Featured Research

from universities, journals, and other organizations

New Way To Preserve Wood

Date:
January 8, 2001
Source:
CSIRO Australia
Summary:
A new preservative treatment method that uses supercritical carbon dioxide (CO2) to carry preservatives into wood is being developed in Australia.

A new preservative treatment method that uses supercritical carbon dioxide (CO2) to carry preservatives into wood is being developed in Australia.

"The technique employs 'supercritical' carbon dioxide to spread preservative through the wood," says Dr Abdul Qader, who leads the research at Australia's public research organisation, CSIRO.

"Like other gases, carbon dioxide enters a supercritical phase when subjected to pressures and temperatures beyond a 'critical' point. A key change is that it acquires a liquid-like ability to dissolve compounds. At the same time it retains a gas's ability to penetrate fine structures such as the micropores of wood, unrestricted by the high surface tension associated with liquids", says Dr Qader.

"Unlike conventional dipping and pressurised treatment procedures that use preservative dissolved in water or oil, it should allow effective treatment of hardwoods such as messmate eucalypts and difficult softwoods such as cypress pine," he says.

Research on the possible use of supercritical fluid to spread termite- and fungus-resistant preservatives through the fine structure of wood is now under way in the US and Europe, as well as Australia.

In small-scale tests, Dr Qader has found supercritical CO2 treatment gives much better preservative penetration and retention than conventional techniques. Samples treated include messmate eucalypt timber and the reconstituted products laminated veneer lumber (LVL) and medium density fibreboard (MDF).

Tests on larger samples are planned for early this year following the installation of new equipment. CSIRO is seeking industry involvement in further development of the technique.

"Because of the high pressures required - CO2 becomes supercritical above 72.9 atmospheres pressure (about 1070 psi) and 31.1C - the capital cost of treatment facilities will be considerably higher than for conventional processes. However, operating costs will be lower," says Dr Qader.

CSIRO has applied for patent protection as the technique appears to offer significant environmental and economic benefits.

Major benefits are greater preservative penetration, the ability to provide effective treatments for wood that is not amenable to conventional application methods, no requirements for drying and stock holding after the treatment. The process also eliminates the problems associated with residual solvent in wood treated using solvent-based techniques. In the new process, the CO2 reverts to its gaseous state and dissipates when the pressure falls after treatment, leaving the preservative behind in the wood.

Qader says products likely to be prime candidates for the new treatment include window and house frames, LVL, decking, hardwood flooring and particleboard.


Story Source:

The above story is based on materials provided by CSIRO Australia. Note: Materials may be edited for content and length.


Cite This Page:

CSIRO Australia. "New Way To Preserve Wood." ScienceDaily. ScienceDaily, 8 January 2001. <www.sciencedaily.com/releases/2001/01/010107224343.htm>.
CSIRO Australia. (2001, January 8). New Way To Preserve Wood. ScienceDaily. Retrieved August 27, 2014 from www.sciencedaily.com/releases/2001/01/010107224343.htm
CSIRO Australia. "New Way To Preserve Wood." ScienceDaily. www.sciencedaily.com/releases/2001/01/010107224343.htm (accessed August 27, 2014).

Share This




More Plants & Animals News

Wednesday, August 27, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Super Healthful Fruits and Vegetables: Which Are Best?

Super Healthful Fruits and Vegetables: Which Are Best?

Ivanhoe (Aug. 27, 2014) We all know that it is important to eat our fruits and vegetables but do you know which ones are the best for you? Video provided by Ivanhoe
Powered by NewsLook.com
Panda Might Have Faked Pregnancy To Get Special Treatment

Panda Might Have Faked Pregnancy To Get Special Treatment

Newsy (Aug. 27, 2014) A panda in China showed pregnancy symptoms that disappeared after two months of observation. One theory: Her pseudopregnancy was a ploy for perks. Video provided by Newsy
Powered by NewsLook.com
Raw: Firefighters Rescue Puppy Stuck in Tire

Raw: Firefighters Rescue Puppy Stuck in Tire

AP (Aug. 26, 2014) It took Houston firefighters more than an hour to free a puppy who got its head stuck in a tire. (Aug. 26) Video provided by AP
Powered by NewsLook.com
Have You Ever Been 'Sleep Drunk?' 1 in 7 Has

Have You Ever Been 'Sleep Drunk?' 1 in 7 Has

Newsy (Aug. 26, 2014) A study published in the journal "Neurology" interviewed more than 19,000 people and found 15 percent suffer from being "sleep drunk." Video provided by Newsy
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:

Breaking News:
from the past week

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile: iPhone Android Web
Follow: Facebook Twitter Google+
Subscribe: RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins