Security Document Foil Durability via Embedded Lacquer Coating
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Solution Overview
Problem
Metallic holographic laminates in security documents face durability issues due to environmental exposure, leading to delamination, and existing improvements in foil material have been unsuccessful in meeting industry demands.
Innovation Solution
A security document structure is developed with a base sheet, a colored coating, a foil laminate embedded between the colored coating and an outer lacquer coating, where the lacquer coating comprises a polymeric resin and includes crosslinking and wetting agents to enhance durability and protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a foil laminate is used in a security document, then security and authenticity indication are provided, but the foil laminate is susceptible to environmental erosion and delamination
Solution Approach 1:
The patent applies a flexible polymer coating film over the foil laminate to create a protective shell that shields the foil from environmental factors such as moisture, oxygen, and physical abrasion. This coating forms a barrier layer that maintains foil integrity while allowing the security document to remain flexible and functional.
Solution Approach 2:
The patent creates a composite structure by combining the foil laminate with a polymer coating material. This composite construction integrates the security properties of the foil with the protective properties of the polymer coating, resulting in a material that resists delamination and environmental degradation while maintaining the security features.
2Reliability
If the foil laminate is protected with a coating, then durability is improved, but the production process becomes more complex
Solution Approach 1:
The patent applies the polymer coating over the foil laminate in a preliminary protective layer that is applied during the manufacturing process. This preliminary action of coating ensures durability is built into the structure before the document enters service, preventing the need for later protective measures or repairs.
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 significantly increases abrasion, chemical, and environmental resistance, protecting the foil laminate from degradation and enhancing security features like embossed profiles for authentication.
Implementation Method 1
an outer lacquer coating over the colored coating such that the foil laminate is embedded between the colored coating and the outer lacquer coating
Implementation Method 2
providing enhanced protection against abrasion, chemicals, and environmental factors
Implementation Method 3
providing enhanced protection against abrasion, chemicals, and environmental factors
Data Source
AI summary
A security document, along with its methods of formation, is provided. The security document may include a base sheet, a colored coating on the base sheet, a foil laminate on at least a portion of the colored coating, and an outer lacquer coating over the colored coating such that the foil laminate is embedded between the colored coating and the outer lacquer coating. The outer lacquer coating may include a polymeric resin, and may also include a crosslinking agent and a wetting agent.