Comparison between two different pretreatment technologies of rice straw fibers prior to fiberboard manufacturing: Twin-screw extrusion and digestion plus defibration

Theng, Dyna; Arbat, Gerard; Delgado-Aguilar, Marc; Ngo, Bunthan; Labonne, Laurent; Evon, Philippe; Mutjé, Pere

doi:10.1016/j.indcrop.2017.05.049

Cited by 28 publications

(26 citation statements)

References 43 publications

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“…Such temperature led to the best bending properties according to Mancera et al (2012). In parallel, looking at the TGA results for Biolignin TM and rice straw thermo-mechanical extrudates (Theng et al 2017a), the molding temperature was under the beginning of thermal degradation of organic compounds inside both binder and lignocellulosic fibers of extrudates. Applied pressure and molding duration were chosen for a target fiberboard's thickness of 3 mm, according to parameters already used in previous studies (Anglès et al 2001, Mancera et al 2012, Theng et al 2017b.…”

Section: Thermo-pressingmentioning

confidence: 98%

“…In parallel, maximum values (20% and 25%, respectively) were chosen in the same order of magnitude as for a previous study from Theng et al (2017b) using a corn stalk thermo-mechanical pulp as raw material and kraft lignin as green adhesive. For the L/S ratio at extrusion, minimum and maximum values originated from a previous work of Theng et al (2017a) using rice straw as starting material: with less than 0.33 L/S ratio, the fiber length would have been greatly reduced during the twin-screw defibration treatment, simultaneously with an important increase in the total production cost, whereas the use of L/S ratios more than 1.07 would have resulted in the filling of the twinscrew machine with water going back to the feeding module, thus preventing the proper introduction of rice straw.…”

Section: Thermo-pressingmentioning

confidence: 99%

“…fiberboard manufacturing) was cheaper than other defibring technologies, e.g. about nine times less expensive compared to a digestion plus defibration process using a rotary digester and then a Sprout-Waldron defibrator (Theng et al 2017a). Moreover, because no compound has been removed from the solid material during the thermo-mechanical treatment in the twin-screw extruder, there was no change on both chemical and thermal properties between the raw biomass (i.e.…”

Section: Introductionmentioning

confidence: 99%

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Production of fiberboard from rice straw thermomechanical extrudates by thermopressing: influence of fiber morphology, water and lignin content

et al. 2018

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The objective of this study was to investigate the influence of fiber morphology and molding parameters on mechanical and physical properties of fiberboards made from rice straw. The rice straw was thermo-mechanically treated using a twin-screw extruder. Water added at molding (0-20%), lignin content (0-25%), and liquid/solid ratio used for extrudate production (0.33-1.07) were the three parameters investigated. A Doehlert's experimental design was used to evaluate their influence on boards' properties. The results revealed that 0.4 liquid/solid ratio at extrudate production, 5% water added at molding, and 8.9% lignin content were the best tested conditions for bending properties. Density of fiberboard produced from these conditions was 1414 kg/m 3 (i.e. the densest board). Maximum flexural strength and elastic modulus were 50.3 MPa and 8.6 GPa, respectively. Thickness swelling and water absorption were 23.6% and 17.6%, respectively. Using the statistical analysis of the experimental design, a good compromise between density and flexural properties should be obtained from 0% water added, 25% lignin content, and 0.33 liquid/solid ratio at extrudate production. From the polynomial models, the corresponding boards' properties should be approximately 50 MPa maximum flexural strength, 6.0 GPa elastic modulus, 1102 kg/m 3 density, and 24% thickness swelling.

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Section: Thermo-pressingmentioning

confidence: 98%

Section: Thermo-pressingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Production of fiberboard from rice straw thermomechanical extrudates by thermopressing: influence of fiber morphology, water and lignin content

et al. 2018

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“…Until now, most of these residues have been burned or buried, which results in environmental pollution and wasted resources (Fan et al 2015;Theng et al 2017a). Recently, utilizing these residues in the fabrication of fiberboard has been considered a promising strategy, from both environmental and economic perspectives (Jin et al 2017;Zhang et al 2017).…”

Section: Introductionmentioning

confidence: 99%

“…Sam-Brew and Smith (2017) prepared boards from flax shive and hemp hurd residues. Theng et al (2017a) assessed boards fabricated from the rice straw that was modified by a digestion plus defibration process. Uitterhaegen et al (2017) manufactured boards from the coriander straw that was treated with a twin-screw extrusion method.…”

Section: Introductionmentioning

confidence: 99%

Comparison of the Properties of Fiberboard Composites with Bamboo Green, Wood, or their Combination as the Fibrous Raw Material

2018

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The potential of bamboo green (B), an abundant lignocellulosic residue from the bamboo processing industry, was evaluated to serve as an alternative fibrous raw material in the production of fiberboard. Ureaformaldehyde resin-bonded fiberboards were prepared from B, wood fiber (W), and a mixture of the two (BW). The board type depended on the mass fraction of B in fibrous raw materials (including B and W), which were 0%, 20%, 40%, 60%, 80%, and 100%. The analytical methods used to characterize fibers and fiberboards included X-ray diffraction, thermogravimetric analysis, dynamic mechanical analysis, contact angle analysis, physical-mechanical analysis, and scanning electron microscopy. Compared with W, B showed a higher crystallinity index and thermogravimetric stability, but lower surface hydrophilicity and weaker interactions with urea-formaldehyde resin. Compared with W fiberboards, B fiberboards possessed a lower interfacial adhesion but fibrous raw materials in B fiberboards were better dispersed; moreover, B fiberboard displayed a higher dynamic viscosity, thermogravimetric stability, surface wettability, water absorption, and flexural modulus, but lower thickness swelling and flexural strength. The fiberboards produced with BW had better performances than the fiberboards produced with B and W. The 40% B mass fraction resulted in BW fiberboards with the best physicalmechanical properties.

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Thermo‐Compressed Films of Poly(butylene succinate) Reinforced with Cellulose Fibers Obtained from Rice Straw by Green Extraction Methods

Olivas‐Alonso,

Freitas,

Torres‐Giner

et al. 2024

Macro Materials & Eng

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In this study, two green extraction methods are explored to valorize rice straw into cellulose fibers (CFs), namely subcritical water extraction (SWE) and combined ultrasound‐heating treatment (USHT). The resultant fibers are, thereafter, successfully pretreated with (3‐glycidyloxypropyl) trimethoxysilane (GPS) and incorporated at 3% wt into poly(butylene succinate) (PBS) by melt‐mixing. The green composites are shaped into films by thermo‐compression and characterized in terms of their performance for food packaging applications. The chemical analysis of the fibers reveals that SWE is more effective to selectively remove hemicelluloses than USHT, whereas silanization promotes the removal of lignin in both fiber types. Fiber incorporation, more notably in the case of the silanized fibers, restricts the movement of the PBS chains, indicating good interaction with the biopolyester matrix. In particular, CFs act as antinucleating agents in PBS, delaying both glass transition and crystallization from the melt phenomena and hindering crystal formation. Furthermore, the fibers mechanically reinforce and improve the oxygen barrier of the PBS films. The highest barrier enhancement is obtained for the thermo‐compressed composite film with silanized fibers obtained by SWE, yielding a decrease of nearly 20% in the permeability to oxygen versus the unfilled PBS film.

show abstract

Comparison between two different pretreatment technologies of rice straw fibers prior to fiberboard manufacturing: Twin-screw extrusion and digestion plus defibration

Cited by 28 publications

References 43 publications

Production of fiberboard from rice straw thermomechanical extrudates by thermopressing: influence of fiber morphology, water and lignin content

Production of fiberboard from rice straw thermomechanical extrudates by thermopressing: influence of fiber morphology, water and lignin content

Comparison of the Properties of Fiberboard Composites with Bamboo Green, Wood, or their Combination as the Fibrous Raw Material

Thermo‐Compressed Films of Poly(butylene succinate) Reinforced with Cellulose Fibers Obtained from Rice Straw by Green Extraction Methods

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