Effects of prestreaming and compressing pressure on the dimensional stability of densified wood

Wong T. S. Putra Malaysia Univ Fac of Forestry 43400 UPM Se, . and Paridah M. T., . and Zaidon A., . and Edi Suhaimi B., . and Azmi I., . (2009) Effects of prestreaming and compressing pressure on the dimensional stability of densified wood. [Proceedings Paper]

Wood densification is a process which increases wood density by modifying the cell structure either physically or mechanically. The process involves compressing the wood cells under conditions that do not damage the cell structure. Softening of the wood cell wall by steaming provides the most efficient method as both heat and moisture work as softening agent. In this study mahang wood Macaranga gigantea was compressed following presteaming at several durations. The specimens were taken from a 8-y-old tree with average wood density of 320 kg m-3 Transverse compression strength in radial direction of mahang wood was predetermined. Then the compressing pressures were calculated based on these strength values. The mahang wood was presteamed in a closed vessel at 130C for several durations. All the presteamed wood samples were densified by compressing the wood at a pressure which had been predetermined earlier. A compression of up to 70 compressive strain was recorded. The effects of presteaming and compressing pressure on dimensional stability of densified mahang were evaluated by immersing the densified wood specimens into cold water for 24 h. Upon soaking in water the thickness of the specimen increased between 51.4 and 64.4 .

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Abstract

Wood densification is a process which increases wood density by modifying the cell structure either physically or mechanically. The process involves compressing the wood cells under conditions that do not damage the cell structure. Softening of the wood cell wall by steaming provides the most efficient method as both heat and moisture work as softening agent. In this study mahang wood Macaranga gigantea was compressed following presteaming at several durations. The specimens were taken from a 8-y-old tree with average wood density of 320 kg m-3 Transverse compression strength in radial direction of mahang wood was predetermined. Then the compressing pressures were calculated based on these strength values. The mahang wood was presteamed in a closed vessel at 130C for several durations. All the presteamed wood samples were densified by compressing the wood at a pressure which had been predetermined earlier. A compression of up to 70 compressive strain was recorded. The effects of presteaming and compressing pressure on dimensional stability of densified mahang were evaluated by immersing the densified wood specimens into cold water for 24 h. Upon soaking in water the thickness of the specimen increased between 51.4 and 64.4 .

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Item Type:	Proceedings Paper
Additional Information:	1 table
AGROVOC Term:	Macaranga
AGROVOC Term:	Wood
AGROVOC Term:	Wood Compressed
AGROVOC Term:	Pressure
AGROVOC Term:	Compression process
Geographical Term:	MALAYSIA
Depositing User:	Ms. Suzila Mohamad Kasim
Last Modified:	24 Apr 2025 05:14
URI:	http://webagris.upm.edu.my/id/eprint/11455

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