Ảnh hưởng của nhiệt độ và thời gian biến tính nhiệt đến khối lượng thể tích và màu sắc của gỗ Thông ba lá (Pinus kesiya) và gỗ Bạch tùng (Dacrycarpus imbricatus)

The Pinus kesiya and Podocarp (Dacrycarpus imbricatus) woods

were obtained from the plantations of the Southeast region of

Vietnam, with the initial humidity of 80 - 85%. The wood was cut

into boards with dimensions of 40 x 80 mm to 120 x 500 mm. In

this study, the Pinus kesiya and Podocarp woods were thermally

treated at with high temperatures ranging from 161oC to 218oC

and the duration from 7.5 h to 13 h. The experiment results

showed that the oven-dry density of pine and Bach tung tended

to decrease when it was treated at high temperatures during long

periods of time. In particular, the density of Pinus kesiya and

Podocarp woods decreased about 3.17 - 17.3% and 3.45 - 20.73%,

respectively, compared with the control samples. In the thermal

modification process, under the effects of high temperature Pinus

kesiya and Podocarp woods became darker than the modified

wood.