Brückner's drive concept uses the latest technology of leading suppliers for high precision speed-control of the line. Profinet (Process Field Net), an industry technical standard for fast data communication over industrial Ethernet, ensures high speed and precision for control of the drive system.
There are specific drive solutions available for various components of a film stretching line in order to provide the best performance:
Brückner is using its advanced direct drive system for rollers in the chill roll, machine direction orienter (MDO), transverse direction orienter (TDO), pull roll stand and winder. The motor is directly mounted to the roller's shaft with direct drives. That means no gears, no belts – and therefore no contamination from the belts’ wear, as well as low maintenance requirements.
General benefits of Direct Drives
Soft drives for the MDO are nowadays standard in new Brückner film stretching lines. Brückner Servtec also installs them in existing lines in order to improve the film quality and productivity.
In the MDO all rolls are stiffy linked by the film. Any small speed difference creates high forces which can result in scratches on the film surface. The upgrade solution for older lines are soft drives which replace the stiff and inflexible belt / pulley drive with directly shaft mounted motors.
This allows easy tension setting in the pre-heating zone, flexible tension distribution along the pre-heating rolls and scratch free pre-heating in the MDO. Furthermore, since there are no longer belts and gear boxes, maintenance costs will be reduced due to less wear parts.
Benefits of MDO Soft Drives