Know How - Injection Molding

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Published: 8/1/2018

Injection Molding: Fill Based on Volume, Not Weight
Most parts should be 90-99% full after first-stage—by volume not weight. Here’s why that’s important and how to make a first-stage-only part.

Published: 7/1/2018

Injection Molding: Safety First—Know the Compatibility of Different Resins
Certain materials don’t play well together when mixed. So it’s best not to. Here are some guidelines.

Published: 6/1/2018

Injection Molding: Process Documentation Is Crucial to Making ‘Identical’ Parts
Use a machine/mold setup sheet to document plastic parameters and use them on any acceptable machine into which the mold is placed.

Published: 4/27/2018

Injection Molding: A Practical Approach to Calculating Residence Time
Toss the formulas. The best way to determine residence time is to conduct a simple experiment.

Published: 3/29/2018

Injection Molding: How Backpressure Adjustments Influence Shot Size
Raising backpressure results in increasing shot size, which can cause a host of other problems.

Published: 3/1/2018

Injection Molding: How to Set Barrel Zone Temps
Start by picking a target melt temperature, and double-check data sheets for the resin supplier’s recommendations. Now for the rest...

Published: 1/23/2018

Injection Molding: Melting Amorphous vs. Semi-Crystalline Plastics
Understanding the differences in how each melts is crucial to obtaining melt uniformity.

Published: 1/2/2018

Injection Molding: Nozzle Heaters & Thermocouples: A Case of Wiring Done Wrong
Incorrect placement of wires for these components frustrates molders and costs them money to boot.

Published: 10/27/2017

Injection Molding: No, Backpressure Does NOT Raise Melt Temperature
It’s a classic confusion between cause and effect. Melt temperature rises when screw speed is increased. Check out this data.

Published: 9/25/2017

Injection Molding: DOEs Done Right
Doing DOEs for the sake of doing them wastes time and money. But they can provide vital information to determine which process variable is determining a critical part characteristic.