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2 / September 2020 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. September 2020 | Volume 34 Number 9 www.powderbulk.com T H E AU T H O R I T Y S I N C E 1 9 8 7 INDUSTRY PERSPECTIVE 6 Working remotely has limitations Schuyler K. Marsh WEIGHING AND BATCHING 22 Optimizing scale accuracy for automated ingredient weighing and batching applications Terry Stemler 30 Solids weighing and batching overview — Part I Todd Smith 34 Focus products 56 Suppliers' tips Suppliers discuss factors in a plant that can affect load cell and scale accuracy. GENERAL FEATURES 18 Mixing Mechanics: Keys to mixer testing James L. Davis 38 Test center: Accurately and efficiently screening rubber 44 Drying Desk: Fluid-bed dryer basics John J. Walsh 38 22 50 On the cover: Model LWF-SC-V loss-in-weight vibratory feed- er is shown at the supplier's material test center in Pembroke, MA. Loss-in-weight unit features a Spiraltor vertical lifting agi- tator, which provides consistent metering of difficult-to-handle materials, from free-flowing to friable to interlocking; an auto- matic test-weight lifter, which provides hands-free calibration; a scale capacity from 30 to 500 pounds; and a flowrate range from 0.33 to 1.06 cfm. Courtesy of Thayer Scale, Pembroke, MA, 855-784-2937 (www.thayerscale.com). 8 Correction 8 Industry news 16 Markets update 17 Research notes 21 Special section: Particle analysis 40 Special section: Flow aids 46 Calendar 47 Continuing education 50 Advertiser index 50 What's new 51 Supplier notes 52 People news 53 Product news 55 Classified advertising DEPARTMENTS