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PARKKEEREET, MATANN, MATANN & KYOKONG B. 2014. Flattening of half tubular bamboo culms and fixation of bamboo boards. The objective of this work was to maximise the utilisation of bamboo (Dendrocalamus asper) by overcoming constraints due to its tubular form in producing flat bamboo board. Water-saturated half tubular bamboo specimens (thickness of 3 mm and length of 150 mm) were pressed under various loads (10 to 25 N) while being immersed in hot linseed oil at different temperatures (120 to 180 °C). The height of each specimen was measured as a function of time. The flattened bamboo boards were hot pressed at 0.65 MPa at temperatures between 180 and 240 °C for up till 40 min. Springback of fixed bamboo boards in ambient air (28 °C and 75% relative humidity) and in water was assessed. The half tubular bamboo culms were best flattened in hot linseed oil under applied load of 15 N and 160 °C. Without an additional fixation at high temperature, final springback levels of 52% in ambient air and 73% in water were obser ved. These springback levels were reduced to below 5% in ambient air and 40% in water by hot pressing the flattened bamboo boards at 240 °C for at least 20 min. After fixation, the colour change of bamboo specimens was a good indicator of the springback observed.
Keywords: Dendrocalamus asper, flat bamboo board, linseed oil, springback, colour change
PARKKEEREET,MATANN,MATANN & KYOKONGB. 2014. Meleperkan buluh yang dibelah dua dan pengikatan papanbuluh.Kajian ini bertujuan untuk memaksimumkan penggunaan buluhDendrocalamus asper dengan mengatasi kekangan bentuk tiubnya untuk penghasilan papan buluh yang leper. Spesimen buluh berbelah dua (tebal 3 mm dan panjang 150 mm) yang tepu air direndam dalam minyak biji rami panas pada suhu 120 °C hingga 180 °C dan dikenakan beban antara 10 N hingga 25 N. Tinggi setiap specimen disukat mengikut masa. Papan buluh yang leper dikenakan tekanan panas pada 0.65 MPa pada suhu antara 180 °C hingga 240 °C sehingga 40 min. Anjal balik dalam udara ambien (28 °C dan 75% kelembapan relatif) dan dalam air bagi buluh yang telah diikat disukat. Kulma buluh yang dibelah dua paling baik dileperkan dalam minyak biji rami panas di bawah beban 15 N pada 160 °C. Pada suhu tinggi tanpa pengikatan...