Feasibility of substituting core layer strands in randomly OSB with contaminated waste wood particles

Author(s):  
Anna Schild ◽  
Julie Cool ◽  
Marius-Catalin Barbu ◽  
Gregory D. Smith
Holzforschung ◽  
2013 ◽  
Vol 67 (3) ◽  
pp. 285-290 ◽  
Author(s):  
Chung Y. Hse ◽  
Todd F. Shupe ◽  
Bin Yu

Abstract Recovery of metals from chromated copper arsenate (CCA)-treated southern pine wood particles was investigated by extraction in a microwave reactor with binary combinations of acetic acid (AA), oxalic acid (OxA), and phosphoric acid (PhA). Use of OxA was not successful, as insoluble copper oxalate complexes impeded copper removal. The combination of OxA and AA also had adverse effects on copper extraction. In contrast, the combination of AA and PhA enhanced the chromium recovery rate. The highest recovery rate of metals could be achieved with a mixture of 2.75% PhA and 0.5% AA at 130°C for 10 min in the microwave oven. The total recovery rate approached 100% for arsenic, 96.7% for chromium, and 98.6% for copper in a one-step process.


Holzforschung ◽  
2008 ◽  
Vol 62 (2) ◽  
pp. 215-222 ◽  
Author(s):  
Heiko Thoemen ◽  
André Klueppel

Abstract In wood-based composite mats, mass and heat transfer are substantially influenced by their gas permeability. Thus, reliable permeability data are needed if one wants to model and simulate those processes taking place prior, during, and after hot-pressing operations of the mat. In this study, wood particles of surface and core layer type were obtained from two particleboard manufacturers, using impact mills and knife ring flakers, respectively. The permeability measurements were performed on the initial materials, as well as on subsets of it obtained by laboratory sieving. Additionally, medium density fibreboard (MDF) fibres from three species, namely pine (Pinus sylvestris), spruce (Picea abies) and rubberwood (Hevea Brasiliensis) were investigated. Cross-sectional and within-plane permeability was measured for densities from 250 to 1000 kg m-3. The permeability of the core particle materials was determined on solidified samples. On the other hand, the surface particles and MDF fibres were investigated by means of a rapid testing method on loose furnish materials (without solidification). MDF mats exhibited lower permeability values than particle mats at low densities, but values were found in the same order of magnitude for high densities. Mainly, the small particles determine the pore structure and permeability of particle mats. Thickness and in-plane size of particles affect the mat permeability, with the in-plane size becoming primarily effective at elevated densities. The permeability of MDF fibre mats depends more on the anatomy of the raw material than on its size distribution. We suggest, based on computer simulations, that only the within-plane permeability has a strong effect on gas pressure and temperature conditions during hot pressing. The cross-sectional permeability does not play an essential role in this regard.


Holzforschung ◽  
2013 ◽  
Vol 67 (2) ◽  
pp. 169-175 ◽  
Author(s):  
Ali Shalbafan ◽  
Jan Luedtke ◽  
Johannes Welling ◽  
Arno Fruehwald

Abstract Ultra-lightweight foam core particleboards have been produced in a novel one-step process with resinated wood particles for the faces and expandable polystyrene (EPS) as core layer material. The mechanical and physical properties of panels were investigated in terms of the different foam core densities and press parameters (temperature, pressing and foaming time). The bending strength properties of the panels were not significantly changed with increasing foam core density from 80 to 120 kg m-3. Panels produced at a press temperature of 130°C (1-EPS) have an improved core-face interface and also a denser surface layer, which positively influences the internal bond and thickness swelling. The panels produced at a press temperature of 160°C (2-EPS) have smaller and more foam cells and an improved fusion of foam beads and properties, which have a positive influence on the edge screw withdrawal resistance and water absorption.


2010 ◽  
Vol 113-116 ◽  
pp. 674-678
Author(s):  
Hai Gang Wang ◽  
Qing Wen Wang ◽  
Yan Jun Xie ◽  
Yong Ming Song

Waste wood particles of different shapes were used to reinforce high density polyethylene (HDPE) to prepare high performance wood/plastic composites (WPC). The wood particles showed a needle-, flake-, strand-, and powder-shape, respectively. The mechanical and water-uptake properties of the composites manufactured using extrusion were tested. The wood needles/HDPE composites (WN-WPC) exhibited slightly higher mechanical strengths and lower density than the composites with the other shapes of wood particles. When the flake-, strand-, and powder-shaped wood particles were replaced by wood needles, the flexural, tensile and impact strengths were increased approximately by 4.24%, 7.61%, and 16.6% on average, respectively, and the density was decreased by about 7.34%. The length and width of WPC specimens changed little when soaked in water, with the thickening on the edge area only. WN-WPC performed the best waterproof stability. Based on the experimental results, the wood needles with lager length-to-diameter ratio would be the most suitable for producing high performance WPC.


2001 ◽  
Vol 40 (1) ◽  
pp. 393-397 ◽  
Author(s):  
Joaquín Reina ◽  
Enrique Velo ◽  
Luis Puigjaner

2020 ◽  
Vol 22 (15) ◽  
pp. 5032-5041 ◽  
Author(s):  
Florence J. V. Gschwend ◽  
Louis M. Hennequin ◽  
Agnieszka Brandt-Talbot ◽  
Franky Bedoya-Lora ◽  
Geoffrey H. Kelsall ◽  
...  

In the present study, we used a low-cost protic ionic liquid, 1-methylimidazolium chloride, to simultaneously fractionate heavy metal contaminated wood and extract the metals from the wood at elevated temperature and short reaction time.


Materials ◽  
2021 ◽  
Vol 14 (17) ◽  
pp. 4781
Author(s):  
Radosław Mirski ◽  
Dorota Dukarska ◽  
Joanna Walkiewicz ◽  
Adam Derkowski

A significant part of the work carried out so far in the field of production of biocomposite polyurethane foams (PUR) with the use of various types of lignocellulosic fillers mainly concerns rigid PUR foams with a closed-cell structure. In this work, the possibility of using waste wood particles (WP) from primary wood processing as a filler for PUR foams with open-cell structure was investigated. For this purpose, a wood particle fraction of 0.315–1.25 mm was added to the foam in concentrations of 0, 5, 10, 15 and 20%. The foaming course of the modified PUR foams (PUR-WP) was characterized on the basis of the duration of the process’ successive stages at the maximum foaming temperature. In order to explain the observed phenomena, a cellular structure was characterized using microscopic analysis such as SEM and light microscope. Computed tomography was also applied to determine the distribution of wood particles in PUR-WP materials. It was observed that the addition of WP to the open-cell PUR foam influences the kinetics of the foaming process of the PUR-WP composition and their morphology, density, compressive strength and thermal properties. The performed tests showed that the addition of WP at an the amount of 10% leads to the increase in the PUR foam’s compressive strength by 30% (parallel to foam’s growth direction) and reduce the thermal conductivity coefficient by 10%.


Polymers ◽  
2021 ◽  
Vol 13 (11) ◽  
pp. 1752
Author(s):  
Arnaud Besserer ◽  
Sarah Troilo ◽  
Pierre Girods ◽  
Yann Rogaume ◽  
Nicolas Brosse

Wood is an increasingly demanded renewable resource and an important raw material for construction and materials. In addition, new consumption habits are leading to the production of ever greater volumes of waste wood, which constitutes a feedstock that can be mobilized for the cascade production of new materials such as particleboard. However, current legislation and wood waste recycling processes need to be improved in order to maximize the volumes that can be reused and to upgrade the properties of the recycled wood. This review describes wood waste flows and volumes available in Europe, the current French and European legislation, and the innovations under development in this field: innovative automated sorting techniques, physical-chemical processes for cleaning residual glue from the surface of wood particles, cleaning of MDF, and bioremediation processes for cleaning hazardous wood contaminated by heavy metals or creosote.


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