Low drift spray method

Abstract

In low drift spray nozzles and a method of applying low drift sprays, liquid is formed in large droplets by imparting a swirling motion to the liquid in a chamber of the nozzle, passing the swirling liquid through a first orifice into another chamber of the nozzle which is larger in cross section than the orifice, and discharging the swirling liquid from the last mentioned chamber through a second orifice which is at least as large in cross section as the first orifice, whereby the discharged liquid forms a hollow geometric shape having large droplets of the liquid therein.

What is claimed is: 
     
       1. A method of producing large droplets of liquid comprising imparting a swirling motion to said liquid,   passing said swirling liquid through first orifice means into a chamber larger in cross section than said first orifice means and such that the liquid continues to swirl in the chamber, and   producing a swirling discharge having a plurality of substantially large droplets of liquid therein by discharging the swirling liquid from said chamber through a second orifice at least as large in cross section as the first orifice means .Iadd., but substantially smaller in cross section than said chamber. .Iaddend.   
     
     
       2. The method of claim 1 wherein the area of said second orifice means is at least as large as the area of said first orifice means. 
     
     
       3. The method of claim 1 wherein said first and second orifice means are circular and said discharged liquid assumes the shape of a hollow cone. 
     
     
       4. The method of claim 3 wherein the ratio of the diameter of said second orifice means to the diameter of said first orifice means is at least 1.33. 
     
     
       5. The method of claim 1 wherein said discharged liquid assumes a hollow geometric shape.