Laminated glass is a two-piece or several pieces of float glass intermediate folder to tough PVB (ethylene polymer butyrate) film, as far as possible by pressing machines combined discharge pressure of air in the middle, and then into the use of high-pressure steam autoclave High pressure air will be dissolved in a small amount of residual film formed. The convenience of customers and higher designer requirements, can provide a variety of PVB film for customer choice (transparent, white, outlets and customer specified color).