Insulation Sheets from Unseparated Post-Consumer Plastic Mixtures
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Solution Overview
Problem
The low recycling rate of post-consumer plastics due to the difficulty in separating incompatible types, leading to inferior product properties when using unseparated mixtures, and the need for a process to utilize unseparated mixtures of post-consumer plastic articles for commercially viable products.
Innovation Solution
A process involving the crushing of post-consumer plastic articles into flakes, followed by melt-blending or size reduction to create a homogeneous mixture of polystyrene, polyethylene terephthalate, and high-density polyethylene, which is then compression molded into insulation sheets with specific thermal conductivity properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If post-consumer plastic articles are separated by type, then product properties improve, but process complexity and cost increase
Solution Approach 1:
The patent combines multiple incompatible plastic types (PET, PS, HDPE) into a single composite insulation product. Instead of separating plastics by type, the invention merges them into a homogeneous mixture that is then molded into insulation sheets with consistent thermal performance properties.
Solution Approach 2:
The invention creates a composite material consisting of a mixture of different plastic types (PET, PS, and HDPE) that work together to provide thermal insulation. The composite nature of the material allows utilization of unseparated post-consumer plastic waste while achieving reliable insulation performance.
2Ease of manufacture
If unseparated plastic mixtures are used, then recycling cost decreases, but product quality deteriorates
Solution Approach 1:
The invention changes the physical state and composition parameters of the plastic mixture by melting and reprocessing the unseparated plastics. This transformation allows the creation of a homogeneous material with consistent thermal conductivity properties, thereby improving product quality while maintaining low processing costs.
Solution Approach 2:
The composite material approach allows the use of unseparated plastic mixtures to create a product with reliable insulation properties. The specific formulation (PET, PS, and HDPE in defined ratios) ensures that the composite achieves target thermal conductivity while utilizing low-cost unseparated feedstock.
3Manufacturing precision
If complete separation of plastics is implemented, then product consistency improves, but recycling feasibility decreases
Solution Approach 1:
The invention merges different plastic types into a unified product without requiring complete separation. By combining PET, PS, and HDPE into a single molded product, the process maintains high productivity and recycling feasibility while achieving sufficient product consistency for insulation applications.
Solution Approach 2:
The melt-processing step changes the physical parameters of the plastic mixture, creating a homogeneous material that achieves consistent product properties. This parameter change occurs during reprocessing rather than during separation, thereby maintaining recycling feasibility while achieving manufacturing precision.
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 resulting insulation sheets exhibit thermal conductivity values suitable for various applications, providing a cost-effective solution for thermal insulation without the need for complete separation of plastic types, thereby incentivizing higher recycling rates and reducing landfill waste.
Implementation Method 1
the flakes in the mixture are melt-blended, or the flakes in the mixture are further reduced in size. Both procedures can be used to provide a homogeneous mixture of plastic material
Implementation Method 2
the homogeneous mixture of plastic material having the composition hereinbefore specified is compression molded into insulation sheets
Data Source
AI summary
A process for the preparation of thermal insulation sheets fashioned from certain unseparated mixtures of post-consumer plastic articles and the article, itself, is disclosed. The mixtures of such articles contain polyethylene terephthalate (PET) and polystyrene (PS) and optionally also articles made of high density polyethylene (HDPE). An unseparated mixture of such articles is provided. This mixture is crushed and shredded to form plastic flakes, and these plastic flakes are then homogenized. Homogenization of the flakes can be carried out either by melt-blending them or by further comminution to produce very fine particles of the mixed plastics. The resulting homogenized mixture of plastic types is then compression molded into sheets ranging in thickness from about 3 to 10 mm.