Pengaruh Ukuran Partikel dan Penggunaan Waterglass terhadap Kualitas Papan Partikel dari Bagase Sorghum

Abstract

DITA SARI PRABUNINGRUM : Effect of Particle Length Size and Water Glass Post-Treatment on Quality of Particleboard Made From Sorghum Bagasse. Under supervised IRAWATI AZHAR and APRI HERI ISWANTO In the previous research, the problem of particleboard made from sorghum bagasse with Urea Formaldehyde resin were low value in dimensional stability,modulus of elasticity (MOE) and internal bond (IB). This research will give the solution to overcome of that problems. The objective of this research were to (1) evaluate the effect of length size particle on physical and mechanical properties of particleboard. (2) Evaluate water glass post-treatment on particleboard properties. The first research: Sorghum bagasse was cutted into 3, 5, and 7 cm length size. Furthermore, the particles were dried until approximately of 4% moisture content. Amount of 10% UF resin used for binding. Hot pressing process was conducted in 1300C temperature for 10 minute and 30 kg cm-2 pressure. For water glass post-treatment, 3 cm particle was used in this research. The manufacturing process of particleboard was similar with the first research. Board sample was immersed in waterglass on several concentration 0%, 30%, 50%, 70%, and 100% for 10 minute. Therefore, sample were oven dried at 800C for 24 hours. The result showed that, for the first research: the thickness swelling (TS) and internal bond (IB) did not fulfill of requirement JIS A 5908 (2003). According to all the test parameter, 3 cm length size of particle were resulting of the best properties compared with 5 and 7 cm length size. For the second research: WG post- treatment able to reduce of thickness swelling almost 30%. However, the thickness swelling did not fulfilled yet of standard. The mechanical properties showed that negative trend in MOR, MOE and IB parameter. Waterglass post-treatment and drying after treatment were suspected as the one factor in reducing of mechanical properties.