Inkjet Coating UV-Curing Stability
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Solution Overview
Problem
Inkjet printing technologies have limitations in mechanical and chemical stability, restricting their use in industrial surface refinement processes due to the need for drying zones and inadequate ink resistance to stresses, which hinders their application in areas requiring high stability and resolution.
Innovation Solution
A 3-layer architecture comprising a first inkjet-printed colored coat followed by a transparent, UV-curable or solvent-based covering layer, using specific inks and coatings that provide improved mechanical and chemical stability, allowing for rapid curing and further processing, and enabling haptical and graphical individualization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If inkjet printing methods are used for surface refinement, then high resolution and high printing speeds are achieved, but mechanical and chemical stability of the coating is insufficient
Solution Approach 1:
The patent applies composite material principles by creating a multi-layer coating system consisting of an inkjet-printed first coat and a transparent covering second coat. This composite structure combines the high-resolution graphical capabilities of inkjet printing with the mechanical and chemical stability of the covering layer, resolving the contradiction between printing quality and coating durability.
2Ease of manufacture
If aqueous inks are used for porous media, then printing is possible, but a drying zone is required which slows down production
Solution Approach 1:
The patent utilizes phase transition principles by employing UV-curable inks that transition from liquid to solid state through UV irradiation. This eliminates the need for thermal drying zones required by aqueous inks, as the UV-curing process occurs instantaneously upon exposure, thereby maintaining high production rates while enabling printing on various media including non-porous materials.
3Adaptability or versatility
If solvent-containing inks are used, then printing on non-porous media is possible, but a long drying zone is needed which is not always available
Solution Approach 1:
The patent replaces the thermal drying mechanism with a photopolymerization mechanism. Instead of using heat or air circulation to evaporate solvents over extended drying zones, the UV-curable ink system uses UV light irradiation to initiate rapid polymerization and curing. This substitution eliminates the need for long drying zones while maintaining versatility across different media types.
4Productivity
If conventional inks are used for industrial applications, then printing can be performed, but the coatings are not resistant to mechanical and physicochemical stresses
Solution Approach 1:
The patent applies preliminary action by forming a protective covering layer (second coat) over the inkjet-printed first coat before the product is subjected to mechanical or physicochemical stresses. This pre-applied protective layer is specifically designed to provide resistance to scratches, chemicals, and environmental factors, thereby protecting the underlying printed coating while maintaining the high-speed printing capabilities of the inkjet process.
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 solution enables stable and durable surface refinements suitable for industrial applications, allowing for high-resolution, high-speed printing with inkjet technology on various materials, including plastics and glass, while combining graphical and haptical effects in a single method step, meeting industrial standards for furniture and automotive specifications.
Implementation Method 1
A second, transparent coat consisting of one or more covering layers (or top coats) is superposed on this first coat for the purpose of protecting said first, colored coat
Data Source
AI summary
There are several coatings and a method for surface finishing, in particular for producing durable and stable surface coatings using ink jet printing methods. The coating comprises a first layer, which can be produced from one or more ink jet-capable inks, and a second layer, which can be produced from one or more top coats, wherein at least the first layer is applied using an ink jet print head.