Abstract
Abstract High noise levels and edge overcoating problems have been encountered in the gas wiping of hot dip galvanised layers on steel strip in a continuous line. These have been examined and analysed. Noise levels were decreased by up to 10 dBA by using edge baffles to reduce direct collision of wiping air jets. Average overcoating of zinc in the zone within 50 mm of the strip edge could be decreased by 50% or more during air wiping by using edge baffles with a baffle to strip distance of 20 mm or less. The extent of edge overcoating has been related to the edge drop of the gauge of the substrate. If the combined profile of the edge overcoating and the edge drop of the substrate exhibited a noticeable high spot of about 10 μm in the edge zone, edge buildup formed along the high spot, mostly in the edge area 10–30 mm from the edge. Edge baffles have effectively reduced this type of edge buildup.
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