Bond streng th of resins
The bonding ability of the resins was examined in a lap joint
test using an Instron testometric M500-50 AT testing
machine at a crosshead speed of 1 mm/min. Lap shear
strength measured the degree of adhesion to a substrate
and the rigidity of the bond. Maritime pine (P. pinaster)
veneer with thickness of 3 mm was cut to rectangular
specimens 2.5 cm 11.5 cm, according to British
Standard 1204, 1965, part 2, for synthetic resins
adhesives. Resin was applied to an area of
2.5 cm 2.5 cm on one side of one end section of the
two pieces (Fig. 2). The spread rate of the adhesive was
120–150 g/m2 on a dry weight basis [12–14]. Two
adhesives-coated veneer boards were lapped together
with the grain parallel to each other and then pressed at
0.45 MPa. The press temperature and press time were
fixed at 195 8C and 4 min, respectively. After bonding, the
assemblies were conditioned in a Vo¨ tsch climate room
(25 8C and 65% relative humidity) for 24 h. Bonding quality
was evaluated from the percentage of wood failure at the
bonding area and the shear strength of each specimen.
Ten samples were tested of each formulation, with the
average value being recorded.
Bond streng th of resinsThe bonding ability of the resins was examined in a lap jointtest using an Instron testometric M500-50 AT testingmachine at a crosshead speed of 1 mm/min. Lap shearstrength measured the degree of adhesion to a substrateand the rigidity of the bond. Maritime pine (P. pinaster)veneer with thickness of 3 mm was cut to rectangularspecimens 2.5 cm 11.5 cm, according to BritishStandard 1204, 1965, part 2, for synthetic resinsadhesives. Resin was applied to an area of2.5 cm 2.5 cm on one side of one end section of thetwo pieces (Fig. 2). The spread rate of the adhesive was120–150 g/m2 on a dry weight basis [12–14]. Twoadhesives-coated veneer boards were lapped togetherwith the grain parallel to each other and then pressed at0.45 MPa. The press temperature and press time werefixed at 195 8C and 4 min, respectively. After bonding, theassemblies were conditioned in a Vo¨ tsch climate room(25 8C and 65% relative humidity) for 24 h. Bonding qualitywas evaluated from the percentage of wood failure at thebonding area and the shear strength of each specimen.Ten samples were tested of each formulation, with theaverage value being recorded.
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