Plastic Flow LLC, Houghton, Mich., a spin-off from Michigan Tech University, released polyXtrue software last summer to simulate monolayer die flow. It has now introduced a coextrusion version with a new algorithm for mesh partitioning that reportedly can predict layer interface behavior, including changes in layer shape, without having to recalculate the original finite-element mesh. This makes it both accurate and very fast, says president and software developer Mahesh Gupta, who presented a paper on the new mesh partitioning at the SPE ANTEC in Milwaukee last May. He says most coex die simulations can be completed in under an hour. The key is that a changing boundary between two layers passes through the inside of the original tetrahedral mesh, creating partitions into new finite-element shapes, but without altering the original finite elements. Plastic Flow offers polyXtrue software for license and also offers die-design services. The software is applicable to virtually all die types, including pipe, profile, sheet, and cast and blown film. (906) 483-0691 • www.plasticflow.com
Editor PickSizing the Barrier Gap
Here’s a less complex way to properly size the barrier gap for barrier screws.