Variable Demetallization in Holographic Films
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Solution Overview
Problem
Existing demetallization techniques for holographic films are limited by the need for repetitive patterns determined by printing equipment, lacking variability and flexibility, which restricts the creation of unique and secure documents.
Innovation Solution
A method for generating a variable demetallized pattern in holographic webs by depositing a metal layer and applying a variable resist pattern using ink-jet printing or thermal transfer techniques, allowing for continuous alteration of the demetallization pattern independent of printing means, enabling personalized and secure products.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional printing equipment is used to create demetallization patterns, then the process is simple and equipment is readily available, but the pattern variability is limited and security is reduced
Solution Approach 1:
The patent replaces traditional mechanical printing systems with digital imaging systems (inkjet printers, laser printers, or thermal transfer printers) to apply resist patterns. This substitution enables variable demetallization patterns while maintaining process simplicity, as digital printers can generate unique patterns without requiring complex mechanical adjustments or specialized equipment.
2Reliability
If repetitive printing patterns are used, then manufacturing is efficient and equipment is standard, but security against counterfeiting is weakened
Solution Approach 1:
The patent introduces dynamic variability into the demetallization pattern generation process by using digital imaging systems that can create unique, non-repetitive patterns. The system allows for variable content (text, images, geometric shapes) to be printed at different positions and orientations, ensuring that each holographic overlay has a distinct demetallization pattern that is difficult to counterfeit, while still maintaining efficient batch production capabilities.
3Adaptability or versatility
If fixed demetallization patterns are applied, then the process is straightforward and quality control is easy, but forensic verification and distribution control are limited
Solution Approach 1:
The patent applies different demetallization patterns to different regions or individual items within a batch. Each holographic overlay can have unique local characteristics in its demetallization pattern, such as varying text, images, or geometric shapes at specific positions. This local variability enables forensic verification and distribution control while the overall process remains straightforward through digital printing technology.
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 creation of unique, secure documents with variable demetallization patterns that enhance manufacturing control, distribution, forensic verification, and security by allowing customizable and complex designs that are difficult to counterfeit.
Implementation Method 1
A variable resist pattern is applied to the metallized web with an ink-jet printer
Implementation Method 2
A variable resist pattern is applied to the metallized web with a thermal transfer printer
Implementation Method 3
The printed web is then brought through a corrosive bath, such as a diluted NaOH bath at an elevated temperature, where the aluminum is etched from the surface only where there is no local protective overlaying of resist
Implementation Method 4
coating a web of polyester with an ultraviolet radiation-curable varnish and bringing a nickel holographic shim into contact with the varnish while a UV light cures, or hardens the varnish
Data Source
AI summary
A method of generating a variable demetallized pattern in a holographic web and a security device using such method. A holographic microstructure pattern is imparted to an oligomer disposed on a surface of a substrate. A metal layer, such as aluminum, is deposited to the holographic microstructure pattern of the substrate and then covered with a variable resist pattern. The variable demetallized pattern in the holographic web is then generated by removing the metal layer not covered by said variable resist pattern.