Pre-stretch rollers you are describing are used for stretching film or other materials. The control panel allows the user to adjust the stretch ratio up to 250% and the “Stretch Control” feature activates an electromagnetic clutch on the first roller, allowing the stretch ratio to be varied from 0% to 250%.
Door packing machine from FHOPE team provides different solutions.
Tension control: Pre-stretch controller
Operator interface: Separate buttons/Display
Wrap settings: Re-wrap function, overwrap and overlap adjustments
Wrap counters: Independent top, middle and bot-tom
Cycle counters: Total cycle counter and resettable Counter
Emergency stop: Red mushroom head
Electrical disconnect: Lockable
Electrical enclosure: European approved