It happens more than most molders realize and can cause a host of molding problems. Here’s what to look for and how to fix it.


How much screw ‘jumping’ or bounce-back can your process tolerate? The answer is no surprise: It depends

Injection Molding: How to Get Rid of Bubbles

First find out if they are the result of trapped gas or a vacuum void. Then follow these steps to get rid of them.


Find practical hands-on solutions to common processing problems tips and techniques.

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Injection Molding: How to Get Rid of Bubbles
First find out if they are the result of trapped gas or a vacuum void. Then follow these steps to get rid of them.
Columns Published: 3/31/2015

INJECTION MOLDING: The Trouble with Mismatched Nozzle Tips & Sprue Bushings
It happens more than most molders realize and can cause a host of molding problems. Here’s what to look for and how to fix it.
Columns Published: 2/22/2015

INJECTION: First to Second Stage Transfer: Should There Be ‘Bounce-Back’?
How much screw ‘jumping’ or bounce-back can your process tolerate? The answer is no surprise: It depends
Columns Published: 1/27/2015

Injection Molding Know How, Live
Upcoming training by Plastics Technology's Injection Molding Know How columnist, John Bozzelli, will walk injection molders through new tool process development via scientific molding.
Blog Published: 1/20/2015

INJECTION MOLDING: Another Way to Deal with Regrind
You can run into a lot of problems molding parts from a blend of regrind and virgin material. Might you be better off using 100% regrind?
Columns Published: 12/29/2014

High-Pressure Water: A New Concept for Screw Cleaning
Everyone in a molding plant is on the same page for screw cleaning: Avoid pulling it until there is no alternative. Here are ways for dealing with the inevitable, including an altogether new technique.
Columns Published: 11/24/2014

INJECTION MOLDING: How to Tell If Your Non-Return Valve Is Leaking
Check valves are potentially troublesome devices. Here’s how to find out if yours is behaving properly.
Columns Published: 10/23/2014


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