Mould growth on kiln-dried and air-dried timber

Johansson, Pernilla; Wamming, Thomas; Bok, Gunilla; Edlund, Marie-Louise

doi:10.1007/s00107-013-0699-y

Cited by 6 publications

(2 citation statements)

References 7 publications

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“…Chemical analyses of monosaccharide sugar gradients beneath the boards' surfaces confirmed these results [106]. Others have noted a clear difference in discoloring mold fungus between wood dried at room temperature and kiln-dried wood [107].…”

Section: Resistance To Mold and Biodegradationmentioning

confidence: 68%

A Decade of Improved Lumber Drying Technology

Bond

Espinoza

2016

Curr Forestry Rep

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In this paper, we comprehensively review the relevant literature published from 2005 to 2016, focused on lumber drying and provide a summary of where we feel future research will focus. Drying is a critical part of most wood products manufacturing process, and the methods used and proper control are key to achieving the appropriate production level, quality, and costs. While a combination of drying methods may be used, most lumber is dried in a kiln at some point in the process. The most common commercial kilns can be classified as conventional, high temperature, and vacuum; however, there continues to be some interest in solar and compression drying. While no new drying technologies have been proposed, work has continued on improving the existing methods. Control of the drying process varies with the type of kiln used, the species being dried and the temperatures used in the process; however, it usually involves some type of measurement of the moisture content of the wood being dried. The development of new methods for controlling the drying process focuses on new ways to measure moisture content or moisture content variation, temperature drop across the load, and drying stresses. While wood quality can be defined differently by its various users, for example, industrial or end users, certain aspects of quality remain constant across these groups, such as minimizing warp, checks, and splits, and discoloration, and maintaining or enhancing mechanical properties. New schedules have been proposed to increase drying rate and improve drying quality. Methods to reduce drying defects and improve its quality have focused mainly on mechanical restraint to prevent warp, better understanding of defect formation, and pre-treatments to speed up the drying process or reduce final moisture content variation. Finally, concerns regarding the environmental impacts of wood drying, most importantly the high energy demands and emissions, have increased in importance as concerns about sustainability and health issues become more mainstream.

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Section: Resistance To Mold and Biodegradationmentioning

confidence: 68%

A Decade of Improved Lumber Drying Technology

Bond

Espinoza

2016

Curr Forestry Rep

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“…Seven boards were used to prepare test specimens measuring 110 × 40 × 10 mm (EN 152). During the specimen preparation, all the original surfaces of the boards were removed by planning to ensure that the exposed surfaces were free of extra nutrients resulting from the migration of the extractives to the surface due to kiln-drying [34,35]. One specimen from each board was allocated to each test ensuring similar sets of wood substrate for all experiments.…”

Section: Methodsmentioning

confidence: 99%

Conditions Influencing Mould Growth for Effective Prevention of Wood Deterioration Indoors

et al. 2022

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Effective prevention of mould growth indoors is still an important topic considering that mould growth is frequently observed in buildings, it causes serious health hazards and can irreversibly damage infected objects. Several studies have been conducted and mould growth models developed. Despite that, some potentially important aspects such as water damage and spore contamination have received only little attention. The objective of the present study was to investigate the effect of the initial moisture content of wood and spore contamination on mould development indoors. The mould tests were performed in constant temperature (10, 20 and 30 °C) and relative humidity (91% and 97%) conditions. The results show that wetting of wood specimens prior to the test significantly accelerates mould growth at a temperature of 10 °C. For the other temperatures, the effect was insignificant. Similar results were obtained for the test involving dry (conditioned at RH 50%) and conditioned specimens (RH 91% or RH 97%). The results regarding initial spore contamination show that significantly longer periods are required for mould to develop without spore contamination at 10 °C and 20 °C, while at 30 °C the effect is relatively small.

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