PCR Polyolefin Pellet De-volatilization Process
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Solution Overview
Problem
Current processes for producing PCR polyolefin plastic materials for non-food containers face challenges with container color, unwanted fragrances, cross-contamination, and complexity, limiting their acceptance for household and personal care products due to residual volatiles and stringent purity requirements.
Innovation Solution
The process involves extruding PCR polyolefin flakes into pellets before de-volatilization, using a direct-coupled sequence with a de-volatization vessel that tolerates varying flake sizes and geometries, ensuring complete removal of volatiles like limonene to meet FDA standards for food contact applications, reducing cross-contamination and material handling costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If PCR polyolefin flakes are de-volatized before extrusion, then volatile removal is achieved, but cross-contamination risk and material handling cost increase
Solution Approach 1:
The patent performs extrusion before de-volatization, reversing the conventional sequence. By extruding the PCR flakes first into pellets and then de-volatizing the pellets, the process eliminates the need for separate storage silos and reduces material handling steps, thereby reducing cross-contamination risk and handling costs while still achieving complete volatile removal
Solution Approach 2:
The patent combines the extrusion and de-volatization operations into a single integrated process flow where extruded pellets are directly fed into the de-volatization vessel. This merging of operations eliminates intermediate storage and transfer steps, reducing both complexity and cross-contamination risk
2Productivity
If de-volatization vessel geometries are optimized for specific flake sizes, then de-volatization efficiency is improved, but adaptability to varying flake sizes decreases
Solution Approach 1:
The patent designs the de-volatization vessel with a conical bottom and distributed heating zones that can effectively process pellets of varying sizes and densities. The vessel geometry and airflow distribution are optimized to accommodate a wide range of flake sizes from different sources, making the system universally applicable while maintaining high de-volatization efficiency
Solution Approach 2:
The patent employs adjustable process parameters including temperature profiles, airflow rates, and residence time that can be optimized for different flake sizes. The conical vessel geometry naturally promotes uniform material flow and heating regardless of initial flake size variations, achieving both efficiency and adaptability
3Reliability
If stringent purity requirements are enforced for food contact containers, then safety is improved, but manufacturing complexity and cost increase
Solution Approach 1:
The patent uses a de-volatization process that specifically targets and removes volatile contaminants (such as limonene, detergents, and fragrances) from PCR polyolefin materials. By extracting these harmful volatiles through controlled heating and airflow in a conical vessel, the process achieves FDA-compliant purity levels for food contact applications while maintaining a relatively simple manufacturing setup
Solution Approach 2:
The patent employs oxidative conditions in the de-volatization process to accelerate the removal of organic volatiles and contaminants. The controlled oxidation environment effectively breaks down and removes harmful substances, achieving stringent purity requirements through a straightforward thermal-oxidative process rather than complex multi-step purification
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 results in fragrance-free, FDA-approved pellets with improved throughput and reduced energy consumption, minimizing cross-contamination risks and operational costs while enhancing material handling efficiency.
Implementation Method 1
the de-volatization of flakes, or chips, of a predetermined size in heated stirred bed and fluidized bed vessels for a predetermined time period to produce flakes low or free of volatiles and fragrances
Implementation Method 2
heated stirred bed and fluidized bed vessels
Implementation Method 3
The process involves extruding PCR polyolefin flakes into pellets before de-volatilization
Implementation Method 4
The process involves extruding PCR polyolefin flakes into pellets
Data Source
Figure 1~2
AI summary
A process for producing, from PCR polyolefin feedstock, pellets which are suitable for molding into useful articles suitable for food contact and other applications wherein feedstock fragrances are not desirable.