The TAPPI Papermaking Additives Committee continues its  quarterly webinar series, ‘Fill your Wet End Chemistry Toolbox to Improve Your Productivity, Stability, and Efficiency' with the third installment, Extractives Control, on Thursday September 24 at noon EST. This series was designed to dive deeper into the science and technology of wet end chemistry and expand on topics covered in the annual Wet End Chemistry course. The series is hosted by Dr. Przemyslaw Pruszynski of Nalco, an Ecolab Company. Registration for this webinar is now available online. 

 

Extractives Control will discuss how paper machine deposition problems related to natural pitch, stickies, and coated broke synthetic binders, significantly affect paper machine efficiency and product quality. The source of the troublesome character of these materials results from their hydrophobic character and inability to fit into the water structure. These materials are collectively known as extractives or hydrophobic contaminants. We will cover hydrophobic contaminants jointly based on the common principle of their impact on paper machine operations – instability in water phase, natural tendency to agglomerate, and deposition to surfaces of paper machine equipment.

 

We will also discuss chemistry and morphology of extractives with special emphasis on natural pitch, factors affecting stability of colloidal fraction of extractives, conditions (shocks) that trigger agglomeration, importance of early agglomeration, and undesired interactions between different classes of extractives. Finally, we will discuss designing a logical and science-based extractives control program based on a combination of fixation and detackification strategies. This will include discussion of how to perform effective fixation without competing agglomeration process, selection of chemical program, and dosage points.

 

Presenter Dr. Przemyslaw Pruszynski is one of the foremost experts in wet end chemistry and currently serves as global technical specialist in paper chemistry with Nalco, an Ecolab Company. Przem received his MSc and PhD from the University of Poznan, Poland, in the area of physical organic chemistry where he taught for 12 years. After moving to Canada, he continued his research and teaching at Dalhousie University in Halifax, NS, and University of Toronto. The industrial part of his career started at Dow Chemical Research in the Forest Products Group. He joined Nalco in 1992 and has spent the past 23 years occupying various technical positions.

 

Przem is the author and coauthor of close to 100 papers and conference contributions. He is also a frequent instructor at PAPTAC and TAPPI professional courses. Przem is a recipient of the Jasper Mardon Memorial Prize for contribution to science and technology of papermaking. His areas of expertise include water chemistry, wet-end chemistry, papermaking chemistry, mechanical pulping and bleaching, papermaking, and paper properties. 

 

Recordings of previous sessions in the series, which included Fundamentals and Retention Programs, are available to TAPPI members as part of the TAPPI Webinar Series. Upcoming topics include Stability & Potential Incompatibilities.

 

The papermaking additives committee is an active part of the Paper and Board Division. More information about this or other TAPPI committees is available online.