4
1.4 Research Benefits
Utilization of fast growing species especially, sengon, jabon, poplar and douglas-fir for LVL production can help to solve the problems linked to the
shrinkage of raw material and to the protection of natural forest. This study would increase fast growing species added values. In details, research advantages were
as follow: 1. In term of wood science development, segmented regression model can be
used to determine demarcation pointtransition age between juvenile and mature wood in fast growing wood species hardwood and softwood.
2. Boiling treatment prior to sengon and jabon peeling can be applied to increase veneer qualities in wood industries.
3. LVL made of fast growing wood species can be used for light construction in society.
4. A new analytical model can be applied to determine the variation of specific MOE LVL values from pith to bark in wood science.
1.5 Research Stages
In order to accomplish the objectives of the research, this study was divided into four stages. The stages of the research are shown in Table 1.
Table 1 Research stages No.
Research Stages Parameters
1. Determination of demarcation point
transition age between juvenile and mature wood
Parameters that were measured on solid wood : density, fiber length,
microfibril angle, MOE and MOR
2. The effect of juvenility on veneer
lathe check and surface roughness of fast growing wood species
Parameters that were measured on veneer : lathe check frequency,
depth and
length, surface
roughness and contact angle 3.
The effect of lathe check and juvenility on fast growing species
LVL glue bond and bending strength Parameters that were measured on
LVL : glue bond strength, MOE by non destructive and destructive test
and MOR
4. Determination of sengon and jabon
LVL specific modulus of elasticity by modelling peeling an evolution of
raw material properties on segmented ring basis
Parameters that were measured : specific MOE of experimental data
and model
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