Recently reported fishing line muscles are soft actuators which can be fabricated by twist insertion in commercially available Nylon 6 monofilament fibers under certain amount of tension. Annealing and Training are needed to retain the twist inserted to complete the fabrication process. These actuators are soft polymeric materials with high stresses, large strain, relatively high power to weight ratio when compared to conventional actuators apart from being cost effective. Though the performance of the muscles is largely dependent on parameters of fabrication, these actuators deform linearly in response to thermal gradient. Actuation can be triggered by varying temperature by any means such as blowing hot fluid or resistive (Joule) heating. The response of the muscles depends on the rate of change of temperature, magnitude of temperature, and applied load. We recognized the potential application of the muscle as a mechanical thermostat as a new design or for use in opening and closing a control valves. Mostly the working range for this muscle is 50–150°C, which is the working range of a wide variety of devices and instruments. This study presents a novel design, fabrication, working principle and preliminary experiments of the thermostat device that is light in weight, simple to manufacture and cost effective.

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