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EMG eBACS – Baffle blade control system

Contact-free protection for the strip edges

In hot-dip galvanising lines the zinc coating thickness on the metal strip is determined by means of compressed air-driven blow-off nozzles (air knives) that are located immediately above the zinc pot. The metal strip passing through the system is enlarged by so called "baffle blades" in this area. The aim of using these baffle blades is to avoid any form of air turbulence, which can lead to damage of the zinc layer in the area around the strip edge.

In this application the baffle blades must continuously follow the strip edges, whose position can change due to swarming of the strip or alteration of the strip width. Inductive edge sensors here enable high-precision and contact-free tracking of the baffle blades, thereby preventing damage to the strip edges that can otherwise be caused by the chipping of zinc and/or through the mechanical contact of rollers.

Two inductive ESI1 strip edge sensors are installed on the existing baffle blades for this purpose. The positions of the strip edges are continuously monitored and the baffle blades are automatically tracked. The required gap between the baffle blades and the strip edge is monitored and readjusted at all times. If necessary, this gap can be flexibly adapted to changing production conditions during the ongoing production process via the electronics.

Customer benefits:

  • Homogeneous zinc coating of the strip edge
  • No chipping of the zinc layer
  • No deformation of the strip edge
  • Contact-free position measurement
  • High-precision edge tracing
  • Low maintenance requirements
  • Compact integration
  • Avoidance of mechanical contact rollers

For further detailed information and technical data, please refer to our product brochure.


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