Patent ID: 6742370
Filing Date: 2004-06-01
Classification: F28D,F28F,Y10T

Abstract:
A method of manufacturing metal fins suitable for use in a heat exchanger having a fin density of at least 17 fins per linear inch which comprises:(a) providing a coated patterned fin stock having a series of parallel stripes disposed longitudinally across the width of said fin stock, with said stripes being evenly spaced apart in the central portion of said fin stock, and staggered or more further spaced apart at the edges of said fin stock; (b) passing said fin stock through a series of forming dies to form or draw a plurality of tube receiving collared holes in said fin stock; and (c) slitting or cutting said fin stock longitudinally to form a plurality of fin strips, and whereby said staggered spacing compensates for transverse movement of the fin stock during the drawing operation, and assures for accurate positioning of the collars between said coated stripes.