• 作者： 陳夏宗; 鄭銘章; 徐國福; 許可昇
• 作者服務機構： 中原大學機械系; 中央大學機械系
• 中文摘要： 本研究係藉由實驗和模擬來探討在氣體輔助射出成型中熔態高分子與氣體流動的特性。首先量測皮層烙膠厚度延著氣體流動方向的分佈，並區分出主要氣體穿透與次要氣體穿透。基本上，主要穿透區皮層熔膠厚度相當均勻而且隨壓力增加而減少。當壓力到達臨界值時，皮層厚度則變成定值。皮層烙膠厚度並隨著料溫、模溫的降低而增高。在主要穿透氣體波前區皮層熔膠厚度呈現二種變化的特性。本研究並使用雙充填參數配合控制體積／有限元素法來預測熔膠與氣體波前的運動。模擬的預測與實驗結果相當吻合。
• 英文摘要： A characteristic study concerning gas and polymer melt flow during gas-assisted injection moldingof the spiral tubes was conducted through simulations and experiments. The distribution of the skin meltthickness along the gas flow direction was measured, and gas penetration in the primary and secondarystages was identified. It was found that the coating melt thickness which decreased with increasing gaspressure was rather uniformly distributed behind the gas front. When the gas pressure reached a criticalvalue, the thickness of the coating melt became constant. The thickness of the coating melt also increasedwith decreasing melt temperature and mold temperature. Near the gas front, the coating melt thicknessvaried significantly, and the variation showed two characteristics. An algorithm based on the control-volume/finite-element method combined with a particle-tracing scheme using the dual-filling-parametertechnique is utilized to predict the advancement of both the melt front and gas front during the moldingprocess. The simulated distribution of gas penetration shows reasonably good agreement with theexperimental observations.
• 中文關鍵字： gas-assisted injection; gas penetration; coating melt; dual filling parameter
• 英文關鍵字： --