Security Threads with Oriented Magnetic Pigments for Anti-Counterfeiting
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Solution Overview
Problem
Existing security threads and stripes for protecting value documents against counterfeiting and illegal reproduction are complex to produce and lack sufficient visual dynamicity, making them susceptible to reproduction by common office equipment.
Innovation Solution
The introduction of security threads or stripes comprising a combination of hardened coatings with oriented non-spherical magnetic or magnetizable pigment particles, a holographic metallic layer, and transparent substrates, which create a plural rolling bar effect when tilted, enhancing visual attractiveness and production efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional security threads with static security features are used, then production is simpler, but visual dynamicity is insufficient making them susceptible to counterfeiting
Solution Approach 1:
The patent applies the dynamics principle by incorporating magnetic or magnetizable pigment particles that respond to magnetic fields, creating a dynamic visual effect where rolling bars appear to move and change position when the document is tilted or a magnet is brought near. This dynamic behavior makes counterfeiting significantly more difficult while the production process remains relatively simple using conventional printing and magnetic field application equipment.
Solution Approach 2:
The patent utilizes parameter changes by varying the orientation and distribution of magnetic pigment particles to create different visual effects. By controlling the magnetic field parameters during production, the rolling bar patterns can be made to move in specific directions and at different speeds, providing multiple security parameters that are difficult to replicate without the magnetic components.
2Reliability
If optically variable pigments are used to create color shift effects, then forgery protection is improved, but visual dynamicity remains limited compared to movement illusions
Solution Approach 1:
The patent incorporates optically variable pigments that exhibit color shift effects when viewed from different angles, providing an additional layer of security. This is combined with the magnetic rolling bar effect to create a multi-parameter security feature that changes both color and position dynamically, significantly enhancing visual attractiveness and making forgery extremely difficult.
3Ease of operation
If magnetic pigment particles are oriented to create rolling bar effects, then visual dynamicity is enhanced, but production process complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-mixing magnetic or magnetizable pigment particles into the coating material before application. This allows the particles to be uniformly distributed and then oriented by applying a magnetic field during or after the coating process, eliminating the need for complex post-processing equipment while achieving the desired rolling bar visual effects.
Solution Approach 2:
The patent uses a magnetic field as an intermediary to orient the magnetic pigment particles without direct mechanical contact. This allows for precise control of particle orientation and rolling bar pattern formation using simple magnet placement or electromagnetic coils, significantly reducing production equipment complexity compared to mechanical orientation methods.
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 provides enhanced resistance against counterfeiting by increasing the visual dynamicity and complexity of the security features, making them harder to reproduce and improving the production process simplicity.
Implementation Method 1
oriented by the action of a magnetic field
Implementation Method 2
non-spherical magnetic or magnetizable pigment particles
Implementation Method 3
optically variable security elements
Implementation Method 4
holographic metallic layer
Data Source
AI summary
The present invention relates to the field of the protection of value documents and value commercial goods against counterfeit and illegal reproduction. In particular, the present invention relates to security threads or stripes comprising a holographic metallic layer; a first transparent substrate; a second transparent substrate; a first hardened coating and a second hardened coating, wherein a first plurality of non-spherical magnetic or magnetizable pigment particles of the first hardened coating are oriented so as to follow a convex curvature and wherein the second plurality of non-spherical magnetic or magnetizable pigment particles of the second hardened coating are oriented so as to follow a concave curvature so as to form a plural rolling bar effect.