The Experts below are selected from a list of 102 Experts worldwide ranked by ideXlab platform

Antonio Pizzi - One of the best experts on this subject based on the ideXlab platform.

  • Causes for the Improved Water Resistance in Pine Wood Linear Welded Joints
    Journal of Adhesion Science and Technology, 2011
    Co-Authors: H. R. Mansouri, Jean-michel Leban, L. Delmotte, O. Lindgren, Antonio Pizzi, M. Vaziri
    Abstract:

    Linear Vibration Welding of good quality pine (Pinus sylvestris) wood from Sweden containing a small proportion of a native mixture of terpenoic acids, known under the collective name of rosin, has been shown to yield joints of much upgraded water resistance. This has been shown to be due to the protecting influence the molten rosin from the wood itself has on the welded interphase, because of the water repellency of rosin. Joints of unusually high percentage wood failure but modest strength were obtained, rosin apparently reinforcing the welded interphase to yield weldline strengths always much higher than the strength of the surrounding wood.

  • Enhancing the Exterior Performance of Wood Joined by Linear and Rotational Welding
    Journal of Adhesion Science and Technology, 2011
    Co-Authors: Antonio Pizzi, H. R. Mansouri, Jean-michel Leban, L. Delmotte, F. Pichelin
    Abstract:

    Application of rosin, a wood derived, non-toxic, natural, inexpensive and easily and abundantly available natural material, to the wood faces to be joined by either Linear Vibration Welding or rotational dowel Welding has shown to greatly enhance the water resistance of welded wood joints. The method of application has been shown to have a marked effect on the results, with the application and drying of a diluted rosin solution to the wood surfaces before Welding yielding the best results. The considerable improvement in water resistance does not still allow classification of the joints as fully exterior grade. However, dowel Welding can now be used for protected exterior joints due to a combination of rosin waterproofing and joint geometry. Welded dowel joints holding together for longer than 455 days immersion in water indicate this to be the case. Rosin-treated Linear Vibration joints held together well in excess of 30 days but retained a measurable strength, in the best case, only up to 18 days water ...

  • Enhancing the exterior performance of wood joined by Linear and rotational Welding
    Journal of Adhesion Science and Technology, 2011
    Co-Authors: Antonio Pizzi, H. R. Mansouri, Jean-michel Leban, L. Delmotte, F. Pichelin
    Abstract:

    Application of rosin, a wood derived, non-toxic, natural, inexpensive and easily and abundantly available natural material, to the wood faces to be joined by either Linear Vibration Welding or rotational dowel Welding has shown to greatly enhance the water resistance of welded wood joints. The method of application has been shown to have a marked effect on the results, with the application and drying of a diluted rosin solution to the wood surfaces before Welding yielding the best results. The considerable improvement in water resistance does not still allow classification of the joints as fully exterior grade. However, dowel Welding can now be used for protected exterior joints due to a combination of rosin waterproofing and joint geometry. Welded dowel joints holding together for longer than 455 days immersion in water indicate this to be the case. Rosin-treated Linear Vibration joints held together well in excess of 30 days but retained a measurable strength, in the best case, only up to 18 days water immersion. The wood anatomy and chemical reasons for the effect of rosin were determined by X-ray microdensitometry and CP-MAS (13)C-NMR analysis.

  • Emission gases in Linear Vibration Welding of wood
    Journal of Adhesion Science and Technology, 2009
    Co-Authors: P. Omrani, Antonio Pizzi, E. Masson, H. R. Mansouri
    Abstract:

    Analysis of the gases, vapour and degradation volatiles emitted as smoke from the Welding interface during Linear Vibration Welding of beech and oak woods has shown that the compounds in such a smoke are water vapour, CO2, and degradation compounds from wood polymeric carbohydrates as well as from amorphous lignin. For the two hardwoods tested the main carbohydrates contributing to the volatile compounds are xylan hemicelluloses. Numerous compounds, in very small proportions, derived from the degradation and rearrangement reactions of lignin have also been identified. The proportion of CO2 emitted is very low, and neither CO nor methane are emitted due to the relatively low temperature reached. Experiments in the temperature range of Linear wood Welding but at prolonged time have shown that the main component of the smoke produced during Welding appears to be water vapour. There is no emission of gases or degradation volatiles after Welding has ended.

  • Edge and face Linear Vibration Welding of wood panels
    European Journal of Wood and Wood Products, 2007
    Co-Authors: C. Ganne-chedeville, Jean-michel Leban, M. Properzi, Antonio Pizzi, F. Pichelin
    Abstract:

    Edge-to-edge Linear Vibration Welding of particleboard, OSB, MDF and plywood gives better strength than face-to-face panel Welding. In general, the edge-to-edge weldline is slightly weaker than the panels itself. The face-to-face weldline is stronger than the strength of the material in the same direction.

Jean-michel Leban - One of the best experts on this subject based on the ideXlab platform.

  • Causes for the Improved Water Resistance in Pine Wood Linear Welded Joints
    Journal of Adhesion Science and Technology, 2011
    Co-Authors: H. R. Mansouri, A. Pizzi, Jean-michel Leban, L. Delmotte, O. Lindgren, M. Vaziri
    Abstract:

    Linear Vibration Welding of good quality pine (Pinus sylvestris) wood from Sweden containing a small proportion of a native mixture of terpenoic acids, known under the collective name of rosin, has been shown to yield joints of much upgraded water resistance. This has been shown to be due to the protecting influence the molten rosin from the wood itself has on the welded interphase, because of the water repellency of rosin. Joints of unusually high percentage wood failure but modest strength were obtained, rosin apparently reinforcing the welded interphase to yield weldline strengths always much higher than the strength of the surrounding wood. (C) Koninklijke Brill NV, Leiden, 2011.

  • Causes for the Improved Water Resistance in Pine Wood Linear Welded Joints
    Journal of Adhesion Science and Technology, 2011
    Co-Authors: H. R. Mansouri, Jean-michel Leban, L. Delmotte, O. Lindgren, Antonio Pizzi, M. Vaziri
    Abstract:

    Linear Vibration Welding of good quality pine (Pinus sylvestris) wood from Sweden containing a small proportion of a native mixture of terpenoic acids, known under the collective name of rosin, has been shown to yield joints of much upgraded water resistance. This has been shown to be due to the protecting influence the molten rosin from the wood itself has on the welded interphase, because of the water repellency of rosin. Joints of unusually high percentage wood failure but modest strength were obtained, rosin apparently reinforcing the welded interphase to yield weldline strengths always much higher than the strength of the surrounding wood.

  • Enhancing the Exterior Performance of Wood Joined by Linear and Rotational Welding
    Journal of Adhesion Science and Technology, 2011
    Co-Authors: Antonio Pizzi, H. R. Mansouri, Jean-michel Leban, L. Delmotte, F. Pichelin
    Abstract:

    Application of rosin, a wood derived, non-toxic, natural, inexpensive and easily and abundantly available natural material, to the wood faces to be joined by either Linear Vibration Welding or rotational dowel Welding has shown to greatly enhance the water resistance of welded wood joints. The method of application has been shown to have a marked effect on the results, with the application and drying of a diluted rosin solution to the wood surfaces before Welding yielding the best results. The considerable improvement in water resistance does not still allow classification of the joints as fully exterior grade. However, dowel Welding can now be used for protected exterior joints due to a combination of rosin waterproofing and joint geometry. Welded dowel joints holding together for longer than 455 days immersion in water indicate this to be the case. Rosin-treated Linear Vibration joints held together well in excess of 30 days but retained a measurable strength, in the best case, only up to 18 days water ...

  • Enhancing the exterior performance of wood joined by Linear and rotational Welding
    Journal of Adhesion Science and Technology, 2011
    Co-Authors: Antonio Pizzi, H. R. Mansouri, Jean-michel Leban, L. Delmotte, F. Pichelin
    Abstract:

    Application of rosin, a wood derived, non-toxic, natural, inexpensive and easily and abundantly available natural material, to the wood faces to be joined by either Linear Vibration Welding or rotational dowel Welding has shown to greatly enhance the water resistance of welded wood joints. The method of application has been shown to have a marked effect on the results, with the application and drying of a diluted rosin solution to the wood surfaces before Welding yielding the best results. The considerable improvement in water resistance does not still allow classification of the joints as fully exterior grade. However, dowel Welding can now be used for protected exterior joints due to a combination of rosin waterproofing and joint geometry. Welded dowel joints holding together for longer than 455 days immersion in water indicate this to be the case. Rosin-treated Linear Vibration joints held together well in excess of 30 days but retained a measurable strength, in the best case, only up to 18 days water immersion. The wood anatomy and chemical reasons for the effect of rosin were determined by X-ray microdensitometry and CP-MAS (13)C-NMR analysis.

  • Edge and face Linear Vibration Welding of wood panels
    European Journal of Wood and Wood Products, 2007
    Co-Authors: C. Ganne-chedeville, Jean-michel Leban, M. Properzi, Antonio Pizzi, F. Pichelin
    Abstract:

    Edge-to-edge Linear Vibration Welding of particleboard, OSB, MDF and plywood gives better strength than face-to-face panel Welding. In general, the edge-to-edge weldline is slightly weaker than the panels itself. The face-to-face weldline is stronger than the strength of the material in the same direction.

Koichi Hasegawa - One of the best experts on this subject based on the ideXlab platform.

Alois K. Schlarb - One of the best experts on this subject based on the ideXlab platform.

  • Improved weld strength of Vibration welded polyoxymethylene/multiwalled carbon nanotubes hybrid nanocomposites
    Polymer Engineering and Science, 2016
    Co-Authors: Leyu Lin, Alois K. Schlarb
    Abstract:

    In this study, carbon nanotubes reinforced polyoxymethylene with different filler loadings was joined by using Linear Vibration Welding technique. The tensile properties of Vibration welded polyoxymethylene nanocomposites with different carbon nanotube contents were studied as functions of filler loading and weld pressure. The results showed that the addition of carbon nanotubes into polyoxymethylene slightly improved the matrix tensile strength and pronounced decreased the ductility of pure polyoxymethylene. Interestingly, the weld strength of the nanocomposites was also higher than the polymer matrix strength even at high weld pressure of 2 MPa. Possible reasons for this high weld strength are discussed based on the morphological investigations. POLYM. ENG. SCI., 2016. © 2016 Society of Plastics Engineers

  • Vibration Welding of polypropylene-based nanocomposites – The crucial stage for the weld quality
    Composites Part B: Engineering, 2015
    Co-Authors: Leyu Lin, Alois K. Schlarb
    Abstract:

    Abstract Thermoplastic nanocomposites used for Vibration Welding are compounded on a twin-screw extruder by dilution of a concentrate masterbatch containing 14 vol% of filler. They are butt welded under different weld pressures by a Linear Vibration Welding machine. By means of a quick ramp-down technology, this machine enables a very short Vibration damping time of about 40 ms. The influence of different damping time on the weld strength of various materials is investigated. The experimental results are compared also with the results of simulation. In the case of nano-silica filled polypropylene, no impact of the damping time on the weld quality is detected and the possible reasons for this observation are explained.

  • Vibration Welding of nano‐TiO2 filled polypropylene
    Polymer Engineering & Science, 2014
    Co-Authors: Leyu Lin, Alois K. Schlarb
    Abstract:

    Polypropylene (PP)-based nanocomposites compounded by a twin-screw extruder and injection molded into plates those were then joined by Linear Vibration Welding. The mechanical performances of the welds and bulk materials were examined. While the incorporation of rigid particles slightly improves the impact strength of the bulk PP, the mechanical properties of the welds decrease with increasing nanoparticle contents. The best weld quality is obtained at low weld pressure without nanoparticles. The fracture surfaces and microstructure of the welds showed that the reduced weld quality is caused by the orientation of nanofillers parallel to the weld plane, the destruction of interphase between fillers and matrix, and the reduction of molten-film thickness by incorporation of nanoparticles. POLYM. ENG. SCI., 55:243–250, 2015. © 2014 Society of Plastics Engineers

  • Vibration Welding of alpha and beta isotactic polypropylenes mechanical properties and structure
    Express Polymer Letters, 2008
    Co-Authors: Jozsef Varga, G W Ehrenstein, Alois K. Schlarb
    Abstract:

    Propylene homo- and copolymers (both random and block types) with and without beta nucleation were injection moulded and the related plaques joined by Linear Vibration Welding. The melt flow index (MFI) of the polypropylenes was different. During Vibration Welding the pressure has been varied (0.5, 2 and 8 MPa). The properties of the welded plaques were determined under both static (tensile) and dynamic conditions (Charpy impact). It was found that the mechanical per- formance of the welds could strongly be improved when beta nucleated PP plaques were combined with each other. In other combinations the 'weaker' alpha modification controls the mechanical response. The supermolecular structure of the weld was assessed by polarised light microscopy using thin microtomed sections. Formations of the weld morphology along with its effects on the mechanical performance were discussed.

A. Pizzi - One of the best experts on this subject based on the ideXlab platform.

  • Wood-bamboo-wood laminated composite lumber jointed by Linear Vibration-friction Welding
    European Journal of Wood and Wood Products, 2013
    Co-Authors: A. Pizzi
    Abstract:

    The Linear Vibration-friction Welding offers several advantages compared to traditional mechanical fasteners or gluing. This study examines the possibility of applying mechanically-induced Vibration Welding to the joining procedure of a wood-bamboo sandwich-laminated composite. The result shows that average tensile strength values of the composites can meet the requirements of the furniture industry and even for wood construction. The X-ray microdensitometry analyses indicated an increase in density of the interfacial material between the wood substrate and the bamboo substrate. Furthermore the peak of the density profile between wood and bamboo outer layer is lower than that between wood and bamboo inner layer. This paper proves that the sandwich wood-bamboo Welding lumber can be efficiently fabricated by Linear Vibration Welding without any adhesive.

  • Wood–bamboo–wood laminated composite lumber jointed by Linear Vibration–friction Welding
    European Journal of Wood and Wood Products, 2013
    Co-Authors: A. Pizzi
    Abstract:

    The Linear Vibration–friction Welding offers several advantages compared to traditional mechanical fasteners or gluing. This study examines the possibility of applying mechanically-induced Vibration Welding to the joining procedure of a wood–bamboo sandwich-laminated composite. The result shows that average tensile strength values of the composites can meet the requirements of the furniture industry and even for wood construction. The X-ray microdensitometry analyses indicated an increase in density of the interfacial material between the wood substrate and the bamboo substrate. Furthermore the peak of the density profile between wood and bamboo outer layer is lower than that between wood and bamboo inner layer. This paper proves that the sandwich wood–bamboo Welding lumber can be efficiently fabricated by Linear Vibration Welding without any adhesive.

  • Causes of the Water Resistance of Welded Joints of Paduk Wood (Pterocarpus soyauxii Taub.)
    Journal of Renewable Materials, 2013
    Co-Authors: T. Ganier, J. Hu, A. Pizzi
    Abstract:

    Linear Vibration Welding of extractive rich Paduk wood from central Africa containing a high proportion of a native mixture of water-insoluble extractives, or of low water solubility, has been shown to yield joints of much upgraded water resistance. This has been shown to be due to the protecting influence the extractives from the wood itself has on the welded interphase, due to their inherent water repellence. Joints of unusually high percentage wood failure but modest strength were obtained; Paduk wood brittleness apparently yielding weld line strengths always higher than that of the surrounding wood itself. This indicated that Paduk wood welded joints present enhanced weather exposure durability in relation to welded joints using other species of wood.

  • Causes for the Improved Water Resistance in Pine Wood Linear Welded Joints
    Journal of Adhesion Science and Technology, 2011
    Co-Authors: H. R. Mansouri, A. Pizzi, Jean-michel Leban, L. Delmotte, O. Lindgren, M. Vaziri
    Abstract:

    Linear Vibration Welding of good quality pine (Pinus sylvestris) wood from Sweden containing a small proportion of a native mixture of terpenoic acids, known under the collective name of rosin, has been shown to yield joints of much upgraded water resistance. This has been shown to be due to the protecting influence the molten rosin from the wood itself has on the welded interphase, because of the water repellency of rosin. Joints of unusually high percentage wood failure but modest strength were obtained, rosin apparently reinforcing the welded interphase to yield weldline strengths always much higher than the strength of the surrounding wood. (C) Koninklijke Brill NV, Leiden, 2011.