Graphing Injection Pressure: What Should Pack & Hold Curves Show?

摘要

In my May 2019 column I prodded you to get the injection pressure vs.time graph working on your injection molding machines.Plotting injection pressure vs.time is a great way to capture your process and learn how your machine and controller operate.But there are times when the result is But there are times when the result is not what you'd expect.While this injection-pressure graph varies for different processes,there also are similarities.That is,curves will not look exactly the same for all processes,but should be similar in basic aspects.In this column I'll focus on pack and hold,also known as second stage.