Compartmentalized Pellet for RPET Contaminant Extraction
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Solution Overview
Problem
Conventional recycling processes for post-consumer recycled polyester (RPET) are inefficient in removing contaminants, particularly toxic substances, and require additional steps like fine grinding or re-polymerization, which increase costs and limit contaminant removal effectiveness.
Innovation Solution
A compartmentalized pellet structure with a contaminated thermoplastic polymer outer compartment and an uncontaminated polymer inner compartment is developed, where contaminants are extracted by maintaining the pellets in a specific temperature range and using a vacuum or vapor environment, enhancing surface area exposure for efficient contaminant removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional recycling processes are used to remove contaminants from RPET, then some contaminants are removed, but toxic contaminants remain and additional processing steps are required
Solution Approach 1:
The RPET material is divided into two distinct compartments: an outer compartment containing contaminated polymer and an inner compartment containing uncontaminated polymer. This segmentation allows selective exposure of only the contaminated outer portion to extraction treatments, improving contaminant removal efficiency while reducing the need for extensive reprocessing of the entire material volume.
Solution Approach 2:
The invention employs extraction processes using solvents or supercritical fluids to remove toxic contaminants from the contaminated outer compartment of the RPET. By targeting only the contaminated portion rather than the entire material, the extraction process becomes more effective and requires fewer additional processing steps compared to conventional methods.
2Object-affected harmful factors
If fine grinding or re-polymerization steps are added to remove contaminants, then contaminant removal effectiveness improves, but processing costs and complexity increase
Solution Approach 1:
The compartmentalized structure is created during the initial recycling process, separating contaminated and uncontaminated portions before extraction treatment. This preliminary action eliminates the need for subsequent fine grinding or re-polymerization steps that would otherwise be required to achieve adequate contaminant removal, thereby reducing processing costs and complexity.
Solution Approach 2:
The extraction treatment is applied selectively to the contaminated outer compartment rather than the entire RPET material. This localized approach achieves effective toxic contaminant removal from the problematic portion while preserving the uncontaminated inner compartment, avoiding the need for expensive and complex fine grinding or re-polymerization processes.
3Object-affected harmful factors
If the entire RPET material is subjected to extraction treatment, then contaminant removal is maximized, but processing time and cost increase
Solution Approach 1:
By segmenting the RPET into contaminated outer and uncontaminated inner compartments, the extraction treatment can be applied only to the contaminated portion. This reduces the total volume requiring treatment, thereby maximizing contaminant removal effectiveness while minimizing processing time and associated costs.
Solution Approach 2:
The invention applies extraction treatment partially—only to the contaminated outer compartment rather than the entire RPET material. This partial action is sufficient to achieve the required contaminant removal levels while significantly reducing processing time and cost compared to treating the full material volume.
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 effectively reduces contaminant levels in RPET, making it suitable for food-grade applications without the need for additional processing steps like fine grinding or re-polymerization, thereby improving the efficiency and cost-effectiveness of the recycling process.
Implementation Method 1
maintaining the pellets in a specific temperature range and using a vacuum or vapor environment, enhancing surface area exposure for efficient contaminant removal
Implementation Method 2
maintaining the pellets in a specific temperature range and using a vacuum or vapor environment, enhancing surface area exposure for efficient contaminant removal
Implementation Method 3
using a vacuum or vapor environment, enhancing surface area exposure for efficient contaminant removal
Data Source
AI summary
This invention is to an improved method for cleaning contaminated polymer when that polymer is to be blended with clean material. The method involves combining the contaminated material and the clean material in a compartmentalized pellet wherein the contaminated material is placed in the outermost compartment, the clean material is placed in an inner compartment and then subjecting the pellet to an extraction process.