The US-based Glenro Inc’s new high velocity hot air impingement dryer is used to dry a waterbased silicone finish on a spunbonded polyester nonwoven web that is 210 inches wide. The gas-fired dryer system uses high velocity hot air impingement nozzles mounted beneath the product to apply hot air to the web at a right angle. Hot air impingement breaks through the boundary layer of air that surrounds the moving web and transfers heat to the product to vaporise liquids in the coating or finish.