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Abstract
The objective of this study was to evaluate some of the properties of experimental medium-density fiberboard panels made from rubberwood (Hevea brasiliensis) using a combination of cassava (Manihot utilissima) starch and a low percentage of urea-formaldehyde (UF) resin as a binder. Experimental panels with density levels of 0.65 and 0.80 g/cm3 were made using 10 percent starch, 10 percent starch and 3 percent UF, and 10 percent UF for the control samples. The panels manufactured with 10 percent starch did not have satisfactory physical and mechanical properties based on Japanese Industrial Standards. However, average modulus of elasticity, modulus of rupture, and thickness swelling values of the sample types E and F manufactured using a combination of starch and UF were 2,044 MPa, 22.49 MPa, and 35.50 percent, respectively, which met required limits listed in Japanese Industrial Standard A-5908. The results of this study indicated that starch can be used as a viable alternative binder with limited addition of UF resin without having any significant adverse influence of bending properties of the samples. Based on formaldehyde emission tests, specimens made with 3 percent UF had an average value of 18.5 mg/100 g, while control samples having 10 percent UF resulted in 38.5 mg/100 g.
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http://www.forestprodjournals.org/doi/abs/10.13073/FPJ-D-11-00114.1?code=frps-site
Songklod Jarusombuti, Piyawade Bauchongkol, Salim Hiziroglu, and Vallayuth Fueangvivat
Songklod Jarusombuti, Piyawade Bauchongkol, Salim Hiziroglu, and Vallayuth Fueangvivat (2012) Properties of Rubberwood Medium-Density Fiberboard Bonded with Starch and Urea-Formaldehyde. Forest Products Journal: 2012, Vol. 62, No. 1, pp. 58-62.
Abstract
The objective of this study was to evaluate some of the properties of experimental medium-density fiberboard panels made from rubberwood (Hevea brasiliensis) using a combination of cassava (Manihot utilissima) starch and a low percentage of urea-formaldehyde (UF) resin as a binder. Experimental panels with density levels of 0.65 and 0.80 g/cm3 were made using 10 percent starch, 10 percent starch and 3 percent UF, and 10 percent UF for the control samples. The panels manufactured with 10 percent starch did not have satisfactory physical and mechanical properties based on Japanese Industrial Standards. However, average modulus of elasticity, modulus of rupture, and thickness swelling values of the sample types E and F manufactured using a combination of starch and UF were 2,044 MPa, 22.49 MPa, and 35.50 percent, respectively, which met required limits listed in Japanese Industrial Standard A-5908. The results of this study indicated that starch can be used as a viable alternative binder with limited addition of UF resin without having any significant adverse influence of bending properties of the samples. Based on formaldehyde emission tests, specimens made with 3 percent UF had an average value of 18.5 mg/100 g, while control samples having 10 percent UF resulted in 38.5 mg/100 g.
For further details log on website :
http://www.forestprodjournals.org/doi/abs/10.13073/FPJ-D-11-00114.1?code=frps-site
