Curable Ink Molding for Topographical Pattern Creation
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Solution Overview
Problem
Phase-change inks, such as gel-based inks, face issues with high viscosity and profile on print surfaces, leading to undesirable artifacts and requiring additional steps for leveling and curing, which can be inefficient in printing systems.
Innovation Solution
A printing system that incorporates a molding surface to simultaneously level and cure the ink, using a combination of mechanical deformation and radiation curing, allowing for the creation of topographical patterns and efficient ink spreading, while utilizing a release layer for easy de-molding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If phase-change inks are used for fast printing, then printing speed is improved, but ink profile and viscosity cause spreading artifacts
Solution Approach 1:
A release layer is applied to the print surface before printing. This layer prevents the high-viscosity phase-change ink from adhering strongly to the substrate, allowing the ink to be easily removed after printing. This preliminary action enables fast printing speeds while preventing permanent spreading artifacts on the final substrate.
Solution Approach 2:
The release layer acts as an intermediary between the ink and the substrate. It temporarily holds the ink during the printing process, allowing for fast deposition, then releases the ink to prevent permanent adhesion and spreading artifacts. This mediator enables both high printing speed and good image quality by controlling the ink-substrate interaction.
2Manufacturing precision
If additional leveling and curing steps are added, then image quality is improved, but processing time increases
Solution Approach 1:
The printing and curing processes are merged into a single step. The phase-change ink is printed directly onto the substrate and simultaneously cured by heating the substrate to a temperature above the ink's melting point. This eliminates separate leveling and curing steps, maintaining high image quality while reducing total processing time.
Solution Approach 2:
The ink undergoes a phase transition from solid to liquid during printing, then back to solid upon curing. The substrate is heated to melt the deposited ink, allowing it to level and spread properly, then cooled to solidify the cured image. This controlled phase transition enables high-quality printing without additional processing steps.
3Manufacturing precision
If ink is pressed or leveled to reduce profile, then spreading is improved, but device complexity increases
Solution Approach 1:
The substrate itself is used to level and spread the ink through its thermal properties. By heating the substrate to melt the ink and then allowing it to cool, the ink automatically levels and spreads to form a uniform image. This self-service approach eliminates the need for separate mechanical leveling devices, reducing system complexity while improving ink spreading.
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 approach effectively addresses the high viscosity and profile issues of phase-change inks by ensuring proper spreading and curing, resulting in improved image quality and reduced processing steps, enabling the creation of intricate patterns and information codes like watermarks and Braille text.
Implementation Method 1
A printing system that incorporates a molding surface to simultaneously level and cure the ink, using a combination of mechanical deformation and radiation curing
Implementation Method 2
exposing the freshly-printed ink to radiation, such as ultraviolet (UV) light or other actinic radiation
Data Source
AI summary
A system has a print head to dispense ink onto a print surface to form a printed image, a molding surface to contact the ink to form an informational image in at least the surface of the ink, and a radiation source to solidify the ink into the printed and informational images. A method includes dispensing ink onto a print medium to form a printed image, pressing a molding surface onto the printed image to transfer an informational image onto the printed image, and solidify the ink into the printed and informational images.