Residual Product Weight Testing for Plastic Recycling
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Solution Overview
Problem
Current methods for determining the eligibility of plastic product packages for recycling are qualitative and subjective, leading to uncertainty and potential issues in recycling processes due to food contamination, which can cause discoloration or odor in recycled materials.
Innovation Solution
A method for quantitatively measuring residual product weight on plastic packages by emptying, rinsing with solvents, and calculating the percent residual product weight using the formula (percent residual product weight = (W1 - W2) / W1 * 100%, where W1 is the initial weight and W2 is the final weight after rinsing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If qualitative assessment methods are used to determine recycling eligibility, then the labeling process is simple, but the measurement precision and reliability are poor leading to uncertainty
Solution Approach 1:
The testing method is segmented into distinct sequential steps: emptying the package, drying the package, weighing the empty package, and calculating residual weight. This segmentation transforms a complex qualitative assessment into manageable quantitative measurements, improving precision while maintaining procedural clarity
Solution Approach 2:
The patent replaces subjective qualitative assessment with objective quantitative measurement using weighing equipment. This substitution of mechanical measurement systems for human judgment eliminates uncertainty and improves measurement precision and reliability
2Productivity
If packages with residual food products are recycled, then recycling productivity is maintained, but harmful factors such as odors and discoloration occur in recycled materials
Solution Approach 1:
The patent performs preliminary weighing and assessment of residual product weight before recycling. By measuring and documenting the residual weight in advance, packages can be sorted or pre-treated to remove harmful contamination levels, preventing odors and discoloration while maintaining recycling throughput for eligible packages
Solution Approach 2:
The patent establishes quantitative parameter thresholds for residual product weight to determine recycling eligibility. By changing from qualitative judgment to quantitative parameter-based decision making, the system can objectively identify packages that meet recycling criteria, separating harmful contaminated packages from acceptable ones
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
Provides an objective standard for determining plastic package eligibility for recycling, ensuring high purity and reducing the risk of reprocessing challenges by removing residual products effectively.
Implementation Method 1
rinsing with one or more solvents to remove substantially all of the residual amount of product from the plastic product package
Data Source
AI summary
Provided are methods for measuring residual amount of product remaining on a plastic product package for qualification of entry into a recycling program, the method including: determining whether a residual amount of product from the plastic product package is less than a qualifying amount for entry into the recycling program, where the plastic product package comprises a plastic package and the amount of residual product.