Laminated Glazing Interlayer with Segmented Light Diffusing Layer
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Solution Overview
Problem
Existing laminated glazing technologies for automotive and architectural applications lack optimal light performance, thermal stability, and optical properties, particularly in terms of haze, transparency, and transmissibility.
Innovation Solution
A laminated glazing structure comprising two sheets of glass bonded by a thermoplastic interlayer, which includes a polyvinyl acetal film with reduced plasticizer content, a low refractive index layer, and a light diffusing layer in direct contact with one glass sheet, enhancing light outcoupling and optical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If light diffusing particles are embedded between two PVB films, then adhesion to glass surfaces is improved, but light outcoupling is reduced
Solution Approach 1:
The interlayer is segmented into three distinct functional zones: a first PVB layer for adhesion to the first glass surface, a light diffusing layer with particles for light scattering, and a second PVB layer for adhesion to the second glass surface. This segmentation allows each layer to optimize its specific function without compromising the others.
Solution Approach 2:
Different regions of the interlayer structure are assigned different properties: the PVB layers provide adhesion and flexibility, while the light diffusing layer provides light scattering. The light diffusing particles are localized in the central layer rather than distributed throughout the entire interlayer, creating local quality variations that optimize both adhesion and light outcoupling.
2Manufacturing precision
If plasticizer content in PVB film is reduced, then surface smoothness and print quality are improved, but film flexibility and adhesion are reduced
Solution Approach 1:
The interlayer is divided into plasticizer-free PVB layers for printing and plasticized PVB layers for adhesion. The first and second PVB layers have reduced or no plasticizer content to provide smooth surfaces for light diffusing layer application, while the third PVB layer contains plasticizer to ensure flexibility and adhesion to glass surfaces.
Solution Approach 2:
The plasticizer content parameter is varied across different layers of the interlayer structure. The outer PVB layers have low or zero plasticizer content (0-5 wt%) for surface smoothness, while the inner PVB layer has higher plasticizer content (15-40 wt%) for maintaining flexibility and adhesion properties.
3Illumination intensity
If light diffusing layer is placed in direct contact with glass surface, then light outcoupling is improved, but adhesion uniformity is reduced
Solution Approach 1:
The interlayer is segmented into adhesion-optimized PVB layers and a light diffusing layer. The PVB layers serve as interface layers that ensure uniform adhesion to glass surfaces, while the light diffusing layer is positioned between the PVB layers to maximize light outcoupling without directly contacting the glass.
Solution Approach 2:
The PVB layers act as intermediary layers between the glass surfaces and the light diffusing layer. These intermediary PVB layers provide uniform adhesion to the glass while allowing the light diffusing layer to be positioned optimally for light outcoupling, mediating between the requirements for adhesion uniformity and light performance.
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 proposed structure achieves improved light performance, thermal stability, and optical properties, including enhanced haze, transparency, and transmissibility, while allowing for decorative patterns and efficient light guiding.
Implementation Method 1
a light diffusing layer (103) in direct contact with the first glass sheet (101), wherein the light diffusing layer (103) comprises light scattering particles
Implementation Method 2
a low refractive index layer (104) arranged between the polyvinyl acetal film A (102A) and the light diffusing layer (103), having a refractive index of
Data Source
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AI summary
Described is a lamination interlayer and laminate structure which enables the application of optically improved functional layers, structures or patterns, especially for transparent lighting and display applications.