NIOSH designs technique to reduce hearing loss

摘要

ATLANTA-NIOSH has developed a low-cost engineering noise control to reduce excessive noise exposures experienced by operators of continuous mining machines.According to the agency,the application of a polyurethane coating to the conveyor's flight bars resulted in a total reduction of 7 decibels in sound level at the operator's position when the conveyor was in operation.The agency also said the coating has been shown to be very durable,displaying almost little or no wear in three months under operating conditions in an underground coal mine.