	US 7,593,790 B2
	Method for designing aerosol spray dispensers
Richard S. Valpey, III, Lindenhurst, Ill. (US); Paul A. Clark, Racine, Wis. (US); Peter S. Smereka, Ann Arbor, Mich. (US); Padma Prabodh Varanasi, Racine, Wis. (US); and Joel E. Adair, Racine, Wis. (US)
Assigned to S.C. Johnson & Son, Inc., Racine, Wis. (US)
Filed on Jul. 21, 2005, as Appl. No. 11/186,057.
Claims priority of provisional application 60/590368, filed on Jul. 23, 2004.
Prior Publication US 2006/0026817 A1, Feb. 09, 2006
Int. Cl. G05D 7/00 (2006.01); G06F 19/00 (2006.01); G06F 17/00 (2006.01); G01F 1/00 (2006.01); G01F 17/00 (2006.01); G06G 7/50 (2006.01); B65D 83/14 (2006.01)

U.S. Cl. 700—283 [73/861; 700/97; 700/231; 702/45; 702/50; 703/9; 222/635; 222/645; 222/649]

5 Claims

1. A method of determining a preferred fluid for dispensing from an aerosol spray container in an aerosol spray dispensing system and designing the aerosol spray dispensing system, the method comprising the steps of:

predetermining a propellant concentration (x₅) for the aerosol dispensing system;

determining properties of an aerosol spray container for use in the aerosol spray dispensing system, the properties including an exit orifice diameter (x₁), a vapor tap diameter (x₂), a dip tube diameter (x₃), a body orifice diameter (x₄), and a stem cross section area (x₆);

selecting a value for each of one or more desired performance characteristics (Φ) of the system;

determining fluid properties of a fluid for dispensing from a provided aerosol spray container in accordance with the following equation:

wherein the fluid properties include a density (x₇), a low sheer viscosity (x₈), a high sheer viscosity (x₉), an initial surface tension (x₁₀), an equilibrium surface tension (x₁₁), a partition coefficient (x₁₂), and a Zahn viscosity (x₁₃), and a, b, c, and d are coefficients unique to each of the one or more performance characteristic; and

designing the aerosol spray dispensing system according to properties determined in the determining steps.