氣體反壓對流體輔助射出成型品中空率的影響

高啓鴻

doi:10.6840/cycu201800103

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气体反压对流体辅助射出成型品中空率的影响

Effect of Gas Counter Pressure on the Hollow Ratio of Fluid Assisted Injection Molding Process

高啓鸿 , 博士　　导师：锺文仁　　

繁体中文 DOI： 10.6840/cycu201800103

可视化模具；气体反压；喷泉流；气体辅助成型；穿透长度；掏空率； visual mold ； gas counter pressure ； fountain flow effect ； gas assisted injection molding ； penetration length ； hollow rate

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摘要 │ 参考文献 (52) │ 国际计量

摘要〈TOP〉

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This study utilizes transparent PS as the filling material for the experiment to observe the results. The first study uses gas counter pressure technique to inhibit the fountain flow effect and employs a visualized mold design to observe the influence of counter pressure on melt flow behavior, in order to discuss the impact of the counter pressure mechanism on the fountain flow effect. The second study uses the counter pressure in gas assisted injection molding. The molded product is cut in the vertical direction with  melt flow; the gas penetration length and the gas hollow area are measured. The effect of counter pressure on the hollow rate of the gas assisted molded product is concluded from the experimental results. With the visualized mold design, a high-speed camera observes the inhibitory effect of different bar of counter pressures.
In the first study the flow trajectory of particles in the melt is observed and tracked, and the findings showing that the closer the flow line of the melt is to the mold wall, the shorter the offset distance will be for the outward flip. Moreover, the closer to the center it is, the longer the offset distance of the outward flip; meaning it flips outward in the melt-front nearby the center line and stays on the mold wall surface to form a new frozen layer. The melt-front length changes under different counter pressures and different mold temperatures. The front length changes present the inhibitory effect of counter pressure on the fountain flow effect, which is more apparent at the far gate than at the near gate, and the thicker the frozen layer is, the more apparent the fountain effect is.
The results show that when the counter pressure is fixed, the higher the gas assisted pressure is, the shorter is the gas penetration length, the larger is the gas hollow area, and the better is the primary penetration uniformity. When the gas assisted pressure is fixed, the higher the counter pressure is, the longer is the gas penetration length, the smaller is the gas hollow area, and the relatively poor is the primary penetration uniformity. If the difference between the gas assisted pressure and counter pressure is fixed, then as the gas assisted and counter pressures increase, the gas penetration length increases and the hollow area decreases. The larger the difference is between the gas assisted pressure and counter pressure, the shorter is the gas penetration length, the larger is the hollow area, and the better is the primary penetration uniformity. The effect of counter pressure and gas assisted pressure on the penetration length and hollow area of gas assisted molding is observed in the visual mold. The result shows that the counter pressure can inhibit the gas penetration rate. To sum up the above experimental results, the counter pressure can be effectively used to control the gas penetration length and hollow rate of the molded product, so that the molded product quality of gas assisted molding can be upgrade and be more stable.

参考文献 ( 52 ) 〈TOP〉

1. Rose, W., 1961, "Fluid-Fluid Interfaces in Steady Motion," Nature, 191, pp. 242-243.
连结：
2. Yokoi, H., 2002, "Visualization Analysis of Front Behavior during Filling Process of Injection Mold Cavity by Two-Axis Tracking System," Journal of Materials Processing Technology, 130-131, pp. 328-333.
连结：
3. Yang, W. M. and Yokoi, H., 2003, " Visual Analysis of the Flow Behavior of Core Material in a Fork Portion of Plastic Sandwich Injection Molding," Polymer Testing, 22(1), pp. 37-43.
连结：
4. Kanetoh, Y. and Yokoi, H., 2012, "Visualization Analysis of Resin Flow Behavior around a Flow Front Using a Rotary Runner Exchange System," International Polymer Processing, 27(3), pp. 310-317.
连结：
7. Guergov, M. G., et al., 1998, United States Patent 5716561.
连结：

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引用含有DOI的文献

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DOI可强化引用精确性、增强学术圈连结，并给予使用者跨平台的良好使用经验，目前在全世界已有超过五千万个对象申请DOI。如想对DOI的使用与概念有进一步了解，请参考（）。