Design equation for the lip opening of a film extrusion die
Abstract (Summary)This research is focused on modeling the manufacturing process for DuPont Teflon® Film. In particular, the design of the manufacturing die with respect to the die lip opening is most important. Therefore, the equation for the die lip opening of an end-fed plastic extrusion die was derived, using Newtonian fluid and Power-Law fluid assumptions. This equation was compared to the lip opening of an actual manufacturing die used for commercial production of DuPont Teflon® Film. The theoretical results were consistent to the actual lip opening range. To extend the usefulness of this equation, it was derived using two approaches, one that includes pressure and flow rate terms and one that only includes geometric and material parameters. The first is useful for process design while the later is useful for setting the die lip opening. The later version of the equation illustrated the relationship between the minimum die lip opening and the maximum die lip opening which is only dependent on geometric parameters and the power law index. As an example of the use of the equation, the maximum lip opening versus the minimum lip opening was plotted for varying power law indexes. From this chart, the die lip opening can be quickly determined.
School:The Ohio State University
School Location:USA - Ohio
Source Type:Master's Thesis
Keywords:die lip opening
Date of Publication:01/01/2008