Tip of the Day 180: Valve Gates and Thick Semi-Crystalline Parts

“You can’t use cavity pressure control of valve gates in semi-crystalline materials.”Or so I was told.I received this advice at NPE 2006. We were running Winzeler Gear’s “Gear Gizmo” mold. This had independent valve gate control in a family tool running Delrin. And we...

Tip of the Day 177: The Molding World in Quadrants

We often risk using a kind of “one size fits all” mode of thinking about plastic processes, their control and quality monitoring. I have found the following diagram useful for separating the different regions in the world of injection molding.(For those who need the...

Tip of the Day 176: Why Use a Percent of Peak for Pack?

In order to calculate good pack numbers† from cavity pressure sensors, the eDART™ must be given the correct information about what “packed” means. In the Sequence Settings you select the sensor location you want to use to determine whether the cavity is packed. Why...