Know How - Injection Molding

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Published: 7/1/2015

INJECTION MOLDING: How to Specify an Injection Molding Machine
In part two of a three-part series, the focus is on the injection unit.

Published: 5/25/2015

INJECTION MOLDING: How to Specify an Injection Molding Machine
With the market percolating, more molders are looking at new presses. This series will discuss what you should consider before writing a check, beginning with the clamping unit.

Published: 4/27/2015

INJECTION MOLDING: Scientific Molding Gone Wrong
Sometimes molders get trained in Scientific Molding only to revert to their old way of doing things as soon problems pop up.

Published: 3/31/2015

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.

Published: 2/22/2015

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.

Published: 1/27/2015

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

Published: 1/20/2015

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.

Published: 12/29/2014

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?

Published: 11/24/2014

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.

Published: 10/23/2014

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.