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Open AccessArticle

Structural Application of Eco-Friendly Composites from Recycled Wood Fibres Bonded with Magnesium Lignosulfonate

1
Department of Mechanical Wood Technology, Faculty of Forest Industry, University of Forestry, 1797 Sofia, Bulgaria
2
Department of Interior and Furniture Design, Faculty of Forest Industry, University of Forestry, 1797 Sofia, Bulgaria
3
Department of Pulp, Paper and Printing Arts, University of Chemical Technology and Metallurgy, 1797 Sofia, Bulgaria
*
Author to whom correspondence should be addressed.
Appl. Sci. 2020, 10(21), 7526; https://doi.org/10.3390/app10217526
Received: 14 October 2020 / Revised: 23 October 2020 / Accepted: 24 October 2020 / Published: 26 October 2020
(This article belongs to the Special Issue Application of Wood Composites)
The pulp and paper industry generates substantial amounts of solid waste and wastewater, which contain waste fibres. The potential of using these recycled wood fibres for producing eco-friendly composites that were bonded with a formaldehyde-free adhesive (magnesium lignosulfonate) and their use in structural applications was evaluated in this study. Fibreboards were produced in the laboratory with a density of 720 kg·m−3 and 15% magnesium lignosulfonate gluing content, based on the dry fibres. The mechanical properties (bending strength, modulus of elasticity and internal bond strength), physical properties (thickness swelling and water absorption) and formaldehyde content were determined and compared with the European Standards requirements for wood-based panels. In general, the laboratory-produced panels demonstrated acceptable mechanical properties, such as bending strength (18.5 N·mm−2) and modulus of elasticity (2225 N·mm−2), which were higher than the minimum requirements for type P2 particleboards and equal to the requirements for MDF panels. The moisture properties, i.e., thickness swelling (24 h) and water absorption (24 h) significantly deteriorated. The free formaldehyde content of the laboratory-produced composites (1.1 mg/100 g) reached the super E0 grade (≤1.5 mg/100 g), which allowed for their classification as eco-friendly, low-emission wood-based composites. The L-type corner joints, made from the developed composites, demonstrated significantly lower bending capacity (from 2.5 to 6.5 times) compared to the same joints made from MDF panels. Nevertheless, the new eco-friendly composites can be efficiently utilised as a structural material in non-load-bearing applications. View Full-Text
Keywords: wood composites; recycled fibres; bioadhesives; magnesium lignosulfonate; corner joints; bending strength capacity wood composites; recycled fibres; bioadhesives; magnesium lignosulfonate; corner joints; bending strength capacity
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MDPI and ACS Style

Antov, P.; Jivkov, V.; Savov, V.; Simeonova, R.; Yavorov, N. Structural Application of Eco-Friendly Composites from Recycled Wood Fibres Bonded with Magnesium Lignosulfonate. Appl. Sci. 2020, 10, 7526. https://doi.org/10.3390/app10217526

AMA Style

Antov P, Jivkov V, Savov V, Simeonova R, Yavorov N. Structural Application of Eco-Friendly Composites from Recycled Wood Fibres Bonded with Magnesium Lignosulfonate. Applied Sciences. 2020; 10(21):7526. https://doi.org/10.3390/app10217526

Chicago/Turabian Style

Antov, Petar; Jivkov, Vassil; Savov, Viktor; Simeonova, Ralitsa; Yavorov, Nikolay. 2020. "Structural Application of Eco-Friendly Composites from Recycled Wood Fibres Bonded with Magnesium Lignosulfonate" Appl. Sci. 10, no. 21: 7526. https://doi.org/10.3390/app10217526

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