Skip to main content
Log in

Development of kiln drying schedule severity indices for degrade control

Part 1: Theoretical development

  • Published:
Wood Science and Technology Aims and scope Submit manuscript

Summary

Severity of kiln schedules used to dry wood has traditionally been determined after the fact. As an alternative, analytical indices using integral calculus have been developed to rate kiln schedule severity. Theoretical justification is presented for the general form of an index as well as for several specific cases. Possible uses of this type of index are also indicated. The indices take into account the dry and wet bulb temperatures used throughout a schedule as well as the duration of application and points of application of each combination of temperature and humidity used.

This is a preview of subscription content, log in via an institution to check access.

Access this article

Price excludes VAT (USA)
Tax calculation will be finalised during checkout.

Instant access to the full article PDF.

Similar content being viewed by others

References

  • Bramhall, G. 1976. Semi-empirical method to calculate kiln-schedule modifications for some lumber species. Wood Sci. 8: 213–222

    Google Scholar 

  • Comstock, G.; Kerns, J. 1971. A method for evaluating the effect of different drying methods on lumber quality. Proceedings, Twenty-second Annual Meeting, Western Dry Kiln Clubs, pp. 3–8

  • Eckelman, C. A.; Baker, J. L. 1976. Heat and air requirements in the kiln drying of wood. Purdue University Agric. Exp. Sta. Research Bull. No. 933

  • Keylwerth, R. 1950. Trocknungsgradient und Steuerung von Holztrocknern. Holz-Zbl. 76: 375

    Google Scholar 

  • Keylwerth, R.; Gaiser, H.; Meichsner, H. 1955. Untersuchungen an einer Heißdampftrockenanlage. Holz Roh- Werkstoff 13: 5–20. Canada Forest Products Laboratory Transl. No. 90, 1955

    Google Scholar 

  • Rasmussen, E. F. 1961. Dry kiln operator's manual. U.SD.A. Agric. Handbook No. 188

  • Rafalski, J. 1968. Dynamische Betrachtung des Holzfeuchtequotienten als Vergleichszahl der Intersität verschiedener Trocknungsprozesse. Holztechnologie 9 (1): 39–42

    Google Scholar 

  • Shottafer, J. E.; Schuler, C. E. 1974. Estimating heat consumption in kiln drying of lumber. Maine Agric. Exp. Sta. Tech. Bull. 73, Orono, Maine

Download references

Author information

Authors and Affiliations

Authors

Additional information

The assistance of the California Cedar Products Company, Stockton, California, and, in particular, Charles Berolzheimer and John Rhemrev, is gratefully acknowledged

The authors are, respectively, Research Associate and Project Leader, Forest Products Laboratory, University of California, Richmond

Rights and permissions

Reprints and permissions

About this article

Cite this article

Gorvad, M.R., Arganbright, D.G. Development of kiln drying schedule severity indices for degrade control. Wood Sci. Technol. 13, 137–152 (1979). https://doi.org/10.1007/BF00368606

Download citation

  • Received:

  • Issue Date:

  • DOI: https://doi.org/10.1007/BF00368606

Keywords

Navigation