The conveyor belt normally carries material on its surface.
The a set of 2 suction conveyors sucks backside of the material and later surface of the material like the animation below. Orange substance is material carried.
This is realized in this setting.
When you need process in both sides of the material, this configuration is one of choices.
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Steel belt video: http://www.youtube.com/results?search_query=dymcooverseas&sm=12
Steel belt video: http://www.youtube.com/results?search_query=dymcooverseas&sm=12
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