Filter medium for turbine and methods of using and producing the same

摘要

The present invention is to provide a filter medium for a turbine in which contamination is less likely to be caused in the turbine, and an increase in pressure loss is suppressed. One form of this filter medium includes a porous polytetrafluoroethylene (PTFE) membrane (1) and an air-permeable supporting member (2). The air permeable supporting member (2) has a fiber diameter of not more than 15 mu m. This filter medium is used by disposing the air-permeable supporting member (2) on an upstream side of the porous PTFE membrane (1) with respect to air flow passing through the filter medium toward the turbine. Another form of the filter medium of the present invention includes a porous PTFE membrane, a first air-permeable supporting member, and a second air-permeable supporting member.