The utilization of tree bark

Pásztory, Zoltán; Mohácsiné, Ildikó Ronyecz; Gorbacheva, Galina; Börcsök, Zoltán

doi:10.15376/biores.11.3.pasztory

Cited by 102 publications

(56 citation statements)

References 119 publications

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“…Research has been conducted regarding the production of high-value products extracted from this biomass fraction, where it can be seen that Acacia spp. are one of a few 24 species that currently have commercialized products retrieved from their bark, especially for the leather and adhesive industries [23,24]. Recent research has shown that the bark of Acacia spp.…”

Section: Barkmentioning

confidence: 99%

Insights for the Valorization of Biomass from Portuguese Invasive Acacia spp. in a Biorefinery Perspective

Correia

Quintela²,

Duarte

et al. 2020

Forests

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Acacia spp. are widespread all over the Portuguese territory, representing a threat to local biodiversity and to the productivity of the forest sector. The measures adopted in some countries for their eradication or to control their propagation are expensive, have been considered unfeasible from practical and economical perspectives, and have generated large amounts of residue that must be valorized in a sustainable way. This review brings together information on the valorization of bark, wood, leaves, flowers, pods, seeds, roots, and exudates from Acacia spp., through the production of high-value bioactive extracts (e.g., antioxidant, antimicrobial, anti-inflammatory, antidiabetic, antiviral, anthelmintic, or pesticidal agents, suitable to be explored by pharmaceutical, nutraceutical, cosmetics, and food and feed industries), its incorporation in innovative materials (e.g., polymers and composites, nanomaterials, low-cost adsorbents), as well as through the application of advanced thermochemical processes (e.g., flash pyrolysis) and pre-treatments to decompose biomass in its structural components, regarding the production of biofuels along with valuable chemicals derived from cellulose, hemicellulose, and lignin. The knowledge of this research is important to encourage an efficient and sustainable valorization of Acacia spp. within a biorefinery concept, which can bring a significant economic return from the valorization of these residues, simultaneously contributing to forest cleaning and management, to reduce the risk of fires, and to improve the social-economic development of rural areas.

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Section: Barkmentioning

confidence: 99%

Insights for the Valorization of Biomass from Portuguese Invasive Acacia spp. in a Biorefinery Perspective

Correia

Quintela²,

Duarte

et al. 2020

Forests

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“…Bark is the outer layer of trees, divided into two anatomically different layers, the outer bark, whose primary purpose is the protection of the underlaid tissues, and the inner bark that transports the assimilation products from leaves to the root with active tissues close to cambium [ 1 ]. Various types of extractives (especially carbohydrates) are included in the tree bark [ 2 , 3 ].…”

Section: Introductionmentioning

confidence: 99%

Binderless Thermal Insulation Panels Made of Spruce Bark Fibres

et al. 2021

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Tree bark is a by-product of the timber industry available in large amounts, considering that approximately 10% of the volume of a tree stem is bark. Bark is used primarily for low-value applications such as heat generation or as mulch. To the best of our knowledge, this study is the first one that scrutinises thermal insulation panels made from spruce bark fibres with different densities and fibre lengths manufactured in a wet process. The insulation boards with densities between 160 and 300 kg/m3 were self-bonded. Internal bond, thermal conductivity, and dimensional stability (thickness swelling and water absorption), together with formaldehyde content, were analysed. The thermal properties of the boards were directly correlated with the density and reached about 0.044 W/m*K, while the internal bond was rather influenced by the fibre length and was relatively low (on average 0.07 N/mm2). The water absorption was high (from 55% to 380%), while the thickness swelling remained moderate (up to 23%). The results of this study have shown that widely available bark residues can be successfully utilised as an innovative raw material for efficient eco-friendly thermal insulation products.

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“…As summarized by Rossel et al (2014), the main functions of bark are protection, transportation and storage of nutrients, insulation, and mechanical support of the stem. Due to undesired particle morphology and the fact that a lot of dirt, stones, and other unwanted contaminants, picked up during logging, can have a negative impact on processing, bark has generally been of low interest for wider industrial use, especially for the production of wood-based panels (Deppe & Hoffman, 1972;Pásztory et al, 2016).…”

Section: Uvod Introductionmentioning

confidence: 99%

Thermal conductivity of different bio-based insulation materials

Medved¹,

Tudor²,

Barbu³

et al. 2021

les-wood

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To achieve the zero-waste goal as well as sustainability, the use of the raw materials, especially those from nature, and wood in particular, has to be smart, meaning that the resource has to be used to its full potential. Since wood-based industry is associated with high intensity and the generation of a relatively large amount of residues, those residues should be used for the production of useful products, otherwise they will easily be classified as waste and afterwards used as a source of energy. To present a possible solution for wood residues like wood chips, wood particles and bark, we investigated the possibility of using wood and bark residues as constituents for the production of single layer insulation panel with a target thickness of 40 mm and target density of 0.2 g·cm-3. Thermal conductivity was determined using the steady state principle at three different temperature settings. The average thermal conductivities were determined between 49 mW·m-1·K-1 and 74 mW·m-1·K-1. The highest values were determined at boards made from bark, which also had the highest density (0,291 g·cm-3), while the lowest thermal conductivity was observed for boards made from spruce wood particles.

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The utilization of tree bark

Cited by 102 publications

References 119 publications

Insights for the Valorization of Biomass from Portuguese Invasive Acacia spp. in a Biorefinery Perspective

Insights for the Valorization of Biomass from Portuguese Invasive Acacia spp. in a Biorefinery Perspective

Binderless Thermal Insulation Panels Made of Spruce Bark Fibres

Thermal conductivity of different bio-based insulation materials

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