Since the appearance of cars, glass has been inseparable. The original car glass only played a role in resisting wind and cold, rain and dust. With the development of the automobile industry, road conditions continue to improve, and vehicle speeds are increasing. The importance of automobile glass is gradually recognized. Automobile glass not only provides occupants with a good view when driving a car but also not in the event of sudden accidents. Injury to the driver and the occupants is also required to be lightweight and multi-functional.
Automotive glass requires good optical performance to ensure good visibility for the driver. It has experienced a transition from flat to curved, normal to reinforced, full tempered to partial tempered, tempered glass to laminated glass, and three-layered glass. The development process of the interlayer to the multi-layer interlayer and functional glass.
Automobile glass used to be mainly windshields. The glass is installed at the front end of the carriage to save the driver from the wind and rain. Up to now, the windshields of modern cars are generally curved, with a certain degree of curvature up, down, left, and right. The curved surface design can reduce air resistance from the perspective of aerodynamics, and the smooth transition between the edge of the window frame and the surface of the car body also increases the overall coordination and aesthetics visually. In addition, curved glass has higher strength, and thinner glass can be used to reduce the weight of the car body. The current automotive glass mainly includes laminated glass, tempered glass, and regional tempered glass. Among them, laminated glass has the highest safety, so its application is more common.
Tempered glass is the quenching of ordinary glass to form certain internal stress in the internal structure, thereby strengthening the strength of the glass. When it is impacted and broken, the glass will split into small pieces with blunt edges, which is not easy to cause damage to the occupants. Regional tempered glass is a new type of tempered glass. It has been specially processed to be able to maintain a certain degree of clarity in the cracks of the glass when it is broken by the impact. Ordinary toughened glass is not suitable for use as a front windshield, because when it is broken, it will turn into a pile of debris, which falls like a waterfall, blocking the driver’s view, which is not conducive to emergency handling. In this way, some mid-and low-end cars use regional tempered glass. When the glass breaks, the glass in the driver's field of vision will form fragments similar to the lens size, ensuring that the driver's field of vision is not affected, and the safety is high.
The so-called laminated glass is to use a transparent adhesive plastic film to stick between the two or three layers of glass, which combines the strength and toughness of the plastic with the rigidity of the glass to increase the resistance of the glass to breakage. When the glass is broken, the glass shards will stick together, so that the glass shards will not be scattered and hurt people, and ensure that the driver has a certain field of view to deal with the emergency. In addition, the flexibility and penetration resistance of laminated glass after adding PVB film is enhanced, which can prevent the driver from rushing his head out of the car window due to excessive inertia during emergency braking. In order to minimize the harm of glass to people during accidents, the current front windshields of automobiles are mainly laminated tempered glass and laminated area tempered glass, which can withstand strong impact. Moreover, a kind of explosion-proof film is popular in the market. A special film is attached to the car glass, which not only strengthens the explosion-proof performance of the glass but also has the effect of UV protection and heat insulation.
However, if different substances are added to the laminated glass, more special functions can be added to the laminated glass. Bulletproof glass is a very strong and transparent chemical film sandwiched between laminated glass. This not only can effectively prevent bullets from shooting but also has the performance of anti-surge impact, anti-explosion, anti-vibration, and no cracks after impact. It is also possible to sandwich a thin constant wire in the glass inter layer to replace the whip antenna, which can avoid the trouble of pulling the antenna rod in and out without causing corrosion, generally on the front windshield glass. Or a layer of colored film is interlayered above the front windshield glass, from deep to shallow, which plays a role of shading to a certain extent. If a nylon heating wire reflective film is sandwiched between the two laminated glasses, it can play the role of heat insulation. It can let the visible light of the sun penetrate, and most of the near-infrared spectrum heating wire can be reflected back, thereby reducing the temperature in the car.
With the continuous integration of high and new technology into the production of automotive glass and the continuous improvement of automotive glass performance, car owners’ requirements for the defrosting, water resistance, concealment, and antifouling properties of automotive glass continue to increase, forcing the manufacture of automotive glass Constantly adding new features.
Post time: 16-11-21