Wood Characteristics, Machi Wood Characteristics, Machi ning & Coating Properties ning & Coating Properties of Rubberwood Plantation of Rubberwood Plantation in China in China Haikou 2008-12-08 International Workshop on Rubberwood Processing International Workshop on Rubberwood Processing Technology and Promotion of Sustainable Development Technology and Promotion of Sustainable Development Youke ZHAO Xiaomei JIANG Jianxiong LU ( Research Institute of Wood Industry Chinese Academy of Forestry )
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Wood Characteristics, Machining & Coating Properties of Rubberwood Plantation in China Haikou 2008-12-08 International Workshop on Rubberwood Processing.
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of Rubberwood Plantation of Rubberwood Plantation in Chinain China
Haikou 2008-12-08
International Workshop on Rubberwood Processing International Workshop on Rubberwood Processing Technology and Promotion of Sustainable Technology and Promotion of Sustainable DevelopmentDevelopment
Youke ZHAO Xiaomei JIANG Jianxiong LU
( Research Institute of Wood IndustryChinese Academy of Forestry )
Test material : dried center lumbers (2 m (l) x 45mm(thickness)) from 27 rubber trees grown in Hainan Provided by Lezhoug Timber Plant of Hainan Nongken Timber Industry Co.
Tab.2 Physical & mechanical properties of rubberwood
Density and Density and strength strength :: MiddleMiddle
Species number
Air dried density g/cm3
Compression strength
parallel to the grain MPa
Bending strength
MPa
Modulus of elasticity
GPa
Toughness kJ/m2
Average 0.653 43.4 87.9 8.807 25.8
Standard deviation
0.036 4.833 11.351 1.343 9.065
1.4 1.4 Tension woodTension wood
Tension wood is common in rubberwood
impact of typhoon, existing in the tilt trunk and branch
distinctly different from the normal wood in anatomical, physical & mechanical and chemical properties
An important defect, should be paid more attention
Fibers with a gelatinous layer (G-layer)
• Differs in color and texture from the normal wood
• Fibers with a gelatinous layer (G-layer)
•Rough surface is readily occured when sawing, affecting the quality of lumbers
1.4 1.4 Tension woodTension wood
1.5 Natural durability1.5 Natural durability
• Only sapwood (no heartwood), non-durabl, easy decay,
•fresh sawn timber should be rapidly treated and dried
Three coating processes : 1 ) brush the water-soluble painting 3 times 2) brush polyester paintings 3 times 3) brush the water-soluble painting twice and then to
brush polyester painting once
3.1 Test methods of adhesion and wearability 3.1 Test methods of adhesion and wearability of coatingof coating
A cutterA cutter Taber Taber Abrasion Resistance InstrumentAbrasion Resistance Instrument
5B The edges of the cuts are completely smooth; none of the squares of the lattice is detached.
4B Small flakes of the coating are detached at intersections; less than 5 % of the area is affected.
II 3B Small flakes of the coating are detached along edges and at intersections
III 2B The coating has flaked along the edges and on parts of the squares.The area affected is 15 to 35 % of the lattice.
IV 1B The coating has flaked along the edges of cuts in large ribbons and whole squares have detached. The area affected is 35 to 65 % of the lattice.
V 0B Flaking and detachment worse than Grade 1.
Test results of coating adhesion Test results of coating adhesion
Tab. 6 The adhesion properties of 3 coating processes
Coating Processes
Grade I(%)
Grade II(%)
Grade III(%)
Quality points
The first 44.44 44.44 11.11 4.33
The second 0.00 44.44 55.56 3.44
The third 77.78 22.22 0.00 4.78
3.2 Wearability of coating3.2 Wearability of coating
Wearability of coating: the anti-abrasion capa
city of solid wood, which is very import for flo
oring
According to the weight loss per 100 rotates abrasion:
Grade I≤0.08g/100r 5pts
0.08g <Grade II ≤0.10g/100r 4pts
0.10g/100g <Grade III(Qualified)≤0.15g/100r 3pts
Grade IV: >0.15g/100r 2pts
Similar equation was used to calculate the OVERALL
Quality points
3.2 Wearability of coating3.2 Wearability of coating
Testing results of wearability of coatingTesting results of wearability of coating
Tab. 7 Wearability of coating of 3 different coating process
Coating Process Grade I(%)
Grade II
(%)Grade III(%)
Grade 4(%)
Quality Points
The first 100.00 5.00
The second 22.22 77.78 0.67
The third 33.33 66.67 4.33
4. Comparison of Machining & 4. Comparison of Machining & Coating Properties between Coating Properties between Rubberwood and OthersRubberwood and Others
Quality level of machining & coating properties of rubber wood are
The machining and coating properties are all excellent and wit
hin the Grade I range, which is better than that of furniture common used species such as oak, walnut and birch. Therefore, from the aspect of machining & coating properties, the rubberwood is good for solid wood products such as furniture and flooring
5. Conclusion5. Conclusion
Furniture are made of rubberwood
Kitchen board, knife rest and boxes are made of rubberwood