The low-contact gripper OGGB from Festo is used for handling highly sensitive solar cells and other fragile items. The gripper transports thin, flexible workpieces with the help of the Bernoulli principle.
Compressed air is accelerated to supersonic speed through a tiny gap, which produces a powerful vacuum on the underside of the gripper. The vacuum is controlled by means of the operating pressure. Maximum lift height can be precisely adjusted, which is particularly important when handling sensitive workpieces such as solar cells.
A further advantage over conventional suction cups is that no dirt (such as silicon dust produced when a wafer breaks) can get into the system, which means that no additional filter systems are required.
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