Know How - Injection Molding

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Published: 7/30/2012

Nozzle Leaks: Why They Occur, How to Detect & Fix Them
Nozzle leaks are a serious problem in injection molding. Here are some causes and remedies.

Published: 6/26/2012

Should You Profile Injection Velocity?
If you can get by with one velocity, use only one, because fill time is easier to reproduce, and it is easier to set up the process.

Published: 5/29/2012

Understanding Polymer Flow: Interpreting the Viscosity Curve
Take the time to do the viscosity curve on new molds. You will learn more in that hour than many learn in years about the process for this tool.

Published: 4/26/2012

All About ‘Cushion’
What it means. Why it's important.

Published: 3/26/2012

Getting Good Data from DOE
How do you know what process variables control a part’s dimensions or other properties? A properly conducted DOE is the answer—but incorrect procedure will yield useless data.

Published: 2/21/2012

Improve Profits by Graphing Injection Pressure
Graphing is a powerful aid in optimizing the process and troubleshooting both process and machine issues.

Published: 1/28/2012

What to Calibrate on Your Press
There are different approaches to meeting the goal of making parts identically. At the heart of all them is the process or the machine setup sheet. My bet would be you cannot find two that are identical.

Published: 12/27/2011

Why Multi-Cavity Molds Fill Unevenly
Balanced filling is critical for making identical parts, achieving high CPKs, holding tight tolerances, and getting “good” data from design of experiments.

Published: 11/28/2011

What Percentage of Barrel Capacity Should Your Shot Size Be?
The answer combines both experience and science, and it may be one of those molding details that gets overlooked but could be stealing a chunk of your profits.

Published: 10/25/2011

Plasticating Rates: Your Profits Are at Stake
To get the best cycle time you need the right machine, and few molders take the time to specify this critical component of the process.