IMPROVING RUNNABILITY OF PULP DRYING MACHINES, 18PaperCon

To improve the cost-competitiveness, most North American market pulp producers have been gradually increasing the production capacity to the extent that their pulp drying machines are operating beyond their design capacity. This increase has been achieved by producing higher basis weight and by maximizing the speed. At the same time, the pulp mills have made modifications in pulping and bleaching operation to produce market pulps for new applications (e.g. tissue, or fluff pulp), creating change in pulp drainage. As a result, runnability issues such as web breaks in the open draw have become increasingly an issue, causing significant production losses and machine downtime.  In this paper, we review best practices for maintaining and improving the pulp drying machine runnability and diagnostic methods to help identify the root causes of the runnability problems. We also present few case studies to highlight some factors that cause web wet-strength loss at the open-draw, including poor drainage, poor moisture profile and also sheet consolidation problems. We will show how pulp machine runnability could be improved without significant capital investment and/or change in pulp machine operation. 

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