Know How - Injection Molding

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Published: 1/4/2011

Injection Molding: Understanding Pressure Loss In Injection Molding
One of the more prominent trends in processing is the need for higher plastic pressures to mold parts.

Published: 1/1/2020

Revisiting Shot Size vs. Barrel Capacity
We’ve covered this topic before, but it’s important enough to warrant another look..

Published: 12/1/2019

How Can Molders Achieve Effective Process Monitoring?
You have developed a proper process; now you need to monitor that process to ensure its stability through a run.

Published: 11/1/2019

Checking and Controlling Nozzle Body Temperature
Temperature control is critical from feedthroat to nozzle tip. Yet despite advances in machinery, this continues to be an issue for molders. Here’s what to do about it.

Published: 10/1/2019

V-to-P Ramp Time and Over-Travel
Many injection machines use ramp time to control the transition from injection pressure to hold pressure and reduce over-travel. Do you know how to set yours?

Published: 9/1/2019

Graphing Injection Pressure: What Should Pack & Hold Curves Show?
Are you sure your press is doing what you want? Visit your controller often to ensure your machines plot the pressure vs. time graph for all your processes. Here let’s focus on pack and hold.

Published: 8/1/2019

Understanding—and Using—Decompression to Your Advantage
Decompression—aka suckback—is a very important setting on an injection molding machine. On today’s machines, molders typically get the option to set decompression before and after screw rotation/recovery. Are they using this featur...

Published: 7/1/2019

How to Deal With Residual Stress in Molded Parts
Here are design, molding, and fixturing considerations to help you handle this unavoidable issue.

Published: 6/1/2019

How to Manage Pressure Loss in Injection Molding
Achieving a process window wide enough to ensure consistent part quality depends on achieving sufficient pressure at end of fill.

Published: 5/1/2019

How to Quickly Verify Your Machine & Process Setpoints
For a quick check of your process setup, the injection-pressure-vs.-time graph is your best tool.