Oriented Magnetic Security Thread Seamless Pattern
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Solution Overview
Problem
Security threads or stripes embedded in currency substrates face challenges in displaying a seamless repetitive pattern with a repetition length smaller than the width of the document, which is necessary for continuous authentication without requiring cutting or alignment, and for ensuring that each document contains at least one full period of information for unambiguous authentication.
Innovation Solution
A security thread or stripe comprising a hardened coating with oriented magnetic or magnetizable pigment particles, which are fixed in their positions and orientations to create a repetitive seamless pattern, using techniques like rotogravure, screen-printing, or flexographic printing, allowing for the incorporation of both printed and magnetically oriented graphic information in a single pass, and potentially including additional security features like luminescent or holographic layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional printing methods are used to apply security coating on threads, then production efficiency is maintained, but the coating cannot achieve proper magnetic particle orientation for seamless repetitive patterns
Solution Approach 1:
The patent combines the printing process and magnetic orienting process into a single integrated operation. The printing device applies coating composition containing magnetic particles while simultaneously applying a magnetic field to orient the particles, eliminating the need for separate printing and orienting steps. This merging of operations achieves precise magnetic particle orientation for seamless repetitive patterns while maintaining high production efficiency through continuous single-pass processing.
Solution Approach 2:
The patent implements continuous single-pass processing where the printing device applies coating composition and magnetic field orientation occurs simultaneously during the same continuous operation. The thread substrate moves continuously through the printing device while receiving both the coating material and magnetic field treatment without interruption, ensuring uninterrupted production flow and maintaining high productivity while achieving precise particle orientation.
2Reliability
If the repetition length of the pattern is made smaller than the document width, then authentication becomes unambiguous, but the manufacturing complexity increases
Solution Approach 1:
The patent segments the magnetic field application into discrete magnetic domains or poles arranged in repetitive patterns on the printing device. By dividing the magnetic field into multiple segments corresponding to different orientations, the device creates seamless repetitive patterns with controlled repetition lengths. This segmentation allows precise control over pattern repetition while maintaining manageable device complexity through modular magnetic pole arrangements.
Solution Approach 2:
The patent employs periodic magnetic field application with repeating patterns of magnetic poles or domains. The magnetic field is applied in periodic cycles as the thread substrate moves through the printing device, creating seamless repetitive patterns with specific repetition lengths. This periodic action ensures that each document contains at least one full period of information for unambiguous authentication while using straightforward cyclic field generation that does not significantly increase manufacturing complexity.
3Reliability
If multiple security features are incorporated into the thread, then counterfeit resistance increases, but the manufacturing process becomes more complex
Solution Approach 1:
The printing device is designed with multi-functionality to perform multiple security feature incorporations in a single integrated system. The device can apply different coating compositions containing various security elements (magnetic particles, luminescent materials, holographic components) through multiple printing units or by changing coating materials. This universal device design incorporates multiple security features while avoiding the need for separate manufacturing processes for each feature, thereby maintaining manageable manufacturing complexity.
Solution Approach 2:
The patent merges multiple security feature applications into a single integrated printing and orienting operation. Different security elements are incorporated simultaneously during the same continuous pass through the printing device, combining what would traditionally require separate manufacturing steps. This merging approach increases counterfeit resistance through multiple security features while keeping the manufacturing process relatively simple by eliminating sequential separate operations.
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 enables the creation of security threads or stripes with enhanced security features that are machine-readable and provide increased counterfeit resistance, while maintaining production efficiency, by ensuring a seamless repetitive pattern that meets the constraints of banknote manufacturing and authentication requirements.
Implementation Method 1
The optically variable pigment particles in an optically variable magnetic coating can be oriented after printing, while the coating is still 'wet', i.e. unhardened, through the application of an appropriate unstructured or structured magnetic field
Implementation Method 2
the application of an appropriate unstructured or structured magnetic field, and then fixed in their respective positions and orientations through a hardening of the coating composition on the substrate
Data Source
AI summary
The present invention concerns a security thread or stripe for the incorporation into or onto a value-document or currency substrate, as well as a method and means of making such thread or stripe. The thread or stripe comprises a plastic foil which carries a hardened coating comprising oriented magnetic or magnetizable pigment particles, the orientation of said pigment particles representing graphic information. Preferred are optically variable magnetic or magnetizable pigment particles. Said hardened coating may also be comprised between a first and a second plastic foil. Said graphic information is a repetitive seamless pattern of suitable repetition length, which is produced using a magnetic orienting cylinder having a corresponding repetitive seamless magnetic field pattern. A magnetic orienting cylinder and a process for process for producing such magnetic orienting cylinder are also disclosed. The process comprises the coating of a cylindrical support body with a polymer material comprising a high-coercivity permanent-magnetic powder as a filler material, and magnetizing or engraving the seamless outer cylinder surface to form on the cylinder a repetitive seamless magnetic field pattern.