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Effects of Anatomical Characteristics of Ethiopian Lowland Bamboo on Physical and Mechanical Properties

Chinese Forestry Science and Technology 2009年第3期8卷 32-43页

作者： seyoum kelemwork Forest Products Utilization Research Centre

The main aim of this study was to evaluate the effects of anatomical characteristics of Ethiopian lowland bamboo on selected physical and mechanical properties. A total of 45 solid culms from three different age groups (2-, 3- and 4- year-old) were harvested from natural bamboo forest in Ethiopia and then samples were transported to China for carrying out anatomical characteristics test. Physical and mechanical properties testing were conducted in Ethiopia. The result indicates that age and height had significant effects on fiber length, fiber diameter and fiber wall thickness and insignificant effects on vascular bundles concentration. More over, fiber length, fiber diameter and vascular bundle size have a significant effect on both properties of this solid culm. The density and moisture content (MC) were highly affected by age and height variations. Density increased with an increase of age and MC decreased with an increase of age. The higher values of modulus of rupture (MOR) and modulus of elasticity (MOE) were obtained in the middle portions of height. Both values showed decreasing trend towards the top portion. Compression strength of culms decreases with increases of age and height. The results of correlation analyses revealed that the fiber length, the fiber diameter and the fiber wall thickness all had a positive correlation with the density and a negative correlation with MC. All anatomical variables showed insignificant correlation with all the shrinkages except the fiber wall thickness that showed a negative correlation with the radial shrinkage. The result further revealed a positive correlation of density with MOR and a negative correlation with MOE. The fiber length also showed a positive correlation with MOE. Both the fiber diameter and the vascular bundle size showed a positive correlation with the compression strength. However, MC showed a negative correlation.

关键词： Oxythenantera abyssinica vascular bundle fiber length physical property mechanical property

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Effect of Ratio of Face to Core Particles on Mechanical and Physical Properties of Particleboard Manufactured from Ethiopian Highland Bamboo

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Chinese Forestry Science and Technology 2009年第1期8卷 7-14页

作者： seyoum kelemwork PARIDAH Md.Tahi WONG Ee Ding RAHIM Sudin Forest Products Utilization Research Centre 2322 Addis AbabaEthiopia Faculty of Forestry Universiti Putra Malaysia43400 Serdang SelangorMalaysia Forest Research Institute Malaysia 52109 KepongKuala LumpurMalaysia

The study was conducted to evaluate effect of ratio of face to core particles on mechanical and physical properties of oriented strand board produced from Ethiopian highland ***-layered oriented particleboards were manufactured with 4 proportions of face to core particles at 750 kg/m^3 target *** percent urea formaldehyde resin was used as a *** and dimensional stability performances of all boards were assessed based on ISO *** results showed that modulus of rupture...

关键词： proportion strength internal bond screw withdrawal thickness swelling Ethiopian highland bamboo(Yushania alpine)

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