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Sri Nugroho Marsoem,Fajar Setiaji,Nam Hum Kim,Joko Sulistyo,Denny Irawati,Widyanto Dwi Nugroho,Yus Andini Bekti Pertiwi 한국목재공학회 2015 목재공학 Vol.43 No.2
Fiber morphology and basic characteristics of Legi bamboos (Gigantochloa atter) growing on Yogyakarta were studied considering their age and height positions in the culms. Culms of 4, 16, and 40 months were harvested, and their total lengths were measured. The length, diameter, and wall thickness of each internode were measured. All the sample culms were divided into three different parts along the height, and their fiber dimension and physical properties were observed. The data obtained were analyzed by analysis of variance. The results showed that the culms had a diameter of 5.8 to 10.8 cm. The lowest internodes always showed the shortest length and the thickest wall. The culms had an average fiber length of 2.41 mm and Runkel ratio of 0.61. Fiber length was affected by the height, while fiber diameter, lumen diameter, and fiber wall thickness were affected significantly by the age of the culms. The culms had high green moisture content (GMC) of 157.89%, and basic density (BD) of 456.67 kg.m -3 , a total longitudinal shrinkage of 0.35%, and relatively low R/T shrinkage ratio. The interactions between age and height were affected GMC and BD.
( Joko Sulistyo ),( Sri Nugroho Marsoem ),( Tomy Listyanto ),( Nam Hum Kim ) 한국목재공학회 2018 한국목재공학회 학술발표논문집 Vol.2018 No.1
The fire-retardancy and thermal degradation of inferior tropical timber, i.e. sengon (Paraserianthes mollucana), overlaid with charcoal composite made from three wood species i.e. asam (Tamarindus indica), rambutan (Naphelium lappaceum) and melinjo (Gnetum gnemon) were studied under fire test. Borax 0%, 3% and 5% of charcoal dry weight were added into charcoal composite. The fire-retardancy of overlaid charcoal composite in fire test was affected by an interaction of charcoal wood species and the percentage of additional borax. The optimal fire-retardancy properties were shown by sengon timber overlaid with 5% borax added charcoal composite from Asam.
Anatomical Characteristics and Air-dry Density of Young Trees of Teak Clones Planted in Indonesia
Fanny Hidayati,Futoshi Ishiguri,Sri Nugroho Marsoem 한국목재공학회 2017 목재공학 Vol.45 No.4
The objectives of this study are to obtain the basic knowledge of anatomical characteristics and wood proper-ties of thinning trees of young teak (Tectona grandis L.F.) for fulfill the timber demand in Indonesia. Nine thin-ning trees of 5-year-old teak clone trees were used for analyzing the cell morphology and air-dry density. Vessel diameters in pore and outer pore zones were 165 and 90 μm, respectively. Mean value of fiber diameter, cell wall thickness, and fiber length in outer pore zone were 14.6 μm, 2.07 μm, and 1.04 mm, respectively. In addition, mean value of air-dry density was 0.55 g/cm<sup>3</sup>. The measurement and values of vessel diameter, fiber diameter, cell wall thickness, fiber length and air-dry density in the experimental had lower than those in the older teak. Therefore, it could be suggested that the wood from thinning young teaks was not appropriate as construction material, but it could be used for furniture which do not need high of strength properties. Furthermore, since the measurements values of anatomical characteristics were still increasing from pith to bark, it could be suggested that 5-year-old teak clones are still in a juvenile phase. Positively significant correlations were found between air-dry density and cell wall thickness, indicating that cell wall thickness is strongly correlated with wood density of teak.
Tamaryska SETYAYUNITA,Ragil Widyorini,Sri Nugroho Marsoem,Denny Irawati 한국목재공학회 2022 목재공학 Vol.50 No.2
Currently, biofibers are used as a reinforcement in polymer composites for structural elements and construction materials instead of the synthetic fibers which cause environmental problems and are expensive. One of the chemicals with a pH close to neutral that can be potentially used as a modified fiber material is sodium chloride (NaCl). Therefore, this study aims to investigate the characteristics of a composite board made from NaCl-treated kenaf fiber. A completely randomized design method was used with consideration of two factors: the content of NaCl in the treatment solution (1 wt%, 3 wt%, and 5 wt%) and the duration of immersion of fibers in the solution (1 h, 2 h, and 3 h). The NaCl treatment was conducted by soaking the fibers in the solution for different durations. The fibers were then rinsed with water until the pH of the water reached 7 and subsequently dried inside an oven at 80℃for 6 h. Kenaf fiber and epoxy were mixed manually with the total loading of 20 wt% based on the dry weight of the fiber. Physical and mechanical properties of the fibers were then evaluated based on JIS A 5908 particleboard standards. The results showed that increasing NaCl content in the fiber treatment solution can increase the physical and mechanical properties of the composite board. The properties of fibers treated with 5 wt% NaCl for 3 h were superior with a modulus of elasticity of 2.085 GPa, modulus of rupture of 19.77 MPa, internal bonding of 1.8 MPa, thickness swelling of 3%, and water absorption of 10.9%. The contact angle of untreated kenaf fibers was 104°, which increased to 80° and 73° on treatment with 1 wt% and 5 wt% NaCl for 3 h, respectively.
Tamaryska SETYAYUNITA,Ragil Widyorini,Sri Nugroho Marsoem,Denny Irawati 한국목재공학회 2022 목재공학 Vol.50 No.6
Currently, composite board manufacturing using natural fibers has the potential to expand owing to environmental awareness. To produce a composite board, treatment is required to improve the mechanical and physical properties of the natural fibers. In this study, sodium chloride (NaCl) was used for the chemical treatment. However, studies on chemical treatments using NaCl are limited. This study aimed to investigate the characteristics of kenaf fibers after NaCl treatment. The NaCl treatment concentrations were 1, 3, and 14 5 wt.% at room temperature, with soaking durations of 1, 2, and 3 h. The tensile strength, strain, and Young’s modulus were measured to evaluate the mechanical properties of the fibers. The fiber bundle diameter, weight change owing to treatment, and contact angle were determined to analyze the effect of NaCl treatment. The kenaf fiber bundle treated with 5 wt.% NaCl for 3 h exhibited the highest tensile strength, Young’s modulus, reduction in fiber bundle diameter, weight change, and decrease in contact angle compared to those of untreated fiber bundles. The tensile properties of the fiber bundle exhibited a tendency to decrease with increasing fiber bundle diameter. Increasing the soaking duration from 1 to 2 h did not result in a significant decrease in the fiber bundle diameter or an increase in tensile strength. However, a further increase in the soaking duration from 2 to 3 h resulted in a considerable decrease in the fiber bundle diameter and an increase in the tensile strength.