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Properties of Pine Scrim Lumber Made From Modified Scrim

Weiqi Leng, H. Michael Barnes

Abstract


In this study, scrim from small-diameter southern pine bolts was treated with melamine formaldehyde (MF), phenol formaldehyde (PF), and furfuryl alcohol (FA) at different loadings and formed into 25-mm-thick pine scrim lumber (PSL) panels. MOE, MOR, work to maximum load (WML), internal bond (IB), toughness, water absorption, thickness swelling, 5-h tangential dynamic swelling, and termite resistance were evaluated. Results showed that samples treated with 5% MF resin had the highest MOE, MOR, and WML values (15.3 GPa, 54.2 MPa, and 25.4 kJ/m3, respectively), whereas those treated with 10% MF resin had the highest IB and edgewise toughness values of 390 kPa and 12 N m, respectively. With respect to dimensional stability, samples treated with 20% FA had the lowest swelling values after 24-h submersion in water (anti-swelling efficiency [ASE] . 36.8%), and the lowest water absorption value (27.5%). Five-hour tangential dynamic swelling test revealed much higher dimensional stability for furfurylated samples (ASE >45%). As for termite resistance, both untreated and treated PSL had little weight loss (1.10-1.56%), high visual rating (8-9.3/10), and high mortality (100%) in laboratory tests. MF and FA impregnation proved to be feasible modification methods in this study.

 


Keywords


Pine Scrim Lumber, Phenol formaldehyde, Melamine formaldehyde, Furfuryl alcohol, Mechanical properties, Dimensional properties, Termite resistance.

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References


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