Some Mechanical Properties of Small Specimens Cut from 1.79-inch-thick Southern Pine Dried for 6 Hours at 300 F or for 5 Days at 180 F-A Comparison
Keywords:
<i>Pinus taeda</i>, <i>Pinus palustris</i>, southern pine, high temperature drying, kiln schedules, modulus of elasticity, modulus of rupture, toughness, hardness, moisture contentAbstract
Small specimens cut from 1.79-inch-thick southern pine dried from green condition for 6 hours at a dry-bulb temperature of 300 F suffered no diminution in the mechanical properties determined, when compared to matched wood dried for 5 days at 180 F. Properties were as follows:
Dried 5 days at 180 F Dried 6 hours at 300 F
Modulus of elasticity (psi) 1,580,000 1,740,000
Modulus of rupture (psi) 12,980 15,390
Proportional limit (psi) 5,210 5,800
Toughness (inch pounds) 234 252
Face hardness (pounds) 822 888
End hardness (pounds) 941 1,129
Moisture content of the 300-degree wood at test (about 9%) averaged nearly two percentage points less than that of the 180-degree wood after equilibration.
References
Koch, P. 1971. Process for straightening and drying southern pine 2 by 4's in 24 hours. For. Prod. J.21(5): 17-24.nKoch, P., and W. L. Wellford, Jr. 1977. Continuous tunnel kiln direct-fired with bark to dry 1.75-inch-thick southern pine in 12 hours. For. Prod. J.27(5): 39-47.nThompson, W. S., and R. S. Stevens. 1976. Influence of thermal treatments on the mechanical and chemical properties of wood: a review of research at the Mississippi Forest Products Laboratory, Pages 81-100 in Proc., Res. Conf. on: high-temperature drying effects on mechanical properties of softwood lumber. Forest Service-USDA, For. Prod. Lab., Madison, Wis.n
Downloads
Published
Issue
Section
License
The copyright of an article published in Wood and Fiber Science is transferred to the Society of Wood Science and Technology (for U. S. Government employees: to the extent transferable), effective if and when the article is accepted for publication. This transfer grants the Society of Wood Science and Technology permission to republish all or any part of the article in any form, e.g., reprints for sale, microfiche, proceedings, etc. However, the authors reserve the following as set forth in the Copyright Law:
1. All proprietary rights other than copyright, such as patent rights.
2. The right to grant or refuse permission to third parties to republish all or part of the article or translations thereof. In the case of whole articles, such third parties must obtain Society of Wood Science and Technology written permission as well. However, the Society may grant rights with respect to Journal issues as a whole.
3. The right to use all or part of this article in future works of their own, such as lectures, press releases, reviews, text books, or reprint books.
