Monitoring Changes in the Colour, Strength and Chemical Properties of Oil Heat Treated 18-Years Old Cultivated Acacia mangium

Acacia mangium is an important species of fast-grown timber for large-scale forest plantations in Malaysia. A research was conducted to examine changes in colour, strength and chemical properties of the 18-year-old cultivated Acacia mangium treated with oil heat. Oil heat treated in stainless tanks with palm crude oil as heating medium at temperatures of 180 ° C, 200 ° C and 220 ° C for 30, 60 and 90 minutes, respectively, were harvested trees divided into lower, middle and top portions containing heartwood and sapwood. Standards using the Minolta Chroma Meter, TAPPI Standard T204 om-88, TAPPI Standard T203 cm-99, TAPPI Standard T222 cm-02, and BS EN 310:1993 static bending tests were used to determine the changes in the wood. Using correlation analysis, the link between the changes in colour, mechanical and chemical composition was developed. The outcome showed that treatment with oil heat decreased the lightness of the wood and darkened the two sections of the wood. Following oil-heat treatment, the strength of the wood decreased significantly. The percentages of holocellulose, alpha-cellulose, hemicellulose and extractive content in chemical compositions decrease with increasing length and temperature of treatment. The method of oil heat treatment improved the colour of the sapwood to match the 18-year-old Acacia mangium heartwood. For A, the oil heat treatment process is recommended at 200 ° C for a period of 60 minutes. As it enhanced the colour of A, mangium wood. Mangium and the colour of sapwood and heartwood is standardised. As the treated wood only loses up to 15 percent strength in MOR and 10.7 percent in MOE, the loss of strength at this temperature and length is appropriate.

Author(s) Details

Razak Wahab
University College of Technology Sarawak, Malaysia.

Taharah Edin
University College of Technology Sarawak, Malaysia.

Nasihah Mokhtar
University College of Technology Sarawak, Malaysia.

Mohamad Saiful Sulaiman
University College of Technology Sarawak, Malaysia.

Ros Syazmini Mohd Ghani
University College of Technology Sarawak, Malaysia and University of Hobart, Australia.

Mohammad Haziq Razak
Universiti Sains Malaysia, Malaysia.

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