Spray pattern control structure and method

Abstract From the Canadian patent

Abstract of The Disclosure, The discharge orifice on a fine mist sprayer has a hole through which streams of liquid particles are swirled at high speeds so as to fully atomize the liquid by the time it reaches the exit end of the hole. At that location an annular launching surface for the liquid particles flares outwardly from the hole wall through a curve extending at least 90° from a tangent point on the wall. As a result of this construction the swirling streams progressively increase in diameter as they approach the exit and encounter the flared launching surface and depart at random locations from the surface to thereby produce a spray pattern of substantially circular configuration …