Reflective film is a retroreflective material that has been made into a thin film and can be directly applied, and it is also the most widely used retroreflective material. In 1937, the world's first reflective film was born in a laboratory in the United States. It is the starting point of the history of large-scale application of reflective film in traffic signs. In 1939, a sign board made of reflective film was used for the first time in the open air on the side of the road in Minnesota, USA. Since then, it has opened a new era of a series of reflective products used in traffic signs and created a new era. traffic safety industry. This year, the National Standard for Traffic Signs in the United States (1939 edition of the United States Manual of United Traffic Control Devices, Manual of United Traffic Control Devices, 1939) officially stipulated that reflective films should be used to manufacture traffic signs.
Since then, with the development of the chemical industry, especially synthetic resin, various R&D institutions have continued to research and innovate, using glass bead technology, synthetic resin technology, film technology and coating technology to develop a series of high-quality retroreflective products.
Beginning in the 1940s, this originally manufactured reflective film, dubbed "engineering-grade" reflective film, was widely used in road traffic signs. Since then, a series of products such as reflective films used in personal safety protection fields such as clothing have been developed one after another with the advent of synthetic resins and the needs of social development. Since then, along with a series of research results of material technology and optical technology, especially the emergence of microprism reflective materials, the reflective materials originally mainly used for traffic signs have been gradually replaced by newer and better reflective materials.