Effect of Polymer Viscosity on Post-Die Extrudate Shape Change in Coextruded Profiles

June 09, 2015 | by PolyXtrue | views 4185

Bi-layer flow in a profile coextrusion die was simulated. Prediction of post-die changes in extrudate profile was included in the simulation. Mesh partitioning technique was used to allow the coextrusion simulation without modifying the finite element mesh in the profile die. Effect of polymer viscosities on the change in profile shape after the polymers leave the die is analyzed. It is found that a difference in the viscosities of the coextruded polymers can lead to a highly non-uniform velocity distribution at die exit. Accordingly, post-die changes in extrudate shape were found to be widely different when the polymers in the two coextruded layers were changed.

---

---

Rheology Plastics Extrusion PolyXtrue Research Papers

About PolyXtrue
All posts by PolyXtrue

Related Posts

Effect of Wall Slip on the Flow in a Flat Die for Sheet Extrusion

Numerical and Experimental Investigation of Elongational Viscosity effects in a Coat-Hanger Die

Elongational Viscosity of LDPEs and Polystyrenes using Entrance Loss Data

Estimation of Elongational Viscosity of Polymers From Entrance Loss data Using Individual parameter Optimization

Estimation of Elongational Viscosity of Polymers for Accurate Prediction of Juncture Losses in Injection Molding