B - Operations – Transporting – 05 – C
Patent
B - Operations, Transporting
05
C
117/108, 32/28,
B05C 11/06 (2006.01) B05C 11/10 (2006.01) C23C 2/18 (2006.01) G05D 5/03 (2006.01)
Patent
CA 1063798
ABSTRACT OF THE DISCLOSURE This invention relates to a method and apparatus for coating a substrate and, in particular, to a system for automatically controlling the average, minimum, end distribution of coating thickness of material produced in a continuous-coating process. The application discussed is a continous-galvanizing line. However, the system can generally be applied to any continuous-coating process with actuators that control the coating thickness and a gauge that measures the coating thickness. The system provides a means of maintaining a given average coating weight over the width of the sheet while ensuring that a given minimum-coating weight over a spot less than the width of the sheet will also be met. The system also provides a means for periodic logging of process data such as these average- and minimum-coating weights. To do this a digital computer is connected to various sensors and devices on a strip line including a gauge for measuring the thickness of the coating. Typically, the computer may be a Westinghouse model P2500 digital process- control computer, and the gauge may be a Nucleonic Data Systems Model 200 zinc-coating gauge. This zinc-coating gauge uses X-ray type emissions from a radioactive isotope (Americium 241) to measure the zinc thickness on the galvanized product. Two gauge heads (top and bottom) give independent measurements of the coating on each side of the strip. The gauge heads are mounted approximately 230 feet (70 m) downstream from the air knives on the first down pass of the cooling tower.
232309
Readal Gerald J.
Tiskus John R.
Tomcanin William J.
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