Patent ID: 9217194
Filing Date: 2015-12-22
Classification: B05B,B05C,C23C,D21H,F26B

Abstract:
1. A device for controlling the thickness of a coating made of a liquid film on a moving strip ( 3 ), comprising a nozzle ( 1 ) fed with a pressurized gas ( 11 ) in a chamber ( 5 ) of the nozzle, said chamber ( 5 ) being terminated by nozzle lips making an elongated opening ( 4 ) for discharging the pressurized gas onto the moving strip ( 3 ), said elongated opening ( 4 ) being provided with automated means for reducing gas flow at each transversal side of the nozzle ( 1 ) outside the strip width, characterised in that said automated means for reducing the gas flow at each of said nozzle sides comprise a moving carriage ( 10 ) guiding a retractable cable ( 9 ) able to be applied respectively onto and out of the gas discharge opening ( 4 ), inside the nozzle chamber ( 5 ), and in that, at each transversal side of the nozzle, a transition, between an external nozzle section where the gas flow is reduced and an internal nozzle section where the gas flow is not reduced, is assured by two together-moving grooved wheels or pulleys ( 6 , 7 ) connected to the moving carriage ( 10 ), located side by side and having their axis perpendicular to the nozzle, so that the cable ( 9 ) is successively located against the opening ( 4 ) on an external side of the first pulley ( 6 ), between the two pulleys ( 6 , 7 ) and distant from the opening ( 4 ) on an internal side of the second pulley ( 7 ).