Magnetic Optically Variable Ink Design via Magnetized Surface

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Solution Overview

Problem

Current optically variable inks used in security documents face challenges in maintaining authenticity due to the emergence of non-security optically variable pigments in the market, which can confuse the public and are easily reproducible, lacking a unique 'simple message' that can be verified by the unaided eye without access to the source pigment.

Innovation Solution

The use of magnetic optically variable pigments oriented through magnetic fields during the printing process, creating a high-resolution magnetic design that is unique and difficult to reproduce, utilizing a device with a magnetized surface to transfer the magnetic image onto a substrate, ensuring the design is recognizable and secure.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If magnetic optically variable pigments are used with magnetic field orientation, then security and authenticity are improved, but manufacturing cost and device complexity increase

Engineering Contradiction:

ImprovesecurityVSAvoidprinting machine complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent replaces complex mechanical orientation systems with magnetic field-based orientation. Instead of using mechanical means to align pigment particles, the invention applies magnetic fields to orient magnetic optically variable pigment particles, thereby simplifying the printing machine structure while maintaining high security performance.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent changes the physical state and orientation parameters of magnetic pigment particles through magnetic field application during printing. By controlling the magnetic field strength and direction, the system achieves precise particle orientation without complex mechanical mechanisms, resolving the contradiction between security and device complexity.

Inventive Principle:

Principle #35Parameter changes

2Manufacturing precision

If magnetic field orientation is applied during printing, then magnetic design resolution is improved, but printing process complexity increases

Engineering Contradiction:

Improvemagnetic design resolutionVSAvoidprinting process complexity

Core Design Contradiction:

Manufacturing precisionVSDevice complexity

Solution Approach 1:

The patent substitutes mechanical alignment mechanisms with magnetic field-based orientation to achieve high-resolution magnetic designs. The magnetic fields guide pigment particle placement with precision while maintaining a relatively simple printing process, avoiding the need for complex mechanical positioning systems.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent introduces magnetic fields as an intermediary between the printing system and pigment particles. This intermediary enables precise control of particle orientation and placement without direct mechanical intervention, thereby achieving high resolution while keeping the printing process simple.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Reliability

If magnetic optically variable pigment is used, then authenticity recognition is improved, but manufacturing cost increases

Engineering Contradiction:

Improveauthenticity recognitionVSAvoidmanufacturing cost

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The patent modifies the optical and magnetic parameters of pigment particles to create authentic magnetic designs. By controlling particle orientation through magnetic fields during printing, the system achieves high authenticity recognition while managing manufacturing costs through efficient use of specialized pigments and controlled printing processes.

Inventive Principle:

Principle #35Parameter changes

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 provides a secure, easily recognizable magnetic design that is resistant to reproduction without access to the source pigment, maintaining the authenticity of security documents and avoiding market pressure from decorative applications, with enhanced graphical resolution and cost-effectiveness.

Implementation Method 1

exposing the coated sheet or web, while the applied ink or coating composition is wet, to the magnetic field at the surface of a body of a permanent-magnetic material

Methodology Applied

Scientific EffectMagnetic field: Magnetic Field

Implementation Method 2

The use of magnetic optically variable pigments oriented using magnetic fields during the printing process

Methodology Applied

Scientific EffectMagnetism: Magnetism

Data Source

PatentUS7691468B2Method and means for producing a magnetically induced design in a coating containing magnetic particles

Publication Date: 2010.04.06 SICPA HOLDING SA

AI summary

The invention discloses a device and a method for transferring a predeterminable, high-resolution magnetic design onto a document printed with a magnetic ink, in particular a magnetic optically variable ink. The device comprises a body of a composite permanent-magnetic material, having at least one flat or curved surface engraved with indicia corresponding to the design to be transferred, wherein the said magnetic material is permanently magnetized, preferably in a direction substantially perpendicular to the said surface. The method comprises imprinting or coating a first surface of a sheet or web with a magnetic ink or coating composition, and approaching the imprinted sheet or web to the engraved surface of a body of magnetized composite permanent-magnetic material while the ink is wet, followed by hardening the ink.