Optimization of pressing parameters of PF-bonded laminated bamboo lumber from Dendrocalamus brandisii
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ORIGINAL ARTICLE
Optimization of pressing parameters of PF-bonded laminated bamboo lumber from Dendrocalamus brandisii Bhushan U. Kelkar1 • S. K. Sharma1 • S. R. Shukla1
Received: 24 June 2020 / Accepted: 1 September 2020 Ó Indian Academy of Wood Science 2020
Abstract Bamboo being a fibrous lignocellulosic material has been used in numerous applications including structural and nonstructural sectors. Currently, there has been lot of interest to use the bamboo in engineered composites such as laminated bamboo lumber (LBL) for various end uses. The processing parameters for producing bamboo composites have enormous effects on their properties and overall performance. The focus of the present work was to study the effect of two important hot pressing parameters, i.e., specific pressure (10–25 kg/cm2) and pressing duration (15–25 min) on various properties of the LBL prepared using thin strips of Dendrocalamus brandisii bonded together with phenol formaldehyde (PF) resin. Various physical and mechanical properties of LBL such as moisture, density, water absorption, thickness swelling, volumetric swelling, modulus of rupture (MOR), modulus of elasticity (MOE) and compressive strength parallel to grain and perpendicular to the glue line were evaluated. The results showed that pressure and pressing duration had significant effect on the physical and mechanical properties of LBL. For superior physical and mechanical performance, the pressure of 20 kg/cm2 along with the pressing duration of 25 min can be suggested for D. brandisii LBL bonded with PF adhesive. Keywords Bamboo Dendrocalamus brandisii Density Compressive strength MOE MOR
& S. R. Shukla [email protected] 1
Institute of Wood Science and Technology, Malleswaram P.O, Bangalore 560 003, India
Introduction Trend of utilizing sustainable and eco-friendly building and constructional materials has gained a lot of importance globally due to environmental concerns and lower energy requirements unlike steel and concrete. Bamboo is one of such materials which is being used in modern buildings as it is renewable, fast growing and has superior strength properties (Van der Lugt et al. 2006; Sinha et al. 2014). Bamboo is preferred as a potential alternative material over high-quality wood and wood-based products (Chaowana 2013; Sharma et al. 2015). However, utilization of round bamboo as a constructional material is restricted due to variation in mechanical properties and its susceptibility to biological degradation (Sharma et al. 2015). To overcome these problems and maximizing utilization of available bamboo raw material, laminated bamboo lumber (LBL) can serve as a superior alternative (Chaowana 2013; Mahdavi et al. 2011). LBL is a bamboo-based composite material produced using structural-grade adhesives to join strands, strips or flattened bamboo. The resulted product exhibits uniform cross section and is far more convenient to use compared to round bamboo. The LBL composite maintains the inherent properties of bamboo while providing better utilization pos
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