Online Analysis of Macrostickies in a Sorted Office Waste Recycling Plant Making Tissue, 2012 TAPPI PEERS Conference

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The FPAutoSpeck™ was used to measure over eight thousand online measurements of deinked pulp (DIP) for the number and area of heavy stickies, light macrocontaminants and dirt. The analyzer detected a wide range of macrocontaminant levels during which the three types of macrocontaminants varied independently of the other. “Stickies storm” levels were detected and visualized by the analyzer with heavy stickies levels exceeding 17,000 #/kg in the final pulp. Different particle size distribution patterns were noted for the light macrocontaminants when compared to those obtained for heavy stickies and dirt. Mill surveys of the fine screens and flotation cell showed different removal efficiencies for heavy stickies and light macrocontaminant. Fine screening was slightly more efficient in the removal of heavy stickies when compared to light macrocontaminants. Fine screens were more efficient at removing heavy stickies at particle sizes greater than 400 µm whereas flotation removed 57% of the heavy stickies between 200 – 300 µm. Flotation was able to remove 69 – 86% of the light macrocontaminants independent of their particle size.