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From the simulation, an equation about the die swell ratio was proposed which can be successfully applied to the design of GAE die, relating the average residence time of melt in slip part and relaxation time. Certain constants arising from the equation were shown to be interrelated or correlated with deformation factor for purely-viscous component. The validity of the equation and the possibility of more general application can be used in die design of GAE.

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[ Last edited by xjh2672 on 2008-2-17 at 13:42 ]
2Â¥2008-02-17 13:33:58
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According to the research ,the residence time of melt in its slipping section has a relation of exponential decay  with its  relaxation time ratio and extrusion swell  ratio.Its mathematical relation  can be expressed by  this equation  B=1+Ae-t/r£¨A¡Ö0.2~0.8£©.In fact ,melt in the slipping section is in the process of deformation decay.Theoretical analysis and numerical simulation match  well,so the equation can be used as a  guidence in the design of gas-assisted dies
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3Â¥2008-02-19 14:56:17
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