A nylon thread twisted up into a spiral can be used as an artificial muscle. The twisted thread is triggered to untwist by the heat of an electric current, ultimately leading to a contraction. Stopping the heat supply leads the nylon thread to return to its original length. The twisted nylon thread is also capable of lifting a hundred thousand times more weight than a conventional nylon thread.
In the experimental setup shown here, current was supplied to the twisted polyamide thread, which then was used to construct a gripper. Generally said the artificial muscle made of nylon can be used in many different areas, such as the textile industry, robotics or prosthetics.