The application of light storage self-luminous signs in fire engineering(2)

Evacuation signs should be made of non-combustible materials, otherwise they should be outside with a protective cover made of glass or other non-combustible transparent materials. Cover. In other words, except for the signs made of aluminum alloy and other non-combustible materials as the base material In other words, except for the signs made of aluminum alloy and other non-combustible materials as the base material, other plastic materials as the base material of the light storage self-generating signs If no glass or other non-combustible transparent material is added to protect the sign, it cannot be used as an evacuation sign. Cover, it can not be used as an evacuation sign.

For indoor Non-evacuation signs used, the oxygen index of the production material shall not be less than 32. According to the test, the base material of the current light-storing self-luminous signs is mostly plastic material. Without strict flame retardant treatment, its oxygen index cannot reach the requirement of 32.

Plastic as the base material of the light storage self-luminous signs set in the wall, the upper part of the column, according to the fire smoke and smoke. When the upper column, according to the law of fire smoke flow, hot smoke to several meters per second The speed of several meters per second, the upper part of the building interior will form a layer of hot smoke. Due to the role of hot smoke will make it melt and lose its proper role.

With self-luminous materials made of signage and its auxiliary signage, its surface luminance of any light-emitting area should not be less than 051cd/m2. text auxiliary signage surface of the maximum luminance and minimum luminance ratio should not exceed 3:2, graphic signs of the maximum luminance and minimum luminance ratio should not exceed 5:2. According to the author's test, most of the luminous brightness of the surface of the self-luminous sign is not uniform and varies greatly. After 10 min of luminescence, the surface brightness is generally lower than 0 51 cd/m2. More than 0 51 cd/m2.

The emergency working time of the fire emergency lighting should not be less than 90min. 513 stipulates that: only with green or red graphics, text constitutes a sign of the minimum surface brightness of the sign light should not be less than 15cd/m2; with white and green combination or white and red combination constitutes a graphic, text as a sign of the sign light surface Although, the initial maximum surface brightness of some light storage self-luminous signs and the minimum brightness requirements of the fire emergency lights, but the initial brightness can only last for a few minutes, and the surface brightness of the fire emergency lights is required to work in emergency time at any moment of the surface brightness can not be lower than the minimum brightness. This can be considered that the luminous brightness of the light storage self-luminous sign is almost unable to meet the requirements as a fire emergency light.

light storage self-luminous signs must be daylight or fluorescent lamps and other light sources continuously irradiated for a certain period of time, while the irradiation of light illumination, color temperature, distance, projection angle, etc. have very high requirements, and many settings where the light source is difficult to ensure the illumination, color temperature, distance, projection angle requirements.

If the fire occurs at night without light, the light storage self-generated light marker Will have been several hours without light source irradiation, the daytime "suck" light has been released light for several hours Hours, coupled with the fire smoke scrimmage, its weak afterglow is difficult to play Induce, indicate the role of evacuation.