PROPERTIES OF PINE SCRIM LUMBER MADE FROM MODIFIED SCRIM

摘要

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/m(3), 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.