SPRAY DEVICE FOR CATALYST ATOMIZATION
This invention is directed to a method for producing a coating layer of a coating composition by introducing a catalyst as a second component into an atomized stream of a first component of the coating composition. This invention is also directed to a spray gun for producing such coating layer.
1 . A spray gun for producing a layer of a coating composition on a substrate, said spray gun comprising: a spray gun body ( 1 ), a first inlet ( 10 ), a spray nozzle ( 13 ) having a nozzle axis that is a rotational symmetry axis of said spray nozzle, an air cap ( 24 ), a second inlet ( 8 ), a second connection path ( 11 ), and a delivery outlet ( 14 ) having a delivery outlet axis substantially parallel to said nozzle axis;
wherein:
the first inlet is connected to said spray nozzle for conveying a first component of said coating composition to said spray nozzle;
the second inlet is connected to the delivery outlet through said delivery connection path for conveying a second component of said coating composition;
said spray nozzle is configured to produce a spray stream of atomized said first component creating a first siphon zone surrounding the spray nozzle; and
said delivery outlet is positioned within said siphon zone.
2 . The spray gun of claim 1 , wherein said delivery outlet is constructed in said air cap.
3 . The spray gun of claim 1 , wherein the first component is gravity fed into said first inlet.
4 . The spray gun of claim 1 , wherein said second component is gravity fed into said second inlet.
5 . The spray gun of claim 1 , wherein said first siphon zone is a 3 dimensional space surrounding the spray nozzle and in a range of from 0.01 mm to 20 mm away from said spray nozzle.
6 . The spray gun of claim 1 further comprising one or more flow control means for regulating individual flow of the first or the second component.
7 . The spray gun of claim 1 further comprising one or more subsequent second inlets and one or more subsequent delivery outlets, wherein each of the one or more subsequent inlets is connected to at least one of the one or more subsequent delivery outlets.
8 . The spray gun of claim 7 , wherein said second inlet and each of said subsequent second inlets are coupled to a single container for supplying said second component to the delivery outlets.
9 . The spray gun of claim 7 , wherein said second inlet is coupled to a container for supplying the second component, and at least of the one or more subsequent inlets is coupled to a subsequent container for the subsequent component.
10 . The spray gun of claim 7 further comprising at least one flow control means coupled to one of the second or the subsequent second inlets.
11 . The spray gun of claim 1 further comprising a second air channel ( 38 ) for producing a second siphon zone.
12 . The spray gun of claim 11 , wherein said second air channel ( 38 ) is configured within said delivery outlet ( 14 ).