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KMID : 0381319930320030093
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Korean Journal of Occupational Health
1993 Volume.32 No. 3 p.93 ~ p.105
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Noise Characteristics of Offset Printing Machines
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Abstract
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For the purpose of disclosing noise characteristics of offset printing machines and obtaining reference materials for the prevention of occupational deafness of their operators, sound levels and octave band sound pressure levels of 117 machines in 53 printing firms in Seoul and Kimpo-gun area, were investigated with special reference to their maximum paper size, the speed of rollers, the number of printing colors and the age of the machines.
The results were as follows:
1. About fifty-seven percent of 468 noise measurements showed sound levels of 85-89 dB(A) and about 9% showed sound levels of 90-94 dB(A). The majority of machines investigated belonged to low frequency type noise sources.
2. Sound levels of printing machines increased as the maximum paper size increased.
3. Sound levels of printing machines increased as the speed of rollers increased.
4. Sound levels of printing machines tended to increase up to 4-color printing processes as the number of printing colors increased.
5. Sound levels of printing machines tended to increase in parallel with the age of machines up to 15 years.
6. Stepwise multiple regression analyses showed that sound levels were most significantly contributed by the maximum paper size, followed by the speed of rollers. Mean while, octave band sound pressure levels were most significantly contributed by the maximum paper size in lower frequencies, followed by the speed of rollers. On the other hand, in higher frequency zones, sound pressure levels were significantly contributed by the speed of rollers which was followed by the maximum paper size.
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