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KMID : 0388919880050000004
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Occupathional Health
1988 Volume.5 No. 0 p.4 ~ p.15
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A study of the noise working environment and occupational hearing impairment in the manufactoring industries
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이채언/LEE, C.U
이종태/손혜숙/문덕환/조병만/김성천/배기택/LEE, J.T/SHON, H.S/MOON, D.H/CHO, B.M/KIM, S.C/PAE, K.T
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Abstract
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In order to proffer the fundamental data for the better working environment and the effective establishment of hearing conservation program on workers exposed to industrial noise, author assessed noise levels on the 42 noisy processes among 84 manufactures of 9 industries and measured noise hearing loss by the type of industries on 3,104 workers a these noisy processes from March, 1986 to Februry, 1987.
The results were summarized as follows :
1. The averge of A-weight sound level of 23 processes(54.8%) and the avergae of sound level at octave band of 14 processes(33.3%) exceeded the permissible exposure limits in 8 hours per day.
2. The noise level was the highest in process of cocking of ship building(109.1dBA), and followed by plating of steel rolling(104.3dBA), rivet of manufacture of motor vehicles(102.5dBA), shot of ship building(98.5dBA), aciding(95.7dBA) and steel tubing(95.0dBA) of steel rolling, weaving of textiles(95.0dBA).
3. The permissible exposure time for the average of sound level at each octave band was only 30 minutes in the process of cocking of ship building, plating of steel rolling and rivet of manufacture of motor vehicles.
4. As a result of audiometric examination in 3,104 workers, the rate of hearing loss over 50dB at 4,000Hz was 7.396(227 workers) and the rate of hearing loss over 41dB at 6-average method was 2.996(89 workers).
5. The prevalence of occupational hearing loss in ship building and manufacture of motor vehicle was 52% and it was the highest among prevalence of these 9 industries.
6. As a result of this suvery, the noise control and hearing conservation program were required especially in the industry of ship building and manufacture of motor vehicle.
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