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2 / January 2021 powderbulk.com Powder and Bulk Engineering (ISSN 0897-6627) is published monthly, twelve times per year by CSC Publishing Inc., 1155 Northland Drive, St. Paul, MN 55120. Periodicals postage paid at St. Paul, MN and additional mailing office. POSTMASTER: Send address changes to Powder and Bulk Engineering, 1155 Northland Drive, St. Paul, MN 55120. January 2021 | Volume 35 Number 1 www.powderbulk.com T H E AU T H O R I T Y S I N C E 1 9 8 7 14 Industry news 25 Markets update 27 Research notes 32 Special section: Bulk bags and equipment 62 Special section: Custom services 64 Calendar 68 Continuing education 73 What's new 74 Supplier notes 76 Product news 79 Classified advertising 79 Advertiser index DEPARTMENTS PUBLISHER'S NOTE 10 The good, the bad, and a new year Lee Hetherington MIXING AND BLENDING 36 Processing expandable polystyrene in a plow mixer Thomas Wegener and Martin Schmitz 42 Focus products 80 Suppliers' tips Suppliers discuss how to prevent an ingredient from smearing or building up during mixing GENERAL FEATURES 28 Agglomeration Advisor: Using agglomeration to prevent agglomeration Greg Mehos 48 Case history: New elbows fix pneumatic conveying lines 50 Stopping metal contamination, improving product purity, and eliminating recalls Eric J. Confer 56 Drying Desk: Drying with particle size control: A review John J. Walsh 60 EnviroPlant Industry news and information related to improving a plant's environmental operation On the cover: RV12W intensive mixer fed by a vertical lift that also functions as a hopper scale is shown next to a pelletizer with an automatic material feeder at the supplier's test center in Hardheim, Germany. Mixer provides a 400-liter capacity, efficient material processing, and process flexibility in a single unit. Mixer is used for large-scale trials for mixing, granulating, pelletizing, kneading, dissolving, and dispersing. Courtesy of Eirich Machines, Gurnee, IL, 847-336-2444 (www.eirichusa.com). 50 36