Understanding the Concept:
Pharmaceutical aerosols consist of a pressurized system containing propellants, active ingredients, a container, a valve assembly, and an actuator. Each component serves a distinct mechanical purpose.
Aerosol System Functional Analysis:
• Propellant: Supplies the internal pressure required to expel the product from the container.
• Valve: Regulates the flow and controls the emission of the product from the pressurized container.
• Dip Tube: Conveys the liquid formulation from the bottom of the container up to the valve assembly.
• Actuator: The button or nozzle that the user depresses. It contains specialized internal channels that break up the liquid stream into a fine mist, spray, foam, or solid stream. It directly controls the physical form and particle size distribution of the delivered product.
Therefore, the actuator is the component responsible for ensuring the product is delivered in its proper and desired physical form.