A New Method to Reduce the Risk of Jetting

摘要

Jetting is a very common problem when molding PIM feedstocks. The high viscosity, the high density and the low compressibility are the sources for this problem.A common method is to inject against a core, but sometimes part geometry does not allow this. Alternatively a new method the universal coining procedure can sometimes be applied. When doing universal coining a core is moved forward, and when the feedstock is injected, the injection pressure pushes the core back to the original position. Important is to have a repeatable counter pressure. Parts manufactured with and without universal coining will be shown. Fill studies and material data will prove the effectiveness of the universal coining.