Pola Pembelahan Jati Rakyat dan Sifat Fisik Serta Mekanik Kayu Gergajiannya

Teak grown on community land is usually still too young to be harvested. People harvest it at less than 30 years old for building construction. furniture and for money. The tree contains more juvenile wood and this will affect physical properties of lumber produced. The lumber will bow at longitudinal direction whenever dry. Therefore sawing pattern should be selected to minimize the effect. The research began with juvenile wood boundary determination using its shrinkage property at longitudinal direction, followed by two sawing patterns. The wood were cut into 2 and 6 cm thicknesses. Lumber straightness was identified. Mechanical properties determined were modulus of rupture. modulus of elasticity, compression parallel to grain and hardness. The results showed that juvenile wood was found up to the first 14 to 17 growth rings. Lumber of 6 cm thickness produced by people sawing pattern. i.e. parallel cutting started brain one face only, bowed significantly. The better sawing pattern that reduced bowing was cutting at the same thickness symmetrically on two opposite faces. Mechanical properties of the wood were found not significantly different from the wood taken from state forest teak stands. Keywords: teak, community land, sawing pattern, juvenile wood, physical and mechanical propertie