aerosol dispenser

aerosol dispenser,

device designed to produce a fine spray of liquid or solid particles that can be suspended in a gas such as the atmosphere. The dispenser commonly consists of a container that holds under pressure the substance to be dispersed (e.g., paints, insecticides, medications, and hair sprays) and a liquefied gas propellant. When a valve is released, the propellant forces the substance through an atomizer and out of the dispenser in the form of a fine spray. These devices are more properly termed spray dispensers rather than aerosol dispensers because the particles of the dispersed substance are usually larger than the particles of a true aerosol (see colloidcolloid
[Gr.,=gluelike], a mixture in which one substance is divided into minute particles (called colloidal particles) and dispersed throughout a second substance. The mixture is also called a colloidal system, colloidal solution, or colloidal dispersion.
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), such as a fog or a smoke. FreonFreon
[trade name], any one of a special class of chemical compounds that are used as refrigerants, aerosol propellants, and solvents. These compounds are haloalkanes, i.e., halogen derivatives of saturated hydrocarbons (see alkane).
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 was the most common aerosol propellant, but its use has been banned because it is believed to contribute to destruction of the ozone layerozone layer
or ozonosphere,
region of the stratosphere containing relatively high concentrations of ozone, located at altitudes of 12–30 mi (19–48 km) above the earth's surface.
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 of the stratospherestratosphere
, second lowest layer of the earth's atmosphere. The level from which it extends outward varies with latitude; it begins c.5 1-2 mi (9 km) above the poles, c.6 or 7 mi (c.10 or 11 km) in the middle latitudes, and c.10 mi (16 km) at the equator, and extends outward c.
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; common propellants now include propane, butane, and other hydrocarbons.
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References in periodicals archive ?
The patent covers an anhydrous base composition suitable for incorporation in an anhydrous aerosol composition intended for discharge from an aerosol dispenser. The base composition is comprised of a particulate astringent antiperspirant salt; an anhydrous carrier fluid for said particulate salt; and a humectant.
"The officer found a canister with an aerosol dispenser, which in his view was very similar to the CS spray that officers are administered with in their duty."
Immediately thereafter, the basal 10 cm of each tree trunk was coated with a layer of sticky material (Tanglefoot[R]) applied from an aerosol dispenser. Similarly, the sticky material was also applied to the surface of the plastic in a 2 m radius around each tree.
The device is a hand-held aerosol dispenser with electronic controls that determine how much active pharmaceutical material is dispensed.
The device is a handheld aerosol dispenser with electronic controls that determine how much active pharmaceutical material is dispensed.
Each can's 3,800 metered sprays may be released manually, or automatically by Nilodor's Aerosol Dispenser or a similar dispensing cabinet.
The Scent Machine[TM] is an automatic aerosol dispenser system that uses an automatic timer to release a meter-measured spray of scent every 3 1/2 minutes.
An automatic aerosol dispenser and dispensing system utilizing a remotely programmable controller has been patented by CCL Industries, Toronto, Canada.