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Eco-Friendly Machines for Enhancing Durability and Colour Appearance of Wood
tm3283213803
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The eco-friendly machines were designed for enhancing durability and improving the colour appearance of wood especially those from the planted species. The process also increases the wood dimensional stability. The process make used of a stainless steel tank with oil palm as the heating medium. The heat were generated by an electrical current. The temperature and treatment duration were monitored by a control panel placed outside the tank. Depending on the wood species and condition (mature and immature), the temperature applied were 1400C, 1800C and 2200C with exposure duration of 1, 2 and 3 hours respectively. The results of the investigations show that the heat treated wood retained most of their original physical and strength properties after undergoing the heat treatment. The colour especially the sap wood improved tremendously. The wood can be dried to an MC of 6-7% within 2 to 3 hours of treatment. The basic densities of bamboo were found to improve slightly by the heat application. The overall strengths properties of the heat treated bamboo were found to decrease slightly. The modulus of elasticity in the bending strengths were reduced between 2-33% in the green and 6-9% in the air-dried conditions. For the modulus of rupture in the bending strengths, the value were reduced between 1-23% in green and 4-16% in air-dried conditions. The compression strengths were reduced in the ranged between 2-3% ingreen and 2-35% in air-dried conditions. The shear strengths were reduced in the ranged between 16-24% and 12-24% in green and air-dried conditions respectively. The cultivated wood of Tectona grandlis, Acacia hybrid and Neolamarckia cadamba were used in this study. Within a week after harvesting, the wood were sawn and cut into various sizes, dried to 14% MC and underwent the heat treatment process, and for the subsequent investigations. Two sets of samples were investigated. The first set consist sap wood and second set consisted of heart wood. The heat treatment on the bamboo were done using an electrical heat treatment machine which was made as a prototype model. Palm oil was used as the heating medium as it is organic in nature, readily available and has high boiling point. The palm oil was first heated up to a temperature of 800C. Then the wood samples were submerged in the heated oil by placing them in a metal cage. The samples were taken out at 1400C, 1800C and 2200C interval after 30, 60 and 90 min. of immersion. A control panel was used in controlling the temperature and the duration of the process. A procedure developed by Razak et al. was adopted in this study with modification to suit for bamboo. All tests on the physical, mechanical & durability studies on these samples were conducted in accordance with ASTM, ISO & EN standards.

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Faculty of Earth Science, Universiti Malaysia Kelantan, Karung Berkunci 36
16100 Pengkalan Chepa
Kelantan
Malaysia

Full Name [1]
Razak Wahab
Email [1]
razak@umk.edu.my