HARVESTER HEADS
clearing The Mense RPK energy wood harvesting head
working width of 900 mm and consisting of two blades moving back and forth, a multi- stemming grapple and chain saw. The clearing blade is mounted underneath the chain saw. The blade for cutting branches allows minor earth contacts and can therefore be used on rocky ground as well. The harvester head designed for professional use weighs about 850 kg. Its oil consumption is 150 litres/minute and it requires a working pressure of 200 bar. The clearing blade moves below the
harvester head sideward as well. The blade can be locked in sideward position allowing the
Powering multi-stem
harvesting Multi-limb harvesting was introduced in the 1990s as a method of improving efficiency. A multi-limb harvester head is usually equipped with an accumulator that consists of two arms that grab and hold the stem while the next is grabbed and cut. Since then, not only the technology has developed but also, due to an
increasing demand for biofuel, a change of direction in the use of multi- limb harvesting has taken place. Thinning has been of most interest since the method of multi-limb
functions to be carried out without the collecting feature. The same machine can therefore be used for advance
clearing and collecting energy wood at the same time.
An international patent has been applied for on this invention. The MenSe clearing blade can be installed as an attachment to nearly all harvesting heads on the market.
The Naarva EF28 is a feeding energy wood head optimised for energy wood harvesting, first thinning, and integrated harvesting. It is the
The Naarva EF28
harvesting has improved the efficiency as both debranching and cutting of several trees can be executed simultaneously. This has become particularly true with better technology, as the debranching of spruce has been improved together with better accumulation systems so different diameters of trees can be picked as well as an increased stem capacity. Since the biofuel revolution, we have also seen a change in attitude. Using trees for biofuel was previously seen as something to add value from thinning stands but its worth has significantly increased in recent times. The reason: biofuel is not as sensitive to changes in the market price as pulpwood and timber. This means that the entrepreneurs have a better all round use of their machines and therefore the pay-off time of investments is reduced.
A multi-stem harvester powered by a Poclain hydraulic engine
At the heart of many bioenergy heads is a Poclain hydraulic motor, which deals better with bark so the wood dries quicker with higher energy content as the result. Poclain motors assist heads in folding the branches for better compactness, which aids efficient transportation rather than just trimming the stem.
first model designed as a cooperation project between Pentin Paja and Outokummun Metalli. Together these companies have extensive expertise in energy wood harvesting equipment and harvester heads. The product is manufactured at Outokummun Metalli’s production facility in Outokumpu. The Naarva EF28 has been designed to meet the most current requirements in energy wood and small wood harvesting and handling. The compact grapple is capable of cutting and accumulating, delimbing in bunches, length measuring and cutting, and loading. Outstanding bundle feeding and delimbing properties makes it different from any challengers in the market. The efficiency of multi-tree handling is at the top end of energy wood heads. The feeding rollers open sideways up to 730 mm, making it easier to collect the next stem. The risk of slippage during the feeding is eliminated because the motors have been connected in series. The high- capacity accumulating grippers, reliable guillotine, and loader grapple type delimbing blades facilitate quick and easy accumulation. Excellent stability in the upright position supports productive multi-tree handling.
The 591 LX from SP Maskiner seen here in Brazil during Expoforest has been proven over three years of operation in South Africa, with the prototype still running and having already racked up more than 22,000 hours. “We are now confident about its performance and reliability and look forward to entering the Brazilian market with this head as a eucalyptus-dedicated debarking product,” Export Manager Anders Gannerud said. Since launching the SP 591 LX globally in 2010, SP has
delivered into, or has orders from, markets such as Chile, Uruguay, Argentina, Mexico, Spain, South Africa and Australia. *IFI is currently working on an Innovation feature focused on the SP 591 LX to continue with our Brazil/eucalyptus coverage
44 International Forest Industries | AUGUST/SEPTEMBER 2011
In this new innovative guillotine model, the grippers press the tree against the blade with one smooth movement, which speeds up the work. Cutting is quick and the blade cuts through the entire tree. Due to the unique structure, full cutting power is maintained throughout the entire movement. In case of tree bundles, this means that full cutting power is maintained from the first to the last tree in the bundle. The technology of the grapple is
reliable and care-free for the operator and includes the guillotine cutting, reliable and user-friendly automatics, and smartly designed
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