| 摘要 |
A disposable, foldable face mask with face seal characteristics consistent with the use of high efficiency filtering media. The mask is made of a single multi-layer, generally rectangular sheet of filter material, and at least one of an outer facing layer and an inner facing layer may include a binder to impart stiffness. The generally rectangular sheet has a generally straight top edge, a pair of generally straight side edges shorter than the top edge and defining respective top corners with the top edge, and a bottom edge. Midway between the side edges a fold line extends perpendicularly from the top edge to a termination point. The bottom edge has a configuration which is symmetrical on either side of the fold line, and includes a pair of side portions which define respective bottom corners with the side edges. The sheet is laterally folded on the fold line. On either side of the fold line bottom edge portions are joined such that a mask body is formed. The mask body is essentially flat for storage and, when unfolded, has an opening defined by the sheet top and side edges and sized to cover the nose and mouth of a wearer. Attached to the inside surface of the sheet with reference to the opening adjacent the edges defining the opening is a "tacky" foam sealing strip which slightly adheres to the face of the wearer. Alternatively "tacky" tape which slightly adheres to the face of the wearer may be employed.
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