The Application of roller coating and spraying coating aluminum sheet in the Curtain Wall
The aluminum sheet used for curtain wall is made of pure aluminum (1100,1060), Al-Mn alloy (such as 3003) and Al-Mg alloy (5052,5754, etc.). The thickness of the spray and the alloy type can be selected according to the design requirements, without process restrictions. Due to the characteristics of the roller coating process, the thickness of the roller coating aluminum sheet is not more than 2.5mm.
In the curtain wall structure, the rigidity of the coating aluminum sheet is very important because the failure of the aluminum sheet in the curtain wall structure is not broken, but whether the aluminum sheet has sufficient rigidity to resist the deformation caused by the external load. In the case of the grid determination, Rigidity depends on the thickness of the aluminum sheet and the structure of the ribs.
The stiffness coefficient (D) is calculated on the basis of: D = Et3 / 12 (1-0.332), t is the sheet thickness, E is the elastic modulus.
A1-Mn alloy (3003) E1 = 70GPAA1-Mg alloy (5754) E2 = El = 69.3GPA, calculate the rigidity of 3mm thick 3003 aluminum alloy and 2.5mm thick 5754 aluminum plate: D3003 / D5754 = 1.753mm3003 Aluminum alloy rigidity For the 2.5mm 5754 aluminum alloy 1.75 times. From the elastic modulus E value can be seen, equal thickness of 3003 aluminum alloy than 5754 aluminum alloy slightly better. So many projects, especially high-rise structure and high wind pressure area use the 3mm thick spray coating aluminum sheet(3003).