Application of the steaming step during kiln drying of lumber of two tropical species with high growth stress presence

Moya, Róger

doi:10.1080/07373937.2021.2017299

Cited by 7 publications

(4 citation statements)

References 28 publications

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“…The proportion of collapse occurred for 7.3% of the total dried boards. Drying defects depend on the initial moisture content [ 5 , 23 , 24 , 25 , 26 ] and pith content [ 2 , 27 ] of the samples. From this study, it was noticed that 38.1% of the wood pieces consist of knots (dead and alive), and 25.82% consist of pith.…”

Section: Resultsmentioning

confidence: 99%

Investigating the drying characteristics of Anthocephalus chinensis (Lam.) A. Rich ex Walp wood

Ghosh¹,

Islam²,

Ghosh³

et al. 2022

Heliyon

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Section: Resultsmentioning

confidence: 99%

Investigating the drying characteristics of Anthocephalus chinensis (Lam.) A. Rich ex Walp wood

Ghosh¹,

Islam²,

Ghosh³

et al. 2022

Heliyon

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“…Parent woods from four different woods (D. panamensis, G. arborea, H. alchorneoides, and T. grandis) were tested and they came from residues. D. panamensis and H. alchorneoides residues came from lumber that was dried in drying kiln, and presented a moisture content (MC) of 12% [34,35]. Lumber of H. alchorneoides was from a commercial plantation of 12 years of age and lumber of D. panamensis from a commercial plantation of 16 years of age.…”

Section: Methodsmentioning

confidence: 99%

“…Lumber of H. alchorneoides was from a commercial plantation of 12 years of age and lumber of D. panamensis from a commercial plantation of 16 years of age. The information about plantation conditions of these two wood species are detailed in Moya and Tenorio [34]. G. arborea and T. grandis wood was collected from a plantation of 8 years of age [35].…”

Section: Methodsmentioning

confidence: 99%

Pyrogenic Carbonaceous Materials Production of Four Tropical Wood Produced by Slow Pyrolysis at Different Temperatures: Charcoal and Biochar Properties

Moya,

Tenorio,

Quesada-Kimzey

et al. 2024

Energies

Self Cite

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Costa Rica produces a considerable, important quantity of wood residues. This waste can be pyrolyzed to produce charcoals as main products that can be effectively used as an energy source or to immobilize carbon for soil treatment. However, there is a lack of information about the pyrogenic carbonaceous materials (PCMs), such as charcoal or biochar, obtained at different pyrolysis temperatures. Hence, this study aimed to evaluate the quality of PCMs (physical, mechanical, ultimate analysis, and FTIR analysis) and charcoal characteristics (energetic properties and thermogravimetric analysis—TGA) and biochar characteristics (conductivity, pH, initial contact angle, and wetting rates) for four tropical wood residues produced in five temperatures (300 °C, 350 °C, 400 °C, 450 °C, and 500 °C). In general, pyrolysis temperature between 450 °C and 500 °C produced charcoals with lower values of density, moisture content, compression strength, volatiles, H and O content, and higher values of C and ash contents, conductivity, pH, initial contact angle, and wetting rates. FTIR and TGA analyses show that celluloses and lignin are pyrolyzed at these temperatures, so these temperatures are recommended. The range of 300–350 °C is not recommended, as these parameters were inverse. Multivariate analysis shows that (i) PCMs obtained at lower temperatures (300–350 °C) from Dipteryx panamensis, Hieronyma alchorneoides, and Tectona grandis belong to a cluster with poorer properties, indicating that these temperatures are not adequate for pyrolysis of these species; (ii) all the PCMs obtained from Gmelina arborea were grouped into one cluster, suggesting different PCM quality; and (iii) the PCMs produced from D. panamensis, H. alchorneoides, and T. grandis at 400–500 °C were grouped into another cluster with better properties, suggesting this pyrolysis temperature range as the best for these species.

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“…The size and distribution patterns of residual stress are important in controlling drying defects (Yamamoto et al, 2021). Furthermore, pretreatment at high temperatures could reduce the stress arising from the anisotropy caused by shrinkage and moisture gradient, to prevent drying defects (Kang et al, 2020;Moya and Tenorio, 2022;Roger et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

Effects of Pretreatment for Controlling Internal Water Transport Direction on Moisture Content Profile and Drying Defects in Large-Cross-Section Red Pine Round Timber during Kiln Drying

BATJARGAL,

LEE,

CHO

et al. 2023

J. Korean Wood Sci. Technol.

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Round timber materials of 600 mm length, cut from large-cross-section round timber of red pine (Pinus densiflora S. et Z.) of 450 mm width and 4.2 m length, were prepared as the target of kiln drying in this study. After treating the target materials through end sealing (ES), end sealing -kerfing (ES-K), lateral sealing -end sealing -boring (LS-ES-B), or lateral sealing -partial end sealing (LS-PES), the effects of the treatment on the incidence of drying defects were determined. The target materials with exposed lateral surface and sealed cross surface were steamed at the initial temperature of 65℃ above the official pest control temperature of 56℃, followed by kiln drying toward the final temperature of 75℃. The target materials with sealed lateral surfaces, on the other hand, were dried at the initial temperature of 90℃ at almost the maximum temperature of conventional kiln drying, as there is no risk of early check formation caused by surface moisture evaporation. The final temperature was set at approximately 100℃. The drying time, taken for the target materials with initial moisture content of 70%-80% to reach the target moisture content of 19%, varied across treatment conditions. The measured drying time was 1,146 hours (approximately 48 days) for the timber with sealed cross surface and 745 hours (approximately 31 days) for the timber with sealed lateral surface, until the moisture content reached the target level. The formation of surface checks could not be prevented in the control and ES groups, but a definite preventive effect was obtained for the LS-ES-B and LS-PES groups.

show abstract

Application of the steaming step during kiln drying of lumber of two tropical species with high growth stress presence

Cited by 7 publications

References 28 publications

Investigating the drying characteristics of Anthocephalus chinensis (Lam.) A. Rich ex Walp wood

Investigating the drying characteristics of Anthocephalus chinensis (Lam.) A. Rich ex Walp wood

Pyrogenic Carbonaceous Materials Production of Four Tropical Wood Produced by Slow Pyrolysis at Different Temperatures: Charcoal and Biochar Properties

Effects of Pretreatment for Controlling Internal Water Transport Direction on Moisture Content Profile and Drying Defects in Large-Cross-Section Red Pine Round Timber during Kiln Drying

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