High Density Plastic Card Core Layer for Weight and RFID
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Solution Overview
Problem
Metal-based financial transaction cards are costly to produce and personalize, pose risks of electrostatic discharge, and interfere with radio-frequency identification (RFID) functionality due to their conductive nature, making them incompatible with standard plastic card manufacturing processes and equipment.
Innovation Solution
A plastic card with a core layer composed of a compounded composite material formed by mixing high-density particles (such as metal or mineral powders) with a thermoplastic base, achieving increased weight without electrical conductivity, allowing for standard manufacturing processes and maintaining RFID functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If a metal layer is added to a card body to achieve metal-like weight and feel, then the card weight increases to 12-15 grams, but the card becomes electrically conductive causing electrostatic discharge risks and interfering with RFID functionality
Solution Approach 1:
The patent copies the desirable property of metal (high density/weight) using a non-conductive alternative. High density plastic particles are incorporated into the card body to achieve metal-like weight (12-15 grams) without the harmful electrical conductivity, thus preventing electrostatic discharge risks while maintaining the prestige appearance and feel
Solution Approach 2:
The patent changes the material parameter from conductive metal to non-conductive high density plastic, maintaining the density parameter (achieving 12-15 grams weight) while eliminating the harmful electrical conductivity property. This parameter substitution resolves the contradiction between achieving metal-like weight and avoiding electrostatic discharge
2Weight of moving object
If a metal layer is added to a card body to achieve metal-like weight and feel, then the card weight increases to 12-15 grams, but the card becomes incompatible with standard plastic card manufacturing processes and equipment
Solution Approach 1:
The patent changes the material state from solid metal layer to dispersed high density plastic particles within the thermoplastic matrix. This allows the material to be processed using standard plastic card manufacturing techniques (extrusion, injection molding, lamination) rather than requiring specialized metal processing equipment, thus resolving the manufacturing compatibility issue while maintaining high weight
Solution Approach 2:
The patent creates a composite material system where high density plastic particles are embedded in a thermoplastic matrix. This composite approach enables the use of conventional plastic processing equipment and methods to manufacture cards with metal-like weight, avoiding the need for specialized metal card manufacturing processes
3Weight of moving object
If a metal layer is added to a card body to achieve metal-like weight and feel, then the card weight increases to 12-15 grams, but the production cost increases significantly
Solution Approach 1:
The patent replaces expensive metal materials with cheaper high density plastic particles. The composite material can be manufactured using cost-effective thermoplastic processing methods, significantly reducing production costs while achieving the same 12-15 gram weight target. The high density particles are incorporated during standard plastic processing, avoiding costly metal processing steps
Solution Approach 2:
The patent uses a composite material approach combining affordable high density plastic particles with thermoplastic resin. This composite can be produced through conventional plastic processing techniques at lower cost than metal cards, while achieving metal-like weight and appearance. The composite material enables cost-effective manufacturing without sacrificing the prestige qualities
4Weight of moving object
If a metal layer is added to a card body to achieve metal-like weight and feel, then the card weight increases to 12-15 grams, but RFID operation is interfered with due to metallization
Solution Approach 1:
The patent copies the beneficial property of metal (high density for weight and appearance) while eliminating the harmful property (electrical conductivity that interferes with RFID). High density plastic particles provide the same visual and tactile prestige qualities as metal but do not attenuate electromagnetic fields, thus enabling seamless RFID functionality
Solution Approach 2:
The patent changes the material parameter from conductive metal to non-conductive high density plastic, maintaining the density parameter for weight (12-15 grams) while eliminating electrical conductivity. This substitution removes the harmful RFID interference effect while preserving the desirable weight and appearance properties
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 provides a cost-effective, non-conductive card that mimics the weight and feel of metal cards while preventing electrostatic discharge and ensuring seamless RFID operation, compatible with standard card manufacturing equipment and processes.
Implementation Method 1
particles of a 'native' or 'base' thermoplastic material having a relatively low density (e.g. less than 2 grams/cm3) is compounded with a high density material (e.g., more than 8 grams/cm3) to form a resultant composite material having an 'increased' intermediate, density
Data Source
AI summary
High density metal or mineral particles, sized to be less than 10 microns, are compounded into a base plastic layer to form a compounded composite layer used to form the core layer of the card, any layer of the card or the entire card. The amount of high density particles compounded into the plastic layer is controlled so the card: (a) is at least twice as heavy as any standard PVC card; (b) can be manufactured using standard current plastic card equipment and tooling. (c) is not brittle; and (d) is electrically non-conductive whereby it is not subject to electrostatic discharge properties. The card can include RFID functionality integrated into the card body. The compounded composite layer does not interfere with the integrity of the data communication between an RFID chip packaged in an antenna module and coupled with an embedded booster antenna, and a contactless reader or terminal.