Sprays

Aerosol spray is a type of dispensing system which creates an aerosol mist of liquid particles. This is used with a can or bottle that contains a liquid under pressure. When the container's valve is opened, the liquid is forced out of a small hole and emerges as an aerosol or mist. more...

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As gas expands to drive out the payload, some propellant evaporates inside the can to maintain an even pressure. Outside the can, the droplets of propellant evaporate rapidly, leaving the payload suspended as very fine particles or droplets. Typical liquids dispensed in this way are insecticides, deodorants and paints. An atomiser is a similar device that is pressurised by a hand-operated pump rather than by stored gas.

History

The concepts of aerosol probably goes as far back as 1790. The first aerosol spray can was invented in Oslo in 1926 by Erik Rotheim, a Norwegian chemical engineer. The patent was sold to a US company for 100,000 Norwegian kroners. The Norwegian Post Office celebrated the invention by issuing a stamp in 1998.

It was not until 1941 that the aerosol spray can was first put to good use by Americans Lyle Goodloe and William Sullivan, who are credited as the inventors of the modern spray can. Their design of a refillable spray can dubbed the “bug bomb�, was patented in 1943, and is the ancestor of many popular commercial spray products. Pressurized by liquefied gas, which gave it propellant qualities, the small, portable can enabled soldiers to defend against malaria-carrying bugs by spraying inside tents in the Pacific during World War II. In 1948, three companies were granted licenses by the United States government to manufacture aerosols. Two of the three companies still manufacture aerosols to this day, Chase Products Company and Claire Manufacturing. The \"crimp-on valve\", used to control the spray was developed in 1949 by Bronx machine shop proprietor Robert H. Abplanalp.

Technology (aerosol propellants)

If the can was simply filled with compressed gas, either it would need to be at a dangerously high pressure, or the amount of gas in the can would be small, and it would soon run out. Hence, usually, the gas is the vapour of a liquid with boiling point slightly lower than room temperature. This means that inside the pressurised can, the vapour can exist in equilibrium with its bulk liquid at a pressure that is higher than atmospheric pressure (and able to expel the payload), but not dangerously high; yet, as gas escapes, it is immediately replaced by more evaporating liquid. Since the propellant exists in liquid form in the can, it should be miscible with the payload or dissolved in the payload.

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