Abstract
Using the developed mathematical model, we performed an analysis of the process of cooling an extruded polymeric film on the drum with inner cooling. Dependence of average and local temperatures of a polypropylene film and the drum’s shell under condition of drum’s settling under stationary thermal mode was studied. It was shown that temperature difference between the surface of the shell and the refrigerant in the drum at film cooling can reach 40–65 °C and higher, which affects intensity of cooling of a polymeric film. With an increase in the minimum thickness of a film and (or) a decrease in its velocity, the influence of drum’s warm-up on the intensity of film cooling increases. Ignoring the drum’s warm-up process can lead to the insufficient cooling of a polymeric film and thus, to a decrease in its quality. The developed mathematical model could be used to analyze the process of cooling of not a film only, but also of other roll polymeric materials, obtained both by extrusive and rolling-calender method.
Highlights
Thermoplastic polymers and plastic masses are mainly processed by extrusion into various products, many of which are flat and sleeve polymeric films for different purposes [1, 2]
One of the techniques of manufacturing flat polymeric films is the method of watering of polymer melt that is exiting form a plane-slot extrusion head on the cooled steel drum, partially immersed in a water bath [3,4,5]
An analysis of publications on the production of flat polymeric films [7,8,9,10,11,12,13,14,15,16,17,18,19,20,21] showed that majority of them are devoted to numerical and experimental modeling of separate stages of their production process
Summary
Thermoplastic polymers and plastic masses are mainly processed by extrusion into various products, many of which are flat and sleeve polymeric films for different purposes [1, 2]. In this case, one of the techniques of manufacturing flat polymeric films is the method of watering of polymer melt that is exiting form a plane-slot extrusion head on the cooled steel drum, partially immersed in a water bath [3,4,5]. That is why a study of the process of processing a polymeric film on the drum taking into consideration its cooling system appears to be relevant
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