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A blowdryer or hair dryer is an electromechanical device designed to blow normal or hot air over damp hair, in order to accelerate the evaporation of water particles and dry the hair. Blowdryers allow better control over the shape and style of hair, by accelerating and controlling the formation of temporary hydrogen bonds inside each strand. These hydrogen bonds are very powerful (allowing for stronger hair shaping than even the sulfur bonds formed by permanent waving products), but are temporary and extremely vulnerable to humidity. They disappear with a single washing of the hair. Hairstyles using blowdryers usually have volume and discipline, which can be further improved by the use of styling products and hairbrushes during drying to add tension, hold and lift. Blowdryers were invented around the end of the 19th century. The first model was created by Alexander F. "Beau" Godefroy in his salon in France in 1890. The handheld, household hair-dryer first appeared in 1920. Blowdryers are used both in the beauty salon by professional stylists, and in the average household by consumers. ==Function== Most models use coils of wire that have a high electric resistivity and heat rapidly with an electric current. A fan (usually powered by a universal motor) blows ambient air past the hot coils resulting in heated air effective for drying. The heating element in most dryers is a bare, coiled nichrome wire that is wrapped around insulating mica heating boards. Nichrome wire is used in heating elements because of two important properties: it is a poor conductor of electricity and it does not oxidize when heated. In terms of modern models, a survey of stores in 2007 showed that most hair dryers have ceramic heating elements (like ceramic heaters)—because of their “instant heat” capability. This means that it takes less time for the dryers to heat up, so it takes a lot less time for the hair to dry.〔Kirkland, Kathy (June 2004) "The Big Blow-Dryer Boom", Beauty Story Business's article〕 Many of these dryers have “normal mode” buttons which turn off the heater and just blow room temperature air while the button is pressed. This function is useful in helping to maintain the hairstyle by setting it. The cold air also reduces frizz and can help to bolster the shine in the hair. Many also feature “ionic” operation, to reduce the amount of static electricity build-up in the hair, though the efficacy of ionic technology is nonetheless the topic of some debate. Manufacturers also claim this makes the hair “smoother.” Some stylists today consider the introduction of ionic technology to be one of the most important advances in the beauty industry.〔 Hair dryers are available with different attachments, such as diffusers, airflow concentrators, and comb nozzle attachments. A diffuser is an attachment that is used on hair that is fine, colored, permed or naturally curly. It works by diffusing the jet of air, so that the hair is not blown around while it dries. The hair dries more slowly, at a cooler temperature, and with less physical disturbance. This makes it so that the hair is less likely to frizz and it gives the hair more volume. An airflow concentrator does the exact opposite of a diffuser. It makes the end of the blowdryer more narrow and thus helps to concentrate the heat into one spot in order to make it dry rapidly. The comb nozzle attachment is the same as the airflow concentrator, but it ends with comb-like teeth so that the user can dry the hair using just the dryer without a brush or comb. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Hair dryer」の詳細全文を読む スポンサード リンク
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