PARTICLEBOARDS MADE FROM AUSTRALIAN RED CEDAR: PROCESSING VARIABLES AND EVALUATION OF MIXED-SPECIES
This work was developed in two stages with the following aims: (1) to evaluate physical and mechanical properties of particleboards made from wood residues of Toona ciliata with target densities of 0.65 and 0.70 g cm-3 and 6 and 9% adhesive contents, and (2) to compare particleboards made from 100%...
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Veröffentlicht in: | Journal of tropical forest science 2012-04, Vol.24 (2), p.162-172 |
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Zusammenfassung: | This work was developed in two stages with the following aims: (1) to evaluate physical and mechanical properties of particleboards made from wood residues of Toona ciliata with target densities of 0.65 and 0.70 g cm-3 and 6 and 9% adhesive contents, and (2) to compare particleboards made from 100% T. ciliata particles (TC) with particleboards made from 50% T. ciliata particles mixed with 50% Pinus oocarpa particles (TC/P) or 50% Eucalyptus hybrid clone particles (TC/E). In the first stage, best results were obtained with 9% urea-formaldehyde and target density of 0.70 g cm-3. These processing variables were chosen for the production of mixed-species particleboards in the second stage of the work. TC particleboards had higher mechanical properties than mixed-species particleboards. For physical properties, TC particleboards were similar to TC/P particleboards. TC/E particleboards showed lowest results of mechanical properties and highest values of physical properties, and they are also suitable for interior applications. The results showed great potential in using wood residues of T. ciliata alone or mixed with Eucalyptus or Pinus species in particleboard production. Kajian ini dibangunkan dalam dua peringkat dengan tujuan berikut: (1) untuk menilai ciri-ciri fizikal dan mekanik papan serpai daripada sisa kayu Toona ciliata dengan ketumpatan sasaran 0.65 g cm-3 dan 0.70 g cm-3 serta kandungan perekat sebanyak 6% dan 9%, dan (2) untuk membandingkan papan serpai daripada 100% T. ciliata (TC) dengan papan serpai yang dibuat daripada 50% zarah T. ciliata yang dicampur dengan 50% zarah Pinus oocarpa (TC/P) atau 50% zarah hibrid klon Eucalyptus (TC/E). Pada peringkat pertama, keputusan terbaik diperoleh dengan 9% urea formaldehid and ketumpatan sasaran 0.70 g cm-3. Pembolehubah pemprosesan ini kemudiannya dipilih bagi peringkat kedua kajian iaitu penghasilan papan serpai spesies campuran. Papan serpai TC mempunyai ciri mekanik yang lebih tinggi berbanding papan serpai spesies campuran. Bagi ciri fizikal, papan serpai TC adalah sama dengan papan serpai TC/P. Papan serpai TC/E menunjukkan ciri mekanik yang paling rendah tetapi ciri fizikal yang paling tinggi. Papan ini juga sesuai untuk kegunaan dalaman. Keputusan kajian menunjukkan bahawa sisa kayu T. ciliata sama ada 100% atau dicampur dengan spesies Eucalyptus atau Pinus mempunyai potensi besar dalam penghasilan papan serpai. |
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ISSN: | 0128-1283 |