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AssigneesDenso Corporation, Sumitomo Light Metal Industries, Ltd.
InventorsSHOEI TESHIMA, YOSHIHARU HASEGAWA, ICHIRO TANINAKA, TSUTOMU USAMI, YUJI HISATOMI
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An aluminum-extruded multi-cavity flat tube for use in an automotive heat exchanger having excellent brazing characteristics that make it possible to dispense with a flux coating step when assembling a heat exchanger component, or to use an aluminum fin not clad with brazing metals in place of a brazing sheet, as enabled by pre-coating either a flux composition or a brazing composition on a flat surface of an aluminum-extruded multi-cavity flat tube uniformly with excellent adhesion and transfer printing performance. At least one of the flat surfaces of said aluminum-extruded multi-cavity flat tube is coated with a flux composition comprising brazing flux and a synthetic resin based, as its main constituent, on a methacrylate homopolymer or a methacrylate copolymer, or alternatively with a brazing composition comprising a brazing flux, brazing metals, and said synthetic resin. In a preferred embodiment, such a coating is provided by applying to a surface of an aluminum-extruded multi-cavity flat tube said compositions as added to an organic solvent, having a molecular structure wherein the atomic ratio of carbon to oxygen is between 2 and 3, through a roll-transfer printing technique.
An aluminum-extruded multi-cavity flat tube having excellent brazing characteristics for use in automotive heat exchangers, wherein at least one of the flat surfaces of the tube is coated with a brazing flux composition comprising brazing flux and a synthetic resin based, as its main constituent, on a methacrylate homopolymer or a methacrylate copolymer.
An aluminum-extruded multi-cavity flat tube having excellent brazing characteristics for use in automotive heat exchangers, wherein at least one of the flat surfaces is coated with a brazing composition comprising a brazing flux, brazing metals, and a synthetic resin based, as its main constituent, on a methacrylate homopolymer or a methacrylate copolymer.
A method for manufacturing an aluminum-extruded multi-cavity flat tube having excellent brazing characteristics for use in automotive heat exchangers, wherein at least one of the flat surfaces of an aluminum-extruded multi-cavity flat tube is coated with a mixed flux composition comprising brazing flux powders added to an organic solvent in which a synthetic resin based, as its main constituent, on a methacrylate homopolymer or a methacrylate copolymer is dissolved using a roll-transfer printing technique, and subsequently heated or dried to evaporate the organic solvent in the mixed flux composition.
A method for manufacturing an aluminum-extruded multi-cavity flat tube having excellent brazing characteristics for use in automotive heat exchangers, wherein at least one of the flat surfaces of the aluminum-extruded multi-cavity flat tube is coated with a mixed brazing composition comprising brazing flux powders and brazing metal powders added to an organic solvent in which a synthetic resin based, as its main constituent, on a methacrylate homopolymer or a methacrylate copolymer is dissolved using a roll-transfer printing technique, and subsequently heated or dried to evaporate the organic solvent in the mixed brazing composition.
Dependencies are inferred from the claim text.