Side seam-coated tin-free steel welded can
AssigneeToyo Seikan Kaisha, Ltd.
InventorsHiroshi Ueno, Seishichi Kobayashi, Yoichi Kitamura
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Abstract
Disclosed is a welded side-seamed can formed by welding a can blank comprising a steel plate substrate having, formed thereon, a coating layer consisting of a metallic chromium layer and a chromium oxide layer formed on the metallic chromium layer, wherein the so-formed side seam has an exposed steel plate layer consisting of a compact and dense steel oxide formed mainly of magnetite, which has a thickness of 50 to 800 A, especially 50 to 400 A, and a coating of a resin or resinous composition consisting of carbonyl, hydroxyl, ether and epoxy groups at a concentration of 10 to 2000 millimoles per 100 g of the resin is formed on at least one surface portion of said side seam through said steel oxide layer.
Claims9
A welded side-seamed can formed by welding a can blank comprising a steel plate substrate having, formed thereon, a coating layer consisting of a metallic chromium layer and a chromium oxide layer formed on the metallic chromium layer, wherein the side seam has an exposed steel plate layer consisting of a compact and dense steel oxide formed mainly of magnetite, which has a thickness of 50 to 800 A, and a coating of a resin or resinous composition containing a polar group selected from the group consisting of carbonyl, hydroxyl, ether and epoxy groups at a concentration of 10 to 2000 millimoles per 100 g of the resin is formed on at least one surface portion of said side seam through said steel oxide layer.
Dependencies are inferred from the claim text.