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https://hdl.handle.net/1822/90248
Título: | New insights on the layer uniformity of multilayered films produced by coextrusion with interfacial surface generators |
Autor(es): | Martins, Marcelo Matos Javadi, Sara Covas, J. A. Carneiro, O. S. Nóbrega, J. M. |
Palavras-chave: | Coextrusion Inelastic fluid Interfacial surface generators Layer uniformity Multilayer OpenFOAM® |
Data: | Fev-2024 |
Editora: | Wiley |
Revista: | Polymer Engineering and Science |
Citação: | Martins, M. M., Javadi, S., Covas, J. A., Carneiro, O. S., & Nóbrega, J. M. (2023, December 7). New insights on the layer uniformity of multilayered films produced by coextrusion with interfacial surface generators. Polymer Engineering & Science. Wiley. http://doi.org/10.1002/pen.26576 |
Resumo(s): | Polymer coextrusion is a manufacturing process whereby at least two polymer melts feed a die to form an extrudate made up of different layers, typically up to 12, to achieve a better product performance. Extruded films with hundreds or thousands of layers can be produced by using sequences of layer multipliers, also known as interfacial surface generators (ISG), at the die inlet. Each ISG splits, stacks, and merges the flow by means of various geometrical channel transformations (GT), in such a way that the number of layers at the outlet is doubled. However, in practice, the thicknesses of the individual layers generated after each transformation are often non-uniform. This work deals with the numerical simulation of multilayer co-extrusion of Newtonian polymer melts, aiming at providing new insights on the influence of the ISG geometry on the layer uniformity. It was found that depending on the combination of GT taking place, uneven layers may form due to the development of unsymmetrical velocity profiles along the direction perpendicular to the fluid interface. From this information, improved ISG dies, capable of producing coextruded films with uniform layer distribution, are proposed and assessed numerically. Highlights: The polymer coextrusion process produces multilayer products. Extruded films can be produced using Interfacial surface generators (ISG). Polymers flow through ISG by several channel geometric transformations (GTs). Polymer melts flow through ISG undergoing various channel geometric transformations (GTs). Non-uniform layers can be generated in the ISG. ISG performance can be improved when GTs are thoughtfully combined. |
Tipo: | Artigo |
URI: | https://hdl.handle.net/1822/90248 |
DOI: | 10.1002/pen.26576 |
ISSN: | 0032-3888 |
e-ISSN: | 1548-2634 |
Versão da editora: | https://4spepublications.onlinelibrary.wiley.com/doi/full/10.1002/pen.26576 |
Arbitragem científica: | yes |
Acesso: | Acesso restrito autor |
Aparece nas coleções: | IPC - Artigos em revistas científicas internacionais com arbitragem |
Ficheiros deste registo:
Ficheiro | Descrição | Tamanho | Formato | |
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AI82_DieDesign.pdf Acesso restrito! | 845,24 kB | Adobe PDF | Ver/Abrir |