Recyclable PET Composite Panels for Refrigerated Vehicle Bodies
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Solution Overview
Problem
Refrigerated vehicle body assemblies often use non-recyclable materials, leading to environmental issues due to the irreversible assembly of panels and limited lifespan, resulting in premature disposal.
Innovation Solution
The use of composite panels with internal and external skins made from recycled or non-recycled PET matrices embedded with fibers, allowing for easy recycling by crushing without separating layers, and the assembly of these panels with a PET foam core for thermal insulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If non-recyclable materials (polystyrene, polyurethane foams, thermosetting polyester) are used in panels, then manufacturing cost and structural performance are maintained, but environmental friendliness and recyclability deteriorate
Solution Approach 1:
The patent changes the material parameter from non-recyclable thermosetting polymers to recyclable thermoplastic PET. This parameter change enables the panels to be recyclable while maintaining structural performance and manufacturing cost-effectiveness, directly resolving the contradiction between ease of manufacture and environmental friendliness
Solution Approach 2:
The patent uses composite materials consisting of PET matrix combined with reinforcing fibers (glass, carbon, or natural fibers). This composite structure maintains the mechanical strength and structural performance of traditional panels while enabling recyclability, thus resolving the contradiction between manufacturing cost and environmental friendliness
2Strength
If irreversible assembly of different layers is used in panels, then structural integrity is maintained, but recyclability and ease of disassembly deteriorate
Solution Approach 1:
The patent segments the panel into distinct layers (outer skin, core, inner skin) that can be easily separated. The use of thermoplastic PET as bonding material allows these segments to be detached through melting or decomposition, enabling recyclability while maintaining structural integrity during use, thus resolving the contradiction between strength and ease of operation
Solution Approach 2:
The patent introduces dynamic reversibility to the assembly process. The thermoplastic PET bonding material transitions from a strong bonded state during use to a separable state during recycling through heating or melting. This dynamic property allows the structure to maintain integrity when needed but become easily disassemblable for recycling, resolving the contradiction between structural integrity and recyclability
3Reliability
If limited lifespan (10-20 years) is imposed on refrigerated boxes per ATP agreement, then regulatory compliance is maintained, but waste generation and environmental impact increase
Solution Approach 1:
The patent implements a recover and reuse system where PET panels are collected after their service life, crushed into flakes, and reprocessed into new panels. This closed-loop system allows continuous recovery of the PET material, significantly reducing waste generation while maintaining regulatory compliance through proper material tracking and processing, thus resolving the contradiction between reliability and loss of substance
4Ease of manufacture
If crushed panels are recycled without separating layers, then recycling cost and complexity are reduced, but material purity and quality may deteriorate
Solution Approach 1:
The patent uses homogeneous PET material throughout all layers (outer skin, core, inner skin), which allows the entire panel to be crushed and recycled together without requiring separation. The uniform PET composition ensures that recycled material maintains adequate purity and quality for reuse, resolving the contradiction between recycling cost and material purity by making homogeneity the enabling factor
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 solution enables the creation of an environmentally friendly and cost-effective refrigerated vehicle body assembly that is easily recyclable, reducing waste and extending the lifespan of the panels while maintaining effective thermal insulation for perishable goods transport.
Implementation Method 1
a core of polyethylene terephthalate foam
Data Source
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AI summary
The invention relates to a body assembly (12) for a refrigerated vehicle comprising a composite wall (16, 22) including at least one composite panel (30), the composite panel comprising an inner surface (30A), delimiting at least a portion of a refrigerated compartment (26), and an outer surface (30B), separating the body assembly from the vehicle's external environment, the composite panel comprising, from its inner surface to its outer surface, an inner skin (31), a core (32) made of polyethylene terephthalate (PET) foam, and an outer skin (33). The outer skin (33) defines the outer surface (30B) of this composite panel. The inner skin (31) of this composite panel is made of a composite material (35) comprising fibers embedded in a PET matrix, and the outer skin (33) of this composite panel is made of a composite material (35) comprising fibers embedded in a PET matrix.