To achieve that, a rotating blade is used. It is made up of an electric resistance that heats the sealing blade and the temperature is monitored by a thermocouple temperature sensor embedded in the blade. A slip ring is then used in order to feed the electrical resistance and retrieve thermocouple signals between the rotating blade and the computer side.

Rotation movement takes place at nearly every step of the process from bottle conveying to label placing. Sometimes, active components are embedded on a rotating plate and linked to the machine computer. Slip ring can perform this link while offering continuous rotation capabilities. Continuous rotation increase machine performance and reliability while easing the machine design.Slip ring can transfer all signal that can be met in such machines, motor power and control, sensors, field buses, etc.

Indeed, rotating arms that are handling the plastic film roll are embedding servomotors with a lot of sensors (optical, proximity, etc.) that allow accurate and smooth film wrapping operations. All those rotating components are connected to the control unit that is integrated into the fixed part of the machine. Slip ring are then mandatory to enable continuous 360° rotation making the pallet wrapping possible.