PVB adhesive film can be widely used in laminated glass of buildings, laminated glass of cars, solar photovoltaic glass, bulletproof glass, soundproof glass, etc. It has good safety and can prevent the glass from being broken due to external force, and the broken pieces will splash and hurt people. In addition, it has sound insulation and UV protection, can be made into color or highly transparent, and has optical application value, such as the application of solar photovoltaic. PVB adhesive film has been applied to building curtain wall glass for 70 years. In the automotive and construction industry regulations, PVB adhesive film is required for safety protection. In recent years, with the improvement of people's requirements for energy conservation and environmental protection, the solar photovoltaic market is changing with each passing day, and the demand for photovoltaic grade PVB films is becoming more and more obvious.