Patent ID: 7246438

Claim:
A method for producing a heat exchanger, said method comprising the steps of: (1) providing a louvered fin, said louvered fin comprising: (a) a first corrugated strip having planar and connecting portions that are alternately arranged to make a corrugation, said first corrugated strip extending straight in a longitudinal direction; (b) a plurality of first louvers formed in each planar portion such that said first louvers are arranged in a lateral direction perpendicular to said longitudinal direction, said first louvers in each planar portion being configured to be in asymmetry with respect to a center line of the planar portion in said lateral direction; (c) a straightening member for keeping said first corrugated strip in a straight shape in said longitudinal direction, said straightening member extending along a longitudinal side of said first corrugated strip; and (d) a first bridge member for attaching said first corrugated strip and said straightening member together, (2) fixing said first corrugated strip between first and second adjacent tubes of said heat exchanger such that said first corrugated strip is kept in said straight shape by said first and second tubes; and (3) detaching said straightening member from said first corrugated strip by breaking said first bridge member such that there is provided a first sandwiched structure having said first corrugated strip fixed between said first and second tubes.