Effects of steam treatment as a pretreatment on the compressive deformation behavior of Phenol formaldehyde PF resin impregnated wood

Md. Iftekhar Shams, . and Hiroyuki Yano, . (2006) Effects of steam treatment as a pretreatment on the compressive deformation behavior of Phenol formaldehyde PF resin impregnated wood. [Proceedings Paper]

This study evaluated the potential of steam pretreatment for making highly compressed PF Phenol Formaldehyde resin-impregnated wood at low pressing pressure. Sawn veneers of Japanese cedar Cryptomeria-japonica were first subjected to saturated steam at different steaming temperatures followed by impregnation with 20 low molecular weight PF resin in aqueous solution resulting in a weight gain of 50-55. Four oven-dried treated veneers were laminated and compressed up to a pressing pressure of 1 MPa at 150 omnicron c with a pressing speed of 5mm/min and the pressure was held for 30 minutes. Steam treatment caused partial hydrolysis of hemicellulose accelerated the compressibility of Japanese cedar in the PF resin swollen condition. As a consequence a discernible increment in density was achieved at a pressing pressure of 1 MPa due to steam pretreatment applied between 140 to 200 omnicron c for 10 minutes. It was also found that even a short steaming time such as 2 minutes at 160 omnicron c is sufficient for obtaining appreciable compression of PF resin-impregnated wood. The density Youngs modulus and bending strength of steam treated 200 omnicron c for 10 minutes PF resin-impregnated wood composite reached 1.09g/cm3 20 GPa and 207 Mpa respectively. By contrast the values of untreaated PF resin-impregnated wood composites were 0.87 g/cm3 13 GPa and 170 Mpa respectively.

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Abstract

This study evaluated the potential of steam pretreatment for making highly compressed PF Phenol Formaldehyde resin-impregnated wood at low pressing pressure. Sawn veneers of Japanese cedar Cryptomeria-japonica were first subjected to saturated steam at different steaming temperatures followed by impregnation with 20 low molecular weight PF resin in aqueous solution resulting in a weight gain of 50-55. Four oven-dried treated veneers were laminated and compressed up to a pressing pressure of 1 MPa at 150 omnicron c with a pressing speed of 5mm/min and the pressure was held for 30 minutes. Steam treatment caused partial hydrolysis of hemicellulose accelerated the compressibility of Japanese cedar in the PF resin swollen condition. As a consequence a discernible increment in density was achieved at a pressing pressure of 1 MPa due to steam pretreatment applied between 140 to 200 omnicron c for 10 minutes. It was also found that even a short steaming time such as 2 minutes at 160 omnicron c is sufficient for obtaining appreciable compression of PF resin-impregnated wood. The density Youngs modulus and bending strength of steam treated 200 omnicron c for 10 minutes PF resin-impregnated wood composite reached 1.09g/cm3 20 GPa and 207 Mpa respectively. By contrast the values of untreaated PF resin-impregnated wood composites were 0.87 g/cm3 13 GPa and 170 Mpa respectively.

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Item Type:	Proceedings Paper
Additional Information:	3 ills. 2 tables. 14 refs.
AGROVOC Term:	WATER VAPOUR
AGROVOC Term:	STEAMING
AGROVOC Term:	IMPROVED WOOD
AGROVOC Term:	RESINS
AGROVOC Term:	CRYPTOMERIA JAPONICA
AGROVOC Term:	JAPAN
Geographical Term:	MALAYSIA
Depositing User:	Ms. Norfaezah Khomsan
Last Modified:	24 Apr 2025 05:28
URI:	http://webagris.upm.edu.my/id/eprint/16915

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