Metal Plastic Composite Card Lamination Process
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Solution Overview
Problem
The manufacture of cards with both metal and plastic layers faces challenges such as warpage and delamination due to the different responses of these materials to temperature and stress, making it difficult to produce a cost-effective card that combines the prestige of metal with the ease of information encoding on plastic.
Innovation Solution
A method involving lamination of multiple plastic layers to create a dimensionally stable first assembly, which is then attached to a metal layer using an adhesive, with subsequent lamination under controlled temperature and pressure conditions to prevent warping and delamination, allowing for a card with one side of metal and the other of plastic.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a card is made with both metal and plastic layers to combine prestige and functionality, then cost is reduced and ease of information encoding is improved, but warpage and delamination occur due to different responses to temperature and stress
Solution Approach 1:
The plastic layers are pre-laminated and stress-relieved before being combined with the metal layer. This preliminary action removes internal stresses from the plastic material, preventing subsequent warpage when the composite card is manufactured or used.
Solution Approach 2:
The patent applies controlled temperature and pressure parameters during the lamination process to bond the plastic and metal layers while managing thermal expansion differences. By carefully controlling these parameters, the process achieves strong adhesion without causing warpage or delamination.
2Stability of the object's composition
If multiple plastic layers are laminated together to build thickness, then dimensional stability is improved, but the process complexity increases
Solution Approach 1:
Multiple plastic layers are combined into a single laminated assembly that acts as one dimensionally stable component. This merging approach achieves the desired thickness and stability while simplifying subsequent assembly steps with the metal layer.
Solution Approach 2:
The plastic layers are pre-laminated and stress-relieved before being combined with the metal layer. This preliminary action removes internal stresses from the plastic material, rendering it dimensionally stable and simplifying the final assembly process.
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 approach results in a card that is both economical and functional, maintaining dimensional stability and preventing warpage and delamination, enabling decoration and feature integration like magnetic stripes and holograms without compromising structural integrity.
Implementation Method 1
The first assembly is attached to a layer of metal material (e.g., stainless steel) via an adhesive
Implementation Method 2
subjecting the second assembly to a lamination process under predetermined temperature and pressure condition
Data Source
AI summary
A card formed in accordance with the invention includes a first assembly comprised of multiple plastic layers attached via an adhesive to a metal layer. The multiple plastic layers forming the first assembly are laminated under a first selected temperature and pressure conditions to preshrink the multiple plastic layers, stress relieve the first assembly and render the first assembly dimensionally stable. The laminated first assembly is then attached to a metal layer via an adhesive layer to form a second assembly which is then laminated at a temperature below the first selected temperature to form a card which is not subjected to warpage and delamination.