What are the main reasons for the deformation of aluminum panels?

Everyone should know that aluminum panels are widely used in building curtain wall design, but aluminum panels are prone to deformation during long-term use. Although this phenomenon is not common, we cannot ignore this problem. Below, PRANCE aluminum panel manufacturing will explain the main causes of aluminum panel deformation based on many years of experience. I hope it will be helpful to everyone.

1. Aluminum panels have no side ribs or middle ribs and are deformed under the action of wind pressure and air expansion.

It can be said that this kind of deformation often occurs on aluminum panel curtain walls with aluminum-plastic panels as panels. At this stage, many customers will choose low-priced aluminum panel manufacturers to save costs. In order to obtain higher profits, manufacturers do not Install side and center ribs. Instead, the aluminum panels are folded into a box, which is screwed directly to the frame and the panel seams sealed with glue. This will cause the strength of the aluminum panel to fail to meet the project requirements. Under the action of positive and negative wind pressure, the aluminum panel will deflect from the inside to the outside, causing the size of the aluminum panel to increase.

Due to the construction technology of the curtain wall where the sunny side is relatively prominent, all board joints are sealed with glue in the form of an insulating wall. The air in the space between the surface of the aluminum panel and the structural wall is heated by the action of light, and the aluminum panel curtain wall deforms outward under the action of air expansion.

2. The panels and the curtain wall structural frame are fixed, and the thermal stress cannot be released. In areas with large seasonal temperature differences, such as in the low temperature seasons of early spring and late autumn, the thermal effect of solar radiation is very strong, especially the thermal expansion value per meter of darker aluminum panels. It varies greatly at different temperatures. When the curtain wall frame is indoors, the impact of sunlight is very weak. When the aluminum panel and frame are at their largest, the temperature difference can reach 80C. When the size of the aluminum panel is larger, a larger linear expansion difference will occur. If the aluminum panel structure is folded and the aluminum panels are fixed to the frame with screws, the thermal stress on the surface of the aluminum panels cannot be released, forcing the panels to yield and deform outwards under the action of air.

3. Stress and deformation will occur when panels and edge ribs are assembled.

In order to solve the thermal stress deformation on the surface of the aluminum panel, some aluminum panel manufacturers add a rib frame around the unit panel, especially the aluminum-plastic composite panel. In the production process, according to the folding size of the board on the slotting machine, the board is planed and folded into a box shape.

Cut another rib frame according to the size of the board, then install the side rib frame into the box panel, and fix the two parts with blind rivets. At the project site, it is often found that there are deviations in the folding of the plate grooves and deviations in the assembly of the side rib profiles into the frame. When two objects match, either the frame is too small or the hem size is too large. In order to ensure the construction period and not consume materials, assembly is often forced, resulting in assembly stress on the surface of the board, that is, deformation of the edge ribs or compression deformation of the board surface. The plate deforms outward under the action of temperature and air expansion forces.