Car glass is like our umbrella, accounting for one third of the car's surface area. It can not only protect us from the wind and rain, avoid the damage of ultraviolet rays, but also provide us with a good line of sight and concentrate on driving. However, from the perspective of the whole car, the most vulnerable part of the whole car should be the window glass. When accidents happen, the car glass is the first to break. Therefore, the importance of automotive glass is gradually recognized by automobile manufacturers and users. Today, Xiaobian will talk about the changes of automobile glass.
I wonder if you know that the first car was not equipped with glass
Therefore, people found that the vehicle can only drive at a very low speed, because insects and other debris on the road will splash on your face, and drivers and passengers can only use goggles, which is very inconvenient.
However, with the development of automobile mechanical properties, the speed becomes faster and faster. After that, the sharp wind and flying debris hit the driver's face and become a very serious problem. So in the 1920s, carmakers added a windshield to their cars.
These original windscreens are manually cut from flat glass, but unfortunately, when the glass is broken, the flat glass will break into large dangerous sharp fragments, and then hurt the passengers, which is not in line with the original intention of installing windscreens for safety.
In the 1930s, Henry Ford, the founder of Ford, suffered minor injuries due to the fragmentation of a windshield, which prompted Ford to invent laminated safety glass. He sandwiched the two glasses together and separated them with a layer of plastic to make something similar to a sandwich. This idea is very consistent with the requirements of the windshield, because the plastic interlayer can prevent the broken glass from falling on the passengers like a sharp knife and hurting the passengers.
In the late 1950s, foreign countries began to use all tempered glass as the front windshield glass. However, it was later found that once the glass was broken, the fragments of all tempered glass could not ensure the driver's field of vision, and the small particle fragments caused serious damage to the eyes, so that the driver could not effectively take braking measures, resulting in the occurrence of secondary accidents.
In the 1960s, foreign countries stipulated that there should be a certain field of vision when the front windshield glass was broken, and all tempered glass should not be used as the windshield glass, which greatly reduced the personal casualties caused by the glass.
There are three main types of automotive glass today: laminated glass, tempered glass and regional tempered glass.
Glass products made of two or more layers of glass bonded with one or more layers of transparent bonding materials. Its characteristic is that the brittle glass is broken after impact, but due to its combination with elastic PVB, the laminated glass has high penetration resistance and can still maintain visibility. In general, it has high safety and temperature and light resistance.
Tempered glass belongs to safety glass. In fact, it is a kind of prestressed glass. In order to improve the strength of the glass, chemical or physical methods are usually used to form compressive stress on the glass surface. When the glass bears external forces, it first offsets the surface stress, so as to improve the bearing capacity and enhance the wind pressure resistance, summer and cold resistance and impact resistance of the glass.
Zone tempered glass
Area toughened glass is a new type of toughened glass. After special treatment and punishment, the crack of the glass can still maintain a certain clarity when it is cracked, ensuring that the driver's field of vision will not be affected. At present, the automobile front windshield is mainly composed of laminated toughened glass and laminated area toughened glass, which can withstand strong impact.
Post time: 21-10-21