Simulate Coex Layer Instability

Compuplast North America, Mississauga, Ont., is about to introduce what it says is the first commercial simulation software that automatically analyzes coex film, sheet, or pipe dies for potential interfacial instability based on die geometry and material flow properties.

Compuplast North America, Mississauga, Ont., is about to introduce what it says is the first commercial simulation software that automatically analyzes coex film, sheet, or pipe dies for potential interfacial instability based on die geometry and material flow properties. Wave-type instability is related to viscosity and elongational properties of resins in adjacent layers at the point where they merge in the die. Zigzag instability occurs at the exit of the die where stress and speed are high. A beta version of Interfacial Instability Analysis was exhibited at the recent International Plastics Fair in Tokyo and the commercial release will be at NPE in Chicago next June. It will be an option in Compuplast’s 2D FEM module, which is part of its Virtual Extrusion Laboratory suite of software.