Factors Influencing Bonding Strength of Laminated Bamboo Strips Lumber

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.

Physical and Mechanical Properties of Flakeboard Reinforced with Bamboo Strips

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.

Some Properties of Bamboo Composite Lumber Made of Gigantochloa pseudoarundinacea

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.