Properties of Medium Density Fibreboard Manufactured from Extracted and Unextracted Acacia Catechu Wood Chips
The project was carried out to evaluate the properties of medium density fibreboard from the extracted and unextracted woodchips. The boards were produced with a 13 % urea resin, and a 3 % isocyanate resin to obtain three densities which were targetted at 650, 750, and 850 kg/m³. The same resin...
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| Format: | Project Paper Report |
| Language: | English English |
| Published: |
1990
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| Subjects: | |
| Online Access: | http://psasir.upm.edu.my/id/eprint/9860/1/FH_1990_5_A.pdf |
| Summary: | The project was carried out to evaluate the
properties of medium density fibreboard from the extracted
and unextracted woodchips. The boards were produced with a
13 % urea resin, and a 3 % isocyanate resin to obtain
three densities which were targetted at 650, 750, and 850
kg/m³. The same resin concentrations and types were used
to produce board of the target density of 750 kg/m³. The
properties of the boards from the extracted
unextracted materials were determined and compared.
and
The chemical components of the wood were 64.27 %
holocellulose, 35.63 % alhpa-cellulose, 34.38 % lignin and
1.5 % ash, with the pH of 5 to 5.1.
The extracted woodchips yielded 88.35 % fibre whilst
the unextracted woodchip yielded 77.92 % fibre.
The strength properties of boards from the extracted
woodchip with 13 % urea resin met the 300-type of JISA
5906 for all three densities . The boards with 3 %
isocyanate resin met the 150-type for 650 kg/m3 and 750
kg/m3 and met the 300-type for 850 kg/m³. The urea bonded
boards gave higher strength than those bonded by
isocyanate resin.
The 750 kg/m³ boards from the unextracted woodchip
gave higher MOR with the urea than the isocyanate resin |
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