Reflective film is a kind of reverse reflection material which has been made into thin film for direct application.In 1937, the world's first reflective film was born in a laboratory in the United States.It is the starting point of traffic sign's large-scale application of reflective film history.In 1939, a sign made of reflective film was first used in the open air along the road in Minnesota, USA. Since then, a series of reflective products have been used in traffic signs, opening a new era of traffic safety industry.This year, the national standard for Traffic signs in the United states (1939), Manual of United Traffic Control Devices (1939), formally stipulated the use of reflective film to make Traffic signs.
Since then, with the development of the chemical industry, especially the synthetic resin, various research and development institutions have constantly studied and innovated, using glass bead technology, synthetic resin technology, film technology and coating technology, and developed a series of high-quality reverse reflection products.
Starting in the 1940s, the original reflective film, dubbed the "engineering" reflective film, was widely used in road traffic signs.Since then, a series of products, such as reflective film for personal safety protection such as clothing, have been developed successively with the advent of synthetic resin and the need of social development.Since then, along with a series of research results of material technology and optical technology, especially the appearance of the micro-prism reflective material, the reflective material originally mainly used for traffic signs began to be gradually replaced by newer and better reflective material.
There are many ways to classify reflective film.The generally accepted classification principle is based on the basic structure of the reverse reflection unit, and the ranking method is mainly based on the reverse reflection coefficient of the front photometric property of the reflective film.However, considering the different processes of reflective film, some are specially designed to solve the brightness of non-positive reverse reflection, some are for the consideration of both properties, and some are for the visual recognition requirements under severe weather conditions, so this classification method also has some shortcomings.Therefore, it is necessary to be familiar with the application conditions and design functions of different reflective films.
In the traditional custom, reflective film is divided into two categories according to the structure of reflective film unit, glass bead reflective film and micro prism reflective film.Each type of reflective film also contains many kinds, such as the microprism reflective film. Due to the more advanced technology, its material selection and prism structure have been changed a lot, which can meet more traffic demands.According to the form and technical features of the prism, micro prismatic reflective film can be divided into the remote back reflection ability good cutting Angle prism reflective film, close large Angle back reflection performance good cutting Angle prism reflective membrane, and various aspects demand the prism of reflective film, give attention to two or morethings performance day and bad weather conditions are good type fluorescent prism reflective film, all in line with the traditional engineering level of back reflection parameters of prismatic reflective film and so on.Glass bead reflective film appeared earlier, but its technological change is less, there are mainly two types, one is the lens embedded reflective film, commonly known as engineering reflective film.One is a sealed capsule type, usually called high - strength reflective film.In lens embedded type reflective film, due to its appearance has a long history, various manufacturers, in the long manufacturing process, using the lens diameter, density, corrosion resistance of the coating thickness is different, made a lot of kinds of reflective film, such as super engineering grade reflective film, mainly on the basis of engineering grade reflective film, with higher quality of glass bead, and increase the density of the glass bead, to improve some brightness;Commonly known as the economic level of reflective film, mainly produced in China, is basically on the basis of engineering grade reflective film technology, by reducing the number of lens (glass beads) and the way of density, the two kinds of reflective film, economic grade reflective film, its reflection ability can't satisfy the need of traffic safety, more is to use in the business world, there are very few in the world in its list of traffic safety to the standard of light.
According to the types of reflective film, reflective film can be divided into heat sensitive reflective film, pressure sensitive reflective film and reflective film without gum.The traditional reflective film applied in the field of traffic facilities is mainly pressure sensitive adhesive.Pressure sensitive adhesive can adhere to smooth and clean surface without heating, solvent or other preparation work. Traffic signs are usually pasted on aluminum or aluminum alloy plates.The viscosity of the thermoplastic is stimulated by heating the material and applying pressure.The reflector film without back glue is usually made of materials with support such as traffic cone reflector, temporary rolling warning sign and equipment column reflector.
Talking about the scientific classification of reflective films, we can not leave the reflective film standards that have great guiding significance for the application of reflective films.Reflective film in the standard in the countries all over the world, China's reflective film, the American society of material and test standard, Australia and New Zealand standard, the federal highway administration, traffic signs back reflection material guidance, etc., countries around the world the research and application of back reflection materials traffic signs, to improve traffic safety, has played a positive role in guiding.Next, we will introduce one by one.
Chinese reflective film standard is GB/T 18833-2012, road traffic reflective film.According to its photometric structure and use, the reflective film is divided into 7 types.
Class I, usually lens embedded glass bead type structure, called engineering grade reflective film, the service life is generally 7 years, can be used for permanent traffic signs and operating area facilities.
Class II, which is usually a lens embedded glass bead structure, is called super engineering reflective film. Its service life is generally 10 years.
Class III, the usual sealed capsule type glass bead structure, called high strength reflective film, the service life is generally 10 years, can be used for permanent traffic signs and operating area facilities.
Class IV, usually microprism structure, is called super - class reflective film, the service life is generally 10 years, can be used for permanent traffic signs, operating area facilities and contour marking.
Class V, usually microprism structure, is called large Angle reflective film, and its service life is generally 10 years. It can be used for permanent traffic signs, operating area facilities and contour marks.
Class VI, usually microprism structure, with metal coating, with a service life of 3 years, can be used for contour mark and traffic column, and can also be used for working area facilities and less character traffic signs when no metal coating.
Category VII, usually microprism structure, flexible material, service life is generally 3 years, can be used for temporary traffic signs and operating area facilities.
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