Thermal modification of consolidated oriented strandboards: effects on dimensional stability, mechanical
   properties, chemical composition and surface color

Menezzi, Cláudio Henrique Soares Del; Tomaselli, Ivan; Okino, Esmeralda Yoshico Arakaki; Teixeira, Divino Eterno; Santana, Marcos Antônio Eduardo

doi:10.1007/s00107-009-0332-2

Cited by 43 publications

(33 citation statements)

References 30 publications

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“…Many attempts to integrate TM technology with panel production can be found in the literature. Thermal treatment was first applied directly after the manufacturing of oriented strand boards (OSB) (Del Menezzi et al 2009), and Zdravković et al (2013) and Fioravanti et al (2013) proposed the TM of veneers before plywood production. Ruponen et al (2014) presented research regarding the auto-adhesion of veneers in plywood by using heat, moisture, and mechanical compression.…”

Section: Introductionmentioning

confidence: 99%

Thermo-Vacuum Modification of Poplar Veneers and its Quality Control

Sandak¹,

Allegretti²,

Cuccui³

et al. 2016

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Poplar wood is commonly used for many purposes due to its easy machinability, low density, uniform light colour, and relatively low cost. Here, vacuum thermal treatment is proposed for upgrading veneers in the manufacturing of plywood panels with resulting reduced hygroscopicity, improved durability, and dimensional stability. Thirty-eight batch processes with different treatment conditions (temperature ranging from 150 to 240 °C, time from 0.5 to 22.5 h and pressure from 100 to 1000 mbar) were performed to characterize the influence of process parameters on the product properties. Samples were characterized considering their appearance (colour) and their physical (mass loss and equilibrium moisture content), mechanical (bending strength), and chemical (investigated with near infrared spectroscopy (NIR)) properties. The darkening of poplar veneers and the reduction of mechanical strength were observed with increased treatment time and intensity. Mass loss closely correlated with colour change, resulting from chemical changes in wood components. Principal component analysis (PCA) and partial least squares (PLS) were used for evaluation of near infrared spectral data. Both were correlated with several technical properties, and thus NIR allowed the simultaneous prediction of several of these properties. Both colour change and NIR could be used to optimize the thermal treatment of poplar veneers at the industrial scale and for realtime statistical process control.

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Section: Introductionmentioning

confidence: 99%

Thermo-Vacuum Modification of Poplar Veneers and its Quality Control

Sandak¹,

Allegretti²,

Cuccui³

et al. 2016

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“…One of the possible alternatives for improving the dimensional stability of the panels is heat treatment, which aims to degrade the hemicellulose, the more hygroscopic component of the cell wall, as well as free up the compressive stress formed during pressing 12,13,14 . The degradation of wood hemicelluloses, which starts below 200 °C, begins with deacetylation, and the released acetic acid acts as a depolymerization catalyst that further increases polysaccharide decomposition 15 .…”

Section: Introductionmentioning

confidence: 99%

Effect of Post-production Heat Treatment on Particleboard from Sugarcane Bagasse

et al. 2015

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This study aimed to evaluate the effect of heat treatment on the physical and mechanical properties of particleboard from sugarcane bagasse. The experiment consisted of seven treatments arranged in a 2 × 3 factorial arrangement (two heat treatment times -8 and 12 min, and three heat treatment temperatures -200 °C, 230 °C, and 260 °C) and treatment control (without heat treatment). We evaluated the properties such as apparent density, water absorption after 2 and 24 h (WA2h andWA24h), thickness swell after 2 and 24 h (TS2h and TS24h), irreversible thickness swelling rate (ITS), internal bond, Modulus of Elasticity (MOE), and Modulus of Rupture (MOR) in static bending. In general, the use of heat treatment appeared very promising for improving the dimensional stability of sugarcane bagasse particleboard, without being made unviable by the mechanical properties reduction.

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“…Therefore, the WL might have been exclusively due to the loss of water and volatile extractives, instead of polymer degradation, or even this last happened at low intensity. This result was surprising, since at 170ºC at least the thermal degradation of hemicelluloses would be expected, which would lead to more mass loss, as found by Del Menezzi et al (2009). It also can be concluded that the initial reduction in the density of the treated materials was due to the decrease of moisture content (MC).…”

Section: Discussionmentioning

confidence: 92%

“…Tests conducted previously showed that the internal temperature of boards achieved near 170ºC (assumed as glass transition temperature of dry wood, T g ) after about 30 minutes. According to our previous work (Del Menezzi et al 2009) the duration of treatment between 12 and 20 minutes would be enough to promote polymer degradation. This way, in treatments 1 and 3, the pressures were applied for 15 minutes after the board reached the inner temperature of 170°C (ca.…”

Section: Thermo-mechanical Treatmentsmentioning

confidence: 99%

Properties of Thermo-Mechanically Treated Wood From Pinus Caribaea Var. Hondurensis

Santos¹,

Menezzi²,

Souza³

2012

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This study aimed at evaluating the effect of thermo-mechanical treatment on properties of Pinus caribaea var. hondurensis wood. Two pressure levels (25% and 50% of the compression strength perpendicular to grain) were evaluated. The treatment was applied in a laboratory hot press in one-step or two-step modes for 50 minutes. In the one-step treatment, the total pressure was applied after the temperature of the center of the wood reached 170°C. In the two-steps treatment, half of the pressure was applied after the center of the wood reached 100°C, and the final pressure was applied when it reached 170°C. The weight loss immediately after treatment was equivalent to the wood moisture content, indicating that degradation of wood polymers did not occur. However, the treatments showed decreasing values of the moisture content, which were reduced from 12.3% to 9.8%. A moderate improvement on surface roughness was achieved, while wood wettability was highly reduced in all treatments, as determined by contact angle measurement. On the other hand, the treatment applied did not improve the wood dimensional stability, but all mechanical properties presented a trend of improvement.

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Thermal modification of consolidated oriented strandboards: effects on dimensional stability, mechanical properties, chemical composition and surface color

Cited by 43 publications

References 30 publications

Thermo-Vacuum Modification of Poplar Veneers and its Quality Control

Thermo-Vacuum Modification of Poplar Veneers and its Quality Control

Effect of Post-production Heat Treatment on Particleboard from Sugarcane Bagasse

Properties of Thermo-Mechanically Treated Wood From Pinus Caribaea Var. Hondurensis

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