Aerosol dispensing system

A barrier pack aerosol dispensing system comprising:

• an outer container;
• a flexible inner container positioned within said outer container;
• a propellant region between said inner container and said outer container;
• a mechanical breakup spray head and valve assembly connected to said inner container;
• a relatively non-foaming liquid product within said inner container;
• a neutral propellant within said inner container;
• said neutral propellant being in a liquid state within said inner container and being at least partially soluble or miscible in said liquid product;
• a second propellant in said propellant region;
• said second propellant exerting a differential pressure across said inner container of at least about 30 psig sufficient to eject said product and said neutral propellant through said mechanical breakup spray head on opening of said valve assembly;
• said neutral propellant being present in an amount of about 10 percent or less by volume of the volume of said product and said neutral propellant, and
• said neutral propellant being at least partially vaporized at atmospheric pressure or less on passage of said product and neutral propellant through said spray head to create a turbulence within said spray head which produces breaking up of said liquid product into a fine spray.

An aerosol dispensing system comprising:

• an outer container;
• compressible inner container means positioned within said outer container;
• means to compress said inner container means positioned between said inner container means and said outer container;
• a mechanical breakup spray head and valve assembly connected to said inner container means;
• a finely divided powder product at a pressure above atmospheric pressure within said inner container means due to the force exerted on said inner container means by said means to compress said inner container means;
• a liquified neutral propellant within said inner container means;
• said neutral propellant being present in an amount sufficient to form a slurry with said product and to carry said product into said spray head during discharge of said product, and
• said neutral propellant being at least partially vaporized at atmospheric pressure or less on passage of said product and neutral propellant through said spray head to create a turbulence within said spray head which produces a fine powder spray.