Laminated Structure with IR Reflective Adhesive
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Solution Overview
Problem
Laminated structures, particularly those with plastic components, experience thermal expansion and warping due to solar radiation, leading to fitting issues and reduced lifespan, despite the use of protective foils.
Innovation Solution
Incorporating 2-10% titanium dioxide infra-red reflective particles into the adhesive layer between a plastic substrate and a decorative foil to reflect away infra-red radiation, reducing thermal expansion and warping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a protective foil is applied to a plastic substrate, then the appearance and solar radiation protection are improved, but thermal expansion and warping still occur due to differential thermal expansion between layers
Solution Approach 1:
An adhesive layer containing infra-red reflective particles (titanium dioxide) is introduced between the protective foil and the plastic substrate. This intermediary layer reflects infra-red radiation away from the substrate, reducing heat absorption and minimizing thermal expansion differences between layers, thereby maintaining dimensional stability while preserving solar radiation protection.
Solution Approach 2:
The adhesive layer's composition is modified by incorporating infra-red reflective particles (2-10% by weight of titanium dioxide). This changes the optical parameters of the adhesive system, enabling it to reflect infra-red radiation and reduce thermal energy transfer to the substrate, thus preventing warping and dimensional changes.
2Illumination intensity
If decorative foils are used to increase reflectance, then solar radiation protection is improved, but thermal expansion differences between layers still cause warping over time
Solution Approach 1:
The adhesive layer with infra-red reflective particles serves as a mediator between the decorative foil and substrate. It reflects infra-red radiation before it can cause thermal expansion in the substrate, reducing stress at the interfaces and preventing delamination, thus extending the service life of the laminated structure.
Solution Approach 2:
The adhesive layer converts harmful infra-red radiation into a beneficial effect by reflecting it away from the substrate. This transforms the potential harm of solar radiation into a protective mechanism that reduces thermal stress and extends the durability of the laminated structure.
3Ease of manufacture
If plastic materials are used for window and door frames, then ease of manufacture and design flexibility are improved, but thermal expansion causes fitting problems over time
Solution Approach 1:
The infra-red reflective adhesive layer acts as a thermal barrier between the plastic frame and the decorative foil. By reflecting infra-red radiation, it reduces heat-induced thermal expansion in the plastic material, maintaining dimensional stability and ensuring continued fitting precision within apertures over the product's service life.
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 effectively delays warping and maintains the structural integrity of windows and doors by reducing heat build-up, extending their usable lifetime and improving fit within apertures by around 30% with reduced heat build-up.
Implementation Method 1
the adhesive layer comprises infra-red reflective particles of titanium dioxide, the infra-red reflective particles forming 2 to 10 per cent of the adhesive layer by weight. By incorporating infra-red reflective particles within the adhesive layer, infra-red radiation from the sun that penetrates the protective layer can be reflected away from the substrate
Data Source
Figure 1
AI summary
There is provided a laminated structure (10), such as a window frame, comprising an adhesive layer (14) disposed between a substrate (12) and a protective layer (16), wherein the adhesive layer (14) comprises infra-red reflective particles (24), such as titanium dioxide. Providing infra-red reflective particles within the adhesive reduces heat build-up in substrate (12).