Patent ID: 7604844
Filing Date: 2009-10-20
Classification: C23C

Abstract:
1. A method for scraping a roll surface of a sink roll rotating in a molten metal coating process comprising: a) traversing a support assembly to one side of a sink roll, the support assembly comprising a first arm having a first pair of scraper blades and a second arm having a second pair of scraper blades, wherein the first arm and second arm are independently operable to extend and retract; b) lifting the first arm and the second arm to a fully retracted position, thereby disengaging the first and second pairs of scraper blades from contact with the roll surface; c) lowering the first arm and the first pair of scraper blades from above the approximate mid-point of the sink roll, into contact with the sink roll surface; d) extending the first arm to engage the first pair of scraper blades in contact with the sink roll; e) moving the first arm at a predetermined speed from the sink roll approximate mid point to a fully traversed position, while the second arm moves from a point above a first end of the sink roll to a point above the sink roll approximate mid point; f) stopping the traversing means upon reaching the fully traversed out position; and g) lifting the first pair of scraper blades from the roll surface and extending the second arm to engage the second pair of scraper blades in contact with the sink roll; and h) moving the second arm at a predetermined speed from the sink roll approximate mid point to a fully traversed position, while the first arm moves from a point above a second end of the sink roll to a point above the sink roll approximate mid point.