紡績工場における耳栓使用に関する一考察

概要

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Earplugs were used on four female workers, who had had no experience of working in noisy environment, in order to estimate the effects of sound attenuation. It was found that these earplugs provided attenuation effects of 8 db for 1000 c.p.s., 23 db for 2000 c.p.s., and 30 db for 4000 c.p.s. Forty-three female textile workers in a noisy plant were divied into two groups, one wearing earplugs and the other without them as the control. In the former groups, earplugs showed evidently not only the protection against the temporary threshold shift but also no possibility for the permanent threshold shift, regardless of age. And also, we calculated the noise-induced permanent threshold shift (NIPTS) at 4000 c.p.s. according to the Glorig's formula using noise intensities of 1200 to 2400 to 4800 octave band. Besides, in 22 workers who had, without any protector for two years, been exposed to noises having peak intensity in a range between 1000 and 3000 c.p.s., and 95 overall loundness level at phon, a dip between 4000 and 6000 c.p.s. was detected.
1963-10-20