Thermal compression effect on several properties of 8-year-old waru gunung (Hibiscus macrophylllus) wood

Basri E., . and Yuniarti K., . and Saefudin., . Thermal compression effect on several properties of 8-year-old waru gunung (Hibiscus macrophylllus) wood. pp. 74-82. ISSN 0128-1283

The study aimed to investigate the effect of thermal compression on the properties of 8-year-old waru gunung wood. Wood specimens with the dimension of 25 mm100 mm150 mm in thickness width and length respectively were heated at 180C and 200C for 4 h. During the heating process the specimens were subsequently compressed at 2.452 N mm for 40 mins at each temperature. Changes in the wood chemical structure were examined using the pyrolysis-gas chromatography-mass spectrometry the wood physical properties were tested according to ASTM D143-94 the wood surface hardness was tested using a Universal Testing Machine and the wood discoloration was examined using the CIELab method. The changes in crystallinity degree was examined using x-ray diffraction and cell structure were collected as supporting data. Results showed that the thermal compression at 180C and 200C caused severe degradation on the specimen carbohydrate but less for lignin. The sum effect of thermal compression on the specimens also consecutively increased the density by 34.24 and 41.87 and surface hardness by 52.78 and 63.09 and decreased the swelling thickness by 38.54 and 47.03 and the equilibrium moisture content by 36.53 and 38.59 at 180C and 200C respectively. Thermally compressed specimens also had darker colours glossier surfaces and smoother texture compared to non-thermally compressed specimens.

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Abstract

The study aimed to investigate the effect of thermal compression on the properties of 8-year-old waru gunung wood. Wood specimens with the dimension of 25 mm100 mm150 mm in thickness width and length respectively were heated at 180C and 200C for 4 h. During the heating process the specimens were subsequently compressed at 2.452 N mm for 40 mins at each temperature. Changes in the wood chemical structure were examined using the pyrolysis-gas chromatography-mass spectrometry the wood physical properties were tested according to ASTM D143-94 the wood surface hardness was tested using a Universal Testing Machine and the wood discoloration was examined using the CIELab method. The changes in crystallinity degree was examined using x-ray diffraction and cell structure were collected as supporting data. Results showed that the thermal compression at 180C and 200C caused severe degradation on the specimen carbohydrate but less for lignin. The sum effect of thermal compression on the specimens also consecutively increased the density by 34.24 and 41.87 and surface hardness by 52.78 and 63.09 and decreased the swelling thickness by 38.54 and 47.03 and the equilibrium moisture content by 36.53 and 38.59 at 180C and 200C respectively. Thermally compressed specimens also had darker colours glossier surfaces and smoother texture compared to non-thermally compressed specimens.

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Item Type:	Article
AGROVOC Term:	Hibiscus macrophyllus
AGROVOC Term:	Wood
AGROVOC Term:	Forest trees
AGROVOC Term:	Thermal properties
AGROVOC Term:	High temperature
AGROVOC Term:	Mass spectrometry
AGROVOC Term:	Chemical properties
AGROVOC Term:	Chemical structure
AGROVOC Term:	Discoloration
AGROVOC Term:	Heat treatment
Depositing User:	Mr. AFANDI ABDUL MALEK
Last Modified:	24 Apr 2025 00:55
URI:	http://webagris.upm.edu.my/id/eprint/10350

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