Resin Molding and Rheology Lesson 7: Basics of Die Swell and Dimensionless Numbers
Introducing calculation formulas under specific conditions! Examples of applying De numbers to natural phenomena are also explained.
The molten state of polymers such as plastics exhibits elastic properties during flow, and it is particularly known to swell due to elastic recovery when extruded from the die exit. This phenomenon is referred to as Die Swell or the Barus effect. In practice, the cooling of the resin after exiting the die and the influence of gravity come into play, but this column will introduce a calculation formula under very limited conditions. 【Contents (partial)】 ■ Assumptions ■ Dimensionless numbers of viscoelastic fluids and Die Swell ■ Weissenberg number: We ■ Deborah number: De ■ Calculation examples *For detailed content of the column, please refer to the related links. For more information, feel free to contact us.
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