Abstract
For the melt extrusion process of a multi-layer film, it is well known that the encapsulation phenomena appears in the die and each layer thickness changes in the width direction due to the difference of rheological properties for each layered polymer. This process has been numerically analyzed by the finite element method with moving interface elements, but the failure of re-meshing occurred because of large deformation of mesh resulting from large deformation of interface. We developed the new analysis technique using a fixed mesh independent of interface change in the iterative calculation scheme and applied for the multi-layer flow in the die. As a result, we obtained successful solution when a sufficient resolution with a fixed mesh was employed.
