Oriented strandboard from small-diameter southern pine trees

Han Guangping, . and Wu Qinglin, . (2006) Oriented strandboard from small-diameter southern pine trees. [Proceedings Paper]

Thermal and mechanical properties of southern pine and willow strands and selected properties of southern pine oriented strandboard OSB from small-diameter logs were investigated in this study. The effect of density and species group on tensile strength dynamic moduli and thermal stability of wood strands and of strand quality i.e wood fines on three layer OSB properties were analyzed. Strand tensile strength and dynamic storage moduli E increased with the increased of strand density. A large variation in both tensile strength and E values was observed for southern pine while willow strands showed much smaller variability. The dynamic moduli E of strands decreased with increase of temperature in the range of 25 to 200c. Small loss module E peaks were observed over the temperature range studied. The strands with higher densities had higher E. Thermogravimetric analysis TGA results revealed high-density strands were thermally more stable than low density strands. The three-layer OSB made of small diameter southern pine trees showed satisfactory strength and dimensional stability properties. As the fines loading levels increased linear expansion LE along the parallel direction decreased while the LE value along the perpendicular direction and thickness swelling increased. With increased fines levels the internal bond strength showed an increasing trend and bending strength and modulus varied little in the parallel direction and slighty decreased in the perpendicular direction.

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Abstract

Thermal and mechanical properties of southern pine and willow strands and selected properties of southern pine oriented strandboard OSB from small-diameter logs were investigated in this study. The effect of density and species group on tensile strength dynamic moduli and thermal stability of wood strands and of strand quality i.e wood fines on three layer OSB properties were analyzed. Strand tensile strength and dynamic storage moduli E increased with the increased of strand density. A large variation in both tensile strength and E values was observed for southern pine while willow strands showed much smaller variability. The dynamic moduli E of strands decreased with increase of temperature in the range of 25 to 200c. Small loss module E peaks were observed over the temperature range studied. The strands with higher densities had higher E. Thermogravimetric analysis TGA results revealed high-density strands were thermally more stable than low density strands. The three-layer OSB made of small diameter southern pine trees showed satisfactory strength and dimensional stability properties. As the fines loading levels increased linear expansion LE along the parallel direction decreased while the LE value along the perpendicular direction and thickness swelling increased. With increased fines levels the internal bond strength showed an increasing trend and bending strength and modulus varied little in the parallel direction and slighty decreased in the perpendicular direction.

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Item Type:	Proceedings Paper
AGROVOC Term:	PINUS
AGROVOC Term:	DIAMETER
AGROVOC Term:	THERMAL PROPERTIES
AGROVOC Term:	STRENGTH
AGROVOC Term:	GRAVIMETRY
AGROVOC Term:	DENSITY
AGROVOC Term:	SOUTHERN STATES USA
Geographical Term:	MALAYSIA
Depositing User:	Ms. Norfaezah Khomsan
Last Modified:	24 Apr 2025 05:28
URI:	http://webagris.upm.edu.my/id/eprint/16874

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