The hair dryer, also known as blow dryer, is an electrical device used to dry and style hair.
How the hair dryer works
It uses an electric fan to blow air across a heating coil; as the air passes through the dryer it heats up. When the warm air reaches wet hair it helps evaporate the water. Hair dryers may be used with a variety of brushes and combs to achieve different hair styles.
The history
The first generation hairdryer appeared on the market in 1920s. It produced only 100 watts of heat,therefore it did not have enough power to dry hair quickly. It weighed over 1 kg(while our the lightest hair dryer only weight 0.35kg,1800W)because it was made of heavy steel and zinc. Over the next 20 years,engineers improved the design and raised it to 300 watts. By the 1960s, allowed the production of hairdryers with up to 500 watts of power by further improvements in electrical technology.
Early hairdryers were dangerous because if they accidentally came in contact with water they would short circuit and cause an electrical s hock. There are hundreds of recorded cases of accidental electrocutions because a hairdryer was dropped into a bathtub or sink full of water while it was being used.
Modern hair dryer
The power of hair dryers was limited by the electric motors available. As smaller, more efficient motors were developed, greater airflow and greater heat output could be chieved.Improvements in plastic technology and the discovery of new insulating materials made possible a new generation of lightweight hairdryers. By the 1990s portable hairdryers could produce over 1500 watts of heat. Modern hair dryers can produce up 2000 watts of heat and can dry hair faster than ever before.In 2016, Dyson make a smaller hair dryer by relocating the motor to the base of the dryer.
Modern brushless motor hair dryers are lighter and quieter,and have negative ions that protect hair from damage.BLDC hair dryers are becoming more and more popular with customers all over the world. Although cost is relatively expensive at the current,because the BLDC blow dryer they bring a brand new experience to users.
In the next article, we will introduce how to design a hair dryer.
