Vacuum Drying Solvent Recovery for OLED Inkjet Printing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The vacuum thermal evaporation process for manufacturing OLED display elements has limitations due to low material utilization rate, high preparation cost, and poor film formation uniformity, which hinders the commercialization of OLED displays, while the solvent recovery in ink-jet printing methods is costly due to high solvent requirements for precision.
Innovation Solution
A vacuum drying and solvent recovery device integrates a solvent recovery system outside the vacuum drying system, utilizing a vacuum chamber, solvent recovery chambers, and a valve switching unit to condense and recover volatilized solvents, reducing production costs by recycling solvents for ink-jet printing inks used in OLED device fabrication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If vacuum thermal evaporation process is used to manufacture OLED display elements, then film formation can be achieved, but material utilization rate is low and preparation cost is high
Solution Approach 1:
The patent changes the fundamental parameters of the manufacturing process by transitioning from vacuum thermal evaporation to ink-jet printing followed by vacuum drying. This involves changing the deposition method from physical vapor deposition to solution-based printing, and changing the drying method from ambient evaporation to vacuum drying, thereby improving both material utilization and film uniformity
Solution Approach 2:
The patent replaces the mechanical vacuum thermal evaporation system with an ink-jet printing system combined with vacuum drying. The ink-jet printing system uses precision-controlled droplet deposition instead of thermal field-based material transport, achieving better material efficiency and cost-effectiveness
2Productivity
If solvent is rapidly evaporated under negative pressure to remove solvent components from ink, then drying efficiency is improved, but solvent recovery cost increases due to high solvent requirements
Solution Approach 1:
The patent utilizes phase transition of solvent from liquid to vapor under vacuum conditions for rapid evaporation and drying. The vacuum environment lowers the boiling point and accelerates the phase transition, enabling efficient solvent removal while maintaining control over the drying process
Solution Approach 2:
The patent converts the harmful effect of solvent volatilization (which causes loss and environmental pollution) into a beneficial recovery process. By capturing the volatilized solvent and implementing recovery measures, the system transforms a waste stream into a recyclable resource, reducing both cost and environmental impact
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The device effectively recycles solvents from ink-jet printing inks, reducing production costs and improving material utilization efficiency by integrating solvent recovery outside the vacuum drying system, enhancing the feasibility of OLED display manufacturing.
Implementation Method 1
the vacuum exhaust pump set provides a negative pressure environment to the vacuum chamber, so that the solvent in the IJP ink is volatilized under the negative pressure environment of the vacuum chamber
Implementation Method 2
the valve switching unit connects the solvent recovery chamber with the vacuum exhaust pump set, so that gas discharged from the vacuum exhaust pump set is conducted into the solvent recovery chamber and cooled by the solvent recovery chamber to condense and recovery the solvent
Data Source
AI summary
Disclosed is a vacuum drying and solvent recovery device, including a vacuum drying system for drying an ink jet printing (IJP) ink by volatilizing a solvent in the IJP ink and a solvent recovery system for recovering the solvent volatilized from the IJP ink. By integrating the solvent recovery system outside the vacuum drying system and providing a plurality of solvent recovery chambers in the solvent recovery system to condense and recover solvents for various systems, the recycling of the solvents in the IJP inks and the reduction of production costs can be achieved.