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Microwaving trees speeds up coffee table production
September 12, 2004A new process for drying wood could revolutionise the timber industry and lead to cheaper timber for customers.
The process combines a new microwave technology with more traditional drying techniques, such as solar drying.
At present it can take a year or more to convert some Australian timber into top quality furniture or flooring. Much of this time is needed to dry the wood after it has been sawn.
The microwave technology, developed by a team in the Australian Cooperative Research Centre for Wood Innovations, could reduce the time needed to dry wood to just months or less.
"A brief burst of high powered microwave energy before drying drastically shortens solar timber-drying time without changing the visual appearance of the wood", said Mr. Graham Brodie, one of the CRC team.
Quicker drying means increased processing rate and reduced costs for the timber industry. These potential savings could be passed onto customers, making wood cheaper and more consistent in quality.
The work has been in progress for several years and members of the CRC team are currently running pilot microwave conditioning and drying trials on commercial timbers. "We hope that this technology will become a commercial reality soon," says Graham.
Wood contains millions of tiny cells, stacked together in long rows. These cells resemble little water filled straws. When green wood dries this water slowly leaks out of these straws. Because the walls of these wood cells are quite solid, the drying process can be very slow. It can take several months or even a year to dry some timbers properly.
"Intense microwaves raise the temperature of the wet wood so fast that the water inside the wood cells boils. The steam pressure blasts tiny holes through some of the wood cells to create better connections between the straws. These pathways make it much easier for moisture to escape. Most of these tiny pathways can only be seen under a microscope", says Graham.
Earlier experiments used a modified domestic microwave oven and a home made solar drier to treat small pieces of wood. The CRC microwave team has graduated to commercial scale microwave generators which are many times more powerful to treat much larger pieces of wood.
A new microwave generator is under construction and has 300 times the power of a domestic microwave oven.
The microwave treatment also makes the wood more permeable, making wood processing such as preservative treatment more rapid.
"Microwave processing allows timber to be impregnated with resins or preservative to improve its strength, stability and durability," says Professor Peter Vinden, CEO of CRC Wood Innovations.
"Microwave technology enables acceleration of preservative treatment to a few minutes, and generates a more environmentally friendly product."
Graham is presenting his work to the public and the media for the first time thanks to Fresh Science, a national competition that selects 16 of the best and brightest early-career scientists. The program is supported by the British Council Australia and the scientist that best meets the criteria of the program will go on a study tour of the UK where they will present their work.
Graham can be contacted at Melbourne University's Dookie Campus by telephone on +61 3 5833 9273 or by email at grahamb@unimelb.edu.au
Images are available online at www.freshscience.org
Science in Public
The microwave technology, developed by a team in the Australian Cooperative Research Centre for Wood Innovations, could reduce the time needed to dry wood to just months or less.
"A brief burst of high powered microwave energy before drying drastically shortens solar timber-drying time without changing the visual appearance of the wood", said Mr. Graham Brodie, one of the CRC team.
Quicker drying means increased processing rate and reduced costs for the timber industry. These potential savings could be passed onto customers, making wood cheaper and more consistent in quality.
The work has been in progress for several years and members of the CRC team are currently running pilot microwave conditioning and drying trials on commercial timbers. "We hope that this technology will become a commercial reality soon," says Graham.
Wood contains millions of tiny cells, stacked together in long rows. These cells resemble little water filled straws. When green wood dries this water slowly leaks out of these straws. Because the walls of these wood cells are quite solid, the drying process can be very slow. It can take several months or even a year to dry some timbers properly.
"Intense microwaves raise the temperature of the wet wood so fast that the water inside the wood cells boils. The steam pressure blasts tiny holes through some of the wood cells to create better connections between the straws. These pathways make it much easier for moisture to escape. Most of these tiny pathways can only be seen under a microscope", says Graham.
Earlier experiments used a modified domestic microwave oven and a home made solar drier to treat small pieces of wood. The CRC microwave team has graduated to commercial scale microwave generators which are many times more powerful to treat much larger pieces of wood.
A new microwave generator is under construction and has 300 times the power of a domestic microwave oven.
The microwave treatment also makes the wood more permeable, making wood processing such as preservative treatment more rapid.
"Microwave processing allows timber to be impregnated with resins or preservative to improve its strength, stability and durability," says Professor Peter Vinden, CEO of CRC Wood Innovations.
"Microwave technology enables acceleration of preservative treatment to a few minutes, and generates a more environmentally friendly product."
Graham is presenting his work to the public and the media for the first time thanks to Fresh Science, a national competition that selects 16 of the best and brightest early-career scientists. The program is supported by the British Council Australia and the scientist that best meets the criteria of the program will go on a study tour of the UK where they will present their work.
Graham can be contacted at Melbourne University's Dookie Campus by telephone on +61 3 5833 9273 or by email at grahamb@unimelb.edu.au
Images are available online at www.freshscience.org
Science in Public
Evolution Current Events and Evolution News RSSStudy Yields Clues About the Evolution of Epilepsy
Two children have a seizure. One child never has another seizure. Twenty years later, the other child has a series of seizures and is diagnosed with epilepsy. A study being led by researchers at Rensselaer Polytechnic Institute is looking at what could possibly happen in the development of these two children that would lead to such extreme variations in their neurologic health.
Plant polymerases IV and V are special forms of Polymerase II
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Research team reports how, when life on Earth became so big
In 3.5 billion years, life on earth went from single microscopic cells to giant sequoias and blue whales. Scientists have now documented quantitatively that the increase in maximum size of organisms was not gradual, but happened in two distinct bursts "tied to the geological evolution of the planet," said Michal Kowalewski, professor of geosciences at Virginia Tech.
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During gene transcription - the process inside the nucleus of cells by which DNA, the genetic material, is copied into RNA - a large, ever-changing multiprotein complex is enlisted to assist the DNA-copying enzyme in its challenging job.
No quick or easy technological fix for climate change, researchers say
Global warming, some have argued, can be reversed with a large-scale "geoengineering" fix, such as having a giant blimp spray liquefied sulfur dioxide in the stratosphere or building tens of millions of chemical filter systems in the atmosphere to filter out carbon dioxide.
Earth's original ancestor was LUCA, not Adam nor Eve
Here's another argument against intelligent design. An evolutionary geneticist from the Université de Montréal, together with researchers from the French cities of Lyon and Montpellier, have published a ground-breaking study that characterizes the common ancestor of all life on earth, LUCA (Last Universal Common Ancestor).
'Hobbit' fossils represent a new species, concludes University of Minnesota anthropologist
University of Minnesota anthropology professor Kieran McNulty (along with colleague Karen Baab of Stony Brook University in New York) has made an important contribution toward solving one of the greatest paleoanthropological mysteries in recent history -- that fossilized skeletons resembling a mythical "hobbit" creature represent an entirely new species in humanity's evolutionary chain.
First experimental evidence for speedy adaptation to pesticides by worm species
Scientists at the Instituto Gulbenkian de Ciencia (IGC) and the Faculty of Science of the University of Lisbon, in Portugal, have shown that populations of the worm Caenhorabditis elegans become resistance to pesticides in 20 generations, that is, in only 80 days.
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