Ear protective

Ear protective devices are tools to block the ear or ear plugs that are used or used with the aim to protect, reduce exposure to noise into the ear. Its function is to reduce the intensity of noise that reaches hearing instrument. Protective equipment can generally be divided into:
1. Ear plugs (Ear Plug)
The size, shape, and position of the ear canal for each individual is different and even between the two ears from the same individual is different. Therefore, ear plugs should be chosen according to the size, shape, position of the wearer's ear canal. Ear canal diameter ranged from 3-14 mm, but mostly 5-11 mm. Generally the form of the human ear canal is not straight, although there is a small portion that is straight. Ear plugs can reduce noise up to 30 dB.earplug-and-earmuff
Ear plugs can be made from cotton (wax), plastics and synthetic rubber alamai, according to its consumer, to differentiate into 'disposible ear plugs ", ie ear plugs to use to single use only and then discarded, such as ear plugs of cotton, then how pengguanan Another is, "non dispossible ear plugs" that are used for a long time made of rubber or plastic printing.
In its use earplugs have advantages and disadvantages. Advantages of the use of ear plugs which are:
a. Easy to carry because of its small size
b. Relatively more comfortable to wear workplace heat
c. Does not restrict the movement of the head
d. Relatively cheaper than the closing price of the ear (earmuff)
e. Can be used effectively without being affected by the use of goggles, covered coconut, earrings and hair
While the disadvantages include:
a. Requires a longer time than cover the ears for proper installation.
b. Level of protection is smaller than earmuffs
c. It is difficult to monitor whether the labor is difficult to use APT as seen by the supervisor
d. Can only be used by the channel of a healthy ear
e. When the hands are used to put ear plugs dirty, then the ear canal will be susceptible to infection due to irritation.
2. Close the ear (ear Muff)
Close the ear consists of two hoods to cover the ears, may be a liquid or foam that serves to absorb high frequency sound. On long service, often found decreased effectiveness of the ear caused by the pads harden and shrivel due to reaction of the oil bearing material with leather and sweat. Close the ears are used to reduce noise s / d of 40-50 dB with a frequency of 100-8000Hz. The advantages of earmuffs (earmuff) are:
a. One size ear caps can be used by some people with a different ear sizes.
b. Easy to use monitored by supervisors.
c. Can be used with an infection (mild).
d. Not easily lost
The disadvantage of earmuffs are:
a. Uncomfortable heat of workplace
b. Effectiveness and convenience of use, influenced by the use of glasses, headgear, earrings, hair covering the ears
c. Not easily carried or stored
d. Can restrict the movement of the head in a rather cramped workspace.
e. The price is relatively more expensive than earplugs
3. Helmet / enclosure
Covering the entire head and is used to reduce the maximum noise intensity of 35 dBA at 250 Hz to 50 dBA at high frequencies.