Iswanto, Apri H
Jurnal Ilmu dan Teknologi Kayu Tropis

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Resin Duct Anatomical Structure of High Resin Yielder Pinus merkusii Susilowati, Arida; Wahyudi, Imam; Supriyanto, Supriyanto; Siregar, Iskandar Z; Corryanti, Corryanti; Iswanto, Apri H
Jurnal Ilmu dan Teknologi Kayu Tropis Vol 11, No 2 (2013): Jurnal Ilmu dan Teknologi Kayu Tropis
Publisher : Jurnal Ilmu dan Teknologi Kayu Tropis

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Abstract

The objective of this research was to characterize resin duct anatomical structure of high resin yielder pine (Pinus merkusii) that influences resin production. Samples were collected from high resin yielder pine with different resin production class from seedling seed orchard Cijambu, Sumedang and normal trees from Bogor. Samples than evaluated through microscopic and macroscopic observation to get information about some parameter related to resin duct. The result on anatomical structure characterization showed that high resin yielder trees compared to that of normal one are as followed: darker in wood colour (reddish brown compared to creamy white), higher in number of axial resin duct (9.401.68 mm-2 to 101.30 mm-2 compared to 40.96 mm-2), wider in resin duct diameter (468.8998.72 μm to 562.11181.62 μm compared to 109.4211.26 μm), thicker in epithelium cell (50.81 12.20 μm to 58.599.55 μm compared to 23.1787 μm). These differences may affect to quantity of resin yielder compared to normal producer.Key words: anatomical structure, epithelium, high resin yielder, Pinus merkusii, resin duct
Physical and Mechanical Properties of Particleboard Made from Jatropha (Jatropha curcas) Fruit Hulls Reinforced with Wood Particle Iswanto, Apri H; Febrianto, Fauzi; Hadi, Yusuf Sudo; Ruhendi, Surdiding; Hermawan, Dede
Jurnal Ilmu dan Teknologi Kayu Tropis Vol 10, No 2 (2012): Jurnal Ilmu dan Teknologi Kayu Tropis
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The objective of this research was to evaluate the properties of particleboard made from mixtures of jatropha fruit hulls (JFH) and wood particle in several mixture ratios. JFH, and mangium wood (Acacia mangium Wild) particle were untreated and treated with 1% acetic acid solution for 24 h. Urea formaldehyde (UF) resin with 10% resin content (SC: 63%) was used as binder. The ratio of JFH and wood particles were set at 100:0, 70:30, 60:40, 50:50, and 0:100. The target density of particleboard was set at 0.70 g cm-3. The temperature and pressure of hot pressing were set at 130 ºC and 2.544 N mm-2 for 10 minutes. The physical and mechanical properties of particleboard were evaluated according to JIS A 5908-2003 standard. The result indicated that addition of untreated mangium wood particle onto JFH particles improved mechanical properties of board especially modulus of elasticity (MOE) and modulus of rupture (MOR) parameters. However, the internal bond (IB) parameter was found to decrease with addition of wood particle. The higher amount of wood particle added resulted in the better the MOR and MOE parameters. Addition of acetic acid treated mangium wood particle onto JFH particleboard resulted in lower physical and mechanical properties.Key words: Jatropha curcas, fruit hulls, particleboard, wood particle
Physical and Mechanical Properties of Oriented Strand Board Prepared from Acetylated Wood Strands Iswanto, Apri H; Fatriasari, Widya; Yunianti, Andi D; Zailani, Ahmad; Febrianto, Fauzi
Jurnal Ilmu dan Teknologi Kayu Tropis Vol 11, No 2 (2013): Jurnal Ilmu dan Teknologi Kayu Tropis
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The objectives of this research were to evaluate of the physical and mechanical properties of oriented strand board (OSB) prepared from acetylated wood strands. Strands derived from Acacia mangium wood were immersed in acetic anhydride for 24 h. After that, strands were dried at 60 C to reach moisture content (MC) of 5%. The slenderness and aspect ratios of strands were 100.72±39.42 and 3.05 ± 0.44. Boards size and target density were set at (25x25x0.5) cm3 and 0.7 g cm-3. The strand compositions for face, core, and back layers were 25, 50, and 25%, respectively. Phenol formaldehyde (PF) resin with amount of 8% was used to bind the strands. The results showed that weight percent gain (WPG) of acetylated strands was 4%. Acetylated strands resulted in improvement of dimensional stabilization (water absorption (WA) and thickness swelling (TS) parameters) with anti-shrink efficiency (ASE) value of 19.65%. On the other hand, the modulus of elasticity (MOE), modulus of rupture (MOR) and internal bond (IB) were found to decrease with acetylation treatment. All the physical and mechanical properties of OSB evaluated except IB parameter fulfilled the requirements of JIS A 5908-2003 standard.Key words: acetylated, anti-shrink efficiency, dimensional stability, oriented strand board
Pengaruh Kombinasi Bambu terhadap Kualitas Oriented Strand Board (Effect of bamboo combination on the quality of Oriented Strand Board) Purba, Adiaman RI; Iswanto, Apri H; Azhar, Irawati
Jurnal Ilmu dan Teknologi Kayu Tropis Vol 14, No 1 (2016): Jurnal Ilmu dan Teknologi Kayu Tropis
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Bamboo is a potential alternative material for wood based OSB. Evaluation of physical and mechanical properties of OSB from combined bamboo betung and bamboo tali was emphasized in the present research. Betung and tali bamboo were converted into strands with the length x width x thickness size of 7 cm x 2.5cm x 0.1cm, respectively. Strand were oven dried up to 7% of moisture content. Upon drying, strands wereblended with 5% isocyanat resin. After mat forming, furnish was pressed by hot press machine at 160 oC temperature for 5 minute and 30 kgcm-2 pressure. The prepared OSB was conditioned for 7 days at room temperature. The results showed that bamboo combination increased the physical and mechanical  properties of board. T/TB/T was the best combination in this experiment. OSB properties improved when betung bamboo was applied on the surface. Overall, the properties of board satisfied the requirement of  JIS A 5908 (2003) standard.Key word: betung bamboo, tali bamboo, isocyanate, OSB
Effect of Wood Species and Layer Structure on Physical and Mechanical Properties of Strand Board Hidayat, wahyu; Sya'bani, Mohamad I; Purwawangsa, Handian; Iswanto, Apri H; Febrianto, Fauzi
Jurnal Ilmu dan Teknologi Kayu Tropis Vol 9, No 2 (2011): Jurnal Ilmu dan Teknologi Kayu Tropis
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Abstract

The objectives of this research were to evaluate the effect of wood species and layer structure on physical and mechanical properties of strand board made from Paraserianthes falcataria, Maesopsis eminii and Acacia mangium woods collected from planted forest in Bogor district, Indonesia. The densities of P. falcataria, M. eminii and A. mangium woods were 0.36, 0.41 and 0.46 g cm-3, respectively. Three types of layer structures namely perpendicular, parallel, and random orientation were applied. Methylene diisocyanate (MDI) resin with 7% resin amount (w/w) was used. The physical and mechanical properties of strand board were evaluated based on CSA 0437.0 standard. The results indicated that strand board manufactured from wood with lower density (P. falcataria) had higher mechanical properties (modulus of rupture, modulus of elasticity and internal bond) and lower dimensional stability (water absorption and thickness swelling) compared to strand board manufactured from higher density (A. mangium), vice versa. Strand orientation strongly affected the physical and mechanical properties of board with perpendicular orientation showed superior performance as compared to parallel and random orientation. Physical and mechanical properties of oriented strand board (OSB) made from fast growing tree species met the requirement of CSA 0437.0 standard for grade O-1 OSB panels.Key words: layer structure, methylene diisocyanate resin, strand board, tropical wood species,