Mini-stickies : a family of macro-stickies difficult to control, 2010 TAPPI PEERS Conference

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Recycling mills have a peculiar issue of organic deposits on paper machine clothing which create paper defects, have an adverse impact on the paper machine and lead to frequent shutdown for cleaning. The source of these deposits lies in the type of contaminants entering the process, such as adhesive material (like bookbinder, coating binder, self-adhesive labels, resins, etc…). These materials during re-sluhing give rise to small tacky particles referenced as "stickies" which are one of the biggest concern for recycling lines. A benchmarking concerning macro-stickies contamination was carried in 12 mills with the objective to establish contamination scale, to gain data regarding removal efficiencies in the different process steps having a major action on the stickies contamination (fine screening, flotation, dispersion…). On the basis of the results obtained a data base was built which enables now to compare any mill situation in term of stickies management with the data already available and consequently estimate if improvements are required.