Forest Products Research and Development Centre EFFECT OF LAYER COMPOSITION ON THE PROPERTIES OF LAMINTED BAMBOO LUMBER Ignasia M Sulastiningsih, Abdurachman & Achmad Supriadi Forest Products Research and Development Centre Research, Development and Innovation Agency Ministry of Environment and Forestry

INTRODUCTION Discrepancy between supply and demand of wood Bamboo is one of alternative material for solid wood substitute For more flexible application, the shape and dimension appear to limit the usage of bamboo as solid wood substitute Producing laminated bamboo lumber is one way to overcome the limitation In recent years the plantation forest become the major suppliers of logs, with the fast growing species and relatively small diameter logs The quality of wood from plantation forest is normally inferior compared with logs from natural forest To enhance the quality and improve the wood utilization, it can be used as the core layer of laminated bamboo lumber.

OBJECTIVE To determine the effects of layer composition on the properties of laminated bamboo lumber (LBL) MATERIALS AND METHODS MATERIALS Andong bamboo (Gigantochloa pseudoarundinacea) Jabon wood (Anthocephalus cadamba); Manii wood (Maesopsis eminii); Sengon wood (Falcataria moluccana) Boron solution Water based polymer-isocyanate adhesive METHODS Preparation of bamboo strips and bamboo zephyr Producing bamboo sheets Preparation of wood planks Producing laminated bamboo lumber Testing

PREPARATION OF BAMBOO STRIPS 4 4

PREPARATION OF BAMBOO ZEPHYR / FLATTENED BAMBOO

PRODUCING BAMBOO SHEETS Horizontal laminate Vertical laminate Vertical laminate Horizontal laminate

PREPARATION OF WOOD PLANKS Manii (Maesopsis eminii) Sengon (Falcataria moluccana Jabon (Anthocephalus cadamba)

PRODUCING LAMINATED BAMBOO LUMBER Type A Type B Type C Type D

RESULTS AND DISCUSSION Type A Types B, C, and D

Table 1. Physical properties and bonding quality of LBLs, the results of ANOVA and HSD. Properties Layers composition   ANOVA results A B C D MC (%) 12.6 12.2 13.7 13.4 - Density (g/cm3) 0.754 a 0.491 b 0.555 0.552 ** TS (%) 2.55 2.90 1.68 2.82 WA (%) 19.9 c 30.5 25.4 24.4 Delamination,% MC = Moisture content; TS= Thickness swelling; WA = Water absorption

Table 2. Mechanical properties of LBLs, the results of ANOVA and HSD. Layers composition   ANOVA results A B C D MOR (kg/cm2) 1 162 a 682 b 649 613 ** MOE (kg/cm2) 173 757 83 985 74 936 74 758 CS (kg/cm2) 644.7 407 397.7 364.6 Hardness (kg) 552.7 356.7 357.3 352.3 Hardness of Teak wood was 428 kg Hardness of Nyatoh wood was 302 kg

Figure 1. Density of laminated bamboo lumber

Figure 2. MOR of laminated bamboo lumber

Figure 3. Compression strength of laminated bamboo lumber

Figure 4. Hardness of laminated bamboo lumber

CONCLUSION The properties of laminated bamboo lumber were affected by the layers composition. Based on the Indonesian wood strength classification, laminated bamboo lumber made from all bamboo strips had strength values comparable to wood strength class I, while LBL with core layer made from wood plank of jabon, manii or sengon had strength values comparable to wood strength class III. All laminated bamboo lumbers produced are suitable for solid wood substitute as furniture and building materials.

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