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- 저자 : ( Andi Detti Yunianti ) (검색결과 4 건)
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( Andi Detti Yunianti ),( Suhasman ),( Agussalim ) 韓國木材工學會 2017 한국목재공학회 학술발표논문집 Vol.2017 No.1
Jabon wood (Anthocephalus cadamba) is most species in Sulawesi and this is species need to develop the utilization as raw material for particle board. The preliminary research, jabon wood is potentially produce a composite product, especially binderless. For reason economic and quality, this research will modify binderless particle board manufacturing process with combination oxidation treatment. The research evaluates the several basic properties of jabon wood and characteristics of binderless particleboard from jabon wood using several combination oxidation treatment. Basic properties (i.e., physical, mechanical and chemical) of jabon wood were measurement. There are several combination as oxidation, there are FeSO<sub>4</sub> (5% and 7.5%) : H<sub>2</sub>O<sub>2</sub> (5%, 10%, 15% and 20%) used in this research. The results showed, the density and specific gravity of jabon wood were 0.48 gcm<sup>-3</sup> and 0.55 respectively. The Modulus of Elasticity, Modulus of Rupture and compression strength parallel to grain of jabon wood were 72,812 kgf cm<sup>-2</sup>, 471 kgf cm<sup>-2</sup> and 198 kgf cm<sup>-2</sup>, respectively. The extractive contain after dissolved in alcohol-benzene 4.08 %. The binderless particle board from jabon wood in FeSO<sub>4</sub> 5% : H<sub>2</sub>O<sub>2</sub> 20% resulted in the better. The physical and mechanical properties of the binderless particleboard fulfill JIS A 5908 2003.
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( Andi Detti Yunianti ),( Kidung Tirtayasa P. ),( Suhasman ),( Ira Taskirawati ),( Agussalim ),( Musrizal Muin ) 한국목재공학회 2019 목재공학 Vol.47 No.4
Densification is a process for improving the strength properties of wood from the felling of young trees, which is a common harvest practice in community forests. A series of experiments was conducted to refine the process with particular regard to the determination of suitable pretreatment and treatment conditions. Samples of pine and gmelina measuring 23 cm (L) × 20 cm (W) × 2 cm (T) underwent pretreatment through immersion in a 1:1 CH<sub>3</sub>COOH-H<sub>2</sub>O<sub>2</sub> solution at concentrations of 15%, 20%, and 30%. Samples pretreated with the 20% solution showed the greatest improvement in strength; further experiments were conducted to determine the optimum treatment conditions in terms of temperature and duration following immersion. Test samples with the same dimensions as those in the pretreatment experiment were soaked in a 1:1 20% CH<sub>3</sub>COOH-H<sub>2</sub>O<sub>2</sub> solution and warmed in a water bath. The test samples were then individually hot pressed to the target thickness, which was 30% less than the original thickness and held at 150°C or 170°C for 15 or 30 minutes. The treated samples were cut for an analysis of their density, recovery of set, and bending strength. Pine and gmelina exhibited the best characteristics after treatment at 150°C for 30 and 15 minutes, respectively. The results suggest that the modified densification process had increased the bending strength of the wood, but the temperature and duration of treatment must be carefully considered for different wood species.
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Nopia CAHYANI,Andi Detti Yunianti,Suhasman,Kidung Tirtayasa Putra PANGESTU,Gustan PARI 한국목재공학회 2023 목재공학 Vol.51 No.1
One type of biomass that has promising potential for bio pellet production is spent coffee grounds (SCGs). However, previous studies have shown that SCGs in bio pellets cause a lot of smoke. Therefore, they need to be mixed with a material that has a higher calorific value to produce better quality pellets. One material that can be used is pine wood because it has a natural resin content that can increase the calorific value. The aim of this study was to examine the quality of bio pellets produced with SCGs and pine wood charcoal at different particle sizes. The charcoal was ground using either a hammer mill (HM) or a ball mill (BM). Pine wood charcoal was mixed with SCGs at ratios of SCGs to pine wood charcoal of 4:6 and 6:4 by weight, respectively, and the adhesive used a tapioca with a composition ratio 5% of the raw material. The bio pellets were produced using a manual pellet press. The quality of the bio pellets was assessed based on Indonesian National Standard (SNI) 8021-2014, and the physical observations include flame length, burning rate, and compressive strength. The average water content, ash content, and calorific value of the bio pellets were in accordance with SNI 8021-2014, but the density and ash content values were below the standard values. The BM variation of bio pellets had a higher compressive strength than the HM variation, and the 4:6 BM variation had the longest burning time compared with 4:6 HM.
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( Alvin Muhammad Savero ),( Imam Wahyudi ),( Istie Sekartining Rahayu ),( Andi Detti Yunianti ),( Futoshi Ishiguri ) 한국목재공학회 2020 목재공학 Vol.48 No.5
Muna teakwood, especially from old stands, has been popular as raw material for timber industries in Indonesia for the past ten decades. Due to the scarcity of this wood, superior-grown seedlings of Muna teakwood have been developed and widely planted. Since there is no information on its characteristics, therefore, the aim of this research was to investigate wood characteristics of the 8-year-old superior-grown teak from Muna Island to ensure their proper utilization as raw material for wooden furniture. Wood discs and boards from basal area of three different trees were used as the samples. Macroscopic and microscopic anatomical characteristics were observed following the IAWA's list, while their physicalmechanical properties were measured following British Standard 373-57. Results showed that anatomical characteristics of this wood sample are similar to regular teakwood, but its heartwood portion is higher. Differences among trees are found in regards to wood texture, growth ring width, as well as early and latewood portion. The green moisture content was lower than that of fast-growing teak of a similar age. The wood is more stable than the old teakwood, but its specific gravity is lower. In general, mechanical properties of this wood were higher than those of the regular fast-growing teakwood, but lower than the old one. Based on its specific gravity, this superior Muna teakwood was categorized as a Strength Class of III. The wood is suitable enough for wooden furniture manufacturing.
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