Laminated Glass Infrared Reflective Interlayer
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Functional films in laminated glazings, such as SPD and PDLC films, deteriorate due to sensitivity to high temperatures during the lamination process and prolonged exposure, leading to a deterioration in their optical performance and switching function.
Innovation Solution
A laminated glazing design incorporating a thermoplastic interlayer with an opaque zone to visible wavelength radiation is used, positioned between the glass sheets to prevent infrared radiation absorption and protect the functional film from heat, while still concealing elements like busbars and connections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional thermoplastic interlayers are used in laminated glazings, then the lamination process can be completed, but the functional film deteriorates due to high temperature exposure
Solution Approach 1:
A reflective layer is introduced as an intermediary element between the external environment and the functional film. This reflective layer intercepts infrared radiation before it reaches the functional film, thereby mediating the thermal exposure and preventing temperature-related deterioration while maintaining the functional film's performance
Solution Approach 2:
The invention converts the harmful infrared radiation into a beneficial effect by using the reflective layer to redirect it away from the functional film. The same radiation that would cause deterioration is now utilized to illuminate the interior space without heating the sensitive functional film, transforming a harmful factor into a useful one
2Reliability
If opaque zones are added to protect functional films from heat, then thermal protection is improved, but the aesthetic appearance and light transmission are reduced
Solution Approach 1:
The reflective layer is positioned specifically at the edges of the glazing where it provides maximum thermal protection to the functional film edges, while the central area maintains full transparency. This local application of the reflective property protects the film without compromising overall light transmission and aesthetic appearance
Solution Approach 2:
The reflective layer is applied primarily at the peripheral edges rather than covering the entire surface. This dimensional approach concentrates the protective function at the boundaries where thermal exposure is most critical, while preserving the optical properties of the central viewing area
Data Source
AI summary
A laminated glass includes a first glass sheet, an electrically powered functional film, a reflective element to reflect infrared radiation, disposed between the first glass sheet and the functional film, at least one first thermoplastic interlayer disposed between the reflecting element and the functional film, and a second glass sheet. The laminated glass includes at least one interlayer including a zone that is opaque to radiation in the visible wavelength.