The development trend of EVA (ethylene-vinyl acetate) film for laminated glass in energy-efficient windows is leaning towards optimizing thermal performance, improving daylight inflow, minimizing energy consumption, and reducing greenhouse gas emissions. This is achieved through a combination of advanced technologies, material improvements, and design strategies.
The use of EVA interlayer films in laminated glass significantly improves the thermal performance of windows, contributing to energy-efficient buildings. The formulation of the EVA interlayer film, particularly the content of vinyl acetate and the melt flow index, strongly influences the performance of the laminated glass. This includes the melting behavior of the film during extrusion and lamination, as well as the optical properties of the final laminated glass. Recent studies have shown that using EVA interlayer films in laminated glasses can lead to substantial reductions in heat gain/loss and energy requirements compared to traditional monolithic clear glass. For instance, laminated glass with reflective solar control film glazing (LGRF) was found to have a cost saving of 100.84 $/year with a payback period of 1.7 years for cold climates. These laminated glasses also have the potential to reduce annual energy requirements without greatly affecting the daylight inflow link. The thermal properties and efficiency of windows can be further improved by using low-emissivity (low-E) coatings. Low-E coatings are thin, transparent coatings made from metal oxide (such as tin, silver, or zinc) that reduce the emissivity of glass surfaces. This results in a reduction in heat transfer between the inside and outside environments, improving the insulating property of the window academic.In addition to thermal performance, the crosslinking of EVA interlayer films also affects the mechanical properties of the laminated glass. Crosslinking yields a significantly stronger, stiffer film, which can enhance the properties of the laminated glasses. For example, laminated glass with highly crosslinked EVA interlayer films can withstand the pendulum impact test, indicating improved safety properties.
In summary, the development trend of EVA film for laminated glass in energy-efficient windows is centered around optimizing thermal and mechanical performance, reducing energy consumption, and improving safety and daylight inflow. These advancements are achieved through innovative material design, coating technologies, and the application of EVA interlayer films.