Laminated Glass Wedged Interlayer Heat Shielding
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Solution Overview
Problem
Increasing the amount of heat shielding agents in laminated glass interlayers to enhance heat shielding properties leads to decreased visible light transmittance, potentially compromising safety standards and visibility.
Innovation Solution
A laminated glass design featuring glass plates with a wedged cross-section and an interlayer containing a heat shielding agent, where the interlayer has a wedge angle of 0.2 mrad or less and the total solar transmittance is 60% or less, ensuring high heat shielding while maintaining visible light transmittance and preventing double images in head-up displays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the amount of heat shielding agent in the interlayer is increased to enhance heat shielding property, then the heat shielding property is improved, but the visible light transmittance is decreased
Solution Approach 1:
The interlayer is designed with a wedged shape where the thickness varies locally - thinner at the top and thicker at the bottom. This allows the heat shielding agent to be concentrated where it is most needed (bottom portion) while maintaining sufficient visible light transmittance in the upper portion where drivers view the road.
Solution Approach 2:
The patent specifies precise parameter ranges: the interlayer wedge angle is controlled at 0.2 mrad or less, and the total solar transmittance is maintained at 60% or less. These parameter optimizations balance heat shielding effectiveness with visible light transmittance requirements.
2Temperature
If the interlayer thickness is increased to improve heat shielding, then the heat shielding property is improved, but the visible light transmittance in the upper part is decreased
Solution Approach 1:
Rather than uniformly increasing interlayer thickness, the patent applies a wedged configuration where thickness varies by location. The interlayer is thinner at the top (maintaining visibility) and thicker at the bottom (enhancing heat shielding), optimizing both functions simultaneously.
Solution Approach 2:
The solution transitions from a uniform two-dimensional interlayer to a three-dimensional wedged structure with varying thickness. This dimensional change allows differential functionality across the interlayer - superior heat shielding at the bottom while preserving visibility at the top.
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 enhances heat shielding properties while maintaining high visible light transmittance, ensuring safety standards are met and reducing the occurrence of double images in head-up displays.
Implementation Method 1
the interlayer including a heat shielding agent
Implementation Method 2
at least one of the glass plates having a cross section with a wedged shape
Data Source
AI summary
A laminated glass includes a pair of glass plates; and an interlayer located between the glass plates. At least one of the glass plates has a cross section with a wedged shape, and an entire amount of iron in terms of Fe2O3 in the glass plate having the cross section with the wedged shape is 0.75 mass % or less. The interlayer includes a heat shielding agent, and has a cross section with a wedge angle of 0.2 mrad or less. A total solar transmittance, defined by ISO 13837A, of the laminated glass is 60% or less.