1. 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

2. 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.

3. 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

4. PREPARATION OF BAMBOO STRIPS4 4

5. PREPARATION OF BAMBOO ZEPHYR / FLATTENED BAMBOO

6. PRODUCING BAMBOO SHEETS
Horizontal laminate
Vertical laminate
Vertical laminate
Horizontal laminate

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

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

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

10. 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

11. 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)
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

12. Figure 1. Density of laminated bamboo lumber

13. Figure 2. MOR of laminated bamboo lumber

14. Figure 3. Compression strength of laminated bamboo lumber

15. Figure 4. Hardness of laminated bamboo lumber

16. 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.

17. THANK YOU
FOR YOUR ATTENTION