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| Q: I would like to spray the 1500 cSt kinematic viscosity oil with 2 cc/s flow rate. Is it possible with airless method? If it's possible, could you suggest something? A: In general, airless spray guns can spray high viscosity fluids, even in the high viscosity range that you mentioned in your email, namely 1,500 cSt. I have checked with a representative from Graco who confirmed this, but he mentioned that your desired flow rate is very low for the tip sizes that are offered by Graco. The two major companies that I am aware of who sell airless spray equipment are www.graco.com and www.nordson.com. You might need to send a sample of the oil to one of these vendors so that they can select the appropriate tip size for you. Remember that when you design the tip for an airless gun you must specify not only the fluid flow rate but also the fan width and the distance from the tip to the part you are coating. In other words, you might specify a 2" fan width at 4" distance. Alternatively, you might need to have an engineer who is knowledgeable on atomization design a special tip for your specific application. If you find a solution to your problem, can you please get back to me and tell me how you solved it?
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© 2009 - Ron Joseph, Paint Consultant in Saratoga, California |
