Strength properties and dimensional stability of particleboards with different proportions of thermally treated recycled pine particles

Andrade, Paulo Ivan Lima de; Araújo, Solange de Oliveira; Neiva, Duarte; Vital, Benedito Rocha; Carneiro, Angélica de Cássia Oliveira; Gominho, Jorge; Pereira, Helena

doi:10.1515/hf-2015-0090

Cited by 12 publications

(4 citation statements)

References 40 publications

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“…Similar results were also described for biomass torrefaction by Esteves et al For E. globulus wood treated over 24 h at 190 °C, the extractives content increased from 9% to 19% and lignin from 25% to 34%. The variation of monosaccharides content in thermally treated wood (220 °C) was described by Andrade et al where glucose rose from 41% to 44% and xylose decreased from 4.8% to 2.5%.…”

Section: Resultsmentioning

confidence: 92%

Effect of Rice Husk Torrefaction on Syngas Production and Quality

et al. 2017

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The aim of this study was the production of a good quality gasification gas (syngas) with rice husk residues. This material was torrefied before gasification with the aim of improving this last process, and the effect of torrefaction time and temperature was investigated. The variation of temperature from 200 to 300 °C decreased moisture and volatile matter and, consequently, increased higher heating value (HHV). The increase of reaction time from 30 to 60 min at 250 or 300 °C had a milder effect than the rise of torrefaction temperature. The optimum conditions for the rice husk torrefaction prior to gasification were 250 °C and 30 min, as the torrefied material presented an HHV of 22.1 MJ/kg daf and an ash content of 17.7%. The torrefaction increased the rice husk in extractives 14.8% (vs 12.6% in the raw material), mainly in nonpolar extractives and lignin (36.4% vs 28.9%). Py-GC/MS analyses determined that raw rice husk presented a monomeric composition of lignin (H/G/S) of 4:12:1 and ratio of carbohydratesto lignin of 3.3 while the torrefied material showed, respectively, 3:9:2 and 3.9. Compared with the raw rice husks, the gasification of torrefied rice husk at 250 °C presented a syngas poorer in CO2 (39% vs 24%) and richer in H2 (31% vs 36%) and CO (17% vs 24%) and produced less tar (7.6 g/m3 vs 3.5 g/m3) but released more pollutants (186 vs 92 ppmv of H2S and 1284 vs 734 ppmv of NH3).

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Section: Resultsmentioning

confidence: 92%

Effect of Rice Husk Torrefaction on Syngas Production and Quality

et al. 2017

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“…An idea and main motive of this study is that such thermally modified wood (TMW) components could be interesting for use in wood plastic composites (WPC); ie a value adding concept of wood residuals, and with a potential to significantly enhance also the in-service properties of WPC such as increased moisture resistance, dimensional stability, and resistance against attack by microorganisms. Studies of thermal modification of wood components for the use in particleboards have been conducted by Paul et al (2006) and Medved et al (2012); analyzing the effects on dimensional stability, and also strength properties (Andrade et al 2016). They reported lowered hygroscopicity and increased dimensional stability as a result of the thermal modification.…”

Section: Introductionmentioning

confidence: 99%

Sorption and Surface Energy Properties of Thermally Modified Spruce Wood Components

Källbom

Altgen

Militz

et al. 2018

W&FS

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The objective of this work is to study the water vapor sorption and surface energy properties of thermally modified wood (TMW) components, ie wood processing residuals in the form of sawdust. The thermal modification was performed on spruce wood components using a steam-pressurized laboratoryscale reactor at two different temperature (T ) and relative humidity (RH) conditions, T ¼ 150°C and RH ¼ 100% (TMW150), and T ¼ 180°C and RH ¼ 46% (TMW180). A dynamic vapor sorption (DVS) technique was used to determine water vapor sorption isotherms of the samples for three adsorption-desorption cycles at varying RH between 0% and 95%. Inverse gas chromatography (IGC) was used to study the surface energy properties of the samples, including dispersive and polar characteristics. The DVS results showed that the EMC was reduced by 30-50% for the TMW samples compared with control samples of unmodified wood (UW) components. A lower reduction was, however, observed for the second and third adsorption cycles compared with that of the first cycle. Ratios between EMC of TMW and that of UW samples were lower for the TMW180 compared with the TMW150 samples, and an overall decrease in such EMC ratios was observed at higher RH for both TMW samples. The IGC results showed that the dispersive contribution * Corresponding author † SWST member to the surface energy was higher at lower surface coverages, ie representing the higher energy sites, for the TMW compared with the UW samples. In addition, an analysis of the acid-base properties indicated a higher K B than K A number, ie a higher basic than acidic contribution to the surface energy, for all the samples. A higher K B number was also observed for the TMW compared with the UW samples, suggested to relate to the presence of ether bonds from increased lignin and/or extractives content at the surface. The K B was lower for TMW180 compared with TMW150, as a result of higher modification temperature of the first, leading to cleavage of these ether bonds.

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“…Kurowska et al [13] conducted laboratory tests on the possibility of using particles from waste plywood contaminated with UF resin to produce OSB. Andrade et al [14] examined the strength properties and dimensional stability of particleboards with different proportions of thermally treated recycled pine particles. Lee et al [15] stated that wood particles are the second-most costly element after resin in particleboard production, where both elements account for more than 50% of the overall production cost.…”

Section: Introductionmentioning

confidence: 99%

Characteristics of the Pressing Process and Density Profile of MUPF-Bonded Particleboards Produced from Waste Plywood

Laskowska

2024

Materials

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Waste plywood containing phenol–formaldehyde (PF) resin is one of the materials that are difficult to use in the production of particleboards based on UF resin. Therefore, the aim of this research was to analyze the possibility of using this type of waste in the production of particleboards bonded with melamine-urea-phenol-formaldehyde (MUPF) resin in order to determine their suitability for particleboard production. The pressing process and density profile of three-layer particleboards were presented. The press closing time for mats containing only recovered particles in the core layer (100%), produced with a face layer ratio of 50%, a resin load for a face layer of 12%, and a core layer of 10%, at a unit pressure of 3 MPa, was 29% shorter than for the industrial particle mats. Regardless of the level of variability of independent factors, the heating time of the mats containing recovered particles was 10–20% shorter than the heating time of the mats with industrial particles. The greatest impact on the maximum density of the face layer of particleboards was observed for the content of the recovered particles and then the resin load. The maximum density area of the face layer was located closer to the surface in particleboards produced with a higher (80%, 100%) content of the recovered particles, a higher (i.e., 12% and 10%, respectively, for face and core layers) resin load, a lower (35%) face layer ratio, and a higher (3 MPa) unit pressure.

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Strength properties and dimensional stability of particleboards with different proportions of thermally treated recycled pine particles

Cited by 12 publications

References 40 publications

Effect of Rice Husk Torrefaction on Syngas Production and Quality

Effect of Rice Husk Torrefaction on Syngas Production and Quality

Sorption and Surface Energy Properties of Thermally Modified Spruce Wood Components

Characteristics of the Pressing Process and Density Profile of MUPF-Bonded Particleboards Produced from Waste Plywood

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