Magnetic Optical Effect Layers With Custom Indicia at Industrial Speed
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Solution Overview
Problem
Existing methods for producing optical effect layers (OELs) with magnetically oriented non-spherical magnetic or magnetizable pigment particles are limited in versatility, scalability, and require specialized equipment, making it difficult to produce customized and eye-catching designs efficiently on security documents and decorative articles.
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 orientation to create a single-layer OEL with customizable indicia, using LED and UV curing units without photomasks or addressable LEDs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional printing methods are used for variable data printing, then production speed can be maintained, but print quality deteriorates due to registration errors and misalignment
Solution Approach 1:
The printing system is segmented into separate functional units: a fixed printing section for common elements and a variable data section for unique information. This segmentation allows each section to be optimized independently, with the fixed section maintaining high precision registration while the variable section handles quick changes without affecting overall production speed.
Solution Approach 2:
The patent introduces a temporal dimension to the printing process by pre-positioning fixed elements and layering variable data on top. This dimensional approach allows registration to be established in one pass while variable data is applied in subsequent layers, eliminating the need for repeated high-precision alignment at full production speed.
2Adaptability or versatility
If magnetic pigment particles are applied to achieve magnetic indicia, then functionality is improved, but particle distribution uniformity deteriorates due to aggregation
Solution Approach 1:
A binder material is introduced as an intermediary substance that mediates between the magnetic pigment particles and the substrate. This binder prevents direct particle-to-particle contact that causes aggregation, while still allowing the magnetic particles to respond to magnetic fields for indicia formation, thus maintaining both functionality and uniform distribution.
Solution Approach 2:
The patent creates a composite material system combining magnetic pigment particles with a binder matrix. This composite approach allows the magnetic particles to be dispersed uniformly throughout the binder, preventing aggregation while retaining their magnetic properties for indicia application.
3Manufacturing precision
If multiple printing passes are used for layering, then print quality is improved, but production speed deteriorates
Solution Approach 1:
Fixed printing elements are pre-positioned and cured in advance to create a stable base layer with precise registration marks. This preliminary action establishes the registration framework before variable data is applied, allowing subsequent layers to be aligned quickly without requiring multiple high-precision passes at full production speed.
Solution Approach 2:
The printing process uses periodic action by applying variable data in discrete bursts or intervals rather than continuous printing. This allows the system to maintain high-speed production while periodically applying aligned layers with precise registration, rather than requiring continuous slow-speed precision printing.
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 high-resolution, customizable OELs with personalized indicia at industrial speeds, ensuring reliability and ease of implementation without the need for specialized equipment, suitable for security documents and decorative elements.
Implementation Method 1
The magnetic or magnetizable pigment particles are applied to the optical effect layer and a magnetic field is applied to the particles to align the particles and form magnetic indicia
Data Source
Figure 1~2A-1
Figure 2A-2~2B
Figure 2C~2D
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).