color coated aluminum coil

Характеристики цвета алюминиевого шпона, процесс ПВДФ

Характеристики цвета алюминиевого шпона, процесс ПВДФ

Aluminum veneer is widely used in building curtain walls, and its surface PVDF fluorocarbon coating is usually formed by spraying process, and also formed by roller coating process. The fluorocarbon sprayed aluminum veneer is to process the light aluminum plate into a structure with reinforcing ribs and hanging ears through the sheet metal processing technology, and then apply PVDF fluorocarbon coating. The roll-coated coil is firstly coated with PVDF fluorocarbon coating on the surface of the aluminum plate through the roll coating process, and then the coated plate is processed into a certain structure through the sheet metal processing process. This paper compares and analyzes the differences in the application and performance of spray-coated panels and roller-coated panels in curtain walls.

The materials of aluminum veneer for curtain wall include pure aluminum series (1100, 1060), A1-Mn alloy (такие как 3003) and A1-Mg alloy (5052, 5754, и т.п.). The thickness and alloy type of the sprayed plate can be selected according to the design needs, not limited by the process. Due to the characteristics of the roller coating process. The thickness of the roller coating plate is not more than 2.5mm. The rigidity of the commonly used 3mm thick 3003 sprayed plate and 2.5mm thick 5754 roller coated plate is compared and analyzed below.

In the curtain wall structure, the rigidity of the aluminum plate is very important, because the failure form of the aluminum plate in the curtain wall structure is not fracture. It is whether the aluminum plate has enough rigidity to resist the deformation caused by the external load. When the division is determined, the rigidity of the aluminum plate depends on the thickness of the aluminum plate and the structure of the rib. The rigidity of the aluminum veneer is stipulated in JG 102-2003 “Technical Specifications for Glass Curtain Wall Engineering”. Stiffness coefficient (D) calculation basis:

D=Et3/12 (1—0.332), t is the plate thickness, E is the modulus of elasticity.

A1-Mn alloy (3003) E1=70GPA
A1-Mg alloy (5754) E2=E1=69.3GPA
Calculate the rigidity of 3mm thick 3003 aluminum alloy and 2.5mm thick 5754 алюминиевая пластина:
D3003/D5754=1.75

The rigidity of 3mm3003 aluminum alloy is 1.75 times that of 2.5mm5754 aluminum alloy. It can be known from the value of elastic modulus E. The 3003 aluminum alloy of equal thickness is slightly more rigid than the 5754 алюминиевый сплав.

Следовательно, many projects, especially high-rise structures and high wind pressure areas, use 3mm thick sprayed aluminum plates (3003), such as Shanghai Central Plaza (170m high), Dalian Yunshan Building (210m high), Shenzhen Airport, так далее. In foreign countries, pure aluminum plates are often used, with a thickness of 3mm to 4mm. Roller coated panels are suitable for use in low wind pressure conditions, such as low-rise buildings.

The standard commonly used at home and abroad to measure the performance of fluorocarbon coatings on the surface of aluminum veneers is the American Construction Manufacturers Association AAMA 605.2 Спецификация. This standard is formulated for the spraying process. For the fluorocarbon coating formed by the roller coating process, there is no general technical specification at home and abroad, because this kind of plate is rarely used. my country’s industry standardTechnical Specifications for Fluorocarbon Coating on the Surface of Architectural Aluminum Sheets and Aluminum Profilesequivalently adopts the AAMA605.2 specification, which is also formulated for the spraying process.

Compared with spray-coated panels, the coating thickness of roller-coated panels is thinner. The roller coating production line is generally two coatings and two baking or one coating and one baking. According to the characteristics of the roller coating process, the coating thickness of the roller coating plate is less than 25um. A thin coating will reduce its resistance to UV penetration and weathering resistance. In order to achieve a thickness of 40um, the roll-coated sheet has to be coated and baked multiple times (such as four-coated and four-baked), allowing the aluminum coil to pass through the roll-coating line twice. In this way, the molecular binding force between the layers is lower than that of the intra-layer molecular binding force, and the external small molecules are easy to diffuse along the layer and corrode the coating and the substrate.

Single-layer aluminum panels are widely used in building curtain walls. The PVDF fluorocarbon coating on the surface is usually formed by spraying or roller coating. The former is to process the light aluminum plate into a structure with ribs and hanging ears through the sheet metal processing process, and then apply PVDF fluorocarbon coating. The roll-coated plate is firstly coated with PVDF fluorocarbon coating on the surface of the aluminum plate through the roll coating process, and then the coated plate is processed into a certain structure through the sheet metal processing process. This paper compares and analyzes the differences in the application and performance of spray-coated panels and roller-coated panels in curtain walls.
The materials of single-layer aluminum panels for curtain walls include pure aluminum series (1100, 1060), Al-Mn alloys (такие как 3003) and Al-Mg alloys (5052, 5754, и т.п.). The thickness and alloy type of the sprayed plate can be selected according to the design needs, not limited by the process. Due to the characteristics of the roller coating process, the thickness of the roller coating plate is not more than 2.5mm. The following is a comparative analysis of the rigidity of the commonly used 3mm thick 3003 spraying plate and the 2.5mm thick 5754 roller coating plate.
In the curtain wall structure, the rigidity of the aluminum plate is very important, because the failure form of the aluminum plate in the curtain wall structure is not fracture, but whether the aluminum plate has enough rigidity to resist the deformation caused by the external load. Rigidity depends on the thickness of the aluminum plate and the structure of the ribs. The rigidity of the single-layer aluminum plate is stipulated in JGl02-2003Technical Specifications for Glass Curtain Wall Engineering”.
Stiffness coefficient (D) calculation basis:
D=Et3/12(1-0.332), t is the plate thickness, E is the modulus of elasticity.
A1-Mn series alloy (3003) E1=70GPAA1-Mg series alloy (5754) E2=El=69.3GPA Calculate the rigidity of 3mm thick 3003 aluminum alloy and 2.5mm thick 5754 алюминиевая пластина: D3003/D5754=1.753mm The rigidity of 3003 aluminum alloy is 1.75 times of 2.5mm5754 aluminum alloy. From the elastic modulus E value, it can be seen that the rigidity of 3003 aluminum alloy with equal thickness is slightly better than that of 5754 алюминиевый сплав.

Следовательно, many projects, especially high-rise structures and high wind pressure areas, use 3mm thick sprayed aluminum panels (3003), such as Shanghai Central Plaza (170m high), Dalian Yunshan Building (210m high), Shenzhen Airport, так далее. In foreign countries, pure aluminum plates are mostly used, with a thickness of 3mm to 4mm. Roller-coated plates are suitable for use in low wind pressure conditions, such as low-rise buildings.

The standard commonly used at home and abroad to measure the performance of fluorocarbon coatings on the surface of single-layer aluminum panels is the American Architectural Manufacturers Association AAMA605.2 specification. This standard is formulated for the spraying process. For the fluorocarbon coating formed by the roller coating process, there is no general technical specification at home and abroad, because this kind of plate is rarely used. my country’s industry standardTechnical Specifications for Fluorocarbon Coating on the Surface of Architectural Aluminum Sheets and Aluminum Profilesequivalently adopts the AAMA605.2 specification, which is also formulated for the spraying process.

Compared with the spray-coated plate, the coating thickness of the roller-coated plate is thinner. The roller coating production line generally has two coatings and two baking or one coating and one baking. According to the characteristics of the roller coating process, the coating thickness of the roller coating plate is less than 251xm. A thin coating will reduce its UV penetration resistance and wind erosion resistance. In order to achieve a thickness of 401xm, the roll-coated sheet has to be coated and baked multiple times (such as four-coated and four-baked), so that the aluminum coil passes through the roll-coating line twice. In this way, the molecular binding force between the layers is lower than that of the intra-layer molecular binding force, and the external small molecules are easy to diffuse along the layer and corrode the coating and the substrate.

Оставить комментарий

Ваш электронный адрес не будет опубликован. Обязательные поля помечены *