Optical Taggants for Plastic Recycling Identification
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Solution Overview
Problem
Current recycling methods for single-use plastic packaging are inefficient due to the inability to accurately identify and separate materials by manufacturer, leading to limitations in closed-loop recycling and alignment with the circular economy, with existing solutions like fluorescent pigments and RFID chips facing issues such as high costs, UV stability problems, and damage during processing.
Innovation Solution
A method using UV, NIR, and IR readable ink colors and shapes to mark products, allowing for identification and separation at Materials Recovery Facilities, enabling the recovery of materials back to their originating source through a database matching system and artificial intelligence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If fluorescent pigments are used to mark products for recycling identification, then material separation capability is improved, but cost increases and UV stability deteriorates
Solution Approach 1:
The patent changes the spectral parameters of the marking system by using infrared-absorbing pigments instead of traditional fluorescent pigments. This parameter change allows the marks to be detected by infrared sensors, providing both UV stability and accurate material identification without the limitations of fluorescent pigments.
Solution Approach 2:
The patent creates optical copies of identification information by applying visible and infrared marks that contain encoded data about the product's material composition and manufacturer. These marks serve as information carriers that can be read by detection systems, replacing the need for complex RFID chips while providing similar identification capabilities.
2Loss of information
If RFID chips are used for product tracking, then identification capability is improved, but device complexity and susceptibility to damage increase
Solution Approach 1:
The patent extracts the identification function from complex electronic RFID chips and implements it through simple optical marks applied to the product surface. This extraction maintains the tracking and identification capability while eliminating the complexity and fragility of electronic components, making the system suitable for harsh recycling environments.
Solution Approach 2:
The patent uses inexpensive, disposable optical marks instead of expensive, fragile RFID chips. These marks are applied as part of the normal labeling process and can withstand the recycling process, providing a cost-effective solution that doesn't require complex electronics or expensive infrastructure.
3Duration of action of stationary object
If chemical etching is used to mark products, then mark permanence is improved, but adaptability and ease of modification deteriorate
Solution Approach 1:
The patent introduces dynamic adaptability to the marking system by using variable data fields in the optical marks. The marks can be easily modified to include different product information, batch numbers, and recycling codes without requiring changes to the physical marking infrastructure, enabling rapid response to changing recycling requirements.
Solution Approach 2:
The patent creates a universal marking system that serves multiple functions: product identification, material composition indication, manufacturer tracking, and recycling instruction provision. This multi-functional approach eliminates the need for separate marking systems for different purposes while maintaining mark durability through standard application methods.
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 enables efficient and cost-effective separation and recycling of plastics, reducing reliance on virgin polymers, improving recycling rates, and enhancing corporate social responsibility while ensuring regulatory compliance.
Implementation Method 1
The mark comprises a UV, NIR and/or IR readable ink... exposing the product to an excitation condition such that the machine readable code fluoresces... capturing a first image of the fluorescing shape or colour
Implementation Method 2
the machine readable code fluoresces to allow recovery of the machine readable code... capturing a first image of the fluorescing shape or colour
Data Source
AI summary
The method of uniquely identifying a product for subsequent recycling includes marking a surface of the product with a first trace signature being representative of the manufacturer of the product.