Properties of moisture resistance kelempayan neolamarckia cadamba based plywood / Mohamad Sukri Mohd Nor Samawi

The purpose of this study was to evaluate the 3 ply plywood properties which
utilize combination of Kelempayan and tropical veneers in term of their physical
and mechanical properties. The Kelempayan species veneers used in this
experiment were distinguished by two timeline of exposure to the surround
environment. Another treatment applied to the plywood was the arrangement of
veneer layer. There are three types of veneer arrangement which are the
utilization of 100% veneer from Kelempayan, middle ply Kelempayan and middle
ply tropical. The plywood process is standardized by using Urea Formaldehyde,
hot pressed for 1808, and the glue spread value calculated for relevant surface
areas. A test on physical properties on substrate wettability and buffer capacity
was conducted prior to bonding. The Kelempayan veneers at 1 month and 3
month exposure pH are not significantly different. The tropical veneers are
significantly different with 4.2 ml at P s 0.05. Plywood made was evaluated
according to Japanese Agricultural Standard (JAS, 2014) for bending test,
tensile test and wood failure test. With regards to veneer age, the new
Kelempayan veneer and tropical species is not significantly different, but both of
them had significantly higher strength than the old veneer Kelempayan. For
arrangement there is a significant difference between the type of plywood
arrangement, whereby the best mechanical properties of plywood come from
middle ply Kelempayan with modulus of rupture 80.7 MPa and modulus of
elasticity 10898 MPa. This experiment suggest to industry to utilize new
Kelempayan veneer with a hybrid mix with tropical species veneer as the back
and the face for plywood production.