Laminated Glass Interlayer Film Blue Light Reduction
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Solution Overview
Problem
Conventional interlayer films for laminated glass struggle to achieve low transmittance for light rays with a wavelength of 430 nm while maintaining low excitation purity and high decorativeness, which is essential for various applications.
Innovation Solution
An interlayer film comprising a thermoplastic resin, specifically a polyvinyl acetal resin, combined with yellow and red color-based coloring matters and blue and purple color-based coloring matters, where the ratio of these compounds is optimized to achieve low transmittance and excitation purity, along with the inclusion of ultraviolet ray screening agents and oxidation inhibitors for enhanced performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional interlayer films use single coloring matter to reduce transmittance at 430 nm, then transmittance is reduced, but excitation purity increases and decorativeness is lowered
Solution Approach 1:
The patent combines multiple coloring matters (yellow/red-based and blue/purple-based) in specific ratios to achieve both low transmittance at 430 nm and low excitation purity. This merging of multiple colorants allows the interlayer film to absorb harmful blue light while maintaining decorative appearance and color balance.
Solution Approach 2:
The patent specifies precise parameter ranges for the coloring matters, including maximum absorption wavelengths (yellow/red: 300-550 nm, blue/purple: 550-750 nm) and their ratio (0.03-3 parts by weight). By controlling these parameters, the invention achieves the dual goal of blocking harmful light while maintaining aesthetic quality.
2Object-affected harmful factors
If conventional interlayer films increase coloring matter concentration to block harmful light, then transmittance at 430 nm is reduced, but excitation purity is heightened
Solution Approach 1:
The patent optimizes the concentration parameters of coloring matters within specific ranges (0.03-3 parts by weight of yellow/red-based and 0.01-1 part by weight of blue/purple-based). This parameter control ensures sufficient absorption of 430 nm light while preventing excessive excitation purity that would harm decorativeness.
Solution Approach 2:
The patent applies different coloring matters with specific absorption characteristics to different wavelength ranges. Yellow/red-based coloring matters target shorter wavelengths while blue/purple-based coloring matters target longer wavelengths, creating a balanced spectral absorption profile that reduces harmful light without compromising overall light quality.
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 interlayer film effectively reduces transmittance for light rays at 430 nm and achieves low excitation purity, improving the decorativeness and safety of laminated glass while maintaining heat shielding properties.
Implementation Method 1
each of the blue color-based coloring matter and the purple color-based coloring matter is a kind of coloring matter with a maximum absorption wavelength of 550 nm or more and 750 nm or less
Data Source
AI summary
There is provided an interlayer film for laminated glass enabling the laminated glass to have low transmittance for a light ray with a wavelength of 430 nm, and furthermore, being capable of achieving low excitation purity thereof. The interlayer film for laminated glass according to the present invention includes a thermoplastic resin, at least one first compound selected from yellow color-based coloring matter and red color-based coloring matter and at least one second compound selected from blue color-based coloring matter and purple color-based coloring matter, the ratio of the amount of the first compound to the amount of the second compound is 0.5 or more, and each of the blue color-based coloring matter and the purple color-based coloring matter is a kind of coloring matter with a maximum absorption wavelength of 550 nm or more and 750 nm or less.