Patent ID: 6713129
Filing Date: 2004-03-30
Classification: C23C

Abstract:
A method of gas wiping a plating material from metallic strip lifted from a liquid plating bath and caused to travel continuously upwardly along a jet treatment path, comprising:impinging gases from face gas wiping nozzles extending widthwise of a strip material, said strip having front and back surfaces and side edges, said strip carrying bath liquid on its surfaces by pickup from said bath, arranging said face gas wiping nozzles adjacent to said jet treatment path and directing said gas in a direction to impinge gases onto said front and back surfaces of said strip material, and aiming said gases at an impingement area on said front and back surfaces of said strip material, thereby limiting the pickup of said bath liquid carried by said front and back surfaces of said strip material; arranging a pair of baffle plates in a position spaced from said edges of said strip material and in a position adjacent to said gas impingement area; said baffle plates being separated from said edges of said strip material by a distance C; and aiming edge wiping nozzles between each of said baffle plates at its inner edge and adjacent an edge of said strip material, each said edge wiping nozzle being provided with an edge wiping gas jet port positioned adjacent said gas impingement area, directing each said edge wiping nozzle for jetting a gas in a widthwise direction relative to said strip material and substantially paralel to each adjacent edge of said strip material; wherein said distance C between said edge of said strip material, and said inner edge of said baffle plate is within the range room 4 to 7 mm; and adjusting and controlling the distance L (mm) measured along the lifting movement of said strip material between said gas jet port of said edge wiping nozzle and said gas impingement point of said face wiping jet so that the relationship between said distance L and said distance C (mm) satisfies the following equation: âˆ’2.0C+20&lE;L&lE;âˆ’2.5C+45.