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 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...

Tip of the Day 175: Full Integrals vs. Fill and Pack Integral

In Tip #174 you saw how Fill and Pack Integral could be useful for monitoring dimensions in very thin-wall, fast freezing parts. In that discussion we used End of Cavity as the indicator, assuming that the dimension near the end of the cavity was most important.A...

Tip of the Day 174: Wherefore “Fill and Pack Integral”?

We have recently seen several customers using the eDART™ summary value “Fill and Pack Integral” for a part quality alarm. This value and “Fill and Pack Time” are most used for thin-wall molding quality alarms. We do not recommend using these for modest aspect ratio or...