Physical properties and bonding quality of laminated veneer lumber produced with veneers peeled from small-diameter rubberwood logs
| Autor: | Chuan Li Lee, Pui San Khoo, Paik San H'ng, E. S. Bakar, Kit Ling Chin, Wen Ze Go, R. Dahali |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
0106 biological sciences
Materials science rubberwood medicine.medical_treatment small-diameter log 01 natural sciences pressing temperature law.invention Engineering law 010608 biotechnology Lamination medicine Shear strength gluebond shear strength Composite material Rubberwood lcsh:Science veneer thickness 040101 forestry Pressing spindleless lathe technology Multidisciplinary Bond strength Laminated veneer lumber 04 agricultural and veterinary sciences 0401 agriculture forestry and fisheries Veneer lcsh:Q Adhesive Research Article |
| Zdroj: | Royal Society Open Science Royal Society Open Science, Vol 6, Iss 12 (2019) |
| ISSN: | 2054-5703 |
| Popis: | The peeling of small-diameter rubberwood logs from the current short-rotation practices undoubtedly will produce lower grade veneers compared to the veneers from conventional planting rotation. Hence, this raises the question of the properties of the produced laminated veneer lumber (LVL) from veneers peeled from small-diameter rubberwood logs using the spindleless lathe technology. Different thicknesses of rubberwood veneers was peeled from rubberwood logs with diameter less than 20 cm using a spindleless lathe. Three-layer LVLs were prepared using phenol formaldehyde (PF) adhesive and hot pressed at different temperatures. During the peeling of veneer, lathe checks as deep as 30–60% of the veneer thickness are formed. Owing to deeper lathe check on 3 mm rubberwood veneer, higher pressing temperature significantly increased the gluebond shear strength of the PF-bonded LVL. In addition, lathe check frequency was also shown to influence the bond strength. The presence of higher lathe check frequency on 2 mm veneer increased the wettability, thus facilitating optimum penetration of adhesive for stronger bonding. These findings stress the importance of measuring and considering the lathe check depth and frequency during the lamination process to get a better understanding of bonding quality in veneer-based products. |
| Databáze: | OpenAIRE |
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