Surface Energy Applicator for Aqueous Inkjet Printers
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Solution Overview
Problem
Aqueous inkjet printers face challenges in achieving consistent print quality due to the conflicting requirements of high surface energy for ink spreading and low surface energy for ink transfer on the blanket surface, with existing solutions like offline oxygen plasma treatments being short-lived and coating applications being difficult to control.
Innovation Solution
An aqueous inkjet printer is configured with a surface energy applicator that generates an electric field to increase the surface energy of the intermediate imaging surface, allowing for controlled ink drop spreading and subsequent transfer to media without the need for coatings, by directing energized particles towards the surface before ink ejection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the blanket surface has high surface energy to facilitate ink spreading, then ink drop spreading is improved, but ink transfer to media deteriorates
Solution Approach 1:
The patent applies a corona discharge treatment that dynamically modifies the blanket surface energy state. The high-voltage electrode generates ionized particles that temporarily increase surface energy to facilitate ink spreading, then the surface naturally returns to lower energy state for transfer. This dynamic adjustment resolves the contradiction between needing high energy for spreading and low energy for transfer.
Solution Approach 2:
The corona discharge treatment changes the physical-chemical parameters of the blanket surface by depositing charged particles and modifying surface chemistry. This parameter change temporarily increases surface energy without permanently altering the blanket material properties, enabling controlled ink spreading while maintaining transfer capability.
2Manufacturing precision
If offline oxygen plasma treatment is applied to increase blanket surface energy, then ink drop spreading is improved, but treatment duration and effectiveness deteriorate due to surface contamination and aging
Solution Approach 1:
The corona discharge treatment is applied immediately before ink ejection to preliminarily activate the blanket surface. This timing ensures the surface energy is optimized at the moment of ink deposition, overcoming the limitation of offline treatments that degrade over time due to contamination and aging.
Solution Approach 2:
The patent replaces offline chemical plasma treatment with an online electrical corona discharge system. This substitution allows for real-time, on-demand surface energy modification without the limitations of offline treatment duration, enabling continuous operation with consistent performance.
3Reliability
If coating material is applied to the blanket to facilitate ink wetting and release, then ink transfer is improved, but coating thickness control deteriorates leading to image defects
Solution Approach 1:
The patent replaces the mechanical coating application process with an electrical corona discharge treatment. This substitution eliminates the need for physical coating materials and their associated application challenges, achieving surface energy modification without the complexity of coating thickness control.
Solution Approach 2:
Instead of changing the physical presence of coating material thickness, the corona discharge changes the surface energy parameters of the existing blanket surface. This parameter-based approach avoids the manufacturing precision issues inherent in applying and controlling thin coating layers.
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
This solution enables improved ink drop spreading and transfer efficiency, enhancing print quality by regulating surface energy dynamically and maintaining it throughout the printing process, thus addressing the limitations of existing methods.
Implementation Method 1
A surface energy applicator is configured to generate an electric field to produce and direct energized particles towards the intermediate imaging surface
Implementation Method 2
The surface energy applicator is configured to generate an electric field to produce and direct energized particles towards the intermediate imaging surface
Implementation Method 3
Once the aqueous ink is ejected onto an image receiving surface by a printhead, the water or solvent is evaporated to stabilize the ink image on the image receiving surface
Data Source
AI summary
An aqueous inkjet printer is provided with a surface energy applicator that is positioned to treat the surface of a blanket immediately prior to a printhead ejecting ink onto the blanket. Modifying the surface energy of blanket with the electric field and charged particles produced by the applicator affects the adhesion of the ink to blanket. This adhesion changes from the impact of the ink on the blanket until the ink image is transferred to media. The surface energy applicator is operated during each print cycle to alter the surface energy of the blanket for each ink image formed on the blanket.