The Effects of Heat Treatment with the ThermoWood® Method on the Equilibrium Moisture Content and Dimensional Stability of Wild Cherry Wood

Maritime pine (Pinus pinaster) wood has low dimensional stability and durability. Heat treatment was made in an oven using hot air during 2 to 24 h and at 170-200 ºC. A comparison was made against steam heat treatment. The equilibrium moisture content and the dimensional stability (ASE) in radial and tangential directions were evaluated at 35%, 65%, and 85% relative humidity. MOE, bending strength and wettability were also determined. At the same mass loss, improvements of equilibrium moisture content and dimensional stability were higher for oven heat treatment, but the same was true for mechanical strength degradation. A 50% decrease in hemicellulose content led to a similar decrease in bending strength.

Download Full-text

Effects of Heat Treatment on the Color Change and Dimensional Stability ofGmelina arboreaandMelia azedarachWoods

E3S Web of Conferences ◽

10.1051/e3sconf/20186803010 ◽

2018 ◽

Vol 68 ◽

pp. 03010

Author(s):

Wahyu Hidayat ◽

Fauzi Febrianto ◽

Byantara Darsan Purusatama ◽

Nam Hun Kim

Keyword(s):

Heat Treatment ◽

Moisture Content ◽

Water Absorption ◽

Equilibrium Moisture Content ◽

Dimensional Stability ◽

Color Change ◽

Value Added ◽

Treatment Temperature ◽

Melia Azedarach ◽

Color Properties

This study aimed to improve the color properties and dimensional stability of gmelina (Gmelina arborea) and mindi (Melia azedarach) woods via heat treatment. Heat treatment was conducted using an electric furnace at 180°C and 210°C for 3 h, with a heating rate of 2°C/min. Wood samples were stacked with and without metal clamp. The effectsof temperature and clamping during heat treatment on the color change and dimensional stability were evaluated. The evaluation of color change was performed using the CIE-Lab color system and the evaluation of dimensional stability was conducted by measuring the equilibrium moisture content and water absorption. The results showed that the overall color changes(ΔE*) in gmelina and mindi woods were mainly affected by the reduction in lightness (L*) due to heat treatment. TheΔE*increased with increasing treatment temperature, with a higher degree obtained in gmelina wood. Application of metal clamp during treatment limited the exposure of wood surface to the heated air, resulting in lower value ofΔE*than the samples without metal clamp. Dimensional stability of gmelina and mindiwoods improved by heat treatment, showing lower equilibrium moisture content and water absorption than the untreated woods. Furthermore, heat treated mindi absorbed less water than gmelina. The results suggested that heat treatment could enhance the color properties and dimensional stability of gmelina and mindi woods for value added products.

Download Full-text

Improvement of White Spruce Wood Dimensional Stability by Organosilanes Sol-Gel Impregnation and Heat Treatment

Materials ◽

10.3390/ma13040973 ◽

2020 ◽

Vol 13 (4) ◽

pp. 973 ◽

Cited By ~ 1

Author(s):

Diane Schorr ◽

Pierre Blanchet

Keyword(s):

Heat Treatment ◽

Moisture Content ◽

Dimensional Stability ◽

Morphological Changes ◽

Sol Gel ◽

White Spruce ◽

Water Vapor Sorption ◽

Green Wood ◽

Spruce Wood ◽

Gel Treatment

Wood is a living material with a dimensional stability problem. White spruce wood is a Canadian non-permeable wood that is used for siding applications. To improve this property, white spruce wood was treated with organosilanes sol-gel treatment with different moisture content (oven dried, air dried, and green wood). No major morphological changes were observed after treatment. However, organosilanes were impregnated into the cell wall without densifying the wood and without modifying the wood structure. Si-O-C chemical bonds between organosilanes and wood and Si-O-Si bonds were confirmed by FTIR and NMR, showing the condensation of organosilanes. The green wood (41% moisture content) showed only 26% dimensional stability due to the presence of too much water for organosilanes treatment. With a moisture content of 14%–18% (oven dried or air dried wood), the treatment was adapted to obtain the best improvement in dimensional stability of 35% and a 25% reduction of water vapor sorption. Finally, impregnation with organosilanes combined with the appropriate heat treatment improved the dimensional stability of white spruce wood by up to 35%. This treated Canadian wood could be an interesting option to validate for siding application in Canada.

Download Full-text

Effect of heat treatment on equilibrium moisture content of Southern pine

10.13031/aim.20131594244 ◽

2013 ◽

Author(s):

Manunya - Phanphanich ◽

Tyler L Westover

Keyword(s):

Heat Treatment ◽

Moisture Content ◽

Equilibrium Moisture Content ◽

Southern Pine

Download Full-text

Dimensional Stability of High Temperature-Dried Rubberwood Solid Lumber at Two Equilibrium Moisture Content Conditions

Drying Technology ◽

10.1080/07373937.2010.506162 ◽

2010 ◽

Vol 28 (9) ◽

pp. 1083-1090 ◽

Cited By ~ 10

Author(s):

Huei Shing Sik ◽

Kheng Ten Choo ◽

Sarani Zakaria ◽

Sahrim Ahmad ◽

Seok Sean How ◽

...

Keyword(s):

High Temperature ◽

Moisture Content ◽

Equilibrium Moisture Content ◽

Dimensional Stability

Download Full-text

Modifications of Physical and Mechanical Characteristics Induced by Heat Treatment: Case Study on Ayous Wood (Triplochiton scleroxylon K. Schum)

Environmental Sciences Proceedings ◽

10.3390/iecf2020-07874 ◽

2020 ◽

Vol 3 (1) ◽

pp. 27

Author(s):

Emiliano Gennari ◽

Rodolfo Picchio ◽

Damiano Tocci ◽

Angela Lo Monaco

Keyword(s):

Heat Treatment ◽

Moisture Content ◽

Equilibrium Moisture Content ◽

Mechanical Characteristics ◽

Bending Strength ◽

Basic Density ◽

Untreated Wood ◽

Thermal Modification ◽

Biological Origin ◽

Physical And Mechanical Characteristics

Wood is a material of biological origin of fundamental importance for artisan and industrial uses. In outdoor environments, it is very attractive, but easily subjected to degradation. A valid alternative to chemical preservatives is thermal modification. The aim of this study is to evaluate ayous wood industrially subjected to thermal modification (215 °C) in order to emphasize the influence of heat treatment on selected physical and mechanical characteristics. As a result of the heat treatment, the physical and mechanical properties are generally reduced: the density in natural wood (TQ) was 379 kg/m3, in heat treated wood (TT) 319 kg/m3; the basic density in TQ was 327 kg/m3, in TT 299 kg/m3; the axial compression strength of TT was reduced by 18.1%; and the static bending strength of TT was reduced by 41.4% compared to untreated wood at 10% equilibrium moisture content (EMC). In addition, the samples, under the same environmental conditions in the laboratory, reached the equilibrium moisture content of 10% in TQ and 4% in TT.

Download Full-text

Analysis of the moisture content of maize kernels in over-ripe plants

Acta Agronomica Hungarica ◽

10.1556/aagr.54.2006.4.5 ◽

2006 ◽

Vol 54 (4) ◽

pp. 425-430

Author(s):

T. Árendás ◽

L. C. Marton ◽

P. Bónis ◽

Z. Berzsenyi

Keyword(s):

Linear Regression ◽

Moisture Content ◽

Grain Yield ◽

Equilibrium Moisture Content ◽

Weather Conditions ◽

Positive Correlation ◽

Maize Grain Yield ◽

Maize Grain ◽

Maize Kernels

The effect of varying weather conditions on the moisture content of the maize grain yield was investigated in Martonvásár, Hungary from late August to late September, and from the 3rd third of September to the 1st third of Novemberbetween 1999 and 2002. In every year a close positive correlation (P=0.1%) could be observed between the moisture content in late September and the rate of drying down in October. Linear regression was used each year to determine the equilibrium moisture content, to which the moisture content of kernels returned if they contained less than this quantity of water in late September and harvesting was delayed. In the experimental years this value ranged from 15.24-19.01%.

Download Full-text