RFID-Based Recyclable Material Quality Assessment
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Solution Overview
Problem
The existing material sorting processes in municipal solid waste and recycling facilities are inefficient, expensive, and prone to errors due to their material-specific nature, leading to contamination of recyclable materials and a decline in the quality of sorted commodities.
Innovation Solution
A computer-implemented system and method that uses RFID technology to read identifiers on items, determine the relative quantity and weight of recyclable materials, and compute their quality, allowing for adjustments in the sorting process to improve purity and reduce contamination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If material-specific sorting processes are used, then sorting accuracy for specific materials is improved, but device complexity and cost increase
Solution Approach 1:
The patent applies universality by using a single RFID reader system that can identify multiple types of recyclable materials (paper, plastic, metal, glass) through a common identification mechanism. Instead of deploying separate optical devices for each material type, the system uses one multi-functional RFID reader that reads identifiers on all material types, thereby reducing device complexity while maintaining sorting accuracy across diverse materials.
Solution Approach 2:
The patent replaces mechanical and optical sorting systems with an electromagnetic field-based RFID identification system. Traditional optical devices use line-of-sight light detection, while eddy-current systems use electromagnetic induction for metals; the RFID system uses electromagnetic fields to read identifiers without line-of-sight requirements, eliminating the need for complex mechanical positioning and optical alignment mechanisms.
2Adaptability or versatility
If manual sorting is used, then flexibility in handling different materials is improved, but productivity and efficiency decrease
Solution Approach 1:
The system applies self-service by enabling automatic identification and sorting of materials through RFID readers that autonomously read identifiers on items as they pass through the sorting facility. The computer system automatically processes the identifier data, determines material types, and controls diverting mechanisms without human intervention, thereby maintaining the flexibility of handling various materials while dramatically increasing productivity compared to manual sorting.
Solution Approach 2:
The system implements feedback by using RFID readers to continuously identify materials, with the computer system processing this information in real-time to control sorting mechanisms. The system receives identifier data, determines material types, and adjusts sorting actions based on this feedback loop, enabling automatic adaptation to different material types while maintaining high-speed processing capability.
3Speed
If optical identification systems are used, then identification speed is improved, but measurement precision decreases due to false identifications and line-of-sight limitations
Solution Approach 1:
The patent replaces optical line-of-sight identification with RFID electromagnetic field-based identification. RFID readers can read identifiers through non-line-of-sight means, penetrating containers and packaging materials without requiring direct visual contact. This substitution eliminates false identifications caused by optical limitations while maintaining high identification speeds through rapid electromagnetic signal exchange.
4Manufacturing precision
If sorting processes are made more thorough to reduce contamination, then quality of sorted materials is improved, but loss of time and increased operational complexity occur
Solution Approach 1:
The system applies preliminary action by reading RFID identifiers on all items before the sorting decision is made. The RFID reader captures identification data in advance as items enter the sorting zone, allowing the computer system to process this information and prepare sorting actions without delaying the actual sorting process. This preliminary identification ensures high sorting accuracy while maintaining rapid processing speed.
Solution Approach 2:
The system implements continuity of useful action by maintaining continuous RFID identification and sorting operations without interruption. The RFID readers continuously read identifiers as items pass through, the computer system continuously processes this data stream, and the sorting mechanisms continuously divert items based on real-time identification. This continuous operation ensures thorough sorting for high quality while preventing time losses from batch processing or intermittent operations.
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 system provides an accurate and verifiable measurement of the quality of recyclable materials, enhancing the efficiency and effectiveness of the sorting process by reducing contamination and improving the quality of sorted commodities.
Implementation Method 1
a reader 128 for reading an identifier respectively associated with at least some of the total number of items
Data Source
AI summary
Systems and methods for determining a relative quantity of recyclable items, wherein the calculation is determined based on a total number of items. In one embodiment of the present invention, a computer-implemented method includes reading an identifier respectively associated with at least some of a total number of items. The computer determines a number of identifiers associated with the recyclable items. The computer also receives the total number of items, and computes the relative quantity of recyclable items by dividing the number of identifiers associated with the recyclable items by the total number of items.