Kinetic analysis of poplar wood properties by thermal modification in conventional oven

Marcon, Bertrand; Goli, Giacomo; Matsuo-Ueda, Miyuki; Denaud, Louis; Umemura, Kenji; Gril, Joseph; Kawai, Shinya

doi:10.3832/ifor2422-010

Cited by 16 publications

(28 citation statements)

References 41 publications

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“…The inflection point of the decrease in elastic modulus occurs under the condition of saturated steam at 180 °C, and the decreasing trend is obviously increased. At 140 °C, the MOE of bamboo increased by 17.3% comparing to untreated bamboo, which may resulted from the reduction of moisture content [35]. At 160 °C, the change in MOE of bamboo is not obvious compared with untreated material.…”

Section: Mechanical Propertiesmentioning

confidence: 90%

Effect of high-temperature saturated steam treatment on the physical, chemical, and mechanical properties of moso bamboo

et al. 2020

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Moso bamboo (Phyllostachys heterocycla (Carr.) Mitford cv. Pubescens) was subjected to heat treatment with saturated steam at 140, 160, and 180 °C for 10-30 min to evaluate the effects of the treatment on the properties of bamboo. The changes in the physical, mechanical, and chemical properties as well as microscopic structures of moso bamboo were analyzed in this study. Results indicated that its equilibrium moisture content (EMC) decreased gradually after being treated by high-temperature saturated steam mostly due to the hemicelluloses' degradation. Both the temperature and duration of treatment affect the mechanical properties of bamboo. The modulus of elasticity (MOE) of bamboo was prone to be affected by heat treatment with saturated steam as compared to the modulus of rupture (MOR). The MOR and MOE increased as compared to the control when the sample was treated at 140 °C. However, a severe treatment negatively affects the mechanical properties of bamboo. The MOR and MOE decreased by 47% and 20% as compared to the control when the sample was heated at 180 °C for 30 min.

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Section: Mechanical Propertiesmentioning

confidence: 90%

Effect of high-temperature saturated steam treatment on the physical, chemical, and mechanical properties of moso bamboo

et al. 2020

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“…The huge number of modification variables together with the large number of wood species available makes the research studies in the field too difficult to compare to one another. A kinetics approach is considered by various authors as one of the best ways to describe T and HT modification processes, either for conventional oven (Goli et al 2014b;Matsuo et al 2012Matsuo et al , 2016Marcon et al 2018) and for saturated steam environment (Endo et al 2016;Esteves et al 2007;Navi and Girardet 2000;Obataya et al 2018). The main physical descriptor of the state of degradation of the sample is recognised to be the dry mass loss as discussed by Candelier et al (2015Candelier et al ( , 2016.…”

Section: Introductionmentioning

confidence: 99%

“…The main physical descriptor of the state of degradation of the sample is recognised to be the dry mass loss as discussed by Candelier et al (2015Candelier et al ( , 2016. The kinetics are typically modelled using the time-temperature superposition method and in this paper the method proposed by Goli and Marcon was adopted (Goli et al 2014b;Marcon et al 2018). Marcon et al (2018) modelling approach takes into account a temperature effect on the pre-exponential factor to enhance the predictive ability of the model.…”

Section: Introductionmentioning

confidence: 99%

Thermal modification kinetics and chemistry of poplar wood in dry and saturated steam media

et al. 2021

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This research work presents a modelling strategy to analyse thermal conversion rates of two thermal wood modification processes based on time-temperature superposition method. It gathers in a single study different original and bibliographic experimental works analysing the dry mass variation that occurs during thermal and hydro-thermal wood modification processes. The mass loss kinetic was successfully modelled using a modified Arrhenius approach. The time-temperature superposition method allowed to define for each wood modification process a master curve and its time shift depending on the treatment temperature. The analysis of ventilated oven and saturated steam treatments pointed out the existence of a continuous single kinetic for the ventilated oven which became more complex for saturated steam since a second kinetic stage appeared. This kinetic difference was sustained by infrared spectra chemical analysis which showed that hemicelluloses degraded much faster in presence of steam while lignin degradation occurred in both conditions.

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“…Four industries are active in Italy in the field of thermal modification technologies and several plants have been established at the national level (Goli et al 2019). In recent years various studies have investigated the effects of thermal treatment on the properties of poplar wood and derived products, taking into account solid wood (Marcon et al 2018), veneers (Castro et al 2016, Sandak et al 2016, oriented strand board (Cetera et al 2018) and plywood (Goli et al 2014. In particular, Zanuttini et al (2020) investigated the effect of thermal treatment on poplar plywood by characterizing its density, bending strength, modulus of elasticity, bonding quality, color change and decay durability.…”

Section: Introductionmentioning

confidence: 99%

Hardness and contact angle of thermo-treated poplar plywood for bio-building

Zanuttini¹,

Negro²,

Cremonini³

2021

iForest

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The interest towards poplar cultivation and its wood has recently been growing in Italy, where the use of timber and wood-based materials in construction is increasing as well. Poplar plywood, with a national production of around 270,000 m 3 in 2017, is a key product for the Italian wood sector, and currently is destined for several applications as component for furniture and motorhomes. Previous research has shown that thermal treatment can be effectively applied to poplar plywood in order to make it suitable to the requirements of new end-uses. The present study aims to widen the knowledge of the effects of thermal treatment on poplar plywood. With this purpose, 7-layered, 12-mm thick plywood bonded with urea-melamine-formaldehyde (UMF) resin was thermally treated for 2 h at 170, 190 and 210 °C through the Termovuoto ® process. The treatment aimed to improve the dimensional stability and durability against fungal decay. The process was set at lower temperature and shorter time than those of many thermal treatments commonly used in practice in order to limit the reduction in mechanical properties and to maintain an adequate bonding quality. The above properties were already verified by previous research, whereas in this study Brinell hardness and contact angle of treated panels were investigated as relevant for several end-uses that can be prospected in building and in outdoor environments. Brinell hardness decreased from 10.8 to 8.3 N mm -2 and contact angle increased from 75.8° to 103.6°. Overall, treatment at 190 °C seems the most suitable to induce balanced modifications in the panels. From a technical point of view, these appear ready to enter the market, for instance for use in exterior claddings, partitions and outdoor flooring.

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Kinetic analysis of poplar wood properties by thermal modification in conventional oven

Cited by 16 publications

References 41 publications

Effect of high-temperature saturated steam treatment on the physical, chemical, and mechanical properties of moso bamboo

Effect of high-temperature saturated steam treatment on the physical, chemical, and mechanical properties of moso bamboo

Thermal modification kinetics and chemistry of poplar wood in dry and saturated steam media

Hardness and contact angle of thermo-treated poplar plywood for bio-building

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