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PubMed1982

[Auditory threshold and the degree of its temporary and permanent shifts in the textile industry workers].

Hearing threshold was measured with digital audiometer CASK-431 in transportable soundproof booth GIG-AU-1 in 170 women and 75 men before and at the end of the afternoon shift work in the weaving-mill with shuttle looms, where an average noise level was 100 dB(A). The average hearing losses calculated from the formula dB (1000 Hz + 2000 Hz + 4000 Hz): 3 were higher than those calculated from the formula db (500 Hz + 1000 Hz + 2000 Hz): 3. There was also a higher correlation coefficient between the occupational exposure to noise and the values of hearing loss calculated according to the former of the mentioned formulae, as compared to the latter. Workers wearing individual hearing protectors from the glass microfibres suffered from temporary threshold shift (TTS) of few dB whereas in those wearing no hearing protectors the TTS attained 10 to 24 dB on average. Among the women--workers of comparable age and occupational exposure to noise the hearing losses were higher in those living in noisy communities than in those living in quiet communities. This result is indicative of cumulative effects of community and industrial noise in respect to the hearing damage. Regulations for permissible noise levels in occupational environment should involve the kind of exposure to the community noise.

Adolescent↗
PubMed1982

[A new method for the microbiological evaluation of disinfecting laundering procedures for textiles].

A new method is described to evaluate the efficacy of disinfecting laundering processes. Testpieces (contaminated cotton fabric patches) are enclosed between a pair of membrane-filter discs. Being immersed in the wash liquor this test system acts as a perfusion chamber permeable for detergent and disinfectant solution but retaining the testbacteria to the testpieces. Tests performed in a shaking water bath as well as practical laundering processes with detergents showed the following: from contaminated test pieces wrapped in cotton fabric - as commonly used in such experiments - test bacteria can hardly be recovered even after a non-bactericidal washing process. This is a result of mechanical wash-off. In contrary, with the new method reductions of viable counts are mainly due to bactericidal effects as physical removal of testbacteria is prevented by the filter membranes. Thus, disinfecting laundering procedures are readily distinguishable from merely cleaning ones. As additional advantage the filter-method prevents test pieces from being contaminated by other bacteria carried by the wash liquor.

Disinfection↗