Wednesday, 10 August 2016

INCREASED MOISTURE-RELATED DIMENSIONAL STABILITY



Firstly, lets take a look at the definition here.
Definition:

"Dimensional Stability is a measurement of the linear dimensional change resulting from exposure to temperature. The test gives an indication of lot-to-lot uniformity with regards to internal stress introduced during processing. The test is mostly used for sheeting or film made by extrusion or calendar processes." Intertek.com


Thermowood remains dimensionally stable as the seasons change when compared to untreated or chemically treated wood. The dimensional stability of wood due to varying air humidity clearly increases in thermal modified products. This is due to the reduction of wood shrinkage, lower moisture content and slower absorption of humidity because of thermal modification.

The higher the temparature used for thermal modification, the more the dimensional stability of thermally modified wood is increased. Even in low degrees of heat treatment (T4,T5) the dimensional stability is increased by about 20 %. In the level of D1 thermowood, the dimensional stability is increased to about 20-90 % higher than that of untreated wood. D1 is especially suited for outdoor applications.

In developing wood products, such as doors, windows and floors, thermally modified wood offers a good option as raw material for applications where the reduced swelling and shrinking of wood brings significant benefit to both manufacturer and for the end user.
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