Factors influencing bonding strength of laminated bamboo strips lumber (LBSL) were investigated in this paper. In order to find an optimized technology, this paper investigated how the thickness of bamboo strips, the ...Factors influencing bonding strength of laminated bamboo strips lumber (LBSL) were investigated in this paper. In order to find an optimized technology, this paper investigated how the thickness of bamboo strips, the assembly orientation of bamboo curtain, the type of adhesives, as well as coupling agent treatment of bamboo curtain affected the bonding strength. The following conclusions were drawn: 1)The thinner the thickness of the bamboo strips, the bigger the bonding strength of LBSL; 2) The assembly orientation of the bamboo curtain benefited the bonding strength, MOR and MOE; 3) The bonding strength increased with the use of phenol-resorcinol-formaldehyde (PRF) resin; and 4) Treatment of coupling agent could increase the bonding strength but decrease both MOR and MOE.展开更多
The objective of this study was to investigate the physical and mechanical performance of flakeboard reinforced with bamboo strips. The study investigated three different bamboo strip alignment patterns and an experim...The objective of this study was to investigate the physical and mechanical performance of flakeboard reinforced with bamboo strips. The study investigated three different bamboo strip alignment patterns and an experimental control. All panels were tested in static bending both along parallel and perpendicular to the lengths of the bamboo strips. Internal bond strength (IB), thickness swelling (TS), linear expansion (LE), and water absorption (WA) were also examined. As expected, modulus of rupture (MOR) and modulus of elasticity (MOE) were substantially greater for all three experimental panel types as compared to the control group. LE was also improved for all three experimental panel groups. The bamboo strip alignment patterns had no significant effect on TS, WA and IB. The sample means for MOR, MOE and LE tested perpendicular to the bamboo strip lengths yielded slightly lower mean values than corresponding samples tested parallel to the bamboo strips lengths. This difference in mechanical properties is largely attributed to low panel density in the failure zones.展开更多
The objective of the study was to determine the effect of bamboo-wood layer compositions on the properties of bamboo composite lumber. Laboratory scale bamboo composite lumbers （BCLs） with four different core layer ...The objective of the study was to determine the effect of bamboo-wood layer compositions on the properties of bamboo composite lumber. Laboratory scale bamboo composite lumbers （BCLs） with four different core layer materials, i.e., bamboo strips glued vertically, jabon wood plank （Anthocephalus cadamba Miq.）, manii wood plank （Maesopsis eminii Engl.） and sengon wood plank （Falcataria moluccana （Miq.） Barneby ＆ J.W. Grimes） were fabricated using Andong bamboo （Gigantochloa pseudoarundinacea （Steud.） Widjaja） strips glued horizontally as the outer layers and Andong bamboo zephyrs used as the second and the fourth layers. BCLs were manufactured using water based polymer-isocyanate （WBPI） adhesive with the glue spread of 250 g/m2, and the cold pressing time applied was 1 h. Results showed that physical and mechanical properties of BCLs were significantly affected by the layer compositions. The BCL consisted of 100% bamboo strips exhibited higher density （0.754 g/cm3） and mechanical properties （modulus of rupture （MOR） 1,162 kgf/cm2, modulus of elasticity （MOE） 173,757 kgf/cm2, compression strength 644.7 kgf/cm2 and hardness 553 kgf）, compared to BCLs, of which the core layer was made of wood plank （density 0.533 g/cm3, MOR 648 kgf/cm2, MOE 77,893 kgf/cm2, compression strength 389.7 kgf/cm2 and hardness 355 kgf, respectively）. No delamination occurred in all samples, indicating a high bonding quality. BCL made of 100% bamboo strips had strength values comparable to wood strength class I, while BCL with core layer made of wood plank of jabon, manii or sengon had strength values similar to wood strength class III. All BCLs produced are suitable for solid wood substitute.展开更多
为提高结构用竹篾层积材(LBSL)的强度性能,以间苯二酚为改性剂合成了系列热固型苯酚-间苯二酚-甲醛(PRF)树脂,用于制备毛竹LBSL。以热固型PRF树脂中间苯二酚质量百分含量、甲醛与苯酚的摩尔比及竹帘浸胶时树脂固体含量为影响因子,进行了...为提高结构用竹篾层积材(LBSL)的强度性能,以间苯二酚为改性剂合成了系列热固型苯酚-间苯二酚-甲醛(PRF)树脂,用于制备毛竹LBSL。以热固型PRF树脂中间苯二酚质量百分含量、甲醛与苯酚的摩尔比及竹帘浸胶时树脂固体含量为影响因子,进行了3因子3水平的正交试验,利用方差分析和显著性检验研究了因子对所制备毛竹LBSL物理力学性能的影响。结果表明:树脂中间苯二酚质量百分含量对制备LBSL的弹性模量(MOE)及24 h吸水厚度膨胀率(24 h TS)影响非常显著;树脂中甲醛与苯酚摩尔比的变化对LBSL浸渍剥离率(DR)、24 h TS和游离醛含量(FF)影响非常显著;竹帘浸胶时树脂的固体含量对LBSL的24 h TS影响非常显著,对LBSL的静曲强度(MOR)影响显著。以热固型PRF树脂制备毛竹LBSL的优化因子水平为:间苯二酚质量百分含量1.5%、甲醛与苯酚摩尔比2.0∶1、竹帘浸胶时树脂固体含量为25.0%。展开更多
基金supported by the national Key Project of Scientific and Technical Supporting Programs of China (No.2006BAD19B0503)
文摘Factors influencing bonding strength of laminated bamboo strips lumber (LBSL) were investigated in this paper. In order to find an optimized technology, this paper investigated how the thickness of bamboo strips, the assembly orientation of bamboo curtain, the type of adhesives, as well as coupling agent treatment of bamboo curtain affected the bonding strength. The following conclusions were drawn: 1)The thinner the thickness of the bamboo strips, the bigger the bonding strength of LBSL; 2) The assembly orientation of the bamboo curtain benefited the bonding strength, MOR and MOE; 3) The bonding strength increased with the use of phenol-resorcinol-formaldehyde (PRF) resin; and 4) Treatment of coupling agent could increase the bonding strength but decrease both MOR and MOE.
文摘The objective of this study was to investigate the physical and mechanical performance of flakeboard reinforced with bamboo strips. The study investigated three different bamboo strip alignment patterns and an experimental control. All panels were tested in static bending both along parallel and perpendicular to the lengths of the bamboo strips. Internal bond strength (IB), thickness swelling (TS), linear expansion (LE), and water absorption (WA) were also examined. As expected, modulus of rupture (MOR) and modulus of elasticity (MOE) were substantially greater for all three experimental panel types as compared to the control group. LE was also improved for all three experimental panel groups. The bamboo strip alignment patterns had no significant effect on TS, WA and IB. The sample means for MOR, MOE and LE tested perpendicular to the bamboo strip lengths yielded slightly lower mean values than corresponding samples tested parallel to the bamboo strips lengths. This difference in mechanical properties is largely attributed to low panel density in the failure zones.
文摘The objective of the study was to determine the effect of bamboo-wood layer compositions on the properties of bamboo composite lumber. Laboratory scale bamboo composite lumbers （BCLs） with four different core layer materials, i.e., bamboo strips glued vertically, jabon wood plank （Anthocephalus cadamba Miq.）, manii wood plank （Maesopsis eminii Engl.） and sengon wood plank （Falcataria moluccana （Miq.） Barneby ＆ J.W. Grimes） were fabricated using Andong bamboo （Gigantochloa pseudoarundinacea （Steud.） Widjaja） strips glued horizontally as the outer layers and Andong bamboo zephyrs used as the second and the fourth layers. BCLs were manufactured using water based polymer-isocyanate （WBPI） adhesive with the glue spread of 250 g/m2, and the cold pressing time applied was 1 h. Results showed that physical and mechanical properties of BCLs were significantly affected by the layer compositions. The BCL consisted of 100% bamboo strips exhibited higher density （0.754 g/cm3） and mechanical properties （modulus of rupture （MOR） 1,162 kgf/cm2, modulus of elasticity （MOE） 173,757 kgf/cm2, compression strength 644.7 kgf/cm2 and hardness 553 kgf）, compared to BCLs, of which the core layer was made of wood plank （density 0.533 g/cm3, MOR 648 kgf/cm2, MOE 77,893 kgf/cm2, compression strength 389.7 kgf/cm2 and hardness 355 kgf, respectively）. No delamination occurred in all samples, indicating a high bonding quality. BCL made of 100% bamboo strips had strength values comparable to wood strength class I, while BCL with core layer made of wood plank of jabon, manii or sengon had strength values similar to wood strength class III. All BCLs produced are suitable for solid wood substitute.
文摘为提高结构用竹篾层积材(LBSL)的强度性能,以间苯二酚为改性剂合成了系列热固型苯酚-间苯二酚-甲醛(PRF)树脂,用于制备毛竹LBSL。以热固型PRF树脂中间苯二酚质量百分含量、甲醛与苯酚的摩尔比及竹帘浸胶时树脂固体含量为影响因子,进行了3因子3水平的正交试验,利用方差分析和显著性检验研究了因子对所制备毛竹LBSL物理力学性能的影响。结果表明:树脂中间苯二酚质量百分含量对制备LBSL的弹性模量(MOE)及24 h吸水厚度膨胀率(24 h TS)影响非常显著;树脂中甲醛与苯酚摩尔比的变化对LBSL浸渍剥离率(DR)、24 h TS和游离醛含量(FF)影响非常显著;竹帘浸胶时树脂的固体含量对LBSL的24 h TS影响非常显著,对LBSL的静曲强度(MOR)影响显著。以热固型PRF树脂制备毛竹LBSL的优化因子水平为:间苯二酚质量百分含量1.5%、甲醛与苯酚摩尔比2.0∶1、竹帘浸胶时树脂固体含量为25.0%。
