SUITABILITY OF POPLAR AND BEECH LAMINAS FOR LAMINATED VENEER LUMBER MANUFACTURİNG USING MELAMINE FORMALDEHYDE ADHESIVE
Laminated Veneer Lumber (LVL) has been proven their usefulness and efficiency as framing members (girders, beams, joist, headers, panels, etc.)in construction. Their application and manufacture is limited in Turkey. In this study, four different types of 7-layers LVLs were successfully manufactured using sawed beech (B) and poplar (P) veneers, and melamine formaldehyde (MF) adhesive. In this work, LVLs were formed with two veneers for each surface and three veneers for core layer. Produced four different types of LVL were coded based on the type and location of the veneers. BBBBBBB, BBPPPBB, PPPPPPP and PPBBBPP were called as Group I, Group II, Group III and Group IV, respectively. As physical properties, oven dry specific gravity (SG) and moisture content (MC) were determined according to TS 2472 (1976a) and TS 2471 (1976b) standards. Mechanical properties like glueline shear strength, modulus of rupture (MOR), modulus of elasticity (MOE) and compression strength (CS)(parallel to grain) were also determined according to EN 314-1 (2004),EN310 (1993) and TS 2595 (Anonymous 1977)standards, respectively. Based on this study, the highest strength and SG values were obtained with all beech used veneers (Group I). On the other hand lowest values were recorded with all poplar veneers (Group III). It should be noted that contribution rate of beech veneers in LVL had an increase on both strength and SG values.