| 摘要 |
PROBLEM TO BE SOLVED: To provide a corrugated fin, in which each louver formed in a corrugated fin is inclined only in the same direction, and prevent the entire fins from deforming curvedly in a planar fan-shape in the course of forming the louvers. SOLUTION: In the edge at least on one side in the corrugated fin wave, a folded edge 2 is formed by being folded double continuously in the direction of the wave edge.
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