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20 June 2018no password?
Articles & News
The most celebrated projects at Wood Design Awards
Just five hours to mount a prefabricated house
THE SALES OF WOOD PROCESSING MACHINERY AND INTERMOB FAIRS ARE ON ITS WAY
German forests will be used much more as energy sources in the future
What is the difference between "wild forest wood" and plantation wood
Forests will become an invaluable "carbon sink"
Could wood be a key sustainable resource of our future?
Fireplaces - the heart of a home
Vietnam`s wood exports are predicted to reach $7.6 billion
Officials of the Forestry Commission have intensified their fight against deforestation
New type of wood - stronger than steel
A chemical bath and a hot-press can transform wood into a material that is stronger than steel, researchers report. The process, and others like it, could make the humble material an eco-friendly alternative to using plastics and metals in the manufacture of cars and buildings. Li`s team took a different approach: the researchers focused on modifying the porous structure of natural wood. First, they boiled different wood types, including oak, in a solution of sodium hydroxide and sodium sulfite for seven hours. That treatment left the starchy cellulose mostly intact, but created more hollow space in the wood structure by removing some of the surrounding compounds. These included lignin, a polymer that binds the cellulose. Then the team pressed the block like a panini sandwich at 100 ēC for a day. The result: a wooden plank one-fifth the thickness, but three times the density of natural wood and 11.5 times stronger. Previous attempts to densify wood have improved the strength by a factor of about three to four2. To test the toughness of the material, the team fired pellets at it from a ballistic air gun normally used to test the impact resistance of military vehicles. Five layers of the material laminated together just 3 millimetres thick in total was able to halt a 46-gram steel projectile travelling at roughly 30 metres per second. Source article: https://www.nature.com Source image: https://www.sciencealert.com
March 09, 2018