Inspection station and method for inspecting sheet material

An inspection station for inspecting crimped sheet material, the station comprising:

• a light source arranged to illuminate crimped sheet material in an inspection location;
• a vibrating device adapted to vibrate crimped sheet material in the inspection location for dislodging loose material on the surface of the sheet material in the inspection location, wherein the vibrating device comprises an ultrasonic transducer and a vibrating element in the form of a bar, wherein crimped sheet material is guidable along or over the vibrating element for the crimped sheet material to be vibrated by the vibrating element;
• a detector for detecting light received from the vibrated crimped sheet material, thereby providing images of the crimped sheet material;
• a controller adapted to determine from images of the crimped sheet material loose material on the crimped surface of the crimped sheet material, and adapted to provide a true status of the crimped surface of the crimped sheet material, the true status representing the surface of the crimped sheet material without loose material.