Wood Preparation – Machining2018-08-15T09:09:28+00:00



Wood Preparation / Treatment

Microwave technology is not a common method to dry the wood, but it is absolutely more efficient comparing to the other drying methods such as conventional drying methods. By the way, microwave drying doesn’t change mechanical properties of wood badly, unlike it can change in a good way. According to test performed, [1] wood’s bending strength, hardness and color showed no difference with the traditional conventional air circulation method. In fact, if the moisture content is in lower levels wood’s hardness becomes higher during microwave drying. Energy-cost can get %75 less and productivity can get %80 larger than other methods. [2] At the same time, microwave drying is cheaper compared to other methods.

Figure 1 A wood sample drying on a microwave oven

Briefly sawn wood should be dried before making furniture, structures, and so forth., since a living tree has a dry-weight moisture content (mc) regularly surpassing 0.8. For whatever length of time that individuals have utilized wood, man has endeavored to dry it. Before all else wood was most likely just dried with the assistance of air and sun; amid the most recent century there has been a consistent improvement in artificial drying. The most widely recognized drying technique these days is air-flow drying. This drying depends on warm conduction from the surface of the wood towards the inside for dissipation of moisture.

But microwave technology works exactly the opposite, it keeps wood from breaking and contracting, and adjust moisture point. The wood or timber is averagely and consistently vanished by the microwave burrow dryer. After the microwave drying technique, the presence of wood still has unique base. And in this way, it does not cause any change in the outer structure of the material. Microwave additionally empower to sanitize woodworm and hatchling to guarantee wood condition. [3] Extreme microwaves raise the temperature of the wet wood so quick that the water inside the wood cells bubbles. The steam weight shoots small openings through a portion of the wood cells to make better associations between the straws. These pathways make it significantly less demanding for moisture to get away. A large portion of these little pathways must be seen under a microscope (Graham,2014). [4]

The drying technique, paying little mind to whether it is microwave drying or air-course drying, has appeared to have no effect on wood strength during controlled drying conditions. Color changes are ordinarily unavoidable in traditional drying, and the reason is accepted to be a mix of drying time and temperature levels amid the diverse drying stages. Truth be told, drying wood with microwave vitality causes no color change, which is certain, as there is an interest for pale items in a few nations. In the furniture and deck businesses, where items made of hardwoods are normal, the color of wood is essential.

Since displaying is a decent apparatus to use for clarifying and understanding the microwave warming and drying process, it would be a test to make a microwave drying model that includes a multiphase stream, i.e., water stream in fluid and gas shape. Another plausibility is build up the model by including warm runaway. Such a total model ought to likewise be reason for future planning of the microwave drying process. Moreover, it is fascinating to examine the impacts of microwave warming and drying on remote wood species, aside from the Nordic sorts of wood, i.e., how the properties, for example, mechanical and shading properties would be influenced. The improvement of a warming and drying model for outside species with shifting fluid porousness would likewise be a valuable advance. Finally, an essential advance is build up a sensor framework for estimating mc without interfering with the drying procedure, i.e., a framework for controlling the drying process adaptively.


[1] https://www.diva-portal.org/smash/get/diva2:999526/FULLTEXT01.pdf

[2] http://processtechnologies.org.uk/wood/

[3] https://www.maxindustrialmicrowave.com/industrial-microwave-for-wood-p-8.html

[4] https://www.theengineer.co.uk/issues/september-2004-online/wood-gets-microwave-treatment/