Advances in Wood Composites III

Papadopoulos, Antonios N.

doi:10.3390/polym13010163

Cited by 18 publications

(12 citation statements)

References 18 publications

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“…Their tendency to absorb a large amount of moisture [ 83 ] is problematic, as is their low fire and anti-fungal/bacteria resistance [ 84 , 85 , 86 ]. These problems can be solved by chemical treatment of the surface, which lowers the environmental advantage of these materials [ 87 , 88 , 89 , 90 ].…”

Section: Resultsmentioning

confidence: 99%

Thermophysical Properties of Larch Bark Composite Panels

et al. 2021

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The effects of using 100% larch bark (Larix decidua Mill) as a raw material for composite boards on the thermophysical properties of this innovative material were investigated in this study. Panels made of larch bark with 4–11 mm and 10–30 mm particle size, with ground bark oriented parallel and perpendicular to the panel’s plane at densities varying from 350 to 700 kg/m3 and bonded with urea-formaldehyde adhesive were analyzed for thermal conductivity, thermal resistivity and specific heat capacity. It was determined that there was a highly significant influence of bulk density on the thermal conductivity of all the panels. With an increase in the particle size, both parallel and perpendicular to the panel´s plane direction, the thermal conductivity also increased. The decrease of thermal diffusivity was a consequence of the increasing particle size, mostly in the parallel orientation of the bark particles due to the different pore structures. The specific heat capacity is not statistically significantly dependent on the density, particle size, glue amount and particle orientation.

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Section: Resultsmentioning

confidence: 99%

Thermophysical Properties of Larch Bark Composite Panels

et al. 2021

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“…Harmful formaldehyde emissions can be reduced by adding various inorganic, organic, and mineral compounds as formaldehyde scavengers to conventional wood adhesives, such as phosphates, salts, urea, nanoparticles, bark, tannins, etc. [ 34 , 35 , 36 , 37 , 38 , 39 , 40 , 41 , 42 , 43 ], by surface treatment of finished wood-based panels [ 34 ] or by using eco-friendly, formaldehyde-free adhesive formulations [ 44 , 45 , 46 , 47 , 48 , 49 , 50 , 51 , 52 , 53 , 54 ].…”

Section: Introductionmentioning

confidence: 99%

Properties of High-Density Fiberboard Bonded with Urea–Formaldehyde Resin and Ammonium Lignosulfonate as a Bio-Based Additive

et al. 2021

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The potential of ammonium lignosulfonate (ALS) as an eco-friendly additive to urea–formaldehyde (UF) resin for manufacturing high-density fiberboard (HDF) panels with acceptable properties and low free formaldehyde emission was investigated in this work. The HDF panels were manufactured in the laboratory with very low UF resin content (4%) and ALS addition levels varying from 4% to 8% based on the mass of the dry wood fibers. The press factor applied was 15 s·mm−1. The physical properties (water absorption and thickness swelling), mechanical properties (bending strength, modulus of elasticity, and internal bond strength), and free formaldehyde emission were evaluated in accordance with the European standards. In general, the developed HDF panels exhibited acceptable physical and mechanical properties, fulfilling the standard requirements for HDF panels for use in load-bearing applications. Markedly, the laboratory-produced panels had low free formaldehyde emission ranging from 2.0 to 1.4 mg/100 g, thus fulfilling the requirements of the E0 and super E0 emission grades and confirming the positive effect of ALS as a formaldehyde scavenger. The thermal analyses performed, i.e., differential scanning calorimetry (DSC), thermal gravimetric analysis (TGA), and derivative thermogravimetry (DTG), also confirmed the main findings of the research. It was concluded that ALS as a bio-based, formaldehyde-free adhesive can be efficiently utilized as an eco-friendly additive to UF adhesive formulations for manufacturing wood-based panels under industrial conditions.

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“…This reflects in increased productivity of the plants and enlarged production quantities, which in 2019 reached 357.6547 million m 3 [10]. However, the issues associated with the environmental and human-health related impact of woodbased panels, mainly connected with the hazardous emission of free formaldehyde and other volatile organic compounds (VOCs) from the finished wood-based panels, still remain relevant [11][12][13][14][15][16]. At present, the woodbased plants aim to produce panels with formaldehyde emission class E1 ( ≤ 8 mg/100 g).…”

Section: Introductionmentioning

confidence: 99%

Optimization of the Hot-Pressing Regime in the Production of Eco-Friendly Fibreboards Bonded with Hydrolysis Lignin

Valchev

Yordanov

Savov

et al. 2021

Period. Polytech. Chem. Eng.

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This research was aimed at studying the potential of using residual lignin from acid hydrolysis as a binder in manufacturing eco-friendly, dry-process fibreboards. For that purpose, a modification of the adhesive system and hot-pressing regime was conducted. The adhesive system applied was composed of 2 % phenol-formaldehyde (PF) resin and 10 % hydrolysis lignin (based on the dry fibres). The PF resin does not only act as a binder but generally contributes to the even distribution and good retention of the main binder – hydrolysis lignin. A specific hot-pressing cycle was used. In the first stage, the pressure was 1.0 MPa, followed by an increased pressure of 4.0 MPa, and subsequent cooling. The purpose of the initial lower pressure was softening the lignin and reduction of the material moisture content. The effect of the second stage of hot-pressing on the properties of eco-friendly fibreboards was investigated. It was determined that the fibreboards produced with 2 % PF resin and 10 % hydrolysis lignin have similar physical and mechanical properties to those of the control panels, produced with 10 % PF resin at a standard hot-pressing cycle. The findings of this work demonstrate that residual hydrolysis lignin can be effectively utilized as a binder in the production of eco-friendly, dry-process fibreboards with acceptable physical and mechanical properties.

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Advances in Wood Composites III

Abstract: Wood composites are man-made materials that can be easily manufactured from a variety of raw lignocellulosic materials and the appropriate binder [...]

Cited by 18 publications

References 18 publications

Thermophysical Properties of Larch Bark Composite Panels

Thermophysical Properties of Larch Bark Composite Panels

Properties of High-Density Fiberboard Bonded with Urea–Formaldehyde Resin and Ammonium Lignosulfonate as a Bio-Based Additive

Optimization of the Hot-Pressing Regime in the Production of Eco-Friendly Fibreboards Bonded with Hydrolysis Lignin

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