Patent ID: 7997298

Claim:
A device for regulating the concentration of an alcohol ( 22 ) in a varnish ( 10 ) composition contained in a varnishing vat ( 1 ) comprising: an overflow tray ( 11 ) fixed to an outer side of the vat ( 1 ); a first pipe ( 13 ) connected to both the vat ( 1 ) and the overflow tray ( 11 ) for establishing fluid communication therebetween, the first pipe ( 13 ) including a continuously operating pump for circulating the composition of alcohol ( 22 ) and varnish ( 10 ) from the overflow tray ( 11 ) to the vat ( 1 ); and a second pipe ( 21 ) having first and second ends, the first end being connected to a wall of the overflow tray ( 11 ) and the second end being connected to a sealed alcohol reservoir ( 2 ), the second end of the second pipe being placed higher than the overflow tray ( 11 ), the first end of the second pipe ( 21 ) and the wall of the overflow tray ( 11 ) defining a junction point ( 19 ), the junction point ( 19 ) being positioned below a top edge of the vat ( 1 ); wherein the alcohol/varnish composition, being circulated by the pump, continuously flows over the top edge of the vat ( 1 ) and into the overflow tray ( 11 ), and when a volume of the alcohols evaporates from the alcohol/varnish composition, a level of the alcohol/varnish composition in the overflow tray ( 11 ) is lowered until at least one air bubble can enter into the first end of the second pipe, rise up into the sealed alcohol reservoir ( 2 ), and release a volume of alcohol into the overflow tray ( 11 ), thereby regulating the concentration of the alcohol in the varnish composition.