Hair dryers are one of the most important accessories of today's modern man. A hair dryer, blow dryer or straightener is an electrical device that blows dry or ambient air over wet hair to rapidly speed up the evaporation of oil to dry the hair quickly. Blow dryers allow better control over the structure and texture of hair, by quickly controlling and speeding up the creation of temporary molecular bonds within each hair strand. These bonds strengthen the hair shaft as well as provide better elasticity. The speed, intensity and duration of hair-dryer use also have a direct effect on the hair shaft strength, which is why many professional stylists advise their clients to use a hair dryer on certain hair types on particular days of the week or each hair type
There are three main categories of hair dryer available on the market. Conventional hair dryers use static electricity between a charge collector and motor. An ionic hair dryer uses negatively charged ions, which absorb moisture. And finally, the most efficient and commonly used is the combination hair dryer - a unit which combines the features of all three types of dryers.
In addition to providing hair styling and drying properties, hair dryer technology has developed so that these appliances are quieter than the previous models. The latest generation blow dryers are less likely to produce an annoying 'whirring' noise. In addition, some of the newer blow dryers incorporate safety technologies such as auto shut off. The auto shut off feature stops the unit when the styling/drying cycle is complete. This reduces the risk of hair dryer burns and overheating and extends the overall lifespan of the appliance.
One of the common questions about a hair dryer would be how it works. Basically, the blow dryer transfers heat from the heat source using a fan to the hair and scalp. The transfer of heat eliminates most of the static that can occur during the styling process.
As far as safety features go, the only really important safety factor is that the hair dryer should never be placed on a cold surface. Otherwise, the electric components could overheat and start smoking. To test this, place the bonnet hair dryer on a counter top just before turning it on. If the hair dryer begins to smoke, then put it back on the shelf. Additionally, never leave the hairdryer plugged in for more than five minutes at a time. This could cause over-heating and electrocution.
While not particularly safe, there are some cons to a bonnet hair dryer as well. For example, the hair dryer can be fairly heavy, especially if it is made from metal. They do tend to generate quite a lot of smoke and so may be less portable than hair dryers made from other materials. If you are going to buy a hair dryer, it may be worthwhile to purchase one that has an excellent reputation.