Abstract:
Waste sawn timber material in furniture factories and short length of sawn
timber are serious problems in timber industry. To further suggest ways to minimize
the waste, by applying a jointing system, this paper utilizes the finger-jointed tech niques. Using this method, waste timber planks, trimmings and edgings can be used
as finger-jointed boards and furniture in sustainable way. Finger joint technique is
also used to eliminate wood defects which weaken the strength of sawn wood planks.
Finger joint technology is used in structural and non-structural applications. Furniture
mainly belongs to non-structural category. This study was conducted to investigate
the best joint type for combining of the finger-jointed timber panel in board produc tion. Shear test was done to determine the most suitable joint type which could be
employed in combining two finger-jointed timber panels. Shear test was performed
for Pine—Pinus carebaea (soft wood) and Teak—Tectona grandis (Hard wood)
timber types. Clear specimens, butt-jointed and tongue and groove were tested in
the shearing apparatus. Eight test specimens of each timber specimens were used
to obtain shear strength perpendicular to grains with 0.5 mm/min loading rate was
applied using a Universal Testing Machine. Shear strength of Teak specimens with
tongue and groove is higher than Teak specimens with butt joint, because bonding
area of the tongue and groove specimens is higher than bonding area of the butt jointed specimens. Specimen part with tongue of Pine is weaker than corresponding
part of butt-jointed Pine specimen due to small cross-sectional area of tongue. So,
Shear strength of Pine specimen with butt joint is greater than Pine specimen with
tongue and groove.