Laminate Structure with Irreversible Color Development Against Forgery
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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 recording medium with color development layer is disposed on a base material, then forgery prevention capability is improved, but visual recognition of layer boundaries becomes difficult which may affect manufacturing precision
Solution Approach 1:
An intermediate layer is introduced between the base material and the recording medium to serve as a mediator. This intermediate layer has the same resin material as the base material and overlay layer, creating visual homogeneity that makes layer boundaries invisible, while still providing functional separation and bonding interfaces for precise manufacturing
Solution Approach 2:
The intermediate layer is made of the same resin material as the base material and overlay layer, creating visual and material homogeneity across the laminate structure. This homogeneity conceals the boundaries between layers while maintaining functional differentiation through the accommodation part structure
2Strength
If thermal adhesive is used to bond layers, then bonding strength is improved, but manufacturing complexity increases due to temperature control requirements
Solution Approach 1:
The bonding process utilizes temperature parameter changes to activate the thermal adhesive. By controlling temperature during lamination, strong bonding is achieved between layers while the process remains relatively simple, as temperature is a easily controllable parameter in manufacturing
3Stability of the object's composition
If the accommodation part is made as a through hole or recess, then integration of recording medium is improved, but structural complexity increases
Solution Approach 1:
The intermediate layer is segmented to create an accommodation part (through hole or recess) that specifically houses the recording medium. This segmentation provides functional integration while keeping the overall structure simple, as only one layer needs the complex geometry
Solution Approach 2:
The accommodation part extends in the thickness direction of the intermediate layer, utilizing the third dimension to integrate the recording medium. This vertical integration approach maintains simplicity in the planar dimensions while achieving stable composition through depth
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 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
Implementation Method 2
the base material and the intermediate layer are bonded to each other by a thermal adhesive, and the intermediate layer and the overlay layer are bonded to each other by a thermal adhesive
Implementation Method 3
a recording medium configured to be capable of changing the colored state thereof by an external stimulus
Data Source
AI summary
The laminate 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. 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.