Magnetic Coating Composition for High-Resolution Security Images
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Solution Overview
Problem
Conventional coating compositions for magnetic optically variable pigments result in poor visual effects during the drying/curing process due to vertical shrinking of the ink or coating layer, leading to diminished resolution and contrast in magnetically induced images.
Innovation Solution
A coating composition with a volume ratio of ink vehicle to magnetic optically variable pigment greater than 5.0, using flexographic, gravure, silk-screen, or roller coating inks, ensures sufficient non-volatile components for maintaining pigment orientation and achieving high-quality magnetically induced images.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the ink or coating layer undergoes vertical shrinking during drying/curing, then the pigment concentration increases, but the pigment orientation is disrupted and image quality deteriorates
Solution Approach 1:
The patent applies preliminary anti-action by formulating the ink with a specific volume ratio of ink vehicle to pigment (greater than 5.0) that pre-compensates for the vertical shrinking that occurs during drying. This formulation prevents the pigment particles from settling or reorienting during the drying process, thereby maintaining both high pigment concentration and proper pigment orientation simultaneously.
2Duration of action of stationary object
If conventional coating compositions are used, then the drying process is complete, but vertical shrinking occurs and image resolution is reduced
Solution Approach 1:
The patent applies parameter changes by modifying the ink formulation parameters, specifically the volume ratio of ink vehicle to magnetic optically variable pigment, to be greater than 5.0. This parameter change ensures that during the drying process, the ink maintains sufficient vehicle content to prevent vertical shrinking, thereby preserving image resolution and contrast while still allowing complete drying.
3Loss of time
If the volume ratio of ink vehicle to pigment is low, then the ink dries faster, but the pigment orientation is not maintained and visual effect is poor
Solution Approach 1:
The patent applies parameter changes by optimizing the volume ratio of ink vehicle to magnetic optically variable pigment to be greater than 5.0. This formulation parameter ensures that sufficient non-volatile ink vehicle components remain after drying to maintain pigment orientation, while still allowing the ink to dry within acceptable timeframes for standard printing requirements.
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 prevents vertical shrinking, maintaining pigment orientation and enhancing the visual effect of magnetically induced images, ensuring high resolution and contrast while being compatible with standard printing requirements and economical.
Implementation Method 1
magnetic optically variable pigment particles which can be oriented by an applied magnetic field
Implementation Method 2
Magnetic optically variable pigments in printing inks or coatings allow for the production of magnetically induced images, designs and/or patterns through the application of a corresponding magnetic field, causing a local orientation of the magnetic optically variable pigment in the coating
Implementation Method 3
the ratio of the volume of the ink vehicle (V(I)) to the volume of the pigment (V(P)) is higher than 5.0
Data Source
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Figure 3a)~3b)
AI summary
The present invention is related to a coating composition for the production of a magnetically induced image, consisting of volatile components (S) and non-volatile components, the latter consisting of an ink vehicle (I) and magnetically orientable optically variable interference pigment (P), to a process for manufacturing the coating composition, and to the use of the composition for the production of a magnetically induced image coating on a substrate with the help of applied magnetic fields. Said magnetically induced image coating may be used as a security device on value- or identity documents, brand protection labels and the like.