Coating processes – Pretreatment – per se – or post-treatment – per se
Reexamination Certificate
2008-01-10
2009-10-20
Cleveland, Michael (Department: 1792)
Coating processes
Pretreatment, per se, or post-treatment, per se
C118S699000
Reexamination Certificate
active
07604844
ABSTRACT:
A method is disclosed for scraping a roll surface rotating in a molten metal coating process comprising traversing a support assembly to one side, lifting the arms attached to said the assembly to a fully retracted position to disengage scraper blades from contact with a roll surface; initiating a scrape cycle by means of a trigger signal; lowering the arms and scraper blades in the mid-point of the sink roll; increasing the pressure reference from lifting pressure to approximately zero; energizing one or more directional valves; increasing the pressure value gradually to a preselected pressure; extending the cylinder in a controlled manner to engage the scraper head gently on to the sink roll; moving the engaged scraping head at controlled, predetermined speed from the sink roll mid point to the fully traversed out position; stopping the traversing means upon reaching the fully traversed out portion; and lifting the scraper head from the roll surface by removing pressure from the cylinder; then repeating the sequence until a predetermined number of cycles are completed.
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Brooks Scott E.
Hickman Michael D.
Piper James M.
Sapp Erin G.
Cleveland Michael
Empie Nathan H
McNees Wallace & Nurick LLC
United States Steel Corporation
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