Broken bridge of aluminum window design actually refers to the thermal insulation strip in broken bridge aluminum materials. At present, there are two kinds of thermal insulation strips in the market. One is polyurethane glue injection, which is a pouring type, and most of them are non cavity structure. The other is PA66 nylon thermal insulation strip, which is a strip extrusion type with cavity structure. At present, the latter is mainly popular in China's market.