| 摘要 |
PROBLEM TO BE SOLVED: To provide a filter which is good in handleability and capable of surely having desired performances by stably keeping a shape of the filter wave-form pleated in a cross section. SOLUTION: In the filter, the outer periphery of a filter base material pleated so as to have the wave-formed cross section is surrounded with a frame-shaped frame body and the end edge part of the outer periphery of the filter base material is adhered and fixed to the inner peripheral surface of the frame body. |
