1993 Volume 79 Issue 7 Pages 765-771
In order to measure the emissivity of cold strip in the furnace of Continuous Annealing Line (herein "CAL"), an approach using the temperature measuring roll and radiation pyrometer has been applied at the Chiba works. The temperature measuring roll is a hearth roll in which some thermocouples are installed. The thermocouples are buried inside surface of the hearth roll. The signals of roll temperature are taken out via slip rings which are equipped at the end of the roll axle. There is very small temperature gradient across the roll shell on which the strip contacts, and the heat flux in the transverse direction is also small. Therefore, at the portion enough inside from the strip edge, the roll temperature can be equal to the strip temperature. The emissivity can be calculated from the measured values of the temperature measuring roll and the radiation pyrometer which are equipped same position. The temperature measuring roll has been used since the CAL operation started and the emissivities of various grades of strips have already evaluated.
