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The application of washable filters for particulate respirators in shipyards is reported; the problems concerning maintenance and care of the filters are discussed in consideration of filter features. It was understood that the water-repellent mechanical filters with hard structure are potentially applicable for water washing. In order to resolve the questionable aspects for application in actual field, the tests were conducted, that is, the assigned filters were examined for repeatedly use and wash. Particulate respirators with the filters were used for typical three areas of welding operation, and the used filters were sent to the washing place to be examined and washed, after that the filters were sent back to the welding operation areas. Eleven cycles of the procedure were repeated. As the result, all samples showed that the flow resistance was brought back to the original state and the filtering efficiency kept the original high level after the water washing. It was revealed that the filter could be applied to the actual welding operations repeatedly with water washing. It contributes to the environmental preservation.

Study on Quality Improvement of Filters for Particulate Respirators Used for Welding Work