Best Washing Machines and Dishwashers (Chapter 9, page 1 of 2)


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Chapter 9

A dishwasher is a mechanical device that cleans food dishes and eating utensils. Dishwashers are used in restaurants and also in many domestic kitchens. Dishwashers not only save time, water and energy, but also disinfect much better than washing by hand.

While we mostly use physical scrubbing in manual dishwashing, a mechanical dishwasher does the cleaning by spraying hot (55-65 degrees Celsius) water on the dishes to remove soiling.

At first, detergent-added water is used for cleaning purposes, followed by the use of clean water to remove the detergent residue. While some dishwashers have several wash and rinse periods within the complete cycle, some have a rinsing aid that can be added to the rinse cycle. In the absence of any human contact during the washing process, dishwashers can easily use strong detergents which could otherwise have caused damage to the skin. There are some dishwashers that contain a heating element to ensure that dishes are dried quickly. These elements can also be utilized to heat the hot water to the desired wash temperature.

The first evidence of a mechanical dishwashing device is found in an 1850 patent by Joel Houghton, which was a hand-powered device. Today's dishwashers owe their origin to the 1886 invention of Josephine Cochrane, whose hand-powered device was unveiled at the 1893 Chicago World's Fair. In the 1920s, models installed with permanent plumbing were introduced, and 1940s saw the arrival of electric drying elements. By the 1970s, besides commercial spheres, dishwashers became commonplace in domestic spheres also.

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