hand held hair dryers came out in 1920.
when did hand held hair dryers come out?
1920
around 1920, hair dryers began to go on the market in handheld form. this was due to innovations by national stamping and electricworks under the white cross brand, and later u.s. racine universal motor company and the hamilton beach co., which allowed the dryer to be small enough to be held by hand. even in the 1920s, the new dryers were often heavy, weighing in at approximately , and were difficult to use. they also had many instances of overheating and electrocution. hair dryers were only capable of using 100 watts, which increased the amount of time needed to dry hair (the average dryer today can use up to 2000 watts of heat).
hair dryer
industrial dryers are used to efficiently process large quantities of bulk materials that need reduced moisture levels. depending on the amount and the makeup of material needing to be dried, industrial dryers come in many different models constructed specifically for the type and quantity of material to be processed. the most common types of industrial dryers are fluidized bed dryers, rotary dryers, rolling bed dryers, conduction dryers, convection dryers, pharmaceutical dryers, suspension/paste dryers, and dispersion dryers. various factors are considered in determining the correct type of dryer for any given application, including the material to be dried, drying process requirements, production requirements, final product quality requirements and available facility space.
industrial dryer