Reflective material, traffic sign, reflective film
Since then, with the chemical industry, especially the development of synthetic resin, various research institutions continue to research and innovation, the use of glass bead technology, synthetic resin technology, thin film technology and coating technology, have developed a series of high quality products of retroreflective.Beginning in 1940s, the originally made reflective film, dubbed "engineering grade" reflective films, was widely used in road traffic signs. Since then, a series of products such as reflective coatings used in the fields of personal protection such as clothing and so on have also been developed with the advent of synthetic resins and the need for social development. Since then, accompanied by a series of achievements in materials science and technology and optical technology, especially the micro prism reflective material, reflective material which was mainly used in traffic signs, reflective material is gradually began to update, better place.
Reflective film is a kind of retroreflective material which has been made into film and can be used directly. It is also one of the most widely used retroreflective materials. In 1937, the world's first reflective film was born at 3M laboratories in the United states. This is the starting point for the application of traffic signs in reflective coatings. In 1939, the United States of Minnesota, the side of the road, the first time in the open under the conditions of the use of a TM reflective film made of Scotchlite signs, since then, opened a new era of a series of reflective products for traffic signs, to create a new traffic safety industry. This year, the United States of traffic signs in the national standard (1939 edition of the American "uniform traffic control facilities Handbook", Manual of United Traffic Control Devices, 1939) the official regulations, to make traffic signs using reflective film.
Glass bead type reflective film appeared earlier, but relatively few technological changes, there are two main types, a lens embedded type reflective film, traditionally known as the engineering grade reflective film; a sealed capsule, usually called high-strength reflecting film, out of the need of application, should concern is the embedded type lens, reflective film, due to its appearance has a long history, the various manufacturers, in the manufacture of a long process, using lens diameter, density, corrosion resistance coatings with different thickness, making many kinds of reflective film, such as super engineering grade reflective film, which is based on engineering grade reflective the film, with high quality glass beads, glass beads and the density increase, in order to improve the brightness of reflective film; commonly known as the economic level, mainly in the production of China, basically is based on engineering grade reflective film On the basis, by reducing the lens (glass beads) to achieve the quantity and density of the way, the two reflective film, reflective film and the reflection of economy, ability to meet the needs of traffic safety, and more is in the business field, there are few in the world will be included in the traffic safety into light standard.
There are many ways to classify reflective films. Among them, the generally accepted classification principle is based on the basic structure of the reflecting unit, and the sorting method based on the inverse reflectance coefficient of the positive reflectivity of the reflecting film. But considering the different process of reflective film, some are designed to address the non positive retroreflected luminance, some consideration of two aspects of performance, but also some bad weather conditions for the visual requirements, so this classification, there are also shortcomings. Therefore, it is very necessary to know and master the application condition and design function of various reflecting films.
