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<p>This paper investigated effects of treatment parameters on equilibrium moisture content, water-repellent efficiency, anti-swelling efficiency, Janka hardness, and modulus of rupture of rubberwood (<i>Hevea brasiliensis</i>) subjected to heat treatment with a blend of natural oleoresin and waste cooking oil. Oleoresin, a non-timber forest product derived from Dipterocarp species, and waste cooking oil sourced from an oil recovery facility. Rubberwood samples were heat-treated using treatment media composed of natural oleoresin and waste cooking oil, with oleoresin ratios ranging from 20 to 40%, at temperatures between 130&#xa0;°C and 180&#xa0;°C for durations of 90 to 180&#xa0;min. Through response surface methodology analysis, three linear and two quadratic models were developed, each exhibiting high adjusted R-squared values, thereby confirming the adequacy of the models. The results demonstrated significant improvements in the dimensional stability of rubberwood, alongside notable effects of the treatment conditions on its strength properties, enabling the identification of optimal treatment parameters for heat treatment using oleoresin and waste cooking oil.</p>

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Optimization of natural oleoresin and waste cooking oil heat treatment conditions for rubberwood using response surface methodology

  • 期刊论文

  • 发表日期：

    2025年5月22日

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  • Thi Kim Hong Tang,
  • Nhat Quang Nguyen

摘要

This paper investigated effects of treatment parameters on equilibrium moisture content, water-repellent efficiency, anti-swelling efficiency, Janka hardness, and modulus of rupture of rubberwood (Hevea brasiliensis) subjected to heat treatment with a blend of natural oleoresin and waste cooking oil. Oleoresin, a non-timber forest product derived from Dipterocarp species, and waste cooking oil sourced from an oil recovery facility. Rubberwood samples were heat-treated using treatment media composed of natural oleoresin and waste cooking oil, with oleoresin ratios ranging from 20 to 40%, at temperatures between 130 °C and 180 °C for durations of 90 to 180 min. Through response surface methodology analysis, three linear and two quadratic models were developed, each exhibiting high adjusted R-squared values, thereby confirming the adequacy of the models. The results demonstrated significant improvements in the dimensional stability of rubberwood, alongside notable effects of the treatment conditions on its strength properties, enabling the identification of optimal treatment parameters for heat treatment using oleoresin and waste cooking oil.