Dynamic Inkjet Drying Distance Control for Non-Planar Surfaces
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Solution Overview
Problem
Inkjet printing systems face challenges in maintaining high-resolution images on non-planar surfaces due to ink spreading issues, especially when using UV or infrared drying methods, as the distance between print heads and drying sources becomes impractical to manage on curved or irregular surfaces, leading to blurred outlines and ink accumulation.
Innovation Solution
A method and device where the application and further treatment tools, such as inkjet print heads and radiation sources, are controlled to maintain a time lag adapted to the spreading behavior of the fluid, allowing for precise movement over complex surfaces without collisions, using separate or shared robot arms to adjust the distance and path for optimal drying.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the distance between inkjet print heads and radiation sources is increased to accommodate flat surface printing, then productivity is improved, but manufacturing precision deteriorates due to ink spreading and blurred outlines
Solution Approach 1:
The system dynamically adjusts the distance between the inkjet print head and radiation source based on the surface geometry being printed. For curved or irregular surfaces, the distance is reduced to prevent ink spreading, while for flat surfaces the distance can be increased to maintain productivity. This dynamic adjustment resolves the contradiction between printing speed and image resolution.
2Adaptability or versatility
If robot-guided printing is used to image curved surfaces, then adaptability is improved, but device complexity increases due to path programming requirements
Solution Approach 1:
The system uses feedback from the surface geometry data to automatically adjust printing parameters and robot paths. The control system receives information about the surface curvature and automatically modifies the printing strategy, eliminating the need for complex manual path programming while maintaining high adaptability to different surface geometries.
3Manufacturing precision
If ink drying time is extended to prevent spreading, then manufacturing precision is improved, but loss of time increases
Solution Approach 1:
The system changes the drying parameters dynamically based on the surface geometry and ink properties. For surfaces prone to ink accumulation, the drying time is extended locally, while for other areas the drying time is minimized to maintain overall productivity. This selective parameter adjustment resolves the contradiction between image quality and processing speed.
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
Enables the application of solid ink areas on non-planar surfaces with improved visual appeal by maintaining the optimal operating distance and preventing ink spreading, allowing for faster and more precise printing and drying processes, even on irregularly shaped objects.
Implementation Method 1
In the case of ink systems that do not dry automatically but are dried or cured by radiation such as infrared or UV radiation
Implementation Method 2
dried or cured by radiation such as infrared or UV radiation
Implementation Method 3
That window of processing time is dependent on the substrate of the object to be imaged, for example on the surface energy, the absorbency, and on the ink itself, i.e. its viscosity and surface tension
Data Source
AI summary
A device for imaging and/or varnishing the surfaces of objects or vehicles, etc. includes adapting a time lag between an application of fluid and further treatment thereof, such as drying ink or varnish, to a spreading behavior of the fluid during the application thereof. The fluid may be applied to the surface of the object in sections, firstly drying the fluid in individual sections before applying it to the next section.