The Experts below are selected from a list of 1110 Experts worldwide ranked by ideXlab platform

Eric Demeester - One of the best experts on this subject based on the ideXlab platform.

  • ETFA - Vision-based sorting of Medium Density Fibreboard and grade A wood waste
    2016 IEEE 21st International Conference on Emerging Technologies and Factory Automation (ETFA), 2016
    Co-Authors: Maarten Verheyen, Wim Beckers, Eric Claesen, Geert Moonen, Eric Demeester
    Abstract:

    Over the last few years, the use of Medium Density Fibreboard (MDF), oriented strand board (OSB) and other particleboard (grade B wood) has increased dramatically in the timber industry. This represents a major challenge for the wood recycling industry, which grinds this wood into chips to sell it to the wood chip industry. For this reason, the demand for an accurate, reliable, cheap and fast system that separates MDF, OSB and other particleboard material from quality wood in a mixed wood waste stream is huge, as this is still performed manually in many places. This paper presents a vision-based solution for such a wood waste sorting system. A main contribution of our work is an industry-ready, performance integration of state-of-the-art computer vision and machine learning techniques into a robust wood waste sorting setup. This system has been implemented in a Belgian company, where it runs 16 hours/day and processes 7.5 tons of wood waste per hour (reaching a Technology Readiness Level of 9). The return on investment was less than one year. From an input stream with 45% – 55% of grade B wood, two output streams are generated, one which contains less than 2% quality wood and one which contains less than 5% grade B wood.

  • Vision-based sorting of Medium Density Fibreboard and grade A wood waste
    2016 IEEE 21st International Conference on Emerging Technologies and Factory Automation (ETFA), 2016
    Co-Authors: Maarten Verheyen, Wim Beckers, Eric Claesen, Geert Moonen, Eric Demeester
    Abstract:

    Over the last few years, the use of Medium Density Fibreboard (MDF), oriented strand board (OSB) and other particleboard (grade B wood) has increased dramatically in the timber industry. This represents a major challenge for the wood recycling industry, which grinds this wood into chips to sell it to the wood chip industry. For this reason, the demand for an accurate, reliable, cheap and fast system that separates MDF, OSB and other particleboard material from quality wood in a mixed wood waste stream is huge, as this is still performed manually in many places. This paper presents a vision-based solution for such a wood waste sorting system. A main contribution of our work is an industry-ready, performance integration of state-of-the-art computer vision and machine learning techniques into a robust wood waste sorting setup. This system has been implemented in a Belgian company, where it runs 16 hours/day and processes 7.5 tons of wood waste per hour (reaching a Technology Readiness Level of 9). The return on investment was less than one year. From an input stream with 45% - 55% of grade B wood, two output streams are generated, one which contains less than 2% quality wood and one which contains less than 5% grade B wood.

Armin Thumm - One of the best experts on this subject based on the ideXlab platform.

  • Investigating the extent of urea formaldehyde resin cure in Medium Density Fibreboard: Characterisation of extractable resin components
    International Journal of Adhesion and Adhesives, 2014
    Co-Authors: Warren J. Grigsby, Armin Thumm, James E.p. Carpenter, Nancy Hati
    Abstract:

    Abstract Panel mass and nitrogen losses indicate Medium Density Fibreboard (MDF) panels bonded with differing urea formaldehyde (UF) resins readily lose some 40–70% of resin components on exposure to cold water soaking. Analysis reveals these labile extractable resin components to be low molecular weight UF oligomers which were not present in such amounts in the original UF resins. Panel emissions appear linked to the relative proportions of these extractable UF resin condensation products. Furthermore, results indicate that when applying resin to fibre, resin components may chromatographically separate and become unavailable to cross-link into a fully cured resin matrix. Differences in wood fibre extractives, resin chemistry or application methodology gave minor differences in extractable resin components, but a greater resin loading contributed to lower relative resin extractability.

  • steam fibre and resin dynamics within a Medium Density Fibreboard mdf blowline
    Appita Journal: Journal of the Technical Association of the Australian and New Zealand Pulp and Paper Industry, 2014
    Co-Authors: Karl Murton, Warren J. Grigsby, Armin Thumm
    Abstract:

    The effects of blowline steam velocity, resin injection nozzle type and position were determined by injecting fluorescently labelled urea formaldehyde resin into a blowline and examining the resin distribution on the fibre using confocal microscopy. The key results are: Pressure drop within the blowline is 2.5 times greater with fibre present (normal operation) than for steam only. Resin coverage increases with greater steam flow through the blowline. - Resin coverage decreased when the resin injection nozzle was shifted from the conventional position after the blow valve to the end of the blowline. - Resin coverage increases if emulsified wax is mixed with the resin prior to injection. - The blowline steam flow and resin injection position have a greater effect on the resin coverage than the nozzle type for the blowline used.

  • Resin and wax distribution and mobility during Medium Density Fibreboard manufacture
    European Journal of Wood and Wood Products, 2012
    Co-Authors: Warren J. Grigsby, Armin Thumm
    Abstract:

    Fluorescently labelled UF resin and paraffin wax have been used at a Medium Density Fibreboard (MDF) production facility to characterise resin and wax distribution and mobility on MDF fibre and panels. The major findings from these comprehensive mill-scale trials have been the mobility of UF resin on fibre throughout the MDF process, while wax mobility occurs only on panel pressing. Complex interactions exist between resin distribution and wood fibre wall penetration which collectively provide evidence for three-dimensional resin movement on fibre through the production process. Fibre exiting the blowline had relatively high rates of resin coverage with resin droplet sizes dominated by the process of resin smearing through fibre-fibre contacts. On passing through the dryer resin coverage of fibre reduces, before increasing again on panel pressing. Wax distribution on unpressed fibre was dependent on the mode of application with emulsion and slack wax addition at the refiner being relatively similar, but differing to emulsified wax added via the blowline. On pressing, wax distribution in panels was distinguished by wax type, and was independent of the addition points. Unter Verwendung von fluoreszenzmarkiertem Harnstoffharz und Paraffin wurden in einem MDF-Werk die Verteilung und Ausbreitung von Klebstoff und Wachs auf Fasern und MDF-Platten untersucht. Die Ergebnisse dieser umfangreichen Untersuchung im Industriemaßstab zeigten, dass sich Harnstoffharz während der gesamten Plattenherstellung auf den Fasern ausbreitet, während sich Wachs nur während des Pressvorgangs der Platten ausbreitet. Zwischen der Harzverteilung und der Eindringung in die Holzzellwände bestehen komplexe Wechselbeziehungen, die die dreidimensionale Ausbreitung auf der Faseroberfläche bei der Herstellung belegen. Nach der Blowline-Beleimung wiesen die Fasern eine relativ hohe Harzbedeckung auf, wobei die Größe der Harztröpfchen durch die Verschmierungen infolge des Aneinanderreibens der Fasern bestimmt wurde. Während der Trocknung nimmt die Harzbedeckung der Fasern ab und beim Pressen der Platten wieder zu. Die Wachsverteilung ungepresster Fasern hing von der Art des Auftrags ab, wobei die Verteilung bei der Zugabe von Emulsion und Rohparaffin im Refiner ähnlich war, jedoch bei der Zugabe von emulgiertem Wachs in der Blowline deutlich unterschiedlich. Beim Pressen unterschied sich die Wachsverteilung in den Platten je nach Wachsart, war jedoch unabhängig davon, wo das Wachs zugegeben wurde.

  • The interactions between wax and UF resin in Medium Density Fibreboard
    European Journal of Wood and Wood Products, 2011
    Co-Authors: Warren J. Grigsby, Armin Thumm
    Abstract:

    Through the use of fluorescently labelled paraffin wax and UF resin, fluorescence microscopy has been used to simultaneously visualise wax and resin components on Medium Density Fibreboard (MDF) fibre. To simulate differing application methods, the wax and resin were applied to fibre either separately or as a mixture. Visualisation on unpressed fibre and in panels suggests the application order can lead to differing wax-resin behaviours and how each interact with fibre. Both qualitative and quantitative analyses of wax and resin distribution on fibre established that the main differences in behaviours were due to wax and occur on pressing. Applying wax first to fibre led to wax droplet agglomeration in panels whereas applying wax after resin or as a mixture appeared to allow wax to be retained as relatively smaller droplets within the resin matrix. This also manifested itself in differences in wax overlap with resin in panels, where a relatively low overlap was observed when applying wax first, despite a substantially higher overlap in unpressed fibre. Application of wax after resin or as a mixture resulted in the wax generally staying with the resin. The observed differences in wax distribution were also correlated with panel cold water soak properties.

  • Resin and wax distribution and mobility during Medium Density Fibreboard manufacture
    European Journal of Wood and Wood Products, 2011
    Co-Authors: Warren J. Grigsby, Armin Thumm
    Abstract:

    Fluorescently labelled UF resin and paraffin wax have been used at a Medium Density Fibreboard (MDF) production facility to characterise resin and wax distribution and mobility on MDF fibre and panels. The major findings from these comprehensive mill-scale trials have been the mobility of UF resin on fibre throughout the MDF process, while wax mobility occurs only on panel pressing. Complex interactions exist between resin distribution and wood fibre wall penetration which collectively provide evidence for three-dimensional resin movement on fibre through the production process. Fibre exiting the blowline had relatively high rates of resin coverage with resin droplet sizes dominated by the process of resin smearing through fibre-fibre contacts. On passing through the dryer resin coverage of fibre reduces, before increasing again on panel pressing. Wax distribution on unpressed fibre was dependent on the mode of application with emulsion and slack wax addition at the refiner being relatively similar, but differing to emulsified wax added via the blowline. On pressing, wax distribution in panels was distinguished by wax type, and was independent of the addition points.

Hamid Aknouche - One of the best experts on this subject based on the ideXlab platform.

  • Applications of CrAlN ternary system in wood machining of Medium Density Fibreboard (MDF)
    Wear, 2009
    Co-Authors: Yacine Benlatreche, Corinne Nouveau, Rémy Marchal, Jean-paul Ferreira Martins, Hamid Aknouche
    Abstract:

    Nowadays, Medium Density Fibreboard (MDF) composite wood is more and more used in the furniture industry to replace bulk wood such as oak, beech, etc. Indeed, this material presents good mechanical properties, is easy to machine, homogeneous, exists in different dimensions (thickness, etc.), is cheaper than bulk wood and finally can be covered by an adhesive decorative coat. Nevertheless, even if this material is homogeneous, it is abrasive enough to tend to the breakdown of the conventional carbide tools employed during its routing process. That is why it is necessary to improve the wear resistance of these tools. One solution is to protect them with a hard coating. The present study deals with the development of ternary CrAlN hard layers obtained by PVD method on carbide tools employed in second transformation of wood. CrAlN coatings have been optimized and then applied on carbide tools in routing of three types of MDF: standard, waterproof and fireproof. The aim of these wood machining tests was first to define the ability to be machined of the three kinds of MDF and second to compare the effectiveness of CrAlN coatings during the routing tests of these materials.

  • Applications of CrAlN ternary system in wood machining of Medium Density Fibreboard (MDF)
    Wear, 2009
    Co-Authors: Yacine Benlatreche, Corinne Nouveau, Rémy Marchal, Jean-paul Ferreira Martins, Hamid Aknouche
    Abstract:

    Nowadays, Medium Density Fibreboard (MDF) composite wood is more and more used in the furniture industry to replace bulk wood such as oak, beech, etc. Indeed, this material presents good mechanical properties, is easy to machine, homogeneous, exists in different dimensions (thickness, etc.), is cheaper than bulk wood and finally can be covered by an adhesive decorative coat. Nevertheless, even if this material is homogeneous, it is abrasive enough to tend to the breakdown of the conventional carbide tools employed during its routing process. That is why it is necessary to improve the wear resistance of these tools. One solution is to protect them with a hard coating. The present study deals with the development of ternary CrAlN hard layers obtained by PVD method on carbide tools employed in second transformation of wood. CrAlN coatings have been optimized and then applied on carbide tools in routing of three types of MDF: standard, waterproof and fireproof. The aim of these wood machining tests was first to define the ability to be machined of the three kinds of MDF and second to compare the effectiveness of CrAlN coatings during the routing tests of these materials.ISOROY of St-Dizier (France

Soeren Halvarsson - One of the best experts on this subject based on the ideXlab platform.

Magnus Norgren - One of the best experts on this subject based on the ideXlab platform.