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Dry Kiln Schedules for Commercial Woods Temperate and Tropical R. Sidney Boone, Research Forest Products Technologist Forest Products Laboratory, Forest Service, Madison, WI Charles J. Kozlik, Associate Professor, Department of Forest Products Oregon State University, Corvallis, OR Paul J. Bois, Forest Products Technologist (Retired) State and Private Forestry, Forest Service, Madison, WI Eugene M. Wengert, Professor, Department of Forest Products Virginia Tech, Blacksburg, VA Introduction Purpose This publication contains suggested dry kiln schedules for most commercial woods of the world. The purpose of this publication is to make available to dry kiln operators and others interested in kiln-drying wood, kiln schedules that are completely assembled and written out for ready reference and easy use. In the majority of cases, the drying schedules are from the world literature, with emphasis on U.S., Canadian, and British publications. They are brought together in this volume for easy reference and use. Schedules for stock thicker than 8/41 (2 in or 50 mm) are given for many species. Schedules for products other than lumber, e.g. squares, handle stock, gunstock blanks, are listed when they are known and have achieved widespread acceptance in the industry. In some cases, revised schedules have been suggested, updating the information in U.S. Department of Agriculture Handbook No. 188, Dry Kiln Operator’s Manual.2 These occur mostly in the schedules for western U.S. and Canadian softwoods and the U.S. southern pines. Current thinking on high-temperature drying (temperatures exceeding 212 °F) schedules of both softwoods and hardwoods is reflected in suggested high-temperature schedules for selected species. A reasonable level of experience in kiln operation is necessary to make use of these suggested schedules, which are intended only as general guidelines. They may require fine tuning depending on the differences in kilns and with wood property variations within a species. It is also assumed that equipment is properly designed and is operated per manufacturers’ directions. For those needing a refresher in principles and operation of dry kilns, other books cover that subject well (see app. F, page 158). 2Rasmussen, E. F. 1961. Dry kiln operator’s manual. Agric. Handb. 188. Washington, DC: U.S. Department of Agriculture, Forest Service. 197 p., illus. 1It is common in some markets to designate lumber thickness by quarter inches, e.g. 4/4 = 1 inch, 6/4 = 1-1/2 inches, 8/4 = 2 Inches.PDF Image | Dry Kiln Schedules FPL GTR 57
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