| 摘要 |
PROBLEM TO BE SOLVED: To provide a filter material suitable for the use as a mask having both of sufficient air permeability and collection efficiency, and excellent in washing resistance. SOLUTION: This filter material for the mask is composed of a three- dimensional structure having the front and back ground weave faces, a connecting yarn for connecting these ground weave faces, and preferably, at least one part of the connecting yarn is composed of hygroscopic fiber. |
