Quality and impact of automotive safety glass
[China Glass Network] With the socialization of Chinese vehicles and the massive development of private cars, the safety and security of automotive glass has received more and more attention from the whole society. As one of the important components of the car safety system, car window glass is more than just a wind and rain protection tool. It is always related to the safety of drivers and passengers. At present, automotive safety glass is mainly used for tempered glass for front windshield laminated glass and windshield. Laminated glass is a composite glass that is sandwiched between transparent glass and glass by transparent and elastic PVB film. Due to the strong toughness of the PVB interlayer film to the glass, it resists the penetration of accidental impacts when driving at high speeds. When the glass is broken by the impact force, the fragments are bonded by the strong PVB interlayer film, which prevents the fragments from scattering and falling off, and the whole glass remains intact, thus avoiding personal injury caused by the scattering or falling off of the fragments. Tempered glass is a safety glass product processed by a single layer of glass through heating, cooling and other processes. The mechanical strength is improved compared with ordinary glass, and after the glass is broken, the fragments are uniformly small particles and will not cause damage to passengers. The inconsistency of the automotive safety glass optical indicators has the following consequences:
1. Inappropriate visible light transmittance project will affect the driver's ability to blur when driving in daylight and daylight in the light.
Intuitively, the visible light transmittance is the clarity of the glass, and the low definition causes the vision to be blurred. When the vehicle is traveling at high speed, the frontal things are not seen, which causes visual fatigue and affects driving safety. Appropriate transmittance can ensure that the driver has a suitable driving environment in various weather conditions and driving at night. Therefore, the exterior viewing of the car safety glass should be clear and transparent, and it does not irritate the eyes.
2, the secondary image deviation
Sub-image deviation (item) means that when the two surfaces of the glass are not parallel, when viewing the object through the glass under certain lighting conditions, in addition to seeing the main image (target in the line of sight observation), one or A plurality of sub-images (commonly known as shadows), the angle formed between the sub-image and the main image is called the sub-image deviation angle. In the dark back, the secondary image caused by the bright lights is very obvious when driving at night. If the secondary image deviates too much, the driver will have an illusion and is prone to traffic accidents. The car safety glass has found that the above phenomenon has attracted enough attention and can be further tested by professional testing organizations to avoid accidents.
3, optical distortion production project
The light distortion generating item refers to the unevenness of the surface of the glass or the local optical unevenness, which causes the passing light to deviate, thereby deforming the object. If the light changes greatly, it will easily cause fatigue to the driver's eyes, resulting in traffic accidents. According to the normal glass, some roads, people, or other objects outside the car should be seen through the glass. There should be no deformation. If there is deformation, we call it optical distortion. If it deforms more than certain conditions. At the time, this kind of deformation has a great impact on people's visual effects. Human vision will affect the whole brain cell thinking. Then these direct responses to people are easy to make trouble, that is, it is easy to cause a blurred vision, so that driving is Very very unsafe. The front windshield of the car not only provides a good view to the passengers in the car, but also provides protection for the driver and passengers in the event of a sudden accident. It needs to form a certain arc according to the body line design to ensure that the glass and the body fit perfectly. This kind of curvature requires professional manufacturers to heat and bend the glass to complete the processing under the precise mold size and strict temperature control. At present, in China, the car safety glass assembled from the new car is generally not subject to optical distortion. However, when the front windshield of the automobile needs to be replaced due to the crushing, the replaced glass tends to have a good quality. In addition to the possibility of optical distortion, some unqualified glass may have a greater safety hazard. The surface of the car safety glass is seen from the side, and there is no obvious unevenness or partial optical unevenness (commonly known as horizontal ripple).
4, color recognition project
Driving safety is not only affected by factors such as its operational safety sight, but also by color recognition. Psychologists believe that the visibility of good color is good, the brightness of the color, the brightness in people's vision is different, can be divided into bright and dark. Red and yellow are bright colors, and the visibility is good. Dark colors look smaller, farther and more blurred. Color recognition is related to the safety of driving and has an impact on the driver's visibility. Under normal circumstances, the choice is easier to be recognized by the human eye, can maintain a certain degree of transparency, does not affect the line of sight, that is, driving safety.
The basic requirement of modern automobile for glass is that glass must have sufficient safety. This safety is reflected in the following three aspects: (1) sufficient mechanical strength. Modern vehicles must drive at high speed on various rugged roads. The sand and gravel on the road will hit the glass during driving. The car's head and body may hit the glass when the car bumps and vibrates, so the glass is required to have sufficient mechanical strength. (2) Excellent optical performance, modern car requirements The glass has excellent optical properties including transmittance of 70% or more; light distortion is small, that is, the object observed through the glass must not be significantly deformed; the off-angle of the secondary image is small, that is, an object observed through the glass is not mistaken for two. Of course, it is even more difficult to confuse the color of road traffic signs; (3) Good environmental stability. Modern vehicles must be driven under various harsh weather conditions, such as high temperature, exposure, high humidity, etc., and the appearance quality of glass under these conditions is required. Variety.
The safety guarantee function of the automobile windshield installation system We know that the automobile glass is different from ordinary commodities, its damage is extremely special and accidental, and once the automobile glass is damaged, it needs to be replaced or repaired immediately, not only to prevent it. Leakage, water leakage, etc., are for the safety of drivers and passengers. Car windshield is one of the important components of car safety components, and seat belts and airbags are called three elements of car safety protection.
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