Thermo-Vacuum Modification of Poplar Veneers and its Quality Control

Sandak, Anna; Allegretti, Ottaviano; Cuccui, Ignazia; Sandak, Jakub; Rosso, Laura; Castro, Gaetano Lo; Negro, Francesco; Cremonini, Corrado; Zanuttini, Roberto

doi:10.15376/biores.11.4.10122-10139

Cited by 19 publications

(18 citation statements)

References 25 publications

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“…The decrease in mass loss reflects the intensity of the performed treatment and is in line with the values given by previous studies for the mass loss of thermally treated poplar wood [18].…”

Section: Discussionsupporting

confidence: 91%

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Physico-Mechanical Properties of Thermally Treated Poplar OSB

Cetera

Negro

Cremonini

et al. 2018

Forests

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Abstract:Oriented strand board (OSB) are widely marketed for several applications, from building to packaging. The manufacturing of poplar OSB has recently started in Northern Italy, representing a relevant innovation in the sector, given that this product is usually made of coniferous wood. Thermal treatment is nowadays widely used for increasing the dimensional stability and the durability of wood. The drawback is, however, that the mechanical performance of the treated wood product is reduced. The objective of this research was to analyze the effect of thermo-vacuum treatment on the characteristics of poplar OSB. To this purpose, boards 15 mm thick and with a density of 590 kg/m 3 were drawn from the standard production of the manufacturer and thermally treated under vacuum conditions at 190 • C for 2 h. Their mass loss, bending strength, modulus of elasticity, internal bond and swelling were determined. In addition, color change and wettability were studied before and after a weathering test. The thermal treatment significantly changed the properties of poplar OSB. The mass, the bending strength, the modulus of elasticity and the internal bond decreased with different intensities. The swelling after immersion in water decreased. The color switched toward a darker tone and the wettability decreased. After an accelerated weathering test (AWT), the color lightened, and the wettability increased. Overall, this study broadened the knowledge about the thermal treatment of this wood-based panel, which could enable new applications with particular attention to non-structural uses in humid conditions.

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Section: Discussionsupporting

confidence: 91%

“…Overall, thermally modified wood is suitable for non-structural uses in humid or exterior environments [16]. Thermal treatment is, therefore, often proposed as a means for valorizing wood of species with low natural durability [17] or for finding new applications to timber and related materials which have few market outlets [18,19].…”

Section: Introductionmentioning

confidence: 99%

Physico-Mechanical Properties of Thermally Treated Poplar OSB

Cetera

Negro

Cremonini

et al. 2018

Forests

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“…Dry thermal treatment technology under vacuum. Birch (Betulapendula Roth) wood with size 600 mm (grain) × 600 mm (tangential) × 1.4 mm (radial) and poplar (Populus x CanadensisMoench) wood rotary-cut veneers with size 600 mm (grain) × 600 mm (tangential) × 2 mm (radial) were treated according to the TERMOVUOTO® process [12] with four experimental regimes (temperature/duration): 204 ºC/2 h, 214 ºC/2 h, 217 ºC/3 h, and 218 ºC/30 min between aluminium plates in packs from 3 to 12 veneers in each under heat convective regime.…”

Section: Methodsmentioning

confidence: 99%

Thermal modification as tool to increase hydrophobicity of veneers

Meija-Feldmane

Sansonetti

Morozovs

et al. 2019

Engineering for Rural Development

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Plywood is a well-known material with versatile usage due to its strength to weight ratio. One of the drawbacks of this material is its susceptibility to wood colouring and degradation by the influence of fungi. Fungal growth is directly related to the wood service conditions, among which moisture is the most important. One of the ways of reducing the wood moisture content by the increase of the hydrophobicity of the material is a thermal modification (TM). Thermowood® is the most popular among many thermal treatment technologies. In this paper two less common TM methodologies-WTT and TERMOVUOTO® were used. The WTT technology is a closed process, where the thermal modification is conducted in water vapour environment with elevated pressure of about 7 bar, whereas the TERMOVUOTO® process is an open process with reduced pressure 0.25 bar. Three low-density wood species veneers were investigated-aspen (Populustremula L.), poplar (Populus x canadensisMoench) and birch (Betulapendula Roth). Aspen and birch veneers were treated according to WTT technology under previously determined optimal regime 160 ºC/50 min and it was used as a reference. Poplar and birch veneers were treated according to the TERMOVUOTO® technology with four experimental regimes 204 ºC/2 h, 214 ºC/2 h, 217 ºC/3 h, 218 ºC/30 min. The comparison of the contact angle values of untreated , thermo-vacuum treated and hydro-thermal treated birch and poplar wood veneer surface was used to evaluate the thermal treatment method effect. The treatment process smoothed the hydrophobic properties of the treated veneer surfaces regardless of the process severity and hardwood species peculiarities. The obtained results make it easier to deal with the gluing process of thermally modified veneers, allowing not to consider the impact of the treatment regime.

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“…Overall, modified wood is adequate for non-structural uses in humid or exterior environments, for instance in furnishing, flooring and facades [13]. Thermal treatment is therefore often proposed as a means for valorizing wood of species with low natural durability or for finding new applications to timber and related materials having few market outlets [14,15].…”

Section: Preprintsmentioning

confidence: 99%