| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a technique which is effective in balancing the breathability and the trapping efficiency at a high level of a mask to be worn on the face of a wearer. <P>SOLUTION: The mask 1 is provided with a mask body 10 which covers at least the mouth and the nose of the wearer and a pair of ear-hook parts 20 which extend from both sides of the mask body 10 and are hung on the ears of the wearer. The mask body 10 includes a first fiber sheet and a second fiber sheet which are formed by providing nonwoven fiber sheets of polypropylene fibers with electret properties. The first fiber sheet is constituted as a nonwoven fiber sheet having an average fiber diameter of 0.5-3 μm and a basis weight of 1.5-5 g/m<SP>2</SP>. The second fiber sheet is constituted as a nonwoven fiber having an average fiber diameter and a basis weight both larger than those of the first nonwoven fiber sheet. <P>COPYRIGHT: (C)2010,JPO&INPIT |
