Magnetic Orientation Device for High-Resolution Security Indicia
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing methods for transferring high-resolution magnetic orientation patterns into magnetic coating layers in high-speed printing processes result in dull visual appearances due to perpendicular orientation of magnetic pigment flakes, lacking esthetics and resolution.
Innovation Solution
A magnetic orientation device comprising a permanent-magnetic plate with surface relief and additional magnets, where the plate is magnetized approximately perpendicular to its surface, and the additional magnets are positioned to create a magnetic field with angles less than 45° to the plate's surface, allowing for the orientation of magnetic pigment particles to produce bright and high-resolution designs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a permanent-magnetic plate with surface relief is used to transfer high-resolution magnetic orientation patterns, then manufacturing precision is improved, but the visual appearance becomes dull due to perpendicular orientation of magnetic pigment flakes
Solution Approach 1:
The invention changes the magnetic field angle parameter from perpendicular (90°) to oblique (less than 45°) by positioning additional magnets at specific locations and orientations. This parameter change allows magnetic pigment flakes to orient at angles that simultaneously achieve high-resolution pattern transfer and maintain bright visual appearance through optimized light reflection properties.
Solution Approach 2:
The invention adds a spatial dimension to the magnetic field configuration by positioning additional magnets below and at angles relative to the permanent-magnetic plate. This creates a three-dimensional magnetic field distribution that enables oblique field angles at the coating surface while maintaining the plate's structural integrity and pattern definition capabilities.
2Illumination intensity
If additional magnets are positioned to create oblique magnetic fields, then visual appearance is improved, but device complexity increases
Solution Approach 1:
The magnetic field generation function is segmented between the permanent-magnetic plate (providing pattern definition and vertical field component) and additional magnets (providing oblique field component). This segmentation allows each component to be optimized independently while working together to achieve the desired magnetic field configuration for high-resolution and bright visual appearance.
Solution Approach 2:
The permanent-magnetic plate acts as an intermediary between the additional magnets and the coating composition. It receives the oblique magnetic field influence from additional magnets and transfers the high-resolution pattern information to the coating, mediating between the two magnetic field sources to achieve both pattern fidelity and visual brightness.
3Manufacturing precision
If perpendicular magnetization is used for high-resolution pattern transfer, then manufacturing precision is improved, but the orientation of magnetic pigment flakes results in dull appearance
Solution Approach 1:
The invention introduces asymmetry in the magnetic field configuration by positioning additional magnets at asymmetric locations and orientations relative to the permanent-magnetic plate. This creates an oblique magnetic field that induces asymmetric orientation of magnetic pigment flakes, producing bright visual appearance while the permanent-magnetic plate's symmetric relief structure maintains pattern resolution.
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 creation of high-resolution, aesthetically appealing magnetic designs on security documents and products by orienting magnetic pigment particles, enhancing the visual appearance and functionality of security features in high-speed printing processes.
Implementation Method 1
at least one magnetized magnetic plate (2) having a first magnetic field and having surface relief, engravings or cut-outs on a surface thereof representing said indicia, and at least one additional magnet (3, 3a, 3b) having a second magnetic field
Implementation Method 2
the coating composition (I) comprising at least one type of magnetic or magnetizable pigment flakes
Data Source
AI summary
The invention concerns a device for magnetically transferring indicia, such as a design or an image, to a wet coating layer applied on a substrate, such as a sheet or a web, wherein the said coating layer comprises at least one type of magnetic or magnetizable particles; said device comprising a) at least one magnetized permanent-magnetic plate (2) carrying relief, engravings or cut-outs, mounted such that its relief surface remains accessible, b) at least one additional magnet (3), disposed below said at least one permanent-magnetic plate, facing the surface of the magnetic plate which is opposite to the relief, engraving or cut-out, and c) a holder (1), which has the mechanical function to hold the pieces together in fixed positions. A method for producing the device, the use of the device, and magnetically induced designs obtained with the device, which are useful for protecting currency, value—and identity documents, are disclosed as well.