The Prevention of CP-Tube from Contamination by Application of the Laser Sensor

Abstract

The direct dilution method in the head box combined with the consistency profiling equipment has been introduced recently in order to improve the CD profile. There are 30 to 150 pieces of narrow tubes in the CP equipment. Deposits caused mainly by microorganisms, including bacteria, fungi and yeast which collect inside of these tubes, which proliferate, and then fall off the tubes when the deposit grows up to a certain size causes peculiar problems to the CP equipment such as speckles and breaks. As a kind of deposit control agent, slime control chemicals have been dosed into the first white water circulating lines. White water is circulated and concentrated haevily in the line, and the concentration of slime control chemicals are maintained. But white water in the CP line isn't circulated, so the countermeasure for the deposit problem becomes critical. Therefore we have developed a monitoring system for the CP. We then screen for the optimum slime control chemical. Using this data we have established the optimum dosing method and as a result, we now can control deposit problems.