On April 2, 2012 Hong Kong Yi Jun Chuo hotel fire emergency events, to the LED industry knocked on the a wake-up call: in the rapid development of the industry at the same time, LED display safety technical field of the application of the remaining short board, Standardization of LED products and was again put on the agenda. In particular, LED display technology is the focus of fire safety applications, so today a small series of leading us to see what factors will affect the safety of the display screen fire.
Display fire prevention technology is mainly with the display of fire prevention materials, box technology has a great association.
Fire prevention materials mainly include the use of wire inside the display screen, power supply, external protection structure of fire protection materials and plastic package of these four aspects:
The first point: in most of the display applications, the larger the unit area of the display screen, the greater the power consumption, the power of the wire on the stability of the electrical power is also higher. Numerous wire products and used in accordance with the requirements of the national standard of wire to ensure the security and stability of, requires a three point: core wire for copper conductive carrier and core wire cross-sectional area of tolerance values in the standard range, wire wrapped core rubber insulation resistance and flame resistance up to standard, compared to in normal copper clad aluminum wire core, core wire cross-sectional area is too small, insulation rubber enough grades of wire, electric performance more stable, not prone to short circuit; dedecms.com
The second point: power supply products through the UL certification is the choice of similar products is the best choice, the effective conversion can guarantee security and stability of power supply load, in the external environment temperature hot case, also can normal work;
The third point: in outside the display screen door structure materials, market fire rating higher display products mostly adopts the fireproof aluminum-plastic plate, the fire resistance of the excellent, fire retardant is also very strong, the core material of special material for oxygen aging property is also very strong, 135 DEG C melting temperature and decomposition temperature is more than or equal to 300 DEG C, environmental performance, low smoke halogen free, in line with SGS, flame retardant B-S1, d0, T0, reference standard UL94, GB/8624-2006. General outdoor display products, aluminum plate with the aging temperature, rain, cold and hot shock faster, make its are in more humid climate seasons, rain easily penetrate the screen body internal cause fire caused by short circuit of electronic components;
The fourth point: display fireproof raw materials and an important part, that is plastic package, plastic package is mainly module mask at the bottom of the shell material, main raw material is a function of flame retardant PC + glass fiber materials, not only has flame retardant function, more in high and low temperature and long-term use, no deformation, will not change brittle cracking, and combining with the sealing glue can use, can effectively stop external environment of rain penetration into the inside and cause a short circuit fire.
In addition to the internal raw materials affect the fire effect, external configuration and design is also very important, but external configuration mainly related to fire safety problem in heat dissipation, in the work of the display screen and configuration row fan and air conditioning on the screen body internal cooling cooling, recommended every 8-10 square assembly 1p air conditioning to ensure the screen body temperature normal temperature, air-conditioning or fan configuration does not reach the designated position will cause heat treatment is not uniform, easily lead to screen body internal safety problems caused by temperature increased. Also many led enterprises in the box and the protection level of the test, just a simple simulation of the external environment in the spraying waterproof test, permanent waterproofing effect and strength to be verified, so the resulting in display products used for a period of time after a water seepage, it is outdoor display screen is prone to fire or use short life of the important reasons. In deal with thunderstorms, screen device arrester is to avoid lightning assault and necessary tools in burn out the screen body within the device can be directly to the lightning into the ground, and not on the screen body impact.
Above all belong to display the internal reason, of course, we also can not ignore the late maintenance process caused by man-made factors, such as in follow-up maintenance work and operation personnel not according to strict process flow of operation (module screws not tighten, wire polarity reverse, conductive objects left over after the operation), easily lead to a house on fire.
Similarly, in the lighting industry, fire caused the main reason is due to the installation position is not standardized or material used is appropriate to prevent fire lighting are the main measures to strictly control and the distance between the combustible, regulate the installation and good heat insulation protection.
The exact cause of the fire screen Hong Kong Hotel event remains to be investigated, but not because of this incident and the LED display product application in Hongkong hold a negative attitude, although the industry standard has not been established, but the industry better LED enterprises are many, such as Shenzhen City Kyrgyzstan WidePlus Electronics Co. Ltd. display products has won the test center of BS476 building materials fire tests, which reached the international certification standard LED display products is a leader in the industry, we should look to these enterprises leading model, to their own requirements with high quality, strict specifications, guide the healthy development of the industry, so as to enhance the industry's International competitiveness, to international.
