UV measurement is now a standard part of Metso's inline brightness sensors to optimize chemical costs at DIP/RCF plants. The previous two inline brightness sensor models, Cormec5 and Cormec5 X, with different measurement capabilities will merge and become one. The new inline sensor with an enhanced measurement capability will carry the name Cormec5 X. In addition to brightness and UV+ brightness, it also measures other important optical pulp properties, such as residual ink and color.
Cormec5 X with its UV measurement has been well received by European DIP/RCF plants. Fluorescence and UV+ brightness values are typically used for measuring the quantity of the optical brightening agent (OBA) in the incoming raw material and for OBA dosage control in stock preparation. As OBAs are fairly expensive and can be harmful to health, mills have been able to optimize their chemical costs with continuous inline measurement information while achieving set quality targets. In addition, the mills have been able to ensure that specific grades, such as tissue and hygienic papers, do not hold any chemical residues.
The UV-based measurement can be used together with the industry standard brightness, effective residual ink content (ERIC) and CIELAB color measurements to achieve full benefit from a single-point inline measurement. Based on experiences at paper mills, Metso Cormec5 X has also proven its capabilities in paper machine approach systems when controlling OBA and color dosage during web breaks and process startups when measurement results from a scanner are not available. During a normal run, it provides fast feedback for paper machine quality controls together with traditional scanner measurements.