Extended data
Divided by function
Noise, water in the ear and uneven pressure on both sides of the eardrum are the three main factors that damage our hearing.
The main hearing protection products are: anti-noise earplugs, waterproof earplugs and pressure control earplugs.
Necessities of labor protection
Labor protection and noise prevention earplugs are generally made of silica gel or low-pressure foam material and high-elastic polyester material. After being inserted into the ear canal, it is in close contact with the external auditory canal to isolate sound from entering the middle ear and the inner ear (eardrum), so as to achieve the purpose of sound insulation, thus protecting the hearing of workers.
Labor protection and noise-proof earplugs can prevent the eardrum discomfort caused by the sound emitted by the machine, and have good noise-proof performance, but they are hard and have obvious swelling pain when worn, so they are not suitable for sleeping. General labor protection earplugs are equipped with ropes for easy removal at any time.
Distinguish between good and bad.
The rebound effect is slow and the elasticity is too great. When the anti-noise earplug expands, it will press the skin of the external auditory canal, which may cause discomfort such as ear swelling and earache. If the elasticity is too small, it can not be in close contact with the external auditory canal, and the sound insulation effect is reduced. So be sure to observe the rebound speed of earplugs. The longer the rebound time, the better the quality.
References:
Baidu encyclopedia-earplugs