Effect Of Process Variables On The Strength Properties Of Veneer Laminated Cement Bonded Particle Board From Mixed Tropical Hardwoods

ABSTRACT

Modulus of Rupture (MOR) and Modulus of elasticity (MOE) of veneer laminated

wood cement panel were evaluated. the boards were made of 3 layers comprising .

1.5 mm thick mixed hardwoods sawdust for the two surfaces, and 9mm thick core

layer made of plantation grown Gmelina arborea flakes. Three varjabIes were investrgated

namely: .Demity at three lev& (1000 w31,10 0kg/m3a nd 1200 kgl

m3), Cam& wood ratios of2,5:1.0,2.75:I.O and 3.0:l.O and glue spread of 1.02

kgh2, 1.43 kg/m2 and 1,74 kglm2 double due line @GL) for the boards

1amination.For all the treatment combhatiom, the the MOR ran@ fmm 26.79

Nlmm to 42.59 N/mm2 while for MOJ3, the mean vafue was in the range of 3 1 14NI

mm2 to 53ION/mm2. At board deasity level of 1250 l@m3 the laminated panels

gave value of the &kt MOR and MOE. Statistical analysis showed that the three

variables considered in this study had significant on the board strength.