Document Type : Research Paper

Authors

• Mohammad mehdi Parhizkari ¹
• asghar tarmian ²
• Hamid Reza Taghiyari ³
• Alinaghi Karimi ⁴

¹ Msc. of wood and paper science and technology, faculty of natural resources, the university of Tehran

² Associate Proffesor

³ Assistant professor of wood and paper science and technology, faculty of civil engineering, shahid rajaee teacher training university

⁴ Professor of wood and paper science and technology, faculty of natural resources, the university of Tehran

Abstract

The longitudinal gas permeability of tension wood and normal wood of Populus nigra dried by two different drying conditions was measured. Board specimens were dried under mild conditions (50ºC, and ٪63 relative humidity) to reach ٪11.8 MC, and under severe conditions (62ºC, and ٪35 RH) to reach ٪7 MC.  After drying, dowel specimens of 14 mm in diameter and 40 mm length were prepared. Epoxy resin was applied all around each specimen to prevent fluid passing through lateral direction. Results showed that under both moisture conditions, longitudinal gas permeability values in normal wood were greater than those in tension wood. Furthermore, the permeability of both tension and normal wood decreased by increasing of drying intensity and decreasing of final moisture content. 

Keywords

• Longitudinal gas permeability
• normal wood
• Poplar
• tension wood

Main Subjects

• Biology and Wood Protection