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| 通过POLYFLOW软件对粘弹性高分子熔体在气体辅助挤出口模内的流动进行了研究，模拟结果表明熔体在滑移段的平均停留时间与材料松弛时间之比（t/s ）与挤出胀大比B之间存在指数衰减关系 。对气辅挤出过程的机理分析表明熔体在滑移段的流动实质上处于应力松弛过程，其变形值可用蠕变方程描述 。最后通过气辅挤出成型试验，HDPE在三种螺杆转速及三种挤出温度下挤出物直径的实验值与计算值达到很好的吻合。数值模拟、机理分析、实验验证达到高度一致性，表明该方程具有很好的合理性，可用于指导气辅口模设计。 |
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redwang8181
至尊木虫 (职业作家)
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gyf3100003007(金币+4,VIP+0):多谢
gyf3100003007(金币+4,VIP+0):多谢
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The study of the flow for the viscoelastic macromolecule melt in the gas-assisted extrusion meatus through POLYFLOW software shows that there is a kind of exponential decay relationship between the ratio of the average time that macromolecule melt settled in the slippage section and material’s relaxation time (t / s) and the ratio(B) of the extrusive inflation. The analysis of the mechanism for the process of gas-assisted shows that the flow of the macromolecule melt in the slippage section is the process of the stress relaxation in essence, the deformation value of which can be described with creep equation. Finally, through the test of gas-assisted extrusion moulding, the HDPE’s diameter of the experimental data with the calculated value achieved a good match in the three screw rotate speed and the three kinds of extrusion temperature. The numerical simulation, the analysis of mechanism and experimental verification reach a high degree of consistency, which shows the equation is reasonably good and can be used to guide the design of gas-assisted meatus. |
2楼2008-09-29 10:13:19
redwang8181
至尊木虫 (职业作家)
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3楼2008-09-29 10:13:44
DifficultFlying
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gyf3100003007(金币+4,VIP+0):多谢
gyf3100003007(金币+4,VIP+0):多谢
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在2楼的基础上，修改了一下，不知道效果如何？ The flow of the viscoelastic macromolecule melt in the gas-assisted extrusion meatus was investigated by using POLYFLOW software. The simulation results show that the relation of the ratio of the average time that macromolecule melt settled in the slippage stage to material’s relaxation time (t / s) with the ratio(B) of the extrusive inflation decayed exponentially . The mechanism analysis of the gas-assisted process shows that the flow of the macromolecule melt in the slippage stage is a stress relaxation process in essence, the deformation value of which can be described by creep equations. Furthermore, by the moulding experiment of gas-assisted extrusion, the experimental HDPE’s diameter agree well with the calculated value in the three screw rotate speed and the three kinds of extrusion temperature. The high degree of consistency among the numerical simulation, the analysis of mechanism and experimental verification, shows that the proposed equation is reseable and relible to guide the design of gas-assisted meatus. |
4楼2008-09-29 16:16:06