Innovative Drive Solutions

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.

Technology

• Potential of increasing speed accuracy tenfold compared to conventional drive system
• Excellent speed uniformity ensured by a sophisticated control system
• Precise speed control to prevent film thickness variations in machine direction
• Precise torque control leads to stable film tension, minimizing scratches, wrinkles and film breaks

General benefits of Direct Drives

• Improved film quality due to better accuracy
• Lower energy costs due to reduced energy consumption
• Increased line availability due to lower maintenance
• Reduction of spare parts due to elimination of gearboxes, belts and pulleys
• Increased performance and lower noise level due to water-cooled design

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

• Scratch-free preheating in MDO
• Easy operating - only two parameters are needed
• No wear, no belts or gear boxes