Iterative UV Curing for Inkjet Printing on Curved Surfaces
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Solution Overview
Problem
Current methods for marking cylindrical surfaces, such as test tubes and bottles, face challenges in achieving high-fidelity prints due to the curved and non-porous nature of the substrates, leading to issues with ink migration and resolution, especially when using UV curable inks.
Innovation Solution
An inkjet printing device with a UV light source that preheats and cures UV curable ink on cylindrical surfaces, employing iterative printing cycles and a clear-coat layer to improve print quality and durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If UV curable ink is jetted onto curved surfaces, then printing capability on cylindrical objects is achieved, but ink migration and resolution issues occur
Solution Approach 1:
The patent applies preliminary heating to the curved surface before inkjet printing to prepare the substrate. This pre-heating step modifies the surface temperature to control ink behavior during printing, preventing migration and improving resolution on cylindrical objects.
Solution Approach 2:
The patent changes the temperature parameter of the substrate by heating it before printing. This parameter modification affects the ink's interaction with the surface, reducing migration and enhancing print quality on curved surfaces.
2Manufacturing precision
If multiple ink layers are printed iteratively, then print quality and durability are improved, but printing time increases
Solution Approach 1:
The patent implements continuous iterative printing cycles where the substrate moves through the printing system multiple times, receiving successive ink layers without interruption. Each pass deposits additional ink that is immediately cured, building up quality and durability continuously.
Solution Approach 2:
The patent uses periodic printing passes with UV curing in between each ink layer deposition. This cyclic process of printing and curing repeated multiple times creates durable, high-quality prints on curved surfaces.
3Reliability
If UV light is used to cure ink, then ink durability and resistance to solvents are improved, but equipment complexity increases
Solution Approach 1:
The patent combines the UV light source and inkjet printing system into an integrated apparatus. The UV curing mechanism is merged with the printing process, allowing immediate curing of each ink layer as it is deposited, simplifying the overall system while maintaining durability.
Solution Approach 2:
The patent replaces traditional mechanical drying or bonding methods with UV photopolymerization. This substitution uses light-induced chemical reactions instead of mechanical processes to achieve rapid, durable ink fixation on curved surfaces.
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 method enhances print quality and durability by reducing ink migration and smudging, allowing for precise and long-lasting text and image printing on curved surfaces, even in environments with chemicals or extreme temperatures.
Implementation Method 1
UV inks cure by chemical reaction from the UV light between 200 and 380 nm. A typical UV ink can be cured with less than 1 second of exposure of UV light with sufficient energy (2-8 W/cm2).
Implementation Method 2
The printing unit preheats the printing objects prior through the use of the UV light source
Data Source
AI summary
A method to improve the printing quality of an inkjet printing device for cylindrical surfaces. Specifically, the method will improve the quality of the printed images on the surface of cylindrical objects by iteratively printing and curing the images multiple times, such that even if the outermost layer of ink pigments somehow become smeared and/or removed due to external exposure, the remaining ink pigments below will preserve the printed image's fidelity and legibility.