Prediction and experimental verification of bubble and processing characteristics in blown‐film extrusion |
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| Authors: | Khokan Kanti Majumder Yan Ding Graham Hobbs Sati N Bhattacharya |
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| Affiliation: | 1. Rheology and Materials Processing Centre, RMIT University, 124 Latrobe Street, Melbourne, Victoria 3000, Australia;2. School of Mathematical and Geospatial Sciences, RMIT University, 124 Latrobe Street, Melbourne, Victoria 3000, Australia;3. AMCOR Research and Technology, RMIT University, 124 Latrobe Street, Melbourne, Victoria 3000, Australia |
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| Abstract: | Blown‐film modeling is useful to the flexible packaging industry for predicting process and bubble characteristics, such as freeze line height (FLH), bubble diameter, and film thickness. The use of a suitable rheological equation to describe material properties is critical in simulating the blown‐film process. In this article, we present an improved rheological constitutive equation, which incorporates more realistic parameters of stress and deformation properties of the materials by combining the Hookean model with the Phan‐Thien Tanner (PTT) model. The proposed PTT–Hookean model is aimed at enhancing the viscoelastic behavior of the melt during biaxial stretching in the blown‐film extrusion. Predictions of the blown‐film bubble characteristics and FLH obtained with the PTT–Hookean model agreed well with the experimental data of this study and previous studies with different materials and different die geometries. The justification for combining the Hookean model with the PTT model in the blown‐film process is also reported here. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci, 2009 |
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| Keywords: | crystallization extrusion modeling rheology simulations |
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