Friday, January 15, 2016
Records from 1600 BC
tell us that latex from a type of rubberwood tree was already used then for different
The discovery of the rubber-sulfur reaction process called vulcanisation
and the added strength it gave rubber created the compound that has fuelled the
global industrialisation process.
The steady increase in the world-wide demand for rubber that leapfrogged with the advent of the internal combustion engine saw rubber manufacturers combing the globe for suitable rubber wood production sites that could support the growth of rubber wood trees. Liberia’s location, soil and climatic conditions quickly made
it the focus of the largest natural rubber production operation in the world.
Rubber production in Liberia continued unabated until
the 1980s when synthetic compounds that replaced natural rubber and political instability in Liberia curbed rubber production activities there.
The end of the first and second Civil War in Liberia in 2003 saw a speculative return of rubber producers to the country where big reserves of large diameter rubberwood trees that have reached
the end of the rubber production lifespan were now available for furniture and
flooring production purposes.
Rubberwood trees are felled at 25-30 years when the
end of the latex production cycle is reached.
The timber that then becomes available when the
tree is cut down can be used for manufacturing and new plantations can be
planted. This makes rubberwood a completely sustainable agroforestry crop.
The revival of the rubber production industry in the country also sparked
renewed interest from private growers eager to get back into the rubber industry.
The large volumes of big diameter rubberwood logs
that suddenly became available presented a problem but also massive
The problem was that old sawmills from the 1950s could
not process the log volumes and diameters found in Liberia fast and efficiently
enough to make the operation financially successful. This saw the standing trees or logs that were available going
to waste through insect attack or disease.
The commercial opportunity that the large areas of
rubberwood in Liberia presented was considerable.
Rubberwood is a fined-grained and easily worked
timber that furniture and flooring producers are willing to pay a premium for.
This together with the wide board sizes that the big diameter logs in Liberia provide,
saw customers lining up.
The key to ensuring the success of any sawmilling
venture that wanted to turn the rubberwood into sawn boards was simple.
Invest in sawmilling technology that could deliver
the output required in the most efficient manner possible, this in turn
providing for large profit margins that were guaranteed to make the operation financially
Wood-Mizer sawmilling tech the solution
In 2007 a
trained agronomist* and former employee of a major rubber producer in Liberia then resident in Israel
received a call from Liberia’s 24th President, Ellen
The request was simple.
Return to Liberia and assist with
rebuilding the country’s economy that was in left in tatters after the civil
war ended in 2003.
A biomass energy project also headed up
by the agronomist in 2008 proved to be a false start. It did however reveal the
growth in the revived rubber industry and the potential that it held to
generate income from exports of rubberwood.
An initial start in 2012 to cut
rubberwood with old sawmilling technology prompted a search for alternatives as
the weaknesses of the old systems became clear. The main requirements were to
find affordable technology with high output and large diameter processing
capacity, low energy and labour costs, less wastage and better use of available
timber, affordable and easy to maintain blade technology and reliable
A chance meeting in Thailand in 2013 between
the agronomist and Wood-Mizer’s Regional Manager for Asia James Wong, resulted
in the first Wood-Mizer LT20 being commissioned in the same year to cut large
diameter rubberwood logs into sawn material in Liberia.
The plan was to use the LT20 to cut the logs
into 300 x 300 mm blocks that were then fed to a Wood-Mizer HR500 four-head
resaw that was also bought in 2013 to cut the blocks into boards. The HR500
resaw line can expand from a minimum of one head to a maximum of six heads, this
allowing for six boards and one slab to be produced in one pass.
This setup was so successful that a second
Wood-Mizer LT20 followed in 2014 to produce more blocks for the HR500 resaw
The successes of the first Wood-Mizer line
and the need to increase output further saw a second Wood-Mizer line going into
operation in early 2014.
The second line from Wood-Mizer’s Green
Industrial product range is used for log diameters of <400 mm. The line
consists of a Wood-Mizer TVS (Twin Vertical Saw) primary breakdown headrig that
initially squares the log, where after a SVS (Single Vertical Saw) cuts a third
side before the cant passes through a second four-head HR500 resaw bought in
A third LT20 that feeds into a third
sawmill line is already in the planning stages.
The final piece of the puzzle fits into
place when two Wood-Mizer EG300 board edgers split the insect treated and dried
boards into the final 210 x 700 x 1100mm board size.
The Wood-Mizer line running in Liberia exceed
the output that larger and more expensive to buy and operate mills can produce.
Current output from the mill is close to
40 cubic meters per day with room for expansion. Low electricity and labour
costs increases profit margins further.
Wood-Mizer’s entire sawmill range is modular.
This simply means that each sawmill can produce final size boards if required, but
if sawmillers want to expand and improve production further machines can be
added to increase production. This is what the mill owners in Liberia did.
They first tested the market and bought
equipment that they could afford. Improved finances and more customers saw them
increasing production by buying machines that were then slotted into the line.
Wood-Mizer is also the only sawmill
manufacturer that produces a full range of blades for specific species and
cutting conditions. A full range of blade sharpening and setting units makes it
possible for sawmillers to maintain their own blades for up to 30
re-sharpenings. This reduces running costs further.
sensitivity of the Liberian rubberwood production industry does not allow
Wood-Mizer Africa to divulge the identity of the producer reported on. Please
contact firstname.lastname@example.org for further details.
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