| CN111137013B (en) * | 2020-01-09 | 2020-12-25 | 深圳市华星光电半导体显示技术有限公司 | Inkjet printing method, inkjet printing apparatus, inkjet printing device, and computer-readable storage medium |
| CN113492607B (en) * | 2020-04-08 | 2023-06-16 | 陈学仕 | Manufacturing method of ink-jet printing packaging type quantum dot, light conversion unit and display panel |
| KR102647252B1 (en) * | 2020-09-08 | 2024-03-13 | 세메스 주식회사 | Appratus for inspecting droplet and method thereof |
| CN114619771B (en) * | 2020-12-11 | 2023-10-27 | 京东方科技集团股份有限公司 | Inkjet printing apparatus and inkjet printing method |
| CN113745443A (en) * | 2021-08-24 | 2021-12-03 | Tcl华星光电技术有限公司 | Ink-jet printing method, display panel manufacturing method and display panel |
| CN114132080B (en) * | 2021-12-02 | 2022-06-07 | 北京博示电子科技有限责任公司 | Method and device for adjusting printing points, electronic equipment and storage medium |
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