| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a mask having sufficient structural integrity or stiffness to prevent mask body collapse during respirator use while also exhibiting a low pressure drop to allow for low breathing resistance and extended wearer comfort. <P>SOLUTION: A filtering face-piece respirator 10 has a harness 14 and a respirator body 12. The respirator body 12 is structured such that a snug facial fit can be achieved without use of additional components such as an elastomeric face seal, nose foam, or nose clip. The respirator body includes a filtering structure 18 and a cup-shaped shaping layer where the latter comprises a closed cell foam layer that has a plurality of fluid permeable openings located in it. The openings occupy at least 30% of the total surface area of the shaping layer, including a mid region of the shaping layer. The filtering structure is coextensively disposed over the shaping layer. The shaping layer makes contact with the wearer's face at the respirator body perimeter when the respirator is being worn. <P>COPYRIGHT: (C)2012,JPO&INPIT |
