Laminate Card Structure With Hidden Recording Medium Boundaries
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Solution Overview
Problem
The forgery of various cards and products such as security cards, financial settlement cards, and identification cards is a significant problem that affects brand reputation and user safety, necessitating improved forgery prevention measures.
Innovation Solution
A laminate structure comprising a base material, an intermediate layer with an accommodation part, and an overlay layer, incorporating a color development layer with electron donating and accepting properties, bonded by thermal adhesives, which changes color irreversibly upon external stimulus to enhance forgery prevention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a color development layer with electron donating and accepting properties is used, then the forgery preventing property is improved, but the manufacturing complexity increases
Solution Approach 1:
The laminate is divided into multiple functional layers: base material, intermediate layer with accommodation part, recording medium with color development layer, and overlay layer. This segmentation allows each layer to perform its specific function while simplifying the overall manufacturing process by enabling separate production and assembly of components.
Solution Approach 2:
The recording medium uses a composite color development layer containing both electron donating compounds and electron accepting compounds, along with a matrix resin. This composite structure enables the color change function while maintaining manufacturability through established lamination and bonding techniques.
2Ease of manufacture
If the base material, intermediate layer, and overlay layer contain the same type of resin material and are bonded by fusion, then the manufacturing ease is improved, but the bonding strength may be reduced
Solution Approach 1:
The base material, intermediate layer, and overlay layer all contain the same type of resin material (polycarbonate, polyester, or polyamide). This homogeneity enables fusion bonding without requiring additional adhesives or complex bonding processes, simplifying manufacturing while achieving sufficient bonding strength through the compatibility and melting characteristics of the identical resin materials.
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 laminate structure effectively prevents forgery by making it difficult to visually recognize the boundary between the recording medium and the intermediate layer, thereby improving the forgery preventing property.
Implementation Method 1
the recording medium includes a color development layer containing: a coloring compound having an electron donating property; a developer having an electron accepting property
Implementation Method 2
the base material and the intermediate layer are bonded to each other by fusion, and the intermediate layer and the overlay layer are bonded to each other by fusion
Data Source
AI summary
A laminate is provided and includes a base material; an intermediate layer provided on the base material and having an accommodation part; a recording medium provided in the accommodation part; and an overlay layer provided on the intermediate layer. The accommodation part is provided in a part of a plane of the intermediate layer, and the accommodation part is a through hole penetrating in the thickness direction of the intermediate layer or a recess recessed in the thickness direction of the intermediate layer. The recording medium includes a color development layer containing: a coloring compound having an electron donating property; a developer having an electron accepting property; and a matrix resin. The base material, the intermediate layer, and the overlay layer contain the same type of resin material.