Crystallization from polymer melt is one of the most fundamental phenomena of material phase transformations. The possibility of controlling crystallization kinetics is essential to achieve the proper polymer microstructure and consequently obtain desired material properties, reducing undesired effects such as excessive anisotropy of shrinkage, warpage and insufficient dimensional accuracy. Due to the high transformation rate, the experimental analysis of crystallization is critical. For this reason, it is more convenient to evaluate this phenomenon by using a finite element commercial software under several testing and processing conditions. The work investigates the crystallization evolution in post-filling, mainly induced by thermal gradients, and its effect on the final properties of an injection molding part. The numerical scheme, crystallization models and their implementation into commercial software are described as well as the experimental data for isotactic Polypropylene.
Thermal simulation of polymer crystallization during post-filling / Spina, Roberto; Spekowius, Marcel; Küsters, Klauss; Hopmann, Christian. - STAMPA. - 554-557:(2013), pp. 1699-1706. (Intervento presentato al convegno 16th ESAFORM Conference on Material Forming, ESAFORM 2013 tenutosi a Aveiro, Portugal nel April 22-24, 2013) [10.4028/www.scientific.net/KEM.554-557.1699].
Thermal simulation of polymer crystallization during post-filling
Roberto Spina;
2013-01-01
Abstract
Crystallization from polymer melt is one of the most fundamental phenomena of material phase transformations. The possibility of controlling crystallization kinetics is essential to achieve the proper polymer microstructure and consequently obtain desired material properties, reducing undesired effects such as excessive anisotropy of shrinkage, warpage and insufficient dimensional accuracy. Due to the high transformation rate, the experimental analysis of crystallization is critical. For this reason, it is more convenient to evaluate this phenomenon by using a finite element commercial software under several testing and processing conditions. The work investigates the crystallization evolution in post-filling, mainly induced by thermal gradients, and its effect on the final properties of an injection molding part. The numerical scheme, crystallization models and their implementation into commercial software are described as well as the experimental data for isotactic Polypropylene.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
