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Title: Estimating air-drying times of small-diameter ponderosa pine and Douglas-fir logs

Source: Forest products journal. Vol. 54, no. 12 (Dec. 2004): Pages 24-28

Author(s)Simpson, William T.; Wang, Xiping

Publication Year: 2004  View PDF »

Category: Journal Articles

Abstract: One potential use for small-diameter ponderosa pine and Douglas-fir timber is in log form. Many potential uses of logs require some degree of drying. Even though these small diameters may be considered small in the forestry context, their size when compared to typical lumber thickness dimensions is large. These logs, however, may require uneconomically long kiln-drying time. Air-drying is a logical alternative to kiln drying, but the variables involved make estimating air-drying times difficult. In this study, experimental air-drying time data for 4- to 8-inch- (102- to 203-mm-) diameter ponderosa pine and Douglas-fir debarked logs stacked for air-drying at four different times of the year were developed. These data were used to develop multiple linear and nonlinear regression models that relate daily moisture content (MC) loss to MCat the start of the day, average daily temperature and relative humidity, and log diameter. The model provides a way to calculate estimated air-drying times for logs stacked at any time of the year where historic weather data are available.

Keywords: Air drying, drying times, small diameter, ponderosa pine, Douglas fir

File size: 109 kb(s)

This publication is also viewable on Treesearch:  view
RITS Product ID: 12577
Current FPL Scientist associated with this product
Wang, Xiping
Research Forest Products Technologist
  

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