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Physical properties and bonding quality of laminated veneer lumber produced with veneers peeled from small-diameter rubberwood logs
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 venee...
Autores principales: | , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
The Royal Society
2019
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6936297/ https://www.ncbi.nlm.nih.gov/pubmed/31903217 http://dx.doi.org/10.1098/rsos.191763 |
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author | Khoo, P. S. Chin, K. L. H'ng, P. S. Bakar, E. S. Lee, C. L. Go, W. Z. Dahali, R. |
author_facet | Khoo, P. S. Chin, K. L. H'ng, P. S. Bakar, E. S. Lee, C. L. Go, W. Z. Dahali, R. |
author_sort | Khoo, P. S. |
collection | PubMed |
description | 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. |
format | Online Article Text |
id | pubmed-6936297 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2019 |
publisher | The Royal Society |
record_format | MEDLINE/PubMed |
spelling | pubmed-69362972020-01-03 Physical properties and bonding quality of laminated veneer lumber produced with veneers peeled from small-diameter rubberwood logs Khoo, P. S. Chin, K. L. H'ng, P. S. Bakar, E. S. Lee, C. L. Go, W. Z. Dahali, R. R Soc Open Sci Engineering 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. The Royal Society 2019-12-04 /pmc/articles/PMC6936297/ /pubmed/31903217 http://dx.doi.org/10.1098/rsos.191763 Text en © 2019 The Authors. http://creativecommons.org/licenses/by/4.0/ Published by the Royal Society under the terms of the Creative Commons Attribution License http://creativecommons.org/licenses/by/4.0/, which permits unrestricted use, provided the original author and source are credited. |
spellingShingle | Engineering Khoo, P. S. Chin, K. L. H'ng, P. S. Bakar, E. S. Lee, C. L. Go, W. Z. Dahali, R. Physical properties and bonding quality of laminated veneer lumber produced with veneers peeled from small-diameter rubberwood logs |
title | Physical properties and bonding quality of laminated veneer lumber produced with veneers peeled from small-diameter rubberwood logs |
title_full | Physical properties and bonding quality of laminated veneer lumber produced with veneers peeled from small-diameter rubberwood logs |
title_fullStr | Physical properties and bonding quality of laminated veneer lumber produced with veneers peeled from small-diameter rubberwood logs |
title_full_unstemmed | Physical properties and bonding quality of laminated veneer lumber produced with veneers peeled from small-diameter rubberwood logs |
title_short | Physical properties and bonding quality of laminated veneer lumber produced with veneers peeled from small-diameter rubberwood logs |
title_sort | physical properties and bonding quality of laminated veneer lumber produced with veneers peeled from small-diameter rubberwood logs |
topic | Engineering |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6936297/ https://www.ncbi.nlm.nih.gov/pubmed/31903217 http://dx.doi.org/10.1098/rsos.191763 |
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