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Measurement and control of optical brighteners using inline sensor technology

Kunschert K., Ziegler H., Leyerer H.

Przegląd Papierniczy

2011

R. 67, nr 9

569-572

The appearance of graphical paper is determined by its brightness and color which is adjusted by optical brightening agents (OBAs) and dyes. This addition of OBAs and dyes is commonly controlled and monitored according to the scanner values of the pope roller. This common practice has many flaws including the delay between dosage of the additives and the actual measurement, the danger of overdosage when a change in furnish occurs as well as the fact that during a sheet break there is no value which the dosage can be related to as the last measured value does not reflect the reality of the process. In the scope of a diploma thesis it could be demonstrated how, with help of the inline sensor BT-5400 UV, OBA and dye can be measured and controlled. In a practical example the sensor was installed after the deculator of a fine paper machine. The OBA and two dyes were dosed directly into the pulp suspension as well as a further OBA dosage in the size press. The time between dosage, inline measurement and pope measurement amounts to less than 10 minutes. This allows for a control loop with fast reaction. The real-time measurement of OBA and color allows a reduction of broke production, faster grade changes, avoidance of over- or underdosing and close control during web breaks where scanner values are not available. The installation of the inline sensor BT-5400 UV in combination with a control loop enables a fast amortization of the investment and an increase in productivity and paper quality.