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    Optimization of Degradable Polylactic Acid-Based Coating Materials for Sustainable Wire Manufacturing Injection Process Using Computational Fluid Dynamics Analysis
    (2025-06-01)
    Nabudda, Kriengkrai
    ;
    Promjariyakoon, Rattanaporn
    ;
    Kitprathaung, Nustha
    ;
    Ritthong, Wirote
    ;
    Intasonti, Sontinan
    This study investigates the impact of injection angle on polylactic acid (PLA) wire coating performance, focusing on flow dynamics, heat transfer, mass density, and pressure distribution. Three angles: 30°, 45°, and 60° were assessed for their effects on coating characteristics. At 30°, the flow is smooth with minimal turbulence, ensuring consistent deposition. The 60° angle increases velocity and material penetration but risks turbulence and uneven coating. The 45° angle optimally balances material mixing and flow stability. In terms of heat transfer, the 30° angle concentrates heat near the injection point, creating a steep thermal gradient, while the 60° angle disperses heat more broadly but with lower intensity. The 45° angle ensures uniform heat distribution, improving energy efficiency. Regarding mass density, the 30° angle favours localized deposition, ideal for concentrated applications, while the 60° angle promotes broader distribution with reduced concentration. The 45° angle optimises density uniformity and maintains structural integrity. Pressure distribution follows similar trends, with 30° and 60° angles causing uneven deposition, whereas the 45° angle ensures balanced pressure distribution. In conclusion, the 45° angle offers superior performance across all parameters, providing an optimal balance of efficiency, uniformity, and structural integrity, thus enhancing PLA wire coating quality for sustainable engineering applications.
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    Fringe Field Assisted Electrostatic Discharge in Polypropylene Manufacturing
    (2020-03-01)
    Charoensorn, Panudda
    ;
    Srisonphan, Siwapon
    ;
    Kanokbannakorn, Weerawoot
    ;
    Kasemsuwan, Varakorn
    Polypropylene (PP) is an electrical insulation material, and it can store electrostatic charge easily once they have friction with the metal or rubber rollers. Herein we present electrostatic issues in non-woven fabric manufacturing based on the roll to roll production processes. By using portable electrostatic-field meter measurements, we provide a low-cost and highly effective solution for discharging electrostatic charge before exposed or in contact with the operators, and we also identify where to install charge-dissipation technology to make it most useful. We employed the benefit of a highly and localized fringe field to discharge the electrostatic charge along the edge of the grounded metal rod placed at ~30 cm away. After placing the metal rod, the average of electrostatic potential of winding stock roll during spinning is decreased ~10 times, corresponding to ~0.2 μc/m<sup>3</sup> accumulated electrostatic charge on synthetic fabrics. The electric field distribution via the finite element method was illustrated corresponding to the reduction of electrostatic charge distribution in PP winding stock roll before and after inserting the grounded metal rod.
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    The state of the art for dissolved gas analysis based on interpretation techniques
    (2016-11-28)
    Wattakapaiboon, W.
    ;
    Pattanadech, N.
    Dissolved gas analysis (DGA) is an important method and widely used for assessment the conditions of transformer insulations. The dissolved gases interpretation is one of the most significant procedures to identify the failure causes and/or degree of insulation degradation. The aim of this paper is to represent the performance of various DGA test result interpretation techniques i.e. Doernenburg Ratio, Roger Ratio, IEC Ratio, MSS ratio, Duval Triangle and Duval Pentagon. Fifty six fault cases occurring in transformers obtained from IEC TC 10 database were employed to evaluate the performance of the DGA interpretation techniques. It was found that the Duval triangle method provided the most accuracy DGA interpretation compared with other methods. However, some engineering points of view for evaluation the performance of DGA interpretation techniques for examples normal ageing insulation condition, correct and incorrect fault case identification, and unclear fault case identification including no identification of the fault cases have to be taken into account. Therefore, the performance of the Duval triangle method may be reduced while that of Duval Pentagon may be increased when such parameters are considered.