FIN MATERIAL FOR SERRATED FIN TUBE, AND MANUFACTURING METHOD THEREOF

摘要

PROBLEM TO BE SOLVED: To provide a fin material for a serrated fin tube which is not torn from a notch or broken when the fin is wound around the tube. SOLUTION: Small holes 7 are formed in notch ends of the fin material with notches 1 made on one side at predetermined spacing, and when the fin is wound around the tube, and the notches 1 are opened in a V-shape, the stress is distributed around the small holes 7 so that the fin is less easily torn.