Flexible Magnetic Printing Plate for Secure Document Encoding
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Solution Overview
Problem
Existing magnetically alignable printing technologies face limitations, particularly with color-shifting inks, where the color-shifting effect is poor and disappears when magnetic pigment particles are repositioned along lines perpendicular to the surface, making them unsuitable for secure documents, and require costly and difficult carving or embossing to vary the magnetic field.
Innovation Solution
A magnetizable composite material with regions of different magnetization directions is used, allowing for a flexible and cost-effective printing plate with encoded magnetic information that aligns flakes in a liquid to replicate images or logos without visible encoding, using a flat surface with magnetized and non-magnetized regions to create a variable magnetic field.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If magnetic pigment particles are repositioned along lines perpendicular to the surface, then the printing process can be completed, but the color-shifting effect disappears
Solution Approach 1:
The patent applies local quality by creating regions with different magnetization directions within the printing plate. Specifically, it uses regions magnetized in a first direction (perpendicular to surface) for standard printing and regions magnetized in a second direction (parallel to surface) to preserve color-shifting effects. This allows different parts of the plate to serve different functions simultaneously.
Solution Approach 2:
The printing plate is segmented into multiple magnetized regions with different orientations. The plate contains both first regions (magnetized perpendicular to surface) and second regions (magnetized parallel to surface), allowing selective application of different magnetic field configurations to different areas of the print.
2Adaptability or versatility
If carving or embossing is used to vary the magnetic field, then the magnetic field can be modified, but the process becomes costly and difficult
Solution Approach 1:
The patent replaces the mechanical system of carving or embossing the printing plate with a magnetic field-based system. Instead of physically modifying the plate structure, it uses regions with different magnetization directions to achieve magnetic field variation. This substitution eliminates the need for complex mechanical manufacturing processes while maintaining the ability to vary the magnetic field for different printing requirements.
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
This solution enhances the flexibility and manufacturing simplicity of magnets, allowing for sharper image boundaries and improved color-shifting effects by aligning flakes in a manner that reflects the encoded magnetic information, making it suitable for secure documents and reducing production costs.
Implementation Method 1
a first region along the surface of the body of magnetizable composite material is magnetized such that the first region provides a first magnetic field having a predetermined direction and a second region along the surface of the body of magnetizable composite material, surrounding the first region, is either unmagnetized or magnetized differently from the first region
Data Source
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AI summary
This invention discloses a magnet for use as a printing plate or printing head that is used for aligning flakes or particles in a paint or ink. A composite sheet or block of magnetizable material is selectively magnetized so that a magnet is formed within the sheet or block that has a shape of a predetermined image, logo, or indica. Dies are used to magnetize the magnetizable material and preferably the does contact the material to be magnetized. A pre-magnetized sheet such as a refrigerator magnet may be re-magnetized differently so that a magnetic image is encoded therein for use as a printing plate. Preferably the printing plate is flexible so that it can be formed to a curved surface of a cylinder or drum for printing. Conveniently these flexible magnets can be changed for other deisgins and placed on the same drum for use in printing.