Explaining Viscosity In Layman’s Terms

I just received this blog request… AK I just read your past blog on crystallinity, could you briefly provide a layman’s description of viscosity? My Response Basically, viscosity is a measure of a polymer’s resistance to flow. The higher the viscosity, the higher the polymer’s resistance to flow. For example: Honey has a higher resistance to flow […]

Foaming Agents in High Pressure Molding…

A past student of mine recently posed this question regarding an aspect of injection molding which is not commonly discussed… SE I was wondering if you help me locate some references on Processing HDPE and PP with 1% chemical foaming agent? All the information I find focuses on Structural Foam which is a low pressure process. We primarily use high pressure […]

Acceptable Part Weight Variability

Yesterday, I received a question which focuses on the common issue of variability… Nathan Currently we are running a mold (8 cavity) with TPU Estane material with part weight 2.68gms.(Holding time – 5.5sec) Based on the Part 2D drawings the theoretical part weight calculated from 3D Solid works is 2.71 gms. From the gate freeze […]

Adjusting Hot Runner Systems…

I received this question the other day… Milan When I am setting up a process with a hot runner system, I always have to adjust the hot runner nozzles to avoid unbalanced parts. Do you know of any techniques to help eliminate this problem? My Response Although adjusting the temperature of your hot runner drops can help balance your tool, […]