In certain areas around the world, wood from local saw- mills is not really available for the furniture production. It has to be imported, even crossing oceans. In this case, wood comes quite usually cut and milled to standardized dimensions, dried to some ± 8% moisture content (m/c). The question is, is it possible to bend dry hardwood with good results, no matter if this is kiln dried, pre-bend (no matter if this happened recently or hundreds of years ago)? This question is quite important given that there is a high interest to introduce Solid Wood Bending as a production process to countries that do not have relevant wood sources at their doorstep for their furniture production. Based on the today established understanding that wood has visco-elastic and visco-plastic properties, it is suggested, that wood can be re-softened and then be bend. On the other side, there are theories about the role of lignin to resist compressive forces and its behavior after wooden parts have been initially dried below a m/c of 10%. In that case, the question is, to what extend does the behaviour of lignin influence the re-softening and bending process to eventually bend dry-aged, kiln dried or previously bend wooden parts in whatever direction? To understand the influences of the different softening processes, samples of kiln-dried wood were softened and bend. The test criteria were the quality of a typical bend part in U-shape for a standard chair frame.

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Steam Softening for Solid Wood Bending, Focussing on Kiln Dried Lumber

  • Otto Eggert

摘要

In certain areas around the world, wood from local saw- mills is not really available for the furniture production. It has to be imported, even crossing oceans. In this case, wood comes quite usually cut and milled to standardized dimensions, dried to some ± 8% moisture content (m/c). The question is, is it possible to bend dry hardwood with good results, no matter if this is kiln dried, pre-bend (no matter if this happened recently or hundreds of years ago)? This question is quite important given that there is a high interest to introduce Solid Wood Bending as a production process to countries that do not have relevant wood sources at their doorstep for their furniture production. Based on the today established understanding that wood has visco-elastic and visco-plastic properties, it is suggested, that wood can be re-softened and then be bend. On the other side, there are theories about the role of lignin to resist compressive forces and its behavior after wooden parts have been initially dried below a m/c of 10%. In that case, the question is, to what extend does the behaviour of lignin influence the re-softening and bending process to eventually bend dry-aged, kiln dried or previously bend wooden parts in whatever direction? To understand the influences of the different softening processes, samples of kiln-dried wood were softened and bend. The test criteria were the quality of a typical bend part in U-shape for a standard chair frame.