Recycled Copolyester Roofing Panels Balancing Durability and Weight
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Solution Overview
Problem
Existing plastic roofing and wall materials face challenges in durability, sustainability, and meeting requirements such as resistance to weathering, UV radiation, fire resistance, and mechanical stability, while also needing to manage weight and cost-effectiveness, particularly in the use of recycled plastics.
Innovation Solution
A recycled plastic panel composed of at least 30% glycol-modified polyethylene terephthalate (PET-G) and/or glycol-modified polycyclohexylenedimethyl terephthalate (PCT-G) with additives like an antiblocking agent, combined with optional recycled acrylonitrile butadiene styrene (ABS) for enhanced properties, is used to create profiled or translucent sheets that meet these demands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If recycled plastics are used to produce roofing and wall materials, then sustainability is improved, but durability and resistance to weathering/UV radiation deteriorate
Solution Approach 1:
The patent changes the chemical composition parameters of the recycled plastic by incorporating specific proportions of recycled PET-G (at least 30% by mass) combined with other recycled plastics and additives. This parameter modification enables the material to achieve both sustainability goals and improved durability, weathering resistance, and UV radiation resistance while maintaining mechanical stability.
2Reliability
If recycled plastics are used to produce roofing and wall materials, then sustainability is improved, but mechanical stability deteriorates
Solution Approach 1:
The patent creates a composite material system by combining recycled PET-G with other recycled plastics (such as PP, PE, PS, ABS) and functional additives. This composite approach allows the material to achieve both sustainability objectives and adequate mechanical stability for roofing and wall applications, overcoming the limitations of single-recycled-plastic formulations.
3Strength
If plastic roofing sheets are made from rigid polymers, then mechanical stability is improved, but weight increases
Solution Approach 1:
The patent modifies the material parameters by using recycled PET-G and other lightweight recycled plastics instead of traditional heavy rigid polymers. This parameter change achieves the desired mechanical stability while reducing the weight per unit area, making the roofing sheets more competitive with tile roofs and easier to install.
4Ease of operation
If plastic roofing sheets are made from translucent or opaque plastic, then ease of installation is improved, but fire resistance deteriorates
Solution Approach 1:
The patent introduces fire-retardant additives as intermediary substances within the recycled plastic composite. These additives act as mediators that enhance fire resistance without compromising the ease of installation, translucency, or opacity properties of the roofing sheets. The additives work within the material matrix to provide fire protection while maintaining the installation advantages of plastic materials.
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 solution provides durable, sustainable, and cost-effective recycled plastic panels that meet mechanical, weathering, and fire resistance requirements, with improved heat resistance and reduced weight, contributing to the circular economy by utilizing post-industrial waste.
Implementation Method 1
melting the material blend to a material melt
Implementation Method 2
extruding the material melt by means of an extrusion die into a flat material web
Implementation Method 3
at least smoothing and optionally embossing and/or forming the flat material web by means of at least smoothing rollers
Data Source
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AI summary
The invention relates to a recycled plastic panel for use as a roof element and/or wall element, wherein the recycled plastic panel comprises a copolyester, and the recycled plastic panel as copolyester comprises at least 30.0% by mass, in particular at least 50.0% by mass, recycled glycol-modified polyethylene terephthalate and/or recycled glycol-modified polycyclohexylenedimethyl terephthalate, and as an additive an antiblocking agent with up to 0.5% by mass. The invention further relates to a method for manufacturing a recycled plastic panel. Thus, a profiled recycled panel can be provided from a blend of recycled plastics.