Size Reduction Downcycling of Waste Wood - A Review

Ihnát, Vladimír; Lübke, Henrich; Balberčák, Jozef; Kuňa, Vladimír

doi:10.37763/wr.1336-4561/65.2.205220

Cited by 35 publications

(33 citation statements)

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“…The wood waste from recycled composite materials should not be found in municipal waste landfills because of its possible degradation products responsible for damaging the environment [25][26][27][28]. It should be used as a material for new composites to become more environmentally friendly [25,27,[29][30][31][32][33][34].…”

Section: Introductionmentioning

confidence: 99%

Particleboards from Recycled Wood

Iždinský

Vidholdová

Reinprecht

2020

Forests

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The effective recovery of wood waste generated in wood processing and also at the end of wood product life is important from environmental and economic points of view. In a laboratory, 16 mm-thick three-layer urea–formaldehyde (UF)-bonded particleboards (PBs) were produced at 5.8 MPa and 240 °C and with an 8 s/mm pressing factor, using wood particles prepared from (1) fresh spruce wood (C), (2) a mixture of several recycled wood products (R1), and (3) recycled faulty PBs bonded with UF resin (R2). Particles from spruce wood were combined with particles from R1 or R2 recyclates in weight ratios of 100:0, 80:20, 50:50 and 0:100. In comparison to the control spruce PB, the PBs containing the R1 recyclate from old wood products were characterized by lower thickness swelling after 2 and 24 h (TS-2h and TS-24h), lower by 18 and 31%; water absorption after 2 and 24 h (WA-2h and WA-24h), lower by 33 and 28%; modulus of rupture in bending (MOR), lower by 28%; modulus of elasticity in bending (MOE), lower by 18%; internal bond (IB), lower by 33%; and resistance to decay determined by the mass loss under the action of the brown-rot fungus Coniophora puteana (Δm), lower by 32%. The PBs containing the R2 recyclate from faulty PBs were also characterized by a lower TS-2h and TS-24h, lower by 45% and 59%; WA-2h and WA-24h, lower by 61% and 51%; MOR, lower by 37%; MOE, lower by 17%; and IB, lower by 33%; however, their biological resistance to C. puteana was more effective, with a decreased Δm in the decay test, lower by 44%.

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Section: Introductionmentioning

confidence: 99%

Particleboards from Recycled Wood

Iždinský

Vidholdová

Reinprecht

2020

Forests

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“…Initial destruction of large dimension materials, thickness of 18 mm, was carried out by cutting to smaller pieces of approximately 100 mm × 100 mm. Disintegration of waste particle boards glued with UF adhesives was carried out on a wet (soaking in water/cooking) basis employing a process provided by our workplace (Ihnát et al, 2017). Samples of 100 × 100 mm particle boards bonded with UF glues without surface foils on either side were dipped/soaked and cooked in water and weighed to determine the water absorbance.…”

Section: Preparation Of Wood Chips From Waste Particle Boardsmentioning

confidence: 99%

“…with polyurethane since urea-formaldehyde resin is the main synthetic component in the fi breboard and particle board production and the obtained composite panels containing a certain amount of urea-formaldehyde resin and polyurethane show good mechanical properties (Liu et al, 2019). Additionally, researchers in our work group assume that the amounts of urea-formaldehyde resin from waste fi breboard and particle board materials gra-dually reduce after boiling water treatment due to its hydrolysis and the obtained materials with reduced urea-formaldehyde resin are suitable for the production of recycled and agglomerated materials (Ihnát et al, 2017;Ihnát et al, 2018). Recycled fi breboards can also be combined with other biomass species like straw pulp to prepare insulating fi breboards (Ihnát et al, 2015).…”

Section: Introductionmentioning

confidence: 96%

“…It is slightly heavier than air at room temperature and its releasing, especially from furniture boards, is strictly monitored. Just the amount of formaldehyde included in waste agglomerated boards signifi cantly reduces the possibility of their recycling (Ihnát et al, 2017). However, after a few decades of using fi breboards and particle boards their end-of-life comes and wood waste is formed.…”

Section: Introductionmentioning

confidence: 99%

“…Additionally, researchers in our work group assume that the amounts of urea-formaldehyde resin from waste fi breboard and particle board materials gra-dually reduce after boiling water treatment due to its hydrolysis and the obtained materials with reduced urea-formaldehyde resin are suitable for the production of recycled and agglomerated materials (Ihnát et al, 2017;Ihnát et al, 2018). Recycled fi breboards can also be combined with other biomass species like straw pulp to prepare insulating fi breboards (Ihnát et al, 2015). In Slovakia, commonly available softwood (Petráš et al, 2019) is used for the production of ag glomerated materials such as MDF and PB, especially spruce.…”

Section: Introductionmentioning

confidence: 99%

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Steam explosion of wood particles from fibreboard and particle board with indirect control by enzymatic hydrolysis

Pažitný

2019

Acta Chimica Slovaca

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Pretreatment of particles obtained from lignocellulosic materials by steam explosion with indirect control by enzymatic hydrolysis has been studied. The dendromass pretreatment model has been applied for recycled fibreboard and particle board based on softwood. Their structure and chemical composition partly predetermine these lignocellulosic materials consisting of a mixture of spruce and fir particles also for bioethanol production. Optimum steam explosion temperature of 205 °C was determined based on the concentration of total monosaccharides — glucose, xylose and arabinose, among all experimentally prepared hydrolysates. This corresponds to basic conditions for fine disintegration of biomass to lignocellulosic structure with good holocellulose accessibility. Particles obtained from fibreboard and particle board primarily consisting of softwood without steam explosion pretreatment provide relatively low cellulose accessibility for commercial enzymes activity while monosaccharides concentration is partly reduced because of torrefaction at high temperatures. The concentration of monosaccharides in hydrolysates was determined for original sample and each steam explosion temperature. Based on the steam explosion conditions, the effect of severity factors was investigated to find optimum pretreatment conditions to increase accessibility of softwood cellulose and hemicelluloses. The identified optimum severity factor RO = 4.09 matches the optimum steam explosion temperature of 205 °C and the residence time of 10 minutes.

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