Bamboo Panel Boards - International Network for Bamboo and Rattan
Bamboo Panel Boards - International Network for Bamboo and Rattan
Bamboo Panel Boards - International Network for Bamboo and Rattan
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44BAMBOO PANEL BOARDSthose adopted <strong>for</strong> wood-based fiberboard <strong>and</strong> MDF have been suggested. Chips areprepared in 20 x 5 mm size <strong>and</strong> immersed in water to increase the moisture contentto 40-50%. They are then steamed at 170°C under pressure <strong>for</strong> 15 minutes. Afterdefibering <strong>and</strong> refining, PF resin <strong>and</strong> wax are added. The pH of the furnish is adjustedto 5. Mat is <strong>for</strong>med, pre-pressed <strong>and</strong> hot-pressed. For manufacturing a 4-mm boardof 1 000 kg/m 3 density, 1 % PF resin <strong>and</strong> 1% wax are used.The technological parameters worked out on the basis of research completedso far are given in Tables 25-27.Table 25: Technological parameters <strong>for</strong> bamboo fiberboard <strong>and</strong> MDF (China)Board Thickness Density Freeness Temperature Pressure Time Adhesive Wax(mm) (kg/m3) (s) (°C) (MPa) (Min) (%) (%)Hardboard 4 1 000 18-20 210 6.0 7 1.0 1.0(wet process)MDFWet process) 10 700 18-20 200 3.5 1 6 5.0 1.0Dry process 9 750 15-17 1 8 0 3.5 8 11.0 1.0Table 26: Properties of bamboo (p pubescens) hardboard (wet process)PropertiesDetermined values China St<strong>and</strong>ardGB 12626-90Density (kg/m 3 ) 980Modulus of rupture (MPa) 5.3Moisture content (%) 46Moisture absorption (%) 18.9>803-1039 (first grade)19.6 (special grade)2 350 2 960 >I 850 (special grade)0.48 0.80 >0.44 (first grade)1 370 1 520 >l 250 (special grade)6.86 5.42
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