The Experts below are selected from a list of 39 Experts worldwide ranked by ideXlab platform

Chiaki Sato - One of the best experts on this subject based on the ideXlab platform.

  • high frequency Welding of glass fibre reinforced polypropylene with a thermoplastic adhesive layer effects of ceramic type and long term exposure on lap shear strength
    International Journal of Adhesion and Adhesives, 2015
    Co-Authors: Masaru Sano, Hiroyuki Oguma, Masahiro Sekine, Yu Sekiguchi, Chiaki Sato
    Abstract:

    Abstract In this study, High-Frequency (HF) Welding of glass–fibre-reinforced polypropylene (GF/PP) with thermoplastic adhesive layers consisting of zinc oxide (ZnO), anatase-type titanium oxide or silicon carbide was investigated. Effects of the ceramic type and content on the dielectric and temperature characteristics of these adhesive layers were evaluated experimentally, and the ratio of the dielectric loss tangent to the relative dielectric permittivity (tan δ / e ′), which was the index of the HF heating efficiency, exhibited different tendencies by these parameters. This value increased rapidly with increasing temperature even at 10 vol% ZnO, suggesting that the heating of the adhesive layer may be accelerated by combining temperature rise with a small amount of ZnO. During the HF Welding process, the ZnO-containing adhesive layer bound to GF/PP in the shortest time (18 s) with high bond strength (~14 MPa). The effects of temperature (50 °C) and moisture (80% relative humidity) on the mechanical strength of the HF-welded specimens after a long-term exposure were also examined.

  • high frequency Welding of glass fiber reinforced polypropylene with a thermoplastic adhesive layer including sic
    International Journal of Adhesion and Adhesives, 2014
    Co-Authors: Masaru Sano, Hiroyuki Oguma, Masahiro Sekine, Chiaki Sato
    Abstract:

    Abstract In this study, High-Frequency (HF) Welding of glass-fiber-reinforced polypropylene (GF/PP) was investigated with thermoplastic adhesive layers including SiC, which is able to heat by HF irradiation. The influences of SiC particle size and content on the dielectric properties of an adhesive layer were investigated experimentally. The influence of temperature on the tan  δ / e ′ value was also investigated. In the HF Welding process of GF/PP bonded with the thermoplastic adhesive layer, the effects of SiC content and particle size on the Welding properties were examined. The GF/PP was completely welded in a short time when SiC with small particle size and high content was included in the adhesive and a good bond strength was also achieved. Thus, short time and high bond strength for the Welding were achieved with the method using a thermoplastic adhesive layer with high tan  δ / e ′ value.

Masaru Sano - One of the best experts on this subject based on the ideXlab platform.

  • high frequency Welding of glass fibre reinforced polypropylene with a thermoplastic adhesive layer effects of ceramic type and long term exposure on lap shear strength
    International Journal of Adhesion and Adhesives, 2015
    Co-Authors: Masaru Sano, Hiroyuki Oguma, Masahiro Sekine, Yu Sekiguchi, Chiaki Sato
    Abstract:

    Abstract In this study, High-Frequency (HF) Welding of glass–fibre-reinforced polypropylene (GF/PP) with thermoplastic adhesive layers consisting of zinc oxide (ZnO), anatase-type titanium oxide or silicon carbide was investigated. Effects of the ceramic type and content on the dielectric and temperature characteristics of these adhesive layers were evaluated experimentally, and the ratio of the dielectric loss tangent to the relative dielectric permittivity (tan δ / e ′), which was the index of the HF heating efficiency, exhibited different tendencies by these parameters. This value increased rapidly with increasing temperature even at 10 vol% ZnO, suggesting that the heating of the adhesive layer may be accelerated by combining temperature rise with a small amount of ZnO. During the HF Welding process, the ZnO-containing adhesive layer bound to GF/PP in the shortest time (18 s) with high bond strength (~14 MPa). The effects of temperature (50 °C) and moisture (80% relative humidity) on the mechanical strength of the HF-welded specimens after a long-term exposure were also examined.

  • high frequency Welding of glass fiber reinforced polypropylene with a thermoplastic adhesive layer including sic
    International Journal of Adhesion and Adhesives, 2014
    Co-Authors: Masaru Sano, Hiroyuki Oguma, Masahiro Sekine, Chiaki Sato
    Abstract:

    Abstract In this study, High-Frequency (HF) Welding of glass-fiber-reinforced polypropylene (GF/PP) was investigated with thermoplastic adhesive layers including SiC, which is able to heat by HF irradiation. The influences of SiC particle size and content on the dielectric properties of an adhesive layer were investigated experimentally. The influence of temperature on the tan  δ / e ′ value was also investigated. In the HF Welding process of GF/PP bonded with the thermoplastic adhesive layer, the effects of SiC content and particle size on the Welding properties were examined. The GF/PP was completely welded in a short time when SiC with small particle size and high content was included in the adhesive and a good bond strength was also achieved. Thus, short time and high bond strength for the Welding were achieved with the method using a thermoplastic adhesive layer with high tan  δ / e ′ value.

Jeanlouis Laurent - One of the best experts on this subject based on the ideXlab platform.

  • high frequency Welding of an industrial thermoplastic polyurethane elastomer coated fabric
    Polymer, 1998
    Co-Authors: Stephanie Hollande, Jeanlouis Laurent
    Abstract:

    Abstract The high frequency (27.12 MHz) weldability of a thermoplastic polyurethane elastomer coated fabric was investigated after determination of its dielectric properties. It was shown that at 27.12 MHz, maximum heating occurred at 50°C. Subsequent tests were thus carried out at this temperature. Temperature needs to be measured continuously during the Welding operation as the integrity of the weld depends on the core temperature. Since conventional methods using probes or adhesive indicator strips are disrupted by high frequency (HF) radiation, the integrity of the weld obtained by HF was compared to that obtained by impulse Welding at a given temperature under the same conditions of pressure with the same peeling performance and with the same temperature variation after Welding, measured by the i.r. thermometer. The highest peeling forces were found when the Welding temperature exceeded that of the melting point (180°C) of the hard segments in the polymer. The interactions occurring during Welding were found to depend on the temperature. At temperatures below 180°C, the peeling resistance only derived from entanglements of flexible segments at the interface between the two TPU-coated fabrics. At temperatures of 180°C and above, melting and mixing of hard segments produced total cohesion of the two coated fabrics resulting in an enhanced peeling force.

Yang Leekung - One of the best experts on this subject based on the ideXlab platform.

  • process for the preparation of polyolefin elastomer artificial leather and the products thereof
    2007
    Co-Authors: Yang Leekung
    Abstract:

    The present invention provides a method for preparation of polyolefin elastomer artificial leather by calendering, and the artificial leather made thereof. The high frequency Welding property as well as surface bonding property of the products are improved by incorporating functional improvers. Polyolefin elastomer is selected as the base material, incorporated with lubricant composition and blowing agent composition. The compound is gelled and a sheet is formed by a calender, then the sheet is laminated with a back web which is pre-coated with adhesive. The pre-formed leather is taken into a foaming oven so as to produce an elastic product. In addition, functional copolymers are also used to improve high frequency Welding processability and adhesion to other materials.

S Horvat-varga - One of the best experts on this subject based on the ideXlab platform.

  • Analysis of High-Frequency Artificial Leather Welding as a Function of Seam Quality
    Fibres & Textiles in Eastern Europe, 2011
    Co-Authors: Darko Ujević, Stana Kovačević, S Horvat-varga
    Abstract:

    The basic properties of the High-Frequency Welding of garment pieces are presented. The impact of artificial leather properties on the quality and strength of High-Frequency Welding was explored. The weld quality and strength of different artificial leather samples were optimised by regulating the temperature, power and duration of Welding. Based on the results obtained, it may be claimed that parameter changes in the Welding process, as well as changes in the technological process of manufacturing artificial leather, in the raw material composition, coating component portions and colour of the polyurethane coat (PU) directly affect the quality, strength and water impermeability of the seam.