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Dishwasher : ウィキペディア英語版
Dishwasher

A dishwasher is a mechanical device for cleaning dishes and eating-utensils. Dishwashers can be found in restaurants and private homes. Unlike manual dishwashing, which relies largely on physical scrubbing to remove soiling, the mechanical dishwasher cleans by spraying hot water, typically between , at the dishes, with lower temperatures used for delicate items. A mix of water and detergent is circulated by a pump. Water is pumped to one or more rotating spray arms, which blast the dishes with the cleaning mixture. Once the wash is finished, the water is drained, more hot water is pumped in and a rinse cycle begins. After the rinse cycle finishes and the water is drained, the dishes are dried using one of several drying methods (e.g. a heating element at the bottom of the tub, fans, Zeolites based drying, etc.). Typically a rinse aid is used to eliminate water spots for streak-free dishes and glassware.
Mechanical dishwashing devices were developed in the mid- to late-1800s. A domestic dishwasher was invented in the 1920s, but it did not see widespread use. Dishwashers became more common in wealthy homes in the 1950s. By the 1970s dishwashers had become common. Present-day machines feature a drop-down front panel door, allowing access to the interior. The inside of a dishwasher in the North American market is either stainless steel or plastic.
Mid-to-higher end North American dishwashers often come with hard food disposal units, which behave like miniature garbage (waste) disposal units that eliminate large pieces of food waste from the wash water. Many new dishwashers feature microprocessor-controlled, sensor-assisted wash cycles that adjust the wash duration to the quantity of dirty dishes. Large heavy-duty dishwashers are available for use in commercial establishments (e.g. hotels, restaurants) where a large number of dishes must be cleaned. Washing is conducted with 65–71 °C / 150–160 °F temperatures and sanitation is achieved by either the use of a booster heater that will provide the machine 82 °C / 180 °F "final rinse" temperature or through the use of a chemical sanitizer.
==History==

The first reports of a mechanical dishwashing device are of an 1850 patent in the United States by Joel Houghton for a hand-powered wood device. This device was made of wood and was cranked by hand while water sprayed onto the dishes. This device was both slow and unreliable. Another patent was granted to L.A. Alexander in 1865 that was similar to the first but featured a hand-cranked rack system. Neither device was practical or widely accepted.
The first reliable (hand-powered) dishwasher was invented in 1887 by Josephine Cochrane and unveiled at the 1893 Chicago World's Fair. Cochrane was quite wealthy and never washed dishes herself; she reportedly invented the dishwasher because her servants were chipping her fine china.
In England, William Howard Livens invented a small dishwasher suitable for domestic use in 1924. It was the first modern dishwasher, and incorporated most of the design elements that feature in the models of today; it included a front door for loading, a wire rack to hold the dirty crockery and a rotating sprayer. Drying elements were even added to his design in 1940. It was the first machine suitable for domestic use, and it came at a time when permanent plumbing and running water in the house was becoming increasingly common.〔(【引用サイトリンク】title=Archive Gallery: Kitchens of the Incredible 1950s Future )
Despite this, Liven's design did not become a commercial success, and dishwashers were only successfully sold as domestic utilities in the postwar boom of the 1950s, albeit only to the wealthy. Initially dishwashers were sold as standalone or portable devices, but with the development of the wall-to-wall countertop and standardized height cabinets, dishwashers began to be marketed with standardized sizes and shapes, integrated underneath the kitchen countertop as a modular unit with other kitchen appliances.
By the 1970s dishwashers had become commonplace in domestic residences in North America and Western Europe. By 2012, over 75 percent of homes in the US and Germany had dishwashers.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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