Biodegradable Paper-Plastic Laminate for RFID Shielding
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Solution Overview
Problem
Conventional paper/plastic laminates lack effective electromagnetic shielding capabilities, particularly against RFID frequencies, and are not biodegradable, posing security and environmental concerns.
Innovation Solution
A biodegradable paper/plastic laminate is developed, comprising a polymeric film with a conductive layer and adhesives, which provides electromagnetic shielding from 125 kHz to 3 GHz frequencies, using materials like polyester and conductive metals like aluminum and copper, and adhesives such as 100% solids adhesives for dimensional stability and biodegradability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional paper/plastic laminates are used, then durability and tear resistance are improved, but electromagnetic shielding capability is insufficient and biodegradability is lost
Solution Approach 1:
The patent creates a composite laminate structure consisting of paper web, polymeric film, and conductive material layers. This multi-material composite combines the durability of paper/plastic with the electromagnetic shielding properties of conductive materials (aluminum, copper, or conductive polymers), resolving the contradiction between durability and electromagnetic shielding capability.
2Strength
If conventional plastic laminates are used, then tear resistance is improved, but environmental friendliness deteriorates due to non-biodegradability
Solution Approach 1:
The patent modifies the polymeric film by incorporating biodegradable additives or using biodegradable polymers, changing the chemical composition parameters while maintaining the physical tear resistance properties. This allows the material to remain durable during use but degrade after disposal, resolving the contradiction between strength and environmental impact.
3Quantity of substance
If thin conductive layers are used for shielding, then material usage is reduced, but shielding effectiveness at higher frequencies decreases
Solution Approach 1:
The patent applies conductive material in specific configurations and thicknesses optimized for different frequency ranges. The conductive layer may be applied selectively or in varying thicknesses to address different shielding requirements, allowing reduced material usage while maintaining effectiveness across the target frequency spectrum through localized optimization.
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 offers enhanced tear resistance, dimensional stability, and effective electromagnetic shielding, while being biodegradable, addressing security and environmental issues by preventing unauthorized RFID readings and ensuring eco-friendly disposal.
Implementation Method 1
The laminate material is configured to shield radiation having frequencies from 125 kHz to at least 3 GHz
Implementation Method 2
The top surface of the polymeric film is bonded to a bottom surface of the paper web by an adhesive
Data Source
AI summary
A laminate material comprising a paper web and a polymeric film adhered to the paper web, the polymeric film comprising a biodegradable polymeric material that includes an organic additive.