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RISS 인기검색어
- 검색키워드
- 저자 : Greitta Kusuma Dewi (검색결과 2 건)
- 무료
- 기관 내 무료
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Properties of Citric Acid-bonded Composite Board from Elephant Dung Fibers
( Ragil Widyorini ),( Greitta Kusuma Dewi ),( Widyanto Dwi Nugroho ),( Tibertius Agus Prayitno ),( Agus Sudibyo Jati ),( Muhammad Nanang Tejolaksono ) 한국목재공학회 2018 목재공학 Vol.46 No.2
An elephant digests only around 30~45% of what it consumes; therefore the undigested material mainly passes as intact fibres. Elephant food is usually composed of grass, leaves, twigs, bark, fruit and seed pods. This research aimed to utilize the elephant dung fibers as material for composite board and citric acid as a bonding agent. Citric acid contents in this research were set at 0 wt% (binderless composite board), 10 wt%, 20 wt%, and 30 wt% based on dry weight particles, while the target density was set at 0.8 g/cm<sup>3</sup>. Pressing temperatures were set at 180℃ and 200℃ with the pressing time was 10 minutes. Physical and mechanical properties tests were then performed according to Japanese Industrial Standard A 5905. The result showed that elephant dung fibers could be used as potential materials for composite board. Addition of citric acid and pressing temperature significantly increased the quality of composite board. Infrared analysis indicated that the presence of ester linkages much higher with the increasing of citric acid content and pressing temperature. The optimum properties of composite board made from elephant dung fibers could be achieved at pressing temperature of 200℃ and a citric acid content of 20 wt%.
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Selected Properties of Particleboard Made from Sugar Palm (Arenga pinnata) Dregs
Faza AISYADEA,Greitta Kusuma Dewi,Ragil Widyorini 한국목재공학회 2023 목재공학 Vol.51 No.5
Dregs from the sugar palm (Arenga pinnata) starch industry are considered a waste product of the agricultural industry and have not yet been optimally utilized. Therefore, this study aimed to manufacture particleboards from dregs using different amounts of adhesive and particle size ratios. Sugar palm dregs, which had been separated into fibers and powder/fine particles, were used as raw material for making particleboards. The fiber had an average length of 6.84 ± 3.23 cm, while the fine particles were of a size that passed through size 10 mesh and remained in size 60 mesh. Three ratios of fiber to fine particles (100:0, 75:25, and 50:50 wt%) with three different amounts of sucrose-citric acid adhesive (10, 15, and 20 wt%) were used in this study. Increasing the amount of fine particles and the resin content can improve the physical properties and the internal bond strength of boards made from sugar palm dregs. The fine particles possibly filled the gap between the fibers in the particleboard, while the fibers exhibited a high bending strength. As a result, a high-performance particleboard can be attained by combining the composition ratio of fiber/fine particles and resin content. In this study, particleboards made from fiber/fine particles (75:25 wt%) and adhesive content of 15 wt% and 20 wt% had the mechanical properties that met the requirements of Japanese Industrial Standard (JIS) A 5908 type 18. Sugar palm dregs have the potential to be used as raw materials to create value-added particleboards.
ScienceON
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