| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a cover material free from breakage when forming pleats of a filter material for gas removal, e.g. a deodorizing filter material or a filter material for chemical filter, and to provide a gas-removing unit having low pressure loss and excellent in gas-removing performance by carrying out pleating of the filter material for gas removal using the cover material. <P>SOLUTION: The cover material is composed of a nonwoven fabric having a crimped fiber and has≥10 g/m<SP>2</SP>face density and≤30 Pa pressure loss at 0.5 m/s. The gas-removing unit is obtained by carrying out pleating of the filter material for gas removal using the cover material. <P>COPYRIGHT: (C)2004,JPO</p> |
