the rustproof roba®capping head with their continuous, impactfree torque, apply screw caps made of plastic with a maximum of precision and repetitive accuracy.roba developed almost maintenancefree generation of capping heads &ndash for minimum downtimes and maximum plant availability.stubborn screw caps on plastic bottles are sometimes very hard to open or cannot be opened at all without using tools.to prevent this, the capping heads which apply these caps in the filling plants and which screw them shut to a defined torque must work precisely and with high repetitive accuracy. roba®capping head, the hysteresis technology not only provides contactless and therefore wearfree torque transmissions it is also impactfree and lowvibration, and thus guarantees a longer plant lifetime.