| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a filter in which the number of separators in the filter material can be decreased by half and the distance between folded lines can be firmly maintained against pressure of air. SOLUTION: The filter 11 has separators 14, 15 arranged at specified intervals on both surfaces of a pleated filter material 12 so as to maintain the distance between folded parts of the filter material 12. The separators 14, 15 are alternately arranged to prevent overlapping on both surfaces of the filter material, while the separators facing each other are joined with each other on one surface of the filter material 12.</p> |
