Three particleboard types, including urea-formaldehyde (UF), melamine-formaldehyde (MF), and binderless, were made from three wood species, sengon (Paraserianthes falcataria), gmelina (Gmelina arborea), and mindi (Melia azedarach). Wood particle sizes of 10 to 20 mesh were manufactured for the 30 by 30 by 0.7-cm (length by width by thickness) boards, with 0.75 g/cm 3 as the density target. Binderless particleboards were made through particle activation with hydrogen peroxide and ferrous sulfate as the catalyst, and the boards were hot pressed at 180°C for 12 minutes. For the purpose of comparison, conventional particleboards were made with UF and MF, with the resin level at 10 percent and the boards hot pressed at 120°C for 7 minutes. All particleboards were conditioned for 8 months prior to testing against the subterranean termite (Coptotermes curvignathus Holmgren) in laboratory and field tests, and against the dry wood termite (Cryptotermes cynocephalus Light) in laboratory tests. Results showed that wood species affected particleboard resistance in both of the subterranean termite tests and that the type of particleboard affected board resistance in field tests. Particleboard from sengon wood had the lowest resistance in both tests, followed by from gmelina and mindi woods, and particleboards with UF and MF resins had better resistance than binderless particleboard in field tests. Particleboard type and wood species did not affect board resistance to dry wood termite attack.
Four fast-growing wood species, jabon (Anthocephalus cadamba), lento-lento (Arthrophyllum diversifolium), acacia (Acacia mangium) and pulai (Alstonia spp.), can be easily found in many areas of the South Sulawesi Community Forest. This research evaluates basic properties (physical, mechanical and chemical) and nanostructure of the woods of each species. Physical and mechanical properties were analyzed according to SNI 03-6847-2002 and ASTM D 143-2005, while the chemical components were analyzed according to TAPPI Standard. The nanostructure was determined by X-ray diffraction. The density, lignin, cellulose and nanostructure (the degree of crystallinity) analysis indicated that lento-lento and pulai would potentially produce a composite product superior especially binderless to that made from acacia and jabon wood. Acacia and jabon have a high density and a high lignin content with a low cellulose content. KeywordsBasic properties Nanostructure Jabon wood Pulai wood Lento-lento wood Acacia wood Testing and Materials (2005) Basic properties and nanostructure of wood from four fast growing spe... References ASTM American Standard for
Supercritical carbon dioxide method has starting to be used as environmental friendly method in preserving wood. It is expected to maintain physical and mechanical properties of bamboo. The purpose of this study was to determine the effect of the duration times of supercritical conditions and permethrin preservative concentrations on optimization of shear strength of laminated bamboo impregnated by using supercritical carbon dioxide in the initial process (blades) and final process (laminated bamboo). The RSM-CCD experimental design was used to determine the effect of duration times of supercritical carbon dioxide for 20, 25, 30, 35, 40 minutes and the effect of permethrin concentrations 0.1, 0.3, and 0.5% against the shear strength of laminated bamboos. Response surface analysis, using 10 version of design expert software, has been done to get the optimum condition which would produce maximum of shear strength. The results showed that permethrin concentrations have stronger influenced (based on RSM analysis) on the shear strength and durability of laminated bamboo than the times of supercritical carbon dioxide conditions. Optimization of the two combinations of increasing shear strength and endurance were supercritical conditions = 22.71 minutes, and preservative permethrin concentration = 0.24%. Shear strength of shear strength and decrease in combination weight is 85 kg / cm2 and 0.38%.
The fundamental weakness of the technology in manufacturing cement board is that the curing process takes a long time, which is about 28 days. CO2 injection technology has been shown to accelerate the hardening process. However, each of the wood species has a different response due to the presence of inhibitors, namely extractive component. This study aims to compare the characteristics of CO2 injection cement boards from three wood species. These three species came from hardwood, softwood, and non-wood groups, namely agathis (Agathis sp.), Gmelin (Gmelina arborea) and parring bamboo (Gigantochloa atter), respectively. The type of cement used was Portland Cement Composite (PCC). The three cement boards were made using the CO2 injection method. The characteristics of the cement board were tested according to JIS A 5417–1992. The results showed that agathis has good characteristics in terms of mechanical properties. Both Internal bonding and modulus of elasticity were better than others, but not with its modulus of rapture. As for physical properties, parring bamboo actually showed good performance. However, in general, these three species of cement boards did not meet the standard.
Binderless particleboards (BP) were produced from three different species of Sulawesi bamboos. Parring bamboo (Gigantochloa ater) was extracted from Tanralili Maros while betung bamboo (Dendrocalamus asper) and tallang bamboo (Schizostacyum barcahycladum) were extracted from Batu Papan Makale Tana Toraja. The bark and nodes were removed, followed by cutting into chips; air drying, and finally converting into fine particles. The particles were oxidized using hydrogen peroxide 15% based on oven dry particle weight and 7.5% ferrous sulfat based on hydrogen peroxide weight. Hot pressing was applied for 12 min at 180ºC. Seven types of bamboo BP were produced based on the raw materials, i.e. the bamboo species namely; parring bamboo, betung bamboo, tallang bamboo, parring-betung bamboo with ratio 1 : 1, parring-tallang bamboo with ratio 1 : 1, betung-tallang bamboo with ratio 1 : 1, and parring-betung-tallang bamboo with ratio 1 : 1 : 1. The results indicated that the characteristics of betung bamboo BP were better than the two other bamboos. The physical and mechanical properties however have not fulfilled JIS A 5908 2003 yet. Differences in BP characteristics were caused by the chemical contents of bamboo, especially lignin that is different from species to species.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
hi@scite.ai
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.