Metal Surface Card with Molded Polymer Interlayer
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Solution Overview
Problem
Metal surface cards face issues with delamination due to dissimilar expansion rates of materials, difficulty in embedding payment modules, and connecting electronic components, particularly with the metal surface obstructing antenna connections.
Innovation Solution
A molded card design featuring a metal surface with a rear layer and a molded polymer material sandwiched between, using interlocking shapes to retain the metal insert and prevent shorting, with apertures filled with polymer to accommodate payment modules and electronic components, ensuring secure bonding and insulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If metal surface card uses laminated plastic films bonded to metal with adhesives, then the card achieves metal surface appearance and structure, but the bond between metal and plastic layers is susceptible to delamination due to dissimilar expansion rates from temperature, moisture absorption or mechanical bending
Solution Approach 1:
A molded polymer material is introduced as an intermediary layer between the metal insert and the rear layer. This polymer layer acts as a buffer that accommodates the dissimilar expansion rates between metal and plastic materials, preventing delamination while maintaining the structural integrity of the card.
Solution Approach 2:
The card employs a composite structure consisting of metal insert, molded polymer material, and rear layer. This multi-material construction allows each material to perform its optimal function while the molded polymer material specifically addresses the compatibility issue between metal and plastic through its intermediate properties.
2Strength
If metal surface card uses solid metal surface, then the card achieves durability and prestige appearance, but embedding payment module and connecting electronic components becomes difficult due to metal obstruction
Solution Approach 1:
The card is segmented into distinct functional layers: a metal insert providing durability and appearance, a molded polymer material providing embedding space and insulation, and a rear layer for additional functionality. This segmentation allows the payment module to be embedded in the polymer layer without interference from the metal surface.
Solution Approach 2:
The molded polymer material serves as an intermediary embedding medium that allows payment modules and electronic components to be integrated without direct contact with the metal insert. This intermediary layer facilitates manufacturing while preserving the metal surface's structural benefits.
3Shape
If metal surface card uses continuous metal layer, then the card achieves aesthetic appearance, but antenna connections are obstructed and electronic component connections become difficult
Solution Approach 1:
The card structure is divided into separate functional zones where the metal insert provides aesthetic appearance in visible areas, while the molded polymer material creates connection zones that allow antenna and electronic component integration without metal interference.
Solution Approach 2:
The molded polymer material acts as an intermediary that enables antenna connections and electronic component integrations by providing a non-conductive pathway between the metal insert and the electronic components, eliminating the obstruction problem while preserving the metal surface appearance.
4Device complexity
If metal surface card uses laminated structure with adhesives, then the card achieves layered construction, but the bond is susceptible to delamination from temperature, moisture absorption or mechanical bending
Solution Approach 1:
The molded polymer material serves as an intermediary layer between the metal insert and rear layer, specifically designed to accommodate differential expansion and contraction from temperature changes, moisture absorption, and mechanical bending, thereby preventing delamination.
Solution Approach 2:
The polymer material's physical parameters (flexibility, thermal expansion coefficient, moisture absorption) are selected to bridge the gap between metal and plastic properties, allowing the layered structure to maintain bond integrity under varying environmental and mechanical conditions.
Data Source
AI summary
A metal surface card in which the metal surface is formed by a metal insert configured to be retained by interlocking shapes of the metal insert and molded polymer material sandwiched between the metal insert and an opposing surface of the card which is not metal.