Loop-Shaped Magnetic Assembly for Oriented Pigment Orientation
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Solution Overview
Problem
Existing security features, particularly those using magnetic or magnetizable pigment particles, face challenges in producing high-quality, eye-catching loop-shaped effects on substrates that are difficult to counterfeit and require specialized equipment, with issues like blurred ring edges and reduced magnetic field intensity due to the use of single magnets.
Innovation Solution
A process involving a radiation curable coating composition with non-spherical magnetic or magnetizable pigment particles is applied to a substrate, exposed to a magnetic field generated by a loop-shaped magnet or combination of dipole magnets, and then cured to create an optical effect layer that displays a dynamic loop-shaped effect upon tilting, enhancing the security and authenticity of documents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single spherical magnet is used to orient magnetic pigment particles, then the device complexity is low, but the manufacturing precision deteriorates due to blurred ring edges and low magnetic field intensity
Solution Approach 1:
The single spherical magnet is segmented into multiple dipole magnets arranged in a loop configuration. This segmentation creates distinct magnetic poles (North and South) that generate sharper magnetic field lines, eliminating the blurred ring edges problem while maintaining manageable device complexity through modular arrangement.
Solution Approach 2:
The patent transitions from a spherical magnet geometry to a loop-shaped magnet arrangement with specific curvature characteristics. The loop configuration with defined radius and pole positioning creates concentrated magnetic field lines that produce well-defined loop-shaped effects with sharp edges, resolving the precision issue.
2Device complexity
If a single magnet is used, then the device complexity is low, but the magnetic field intensity deteriorates rapidly with distance from the magnet
Solution Approach 1:
Dividing the single magnet into multiple dipole magnets arranged in a loop creates multiple sources of magnetic field that collectively maintain higher field intensity over distance. The distributed configuration prevents rapid intensity decay by providing multiple contributing magnetic sources.
Solution Approach 2:
Multiple dipole magnets are merged into a coordinated loop-shaped magnetic assembly where their individual magnetic fields combine constructively. This merging effect creates a unified magnetic field pattern with enhanced intensity and extended range compared to a single magnet.
3Manufacturing precision
If non-spherical magnetic pigment particles are used, then the optical effect quality is improved, but the ease of manufacture deteriorates due to specialized orientation requirements
Solution Approach 1:
The magnetic orientation of non-spherical particles is performed preliminarily during the coating application stage using the loop-shaped magnetic assembly. This preliminary action aligns particles before the coating cures, ensuring high optical quality without requiring complex post-processing or specialized equipment beyond the magnetic assembly.
Solution Approach 2:
The patent replaces complex mechanical orientation systems with a magnetic field-based orientation mechanism. The loop-shaped magnetic assembly generates magnetic fields that naturally orient the non-spherical magnetic pigment particles according to the desired loop pattern, simplifying the manufacturing process while maintaining high optical effect quality.
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 produces high-quality, eye-catching loop-shaped effects that are difficult to counterfeit, providing enhanced security and authenticity by ensuring the magnetic particles are oriented effectively within the coating, resulting in a more robust and recognizable security feature.
Implementation Method 1
exposing the radiation curable coating composition to a magnetic field of a magnetic assembly (x30) comprising: a loop-shaped magnetic-field generating device (x31)... so as to orient at least a part of the non-spherical magnetic or magnetizable pigment particles
Implementation Method 2
at least partially curing the radiation curable coating composition of step ii) to a second state so as to fix the non-spherical magnetic or magnetizable pigment particles in their adopted positions and orientations
Data Source
Figure 1A~1C
Figure 2A~2C
Figure 3A~3C
AI summary
The present invention relates to the field of magnetic assemblies and processes for producing optical effect layers (OEL) comprising magnetically oriented non-spherical magnetic or magnetizable pigment particles on a substrate. In particular, the present invention relates to magnetic assemblies and processes for producing said OELs as anti-counterfeit means on security documents or security articles or for decorative purposes.