The fold here is mainly to look at the hardness of the aluminum-plastic panel. Generally, you can fold a corner of the aluminum-plastic panel to see if it is easy to break.

Generally speaking,  good aluminum-plastic panel is not easy to be broken, and the material used PE is generally not easy to break, the panels that  blended with fake materials are also easier to break.

At this point, it is necessary to pay attention to the force, only the force can be seen to see if the aluminum composite panel is good.