Know How - Injection Molding

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Published: 8/25/2014

INJECTION MOLDING: The Importance of Nominal Wall For Lightweighting Molded Parts
Establishing a nominal wall is one of the most important decisions an engineer makes when designing parts. Understanding how design changes will impact the manufacturing process is critical to ensure the part performs as expected.

Published: 7/28/2014

INJECTION MOLDING: Are Your Sprue or Parts Sticking? Here Are Some Solutions
Nine times out of 10 when a sprue or part sticks, the result of trying to unstick it is more scratches or undercuts, making the problem worse and the fix more costly. Here’s how to set up a proper procedure for this sticky wicket.

Published: 6/19/2014

INJECTION MOLDING: Setting Mold Protection Takes Time But Saves More
Mold protection is often neglected, but it more than pays for the time and attention required.

Published: 5/21/2014

INJECTION MOLDING: Troubleshooting Bridging
Bridging is an aggravating problem that can shut you down. Here's how to find it and fix it.

Published: 4/23/2014

INJECTION MOLDING: ‘Know Your Machine’
Many molders think they “know their machine,” but in reality do not. They get consumed by the demands of day-to-day production requirements and lose sight of the big picture.

Published: 3/21/2014

Screw Speed Versus Recovery Time
Many molders don't take screw-rotation speed into account when developing a process for a new mold. Here's why they should.

Published: 2/25/2014

Shutting Down & Starting Up An Injection Molding Machine
Whether your press is going down for repairs, a holiday, or a slow production schedule, proper shut-down and start-up procedures must be followed.

Published: 2/25/2014

Melt Flow Rate Testing–Part 8
Here are the steps to take in cases where the MFR is not provided by the polymer supplier.

Published: 1/23/2014

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: 12/29/2013

How to Establish an Acceptable Range for Pressure at Transfer
Pressure at transfer tells you the viscosity of the resin, providing the fill time is the same. Monitoring pressure at transfer—or better yet, the integral under the pressure vs. time curve—provides insight into the process.