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Developing Highly Dimensionally Stable Multi-Layered Oriented Strand Board from Acacia Mangium Willd. Impregnated with Low Molecular Weight Phenolic Resin

This study was carried out to investigate the effectiveness of pre-treatment of wood strands with low molecular weight phenol formaldehyde (LPF) resin to improve the dimensional stability of oriented strand board (OSB). The origin and extent of thickness swelling (TS) in OSB made from A. mangium...

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主要作者: Ong, Lay Lee
格式: Thesis
語言:English
English
出版: 2002
主題:
Mangium - Fiberboard - Case studies
在線閱讀:http://psasir.upm.edu.my/id/eprint/10107/1/FH_2002_13_A.pdf
http://psasir.upm.edu.my/id/eprint/10107/
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spelling my.upm.eprints.101072024-03-13T03:33:12Z http://psasir.upm.edu.my/id/eprint/10107/ Developing Highly Dimensionally Stable Multi-Layered Oriented Strand Board from Acacia Mangium Willd. Impregnated with Low Molecular Weight Phenolic Resin Ong, Lay Lee This study was carried out to investigate the effectiveness of pre-treatment of wood strands with low molecular weight phenol formaldehyde (LPF) resin to improve the dimensional stability of oriented strand board (OSB). The origin and extent of thickness swelling (TS) in OSB made from A. mangium Willd. were also investigated. Three- and five-layered OSBs were fabricated with 5% resin solid based on oven dry weight of wood strands (w/w) of phenol formaldehyde (PF) resin as a binder. The origin of TS was determined by using coating method where the edges and surfaces of the panel were coated with oil-based pigmented paint. To assess the degree of TS, the OSB specimens were sliced/sectioned into four layers through the thickness direction of the panel and were subjected to 24 hours of cold water soaking. The results showed that the water uptake by the panel occurred mainly through the four edges. The board surfaces absorbed 20% more water than those in the core. The distribution of TS and water absorption (WA) for the sectioned layers were found to resemble that of the vertical density profile of the OSB panel. The surface layers of the panel had relatively higher density, thus contribute significant influence over the TS of the board. The Pearson ratio showed a very high correlation between the board density and TS (R2 = 0.87 and 0.96 for three- and five-layered OSB, respectively). The untreated five-layered OSB (control) was found to be more stable than that of three-layered due to the presence of higher resin content in the surfaces (fine particles). 2002 Thesis NonPeerReviewed text en http://psasir.upm.edu.my/id/eprint/10107/1/FH_2002_13_A.pdf Ong, Lay Lee (2002) Developing Highly Dimensionally Stable Multi-Layered Oriented Strand Board from Acacia Mangium Willd. Impregnated with Low Molecular Weight Phenolic Resin. Masters thesis, Universiti Putra Malaysia. Mangium - Fiberboard - Case studies English
institution Universiti Putra Malaysia
building UPM Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Putra Malaysia
content_source UPM Institutional Repository
url_provider http://psasir.upm.edu.my/
language English
English
topic Mangium - Fiberboard - Case studies
spellingShingle Mangium - Fiberboard - Case studies
Ong, Lay Lee
Developing Highly Dimensionally Stable Multi-Layered Oriented Strand Board from Acacia Mangium Willd. Impregnated with Low Molecular Weight Phenolic Resin
description This study was carried out to investigate the effectiveness of pre-treatment of wood strands with low molecular weight phenol formaldehyde (LPF) resin to improve the dimensional stability of oriented strand board (OSB). The origin and extent of thickness swelling (TS) in OSB made from A. mangium Willd. were also investigated. Three- and five-layered OSBs were fabricated with 5% resin solid based on oven dry weight of wood strands (w/w) of phenol formaldehyde (PF) resin as a binder. The origin of TS was determined by using coating method where the edges and surfaces of the panel were coated with oil-based pigmented paint. To assess the degree of TS, the OSB specimens were sliced/sectioned into four layers through the thickness direction of the panel and were subjected to 24 hours of cold water soaking. The results showed that the water uptake by the panel occurred mainly through the four edges. The board surfaces absorbed 20% more water than those in the core. The distribution of TS and water absorption (WA) for the sectioned layers were found to resemble that of the vertical density profile of the OSB panel. The surface layers of the panel had relatively higher density, thus contribute significant influence over the TS of the board. The Pearson ratio showed a very high correlation between the board density and TS (R2 = 0.87 and 0.96 for three- and five-layered OSB, respectively). The untreated five-layered OSB (control) was found to be more stable than that of three-layered due to the presence of higher resin content in the surfaces (fine particles).
format Thesis
author Ong, Lay Lee
author_facet Ong, Lay Lee
author_sort Ong, Lay Lee
title Developing Highly Dimensionally Stable Multi-Layered Oriented Strand Board from Acacia Mangium Willd. Impregnated with Low Molecular Weight Phenolic Resin
title_short Developing Highly Dimensionally Stable Multi-Layered Oriented Strand Board from Acacia Mangium Willd. Impregnated with Low Molecular Weight Phenolic Resin
title_full Developing Highly Dimensionally Stable Multi-Layered Oriented Strand Board from Acacia Mangium Willd. Impregnated with Low Molecular Weight Phenolic Resin
title_fullStr Developing Highly Dimensionally Stable Multi-Layered Oriented Strand Board from Acacia Mangium Willd. Impregnated with Low Molecular Weight Phenolic Resin
title_full_unstemmed Developing Highly Dimensionally Stable Multi-Layered Oriented Strand Board from Acacia Mangium Willd. Impregnated with Low Molecular Weight Phenolic Resin
title_sort developing highly dimensionally stable multi-layered oriented strand board from acacia mangium willd. impregnated with low molecular weight phenolic resin
publishDate 2002
url http://psasir.upm.edu.my/id/eprint/10107/1/FH_2002_13_A.pdf
http://psasir.upm.edu.my/id/eprint/10107/
_version_ 1794564278881091584
score 13.251813

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