Magnetic Optical Effect Layers With Personalized Indicia
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing methods for producing optical effect layers with magnetically oriented non-spherical magnetic or magnetizable pigment particles are limited in versatility, scalability, and require specialized equipment, making it difficult to create customized and personalized designs efficiently.
Innovation Solution
A method involving the application of a radiation curable coating composition with non-spherical magnetic or magnetizable pigment particles, followed by a top coating composition, and simultaneous or sequential curing and magnetic field orientation to produce optical effect layers with personalized indicia, using LED and UV curing units without the need for photomasks or addressable LED curing units.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional magnetic field generating devices are used to orient pigment particles, then magnetic orientation is achieved, but device complexity and requirement for specialized equipment increase
Solution Approach 1:
The patent replaces complex magnetic field generating devices with a simple bar magnet for creating magnetic gradients. This substitution maintains the ability to orient pigment particles while dramatically reducing device complexity and eliminating the need for specialized equipment. The bar magnet creates sufficient magnetic gradient through its magnetic field to achieve reliable particle orientation.
2Manufacturing precision
If photomasks or addressable LED curing units are used, then curing precision is improved, but device complexity and cost increase
Solution Approach 1:
The patent extracts and removes the complex photomask and addressable LED curing unit components from the system. Instead, it uses a simple UV curing unit that cures the entire coating layer uniformly. The precision previously provided by photomasks is replaced by the selective application of uncured resin in defined patterns, eliminating the need for these complex components.
Solution Approach 2:
The patent segments the coating composition into two distinct components: cured resin (forming the base layer) and uncured resin (forming the magnetic gradient pattern). This segmentation allows the uncured resin to be selectively placed in defined patterns before curing, achieving manufacturing precision without requiring photomasks or addressable LED curing units.
3Adaptability or versatility
If customized and personalized designs are produced, then adaptability and versatility improve, but production time and efficiency worsen
Solution Approach 1:
The patent applies uncured resin in defined patterns before the magnetic orientation step. This preliminary action creates the design pattern in advance, allowing magnetic particles to orient within pre-defined areas. This approach enables customized designs to be produced efficiently without requiring time-consuming post-processing or reconfiguration steps.
Solution Approach 2:
The patent uses a dynamic process where the coating composition remains uncured and flexible during the design application and magnetic orientation steps. This dynamic state allows for easy modification of designs and quick transitions between different patterns, maintaining high productivity while enabling customized and personalized designs.
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 production of eye-catching optical effect layers with high resolution and customer-specific designs at high production speeds, ensuring reliability and ease of implementation on an industrial scale.
Implementation Method 1
applying on a substrate surface a radiation curable coating composition... and at least partially curing the coating layer
Implementation Method 2
exposing the coating layer to a magnetic field of a magnetic-field generating device so as to orient at least a part of the non-spherical magnetic or magnetizable pigment particles
Data Source
AI summary
The invention relates to the field of the protection of security documents such as for example banknotes and identity documents against counterfeit and illegal reproduction. In particular, the present invention provides methods for producing optical effect layers (OELs) exhibiting one or more indicia (x30) on a substrate (x20), said method comprising a step of exposing a coating layer (x10) comprising non-spherical magnetic or magnetizable pigment particles to a magnetic field of a magnetic-field generating device so as to orient at least a part of the magnetic or magnetizable pigment particles; a step of applying a top coating composition on top of the coating layer (x10) and in the form of one or more indicia (x30), and a step of at least partially curing the coating layer (x10) and the one or more indicia (x30) with a curing unit (x50).