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Reflective film classification and technical standards

Z.A Industry and Trade Co.,Ltd | Updated: Jan 11, 2017

Reflective film classification methods are many. Based on the basic structure of the retroreflective element, the sorting method based on the retroreflective coefficient of the positive photometric performance of the retroreflective film is mainly based on the generally accepted classification principle. But taking into account the different processes of reflective film, some are designed to address the non-frontal retroreflective brightness, and some both the performance of both, and some for the adverse climate conditions, the demand for visual recognition, so this classification method, but also There are shortcomings. Therefore, familiar with and master the application of a variety of reflective film conditions and design features, it is very necessary.

In the traditional habit, according to the structure of the reflective film reflective unit, the reflective film is divided into two categories, glass beads reflective film type and micro prism type reflective film. Each type of retroreflective film also includes many types, such as micro prism type reflective film, due to the use of more advanced technology, the choice of materials and prism structure, there are many changes that can cope with more traffic needs. According to the prism of the form and technical characteristics, micro-prism-type reflective film can be divided into long-range retrograde reflective good prismatic prism retroreflective film, close-angle large angle retroreflective performance of the truncated prism reflective film, and take into account Side prism reflective film, day and bad weather conditions are good fluorescence type full prism reflective film, in line with the traditional engineering-grade retroreflective parameters of the prism-type reflective film and so on. Glass beads reflective film appeared earlier, but the process changes are relatively small, there are two types, one for the lens embedded reflective film, used to be called engineering-grade reflective film; a sealed capsule type, commonly known as For the high-level reflective film. In the lens embedded reflective film, because of its long history, various manufacturers, in the long production process, the use of the lens diameter, density, weathering coating thickness of the different production of a variety of reflective film, Such as super-engineering-level reflective film, mainly in the engineering grade reflective film, based on the use of higher quality glass beads, and the density of glass beads increased to increase the brightness; commonly known as the economic level of reflective film, mainly in China Production, basically in the engineering-level reflective film technology, by reducing the number of lenses (glass beads) and the density of the way to achieve the two reflective film, the economy level reflective film, the reflection capacity can not meet the needs of traffic safety , More is used in the commercial field, few in the international community to be included in the road safety standards into the light.

Reflective film in accordance with the type of adhesive, reflective film can be divided into heat-sensitive adhesive reflective film, pressure-sensitive adhesive reflective film and no adhesive reflective film. Conventional in the field of transport facilities in the reflective film to pressure-based adhesive. Pressure sensitive adhesive, without heating, solvent or other preparation can be adhered to the smooth, clean surface, traffic signs are generally pasted in aluminum or aluminum alloy plate surface. The tackiness of the heat-sensitive adhesive is only stimulated when the material is heated and pressure is applied. No adhesive reflective film, usually used for traffic cone reflective tape, temporary roll warning signs and facilities, such as self-supporting columns with reflective material made of support.

Reflective film on the scientific classification methods, can not leave the application of reflective film has a great guiding significance of reflective film standard. Reflective film standards in the world, China's reflective film standards, the United States Association for Testing and Materials standards, Australia and New Zealand standards, the US Federal Highway Traffic signs anti-reflective materials guidance, the world's research and application of anti-reflection Materials, traffic signs, improve traffic safety, has played an active guiding role. Here, we are introduced one by one.

China's reflective film standard is GB / T 18833-2012, "road traffic reflective film." Reflective film in accordance with its photometric structure and use, divided into 7 types.

Class I, usually a lens-embedded glass bead structure, is a project-grade retroreflective film that has a typical service life of 7 years and can be used for permanent traffic signs and work area facilities.

Class II, usually a lens-embedded glass bead-type structure, said super-engineering grade reflective film, the service life is generally 10 years, can be used for yo durability traffic signs deterioration area facilities.

Class III, usually sealed capsule glass bead structure, said high-strength grade reflective film, the service life is generally 10 years, can be used for permanent traffic signs and operating area facilities.

Class IV, usually micro prism structure, said the super-level reflective film, the service life is generally 10 years, can be used for permanent traffic signs, work area facilities and outline standard.

V class, usually micro prism is enough, called the large angle reflective film, the service life is generally 10 years, can be used for permanent traffic signs, operating area facilities and contour standard.

VI class, usually micro-cooling structure, a metal coating, the service life is generally 3 years, can be used for outline standard and traffic column, no metal coating can also be used for work area facilities and fewer signs of traffic.

Class VII, usually micro prismatic, flexible material, the service life is generally 3 years, can be used for temporary traffic signs and operating area facilities.

American Society for Testing and Materials is a long history of international testing standards for materials, the English name for the Association of Standard Testing of Materials, referred to as ASTM, its establishment, is to the scientific community and industry to provide a range of material testing standards , In order to achieve the definition of new materials for the world of science, to provide a common platform for the exchange of technology. For the retro-reflective materials, as well as oil, natural gas, chemical and other industries in a lot of materials, to provide standardized technical support testing.

In view of this technical traceability, ASTM standards for the detection of retroreflective materials, but also with the retroreflective materials invented and used, the cumulative, each time a new material, as long as the material appears for some time and by its Manufacturers to apply to join the ASTM, its committee will authorize the classification of such materials, the establishment of testing standards. It is for this reason, in the ASTM4956 standard reflective film, reflective film types up to 11, but also continues; however, on the other hand, ASTM standard is more like a product on the retroreflective material catalog, and Is not a standard that can help to understand the methods and problems of retroreflective film applications, since the initial classification of these materials by ASTM does not take into account the driver's performance and needs.

For this reason, the developed countries in the world, in order to their own traffic engineering construction units to provide more effective technical support and guidance, have set up their own national technical standards, rather than directly follow the ASTM classification of reflective materials.

The following two classification methods are proposed by the US Federal Highway Administration on the basis of ASTM. The proposed classification method for retroreflective materials used by the traffic engineering implementing units is to combine glass beads and prismatic retroreflectors The structural characteristics of the material clearly distinguish between traffic signs and non-traffic signs for retroreflective material applications.

1, the US Federal Highway Administration, retroreflective material classification methods - September 2005 (traffic signs with reflective film)

2, the United States Federal Highway Management Department of retroreflective materials classification method - September 2005 (traffic cone, traffic column with reflective film)

Compared to the guidance provided by the Federal Highway Administration in the United States, the Australian and New Zealand Road Traffic Signs Retroreflective Material Standards are more concise and clearer. At present, many countries, including China, the standards, especially in many European countries, have been affected by this standard to varying degrees.

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