Properties of parallel strand lumber from two hybrid poplar clones using melamine urea formaldehyde adhesive

Abstract

Experimental parallel strand lumbers (PSLs) were manufactured from fast growing rotary peeled I-214 (Populus x euramericana) and I-77/51(Populus deltoides) hybrid poplar clones veneer strands with melamine urea formaldehyde (MUF) adhesive. The results showed that hybrid poplar clones can be used in PSLs manufacturing. Physical and mechanical properties of PSLs were affected by clone types. The I-77/51 clone had better properties and was found to be more suitable for PSLs manufacturing compared to the I-214 clone. PSLs properties were higher than those of solid woods (SWs) and laminated veneer lumbers (LVLs) of the same poplar clones. This increase may be due to materials, densification as a result of high pressure use, and the manufacturing techniques. The degree of contribution of SWs properties to the PSLs properties was lower than that of LVLs. This indicated that factors other than SWs properties played more important roles in the strength increase of PSLs.

Determination of some physical and mechanical properties of parallel-strand lumber manufactured with bamboo (Phyllostachys bambusoides)

“…According to the data obtained, it was determined that there was a statistically significant (P-value < 0.05) difference between the 2-h and 24-h water absorption percentage values of the samples prepared with polyol-added adhesive. The data obtained were in agreement with previous studies (Kurt and Cavus 2011;Kurt et al 2012Kurt et al , 2013.…”

“…Statistically, polyol-added adhesive has a decreasing effect on impact strength. The impact resistance of parallel-strand lumber produced with different wood species obtained in previous studies showed a better performance than the dynamic bending resistance of the lumber from which it was produced (Wu et al 1998;Simpson et al 1999;Sulastiningsih and Santoso 2005;Kurt and Cavus 2011;Ahmad and Kamke 2011;Kurt et al 2012Kurt et al , 2013Li et al 2015;Gong et al 2016;He et al 2018;Zhang et al 2018). The load-deformation graphs obtained during the screw-holding capacity test are shown in Fig.…”

“…In previous studies on parallel-strand lumber, it was reported that the densities of the samples produced varied according to the material from which they were produced. It has been reported that an increase in density occurs, and this increase may be due to the use of highdensity adhesives and the high pressure applied during production under high temperatures, or the anatomical properties of the wood material may contribute to this increase (Kurt 2010;Kurt and Cavus 2011;Kurt et al 2012Kurt et al , 2013. The mean average moisture content values of PSL with pMDI and pMDI+5%MP adhesives were 5.13% and 4.92%, respectively.…”