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Unformatted text preview: 13. 1 Unit 13 Aerosols The term aerosol has two meanings. Scientifically, an aerosol is a suspension of fine particles of liquid in a stream of gas or liquid. In packaging, an aerosol is a pressurized glass or metal package that dispenses liquids or suspensions of powder in sprays, streams, gels, foams, lotions, or gases. Common products that are provided in aerosol packages include household cleaners and furniture polishes, shaving creams, perfumes and colognes, paint, and insecticides. In this unit, we will discuss the development of aerosol containers, their various forms and how they function, and the products that they are used for. 13.1 History of Aerosol Containers Aerosol packaging was initially invented by Eric Rotheim, a Norwegian, in 1923. His product was a liquid ski wax that could be sprayed. For several years there were no other significant applications and the technology was little more than a curiosity until World War II. Much of the war was fought on tropical or subtropical islands and desert areas where insects were a serious irritation, distraction, and danger because they spread malaria, yellow fever, and other tropical diseases. The bug bomb was the first effective weapon in the war against insects and the first significant application of aerosol technology. The bug bombs that were distributed to the troops consisted of three piece metal cans containing a pressurized mixture of insecticide and a propellant. A valve arrangement on the top of the can connected to a dip tube that extended to the bottom of the can. When the actuator was depressed, a valve was opened and the insecticide was forced out along with some of the propellant in a stream of fine liquid particles (an aerosol). The aerosol packages were popular with the soldiers and quickly replaced the flit guns (small hand pumped sprayers) that had previously been used by the troops. The aerosol package was small and rugged and could withstand being rolled on or walked on during combat. The small flit gun sprayers, by contrast, were fragile and frequently damaged or destroyed in the normal course of life. This was the first widespread use of aerosols. Throughout the war, the bug bombs were used from the South Pacific to Europe and were instrumental in inhibiting major outbreaks of disease among armed forces personnel and civilians in the areas. After the war, there were several attempts to exploit the popularity of the aerosol system by marketing the aerosol insecticides as a replacement for the pump units that were still in widespread use; however, because of their higher cost, the units were not commercially successful. A redesigned unit, brought to market in 1947, was more reliable and less costly. It was immediately popular, selling more than 5,000,000 units in the first year. Since then, there has been a steady rate of development and introduction of aerosol products. has been a steady rate of development and introduction of aerosol products....
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- Spring '08