| 摘要 |
PROBLEM TO BE SOLVED: To provide a mask which can prevent hindrance to respiration as possible as it can, and which can exhibit an effect of trapping fine pollen and can be usable for a long time. SOLUTION: A dust protective mask comprises a filter material composed of a net-like base material made of PET as polymer fibers, coated thereover with a coating material made of a copolymer of vinylideno fluoride as fluorine group resin, and discharge treated by a corona discharge. As a result, the filter member has a high degree of charged amount so as to enhance the dust collecting action, and may have a large mesh size. |
