The basic structure of the earliest glass bead reflective film, which can be seen in the figure, the reflective vinyl sheet is generally composed of a surface layer (protective film), reflective layer (layer), base (bearing layer), the adhesive layer and the bottom layer (protection layer) and membrane structure layers of different material composition of objects. The reflective film surface is generally made of resin film is light transmittance and good weathering performance, reflecting layer according to the different types of reflective film materials are different, there are tiny glass beads, micro prism or metal reflective coating, thin film made of resin for basic organic compounds, epoxy resin adhesive layer is generally glue, bottom protective layer of thick paper do.
A variety of reflective film structure diagram, it can be seen that the different types of reflective film, its composition, material and structure are also different.
The primary role of reflective film is to improve the surface performance of traffic signs, so that it can adapt to the all-weather traffic needs, and improve the road safety conditions.
Due to the difference of the reflective properties of different kinds of reflective films, it is necessary to make the corresponding specifications according to the setting, function and purpose of the logo when it is applied to the production of traffic signs. The science of this kind of application specification is considered as an important part of traffic control and security technology by the safety engineering professionals all over the world.
Traffic control and safety technology has been developed for hundreds of years. From the first Department of traffic signs in the UK since the advent of standards in 1908, many countries in the world have continued to put a lot of scientific and technological resources, to analyze and grasp the retroreflective technology in the field of traffic safety and the role of value. In this regard, walking in the forefront, Europe and other developed countries, the results of their research, in many ways, help Chinese in just 10 years, through the study of reflective traffic signs -- China technology started late in 1980s, the process from scratch, with traffic signs and traffic signs with the national standard GB5768 countries the standard GB18833 reflective material as the main technical specification. In many respects, these standards are still in a stage of great improvement and development, and related scientific applications, methods and effects, research conclusions and so on, need a lot of time and practice.
