PRODUCTION OF FIN FOR HEAT EXCHANGER

摘要

PURPOSE:To eliminate deterioration in corrosion resistance and heat exchangeability of heat exchanging fins by coating a lubricating material consisting of a base material composed of paraffinic and naphthenic hydrocarbons on an aluminum sheet having an org. or inorg. film, activating the same by heating and pressing the aluminum sheet. CONSTITUTION:A mixture composed essentially of paraffinic hydrocarbon and naphthenic hydrocarbon having 15-20 average number of carbon atoms and 200-350 average mol.wt. is coated on the surface of an expanded aluminum or aliminum alloy sheet having an org. or inorg. film at 1-8mg/dm<2> coating amt., <=150ppm moisture concn. and 5-10cst viscosity. The aluminum sheet is heated to 50-200 deg.C surface temp. to activate the lubricating material then the aluminum sheet is pressed. Flare drop-out and flare crack are thus prevented and the deterioration in the corrosion resistance and heat exchangeability of the heat exchanging fins is prevented.