How Can Measuring Colloidal Organic Variability Improve Paper Machine Runnability?, PaperCon '09 Conference

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With the development of the IPST detection method based on fractionation and measurement of Total Organic Carbon (TOC) for colloidal organics it is possible to make on-line measurements with updates about every 5 minutes and a full set of tests every 30 minutes. Validation efforts have shown that over 80% of the deposit/hole events can be related to the variability in the total organic carbon values. What appears to be a frustrating series of breaks can be seen to be relate to the variability of colloidal organics in the process. For many paper machines, runnability with respect to deposits is based on a daily hole count, daily number of breaks due to deposits, or total amount of downtime due to deposits. With frequent sampling, emphasis can be shifted from daily summaries of runnability to individual breaks in relation to changes in the concentration of colloidal organics. By monitoring this variability the paper machine operators have the opportunity to reduce or control those events. The principal objective of this work is to demonstrate the importance of monitoring colloidal variability and how it can be used to manage and control deposit related runnability issues by reducing colloidal variability.