[China Glass Network] First, the application of glass curtain wall Sherpa Pet Blanket Wholesale,Pet Sherpa Blankets,Pet Blanket Wholesale,Polar Bear Fleece Blanket Shaoxing Fangzhuo Textile Co.,Ltd , https://www.printblanket.com
Glass curtain wall is increasingly used as a building exterior wall. The external wall is inevitably affected by wind load (wind pressure) and temperature. The wind intensity and frequency of each area are different due to heating conditions, so it determines the area of ​​glass. Different sizes, different models, and different colors of glass are selected depending on the height of the floor. The requirements for the use of glass for exterior walls are at least to withstand two stresses: one is the ability to withstand wind loads and the other is to withstand thermal stress. Careful calculation of the above stress should be carried out, and appropriate glass should be used to reduce self-explosion. The quality of the glass body is also very important for self-explosion. For example, compared with flat glass and float glass, the thickness uniformity and flatness of the flat glass are lower than the quality of the float glass. Therefore, the flat glass is also weak in wind load capacity and thermal stress capability. For example, if the glass is semi-tempered and tempered, its resistance to wind pressure and thermal stress is significantly improved. Semi-tempered glass or tempered glass, the surface of which has a compressive stress at the end, so the glass compressive strength is much higher than the tensile strength, so it can withstand bending, impact and temperature changes. If the wind load factor is used to correct the wind load capacity of different types of glass, the 6 mm monolithic float glass is 1, the 6 mm semi-tempered glass is 2.0, and the tempered glass is 4.0. The coated glass is coated with one or several layers of metal alloy or chemical film on the surface of the glass by physical or chemical methods. At present, different processes are produced at home and abroad: vacuum magnetron sputtering (also known as vacuum sputtering); Method (spray metal or other compound and glass in the production process of float glass, also known as in-line coated glass, can be hot-bent); vacuum evaporation, gel method (also known as electroless coating). Due to the different processes of the above four coated glasses, the performance and quality of the coated glass are also very different. The first two coated glass qualities are superior to the latter two types of glass and can be used for hidden frame glass curtain walls.
The building uses sunlight control glass, also known as heat reflective coated glass (referred to as coated glass). The main feature is that it allows enough sunlight to enter the room, and it can reflect the quantitative solar heat energy, and can transmit visible light of 0.3~2.5 microns. The 3~12 micron far infrared ray is reflected and keeps the indoor cool. The light transmittance of the glass is between 8 and 40%, and can be made into various colors such as gold, silver, blue, brown and green. There are many domestic manufacturers of such glass, and the quality varies greatly due to different practices, different equipment, and various other reasons.
Low-emissivity glass produced abroad, which is characterized by its ability to transmit 80% of solar radiation energy without affecting the light transmittance of visible light, and to maintain a large amount of ultraviolet light in the room. The effect of ultraviolet light in the sun on indoor furniture. There is no such low-emissivity glass produced in China.
Second, the glass blew phenomenon of brittle material is glass <br> <br> by multiple effects. In addition to the mass of the glass body, the geometry of the glass, such as square, rectangular, triangular and circular. The installation condition of the glass is as follows: whether the periphery is fastened or loosened, whether the support is placed on the bottom of the glass, the hardness of the glass and the surrounding aluminum alloy frame is sealed or sealed with glass glue, and the subsequent processes and heat conditions are closely related to the self-explosion of the glass. influences.
The thermal stress of the glass self-explosion is generally caused by unevenness of the glass body. After the glass is placed on the wall, under the direct sunlight, the glass absorbs the infrared light and part of the visible light, which is converted into heat energy in the glass body, which raises the temperature of the glass body and forms thermal expansion around the glass. If the glass is embedded in the interior of the aluminum alloy frame, the glass-inlaid portion cannot be exposed to the same exposure to the outside of the frame, thereby causing uneven heating of the entire exposed body, internal thermal stress is formed, and thermal expansion of the central portion of the glass causes tensile stress on the edge of the glass. The tensile stress is greater than the tensile strength of the glass, which causes cracking of the glass (self-explosion). Thermal stress cracking can generally be distinguished by the following characteristics:
1. The rupture edge of the glass is neatly ruptured, the number of cracks is small, and the rupture line is a meandering single or double line.
2. The glass rupture line is generally at right angles to the edge of the glass, otherwise it may be due to cracking of the bending stress or defects in the edge of the glass.
3. The rupture lines in the middle of the glass are mostly arc-shaped.